CN104815538B - Up-down opposite spraying fluidized bed desulfurization and denitrification method for photolysis of peroxide - Google Patents
Up-down opposite spraying fluidized bed desulfurization and denitrification method for photolysis of peroxide Download PDFInfo
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Abstract
The invention relates to a photolysis peroxide up-down spraying fluidized bed desulfurization and denitrification method which is mainly provided with a discharge source, a fan, a dust remover, a flue gas cooler, an up-down spraying fluidized bed, a first circulating pump, a second circulating pump, a packing layer, an ultraviolet lamp tube, an atomizing nozzle, a demister, a liquid storage tank and a product post-treatment system. SO from an emission source2And the NO reacts with sulfate radicals and hydroxyl radicals generated by decomposing peroxide by ultraviolet light to generate sulfuric acid and nitric acid solution which can be recycled. The system can efficiently remove SO in the flue gas2And NO, and NO secondary pollution is generated in the removal process, so that the system is a novel flue gas purification system with wide application prospect.
Description
Technical Field
The invention relates to the field of air pollution control, in particular to a method for desulfurizing and denitrating an atomizing fluidized bed by photolyzing peroxide in an up-and-down mode.
Background
SO generated during combustion2﹑NOxAnd Hg can cause serious atmospheric pollution problems such as acid rain, photochemical smog, carcinogenesis and the like, and harm to human health and ecological balance. In the past decades, although a large number of flue gas desulfurization, denitrification and demercuration technologies are developed, various existing desulfurization, denitrification and demercuration technologies are developed at first only aiming at a single pollutant as a removal target, and the simultaneous removal of multiple pollutants cannot be realized.
For example, most of the currently applied flue gas desulfurization and denitration technologies mainly include a limestone-gypsum wet flue gas desulfurization technology and an ammonia selective catalytic reduction method. Although the two methods can be used for desulfurization and denitrification independently, the two methods cannot realize simultaneous removal in an upper spraying bed and a lower spraying bed. Although the two processes are used in a superposition manner, the simultaneous desulfurization and denitrification can be realized, but the defects of complex whole system, large floor area, high investment and operation cost and the like are caused. In addition, with the continuous improvement of the requirement of human on environmental protection, laws and regulations for controlling the emission of mercury in flue gas are gradually released, but no economical and effective flue gas demercuration technology is commercially applied on a large scale at present. If a separate flue gas demercuration system is added at the tail part of the existing desulfurization and denitration system, the initial investment and the operation cost of the whole system are further increased, and finally, the large-scale commercial application in developing countries is difficult to obtain.
In summary, if SO can be sprayed in one upper and lower pair of spraying beds2﹑NOxAnd Hg is removed simultaneously, so that the complexity and the occupied area of the system are expected to be greatly reduced, and the investment and the operating cost of the system are further reduced. Therefore, the development of cost-effective simultaneous sulfur/nitrogen/mercury removal technology is a current hotspot in the field.
Disclosure of Invention
The invention relates to a method for desulfurizing and denitrating an up-down spraying fluidized bed by photolyzing peroxide. SO from an emission source2NO and Hg0Is pre-oxidized into SO by ozone in the flue3﹑NO2And Hg2+. Ultraviolet lamp radiation ultraviolet light excitates peroxide to generate sulfate radical and hydroxyl radical for further oxidizing SO2﹑NO﹑Hg0And SO produced by ozone oxidation3And NO2The reaction products are mainly sulfuric acid, nitric acid and divalent mercury ions which can be recycled. The system can efficiently remove SO in the flue gas2NO and Hg0And the removal process has no secondary pollution, and the system is a novel flue gas purification system with wide application prospect.
