Urea production tail gas treatment device and method

Abstract

The application relates to the chemical tail gas treatment technical field, in particular to a urea production tail gas treatment device and method, which comprises a treatment box, a filter box, an air inlet channel and a filter plate, the filter box is arranged on one side of the treatment box, the air inlet channel is fixedly installed on one side of the filter box, the filter plate is fixedly installed in the filter box, and a treatment assembly is further arranged; the treatment assembly comprises an access pipe, a connecting channel, a one-way introduction valve, a mixing component, an exhaust component and an extraction component, the access pipe is fixedly installed on the treatment box, the connecting channel is connected with the access pipe and the filter box on the two sides, the one-way introduction valve is installed on the connecting channel, the related structure for absorbing waste gas and the exhaust structure can be adjusted in real time according to the actual waste gas introduction condition through the arranged component, and the final waste gas treatment effect is better.

Description

Technical Field

[0001] This invention relates to the field of chemical waste gas treatment technology, and in particular to a device and method for treating urea production waste gas. Background Technology

[0002] During urea production, the synthesis reaction is a reversible process, making complete conversion difficult and resulting in the residue of unreacted ammonia and carbon dioxide. At the same time, the circulation system used in the process to improve the utilization rate of raw materials causes some gases to repeatedly pass through the reactor without being fully absorbed. Therefore, tail gas containing ammonia, carbon dioxide and other components is finally formed. The ammonia in the tail gas has an irritating odor and is one of the important pollutants in air pollution. It can irritate the respiratory tract and eyes, and long-term exposure may lead to poisoning. Although carbon dioxide is non-toxic, excessive emissions will exacerbate the greenhouse effect and have a negative impact on the global climate. Therefore, it is necessary to use appropriate treatment devices to treat the generated tail gas.

[0003] Existing exhaust gas treatment devices typically include an absorption tower, a cooling system, a separation system, and a treatment system. The exhaust gas enters the absorption tower from the bottom and is then cooled by the cooling system. After that, it passes through the separation system and the treatment system in sequence to treat and purify the solid impurities and waste gas in the exhaust gas.

[0004] Existing exhaust gas treatment devices utilize the fact that ammonia is highly soluble in water. Ammonia waste gas is passed through an aqueous solution, where it physically dissolves to form ammonia water. This ammonia water then reacts with carbon dioxide to produce ammonium carbonate or ammonium bicarbonate. Ammonium bicarbonate is relatively stable, can exist for a long time at room temperature, and is a commonly used nitrogen fertilizer in agriculture. However, existing exhaust gas treatment devices suffer from unstable control over the final reactants when treating ammonia and carbon dioxide. Furthermore, the reaction of the aqueous solution with ammonia and carbon dioxide easily leads to ammonia and carbon dioxide leaks, resulting in unsatisfactory overall exhaust gas treatment efficiency and final treatment effect, causing significant inconvenience in practical applications. Summary of the Invention

[0005] The purpose of this invention is to provide a urea production tail gas treatment device and method, which can adjust the relevant structures for absorbing and discharging waste gas in real time according to the actual waste gas introduction situation through the provided components, so as to achieve better final waste gas treatment effect.

[0006] To achieve the above objectives, the present invention provides a urea production tail gas treatment device and method, including a treatment box, a filter box, an air inlet channel and a filter plate. The filter box is disposed on one side of the treatment box, the air inlet channel is fixedly installed on one side of the filter box, the filter plate is fixedly installed inside the filter box, and the invention also includes a treatment component.

[0007] The processing assembly includes an inlet pipe, a connecting channel, a one-way inlet valve, a mixing component, a discharge component, and an extraction component. The inlet pipe is fixedly installed on the processing box. The connecting channel is connected to the inlet pipe and the filter box on both sides, respectively. The one-way inlet valve is installed on the connecting channel. The mixing component is connected to the processing box and is used to treat the waste gas introduced into the processing box. The discharge component is connected to the processing box and is used to export the treated gas. The extraction component is connected to the processing box and is used to assist in the discharge of gas inside the processing box.

[0008] The mixing component includes a connecting bracket, a sinking jet ejector, a lead screw adjustment mechanism, a sensing and control component, and a partition component. The connecting bracket is fixedly installed inside the processing tank. The sinking jet ejector is slidably installed on the connecting bracket and connected to the inlet pipe. The lead screw adjustment mechanism is connected to the processing tank and is used to drive the sinking jet ejector. The sensing and control component is connected to the processing tank and is used to adjust the working condition of the liquid inside the processing tank. The partition component is connected to the processing tank and is used to separate the liquid inside the processing tank.

