Flue gas purification device

Abstract

The utility model discloses a flue gas purification device and relates to the technical field of flue gas pollutant treatment. The device comprises a tank body; the smoke inlet pipe is connected to the side wall of the lower part of the tank body and is communicated with the inner cavity of the tank body; the output end of the reducing agent supply assembly communicates with an inner cavity of the smoke inlet pipe; the plate surface of the sealing partition plate is horizontally mounted on the inner wall of the tank body above the corresponding smoke inlet pipe, and a plurality of smoke outlet holes are formed in the sealing partition plate at intervals; the smoke exhaust pipe is connected to the side wall of the tank body above the corresponding sealing partition plate and is communicated with the inner cavity of the tank body; the bottom ends of the catalytic filter cartridges are closed, the catalytic filter cartridges are fixed on the lower plate surface of the sealing partition plate, and the top opening ends of the catalytic filter cartridges are correspondingly communicated with the smoke outlet holes; according to the device, harmful compounds in flue gas can be oxidized and reduced, meanwhile, particulate matter in the flue gas can be filtered, and the device has the advantages of being clean, efficient, simple in structure, compact in layout and easy to control reaction.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas pollutant treatment, and more specifically to a flue gas purification device. Background Art

[0002] my country has many non-electric industries, mainly concentrated in the fields of steel, chemical industry, building materials, metallurgy, textile and waste incineration, which account for an important proportion in industrial production and national economy, and will dominate the future social development. Among them, the steel industry is the fourth largest source of pollution emissions in my country. Sintering, as the preparation link of steel smelting raw materials, will produce 50% of NO x , 48% of dioxins, and the smoke emission concentration is 100-20000mg·m-3, and micron and submicron particles exceed 60%. At the same time, most of the waste incineration boilers in the waste incineration industry also have NO x , problems with dioxin emissions exceeding standards or unstable control.

[0003] NO x It is an important precursor to photochemical smog and fine particulate matter, and chlorobenzene is an important precursor to dioxins. Dioxins are listed in the first batch of control lists of the Stockholm Convention on Persistent Organic Pollutants due to their environmental persistence and biological hazards. With the continuous deepening of the concept of coordinated control of multiple pollutants, the existing technology often adopts multiple single pollutant purification systems in series to remove processes, resulting in problems such as complex purification system equipment and high operating costs. Therefore, the development of NO x -Chlorobenzene-particulate matter multi-pollutant synergistic purification technology has become a development trend in the field of air governance. Utility Model Content

[0004] In view of this, the utility model aims to provide a method for converting NO x -Chlorobenzene-particulate matter coordinated purification flue gas purification device to solve the NO x The technical problems include the complex equipment for coordinated purification of dioxins and particulate matter and high operating costs.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A flue gas purification device, comprising:

[0007] A tank body, wherein a ash outlet is provided at the bottom of the tank body;

[0008] A smoke inlet pipe, the smoke inlet pipe is connected to the lower side wall of the tank body and communicates with the inner cavity of the tank body;

[0009] A reducing agent supply component, wherein the output end of the reducing agent supply component is connected to the inner cavity of the smoke inlet pipe;

[0010] A sealing baffle, wherein the sealing baffle is horizontally mounted on the inner wall of the tank body corresponding to the upper part of the smoke inlet pipe, and a plurality of smoke outlet holes are spaced apart from each other on the sealing baffle;

[0011] A smoke exhaust pipe, the smoke exhaust pipe is connected to the side wall of the tank body corresponding to the upper side of the sealing partition and communicates with the inner cavity of the tank body;

[0012] A plurality of catalytic filter cartridges, the bottom ends of the catalytic filter cartridges are closed, the catalytic filter cartridges are fixed on the lower plate surface of the sealing partition and the top open ends thereof are correspondingly connected to the smoke outlet holes;

[0013] A jet-type cleaning component, the jet end of which extends through the side wall of the tank body to the inner cavity of the tank body corresponding to the top of the sealing partition, and its jet end is arranged corresponding to the top opening of the catalytic filter cartridge.

