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Exhaust steam pressure control system and method for direct air cooling unit

An air-cooled unit and exhaust pressure technology, which is applied to steam/steam condensers, lighting and heating equipment, etc., can solve the problems of steam turbine exhaust pressure fluctuations and long stabilization times, and achieve increased follow-up speed, elimination of thermal inertia, and improved Effects of Controlling Stability and Rapidity

Active Publication Date: 2020-06-19
SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The inventor found that the direct air-cooling unit controls the exhaust pressure of the steam turbine through the change of the speed of the air-cooling fan. The control method currently used has hysteresis, especially when the load of the unit changes rapidly, the exhaust pressure of the steam turbine fluctuates greatly and the stabilization time is long

Method used

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  • Exhaust steam pressure control system and method for direct air cooling unit
  • Exhaust steam pressure control system and method for direct air cooling unit
  • Exhaust steam pressure control system and method for direct air cooling unit

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Embodiment 1

[0035] In a typical implementation of the present application, such as image 3 , Figure 4 As shown, the control method proposed by the present invention selects the load real-time value Pw and the load command Pw in the unit DCS system ins , Medium load command Pw dis-ins , grid frequency deviation signal ⊿f and heating extraction steam flow (heating unit) G heat ; Then after calculation, the air-cooled island steam intake change signal ⊿G is obtained ac , ⊿G ac = α 1 (Pw ins -Pw)+α 2 (Pw dis-ins -Pw)+α 3 ⊿f-β 1 G heat , where α 1 , α 2 , α 3 and beta 1 is the fitting coefficient. The air-cooled island steam intake change signal ⊿Gac is used as a feed-forward signal for back pressure control. The PID control system predicts the change trend of the air-cooled island steam intake in advance, and adjusts the fan control command according to this change trend. By changing the speed of the fan in advance, the change of the speed of the fan is synchronized with the...

Embodiment 2

[0039] This embodiment also proposes a direct air-cooling unit exhaust pressure control system based on unit load variation trend, as follows:

[0040] An acquisition module, the signal acquisition device acquires the real-time value of the load in the DCS system of the unit, the load command, the mid-load load command, the grid frequency deviation signal and the heating and extraction flow;

[0041] The data processing device performs arithmetic processing on the received signal to obtain the change signal of the air-cooled island steam intake, and sends the air-cooled island steam intake change signal as the feed-forward signal of the air-cooled fan back pressure control to the air-cooled fan back pressure controller ;

[0042] The air-cooling fan back pressure controller predicts the change trend of the air-cooling island's steam intake in advance, and adjusts the air-cooling fan control command according to this change trend.

[0043] The signal acquisition device in this...

Embodiment 3

[0046] This embodiment discloses a controller, which includes a memory, a processor, and a control program that is stored on the processor and can run on the processor, and the control program is configured to implement the control program in Embodiment 1. The steps of the control method.

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Abstract

The invention discloses an exhaust steam pressure control system and method for a direct air cooling unit. The method comprises the steps of selecting real-time load values, load instructions, medium-regulating load instructions, grid frequency deviation signals and heat supply and steam extraction flow of a heat supply unit in the DCS of the unit; obtaining air cooling island steam admission flowvariation signals after operation is conducted; and regarding the air cooling island steam admission flow variation signals as feedforward signals of backpressure control, pre-judging the variation trend of the air cooling island steam admission flow in the control system, and adjusting the draught fan control instruction in accordance with the variation trend. According to the exhaust steam pressure control system and method, by changing the rotation speed of a draught fan in advance, the change of the rotation speed of the draught fan and the variation of the air cooling island steam admission flow are synchronized, and thus the effect that the actual value of exhaust steam pressure is stable is achieved.

Description

technical field [0001] The invention belongs to the technical field of optimization control of direct air-cooling systems in power plants, and in particular relates to a direct air-cooling unit exhaust pressure control system and method based on unit load variation trends. Background technique [0002] Exhaust steam pressure is an important parameter affecting the efficiency and output of steam turbines. Minor changes will affect the output and efficiency of steam turbines. The reduction of exhaust pressure will cause greater enthalpy drop of steam in steam turbines and provide greater working capacity. . [0003] The condenser is a cooling device for the exhaust steam of the steam turbine, which reduces the pressure of the exhaust steam of the steam turbine through the cooling effect. The quality of cooling capacity and performance determines the level of steam turbine exhaust pressure. [0004] Direct air cooling system is currently a commonly used steam turbine exhaust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28B11/00
CPCF28B11/00
Inventor 刘晓玲梁涛尹晓东邵旻王斐张力薛广伟陈志强卢伟王智丁利张冰李炜
Owner SHANDONG ELECTRIC POWER ENG CONSULTING INST CORP
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