[0009] The discharge component includes a one-way discharge valve, a discharge pipe rack, a mounting plug, and a flow control component. The one-way discharge valve is installed inside the treatment box. The discharge pipe rack is connected to the one-way discharge valve and is fixedly installed on one side of the treatment box. The discharge pipe rack has a total of five interfaces. The mounting plug is installed on the corresponding interface of the discharge pipe rack. The flow control component is connected to the discharge pipe rack and is used to control the gas flow within the discharge pipe rack.

[0010] The extraction component includes an extraction box, an extraction plug holder, an extraction cylinder, and a gas sensing mechanism. The extraction box is connected to one of the connectors of the discharge pipe rack and is fixedly installed on one side of the processing box. The extraction plug holder is connected to the extraction box. The output end of the extraction cylinder is connected to the extraction plug holder and is fixedly installed on one side of the processing box. The gas sensing mechanism is installed on the side of the discharge pipe rack near the extraction box and is used to measure the gas composition entering the extraction box.

[0011] The sensing and control components include a water level sensor and a heating mechanism. The water level sensor is fixedly installed inside the processing tank. The heating mechanism is installed on the processing tank and is used to heat the liquid inside the processing tank.

[0012] The partition component includes a perforated bottom cover, a shielding bracket, and a retaining spring. The perforated bottom cover is fixedly installed at the bottom of the sinking jet frame; the shielding bracket is slidably installed inside the processing box; and the two sides of the retaining spring are respectively connected to the shielding bracket and the processing box.

[0013] The flow control component includes a guide tube slide, a screw moving mechanism, an inner discharge column, a top plug bracket, and a lifting cylinder. The guide tube slide is slidably installed inside the discharge pipe support. The screw moving mechanism is connected to the discharge pipe support and is used to drive the guide tube slide. The inner discharge column is slidably installed on the upper end of the discharge pipe support. The top plug bracket is fixedly installed on the side of the discharge pipe support near the inner discharge column. The output end of the lifting cylinder is connected to the inner discharge column, and the lifting cylinder is fixedly installed on one side of the discharge pipe support.

[0014] The processing component further includes an inlet detection mechanism, an inlet pipe, an inlet check valve, and a cleaning component. The inlet detection mechanism is installed on the filter box; the inlet pipe is connected to the connecting channel and to the discharge pipe rack through a corresponding pipe; the inlet check valve is installed on the inlet pipe; and the cleaning component is connected to the filter box and is used to clean the filter plates inside the filter box.

[0015] The cleaning component includes a scraper plate, a rotating guide ring, and a gear drive mechanism. The scraper plate 901 is slidably installed inside the filter box. The rotating guide ring is connected to the scraper plate and is rotatably installed on one side of the filter box. The gear drive mechanism is connected to the filter box and is used to drive the rotating guide ring.

[0016] A method for treating urea production tail gas, using the aforementioned urea production tail gas treatment device, includes the following steps.

[0017] The generated exhaust gas is introduced into the filter box through the air intake channel. The filter plate in the filter box blocks solid impurities in the exhaust gas, thus completing the preliminary treatment and purification of the exhaust gas.

[0018] The exhaust gas filtered by the filter plate enters the inlet pipe through the connecting channel and the one-way inlet valve. Then, the exhaust gas introduced by the inlet pipe and the mixing component are fully mixed with the liquid inside the treatment tank.

[0019] The exhaust gas is further treated and purified by reacting and mixing with the liquid inside the treatment tank. After that, the treated exhaust gas is detected by the discharge component and the extraction component.

[0020] Based on the detection results of the waste gas after the reaction, the waste gas is directly discharged or transferred through the discharge component and the extraction component, thereby completing the discharge of compliant waste gas and the re-transfer treatment of non-compliant waste gas.

[0021] This invention discloses a urea production tail gas treatment device. In actual operation, the generated waste gas is introduced into a filter box through an air inlet channel. The filter plate in the filter box blocks solid impurities in the waste gas, completing the initial treatment and purification of the emitted waste gas. The waste gas filtered by the filter plate enters the inlet pipe through a connecting channel and a one-way inlet valve. Then, the waste gas introduced through the inlet pipe and the mixing component are fully mixed with the liquid inside the treatment box. The waste gas completes further treatment and purification through reaction and mixing with the liquid inside the treatment box. Afterwards, the treated waste gas is detected by a discharge component and an extraction component. Based on the detection results of the reacted waste gas, the waste gas is directly discharged or transferred through the discharge component and the extraction component. This completes the discharge of qualified waste gas and the re-transfer treatment of unqualified waste gas. It realizes that the relevant structures for absorbing waste gas and the discharge structure can be adjusted in real time according to the actual waste gas introduction situation through the provided components, so as to achieve better final waste gas treatment effect. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the overall structure of the urea production tail gas treatment device of the present invention.

