A urea production exhaust gas treatment device for vehicles

Abstract

The application relates to a waste gas treatment equipment for vehicle urea production, which comprises a spraying tower, an air inlet is formed in the side of the spraying tower, an air outlet is arranged at the top of the spraying tower, a spraying assembly is arranged between the air inlet and the air outlet, an exhaust pipeline is connected to the air outlet, a power fan is installed on the exhaust pipeline, a blocking mechanism is arranged between the spraying assembly and the air outlet, the blocking mechanism comprises a blocking plate and a flow guide plate, the blocking plate is obliquely arranged in the spraying tower and faces the spraying assembly, and the blocking plate blocks the air outlet in the spraying tower; the flow guide plate is fixed to one end of the blocking plate which faces the spraying assembly, the flow guide plate is obliquely arranged, and the oblique direction of the flow guide plate is opposite to that of the blocking plate. The application has the effect of reducing the probability of VOC capturing agent water droplets being passively drawn out of the spraying tower by the power fan.

Description

Technical Field

[0001] This application relates to the field of exhaust gas treatment equipment, and more particularly to an exhaust gas treatment device for automotive urea production. Background Technology

[0002] VOCs is short for volatile organic compounds, including hydrocarbons, aromatics, alcohols, aldehydes, amines, organic acids, etc. The production of automotive urea typically generates large amounts of VOCs in waste gas. VOCs are highly volatile at room temperature, posing a serious threat to the environment; therefore, the waste gas must be treated before being released.

[0003] A Chinese invention patent with publication number CN112495140A discloses a VOCs waste gas treatment system, including a waste gas collection system, a scrubbing gas absorption and adsorption device, a demister, and a pyrolysis combustion regeneration device. The scrubbing gas absorption and adsorption device includes a spray tower, a first scrubbing absorbent tank, a second scrubbing absorbent tank, and an absorbent desorption tank. The first scrubbing absorbent tank is fixedly installed on the side wall of the spray tower via a pipe. The rear end of the spray tower is connected to the demister. The absorbent desorption tank is also provided with an air outlet, which is connected to the pyrolysis combustion regeneration device via a pipe. The absorbent desorption tank is also provided with an air inlet connected to the air outlet of the pyrolysis combustion regeneration device. The absorbent desorption tank and the pyrolysis combustion regeneration device also include a heat exchanger. The pyrolysis combustion regeneration device includes a burner.

[0004] Regarding the aforementioned technologies, existing spray towers absorb VOCs from waste gas by spraying VOC scavenging agents. After the VOCs in the waste gas are absorbed, the treated waste gas is extracted from the spray tower and discharged through pipelines and a power fan. The inventor believes that in the existing technology, spraying is used to spray VOC scavenging agents, which adsorb VOCs. However, because the water droplets of VOC scavenging agents are small, they are easily extracted from the spray tower by the power fan, thus polluting the environment. Summary of the Invention

[0005] In order to reduce the probability that VOC capture agent water droplets are drawn out of the spray tower by the power fan, this application provides a waste gas treatment device for automotive urea production.

[0006] The technical solution of the exhaust gas treatment equipment for automotive urea production provided in this application is as follows:

[0007] A waste gas treatment device for automotive urea production includes a spray tower with an air inlet on its side and an air outlet at its top. A spray assembly is disposed between the air inlet and the air outlet. The air outlet is connected to an exhaust pipe, and a power fan is installed on the exhaust pipe. A blocking mechanism is disposed between the spray assembly and the air outlet. The blocking mechanism includes a baffle plate and a guide plate. The baffle plate is inclined towards the spray assembly and disposed inside the spray tower, blocking the air outlet inside the spray tower. The guide plate is fixed to the end of the baffle plate facing the spray assembly and is inclined in the opposite direction to the baffle plate.

[0008] By adopting the above technical solution, the inclined baffle plate can block water droplets, thereby reducing the probability that VOC capture agent water droplets will be drawn out of the spray tower by the power fan. The flow guide plate and the baffle plate are set in opposite directions to further improve the effect of blocking water droplets.

