CN212348295U

CN212348295U - System for utilize chlorine dioxide and whirl dish tower to carry out flue gas denitration

Info

Publication number: CN212348295U
Application number: CN202020293711.3U
Authority: CN
Inventors: 刘明; 张菡英; 赵莉; 钤小平
Original assignee: Shandong Normal University
Current assignee: Shandong Normal University
Priority date: 2020-03-11
Filing date: 2020-03-11
Publication date: 2021-01-15
Anticipated expiration: 2030-03-11

Abstract

The invention provides a system for denitration of flue gas by utilizing chlorine dioxide and a cyclone disc tower, which comprises the cyclone disc tower, a chlorine dioxide supply system and a soluble alkali liquor supply system, wherein the cyclone disc tower is internally provided with the cyclone disc and a chlorine dioxide distributor, the soluble alkali liquor supply system conveys the soluble alkali liquor to the cyclone disc, the chlorine dioxide supply system conveys the chlorine dioxide to the chlorine dioxide distributor, the flue gas firstly enters the tower from a flue gas inlet of the cyclone disc tower, and meets the alkali liquor on the cyclone disc after being oxidized to form a gas-liquid cyclone layer, and mass transfer is completed in the gas-liquid cyclone layer. The invention solves the problem of low denitration efficiency in the prior oxidation technology, and has unexpected technical effect by combining the cyclone disc tower with chlorine dioxide for denitration.

Description

System for utilize chlorine dioxide and whirl dish tower to carry out flue gas denitration

Technical Field

The invention relates to the field of flue gas denitration, in particular to a system for flue gas denitration by using chlorine dioxide and a cyclone disc 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. In general flue gas, NO usually accounts for about 90% of the total amount of nitrogen oxides, but NO is difficult to dissolve in water, so that the NO is difficult to remove by water washing or alkali liquor neutralization, which is also the difficulty of the current flue gas denitration. 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. ClO2 is a green oxidant with strong oxidizability and low cost, so that the application of ClO2 in an oxidation absorption method for denitration is a better choice. Publication No. CN109718653A entitled "a flue gas desulfurization and denitration apparatus and method" discloses a technology for denitration by using chlorine dioxide, and also discloses patents such as publication nos. CN110624385A, CN106975337A, CN105771577A, and CN105169913A, and also discloses technologies for denitration by using chlorine dioxide, respectively. In the mentioned patent technology, the technical idea of denitration adopts the technical route of "oxidizing NO in flue gas by chlorine dioxide into high-valence nitrogen oxide which is easy to react with alkali liquor, and then washing and absorbing by alkaline solution". However, in actual production, the denitration effect of the technical route is not very good. Analyzing the reason, the technical route has an oxidation space and an absorption space in the process, but the existing process does not pay attention to the connection between the two spaces, so that the removal effect of nitrogen oxides in the flue gas is poor.

Disclosure of Invention

Different from the prior art route, the invention provides a system for denitration of flue gas by using chlorine dioxide and a cyclone disc tower, and the system can solve the technical problems of poor denitration effect and high cost of the chlorine dioxide in the prior art. The content is as follows:

1. a system for denitration of flue gas by using chlorine dioxide and a cyclone disc tower comprises the cyclone disc tower, a chlorine dioxide supply system and a soluble alkali liquor supply system, and is characterized in that the cyclone disc tower is internally provided with the cyclone disc and a chlorine dioxide distributor, the chlorine dioxide distributor is positioned at the lower part of the cyclone disc, the upper part of a flue gas inlet is provided with the soluble alkali liquor supply system, the soluble alkali liquor supply system conveys the soluble alkali liquor to the cyclone disc from the upper part of the cyclone disc through a liquid inlet pipe, the chlorine dioxide supply system conveys the chlorine dioxide to the chlorine dioxide distributor through a chlorine inlet pipe, the chlorine dioxide distributor sprays chlorine dioxide downwards, the flue gas firstly enters the tower from the flue gas inlet of the cyclone disc tower and meets the chlorine dioxide sprayed by the chlorine dioxide distributor in the rising process, NO in the flue gas reacts with the chlorine dioxide to form high-valence nitrogen oxides, the high-valence nitrogen, the liquid passes through the spiral-flow disk from the gap of spiral-flow disk, meets with alkali lye on the spiral-flow disk and forms gas-liquid whirl layer, and soluble alkali lye absorbs the nitrogen oxide of high valence state in the flue gas in gas-liquid whirl layer, then gas-liquid separation, and gas continues to rise and goes out the spiral-flow disk tower from the exhanst gas outlet, and meanwhile, partial liquid in the gas-liquid whirl layer flows down from the peripheral broad gap of spiral-flow disk to collect in the lye tank of spiral-flow disk bottom.

