Urea large particle tail gas treatment device and method

Abstract

The present application provides a device and method for treating tail gas of large urea particles, and relates to the field of environmental protection treatment of tail gas of urea production. The device and method for treating tail gas of large urea particles include: a base, a fixed cylinder is fixedly connected to the center of the top of the base, and a side frame is fixedly connected to the side of the fixed cylinder away from the base; a water storage bottom tank is fixedly connected to the four sides of the top of the base, and an exhaust top tank is arranged above the water storage bottom tank, and the inner cavity of the fixed cylinder is provided with a spray assembly used in conjunction with the exhaust top tank and the water storage bottom tank; a water supply assembly used in conjunction with the spray assembly is arranged at the outer end of the water storage bottom tank, and an air distribution assembly is arranged in the inner cavity of the exhaust top tank and the water storage bottom tank. The device and method for treating tail gas of large urea particles, from the perspective of water saving, realizes high-pressure cyclone jet air distribution, reciprocating lifting spray purification and dynamic filtration effects on harmful tail gas generated during urea production, and reaches ultra-clean treatment standards.

Description

Technical Field

[0001] The present application relates to the technical field of environmental protection treatment of urea production tail gas, and specifically, to a device and method for treating large urea particle tail gas. Background Art

[0002] Urea is an organic compound composed of carbon, nitrogen, oxygen and hydrogen. It is a white crystal and one of the simplest organic compounds. It is the main nitrogen-containing end product of protein metabolism and decomposition in mammals and some fish. As a neutral fertilizer, urea is suitable for various soils and plants. It is easy to store, convenient to use, and has little destructive effect on the soil. It is a chemical nitrogen fertilizer with a large usage.

[0003] In the prior art (the announcement number is CN220345398U, and the patent name is a patent application for a large-particle urea granulation tail gas ultra-clean treatment device), the structure is simple, the system resistance is small, the ammonia removal efficiency is high, the energy consumption is low, the equipment investment is small, the operation and control are simple, and the maintenance cost is low. In the process of implementing this technical solution, it is found that there are at least the following problems in the prior art.

[0004] During the production of urea, harmful exhaust gas is generated due to the chemical reaction between the raw materials. Currently, most of the treatment measures for harmful exhaust gas generated during urea production use a multi-channel spray system to spray and purify the exhaust gas, which not only complicates the installation and matching of the spray system structure and is costly, but also causes a waste of water resources. Summary of the invention

[0005] The present application aims to at least solve the technical problem that the prior art cannot achieve high-pressure cyclone jet distribution, reciprocating lifting spray purification and dynamic filtration effects on harmful tail gas generated during urea production from the perspective of water saving, and cannot meet the ultra-clean treatment standard. To this end, the present application proposes a device and method for treating large urea particle tail gas.

[0006] The urea large particle tail gas treatment device according to the embodiment of the present application comprises: a base, a fixing cylinder is fixedly connected to the center of the top of the base, and a side frame is fixedly connected to the side of the fixing cylinder away from the base;

[0007] The top of the base is fixedly connected with a water storage bottom tank all around, and an exhaust top tank is arranged above the water storage bottom tank, the inner cavity of the fixed cylinder is provided with a spray assembly used in conjunction with the exhaust top tank and the water storage bottom tank, and the spray assembly includes a double-headed motor fixed between the base and the fixed cylinder, an output shaft of the double-headed motor is fixedly connected with a reciprocating screw, and the surface of the reciprocating screw is threadedly connected with a screw sleeve, the outer side of the screw sleeve is fixedly connected with a connecting piece, and the outer side of the connecting piece is fixedly connected with an annular spray frame, the upper and lower ends of the annular spray frame are fixedly connected with a telescopic sleeve that is connected and cooperated with the exhaust top tank and the water storage bottom tank, and the four ends of the inner cavity of the annular spray frame are connected with high-pressure spray heads, and the spraying direction of the high-pressure spray heads is distributed in an inclined symmetrical state along the horizontal axis of the annular spray frame;

[0008] The outer end of the water storage bottom tank is provided with a water supply assembly used in conjunction with the spray assembly, and the inner cavity of the exhaust top tank and the water storage bottom tank is provided with an air distribution assembly, the top of the exhaust top tank is connected with an exhaust pipe used in conjunction with a spoiler fan, and the inner end of the exhaust pipe is connected with a filter cartridge, the inner cavity of the side frame is provided with a filter assembly used in conjunction with the filter cartridge, and the filter assembly includes an active bevel gear fixed to the top of the reciprocating screw rod, one side of the active bevel gear is meshed with a driven bevel gear, and the side of the driven bevel gear away from the active bevel gear is fixedly connected to a cam through a fixing rod, a rotating wheel is rollingly connected to the cam, and the top of the rotating wheel is fixedly connected to a sliding rod slidably matched with the filter cartridge, the sliding rod is slidably connected to a sliding sleeve fixedly matched with the side frame, and the lower surface of the sliding rod is provided with a return spring fixedly matched with the sliding sleeve and the rotating wheel, and the other end of the sliding rod is fixedly connected to a filter frame slidably matched with the filter cartridge.

[0009] Preferably, the water supply assembly includes a three-way joint connected to the outer end of the water storage tank, and one water inlet of the three-way joint is connected to a water injection head, the water outlet of the three-way joint is connected to a circulation pump fixedly matched with the base, and the water outlet of the circulation pump is connected to a boosting valve, the top end of the boosting valve is connected to a telescopic tube, and the top end of the telescopic tube is connected to the three-way valve, both ends of the three-way valve are connected to water injection pipes, and the end of the water injection pipe away from the three-way valve is connected to the annular spray rack.

