Flue gas treatment device

Abstract

The present invention provides a flue gas treatment device for purifying flue gas. The device includes a pretreatment unit and a reprocessing unit. The pretreatment unit includes a shell, and a treatment liquid contained in a cavity in the shell; a channel for flue gas to flow through is formed in the cavity above the liquid level of the treatment liquid, and a water curtain formed by the treatment liquid is arranged in the channel; as the flue gas passes through the water curtain, the treatment liquid absorbs part of the pollutants in the flue gas. The reprocessing unit receives the flue gas discharged by the pretreatment unit and discharges it; the reprocessing unit is filled with a treatment material, which can adsorb or catalyze the reaction of at least one gaseous pollutant in the flue gas flowing through, thereby purifying the flue gas. The flue gas treatment device of the present invention can reduce the maintenance cost of the filter material or catalytic material in the flue gas treatment device and improve the treatment operation stability of the device.

Description

Technical Field

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

[0002] With the development of social industry, the impact of combustion waste gas, automobile exhaust, etc. on the atmosphere is becoming more and more serious. Therefore, countries are paying more and more attention to environmental protection, and the emission requirements for various types of combustion waste gas and exhaust gas are constantly increasing. Whether it is the smoke from farmers' coal combustion or the catering industry, or automobile exhaust, the gas containing harmful substances must be treated first, and only after meeting certain index requirements can it be discharged into the atmosphere. In some specific industries or environments with higher requirements for air cleanliness, the air needs to be purified with higher requirements to meet the requirements of use. Therefore, gas treatment and purification technology has been deeply developed and widely used.

[0003] In the existing flue gas treatment devices for flue gas generated by burning loose coal, catering, etc., as well as automobile exhaust, filtering or three-way catalytic converters are generally used for treatment. However, the flue gas is rich in a large amount of smoke and oil, which can easily cause clogging of the filter material or failure of the catalyst. Not only is the treatment cost high, the workload of replacement and maintenance is large, and the treatment effect is not ideal. Summary of the invention

[0004] In view of this, the present invention aims to provide a flue gas treatment device to reduce the maintenance cost of filter materials or catalytic materials in the flue gas treatment device and improve the treatment operation stability of the device.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A flue gas treatment device, used for purifying flue gas, comprising:

[0007] A pretreatment unit, the pretreatment unit comprising a shell, and a treatment liquid contained in a cavity in the shell; a channel for the flue gas to flow through is formed in the cavity above the liquid level of the treatment liquid, and a water curtain formed by the treatment liquid is arranged in the channel; as the flue gas passes through the water curtain, the treatment liquid absorbs part of the pollutants in the flue gas;

[0008] The reprocessing unit receives and discharges the flue gas discharged from the preprocessing unit. The reprocessing unit is filled with a processing material, which can adsorb or catalyze the reaction of at least one gaseous pollutant in the flue gas flowing through, thereby purifying the flue gas.

[0009] Furthermore, the aftertreatment unit is a three-way catalytic converter, and the treatment material is a purifier in the three-way catalytic converter; the aftertreatment unit is arranged in the flow path of the flue gas upstream of the pretreatment unit, and the operating temperature of the aftertreatment unit can be increased by means of the heat in the flue gas.

[0010] Furthermore, a cooling unit is provided on the flow passage of the flue gas upstream of the pre-treatment unit; the flue gas flowing through the outside of the re-treatment unit is cooled by the cooling unit and then enters the pre-treatment unit.

[0011] Furthermore, the reprocessing unit is an activated carbon adsorption unit, and the processing material is activated carbon.

[0012] Furthermore, both ends of the shell are provided with an air inlet and an air outlet for the smoke to enter and exit the cavity, and the pretreatment unit also includes a filter component separated between the air inlet and the air outlet and driven to rotate in the cavity; the filter component is partially flushed in the treatment liquid, and the part of the filter component soaked in the treatment liquid and located in the channel constitutes the water curtain.

[0013] Furthermore, the filter component is a rotating body, and the cavity where the filter component is located has a space for the filter component to rotate in a sealed manner in the cavity.

[0014] Furthermore, the filter component includes a frame, and a thin-walled filter body arranged in the frame; the filter body is in the shape of a curved surface that is raised facing the flow direction of the smoke, and the filter body is a filter that can intercept and filter out smoke dust in the smoke.