[0014] The beneficial effects that can be achieved by the utility model are as follows: under the catalysis of the catalytic filter cartridge, harmful substances in the flue gas are oxidized and reduced by the reducing agent, and at the same time, particulate matter in the flue gas is also intercepted at the catalytic filter cartridge and blown off by the jet cleaning component and discharged from the ash outlet, thereby achieving the coordinated purification of harmful substances and particulate matter in the smoke. The device has a simple structure, a small size and a low cost.

[0015] Furthermore, the reductant supply assembly includes a reductant storage tank and a reductant delivery pipeline, one end of the reductant delivery pipeline is connected to the inner cavity of the reductant storage tank, and the other end passes through the side wall of the smoke inlet pipe and extends into the inner cavity of the smoke inlet pipe.

[0016] Furthermore, the jet cleaning assembly includes a compressed air storage tank, an air pipeline and a plurality of nozzles, one end of the air pipeline is connected to the air outlet of the compressed air storage tank, and the other end passes through the side wall of the tank body and extends to the inner cavity of the tank body above the sealing partition; the plurality of nozzles correspond one-to-one to the plurality of catalytic filter cartridges, and the air inlet end of each nozzle is connected to the other end of the air pipeline, and its jet end is arranged corresponding to the top opening of the catalytic filter cartridge.

[0017] Furthermore, a gas transmission channel control component for controlling the on-off of the gas transmission channel is provided, and the gas transmission channel control component includes a pulse controller and a pulse solenoid valve, the pulse solenoid valve is installed on the gas transmission pipeline, and the pulse controller is electrically connected to the pulse solenoid valve.

[0018] Furthermore, the catalytic filter cartridge includes a filter cartridge body with a closed bottom end and a catalyst layer coated on the surface of the filter cartridge body.

[0019] Furthermore, the catalytic filter cartridge is a ceramic fiber filter cartridge containing catalyst material, and the bottom end of the ceramic fiber filter cartridge is closed.

[0020] Furthermore, a heater is provided, which includes a heating device and a heat exchange tube connected to the heating device. An interlayer is provided in the side wall of the smoke inlet pipe, and the heat exchange tube is installed in the interlayer near the outlet of the smoke inlet pipe.

[0021] Furthermore, the heating device adopts a photovoltaic power generation heating device or a ground source heat pump heating device.

[0022] Furthermore, a temperature sensor is provided, and the temperature sensor is installed on the inner wall of the tank below the sealing partition.

[0023] Furthermore, a flue gas analysis component is provided, which includes a smoke intake smoke analyzer and a smoke exhaust smoke analyzer, wherein a detection end of the smoke intake smoke analyzer is connected to the smoke intake pipe, and a detection end of the smoke exhaust smoke analyzer is connected to the smoke exhaust pipe.

[0024] It can be seen from the above technical solution that compared with the prior art, the utility model discloses a flue gas purification device that can oxidize and reduce harmful compounds in the flue gas and filter particulate matter in the flue gas. It has the advantages of cleanliness and high efficiency, simple structure, compact layout, and easy reaction control. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below.

[0026] Figure 1 The utility model provides a schematic diagram of the structure of a flue gas purification device.

[0027] In the figure: 1. tank body, 101. ash outlet, 2. smoke inlet pipe, 3. reducing agent supply assembly, 301. reducing agent storage tank, 302. reducing agent delivery pipeline, 4. sealing partition, 5. exhaust pipe, 6. catalytic filter cartridge, 7. jet cleaning assembly, 701. compressed air storage tank, 702. gas pipeline, 703. nozzle, 8. gas transmission channel control assembly, 801. pulse controller, 802. pulse solenoid valve, 9. heater, 901. heating device, 902. heat exchange tube, 10. temperature sensor, 11. smoke inlet flue gas analyzer, 12. exhaust flue gas analyzer. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0029] See also Figure 1 This embodiment provides a method for treating NO in flue gas.x -Chlorobenzene-particulate matter coordinated purification device, comprising:

[0030] The tank body 1 has an inverted cone-shaped structure at the bottom, and an ash outlet 101 is provided at the bottom;

[0031] A smoke inlet pipe 2, which is connected to the lower side wall of the tank body 1 and communicates with the inner cavity of the tank body 1;

