| The fuel gas emission has been the main domestic air pollution nowadays.Due to the old technologies,low innovation awareness and environmental protection awareness of technological staff,lots of companies have faced with the problems such as instability of equipment or the low efficiency of purification.Especially in undertaking the latest emission standard,it has become a serious problem in enhancing the previous equipment.It is aimed to take Jingliang Longjiang Captive Power Plant as examples to analyze the traditional SNCR,Electric-bag Composite Dust Remmoval Technology and Limestone Gypsum Wet Flue Gas.The power station uses the traditional SNCR denitration process,the electric bag composite dust removal process and the limestone-gypsum wet desulfurization process for flue gas treatment.It is aimed to analyze the relation between different process in controlling index with the efficiency in dealing with the gas denitration of NOx and SO2.Putting forward the main problem of power station is the low efficiency in desulfurization.In changing the temperature and the input of limestone to adjust could help to analyze the influential patterns of the index,Ca/S,flow capacity of gas,pH and denitration of SO2 which could lead to the best operation plan in dealing with the gas according to the best operation index.CFB makes full use of the LNB,controls the ppm of the output gas NOx,PM and SO2 into about 126.5 mg/m3,10040.04 mg/m3 and 438.75 mg/m3.With the purify,it has changed into about 44.1 mg/m3,9.5 mg/m3 and 31.59 mg/m3.In SNCR,the consumption of Ammonia which ppm is 10%is 7.5 t/a.The process temperature is from 820 to 1154?and the best operation temperature is from 937 to983?.The Ammonia-nitrogen ratio is 1.06 and the rate of denitration could be from64%to 66.2%.The temperature of the Electric-bag Composite Dust Removal Process has been controlled from 124 to 169?and its best operation temperature should be from 150 to 160?and its dedusting rate could be 99.93%.In the FDG,the temperature of gas would be from 151 to 164?.The limestone,as the absorbing rate,has a 90%degree in purity and its daily usage would be 9.6 t/d.The flow rate in absorbing the gas in tower would be 4.58 m/s and the pH rate would be from 5.1 to 6.1.The liquid to gas ratio would be 9.42 and the calcium sulfur ratio would be from 1.01 to1.55.The rate of desulfurization could be from 92.54%to 93.04%.In analyzing the low efficiency in purifying SO2 is that the coal changes in the process of burning and that the boiler lead to the change ranges in SO2.In addition,the controlling of the calcium carbonate is not reasonable enough which leads to the low rate of the purifying the pollution of the system.It's able to change the calcium sulfur ratio,pH of slurry and the gas temperature,observe the output concentration and summarize its influential effects to SNCR.In the process,it could be found out that when the input of the limestone has been 8.9t/d,the input temperature has been from 118 to 125?,the average calcium sulfur ratio has been 93.31%and the output concentration could be 29.35 mg/m3.In the operation,what could be suggested is that increasing the quantity of limestone is 8.9 t/d.It should be disposed the absorbent as 1:10 to absorb the solution.At the same time,it could be added the GGH to decrease the temperature of input gas.Under this circumstance,the company could save?52,433.9 in absorbent and the pollution discharge. |
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