[0015] Furthermore, a material holding basket is arranged in the cavity between the filter component and the air outlet, and a filling port facing the material holding basket is opened in the upper part of the shell, and the pretreatment unit also includes a stuffing box that can be inserted into the material holding basket through the filling port, and the stuffing box is filled with filler that can improve the treatment performance of the treatment liquid.

[0016] Furthermore, the bottom of the shell is constructed with a sedimentation tank which is connected to the cavity and inclined downward against the flow of the flue gas; the sediment captured or generated by the treatment liquid slides to the end of the sedimentation tank through the sedimentation tank, and is discharged into the waste storage bin below the discharge port through the discharge port opened at the end; a waste discharge valve is provided at the bottom of the waste storage bin.

[0017] Furthermore, a liquid level detection device capable of monitoring the treatment liquid in the cavity and a pressure detection device capable of detecting the pressure on both sides of the filter component are provided on the shell.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The flue gas treatment device described in the present invention first pre-treats the flue gas through a pre-treatment unit. The treatment liquid in the pre-treatment unit can effectively absorb the smoke dust in the flue gas, as well as gaseous pollutants that are easily soluble in the treatment liquid or react with the treatment liquid. The flue gas is then further treated by a post-treatment unit to achieve good purification of the flue gas, which is beneficial to reducing the maintenance cost of the filter material or catalytic material in the flue gas treatment device and improving the treatment operation stability of the device.

[0020] (2) Using a three-way catalytic converter as the aftertreatment unit can effectively remove harmful gases such as carbon monoxide and nitrogen oxides from automobile exhaust. The technology is mature and effective. The heat of the initial flue gas is used to increase the temperature of the aftertreatment unit so that the flue gas whose temperature drops after passing through the pretreatment unit can obtain a good catalytic reaction temperature condition, which helps to improve the treatment and purification effect of the aftertreatment unit.

[0021] (3) After the flue gas flows through the outside of the reprocessing unit, it is cooled down by the cooling unit and then enters the pretreatment unit for pretreatment. This can reduce the situation where the flue gas temperature is too high and the treatment liquid is easily vaporized, which is conducive to the stability of the absorption treatment conditions inside the pretreatment unit.

[0022] (4) The use of activated carbon for flue gas reprocessing can effectively absorb oil, gas and toxic gases in the flue gas. It is suitable for scenarios such as oil fume purification in the catering industry where there are dense crowds of people and high purification requirements.

[0023] (5) The filter component is partially immersed and rotatably installed in the shell; when the flue gas flows through the filter component, the smoke dust can be removed due to the interception of the filter component and the attachment of the treatment liquid, and the harmful gases in the flue gas can also be reacted or dissolved and absorbed by the suitable treatment liquid; the intercepted dust or absorbed substances can also be flushed into the treatment liquid and leave the filter component; so that the pretreatment unit not only has a better treatment effect, but also the filter material in the filter component has a longer life due to timely flushing, which is conducive to further reducing the cost of flue gas treatment and purification.

[0024] (6) The cavity and the filter component are in the shape of a rotating body, which is conducive to the rotation arrangement of the filter component and allows the filter component to separate the cavity well, thereby creating good conditions for the circulation and filtration of smoke.

[0025] (7) The use of filter bodies can achieve the desired filtering effect and is also conducive to the installation of the filter body on the frame and the flushing of the filter body. The curved surface structure of the filter body can use centrifugal force to throw out solid impurities attached to the filter body, which helps to clean the filter body. The use of filter screens is easy to equip, suitable for flushing and cleaning, and has high durability.

[0026] (8) A material holding basket is set in the cavity, and fillers such as limestone and calcite are conveniently added through a filler box. As the filler slowly dissolves, the alkalinity of the treatment liquid can be maintained, which is beneficial to the neutralization reaction of sulfides, nitrogen oxides, etc. in the flue gas after they are dissolved in the treatment liquid, thereby continuously improving the treatment performance of the treatment liquid.

[0027] (9) A sedimentation tank is constructed at the bottom of the shell to accumulate and slide out solid matter suspended in the treatment liquid or generated by reaction and slowly settled, thereby improving the clarity of the treatment liquid.