Preferably, the center of the spinning disk is a solid disk.

Preferably wherein the chlorine dioxide distributor is a gas distributor.

Preferably wherein the chlorine dioxide distributor is a liquid atomizer.

Preferably, wherein the distance between the chlorine dioxide distributor and the cyclone disk is less than 0.5 m.

Preferably, the distance between the chlorine dioxide distributor and the cyclone disk is less than 0.2 m.

The content of the invention is specifically described as follows:

theoretical basis of the invention

1. The existing oxidation denitration technology has the poor denitration effect because:

(1) the applicant believes that in the gaseous state, NO is in the direction of NO₂There is an equilibrium relationship upon transformation:

2NO₂ ↔ O₂ + 2NO ①

at higher temperatures, lower pressures and lower concentrations of NO, NO is not readily converted to NO₂Or NO after conversion₂And immediately converted to NO. Thus, even if NO in the flue gas can be oxidized by an oxidant such as chlorine dioxide, since the concentration of NO in the flue gas is low, the formula (i) proceeds to the right, and a large proportion of NO finally exists even if NO in the flue gas is oxidized.

2ClO₂+4NO →4NO₂+Cl ₂②

2NO₂→ O₂ + 2NO ③

According to the equilibrium relation (formula I), if the concentration of NO in the flue gas is low (the actual NO in the flue gas generally does not exceed 300 mg/m)₃) Even if NO is oxidized to higher valence NO₂(formula II), but NO according to the formula III₂And back to NO, a large proportion of NO will also be present in the final flue gas. This is also the reason why the denitration effect of the oxidant (including chlorine dioxide) is not high in the existing oxidation denitration technology. Of course, the prior art can improve the denitration effect by increasing the input amount of the oxidant, which inevitably increases the cost greatly.

(2) In the prior art, the NO oxidation process in the flue gas and the oxidized high-valence nitrogen oxide absorption process are separated and independent, so that the distance between the oxidation space and the absorption space is large, even if NO in the flue gas is oxidized in the oxidation link, due to the analysis reason, the oxidation product NO2 is converted into NO in the process from the oxidation process to the absorption process of the flue gas. Therefore, in the absorption process, the absorption liquid can not completely remove the nitrogen oxides in the flue gas, so that the denitration effect is poor. The reaction in the absorption process is:

3NO₂ +2 OH^-→ NO₃ ^-+ NO + H₂ O ④

NO₂ + NO + 2OH^-→ 2NO₂ ^-+ H₂ O ⑤

2. the difference between the present invention and the prior art lies in:

compared with the prior art, the invention puts the oxidation process and the absorption of the flue gas into a tower and a space. In a preferable scheme, the oxidation position is required to be close to the absorption position, such as less than 0.5 meter, even less than 0.2 meter, so that NO in the flue gas can immediately enter the absorption link after being oxidized, the time and space for converting NO2 into NO are reduced, and the denitration effect of the flue gas can be improved.

Preparation of (di) chlorine dioxide

The preparation of chlorine dioxide is a matter of prior art. As disclosed in patent publication No. CN 209362207U: the chlorine dioxide generator for sterilizing drinking water and sewage is mainly a chlorine dioxide preparation device using sodium chlorate and hydrochloric acid as raw materials, when the equipment is operated, the sodium chlorate solution and hydrochloric acid solution are fed into the chlorine dioxide generator according to a certain proportion, and chemical reaction is produced in the equipment to produce reaction products of chlorine dioxide, chlorine, sodium chloride and water, etc. The raw materials for producing chlorine dioxide are sodium chlorate and hydrochloric acid; publication No. CN110624385A also discloses a production method of chlorine dioxide denitration: a low-temperature denitration method for a sodium chlorite solution is characterized in that a 25% sodium chlorite aqueous solution is adopted as an oxidant, an acid solution is adopted as an activator, the acid solution is continuously added into the sodium chlorite solution when the denitration device is used, the sodium chlorite is conveyed to a flue gas inlet pipe through a conveying pump, the oxidant is sprayed into flue gas through an atomizing spray gun, chlorine dioxide is generated by the sodium chlorite through reaction with the acid solution, the nitrogen monoxide is oxidized into nitrogen dioxide by the chlorine dioxide generated after the heat of the flue gas is evaporated, and the oxidized nitrogen dioxide is absorbed by sodium hydroxide sprayed by an alkaline tower. The raw materials are sodium chlorite and acid; publication No. CN105771577A discloses an improved process for the preparation of chlorine dioxide: the method for preparing chlorine dioxide and using the chlorine dioxide in the flue gas denitration device is carried out according to the following steps:

(1) taking a sodium chlorate solution with the mass concentration of 15-18% and industrial hydrochloric acid with the mass concentration of 31% as raw materials, preheating the raw materials to 55-70 ℃, and then adopting a metering pump to mix the raw materials according to the volume ratio of the industrial hydrochloric acid: the sodium chlorate solution =1 (1-1.2) is prepared by respectively feeding the sodium chlorate solution and industrial hydrochloric acid into two V-shaped pipes with an included angle of 55-65 degrees of a three-way pipeline, and carrying out mixing reaction in a third pipeline; (2) the method comprises the steps of obtaining a mixture containing strong oxidant ClO2 after mixing reaction in a pipeline, uniformly distributing the mixture through a distribution spraying device at the outlet end of the pipeline, dispersing the gas-liquid mixture into fine mist, directly extending a spray head of the distribution spraying device into a flue gas pipeline, uniformly mixing the mixture with flue gas, carrying out redox reaction on low-valence Nitrogen Oxides (NO) in the flue gas and ClO2, oxidizing the low-valence Nitrogen Oxides (NO) into high-valence nitrogen oxides (NO 2), and absorbing the oxidized product by alkali liquor. Sodium chlorate and hydrochloric acid are also used as raw materials.

Large scale production of chlorine dioxide (both gas and liquid) is generally carried out by electrolysis of a brine solution under specific conditions to obtain sodium chlorate, which is then reacted with hydrochloric acid.

The chlorine dioxide can be chlorine dioxide aqueous solution, chlorine dioxide gas, or a mixture of the chlorine dioxide aqueous solution and the chlorine dioxide gas, and chlorine dioxide-containing liquid and chlorine dioxide-containing gas. Patent CN110624385A discloses a method for low-temperature denitration of sodium chlorite solution, in which an oxidant is 25% sodium chlorite aqueous solution, an acid solution is used as an activator, the acid solution is continuously added into the sodium chlorite solution when in use, the sodium chlorite solution is delivered into a flue gas inlet pipe through a delivery pump, and the oxidant is sprayed into the flue gas through an atomizing spray gun; CN105169913A also uses chlorine dioxide in liquid phase, which discloses: the oxidizing circulation pump 18 draws the oxidizing agent solution of ClO2 from the oxidizing agent circulation tank 17, and sends the oxidizing agent solution to the spray pipe 20 through the oxidizing agent delivery pipe 19, and the waste liquid collected by the liquid collector 21 after the oxidizing absorption of NO flows back to the oxidizing agent circulation tank 17 through the oxidizing agent return pipe 22 for recycling. CN105771577A uses chlorine dioxide in a mixture of liquid and gas phases. Patent CN106237814A discloses an apparatus and process for gas phase chlorine dioxide oxidation of NO in flue gas.

In summary, the technical means of preparing chlorine dioxide in the prior art can be applied to the present invention as a technical feature of the present invention.

Chlorine dioxide generators are available directly on the market for use in the production of chlorine dioxide according to the invention.

(III) chlorine dioxide supply System

The chlorine dioxide supply system comprises a chlorine dioxide generator, a booster pump, a valve, a chlorine inlet pipe, a chlorine dioxide distributor and the like. The function is to supply chlorine dioxide to the cyclone disc tower and distribute the chlorine dioxide to the flue gas.

The chlorine dioxide distributor is a device for uniformly distributing chlorine dioxide generated by a chlorine dioxide generator in smoke flowing through a cyclone disc tower. When chlorine dioxide is supplied in the system as a liquid or a mixture of gas and liquid, various liquid spray heads, liquid atomizers, and dedicated liquid distributors disclosed in the foregoing patents, etc. may be used. In a preferred embodiment of the invention, an atomization device is used. The aim is that the atomization device can obtain the chlorine dioxide liquid drops with smaller size, so that the chlorine dioxide liquid drops are contacted and mixed with the flue gas more fully. And moreover, the liquid drops are small, the weight is light, and the liquid drops can be utilized to a greater extent so as to prevent a large amount of liquid drops from entering an alkali liquor tank at the bottom of the cyclone disk tower and further causing the loss of the chlorine dioxide.

