Tail gas absorption device in paranitroaniline production process

Abstract

The invention discloses a tail gas absorption device in the production process of paranitroaniline, and the tail gas absorption device in the production process of paranitroaniline comprises a fixed bottom plate, a tail gas conveying assembly, a solution supplementing assembly and an automatic stirring assembly. In order to solve the problem that the absorption efficiency of the subsequent nitroaniline is reduced due to the fact that the solution is gradually saturated when the tail gas is subjected to absorption treatment, a solution supplementing assembly is designed, nitroaniline wastewater can be automatically and continuously output and purified water can be automatically and continuously supplemented through the solution supplementing assembly when the tail gas is subjected to absorption treatment; therefore, the problem that the absorption efficiency is reduced due to the fact that the solution is saturated after being absorbed for a long time is effectively avoided, the beneficial effect of automatic supplementing is achieved, further, the automatic stirring assembly is designed, hot water is continuously stirred through the arrangement of the automatic stirring assembly, and the water temperature is made to be uniform.

Description

Technical Field

[0001] The present application relates to the technical field of tail gas treatment in the production of p-nitroaniline, in particular to a tail gas absorption device in the production process of p-nitroaniline. Background Art

[0002] The tail gas from nitroaniline production is waste gas generated during the production process, which may contain a variety of harmful substances and pose a threat to the environment and human health. In order to reduce pollution to the environment and harm to human health, nitroaniline manufacturers need to take effective tail gas treatment measures and strictly abide by environmental protection requirements. When treating the tail gas, corresponding tail gas absorption equipment needs to be used.

[0003] The existing patent document "CN218011966U A tail gas absorption device in the production process of p-nitroaniline" discloses an absorption device. The absorption device in the above technical solution adopts a hot water absorption method to absorb and treat the tail gas. However, after a long period of absorption work, the hot water solution will gradually become saturated by hot water absorption. The saturated solution is difficult to subsequently absorb and treat the tail gas, resulting in a problem of reduced absorption efficiency. That is, the prior art has the following technical problems: after a long period of absorption work, the solution of the common absorption device will gradually become saturated, resulting in reduced absorption efficiency. Therefore, in view of the above problem, a tail gas absorption device in the production process of p-nitroaniline is proposed. Summary of the invention

[0004] In this embodiment, a tail gas absorption device in the production process of p-nitroaniline is provided to solve the problem that the solution of ordinary absorption devices in the prior art gradually tends to be saturated after long-term absorption, resulting in reduced absorption efficiency.

[0005] According to one aspect of the present application, a tail gas absorption device for a p-nitroaniline production process is provided, wherein the tail gas absorption device for a p-nitroaniline production process comprises: A fixed bottom plate, an absorption chamber is fixedly arranged on the upper surface of the fixed bottom plate, the inner cavity of the absorption chamber is filled with hot water, and a heating rod is fixedly installed in the inner cavity of the absorption chamber; An exhaust gas conveying component, wherein the exhaust gas conveying component is connected to the fixed bottom plate, and the exhaust gas conveying component can convey the exhaust gas to the interior of the absorption bin for absorption and purification; A solution replenishing component, the solution replenishing component comprises a wastewater output structure and a solution replenishing structure, the wastewater output structure is connected to the absorption chamber, and the solution replenishing structure is connected to the absorption chamber; the solution replenishing component can automatically discharge and replenish the solution in the absorption chamber while treating the tail gas; An automatic stirring component is fixedly arranged on the upper end of the fixed bottom plate, and the automatic stirring component can automatically rotate during tail gas treatment.

[0006] Furthermore, the exhaust gas conveying assembly includes an exhaust gas conveying pipe, a connecting circular shell, a rotating shaft, a wind wheel, a fixed shell and small holes. The exhaust gas conveying pipe is connected to the bottom side of the inner cavity of the absorption bin and is fixedly connected to the absorption bin. One end of the conveying pipe is fixedly connected to the fixed shell and communicates with the inner cavity of the fixed shell. The other end of the conveying pipe is connected to the exhaust gas conveyor, and a plurality of small holes are opened on the upper wall of the inner cavity of the fixed shell.

[0007] Furthermore, the exhaust gas delivery pipeline is fixedly connected to a connecting circular shell and communicates with the inner cavity of the connecting circular shell. A rotating shaft is rotatably connected to the inner cavity side wall of the connecting circular shell, and a plurality of wind wheels are fixedly provided on the arc wall of the rotating shaft.

