A low-nitrogen combustion damper control method in the process of boiler load reduction
A boiler load and air door control technology, which is applied in the direction of combustion method, combustion control, air supply adjustment, etc., can solve the problem of boiler outlet oxygen change without consideration of boiler balance, boiler outlet nitrogen oxides fluctuate greatly, and air volume adjustment without consideration and other problems, to achieve the effect of shortening the debugging time and accuracy, good low-nitrogen combustion level, and convenient debugging
Inactive Publication Date: 2017-07-04
冉启发 +1
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[0004] This control method does not consider the hysteresis of the air door switch and the dead zone of the actuator to affect the air volume adjustment, nor does it consider the balance between boiler combustion and oxygen, that is, the change of oxygen volume at the boiler outlet. If the boiler load changes frequently, the air volume cannot keep up with the change of fuel. , at this time, because the boiler burner area will have too much oxygen in the flue gas due to the excess air system, the oxygen-deficient combustion air volume will not be formed
Therefore, this control method will cause large fluctuations in boiler outlet nitrogen oxides when the boiler load changes
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[0023] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with preferred embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.
[0024] A method for controlling a low-nitrogen combustion damper during boiler load reduction, comprising the following steps:
[0025] The automatic generation control (AGC) of the unit in the DCS system sends a boiler load command to the DCS system. When the coordinated control system (CCS) in the DCS system judges that the load is reduced, according to the preset boiler load and damper opening command Functional relationship F(x)=20+(L Furnace-143)×(45-20)÷(192-143) In the formula, L furnace is the boiler load command, ...
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The invention discloses a method of controlling a low-nitrogen combustion damper in the load-down process of a boiler. An AGC (automatic generation control) system and a CCS (coordinated control system) of a unit in a DCS (distributed control system) can send out a boiler load command; if the DCS determines load-down, a damper openness command is acquired according to a preset boiler load and damper function F(x); an oxygen sensor at an outlet of a boiler transmits an oxygen measured value to the DCS; the DCS calculates a difference between the oxygen measured value and a preset oxygen value according to the preset oxygen value; damper offset is acquired through a dead zone adjustment polygonal function F(o) according to a boiler oxygen offset preset in the DCS; a value of the function F(o) is sent to a PI (proportion integration) regulator, is multiplied by a quotient obtained by dividing an output range of the function F(x) by 2, and is then added to a value of the F(x) so as to obtain the damper openness command; the DCS sends the optimized damper openness command to a damper actuator. Therefore, low-nitrogen combustion control of the boiler is effectively achieved, and environmental running of the boiler is realized.
Description
technical field [0001] The invention relates to the field of boiler combustion control. More specifically, it relates to a method for controlling a low-nitrogen combustion damper during boiler load reduction. Background technique [0002] Due to the requirements of environmental protection, in recent years, the low-nitrogen combustion transformation of the original electric boilers and the new boilers have put forward the requirements for the emission of nitrogen oxides to meet the standard. Generally, denitrification devices are installed at the boiler flue gas outlet. In order to reduce the capacity and operating cost of the denitrification device, it is the most economical way to design and modify the boiler with low-nitrogen combustion to reduce the amount of nitrogen oxides produced by the boiler from the source. The way of boiler low-nitrogen combustion is to complete the combustion process of fuel in stages. In the first stage of combustion, only 70%-75% of the tota...
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IPC IPC(8): F23N3/00
Inventor 冉启发谢京涛吴斌刘伟崔振武王鸣杨海滨
Owner 冉启发