Method for purifying flue gas through activating persulfate by ozone, and apparatus thereof
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A technology for activating persulfate and flue gas purification, which is applied to chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of initial investment and operation cost increase, and achieve simple and reliable equipment, no secondary pollution, The effect of broad application prospects
Active Publication Date: 2014-09-17
JIANGSU UNIV
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[0005] If separate flue gas mercury removal, VOCs removal and H removal are added at the end of the existing desulfurization and denitrification system 2 The S system will inevitably cause a further sharp increase in the initial investment and operating costs of the entire system, and it will be difficult to obtain large-scale commercial applications in developing countries.
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Embodiment 1
[0051] Example 1. SO in flue gas 2 ﹑NO x ﹑ H 2 S﹑Hg 0 and VOCs concentrations are 2000ppm, 400ppm, 200ppm, 50ug / m 3 and 100mg / m 3 , the flue gas temperature is 25°C, the molar concentration of ammonium persulfate is 1.0mol / L, the ozone injection concentration is 100ppm, and the liquid-gas ratio is 5L / m 3 , The ozone injection distance is 50cm. SO in flue gas 2 ﹑NO x ﹑ H 2 S﹑Hg 0The simultaneous removal efficiencies of VOCs and VOCs were 100%, 60.9%, 100%, 78.8% and 38.2%, respectively.
Embodiment 2
[0052] Example 2. SO in flue gas 2 ﹑NO x ﹑Hg 0 and VOCs concentrations are 2000ppm, 400ppm, 200ppm, 50ug / m 3 and 100mg / m 3 , the flue gas temperature is 25°C, the molar concentration of potassium persulfate is 1.0mol / L, the ozone injection concentration is 100ppm, and the liquid-gas ratio is 10L / m 3 , The ozone injection distance is 50cm. SO in flue gas 2 ﹑NO x ﹑ H 2 S﹑Hg 0 The simultaneous removal efficiencies of VOCs and VOCs were 100%, 68.9%, 100%, 85.7% and 48.6%, respectively.
Embodiment 3
[0053] Example 3. SO in flue gas 2 ﹑NO x ﹑ H 2 S﹑Hg 0 and VOCs concentrations are 2000ppm, 400ppm, 200ppm, 50ug / m 3 and 50mg / m 3 , the flue gas temperature is 35°C, the molar concentration of sodium persulfate is 1.5mol / L, the ozone injection concentration is 300ppm, and the liquid-gas ratio is 25L / m 3 , The ozone injection distance is 100cm. SO in flue gas 2 ﹑NO x ﹑ H 2 S﹑Hg 0 The simultaneous removal efficiencies of VOCs and VOCs were 100%, 86.9%, 100%, 94.6% and 68.9%, respectively.
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Abstract
The invention discloses a method for purifying flue gas through activating persulfate by ozone, and an apparatus thereof. Ozone in the flue gas contacts with persulfate in a solution in a bubbling-spray two stage reactor to generate sulfate radicals and hydroxy groups having strong oxidizability in order to oxidize and remove SO2, NOx, mercury, H2S and VOCs in the flue gas; and a reaction product solution enters a mercury separation tower to remove mercury, a mercury removed sulfuric acid and nitric acid solution enters an ammonia feeding tower, an ammonium sulfate and ammonium nitrate solution generated through the above reaction enters a product crystallization tower, and a flue gas waste heat utilizing device is used to evaporate and crystal recyclable agricultural fertilizers ammonium sulfate and ammonium nitrate. In the invention, ozone is adopted to induce persulfate to generate the sulfate radicals and hydroxy groups having extremely strong oxidizability, and the oxidbillities of the sulfate radicals and the hydroxy groups are second to that of fluorine, and are far higher than that of single ozone or persulfate, so the five pollutants can be efficiently simultaneously removed.
Description
technical field [0001] The invention relates to the control of flue gas emission pollutants in the combustion process, in particular to an ozone-activated persulfate flue gas purification method and device. Background technique [0002] SO produced by combustion 2 ﹑NO x ﹑Hg﹑H 2 S and VOCs can cause serious hazards such as acid rain, photochemical smog, carcinogenicity, and teratogenicity. Therefore, the development of effective flue gas desulfurization, denitrification, mercury removal, VOCs and H removal 2 Method S is one of the important tasks of environmental protection scientists and technicians in various countries. [0003] In recent years, although people have developed a large number of flue gas desulfurization, denitrification, mercury, VOCs and H 2 S technology, but due to the limitations of human cognition process and the gradual development of science and technology, the existing various desulfurization, denitrification, mercury, VOCs and H 2 At the beginni...
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