Boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction

A control method and automatic combustion technology, applied in the direction of combustion method, combustion control, air supply adjustment, etc., can solve the problems of complex structure, high cost, and long time consumption

Inactive Publication Date: 2017-10-03
哈尔滨汇通电力工程有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0016] The present invention aims to solve the problem of coal quality analysis in the existing method, which is time-consuming, complicated in structure, and high in cost; in terms of control technology, the combustion adjustment of the boiler still needs manual intervention, and provides a boiler automatic coal quality correction based on air-to-coal ratio. Combustion adjustment control method

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  • Boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction
  • Boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction
  • Boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction

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specific Embodiment approach 1

[0030] Specific implementation mode one: the boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction of the present embodiment, it is realized according to the following steps:

[0031] (1) Through the standard coal combustion test of the angle-fired boiler, the ratio of the air volume to the coal volume under different power generation corresponding to different oxygen amounts, referred to as the air-to-coal ratio, is used as the benchmark air-to-coal ratio;

[0032] (2) Through the logical configuration of the distributed control system, the timing detection and result output coal quality correction coefficient K are realized;

[0033] (3) Calculate the feedforward expression of each layer of the auxiliary air door of the boiler secondary air for the K value from the coal quality correction coefficient K;

[0034] (4) After adding the general expression of each layer’s feedforward K value calculated in Step 3 into the original...

specific Embodiment approach 2

[0035] Specific embodiment two: the difference between this embodiment and specific embodiment one is that step (2) realizes timing detection and result output coal quality correction coefficient K through the logical configuration of the distributed control system, and the specific steps are as follows:

[0036] ① Real-time sampling of air volume and coal volume by power plant sensors, real-time calculation of the current air-to-coal ratio, and dividing by the benchmark air-to-coal ratio in (1) to obtain a process variable, defined as K 1 ;

[0037] ②Define the boiler stable combustion state judgment parameter as S. In the logic configuration, the total air volume, total coal volume and oxygen volume of the boiler are differentiated through the inherent sensor to obtain the air volume change rate, coal volume change rate, and oxygen volume change rate. ;

[0038] (a) When the three conditions of air volume change rate less than 45t / h, coal volume change rate less than 5t / h a...

specific Embodiment approach 3

[0044] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that: step (3) calculates the general expression of feed-forward for each layer of boiler secondary air auxiliary air damper by the coal quality correction coefficient K;

[0045] 1. Set the number of layers of the secondary air auxiliary air damper of the original control circuit boiler corner burner as N layers, the bottom layer as the first layer, the top layer as the Nth layer, and the adjustment range is the maximum difference M% between the top layer and the bottom layer; among them, The N is any positive integer;

[0046] 2. When the coal quality correction coefficient is K=m 1 When , the feed-forward of the top layer, that is, the Nth layer is The feed-forward of the bottom layer, the first layer, is set to Each layer in the middle is an arithmetic sequence from small to large, then the feedforward opening of the second layer is The feed-forward opening ...

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Abstract

A boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction, the invention relates to a boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction. The present invention aims to solve the problems of long time-consuming, complicated structure and high cost in coal quality analysis in the existing method; in the control technology, the combustion adjustment of the boiler still needs manual intervention. Through the standard coal combustion test of the angle-fired boiler, the ratio of air volume and coal volume under different power generation corresponding to different oxygen volumes is obtained; through the logic configuration of the distributed control system, the timing detection and result output coal quality correction coefficient K is realized; The quality correction coefficient K calculates the general expression of the feedforward of each layer of the boiler auxiliary air damper for the K value; after adding the general expression of the feedforward of each layer calculated in step 3 for the K value to the original control loop, the secondary air auxiliary The overall combustion state of the wind is adjusted. The invention is applied in the field of coal quality analysis and control.

Description

technical field [0001] The invention relates to a boiler automatic combustion adjustment control method based on air-to-coal ratio coal quality correction. Background technique [0002] With the increase in demand for non-renewable energy and the further consumption of available energy, the state has formulated a policy of "energy saving and emission reduction". For thermal power units, the two issues of "coal saving" and "environmental protection" can actually be attributed to It is a problem, that is, how to improve the operation of the unit and prolong the service life of the unit without changing the original equipment of the unit. At present, the power grid generally implements AGC economic scheduling to save energy, but AGC scheduling only solves this problem from the perspective of "distribution", and the key to this problem is still in each individual power plant in operation. The existing AGC regulation , mainly on the basis of coordination, and in the coordination...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23N3/00
Inventor 柳行陶永沛马述军高庆辉姚著赵文江臧凯龙文明吴迪史传明李智博陈祥昊陈天宇
Owner 哈尔滨汇通电力工程有限公司
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