A low-nitrogen ammonia-rich exhaust gas spraying treatment device

Abstract

The utility model discloses a kind of low-nitrogen ammonia-rich waste gas spray treatment devices, belong to stationary source waste gas purification technical field, its technical scheme main point includes controller and dust removal catalytic component, the right side of dust removal catalytic component is connected with spray tower one, the top of spray tower one is connected with connecting pipe, the right side of spray tower one is provided with spray tower two, the combination structure of dust removal catalytic component, spray tower one and spray tower two is set in the application, first dust removal catalytic component removes dust impurities in waste gas and realizes nitrogen oxide catalytic conversion using waste gas itself reducing agent, then through two-stage spray tower cooperation extension filter structure, the contact time of waste gas and spray liquid is extended, let remaining ammonia be more fully purified, effectively solve the problem that single processing structure cannot be managed two kinds of pollutants in coordination, meet the pollutant emission standard requirement, while through the monitoring of temperature to reaction environmental parameter, the stability of processing process is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of stationary source exhaust gas purification technology, and in particular to a low-nitrogen, high-ammonia exhaust gas spray treatment device. Background Technology

[0002] In industrial production processes, ammonia-rich, low-NOx exhaust gases are emitted from ammonia-rich internal combustion engines, ammonia burners, and new cement processes. These exhaust gases are typically accompanied by high humidity and dust content. Traditional SCR denitrification systems require the addition of a reducing agent, which not only makes the device structure more complex and increases operating costs, but also poses a risk of ammonia escape, easily causing secondary pollution. Ammonia-rich exhaust gases themselves contain excess reducing agent, and theoretically, nitrogen oxides can be removed through SCR reactions. At the same time, current relevant air pollutant emission standards and special emission limits for key areas have imposed strict requirements on the emission of nitrogen oxides and ammonia. Existing exhaust gas treatment devices disclosed in some patents are no longer suitable for actual treatment needs.

[0003] However, existing methods for treating ammonia-rich, low-NOx waste gas have several drawbacks. First, it is difficult to achieve efficient removal of NOx while simultaneously purifying the remaining ammonia after the reaction. A single treatment structure cannot meet the need for synergistic treatment of both pollutants. Second, during the spray treatment process, there is a lack of effective monitoring and control of the spray liquid state, which can easily lead to a decrease in treatment efficiency due to imbalances in spray liquid parameters. Furthermore, poor connection between the spray system and the recovery structure can result in resource waste or secondary pollution. Third, dust impurities in the waste gas can easily affect the catalytic components, reducing the catalytic reaction effect. At the same time, the lack of monitoring of key environmental parameters of the reaction makes it difficult to ensure the stability of the treatment process.

[0004] Therefore, a low-nitrogen, high-ammonia waste gas spray treatment device is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a low-nitrogen, high-ammonia waste gas spray treatment device, which can solve the following problems in the treatment of low-nitrogen oxide, high-ammonia waste gas: First, it is difficult to achieve efficient removal of nitrogen oxides while thoroughly purifying the remaining ammonia after the reaction, and a single treatment structure cannot meet the needs of synergistic treatment of the two pollutants. Second, during the spray treatment process, there is a lack of effective monitoring and control of the spray liquid state, which easily leads to a decrease in treatment efficiency due to imbalance of spray liquid parameters. In addition, the poor connection between the spray system and the recovery structure causes resource waste or secondary pollution. Third, dust impurities in the waste gas can easily affect the catalytic components and reduce the catalytic reaction effect. At the same time, the lack of monitoring of key environmental parameters of the reaction makes it difficult to ensure the stability of the treatment process.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-nitrogen, ammonia-rich waste gas scrubbing treatment device, comprising a controller and a dust removal catalytic component, wherein a first scrubbing tower is connected to the right side of the dust removal catalytic component, a connecting pipe is connected to the top of the first scrubbing tower, a second scrubbing tower is provided to the right side of the first scrubbing tower, and the left side of the second scrubbing tower is connected to the right side of the connecting pipe. Both the first and second scrubbing towers are provided with a filtration structure inside, and a liquid supply recovery component is provided on the outside of the first and second scrubbing towers. The liquid supply and recovery assembly includes a circulation pump located behind spray tower 1 and spray tower 2. The suction end of the circulation pump is connected to the rear of spray tower 1 and spray tower 2 respectively. The output end of the circulation pump is connected to a circulation valve and a recovery valve respectively. The top of the circulation valve is connected to a conduit. Spray rings are installed inside spray tower 1 and spray tower 2. The spray rings are connected to the conduit. A liquid level sensor and a pH sensor are installed on the right side of spray tower 1 and spray tower 2 respectively. The sensing ends of the liquid level sensor and pH sensor are located inside spray tower 1 and spray tower 2. A wastewater collection tank is connected to the rear of the recovery valve through a pipe. An external replenishment valve is connected to the left side of spray tower 1 and spray tower 2.

