Method for controlling main steam desuperheating water of unit

A control method and technology of desuperheating water, which are applied in the control of superheated temperature, steam superheating, steam generation, etc., can solve the problems of overheating of the main steam temperature and the failure of automatic tracking of the desuperheating water valve, so as to avoid the tripping. Effect

Active Publication Date: 2021-07-09
HANGZHOU HUADIAN BANSHAN POWER GENERATION
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a control method of the main steam desuperheating water of the unit, which is used to solve the problem in the prior art that the main steam temperature rises too fast, and the desuperheating water valve cannot automatically track, which leads to the main steam temperature overheating and tripping

Method used

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  • Method for controlling main steam desuperheating water of unit

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Embodiment Construction

[0029] 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 with reference to the accompanying drawings.

[0030] Such as figure 1 As shown, a control method of the main steam desuperheating water of the unit, the control method of the main steam desuperheating water of the unit includes the following steps:

[0031] S1: When the unit starts, set the open-loop logic according to the unit load, gas turbine exhaust temperature and main steam temperature;

[0032] S2: Determine whether the condition of the unit meets the open-loop logic, and if so, actively control the desuperheating water electric valve and desuperheating water regulating valve according to the open-loop logic;

[0033] S3: After triggering the open-loop logic, turn on the light plate alarm device to remind the operation and maintenance personnel;

[0034] S4: After t...

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Abstract

The invention discloses a method for controlling main steam desuperheating water of a unit. The method comprises the following steps that S1, when the unit is started, open-loop logic is set according to the load of the unit, the exhaust temperature of a gas turbine and the temperature of main steam; S2, whether the unit condition meets the open-loop logic or not is judged, and if yes, a desuperheating water electric valve and a desuperheating water adjusting valve are actively controlled according to the open-loop logic; S3, after the open-loop logic is triggered, and an annunciator panel alarm device is started to remind operation and maintenance personnel; and S4, after the unit is started, whether the load is stable or not is judged, and if the load is stable, the main steam desuperheating water adjusting valve is controlled through a PID closed loop. According to the method, in the starting process of the unit, the novel method for controlling the main steam desuperheating water adjusting valve and the electric valve is provided, it is guaranteed that the main steam desuperheating water adjusting valve can be opened in time in the starting process of the unit, and the tripping phenomenon caused by main steam overtemperature of the unit is avoided.

Description

technical field [0001] The invention relates to the field of gas-fired units, in particular to a method for controlling the main steam desuperheating water of the unit. Background technique [0002] In the invention patent application document with the patent number CN201310313739.3, it is mentioned that the boiler superheated steam temperature is one of the most important parameters affecting the safety and economy of the boiler production process, and the superheated steam temperature is too high to cause the metal temperature to be too high Increased creep expansion reduces pipe life, and frequent overheating can lead to superheater pipe overheating and bursting. [0003] At present, the main steam temperature of the 9FA gas-steam combined cycle unit needs to be controlled by desuperheating water. During the normal operation of the unit, the automatic tracking of the desuperheating water regulating valve can be realized through PID control. However, during the start-up p...

Claims

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Application Information

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IPC IPC(8): F22G5/12
CPCF22G5/123Y02E20/16
Inventor 方炜郑迎九潘小丰吴文董易闻庞向阳炊健丁勇能章俊华
Owner HANGZHOU HUADIAN BANSHAN POWER GENERATION
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