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Sliding parameter shutdown method for gas-steam combined cycle unit

A combined cycle unit and sliding parameter technology, applied in steam engine installations, machines/engines, mechanical equipment, etc., can solve the problems of reducing the benefit of gas-steam combined cycle units, long time consumption, etc., reducing operation and maintenance costs, and easy operation. , the effect of improving efficiency

Inactive Publication Date: 2015-07-01
福建晋江天然气发电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally speaking, it takes about 7 days to stop the car, which takes a long time and reduces the efficiency of the gas-steam combined cycle unit

Method used

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  • Sliding parameter shutdown method for gas-steam combined cycle unit

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Embodiment Construction

[0027] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described in detail with reference to the accompanying drawings.

[0028] like figure 1 As shown, the preferred embodiment of the present invention provides a method for shutting down the gas-steam combined cycle unit with slip parameters, which is used to speed up the shutdown time and improve the efficiency of the gas-steam combined cycle unit. The gas-steam combined cycle unit includes a gas turbine 1, a steam turbine 2, a waste heat boiler 3 and a generator (not labeled). The gas turbine 1, the steam turbine 2, the waste heat boiler 3 and the generator are common structures in the prior art, and the connection mode between the gas turbine 1, the steam turbine 2, the waste heat boiler 3 and the generator is also the prior art, and will not be repeated here repeat.

[0029] Specifi...

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Abstract

The invention discloses a sliding parameter shutdown method for a gas-steam combined cycle unit. The sliding parameter shutdown method comprises the following steps that S1, auxiliary steam is switched into the gas-steam combined cycle unit for medium pressure steam supply; S2, the load of the gas-steam combined cycle unit is reduced to 150 MW, and the opening degree of a high-pressure attemperation water regulating valve and a reheating attemperation water regulating valve is controlled, so that the temperature of high-pressure main steam and the temperature of reheated steam range from 540 DEG C to 545 DEG C; S3, the load of the gas-steam combined cycle unit is reduced to 140 MW, and a medium-pressure steam combining valve and a low-pressure steam inlet valve are closed manually. The method has the advantages that the sliding parameter shutdown method is utilized, the metal temperature of a steam turbine (2) is reduced to 371 DEG C from 530 DEG C at the normal shutdown moment, the time of shutting down a jigger is shortened to four days from the normal shutdown time of seven days, and the benefits of the gas-steam combined cycle unit are greatly improved.

Description

technical field [0001] The invention relates to the technical field of power generation in power plants, and more specifically, to a method for stopping a gas-steam combined cycle unit with a sliding parameter. Background technique [0002] The gas-steam combined cycle unit consists of gas turbine, steam turbine, waste heat boiler and generator. The gas turbine, steam turbine and generator are controlled by the MK VI system provided by GE, and the waste heat boiler and auxiliary equipment are controlled by the distributed control system (DCS) provided by Westinghouse Emerson. Specifically, the gas turbine consists of an 18-stage axial flow compressor, a combustion system consisting of 18 low NOx burners, a 3-stage turbine and a gas turbine auxiliary system. The steam turbine model is #158 (D10 optimization type), which is a three-pressure, one-time intermediate reheat, single-shaft, double-cylinder double-exhaust steam, (impulse type without extraction) pure condensing unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01K13/02
Inventor 肖永奖李德兵李肇宇丘蔚锋王路范伟强李东伟
Owner 福建晋江天然气发电有限公司
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