[0010] Preferably, the air distribution assembly includes a driving circular gear fixed on the other output shaft of the double-headed motor, and the driving circular gear is meshed with driven circular gears on all four sides, the inner cavity of the driven circular gear is fixedly connected to a hollow tube that rotates with the exhaust top tank and the water storage bottom tank, and the four ends of the hollow tube are sequentially connected to the air distribution disk from top to bottom, the four ends of the air distribution disk are provided with injection holes, and the bottom end of the hollow tube is connected to a connecting end, and the outer end of the connecting end is rotatably connected to a rotating end.

[0011] Preferably, vertical grooves slidably matched with the connecting parts are provided on all sides of the fixed cylinder, and slides are fixedly connected on all sides of the outer ends of the exhaust top tank and the water storage bottom tank, and a sliding seat slidably connected to the slide that is fixedly matched with the annular spray frame and the three-way valve.

[0012] Preferably, a flow sensor is embedded in one end of the three-way joint away from the water injection head, and another water inlet of the three-way joint close to the water injection head is connected to a reflux pipe that is connected to and cooperates with the water storage tank, and an activated carbon frame is embedded in the inner cavity of the reflux pipe.

[0013] Preferably, the four ends of the hollow tube close to the water storage bottom tank are fixedly connected with a stirring frame and a spoiler frame in sequence from top to bottom, and the stirring frame and the spoiler frame are provided with mixing grooves, and the top end of the hollow tube is fixedly connected with a spoiler fan used in conjunction with the exhaust top tank through a fixing rod.

[0014] Preferably, a four-way joint is fixedly connected at the center of the bottom of the base, and the air inlet of the four-way joint is connected to a gas injection head, and the air outlet of the four-way joint is connected to a gas injection pipe that is connected and matched with the rotating end.

[0015] Preferably, the top of the reciprocating screw rod is fixedly connected to an exhaust fan used in conjunction with the filter cartridge via a fixing rod, and exhaust grooves are provided around the top of the filter cartridge, and a flow equalizing net is embedded in the exhaust grooves.

[0016] The method for treating tail gas from large urea particles, according to the device for treating tail gas from large urea particles, comprises the following steps:

[0017] Step 1: First, control the double-headed motor and the circulating pump to start, the double-headed motor drives the reciprocating screw to rotate, the reciprocating screw drives the screw sleeve to move up and down, the screw sleeve drives the three sets of connecting parts to slide up and down in the vertical groove on the fixed cylinder, the three sets of slides and slide seats provide sliding support for the three sets of annular spray racks, the three sets of connecting parts drive the three sets of annular spray racks to slide up and down, the three sets of annular spray racks drive the inclined and symmetrically distributed high-pressure spray heads to move back and forth in the area between the three sets of exhaust top tanks and the water storage bottom tanks;

[0018] Step 2, the water source is supplied into the three-way joint through three sets of external booster water pipes through three sets of water injection heads, and the flow rate of the externally supplied water source is detected by three sets of flow sensors. The water source supplied into the three-way joint is pressurized again by three sets of circulating pumps through three sets of booster valves, and then supplied into three sets of telescopic pipes that reciprocate and extend following the three sets of annular spray racks. After the water source is divided into three groups through three sets of three-way valves and supplied into three sets of water injection pipes, the pressurized water source is then supplied into the three sets of annular spray racks that reciprocate and lift, and is sprayed out at high pressure by the high-pressure spray head that follows the reciprocating and lifting movement, and the high-pressure spray range of the high-pressure spray head is larger than the spray range of the tail gas in the air distribution disk on the hollow tube;

[0019] Step 3, at the same time, the external exhaust gas is pressurized and supplied into the four-way joint through the gas injection head, and then supplied into the three groups of hollow tubes through the rotating ends and the connecting ends on the three groups of gas injection pipes, and the double-headed motor drives the reciprocating screw to rotate, and also drives the driving circular gear to rotate synchronously, and the driving circular gear drives the hollow tubes on the three groups of driven circular gears to rotate accordingly, and the exhaust gas in the three groups of hollow tubes in the rotating state is swirled out through the injection holes on the three groups of gas distribution disks, and the exhaust gas sprayed out by the swirling flow is evenly and comprehensively distributed in the closed cavity composed of the three groups of telescopic sleeves, the exhaust top tank and the water storage bottom tank, and at the same time, the high-pressure water sprayed by the reciprocating high-pressure spray head performs uniform and comprehensive spray purification and sedimentation treatment on the exhaust gas sprayed out by the swirling flow until the exhaust gas is completely sprayed and purified;

[0020] Step 4: During the spray purification and sedimentation of tail gas, the waste water formed is accumulated in three groups of water storage tanks, and the purifier is added to the three groups of water storage tanks in advance. At the same time, the three groups of stirring racks and spoiler racks that rotate synchronously with the three groups of hollow pipes stir the waste water and the purifier in the three groups of water storage tanks, so that the waste water in the three groups of water storage tanks is purified and filtered by the activated carbon racks in the three groups of reflux pipes, and then flows back to the three-way joint. After the three groups of circulating pumps pressurize the purified and filtered waste water clear liquid into the three groups of annular spray racks, the three groups of high-pressure spray heads perform a reciprocating lifting spray operation on the tail gas ejected by the swirl flow, saving water resources;

[0021] Step 5. The clean gas after spray purification rises to the three groups of exhaust top tanks, and the turbulent fans that rotate synchronously with the three groups of hollow tubes blow the clean gas gathered in the three groups of exhaust top tanks upward. Then, the clean gas in the three groups of exhaust top tanks is blown by the three groups of turbulent fans, and then quickly reaches the filter cartridge through the three groups of exhaust pipes and gathers. Then, the exhaust fan that rotates synchronously with the reciprocating screw quickly discharges the clean gas gathered in the filter cartridge from bottom to top to the exhaust groove area, and then is evenly discharged after being treated by the three groups of equal flow nets to prevent the clean gas from being retained and turbulent in the three groups of exhaust top tanks and the filter cartridge.

