Boiler flue gas purification device

Abstract

The invention discloses a boiler flue gas purification device which comprises an air duct and a primary oxidation device, the primary oxidation device is connected with the air duct, a fan is arranged on the air duct and leads unpurified boiler flue gas into the air duct and oxidizes the unpurified boiler flue gas through the primary oxidation device, and the boiler flue gas purification device further comprises a reaction cavity of a hollow structure. The air duct is inserted into the reaction cavity and is connected with the plurality of dispersion pipes, a plurality of diffusion holes are formed in the dispersion pipes, a reducing agent solution is filled in the reaction cavity, the dispersion pipes extend from top to bottom, and the diffusion holes are immersed in the reducing agent solution in the reaction cavity; boiler flue gas oxidized by the primary oxidation device enters the dispersion pipes through the air duct and then is released into the reducing agent solution in the reaction cavity through the diffusion holes in the dispersion pipes. The purification device is good in boiler flue gas purification effect, low in installation cost and convenient to maintain in the later period.

Description

Technical Field

[0001] The invention relates to the technical field of boiler combustion flue gas purification, in particular to a boiler flue gas purification device. Background Art

[0002] The nitrogen oxides produced during the combustion of boiler fuel are mainly NO and NO2, which are usually referred to as nitrogen oxides NOx. NOx can irritate the lungs, making it more difficult for people to resist respiratory diseases such as colds. People with respiratory problems, such as asthma patients, are more susceptible to nitrogen dioxide. For children, nitrogen oxides may cause damage to lung development, and there are also a lot of particulate matter and dust in the boiler flue gas, which also affects the atmospheric environment and people's health. Especially in autumn and winter, the problem of flue gas emissions from heating boilers is becoming more and more serious. When the boiler is burning, the nitrogen dioxide content in the high-temperature exhaust gas directly generated is low, and the nitrogen monoxide content is high. The conversion process of nitrogen monoxide to nitrogen dinitrogen in the atmosphere is slow. It takes a long time for the nitrogen monoxide emitted into the air to finally be converted into nitrogen dioxide. Therefore, even if the monitoring emission results meet the standards, after a period of conversion, the flue gas emitted by the boiler will still pollute the living environment of the surrounding residents. The flue gas composition after combustion of industrial boilers on the market is complex and needs to be processed by special processing technology and processing equipment before it can be discharged into the atmosphere. This processing technology is complex and the processing equipment is expensive, so it cannot be directly applied to the treatment of boiler flue gas. However, most of the flue gas from the boilers on the market is directly discharged into the atmosphere after burning the fuel, which has a profound impact on the atmosphere. There are few reports on boiler flue gas treatment devices in the market. The emission of nitrogen oxides can be reduced to a certain extent by modifying the internal structure of the boiler and improving the quality of the fuel, but the effect cannot be guaranteed because there are many influencing factors, such as weather changes, fuel combustion conditions, etc., which directly affect the emission of nitrogen oxides. And even if the flue gas emission test results meet the standards, a large amount of nitrogen oxides can still be detected in the surrounding environment. It is visually observed that there is still a lot of smoke continuously discharged into the atmosphere, which has a bad impact on the atmosphere.

[0003] In addition, particulate matter and dust emissions also have a profound impact on the atmosphere. The droplets produced by water atomization can significantly intercept particulate matter and play a role in flue gas purification, but the dust purification and interception effect is weak. According to aerodynamic theory, when the dust-laden airflow bypasses the droplets, the dust particles will deviate from the circling gas due to inertia and collide with the droplets and be captured. The probability of being captured is related to the droplet diameter. When the droplet diameter is similar to the dust particle diameter, the droplets are more likely to capture dust. Studies have shown that the dust capture effect is best when the ratio of the droplet diameter to the dust particle diameter is within the range of 1.25-5. However, since the water mist particles produced by nozzles, fog cannons, etc. are mostly 100-200 microns in diameter, they can only capture PM20 or even larger particles. The capture and dust reduction effect is not ideal for PM2.5-PM10 particles that can be inhaled by the human body. When ultrasonic waves propagate in liquids, under the combined effects of mechanical effects, thermal effects and acoustic cavitation effects, a large number of pores will appear inside the liquid, and at the same time, the intermolecular forces will be destroyed, causing the liquid to disperse and achieve water atomization. Ultrasonic atomization of water can produce 0.5-20 micron water mist, which is much better than nozzles and fog cannons in capturing and reducing dust for PM2.5-PM10 particles that can be inhaled into the human body. Part of the fine mist droplets below 20 microns will evaporate rapidly in the air, making the relative humidity of the air in the locally enclosed dust-catching space quickly saturated. The saturated water vapor condenses with dust particles as nuclei to form "rain" and falls down, which is particularly effective in suppressing submicron ultra-fine dust. Summary of the invention

