JB/T 6508-1992 Technical requirements for waste heat boilers for oxygen converters
Some standard content:
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Waste Heat Boilers of Oxygen Converters
Subject Content and Scope of Application
JB/T6508-92
This standard specifies the technical requirements for waste heat boilers of oxygen converters, the standards to be followed in testing, acceptance rules, and matters such as manufacturing, installation, marking and packaging.
This standard applies to various types of waste heat boilers of oxygen converters with a rated outlet steam pressure of no more than 3.82MPa or an outlet water temperature greater than or equal to 95C using water as the medium.
Cited Standard
ZBJ98 017
JB/T6503
Product model compilation method of flue-type waste heat boiler General technical conditions of flue-type waste heat boiler
GB10864.4
GB9222
GB1576
GB10863
Parameter series of waste heat boiler Oxygen converter waste heat boiler Water tube boiler Strength calculation of pressure components
Low-pressure boiler water quality standard
Thermal test method of flue-type waste heat boiler
GB2900.48
GB3323
JB3375
JB1609
JB1610
GB1804
JB1611
JB1612|| tt||Electrical terminologyFixed furnace
Radiography and quality grading of steel fusion welded butt jointsIncoming inspection of boiler raw materials
Technical conditions for boiler drum manufacturing
Technical conditions for boiler header manufacturing
Tolerances and fitsLimit deviations of dimensions without tolerancesTechnical conditions for boiler tube manufacturing
Technical conditions for boiler water pressure test
JB/T1615
3 Terminology
Technical conditions for boiler painting and packaging
3.1 Oxygen converter waste heat boiler
A boiler that uses the sensible heat of the furnace gas discharged from the regasification steelmaking converter and the heat generated by the combustion of a small part of the combustible gas therein as its heat source is called an oxygen converter waste heat boiler. It is mainly composed of a movable smoke hood, a furnace mouth section flue, a flue, a drum, an outlet pipe, a downcomer, etc. 3.2 Movable smoke hood
It is a tubular pressure-bearing component composed of an annular header and pipes, and has a furnace gas lifting and sealing pair. It is the inlet channel for converter gas discharge, and a small part of the combustible gas burns in the hood. The smoke hood is lifted up and down or translated according to the steelmaking process operation requirements, and is called a movable smoke hood. 3.3 Furnace mouth section flue
It is a tubular pressure-bearing component composed of an annular header and pipes, and has a furnace gas sealing pair. It is a part of the furnace gas channel. The steelmaking process requires that the oxygen gun hole and the material discharge port be set at a fixed position on this section of the flue, which is called the furnace mouth section flue. 3.4 Oxygen gun hole vaporization cooling element
Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on December 21, 199240
Implemented on May 1, 1993
JB/T 6508--92
A pressure-bearing component composed of an annular header (or partition) and a pipe. In order to improve the quality of recovered gas and improve environmental hygiene, a nitrogen seal or steam seal device is installed between the cooling element and the oxygen gun.
3.5 Feed port vaporization cooling element
A pressure-bearing component composed of an annular header (or partition) and a pipe and taking anti-wear measures. In order to prevent gas from entering the silo, a hydrogen seal device is installed.
3.6 Flue
The tubular pressure-bearing component composed of an annular header (or header) and pipes is another part of the furnace gas channel and is called a flue. The flue can be composed of several sections according to the requirements of steelmaking process layout, installation and maintenance. 3.7 Annular header
The oblong, orange, or round annular tubular pressure-bearing component that connects parallel pipes to collect or distribute the working fluid in multiple pipes is called an annular header.
General requirements
4.1 The technical requirements of oxygen converter waste heat boilers (hereinafter referred to as boilers) must comply with the provisions of the "Safety Technical Supervision Regulations for Steam Boilers" and the "Safety Technical Supervision Regulations for Hot Water Boilers" respectively, except for the special provisions of this standard. 4.2 The model compilation of furnace products shall comply with ZBJ98017. 4.3 Furnace products shall be manufactured according to the drawings approved through the prescribed procedures and shall be manufactured in units holding manufacturing licenses of corresponding levels.
