HG/T 20542-1992 Technical conditions for masonry of calcium carbide furnace
Some standard content:
Industry Standard of the People's Republic of China
Technical Specification of Lining Laying for Calcium Carbide Furnace
HG20542-92
Editor: Industrial Furnace Design Technology Center of the Ministry of Chemical IndustryApproved by: Chemical Industry
Implementation Date: 1
Engineering Construction Standard Editing Center of the Ministry of Chemical Industry
Standard Search Exchange Network
omAll kinds of standard industry information are free to download
Subject Content and Scope of Application
1.1.1 This standard specifies the technical requirements for the selection of self-baked carbon bricks and their seamless masonry process in the design of calcium carbide furnace lining. 1.1.2 This technical condition is applicable to the masonry of large and medium-sized steel-shell calcium carbide furnaces with self-baked carbon bricks as lining. Small calcium carbide furnaces below (5000kVA) can refer to it for implementation. 1.1.3 The lining of ore-fired furnaces with self-baked carbon bricks, such as ferrosilicon furnaces and crystalline silicon furnaces, can also refer to this technical condition. 1.2 Reference standards
《Industrial furnace masonry engineering construction and acceptance specifications》GBJ211
JB2880
GB6153
GB3417
GB2988
GB2989
GB4415
GB3994
GB3995
《Technical conditions for steel welded atmospheric pressure vessels》
《Self-baked carbon bricks for calcium carbide furnaces》
《Clay bricks for blast furnaces》
《High alumina bricks》
《High alumina bricks for blast furnaces》
《Clay refractory bricks》
《Clay insulating refractory bricks》
《 High alumina insulating refractory bricks》
Construction Standard 11-59
GB3003
YB2808
YB2807
《Asbestos Board》
《Ordinary Alumina Silicate Refractory Fiber》
《Clay Refractory Mud》
《High Alumina Refractory Mud》bzxZ.net
《Fine Joint Paste》
《Coarse Joint Paste》
《High Alumina Cement》
Standard Search Micro Network
2Terms
Seamless masonry process: refers to the construction method of using fine joint paste as masonry material when laying self-baked carbon bricks, and tightening them with dry jacks to make the brick joints between carbon bricks less than or equal to 1mm, and the annular joints less than 1.5mm. Tamping: The process of tamping the rough joint paste to the required volume density by using a pneumatic pick equipped with a special pick head is called tamping. Primary furnace baking: refers to the process of baking the furnace bricks below the self-baked charcoal bricks at the bottom of the furnace and the furnace wall bricks below the bottom edge of the furnace door before laying the self-baked charcoal bricks to discharge the moisture in the masonry. Standard search micro network
osocom3 furnace shell
3.0.1 The manufacture and assembly of the furnace shell must meet the requirements of the design drawings. The relevant provisions of JB2880 "Technical Conditions for Steel Welded Atmospheric Pressure Vessels" should be followed during the manufacturing and welding of the furnace shell. Airtightness should be ensured for closed calcium carbide furnaces. 3.0.2 The on-site assembly of the furnace shell shall meet the following requirements: 3.0.2.1 The I-beam of the furnace bottom must be installed according to the drawings, with a longitudinal horizontal tolerance of 1mm/m, a total length of no more than 5mm, and a transverse horizontal tolerance of no more than 5mm
3.0.2.2 The furnace bottom steel plate must be flat and installed horizontally, with a horizontal tolerance of no more than 2mm/m; the total horizontal tolerance of the entire furnace bottom plate shall not exceed 10mm in both longitudinal and transverse lengths. 3.0.2.3 The diameter tolerance of the furnace shell is 2/1000D (D is the inner diameter of the furnace shell), the straightness of the furnace shell section shall not exceed 2mm/m, and the total straightness shall not exceed 10mm.