[0028] (10) A liquid level detection device is added to the shell. When the solid matter is discharged from the discharge port and the liquid is taken away, causing the liquid level of the treated liquid to drop, the liquid can be replenished in real time through the filling port, thereby maintaining the liquid level of the treated liquid and creating good conditions for the replacement or recycling of the treated liquid. This is beneficial to maintaining the treatment performance of the device. The pressure detection device can timely detect the differential pressure on both sides of the filter component and promptly detect the blockage of the filter body, which is beneficial to the operation and maintenance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention. The directional terms such as front and back, up and down, etc. involved therein are only used to indicate relative positional relationships and do not constitute improper limitations on the present invention. In the accompanying drawings:

[0030] Figure 1 A schematic diagram of the system structure of a flue gas treatment device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the overall structure of the flue gas treatment device according to an embodiment of the present invention;

[0032] Figure 3 A schematic diagram of the overall structure of the flue gas treatment device according to an embodiment of the present invention from another perspective;

[0033] Figure 4 This is a schematic diagram of the internal structure of the flue gas treatment device according to an embodiment of the present invention;

[0034] Figure 5 for Figure 2 A schematic diagram of the cross-sectional structure of the pretreatment unit at the position indicated by AA;

[0035] Figure 6 for Figure 5 A partial enlarged view of the part shown in B;

[0036] Figure 7 A schematic cross-sectional structure diagram of another pre-processing unit according to an embodiment of the present invention;

[0037] Figure 8A schematic diagram of the structural relationship of the stuffing box according to an embodiment of the present invention being inserted into the material containing basket;

[0038] Description of reference numerals:

[0039] 1-shell, 100-lower shell, 101-inlet side plate, 102-exhaust side plate, 103-sedimentation tank, 104-packaging flange, 105-fastening bolt, 106-inlet, 1061-water shield, 107-liquid blocking basket, 1071-liquid drain hole, 108-outlet, 1081-lower elbow, 109-air supply port, 110-upper shell, 120-filling port, 130-waste storage bin, 133-drain port, 134-waste discharge valve, 140-material storage basket, 143-stuffing box, 1430-material cavity, 1431-supporting flange, 1432-avoidance part, 1433-through hole, 144-through hole, 150-sprinkler;

[0040] 2-filter component, 200-filter body, 201-frame, 202-support frame, 203-rotating shaft, 204-motor, 205-bearing, 206-shaft seal, 207-seal body;

[0041] 3-reprocessing unit, 300-processing material, 301-heat exchange box, 4-cooling unit, 401-cooling fan, 402-cooling heat exchanger, 501-temperature measuring device, 502-liquid level detection device, 503-pressure detection device, 601-smoke inlet, 602-return pipeline, 603-exhaust port, 604-drainage fan. DETAILED DESCRIPTION

[0042] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0043] In addition, in the description of the present invention, the directional nouns such as left, right, up, and down involved are for the convenience of description and are based on the terms in the illustrated state, and should not be understood as constituting a limitation on the structure of the present invention.

[0044] The present embodiment relates to a flue gas treatment device, which can reduce the maintenance cost of filter materials or catalytic materials in the flue gas treatment device and improve the processing and operation stability of the device. The flue gas treatment device is used for purifying flue gas, and mainly includes a pretreatment unit and a reprocessing unit. The pretreatment unit includes a shell, and a treatment liquid contained in a cavity in the shell; a channel for the flue gas to flow through is formed in the cavity above the liquid level of the treatment liquid, and a water curtain formed by the treatment liquid is arranged in the channel; because the flue gas passes through the water curtain, the treatment liquid absorbs part of the pollutants in the flue gas. The reprocessing unit receives the flue gas discharged by the pretreatment unit and discharges it; the reprocessing unit is filled with a treatment material, and the treatment material can adsorb or catalyze the reaction of at least one gaseous pollutant in the flue gas flowing through, thereby purifying the flue gas.

[0045] Based on the above-mentioned overall structural principle, the present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Figure 1 As shown, it mainly includes a pipeline for flue gas to flow through, a pre-treatment unit and a re-treatment unit 3.

[0046] like Figure 2 As shown, the pretreatment unit includes a shell 1 and a treatment liquid contained in a cavity in the shell 1; a channel for flue gas to flow through is formed in the cavity above the liquid level of the treatment liquid, and a water curtain formed by the treatment liquid is arranged in the channel; when the flue gas passes through the water curtain, the treatment liquid of the water curtain will absorb pollutants such as smoke dust in the flue gas.