[0024] Figure 2 This is a schematic diagram of the installation structure of the discharge pipe rack of the present invention.

[0025] Figure 3 This is a schematic diagram of the processed box of the present invention after being cut open.

[0026] Figure 4 This is a schematic diagram of the processed box and the filtered box of the present invention after being cut open.

[0027] Figure 5 This is a schematic diagram of the structure of the discharge pipe rack and the intake box after being cut open according to the present invention.

[0028] Figure 6 This is a schematic diagram of the cross-section of the guide hole sliding column and the discharge inner column of the present invention.

[0029] Figure 7 This is the invention Figure 6 Enlarged view of point A.

[0030] Figure 8This is a flowchart of the urea production tail gas treatment method of the present invention.

[0031] In the diagram: 101-Processing box, 102-Filter box, 103-Inlet channel, 104-Filter plate, 105-Connection pipe, 106-Connection channel, 107-One-way inlet valve, 201-Connecting bracket, 202-Submerged jet rack, 203-Screw adjustment mechanism, 301-One-way discharge valve, 302-Discharge pipe rack, 303-Installation plug, 401-Inlet box, 402-Inlet plug rack, 403-Extraction cylinder, 404-Gas sensor Mechanism, 501-Water level sensor, 502-Heating mechanism, 601-Hollow bottom seal frame, 602-Shielding bracket, 603-Resisting spring, 701-Guide hole slide column, 702-Screw moving mechanism, 703-Discharge inner column, 704-Top plug frame, 705-Lifting cylinder, 801-Inlet detection mechanism, 802-Inlet pipe, 803-Inlet check valve, 901-Scraper plate, 902-Rotating guide ring, 903-Gear drive mechanism. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, it should be understood that "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Please see Figures 1 to 7This invention provides a urea production tail gas treatment device and method: including a treatment box 101, a filter box 102, an air inlet channel 103, a filter plate 104, and a treatment assembly. The treatment assembly includes an inlet pipe 105, a connecting channel 106, a one-way inlet valve 107, a mixing component, a discharge component, and an extraction component. The mixing component includes a connecting bracket 201, a sinking jet frame 202, a screw adjustment mechanism 203, a sensing and control component, and a partition component. The discharge component includes a one-way discharge valve 301, a discharge pipe frame 302, an installation plug 303, and a flow control component. The extraction component includes an extraction box 401, an extraction plug frame 402, an extraction cylinder 403, and a gas sensing mechanism 404. The sensing and control component includes a water level sensor 501 and a heating mechanism 502. The partition component includes a perforated bottom seal frame 601, a shielding bracket 602, and a blocking spring 603. The flow control component... The device includes a guide slide column 701, a lead screw moving mechanism 702, an inner discharge column 703, a top plug frame 704, and a lifting cylinder 705. This solution addresses the problem in existing exhaust gas treatment devices where ammonia is highly soluble in water. Ammonia waste gas can be passed through an aqueous solution, where it physically dissolves to form ammonia water. This ammonia water can also react with carbon dioxide to produce ammonium carbonate or ammonium bicarbonate. Ammonium bicarbonate is relatively stable, can exist for a long time at room temperature, and is a commonly used nitrogen fertilizer in agriculture. However, existing exhaust gas treatment devices suffer from unstable control over the final reactants when treating ammonia and carbon dioxide. Furthermore, the reaction of the aqueous solution with ammonia and carbon dioxide easily leads to ammonia and carbon dioxide leaks, resulting in unsatisfactory overall exhaust gas treatment efficiency and final treatment effect, causing significant inconvenience in practical applications.

[0035] Furthermore, the filter box 102 is disposed on one side of the treatment box 101, the air inlet channel 103 is fixedly installed on one side of the filter box 102, the filter plate 104 is fixedly installed inside the filter box 102, the inlet pipe 105 is fixedly installed on the treatment box 101, the two sides of the connecting channel 106 are respectively connected to the inlet pipe 105 and the filter box 102, the one-way inlet valve 107 is installed on the connecting channel 106, the mixing component is connected to the treatment box 101 for treating the waste gas introduced into the treatment box 101, the discharge component is connected to the treatment box 101 for exporting the treated gas, and the extraction component is connected to the treatment box 101 for assisting in the discharge of the gas inside the treatment box 101.

[0036] Specifically, the top and bottom of the processing tank 101 are respectively provided with corresponding liquid inlet pipes and liquid outlet pipes, which enable the introduction and discharge of liquid inside the processing tank 101.

[0037] The inlet pipe 105 is inserted into the processing box 101. The inlet pipe 105 is connected to the inside of the filter box 102 through the connecting channel 106. The one-way inlet valve 107 is fixed on the connecting channel 106. The one-way inlet valve 107 can realize the one-way flow of gas, so that the gas in the filter box 102 can enter the inlet pipe 105 through the connecting channel 106, while the gas in the inlet pipe 105 cannot enter the filter box 102 through the connecting channel 106, thus ensuring a stable one-way flow of gas.