[0008] Furthermore, the wastewater output structure includes a fixed support frame, a first rotating wheel, a second rotating wheel, a connecting belt, a rotating disk, a convex tooth, a fixed cylinder and a return spring, the fixed support frame is fixedly arranged on the upper surface of the fixed base plate, the first rotating wheel is arranged on the outer side wall of the connecting circular shell and is rotatably connected to the connecting circular shell, the first rotating wheel is fixedly connected to the rotating shaft, the second rotating wheel is rotatably connected at the top end of the fixed support frame, the rotating disk is rotatably connected at the top end of the fixed support frame, the second rotating wheel is fixedly connected to the rotating disk, and a connecting belt is sleeved and connected between the second rotating wheel and the first rotating wheel.

[0009] Furthermore, a plurality of convex teeth are fixedly provided on the arc-shaped wall of the rotating disk, the convex teeth are meshed with the rack, a connecting plate is fixedly connected to the bottom end of the rack, the fixed cylinder is fixedly provided on the upper surface of the fixed bottom plate, a piston is slidably connected in the inner cavity of the fixed cylinder, one end of a connecting rod is fixedly connected to the upper surface of the piston, the other end of the connecting rod passes through the upper wall of the inner cavity of the fixed cylinder and extends outside the wall, and the top end of the connecting rod is fixedly connected to the bottom surface of the connecting plate.

[0010] Furthermore, one end of the suction tube is fixedly connected to the bottom side of the inner cavity of the fixed cylinder, the other end of the suction tube extends into the inner cavity of the absorption bin and is fixedly connected to the absorption bin, one end of the discharge tube is fixedly connected to the bottom side of the inner cavity of the fixed cylinder, an output one-way valve is installed on the discharge tube, an input one-way valve is installed on the suction tube, one end of a return spring is fixedly connected to the bottom surface of the connecting plate, and the other end of the return spring is fixedly connected to the upper surface of the fixed bottom plate.

[0011] Furthermore, the automatic stirring assembly includes an exhaust gas output tube, a fixed bracket, a rotating rod, a stirring rod, a connecting column and a spiral blade. The exhaust gas output tube is fixedly arranged on the upper wall of the absorption bin, the exhaust gas output tube is connected to the inner cavity of the absorption bin, the upper end of the exhaust gas output tube is fixedly connected with a first exhaust gas output pipe, the fixed bracket is fixedly arranged in the inner cavity of the absorption bin, the fixed bracket is rotatably connected with a rotating rod, the bottom end of the rotating rod extends into the hot water in the inner cavity of the absorption bin, the bottom end of the rotating rod is fixedly arranged with a stirring rod, the top end of the rotating rod is fixedly connected with a connecting column, and the arc-shaped wall of the connecting column is fixedly arranged with a spiral blade.

[0012] Furthermore, the solution replenishing structure includes a water purification cylinder, a storage bin, a delivery pump, a delivery pipeline, a downward pressure piston, a guide rod, an end plate, a tension spring, a water purification output pipeline and a liquid level control unit. The water purification cylinder is fixedly arranged on the upper surface of the fixed bottom plate, and a downward pressure piston is slidably connected in the inner cavity of the water purification cylinder. One end of the guide rod is fixedly connected to the upper surface of the downward pressure piston, and the other end of the guide rod passes through the upper wall of the inner cavity of the water purification cylinder and extends outside the wall. The top end of the guide rod is fixedly connected to the end plate, and the bottom surface of the end plate is fixedly connected to one end of the tension spring, and the other end of the tension spring is fixedly connected to the upper surface of the water purification cylinder. One end of a clean water output pipe is fixedly connected to the bottom side of the inner cavity of the water purification cylinder, and the other end of the clean water output pipe is connected to a liquid level control unit. The liquid level control unit is arranged in the inner cavity of the absorption bin and fixedly connected to the absorption bin. The storage bin is fixedly arranged on the upper surface of the fixed bottom plate, and a delivery pump is fixedly arranged on the side wall of the storage bin. The output end of the delivery pump extends into the inner cavity of the storage bin. The output end of the delivery pump is fixedly connected to one end of a delivery pipe, and the other end of the delivery pipe extends into the inner cavity of the water purification cylinder. A one-way valve is arranged on the delivery pipe, and clean water is arranged in the inner cavity of the storage bin.

[0013] Furthermore, the liquid level control part includes a cylinder, a valve body, an output end, an input end, a closed core, a guide slider and a floating cylinder. The cylinder is fixedly arranged on the inner cavity side wall of the absorption bin, and the valve body is fixedly connected to the upper end of the cylinder. The two ends of the valve body are respectively provided with an output end and an input end, and the input end is connected to one end of the clean water output pipe. The valve body is slidably connected with a closed core, and the bottom end of the closed core is fixedly connected with a guide slider, and the bottom surface of the guide slider is fixedly connected with a floating cylinder.

[0014] Furthermore, a heat exchange pipe is fixedly arranged in the inner cavity of the water purification cylinder, one end of the heat exchange pipe is fixedly connected to one end of the first tail gas output pipe, and the other end of the heat exchange pipe is fixedly connected to the second tail gas output pipe.

