Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6696-1993
Technical Conditions for Power Plant Boilers
Published on 1993-06-01
Ministry of Machinery Industry of the People's Republic of China
Implementation on 1994-01-01
1 General Provisions
Mechanical Industry Standard of the People's Republic of China
Technical Conditions for Power Plant Boilers
JB/T6696-93
1.1 This standard applies to power plant boilers with an evaporation capacity of 220 to 125 t/h. For power plant boilers with other evaporation capacities, this standard can be used as a reference. 1.2 For all power plant boilers that apply to this standard, this standard must be followed during their body design, manufacturing, system design, installation, startup, commissioning, operation, equipment acceptance and signing of corresponding technical agreements. 1.3. This standard does not involve the division of labor and supply scope of boiler products. 1.4 Matters not covered by this standard shall be separately agreed upon when signing the corresponding technical agreement. 2 Reference standards
GB9222
JB1615
JB2638
3 General provisions
Steam boiler parameter series
Urban area environmental noise standard
Strength calculation of pressure components of water tube boiler
Technical conditions for boiler paint and packaging
Technical conditions for manufacturing of rotary air preheater Technical regulations for design of thermal power plants
Technical specifications for construction and acceptance of power construction
3.1 The rated evaporation capacity and steam parameters of power station boilers shall comply with the provisions of GB753. 3.2 The design, manufacture, installation and operation of power station boilers must comply with the provisions of the "Steam Boiler Safety Technical Supervision Regulations" issued by the Ministry of Labor and Personnel of the People's Republic of China.
3.3 Power station boilers should be manufactured according to the drawings approved in the prescribed order and strictly implement the boiler standards issued by GB9222 and the Ministry of Machinery and Electronics Industry.
3.4 The design of boiler unit system shall comply with the provisions of "Technical Supervision Regulations for Steam Boiler Safety" and "Technical Management Regulations for Electric Power Industry" SDJ1 issued in 1980.
3.5 The installation of power station boilers shall be carried out in accordance with the installation drawings and relevant technical documents provided by the manufacturer, and shall comply with the provisions of DLJ52. 3.6 The operation, startup and commissioning of power station boilers must comply with the "Technical Management Regulations for Electric Power Industry" issued in 1980 and its supplementary provisions and the corresponding typical boiler operation procedures and relevant technical documents of the manufacturer. 4 Boiler body design and manufacturing
4.1 Power station boilers shall be designed in accordance with the technical agreement signed between the user and the manufacturer. 4.2 The boiler shall meet the following requirements when the main auxiliary equipment and systems are put into normal operation and meet the boiler design conditions, in compliance with the general provisions of Chapter 3 and the requirements of Article 4.1 of this chapter:
a. The boiler evaporation capacity and parameters should reach the rated value, and under this condition, it should be able to operate safely for a long time; b. Under the rated evaporation capacity, the boiler thermal efficiency shall not be lower than the guaranteed value specified in the technical agreement (the difference between the guaranteed value and the design value is generally not more than 1.5%, and the difference for some coal types shall not exceed 2%; the Ministry of Machinery Industry approved on June 1, 1993
199401-01 implementation
JB/T6696-93
Under the specified working pressure, when the rated evaporation capacity is 70% to 100%, the superheated steam and reheated steam temperature of the stage boiler should be able to reach the rated value, and the deviation should comply with the provisions of GB753. Under various loads, the metal temperature of each section of the heating surface is within the allowable range; d. When the natural circulation boiler is 50%100% rated When the boiler is operated at a fixed evaporation rate, the water circulation is safe and reliable. When the UP type direct current boiler is operated at 30% to 100% of the rated evaporation rate, the water dynamics is safe and reliable: e
Note; For boilers with ultra-high pressure and above parameters, measures should be taken to prevent the deterioration of heat transfer. When the feed water quality meets the requirements, the boiler steam quality should meet the requirements of the (Regulations on Water and Steam Supervision of Thermal Power Plants" issued in 1975.
