Method and device for integrally desulfurizing, denitrating and dust-removing by plasma

Abstract

The invention discloses an integrated treatment method capable of desulfurizing, denitrating and dust-removing at the same time, and provides a device which adopts the treatment method. Smoke formed after the combustion in a boiler contains the main ingredients of SO2, NOX and dust, and passes through a plasma generation electrode; generated plasmas contain a large amount of high-energy electronics and act on O2 and H2O to generate a large quantity of active particles, such as H, O, OH and O3. The SO2 and the NOX can perform chemical reaction to generate high-valence state sulfur oxides and nitrogen oxides under the effect of the active particles, and then the sulfur oxides and the nitrogen oxides are combined with introduced ammonia gas to generate ammonium salts; the ammonium salts are recovered and serve as secondary products; and therefore, the desulfurizing and the denitrating are realized. In the process, charged particles in the plasmas can electrify dust particles, so that the charged particles can move directionally under the effect of an additional direct-current bias electric field; and therefore, the function of removing the dust is realized. According to the method and the device, the static electricity dust removal and the plasma desulfurizing and denitrating are integrated, so that the number of power supplies is reduced, the efficiency of a discharge power supply is improved, the energy consumption can be reduced, the investment is saved, the occupied area is reduced, and the cost is reduced.

Description

technical field [0001] The invention belongs to the fields of flue gas treatment technology and air purification in thermal power plants, and specifically relates to an integrated treatment method for plasma desulfurization, denitrification and dust removal, and a device using the integrated treatment method. Background technique [0002] SO from coal burning 2 , NO X It is the main substance of acid rain and photochemical smog, which brings serious harm to the ecological environment and the health of residents. During the "Eleventh Five-Year Plan" period, the country implemented SO 2 emission reduction strategy, and will implement more stringent SO 2 and NO X emission control standards. However, the flue gas desulfurization, denitrification and dust removal technology at this stage is only for SO 2 , NO X , dust particles and other pollutants are treated separately, there are many deficiencies, and the integrated treatment method has not yet been realized. [0003] ...

AI Technical Summary

Problems solved by technology

[0005] To sum up, there are some problems in the current flue gas desulfurization, denitrification and dust removal technology: 1. There are common problems such as severe corrosion, high operation and maintenance costs and easy to cause secondary pollution; 2. The catalyst is very expensive and the cost is high; 3. Single desulfurization or single denitrification, the two cannot be carried out at the same time; 4. The process is complicated, the floor area is large, and the operating cost is high; 5. The efficiency of single treatment is high, and the efficiency of joint treatment is low; 6. The existing plasma technology requires Excessive power consumption

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