Boiler thermal state sliding-parameter shutdown method
A sliding parameter and boiler technology, which is applied in the field of boiler thermal sliding parameter shutdown, can solve problems such as waste of power resources and affect normal production, and achieve the effect of reducing cooling and saving shutdown time.
Active Publication Date: 2014-12-31
NANJING IRON & STEEL CO LTD
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Problems solved by technology
In this normal shutdown mode, it takes 24 hours for the shutdown time to drop to the temperature suitable for boiler maintenance, which not only wastes power resources seriously, but also affects normal production
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[0016] A method for shutting down a boiler with sliding parameters in thermal state, the specific steps of the method are as follows:
[0017] 1) After the generator set is shut down, when the boiler drum pressure drops to 11.3MPa and the drum wall temperature drops to 320 degrees, the boiler does not shut down immediately, and the combustion volume is controlled at 15%. Open the opening of the secondary door of the boiler to the empty discharge to ensure that the exhaust steam of the boiler is 30t / h, and at the same time adjust the opening of the secondary door of the boiler to the empty discharge to control the cooling speed of the steam drum to ensure that the cooling rate is 1°C / min ;
[0018] 2) After 2 hours and 20 minutes, when the boiler drum temperature drops to 180°C and the pressure drops to 0.8MPa, turn off the boiler; after the turn off, the boiler will directly discharge water under pressure;
[0019] 3) After the boiler water is exhausted, it is cooled by natur...
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The invention discloses a boiler thermal state sliding-parameter shutdown method. After a power generating set is stopped, when the boiler drum pressure and drum wall temperature drop to a preset value, the boiler is not shut down immediately and faces to the non-load primary surface, the opening degree of a non-load atmospheric relief secondary door of the boiler is slightly opened, the exhaust volume of the boiler is ensured to be 30t / h, meanwhile, the opening degree of the non-load atmospheric relief secondary door of the boiler is adjusted to control the cooling rate of the boiler drum, and the cooling rate is ensured to be 1 DEG C / min; when the temperature of the boiler drum reaches 180 DEG C, and the pressure drops to 0.8 MPa, the boiler is shut down; the boiler is directly subjected to water drainage under pressure; the water in the boiler is completely drained, and the boiler is subjected to natural air cooling; an induced draft fan is started to carry out enforced cooling after the temperature of the boiler drum is lower than 100 DEG C, and then the shutdown maintenance work can be carried out. With the adoption of the method, the cooling and pressure reduction time of the generating set can be greatly shortened, the shutdown maintenance time is shortened, maintenance operating conditions are provided for the boiler equipment maintenance in a short time, and the power generation benefit of the generating set is improved.
Description
technical field [0001] The invention belongs to the application field of power station boilers, and in particular relates to a method for shutting down a boiler with a sliding parameter in thermal state. Background technique [0002] At present, when the boiler is scheduled to be shut down for maintenance, it takes a long time for the boiler to be shut down to reduce the temperature and pressure. figure 1 It is the cooling curve of the boiler under normal working conditions, in which: part A1 is the natural exhaust steam cooling method, part A2 is water discharge under pressure, part A3 is natural cooling, and part A4 is forced cooling. figure 2 It is the depressurization curve of the boiler under normal working conditions, in which: part B1 is natural exhaust steam depressurization, part B2 is water discharge under pressure, part B3 is natural cooling, and part B4 is forced cooling. In this normal way of shutting down the boiler, it takes 24 hours for the shutdown time to...
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IPC IPC(8): F22B35/00
Inventor 陈双龙
Owner NANJING IRON & STEEL CO LTD