[0047] Combination Figure 3 and Figure 4 As shown, the two ends of the shell 1 are respectively provided with an air inlet 106 and an air outlet 108 for smoke to enter and exit the cavity, and the pretreatment unit also includes a filter component 2 separated between the air inlet 106 and the air outlet 108 and driven and rotatably arranged in the cavity; the filter component 2 is partially flushed in the treatment liquid, and the part of the filter component 2 infiltrated with the treatment liquid and located in the channel constitutes a water curtain; in addition, it can also be used Figure 5 The spray head 150 shown in the figure forms a water curtain.

[0048] The filter component 2 is partially immersed and rotatably installed in the shell 1; when the flue gas flows through the filter component 2, the smoke dust can be removed due to the interception of the filter component 2 and the attachment of the treatment liquid, and the harmful gas in the flue gas can also be reacted or dissolved and absorbed by the suitable treatment liquid; the intercepted dust or absorbed substances can also be flushed into the treatment liquid and leave the filter component 2; so that the pretreatment unit not only has a better treatment effect, but also the filter material in the filter component 2 has a longer life due to timely flushing, which is conducive to further reduction of flue gas treatment and purification costs.

[0049] Specifically, a preferred structure is: the housing 1 is constructed into a lower housing 100 and an upper housing 110, and the air inlet side plate 101 and the exhaust side plate 102 at both ends of the housing 1 can be integrally constructed with the lower housing 100. After the filter component 2 and other components are assembled into the cavity of the housing 1 through the opening on the top of the housing 1, the upper housing 110 is covered, and the sealing flange 104 of the lower housing 100 and the upper housing 110 are sealed and fastened by the fastening bolts 105 to form a closed cavity.

[0050] The air inlet 106 of the cavity can be arranged on the air inlet side plate 101, and the air outlet 108 can be arranged on the air outlet side plate 102. Obviously, at least the air outlet 108 needs to be opened near the upper part of the shell 1 to prevent the process liquid from flooding the air outlet 108 after the cavity is filled with the process liquid. The filter component 2 is arranged in the cavity to separate the air inlet 106 and the air outlet 108. The filter component 2 adopts a rotatable assembly structure and can be driven to rotate by an external force. Figure 4 , 5 As shown, the filter component 2 can be fixed on the rotating shaft 203, one end or both ends of the rotating shaft 203 are penetrated on the housing 1, one end of which passes through the side wall of the housing 1 and is exposed outside the housing 1, and a motor 204 is installed at this end, and the filter component 2 is driven to rotate in the cavity by the motor 204. Preferably, a bearing 205 and a shaft seal 206 are installed at the part where the rotating shaft 203 passes through the side wall of the housing 1, and bearings 205 are also installed at other pivoting and fixing parts of the rotating shaft 203 to improve the rotation stability of the rotating shaft 203 in the cavity.

[0051] As the filter component 2 rotates, the treatment liquid flushes the filter component 2 to remove the pollutants attached to the filter component 2. It should be noted that the treatment liquid in the cavity cannot be filled up so that the filter component 2 can be partially immersed in the treatment liquid and flush the filter component 2 as the filter component 2 rotates. At the same time, a channel for the flue gas to flow through is formed above the liquid surface of the treatment liquid. When the flue gas flows through, it will pass through the filter component 2 soaked with the treatment liquid; due to the interception and filtration of the filter component 2, the smoke in the gas will be processed; the gaseous harmful substances contained in the gas, such as sulfur dioxide, can be treated by configuring an alkaline treatment liquid that can react with sulfur dioxide, and other harmful gases can also be configured with corresponding treatment liquids to achieve a targeted treatment effect; in this way, these harmful substances will be dissolved, absorbed or reacted by the treatment liquid to form solid sediments that are insoluble in water. Thereby achieving the effect of the gas treatment device removing various harmful substances in the gas.

[0052] Combination Figure 5As shown, a water shield 1061 can be installed on the inner side of the air inlet 106 to prevent the liquid from flowing back into the air supply pipeline of the air inlet 106 when the treated liquid fluctuates or splashes. Preferably, the water shield 1061 is arranged on the entrance of the air inlet 106 using an arc-shaped plate cover, and the upper and lower parts of the water shield 1061 are fixed on the inner wall of the air inlet end side plate 101, and the left and right sides of the water shield 1061 are open for gas to enter the cavity. At the same time, in order to prevent the treated liquid from splashing into the air outlet 108, a liquid blocking basket 107 can be arranged on the inner wall of the exhaust end side plate 102, and the liquid blocking basket 107 is arranged around the air outlet 108, and a plurality of drainage holes 1071 are opened at the bottom of the side wall of the liquid blocking basket 107, and the end of the air outlet 108 in the cavity is constructed as a lower elbow 1081 that is open downward and close to the bottom surface of the liquid blocking basket 107. In this way, even if part of the processing liquid splashes into the liquid blocking basket 107 , it is difficult for it to enter the gas outlet 108 , but flows back into the cavity through the liquid leakage hole 1071 .