Regulations,
4.3 Under normal operating conditions, the overhaul interval of the boiler should be 2 to 3 years, and the minor repair interval should be half a year. Within one year after the boiler is put into production, the number of forced shutdowns caused by manufacturing quality should meet the following regulations: 4.4
New boilers should not exceed 4 times;
b, standard boilers should not exceed 2 times.||t t||4.5 The service life of the sewage system valve should reach 1 year after the boiler is put into normal operation. 4.6 Under normal operating conditions of the boiler unit, when the ambient temperature is 25℃, the surface temperature of the furnace wall of the indoor boiler shall not exceed 50℃, and the surface temperature of the furnace wall of the outdoor boiler shall not exceed 45℃. 4.7 The design pressure drop of the boiler steam-water system shall be in accordance with the following provisions: a.
The steam pressure drop of the superheater is generally 10% of the main steam outlet pressure. The resistance distribution of the reheater system is determined by negotiation between the main body and the system design: The pressure drop of the economizer and connecting pipes:
For drum boilers, it is 3% of the drum pressure; for direct current boilers, it is 3% of the rated pressure. 4.8 The most severely worn pipe body of the vertical and pressure-bearing heating surface of the boiler tail that is washed by the ash-containing airflow shall be based on The annual loss rate is 0.2 mm/year, and the thickness of the pipe wall should have a wear allowance of 2 mm. The service life of the anti-wear plate in the local severe wear area should not be less than one overhaul cycle. 4.9 Appropriate measures should be taken for the layout of the superheater, reheater, and economizer tube rows to prevent local wear caused by flue gas leakage. The tube rows should be fixed reliably to prevent individual tubes from being out of the row.
4.10 The belly bearing capacity of the standard boiler and the modified design boiler is designed at ±3~4kPa during negative pressure combustion. 4.11 The boiler should be equipped with a sufficient number of safety valves, and its requirements should comply with the provisions of the "Regulations on Safety Technical Supervision of Steam Boilers". The safety valve is not allowed to refuse to move or return to its seat. Its take-off height meets the design value, and there is a safety width of auxiliary devices. The return seat pressure should not be greater than 7% of the take-off pressure.
4.12 Air preheater leakage system:
a, when using rotary air preheater, no more than 12%; b, when using tubular air preheater, the first-level layout is no more than 3%; the second-level layout is no more than 6%. 4.13 In order to prevent the wear of tubular air preheater, anti-wear pipes should be installed at the flue gas inlet of the pipe box, anti-magic should be adopted in the low-temperature section of the tubular air preheater, and the structure should be easy to replace.
4.14 The rotary air preheater should be equipped with a turning device, a full set of soot blowing and cleaning devices, and a peephole. 4.15 The rotary air preheater should be equipped with a porcelain device for adjusting the radial sealing gap. 4.16 The heat exchange element of the low-temperature section of the rotary air preheater should be made of corrosion-resistant materials when necessary, and the structure should be easy to repair and replace. 4.17 The deflection of the large plate beam of a suspended boiler shall not exceed 1/850 of the span, the deflection of the secondary beam shall not exceed 1/750 of its own span, the deflection of the general beam shall not exceed 1/500 of its own span, and the deflection of the supporting beam of the air preheater shall not exceed 1/1000 of its own span. 4.18 The arrangement of the platform escalator should be convenient for patrol inspection during operation. Platforms at the same level should be interconnected. The allowable load per square meter of the boiler platform shall not be less than 200N. The slope of the escalator is generally 45\. All platforms that need to be inspected by belts should adopt impermeable structures. 4.19 The sewage discharge rate of exhaust boilers using chemical desalination or distilled water as make-up water should not exceed the following regulations: equipped with condensing units: 1%;
equipped with heating units: 2%.
JB/T6696-93
4.20·When using open-air sintering, the boiler and its system equipment should have anti-freezing, anti-rain, anti-sand, anti-salt spray, anti-rust and other measures. 4.21 The furnace roof should adopt a metal sealing structure. The installation method of the furnace roof suspension rod should be explained in the installation instructions, and the installation connection diagram and the finished sealing plate should be provided to ensure that the suspension rod is properly stressed and the furnace roof is well sealed. ：：.--+ ..
4.22 The design of the cold ash hopper at the bottom of the boiler should adopt a good sealing structure that does not hinder the free expansion of the furnace body. The slag discharge equipment should be easy to operate and maintain, and should be safe, reliable, energy-saving and water-saving.
