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A control method for improving the flexibility of coal-fired units through condensate throttling

A technology for condensate throttling and coal-fired units, applied in mechanical equipment, steam engine installations, machines/engines, etc., can solve problems such as parameter fluctuations, achieve short recovery periods, increase variable load rates, and implement simple methods.

Active Publication Date: 2022-08-05
XI AN JIAOTONG UNIV
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of large parameter fluctuations caused by the increase of variable load rate of coal-fired units, the present invention aims to find a highly flexible control strategy for coal-fired units based on the essential differences in the dynamic characteristics of steam turbines and boilers

Method used

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  • A control method for improving the flexibility of coal-fired units through condensate throttling
  • A control method for improving the flexibility of coal-fired units through condensate throttling
  • A control method for improving the flexibility of coal-fired units through condensate throttling

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] The present invention is a control method for improving the flexibility of a coal-fired unit by throttling condensate water, and a certain secondary reheat unit is selected as a research object. The specific implementation method is as follows:

[0036] 1. The maximum storage capacity available in the deaerator during variable load The amount and the time that the condensate throttling can last is calculated as follows:

[0037] After the unit is determined, the diameter of the deaerator head, the height of the deaerator head, the radius of the deaerator water storage tank, and the length of the deaerator water storage tank can be obtained according to the structural dimension diagram of the deaerator. According to the current operating state of the unit, the water level of the deaerator and the thermodynamic parameters of the working fluid in...

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Abstract

The invention discloses a control method for improving the flexibility of a coal-fired unit through condensate throttling. The power change in the variable load process is undertaken by two parts: a condensate throttling system and a unit coordinated control system; , The original variable load rate can get the time that the condensate throttling can last, and then the reset variable load rate of the unit coordinated control system can be obtained; the load command drawn by the original variable load rate and the unit coordinated control system reset the variable load rate The difference between the proposed load commands is the load command undertaken by the condensate throttling system; therefore, the unit coordinated control system operates at a reset variable load rate lower than the original variable load rate, and the parameter fluctuations are small. The invention reduces the fluctuation range of parameters through the coupling of condensate throttling and the unit coordinated control system, improves the variable load rate, and improves the flexibility of the unit.

Description

technical field [0001] The invention belongs to the technical field of thermal control of thermal power plants, and in particular relates to a control method for improving the flexibility of a coal-fired unit by throttling condensate water. Background technique [0002] The integration of a large amount of intermittent renewable energy into the grid will cause severe fluctuations in the grid. In order to improve the security of the power grid and reduce the phenomenon of abandoning wind and light, it is necessary to improve the flexibility of coal-fired units. However, when the coal-fired unit is running, the variable load rate is too high, which will cause parameter fluctuation and seriously affect the safety of the unit. Therefore, while increasing the variable load rate, the parameter fluctuation must be reduced. The parameter fluctuation is caused by the inertia difference between the boiler and the steam turbine. The large thermal inertia of the boiler causes the para...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01K13/02F01K9/00F01K21/00
CPCF01K13/02F01K9/00F01K21/00
Inventor 严俊杰王珠刘明严卉
Owner XI AN JIAOTONG UNIV
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