When chlorine dioxide is supplied as a gas, gas distributors, gas nozzles, etc. as disclosed in the prior art may be used, and a preferred form of the invention employs a spiral coil with small holes.

The amount of chlorine dioxide used in the process is determined according to the amount of NO in the flue gas. According to the formula (II), 1 mol of chlorine dioxide can oxidize 2 mol of NO, so that theoretically, the ratio of the input amount of chlorine dioxide in unit time to the amount of NO in unit time of the smoke is 1: 2. according to the formula, soluble alkali liquor can play a role in assisting oxidation, the input amount of chlorine dioxide can be smaller, but in order to remove nitrogen oxide in flue gas in a larger amount, the ratio of the input amount of pure chlorine dioxide in unit time to the amount of NO in unit time of flue gas is 1: 1 or greater than 1: 1.

(IV) soluble alkali liquor and 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 soluble alkali liquor spraying environment refers to an environment formed by spraying soluble alkali liquor through a sprayer and being coated by spraying liquor. In the environment, the flue gas can contact the soluble alkali liquor instantly and at any time.

The soluble alkali liquor supply system comprises an alkali liquor tank, a pressure pump, a valve, an alkali liquor inlet pipe and the like. The function is to convey the soluble alkali liquor to the upper part of the cyclone disk. The sprayed alkali liquor has a larger pH value, so that the alkali liquor can be recycled, and the alkali liquor flowing down from the gap of the spiral flow disk is collected to the alkali liquor tank and then is conveyed to the nozzle by the pressure pump for re-absorption. If the pH is lowered, a soluble base may be added for adjustment. The absorption product may be periodically withdrawn from the lye tank.

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.

In practical application, the unit input amount of the soluble alkali can be 10-100 times of the amount of the corresponding nitrogen oxide, and the height requirement of a gas-liquid rotational flow layer formed on the rotational flow disk during working is taken as a standard.

(V) cyclone tray tower and cyclone tray

The cyclone disc tower is a place for realizing the technical idea in the denitration system. The cyclone disc tower mainly comprises a cyclone disc and a tower shell, wherein the cyclone disc is arranged in the tower shell and is positioned above the flue gas inlet. The whirl dish can adopt to be applied to among the prior art to the whirl dish of gaseous whirl, and its concrete structure is: a circular tower tray is composed of several cyclone blades uniformly arranged in radial shape from center to periphery of tray, and the blades are made of thin plate and have an angle with tower axis, and the gap between two blades is a flue gas channel, and the gap is correspondent to the blade and also has an inclination angle with tower axis. The cavity of the slit gradually increases from the center to the periphery. In order to be convenient to manufacture and install, the periphery of the blade is a circular ring, and the periphery of the blade is welded on the circular ring. Or the blades can be sequentially and directly welded on the inner wall of the tower shell at a certain position of the inner wall of the tower shell to form a spiral-flow disk.

In a preferred scheme, the central point of whirl dish puts and sets solid construction into, and the purpose is in better accepting liquid to make both better homogeneous mixing, also can not lead to liquid too early through the gap between the blade, influence flue gas denitration effect.

FIG. 3, FIG. 4 and FIG. 5 also show the structure of a spinning disk

In the prior art, the cyclone disc is usually applied to gas cyclone, but in the invention, the cyclone disc tower is used for flue gas denitration, which can achieve unexpected technical effects. The reason is that the cyclone disk not only has the effect of gas cyclone, but also can swirl the liquid at the upper part, and can better stir and mix the gas and the liquid, thereby enhancing the gas-liquid contact, reaction and mass transfer effects.

The invention has the beneficial effects that:

1. the problem of low denitration efficiency in the prior oxidation technology is solved, and the cost is saved;

2. the rotational flow tray tower is combined with chlorine dioxide for denitration, so that the method has great economic and social benefits.

Drawings

FIG. 1: a schematic of the denitrification system of example 1.

FIG. 2: a denitration system schematic of example 2.

FIG. 3: schematic illustration of a spinning disk in an embodiment.

FIG. 4: fig. 3 is a cross-sectional view.

FIG. 5: schematic illustration of a blade in an embodiment.

FIG. 6: the left side view of fig. 5.

FIG. 7: the connection relationship of the blades and the solid disc is shown in the drawing (A).

FIG. 8: and (B) a schematic diagram of the connection position relation of the blades and the outer ring.

FIG. 9: schematic diagram of a chlorine dioxide distributor as in example 1.