[0053] Still Figure 4 and Figure 5 As shown, the structural shapes of the housing 1 and the filter component 2 can be flexibly designed. Preferably, the exterior of the housing 1 is designed to facilitate the fixing of the device. The filter component 2 in the housing 1 adopts a rotating body shape. To ensure its good rotation operation, the cavity where the filter component 2 is located has a space for the filter component 2 to rotate in the cavity in a sealed manner; for the convenience of construction, the cavity is preferably in a cylindrical shape. Of course, except for the space for the filter component 2 to rotate, the shapes of the cavity and other parts of the housing 1 can be constructed in various shapes as needed. For example, the inner wall of the cavity is set to a cylindrical shape, or the cavity is directly set to a cylindrical shape, and the filter component 2 is designed as a rotating body coaxial with the cavity. The cavity and the filter component 2 adopt a rotating body shape, which is conducive to the rotation arrangement of the filter component 2, and the filter component 2 can separate the cavity well, thereby creating good conditions for the circulation and filtration of the gas.

[0054] like Figure 6 As shown, the filter component 2 includes a frame 201 and a thin-walled filter body 200 arranged in the frame 201; the filter body 200 is a curved surface convex facing the flow direction of the smoke, and the filter body 200 is a filter screen that can intercept and filter smoke in the smoke.

[0055] It should be pointed out that the material of the filter body 200 can be a filter cloth, a filter screen, a filter disc made of activated carbon or filter stone, etc. When there are multiple layers of filter bodies 200 in the same filter component 2, each filter body 200 can use the same filter material or a combination of multiple filter materials. When a filter screen is used, it can be a metal mesh, a plastic fiber mesh, etc., which can be flexibly selected according to the pollutants contained in the gas; the filtering fineness of the mesh, that is, the mesh number specification of the mesh, can be equipped according to the gas treatment requirements. When the filter body 200 uses a filter screen, it is easy to equip, and has the characteristics of being suitable for flushing and cleaning, and high durability. When the filter body 200 is an activated carbon filter disc, since the activated carbon also has a good adsorption effect in water, it can absorb various gases such as sulfur dioxide in the gas. These adsorbed substances can be dissolved in the treatment liquid due to the flushing of the treatment liquid, or react and neutralize with the treatment liquid, thereby playing the effect of cleaning and restoring the performance of the activated carbon. Moreover, in the application scenario of this embodiment, many problems in the existing application of activated carbon are overcome. For example, when the existing activated carbon is used in the airflow, it may burn when the airflow temperature is too high because there is no liquid wetting. When the activated carbon is statically immersed in water, there is no rotating flushing of the activated carbon disc in the treatment liquid. After a period of use, the activated carbon will absorb more impurities. Without the necessary cleaning, the performance of the activated carbon will quickly decline and need to be replaced. In the application of this embodiment, the above problems are overcome, so that the activated carbon can exert a long-lasting good adsorption performance.

[0056] The filter body 200 adopts a filter mesh, which can achieve the predetermined filtering effect, and is also conducive to the installation of the filter body 200 on the frame 201 and the flushing of the filter body 200; the curved surface structure of the filter body 200 can use centrifugal force to throw out solid impurities attached to the filter body 200, which is helpful for cleaning the filter body 200; and the use of a filter mesh is easy to equip, and has the characteristics of being suitable for flushing and cleaning and having high durability.

[0057] At the same time, in the cavity, along the flow direction of the gas, multiple filter components 2 can be sequentially arranged at intervals, and the pores of the filter body 200 on each filter component 2 are sequentially reduced from large to small. In this way, according to different conditions such as the composition of harmful substances in the gas, the size of dust particles, and the gas treatment effect required to be achieved, filter components 2 with various filtering functions can be set in a targeted manner to achieve step-by-step filtering and treatment, thereby improving the gas treatment performance and applicability of the gas treatment device. Figure 7 As shown, a filter component 2 can be set in the cavity near the air outlet 108, and the filter body 200 of the filter component 2 uses an activated carbon filter disc, which uses the good adsorption performance of activated carbon to further capture dust and some harmful gases in the smoke. In order to strengthen the firmness of the activated carbon filter disc, it can be reinforced by a frame 201 and a side plate with through holes.