[0004] The present invention aims to provide a boiler flue gas purification device, which has good boiler flue gas purification effect, low installation cost and convenient later maintenance.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A boiler flue gas purification device comprises an air duct and a primary oxidation device, wherein the primary oxidation device is connected to the air duct, and a fan is arranged on the air duct, the fan leads unpurified boiler flue gas into the air duct and oxidizes the unpurified boiler flue gas through the primary oxidation device, and also comprises a reaction chamber with a hollow structure, wherein the air duct is inserted into the reaction chamber and is connected to a plurality of dispersion pipes, a plurality of emission holes are opened on the dispersion pipes, a reducing agent solution is filled in the reaction chamber, the dispersion pipes extend from top to bottom and the emission holes are immersed in the reducing agent solution in the reaction chamber, and the boiler flue gas oxidized by the primary oxidation device enters each dispersion pipe through the air duct and is then released into the reducing agent solution in the reaction chamber through the emission holes on each dispersion pipe.

[0007] Preferably, a secondary purification device is also included, which includes a plurality of ultrasonic atomizers, and the ultrasonic atomizer includes an atomizing sheet. The reducing agent solution can be immersed in the atomizing sheet. The atomizing sheet vibrates to atomize the reducing agent solution to gather on the liquid surface and above the liquid surface of the reducing agent solution. The distance between the top surface of the atomizing sheet and the liquid surface of the reducing agent solution is 1cm-6cm.

[0008] Preferably, the diffusion holes on the dispersion pipe are provided with a plurality of upper and lower layers, and the diffusion holes are evenly distributed around the dispersion pipe.

[0009] Preferably, the emission holes on the dispersion pipe are spirally distributed around the dispersion pipe from top to bottom, the annular array of dispersion pipes is arranged at the end of the air duct and the end of the dispersion pipe is blocked.

[0010] Preferably, the primary oxidation device is an ozone generator, and the ozone sprayed by the ozone generator can be sprayed into the air duct.

[0011] Preferably, an openable and closable drain valve is provided at the lower part of the reaction chamber, a defogger is provided above the liquid level of the reducing agent solution, a rain cover is provided above the reaction chamber, the rain cover is provided on the reaction chamber and a gap is left between the rain cover and the reaction chamber, a particulate matter sensor and / or a nitrogen oxide sensor is provided on the rain cover or the reaction chamber, the fan is a brushless DC fan, a plurality of air inlet holes are evenly opened in an annular direction on the air duct, and ozone sprayed from the ozone generator is sprayed into the air duct through the air inlet holes; or an air inlet pipe connected to the ozone generator is provided in the air duct, a plurality of air inlet holes are opened on the air inlet pipe, and ozone sprayed from the ozone generator is sprayed into the air duct through the air inlet holes.

[0012] Preferably, the ultrasonic atomizer is fixedly connected to the reaction chamber or the ultrasonic atomizer is floatingly arranged in the reaction chamber, and the distance between the top surface of the atomizer sheet and the liquid surface of the reducing agent solution is 2cm-5cm; when the ultrasonic atomizer is floatingly arranged in the reaction chamber, a hollow floating adjustment chamber is provided in the reaction chamber, and the floating adjustment chamber is floated or suspended in the reducing agent solution in the reaction chamber. The ultrasonic atomizer is carried on the floating adjustment chamber, and the floating adjustment chamber is filled with liquid or foam or solid filler. The distance between the top surface of the atomizer sheet and the liquid surface of the reducing agent solution is adjusted by adjusting the liquid content or foam content or solid filler in the floating adjustment chamber.

[0013] Preferably, a water injection port or a filling port is provided on the floating adjustment chamber, and each ultrasonic atomizer is mounted on at least two floating adjustment chambers; the distance between the top surface of the atomizing sheet and the liquid surface of the reducing agent solution is 3cm-4.5cm; a recess is provided on the floating adjustment chamber, and the ultrasonic atomizer is mounted in the recess of the floating adjustment chamber, and the cross-section of the floating adjustment chamber is basically rectangular, semicircular, semi-elliptical or fan-shaped.