Strength calculation of boiler pressure components must comply with the provisions of GB9222. 4.4
Material substitution of boiler pressure components shall be handled in accordance with relevant regulations. The material and manufacturing technical requirements of the main parts and components (assemblies) of the boiler shall comply with the provisions of the relevant furnace manufacturing standards in addition to the provisions of this standard. 4.6
5 Design
5.1 For oxygen converters with a capacity of 15 tons (including 13-15 tons) or more that use coal gas, the boiler parameters and structural types should be reasonably selected in combination with factors such as the steel-melting process layout and operation mode, and the adaptability to changes in converter load should be considered. 5.2 If the temperature of the boiler exhaust gas is higher than 610C, the boiler flue may not be equipped with a gas explosion-proof hole. 5.3 The life of individual parts of the boiler is short. In order to ensure the normal operation of the converter, it should be designed to be easy to disassemble and replace. 5.4 Effective measures should be taken to prevent dust accumulation, corrosion and wear during boiler design. Anti-freeze measures should also be considered in cold areas. . 5.5 After the flue is divided into sections, the heat load of each section is different. The ratio of the flow section of the downcomer and the flow section of the outlet pipe to the total flow section of the heating surface pipe of each section is recommended to be selected according to Table 1.
Flow section ratio, %
Downcomer/heating surface pipe
20～30
Outlet pipe/heating surface pipe
5.6 The humidity of saturated steam at the boiler outlet is not more than 3%. JB/T6508—92
5.7 Under normal operating conditions, when the ambient temperature is 25C, the outer wall temperature of the insulation layer of the boiler (except the movable smoke hood) should not be higher than 50℃.
5.8-The regular sewage discharge of the movable smoke hood and the lower header of the furnace mouth section flue can be carried out by siphon discharge, and a short drainage cecum pipe with a head is provided. , the inner diameter can be 40~50mm, and the length should not exceed 70mm. 5.9 The water quality of the boiler should meet the requirements of GB1576. Any products with special requirements should be indicated in the technical agreement. 5.10 The connection between the movable smoke hood and the downcomer and the outlet pipe must meet the requirements of the movable smoke hood rising, falling and translation. 6 Manufacturing
6.1 The main raw materials of the boiler must be inspected by the inspection department in accordance with the provisions of JB3375. Those that have not been inspected or have failed the inspection are not allowed to be put into manufacturing.
6.2 The boiler shell shall be manufactured in accordance with the provisions of JB1609. 6.3 The header shall be manufactured in accordance with the provisions of JB1610, and the annular header is recommended to be manufactured in accordance with the requirements of Appendix A. 6.4 The manufacture of pipes (pipelines) shall be in accordance with the relevant provisions of JB1611. The pipes are TIG welding should be used for base welding. 6.5 Welding requirements
6.5.1 The welding of pressure-bearing components shall have corresponding welding process assessment and process regulations. 2 The welders who weld boiler pressure components must be qualified according to the "Test Rules for Boiler Pressure Vessel Welders", and the welding items 6.5.2
shall be consistent with the qualified test items.
The welder code must be stamped near the weld of the boiler pressure-bearing components (low stress stamp). 6.5.3
6.5.4 Number of product inspection test pieces
6.5.4.1 Each longitudinal and circumferential seam of each boiler shell shall be inspected with a test plate. When the parent material and welding process of the circumferential seam are the same as those of the longitudinal seam, only the longitudinal seam inspection test plate can be made, and the circumferential seam inspection test plate is exempted. 6.5.4.2 For the butt joints of headers and pipelines, 1% of the inspection test pieces shall be made in each boiler product, but not less than one. 6.5.4.3
Tubes (heating surfaces) can be cut from 0.5% of the butt joints on each boiler product as inspection test plates, but not less than the number of joints required for a set of test specimens.
It is not advisable to cut the welded joints of the test pieces on the product, but simulated inspection test pieces can be welded. 6.5.4.4 If there are two or more welders welding each boiler product, the inspection test pieces should be made and cut by each welder separately, but each welder should not be less than the number of joints required for a set of test specimens, and the welder code should be stamped on the weld respectively. 6.6 The number of radiographic inspections for girth welds of headers, tubes and pipelines is stipulated as follows: a.
25%;
When D is greater than 159mm, 100% for each weld; for girth welds of headers with Dw less than or equal to 159mm, at least 25% for each weld, and no less than the number of header welds; for tubes and pipelines with Dw less than or equal to 159mm, 2%~5% of the number of joints should be inspected. e.
