Method for simultaneously removing PM2.5 granules, SO2 and NOx from flue gas and recycling by-product

Abstract

The invention discloses a method for simultaneously removing PM2.5 particles, SO2 and NOx of smoke gas and reclaiming byproducts. The smoke gas to be treated is introduced to a pulse corona electric field and absorption liquid is sprayed to purify the smoke gas at the same time; the pulse corona electric field is produced by an acicular corona wire connected with negative pulse high voltage and a netty metal electrode connected with positive pulse voltage; the absorption liquid is sprayed on the netty metal electrode to form liquid film; after the PM2.5 particles are charged, the PM2.5 particles move to the liquid film by electrostatic force and are adsorbed and caught by the liquid film; vapor and oxygen of the smoke gas are decomposed into O, OH, O3, HO2 and other oxidative free radicals; SO2 and NO of the smoke gas are oxidized into high valent state substances which are easy to absorb; subsequently, the substances are absorbed by the absorption liquid; and the reacted absorption liquid is crystallized through sensible heat drying of the smoke gas to be treated to generate reclaimable byproducts. The method realizes simultaneous removing of the PM2.5 particles, SO2 and NOx of the smoke gas and recycles the removed byproducts.

Description

technical field [0001] The invention relates to a flue gas treatment method, in particular to a method for simultaneously removing PM2.5 particles and SO 2 And NOx and the method of recycling the by-products. Background technique [0002] The basic characteristics of my country's energy resources are rich in coal, poor in oil, and low in gas. The total amount of coal resources far exceeds oil and natural gas resources. my country's coal accounts for more than 70% of the country's primary energy production and consumption for a long time. In 2007, my country's total energy consumption reached 2.65 billion tons of standard coal, of which coal consumption was 1.8 billion tons of standard coal, crude oil consumption was 340 million tons, and natural gas consumption was 67.3 billion cubic meters. my country is in the stage of heavy chemical industry and the status quo of the world's factories, and the possibility of major adjustments in the industrial structure in the next few ...

AI Technical Summary

Problems solved by technology

Regarding the power supply mode, the use of DC power supply causes the weight difference between the peak voltage Vp and the average voltage Va to reach 30-50%, and the Vp.Va directly related to the dust removal efficiency is too small, so that the PM2.5 particles are not fully charged

Regarding the rapping of the plate, there are two problems in the use of rapping to remove dust: one is that the rapping cannot remove the sticky dust, and the plate is severely corroded; the other is that the dust backmixing is serious (up to 50%) during the rapping time , leading to the failure of the electrostatic precipitator, and the dust removal efficiency of PM2.5 particles is greatly reduced

As more and more pollutants need to be controlled in the flue gas, the pollutant discharge standards are becoming more and more stringent. If we still adopt the "1+1" method and use different methods to remove different pollutants one by one, This will inevitably lead to huge investment and operation costs and complex purification systems, and the integration of various processes will also encounter many difficulties

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