Detailed Description

Example 1

The present invention will be described with reference to fig. 1, 3 to 9:

the cyclone disk tower is a cylinder with the diameter of 0.8m, the height of the tower is 5m, the wall thickness is 8mm, and the tower is made of 304L stainless steel. The cyclone disk 1 is arranged at a position 3.5 meters away from the bottom of the tower shell. The diameter of the outer ring 2 of the cyclone disk 1 is 790mm, and the cyclone disk is connected with the tower shell by spot welding. The center of the cyclone disk 1 is a solid disk 3 with a diameter of 150 mm. The thickness of the blades 4 is 6mm, the total number of the blades is 36, the blades are uniformly arranged between the solid disc 3 and the outer ring 2, and the included angle between the blades 4 and the horizontal direction is 36 degrees.

The flue gas inlet 5 is opened at a position 1M away from the bottom of the cyclone disk tower, the flue gas outlet 6 is opened at the top of the tower shell, the bottom space of the cyclone disk tower is used as an alkali liquor tank 7, and the molar concentration of the soluble alkali liquor solution put in before the tower starts to operate is 1M. Chlorine dioxide's chlorine inlet pipe 8 is connected with chlorine dioxide generator 9 outside the tower, still is provided with gas booster pump 10 and flow control valve 11 on the pipeline, and chlorine inlet pipe 8 is connected with chlorine dioxide distributor 12 in the tower, and chlorine dioxide distributor 12 is located 0.2m department below the whirl dish 1, and chlorine dioxide distributor 12 is a plane heliciform coil pipe, and the coil pipe deviates from whirl dish 1, evenly opens a plurality of 1 mm's aperture to the one side that the flue gas came to. The pipeline of the liquid inlet pipe 13 of the soluble alkali liquor is also provided with a liquid booster pump 14 and a flow regulating valve 15. The liquid outlet of the liquid inlet pipe 13 is arranged at the position above the solid disc 3, and the other end of the liquid inlet pipe 13 is connected to the lye tank 7 at the bottom of the cyclone disc.

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 flue gas is 135-137 ℃, the humidity of the flue gas is 0.01-0.03%, and the NO content is 174-183mg/m³The flue gas flow is 904m³/h。

The chlorine dioxide generator 9 is QKJ-2000 model chlorine dioxide generator of Jinan Qili environmental protection science and technology Limited, when in use, the generator is modified (the water injector is disconnected) to only output gases such as chlorine dioxide, the raw materials are sodium chlorite and hydrochloric acid, and the unit chlorine dioxide yield is 2000 g/h.

The flue gas enters the cyclone disc tower through a flue gas inlet 5 and rises in the tower; opening a flow regulating valve 11 of a chlorine dioxide pipeline, starting a booster pump 10, conveying chlorine dioxide gas generated in a chlorine dioxide generator 9 to a chlorine dioxide distributor 12 through a chlorine inlet pipe 8, spraying the chlorine dioxide gas through small holes, enabling the sprayed chlorine dioxide gas to meet with flue gas and oxidize NO in the flue gas, and regulating the flow of the chlorine dioxide through the regulating valve 11 to enable the input amount of pure chlorine dioxide per hour to be not less than 400 g; the oxidation products continuously rise to the cyclone disk 1 along with the flue gas and pass through the gaps of the blades 4 of the cyclone disk; meanwhile, an adjusting valve 15 and a booster pump 14 of the soluble alkali liquor input and circulating system are opened, alkali liquor in an alkali liquor tank 7 is conveyed to the solid disc 3 of the cyclone disc 1 through a liquor inlet pipe 12 and is diffused around along the surface of the cyclone disc, an air-liquid cyclone layer 16 is formed under the effect of the lift force of the smoke gas in the gaps of the blades 4, and the soluble alkali liquor absorbs oxidation products in the air-liquid cyclone layer 16; and finally, gas-liquid separation is carried out, the flue gas flows out from the flue gas outlet 6, the gap of the blade 4 close to the wall of the tower shell is enlarged due to the clearance, and partial liquid at the position flows downwards under the action of gravity and finally is collected into a lye tank 7 at the bottom of the tower.