4.23 The structure of the burner should ensure stable combustion in the furnace without serious coking. The burner nozzle is made of high-temperature resistant material, and the burner with an adjustment device should be flexible and adjustable in the hot state. .4.24 When the burner and the water-cooled wall are combined by sliding, the normal relative expansion between the burner and the water-cooled wall should be ensured, and air leakage should be prevented. 4.25 The arrangement of the fire-viewing holes should be able to observe the ignition of the fuel at the outlet of each burner in the furnace, and a platform for observation and slagging should be arranged in the burner area. 4.26 The negative pressure measuring hole of the boiler furnace should generally be arranged 2 to 3 meters below the furnace top. In special circumstances, the corresponding negative pressure value should be specified when the position is changed.
4.27 The arrangement of the manhole door should facilitate maintenance personnel to enter each heating surface, and a platform for personnel to enter and exit should be provided. 4.28 The furnace should be equipped with a reserved hole for installing temporary lifting equipment during the internal maintenance of the furnace. The layout of the UP type direct current boiler mixer and the structural design of the water-cooled wall tubes, the inner diameter of the tubes and the manufacturing tolerances should meet the requirements of the temperature difference between the tubes for the strength of the connection between the water-cooled walls. The water-cooled wall should be equipped with a throttling diagram and should be easy to check and replace during maintenance. 4.30 The hydraulic deviation calculation and reasonable selection of thermal deviation coefficients should be carried out for each section of the superheater and reheater, and the tube temperature calculation should be carried out accordingly. The outlet steam temperature deviation on both sides of the superheater and reheater should be less than 15°C, and the smoke temperature difference on both sides of the tail turning smoke chamber should not exceed 50°C. 4.31
The calculated overall temperature of the superheater and reheater of each section is lower than the allowable temperature value of the strength calculation. 4.32
4.33 The calculated control index of the outlet temperature of the medium of each section of the superheater, reheater and serpentine tube shall be provided, and the temperature measurement point layout diagram or measurement point layout description shall be provided.
3.34 The temperature control device of the superheater and reheater shall be durable, and the temperature adjustment range shall reach the design value. 4.35 In order to avoid thermal fatigue cracks near the downcomer tube holes, water inlet tube holes and recirculation tube holes of the boiler, reasonable tube hole structure type and water distribution method shall be adopted.
4.36 The internal device of the boiler drum shall be tight and fixed reliably, and the finger of the cyclone separator shall be firmly fixed to the base to prevent falling off. The boiler shall have the socket interface required for the high and low water level alarm device, and the boiler emergency drain pipe shall be installed, and its inlet shall be close to the normal water level. 4.37
The boiler water level gauge shall be safe and reliable, easy to observe and indicate correctly. The steam pipe from the superheater outlet header to the steam header should be checked for thermal compensation stress. The drum and header should be equipped with pipe seats for chemical cleaning, superheater backwashing and shutdown protection. The structure and layout of each main heating surface should be convenient for maintenance, and the layout of the desuperheater should be convenient for oil core. The heating parts of the boiler should be guaranteed to expand freely in the direction specified by the design. The feed water regulating valve and the desuperheating water regulating valve should have good adjustment characteristics. The joints of the sewage pipe, drain pipe, air pipe, heating pipe and sampling camp should use the welding type of reinforced structure. 4.44
The boiler should be equipped with necessary soot blowing equipment according to the characteristics of the fuel, and its steam source shall be determined by the manufacturer. The telescopic long ash blower, safety valve, and air exhaust pot should be equipped with a maintenance platform. During the operation of the furnace, the furnace, preheater and air duct are not allowed to have abnormal vibration, and the furnace body of the induction hanging boiler is not allowed to have abnormal movement. 4.47
The materials used for boiler pressure-bearing parts, alloy suspension rods and main load-bearing structures shall comply with national or Ministry of Metallurgy standards, and the conditions of use shall be consistent with the grade of the materials supplied by the enterprise. All alloy steel materials used shall be subjected to optical harmonic analysis. When foreign steel is used, its scope of use and process requirements shall comply with the specifications provided by foreign companies and be filed with the Ministry of Labor. 4.49 The butt welds of manually welded pipes shall be primed with oxygen arc welding, and the fillet welds shall be primed with hydrogen arc welding as much as possible, and shall be inspected according to the corresponding specifications. The welding of dissimilar steels with large differences in welding properties in boiler pressure-bearing parts shall be carried out in the manufacturer. All butt welds of boiler shells and axial butt welds of headers shall be inspected by 100% ultrasonic flaw detection plus at least 25% radiographic flaw detection. 4.51
JB/T 6696-93
100% radiographic or ultrasonic flaw detection is required for the centralized downcomer socket and safety lubrication socket. 4.52 Before leaving the factory, the boiler equipment shall ensure its finished product, integrity and completeness in terms of process system, scope of supply, accessories and fittings. When transportation conditions permit, the complete parts shall be assembled in the factory to the maximum extent possible, and adjustment, leveling and testing shall be carried out. 4.53 Before leaving the factory, the boiler steel frame connected by high-strength bolts shall be assembled in sections. Under the premise of ensuring the accuracy of its external dimensions, the connection bolt holes shall be finely processed. Before leaving the factory, the boiler steel frame assembled by welding shall control the size of the main column and beam of the section, and the groove size of the installation welding shall be prepared.