[0038] The filter plate 104 is fixed inside the filter box 102. The filter plate 104 is provided with a plurality of small filter holes. The air inlet channel 103 is also provided on the side of the filter box 102. Exhaust gas can directly enter the filter box 102 through the air inlet channel 103, and then pass through the filter plate 104 inside the filter box 102 to block solid impurities and dust in the exhaust gas.

[0039] In actual operation, the generated exhaust gas is introduced into the filter box 102 through the air intake channel 103. The filter plate 104 in the filter box 102 blocks solid impurities in the exhaust gas, completing the preliminary treatment and purification of the exhaust gas. The exhaust gas filtered by the filter plate 104 enters the inlet pipe 105 through the connecting channel 106 and the one-way inlet valve 107. Then, the exhaust gas introduced by the inlet pipe 105 and the mixing component are fully mixed with the liquid inside the treatment box 101. The exhaust gas completes further treatment and purification through reaction and mixing with the liquid inside the treatment box 101. Afterwards, the exhaust gas after treatment is detected by the discharge component and the extraction component. Based on the detection results of the reacted exhaust gas, the exhaust gas is directly discharged or transferred through the discharge component and the extraction component, completing the discharge of qualified exhaust gas and the re-transfer treatment of unqualified exhaust gas. It realizes that the relevant structures for absorbing exhaust gas and the discharge structure can be adjusted in real time according to the actual exhaust gas introduction situation by the provided components, so as to achieve better final exhaust gas treatment effect.

[0040] Furthermore, the connecting bracket 201 is fixedly installed inside the processing tank 101; the sinking jet frame 202 is slidably installed on the connecting bracket 201, and the sinking jet frame 202 is connected to the inlet pipe 105; the lead screw adjustment mechanism 203 is connected to the processing tank 101 and is used to drive the sinking jet frame 202; the sensing and control component is connected to the processing tank 101 and is used to adjust the working status of the liquid inside the processing tank 101; the partition component is connected to the processing tank 101 and is used to separate the liquid inside the processing tank 101.

[0041] In this embodiment, the connecting bracket 201 is fixed inside the treatment box 101. The sinking jet frame 202 is provided with corresponding mating plates that cooperate with the connecting bracket 201. The sinking jet frame 202 is also provided with corresponding access holes that cooperate with the access pipe 105. The bottom of the sinking jet frame 202 is provided with a disc-shaped aeration structure. Through multiple sets of aeration pipes arranged above and below the main disc, the waste gas can be fully mixed and reacted with the liquid submerging the aeration structure at the bottom of the sinking jet frame 202, thereby effectively absorbing and treating ammonia and carbon dioxide in the waste gas.

[0042] The sinking jet frame 202 is driven by the lead screw adjustment mechanism 203, which consists of a lead screw and a motor that drives the lead screw to rotate. The mating plate that cooperates with the connecting bracket 201 of the sinking jet frame 202 is provided with corresponding threaded holes. The rotation of the lead screw inside the lead screw adjustment mechanism 203 can drive the sinking jet frame 202 to move up and down under the guidance of the connecting bracket 201, thereby driving the entire sinking jet frame 202 accordingly.

[0043] Furthermore, the one-way discharge valve 301 is installed inside the processing box 101; the discharge pipe rack 302 is connected to the one-way discharge valve 301 and fixedly installed on one side of the processing box 101, and the discharge pipe rack 302 has a total of five interfaces; the mounting plug 303 is installed on the corresponding interface of the discharge pipe rack 302; the flow control component is connected to the discharge pipe rack 302 and is used to control the gas flow inside the discharge pipe rack 302.

[0044] In this embodiment, the one-way discharge valve 301 is installed inside the housing of the processing box 101. The outlet port of the one-way discharge valve 301 is connected to one of the interfaces of the discharge pipe rack 302. The discharge pipe rack 302 has interfaces in five directions: up, down, front, back, and left. The outlet port of the one-way discharge valve 301 facilitates connection with the left interface of the discharge pipe rack 302. The one-way discharge valve 301 ensures that gas can only enter the discharge pipe rack 302 from the processing box 101, while the gas in the discharge pipe rack 302 cannot flow back into the processing box 101, thus achieving one-way guidance of the gas.