3.0.2.4 The difference between the maximum diameter and the minimum diameter of the furnace shell shall not exceed 1%D, and shall not exceed 30mm. Standard Searcher
Free Standard Industry Information
4 Raw Materials
4.1 Acceptance, Storage and Transportation of Materials
The materials used to build the calcium carbide furnace must meet the quality standards required by the design, and the materials must be dry. Waterlogged, damp or frozen materials are not allowed. To this end, the acceptance, storage and transportation of materials should comply with the following requirements: 4.1.1 Refractory materials and products should be accepted, stored and transported in accordance with the current relevant standards and technical conditions. Refractory materials and products transported to the construction site should have a quality certificate. Time-limited refractory materials should indicate their validity period. Whether the brand, grade and brick number of refractory materials and products meet the standards, technical conditions and design requirements should be checked and inspected or selected according to the documents before construction. If necessary, it should be inspected by the laboratory. Materials that may deteriorate or must be inspected twice should be inspected by the laboratory to prove that their quality indicators meet the design requirements before they can be used.
When it is necessary to use the refractory bricks recovered from the dismantling furnace, the mud and slag on the bricks should be removed. The old bricks can be laid in the secondary parts of the calcium carbide furnace after passing the inspection.
4.1.2 When transporting and storing refractory materials, moisture should be prevented. Corundum bricks, high-alumina bricks, carbon products, insulating refractory bricks, insulating products, etc. should be stored in covered warehouses or calcium carbide furnace workshops. Refractory materials must not be damp, and refractory materials that are flooded or damp are not allowed to be used. 4.1.3 Refractory materials stored in the construction site warehouse or calcium carbide furnace workshop should be placed according to brand, grade, brick number and masonry order, and marked.
4.1.4 When self-baked carbon bricks leave the factory, the carbon brick manufacturer should provide a pre-masonry schematic diagram to indicate the number and location of the bricks. The qualified carbon bricks shall be marked with the pre-laid position, number of layers and sequence number with white lead oil or white resin paint, and shall be consistent with the brick number in the pre-laid schematic diagram. The brick number mark is written as follows: the carbon bricks at the bottom of the furnace are written on the side, and the carbon bricks at the annular furnace are written on the end surface facing the furnace, and they are stacked separately according to the masonry order to ensure the quality of the construction and facilitate the construction. 4.1.5 Self-baked carbon bricks shall be transported by covered vehicles or covered with bitter cloth, and stored in a dry warehouse to prevent moisture. 4.1.6 Coarse seam paste and coke powder shall be prevented from moisture, transported by covered vehicles or with bitter cloth and stored in a dry warehouse. 4.1.7 All kinds of masonry bricks shall be handled with care during transportation and stacking to avoid damage to the brick body. The handling of self-baked carbon bricks shall be very careful to prevent damage to the edges and corners of the bricks and the brick body. 4.1.8 During the transportation and handling of various masonry materials, care shall be taken not to damage the packaging to prevent impurities from mixing. Various masonry materials shall not be mixed.
4.2 Commonly used materials and standards for furnace linings
4.2.1 Self-baked carbon bricks
4.2.1.1 Self-baked carbon bricks shall comply with the provisions of GB6153 "Self-baked carbon bricks for calcium carbide furnaces". Generally, calcium carbide furnaces with a capacity greater than 10000kVA use self-baked carbon bricks with a code name of TKZ-1 and a larger volume density; calcium carbide furnaces with a capacity less than 10000kVA are allowed to use self-baked carbon bricks with a code name of TKZ-2 and a smaller volume density. 4
Standards authorized by the network ca.btaomo.con For the classification, shape, size and allowable deviation, technical indicators, surface quality, testing, inspection, packaging and other requirements of self-baked carbon bricks, please refer to GB6153.
4.2.1.2 The pre-laying and inspection of self-baked carbon bricks shall comply with the provisions of Appendix A "Pre-laying and inspection methods for self-baked carbon bricks for calcium carbide furnaces" (supplement) of GB6153.
