CN212348293U - Denitration system for flue gas denitration by using ozone and spray tower - Google Patents
Denitration system for flue gas denitration by using ozone and spray tower Download PDFInfo
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- CN212348293U CN212348293U CN202020200395.0U CN202020200395U CN212348293U CN 212348293 U CN212348293 U CN 212348293U CN 202020200395 U CN202020200395 U CN 202020200395U CN 212348293 U CN212348293 U CN 212348293U
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Abstract
The invention discloses a denitration system for denitration of flue gas by using ozone and a spray tower, which comprises the spray tower, an ozone supply system and a soluble alkali liquor supply system, wherein a sprayer is arranged in the spray tower, the denitration system also comprises a mixer for the ozone and the soluble alkali liquor, an ozone inlet pipe and a soluble alkali liquor inlet pipe are respectively connected with the mixer, the ozone supply system conveys the ozone to the mixer through the inlet pipe, the soluble alkali liquor supply system conveys the soluble alkali liquor into the mixer through the liquor inlet pipe, the mixer is connected with the sprayer, and the ozone and the soluble alkali liquor are oppositely sprayed to the flue gas through a nozzle of the sprayer after being mixed in the mixer. The invention overcomes the technical prejudice, unexpected technical effect, and great economic and social benefits.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a denitration system for flue gas denitration by utilizing ozone and a spray tower.
Background
Coal-fired power generation, steel mill steelmaking and other processes taking coal and petroleum as heat sources are one of the main sources of nitrogen oxide increase in the environment. In order to reduce the influence on the environment, various manufacturers adopt various methods to reduce the emission of nitrogen oxides in the combustion tail gas (the flue gas), namely, the flue gas is subjected to denitration treatment. The existing flue gas denitration technology mainly comprises two main types, namely a catalytic reduction method and an oxidation method. Compared with a catalytic reduction method, the oxidation method theoretically has the advantages of simple process, low cost and the like, so that the method becomes the research and research direction in the field of flue gas denitration at present. Ozone is a strong oxidant, is simple to produce, is a clean oxidant, and naturally becomes the object of choice in the oxidation process. The prior art discloses a plurality of technical schemes for denitration of flue gas by ozone. Such as CN109210955A, CN 109224820A, CN109173662A, CN108404616A, CN 109675421A, CN 109621662 a, etc., all disclose the use of ozone for flue gas denitration. However, the prior art also indicates that there are technical difficulties in the denitrification with ozone, as disclosed in CN 109621662A, O3Although a common strong oxidizer, O is3The direct oxidation reaction has higher selectivity, slower reaction rate and low utilization rate. CN108905555A discloses3Is unstable, slowly decomposes at room temperature, and rapidly decomposes at 200 ℃. More importantly, the actual conditions of the flue gas, such as higher temperature (about 100-300 ℃), lower pressure (about kilopascal level, even negative pressure), low concentration of nitric oxide (about tens-500 mg/m)3) Faster flow rates (about 1-10 m/s), etc. can greatly affect the presence of ozone and its effect on the oxidation of NO. In the actual process, the ozone oxidation method cannot be popularized and applied in a large range because of poor effect. To increase the oxidation effect, it is usual in the prior art to useThe use of increasing the ozone input will increase the cost and cannot be popularized.
Disclosure of Invention
In order to solve the technical problems that ozone is easy to decompose and low in oxidation effect in flue gas, the invention provides a denitration system for flue gas denitration by using ozone and a spray tower, which comprises the following steps:
the utility model provides an utilize ozone and spray column to carry out denitration system of flue gas denitration, including the spray column, ozone supply system, soluble alkali lye supply system, set up the spray thrower in the spray column, a serial communication port, denitration system still includes the blender of ozone and soluble alkali lye, ozone intake pipe and soluble alkali lye feed liquor pipe connect the blender respectively, ozone supply system carries the blender with ozone through the intake pipe, soluble alkali lye supply system carries the blender with soluble alkali lye through the feed liquor pipe, the blender is reconnected to the sprayer, ozone and soluble alkali lye mix the back in the blender, nozzle subtend through the sprayer spouts to the flue gas.
Preferably, two or more sets of mixers and sprayers are provided in the spray tower.
Preferably, the mixer is a section of a nozzle connected to the nozzle.