[0009] Optionally, the end of the baffle away from the spray assembly is rotatably installed inside the spray tower, and the rotation of the baffle adjusts the tilt angle of the baffle and the area of ​​the air outlet blocked by the baffle.

[0010] By adopting the above technical solution, the angle of the baffle plate can be adjusted to adjust the size of the air outlet according to actual needs.

[0011] Optionally, there are two baffles, which are rotatably mounted on opposite sides of the spray tower.

[0012] By adopting the above technical solution, using two baffles can save the space required for the baffles to rotate.

[0013] Optionally, the spray tower is provided with a drive assembly, which includes a drive gear, a drive rack, and a drive component. The drive gear is mounted on a baffle plate, and the rotation of the drive gear drives the baffle plate to rotate. The drive rack is slidably disposed on the spray tower and meshes with the drive gear. The drive component is mounted on the spray tower and drives the drive rack to slide.

[0014] By adopting the above technical solution, the setting of the drive component facilitates the adjustment of the angle of the blocking plate.

[0015] Optionally, a linkage is provided between the drive components on the two blocking plates, and the linkage connects the drive racks of the two drive components.

[0016] By adopting the above technical solution, the linkage mechanism can be conveniently set to drive two blocking plates simultaneously.

[0017] Optionally, the spray assembly includes spray pipes and spray heads. The spray pipes are evenly arranged in several rows along the height direction of the spray tower. One end of the spray pipe is inserted into the spray tower, and the other end is connected to and communicates with a liquid pipe. There are several spray heads, which are evenly arranged along the length direction of the spray pipes.

[0018] By adopting the above technical solution, multiple spraying is achieved through multiple spray pipes set along the height of the spray tower, thereby improving the capture effect of VOCs.

[0019] Optionally, a circulation pipe is provided near the bottom of the spray tower, the circulation pipe connecting the liquid pipeline and the bottom of the spray tower, and a circulation pump is installed on the circulation pipe.

[0020] By adopting the above technical solution, the contact time between the sprayed VOC scavenger and VOCs is short, so the VOC scavenger will not reach saturation in a single spray. The circulation pump can enable the VOCs to be reused when they are unsaturated.

[0021] Optionally, a drain pipe is connected and connected near the bottom of the spray tower, and the end of the drain pipe away from the spray tower is connected and connected to a reaction vessel. A heating element is installed inside the reaction vessel, and a discharge pipe is connected and connected to the reaction vessel.

[0022] By adopting the above technical solution, the drain pipe can discharge the saturated VOC scavenger into the reaction vessel for heating and desorption, thereby realizing the recycling of the VOC scavenger.

[0023] Optionally, a reflux pipe is connected to the reactor, and the reflux pipe connects and communicates with the reactor and the spray tower.

[0024] By adopting the above technical solution, the reflux pipe can send the heated and desorbed VOC capture agent back into the spray tower for reuse.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. The inclined baffle plate can block water droplets, thereby reducing the probability that the VOC capture agent water droplets will be drawn out of the spray tower by the power fan. The baffle plate is set in the opposite direction to the flow guide plate, which can further improve the effect of blocking water droplets.

[0027] 2. The angle of the baffle plate can be adjusted to adjust the size of the air outlet according to actual needs;

[0028] 3. The drive component is designed to facilitate adjustment of the baffle angle;

[0029] 4. The linkage mechanism allows for convenient simultaneous driving of two blocking plates;

[0030] 5. Multiple spray pipes installed along the height of the spray tower enable multiple spraying processes, thereby improving the VOCs capture effect;

[0031] 6. The VOC scavenger sprayed has a short contact time with VOCs, so a single spray of VOC scavenger will not reach saturation. The circulation pump allows VOCs to be reused when unsaturated.