[0007] Preferably, the dust removal catalytic component includes a V-SCR catalytic shell connected to the left side of the spray tower, and the interior of the V-SCR catalytic shell is provided with a cordierite honeycomb carrier.

[0008] Preferably, the left side of the V-SCR catalyst shell is connected to a dust removal shell, and a dust filter screen is provided inside the dust removal shell.

[0009] Preferably, a temperature sensor is provided at the bottom of the dust collector housing, and the sensing end of the temperature sensor is located inside the dust collector housing.

[0010] Preferably, the extended filtration structure includes a lower grid plate fixedly connected inside spray tower one and spray tower two, and the top of the lower grid plate is filled with PP multi-faceted hollow sphere packing.

[0011] Preferably, the top of the PP multifaceted hollow sphere packing is provided with an upper grid plate, which is located at the bottom of the spray ring. Both the first and second spray towers are provided with folded wire mesh demisters on their top sides, which are located at the top of the spray ring.

[0012] Preferably, the top of the second spray tower is connected to an exhaust pipe, which is connected to an exhaust pipe to the atmosphere or subsequent treatment equipment.

[0013] Preferably, a second liquid level sensor is provided on the right side of the wastewater collection tank, and the sensing end of the second liquid level sensor is located inside the wastewater collection tank. A drain valve is connected to the rear side of the wastewater collection tank, and the drain valve is connected to the wastewater treatment station in the plant area through a pipeline.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This application adopts a combined structure of dust removal catalytic component, spray tower one and spray tower two. First, the dust removal catalytic component removes dust impurities from the exhaust gas and uses the exhaust gas itself as a reducing agent to achieve the catalytic conversion of nitrogen oxides. Then, the two-stage spray towers combined with the extended filtration structure extend the contact time between the exhaust gas and the spray liquid, allowing the remaining ammonia to be more fully purified. This effectively solves the problem that a single treatment structure cannot synergistically treat two pollutants, meets the pollutant emission standards, and ensures the stability of the treatment process by monitoring the temperature to reflect environmental parameters. 2. This application, by setting up a liquid supply and recovery component, utilizes a liquid level sensor and a pH sensor to monitor the spray liquid status in real time. In conjunction with a circulation pump, circulation valve, recovery valve, and external replenishment valve, it achieves the recycling, precise control, and timely replenishment of the spray liquid, avoiding the decrease in treatment efficiency due to imbalance of spray liquid parameters. Furthermore, the waste spray liquid is centrally recovered through a wastewater collection tank, solving the problems of resource waste and secondary pollution caused by poor connection between the spray system and the recovery structure. The setting of the extended filtration structure further improves the effect of spray treatment, making ammonia removal more thorough. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the low-nitrogen, ammonia-rich waste gas spray treatment device of this utility model. Figure 2 This is a structural diagram of spray tower one and spray tower two of this utility model; Figure 3 This is a structural diagram of the dust removal catalytic component of this utility model; Figure 4 This is a structural diagram of the liquid supply and recovery assembly of this utility model; Figure 5 This is a structural diagram of the extended filtration structure of this utility model.