Preferably, one or more additional sprayers are arranged above the sprayers, the nozzles of the sprayers are directly connected with the liquid inlet pipe of the soluble alkali liquor, and the nozzles only spray out the soluble alkali liquor.
Preferably, the tower shell of the spray tower is a section of flue.
Preferably wherein the mixer is located in close proximity to the nozzle.
The invention content is explained in the following with the prior art:
(I) the experimental analysis and theoretical analysis of the invention
1. Experimental conditions
In the case of comparative examples 1 (1) and (2), ozone was directly introduced into the flue gas in the flue provided outside the spray tower. And the sprayer in the spray tower is closed, and no alkali liquor is sprayed out. The result shows that the ozone is directly introduced into the flue gas, the oxidation of NO in the flue gas is limited, and the oxidation rate does not exceed 10%.
In the case of the embodiment, the ozone and the soluble alkali liquor are mixed in the mixer and then sprayed into the flue gas passing through the spray tower by the sprayer. In the embodiment, the ozone has very obvious effect of removing NO in the flue gas, and the effect reaches more than 80%.
2. Theoretical analysis
O3As a strong oxidant, the standard electrode potential can be as high as 2.07mv, which is higher than oxidants such as hydrogen peroxide, potassium permanganate, chlorine dioxide, etc. However, in comparative examples 1 and 2, the effect of ozone on the oxidation of NO was very limited. The reason for this phenomenon has been analyzed in the prior art, for example, in CN 109621662A, O3The direct oxidation reaction has higher selectivity and slower reaction rate; or CN108905555A discloses3Is unstable, slowly decomposes at room temperature, and rapidly decomposes at 200 ℃. But this analysis is difficult to interpret satisfactorily.
The applicant believes that the failure of ozone to oxidize NO in flue gas is not only due to the oxidising nature of ozone but also to NO and NO2And the actual condition of the flue gas.
(1) The ozone is directly introduced into the flue gas because of the characteristics of the flue gas, such as higher temperature (about 100-300 ℃), lower pressure (about kilopascal grade, even negative pressure), and low concentration of nitric oxide (about tens-500 mg/m)3) Ozone is decomposed very quickly due to the high flow rate (about 1-10 m/s), and O generated by decomposition are easy to react first compared with O and NO, so that the effective components of ozone are reduced, and the oxidation of NO is not facilitated.
O3 → O2 + O
O + O → O2
(2) The more likely reasons are:
NO and NO2The transformation relationship of (1). Applicants believe that NO is not readily converted to NO at higher temperatures, lower pressures, and lower concentrations of NO2Or N after conversionO2And immediately converted to NO. Thus, even if NO in the flue gas can be replaced by O3Oxidation, the amount of NO does not change much in the final flue gas. Comparative examples 1 and 2 are very good illustrations.
O3 + NO→ NO2 + O2
NO2→ O + NO
O + O → O2
The reason why NO in the examples can be removed efficiently is that:
(1) the decomposition of ozone in the presence of an alkaline solution will enhance the oxidation of NO, thereby facilitating removal.
The factors responsible for ozonolysis are many, of which the most significant factor is OH-Ions and temperature. As mentioned above, when ozone is decomposed in flue gas (temperature factor), the available oxygen is reduced, which is not beneficial to NO oxidation. However, it is also possible to distinguish when ozone is decomposed in the presence of a soluble lye. Fangmin et al, in the ozone water stability study, indicate that soluble alkali solution can play a catalytic role, resulting in O3Decomposition occurs quickly.
For the purposes of the present invention, O3Decomposition occurs in the presence of soluble alkali liquor, and O is not reduced3The oxidation effect of NO is also enhanced. This is because: the decomposition products thereof are generated by free monatomic O with stronger oxidizability, and the monatomic O has better capability of oxidizing NO.
Moreover, because of the separation effect between O and O in the soluble alkali liquor due to the existence of liquid, O is not immediately combined into O2Thus, the possibility of NO oxidation is greater.
O3→ O2 + O
NO + O → NO2
Moreover, different from the prior art, after NO in the flue gas is oxidized, because the NO is directly contacted with the soluble alkali liquor, the oxidized nitrogen oxide with a high valence state can be immediately absorbed by the soluble alkali liquor:
3NO2 +2 OH-→ NO3 - + NO + H2O
NO2 + NO + 2OH-→ 2NO2 - + H2O
therefore, the ozone and the soluble alkali liquor are mixed firstly, namely the ozone is firstly decomposed by the catalysis of the soluble alkali liquor and then NO in the flue gas is removed by oxidation, which is the characteristic of the invention different from the prior art.