[0032] 7. The drain pipe can discharge the saturated VOC scavenger into the reactor for heating and desorption, thereby realizing the recycling of the VOC scavenger. Attached Figure Description

[0033] Figure 1 This is a cross-sectional structural diagram of this embodiment.

[0034] Figure 2 This is a schematic diagram of the overall structure of this embodiment.

[0035] Explanation of reference numerals in the attached drawings: 1. Spray tower; 2. Air inlet; 3. Air outlet; 4. Spray assembly; 41. Spray pipe; 42. Spray head; 5. Exhaust pipe; 6. Power fan; 7. Baffle mechanism; 71. Baffle plate; 72. Guide plate; 8. Drive assembly; 81. Drive gear; 82. Drive rack; 83. Drive component; 9. Linkage component; 10. Liquid pipe; 11. Circulation pipe; 12. Circulation pump; 13. Drain pipe; 14. Reactor; 15. Heating element; 16. Discharge pipe; 17. Return pipe. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-2 This application will be described in further detail.

[0037] This application discloses an exhaust gas treatment device for automotive urea production, referring to... Figure 1 The system includes a spray tower 1, with an air inlet 2 on the side of the middle section of the spray tower 1. The air inlet 2 is used to connect to the exhaust pipe of the equipment for producing automotive urea. An air outlet 3 is provided at the top of the spray tower 1. A spray assembly 4 is provided between the air inlet 2 and the air outlet 3. The air outlet 3 is connected to an exhaust pipe 5. A power fan 6 is installed on the exhaust pipe 5. A blocking mechanism 7 is provided between the spray assembly 4 and the air outlet 3. The blocking mechanism 7 includes a blocking plate 71 and a guide plate 72. The blocking plate 71 faces the spray assembly. 4. An inclined baffle plate 71 is installed inside the spray tower 1 to block the air outlet 3. A guide plate 72 is fixed on the end of the baffle plate 71 facing the spray assembly 4. The guide plate 72 is inclined and the inclination direction of the guide plate 72 is opposite to that of the baffle plate 71. The inclined baffle plate 71 can block water droplets, thereby reducing the probability that the VOC capture agent water droplets will be drawn out of the spray tower 1 by the power fan 6. The opposite arrangement of the guide plate 72 and the baffle plate 71 can further improve the effect of blocking water droplets.

[0038] Reference Figure 1 There are two baffle plates 71. The ends of the two baffle plates 71 away from the spray assembly 4 are rotatably installed inside the spray tower 1. The two baffle plates 71 are respectively rotatably installed on opposite sides of the spray tower 1, forming a split configuration. The split configuration of the baffle plates 71 requires less space to rotate, which can save space. The rotating end of the baffle plate 71 is integrally formed with a rotating shaft. The rotating shaft passes through the spray tower 1 on both sides of the width direction of the baffle plate 71 and extends out of the spray tower 1. The rotating shaft is sealed at the point where it passes through the spray tower 1. The rotation of the baffle plate 71 can adjust the tilt angle of the baffle plate 71 and adjust the area of ​​the baffle plate 71 blocking the air outlet 3. When the two baffle plates 71 rotate to abut each other, the baffle plates 71 completely block the air outlet 3, thereby limiting the leakage of gas in the spray tower 1. When the two baffle plates 71 abut each other, the two guide plates 72 also abut each other, thereby playing a sealing role.

[0039] Reference Figure 1 and Figure 2 A drive assembly 8 is provided on the spray tower 1, and the drive assembly 8 is set corresponding to the baffle plate 71. Both ends of the baffle plate 71 in the width direction are provided with drive assemblies 8. The rotation of the baffle plate 71 is made smoother by driving the two sets of drive assemblies 8 simultaneously. The drive assembly 8 includes a drive gear 81 fixedly installed at one end of the baffle plate 71 that extends out of the spray tower 1, a drive rack 82 slidably set on the spray tower 1, and a drive component 83 installed on the spray tower 1. The rotation of the drive gear 81 drives the baffle plate 71 to rotate. The drive rack 82 meshes with the drive gear 81. The drive component 83 drives the drive rack 82 to slide. The drive component 83 is a drive electric cylinder. A linkage 9 is provided between the drive assemblies 8 on the two baffle plates 71. The linkage 9 is a linkage rod. The two ends of the linkage rod are respectively connected to the drive racks 82 of the two sets of drive assemblies 8. A linkage rod is also provided between the drive racks 82 of the two sets of drive assemblies 8 on the same baffle plate 71. The linkage rod realizes the linkage of the drive racks 82 of multiple sets of drive assemblies 8, which facilitates the rotation of the baffle plate 71.