The principle and reaction process of the method of the invention are as follows:
1, the generation of sulfate radicals and hydroxyl radicals in the system was determined by using an Electron Spin Resonance (ESR) apparatus, as shown in FIG. 1. Therefore, the light-irradiated peroxide firstly releases sulfate radicals and hydroxyl radicals having strong oxidizing properties, and the specific process can be represented by the following chemical reactions (1) to (5):
H2O2+UV→2·OH (1)
O3+UV→·O+O2 (3)
·O+H2O2→·OH+HO2· (6)
2. the generated sulfate radical and hydroxyl radical with strong oxidizing property can oxidize and remove sulfur/nitrogen/mercury in the flue gas:
a·OH+bSO2→cSO3++other products (7)
a·OH+bNO→cNO2++other products (8)
3. the sulfuric acid and nitric acid mixed solution generated by the reaction can be recycled as industrial raw materials (for example, ammonium sulfate and ammonium nitrate agricultural fertilizer are generated after ammonia is added for neutralization and are recycled). The system can efficiently remove SO in the flue gas2And NO, and NO secondary pollution is generated in the removal process, so that the system is a novel flue gas purification system with wide application prospect.
In order to realize the purposes of desulfurization and denitrification, based on the principle, the technical scheme adopted by the invention is as follows:
a photolysis peroxide up-down opposite spraying fluidized bed desulfurization and denitrification method is characterized in that flue gas of an emission source is introduced into a dust remover through a fan, enters a flue gas cooler after being dedusted by the dust remover, enters an up-down opposite spraying fluidized bed from the bottom after being cooled by the flue gas cooler, and is opposite to the temperature of a flue gas inlet of the spraying fluidized bed up and downThe temperature is 20-70 ℃, and the effective liquid-gas ratio is 0.1-5.0L/m3(ii) a The liquid storage tank atomizes peroxide solution in the liquid storage tank through an atomizing nozzle by a first circulating pump, then sprays the peroxide solution into an upper spraying fluidized bed and a lower spraying fluidized bed, the peroxide solution after reaction is introduced into the liquid storage tank through a second circulating pump for recycling, the concentration of the peroxide is 0.1-3.5 mol/L, the pH value of the solution is 1.0-9.5, the temperature of the solution is 20-70 ℃, the upper atomizing nozzle and the lower atomizing nozzle of the spraying fluidized bed are oppositely arranged, the atomized peroxide solution is sprayed and impacted, an ultraviolet lamp tube is arranged in the middle of the oppositely arranged atomizing nozzles, ultraviolet light emitted by the ultraviolet lamp excites the peroxide to generate hydroxyl radicals, and SO in oxidation flue gas is oxidized2And NO, the effective radiation intensity of the ultraviolet light is 10 mu W/cm2-400μW/cm2The effective wavelength of the ultraviolet ray is 150nm-365 nm; the purified flue gas is discharged from a top flue gas outlet of the upper and lower spraying fluidized beds; and introducing a reaction product generated after the reaction into a product post-treatment system through a product outlet d of the upper spraying fluidized bed and the lower spraying fluidized bed, wherein the contents of SO2 and NO in the flue gas are respectively not higher than 10000ppm and 2000 ppm.
Too high a flue gas inlet temperature can lead to premature self-decomposition waste of peroxide, but if the flue gas inlet temperature is too low, the chemical reaction rate can be reduced, thereby reducing the pollutant removal efficiency. The temperature of 20-70 ℃ is the optimal flue gas inlet temperature obtained by the inventor according to orthogonal experiments and comprehensive analysis, the decomposition rate of peroxide is greatly increased after the flue gas inlet temperature exceeds 70 ℃, but the chemical reaction rate is obviously reduced when the flue gas inlet temperature is lower than 20 ℃, so that the removal efficiency of pollutants is greatly reduced. Therefore, the optimum flue gas inlet temperature for the upper and lower spray fluidized beds is 20-70 ℃.
The liquid-gas ratio is too low, the pollutant removal efficiency is too low, and the environmental protection requirement cannot be met, but the liquid-gas ratio is too high, and the energy consumption of the system is greatly increased due to the overlarge power of the circulating pump. The inventor finds that the effective liquid-gas ratio is 0.1-5.0L/m through systematic experiments and theoretical researches3. Peroxide concentrations that are too low to release sufficient free radical oxidative contaminant removal, but a single dosing of peroxide at too high a concentration can result in additional self-decomposition and side reactions, which can lead to peroxideThe consumption of the oxidant is serious, the operation cost is increased, and side reactions can cause various harmful components in reaction products to influence the recycling of final products. After the experiments and detection analysis of the inventor, the optimal concentration of the peroxide is 0.1mol/L-3.5 mol/L.
