A method for optimizing scr ammonia injection
A prediction method and support vector machine technology, applied in chemical instruments and methods, separation methods, dispersion particle separation, etc., can solve problems that no one has raised, and achieve the effect of reducing out-of-stock costs
Active Publication Date: 2016-08-24
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0005] Most of the current ammonia injection control systems only consider how to improve the denitrification efficiency and reduce the ammonia slip rate. No one has proposed a method to directly control the amount of ammonia injection with the minimum denitrification cost as the constraint. Therefore, a method that is constrained by the minimum denitrification cost is needed The SCR ammonia injection strategy, through optimization, obtains the amount of ammonia required at the lowest denitrification cost, so as to obtain the best ammonia injection amount and reduce NO X emissions and improve plant economics
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[0115] Taking a power plant as an example, first predict the denitrification efficiency: select 20 sets of training samples for training, and obtain the denitrification efficiency and load, ammonia injection amount, flue gas oxygen content and NO X Generate a model of the relationship between quantities.
[0116] After the model is established, different working conditions are selected as examples to predict the denitrification efficiency. The results are as follows.
[0117] Total cost = ammonia injection amount × ammonia water price + 1.732 × equipment voltage × (k × ammonia injection amount + b) × power factor × internal electricity price + NO X Production amount × (1- denitrification efficiency) × charging standard - electricity price compensation
[0118] Table 1 Prediction results of denitrification efficiency under different working conditions
[0119]
[0120] Taking the amount of ammonia injection as the variable to be optimized, and other parameters as fixed val...
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The invention relates to a method for optimizing SCR ammonia injection, comprising the steps of: (1) predicting the SCR denitration efficiency of the unit according to a support vector machine; (2) predicting the denitrification efficiency and the measured NO X The total denitrification cost is calculated based on the production volume, boiler load, flue gas oxygen content, flue gas volume, and ammonia injection volume; (3) optimize the ammonia injection volume, and finally obtain the ammonia injection volume corresponding to the minimum total denitrification cost. The present invention first predicts the denitrification efficiency of the unit according to the support vector machine, and then according to the obtained denitrification efficiency and NO X Production amount, calculate the total cost of denitrification, and finally consider the denitrification efficiency and each denitrification cost, optimize the model, get the best ammonia injection amount, and then reduce the cost of out of stock.
Description
technical field [0001] The invention belongs to the technical field of selective catalytic reduction (SCR) for electric power generation in power plants, in particular to a method for optimizing SCR ammonia injection. Background technique [0002] The rapid growth of nitrogen oxide (NOx) emissions has exacerbated the worsening trend of regional acid rain. The research results show that the increase of nitrogen oxide emissions has caused my country's acid rain pollution to change from sulfuric acid to sulfuric acid and nitric acid. It can be predicted that flue gas denitrification in thermal power plants will become the focus of environmental protection work in thermal power plants in my country in the next step. [0003] Selective catalytic reduction (SCR) technology is currently the mainstream technology for flue gas denitrification in thermal power plants. X , mainly NO and NO 2 ) undergoes a chemical reaction to generate harmless nitrogen and water, thereby removing NO ...
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IPC IPC(8): B01D53/90B01D53/56
Inventor 张宇王桂林周义刚周连升薛泽海边疆王森
Owner STATE GRID CORP OF CHINA