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Method for controlling steam supply pressure of heat supply network of thermal power plant

A technology of a thermal power plant and a control method, which is applied in the field of steam supply pressure control of a thermal power plant heating network, can solve problems such as low-flow erosion of valve cores, achieve low-flow erosion reduction, stable control, and flexible operation modes Effect

Active Publication Date: 2018-07-06
HUANENG POWER INT INC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this state, the spool of the second modulating valve suffers from low flow erosion

Method used

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  • Method for controlling steam supply pressure of heat supply network of thermal power plant
  • Method for controlling steam supply pressure of heat supply network of thermal power plant
  • Method for controlling steam supply pressure of heat supply network of thermal power plant

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Embodiment

[0033] In the present invention, two heating units are set to supply steam to the heating network through two regulating valves. In order to solve the disadvantages of the prior art, the steam supply of the two units has a primary or secondary or sequence, and a main control and auxiliary control control method is proposed. .

[0034] The steam inlet regulating valve of the sub-cylinder is set as one main control automatic and one auxiliary control automatic. The main control and auxiliary control regulating valves can be set freely.

[0035] When the steam consumption on the user side is low, the steam consumption of the user can be met by adjusting the main control valve, and the pressure of the sub-cylinders can be kept stable.

[0036] When the steam consumption on the user side increases, the opening of the valve is adjusted through the main control to keep the pressure of the sub-cylinder stable. Such as figure 2 As shown, when the steam consumption on the user side ...

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Abstract

The invention relates to a method for controlling the steam supply pressure of a heat supply network of a thermal power plant. The method includes the following steps that 1, a main control heat supply unit pipeline and an auxiliary control heat supply unit pipeline of a branch steam cylinder in a steam supply system of the heat supply network of the thermal power plant are set and connected in parallel, the main control heat supply unit pipeline is provided with a main control adjusting valve, and the auxiliary control heat supply unit pipeline is provided with an auxiliary control adjustingvalve; 2, a first opening degree limit value and a second opening degree limit value of the main control adjusting valve are set to be A% and C% respectively, and a third second opening degree limit value of the auxiliary control adjusting valve is set to be B%. The control method combining main control with auxiliary control is used for controlling the opening degree of the main control adjustingvalve and the opening degree of the auxiliary control adjusting valve, and the pressure of the branch steam cylinder is controlled. Compared with the prior art, the method has the advantage that low-flow erosion is prevented, automatic control is achieved, operation modes are flexible, and the stability is improved.

Description

technical field [0001] The invention relates to the field of steam supply control of a thermal power plant, in particular to a method for controlling the steam supply pressure of a heating network of a thermal power plant. Background technique [0002] Such as figure 1 As shown, the heating network steam is provided by extraction steam of four units, and enters the sub-cylinders through independent regulating valves CV1, CV2, CV3, and CV4 respectively, and provides them to different users. Under normal circumstances, steam is supplied by two units, and the steam supplied by the other two units is in a standby state. When the heat network system is running, if the two regulating valves are turned on automatically (each regulating valve is an independent PID regulation-proportional, integral and differential regulation), the two regulating valves will affect each other, causing the regulating valves to move continuously, and there may be some One valve is opened large, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24D19/10
CPCF24D19/1003
Inventor 马浩肖玲玲陈纲张琼叶秋平周泉
Owner HUANENG POWER INT INC
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