Exhaust gas filtration system

Abstract

Provision of exhaust gas filtration equipment. [Solution] The system includes an upstream rinsing unit 2 which communicates with a first rinsing space 210 for washing the exhaust gas to be treated and includes a vent pipe 23 for guiding and discharging the exhaust gas to be treated downstream; a reaction chamber 31 which defines a reaction space communicating with the vent pipe 23; a heater 32 installed in the reaction space having a high-temperature zone 321 and a low-temperature zone 322 with different temperatures; a reaction unit 3 which is connected to the vent pipe 23 and includes two diversion pipes 33 which extend to the high-temperature zone 321 and the low-temperature zone 322, respectively; a downstream rinsing unit 4 which communicates with the downstream side of the reaction unit 3 and washes the exhaust gas to be treated; an exhaust unit 5 for discharging the exhaust gas to be treated; and a dry air introduction unit 6 which is installed in the reaction unit 3 and introduces dry air to the high-temperature zone 321 and the low-temperature zone 322, respectively.

Description

Technical Field

[0001] The present invention relates to an exhaust gas filtration device, and particularly to an exhaust gas filtration device that utilizes a temperature difference to treat exhaust gas.

Background Art

[0002] Referring to FIG. 1, an existing exhaust gas treatment device 1 includes an inlet cleaning unit 11 communicating with a previous manufacturing facility (not shown), a reaction unit 12 installed downstream of the inlet cleaning unit 11 and communicating with the inlet cleaning unit 11, an outlet cleaning unit 13 installed downstream of the reaction unit 12 and communicating with the reaction unit 12, an exhaust unit 与14 communicating downstream of the outlet cleaning unit 13, and a tank 15 for collecting cleaning wastewater.

[0003] Inside the reaction unit 12, a heater causes harmful components such as NOx and NF3 contained in the exhaust gas to react at a high temperature, generating low-hazard components that can be discharged to the outside by the exhaust unit 14.

[0004] However, in order to match the amount of exhaust gas generated from the previous equipment, when the exhaust gas treatment device 1 attempts to treat a larger amount of gas, its scale becomes larger, and accordingly, the specifications of the heater also become larger.

[0005] In this case, since the heater adopts the principle of generating heat electrically, when the volume is large, it is inevitable that a temperature difference occurs between different parts.

[0006] Therefore, when gas is introduced from the inlet cleaning unit 11, taking N2O and NF3 contained therein as examples, at relatively low-temperature parts, N2O cannot be properly treated, while at relatively high-temperature parts, NF3, which can react appropriately at a lower temperature, instead reacts at an excessive temperature to generate harmful NO , ,

[0006] , , , x , components, and there is also a concern of wasting heating power.

Summary of the Invention

Problems to be Solved by the Invention

[0007] Therefore, the objective of this invention is to provide an exhaust gas filtration device that uses a temperature difference to process exhaust gas, thereby effectively improving processing efficiency by appropriately utilizing the temperature difference that naturally occurs. [Means for solving the problem]

[0008] This invention relates to an exhaust gas filtration device that uses a temperature difference to treat exhaust gas, and includes an upstream washing unit, a reaction unit, a downstream washing unit, an exhaust unit, and a dry air introduction unit. The upstream rinsing unit includes a first chamber that defines and communicates with a first rinsing space and has an inlet for introducing exhaust gas to be treated, a plurality of first rinsing nozzles installed in the first rinsing space, and a vent pipe that communicates with the first rinsing space and guides and discharges the exhaust gas to be treated downstream. The reaction unit is connected downstream of the upstream washing unit and includes a reaction chamber that defines a reaction space connected to the vent pipe, a heater installed within the reaction space having a high-temperature zone and a low-temperature zone with different temperatures, and two diversion pipes connected to the vent pipe and extending to the high-temperature zone and the low-temperature zone, respectively. The downstream rinsing unit is in communication with the downstream of the reaction unit and includes a second chamber that defines a second rinsing space, a connecting pipe that communicates the reaction space and the second rinsing space, and a plurality of second rinsing nozzles installed in the second rinsing space. The exhaust unit is installed downstream of the downstream washing unit and is for discharging the exhaust gas to be treated. The dry air introduction unit is installed in the reaction unit and includes an air supply pipe for introducing dry air, and two extension pipes connected downstream of the air supply pipe, extending to the high-temperature zone and the low-temperature zone, respectively, for introducing the dry air into the high-temperature zone and the low-temperature zone, respectively, to provide an exhaust gas filtration device. [Effects of the Invention]