[0022] The beneficial effects of the present application are as follows: during the treatment of harmful tail gas generated during urea production, a unified driving source is first provided by a double-headed motor, and the reciprocating lifting and lowering of the reciprocating screw and the screw sleeve are coordinated, and after the three sets of telescopic sleeves form a closed space for the areas between the three sets of exhaust top tanks and the water storage bottom tanks, the three sets of connecting parts drive the three sets of annular spray racks and high-pressure spray heads to use reciprocating lifting spray purification treatment for the tail gas distributed in the closed space, simplifying the spray system while also expanding the spray area of ​​the tail gas, spraying and settling the particulate dust in the tail gas, and then, the three sets of circulating pumps are used to pump the water injected into the water injection head and the three-way joint through the three sets of increasing pressure. After the pressure valve booster treatment, the wastewater is supplied to three groups of reciprocating annular spray racks through three groups of telescopic pipes, three-way valves and water injection pipes. At the same time, three groups of reflux pipes, activated carbon racks, stirring racks and spoiler racks purify and collect the settled wastewater in the three water storage tanks, so that the wastewater can be reused and water resources can be saved. Then, the driving circular gear and three groups of driven circular gears are coordinated, and the exhaust gas is evenly and comprehensively distributed in the confined space through three groups of hollow pipes, air distribution plates and injection holes by using a swirl injection method. Combined with the reciprocating lifting spray method, an ultra-clean treatment effect with full-range high coverage is achieved for the exhaust gas.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of a urea large particle tail gas treatment device according to an embodiment of the present application;

[0026] Figure 2 This is a three-dimensional structural working state diagram of a large urea particle tail gas treatment device according to an embodiment of the present application;

[0027] Figure 3 is a top cross-sectional view of the three-dimensional structure of a large urea particle tail gas treatment device according to an embodiment of the present application;

[0028] Figure 4 is a bottom-up cross-sectional view of the three-dimensional structure of a large-particle urea tail gas treatment device according to an embodiment of the present application;

[0029] Figure 5This is a front view of the structure of the spray assembly and the water supply assembly according to an embodiment of the present application;

[0030] Figure 6 is a partial bottom view of the structure of the spray assembly and the water supply assembly according to an embodiment of the present application;

[0031] Figure 7 This is a front view of the structure of the air distribution assembly according to an embodiment of the present application;

[0032] Figure 8 is a bottom exploded view of the air distribution assembly structure according to an embodiment of the present application;

[0033] Fig. 9 is a top view of a cross-connector, a gas injection head and a gas injection pipe structure according to an embodiment of the present application;

[0034] Fig.10 It is a partial top view of the structure of the water supply assembly, the air distribution assembly, the water storage tank, the stirring frame and the spoiler frame according to an embodiment of the present application;

[0035] Fig.11 It is a front cross-sectional view of the side frame, filter cartridge, spray assembly and filter assembly structure according to an embodiment of the present application;

[0036] Fig.12 is a bottom view of the spray assembly and filter assembly structure according to an embodiment of the present application;

[0037] Fig.13 is a side exploded view of the filter assembly structure according to an embodiment of the present application;

[0038] Fig.14 It is a partial front view of the exhaust top tank, water storage bottom tank, filter cartridge and water supply assembly structure according to an embodiment of the present application;

[0039] Fig.15 It is a rear view of the base, double-head motor, fixed cylinder and side frame structure according to an embodiment of the present application.

[0040] Icons: 1. Base; 2. Fixed cylinder; 3. Side frame; 4. Exhaust top tank; 5. Water storage bottom tank; 6. Spray assembly; 61. Double-head motor; 62. Reciprocating screw; 63. Screw sleeve; 64. Connector; 65. Annular spray rack; 66. Telescopic sleeve; 67. High-pressure spray head; 7. Water supply assembly; 71. Three-way joint; 72. Water injection head; 73. Circulation pump; 74. Booster valve; 75. Telescopic pipe; 76. Three-way valve; 77. Water injection pipe; 8. Air distribution assembly; 81. Driving circular gear; 82. Driven circular gear; 83. Hollow pipe; 84. Air distribution disc; 85. Spray Perforation; 86, connecting end; 87, rotating end; 9, filter assembly; 91, active bevel gear; 92, driven bevel gear; 93, cam; 94, rotating wheel; 95, slide rod; 96, sleeve; 97, return spring; 98, filter frame; 10, vertical slot; 11, slide frame; 12, slide seat; 13, flow sensor; 14, reflux pipe; 15, activated carbon frame; 16, stirring frame; 17, spoiler frame; 18, four-way joint; 19, gas injection head; 20, gas injection pipe; 21, spoiler fan; 22, exhaust pipe; 23, filter cartridge; 24, exhaust fan; 25, flow equalization net. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0042] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] like Figure 1-Figure 15 As shown, the urea large particle tail gas treatment device according to the embodiment of the present application includes: a base 1, a fixed cylinder 2 is fixedly connected to the center of the top of the base 1, and a side frame 3 is fixedly connected to the side of the fixed cylinder 2 away from the base 1, and a PLC controller is fixedly connected to the side frame 3;