[0045] The installation plug 303 is located at the front interface of the discharge pipe rack 302. The actual installation of the installation plug 303 can be adjusted according to the actual treatment situation. The rear interface of the discharge pipe rack 302 is connected to a corresponding mechanism for re-introducing the substandard gas into the treatment device for further treatment. It should be noted that in actual operation, the front interface of the discharge pipe rack 302 can be connected to the corresponding external treatment mechanism through the corresponding pipe. Since ammonia and carbon dioxide may overflow after the waste gas undergoes liquid absorption reaction, the waste gas cannot be completely treated. Therefore, when the emission gas is detected to be non-compliant, the substandard gas can be introduced into the external treatment mechanism or other treatment structures through the front and rear interfaces of the discharge pipe rack 302 and the corresponding connection structure to complete the secondary or even multiple treatment of the substandard gas and avoid the accidental emission of substandard gas.

[0046] The corresponding docking and processing mechanism can be adjusted according to the detection structure. If the ammonia content is still high, a secondary absorption and purification mechanism for ammonia can be used. If the carbon dioxide content is high, a carbon dioxide purification mechanism can be used. If both contents are high, it means that the liquid in the processing tank 101 can no longer absorb the gas. Therefore, the liquid in the processing tank 101 will be replaced, and the gas with high contents of both will re-enter the processing tank 101 for processing.

[0047] Furthermore, the intake box 401 is connected to one of the connectors of the discharge pipe rack 302, and the intake box 401 is fixedly installed on one side of the processing box 101; the intake plug rack 402 is connected to the intake box 401; the output end of the extraction cylinder 403 is connected to the extraction plug rack 402, and the extraction cylinder 403 is fixedly installed on one side of the processing box 101; the gas sensing mechanism 404 is installed on the side of the discharge pipe rack 302 near the intake box 401, and is used to measure the gas composition entering the intake box 401.

[0048] Furthermore, the water level sensor 501 is fixedly installed inside the processing tank 101; the heating mechanism 502 is installed on the processing tank 101 and is used to heat the liquid inside the processing tank 101.

[0049] In this embodiment, the bottom interface of the injection box 401 is connected to the bottom interface of the discharge pipe rack 302. The gas sensing mechanism 404 is located at the connection channel between the injection box 401 and the discharge pipe rack 302. The gas sensing mechanism 404 mainly includes a carbon dioxide detector and an ammonia detector, which are used to detect the ammonia and carbon dioxide content of the treated gas, respectively, and to discharge and transfer the subsequent gas according to the detection structure.

[0050] The intake box 401 is equipped with an intake plug 402, which is driven by the extraction cylinder 403. The extraction cylinder 403 moves the intake plug 402 up and down within the intake box 401, thereby adjusting the internal space of the intake box 401. This enables the intake and exhaust of gas, allowing the gas in the treatment box 101 to be discharged and transferred more quickly and stably through the discharge pipe rack 302.

[0051] The water level sensor 501 is installed inside the treatment tank 101, and the heating mechanism 502 is located on the inner wall of the treatment tank 101. The heating mechanism 502 consists of a heating plate and an electrical control system. The heating mechanism 502 can heat the liquid inside the treatment tank 101 to ensure a stable and rapid reaction between the liquid and ammonia and carbon dioxide. The water level sensor 501 is used to sense and detect the liquid level inside the treatment tank 101. In actual operation, the liquid level in the treatment tank 101 must submerge the disc-shaped structure at the bottom of the sinking jet frame 202. Regardless of whether the sinking jet frame 202 is in an ascending or descending state, the liquid inside the treatment tank 101 must submerge the disc-shaped structure at the bottom of the sinking jet frame 202 to ensure sufficient reaction and mixing of the introduced waste gas and liquid.

[0052] Furthermore, the hollow bottom sealing frame 601 is fixedly installed at the bottom of the sinking jet frame 202; the shielding bracket 602 is slidably installed inside the processing box 101; and the two sides of the blocking spring 603 are respectively connected to the shielding bracket 602 and the processing box 101.

[0053] In this embodiment, the bottom of the sinking jet frame 202 is fixed with the hollow bottom cover frame 601. The hollow bottom cover frame 601 is provided with multiple slot structures. The shielding bracket 602 is provided with shielding plates that are compatible with the slot structures of the hollow bottom cover frame 601. At the same time, the shielding bracket 602 is also provided with the blocking spring 603 on the rod that connects it to the processing box 101.

[0054] As the sinking jet frame 202 moves upward under the action of the screw adjustment mechanism 203, the hollow bottom sealing frame 601 also moves upward. After the hollow bottom sealing frame 601 and the shielding plate of the shielding bracket 602 are fully in contact, the hollow bottom sealing frame 601 and the shielding plate of the shielding bracket 602 will cut the liquid inside the treatment tank 101 into two parts, upper and lower. Then the liquid discharge pipe at the bottom of the treatment tank 101 can be opened to discharge the fully reacted solution. After that, new liquid is introduced from the top of the treatment tank 101 to facilitate the rapid replacement and discharge of the liquid. When the liquid is discharged, the exhaust gas can still be introduced through the sinking jet frame 202. Moreover, the continuous introduction of exhaust gas will not affect the normal discharge of the solution below, nor will it affect the composition of the solution below.