[0032] A reducing agent supply component 3, wherein the output end of the reducing agent supply component 3 is connected to the inner cavity of the smoke inlet pipe 2;

[0033] A sealing baffle 4, the plate surface of which is horizontally mounted on the inner wall of the tank body 1 above the corresponding smoke inlet pipe 2, and a plurality of smoke outlet holes are spaced apart on the sealing baffle 4;

[0034] A smoke exhaust pipe 5, which is connected to the side wall of the tank body 1 above the corresponding sealing partition 4 and communicates with the inner cavity of the tank body 1;

[0035] A plurality of catalytic filter cartridges 6, the bottom end of the catalytic filter cartridge 6 is closed, the catalytic filter cartridge 6 is fixed on the lower plate surface of the sealing partition 4 and the top open end thereof is correspondingly connected to the smoke outlet;

[0036] The jet-type cleaning component 7 has a jet end extending through the side wall of the tank body 1 to the inner cavity of the tank body 1 above the corresponding sealing partition 4, and its jet end is arranged corresponding to the top opening of the catalytic filter cartridge 6.

[0037] This device can remove NO in the flue gas. x The chlorobenzene and reducing agent are mixed in the smoke inlet pipe 2 and then enter the tank 1. Under the catalysis of the catalytic filter cartridge 6, NO in the flue gas is reduced. x After being oxidized and reduced, chlorobenzene is discharged from the exhaust pipe 5. At the same time, the particulate matter in the flue gas is also filtered at the catalytic filter cartridge 6. The particulate matter attached to the catalytic filter cartridge 6 is blown off by the airflow of the jet cleaning component 7 and discharged from the ash outlet 101 at the bottom of the tank body 1, achieving NO x -Chlorobenzene-particulate matter collaborative purification.

[0038] Preferably, the reducing agent supply assembly 3 includes a reducing agent storage tank 301 and a reducing agent delivery pipe 302, one end of the reducing agent delivery pipe 302 is connected to the inner cavity of the reducing agent storage tank 301, and the other end passes through the side wall of the smoke inlet pipe 2 and extends into the inner cavity of the smoke inlet pipe 2. The reducing agent is ammonia, which can be prepared from ammonia water, liquid ammonia or urea. The preparation method is a prior art and will not be repeated here. In a specific embodiment, the reducing agent supply assembly 3 can adopt an ammonia injection device provided in the patent with publication number CN205145986U.

[0039] Preferably, the jet-type dust cleaning assembly 7 includes a compressed air storage tank 701, a gas pipeline 702 and a plurality of nozzles 703, one end of the gas pipeline 702 is connected to the gas outlet of the compressed air storage tank 701, and the other end passes through the side wall of the tank body 1 and extends to the inner cavity of the tank body 1 above the sealing partition 4; the plurality of nozzles 703 correspond to the plurality of catalytic filter cartridges 6 one by one, and the air inlet end of each nozzle 703 is connected to the other end of the gas pipeline 702, and the jet end thereof is arranged corresponding to the top opening of the catalytic filter cartridge 6. The particulate matter deposited on the surface of the filter cartridge is blown off by the high-pressure airflow ejected from the nozzle 703 and discharged from the ash outlet 101 at the bottom of the tank body 1.

[0040] Specifically, a gas transmission channel control component 8 for controlling the on-off of the gas transmission channel is also provided. The gas transmission channel control component 8 includes a pulse controller 801 and a pulse solenoid valve 802. The pulse solenoid valve 802 is installed on the gas transmission pipeline 702, and the pulse controller 801 is electrically connected to the pulse solenoid valve 802.

[0041] In a specific embodiment, the catalytic filter cartridge 6 comprises a filter cartridge body with a closed bottom end and a catalyst layer coated on the surface of the filter cartridge body. The catalyst is a vanadium tungsten titanium catalyst V2O5-WO3-TiO2 or a vanadium molybdenum titanium catalyst V2O5-MoO3-TiO2.