[0015] Through the above-mentioned embodiments of the present application, in order to solve the problem in the prior art that, after a long period of absorption treatment of exhaust gas by ordinary hot water absorption treatment equipment, the solution will gradually reach saturation, thereby reducing the subsequent absorption efficiency of nitroaniline, the present application designs a solution replenishing component, through which the solution replenishing component can automatically and continuously output nitroaniline wastewater and replenish clean water when absorbing the exhaust gas, thereby effectively avoiding the problem of reduced absorption efficiency caused by saturation of the solution after long-term absorption, and achieving the beneficial effect of automatic replenishment. Furthermore, the present application designs an automatic stirring component, through the setting of the automatic stirring component, the hot water is continuously stirred. On the one hand, stirring can improve the absorption efficiency of nitroaniline in the exhaust gas, and on the other hand, the water temperature can be made uniform after the clean water is replenished. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 This is a schematic diagram of the front structure of an embodiment of the present application; Figure 3 This is a schematic structural diagram of an exhaust gas conveying assembly according to an embodiment of the present application; Figure 4 This is a schematic structural diagram of a wastewater output structure according to an embodiment of the present application; Figure 5 This is a schematic diagram of the overall connection of a wastewater output structure according to an embodiment of the present application; Figure 6 This is a schematic diagram of the internal structure of a fixed cylinder according to an embodiment of the present application; Figure 7 A schematic diagram of the connection of an automatic stirring component according to an embodiment of the present application; Figure 8 This is a schematic diagram of the overall structure of an automatic stirring assembly according to an embodiment of the present application; Fig. 9 This is a schematic diagram of the overall connection of a solution replenishing structure according to an embodiment of the present application; Fig.10 This is a schematic structural diagram of a liquid level control unit according to an embodiment of the present application.

[0018] In the figure: Fixed bottom plate 1, absorption chamber 2, Exhaust gas delivery component 3, exhaust gas delivery pipeline 301, connecting round shell 302, rotating shaft 303, wind wheel 304, fixed shell 305, small hole 306; Wastewater output structure 4, fixed support frame 401, first rotating wheel 402, second rotating wheel 403, connecting belt 404, rotating disk 405, convex teeth 406, rack 407, fixed cylinder 408, connecting rod 409, piston 410, connecting plate 411, return spring 412, discharge pipe 413, suction pipe 414; Automatic stirring component 5, exhaust gas output tube 501, fixed bracket 502, rotating rod 503, stirring rod 504, connecting column 505, spiral blade 506; Solution replenishing structure 6, water purification cylinder 601, storage bin 602, delivery pump 603, delivery pipeline 604, pressing piston 605, guide rod 606, end plate 607, tension spring 608, purified water output pipeline 609; Liquid level control unit 610, cylinder 6101, valve body 6102, output end 6103, input end 6104, closed core 6105, guide slider 6106, float 6107 Heat exchange pipe 611; Heating rod 7, first exhaust gas output pipe 8, second exhaust gas output pipe 9. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0020] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0021] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0022] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0023] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0024] See also Figure 1-2 As shown, the tail gas absorption device in the production process of p-nitroaniline includes: A fixed bottom plate 1, an absorption chamber 2 is fixedly arranged on the upper surface of the fixed bottom plate 1, the inner cavity of the absorption chamber 2 is filled with hot water, and a heating rod 7 is fixedly installed in the inner cavity of the absorption chamber 2; An exhaust gas conveying component 3, wherein the exhaust gas conveying component 3 is connected to the fixed bottom plate 1, and the exhaust gas conveying component 3 can convey the exhaust gas to the inside of the absorption bin 2 for absorption and purification; A solution replenishing component, the solution replenishing component comprises a wastewater output structure 4 and a solution replenishing structure 6, the wastewater output structure 4 is connected to the absorption chamber 2, and the solution replenishing structure 6 is connected to the absorption chamber 2; the solution replenishing component can automatically discharge and replenish the solution in the absorption chamber 2 while treating the tail gas; An automatic stirring component 5, which is fixedly arranged on the upper end of the fixed bottom plate 1, and can automatically rotate during the tail gas treatment; Through the above technical scheme, the solution replenishment component can automatically and continuously output nitroaniline wastewater and replenish clean water when absorbing the tail gas, thereby effectively avoiding the problem of reduced absorption efficiency caused by saturation of the solution after long-term absorption, and achieving the beneficial effect of automatic replenishment. Furthermore, the present application designs an automatic stirring component 5. Through the setting of the automatic stirring component 5, the hot water is continuously stirred. On the one hand, stirring can improve the absorption efficiency of nitroaniline in the tail gas, and on the other hand, the water temperature can be made uniform after the clean water is replenished.

