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A steam temperature control method for double reheat unit considering heat storage of reheater

A technology of secondary reheating and steam temperature, which is applied in the control of superheat temperature, steam superheating, steam generation, etc., can solve the problems of large inertia on the boiler side and difficult control of steam temperature, and achieves simple implementation method, short recovery period, The effect of improving quality

Active Publication Date: 2022-03-22
XI AN JIAOTONG UNIV
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Problems solved by technology

[0003] The present invention aims at improving the control quality of steam temperature and improving the safety during operation, aiming at the problems of large boiler side inertia and difficult control of steam temperature in the double reheating unit, starting from the essential difference between the transient process and the steady state process

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  • A steam temperature control method for double reheat unit considering heat storage of reheater
  • A steam temperature control method for double reheat unit considering heat storage of reheater
  • A steam temperature control method for double reheat unit considering heat storage of reheater

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0061] The present invention is a steam temperature control method of a double reheat unit considering the heat storage of the reheater, such as figure 1 As shown, the specific implementation method is as follows: In the transient process, the difference between the real-time heat storage of the boiler and the set value of the boiler heat storage is processed by the PID controller and used as the coal amount compensation value, and the coal amount compensation amount and the coal amount command The new value of the coal quantity is obtained by summing; the heat brought by the coal quantity compensation value is compared with the difference between the real-time stored heat of the boiler and the set value of the boiler stored heat corresponding to this moment, and is recorded as the heat ratio k 1 ; The difference between the real-time stored heat of the...

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Abstract

The invention discloses a method for controlling the steam temperature of a secondary reheat unit considering the heat storage of the reheater. The large proportion of heat makes it difficult to control the steam temperature. In order to solve the above problems, the difference between the boiler's real-time heat storage and the set value of the boiler's heat storage is processed by the PID controller as the coal amount compensation value, and is added to the coal amount command to obtain a new coal amount value; The heat brought by the compensation value is the quotient of the difference between the real-time heat storage capacity of the boiler and the set value of the heat storage capacity of the boiler corresponding to this moment, and is recorded as k 1 ; Calculate the difference between the real-time heat storage capacity of the reheater and the set value of the heat storage capacity of the reheater and k 1 The multiplied product is used as the compensating value of the flue gas recirculation amount, and it is calculated with the change in the amount of heat absorption of the water wall caused by the change of the unit flue gas recirculation amount. new value. The present invention can obviously improve the steam temperature quality, and the investment is low.

Description

technical field [0001] The invention belongs to the technical field of thermal control in thermal power plants, and in particular relates to a method for controlling the steam temperature of a secondary reheat unit considering the heat storage of a reheater. Background technique [0002] The precise control of steam temperature in coal-fired units is of great significance to the economy and safety of its operation. The boiler side parameters of the double reheating unit are high, there are many equipments, and the process is complicated, so its thermal inertia is large, and the steam temperature is difficult to control accurately. In addition, because the double reheat unit has an additional stage of reheat compared with the single reheat unit, the number of reheaters in the double reheat unit increases, and the distribution of heat storage is more obvious, which intensifies the difficulty of controlling the steam temperature. Considering the time-varying characteristics an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22G5/02F22G5/06
CPCF22G5/02F22G5/06
Inventor 王珠严俊杰刘明
Owner XI AN JIAOTONG UNIV
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