[0055] The blocking spring 603 can provide some protection for the shielding bracket 602 when the hollow bottom cover 601 cooperates with the bottom cover plate of the shielding bracket 602, so as to avoid excessive compression of the shielding bracket 602 due to the continuous upward movement of the hollow bottom cover 601.

[0056] Furthermore, the guide hole slide column 701 is slidably installed inside the discharge pipe rack 302; the lead screw moving mechanism 702 is connected to the discharge pipe rack 302 and is used to drive the guide hole slide column 701; the discharge inner column 703 is slidably installed on the upper end of the discharge pipe rack 302; the top plug frame 704 is fixedly installed on the side of the discharge pipe rack 302 near the discharge inner column 703; the output end of the lifting cylinder 705 is connected to the discharge inner column 703, and the lifting cylinder 705 is fixedly installed on one side of the discharge pipe rack 302.

[0057] In this embodiment, both the guide slide 701 and the discharge inner column 703 are provided with corresponding conductive structures. The guide slide 701 has two types of connecting structures: an "L"-shaped hole and a straight hole. When the guide slide 701 moves to the rightmost end, the "L"-shaped hole of the guide slide 701 connects the left side interface channel and the bottom interface channel of the discharge pipe rack 302, thus connecting the exhaust port of the intake box 401 and the exhaust port of the one-way discharge valve 301. When the guide slide 701 moves to the leftmost end, the straight hole of the guide slide 701 connects the discharge pipe rack 302. The bottom interface channel is connected to the channel above the discharge pipe rack 302. The channel above the discharge pipe rack 302 has three interfaces: front, rear, and top. This allows the intake box 401 to be connected to the channel above the discharge pipe rack 302. The connection status of the intake box 401 can be adjusted by adjusting the position of the guide hole slide 701, thereby corresponding to the air intake and air exhaust operations of the intake box 401. When the intake box 401 is absorbing air, the guide hole slide 701 moves to the rightmost end. When the intake box 401 is venting air, the guide hole slide 701 moves to the leftmost end.

[0058] The inner discharge column 703 is provided with a through central hole and two side holes of different heights. The inner discharge column 703 has three working states. When the inner discharge column 703 is at its highest position, the through central hole is blocked by the top plug 704. At this time, the rear side hole of the inner discharge column 703 aligns with the rear interface channel of the discharge pipe rack 302, allowing gas to enter the area above the discharge pipe rack 302 and be discharged from the rear interface channel of the discharge pipe rack 302 under the guidance of the inner discharge column 703. When the inner discharge column 703 is at the middle height, the inner discharge... The front hole of the column 703 will align with the front interface channel of the discharge pipe rack 302. At this time, the through hole of the discharge pipe rack 302 will still be blocked by the top plug 704, so the gas can be discharged from the front interface channel of the discharge pipe rack 302. Finally, when the inner discharge column 703 moves down to the lowest end, the through hole of the discharge pipe rack 302 will disengage from the top plug 704, and the top two sides of the inner discharge column 703 will also block the front and rear interface channels of the discharge pipe rack 302, so that the gas at the bottom of the discharge pipe rack 302 can be discharged directly from the top interface channel of the discharge pipe rack 302.

[0059] The front and rear channels of the discharge pipe rack 302 are used for the corresponding transfer of non-compliant gases, while the top channel of the discharge pipe rack 302 is used for normal gas discharge. The guide hole slide column 701 and the discharge inner column 703 are driven by the lead screw moving mechanism 702 and the lifting cylinder 705, respectively. The lead screw moving mechanism 702 and the lead screw adjusting mechanism 203 have the same structural principle, both of which drive the corresponding plates by cooperating with the corresponding lead screw and motor.

[0060] Preferably, the processing component provided by the present invention further includes an import detection mechanism 801, an import pipe 802, an import check valve 803, and a cleaning component, wherein the cleaning component includes a scraper 901, a rotating guide ring 902, and a gear drive mechanism 903.

[0061] Furthermore, the inlet detection mechanism 801 is installed on the filter box 102; the inlet pipe 802 is connected to the connecting channel 106 and to the discharge pipe rack 302 through a corresponding pipe; the inlet one-way valve 803 is installed on the inlet pipe 802; the cleaning component is connected to the filter box 102 and is used to clean the filter plate 104 inside the filter box 102.