[0049] The top of the base 1 is fixedly connected with a water storage bottom tank 5 on all sides, and an exhaust top tank 4 is arranged above the water storage bottom tank 5. The inner cavity of the fixed cylinder 2 is provided with a spray assembly 6 used in conjunction with the exhaust top tank 4 and the water storage bottom tank 5, and the spray assembly 6 includes a double-headed motor 61 fixed between the base 1 and the fixed cylinder 2. The double-headed motor 61 provides a unified driving source, which saves driving costs, simplifies the spraying system, and also expands the spraying area of ​​the exhaust gas, so as to spray and settle the particulate dust in the exhaust gas;

[0050] The outer end of the water storage bottom tank 5 is provided with a water supply component 7 used in conjunction with the spray component 6, and the inner cavity of the exhaust top tank 4 and the water storage bottom tank 5 is provided with an air distribution component 8. The exhaust gas is distributed evenly and comprehensively in the confined space by adopting a swirl jet air distribution method, which is combined with a reciprocating lifting spray method to achieve an ultra-clean treatment effect with full-range high coverage for the exhaust gas.

[0051] like Figures 5 to 10 As shown, one output shaft of the double-headed motor 61 is fixedly connected to a reciprocating screw 62, and the surface of the reciprocating screw 62 is threadedly connected to a screw sleeve 63, the double-headed motor 61 provides a unified driving source, and the reciprocating screw 62 and the screw sleeve 63 are reciprocatingly lifted and lowered, the outer side of the screw sleeve 63 is fixedly connected to a connecting piece 64, and the outer side of the connecting piece 64 is fixedly connected to an annular spray frame 65, the upper and lower ends of the annular spray frame 65 are fixedly connected to a telescopic sleeve 66 that is connected and matched with the exhaust top tank 4 and the water storage bottom tank 5, and the inner side of the annular spray frame 65 is fixedly connected to the exhaust top tank 4 and the water storage bottom tank 5. The four ends of the cavity are all connected with high-pressure spray heads 67. The spraying direction of the high-pressure spray heads 67 is distributed in an inclined symmetrical state along the horizontal axis of the annular spray frame 65. After the three groups of telescopic sleeves 66 form a closed space for the area between the three groups of exhaust top tanks 4 and the water storage bottom tank 5, the three groups of connecting parts 64 drive the three groups of annular spray frames 65 and the high-pressure spray heads 67 to use reciprocating lifting spray purification treatment for the exhaust gas distributed in the closed space, which simplifies the spray system while expanding the spray area of ​​the exhaust gas, and sprays and settles the particulate dust in the exhaust gas.

[0052] The water supply assembly 7 includes a three-way joint 71 connected to the outer end of the water storage tank 5, and one water inlet of the three-way joint 71 is connected to a water injection head 72, the water outlet of the three-way joint 71 is connected to a circulation pump 73 fixedly matched with the base 1, and the water outlet of the circulation pump 73 is connected to a booster valve 74, and the water injected into the water injection head 72 and the three-way joint 71 by the three groups of circulation pumps 73 is pressurized through the three groups of booster valves 74, the top of the booster valve 74 is connected to a telescopic pipe 75, and the top of the telescopic pipe 75 is connected to a three-way valve 76, both ends of the three-way valve 76 are connected to a water injection pipe 77, and the end of the water injection pipe 77 away from the three-way valve 76 is connected to the annular spray rack 65, and then supplied to the three groups of reciprocating lifting and lowering annular spray racks 65 through the three groups of telescopic pipes 75, the three-way valve 76 and the water injection pipe 77, so as to provide a boosted water source supply for the three groups of annular spray racks 65;

[0053] The fixing cylinder 2 is provided with vertical grooves 10 that are slidably matched with the connecting member 64, which play a role of sliding limit for the connecting member 64, which is conducive to the smooth lifting and sliding of the connecting member 64, and the outer ends of the exhaust top tank 4 and the water storage bottom tank 5 are fixedly connected with slides 11 around the four sides, and the slides 11 are slidably connected with the slide seats 12 that are fixedly matched with the annular spray frame 65 and the three-way valve 76, which play a role of sliding limit and bearing for the annular spray frame 65 and the three-way valve 76, which is conducive to the stable lifting of the annular spray frame 65, and also drives the three-way valve 76 to follow the lifting;

[0054] A flow sensor 13 is embedded in one end of the three-way joint 71 away from the water injection head 72 to detect the amount of water added, and the other water inlet of the three-way joint 71 close to the water injection head 72 is connected to a reflux pipe 14 connected and coordinated with the water storage tank 5, so that the purified wastewater in the water storage tank 5 is refluxed and collected, and an activated carbon rack 15 is embedded in the inner cavity of the reflux pipe 14 to filter the refluxed and collected wastewater again to make the wastewater reach the usable standard, thereby playing a water-saving role in the reuse of wastewater.