[0042] Among them, under the action of catalyst, NO x The reaction formula is: NO x +NH3+O2→N2+H2O

[0043] The reaction formula of chlorobenzene is: chlorobenzene + O2 → CO2 + HCl + H2O

[0044] In another specific embodiment, the catalytic filter cartridge 6 is a ceramic fiber filter cartridge containing a vanadium-tungsten-titanium catalyst or a vanadium-molybdenum-titanium catalyst, and the bottom end of the ceramic fiber filter cartridge is closed.

[0045] Preferably, a heater 9 is further provided, the heater 9 includes a heating device 901 and a heat exchange tube 902 connected to the heating device 901, the heat exchange tube preferably adopts a spiral heat exchange tube, a sandwich is provided in the side wall of the smoke inlet pipe 2, and the heat exchange tube 902 is installed in the sandwich near the outlet of the smoke inlet pipe 2 to provide the temperature required for the reaction.

[0046] Specifically, the heating device 901 adopts a photovoltaic power generation heating device or a ground source heat pump heating device, which is clean and environmentally friendly.

[0047] Preferably, a temperature sensor 10 is further provided. The temperature sensor 10 is installed on the inner wall of the tank body 1 below the sealing partition 4 and is used to detect the temperature inside the tank body 1 to improve the purification efficiency.

[0048] Preferably, a heat-insulating layer is provided on the outer side walls of the tank body 1, the smoke inlet pipe 2 and the smoke exhaust pipe 5 to reduce heat loss.

[0049] Preferably, a flue gas analysis component is also provided, which includes an inlet smoke analyzer 11 and an exhaust smoke analyzer 12. The detection end of the inlet smoke analyzer 11 is connected to the smoke inlet pipe 2, and the detection end of the exhaust smoke analyzer 12 is connected to the exhaust pipe 5. It is used to detect and analyze the flue gas purification efficiency, and by observing the purification efficiency, it can also be known whether a new filter cartridge needs to be replaced.

[0050] Preferably, an HCl adsorption device may be provided at the smoke outlet of the smoke exhaust pipe 5 to prevent HCl from being directly discharged into the atmosphere.

[0051] Working principle: NO in flue gas x After being fully mixed with chlorobenzene and the reducing agent in the smoke inlet pipe 2, they enter the tank body 1. The heating device provides the high temperature environment required for the reaction. Under the catalysis of the catalytic filter cartridge 6, NO in the flue gas is reduced. x The clean harmless substances generated by oxidation and reduction of chlorobenzene are discharged from the exhaust pipe 5. At the same time, the particulate matter in the flue gas is also filtered at the catalytic filter cartridge 6. The particulate matter attached to the catalytic filter cartridge 6 is blown off by the airflow of the jet cleaning component 7 and discharged from the ash outlet 101 at the bottom of the tank body 1, achieving NO x -Chlorobenzene-particulate matter collaborative purification.

[0052] Embodiment 1:

[0053] This example is used to investigate the NO x Conversion rate, chlorobenzene oxidation rate and particulate matter removal rate.

[0054] Experimental conditions: Inlet flue gas components NO x Volume fraction 0.05%, chlorobenzene volume fraction 0.02%, O2 volume fraction 5.0%, particle mass concentration 200mg·m -3 , N2 is the balance gas, the volume fraction of reducing agent NH3 is 0.05%, and the reaction temperature is 160℃~340℃.

[0055] Test results: At 200℃~340℃, NO x The conversion rate and chlorobenzene oxidation rate reached 90%, and the particle removal rate exceeded 99.9%. The specific experimental results are shown in Table 1.

[0056] Table 1

[0057] Purification rate / reaction temperature 160℃ 180℃ 200℃ 250℃ 300℃ 340℃ <![CDATA[NO x Conversion rate / %]]> 77.2 95.6 98.3 99.1 99.3 99.5 Chlorobenzene oxidation rate / % 47.6 69.5 90.7 98.8 99.2 99.5 Particle removal rate / % 99.9 99.9 99.9 99.9 99.9 99.9