Too high pH of the peroxide solution can lead to the accelerated self-decomposition of the peroxide and consumption, and increase the application cost, but too low pH can inhibit the chemical absorption balance, so that the pollutant removal efficiency is kept at a low level, and the environmental protection index cannot be met. The inventor finds that the optimal pH value of the solution is between 1.0 and 9.5 after systematic experimental research, theoretical research and detection analysis. Too high a solution temperature can cause premature self-decomposition of the peroxide, wasting expensive oxidant, but if the solution temperature is too low, the chemical reaction rate can be reduced, thereby reducing the contaminant removal efficiency. The decomposition rate of the peroxide is greatly increased after the solution temperature exceeds 70 ℃, but the chemical reaction rate is obviously reduced when the solution temperature is lower than 20 ℃, so that the removal efficiency of the pollutants is greatly reduced. Therefore, the optimum solution temperature for the upper and lower spray beds is 20-70 ℃.
The inventor adopts the electron spin resonance technology to detect, and finds that the effective radiation intensity of the ultraviolet light is too low to generate free radicals with sufficient concentration to oxidize and remove pollutants, but the radiation intensity of the ultraviolet light is too high to greatly improve the energy consumption of the system and reduce the economy of the system. Therefore, the effective radiation intensity of the ultraviolet light is 10 muW/cm2-400μW/cm2If the effective wavelength of the ultraviolet light is selected to be too short, the propagation distance of the ultraviolet light in the reactor is too short, the pollutant treatment capacity under unit power is greatly reduced, and the basic treatment requirement cannot be met, but if the wavelength of the ultraviolet light is selected to be too long, the energy of ultraviolet photons is obviously reduced, and the ultraviolet photons with low energy cannot damage the molecular bonds of peroxide, so that the free radical with sufficient concentration cannot be generated to oxidize and remove the pollutants. After comprehensive detection and analysis, the effective wavelength of the ultraviolet rays is 150nm-365 nm.
The inventor discovers that SO in the flue gas is detected after systematic experiments and detection analysis2﹑NOxToo high a content ofWill result in great reduction of the removal efficiency and unabsorbed middle SO at the tail part2﹑NOxThe escape amount is greatly increased, and serious secondary pollutants are easily caused, SO that research shows that SO in the flue gas2And NO content of not more than 10000ppm and 2000ppm, respectively.
Preferred technical parameter, SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively; the temperature of the flue gas inlet of the upper spraying fluidized bed and the lower spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of ammonium persulfate is 3.0mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. By adopting the parameters, the bench test result is that SO in the flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 100 percent respectively.
The peroxide comprises one or a mixture of two of hydrogen peroxide and ammonium persulfate. The emission source comprises one or more of coal-fired boiler, internal combustion engine, industrial kiln, smelting/coking tail gas, garbage incinerator and petrochemical equipment tail gas.
The device based on the photolysis peroxide up-down pair spraying fluidized bed desulfurization and denitrification method is provided with a discharge source, a fan, a dust remover, a flue gas cooler, an up-down pair spraying fluidized bed, a first circulating pump, a second circulating pump, a liquid storage tank and a product post-treatment system; the upper and lower pair of spraying fluidized beds are sequentially provided with a flue gas outlet, a demister, an atomizing nozzle, an ultraviolet lamp tube, a packing layer and a bottom outlet from top to bottom; the discharge source is connected with the inlet of the dust remover through a flue, the outlet of the dust remover is connected with the inlet of the flue gas cooler, the outlet of the flue gas cooler is connected with the bottoms of the upper spraying fluidized bed and the lower spraying fluidized bed, the liquid storage tank enters the upper spraying fluidized bed and the lower spraying fluidized bed through a pipeline, and at least one group of vertically symmetrical atomizing nozzles are arranged on the pipeline; ultraviolet lamp tube banks are arranged between the vertically symmetrical atomizing nozzles in the vertically paired atomizing fluidized bed.
