An intelligent control method for main steam pressure of supercritical or ultra-supercritical unit boiler

A technology of ultra-supercritical unit and main steam pressure, applied in the direction of adaptive control, general control system, control/regulation system, etc., can solve problems such as disturbance and poor anti-disturbance ability, and achieve improved stability, robustness, and safety Sexual and economical effects

Active Publication Date: 2018-05-22
CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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AI Technical Summary

Problems solved by technology

Due to the large hysteresis and nonlinear characteristics of ultra (super) critical units, this conventional control strategy has poor anti-disturbance ability in the normal adjustment process, and may cause unnecessary disturbances due to the mismatch of various parameters of the unit

Method used

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  • An intelligent control method for main steam pressure of supercritical or ultra-supercritical unit boiler
  • An intelligent control method for main steam pressure of supercritical or ultra-supercritical unit boiler

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Embodiment Construction

[0016] In the intelligent control method of the main steam pressure of supercritical or ultra-supercritical unit boilers, the main controller of the boiler will automatically adjust the initial Impulse", "Brake Impulse" and "Dynamic Compensation Coal Feed" magnitude and direction, as well as the main steam pressure setting value and its PID adjustment, where the main steam pressure setting value is based on the preset sliding pressure curve Obtained, the sliding pressure curve is determined by the operation mode and thermal characteristics of the steam turbine in the super (super) critical thermal power unit. Different units have different sliding tooth curves, which refers to the relationship between the load and the pressure setting value during the operation of the unit (how much load corresponds to how much pressure).

[0017] As shown in the table below:

[0018] x (Load %): 0 40 45.45 60.6 69.69 78.78 100 110

[0019] y (design pressure MPa): 4.2 10.4 11.2 13.4 14.8 16...

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Abstract

The invention discloses an intelligent control method for a main steam pressure of a supercritical (ultra-supercritical) unit boiler. The method comprises adjustment of variables required by a boiler master controller and adjustment of a main steam pressure set value, wherein during the adjustment of the variables required by the boiler master controller, the main steam pressure set value and a feed-forward quantity are controlled and adjusted according to an actual main steam pressure variation rate; and during the adjustment of the main steam pressure set value, a pressure adjustment sliding pressure curve of the main steam pressure is acquired at first, a positive constraint value and a negative constraint value are determined for the adjustment sliding pressure curve of the main steam pressure so as to form a pressure set value constraint face used for the adjustment, control rules of the pressure set value inside and outside the constraint face are then established, and whether the boiler master controller adjusts the main steam pressure is determined according to the control rules. In a conventional main steam pressure control system, the method disclosed by the invention has the advantages that random errors existing in actual adjustment courses are overcome; the main steam pressure under rapid AGC load variation is adjusted stably; a load response rate of a supercritical unit is increased effectively; and safety and economic efficiency of unit running are improved.

Description

technical field [0001] The invention belongs to the technical field of industrial process control, and in particular relates to an intelligent control method for the main steam pressure of a supercritical or ultra-supercritical unit boiler, which is a generalized intelligent control of the main steam pressure of an ultra (super) critical unit operating on the basis of a sliding pressure constraint surface method. Background technique [0002] At present, the ultra (ultra) critical unit adopts the variable pressure once-through boiler. The once-through boiler-steam turbine is a complex and multi-variable controlled object. The main steam pressure is an important output of the system and one of the most important parameters of the thermal system. The main feature of super (super) critical unit is that it has strong nonlinearity. In the case of satisfying the rapid load change, the main steam pressure is prone to large fluctuations. The fluctuation of pressure will cause a seri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
CPCG05B13/041
Inventor 张剑庄义飞陈胜利张兴陈涛
Owner CHINA DATANG CORP SCI & TECH RES INST CO LTD EAST CHINA BRANCH
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