When dense tube bundles cannot be inspected, simulated specimens can be used instead. 6.7 Radiographic inspection of butt welds shall be in accordance with the provisions of GB3323, and the quality requirements of radiography shall not be lower than AB grade; the quality of butt welds shall not be lower than [Grade is qualified
6.8 After the manufacture of various flues, the height and horizontal center offset, and the dimensional error shall not exceed 1.5/1000, the total height of all flues, the cumulative dimensional error of the total horizontal center offset shall not exceed 1/1000. 6.9 The boiler water pressure test shall be carried out after the non-destructive testing and related inspection items are qualified. For the boiler pressure components that need to be heat treated, it shall be carried out after the heat treatment.
The water pressure test requirements shall be in accordance with the provisions of JB1612 and Table 2. 42
Moveable smoke hood
Furnace mouth section flue
Oxygen gun hole vaporization cooling parts
Feeding port vaporization cooling parts
Boiler installation requirements
Steel furnace installation shall refer to the requirements of Appendix B. Test, appraisal, acceptance
JB/T6508-92
Hydraulic test pressure of boiler parts and components
Working pressure P of parts and componentsbzxZ.net
Any pressure
Hydraulic test pressure P,
8.1 Test and appraisal shall be in accordance with the relevant provisions of JB/T6503. 8.2 When operating under design conditions, the average steam volume of the boiler during the oxygen blowing period shall not be lower than the guaranteed value. The guaranteed value shall be determined by agreement. If there is no agreement, refer to the relevant provisions of GB10864.4.
Marking, painting, packaging, storage
Each boiler should have a fixed metal nameplate in a conspicuous position, and the content on the nameplate should at least include: a.
Manufacturer name;
Product model and name;
Main technical specifications:
Steam boiler: average steam production during oxygen blowing period, rated steam pressure, rated steam temperature; hot water boiler: rated heating capacity, design working pressure, rated outlet/inlet water temperature; d.
Manufacturer product number;
Boiler manufacturing license level and number;
Manufacture date.
The paint coating and packaging of the boiler shall be carried out in accordance with JB/T1615. In order to prevent scale from directly sticking to the metal surface and facilitate cleaning, the inner surface of the boiler shell and the internal device of the steel cylinder shall be painted with asphalt boiler paint twice (performed in the manufacturing unit).
Each boiler shall be provided with the following drawings and technical documents when it leaves the factory: a.
Boiler drawings (general drawings and ± drawings of pressure-bearing components): Strength calculation of pressure-bearing components;
Safety valve exhaust volume calculation;
Product installation and operation instructions;
Notification of design changes of pressure-bearing components;
Drawings and document lists supplied to customers, spare parts and wearing parts lists; Product quality certificates;
General supply list and packing list.
Note: The method and quantity of drawings supplied shall be stipulated in the contract or agreement. 9.5 Under the conditions stipulated in this standard and relevant documents and agreements, the user shall provide the following documents and technical documents: within twelve months from the date when the last batch of parts of the boiler leaves the factory or within six months from the date when it is put into operation (if the factory period exceeds twelve months and the operation period is less than six months, the factory period shall prevail. If the factory period is less than twelve months and the operation period exceeds six months, the operation period shall prevail). If damage or failure to operate normally is caused by poor design product performance and manufacturing quality, the design unit shall be responsible for product performance problems, and the manufacturing unit shall be responsible for manufacturing quality problems. 43
JB/T6508—92
Appendix A
Manufacture of annular header
(reference)
A1 When the nominal outer diameter Dw of the annular header pipe is greater than 60mm, the bent or shaped header needs to be checked for ellipticity. The ellipticity a is calculated according to formula (A1), and its value should not exceed the provisions of Table A1 (see Figure A1). Dm
Where D
The maximum outer diameter on the cross section of the bent pipe, mm:
The minimum outer diameter on the cross section of the bent pipe, mm;
The nominal outer diameter of the steel pipe. mm.
Tube radius R
Ellipticity
A2Splicing
1.5D%R<2.5D
2.5DSR<4D
R≥4D
A2.1When the annular header needs to be spliced, the number of spliced annular seams in a header should not exceed 4, and the length of the inner chord of the shortest section should not be less than 500mm.