[0055] The air distribution component 8 includes a driving circular gear 81 fixed on the other output shaft of the double-headed motor 61, and the driving circular gear 81 is meshed with driven circular gears 82 on all sides. The driving circular gear 81 and the three groups of driven circular gears 82 are matched by transmission. The inner cavity of the driven circular gear 82 is fixedly connected with a hollow tube 83 that rotates with the exhaust top tank 4 and the water storage bottom tank 5, and the four ends of the hollow tube 83 are connected with the air distribution disk 84 in sequence from top to bottom. The four ends of the air distribution disk 84 are provided with injection holes 85. Through the three groups of hollow tubes 83 The exhaust gas is evenly and comprehensively distributed in the confined space by the air distribution plate 84 and the injection hole 85, and the exhaust gas is evenly and comprehensively distributed in the confined space. Combined with the reciprocating lifting spraying method, the exhaust gas is ultra-cleaned with a full range of high coverage. The bottom end of the hollow tube 83 is connected to a connecting end 86, and the outer end of the connecting end 86 is rotatably connected to a rotating end 87. The connecting end 86 can not only rotate in the rotating end 87, but the connecting end 86 and the rotating end 87 are also in a mutually connected state, which is beneficial to the transportation of the exhaust gas.

[0056] The four ends of the hollow tube 83 close to the water storage bottom tank 5 are fixedly connected with stirring racks 16 and spoiler racks 17 from top to bottom in sequence, and the stirring racks 16 and spoiler racks 17 are provided with mixing slots to purify and stir the wastewater settled in the water storage bottom tank 5, so that the wastewater and the purifier react fully and the wastewater is converted into a usable water source. The top of the hollow tube 83 is fixedly connected with a spoiler fan 21 used in conjunction with the exhaust top tank 4 through a fixed rod, and the clean gas floating in the exhaust top tank 4 after spray purification is blown upward by spoiler flow to prevent the clean gas from clogging and being retained in the exhaust top tank 4;

[0057] A four-way joint 18 is fixedly connected at the center of the bottom of the base 1, and the air inlet of the four-way joint 18 is connected to a gas injection head 19, and the air outlet of the four-way joint 18 is connected to a gas injection pipe 20 connected and matched with the rotating end 87. The tail gas is pressurized and supplied into the three groups of hollow tubes 83 by a zoned gas injection method to prevent the tail gas from clogging;

[0058] The top of the exhaust top tank 4 is connected to an exhaust pipe 22 used in conjunction with a turbulent fan 21, and the inner end of the exhaust pipe 22 is connected to a filter cartridge 23. The clean gas sprayed and purified in the exhaust top tank 4 is blown into the exhaust pipe 22 by the turbulent flow of the turbulent fan 21, and then gathered in the filter cartridge 23. The top of the reciprocating screw rod 62 is fixedly connected to the exhaust fan 24 used in conjunction with the filter cartridge 23 through a fixed rod, and the clean gas accumulated in the bottom area of ​​the filter cartridge 23 is discharged upward, and exhaust grooves are opened around the top of the filter cartridge 23, and a flow equalization net 25 is embedded in the exhaust groove to discharge the clean gas after flow equalization treatment.

[0059] like Figures 11 to 13 As shown, during the treatment of harmful exhaust gas generated during urea production, a fixed filter is mostly used to statically filter the particulate dust in the exhaust gas. Over time, the particulate dust is accumulated in the mesh of the filter, which not only requires frequent cleaning of the filter, but also leads to unsatisfactory exhaust gas filtering effect. The inner cavity of the side frame 3 is provided with a filter assembly 9 used in conjunction with the filter cartridge 23, and the filter assembly 9 includes an active bevel gear 91 fixed to the top of the reciprocating screw 62, a driven bevel gear 92 is meshed on one side of the active bevel gear 91, and a cam 93 is fixedly connected to the side of the driven bevel gear 92 away from the active bevel gear 91 through a fixed rod, and a rotating wheel 94 is rollingly connected to the cam 93, and the active bevel gear 91 that rotates synchronously with the reciprocating screw 62 drives the driven bevel gear 92 to rotate accordingly, and the driven bevel gear 92 drives the cam 93 to rotate through the fixed rod, and the cam 93 drives the rotating wheel 94 to reciprocate and rise and fall accordingly;

[0060] The top of the rotating wheel 94 is fixedly connected with a sliding rod 95 that slidably cooperates with the filter cartridge 23, and the sliding rod 95 is slidably connected with a sliding sleeve 96 that is fixedly cooperated with the side frame 3, and the lower surface of the sliding rod 95 is sleeved with a return spring 97 that is fixedly cooperated with the sliding sleeve 96 and the rotating wheel 94, and the other end of the sliding rod 95 is fixedly connected with a filter frame 98 that slidably cooperates with the filter cartridge 23. The return spring 97 plays an elastic buffering and return compensation role for the sliding rod 95. The rotating wheel 94 that reciprocates in lifting and lowering action drives the sliding rod 95 to reciprocate in the sliding sleeve 96, and the sliding rod 95 drives the filter frame 98 to perform reciprocating dynamic filtration in the filter cartridge 23, and the clean gas accumulated in the filter cartridge 23 is dynamically filtered again, completing the final ultra-clean treatment of the exhaust gas.

