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 discharging the exhaust gas to be treated; a reaction unit 3 which is installed in a reaction space communicating with the vent pipe 23 and includes a heater 32 having a high-temperature zone 321 and a low-temperature zone 322 with different temperatures, and two diversion pipes 33 which are connected to the vent pipe 23 and extend to the high-temperature zone 321 and the low-temperature zone 322, respectively; an auxiliary unit 5 which is installed in the upstream rinsing unit 2, the reaction unit 3 and the downstream rinsing unit 4 and includes at least one injection port 51 for introducing an oxidation-reduction agent into at least one of the reaction space and the communicating pipe 42; a downstream rinsing unit 4 which communicates downstream of the reaction unit 3 and washes the exhaust gas to be treated; and an exhaust unit 6 for removing the exhaust gas to be treated.

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 front-stage 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 14 communicating downstream of the outlet cleaning unit 13, and a tank 15 for collecting cleaning wastewater.

[0003] In the reaction unit 12, harmful components such as NO , , x , , , ,

[0006] , , NF3, etc. are reacted at a high temperature to generate low-hazard components that can be discharged to the outside by the exhaust unit 14.

[0004] <00000l8>However, in order to match the amount of exhaust gas generated from the front-stage 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, N2O cannot be properly treated at relatively low-temperature parts, 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 x components, and there is also a concern of wasting heating power.

Summary of 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 is 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 auxiliary unit, and an exhaust 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 auxiliary unit is installed in the upstream washing unit, the reaction unit, and the downstream washing unit, and is in communication with at least one of the reaction space and the connecting pipe, and includes at least one injection port for introducing an oxidation-reduction agent. The present invention provides an exhaust gas filtration system in which the exhaust unit is installed downstream of the downstream washing unit and is for removing the exhaust gas to be treated. [Effects of the Invention]

[0009] The advantage of this invention lies in the fact that, based on the type of exhaust gas to be treated introduced from the front end, the temperature difference generated by the heater's heating principle allows for the selection of a reaction process where the exhaust gas is initially washed in an upstream water washing unit, and then introduced through a branch pipe corresponding to a high-temperature or low-temperature zone. This ensures that the reaction process is carried out at an appropriate temperature, guaranteeing the expected outcome. Furthermore, based on the requirement that specific components require treatment by oxidation-reduction reactions, these injection ports can be positioned appropriately to inject the corresponding oxidation-reduction agents, thereby ensuring precise and efficient reaction processing and reliably optimizing the treatment performance against nitrogen oxides. [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 washing unit 2, a reaction unit 3 communicating downstream of the upstream washing unit 2, a downstream washing unit 4 communicating downstream of the reaction unit 3, an auxiliary unit 5, an exhaust unit 6 installed downstream of the downstream washing unit 4, and a tank 7 installed below the upstream washing unit 2 and the downstream washing unit 4 for receiving washing wastewater.

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

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

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

[0021] 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 electric heating mechanism, and therefore, when the volume is of a certain size, the current is supplied from top to bottom in Figures 2 and 3. As a result, the high-temperature zone 321, where current loss is low and the temperature is high, is located higher than the low-temperature zone 322, where current loss is high and the temperature naturally becomes low. That is, the temperature of the entire heater 32 decreases continuously from top to bottom, and according to the specifications of this embodiment, the temperature of the high-temperature zone 321 is above 950°C and below 1200°C, while the temperature of the low-temperature zone 322 is between 700°C and 950°C.

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

[0025] These second rinsing nozzles 43 also spray a cleaning solution, specifically clean water, thereby cleaning the exhaust gas that has been treated in the reaction unit 3 before discharge, ensuring that particulate matter and water-soluble components contained in the exhaust gas are thoroughly cleaned and removed.

[0026] The cleaning solution sprayed in the first rinsing space 210 and the second rinsing space 410 all flow to the downstream tank 7 and are collected together. After a certain amount of cleaning solution is stored in tank 7, it is discharged as needed to prepare for the subsequent demand for receiving cleaning solution.