[0025] For further technical solutions, see Figure 3 As shown, the exhaust gas delivery component 3 includes an exhaust gas delivery pipeline 301, a connecting circular shell 302, a rotating shaft 303, a wind wheel 304, a fixed shell 305 and a small hole 306. The exhaust gas delivery pipeline 301 is connected to the bottom side of the inner cavity of the absorption bin 2 and is fixedly connected to the absorption bin 2. One end of the delivery pipeline 301 is fixedly connected to the fixed shell 305 and communicates with the inner cavity of the fixed shell 305. The other end of the delivery pipeline 301 is connected to the exhaust gas conveyor. The upper wall of the inner cavity of the fixed shell 305 is A plurality of small holes 306 are provided at the end of the fixed shell 305. Through the technical solution, the tail gas produced during the production of p-nitroaniline is transported to the inner cavity of the fixed shell 305 through the tail gas conveying pipeline 301 by the tail gas conveyor, and then dispersed into the inner cavity of the absorption bin 2 through the small holes 306, so that the tail gas is in contact with the hot water in the inner cavity of the absorption bin 2, and the hot water is kept at a certain temperature by the setting of the heating rod 7, so that the volatile organic matter such as p-nitroaniline in the tail gas is dissolved in the hot water, thereby realizing the absorption and treatment function of the tail gas; The exhaust gas conveying pipeline 301 is fixedly connected to a connecting circular shell 302 and is communicated with the inner cavity of the connecting circular shell 302. A rotating shaft 303 is rotatably connected to the inner cavity side wall of the connecting circular shell 302. A plurality of wind wheels 304 are fixedly provided on the arc-shaped wall of the rotating shaft 303. Through the present technical solution, when the exhaust gas is transported, the exhaust gas will move through the connecting circular shell 302, and the moving airflow can continuously drive the wind wheel 304 to rotate, thereby driving the rotating shaft 303 to rotate. It can be seen from the above description that when the exhaust gas is treated, the rotating shaft 303 can be automatically rotated.

[0026] For specific technical solutions, please refer to Figure 4 , Figure 5 and Figure 6As shown, the wastewater output structure 4 includes a fixed support frame 401, a first rotating wheel 402, a second rotating wheel 403, a connecting belt 404, a rotating disk 405, a convex tooth 406, a fixed cylinder 408 and a return spring 412, wherein the fixed support frame 401 is fixedly arranged on the upper surface of the fixed bottom plate 1, the first rotating wheel 402 is arranged on the outer side wall of the connecting round shell 302 and is rotatably connected to the connecting round shell 302, the first rotating wheel 402 is fixedly connected to the rotating shaft 303, the top of the fixed support frame 401 is rotatably connected to the second rotating wheel 403, and the top of the fixed support frame 401 A rotating disk 405 is rotatably connected thereto, the second rotating wheel 403 is fixedly connected to the rotating disk 405, and a connecting belt 404 is sleeved and connected between the second rotating wheel 403 and the first rotating wheel 402. Through the technical solution, when the exhaust gas is treated, the conveyance of the exhaust gas can automatically drive the rotating shaft 303 to rotate, thereby driving the first rotating wheel 402 to rotate through the rotation of the rotating shaft 303, thereby driving the connecting belt 404 to move, thereby driving the second rotating wheel 403 to rotate, and then driving the rotating disk 405 to rotate, thereby realizing the automatic rotation function of the rotating disk 405; A plurality of convex teeth 406 are fixedly provided on the arc-shaped wall of the rotating disk 405, and the convex teeth 406 are meshed with the rack 407, and a connecting plate 411 is fixedly connected to the bottom end of the rack 407, and the fixed cylinder 408 is fixedly provided on the upper surface of the fixed bottom plate 1, and a piston 410 is slidably connected in the inner cavity of the fixed cylinder 408, and one end of a connecting rod 409 is fixedly connected to the upper surface of the piston 410, and the other end of the connecting rod 409 passes through the upper wall of the inner cavity of the fixed cylinder 408 and extends outside the wall, and the top end of the connecting rod 409 is fixedly connected to the bottom surface of the connecting plate 411. Through the technical solution, when the rotating disk 405 rotates, the convex teeth 406 can be driven to rotate, thereby driving the rack 407 to move upward, thereby driving the connecting plate 411 to move upward, and then driving the connecting rod 409 to move upward, so that the piston 410 moves upward in the inner cavity of the fixed cylinder 408; One end of a suction pipe 414 is fixedly connected to the bottom side of the inner cavity of the fixed cylinder 408, and the other end of the suction pipe 414 extends into the inner cavity of the absorption bin 2 and is fixedly connected to the absorption bin 2. One end of a discharge pipe 413 is fixedly connected to the bottom side of the inner cavity of the fixed cylinder 408, and an output check valve is installed on the discharge pipe 413. An input check valve is installed on the suction pipe 414. One end of a return spring 412 is fixedly connected to the bottom surface of the connecting plate 411. The other end of 412 is fixedly connected to the upper surface of the fixed bottom plate 1. Through the technical solution, when the exhaust gas is transported and processed, it can automatically drive the rotating disk 405 to rotate, and the rotation of the rotating disk 405 can drive the piston 410 to move upward, so that when the piston 410 moves upward in the inner cavity of the fixed cylinder 408, the fixed cylinder 408 will suck the wastewater in the inner cavity of the absorption chamber 2 through the suction pipe 414. At the same time, the upward movement of the connecting plate 411 continuously stretches the reset spring 412, so that the reset spring 412 accumulates elastic potential energy. When the convex tooth 406 rotates and moves to a certain angle, it separates from the rack 407. Since the rack 407 loses the limiting effect of the convex tooth 406, the elastic potential energy of the return spring 412 can be released, so that the rack 407 moves downward, and at the same time, the piston 410 moves downward. Through the downward movement of the piston 410, the waste water in the inner cavity of the fixed cylinder 408 can be discharged through the discharge pipe 413. After the rotating disk 405 rotates one circle, the convex tooth 406 will mesh with the rack 407 again, and the rack 407 will move upward again with the rotation, so that the above-described steps can be repeated, so that the waste water in the inner cavity of the absorption bin 2 is continuously discharged. Through the technical solution, when the exhaust gas is transported and treated, the gradually saturated waste water in the inner cavity of the absorption bin 2 can be continuously automatically discharged, and when the exhaust gas stops being fed in, the waste water output structure 4 also stops operating at the same time, realizing the automatic stop function, and no additional electrical equipment control components are required.