[0061] The method for treating tail gas from large urea particles is based on the device for treating tail gas from large urea particles, and comprises the following steps:

[0062] Step 1, first control the double-headed motor 61 and the circulating pump 73 to start, the double-headed motor 61 drives the reciprocating screw 62 to rotate, the reciprocating screw 62 drives the screw sleeve 63 to move up and down, the screw sleeve 63 drives the three groups of connecting parts 64 to slide up and down in the vertical groove 10 on the fixed cylinder 2, and the three groups of slides 11 and the slide seat 12 provide sliding support for the three groups of annular spray racks 65, then the three groups of connecting parts 64 drive the three groups of annular spray racks 65 to slide up and down, and the three groups of annular spray racks 65 cooperate with the telescopic sleeves 66 that follow the three groups of annular spray racks 65 to telescope up and down, then the three groups of annular spray racks 65 drive the obliquely symmetrically distributed high-pressure spray heads 67 to reciprocate and lift in the area between the three groups of exhaust top tanks 4 and the water storage bottom tanks 5;

[0063] Step 2, the water source is supplied into the three-way joint 71 through three sets of external boosting water pipes through three sets of water injection heads 72, and after the three sets of flow sensors 13 detect the flow of the externally supplied water source, the three sets of circulating pumps 73 pressurize the water source supplied into the three-way joint 71 through three sets of boosting valves 74 again, and then supplied into the three sets of telescopic pipes 75 that reciprocate and telescope with the three sets of annular spray racks 65, and then the water source is supplied into the three sets of water injection pipes 77 in different areas through three sets of three-way valves 76, and the pressurized water source is then supplied into the three sets of annular spray racks 65 that reciprocate and lift, and is sprayed out at high pressure by the high-pressure spray head 67 that follows the reciprocating and lifting movement, and the high-pressure spray range of the high-pressure spray head 67 is larger than the spray range of the tail gas in the air distribution plate 84 on the hollow tube 83;

[0064] Step 3, at the same time, the external tail gas is pressurized and supplied into the four-way joint 18 through the gas injection head 19, and then supplied into the three groups of hollow tubes 83 through the rotating end portions 87 and the connecting end portions 86 on the three groups of gas injection pipes 20, and the double-headed motor 61 drives the reciprocating screw 62 to rotate, and also drives the driving circular gear 81 to rotate synchronously, and the driving circular gear 81 drives the hollow tubes 83 on the three groups of driven circular gears 82 to rotate accordingly, and the tail gas in the three groups of hollow tubes 83 in the rotating state is swirled out through the injection holes 85 on the three groups of gas distribution disks 84, and the tail gas sprayed out by the swirling flow is evenly and comprehensively distributed in the closed cavity composed of the three groups of telescopic sleeves 66, the exhaust top tank 4 and the water storage bottom tank 5, and at the same time, the high-pressure water sprayed by the reciprocating high-pressure spray head 67 performs uniform and comprehensive spray purification and sedimentation treatment on the tail gas sprayed out by the swirling flow until the tail gas is completely sprayed and purified;

[0065] Step 4: During the spray purification and sedimentation of the tail gas, the waste water formed is accumulated in the three groups of water storage tanks 5, and the purifier is added to the three groups of water storage tanks 5 in advance. At the same time, the three groups of stirring racks 16 and spoiler racks 17 that rotate synchronously with the three groups of hollow tubes 83 stir the waste water and the purifier in the three groups of water storage tanks 5, so that the waste water in the three groups of water storage tanks 5 is purified, and then filtered by the activated carbon racks 15 in the three groups of reflux pipes 14, and then refluxed to the three-way joint 71, and then the three groups of circulating pumps 73 pressurized the purified and filtered waste water clear liquid into the three groups of annular spray racks 65, and then the three groups of high-pressure spray heads 67 perform a reciprocating lifting spray operation on the tail gas ejected by the swirl, saving water resources;

[0066] Step 5, the clean gas after spray purification rises to the three groups of exhaust top tanks 4, and the turbulent fan 21 rotating synchronously with the three groups of hollow tubes 83 blows the clean gas gathered in the three groups of exhaust top tanks 4 upward, so that the clean gas in the three groups of exhaust top tanks 4 is blown by the three groups of turbulent fans 21, and then quickly reaches the filter cartridge 23 through the three groups of exhaust pipes 22 and converges, and then the exhaust fan 24 rotating synchronously with the reciprocating screw 62 quickly discharges the clean gas gathered in the filter cartridge 23 from bottom to top to the exhaust slot area, and then the three groups of equalizing nets 25 are used for equalizing flow treatment and uniformly discharged to prevent the clean gas from being retained and turbulent in the three groups of exhaust top tanks 4 and the filter cartridge 23;

[0067] Step 6: When the clean gas reaches the filter cartridge 23 and gathers, the active bevel gear 91 that rotates synchronously with the reciprocating screw 62 drives the cam 93 on the driven bevel gear 92 to rotate accordingly. The cam 93 drives the slide bar 95 to perform reciprocating lifting and lowering motion through the rotating wheel 94. When the rotating wheel 94 rotates to the top dead center of the cam 93, the rotating wheel 94 drives the slide bar 95 to rise in the sliding sleeve 96 and compresses the return spring 97. The slide bar 95 drives the filter frame 98 to slide upward in the filter cartridge 23. When the rotating wheel 94 rotates to the bottom dead center of the cam 93, the sliding rod 95 drives the filter frame 98 to slide upward in the filter cartridge 23. At the dead point, the rotating wheel 94 and the sliding rod 95 lose the pushing force of the cam 93, and under the elastic restoring force of the restoring spring 97, the rotating wheel 94 is forced to slide downward along the edge of the cam 93, and the sliding rod 95 following the downward movement of the rotating wheel 94 also drives the filter frame 98 to slide downward to the initial position in the filter cartridge 23. Similarly, the reciprocatingly rising and falling filter frame 98 dynamically filters the clean gas gathered in the filter cartridge 23, and the clean gas after the reciprocating dynamic filtration is evenly discharged after being evenly flow-evened by the equalizing net 25 in the three groups of exhaust grooves.

[0068] It should be noted that the specific model specifications of the double-headed motor 61 and the circulating pump 73 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be described in detail.

