This standard specifies the technical requirements, test standards, acceptance rules, manufacturing, installation, packaging, marking and random delivery of black liquor alkali recovery boilers (hereinafter referred to as alkali recovery boilers). This standard applies to fixed black liquor alkali recovery boilers with water as the medium in the papermaking industry. JB/T 6510-1992 Technical conditions for black liquor alkali recovery boilers JB/T6510-1992 Standard download decompression password: www.bzxz.net

1 Subject content and scope of application
Machinery Industry Standard of the People's Republic of China
Technical conditions for black liquor alkali recovery boiler
JB/T651092
1.1 This standard specifies the technical requirements, test standards, acceptance rules, manufacturing, installation, packaging, marking and random documents of black liquor alkali recovery boilers (hereinafter referred to as alkali recovery boilers). 1.2 This standard applies to fixed black liquor alkali recovery boilers with water as the medium in the papermaking industry. 2 Reference standards
5 Technical conditions for boiler paint and packaging
JB/T1615
GB3323
GB2106
GB10863
SDJ245
Radiography and quality classification of steel fusion welded butt jointsMetal Charpy (V-notch) impact test methodThermal test method for flue-type waste heat boilers
Water vapor quality standard for thermal power plants
Technical specification for construction and acceptance of power construction (boiler unit section)Crushing and grinding equipment, winch, fixed dieselTJ231 (VI) Technical specification for construction and acceptance of mechanical equipment installation engineering (Volume 6 Oil machine, industrial boiler installation
3 Terminology
3.1 Black liquor solids (black liquor absolute dry matter)
The solids obtained by concentrating and drying black liquor so that it does not contain water are called black liquor solids or black liquor absolute dry matter. 3.2 Glauber's salt reduction rate
The ratio of sodium sulfide to the sum of sodium sulfide and sodium carbonate in the molten material (i.e. Na,sNa,SONa,s
3.3 Magnetic recovery rate
3.3.1 System recovery rate
×100%) is the Glauber's salt reduction rate.
In the case of no supplementation of Glauber's salt, the amount of alkali recovered from cooking accounts for the percentage of alkali used for cooking. 3.3.2 Alkali recovery rate in combustion section
In the case of no supplementation of Glauber's salt, the amount of alkali recovered in the combustion section accounts for the percentage of alkali contained in the black liquor sent to the combustion section by evaporation Number. 3.3.3 Twin-tube membrane wall
refers to a membrane tube group made of two bare tubes with a shoulder steel welded in the middle. 4 Technical requirements
4.1 Conditions of use
4.1.1 The composition and properties of the liquid entering the furnace shall be consistent with the requirements of the design (or order technical task book). 4.1.2 Alkali boiler users shall carry out safety and technical management in accordance with the relevant requirements of the "Regulations on Safety Technical Supervision of Steam Boilers". 4.1.3 The quality of alkali boiler feed water shall comply with the provisions of Table 1. Approved by the Ministry of Machinery and Electronics Industry on December 21, 1992bzxZ.net
Implementation on May 1, 1993
Rated steam pressure
≥>1.27<3.82
4.2 Performance
JB/T65 10—92
4.2.1 The alkali furnace shall ensure the black liquor solid processing capacity and steam parameters under the design conditions. 4.2.2 When the calorific value and water content of the black liquor solids fed into the alkali furnace meet the requirements of Table 2, the mirabilite reduction rate and alkali recovery rate of the alkali furnace shall be guaranteed. Table 2
Black liquor solid calorific value
Black liquor variety
Wood pulp black liquor
Leather straw pulp black liquor
Wheat straw pulp black liquor
~15100
~13400
~12560
Water content of black liquor entering the furnace
Mirabilite reduction rate
4.2.3 Under the rated output of the alkali furnace, the steam quality of the alkali furnace shall meet the following requirements: a.
Execution).
The steam humidity of saturated steam alkali boiler is not more than 3%; recovery rate
Venturi system
Electrostatic precipitator system
Alkali boiler for power generation. The quality of superheated steam shall comply with SD163 (the rated steam pressure of the alkali furnace <3.82MPa shall be in accordance with the provisions of 3.82MPa. 4.2.4 The temperature deviation of superheated steam in the alkali furnace shall not exceed the following provisions: when the superheated steam temperature is 300℃, it is ℃; when the superheated steam temperature is 350℃, it is soil 20; when the superheated steam temperature is 400℃, it is ℃; when the superheated steam temperature is 450℃, it is ℃. 4.3 Manufacturing technical requirements:
4.3.1 The manufacture of the main components of the alkali furnace shall comply with the relevant provisions of the corresponding standards. 4.3.2 Broken furnace products shall be manufactured strictly in accordance with the drawings and technical documents approved by the prescribed procedures. 4.3.3 The manufacture of the pin tube, membrane economizer, plate superheater, and twin-tube membrane tube wall of the alkali furnace shall be manufactured before there are professional standards. Corresponding enterprise standards should be formulated to ensure product quality. 4.3.4 Pin pipes must be 100% inspected by endoscopy after welding. When a new process is adopted and approved by the factory's chief technical investor, endoscopy inspection may be less or exempted.