[0014] Preferably, the reaction chamber is connected to the pump body, the filter, and the water tank through a pipeline, the water tank is connected to a water source, and an automatic dosing device is also provided on the water tank. The automatic dosing device adds the reducing agent into the water in the water tank, and the pump body pumps the water with the reducing agent in the water tank to the reaction chamber; the drain valve is connected to the water tank; and a liquid level sensor is provided in the reaction chamber.

[0015] Further preferably, the bottom of the reaction chamber is funnel-shaped, and a drain valve that can be opened and closed is provided at the bottom of the reaction chamber.

[0016] In the above technical solution, the fan leads the unpurified boiler flue gas into the air duct and uses the primary oxidation device to oxidize the unpurified boiler flue gas so that the nitrogen monoxide pollutants are quickly oxidized into nitrogen dioxide. Then, the particulate pollutants and nitrogen dioxide in the boiler flue gas are evenly dispersed to each dispersion pipe along the air duct. The dispersion pipe extends from top to bottom and the emission hole is immersed in the reducing agent solution in the reaction chamber to ensure that the particulate pollutants and nitrogen dioxide in the boiler flue gas are all sprayed into the reducing agent solution in the reaction chamber through the emission hole, so that the nitrogen dioxide is dissolved by the reducing agent solution, absorbed by the low-temperature chemical reaction, and most of the nitrogen dioxide pollutants are removed while most of the large particle pollutants are intercepted. The atomizing plate vibrates to atomize the reducing agent solution to form a large amount of fine mist below 20 microns and gather on the reducing agent solution surface and above the reducing agent solution surface, so that a small part of the nitrogen dioxide escaping from the reducing agent solution can contact and fully mix with the reducing agent in the fine mist state, and react quickly to quickly reduce the nitrogen dioxide to non-toxic and harmless nitrogen and water, thereby achieving the purpose of nitrogen oxide purification. At the same time, since the reducing agent in the fine mist state gathers on the reducing agent solution surface and above the reducing agent solution surface, the local air relative humidity is quickly saturated, and the saturated water vapor condenses with dust particles as nuclei to achieve dust reduction effect, realizing the purification and dust removal of a small part of PM2.5-PM10 particles that escape from the reducing agent solution. By mounting the ultrasonic atomizer on the floating adjustment cavity, adjusting the liquid content or foam content or solid filler in the floating adjustment cavity, and adjusting the distance between the top surface of the atomizer sheet and the reducing agent solution surface, the atomizer sheet together with the buoyancy of the floating adjustment cavity and its own gravity reach a specific dynamic balance, so that the atomizer sheet can be adaptively adjusted according to the change of the liquid level, and the distance between the top surface of the atomizer sheet and the reducing agent solution surface is always maintained between 3cm-4.5cm, the atomizer sheet is always suspended in the water and continuously and efficiently produces fine mist, and the floating adjustment cavity adjusts the position of the atomizer sheet with a simple structure and low cost. High-efficiency purification of boiler flue gas can be achieved by simply adding water and an appropriate amount of reducing agent to the water tank regularly. The subsequent maintenance operation is simple and low-cost, and the device can be directly used in conjunction with existing boilers, further reducing installation costs.

[0017] The test shows that when the combustion boiler is in normal use, under the same experimental conditions, the nitrogen oxide concentration in the air within 5-10 meters around the exhaust port of the combustion boiler without the device is 1090-1157 micrograms / cubic meter; the nitrogen oxide concentration in the air within 5-10 meters around the combustion boiler with the device installed is 56-68 micrograms / cubic meter, and the nitrogen oxide concentration in the air is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of the boiler flue gas purification device (where the reaction chamber is a cross-sectional view);

[0019] Figure 2 It is a schematic diagram of the cross-sectional main view of the reaction chamber;

[0020] Figure 3 It is a schematic diagram of a top view of the structure in which the end of the air duct is directly connected to each dispersion pipe;

[0021] Figure 4 A schematic diagram of a top view of the structure of each dispersed tube annular array arranged on an annular tube;

[0022] Figure 5 This is a schematic diagram of the top view of the structure in which the atomizer is installed on the first type of floating adjustment chamber;