4.2.2 Clay Refractory Bricks
4.2.2.1 For the important parts of the furnace wall and furnace bottom of large and medium-sized calcium carbide furnaces, grade ZGN-42 and GN-42 grade blast furnace clay bricks are generally used. Their physical and chemical indicators, appearance and dimensional deviations should comply with the provisions of GB3417 "Clay Bricks for Blast Furnaces". 4.2.2.2 For the furnace wall and unimportant parts of small calcium carbide furnaces, grade N-1 and N-2a clay refractory bricks are generally used. Their physical and chemical indicators, appearance and dimensional deviations should comply with the provisions of GB4415 "Clay Refractory Bricks". 4.2.3 High Alumina Refractory Bricks
4.2.3.1 For the furnace bottom of large and medium-sized calcium carbide furnaces, grade GL-65 high alumina refractory bricks are selected. Their physical and chemical indicators, appearance and dimensional deviations should comply with the provisions of GB2989 "High Alumina Bricks for Blast Furnaces". 4.2.3.2 For the bottom of a small calcium carbide furnace, high-alumina refractory bricks of the LZ-65 brand can be used. The physical and chemical indicators, appearance and dimensional deviations shall comply with the provisions of GB2988 "High Alumina Bricks". 4.2.4 Clay Insulating Refractory Bricks
Clay insulating refractory bricks used for the insulation of the furnace wall of a calcium carbide furnace shall comply with the provisions of GB3994 "Clay Insulating Refractory Bricks".
4.2.5 High Alumina Insulating Refractory Bricks
High Alumina Insulating Refractory Bricks used for the insulation of the furnace wall of a calcium carbide furnace shall comply with the provisions of GB3995 "High Alumina Insulating Refractory Bricks".
4.2.6 Corundum Bricks
Special refractory products such as white corundum, brown corundum, and corundum silicon carbide bricks used to construct the furnace door of a calcium carbide furnace currently have no national standards or ministerial standards, only factory standards. However, it must be guaranteed that: 0.2MPa load softening point is above 1650℃, thermal stability (1100℃ water cooling) is greater than 6 times
4.2.7 Asbestos board
Lined on the inner side of the furnace shell steel plate. The physical and chemical indicators of asbestos board are: white and soft, the highest use temperature is 600℃, and the humidity is less than 4%. Tensile strength: 1.2~1.4MPa on the long fiber side, 0.3~0.7MPa on the short fiber side. The weight loss after burning is not more than 17%. Inspection and acceptance shall be carried out in accordance with the construction standard 11-59 "Asbestos Board". 4.2.8 Fire fiber felt
Ordinary aluminum silicate refractory fiber felt PXZ-1000 for calcium carbide furnace insulation shall comply with the provisions of GB3003 "Ordinary aluminum silicate refractory fiber felt".
4.3 Mud and materials for masonry
4.3.1 Clay refractory mud
Used for masonry of clay refractory bricks, insulation refractory bricks and lining asbestos boards and other general furnace materials, NF-40 fine-grained fire mud can be used to prepare mud. The various indicators of refractory mud should comply with the provisions of YB396 "Clay refractory mud". 4.3.2 High-alumina refractory mud
High-alumina refractory mud used for masonry of high-alumina refractory bricks can choose LF-75 fine-grained fire mud and comply with the provisions of GB2994 "High-alumina refractory mud".
4.3.3 Fine joint paste
Fine joint paste is used for turning over self-baking carbon bricks and should comply with the provisions of YB2808 "Fine joint paste". 4.3.4 Rough joint paste
Rough joint paste is used to fill the joints of carbon bricks and as a protective layer on the surface of carbon bricks. Rough joint paste should comply with the provisions of YB2807 "Rough joint paste".
Phosphate mud
Phosphate mud is used to build the furnace wall of high-alumina bricks of calcium carbide furnace. Phosphate mud is made of high-alumina refractory mud, 85% industrial phosphoric acid and water. The raw material requirements and proportions are shown in Table 4.3.5. Phosphate slurry materials and proportions
High alumina heat powder
Industrial phosphoric acid
4.3.6 Phosphate refractory castables
Raw material composition
Ingredients: Al.0>76%
Fe.0,<0.15%
Particle size:<0.088mm>80%
<0.15mm100%
Concentration: 85%
Weight ratio, %
Add 15~17
Phosphate refractory castables commonly used in calcium carbide furnace masonry are mostly used to cast the furnace door or the arch on the furnace door of the calcium carbide furnace. Its raw materials and proportions are shown in Table 4.3.6.