[0027] As a preferred technical solution, please refer to Figure 7 and Figure 8As shown, the automatic stirring component 5 includes an exhaust gas output tube 501, a fixed bracket 502, a rotating rod 503, a stirring rod 504, a connecting column 505 and a spiral blade 506. The exhaust gas output tube 501 is fixedly arranged on the upper wall of the absorption bin 2, and the exhaust gas output tube 501 is communicated with the inner cavity of the absorption bin 2. The upper end of the exhaust gas output tube 501 is fixedly connected with a first exhaust gas output pipe 8. The fixed bracket 502 is fixedly arranged in the inner cavity of the absorption bin 2. The rotating rod 503 is rotatably connected to the fixed bracket 502. The bottom end of the rotating rod 503 extends into the hot water in the inner cavity of the absorption bin 2. The stirring rod 504 is fixedly arranged at the bottom end of the rotating rod 503. The top of the rotating rod 503 is fixedly connected with a connecting column 505. The arc-shaped wall of the connecting column 505 is fixedly provided with a spiral blade 506. 06. Through the present technical solution, after the exhaust gas is absorbed and treated by hot water, the treated exhaust gas is output through the exhaust gas output tube 501 and the first exhaust gas output pipe 8. When the exhaust gas flows in the inner cavity of the exhaust gas output tube 501, the flowing airflow can drive the spiral blade 506 to rotate, thereby driving the connecting column 505 to rotate, and then the rotation of the connecting column 505 drives the rotating rod 503 to rotate, thereby driving the stirring rod 504 to rotate, and then the rotation of the stirring rod 504 can continuously stir the hot water in the inner cavity of the absorption bin 2. On the one hand, stirring can improve the absorption efficiency of nitroaniline in the exhaust gas, and on the other hand, after the clean water is supplemented, the water temperature can be made uniform. It is particularly suitable for use in hot water absorption treatment of nitroaniline production exhaust gas, and realizes the function of automatic stirring.

