A Control Method for Preventing Excessive Adjustment of Boiler Coal Feeding During Load Variation

A control method and variable load technology, applied in the direction of adjusting fuel supply, combustion method, and combustion control, etc., can solve the problems of insufficient boiler coal quantity, unseen boiler load control system scheme, affecting unit stability, etc.

CN102607055BInactive Publication Date: 2014-10-29SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-10-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a control method for preventing excessive adjustment of coal feed for a boiler in the process of varying load, which is characterized in that a set value of main stem pressure obtained via a sliding pressure function is subjected to inertial filtering by four variable parameter inertial procedures, the change of the set value of the main steam pressure within a varying load starting period of a unit is delayed, the deviation between the set value of the main steam pressure and actual steam pressure within the starting period is reduced, and accordingly the excessive adjustment of coal feed for the boiler in the process of varying load is lessened, and influence of main steam pressure fluctuation on stability of the whole unit is prevented. By the control method, operational stability of the unit can be improved effectively.
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Description

technical field

[0001] The invention relates to a control method for preventing excessive adjustment of boiler coal supply during load changing, in particular to a control method that adopts four inertial links to perform inertial filtering on the set value of main steam pressure and automatically changes the integral time of the boiler load regulator. , effectively reduce the deviation between the fixed value of the main steam pressure and the actual steam pressure in the initial period of unit variable load, and reduce the integral adjustment effect on the steam pressure deviation during this period, so as to prevent excessive coal feed to the boiler during the load variable process The advanced control method of regulation belongs to the field of thermal power engineering and automatic control. Background technique

[0002] Boiler load control (also known as the calculation circuit of boiler coal quantity command) determines the amount of coal that should be added to the ...

Examples

Embodiment Construction

[0036] The present invention will be described below with reference to the accompanying drawings.

[0037] A control method invented to prevent excessive adjustment of boiler coal supply in the process of variable load is realized through the following technical solutions:

[0038] The set value of the main steam pressure of the unit is:

[0039] P 0 =LAG(LAG(LAG(LAG(F 1 (N 0 )))))+BP

[0040] In the formula, N 0 is the load command of the thermal power unit; P 0 It is the set value of the main steam pressure of the unit; BP is the manual adjustment offset of the set value of the main steam pressure; F 1 (g) is a preset sliding pressure function, which can be set according to the load command N of the unit 0 to calculate the set value of the main steam pressure; LAG is an inertia link with variable parameters, and its transfer function expression is:

[0041] LAG ( s ) = 1 ...