Phosphate refractory castable source material and proportion
High alumina clinker powder
High alumina hot material sand
High alumina hot material block
Commercial aluminum cement
Industrial phosphoric acid
Raw material composition
Ingredient: Al,0:>75%
Granularity:
Ingredient:
Granularity:
Ingredient: Al,075%
Granularity: 5~20mm
Conforms to GB201 standard, No. 425||t t||Concentration, 45%
Standard investment network wb2o8o.com Table 4.3.6
Weight ratio, %
2 (added before use)
12 (added externally)
5.1.1 Preparation of construction conditions
5 Construction requirements
5.1 Preparation before construction
5.1.1.1 After the furnace shell of the calcium carbide furnace and the metal structures and equipment related to the furnace lining are installed, they meet the requirements of the design drawings and are inspected and accepted according to this regulation before construction can be carried out. 5.1.1.2 All vertical lifting and horizontal transportation equipment required for furnace construction have been installed and passed the test. The tools for construction are fully prepared and meet the construction requirements. 5.1.1.3 All furnace materials are transported to the construction site, accepted and accepted, and the following work is completed: (1) Self-baked carbon bricks must be pre-assembled and numbered, and attached with pre-laying detailed drawings and pre-laying inspection records. (2) The kitchen fire bricks (high alumina bricks, clay bricks) used for the furnace wall and bottom of the calcium carbide furnace must be carefully selected and matched. The thickness difference of bricks in the same layer shall not exceed 1mm, and the matching layer marks and records shall be recorded. (3) Construction personnel must pass the safety education test before they can participate in the construction. 5.1.2 Preparation of construction site and tools
5.1.2.1 The construction site must be carefully considered and properly arranged. Heating equipment such as drying of coke powder for preparing fine joint paste and coarse joint paste, and copying of coarse joint paste should be placed on the side scattered near the calcium carbide furnace. Construction bricks such as carbon bricks and high alumina bricks should be classified and piled in the furnace area.
5.1.2.2 Construction tools and equipment must be fully prepared, such as tar dehydration equipment, coke powder, heating equipment for rough paste, tamping tools, masonry processing tools and equipment (toothed cakes, hammers, wooden hammers, dry hall ceilings, blowtorches, channel steel, paste buckets and small spoons, etc.) before construction can begin.
5.1.2.3 When constructing carbon bricks, it is recommended to use vacuum suction cups for hoisting and placing carbon bricks. 5.2 Requirements for masonry joints
The brick joint thickness of masonry in various parts of the calcium carbide furnace should not exceed the brick joint thickness specified in Table 5.2. Thickness of brick seams in calcium carbide furnace
Cathlic carbide furnace lining materials
Self-baked carbon bricks
High alumina bricks, clay bricks
Furnace door bricks
Insulating refractory bricks
Standard replacement network required
Code brick seam thickness, mm
Horizontal seams
Vertical seams
≤1, circumferential seams<1.5
OM standard industry data free download
5.3 Requirements for fine seam paste
Dehydration requirements of coal tar for preparing fine seam paste should be slow heating, control the oil temperature at 100-120℃, and keep warm for 20-24 hours to ensure complete dehydration.
The prepared fine seam paste should maintain a use temperature above 90℃. 5.4 Requirements for rough joint paste
The rough joint paste must be crushed into pieces less than 20mm, and the thickness of the material layer must be less than 150mm. It must be turned over to 60-80℃ before use.