[0023] Figure 6 This is a schematic diagram of the main structure of the atomizer installed on the first type of floating adjustment chamber;

[0024] Figure 7 This is a schematic diagram of the main structure of the atomizer installed on the second type of floating adjustment chamber;

[0025] Figure 8 This is a schematic diagram of the three-dimensional structure of the second floating adjustment cavity. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings:

[0027] like Figures 1 to 8As shown, the boiler flue gas purification device includes an air duct 1 connected to the exhaust port of the external combustion boiler, a primary oxidation device 2 and a reaction chamber 3 with a hollow structure. The primary oxidation device 2 is preferably an ozone generator, which is connected to the air duct 1 so that the ozone ejected by the ozone generator can be sprayed into the air duct 1. Specifically, a plurality of air inlet holes can be evenly opened in the circumferential direction on the air duct 1 (not shown in the figure), and the ozone ejected by the ozone generator can be evenly sprayed into the air duct through the air inlet holes; or an air inlet pipe connected to the ozone generator is provided in the air duct (not shown in the figure), and a plurality of air inlet holes are opened on the air inlet pipe, and the ozone ejected by the ozone generator can be sprayed into the air duct through the air inlet holes. A fan 4 is provided on the air duct 1, and the fan 4 leads the unpurified boiler flue gas into the air duct 1 and uses the primary oxidation device to oxidize the unpurified boiler flue gas, so that the nitrogen monoxide pollutant is quickly oxidized into nitrogen dioxide. The air duct 1 is inserted into the reaction chamber 3 and connected to a plurality of dispersion tubes 5. A plurality of emitting holes 6 are provided on the dispersion tubes 5. A reducing agent solution is provided in the reaction chamber 3. The dispersion tubes 5 extend from top to bottom and the emitting holes 6 are immersed in the reducing agent solution in the reaction chamber 3. In this way, the boiler flue gas oxidized by the primary oxidation device 2 enters each dispersion tube 5 through the air duct 1 and is then released into the reducing agent solution in the reaction chamber through the emitting holes 6 on each dispersion tube, that is, the particulate pollutants and nitrogen dioxide in the boiler flue gas are evenly dispersed to each dispersion tube 5 along the air duct 1 and all are sprayed into the reducing agent solution in the reaction chamber 3 through the emitting holes 6, so that the nitrogen dioxide is dissolved in the reducing agent solution and absorbed by the low-temperature chemical reaction to remove most of the nitrogen dioxide pollutants while intercepting most of the large particle pollutants. The emitting holes 6 on the dispersion tube are provided with several layers up and down, and the emitting holes are evenly distributed around the dispersion tube, so that the particulate pollutants and nitrogen dioxide can be evenly released into the reducing agent solution in the reaction chamber, ensuring that the nitrogen dioxide can be dissolved and reacted with the reducing agent solution to a greater extent and more quickly. Furthermore, the emission holes 6 on the dispersion pipe are spirally distributed from top to bottom in the circumference of the dispersion pipe, such as Figure 1 , 2 As shown, the dispersion tube annular array is arranged at the end of the air duct and the end of the dispersion tube is blocked, so that the nitrogen dioxide and the reducing agent solution dissolve and the low-temperature chemical reaction is more uniform and rapid. The end of the air duct can be directly connected to each dispersion tube 5, such as Figure 3 As shown, the air duct end can also be connected to the annular tube 51, and then the dispersion tubes 5 are arranged in an annular array on the annular tube 51, as shown in FIG. Figure 4 shown.

