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

Abstract

The invention discloses a boiler automatic combustion adjustment control method based on coal-air ratio coal quality correction, and solves the problems of long time, complex structure and high cost in the coal quality analysis aspect and still need of manual intervention in the boiler combustion adjustment in the control technology aspect. Through an angle combustion type boiler standard coal combustion test, ratios of air volumes to coal quantities under the condition of different generating capacities corresponding to different oxygen amounts are obtained; through logical configuration of a distributed control system, the timing detection and the result output of a coal quality correction coefficient K are realized; a general expression of an each-layer feedforward of a boiler auxiliary air door to the value K is calculated by the coal quality correction coefficient K; and the general expression of the each-layer feedforward to the value K calculated in the step 3 is added in a traditional control loop to realize the adjustment of a whole combustion state of secondary air and auxiliary air. The method is applied to the field of coal quality analysis and adjustment.

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...

Examples

specific Embodiment approach 1

[0031] 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:

[0032] (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;

[0033] (2) Through the logical configuration of the distributed control system, the timing detection and result output coal quality correction coefficient K are realized;

[0034] (3) Calculating the expression of feed-forward for each layer of boiler auxiliary air damper for the K value from the coal quality correction coefficient K;

[0035] (4) After adding the general expression of each layer’s feedforward K value calculated in Step 3 into the original control loop, t...

specific Embodiment approach 2

[0036] 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:

[0037] 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 ;

[0038] 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. ;

[0039] (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

[0045] 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 auxiliary air damper by the coal quality correction coefficient K;

[0046] 1. Set the number of auxiliary damper layers 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;

[0047] 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 of layer 3 is Arithmetic series obtai...

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...

Examples

specific Embodiment approach 1

[0031] 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:

[0032] (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;

[0033] (2) Through the logical configuration of the distributed control system, the timing detection and result output coal quality correction coefficient K are realized;

[0034] (3) Calculating the expression of feed-forward for each layer of boiler auxiliary air damper for the K value from the coal quality correction coefficient K;

[0035] (4) After adding the general expression of each layer’s feedforward K value calculated in Step 3 into the original control loop, t...

specific Embodiment approach 2

[0036] 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:

[0037] 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 ;

[0038] 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. ;

[0039] (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

[0045] 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 auxiliary air damper by the coal quality correction coefficient K;

[0046] 1. Set the number of auxiliary damper layers 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;

[0047] 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 of layer 3 is Arithmetic series obtai...

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