[0028] For further technical solutions, see Fig. 9As shown, the solution replenishing structure 6 includes a water purification cylinder 601, a storage bin 602, a delivery pump 603, a delivery pipeline 604, a downward pressure piston 605, a guide rod 606, an end plate 607, a tension spring 608, a water purification output pipeline 609 and a liquid level control unit 610. The water purification cylinder 601 is fixedly arranged on the upper surface of the fixed bottom plate 1, and the downward pressure piston 605 is slidably connected in the inner cavity of the water purification cylinder 601. One end of the guide rod 606 is fixedly connected to the upper surface of the downward pressure piston 605, and the other end of the guide rod 606 passes through the upper wall of the inner cavity of the water purification cylinder 601 and extends outside the wall. The top of the guide rod 606 is fixedly connected to the end plate 607. 7 is fixedly connected to one end of a tension spring 608, the other end of the tension spring 608 is fixedly connected to the upper surface of the water purification cylinder 601, and one end of a clean water output pipe 609 is fixedly connected to the bottom side of the inner cavity of the water purification cylinder 601, and the other end of the clean water output pipe 609 is connected to a liquid level control unit 610, and the liquid level control unit 610 is arranged in the inner cavity of the absorption bin 2 and fixedly connected to the absorption bin 2. The storage bin 602 is fixedly arranged on the upper surface of the fixed bottom plate 1, and a delivery pump 603 is fixedly arranged on the side wall of the storage bin 602. The output end of the delivery pump 603 extends into the inner cavity of the storage bin 602, and the delivery end of the delivery pump 603 extends to the inner cavity of the storage bin 602. The outlet is fixedly connected to one end of a delivery pipe 604, and the other end of the delivery pipe 604 extends into the inner cavity of the water purification cylinder 601. A one-way valve is arranged on the delivery pipe 604, and clean water is arranged in the inner cavity of the storage bin 602. Through the technical solution, the clean water in the inner cavity of the storage bin 602 can be delivered to the inner cavity of the water purification cylinder 601 through the operation of the delivery pump 603, so that the clean water is stored in the inner cavity of the water purification cylinder 601. Due to the continuous entry of clean water, the downward piston 605 is pushed to move upward, thereby driving the guide rod 606 and the end plate 607 to move upward, and then the tension spring 608 is stretched, so that the tension spring 608 stretches to generate elastic potential energy. Through this elastic potential energy, the downward pressure of the pressing piston 605 can be exerted. When the liquid level in the inner cavity of the absorption chamber 2 drops, the liquid level control unit 610 will be automatically turned on, so that the clean water in the inner cavity of the water purification cylinder 601 can be output to the inner cavity of the absorption chamber 2 through the clean water output pipe 609 by the downward pressure of the pressing piston 605, thereby realizing the function of automatically replenishing clean water and the automatic replenishment effect of the solution. Therefore, when the tail gas is continuously absorbed and treated, the problem of reduced absorption efficiency caused by the gradual saturation of the solution is effectively avoided, and the effect of automatically controlling the saturation of the solution is achieved, so that the tail gas absorption effect is better, which is particularly suitable for use in long-term tail gas absorption work; When the elastic potential energy of the stretch spring 608 is consumed, the delivery pump 603 is activated again, so that the clean water is replenished into the inner cavity of the water purification cylinder 601 again, so that the stretch spring 608 is stretched again and the elastic potential energy is accumulated again.

[0029] For specific technical solutions, please refer to Fig.10 As shown, the liquid level control unit 610 includes a cylinder 6101, a valve body 6102, an output end 6103, an input end 6104, a closed core 6105, a guide slider 6106 and a float 6107. The cylinder 6101 is fixedly arranged on the inner cavity side wall of the absorption chamber 2. The valve body 6102 is fixedly connected to the upper end of the cylinder 6101. The output end 6103 and the input end 6104 are respectively arranged at both ends of the valve body 6102. The input end 6104 is connected to the net The valve body 6102 is connected to one end of the water output pipe 609, and a closed core 6105 is slidably connected to the valve body 6102. The bottom end of the closed core 6105 is fixedly connected to a guide slider 6106, and the bottom surface of the guide slider 6106 is fixedly connected to a float 6107. According to the technical solution, when the solution in the inner cavity of the absorption chamber 2 is at a higher liquid level, the float 6107 can float at the liquid level due to the setting of the float 6107, so that the float 6107 is in a high position, so that the closed core 6105 is completely inserted into the interior of the valve body 6102, so that the valve body 6102 is in a closed state, and the clean water cannot flow through the valve body 6102. When the solution in the inner cavity of the fixed bottom plate 1 is output, the solution output will cause the liquid level to drop, and then the floating tube 6107 will drop, so that the guide slider 6106 and the closed core 6105 will drop. When the closed core 6105 moves down and separates from the inner cavity of the valve body 6102, the valve body 6102 will be connected, so that the clean water can be transported to the inner cavity of the fixed bottom plate 1 through the input end 6104 and the output end 6103, thereby realizing the function of automatic replenishment of clean water and avoiding the oversaturation of the solution in the inner cavity of the fixed bottom plate 1. With the replenishment of the solution, the liquid level rises again, and the closed core 6105 closes the valve body 6102 again, that is, the replenishment of clean water is automatically stopped. After the liquid level in the inner cavity of the fixed bottom plate 1 drops, it is replenished again, realizing the function of automatic replenishment. A heat exchange pipe 611 is fixedly arranged in the inner cavity of the water purification cylinder 601. One end of the heat exchange pipe 611 is fixedly connected to one end of the first tail gas output pipe 8, and the other end of the heat exchange pipe 611 is fixedly connected to the second tail gas output pipe 9. According to the technical solution, the tail gas after absorption will enter the inner cavity of the heat exchange pipe 611 through the first tail gas output pipe 8. Since the tail gas is absorbed and purified by hot water, the tail gas will also be heated. After the tail gas carrying heat enters the heat exchange pipe 611, it will be heated by the clean water in the water purification cylinder 601. Heat exchange is performed to preheat the clean water and cool the exhaust gas. Through the technical solution, the heat carried by the treated exhaust gas can be recovered. On the one hand, the exhaust gas after hot water absorption treatment is cooled, which is beneficial to the subsequent treatment steps. On the other hand, the residual heat of the exhaust gas is used to preheat the clean water in the inner cavity of the water purification cylinder 601. After the clean water is added to the inner cavity of the absorption bin 2, the problem of a sudden drop in the temperature of the solution in the inner cavity of the absorption bin 2 is effectively avoided, thereby improving energy utilization.