[0062] In this embodiment, the top of the filter box 102 is provided with the inlet detection mechanism 801. The inlet detection mechanism 801 and the gas sensing mechanism 404 have the same structural principle. Both are to detect the gas components by setting corresponding sensors. The inlet detection mechanism 801 can detect the gas components after the initial purification. Then, the gas sensing mechanism 404 is used to detect and compare the corresponding components before and after the treatment, so as to better adjust the treatment structure.

[0063] The inlet pipe 802 is fixed to one side of the connecting channel 106. The inlet pipe 802 is equipped with the inlet one-way valve 803. The inlet pipe 802 is connected to the rear interface of the discharge pipe rack 302 through a corresponding pipe so that the substandard gas can be reintroduced into the treatment box 101 for treatment. The inlet one-way valve 803 ensures that the gas can only enter the connecting channel 106 from the discharge pipe rack 302, while the gas in the connecting channel 106 cannot enter the discharge pipe rack 302.

[0064] Furthermore, the scraper plate 901 is slidably installed inside the filter box 102; the rotating guide ring 902 is connected to the scraper plate 901 and is rotatably installed on one side of the filter box 102; the gear drive mechanism 903 is connected to the filter box 102 and is used to drive the rotating guide ring 902.

[0065] In this embodiment, the scraper 901 is disposed inside the filter box 102. The top of the scraper 901 abuts against the bottom of the filter plate 104 inside the filter box 102. By moving the scraper 901 left and right, the impurities blocked at the bottom of the filter plate 104 can be scraped off, preventing impurities from clogging the filter holes of the filter plate 104, so that the filter plate 104 can filter exhaust gas stably for a long time.

[0066] The scraper plate 901 has a vertical guide groove on its side that is adapted to the outward frustum column of the rotating guide ring 902. The rotating guide ring 902 is driven by the gear drive mechanism 903, which consists of a gear set and a drive element. The gear set, which is configured with the drive element, drives the rotating guide ring 902. Thus, the rotation of the rotating guide ring 902 drives the scraper plate 901 to move left and right. The scraper plate 901 also cooperates with the cross-shaped guide column inside the filter box 102 to ensure the stability of the left and right movement of the scraper plate 901.

[0067] Please see Figure 8 A method for treating urea production tail gas, using the aforementioned urea production tail gas treatment device, includes the following steps:

[0068] S1: The generated exhaust gas is introduced into the filter box 102 through the air intake channel 103. The filter plate 104 in the filter box 102 blocks solid impurities in the exhaust gas, thus completing the preliminary treatment and purification of the exhaust gas.

[0069] S2: The exhaust gas filtered by the filter plate 104 enters the inlet pipe 105 through the connecting channel 106 and the one-way inlet valve 107. Then, the exhaust gas introduced by the inlet pipe 105 and the liquid inside the treatment box 101 are fully mixed through the inlet pipe 105 and the mixing component.

[0070] S3: The exhaust gas is further treated and purified by reacting and mixing with the liquid inside the treatment box 101. After that, the treated exhaust gas is detected by the discharge component and the extraction component.

[0071] S4: Based on the detection results of the waste gas after the reaction, the waste gas is directly discharged or transferred through the discharge component and the extraction component to complete the discharge of qualified waste gas and the re-transfer treatment of unqualified waste gas.

