JB/T 4358-1999 JB/T 4358-1999 Centrifugal blower and induced draft fan for power station boiler JB/T4358-1999 Standard download and decompression password: www.bzxz.net

JB/T 4358—1999
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Preface
This standard is a revision of JB4358--86 "Centrifugal Blower and Induced Draft Fan for Power Station Boilers". Compared with JB4358--86, the main technical content of this standard has changed as follows:
-In the scope, the "220t/h ~ 670t/h" value has been cancelled, making the standard applicable scope wider; - Modifications and additions Added some technical requirements; added requirements for product performance;
Modified the relevant content of test methods and inspection methods; --Added "5.5 Type testing of newly developed ventilators must be authorized by the state Only after the quality inspection agency passes the inspection can it be put into production. "
This standard will replace JB4358-86 from the date of implementation. This standard is proposed and coordinated by the National Fan Standardization Technical Committee. This standard was drafted by: Shenyang Blower Research Institute. The main drafters of this standard: Chen Mingliang, Zheng Hua, and Kong Guilan. 313
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Machinery Industry Standard of the People's Republic of China
Power station boiler centrifugal blower and induced draft fan
Centrifugal IF-FAN and ID-FAN for boiler of power station1 Scope
JB/T 4358-- 1999
Replaces JB4358-86
This standard specifies the centrifugal blower and air blower for power station boilers Technical requirements, test methods, inspection methods, marking, packaging and transportation of fans.
This standard applies to centrifugal blowers and induced draft fans (hereinafter referred to as supply and induced draft fans) of steam boilers in thermal power stations. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard through reference in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB/T1236—1985 Ventilator aerodynamic performance test method GB/T 10178—1988
GB/T 2888--1991
GB/T 13306-1991
JB/T 6444 -1992bzxz.net
JB/T 6445--1992
JB/T 6886—1993
JB/T 8689--1998
JB/T 9101-1999|| tt | |tt||Technical Conditions for Ventilator Painting
General Machine Vibration Detection and Limits
Balance of Ventilator Rotor
3.1 Send, the induced draft fan should comply with the requirements of this standard and be in accordance with Design and manufacturing shall be carried out based on the drawings, technical documents approved by the prescribed procedures and the technical agreements and contracts between the supply and demand parties.
3.2 The conveying medium of the air blower is air. Its designed inlet gas temperature is 20℃, the maximum allowed inlet gas temperature does not exceed 80℃, and the dust concentration of its medium does not exceed 100mg/m.
3.3 The input medium of the induced draft fan is flue gas, its design inlet temperature is 165C, the maximum allowed inlet gas temperature does not exceed 250℃, and the dust concentration of its medium does not exceed 200mg/m.
3.4 ??Under the specified flow rate, the corresponding full pressure deviation of the supply and induced draft fans is ±5%; the full pressure internal efficiency of the supply and induced draft fans shall not be less than 5% of the efficiency of their corresponding points, ||tt ||3.5 The wear resistance of the induced draft fan impeller should be considered and the clogging of the impeller flow path should be prevented. The blades of the induced draft fan impeller and the volute plate of the casing should be made of materials with good wear resistance. When the dust concentration of the medium meets the design requirements, the service life of the induced draft fan blades should be no less than 4000h, and the service life of the blower should be no less than 10000h.
The design life of 3.6 rolling bearings is not less than 30000h. 3.7 The bearing box of the induced draft fan should be designed with water cooling and no positive pressure in the bearing box. Approved by the State Machinery Industry Bureau on July 12, 1999 314
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JB/T4358—1999
3.8 There are no special requirements for the bearing temperature of delivery and induced draft fans. When operating, the bearing temperature rise (referring to the bearing) should not be higher than the ambient temperature by 40°C. 3.9 The spindle is designed as a rigid shaft, and its critical speed should be more than 1.25 times the maximum operating speed. 3.10 The gap between the air inlet of the supply and induced draft fans and the impeller inlet ring should comply with the requirements of the drawing, and the adjustment door should rotate flexibly. 3.11 The materials used in the supply and induced draft fans should comply with relevant standards and have material certificates. If there are special requirements, they can be stipulated in the contract between the supplier and the buyer.