Claims

1. A flue gas purification device, characterized in that: include: A tank body (1), wherein a dust outlet (101) is provided at the bottom of the tank body (1); A smoke inlet pipe (2), the smoke inlet pipe (2) being connected to the lower side wall of the tank body (1) and communicating with the inner cavity of the tank body (1); A reducing agent supply component (3), wherein the output end of the reducing agent supply component (3) is connected to the inner cavity of the smoke inlet pipe (2); A sealing baffle (4), wherein the plate surface of the sealing baffle (4) is horizontally mounted on the inner wall of the tank body (1) above the corresponding smoke inlet pipe (2), and a plurality of smoke outlet holes are spaced apart on the sealing baffle (4); A smoke exhaust pipe (5), the smoke exhaust pipe (5) being connected to the side wall of the tank body (1) above the corresponding sealing baffle (4) and communicating with the inner cavity of the tank body (1); A plurality of catalytic filter cartridges (6), wherein the bottom end of the catalytic filter cartridge (6) is closed, the top end of the catalytic filter cartridge (6) is fixed on the lower plate surface of the sealing partition (4) and the top open end thereof is correspondingly connected to the smoke outlet hole; A jet-type cleaning component (7), wherein the jet end of the jet-type cleaning component (7) extends through the side wall of the tank body (1) to the inner cavity of the tank body (1) above the sealing partition (4), and the jet end is arranged corresponding to the top opening of the catalytic filter cartridge (6).

2. A flue gas purification device according to claim 1, characterized in that: The reducing agent supply assembly (3) comprises a reducing agent storage tank (301) and a reducing agent delivery pipeline (302); one end of the reducing agent delivery pipeline (302) is connected to the inner cavity of the reducing agent storage tank (301), and the other end passes through the side wall of the smoke inlet pipe (2) and extends into the inner cavity of the smoke inlet pipe (2).

3. A flue gas purification device according to claim 1, characterized in that: The jet-type cleaning component (7) comprises a compressed air storage tank (701), an air pipeline (702) and a plurality of nozzles (703); one end of the air pipeline (702) is connected to the air outlet of the compressed air storage tank (701), and the other end thereof passes through the side wall of the tank body (1) and extends to the inner cavity of the tank body (1) above the sealing partition (4); the plurality of nozzles (703) correspond one-to-one to the plurality of catalytic filter cartridges (6), and the air inlet end of each nozzle (703) is connected to the other end of the air pipeline (702), and the jet end thereof is arranged corresponding to the top opening of the catalytic filter cartridge (6).

4. A flue gas purification device according to claim 3, characterized in that: A gas transmission channel control component (8) for controlling the on and off of the gas transmission channel is also provided. The gas transmission channel control component (8) comprises a pulse controller (801) and a pulse solenoid valve (802). The pulse solenoid valve (802) is installed on the gas transmission pipeline (702). The pulse controller (801) is electrically connected to the pulse solenoid valve (802).

5. A flue gas purification device according to claim 1, characterized in that: The catalytic filter cartridge (6) comprises a filter cartridge body with a closed bottom end and a catalyst layer coated on the surface of the filter cartridge body.

6. A flue gas purification device according to claim 1, characterized in that: The catalytic filter cartridge (6) is a ceramic fiber filter cartridge containing catalyst material, and the bottom end of the ceramic fiber filter cartridge is closed.

7. A flue gas purification device according to claim 1, characterized in that: A heater (9) is also provided, the heater (9) comprising a heating device (901) and a heat exchange tube (902) connected to the heating device (901), an interlayer is provided in the side wall of the smoke inlet pipe (2), and the heat exchange tube (902) is installed in the interlayer near the outlet of the smoke inlet pipe (2).

8. A flue gas purification device according to claim 7, characterized in that: The heating device (901) adopts a photovoltaic power generation heating device or a ground source heat pump heating device.

9. A flue gas purification device according to claim 8, characterized in that: A temperature sensor (10) is also provided, and the temperature sensor (10) is installed on the inner wall of the tank body (1) below the sealing partition (4).

10. A flue gas purification device according to claim 1, characterized in that: A smoke analysis component is also provided, the smoke analysis component comprising a smoke intake smoke analyzer (11) and a smoke exhaust smoke analyzer (12), the air intake of the smoke intake smoke analyzer (11) being connected to the smoke intake pipe (2), and the air intake of the smoke exhaust smoke analyzer (12) being connected to the smoke exhaust pipe (5).

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