[0072] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A urea production tail gas treatment device, comprising a treatment box, a filter box, an air inlet channel, and a filter plate, wherein the filter box is disposed on one side of the treatment box, the air inlet channel is fixedly installed on one side of the filter box, and the filter plate is fixedly installed inside the filter box, characterized in that, It also includes processing components; The processing assembly includes an inlet pipe, a connecting channel, a one-way inlet valve, a mixing component, a discharge component, and an extraction component. The inlet pipe is fixedly installed on the processing box. The connecting channel is connected to the inlet pipe and the filter box on both sides, respectively. The one-way inlet valve is installed on the connecting channel. The mixing component is connected to the processing box and is used to treat the waste gas introduced into the processing box. The discharge component is connected to the processing box and is used to export the treated gas. The extraction component is connected to the processing box and is used to assist in the discharge of gas inside the processing box. The discharge component includes a one-way discharge valve, a discharge pipe rack, a mounting plug, and a flow control component. The one-way discharge valve is installed inside the treatment box. The discharge pipe rack is connected to the one-way discharge valve and fixedly installed on one side of the treatment box. The discharge pipe rack has a total of five ports: up, down, front, back, and left. The outlet port of the one-way discharge valve communicates with the left port of the discharge pipe rack. The mounting plug is installed on the front port of the discharge pipe rack. The flow control component is connected to the discharge pipe rack and is used to control the gas flow within the discharge pipe rack. The extraction component includes an extraction box, an extraction plug holder, an extraction cylinder, and a gas sensing mechanism. The extraction box is connected to one of the connectors of the discharge pipe rack and is fixedly installed on one side of the processing box. The extraction plug holder is connected to the extraction box. The output end of the extraction cylinder is connected to the extraction plug holder and is fixedly installed on one side of the processing box. The gas sensing mechanism is installed on the side of the discharge pipe rack near the extraction box and is used to measure the gas composition entering the extraction box. The flow control component includes a guide tube slide, a screw moving mechanism, an inner discharge column, a top plug bracket, and a lifting cylinder. The guide tube slide is slidably installed inside the discharge pipe rack. The guide tube slide has two communication structures: an "L"-shaped hole and a straight hole. When the guide tube slide moves to the rightmost end, the "L"-shaped hole connects the left side interface channel of the discharge pipe rack with the bottom interface channel. When the guide tube slide moves to the leftmost end, the straight hole connects the bottom interface channel of the discharge pipe rack with the channel above the discharge pipe rack. The screw moving mechanism is connected to the discharge pipe rack and is used to drive the guide tube slide. The inner discharge column is slidably installed on the upper end of the discharge pipe rack. The device has a through-hole and two side holes at different heights. When the inner discharge column is at its highest position, the rear side hole of the inner discharge column aligns with the rear interface channel of the discharge pipe rack. When the inner discharge column is at its middle height, the front side hole of the inner discharge column aligns with the front interface channel of the discharge pipe rack. When the inner discharge column is lowered to its lowest point, the through-hole of the discharge pipe rack disengages from the top plug, allowing gas at the bottom of the discharge pipe rack to be discharged directly from the top interface channel of the discharge pipe rack. The top plug is fixedly installed on the side of the discharge pipe rack near the inner discharge column. The output end of the lifting cylinder is connected to the inner discharge column, and the lifting cylinder is fixedly installed on one side of the discharge pipe rack. The processing assembly further includes an inlet detection mechanism, an inlet pipe, an inlet check valve, and a cleaning component. The inlet detection mechanism is installed on the filter box; the inlet pipe is connected to the connecting channel and to the discharge pipe rack through a corresponding pipe; the inlet check valve is installed on the inlet pipe; and the cleaning component is connected to the filter box for cleaning the filter plates inside the filter box.

2. The urea production tail gas treatment device as described in claim 1, characterized in that, The hybrid component includes a connecting bracket, a sinking jet ejector, a lead screw adjustment mechanism, a sensing and control component, and a partition component. The connecting bracket is fixedly installed inside the processing tank. The sinking jet ejector is slidably installed on the connecting bracket and connected to the inlet pipe. The lead screw adjustment mechanism is connected to the processing tank and is used to drive the sinking jet ejector. The sensing and control component is connected to the processing tank and is used to adjust the working condition of the liquid inside the processing tank. The partition component is connected to the processing tank and is used to separate the liquid inside the processing tank.

3. The urea production tail gas treatment device as described in claim 2, characterized in that, The sensing and control components include a water level sensor and a heating mechanism. The water level sensor is fixedly installed inside the processing tank; the heating mechanism is installed on the processing tank and is used to heat the liquid inside the processing tank.

4. The urea production tail gas treatment device as described in claim 2, characterized in that, The partition component includes a perforated bottom cover, a shielding bracket, and a retaining spring. The perforated bottom cover is fixedly installed at the bottom of the sinking jet frame; the shielding bracket is slidably installed inside the processing box; and the two sides of the retaining spring are respectively connected to the shielding bracket and the processing box.

5. The urea production tail gas treatment device as described in claim 1, characterized in that, The cleaning component includes a scraper, a rotating guide ring, and a gear drive mechanism. The scraper is slidably installed inside the filter box. The rotating guide ring is connected to the scraper and rotatably installed on one side of the filter box. The gear drive mechanism is connected to the filter box and is used to drive the rotating guide ring.

6. A method for treating urea production tail gas, using the urea production tail gas treatment device as described in claim 1, characterized in that, Includes the following steps, The generated exhaust gas is introduced into the filter box through the air intake channel. The filter plate in the filter box blocks solid impurities in the exhaust gas, thus completing the preliminary treatment and purification of the exhaust gas. The exhaust gas filtered by the filter plate enters the inlet pipe through the connecting channel and the one-way inlet valve. Then, the exhaust gas introduced by the inlet pipe and the mixing component are fully mixed with the liquid inside the treatment tank. The exhaust gas is further treated and purified by reacting and mixing with the liquid inside the treatment tank. After that, the treated exhaust gas is detected by the discharge component and the extraction component. Based on the detection results of the waste gas after the reaction, the waste gas is directly discharged or transferred through the discharge component and the extraction component, thereby completing the discharge of qualified waste gas and the re-transfer treatment of non-compliant waste gas.

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