A first circulating pump for introducing the peroxide solution into the spraying fluidized bed is arranged on a pipeline of the liquid storage tank, which enters the spraying fluidized bed and is opposite to the spraying fluidized bed from top to bottom; and a second circulating pump for introducing the peroxide solution into the liquid storage tank is arranged at the solution outlet of the upper spraying fluidized bed and the lower spraying fluidized bed.
The section of the upper and lower spraying fluidized bed is square or rectangular, more than one group of ultraviolet lamp tube banks are arranged inside the spraying fluidized bed, the upper and lower parts of each group of ultraviolet lamp tube banks are respectively provided with an atomizing nozzle, the atomizing nozzles on the upper parts of the ultraviolet lamp tube banks spray solution downwards, and the atomizing nozzles on the lower parts of the ultraviolet lamp tube banks spray solution upwards. The distance A between two adjacent groups of ultraviolet lamp tube rows is between 10cm and 50 cm. The distance B between two adjacent ultraviolet lamp tubes in the ultraviolet lamp tube row is between 3cm and 30cm so as to achieve the optimal light radiation effect. One end (right end) of the ultraviolet lamp tube is inserted and fixed in the upper and lower spraying bed walls, and the other end (left end) penetrates through the upper and lower spraying bed walls and is reserved for more than 1cm, so that the ultraviolet lamp tube can be conveniently replaced and maintained. The optimal number of ultraviolet lamp tubes arranged in the vertical direction (up-down direction) of each group of ultraviolet lamp tube rows is 5-10, and the optimal number of ultraviolet lamp tubes arranged in the horizontal direction can be determined by calculating the sectional area of the upper and lower spraying fluidized beds and the selected ultraviolet lamp tube spacing.
Of particular note are: the various selected optimization parameters are obtained by the inventor through a large number of comprehensive experiments, theoretical calculation and detection analysis. Since each operating parameter is also typically influenced or perturbed by a combination of one or more other parameters, it cannot be obtained by simple field single factor experimentation or literature comparison. In addition, the optimization parameters provided by the invention are determined after comprehensive comparison between the small-sized equipment and the amplified equipment, and the amplification effect possibly generated in the amplification process of the equipment is comprehensively considered, so that field technicians cannot obtain safe and reliable optimization parameters by simply analyzing the existing equipment and then conjecturing.
The invention has the advantages and obvious effects that:
chinese patent 201010296492.5 proposes a simultaneous desulfurization and denitrification system using light to radiate hydrogen peroxide to generate free radicals, but the removal process described in the patent adopts a bubble column reactor with very low mass transfer rate and low market application potential, and the upper and lower spray beds proposed by the present invention have better mass transfer rate and removal efficiency, thereby greatly improving the removal efficiency of pollutants. For example, the system of the present invention can implement SO2And NO, the excellent removal performance of the system is demonstrated by the 100% removal rate of the two pollutants.
Drawings
FIG. 1 shows electron spin resonance diagrams of photolytic peroxide up and down on a spray fluidized bed.
FIG. 2 is a process flow diagram of the system of the present invention.
FIG. 3 is a schematic view of the upper and lower spray fluidized beds.
FIG. 4 is a cross-sectional view of the fluidized bed and the arrangement of the lamps.