4.54 Before leaving the factory, the heating surface, external connection pipe joints, and header pipe joints of the boiler should be welded with grooves, the oxide scale inside and outside the pipe joints should be removed, and anti-corrosion coating should be applied and plugs should be installed, while ensuring the overall dimensions. 4.55 Before leaving the factory, the heating surface pipe row and components must pass the water pressure test and ball test. The debris and iron filings in the header should be cleaned and sealed with a strong cover.
4.56 The valve should meet the use conditions before leaving the factory, and the electric valve should be assembled and debugged before leaving the factory. 4.57 Before leaving the factory, the membrane wall should be assembled or assembled in sections in the factory, and the overall dimensions should be guaranteed. Before leaving the factory, the rotary air preheater should be assembled and tested according to the provisions of JB2638. 4.58
The soot blower and ignition device should be debugged and qualified before leaving the factory. b.
Boiler high and low water level protection;
Main steam overpressure protection;
Reheat steam overpressure protection:
Reheat steam overtemperature protection;
Supply and suction fan full trip protection;
Furnace positive and negative pressure protection:
DC boiler water cut-off protection;
1. Manual emergency stop button.
JB/T6696-93
For other aspects that hinder safe operation not listed above, such as auxiliary machine interlock, etc., corresponding protection measures should also be provided. The boiler chemical cleaning system should be determined and the necessary cleaning equipment should be configured. 6.13
The necessary connecting pipes, sealing plates and valves for boiler water pressure test flushing pipes should be equipped. 6.14
7 Boiler installation
7.1 The installation of the boiler should be undertaken by an approved professional installation unit. 7.2 The installation of boilers shall meet the requirements of Article 3.5. 7.3 During installation, boiler installation and construction shall be carried out in accordance with relevant regulations, drawings, technical documents, installation instructions, etc. During installation, if the equipment needs to be modified, the consent of the manufacturer must be obtained. 7.4 During boiler installation, if the materials of pressure-bearing bulky parts need to be replaced, the consent of the design and manufacturing units shall be obtained and the formalities shall be handled according to the prescribed procedures. 7.5 Before installing boiler equipment, the installation unit shall conduct a random inspection of materials, welds, pipe diameters, water pressure, etc. in accordance with the provisions of DIJ52. 7.6 For newly designed boilers and boilers that are determined to require appraisal, the installation unit shall install them according to the appraisal test data issued by the competent unit, the measurement point layout diagram and the test elements provided by the relevant units.
7.7 During boiler installation, the furnace body, furnace top, convection flue and various door holes shall have good sealing performance. After installation, a wind pressure hysteresis test shall be carried out, and the test pressure shall be the working pressure of the furnace plus not less than 500Pa. 7.8 After the installation of the boiler is completed, the boiling, cleaning, pipe flushing, and trial operation shall be carried out in accordance with this standard and the relevant regulations or regulations of the Ministry of Energy and the relevant technical documents of the manufacturer.
7.9 After the installation of the boiler is completed, if it is not started for a long time due to storage, anti-freezing and anti-freezing protection measures should be taken. 8 Start-up, commissioning and operation
8.1 Before the boiler is put into operation, the operation rules of this boiler shall be compiled in accordance with the "Electric Power Industry Technical Management Regulations" of the Ministry of Energy and the relevant operation requirements and corresponding typical operation procedures provided by the manufacturer. 8.2 The whole set of startup, commissioning and operation of the boiler shall be carried out only after the boiling, pickling and pipe flushing of the vortex furnace have passed the acceptance, the main auxiliary machine trial operation is normal, and various protection and interlocking devices are put into use normally. 8.3 The operation of the boiler shall comply with the relevant provisions of the "Steam Boiler Installation Technical Supervision Regulations", "Electric Power Safety Work Regulations", "Boiler Operation Regulations" and the relevant technical documents of the manufacturer.
