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All-process control method for main steam temperature of utility boiler

A technology of main steam temperature and power station boiler, which is applied in the fields of coal-fired generator set, main steam temperature control of power station boiler, and whole process control of main steam temperature of power station boiler, which can solve the problems of instability and poor performance of main steam temperature control.

Inactive Publication Date: 2015-02-25
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a high-accuracy, fast-response, simple and easy-to-operate method for controlling the main steam temperature of a power plant boiler based on a traditional cascade control scheme, so as to avoid problems with large delay, large inertia and time-varying characteristics. The main steam temperature object changes with the load of the unit, which leads to poor or even unstable control performance of the main steam temperature, so as to improve the control quality of the main steam temperature of the boiler

Method used

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  • All-process control method for main steam temperature of utility boiler

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Effect test

Embodiment 1

[0055] Specific steps are as follows:

[0056] Step 1. Divide the typical working conditions of power plant boiler operation:

[0057] According to the maximum load design capacity of the unit and the main operating load range, four typical operating point points are divided, and the four typical operating point points are respectively the minimum stable combustion load operating point X of the boiler. 1 =40%Norm (Norm: unit rated load, such as 600MW unit, Norm=600), rated maximum load operating point X 4 =100%Norm and 2 typical operating point X divided equally between the above two operating point 2 =60%Norm and X 3 =80%Norm;

[0058] Step 2. Test the mathematical model of the main steam temperature at the typical operating point:

[0059] Through active load lifting or waiting for load peak-shaving operation of the unit, the system characteristic model at the typical operating point is tested by the disturbance test, such as (1)~(2);

[0060] The first-order inertia pl...

Embodiment 2

[0092] In addition to dividing the 6 typical working condition points based on the maximum load design capacity of the unit and the main operating load range X 1 =40%Norm,X 2 =52%Norm,X 3 =64%Norm,X 4 =76%Norm,X 5 =88%Norm,X 6 =100%Norm, and the values ​​of the adjustable filter time constants of the outer loop and the inner loop are respectively T f1 =0.4 , T f2 =0.5 Except, remaining steps are identical with embodiment 1.

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Abstract

The invention discloses an all-process control method for the main steam temperature of a utility boiler. The all-process control method comprises the following steps: firstly, partitioning the typical working condition points of the operation of the utility boiler; secondly, testing the main steam temperature mathematical models at the typical working condition points; thirdly, caculating the optimal values of PID (Proportion Integration Differentiation) adjustable parameters at the typical working condition points; fourthly, utilizing a piecewise linear function module in a DCS (Decentralized Control System) to achieve control logical configuration; fifthly, realizing the approximate optimal control of the main steam temperature at any working condition points in the DCS. The all-process control method for the main steam temperature of the utility boiler has the benefits that automatic dispatching of the optimal values of PID adjustable parameters of the inner loop and the outer loop is guaranteed when the main steam temperature system of a thermal power generating unit is within the full-load range of the unit operation, the main steam temperature adjustment quality is greatly improved, and the over-temperature probability of the unit under the condition of great load changes is lowered.

Description

technical field [0001] The invention relates to a method for controlling the main steam temperature of a power station boiler, in particular to a method for controlling the main steam temperature of a power station boiler throughout the whole process, which is suitable for coal-fired generating sets and belongs to the technical field of automatic control. Background technique [0002] Main steam temperature control of large utility boilers is an indispensable link to improve economic benefits and ensure safe operation of units. The control requirements for the main steam temperature of the boiler are very strict. If the steam temperature is too high or too low, as well as large fluctuations, it will affect the safety and economy of the boiler and steam turbine. Therefore, it is very necessary to maintain the stable operation of the main steam temperature of the boiler. The superheater is generally composed of several stages, and the tubes of each stage are often made of dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F22B35/00
Inventor 王东风刘千江溢洋牛成林
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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