5.5 Requirements for phosphate mud and phosphate castables5.5.1 When preparing phosphate mud and phosphate castables, iron containers and iron stirring spoons without anti-corrosion protection must not be used to prevent iron from mixing in and affecting the quality of masonry. 5.5.2 Phosphate mud and phosphate refractory castables must be trapped at room temperature for 24 hours before use (the trapping time should be relatively longer when the temperature is low). The ambient temperature during construction must not be lower than 15℃, otherwise appropriate measures must be taken. 5.5.3 The high-alumina cement in the phosphate refractory castable should be added before use and used immediately after stirring evenly. 5.5.4 After the phosphate mud is prepared, it is not allowed to add water and binder at will. "5.6 Requirements for masonry construction
5.6.1 Before laying the furnace lining, the furnace bottom can be leveled with high-aluminum clinker sand. The thickness of this layer should not exceed 10mm. Before laying the high-aluminum clinker sand, the furnace shell and furnace bottom must be dry and clean. The high-aluminum clinker sand must also be kept dry. 5.6.2 Lay refractory bricks on the high-aluminum clinker sand used for leveling the furnace bottom by dry masonry method, and the brick joints should be less than 3mm. Fill the brick joints with dry refractory clinker powder, and stagger the vertical and horizontal brick joints by half a brick. It is strictly forbidden to overlap the brick joints. 5.6.3 After the furnace bottom has a layer of dry refractory bricks, fill the brick joints with refractory clinker powder. , you can use a sweeper to sweep, or use special tools to fill the brick joints, repeat this three times, so that the brick joints are filled with refractory clinker powder. After cleaning, lay the second and third layers of refractory bricks. 5.6.4 Starting from the third layer of bricks, the refractory bricks of the furnace bottom can be laid with mortar method. The vertical joints between the upper and lower layers should be staggered by half bricks and staggered at 30°.
5.6.5 When laying bricks for the furnace lining, do not use iron tools to directly hit the brickwork. Bricks that have been cut off more than 1/2 of the length of the brick and bricks that have been deteriorated due to moisture shall not be used.
5.6.6 The carbon bricks of the furnace bottom and furnace wall should face the refractory One end of the brick and the surface of the carbon brick in contact with the rough seam paste shall be rough-processed, and the surface in contact with the fine seam paste shall be fine-processed.
5.6.7 When one end of the wedge-shaped carbon brick is processed into an inclined surface, the acute angle shall not be less than 70°; when the side is processed, the acute angle shall not be less than 60°. When exceeding the above range, a straight edge of 100mm in length shall be left. 5.6.8 When building carbon bricks, the debris and dust on the surface of the carbon bricks must be cleaned before use. It is strictly forbidden for carbon materials to contact the furnace shell.
Standard Exchange Network aw.bzsomo.com Category Standard Industry Information Science Free download 5.7 Furnace baking
Before laying the self-baking carbon bricks at the furnace bottom, a furnace baking must be carried out to discharge the moisture from the clay bricks and high-alumina bricks. When the clay bricks and high-alumina bricks below the furnace bottom self-baking carbon brick layer are laid and the furnace wall bricks are laid to the bottom edge of the furnace door, stop the masonry work and carry out a furnace baking. The time and temperature of a furnace baking are determined according to factors such as the type of masonry mud, masonry structure and calcium carbide furnace capacity.
After a furnace baking, clean up the ash and other debris left in the furnace before laying the self-baking carbon bricks at the furnace bottom. 5.8 Requirements for the laying of self-baking charcoal bricks at the bottom of the furnace
5.8.1 The laying of self-baking charcoal bricks at the bottom of the furnace should start from the center of the bottom of the furnace and should be laid in parallel. The rows of bricks on the same layer must be parallel to each other, and the adjacent rows of self-baking charcoal bricks must be laid with staggered joints. The center lines of bricks in different layers should be laid at an angle of 30°. 5.8.2 When laying the self-baking charcoal bricks at the bottom of the furnace, first lay the first brick at the center of the bottom of the furnace and measure the horizontality of its upper surface and the verticality of the bricks to meet the requirements, and then lay them on both sides. When laying, the bricks must be tightened with a jack so that the horizontal and vertical joints are less than 1mm, and carbon paste is required to be squeezed out between the bricks during laying. At the same time, check the verticality and horizontality to meet the requirements. When laying to the position of the furnace wall, use reverse wooden wedges to tighten, and at the same time ensure that the surrounding refractory bricks are not loose. At this point, the laying of the first row of charcoal bricks is completed.
