A CFB boiler flue gas denitrification automatic control method and system
A technology for boiler flue gas and denitration, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of denitration control lag and denitrification agent consumption, etc., so as to reduce the original generation concentration of NOx and reduce the amount of denitrification agent. Consumption, the effect of solving the fluctuation of the peak-shaving denitrification control system of the unit
Active Publication Date: 2021-09-21
HUANENG CLEAN ENERGY RES INST
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[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a CFB boiler flue gas denitrification automatic control method and system. question
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[0023] The present invention is described in further detail below in conjunction with accompanying drawing:
[0024] The CFB boiler flue gas denitrification automatic control method of the present invention comprises the following steps:
[0025] Measure the NOx concentration n(x) of the boiler flue gas in real time, and then compare the NOx concentration n(x) of the boiler flue gas with the theoretical value of the NOx concentration of the preset boiler flue gas n 0 (x) carry out normalization processing, obtain the normalization processing result of the NOx concentration of boiler flue gas;
[0026] When the normalized processing result of the NOx concentration of the boiler flue gas is in the interval [0, 0.75], calculate the consumption of the denitrification agent, where the consumption of the denitrification agent=k*(n(x)-n 0 (x))*m NH3 / m NOx *B1+B2, k is the flow coefficient, B1 is the flue gas flow rate of the boiler, B2 is the feed-forward data of denitrification ...
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The invention discloses a CFB boiler flue gas denitrification automatic control method and system, comprising the following steps: measuring the NOx concentration n(x) of the boiler flue gas in real time, and then comparing the NOx concentration n(x) of the boiler flue gas with the preset boiler Theoretical value of NOx concentration in flue gas n 0 (x) Perform normalization processing to obtain the normalization processing result of the NOx concentration of the boiler flue gas; when the normalization processing result of the NOx concentration of the boiler flue gas is in the interval [0, 0.75], then according to the calculation, The consumption of the denitrification agent controls the opening of the denitrification agent regulating valve; when the normalized processing result of the NOx concentration of the boiler flue gas is in the interval [0.75, 1], the secondary fan is adjusted according to the demand for the secondary air At the same time, the frequency of the primary fan is adjusted according to the demand of the primary air to realize the automatic control of the flue gas denitrification of the CFB boiler. This method and system can effectively solve the problems of lagging denitrification control and large consumption of denitrification agents in the prior art.
Description
technical field [0001] The invention belongs to the field of boiler smoke exhaust pollutant control and environmental protection, and relates to an automatic control method and system for CFB boiler smoke denitrification. Background technique [0002] Nitrogen oxides (NOx) produced by coal combustion in boilers are one of the main air pollutants, causing serious environmental problems. Selective non-catalytic reduction (SNCR) is a method of controlling nitrogen oxide emissions. This method does not use a catalyst and reduces NOx in the range of 850-1100 ° C. The reducing agent is usually ammonia or urea. The process is simple and it is especially suitable for recycling Fluidized bed (CFB) boiler denitrification. [0003] The unique structure of the CFB boiler helps the injected reducing agent and flue gas mix evenly, and the injection point is set in the horizontal flue before the separator, which can significantly reduce the ammonia-nitrogen ratio and reduce the amount of ...
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IPC IPC(8): B01D53/76B01D53/56
Inventor 李昱喆韩应高洪培时正海刘冬
Owner HUANENG CLEAN ENERGY RES INST