A2.2The butt weld of the annular header shall adopt a full-penetration structure and shall be welded with hydrogen arc welding. A2.3Weld edge deviation
The edge deviation of the inner diameter of the pipe shall not be greater than 10% of the wall thickness plus 0.5mm, and shall not be greater than 1mm. The edge deviation of the outer diameter of the pipe shall not be greater than 10% of the wall thickness plus 1mm and shall not be greater than 2mm. When steel pipes with the same nominal outer diameter but different actual outer diameters are butt-jointed, the center and weld groove should be aligned as much as possible, and the requirement is that (a-b) should not exceed 2mm (see Figure A2).
When the edge deviation exceeds the above provisions, thinning must be carried out, and the thinning length should not be less than 4 times the thickness of the secondary thinning (see Figure A3). 4
JB/T6508-92
The dimensional deviation and maximum and minimum diameter difference of the annular header shall be in accordance with the provisions of Table A2 (see Figure A4 and Figure A5). Det
For oblong and elliptical headers, the major axis and minor axis are used as the diameters, and the diameter tolerance in Table A3 is met. Note: According to the section diameter D, the outer diameter or inner diameter of the annular header is converted for inspection. Figure A5
Table A2 Dimensional deviation and maximum pier minor diameter difference of annular header Pitch diameter D
≤800
801~1200
1201~1600
1601~2400
2401~3000
30014000
Header flatness (Figure A6)
Diameter tolerance
For annular headers with Dw greater than or equal to 159mm, AC shall not be greater than 3
Maximum minimum diameter difference
D, and shall not be greater than 8mm.
D, shall not be greater than 6mm.
For annular headers with Dw less than 159mm, AC is not greater than 11000
JB/T6508-92
The diameter of the opening on the header is less than 108mm. The pipe hole should be opened by mechanical methods. The diameter size of the pipe hole is in accordance with Table A3 (Figure A7).
The processing tolerance of the pipe hole is selected according to GB1804IT14 (H14). The weld height K value in the figure is recommended as follows:
S≤3mm,K=4mm;
35 Under the conditions stipulated in this standard and relevant documents and agreements, within twelve months from the date when the last batch of boiler parts leave the factory or within six months from the date of commissioning (if the factory period exceeds twelve months and the operation period is less than six months, the factory period shall prevail. If the factory period is less than twelve months and the operation period exceeds six months, the operation period shall prevail). If damage or failure to operate normally is caused by poor design product performance and manufacturing quality, the design unit shall be responsible for product performance problems, and the manufacturing unit shall be responsible for manufacturing quality problems. 43
JB/T6508—92
Appendix A
Manufacturing of annular header
(reference)
A1 When the nominal outer diameter Dw of the annular header pipe is greater than 60mm, the bent or shaped header needs to be checked for ellipticity. The ellipticity a is calculated according to formula (A1), and its value should not exceed the provisions of Table A1 (see Figure A1). Dm
Where D
Maximum outer diameter on the cross section of the elbow, mm:
Minimum outer diameter on the cross section of the elbow, mm;
Nominal outer diameter of the steel pipe. mm.
Tube radius R
Ellipticity
A2Splicing
1.5D%R<2.5D
2.5DSR<4D
R≥4D
A2.1When the annular header needs to be spliced, the number of spliced annular seams in a header should not exceed 4, and the length of the chord in the shortest section should not be less than 500mm.
A2.2The butt weld of the annular header shall adopt a full coal penetration structure and shall be welded with hydrogen arc welding as the base. A2.3 Weld edge deviation
The edge deviation of the inner diameter of the pipe shall not be greater than 10% of the wall thickness plus 0.5mm, and shall not be greater than 1mm. The edge deviation of the outer diameter of the pipe shall not be greater than 10% of the wall thickness plus 1mm and shall not be greater than 2mm. When steel pipes with the same nominal outer diameter but different actual outer diameters are butt-jointed, they should be aligned with the center and the weld groove as much as possible, and the requirement (a-b) should not be greater than 2mm (see Figure A2).
When the edge deviation exceeds the above provisions, thinning must be carried out, and the thinning length should not be less than 4 times the thickness of the secondary thinning (see Figure A3). 4
JB/T6508-92
The dimensional deviation and maximum and minimum diameter difference of the annular header shall be in accordance with the provisions of Table A2 (see Figure A4 and Figure A5). Det
For oblong and elliptical headers, the major axis and minor axis are used as the diameters, and the diameter tolerance in Table A3 is met. Note: According to the section diameter D, the outer diameter or inner diameter of the annular header is converted for inspection. Figure A5
Table A2 Dimensional deviation and maximum pier minor diameter difference of annular header Pitch diameter D
≤800
801~1200
1201~1600
1601~2400
2401~3000
30014000
Header flatness (Figure A6)
Diameter tolerance
For annular headers with Dw greater than or equal to 159mm, AC shall not be greater than 3
Maximum minimum diameter difference
D, and shall not be greater than 8mm.