(2) Of course, undecomposed ozone may also participate in the oxidation of NO in the flue gas:
O3 + NO→ NO2 + O2
however, as in the case of oxidation of O, when oxidized by ozone, it is also in direct contact with soluble alkali liquor, and the oxidized nitrogen oxides in high valence state are immediately absorbed by the soluble alkali liquor:
3NO2 +2 OH-→ NO3 - + NO + H2O
NO2 + NO + 2OH-→ 2NO2 - + H2O
the technical means that NO in the flue gas is oxidized and absorbed at the same time is different from the prior art.
(II) spray tower
The spray tower is a place for realizing the technical idea in the denitration system. Except the arrangement position of the ozone distributor in the ozone conveying system, other structures of the spray tower are the prior art and mainly comprise: tower shell, spray thrower, liquid delivery and circulation system, flue gas import and export etc.. The sprayer consists of one or more nozzles which can be uniformly arranged along the cross section of the spray header, and the nozzles have the function of converting liquid into liquid drops or spraying the liquid drops after atomization under the action of internal liquid (or liquid and gas) pressure.
In a preferred scheme, for low-cost modification of the existing flue gas emission process, the tower shell of the spray tower is replaced by a section of flue, and the scheme is particularly suitable for modification treatment of sintering flue gas in a steel plant and flue gas in a power plant.
(III) ozone supply system
Ozone is generated by an ozone generator. The ozone generator can be a high-voltage discharge type ozone generator which is purchased or customized in the market. The oxygen source can be pure oxygen, and air can be directly used as the oxygen source for saving cost. It should be noted that, in the actual process, no matter ozone is generated by a pure oxygen source or an air source, pure ozone only occupies a certain proportion of gas, the proportion of the pure oxygen source is high, and the proportion of the air source is low. Thus, the present invention relates to processes using ozone, and the concept of ozone also includes ozone-containing gases.
The ozone supply system comprises an ozone generator, a gas booster pump, a valve, an air inlet pipe and the like. Serving to supply ozone to the mixer.
The supply amount of ozone is specifically determined according to the content of NO in the flue gas and the ratio of ozone to NO.
Theoretically, 1 mole of ozone could oxidize and absorb more than 1 mole of NO according to the aforementioned reaction formula. However, considering the actual working condition, the molar ratio of the ozone to the NO is taken as follows: 1-2:1. The ozone generators are then purchased, or customized accordingly.
(IV) soluble alkali liquor supply system
The soluble alkali is a substance capable of ionizing hydroxide ions in water, and specifically includes substances capable of dissolving in water and ionizing hydroxide ions in water, such as sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonia, alcohol amine, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, and urea.
The soluble alkali liquor refers to an aqueous solution of soluble alkali or a mixture of the aqueous solution and part of soluble alkali.
The system comprises a lye tank, a pressure pump, a valve, a liquid inlet pipe and the like. The function is to convey the soluble alkali liquor to a mixer and/or a sprayer and then spray the soluble alkali liquor to the flue gas through a nozzle. And the sprayed alkali liquor is collected to an alkali liquor tank and then is conveyed to a nozzle by a pressure pump for catalysis and absorption again. If the pH is lowered, a soluble base may be added for adjustment. The reaction product may be periodically withdrawn from the lye tank. A better definition of this system is: a soluble alkali liquor supply and circulation system.
The dosage of the soluble alkali liquor is determined according to the amount of nitrogen oxides in the flue gas, the concentration value of the alkali liquor and other factors. Experiments show that when the pH value reaches 9, the nitrogen oxide in the flue gas can be oxidized and absorbed, and under the condition that other conditions are not changed, the larger the pH value is, the better the removal effect of the nitrogen oxide is. The pH value is preferably in the range of 12 to 14 from the viewpoint of cost.
