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Nonlinear condensation water throttle control model

A condensate throttling and nonlinear model technology, applied in the direction of control of water supply, preheating, steam generation, etc., can solve the problems of complex model structure, unfavorable controller design, etc., and achieve good performance

Inactive Publication Date: 2017-09-15
ZHEJIANG GONGSHANG UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

If all the low-pressure cylinder preheaters are put into the condensate throttling control model, then the model structure will be very complicated, which is not conducive to the controller design

Method used

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Embodiment Construction

[0032] The above and other technical features and advantages of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them.

[0033] Such as figure 1 As shown, a nonlinear condensate throttling control model includes the following steps:

[0034] S101: Establish a model about the total mass of the working fluid in the deaerator and the total energy in the deaerator according to the flow rate and heat content of all working fluids in the deaerator, where the working fluid includes steam extraction from a medium-pressure cylinder, high-pressure preheating Heater drain water and condensate water and boiler feed water;

[0035] The specific content of step S101 is as follows: In this modeling process, the influence of saturated gas on the total mass and total energy of the deaerator can be ignored. According to ...

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Abstract

The invention provides a nonlinear condensation water throttle control model. The model comprises the following steps that a model about the total mass of working fluid in a deaerator and the total energy in the deaerator is built according to the flowing speeds and heat content of all working fluid in the deaerator; when the total mass of the working fluid in the deaerator is equal to the total mass of saturated water, a mass equivalent model about the total mass of the working fluid in the deaerator and the total mass of the saturated water is built; when the total energy in the deaerator is equal to the total energy of the saturated water, an energy equivalent model about the total energy in the deaerator and the total energy of the saturated water is built; according to conversion of the mass equivalent model and the energy equivalent model, a nonlinear model about the water level and temperature in the deaerator is obtained; according to the states of a preheater and a high pressure cylinder in a condensation water throttle system, a nonlinear model of the unit load is built; and according to the nonlinear model, the nonlinear condensation water throttle control model is built. The nonlinear condensation water throttle control model is simple in structure and capable of achieving control conveniently.

Description

technical field [0001] The invention relates to the technical field of energy storage for thermal systems of generating sets, in particular to a nonlinear condensate throttling control model. Background technique [0002] The AC heat exchange system of a supercritical thermal power plant is equipped with three high-pressure cylinder preheaters, four low-pressure cylinder preheaters and one deaerator. During condensate throttling, the stored energy in the deaerator and low-pressure cylinder preheater is activated. All extraction steam flow is reduced from the deaerator to the final LP cylinder preheater. The feed water flow remains unchanged, the water level of the deaerator continues to decrease, and the stored energy of the deaerator is continuously activated. Therefore, the water level of the deaerator must be strictly monitored. If the water level in the deaerator exceeds the safety limit, the boiler feed pump will perform emergency actions. Boiler feed water flow wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D5/26
CPCF22D5/26
Inventor 刘东升许翀寰
Owner ZHEJIANG GONGSHANG UNIVERSITY
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