[0016] In the diagram, 1. Controller; 2. Dust removal catalytic assembly; 201. V-SCR catalytic shell; 202. Cordierite honeycomb carrier; 203. Dust removal shell; 204. Dust filter screen; 205. Temperature sensor; 3. Spray tower one; 4. Connecting pipe; 5. Spray tower two; 6. Extended filtration structure; 601. Lower grid plate; 602. PP multi-faceted hollow ball packing; 603. Upper grid plate; 604. Folded wire mesh demister; 7. Liquid supply and recovery assembly; 701. Circulation pump; 702. Circulation valve; 703. Recovery valve; 704. Conduit; 705. Spray ring; 706. Liquid level sensor one; 707. pH sensor; 708. Wastewater collection tank; 709. External replenishment valve; 8. Gas outlet pipe; 9. Liquid level sensor two; 10. Drain valve. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figure 1-5 The present invention provides the following technical solution: A low-nitrogen, ammonia-rich waste gas scrubbing treatment device includes a controller 1 and a dust removal catalyst component 2. The right side of the dust removal catalyst component 2 is connected to a first scrubbing tower 3, the top of the first scrubbing tower 3 is connected to a connecting pipe 4, a second scrubbing tower 5 is provided on the right side of the first scrubbing tower 3, and the left side of the second scrubbing tower 5 is connected to the right side of the connecting pipe 4. Both the first scrubbing tower 3 and the second scrubbing tower 5 are equipped with a filter extension structure 6, and a liquid supply recovery component 7 is provided on the outside of the first scrubbing tower 3 and the second scrubbing tower 5. The liquid supply and recovery assembly 7 includes a circulation pump 701 located behind spray tower 3 and spray tower 5. The suction end of the circulation pump 701 is connected to the rear of spray tower 3 and spray tower 5, respectively. The output end of the circulation pump 701 is connected to a circulation valve 702 and a recovery valve 703, respectively. The top of the circulation valve 702 is connected to a conduit 704. A spray ring 705 is installed inside spray tower 3 and spray tower 5, and the spray ring 705 is connected to the conduit 704. A liquid level sensor 706 and a pH sensor 707 are installed on the right side of spray tower 3 and spray tower 5, respectively. The sensing ends of the liquid level sensor 706 and pH sensor 707 are located inside spray tower 3 and spray tower 5, respectively. The rear of the recovery valve 703 is connected to a wastewater collection tank 708 through a pipe. An external replenishment valve 709 is connected to the left side of spray tower 3 and spray tower 5, respectively.

[0019] In this embodiment: by setting up a controller 1, a dust removal catalytic component 2, a first spray tower 3, a second spray tower 5, a filtration structure 6, and a liquid supply and recovery component 7, the exhaust gas first enters the dust removal catalytic component 2 for pretreatment, removing dust impurities while completing the catalytic conversion of nitrogen oxides. Then, the exhaust gas enters the first spray tower 3. The circulation pump 701 in the liquid supply and recovery component 7 extracts the spray liquid from the first spray tower 3 and delivers it to the spray ring 705 via the circulation valve 702 and conduit 704. The spray ring 705 sprays the spray liquid into the tower. The exhaust gas and the spray liquid fully contact under the action of the filtration structure 6, initially removing ammonia from the exhaust gas. Then, the exhaust gas enters the second spray tower 5 through the connecting pipe 4, repeating the above spraying process. The filtration structure 6 further... Extending the contact time between exhaust gas and spray liquid achieves deep purification of ammonia. During this process, liquid level sensor 706 monitors the liquid level in spray tower 3 and spray tower 5 in real time, and pH sensor 707 monitors the pH value of the spray liquid. The relevant data are synchronously transmitted to controller 1. Controller 1 controls the external replenishment valve 709 to replenish the spray liquid in a timely manner based on the monitoring data. When the parameters of the spray liquid do not meet the treatment requirements, controller 1 controls the recovery valve 703 to open, and transports the waste spray liquid through the pipeline to the wastewater collection tank 708 for centralized treatment. At the same time, it controls the circulation pump 701 and circulation valve 702 to work together to ensure the stable operation of the spray system, and finally achieves the synergistic and efficient removal of nitrogen oxides and ammonia, meeting the environmental protection emission requirements.

[0020] Specifically, such as Figure 3 As shown, the dust removal catalyst assembly 2 includes a V-SCR catalyst shell 201 connected to the left side of the spray tower 3, and a cordierite honeycomb carrier 202 is disposed inside the V-SCR catalyst shell 201.

[0021] Specifically, such as Figure 3 As shown, a dust removal shell 203 is connected to the left side of the V-SCR catalyst shell 201, and a dust filter 204 is installed inside the dust removal shell 203.

[0022] Specifically, such as Figure 3 As shown, a temperature sensor 205 is provided at the bottom of the dust collector housing 203, and the sensing end of the temperature sensor 205 is located inside the dust collector housing 203.

[0023] In this embodiment: by setting up the dust removal catalytic component 2, the exhaust gas first enters the dust removal shell 203. The dust filter 204 inside the dust removal shell 203 intercepts dust impurities in the exhaust gas, preventing dust adhesion from affecting the subsequent catalytic reaction effect. After dust removal, the exhaust gas enters the V-SCR catalytic shell 201. The cordierite honeycomb carrier 202 inside the V-SCR catalytic shell 201 provides a reaction site for the catalytic conversion of nitrogen oxides. The reducing agent contained in the exhaust gas itself is used to achieve efficient conversion of nitrogen oxides. At the same time, the temperature sensor 205 at the bottom of the dust removal shell 203 monitors the exhaust gas temperature in real time and transmits the temperature data to the controller 1 to ensure that the catalytic reaction proceeds stably under suitable temperature conditions, laying a good foundation for the subsequent spray ammonia removal process.