[0030] The circuits, electronic components and modules involved are all prior art and can be fully implemented by those skilled in the art, and needless to say, the content protected by this application does not involve improvements to software and methods.

[0031] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tail gas absorption device in the production process of p-nitroaniline, characterized in that: The tail gas absorption device in the production process of p-nitroaniline includes: A fixed bottom plate (1), an absorption chamber (2) being fixedly arranged on the upper surface of the fixed bottom plate (1), the inner cavity of the absorption chamber (2) being filled with hot water, and a heating rod (7) being fixedly installed in the inner cavity of the absorption chamber (2); An exhaust gas conveying component (3), the exhaust gas conveying component (3) being connected to the fixed bottom plate (1), and the exhaust gas conveying component (3) being capable of conveying the exhaust gas to the interior of the absorption bin (2) for absorption and purification; A solution replenishing component, the solution replenishing component comprising a wastewater output structure (4) and a solution replenishing structure (6), the wastewater output structure (4) being connected to the absorption chamber (2), and the solution replenishing structure (6) being connected to the absorption chamber (2); the solution replenishing component can automatically discharge and replenish the solution in the absorption chamber (2) while treating the tail gas; An automatic stirring component (5) is fixedly arranged on the upper end of the fixed bottom plate (1), and the automatic stirring component (5) can automatically rotate during tail gas treatment.

2. The tail gas absorption device in the p-nitroaniline production process according to claim 1, characterized in that: The exhaust gas conveying assembly (3) comprises an exhaust gas conveying pipeline (301), a connecting circular shell (302), a rotating shaft (303), a wind wheel (304), a fixed shell (305) and small holes (306); the exhaust gas conveying pipeline (301) is connected to the bottom side of the inner cavity of the absorption bin (2) and is fixedly connected to the absorption bin (2); one end of the conveying pipeline (301) is fixedly connected to the fixed shell (305) and communicates with the inner cavity of the fixed shell (305); the other end of the conveying pipeline (301) is connected to the exhaust gas conveyor; and a plurality of small holes (306) are provided on the upper wall of the inner cavity of the fixed shell (305).

3. The tail gas absorption device in the p-nitroaniline production process according to claim 2, characterized in that: The exhaust gas delivery pipeline (301) is fixedly connected to a connecting circular shell (302) and communicates with the inner cavity of the connecting circular shell (302). A rotating shaft (303) is rotatably connected to the inner cavity side wall of the connecting circular shell (302). A plurality of wind wheels (304) are fixedly arranged on the arc-shaped wall of the rotating shaft (303).

4. The tail gas absorption device in the p-nitroaniline production process according to claim 1, characterized in that: The wastewater output structure (4) comprises a fixed support frame (401), a first rotating wheel (402), a second rotating wheel (403), a connecting belt (404), a rotating disk (405), a convex tooth (406), a fixed cylinder (408) and a return spring (412); the fixed support frame (401) is fixedly arranged on the upper surface of the fixed bottom plate (1); the first rotating wheel (402) is arranged on the outer side wall of the connecting circular shell (302) and is rotatably connected to the connecting circular shell (302); the first rotating wheel (402) is fixedly connected to the rotating shaft (303); the second rotating wheel (403) is rotatably connected to the top end of the fixed support frame (401); the rotating disk (405) is rotatably connected to the top end of the fixed support frame (401); the second rotating wheel (403) and the rotating disk (405) are fixedly connected; and a connecting belt (404) is sleevedly connected between the second rotating wheel (403) and the first rotating wheel (402).

5. The tail gas absorption device in the p-nitroaniline production process according to claim 4, characterized in that: A plurality of protruding teeth (406) are fixedly arranged on the arc-shaped wall of the rotating disk (405), the protruding teeth (406) mesh with the rack (407), a connecting plate (411) is fixedly connected to the bottom end of the rack (407), the fixed cylinder (408) is fixedly arranged on the upper surface of the fixed bottom plate (1), a piston (410) is slidably connected in the inner cavity of the fixed cylinder (408), one end of a connecting rod (409) is fixedly connected to the upper surface of the piston (410), the other end of the connecting rod (409) passes through the upper wall of the inner cavity of the fixed cylinder (408) and extends outside the wall, and the top end of the connecting rod (409) is fixedly connected to the bottom surface of the connecting plate (411).

