Flue gas purification method combining photocatalytic oxidation with double-cycle absorption
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A technology of catalytic oxidation desulfurization and photocatalytic reactor, which is applied in the field of microwave-coupled ultraviolet photocatalytic oxidation desulfurization and denitrification, can solve the problems of high energy consumption, large floor area, large energy consumption, etc., and achieve reduced floor space and easy operation , the effect of broad application prospects
Active Publication Date: 2019-10-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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However, these technologies still have some disadvantages in application, such as high cost, high energy consumption for free radical excitation, and by-products such as toxic gases may be produced during the process.
[0004] According to the research of other researchers, the oxidation method has been proved to be one of the effective ways to remove NO, the key is to oxidize NO into water-soluble NO 2 , the oxidants that can be used include hydrogen peroxide, sodium persulfate, sodium chlorite and some free radicals, and ozone is also a very
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Embodiment 1
[0080] Liquid-phase composite oxidant: the concentration ratio of sodium chlorite and sodium persulfate is 0.1:10% wt, and the pH is 4.5.
[0081] Absorbent: sodium sulfite concentration of 5% wt, pH of 9.
[0082] The reaction conditions of the microwave-coupled ultraviolet photocatalytic oxidative desulfurization and denitrification system are shown in Table 2.
[0083] Table 2 Reaction conditions
[0084]
[0085]
[0086] Purify the flue gas according to the above conditions, and it is detected that the desulfurization efficiency reaches 97%, and the denitration efficiency reaches 86%.
Embodiment 2
[0088] Liquid-phase composite oxidant: the concentration ratio of sodium chlorite and sodium persulfate is 0.1:5%wt, and the pH is 4.5.
[0089] Absorbent: sodium sulfite concentration of 5% wt, pH of 9.
[0090] The reaction conditions of the microwave-coupled ultraviolet photocatalytic oxidative desulfurization and denitrification system are shown in Table 3.
[0091] Table 3 Reaction conditions
[0092] condition scope microwave set temperature 90℃ Microwave set power 300W Photocatalyst reactor energy density 300KW / m 3
[0093] Purify the flue gas according to the above conditions, and it is detected that the desulfurization efficiency reaches 98%, and the denitration efficiency reaches 83%.
Embodiment 3
[0095] Liquid-phase composite oxidant: the concentration ratio of sodium chlorite and sodium persulfate is 0.05:10% wt, and the pH is 5.
[0096] Absorbent: sodium sulfite concentration of 5% wt, pH of 9.
[0097] The reaction conditions of the microwave-coupled ultraviolet photocatalytic oxidative desulfurization and denitrification system are shown in Table 4.
[0098] Table 4 Reaction conditions
[0099]
[0100]
[0101]Purify the flue gas according to the above conditions, and it is detected that the desulfurization efficiency reaches 98%, and the denitration efficiency reaches 87%.
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Abstract
The invention belongs to the technical field of flue gas purification, and discloses a microwave coupling ultraviolet photocatalytic oxidation desulfurization and denitration method. The method comprises the steps that NO gas and SO2 gas are mixed and diluted by nitrogen and oxygen and enter a SO2 pre-absorption system to remove the SO2 preliminarily, then the gases enter a microwave reactor whichsupplies microwaves and excites an inorganic lamp, and the temperature is raised simultaneously in the process to improve the oxidation efficiency of a liquid phase oxidizing agent; subsequently, a liquid phase composite oxidizing agent is subjected to catalyzed activation in a photocatalytic reactor, a variety of highly active free radicals are produced, and then the highly reactive free radicals oxidize NO; the newly formed nitrogen oxides are absorbed by a subsequent absorption device; and exhaust gas after absorption is finally discharged into the atmosphere. The microwave coupling ultraviolet photocatalytic oxidation desulfurization and denitration method can meet the latest ultra-low emission pollutant standards of thermal power plants. The treatment system is lower in capital construction and operation costs, can simultaneously perform desulfurization and denitrification process, reduces floor space, and is easy to operate, and the desulfurization and denitration effect is morerapid and efficient.
Description
technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a method for catalytic oxidation desulfurization and denitration of microwave coupled ultraviolet light. Background technique [0002] Coal-fired power plants release a lot of NO and SO during coal-fired power generation 2 Such toxic gases have caused serious adverse effects on humans and the environment. China is a big coal-burning country, NO and SO 2 and other toxic gas pollution is extremely serious, so the Chinese government has promulgated the "Air Pollutant Emission Standard for Thermal Power Plants" (GB 13223-2011) to reduce NO X , SO 2 , emissions. On July 27, 2014, a new ultra-low emission concept was implemented, that is, the emission concentrations of soot, sulfur dioxide and nitrogen oxides (baseline oxygen content of 6%) did not exceed 5mg / m2 respectively. 3 , 35mg / m 3 , 50mg / m 3 . Therefore, it is very necessary to seek an efficien...
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