[0069] The power supply and principles of the double-headed motor 61, the circulating pump 73 and various valves are clear to those skilled in the art and will not be described in detail here.

[0070] The above are only embodiments of the present application and are not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0071] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. Urea large particle tail gas treatment device, characterized in that: include: A base (1), wherein a fixing cylinder (2) is fixedly connected at the center of the top of the base (1), and a side frame (3) is fixedly connected to a side of the fixing cylinder (2) away from the base (1); The top of the base (1) is fixedly connected to a water storage tank (5) on all sides, and an exhaust tank (4) is arranged above the water storage tank (5). The inner cavity of the fixed cylinder (2) is provided with a spray assembly (6) used in conjunction with the exhaust tank (4) and the water storage tank (5), and the spray assembly (6) comprises a double-headed motor (61) fixed between the base (1) and the fixed cylinder (2), an output shaft of the double-headed motor (61) is fixedly connected to a reciprocating screw rod (62), and the surface of the reciprocating screw rod (62) is threadedly connected to a screw rod. A sleeve (63), the outer side of the screw sleeve (63) is fixedly connected to a connecting piece (64), and the outer side of the connecting piece (64) is fixedly connected to an annular spray frame (65), the upper and lower ends of the annular spray frame (65) are fixedly connected to telescopic sleeves (66) that are connected and matched with the exhaust top tank (4) and the water storage bottom tank (5), and the four ends of the inner cavity of the annular spray frame (65) are connected to high-pressure spray heads (67), and the spraying direction of the high-pressure spray heads (67) is distributed in an inclined symmetrical state along the horizontal axis of the annular spray frame (65); The outer end of the water storage bottom tank (5) is provided with a water supply assembly (7) for use with the spray assembly (6), and the inner cavities of the exhaust top tank (4) and the water storage bottom tank (5) are provided with an air distribution assembly (8), the air distribution assembly (8) comprising a driving circular gear (81) fixed on the other output shaft of the double-headed motor (61), and driven circular gears (82) are meshed around the driving circular gear (81), and the inner cavity of the driven circular gear (82) is fixedly connected to a hollow tube (83) that is rotatably matched with the exhaust top tank (4) and the water storage bottom tank (5), and the hollow tube (83) The four ends close to the water storage bottom tank (5) are sequentially fixedly connected with a stirring frame (16) and a spoiler frame (17) from top to bottom, and the stirring frame (16) and the spoiler frame (17) are provided with mixing notches. The top end of the hollow tube (83) is fixedly connected with a spoiler fan (21) used in conjunction with the exhaust top tank (4) through a fixing rod, and the four ends of the hollow tube (83) are sequentially connected with an air distribution plate (84) from top to bottom, and the four ends of the air distribution plate (84) are each provided with an injection hole (85), and the bottom end of the hollow tube (83) is connected with a connecting end (86), and the connecting end ( The outer end of the exhaust top tank (86) is rotatably connected to a rotating end portion (87), the top end of the exhaust top tank (4) is connected to an exhaust pipe (22) used in conjunction with a spoiler fan (21), and the inner end of the exhaust pipe (22) is connected to a filter cartridge (23), the inner cavity of the side frame (3) is provided with a filter assembly (9) used in conjunction with the filter cartridge (23), and the filter assembly (9) includes an active bevel gear (91) fixed to the top of the reciprocating screw rod (62), one side of the active bevel gear (91) is meshed with a driven bevel gear (92), and the driven bevel gear (92) is away from the active bevel gear ( A cam (93) is fixedly connected to one side of the filter cartridge (91) via a fixing rod, a rotating wheel (94) is rollingly connected to the cam (93), and a sliding rod (95) slidably matched with the filter cartridge (23) is fixedly connected to the top of the rotating wheel (94), a sliding sleeve (96) fixedly matched with the side frame (3) is slidably connected to the sliding rod (95), and a return spring (97) fixedly matched with the sliding sleeve (96) and the rotating wheel (94) is sleeved on the lower surface of the sliding rod (95), and the other end of the sliding rod (95) is fixedly connected to a filter frame (98) slidably matched with the filter cartridge (23).

2. The urea large particle tail gas treatment device according to claim 1 is characterized in that: The water supply assembly (7) comprises a three-way joint (71) connected to the outer end of the water storage tank (5), and a water inlet of the three-way joint (71) is connected to a water injection head (72), a water outlet of the three-way joint (71) is connected to a circulation pump (73) fixedly matched with the base (1), and a water outlet of the circulation pump (73) is connected to a booster valve (74), the top end of the booster valve (74) is connected to a telescopic pipe (75), and the top end of the telescopic pipe (75) is connected to a three-way valve (76), both ends of the three-way valve (76) are connected to a water injection pipe (77), and one end of the water injection pipe (77) away from the three-way valve (76) is connected to the annular spray frame (65).

3. The urea large particle tail gas treatment device according to claim 2 is characterized in that: The fixed cylinder (2) is provided with vertical grooves (10) slidably matched with the connecting piece (64) on all sides, and the exhaust top tank (4) and the water storage bottom tank (5) are fixedly connected with slide frames (11) on all sides of the outer ends, and the slide frames (11) are slidably connected with a slide seat (12) fixedly matched with the annular spray frame (65) and the three-way valve (76).

4. The urea large particle tail gas treatment device according to claim 3 is characterized in that: A flow sensor (13) is embedded in one end of the three-way joint (71) away from the water injection head (72), and another water inlet of the three-way joint (71) close to the water injection head (72) is connected to a return pipe (14) that is connected to and cooperates with the water storage tank (5), and an activated carbon frame (15) is embedded in the inner cavity of the return pipe (14).