[0040] Reference Figure 1The spray assembly 4 includes spray pipes 41 and spray heads 42. Several rows of spray pipes 41 are evenly arranged along the height of the spray tower 1, with three spray pipes 41 arranged horizontally in each row. One end of each spray pipe 41 is inserted into the spray tower 1, and the other end is connected to a liquid pipe 10. The liquid pipe 10 is connected to a VOC scavenging agent source. Several spray heads 42 are evenly arranged along the length of the spray pipes 41 within the spray tower 1. The liquid pipe 10 delivers the VOC scavenging agent to the spray pipes 41. The VOCs waste gas is captured by spraying VOC scavenging agent into the spray tower 1 through the spray head 42, thereby achieving VOCs waste gas treatment; a circulation pipe 11 is set near the bottom of the spray tower 1, the circulation pipe 11 connects the liquid pipe 10 and the bottom of the spray tower 1, and a circulation pump 12 is installed on the circulation pipe 11. The contact time between the sprayed VOC scavenging agent and VOCs is short, so the VOC scavenging agent will not reach saturation in a single spray. The setting of the circulation pump 12 allows the VOCs to be reused when unsaturated.

[0041] Reference Figure 1 A drain pipe 13 is connected and connected to the bottom of the spray tower 1. The end of the drain pipe 13 away from the spray tower 1 is connected and connected to the reaction vessel 14. A heating element 15 is installed in the reaction vessel 14. The heating element 15 is a heating wire. By energizing the heating wire, the temperature inside the reaction vessel 14 is increased. The VOC scavenging agent is heated and desorbed by the high temperature, and the VOCs waste gas is separated from the VOC scavenging agent. An exhaust pipe 16 is connected and connected to the reaction vessel 14. The exhaust pipe 16 discharges the VOCs waste gas separated from the VOC scavenging agent out of the reaction vessel 14, which is convenient for subsequent treatment of the waste gas. The drain pipe 13 can discharge the saturated VOC scavenging agent into the reaction vessel 14 for heating and desorption, thereby realizing the recycling of the VOC scavenging agent. A return pipe 17 is connected to the reaction vessel 14. The return pipe 17 connects and connects the reaction vessel 14 and the spray tower 1. The return pipe 17 can send the heated and desorbed VOC scavenging agent back into the spray tower 1 for reuse.

[0042] The implementation principle of this application embodiment is as follows: The exhaust pipe of the automotive urea production equipment is connected to the air inlet 2 on the spray tower 1. The drive component 83 is activated, and the drive component 83 drives the baffle plate 71 to adjust the area of ​​the baffle plate 71 covering the air outlet 3. Then, the exhaust gas generated from the automotive urea production equipment is sent into the spray tower 1 through the air inlet 2. When the VOCs waste gas enters the spray tower 1, the spraying mechanism is activated at the same time. The spray head 42 sprays VOC scavenging agent. After the VOCs waste gas is adsorbed, the VOC scavenging agent falls to the bottom of the spray tower 1. After the VOCs waste gas in the exhaust gas is adsorbed, the remaining gas is sent out of the spray tower 1 through the air outlet 3 to complete the exhaust gas treatment. During the process, some of the VOC scavenging agent will carry away the VOCs waste gas. The VOCs-laden exhaust gas is drawn towards the outlet 3. The baffle plate 71 can block part of the VOC scavenger and guide it down to the bottom of the spray tower 1 through the guide plate 72. When the VOC scavenger at the bottom of the spray tower 1 is not saturated, the VOC scavenger is sent from the circulation pipe 11 into the spray mechanism for reuse. When the VOC scavenger at the bottom of the spray tower 1 is saturated, the VOC scavenger is sent from the drain pipe 13 into the reactor 14 for heating and desorption, and then sent back to the bottom of the spray tower 1 through the return pipe 17 and reused through the circulation pipe 11. After the VOC scavenger has been heated and desorbed multiple times, it can no longer be used. At this time, the VOC scavenger can be discharged through the discharge pipe 16 and then treated by RCO catalytic combustion.