D, shall not be greater than 6mm.
For annular headers with Dw less than 159mm, AC is not greater than 11000
JB/T6508-92
The diameter of the opening on the header is less than 108mm. The pipe hole should be opened by mechanical methods. The diameter size of the pipe hole is in accordance with Table A3 (Figure A7).
The processing tolerance of the pipe hole is selected according to GB1804IT14 (H14). The weld height K value in the figure is recommended as follows:
S≤3mm,K=4mm;
35 Under the conditions stipulated in this standard and relevant documents and agreements, within twelve months from the date when the last batch of boiler parts leave the factory or within six months from the date of commissioning (if the factory period exceeds twelve months and the operation period is less than six months, the factory period shall prevail. If the factory period is less than twelve months and the operation period exceeds six months, the operation period shall prevail). If damage or failure to operate normally is caused by poor design product performance and manufacturing quality, the design unit shall be responsible for product performance problems, and the manufacturing unit shall be responsible for manufacturing quality problems. 43
JB/T6508—92
Appendix A
Manufacturing of annular header
(reference)
A1 When the nominal outer diameter Dw of the annular header pipe is greater than 60mm, the bent or shaped header needs to be checked for ellipticity. The ellipticity a is calculated according to formula (A1), and its value should not exceed the provisions of Table A1 (see Figure A1). Dm
Where D
Maximum outer diameter on the cross section of the elbow, mm:
Minimum outer diameter on the cross section of the elbow, mm;
Nominal outer diameter of the steel pipe. mm.
Tube radius R
Ellipticity
A2Splicing
1.5D%R<2.5D
2.5DSR<4D
R≥4D
A2.1When the annular header needs to be spliced, the number of spliced annular seams in a header should not exceed 4, and the length of the chord in the shortest section should not be less than 500mm.
A2.2The butt weld of the annular header shall adopt a full coal penetration structure and shall be welded with hydrogen arc welding as the base. A2.3 Weld edge deviation
The edge deviation of the inner diameter of the pipe shall not be greater than 10% of the wall thickness plus 0.5mm, and shall not be greater than 1mm. The edge deviation of the outer diameter of the pipe shall not be greater than 10% of the wall thickness plus 1mm and shall not be greater than 2mm. When steel pipes with the same nominal outer diameter but different actual outer diameters are butt-jointed, they should be aligned with the center and the weld groove as much as possible, and the requirement (a-b) should not be greater than 2mm (see Figure A2).
When the edge deviation exceeds the above provisions, thinning must be carried out, and the thinning length should not be less than 4 times the thickness of the secondary thinning (see Figure A3). 4
JB/T6508-92
The dimensional deviation and maximum and minimum diameter difference of the annular header shall be in accordance with the provisions of Table A2 (see Figure A4 and Figure A5). Det
For oblong and elliptical headers, the major axis and minor axis are used as the diameters, and the diameter tolerance in Table A3 is met. Note: According to the section diameter D, the outer diameter or inner diameter of the annular header is converted for inspection. Figure A5
Table A2 Dimensional deviation and maximum pier minor diameter difference of annular header Pitch diameter D
≤800
801~1200
1201~1600
1601~2400
2401~3000
30014000
Header flatness (Figure A6)
Diameter tolerance
For annular headers with Dw greater than or equal to 159mm, AC shall not be greater than 3
Maximum minimum diameter difference
D, and shall not be greater than 8mm.
D, shall not be greater than 6mm.
For annular headers with Dw less than 159mm, AC is not greater than 11000
JB/T6508-92
The diameter of the opening on the header is less than 108mm. The pipe hole should be opened by mechanical methods. The diameter size of the pipe hole is in accordance with Table A3 (Figure A7).
The processing tolerance of the pipe hole is selected according to GB1804IT14 (H14). The weld height K value in the figure is recommended as follows:
S≤3mm,K=4mm;
3
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