[0058] like Figure 5 and Figure 6 As shown, for the specific structure of the filter component 2, in order to enhance its stability, a support frame 202 can be installed between the central component fixed on the rotating shaft 203 of the filter component 2 and the frame 201; wherein the frame 201 can be designed to be cylindrical, and the treatment liquid or solid objects thrown out by the filter body 200 are blocked and collected by the frame 201, and enter the treatment liquid with it; preferably, when a curved single-layer filter screen is used, the filter screen can also be installed on the side of the frame 201 facing the direction of the flue gas flow, so as to directly throw the solid impurities into the treatment liquid during centrifugation. In order to maintain the relative isolation effect on both sides of the filter component 2, a soft and wear-resistant sealing body 207 can be installed on the outside of the frame 201 to form a certain sealing between the frame 201 and the inner wall of the housing 1, for example, a rubber ring made of wear-resistant rubber, or a dense brush or a high-sealing bearing can be used. At the same time, a boss supporting the frame 201 can be constructed on both sides or the downstream side of the frame 201 and on the inner wall of the cavity to increase the stability of the filter component 2 when it is impacted by the airflow. An annular protrusion is provided on the inner wall surface of the cavity, which is arranged on both sides of each filter component 2, and a plurality of rolling elements are provided between the annular protrusion and the filter component 2. In terms of specific structure, a bracket is provided on the side of the annular protrusion facing the corresponding filter component 2, and the rolling element is a ball positioned and installed on the bracket. A slideway for the ball to slide is provided on the outer frame. Here, by providing the annular protrusion and the rolling element, the bearing capacity of the housing 1 on the filter component 2 can be increased. At the same time, the rolling friction is used to increase the stability and effectively reduce the friction of the filter component 2 during the rotation process, thereby reducing the wear during use.

[0059] In addition, if Figure 5 As shown, for the flue gas containing gas that needs to be supplemented with oxygen to easily react with the treatment liquid, an air supplement hole 109 can be added to the air inlet end side plate 101 for supplementing air.

[0060] like Figure 5 Combined with Figure 8As shown, the pretreatment unit described in this embodiment is provided with a material basket 140 in the cavity between the filter component 2 and the air outlet 108, and a filling port 120 facing the material basket 140 is opened at the upper part of the shell 1. The pretreatment unit also includes a stuffing box 143 that can be inserted into the material basket 140 through the filling port 120, and the material cavity 1430 of the stuffing box 143 is filled with stuffing that can improve the treatment performance of the treatment liquid. When inserted, the supporting flange 1431 of the stuffing box 143 is placed on the outer edge of the filling port 120, and the avoidance portion 1432 of the stuffing box 143 can avoid the rotating shaft 203. The through hole 1433 of the stuffing box 143 and the through hole 144 of the material basket 140 can realize the contact and conduction between the treatment liquid and the stuffing. A material basket 140 is arranged in the cavity, and fillers such as limestone and calcite are conveniently added through a filler box 143. With the slow dissolution of the filler, the alkalinity of the treatment liquid can be maintained, which is conducive to the neutralization reaction of sulfides, nitrogen oxides, etc. in the flue gas after they are dissolved in the treatment liquid, thereby continuously improving the treatment performance of the treatment liquid. The filler box 143 is arranged downstream of the filter component 2 to avoid pollution by smoke dust.

[0061] In addition, if Figure 5 As shown, the bottom of the shell 1 is constructed with a sedimentation tank 103 that is connected to the cavity and tilted downward against the flow of the flue gas; the sediment captured or generated by the treatment liquid slides to the end of the sedimentation tank 103 through the sedimentation tank 103, and is discharged into the waste storage bin 130 below the discharge port 133 through the discharge port 133 opened at the end; a waste discharge valve 134 is provided at the bottom of the waste storage bin 130. The sedimentation tank 103 is constructed at the bottom of the shell 1, which can accumulate and slide out the solid substances suspended or generated by the reaction and slowly settled in the treatment liquid, thereby improving the clarity of the treatment liquid. In order to better control the discharge of solid waste in the waste storage bin 130, a material position sensing device can be installed in the waste storage bin 130. When it is detected that the material is full of the waste storage bin 130, the waste discharge valve 134 is automatically controlled to discharge the waste material to better maintain the clarity of the treatment liquid.