5.8.3 After the first row of carbon bricks is completed, continue to lay the rows of carbon bricks after the second row. Each row of bricks must be parallel to the first row of carbon bricks and meet the requirements of the verticality of the brick joints and the horizontality of the brick surface. 5.8.4 After a layer of self-baked carbon bricks is laid, an annular gap is formed between the edge of the self-baked carbon bricks and the furnace wall, which is wedged with a wooden wedge. The annular gap must be filled with coarse seam paste and the wooden wedge is removed at the same time. For details, see 5.105.8.5 The laying of the next layer of carbon bricks must be completed after the previous layer of carbon bricks is completed. After the ring is filled with coarse seam paste, the entire carbon brick layer is leveled to meet the horizontal requirements before the laying of the next layer of carbon bricks can be carried out. 5.9 Requirements for the laying of self-baked carbon bricks in the ring of the furnace wall
5.9.1 When laying the self-baked carbon bricks in the ring of the furnace wall of the calcium carbide furnace, use a dry jack to tighten every 4 to 5 carbon bricks. Before the jack is tightened, use a reverse wood wedge to tighten the furnace wall refractory bricks and the ring carbon bricks. Check whether the vertical joints and ring joints in the masonry meet the requirements. After tightening, it is necessary to temporarily stop laying for 15 to 20 minutes. After the carbon paste cools down and "dries and solidifies", it can continue laying. 5.9.2 The laying of the ring carbon bricks in the furnace door area should be based on the pre-laying drawing and start from the middle of the two furnace doors. The height of the carbon bricks at the furnace door is not allowed to be lower than the design size, and it is strictly forbidden for the carbon case material to contact the furnace shell. ! 5.9.3 After each ring of carbon bricks is laid, the gap between the furnace wall and the carbon bricks must be filled and tamped with coarse joint paste, and the wooden mold is removed at the same time. Requirements for filling the annular gap of self-baked carbon bricks 5.10
The annular gap filling material of self-baked carbon bricks adopts rough joint paste. 5.10.1
5.10.2 On the surface of the refractory brick wall in contact with the rammed layer of the annular gap, a layer of asphalt should be applied to make the rammed layer easy to bond with the refractory bricks.
Standards According to the network ws.bzaoa.com Various standards Industry information free download 9
5.10.3 The rough joint paste used as the filling material must be filled and fully tamped. The thickness of the rough joint paste poured into the annular gap each time should be 100~150mm. The filling material after tamping should be 2~3mm higher than the surface of the carbon brick body. 5.10.4 The wedge shall not be removed in the part that has not been filled with the rammed rough joint paste, and the filling and tamping work shall be carried out simultaneously at the symmetrical parts of the diameter to ensure the quality of the masonry. 5.11 Inspection during and after the laying of self-baked carbon bricks 5.11.1 During the laying of self-baked carbon bricks and after the entire layer of masonry is completed, the seams must be checked one by one. The furnace lining after laying is not allowed to have local sinking or cracking of the masonry. Each layer of self-baked carbon bricks must be carefully inspected after laying, and the carbon bricks and masonry seams are not allowed to have cracks or cracks.