Figure 5 is a product post-treatment system of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in figure 2, the invention relates to a device based on a photolysis peroxide up-and-down spraying fluidized bed desulfurization and denitrification method, which is mainly provided with an emission source 1, a fan 2, a dust remover 3, a flue gas cooler 4, an up-and-down spraying fluidized bed 6, a first circulating pump 7, a second circulating pump 8, a packing layer 13, an ultraviolet lamp tube 12, an atomizing nozzle 11, a demister, a 10 liquid storage tank 9 and a product post-treatment system 5. The upper and lower pair of spraying fluidized beds 6 are sequentially provided with a flue gas outlet c, a demister 10, an atomizing nozzle 11, an ultraviolet lamp tube 12, a packing layer 13 and a bottom outlet d from top to bottom; the emission source 1 is connected with an inlet of a dust remover 3 through a flue, and a fan 2 is arranged between the emission source 1 and the dust remover 3; the outlet of the dust remover 3 is connected with the inlet of the flue gas cooler 4, the outlet of the flue gas cooler 4 is connected with the bottoms of the upper and lower spraying fluidized beds 6, the liquid storage tank 9 is connected with the atomizing nozzles 11 in the upper and lower spraying fluidized beds 6 through a pipeline, and at least one group of atomizing nozzles 11 which are symmetrical up and down are arranged on the pipeline; an ultraviolet lamp tube bank consisting of ultraviolet lamps 12 is arranged between the vertically symmetrical atomizing nozzles 11 in the vertically opposite spraying fluidized bed 6.
As shown in fig. 3 and 4, the section of the upper and lower opposing spray fluidized bed 6 is square or rectangular, more than one group of ultraviolet lamp tube rows are arranged in the interior, and the upper and lower parts of each group of ultraviolet lamp tube rows are provided with the atomizing nozzles 11; the atomizing nozzle 11 at the upper part of the ultraviolet lamp tube bank sprays the solution downwards, and the atomizing nozzle 11 at the lower part of the ultraviolet lamp tube bank sprays the solution upwards.
The distance A between two adjacent groups of ultraviolet lamp tube rows is between 10cm and 50 cm; the distance B between two adjacent ultraviolet lamp tubes in the ultraviolet lamp tube row is between 3cm and 30 cm.
As shown in fig. 5, in the product post-treatment system of the method, the product post-treatment system 5 is connected with the product outlets d at the bottoms of the upper and lower spray fluidized beds 6, the product post-treatment system 5 is provided with a solution circulating pump 14, the product post-treatment system 5 is sequentially connected with a neutralization tower 15 and an evaporative crystallization tower 16, and the evaporative crystallization tower 16 is heated by a flue gas waste heat system 17; the ammonium sulfate and the ammonium nitrate agricultural fertilizer are finally produced and recycled by adding ammonia to neutralize in the neutralizing tower 14, and entering the evaporative crystallization tower 16 for evaporative crystallization after neutralization.
The reaction process is as follows: the flue gas from the emission source 1 is drawn by a fan 2, is dedusted by a deduster 3 and cooled by a flue gas cooler 4, and is distributed by a packing layer 13 to enter an upper and lower opposite spraying fluidized bed 6. The peroxide solution from the reservoir 9 is pumped by the first circulation pump 7 and atomized by the atomizing nozzle 11 and sprayed into the upper and lower pair of atomizing beds 6. Ultraviolet lamp 12 radiates ultraviolet light to excite peroxide to generate sulfate radical and hydroxyl radical to oxidize SO2And NO to produce sulfuric acid and nitric acid solution which can be recycled. The sulfuric acid and nitric acid solution which falls back from the upper part of the spraying fluidized bed 6 from top to bottom is sucked into the liquid storage tank 9 again through the circulating pump II 8 for circulating atomization spraying from the outlet b. The reaction product is introduced into the product post-treatment system 5 from the upper and lower product outlets d of the spray fluidized bed 6 to realize resource utilization.
Example 1 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of hydrogen peroxide is 1.0mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 40 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 70.2 percent respectively.
Example 2 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower opposite spray fluidized bed flue gas inlet is 55 ℃, and the liquid and gas temperatures are respectivelyThe ratio is 1.0L/m3The concentration of ammonium persulfate is 1.0mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 40 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 67.4 percent respectively.
Example 3 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of hydrogen peroxide is 1.5mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 40 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 79.9 percent respectively.
Example 4 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of ammonium persulfate is 1.5mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 40 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 76.5 percent respectively.
Example 5 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of hydrogen peroxide is 1.5mol/L, the pH of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 88.3 percent respectively.
Example 6 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of ammonium persulfate is 1.5mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And NOWhile the removal efficiency can reach 100% and 86.3% respectively.
Example 7 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of hydrogen peroxide is 2.0mol/L, the pH of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 95.7 percent respectively.