[0043] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A waste gas treatment device for automotive urea production, comprising a spray tower (1), wherein an air inlet (2) is provided on the side of the spray tower (1), an air outlet (3) is provided on the top of the spray tower (1), a spray assembly (4) is provided between the air inlet (2) and the air outlet (3), the air outlet (3) is connected to an exhaust pipe (5), and a power fan (6) is installed on the exhaust pipe (5), characterized in that: A blocking mechanism (7) is provided between the spray assembly (4) and the air outlet (3). The blocking mechanism (7) includes a blocking plate (71) and a guide plate (72). The blocking plate (71) is inclined towards the spray assembly (4) and installed inside the spray tower (1), blocking the air outlet (3) inside the spray tower (1). The guide plate (72) is fixed at one end of the blocking plate (71) facing the spray assembly (4), and the guide plate (72) is inclined in the opposite direction to the blocking plate (71). The end of the blocking plate (71) away from the spray assembly (4) is rotatably installed inside the spray tower (1). The blocking plate (71) can be rotated to adjust its tilt angle and the area of ​​the air outlet (3) blocked by the blocking plate (71). There are two blocking plates (71). Baffles (71) are rotatably mounted on opposite sides of the spray tower (1); a drive assembly (8) is provided on the spray tower (1), the drive assembly (8) includes a drive gear (81), a drive rack (82) and a drive member (83), the drive gear (81) is mounted on the baffle (71), the drive gear (81) rotates to drive the baffle (71) to rotate, the drive rack (82) is slidably mounted on the spray tower (1), the drive rack (82) meshes with the drive gear (81), the drive member (83) is mounted on the spray tower (1), the drive member (83) drives the drive rack (82) to slide; a linkage member (9) is provided between the drive assemblies (8) on the two baffles (71), the linkage member (9) connects the drive racks (82) of the two drive assemblies (8).

2. The waste gas treatment equipment for automotive urea production according to claim 1, characterized in that: The spray assembly (4) includes a spray pipe (41) and a spray head (42). The spray pipe (41) is evenly arranged in several rows along the height direction of the spray tower (1). One end of the spray pipe (41) is inserted into the spray tower (1), and the other end is connected to and communicates with a liquid pipe (10). There are several spray heads (42), and the several spray heads (42) are evenly arranged along the length direction of the spray pipe (41).

3. The waste gas treatment equipment for automotive urea production according to claim 2, characterized in that: A circulation pipe (11) is provided near the bottom of the spray tower (1). The circulation pipe (11) connects the liquid pipe (10) and the bottom of the spray tower (1). A circulation pump (12) is installed on the circulation pipe (11).

4. The waste gas treatment equipment for automotive urea production according to claim 1, characterized in that: A drain pipe (13) is connected and connected to the bottom of the spray tower (1). The end of the drain pipe (13) away from the spray tower (1) is connected and connected to a reaction vessel (14). A heating element (15) is installed inside the reaction vessel (14). A discharge pipe (16) is connected and connected to the reaction vessel (14).

5. The waste gas treatment equipment for automotive urea production according to claim 4, characterized in that: The reactor (14) is connected to a reflux pipe (17), which connects and communicates with the reactor (14) and the spray tower (1).

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