[0024] Specifically, such as Figure 5 As shown, the extended filtration structure 6 includes a lower grid plate 601 fixedly connected inside the spray tower 3 and the spray tower 5, and the top of the lower grid plate 601 is filled with PP multi-faceted hollow ball packing 602.

[0025] Specifically, such as Figure 5 As shown, the top of the PP multifaceted hollow sphere packing 602 is provided with an upper grid plate 603, which is located at the bottom of the spray ring 705. The top side of the spray tower 1 3 and spray tower 2 5 are both provided with a folded wire mesh demister 604, which is located at the top of the spray ring 705.

[0026] In this embodiment: by setting the extended filtration structure 6, the lower grid plate 601 and the upper grid plate 603 play the role of fixing and supporting the PP multifaceted hollow sphere packing 602, so that the packing can be stably filled inside the spray tower 1 3 and the spray tower 2 5. When the spray ring 705 sprays the spray liquid, the exhaust gas flows from bottom to top. The PP multifaceted hollow sphere packing 602 will disrupt the flow trajectory of the exhaust gas and the spray liquid, prolonging the contact time and contact area between the two, so that the ammonia in the exhaust gas can fully react with the spray liquid, improving the ammonia removal effect. The folded plate wire mesh demister 604 located at the top of the spray ring 705 will intercept the droplets generated during the spraying process, preventing the droplets from being discharged with the purified exhaust gas, and ensuring the exhaust quality.

[0027] Specifically, such as Figure 5 As shown, the top of the spray tower 2 5 is connected to an exhaust pipe 8, which is connected to an exhaust pipe to the atmosphere or subsequent treatment equipment.

[0028] Specifically, such as Figure 4 As shown, a level sensor 2 9 is installed on the right side of the wastewater collection tank 708. The sensing end of the level sensor 2 9 is located inside the wastewater collection tank 708. A drain valve 10 is connected to the rear side of the wastewater collection tank 708. The drain valve 10 is connected to the wastewater treatment station in the factory area through a pipeline.

[0029] In this embodiment: by setting up an exhaust pipe 8, a level sensor 2 9, and a drain valve 10, the exhaust gas that has undergone deep purification in the spray tower 2 5 will enter the external exhaust pipe through the exhaust pipe 8 and eventually be discharged into the atmosphere or transported to subsequent treatment equipment. The level sensor 2 9 on the right side of the wastewater collection tank 708 will monitor the level of the waste spray liquid collected in the tank in real time. When the level reaches the set value, it will transmit a signal to the controller 1. The controller 1 controls the drain valve 10 to open, so that the wastewater in the tank can be transported through the pipeline to the plant's sewage treatment station for centralized treatment, avoiding wastewater accumulation and secondary pollution, and ensuring that the wastewater discharge of the entire treatment system is compliant and orderly.