The soluble alkali liquor plays three roles: 1. an environment is provided for the oxidation and absorption of NO, and ozone has a good denitration effect only in an alkali liquor environment; 2. catalytically decomposing ozone; 3. absorbing the high valence nitrogen oxides. It is a third function that can directly consume the soluble base. The amount of soluble base required for this function may be determined based on the amount of nitrogen oxides in the flue gas. According to the preceding formula, theoretically, the ratio of the amount of soluble base to nitrogen oxides is less than 1: 1. however, in order to perform three functions better, in practical applications, the input amount of the soluble base is larger than the theoretical value. For example, the unit input amount of the soluble alkali can be more than 2, 4 or even 10 times of the corresponding nitrogen oxide amount.
(V) mixer
The mixer is a closed cavity and is used for providing a place for mixing ozone and soluble alkali liquor. The mixer can be a single container or a section of connecting pipe. Figure 4 shows two structural forms of the liquid mixer, ozone and soluble alkali liquor respectively enter the mixer and flow out from the outlet after mixing.
The invention has the beneficial effects that:
1. the ozone is used for flue gas denitration, and the cost is low and the efficiency is high;
2. the ozone is denitrified in the alkali liquor environment, so that the technical bias is overcome, and unexpected technical effects are achieved;
3. compared with the prior art, the flue gas does not need to be heated, and air can be used as an air source, so that the method has great cost advantage;
4. the prior flue gas emission process can be used for denitration by slightly modifying, and has great economic and social benefits.
Drawings
FIG. 1: the flow and system structure of embodiment 1 are schematically illustrated.
FIG. 2: the flow and system structure of embodiment 2 are schematically illustrated.
FIG. 3: flow and system structure schematic diagram of the comparative example.
FIG. 4: two structural forms of the mixer.
Detailed Description
Example 1
The invention is described with reference to the accompanying figure 1:
the flue gas is the sintering flue gas of a sintering workshop of a certain steel mill. The initial flue gas parameters are: the temperature of the smoke is 135-137 ℃, the humidity of the smoke is 0.01-0.03 percent, and the NO content is 174-183mg/m3Total nitrogen oxide content 273-296mg/m3Oxygen content is 14-16%, and flue gas flow is 904m3/h。
The ozone generator 3 is OZ type air source ozone generator produced by ozone purification equipment of Qingdao Zhongdao, the ozone production is 500g/h, the ozone concentration is 18-30g/m3And 3 ozone generators are selected according to the ozone demand. The soluble alkali solution is 0.1M sodium hydroxide solution.
The flue gas and soluble alkali liquor are contacted in a spray tower for mass transfer, and the ozone is also introduced into the spray tower.
The spray tower is a cylinder with the diameter of 0.8m, the height of the tower is 5m, the wall thickness is 8mm, and the spray tower is made of 304L stainless steel. The sprayer 1 is arranged in the tower at a position 2 meters away from the top, and the sprayer 1 consists of 3 90-degree conical solid nozzles 2 which are uniformly arranged in a cross section. A mixer 5 is arranged above the sprayer 1, and the mixer 5 is a 316 steel spherical shell with the diameter of 200mm and the thickness of 3 mm. The sprayer 1 is connected with the liquid outlet 14 of the mixer 5; a liquid inlet 15 of the mixer 5 is connected with a liquid inlet pipe 4 of soluble alkali liquor; the air inlet 16 of the mixer 5 is connected with the ozone inlet pipe 6. The spray tower is provided with a flue gas inlet 7 at a position 1.5m away from the bottom, and a flue gas outlet 8 is arranged at the top. The bottom of the spray tower is used as a lye tank 9. An ozone inlet pipe 6 is connected with an ozone generator 3 outside the spray tower, and a gas booster pump 10 and a flow regulating valve 11 are also arranged on the pipeline. The tail end of a liquid inlet pipe 4 of the soluble alkali liquor is connected to an alkali liquor tank 9 at the bottom of the spray tower, and a liquid booster pump 12 and a flow regulating valve 13 are also arranged on the pipeline.
The flue gas enters the spray tower through a flue gas inlet 7 and rises in the spray tower; opening a flow regulating valve 13 and a booster pump 12 of a soluble alkali liquor input and circulating system, conveying the alkali liquor in an alkali liquor tank 9 to a mixer 5 through a liquor inlet pipe 4, and regulating the flow of the alkali liquor through the flow regulating valve 13 to ensure that the input amount per hour is not less than 4 kg; the flow regulating valve 11 is opened, the booster pump 10 is started, the ozone generated by the ozone generator 3 is also conveyed to the mixer 5 through the air inlet pipe 6, and the amount of the ozone is regulated through the flow regulating valve 11, so that the input amount of the ozone per hour is not less than 400 g. Ozone and soluble alkali liquor are mixed in the mixer 5, enter the sprayer 1 through the liquid outlet 15 and are sprayed out through the nozzle 2. The liquid-gas mixture meets and reacts with the rising flue gas, which then rises out of the spray tower through the flue gas outlet 8, and the liquid falls into the lye tank 9.