8.4 The quality of boiler feed water shall meet the requirements of boiler design. 8.5 The boiler shall be operated according to the furnace negative pressure value proposed by the manufacturer. 9 Boiler Acceptance
9.1 The quality of the parts of each boiler product must be inspected by the manufacturer's technical inspection department before it can leave the factory. 9.2 The on-site inventory and acceptance of boiler equipment shall be carried out in accordance with the boiler order contract. 9.3 The directly purchased parts (except for general standard parts and accessories) in the boiler matching should have a quality certificate from the purchased parts manufacturer, and the boiler maintenance factory shall be responsible for the quality of the purchased parts.
9.4 The first boiler of the newly designed boiler produced by the boiler factory shall be reported to the competent authority for boiler performance appraisal in accordance with the provisions of the "Management Measures for the Design and Trial Production of New Products of Machinery Industry Enterprises" issued by the former First Ministry of Machinery Industry in 1981. The appraisal results shall comply with the provisions of Article 4.2 of this standard. 9.5 Within one year of the commissioning of the boiler, the user shall organize various assessment tests and conduct final acceptance of the boiler. During the acceptance test, the manufacturer should participate and negotiate to solve the relevant problems in the test. The boiler acceptance test items are generally: boiler output and parameter measurement, boiler thermal characteristics and efficiency test; boiler steam and water quality measurement: air preheater leakage coefficient measurement; minimum fuel load test when the boiler is fully coal-fired: boiler start-stop characteristics test: new design boilers are tested separately; load increase and decrease speed test; superheated steam and reheated steam temperature deviation test. 9.6 For boilers with special requirements, additional acceptance test items should be indicated in the boiler technical agreement. 9.7 The coal used for boiler assessment should meet the design coal type. The guaranteed value of boiler thermal efficiency is based on the design coal type. The boiler should reach the rated evaporation capacity when the coal quality is within the allowable variation range in Table 1 and the auxiliary equipment meets the requirements. Table 1
Anthracite
Low volatile content bituminous coal
High volatile content bituminous coal
Note:?
Combustible basis volatile content
Nominal value
Permitted variation range of coal quality
Application ash storage
Part code difference
Deviation value
Apply gastric basis water
Part deviation value
When the volatile content of combustible matter is less than 8% anthracite, the allowable variation range of coal quality shall be negotiated separately. The minimum volatility of low-volatile bituminous coal shall not be less than 20%, and the application base low calorific value
nominal value
≥20S00
≥20800
≥16700
≥16700
≥12500
When the corresponding application base low calorific value of the above coal types is significantly lower than the value listed in the table, the deviation value shall be determined separately. 10 Technical data
When the boiler leaves the factory, the manufacturer shall provide the following drawings and data in a timely manner. a,
General catalog (general list) and packing list (delivery details list) of boiler parts, boiler quality guarantee:
Installation drawings required for boiler installation:www.bzxz.net
Boiler manual and installation, operation and maintenance key points. Each boiler shall have and provide the following calculation data to the user; 10.2
Summary table of boiler thermal calculation results;
Summary table of boiler steam-water resistance calculation results; Summary table of boiler smoke and air duct resistance and calculation results; Strength calculation sheet of pressure components;
Summary table of superheater and reheater tube wall temperature calculation data; Deviation value
±167c
±1670
±1670
±1670
Boiler thermal expansion system diagram;
Safety caliber calculation sheet;
JB/T6696-93
Newly designed boilers shall provide a summary table of boiler water dynamic calculation results separately. Provide water quality, water temperature, ambient temperature requirements for boiler shell water pressure test, shell upper and lower wall temperature and humidity difference control value and other information. Additional notes:
This standard is proposed and approved by the Ministry of Machinery Industry and the Ministry of Energy. This standard was developed by the Shanghai Power Generation Equipment Complete Design Institute of the Ministry of Machinery Industry and the Xi'an Thermal Engineering Institute of the Ministry of Energy.
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