[0062] like Figure 1 As shown, in the flue gas treatment device of this embodiment, the flue gas first enters the device through the flue gas inlet 601, passes through the packaging box surrounding the treatment material 300 in the heat exchange box 301, and realizes the temperature increase of the reprocessing unit 3. After that, the flue gas passes through the cooling heat exchanger 402 of the cooling unit 4, enters the pretreatment unit from the air inlet 106, and after being processed by the pretreatment unit, enters the reprocessing unit 3 through the reflux pipe 602. The reprocessing unit 3 receives the flue gas exhausted by the pretreatment unit. The flue gas is fully in contact with the treatment material 300 in the reprocessing unit 3 and is purified, and then discharged to the outside through the exhaust port 603. The flue gas flow path is shown in FIG. Figure 1The treatment material 300 filled in the reprocessing unit 3 can adsorb or catalyze the reaction of at least one gaseous pollutant in the flue gas flowing through, thereby purifying the flue gas.

[0063] For example, the reprocessing unit 3 uses a three-way catalytic converter, and the treatment material 300 is a purifier in the three-way catalytic converter; and the reprocessing unit 3 is set in the flow path of the flue gas upstream of the preprocessing unit, and the working temperature of the reprocessing unit 3 is increased by means of the heat in the flue gas, so that it can operate under the condition of 400-800°C for good catalytic reaction, thereby reacting carbon monoxide and nitrogen oxides in the flue gas to generate carbon dioxide and nitrogen, etc. The use of a three-way catalytic converter as the reprocessing unit 3 can effectively remove harmful gases such as carbon monoxide and nitrogen oxides in automobile exhaust, and the technology is mature and effective; and the temperature of the reprocessing unit 3 is increased by using the heat of the initial flue gas, so that the flue gas whose temperature drops after the preprocessing unit obtains a good catalytic reaction temperature condition, which helps to improve the treatment and purification effect of the reprocessing unit 3.

[0064] Another application form is that the reprocessing unit 3 is an activated carbon adsorption unit, and the processing material 300 is activated carbon. Using activated carbon for flue gas reprocessing can effectively adsorb oil gas and toxic gas in the flue gas, which is suitable for scenes such as oil fume purification in the catering industry where there are dense personnel and high purification requirements.

[0065] It should be noted that when the aftertreatment unit 3 adopts a three-way catalytic converter, an activated carbon treatment unit can also be installed at the exhaust port 603 or on the return pipe 602 to further improve the cleanliness of the exhaust gas of the device.

[0066] Based on the above system structure, a cooling unit 4 can also be set on the flue gas flow path upstream of the pre-treatment unit; the flue gas flowing through the outside of the re-treatment unit 3 is cooled by the cooling unit 4 and then enters the pre-treatment unit. After the flue gas flows through the outside of the re-treatment unit 3, it is cooled by the cooling unit 4 to a certain extent, and then enters the pre-treatment unit for pre-treatment, which can reduce the situation where the flue gas temperature is too high and easily causes partial gasification of the treatment liquid, and is conducive to the stability of the absorption treatment conditions inside the pre-treatment unit. Figure 1 As shown, a draft fan 604 may be installed on the flue gas flow path before and after the pre-treatment unit to overcome the resistance of various components and improve the flow performance of the flue gas.

[0067] Still Figure 1As shown, a liquid level detection device 502 that can monitor the treatment liquid in the cavity, and a pressure detection device 503 that can detect the pressure on both sides of the filter component 2 can be provided on the shell 1. When the liquid level detection device 502 is added to the shell 1, when the discharge port 133 discharges solid matter and takes away the liquid, causing the liquid level of the treatment liquid to drop, it can be replenished in real time through the filling port 120, thereby maintaining the liquid level of the treatment liquid and creating good conditions for the replacement or recycling of the treatment liquid; it is beneficial to maintain the treatment performance of the device; and the pressure detection device 503 can timely detect the differential pressure on both sides of the filter component 2, and timely detect the blockage of the filter body 200, which is beneficial to the operation and maintenance of the device. In addition, a temperature measuring device 501 can be set on the flue gas flow path before and after the pretreatment unit to detect the temperature of the flue gas, and reasonably adjust the speed of the cooling fan 401 of the cooling unit 4 according to the flue gas temperature, so that the flue gas temperature is within a temperature range that is convenient for treatment and purification. The cooling airflow path blown out by the cooling fan 401 is shown as follows. Figure 1 The route is shown in b.

