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Automatic control method for saturated steam heating rate in startup temperature-rise period of thermal power generating unit

A thermal power unit and heating stage technology, applied in superheated temperature control, control system, steam superheating, etc., can solve unsatisfactory problems, achieve the effects of reducing labor intensity, shortening start-up time, and ensuring safety

Active Publication Date: 2013-12-18
STATE GRID HUNAN ELECTRIC POWER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the temperature rise rate of saturated steam depends on the preset burner input time interval, which cannot meet the control requirements of making the temperature rise rate of saturated steam as close to the upper limit as possible without exceeding the upper limit

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1), put into the burner. Use the conventional method to program the control logic of the thermal power unit to be controlled. When the thermal power unit to be controlled enters the start-up heating stage, according to the burner input sequence specified by the boiler manufacturer of the thermal power unit to be controlled, a burner is put into the boiler of the thermal power unit to be controlled;

[0018] (2), set the "wait 1min" program. Using conventional methods, in the control logic programming carried out in step (1), set the "wait for 1min" program;

[0019] (3) Judging whether the start-up and heating-up phase of the unit is completed. Utilize the control logic programming edited in step (1), use conventional method to judge whether the completion condition of described thermal power unit to be controlled start-up temperature-raising stage is satisfied, and judgment result shows that the completion condition of described thermal power unit to be controlled s...

Embodiment 2

[0021] Steps (1)~(2) are with embodiment 1;

[0022] (3) Judging whether the start-up and heating-up phase of the unit is completed. Utilize the control logic programming edited in step (1), use conventional methods to judge whether the completion condition of the start-up heating phase of the thermal power unit to be controlled is satisfied, and the judgment result shows that the completion condition of the start-up temperature rise phase of the thermal power unit to be controlled is not satisfied , go to step (4);

[0023] (4) Determine the heating rate of saturated steam. Continue to use the control logic programming edited in step (1), use conventional methods to calculate the temperature rise rate of the saturated steam in the heating stage of the thermal power unit to be controlled, and make the following judgments:

[0024] Let A be the upper limit of the temperature rise rate of saturated steam allowed in the start-up temperature rise phase of the thermal power unit ...

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Abstract

The invention discloses an automatic control method for the saturated steam heating rate in the startup temperature-rise period of a thermal power generating unit. The method comprises the following steps: (1) putting into a burner; (2) setting up a program about waiting for 1 min; (3) judging whether the unit startup temperature-rise period is finished or not; (4) judging the saturated steam heating rate. By virtue of the method, the thermal power generating unit can automatically control the saturated steam heating rate in the startup period to be close to the upper limit value but not exceed the upper limit value. The judgment can be performed by automatically monitoring change of the saturated steam heating rate in real time as follows: if the heating rate is slow, the burner is put into the unit in time to shorten the startup time; if the heating rate is too fast, the burner is taken out in time to ensure the safety of a boiler plant. Therefore, the labor intensity of operators can be reduced; the unit startup time can be shortened; the security and the economic efficiency in the startup temperature-rise period of the thermal power generating unit can be improved.

Description

technical field [0001] The invention belongs to the technical field of automatic control of thermal power units, and in particular relates to an automatic control method for the temperature rise rate of saturated steam during the heating up stage of thermal power units. Background technique [0002] After the boiler warm-up stage in the start-up process of the thermal power unit is over, it enters the heating-up stage. In this stage, there is a strict upper limit on the heating rate of the saturated steam. If the temperature rise rate of saturated steam is too high, it may cause the boiler heating surface to overheat and burst, which will directly affect the service life of the boiler; if the temperature rise rate of saturated steam is too low, it will prolong the start-up time of the unit and reduce its economy. Therefore, how to make the temperature rise rate of saturated steam close to the upper limit without exceeding the upper limit is the core technical problem to be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22B35/00F22G5/20
Inventor 张建玲朱晓星刘武林王伯春
Owner STATE GRID HUNAN ELECTRIC POWER
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