4.3.5 Butt welds of water-cooled wall tubes and water-cooled screen tubes in the alkali furnace chamber (including welds installed on site). 100% radiographic inspection should be carried out. 4.3.6 For butt welds of heating surface tubes outside the furnace chamber, the number of inspections by radiographic or ultrasonic testing shall be 2% to 5% of the number of joints. 4.3.7 Radiographic inspection shall comply with the provisions of GB3323. The quality requirements of radiography shall not be lower than AB grade, and the quality of butt welds shall not be lower than I grade to be qualified.
4.3.8 Welded joints of boiler shells, headers and butt pipes, such as wall thickness Greater than or equal to 12mm (single-sided weldment thickness greater than or equal to 16mm). Impact specimens of three welded joints should be taken from the inspection specimen. Sample preparation shall be in accordance with the provisions of GB2106. The acceptance criteria for test temperature and impact energy shall be in accordance with Table 3.
Material name
Carbon steel (including low alloy steel)
JB/T6510—92
Test temperature
≤50+2
≤50+2
Impact energy
4.4 The alkali furnace manufacturing unit shall be responsible for the quality of product manufacturing. The design unit shall be responsible for product performance. Under the condition that the user complies with this standard and relevant technical documents, within 30 months from the date when the last batch of parts of the alkali furnace leaves the factory or 1 month from the date of formal operation. Within 8 months (factory period exceeds 30 months, and operation period is less than 18 months. The factory period shall prevail; factory period is less than 30 months. Operation period exceeds 18 months, operation period shall prevail). If damage is caused by design or manufacturing reasons. If it cannot operate normally according to performance parameters, the design unit or manufacturing unit shall handle it in accordance with the "Industrial Product Quality Responsibility Regulations" issued by the State Council. 4.5 The supply model letter of the alkali furnace and its ancillary equipment shall be agreed upon by the manufacturer and the user. 4.6 The installation of the alkali furnace shall be carried out in accordance with the installation drawings and relevant technical documents provided by the manufacturing or design unit. In addition, when the rated steam pressure is greater than 2.45MPa, it shall comply with the relevant provisions of SDJ245, and when the rated steam pressure is less than or equal to 2.45MPa, it shall comply with the relevant provisions of TJ231 (VI).
5 Testing, identification, acceptance
5.1 New trial-produced alkali furnace products should generally undergo thermal tests and alkali-sulfur balance determination after 3 months of normal operation. Thermal tests shall be carried out in accordance with the provisions of GB10863.
5.2 New trial-produced alkali furnace products must be appraised. Products that have not been appraised or have failed the appraisal shall not be mass-produced. The appraisal content shall include product performance, safety and manufacturing technical requirements. The technical documents for appraisal include: a.
General drawing and main component drawing of alkali furnace,
Quality inspection report of main pressure-bearing components (drum, header, pipe); trial-production appraisal outline;
Thermal test report and alkali and sulfur balance test report; Standardization review report;
Strength calculation sheet of pressure-bearing components;
Safety emission calculation sheet of alkali furnace;
Thermal calculation data of alkali furnace:
Trial-production summary (including design and process);
User usage report.
5.3Each alkali furnace shall be inspected and qualified before it can leave the factory. The manufacturer shall provide "Product Quality Certificate" (including factory certificate, metal material certificate, welding quality certificate and water pressure test certificate). 5.4 The user has the right to conduct acceptance according to the provisions of this standard. If any manufacturing quality problems are found, they should be promptly reported to the manufacturer, who should solve them properly.
6 Paint, packaging, marking and random documents
The paint and packaging of the alkali furnace should be carried out in accordance with the provisions of JB/T1615. The alkali furnace should be equipped with a fixed metal nameplate in a conspicuous position, and the content should at least include: 6.2
Alkali furnace model:
Factory number;
Daily solid processing capacity. t/d;
Rated evaporation position. t/h;
Rated steam pressure, MPa
Rated steam temperature, ℃;
Manufacturer name;
License level;
License number:
Date of manufacture.
JB/T6510-92
At least the following drawings and technical documents should be provided when the alkali boiler product leaves the factory: a.
Furnace total list;
Packing list;
Alkali boiler general plan, installation plan and main pressure parts plan; Pressure component strength calculation sheet:
Safety emission calculation sheet;
Thermodynamic calculation summary sheet;
Installation and operation instructions;
Pressure component design change notice;
Product quality certificate.
Additional notes:
This standard was proposed and managed by Hangzhou Waste Heat Boiler Research Institute. This standard was drafted by Wuhan Boiler Factory. The drafters of this standard are Luan Xiuzhen and He Zhenkang.
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