Measured at a flue gas outlet 8 of the spray tower to obtain NO contents of 43, 32, 37 and 41mg/m3An equivalent value in the range of 30-45mg/m3In the meantime.
Example 2
The invention is described with reference to figure 2:
the flue gas is the sintering flue gas of a sintering workshop of a certain steel mill. The initial flue gas parameters are: the temperature of the smoke is 135-137 ℃, the humidity of the smoke is 0.01-0.03 percent, and the NO content is 174-183mg/m3Total nitrogen oxide content 273-296mg/m3Oxygen content is 14-16%, and flue gas flow is 904m3/h。
The ozone generator 3 is OZ type air source ozone generator produced by ozone purification equipment of Qingdao Zhongdao, the ozone production is 500g/h, the ozone concentration is 18-30g/m3. The soluble alkali solution is 0.1M sodium hydroxide solution.
The flue gas and soluble alkali liquor are contacted in a spray tower for mass transfer, and the ozone is also introduced into the spray tower.
The spray tower is a cylinder with the diameter of 0.8m, the height of the tower is 5m, the wall thickness is 8mm, and the spray tower is made of 304L stainless steel. The sprayer 1-b is arranged in the tower at a position 1m away from the top, and the sprayer 1-b consists of 3 90-degree conical solid nozzles 2 which are uniformly arranged in a cross section. A sprayer 1-a is arranged in the tower at a position 2 meters away from the top, and the sprayer 1-a also consists of 3 90-degree conical solid nozzles 2 which are uniformly arranged in a cross section. A mixer 5 is arranged between the sprayer 1-b and the sprayer 1-a, and the mixer 5 is a 316 steel spherical shell with the diameter of 200mm and the thickness of 3 mm. The sprayer 1-a is connected with the liquid outlet 14 of the mixer 5; a liquid inlet 15 of the mixer 5 is connected with a liquid inlet pipe 4-a of soluble alkali liquor; an air inlet 16 of the mixer 5 is connected with an ozone inlet pipe 6; the liquid inlet pipe 4-b of the soluble alkali liquor is directly connected with the sprayer 1-b. The spray tower is provided with a flue gas inlet 7 at a position 1.5m away from the bottom, and a flue gas outlet 8 is arranged at the top. The bottom of the spray tower is used as a lye tank 9. An ozone inlet pipe 6 is connected with an ozone generator 3 outside the spray tower, and a gas booster pump 10 and a flow regulating valve 11 are also arranged on the pipeline. The liquid inlet pipes 4-a and 4-b of the soluble alkali liquor are respectively connected to an alkali liquor tank 9 at the bottom of the spray tower, and liquid booster pumps 12-a and 12-b and flow regulating valves 13-a and 13-b are respectively arranged on the pipelines.
The flue gas enters the spray tower through a flue gas inlet 7 and rises in the spray tower; opening a flow regulating valve 13-a and a booster pump 12-a of a soluble alkali liquor input and circulation system, conveying the alkali liquor in an alkali liquor tank 9 to a mixer 5 through a liquor inlet pipe 4-a, and regulating the flow of the alkali liquor through the flow regulating valve 13-a to ensure that the input quantity per hour is not less than 4 kg; simultaneously opening a flow regulating valve 13-b and a booster pump 12-b, conveying an alkali liquor inlet pipe 4-b in an alkali liquor tank 9 to a sprayer 1-b, and regulating the flow of the alkali liquor through the flow regulating valve 13-b to ensure that the input quantity per hour is not less than 4 kg; the flow regulating valve 11 is opened, the booster pump 10 is started, the ozone generated by the ozone generator 3 is also conveyed to the mixer 5 through the air inlet pipe 6, and the amount of the ozone is regulated through the flow regulating valve 11, so that the input amount of the ozone per hour is not less than 400 g. Ozone and soluble alkali liquor are mixed in the mixer 5, enter the sprayer 1-a through the liquid outlet 15 and are sprayed out through the nozzle 2, and meanwhile, the sprayer 1-b directly sprays out the soluble alkali liquor. The liquid-gas mixture and the soluble alkali liquor meet and react with the rising flue gas, then the flue gas rises and exits the spray tower through the flue gas outlet 8, and the liquid falls into the alkali liquor tank 9.