[0028] In this embodiment, the boiler flue gas purification device also includes a secondary purification device, which includes a plurality of ultrasonic atomizers 7, and the ultrasonic atomizer 7 includes an atomizing sheet 8. The reducing agent solution can be immersed in the atomizing sheet 8, and the atomizing sheet 8 vibrates to atomize the reducing agent solution and gathers on the reducing agent solution surface and above the liquid surface, and the distance between the top surface of the atomizing sheet and the reducing agent solution surface is 1cm-6cm. Preferably, it is 2cm-5cm, because the oscillation energy generated by the atomizing sheet will propagate in the water along the direction perpendicular to the surface of the atomizing sheet. Under the condition of appropriate water depth, the water surface on the energy propagation axis will concentrate on a water column, and a large number of tiny tension waves will be concentrated at the front end of the water column, which will greatly reduce the surface tension of the raised water surface, and the water surface will be split into many tiny areas by the wavelength of the surface tension wave, and each area will become a microparticle independently as if they are not bonded to each other, and will be scattered in the air to form a fog effect. After a large number of tests, it is found that when the distance between the top surface of the atomizing sheet and the liquid surface of the reducing agent solution is 3cm-4.5cm, the atomizing sheet can maintain more efficient atomization and form more fine mist. In this way, the vibration of the atomizing sheet causes the reducing agent solution to be atomized to form a large amount of fine mist below 20 microns and gather on the liquid surface of the reducing agent solution and above the liquid surface of the reducing agent solution, so that a small part of the nitrogen dioxide emitted from the reducing agent solution can contact and fully mix with the reducing agent in the fine mist state, and a rapid reaction occurs, so that the nitrogen dioxide is quickly reduced to non-toxic and harmless nitrogen and water, achieving the purpose of nitrogen oxide purification. At the same time, because the reducing agent in the fine mist state gathers on the liquid surface of the reducing agent solution and above the liquid surface of the reducing agent solution, the local air relative humidity is quickly saturated, and the saturated water vapor condenses with dust particles as the nucleus to achieve the dust reduction effect, realizing the purification and dust removal of a small part of PM2.5-PM10 particles emitted from the reducing agent solution, and realizing further purification and dust removal of boiler flue gas. A demister 9 is provided above the liquid level of the reducing agent solution. The demister 9 is a metal wire mesh demister to further prevent the reducing agent solution from overflowing outside the reaction chamber, which increases the reducing agent consumption. A rain cover 10 is provided above the reaction chamber. The rain cover 10 is provided on the reaction chamber and a gap is left between the rain cover and the reaction chamber, which does not affect the escape of nitrogen and prevents rainwater from entering. The fan is preferably a brushless DC fan. A particulate matter sensor and / or a nitrogen oxide sensor is also provided on the rain cover or the reaction chamber to monitor the content of particulate matter and / or nitrogen oxides in real time. The above-mentioned reducing agent is a composite composed of multiple reducing agents, which has strong reducing properties. It is fully mixed with nitrogen oxides in the flue gas, and can reduce nitrogen oxides to non-toxic and harmless nitrogen and water, and is harmless to the atmosphere, such as low-temperature urea.

[0029] In a preferred embodiment, the ultrasonic atomizer 7 is fixedly connected to the reaction chamber 3 or the ultrasonic atomizer 7 is floatingly arranged in the reaction chamber 3. When the ultrasonic atomizer 7 is floatingly arranged in the reaction chamber, a hollow floating adjustment chamber 11 is provided in the reaction chamber. The floating adjustment chamber 11 is floated or suspended in the reducing agent solution of the reaction chamber. By mounting the ultrasonic atomizer 7 on the floating adjustment chamber 11, the atomizer sheet is suspended in the reducing agent solution. The floating adjustment chamber 11 is filled with liquid or foam or solid filler. By adjusting the liquid content or foam content or solid filler in the floating adjustment chamber, the distance between the top surface of the atomizer sheet and the liquid surface of the reducing agent solution is adjusted, so that the buoyancy of the atomizer sheet and the floating adjustment chamber and its own gravity reach a specific dynamic balance, so that the atomizer sheet can be adaptively adjusted according to the change of the liquid level, and the distance between the top surface of the atomizer sheet and the liquid surface of the reducing agent solution is always maintained between 3cm-4.5cm. The atomizer sheet is always suspended in the water and continuously and efficiently produces fine mist. The floating adjustment chamber has a simple structure for adjusting the position of the atomizer sheet and low cost. Furthermore, a water injection port 12 or a filling port is provided on the side wall or the top surface of the floating adjustment chamber 11, and the ultrasonic atomizers are evenly mounted on at least two floating adjustment chambers 11, and a recessed portion 13 is provided on the floating adjustment chamber. The ultrasonic atomizer 7 is fixed and mounted on the recessed portion 13 of the floating adjustment chamber, and the cross-section of the floating adjustment chamber is substantially rectangular, semicircular, semi-elliptical or fan-shaped, so the floating adjustment chamber and the ultrasonic atomizer are not easy to overturn, such as Figure 5-8 shown.