6. The tail gas absorption device in the production process of p-nitroaniline according to claim 4, characterized in that: One end of a suction tube (414) is fixedly connected to the bottom side of the inner cavity of the fixed cylinder (408); the other end of the suction tube (414) extends into the inner cavity of the absorption bin (2) and is fixedly connected to the absorption bin (2); one end of a discharge tube (413) is fixedly connected to the bottom side of the inner cavity of the fixed cylinder (408); an output check valve is installed on the discharge tube (413); an input check valve is installed on the suction tube (414); one end of a return spring (412) is fixedly connected to the bottom surface of the connecting plate (411); the other end of the return spring (412) is fixedly connected to the upper surface of the fixed bottom plate (1).

7. The tail gas absorption device in the p-nitroaniline production process according to claim 1, characterized in that: The automatic stirring assembly (5) comprises an exhaust gas output tube (501), a fixed bracket (502), a rotating rod (503), a stirring rod (504), a connecting column (505) and a spiral blade (506); the exhaust gas output tube (501) is fixedly arranged on the upper wall of the absorption chamber (2); the exhaust gas output tube (501) is communicated with the inner cavity of the absorption chamber (2); the upper end of the exhaust gas output tube (501) is fixedly connected to a first exhaust gas output pipe (8); the fixed bracket (502) is fixedly arranged in the inner cavity of the absorption bin (2); a rotating rod (503) is rotatably connected to the fixed bracket (502); the bottom end of the rotating rod (503) extends into the hot water in the inner cavity of the absorption bin (2); a stirring rod (504) is fixedly arranged at the bottom end of the rotating rod (503); a connecting column (505) is fixedly connected to the top end of the rotating rod (503); and a spiral blade (506) is fixedly arranged on the arc-shaped wall of the connecting column (505).

8. The tail gas absorption device in the p-nitroaniline production process according to claim 1, characterized in that: The solution replenishing structure (6) comprises a water purification cylinder (601), a storage bin (602), a delivery pump (603), a delivery pipeline (604), a downward pressing piston (605), a guide rod (606), an end plate (607), a tension spring (608), a water purification output pipeline (609) and a liquid level control unit (610). The water purification cylinder (601) is fixedly arranged on the upper surface of the fixed bottom plate (1). The inner cavity of the water purification cylinder (601) is slidably connected to the inner cavity of the water purification cylinder (601). A downward pressing piston (605) is connected, and one end of a guide rod (606) is fixedly connected to the upper surface of the downward pressing piston (605), and the other end of the guide rod (606) passes through the upper wall of the inner cavity of the water purification cylinder (601) and extends outside the wall. The top of the guide rod (606) is fixedly connected to an end plate (607), and the bottom surface of the end plate (607) is fixedly connected to one end of a tension spring (608), and the other end of the tension spring (608) is fixed to the water purification cylinder. The storage bin (602) is fixedly arranged on the upper surface of the fixed bottom plate (1), and a delivery pump (603) is fixedly arranged on the side wall of the storage bin (602). The output end of the delivery pump (603) extends into the inner cavity of the storage bin (602). The output end of the delivery pump (603) is fixedly connected to one end of a delivery pipe (604), and the other end of the delivery pipe (604) extends into the inner cavity of the water purification barrel (601). A one-way valve is arranged on the delivery pipe (604), and purified water is arranged in the inner cavity of the storage bin (602).

9. The tail gas absorption device in the p-nitroaniline production process according to claim 8, characterized in that: The liquid level control unit (610) comprises a cylinder (6101), a valve body (6102), an output end (6103), an input end (6104), a closed core (6105), a guide slider (6106) and a float (6107); the cylinder (6101) is fixedly arranged on the inner cavity side wall of the absorption bin (2); the valve body (6102) is fixedly connected to the upper end of the cylinder (6101); the output end (6103) and the input end (6104) are respectively arranged at two ends of the valve body (6102); the input end (6104) is connected to one end of the clean water output pipe (609); the closed core (6105) is slidably connected to the valve body (6102); the bottom end of the closed core (6105) is fixedly connected to the guide slider (6106); and the float (6107) is fixedly connected to the bottom surface of the guide slider (6106).

10. The tail gas absorption device in the p-nitroaniline production process according to claim 8, characterized in that: A heat exchange pipe (611) is fixedly arranged in the inner cavity of the water purification cylinder (601), one end of the heat exchange pipe (611) is fixedly connected to one end of the first exhaust gas output pipe (8), and the other end of the heat exchange pipe (611) is fixedly connected to the second exhaust gas output pipe (9).

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