[0009] The advantage of this invention lies in the fact that, due to the temperature difference inherently generated by the heater's heating principle, it is possible to select whether to introduce the exhaust gas to be treated from the front end into a high-temperature zone or a low-temperature zone by first cleaning it in an upstream water washing unit, and then introducing it through a branch pipe corresponding to the high-temperature zone or low-temperature zone for reaction. This not only ensures the expected reaction process by reacting at an appropriate temperature, but also reduces the possibility of nitrogen oxides, which are the target of treatment, being regenerated during the reaction process by additionally introducing dry air from these extension pipes into the high-temperature zone or low-temperature zone via a dry air introduction unit. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram illustrating a conventional exhaust gas treatment system. [Figure 2] This figure illustrates an example of an exhaust gas filtration device that uses temperature differences to treat exhaust gas according to the present invention. [Figure 3] This is a close-up view illustrating the reaction unit of the above embodiment. [Modes for carrying out the invention]

[0011] To more clearly explain the purpose, technical means, and advantages of the embodiments of the present invention, the technical means in the embodiments of the present invention will be clearly explained below in conjunction with the accompanying drawings of the embodiments of the present invention. It will be clear that the embodiments described are some, and not all, embodiments of the present invention. Typically, the components of the embodiments of the present invention depicted and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided below in the accompanying drawings does not constitute any limitation on the scope of protection of the present invention, but merely illustrates selected embodiments of the present invention.

[0012] Before describing this invention in more detail, it should be noted that, where appropriate, reference numerals or the end portion of reference numerals are repeated between figures to indicate corresponding or similar elements, and these may optionally have similar characteristics.

[0013] In the description of this invention, terms indicating directions and positional relationships such as "up," "down," "inside," "outside," "left," "right," "front," and "back" are based on the directions and positional relationships shown in the drawings, or the directions and positional relationships that are habitually used when using the product of this invention, for the purpose of simpler and clearer explanation. They do not teach or suggest that the corresponding devices or apparatus have a specific direction, structure, or operation in a specific direction, and are not limitations to this invention.

[0014] Furthermore, in this description of the present invention, terms such as "first," "second," etc., are used solely for the purpose of distinction and do not imply or suggest relative importance.

[0015] The present invention will be described in more detail by the following embodiments, but these embodiments are illustrative and should not be construed as limiting the implementation of the present invention.

[0016] An embodiment of the exhaust gas filtration device that uses the temperature difference of the present invention to treat exhaust gas is shown in Figure 2, and is suitable for treating the exhaust gas to be treated.

[0017] This embodiment includes an upstream water washing unit 2, a reaction unit 3 communicating with the downstream of the upstream water washing unit 2, a downstream water washing unit 4 communicating with the downstream of the reaction unit 3, an exhaust unit 5 installed downstream of the downstream water washing unit 4, a dry air introduction unit 6 installed in the reaction unit 3, and a tank 7 installed below the upstream water washing unit 2 and the downstream water washing unit 4 for receiving washing wastewater.

[0018] This embodiment is connected to a process facility (not shown) that discharges exhaust gas to be treated upstream, and the exhaust gas to be treated is described for the case where it contains at least similar components such as nitrous oxide (N2O) or ammonia (NH3).

[0019] The upstream water washing unit 2 includes a first chamber 21 that defines a first washing space 210 and has an inlet 211 suitable for introducing the exhaust gas to be treated and communicating with the first washing space 210, a plurality of first washing nozzles 22 installed in the first washing space 210, a ventilation pipe 23 that communicates with the first washing space 210 and guides and discharges the exhaust gas to be treated downstream, and an intermediate washing nozzle 24 installed on the ventilation pipe 23.

[0020] When the exhaust gas to be treated is introduced from the inlet 211 into the first washing space 210, the first washing nozzles 22 spray a washing liquid that can specifically be clean water, initially remove particles in the exhaust gas to be treated, and wash some components that are soluble in water. Further, when the exhaust gas to be treated is introduced into the ventilation pipe 23, washing can be continued by the intermediate washing nozzles 24.

[0021] [[ID=*16]] Referring to FIGS. 2 and 3 together, the reaction unit 3 includes a reaction chamber 31 that defines a reaction space 310 communicating with the ventilation pipe 23, a heater 32 installed in the reaction space 310 and having a high-temperature zone 321 and a low-temperature zone 322 with different temperatures, two shunt pipes 33 connected to the ventilation pipe 23 and extending to the high-temperature zone 321 and the low-temperature zone 322 respectively, and two on-off valves 34 installed on each shunt pipe 33 respectively.