[0068] When the flue gas treatment device described in this embodiment is in use, the flue gas is first pretreated by the pretreatment unit. The treatment liquid in the pretreatment unit can effectively absorb the smoke dust in the flue gas, and the gaseous pollutants that are easily soluble in the treatment liquid or react with the treatment liquid. Thereafter, the flue gas is further treated by the reprocessing unit 3 to form a good purification of the flue gas, which is beneficial to reduce the maintenance cost of the filter material or catalytic material in the flue gas treatment device and improve the processing operation stability of the device.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A flue gas treatment device for purifying flue gas, characterized in that include: A pretreatment unit, the pretreatment unit comprising a shell (1), and a treatment liquid contained in a cavity within the shell (1); A channel for the flue gas to flow through is formed in the cavity above the liquid level of the treatment liquid, and a water curtain formed by the treatment liquid is arranged in the channel; as the flue gas passes through the water curtain, the treatment liquid absorbs part of the pollutants in the flue gas; A reprocessing unit (3) receives and discharges the flue gas discharged from the preprocessing unit; The reprocessing unit (3) is filled with a processing material (300), and the processing material (300) can adsorb or catalyze a reaction of at least one gaseous pollutant in the flue gas flowing through, thereby purifying the flue gas; The reprocessing unit (3) is a three-way catalytic converter, and the treatment material (300) is a purifier in the three-way catalytic converter; or, the reprocessing unit (3) is an activated carbon adsorption unit, and the treatment material (300) is activated carbon; The reprocessing unit (3) is arranged in the flow passage of the flue gas upstream of the preprocessing unit, and can increase the operating temperature of the reprocessing unit (3) by means of the heat in the flue gas.

2. The flue gas treatment device according to claim 1, characterized in that: A cooling unit (4) is provided on the flow passage of the flue gas upstream of the pre-treatment unit; the flue gas flowing through the outside of the re-treatment unit (3) is cooled by the cooling unit (4) and then enters the pre-treatment unit.

3. The flue gas treatment device according to claim 1 or 2, characterized in that: An air inlet (106) and an air outlet (108) for the smoke to enter and exit the cavity are provided at both ends of the shell (1), and the pretreatment unit further comprises a filter component (2) separated between the air inlet (106) and the air outlet (108) and rotatably arranged in the cavity; the filter component (2) is partially flushed in the treatment liquid, and the portion of the filter component (2) soaked in the treatment liquid and located in the channel constitutes the water curtain.

4. The flue gas treatment device according to claim 3, characterized in that: The filter component (2) is a rotating body, and the cavity where the filter component (2) is located has a space for the filter component (2) to rotate in a sealed manner in the cavity.

5. The flue gas treatment device according to claim 4, characterized in that: The filter component (2) comprises a frame (201), and a thin-walled filter body (200) arranged in the frame (201); the filter body (200) is in the shape of a curved surface that is raised in the direction of flow of the smoke, and the filter body (200) is a filter screen that can intercept and filter smoke in the smoke.

6. The flue gas treatment device according to claim 5, characterized in that: A material holding basket (140) is arranged in the cavity between the filter component (2) and the air outlet (108), and a filling port (120) facing the material holding basket (140) is opened in the upper part of the shell (1), and the pretreatment unit also includes a stuffing box (143) that can be inserted into the material holding basket (140) through the filling port (120), and the stuffing box (143) is filled with a stuffing that can improve the treatment performance of the treatment liquid.

7. The flue gas treatment device according to claim 3, characterized in that: The bottom of the shell (1) is constructed with a sedimentation tank (103) which is connected to the cavity and inclined downward against the flow of the flue gas; the sediment captured or generated by the treatment liquid slides to the end of the sedimentation tank (103) through the sedimentation tank (103), and is discharged into a waste storage bin (130) arranged below the discharge port (133) through a discharge port (133) opened at the end; and a waste discharge valve (134) is arranged at the bottom of the waste storage bin (130).

8. The flue gas treatment device according to claim 3, characterized in that: The shell (1) is provided with a liquid level detection device (502) capable of monitoring the treatment liquid in the cavity, and a pressure detection device (503) capable of detecting the pressure on both sides of the filter component (2).

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