Method for SCR ammonia injection adjustment optimization based on full-load accurate denitration requirements
A full-load, denitrification technology, applied in control/regulation systems, instruments, adaptive control, etc., can solve the problem of ultra-low emission of unsuitable units, deep peak regulation of full-load denitrification, large deviation between NOx and net flue gas NOx, Ammonia injection adjustment system adjusts lag and other problems to achieve the effect of improving the accuracy of ammonia injection, avoiding control disorder, and accurately controlling
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[0043] Example 1, such as Figure 1-Figure 5 As shown, a method for adjusting and optimizing SCR ammonia injection based on full-load precise denitrification requirements includes the following process steps:
[0044] The first step is to use the change rate of the boiler flue gas volume, NOx at the inlet of denitrification SCR, and NOx at the outlet of denitrification SCR as the feedforward signal to obtain the basic value of the ammonia injection flow rate to adapt to the adjustment requirements of variable working conditions; among them, the boiler flue gas The quantity is the boiler fuel quantity and total air quantity;
[0045] The second step is to use the ammonia injection flow rate as the adjustment amount to eliminate the anti-interference problem caused by the ammonia injection adjustment door opening as the adjustment amount;
[0046] The third step is to establish the main adjustment loop based on the hourly average value of the net flue gas NOx of the chimney to meet th...
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