[0030] Working Principle: During the operation of the low-NOx, high-ammonia waste gas treatment device, the waste gas first enters the dust removal shell 203 in the dust removal catalytic component 2. The dust filter 204 inside the dust removal shell 203 intercepts dust impurities in the waste gas, preventing dust from affecting subsequent reactions. At the same time, the temperature sensor 205 at the bottom of the dust removal shell 203 monitors the waste gas temperature in real time and transmits the data to the controller 1. The waste gas after dust removal then enters the V-SCR catalytic shell 201. The cordierite honeycomb carrier 202 inside the shell provides a reaction site, utilizing the reducing agent contained in the waste gas to efficiently convert nitrogen oxides, ensuring the catalytic reaction is stable under the appropriate conditions fed back by the temperature sensor 205. The pretreated waste gas enters the spray tower 3 through a pipeline. The circulation pump 701 in the liquid recovery assembly 7 extracts the spray liquid from the spray tower 3 and delivers it to the spray ring 705 via the circulation valve 702 and the conduit 704. The spray ring 705 evenly sprays the spray liquid into the tower. At this time, the waste gas flows from bottom to top. In the extended filtration structure 6 inside the spray tower 3, the lower grid plate 601 and the upper grid plate 603 fix and support the PP multi-faceted hollow spherical packing 602. The packing disrupts the flow trajectory of the waste gas and the spray liquid, prolonging the contact time and area between the two, allowing the ammonia in the waste gas to fully react with the spray liquid, achieving preliminary ammonia removal. The folded wire mesh at the top of the spray ring 705 removes... The misting device 604 intercepts the droplets generated by the spraying process, preventing them from being discharged with the exhaust gas. The preliminarily purified exhaust gas enters the second spray tower 5 through the connecting pipe 4, repeating the spraying and ammonia removal process of the first spray tower 3. The extended filter structure 6 inside the second spray tower 5 further enhances the ammonia removal effect, completing deep purification. During this process, the level sensor 706 on the right side of the first and second spray towers 3 and 5 monitors the liquid level of the spraying liquid in real time, and the pH sensor 707 monitors the pH value of the spraying liquid. These data are synchronously transmitted to the controller 1. The controller 1 controls the external replenishment valve 709 to replenish the spraying liquid in a timely manner based on the monitoring data. When the parameters of the spraying liquid do not meet the treatment requirements, the controller 1 controls... When the recovery valve 703 is opened, the waste spray liquid is transported through the pipeline to the wastewater collection tank 708. The level sensor 29 on the right side of the wastewater collection tank 708 monitors the wastewater level in the tank in real time. When the level reaches the set value, the level sensor 29 transmits the signal to the controller 1. The controller 1 controls the drain valve 10 to open, and the wastewater is transported through the pipeline to the plant's sewage treatment station for centralized treatment. Finally, the deeply purified exhaust gas enters the external exhaust pipe through the exhaust pipe 8 at the top of the spray tower 25 and is discharged into the atmosphere or transported to subsequent treatment equipment. Throughout the process, all components work together to achieve the synergistic and efficient removal of nitrogen oxides and ammonia, meeting environmental emission requirements.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-nitrogen, ammonia-rich waste gas spray treatment device, comprising a controller (1) and a dust removal catalyst assembly (2), characterized in that: The dust removal catalyst component (2) is connected to a first spray tower (3) on the right side. The top of the first spray tower (3) is connected to a connecting pipe (4). A second spray tower (5) is provided on the right side of the first spray tower (3). The left side of the second spray tower (5) is connected to the right side of the connecting pipe (4). Both the first spray tower (3) and the second spray tower (5) are provided with a filtration structure (6). A liquid supply recovery component (7) is provided on the outside of the first spray tower (3) and the second spray tower (5). The liquid supply and recovery assembly (7) includes a circulation pump (701) located behind the first spray tower (3) and the second spray tower (5). The suction end of the circulation pump (701) is connected to the rear side of the first spray tower (3) and the second spray tower (5), respectively. The output end of the circulation pump (701) is connected to a circulation valve (702) and a recovery valve (703), respectively. The top of the circulation valve (702) is connected to a conduit (704). Spray rings (705) are provided inside the first spray tower (3) and the second spray tower (5). The ring (705) is connected to the conduit (704). A liquid level sensor (706) and a pH sensor (707) are installed on the right side of the first spray tower (3) and the second spray tower (5). The sensing ends of the liquid level sensor (706) and the pH sensor (707) are located inside the first spray tower (3) and the second spray tower (5). The back side of the recovery valve (703) is connected to a wastewater collection tank (708) through a pipe. An external replenishment valve (709) is connected to the left side of the first spray tower (3) and the second spray tower (5).

2. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 1, characterized in that: The dust removal catalyst component (2) includes a V-SCR catalyst shell (201) connected to the left side of the spray tower (3), and the interior of the V-SCR catalyst shell (201) is provided with a cordierite honeycomb carrier (202).

3. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 2, characterized in that: The left side of the V-SCR catalyst housing (201) is connected to a dust removal housing (203), and a dust filter (204) is provided inside the dust removal housing (203).

4. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 3, characterized in that: A temperature sensor (205) is provided at the bottom of the dust collector housing (203), and the sensing end of the temperature sensor (205) is located inside the dust collector housing (203).

5. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 1, characterized in that: The extended filtration structure (6) includes a lower grid plate (601) fixedly connected inside the spray tower one (3) and the spray tower two (5), and the top of the lower grid plate (601) is filled with PP multi-faceted hollow ball packing (602).

6. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 5, characterized in that: The top of the PP multifaceted hollow sphere packing (602) is provided with an upper grid plate (603), which is located at the bottom of the spray ring (705). The top sides of the spray tower one (3) and the spray tower two (5) are both provided with folded wire mesh demisters (604), which are located at the top of the spray ring (705).

7. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 1, characterized in that: The top of the second spray tower (5) is connected to an exhaust pipe (8), which is connected to an exhaust pipe to the atmosphere or subsequent treatment equipment.

8. The low-nitrogen, ammonia-rich waste gas spray treatment device according to claim 1, characterized in that: A level sensor 2 (9) is provided on the right side of the wastewater collection tank (708). The sensing end of the level sensor 2 (9) is located inside the wastewater collection tank (708). A drain valve (10) is connected to the rear side of the wastewater collection tank (708). The drain valve (10) is connected to the sewage treatment station in the plant area through a pipeline.

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