Example 8 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of ammonium persulfate is 2.0mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 93.9 percent respectively.
Example 9 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of hydrogen peroxide is 3.0mol/L, the pH of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 100 percent respectively.
Example 10 SO in flue gas2The NO concentrations are 3000ppm and 400ppm respectively, the temperature of the upper and lower flue gas inlets facing the spraying fluidized bed is 55 ℃, and the liquid-gas ratio is 1.0L/m3The concentration of ammonium persulfate is 3.0mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82 mu W/cm2The effective wavelength of ultraviolet light is 254 nm. The bench test results are: SO in flue gas2And the simultaneous removal efficiency of NO can reach 100 percent and 100 percent respectively.
As can be seen from the comprehensive comparison of the above examples, examples 9 and 10 have the best desulfurization and denitrification effects, and can be referred to as the best examples.
Claims (4)
1. A photolysis peroxide up-down spraying fluidized bed desulfurization and denitrification method is characterized in that flue gas of an emission source is introduced into a dust remover through a fan, enters a flue gas cooler after being dedusted by the dust remover, enters an up-down spraying fluidized bed from the bottom after being cooled by the flue gas cooler, the inlet temperature of the flue gas of the up-down spraying fluidized bed is 20-70 ℃, and the effective liquid-gas ratio is 0.1-5.0L/m3(ii) a The liquid storage tank atomizes peroxide solution in the liquid storage tank through an atomizing nozzle by a first circulating pump, then sprays the peroxide solution into an upper spraying fluidized bed and a lower spraying fluidized bed, the peroxide solution after reaction is introduced into the liquid storage tank through a second circulating pump for recycling, the concentration of the peroxide is 0.1-3.5 mol/L, the pH value of the solution is 1.0-9.5, the temperature of the solution is 20-70 ℃, the upper atomizing nozzle and the lower atomizing nozzle of the spraying fluidized bed are oppositely arranged, the atomized peroxide solution is sprayed and impacted, an ultraviolet lamp tube is arranged in the middle of the oppositely arranged atomizing nozzles, ultraviolet light emitted by the ultraviolet lamp excites the peroxide to generate hydroxyl radicals, and SO in oxidation flue gas is oxidized2And NO, an effective radiation intensity of ultraviolet light of 10-400The effective wavelength of ultraviolet ray is 150nm-365 nm; the purified flue gas is discharged from a top flue gas outlet of the upper and lower spraying fluidized beds; introducing a reaction product generated after the reaction into a product post-treatment system from a product outlet of the upper spraying fluidized bed and a product outlet of the lower spraying fluidized bed; SO in flue gas2And NO content of not more than 10000ppm and 2000ppm, respectively.
2. The method of claim 1, wherein the inlet temperature of the flue gas is 55 ℃ and the liquid-gas ratio is 1.0L/m3The concentration of ammonium persulfate is 3.0mol/L, the pH value of the solution is 3.5, the temperature of the solution is 50 ℃, and the effective radiation intensity of ultraviolet light is 82The effective wavelength of ultraviolet light is 254 nm.
3. The photolytic peroxide up-down spray fluidized bed desulfurization and denitrification method according to claim 1, wherein the photolytic peroxide up-down spray fluidized bed desulfurization and denitrification method comprises the following steps: the peroxide comprises one or a mixture of two of hydrogen peroxide and ammonium persulfate.
4. The photolytic peroxide up-down spray fluidized bed desulfurization and denitrification method according to claim 1, wherein the photolytic peroxide up-down spray fluidized bed desulfurization and denitrification method comprises the following steps: the emission source comprises one or more of coal-fired boiler, internal combustion engine, industrial kiln, smelting/coking tail gas, garbage incinerator and petrochemical equipment tail gas.
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| US9574122B2 (en) * | 2009-04-14 | 2017-02-21 | Uniboard Canada Inc. | Process for reducing the content of water soluble volatile organic compounds in a gas |
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| CN103638796A (en) * | 2013-12-13 | 2014-03-19 | 江苏大学 | System and method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate |
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