[0030] In a preferred embodiment, the reaction chamber 3 is connected to the pump body 14, the filter 15, and the water tank 16 through a pipeline. The water tank 16 is connected to a water source, and the water source replenishes water in the water tank. An automatic dosing device 17 is also provided on the water tank 16. The automatic dosing device 17 adds the reducing agent to the water in the water tank 16 to form a reducing agent solution of a specific ratio. A stirring device can also be further installed in the water tank to achieve full and rapid mixing of the reducing agent and water. The pump body 14 pumps the water with the reducing agent in the water tank, that is, the reducing agent solution, to the reaction chamber 3 to replenish the reducing agent solution in the reaction chamber; a drain valve 18 that can be opened and closed is provided at the lower part of the reaction chamber 3, and the drain valve 18 is connected to the water tank 16 to realize the recycling of the waste liquid in the reaction chamber; a liquid level sensor is also provided in the reaction chamber 3, and the liquid level sensor is connected to the pump body through a control system, and automatic liquid addition is achieved according to the liquid level detected by the liquid level sensor. Furthermore, the bottom of the reaction chamber 3 is funnel-shaped, and a drain valve 19 that can be opened and closed is provided at the bottom of the reaction chamber to facilitate the discharge of waste liquid containing large particle pollutants.

[0031] In the above technical solution, the fan 4 leads the boiler flue gas generated by the combustion boiler into the air duct 1, and the unpurified boiler flue gas is oxidized under the action of the primary oxidation device, so that the nitrogen monoxide pollutant is quickly oxidized into nitrogen dioxide. The boiler flue gas oxidized by the primary oxidation device 2 enters each dispersion pipe 5 through the air duct 1 and is then released into the reducing agent solution in the reaction chamber through the emission holes 6 on each dispersion pipe, that is, the particulate pollutants and nitrogen dioxide in the boiler flue gas are evenly dispersed to each dispersion pipe 5 along the air duct 1 and all are sprayed into the reducing agent solution in the reaction chamber 3 through the emission holes 6, so that the nitrogen dioxide is dissolved by the reducing agent solution and absorbed by the low-temperature chemical reaction to remove most of the nitrogen dioxide pollutants and intercept most of the large particle pollutants. The vibration of the atomizing sheet atomizes the reducing agent solution to form a large amount of fine mist below 20 microns and gathers on the surface of the reducing agent solution and above the surface of the reducing agent solution, so that a small part of the nitrogen dioxide emitted from the reducing agent solution can contact and fully mix with the reducing agent in the fine mist state, and a rapid reaction occurs, so that the nitrogen dioxide is quickly reduced to non-toxic and harmless nitrogen and water, achieving the purpose of nitrogen oxide purification. At the same time, because the reducing agent in the fine mist state gathers on the surface of the reducing agent solution and above the surface of the reducing agent solution, the local air relative humidity is quickly saturated, and the saturated water vapor condenses with dust particles as the nucleus to achieve the dust reduction effect, realizing the purification and dust removal of a small part of PM2.5-PM10 particles emitted from the reducing agent solution, and further purification and dust removal of boiler flue gas. It is only necessary to regularly add water and an appropriate amount of reducing agent to the water tank to achieve high-efficiency purification of boiler flue gas. The later maintenance operation is simple and low-cost, and the device can be directly used in conjunction with existing boilers, further reducing the installation cost.

[0032] The test shows that when the combustion boiler is in normal use, under the same experimental conditions, the nitrogen oxide concentration in the air within 5-10 meters around the exhaust port of the combustion boiler without the device installed is 1090-1157 micrograms / cubic meter; the nitrogen oxide concentration in the air within 5-10 meters around the combustion boiler with the device installed is 56-68 micrograms / cubic meter. The nitrogen oxide concentration in the air is greatly reduced, and the dust content in the air is also greatly reduced.

[0033] This embodiment is only an illustration of the concept and implementation of the present invention, and does not limit it. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A boiler flue gas purification device, comprising an air duct and a primary oxidation device, wherein the primary oxidation device is connected to the air duct, a fan is provided on the air duct, the fan guides unpurified boiler flue gas into the air duct and oxidizes the unpurified boiler flue gas through the primary oxidation device, characterized in that: It also includes a reaction chamber with a hollow structure, the air duct is inserted into the reaction chamber and connected to a plurality of dispersion tubes, a plurality of emission holes are opened on the dispersion tubes, a reducing agent solution is filled in the reaction chamber, the dispersion tubes extend from top to bottom and the emission holes are immersed in the reducing agent solution in the reaction chamber, and the boiler flue gas oxidized by the primary oxidation device enters each dispersion tube through the air duct and is then released into the reducing agent solution in the reaction chamber through the emission holes on each dispersion tube.