5.11.2 The thickness of the brick seams of the self-baked carbon brick masonry is checked with a feeler gauge. The width of the feeler gauge is 30mm, and the thickness of the feeler gauge is equal to the specified thickness of the brick seam being inspected. If the depth of the feeler gauge inserted into the brick seam does not exceed 100mm, the brick seam is considered to be qualified. 5.12 Inspection standards for masonry of high-aluminum bricks, clay bricks, etc. The inspection of refractory masonry such as high-aluminum bricks and clay bricks should be inspected and accepted according to the inspection methods of the relevant clauses in GBJ211 "Construction and Acceptance Code for Industrial Furnace Construction Projects". 5.13 Inspection requirements for furnace bottom unevenness
The self-baked carbon brick masonry that fully covers the furnace bottom is checked with a 2m level ruler, and the surface flatness error shall not exceed 5mm. The upper surface of the self-baked carbon bricks in each layer of the molten pool is checked with a 2m level ruler, and the surface flatness error shall not exceed 5mm. 5.14 Allowable deviation of furnace wall and molten pool radius The radius error of the furnace wall and molten pool of calcium carbide furnace shall not exceed 20mm, and the allowable deviation of the molten pool depth is ±25mm. 5.15 Protection of carbon materials at the furnace bottom
5.15.1 The carbon filling layer of the furnace bottom molten pool adopts coarse seam paste. It should be rammed into a slope with the slope inclined to the furnace door, and the thickness of each ramming material layer shall not exceed 50mm.
5.15.2 After the carbon filling layer of the furnace bottom molten pool is rammed, it is necessary to promptly build a layer of high-alumina bricks or clay bricks as a protective layer of carbon materials to prevent the carbon material masonry in the furnace and the molten pool from being oxidized during furnace baking. 10
Standards are available for free download from www.bzaoa.com. 6.0.1 The project acceptance shall be carried out in accordance with these technical conditions. 6.0.2 Information to be provided for project acceptance:
(1) Construction drawings:
The design changes during the construction process shall be noted on the construction drawings. If there are major changes, the construction unit shall submit the completion drawings. (2) Certification materials for refractory materials:
The certification materials for refractory materials include the factory certificate, necessary inspection certificates, mortar preparation records, refractory castable preparation records and test reports.
Inspection records of the main parts of the furnace, measurement records of mortar joints, and process handover certificates.
The process handover certificate includes:
Measurement records of the center line of the calcium carbide furnace and the control standard height. Re-measurement records of the installation position of the calcium carbide furnace shell. Manufacturing acceptance records of the calcium carbide furnace shell.
Records of concealed works.
Standards Grant Jie Network·Shop
con Free download of various standard industry information1 During the laying process of self-baked carbon bricks and after the whole layer of masonry is completed, the seams must be checked one by one. The furnace lining after laying is not allowed to have local sinking or cracking of the masonry. Each layer of self-baked carbon bricks must be carefully checked after laying, and the carbon bricks and masonry seams must not have cracks or cracks.
5.11.2 The thickness of the brick seams of the self-baked carbon brick masonry is checked with a feeler gauge. The width of the feeler gauge is 30mm, and the thickness of the feeler gauge is equal to the specified thickness of the brick seam being checked. If the depth of the feeler gauge inserted into the brick seam does not exceed 100mm, the brick seam is considered to be qualified. 5.12 Inspection standards for masonry of high-alumina bricks, clay bricks, etc. The inspection of refractory masonry such as high-alumina bricks and clay bricks should be inspected and accepted according to the inspection methods of the relevant clauses in GBJ211 "Construction and Acceptance Code for Industrial Furnace Construction Projects". 5.13 Inspection requirements for unevenness of furnace bottom
The self-baked carbon brick masonry that fully covers the furnace bottom is inspected with a 2m level ruler, and the surface flatness error shall not exceed 5mm. The upper surface of each layer of self-baked carbon bricks in the molten pool is checked with a 2m level ruler, and the surface flatness error shall not exceed 5mm. 5.14 Allowable deviation of furnace wall and molten pool radius The radius error of calcium carbide furnace wall and molten pool shall not exceed 20mm, and the allowable deviation of molten pool depth is ±25mm. 5.15 Protection of carbon materials at the bottom of the furnace
5.15.1 The carbon filling layer of the furnace bottom molten pool adopts coarse seam paste. It should be rammed into a slope with the slope inclined to the furnace door, and the thickness of each rammed material layer shall not exceed 50mm.