3.12 The materials used in the rotor should undergo mechanical performance testing and non-destructive testing, and have qualified inspection certificates. 3.13 The materials selected for welding parts should have good weldability. 3.14 The surface of the welding seam of the welded parts should be smooth and flat, without cracks, slag inclusions, pores, lack of fusion and welding burrs. 3.15 After welding of rotating parts, the weld should be inspected externally or internally, and there should be no cracks. 3.16 Welders must pass the examination before they can weld rotating parts. 3.17 The painting of the ventilator should comply with the regulations of JB/T6886. 4 Test methods
4.1 The balance test of the impeller or rotor of the draft fan or induced draft fan shall comply with the provisions of JB/T9101. 4.2 The impeller of each blower and induced draft fan should be subjected to an overspeed test. The overspeed test method should comply with the provisions of JB/T6445. 4.3 The rotors of the blower and induced draft fans must undergo an operation test. The continuous operation test time shall not be less than 20 minutes after the bearing temperature rise stabilizes. When the ambient temperature is 0~40C, the bearing temperature rise shall not be greater than 40C, and the maximum bearing temperature shall not be greater than 80C. When the ambient temperature is lower than 0℃, it should be stipulated in the contract between the supplier and the buyer.
4.4 The vibration speed and limit values ??of the sending and induced draft fans shall comply with the provisions of JB/T8689. 4.5 The aerodynamic performance of the blower and induced draft fans should be tested in accordance with GB/T1236. 4.6 If the purchaser must test the aerodynamic performance and product noise of the product in the manufacturing plant or on site, the test methods and requirements should be stipulated in the technical agreement or contract and implemented in accordance with GB/T10178 and GB/T2888. 4.7 Test projects in the manufacturing plant should have test reports or records. 5 Inspection methods
5.1 For the first large-scale blower and induced draft fans produced for the first time, the first unit must undergo complete machine assembly inspection; other products can undergo complete machine assembly inspection according to the contract requirements.
5.2 Each blower and induced draft fan must pass the inspection by the technical inspection department of the manufacturer and be accompanied by a product certificate before leaving the factory. 5.3 The accompanying documents for each delivery and induced draft fan and the complete set of supplied equipment shall be checked and accepted by the technical inspection department of the manufacturer according to the detailed list. 5.4 The demander can supervise the production of the supply and induced draft fans and participate in part or all of the test and acceptance. The test and acceptance items, dates and related economic matters that the demander participates in shall be stipulated in the contract between the supplier and the buyer. 5.5 The newly developed ventilator prototype must pass the type test by a state-authorized quality inspection agency before it can be identified and put into production. 6 Complete supply and quality guarantee period
6.1 Delivery, complete supply scope of induced draft fans and the items and quantities of spare parts shall be stipulated in the contract by both the supplier and the buyer. 6.2 Under the conditions that the purchaser complies with the regulations on the storage, transportation, installation and use of the blower and induced draft fans, the quality guarantee period of the blower and induced draft fans, the cumulative operating time since the first operation: the blower shall not be less than 12000h, and the induced draft fan shall not be less than 12000h. Not less than 8000h. However, the maximum period shall not exceed 18 months from the date of delivery. During the warranty period, if the supply and induced draft fans are damaged or fail to work properly due to manufacturing quality, the supplier shall repair or replace parts for the demander free of charge.
7 Logo, Packaging and Transportation
7.1 Logo
7.1.1 The induced draft fan should have a sign in a prominent position, and its content should include the name, model, performance, product number, Rotation speed, motor power, 315
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JB/T4358—1999
Manufacturing date and manufacturer, etc.; the direction of rotation mark should be added to the casing of the sending and induced draft fans to prevent the impeller from Anti-loaded. The impeller adjustment door should have adjustment marks. 7.1.2 The size and technical requirements of the supply and induced draft fan signs shall comply with the provisions of GB/T13306. 7.2 Packaging and transportation
7.2.1 The exposed and unpainted work surfaces of the induced draft fan parts must be coated with an anti-rust layer, and appropriate protective covers must be added when necessary. 7.2.2 The fan is allowed to be in simple packaging, but the motor, instrument and coupling must be waterproof and shockproof. 7.2.3 Random documents should be placed in moisture-proof packaging bags. 7.2.4. The packaging of the product should comply with the regulations of JB/T6444, and should comply with the relevant regulations on waterway, highway, railway and other transportation. 316
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