Method for optimizing SCR (Selective Catalytic Reduction) ammonia spraying
A prediction method and support vector machine technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as no one raised, and achieve the effect of reducing out-of-stock costs
Active Publication Date: 2014-12-10
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 (Selective Catalytic Reduction) ammonia spraying. The method comprises the following steps: (1) predicting the SCR denitration efficiency of a machine unit according to a support vector machine; (2) calculating the total denitration cost according to the predicted denitration efficiency and the measured NOx production amount, boiler load, flue gas oxygen content, flue gas quantity and ammonia spraying amount; and (3) optimizing the ammonia spraying amount, thereby obtaining the ammonia spraying amount corresponding to the minimum total denitration cost. According to the method, the denitration efficiency of the machine unit is firstly predicted according to the support vector machine, then the total denitration cost is calculated according to the obtained denitration efficiency and the NOx generation amount, and finally, a model is optimized based on overall consideration of the denitration efficiency and the total denitration cost, the optimal ammonia spraying amount is acquired, and thus, the denitration cost is reduced.
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