2. The boiler flue gas purification device according to claim 1, characterized in that: It also includes a secondary purification device, which includes a plurality of ultrasonic atomizers. The ultrasonic atomizer includes an atomizing sheet. The reducing agent solution can be immersed in the atomizing sheet. The atomizing sheet vibrates to atomize the reducing agent solution to gather on the reducing agent solution surface and above the liquid surface. The distance between the top surface of the atomizing sheet and the reducing agent solution surface is 1cm-6cm.

3. The boiler flue gas purification device according to claim 1 or 2, characterized in that: The diffusion holes on the dispersion pipe are provided with a plurality of upper and lower layers, and the diffusion holes are evenly distributed around the dispersion pipe.

4. The boiler flue gas purification device according to claim 3, characterized in that: The emission holes on the dispersion pipe are spirally distributed around the dispersion pipe from top to bottom. The annular array of the dispersion pipes is arranged at the end of the air duct and the end of the dispersion pipe is blocked.

5. The boiler flue gas purification device according to claim 1 or 2, characterized in that: The primary oxidation device is an ozone generator, and the ozone sprayed by the ozone generator can be sprayed into the air duct.

6. The boiler flue gas purification device according to claim 4, characterized in that: A drain valve that can be opened and closed is provided at the lower part of the reaction chamber, a defogger is provided above the liquid level of the reducing agent solution, a rain cover is provided above the reaction chamber, the rain cover is provided on the reaction chamber and a gap is left between the rain cover and the reaction chamber, a particle sensor and / or a nitrogen oxide sensor is provided on the rain cover or the reaction chamber, and the fan is a brushless DC fan; a plurality of air inlet holes are evenly opened in an annular direction on the air duct, and ozone sprayed from the ozone generator is sprayed into the air duct through the air inlet holes; or an air inlet pipe connected to the ozone generator is provided in the air duct, and a plurality of air inlet holes are opened on the air inlet pipe, and ozone sprayed from the ozone generator is sprayed into the air duct through the air inlet holes.

7. The boiler flue gas purification device according to claim 2, characterized in that: The ultrasonic atomizer is fixedly connected to the reaction chamber or the ultrasonic atomizer is floatingly arranged in the reaction chamber, and the distance between the top surface of the atomizer sheet and the liquid surface of the reducing agent solution is 2cm-5cm; when the ultrasonic atomizer is floatingly arranged in the reaction chamber, a hollow floating adjustment chamber is provided in the reaction chamber, and the floating adjustment chamber is floated or suspended in the reducing agent solution in the reaction chamber. The ultrasonic atomizer is carried on the floating adjustment chamber, and the floating adjustment chamber is filled with liquid or foam or solid filler. By adjusting the liquid content or foam content or solid filler in the floating adjustment chamber, the distance between the top surface of the atomizer sheet and the liquid surface of the reducing agent solution is adjusted.

8. The boiler flue gas purification device according to claim 7, characterized in that: A water injection port or a filling port is provided on the floating adjustment chamber, and each ultrasonic atomizer is mounted on at least two floating adjustment chambers; the distance between the top surface of the atomizing sheet and the liquid surface of the reducing agent solution is 3cm-4.5cm; a recessed portion is provided on the floating adjustment chamber, and the ultrasonic atomizer is mounted in the recessed portion of the floating adjustment chamber, and the cross-section of the floating adjustment chamber is basically rectangular, semicircular, semi-elliptical or fan-shaped.

9. The boiler flue gas purification device according to claim 6, characterized in that: The reaction chamber is connected to the pump body, the filter and the water tank through a pipeline. The water tank is connected to a water source. An automatic dosing device is also provided on the water tank. The automatic dosing device adds the reducing agent into the water in the water tank. The pump body pumps the water with the reducing agent in the water tank to the reaction chamber. The drain valve is connected to the water tank. A liquid level sensor is provided in the reaction chamber.

10. The boiler flue gas purification device according to claim 9, characterized in that: The bottom of the reaction chamber is funnel-shaped, and a drain valve that can be opened and closed is provided at the bottom of the reaction chamber.

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