5. The urea large particle tail gas treatment device according to claim 4 is characterized in that: A four-way joint (18) is fixedly connected at the center of the bottom of the base (1), and the air inlet of the four-way joint (18) is connected to an air injection head (19), and the air outlet of the four-way joint (18) is connected to an air injection pipe (20) that is connected and matched with the rotating end (87).

6. The urea large particle tail gas treatment device according to claim 5, characterized in that: An exhaust fan (24) used in conjunction with the filter cartridge (23) is fixedly connected to the top of the reciprocating screw rod (62) via a fixing rod, and exhaust grooves are provided around the top of the filter cartridge (23), and a flow equalizing net (25) is embedded in the exhaust grooves.

7. A method for treating tail gas from large urea particles, according to the device for treating tail gas from large urea particles according to claim 6, characterized in that: The steps include: Step 1: First, the double-headed motor (61) and the circulating pump (73) are controlled to start, the double-headed motor (61) drives the reciprocating screw (62) to rotate, the reciprocating screw (62) drives the screw sleeve (63) to move up and down, the screw sleeve (63) drives the three groups of connecting parts (64) to slide up and down in the vertical groove (10) on the fixed cylinder (2), the three groups of slides (11) and the slide seats (12) provide sliding support for the three groups of annular spray racks (65), the three groups of connecting parts (64) drive the three groups of annular spray racks (65) to slide up and down, the telescopic sleeves (66) that follow the three groups of annular spray racks (65) to telescope up and down cooperate, the three groups of annular spray racks (65) drive the high-pressure spray heads (67) that are obliquely symmetrically distributed to reciprocate and rise and fall in the area between the three groups of exhaust top tanks (4) and the water storage bottom tank (5); Step 2: The water source is supplied into the three-way joint (71) through three sets of external boosting water pipes through three sets of water injection heads (72), and the flow rate of the externally supplied water source is detected by three sets of flow sensors (13). The water source supplied into the three-way joint (71) is pressurized again by three sets of circulating pumps (73) through three sets of boosting valves (74), and then supplied into three sets of telescopic pipes (75) that reciprocate and extend following the three sets of annular spray racks (65). The water source is then supplied into three sets of water injection pipes (77) in a partitioned manner through three sets of three-way valves (76). The pressurized water source is then supplied into the three sets of annular spray racks (65) that reciprocate and lift, and is sprayed out at high pressure by the high-pressure spray heads (67) that follow the reciprocating and lifting movement, and the high-pressure spray range of the high-pressure spray heads (67) is larger than the spray range of the tail gas in the air distribution plate (84) on the hollow tube (83); Step 3: At the same time, the external exhaust gas is pressurized and supplied to the four-way joint (18) through the gas injection head (19), and then supplied to the three groups of hollow tubes (83) through the rotating ends (87) and the connecting ends (86) on the three groups of gas injection pipes (20). When the double-headed motor (61) drives the reciprocating screw rod (62) to rotate, it also drives the driving circular gear (81) to rotate synchronously. The driving circular gear (81) drives the hollow tubes (83) on the three groups of driven circular gears (82) to rotate accordingly. The tail gas in the three groups of hollow tubes (83) in the dynamic state is swirled out through the injection holes (85) on the three groups of gas distribution plates (84), and the swirled tail gas is evenly and comprehensively distributed in the closed cavity composed of the three groups of telescopic sleeves (66), the exhaust top tank (4) and the water storage bottom tank (5). At the same time, the high-pressure water sprayed by the reciprocating high-pressure spray head (67) performs uniform and comprehensive spray purification and sedimentation treatment on the swirled tail gas until the tail gas is completely sprayed and purified; Step 4: during the spray purification and sedimentation of the tail gas, the waste water generated is accumulated in the three groups of water storage tanks (5), and the purifier is added to the three groups of water storage tanks (5) in advance. At the same time, the three groups of stirring racks (16) and spoiler racks (17) that rotate synchronously with the three groups of hollow tubes (83) stir the waste water and the purifier in the three groups of water storage tanks (5) to make the waste water in the three groups of water storage tanks (5) be purified, and then filtered by the activated carbon racks (15) in the three groups of return pipes (14), and then flow back to the three-way joint (71). Then, the three groups of circulating pumps (73) pressurize the purified and filtered waste water clear liquid into the three groups of annular spray racks (65), and then the three groups of high-pressure spray heads (67) perform a reciprocating lifting spray operation on the tail gas ejected by the swirling flow, thereby saving water resources; Step 5: The clean gas after spray purification rises into the three groups of exhaust top tanks (4), and the turbulent fan (21) that rotates synchronously with the three groups of hollow tubes (83) blows the clean gas gathered in the three groups of exhaust top tanks (4) upward in a turbulent manner. Then, after the clean gas in the three groups of exhaust top tanks (4) is blown by the three groups of turbulent fans (21), it quickly reaches the filter cartridge (23) through the three groups of exhaust pipes (22) and converges. Then, the exhaust fan (24) that rotates synchronously with the reciprocating screw (62) quickly discharges the clean gas gathered in the filter cartridge (23) from bottom to top to the exhaust slot area, and then the three groups of equalizing nets (25) evenly discharge the clean gas after equalizing the flow, so as to prevent the clean gas from being retained and turbulent in the three groups of exhaust top tanks (4) and the filter cartridge (23).

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