Measured at a flue gas outlet 8 of the spray tower to obtain the NO contents of 31, 29, 24 and 30mg/m3An equivalent value in the range of 20-35mg/m3In the meantime.
Comparative example
FIG. 3 is a schematic system flow diagram of a comparative example.
The difference compared to the example is that ozone is not added to the spray tower, but is conveyed to the flue 17 before the spray tower. In addition, this comparative example employed a nozzle as the ozone distributor 18, and the distance of the ozone distributor 18 from the flue gas inlet 7 was 5 m.
The spray tower is the same as the embodiment: a cylinder of diameter 0.8m, a column height 5m, a wall thickness 8mm, 304L stainless steel. The sprayer 1 is arranged in the tower at a position 2 meters away from the top, and the sprayer 1 consists of 3 90-degree conical solid nozzles 2 which are uniformly arranged in a cross section. The sprayer 1 is not connected with the mixer, but is directly connected with a liquid inlet pipe 4 of the soluble alkali liquor. The tail end of a liquid inlet pipe 4 of the soluble alkali liquor is connected to an alkali liquor tank 9 at the bottom of the spray tower, and a liquid booster pump 12 and a flow regulating valve 13 are arranged on a pipeline; an ozone distributor 18 arranged in the flue is connected with an ozone inlet pipe 6, the ozone inlet pipe 6 is connected with an ozone generator 3, and a gas booster pump 10 and a flow regulating valve 11 are arranged on the pipeline.
Sintering flue gas is firstly introduced into a flue 17, an ozone distributor 18 is positioned in the flue, a gas booster pump 10 and a flow regulating valve 11 are opened, and ozone is introduced into the flue 17 through the ozone distributor 18. The booster pump 12 and the flow rate adjustment valve 13 are closed. The flue gas and the introduced ozone enter the spray tower through a flue gas inlet 7 and exit the spray tower through a flue gas outlet 8.
(1) When the orientation of the ozone distributor 18 is opposite to the flue gas flow direction, the measured NO concentration value at the flue gas outlet 8 is: 172. 174, 167, 163mg/m3。
(2) When the orientation of the ozone distributor 18 is in line with the flue gas flow direction, the measured NO concentration value at the flue gas outlet 8 is: 171. 168, 170, 163mg/m3。
In both cases the proportion of NO oxidized by the ozone fed in is smaller, less than 10%.
Claims (6)
1. The utility model provides an utilize ozone and spray column to carry out denitration system of flue gas denitration, including the spray column, ozone supply system, soluble alkali lye supply system, set up the spray thrower in the spray column, a serial communication port, denitration system still includes the blender of ozone and soluble alkali lye, ozone intake pipe and soluble alkali lye feed liquor pipe connect the blender respectively, ozone supply system carries the blender with ozone through the intake pipe, soluble alkali lye supply system carries the blender with soluble alkali lye through the feed liquor pipe, the sprayer is connected to the blender, ozone and soluble alkali lye mix the back in the blender, nozzle subtend through the sprayer spouts to the flue gas.
2. The denitration system for denitration of flue gas using ozone and a spray tower according to claim 1, wherein two or more sets of the mixer and the sprayer are provided in the spray tower.
3. The denitration system for denitration of flue gas using ozone and a spray tower as claimed in claim 1, wherein the mixer is a segment of a nozzle.
4. The denitration system for denitration of flue gas by using ozone and a spray tower as claimed in claim 1, wherein one or more additional spray throwers are further provided above the spray throwers, nozzles of the spray throwers are directly connected to a liquid inlet pipe of the soluble alkali solution, and the nozzles only eject the soluble alkali solution.
5. The denitration system for denitration of flue gas by using ozone and a spray tower as claimed in claim 1, wherein the tower shell of the spray tower is a section of flue.
6. The denitration system for denitration of flue gas using ozone and a spray tower as set forth in claim 1, wherein the mixer is disposed in the vicinity of the spray nozzle.
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