[0022] Each on-off valve 34 is opened in this embodiment by an electric signal control method when it is necessary to introduce gas from the corresponding shunt pipe 33.

[0023] Specifically, the heater 32 employs an integrated electrothermal mechanism. Therefore, when the volume is of a certain scale, since the current is supplied from top to bottom in FIGS. 2 and 3, the high-temperature zone 321 with less current loss and higher temperature is located higher than the low-temperature zone 322 with more current loss and naturally lower temperature. That is, the temperature of the entire heater 32 continuously decreases from top to bottom. According to the specifications of this embodiment, the temperature of the high-temperature zone 321 exceeds 950°C and is below 1200°C, and the temperature of the low-temperature zone 322 is 700°C - 950°C.

[0024] The downflow water washing unit 4 includes a second chamber 41 that defines a second washing space 410, a communication pipe 42 that communicates with the reaction space 310 and the second washing space 410, and a plurality of second washing nozzles 43 installed in the second washing space 410.

[0025] These second washing nozzles 43 also spray a cleaning liquid, specifically clear water, thereby performing washing again on the exhaust gas of the processing target that has been reaction-processed in the reaction unit 3 before discharge, and ensuring that the fine particles and water-soluble components contained in the exhaust gas of the processing target are thoroughly washed and removed.

[0026] The cleaning liquid sprayed in the first washing space 210 and the second washing space 410 all flow to the downstream tank 7 and are recovered together. In the tank 7, after a certain amount of cleaning liquid is stored, it is discharged in a timely manner to prepare for the subsequent acceptance demand of the cleaning liquid.

[0027] The exhaust unit 5 is specifically an assembly composed of a pump capable of generating a suction force and a pipeline that communicates with the second washing space 410 and is suitable for guiding the exhaust gas of the processing target that has been processed and can be discharged to the outside.

[0028] The dry air introduction unit 6 includes an air supply pipe 61 for introducing dry air, an extension pipe 62 connected downstream of the air supply pipe 61 and extending to the high-temperature zone 321 and the low-temperature zone 322, respectively, and a three-way valve 63 installed between the air supply pipe 61 and the extension pipe 62.

[0029] The two extension pipes 62 are used to introduce dry air into the high-temperature zone 321 and the low-temperature zone 322, respectively. The three-way valve 63 controls the subsequent flow path of the dry air introduced from the supply pipe 61 and opens the passages corresponding to the extension pipes 62, thereby controlling the introduction of dry air into either the high-temperature zone 321 or the low-temperature zone 322.

[0030] Specifically, taking the case where the exhaust gas to be treated contains nitrous oxide (N2O), nitrous oxide reacts at a temperature of 1050°C and is suitable for decomposing into more harmless nitrogen and oxygen. Therefore, by opening the on-off valve 34 in the flow divider pipe 33 corresponding to the high-temperature zone 321 and directly introducing the exhaust gas to be treated, which has passed through the first rinsing space 210, to a position close to the high-temperature zone 321 of the heater 32, the expected decomposition reaction can be more easily generated.

[0031] On the other hand, if the component of the exhaust gas to be treated is ammonia (NH3), it is suitable to react it with nitrogen and water at a temperature of 800°C along with the introduction of an oxidizing agent. Therefore, by opening the on-off valve 34 in the flow divider pipe 33 corresponding to the low-temperature zone 322 and directly introducing the exhaust gas to be treated that has passed through the first rinsing space 210 to a position close to the low-temperature zone 322 of the heater 32, the expected oxidation reaction can be more easily generated.

[0032] Specifically, the flow rate of dry air introduced from the air supply pipe 61 of the dry air introduction unit 6 can be accurately calculated using a flow meter, and in this embodiment, it is between 40 liters per minute and 100 liters per minute.

[0033] In either the high-temperature zone 321 or the low-temperature zone 322 reaction, dry air can be introduced through the corresponding extension tube 62, fundamentally reducing the generation of nitrogen oxides.

[0034] This not only allows the reaction to be accelerated by nitrogen and oxygen in the air, but also, by combining it with the temperature difference phenomenon that is naturally generated by the heater 32, the objectives of optimizing reaction efficiency and reducing unnecessary energy consumption can be achieved.

[0035] Finally, the exhaust gas to be treated has already undergone two stages of scrubbing relatively upstream, and in reaction unit 3, depending on the composition of the exhaust gas, it is selected to be introduced into either the high-temperature zone 321 or the low-temperature zone 322 from a specific diversion pipe 33. Together with the dry air introduced from these extension pipes 62, the reaction efficiency is optimized at an appropriate temperature. Thus, harmful nitrogen oxides (NOx) are removed after treatment. x The exhaust gas that has been treated and has no longer contained can be directly discharged by the exhaust unit 5.