5.15.2 After the carbon filling layer of the furnace bottom molten pool is rammed, it is necessary to promptly build a layer of high-alumina bricks or clay bricks as a protective layer of carbon materials to prevent the carbon material masonry in the furnace and the molten pool from being oxidized during the furnace baking. 10
Standards are available for free download from www.bzaoa.com. 6.0.1 The acceptance of the project shall be carried out in accordance with these technical conditions. 6.0.2 Information to be provided for the acceptance of the project:
(1) Construction drawings:
The design changes during the construction process shall be noted on the construction drawings. If there are major changes, the construction unit shall submit the completion drawings. (2) Certification materials of refractory materials:
The certification materials of refractory materials include the factory certificate, necessary inspection certificates, mortar preparation records, refractory castable preparation records and test reports.
Inspection records of the main parts of the furnace, measurement records of mortar joints, and process handover certificates.
The process handover certificate includes:
Measurement records of the center line of the calcium carbide furnace and the control standard height. Re-measurement records of the installation position of the calcium carbide furnace shell. Manufacturing acceptance records of the calcium carbide furnace shell.
Records of concealed works.
Standards Grant Jie Network·Shop
con Free download of various standard industry information1 During the laying process of self-baked carbon bricks and after the whole layer of masonry is completed, the seams must be checked one by one. The furnace lining after laying is not allowed to have local sinking or cracking of the masonry. Each layer of self-baked carbon bricks must be carefully checked after laying, and the carbon bricks and masonry seams are not allowed to have cracks or cracks.
5.11.2 The thickness of the brick seams of the self-baked carbon brick masonry is checked with a feeler gauge. The width of the feeler gauge is 30mm, and the thickness of the feeler gauge is equal to the specified thickness of the brick seam being checked. If the depth of the feeler gauge inserted into the brick seam does not exceed 100mm, the brick seam is considered to be qualified. 5.12 Inspection standards for masonry of high-alumina bricks, clay bricks, etc. The inspection of refractory masonry such as high-alumina bricks and clay bricks should be inspected and accepted according to the inspection methods of the relevant clauses in GBJ211 "Construction and Acceptance Code for Industrial Furnace Construction Projects". 5.13 Inspection requirements for unevenness of furnace bottom
The self-baked carbon brick masonry that fully covers the furnace bottom is checked with a 2m level ruler, and the surface flatness error shall not exceed 5mm. The upper surface of each layer of self-baked carbon bricks in the molten pool is checked with a 2m level ruler, and the surface flatness error shall not exceed 5mm. 5.14 Allowable deviation of furnace wall and molten pool radius The radius error of calcium carbide furnace wall and molten pool shall not exceed 20mm, and the allowable deviation of molten pool depth is ±25mm. 5.15 Protection of carbon materials at the bottom of the furnace
5.15.1 The carbon filling layer of the furnace bottom molten pool adopts coarse seam paste. It should be rammed into a slope with the slope inclined to the furnace door, and the thickness of each rammed material layer shall not exceed 50mm.
5.15.2 After the carbon filling layer of the furnace bottom molten pool is rammed, it is necessary to promptly build a layer of high-alumina bricks or clay bricks as a protective layer of carbon materials to prevent the carbon material masonry in the furnace and the molten pool from being oxidized during furnace baking. 10
Standards are available for free download from www.bzaoa.com. 6.0.1 The acceptance of the project shall be carried out in accordance with these technical conditions. 6.0.2 Information to be provided for the acceptance of the project:
(1) Construction drawings:
The design changes during the construction process shall be noted on the construction drawings. If there are major changes, the construction unit shall submit the completion drawings. (2) Certification materials of refractory materials:
The certification materials of refractory materials include the factory certificate, necessary inspection certificates, mortar preparation records, refractory castable preparation records and test reports.
Inspection records of the main parts of the furnace, measurement records of mortar joints, and process handover certificates.
The process handover certificate includes:
Measurement records of the center line of the calcium carbide furnace and the control standard height. Re-measurement records of the installation position of the calcium carbide furnace shell. Manufacturing acceptance records of the calcium carbide furnace shell.
Records of concealed works.
Standards Grant Jie Network·Shop
con Free download of various standard industry information
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.