Measured at a flue gas outlet 6 of the cyclone disc tower, the measured values are 37, 48, 51, 39 and the like, and the NO content is 35-55mg/m³。

Example 2

The invention will be described with reference to the accompanying figures 2 to 8:

The flue gas inlet 5 is opened at a position 1M away from the bottom of the cyclone disk tower, the flue gas outlet 6 is opened at the top of the tower shell, the bottom space of the cyclone disk tower is used as an alkali liquor tank 7, and the molar concentration of the soluble alkali liquor solution put in before the tower starts to operate is 1M. The chlorine dioxide inlet pipe 8 is connected with a chlorine dioxide generator 9 outside the tower, a gas booster pump 10 and a flow regulating valve 11 are also arranged on the pipeline, the chlorine dioxide distributor 12 is connected with the chlorine dioxide distributor 12 inside the tower, the chlorine dioxide distributor 12 is positioned at a position 0.2m below the cyclone disk 1, the chlorine dioxide distributor 12 is an atomizing nozzle, and the direction of the nozzle is downward. The pipeline of the liquid inlet pipe 13 of the soluble alkali liquor is also provided with a liquid booster pump 14 and a flow regulating valve 15. The liquid outlet of the liquid inlet pipe 13 is arranged at the position above the solid disc 3, and the other end of the liquid inlet pipe 13 is connected to the lye tank 7 at the bottom of the cyclone disc.

The chlorine dioxide generator 9 is QKJ-2000 type chlorine dioxide generator of Jinan Qili environmental protection science and technology Limited, the raw materials are sodium chlorite and hydrochloric acid, the output is a gas-liquid mixture, and the unit yield of chlorine dioxide is 2000 g/h.

The flue gas enters the cyclone disc tower through a flue gas inlet 5 and rises in the tower; opening a flow regulating valve 11 of a chlorine dioxide pipeline, starting a booster pump 10, conveying chlorine dioxide gas generated in a chlorine dioxide generator 9 to a chlorine dioxide distributor 12 through a chlorine inlet pipe 8, spraying the chlorine dioxide gas through an atomizing nozzle, enabling atomized chlorine dioxide-containing liquid to meet with flue gas and oxidize NO in the flue gas, and regulating the flow of chlorine dioxide through the regulating valve 11 to enable the input amount of pure chlorine dioxide per hour to be not less than 400 g; the oxidation products continuously rise to the cyclone disk 1 along with the flue gas and pass through the gaps of the blades 4 of the cyclone disk; meanwhile, an adjusting valve 15 and a booster pump 14 of the soluble alkali liquor input and circulating system are opened, alkali liquor in an alkali liquor tank 7 is conveyed to the solid disc 3 of the cyclone disc 1 through a liquor inlet pipe 12 and is diffused around along the surface of the cyclone disc, an air-liquid cyclone layer 16 is formed under the effect of the lift force of the smoke gas in the gaps of the blades 4, and the soluble alkali liquor absorbs oxidation products in the air-liquid cyclone layer 16; and finally, gas-liquid separation is carried out, the flue gas flows out from the flue gas outlet 6, the gap of the blade 4 close to the wall of the tower shell is enlarged due to the clearance, and partial liquid at the position flows downwards under the action of gravity and finally is collected into a lye tank 7 at the bottom of the tower.

Measured at the flue gas outlet 6 of the cyclone disc tower, the measured values are 42, 46, 55, 57 and the like, and the NO content is 40-60mg/m³。

Claims

1. The utility model provides an utilize chlorine dioxide and whirl dish tower to carry out system of flue gas denitration, including whirl dish tower, chlorine dioxide feed system, soluble alkali lye feed system, a serial communication port, be provided with whirl dish and chlorine dioxide distributor in the whirl dish tower, chlorine dioxide distributor is located the lower part of whirl dish, the top of flue gas import, soluble alkali lye feed system passes through the top of feed liquor pipe intercommunication whirl dish, chlorine dioxide feed system passes through chlorine inlet pipe intercommunication chlorine dioxide distributor, chlorine dioxide distributor sets up the spout below, whirl dish tower bottom sets up the lye groove.

2. The system for flue gas denitration using chlorine dioxide and a cyclone disk tower of claim 1, wherein the center of the cyclone disk is a solid disk.

3. The system for flue gas denitration using chlorine dioxide and a rotating disk tower of claim 1, wherein the chlorine dioxide distributor is a gas distributor.

4. The system for flue gas denitration using chlorine dioxide and a rotating disk tower of claim 1, wherein the chlorine dioxide distributor is a liquid atomizer.

5. The system for flue gas denitration using chlorine dioxide and a cyclone disk tower of claim 1, wherein the distance between the chlorine dioxide distributor and the cyclone disk is less than 0.5 m.

6. The system for flue gas denitration using chlorine dioxide and a cyclone disk tower of claim 1, wherein the distance between the chlorine dioxide distributor and the cyclone disk is less than 0.2 m.