[0036] As described above, in the embodiment of the exhaust gas filtration device of the present invention that uses temperature differences to treat exhaust gas, the exhaust gas is initially washed in the upstream washing unit 2 by the temperature difference phenomenon of the heater 32. Based on the differences in components, it can be selected to be introduced from the corresponding high-temperature zone 321 or low-temperature zone 322 via the branch pipe 33, and together with the dry air introduced from the extension pipe 62, a more appropriate temperature and more efficient reaction can be carried out. This ensures that the reaction process is carried out as expected, reduces unnecessary energy consumption, and fundamentally reduces the possibility of nitrogen oxides being generated again. Therefore, the objective of the present invention can be reliably achieved.

[0037] While the present invention has been described in relation to what may be considered exemplary embodiments, it is understood that the present invention is not limited to the disclosed embodiments, but is intended to cover a variety of configurations that fall within the broadest spirit and scope of interpretation to encompass all such modifications and equivalent configurations. [Industrial applicability]

[0038] The exhaust gas filtration device of this invention can be used for treating exhaust gas. [Explanation of Symbols]

[0039] 2 Upstream flushing unit 21 First Chamber 210 First rinsing space 211 Inlet 22 First rinse nozzle 23. Vent 24 Intermediate rinsing nozzle 3 Reaction Units 31 Reaction Chamber 310 Reaction space 32 Heater 321 High Temperature Zone 322 Low Temperature Zone 33 Flow pipe 34. Shut-off valves 4 Downstream flushing unit 41 Second Chamber 410 Second rinsing space 42 Communication pipe 43. Second rinse nozzle 5. Exhaust Unit 6. Dry air introduction unit 61 Air supply pipe 62 Stretched pipe 63 Three-way valve 7 tanks

Claims

1. An exhaust gas filtration system that uses a temperature difference to treat exhaust gas, comprising an upstream washing unit, a reaction unit, a downstream washing unit, an exhaust unit, and a dry air introduction unit, The upstream rinsing unit includes a first chamber that defines and communicates with a first rinsing space and has an inlet for introducing exhaust gas to be treated, a plurality of first rinsing nozzles installed in the first rinsing space, and a vent pipe that communicates with the first rinsing space and guides and discharges the exhaust gas to be treated downstream. The reaction unit is connected downstream of the upstream washing unit and includes a reaction chamber that defines a reaction space communicating with the vent pipe, a heater installed within the reaction space having a high-temperature zone and a low-temperature zone with different temperatures, and two diversion pipes connected to the vent pipe and extending to the high-temperature zone and the low-temperature zone, respectively. The downstream rinsing unit is in communication with the downstream of the reaction unit and includes a second chamber that defines a second rinsing space, a connecting pipe that communicates the reaction space and the second rinsing space, and a plurality of second rinsing nozzles installed in the second rinsing space. The exhaust unit is installed downstream of the downstream washing unit and is for discharging the exhaust gas to be treated. The dry air introduction unit is installed in the reaction unit and includes an air supply pipe for introducing dry air, and two extension pipes connected downstream of the air supply pipe, extending to the high-temperature zone and the low-temperature zone, respectively, for introducing the dry air into the high-temperature zone and the low-temperature zone, respectively, in an exhaust gas filtration device.

2. The exhaust gas filtration apparatus according to claim 1, wherein the high-temperature zone of the heater of the reaction unit is located at a higher position than the low-temperature zone.

3. The exhaust gas filtration apparatus according to claim 1, wherein the dry air introduction unit further includes a three-way valve installed between the air supply pipe and the two extension pipes.

4. The exhaust gas filtration apparatus according to any one of claims 1 to 3, wherein the reaction unit further includes two on-off valves installed in each of the flow dividers.

5. The exhaust gas filtration apparatus according to claim 1, wherein the upstream rinsing unit further includes at least one intermediate rinsing nozzle installed in the vent pipe.

6. The exhaust gas filtration apparatus according to claim 1, further comprising a tank installed below the upstream and downstream washing units for receiving washing wastewater.

7. The exhaust gas filtration apparatus according to claim 1, wherein the temperature of the high-temperature zone of the heater of the reaction unit is greater than 950°C and less than or equal to 1200°C, and the temperature of the low-temperature zone of the heater of the reaction unit is between 700°C and 950°C.

8. The exhaust gas filtration apparatus according to claim 1, wherein the flow rate of the dry air introduced from the air supply pipe of the dry air introduction unit is 40 liters per minute to 100 liters per minute.

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