[0027] Auxiliary unit 5 is installed in the upstream rinsing unit 2, reaction unit 3, and downstream rinsing unit 4. Auxiliary unit 5 is also connected to the vent pipe 23, reaction space 310, second rinsing space 410, and connecting pipe 42, respectively, and includes multiple injection ports 51 for introducing oxidation-reduction agents.

[0028] The redox agent can be gaseous ozone (O3), carbon monoxide (CO), or ammonia (NH3), or liquid hydrogen peroxide (H2O2) or bleach (NaClO), and can be selected according to the exhaust gas components to be treated, the reaction carried out by heating of reaction unit 3, or the treatment needs at different locations.

[0029] 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, the exhaust gas to be treated, which has passed through the first rinsing space 210, can be directly introduced to a position close to the high-temperature zone 321 of the heater 32.

[0030] Then, in conjunction with the injection port 51 installed in the reaction space 310, carbon monoxide is introduced as a reducing agent to help reduce nitrous oxide to nitrogen and oxygen, thereby promoting the generation of the expected decomposition reaction.

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

[0032] Then, through the injection port 51 provided in the reaction space 310, ozone gas, which is useful for the oxidation reaction of ammonia, is introduced as an oxidizing agent to promote the generation of the expected oxidation reaction.

[0033] In addition to the reaction space 310, the other injection ports 51 located in the vent pipe 23, the second rinsing space 410, and the connecting pipe 42 can meet the needs for preliminary reaction at the front end of the reaction unit 3 or complete treatment at the rear end.

[0034] This provides more treatment options based on the different characteristics of the exhaust gas to be treated, and further ensures that the exhaust gas to be treated can reliably and completely complete the oxidation-reduction reactions required for treatment in this embodiment, thereby optimizing the versatility of the types of exhaust gas to be treated and the flexibility of operation.

[0035] Specifically, the exhaust unit 6 is an assembly comprising a pump capable of generating suction force and a pipeline that communicates with the second rinsing space 410 and is suitable for guiding the treated exhaust gas, which is ready for discharge, to the outside.

[0036] The exhaust gas to be treated has already undergone two stages of cleaning 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, and together with the oxidation-reduction agent introduced from the injection port 51, it is ensured that harmful substances are reacted into relatively harmless substances. Thus, harmful nitrogen oxides (NOx) are treated. x The exhaust gas that has been treated and has no remaining residue can be directly discharged by the exhaust unit 6.

[0037] As described above, in this embodiment of the exhaust gas filtration device that uses temperature differences to treat exhaust gas, the temperature difference phenomenon of the heater 32 allows for initial cleaning by the upstream washing unit 2, and then, based on the differences in components, selection is made to introduce the gas from the corresponding high-temperature zone 321 or low-temperature zone 322 via the flow divider 33. By introducing the redox agent to the appropriate position using these injection ports 51, accurate and efficient reaction processing is ensured, and the treatment efficiency for nitrogen oxides can be reliably optimized. Therefore, the objective of this invention can be reliably achieved.

[0038] 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]

[0039] The exhaust gas filtration device of this invention can be used for treating exhaust gas. [Explanation of Symbols]

[0040] 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 Auxiliary Units 51 Injection port 6 Exhaust Unit 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 auxiliary unit, and an exhaust 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 auxiliary unit is installed in the upstream washing unit, the reaction unit, and the downstream washing unit, and is in communication with at least one of the reaction space and the connecting pipe, and includes at least one injection port for introducing an oxidation-reduction agent. An exhaust gas filtration device wherein the exhaust unit is installed downstream of the downstream washing unit and is for removing the exhaust gas to be treated.

2. The exhaust gas filtration apparatus according to claim 1, wherein the auxiliary unit further includes the injection port communicating with the vent pipe.

3. The exhaust gas filtration apparatus according to claim 1, wherein the auxiliary unit further includes the injection port communicating with the second rinsing space.

4. 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.

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

6. 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.

7. 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.

8. 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 1200°C or less, and the temperature of the low-temperature zone of the heater of the reaction unit is between 700°C and 950°C.

9. The exhaust gas filtration apparatus according to any one of claims 1 to 3, wherein the oxidation-reduction agent introduced from the injection port is selected from ozone, ammonia, carbon monoxide, hydrogen peroxide, or bleach.

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