A waste gas purification device for a carbon fiber precursor manufacturing system

Abstract

The utility model discloses a kind of waste gas purification devices of carbon fiber precursor manufacturing system, including, gas collection unit, for suctioning waste gas generated by carbon fiber precursor manufacturing system;The exhaust pipe of gas collection unit is communicated with circulating spraying unit, the waste liquid outlet of circulating spraying unit is communicated with the liquid inlet of rectifying unit, and the organic solution outlet of rectifying unit is communicated with the organic solution import corresponding to carbon fiber precursor manufacturing system.The beneficial effects brought by the utility model: by the organic waste liquid collected by circulating spraying unit is transported to rectifying unit by pipeline, to make organic waste liquid into reusable organic solution, and organic solution is directly transported back in carbon fiber precursor manufacturing system by pipeline, can reduce the dependence on external supply, to ensure the stable supply of organic solution in production process, improve the stability and continuity of production process.

Description

Technical Field

[0001] This utility model belongs to the field of spinning, specifically, it relates to a waste gas purification device for a carbon fiber precursor manufacturing system. Background Technology

[0002] The main process route for producing carbon fiber precursor in wet spinning is as follows: In the production of carbon fiber precursor by wet spinning, the carbon fiber precursor manufacturing system includes at least a solution preparation unit and a precursor preparation unit. The solution preparation unit is used to prepare the spinning solution, and the precursor preparation unit is used to spray the prepared spinning solution through a spinneret. The spinning solution is coagulated into nascent fibers in a coagulation bath, and then processed into carbon fiber precursor after processes such as washing, oiling, drying, and steam drawing.

[0003] When preparing spinning dope solutions, DMAC (dimethylacetamide), DMSO (dimethyl sulfoxide), or DMF (dimethylformamide) needs to be added. During the processing of the raw fiber preparation unit, some organic matter in the nascent fiber volatilizes upon heating, forming organic waste gas. If directly emitted, this will pollute the air. Existing technologies typically use waste gas treatment equipment such as air scrubbers to recover the organic matter in the waste gas, producing organic waste liquid. However, the organic waste liquid cannot be directly reused and must be sent to companies with waste liquid treatment qualifications for processing. This makes the production of spinning dope solutions dependent on external procurement of organic solutions, which may affect the production process due to factors such as market supply fluctuations and transportation delays, leading to interruptions in the supply of organic solutions or unstable quality during the production process.

[0004] In view of this, this utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art. It provides a method to treat the organic waste liquid collected by the circulating spray unit into a reusable organic solution by transporting it through a pipeline to the distillation unit. The organic solution is then directly transported back to the carbon fiber precursor manufacturing system through a pipeline. This reduces the dependence on external supply and ensures a stable supply of organic solution during the production process, thereby achieving the technical effect of improving the stability and continuity of the production process.

[0006] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is: a waste gas purification device for a carbon fiber precursor manufacturing system, comprising: a gas collection unit for drawing waste gas generated by the carbon fiber precursor manufacturing system; the exhaust pipe of the gas collection unit is connected to a circulating spray unit, the waste liquid outlet of the circulating spray unit is connected to the liquid inlet of the distillation unit, and the organic solution outlet of the distillation unit is connected to the organic solution inlet of the carbon fiber precursor manufacturing system.

[0007] Furthermore, a temporary storage tank is connected in series between the circulating spray unit and the distillation unit, and the volume of the temporary storage tank is greater than the maximum circulating water capacity of the circulating spray unit.

[0008] Furthermore, the temporary storage tank is connected to the inlet of the distillation unit through a liquid supply pipe assembly. The inlet end of the liquid supply pipe assembly extends through the top wall of the temporary storage tank to the bottom of the temporary storage tank, and is spaced a certain distance from the bottom of the temporary storage tank.

[0009] Furthermore, a liquid pumping assembly is connected in series on the liquid supply pipe assembly to pump the liquid in the temporary storage tank. A return pipe is connected downstream of the liquid pumping assembly to the liquid supply pipe assembly, and the outlet end of the return pipe is connected to the temporary storage tank.

[0010] Furthermore, the liquid supply pipe assembly is divided into multiple parallel liquid supply branch pipes and a liquid supply main pipe along the flow direction. The inlet end of each liquid supply branch pipe is connected to the liquid storage tank, and the outlet end of each liquid supply branch pipe is connected to the liquid supply main pipe. Each liquid supply branch pipe is connected in series with a liquid pumping component.

[0011] Furthermore, a buffer unit is connected in series on the main supply pipe, and the volume of the buffer unit is smaller than the volume of the temporary storage tank.

[0012] Furthermore, the circulating spray unit has a cavity inside, and an exhaust port is provided at the top, and a liquid receiving tank with the opening facing upward is provided at the bottom.

[0013] The exhaust pipe is connected to the cavity, which is filled with multiple layers of packing material. Each packing material is located above the exhaust pipe, and a spray assembly is installed above each packing material. The liquid inlet of each spray assembly is connected to the liquid receiving tank.

[0014] Furthermore, the liquid receiving tank is connected to a circulation main pipe, which extends vertically and connects to the liquid inlet of each spray component.

[0015] Furthermore, a circulating water tank is installed on the outside of the circulating spray unit, and the circulating water tank is connected to the liquid receiving tank.

[0016] The circulating water tank is connected to a vertically extending main circulating pipe, and each spray unit is connected to a circulating branch pipe. Each circulating branch pipe passes through the peripheral wall of the circulating spray unit and is connected to the main circulating pipe.

[0017] Furthermore, a steam-water separator is provided between the top of the highest spray assembly and the top of the circulating spray unit. The bottom of the steam-water separator has multiple separation channels that communicate with the top. The outer periphery of the steam-water separator is fitted to the inner wall of the circulating spray unit.

[0018] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: by transporting the organic waste liquid collected by the circulating spray unit to the distillation unit through a pipeline, the organic waste liquid is treated into a reusable organic solution, and the organic solution is directly transported back to the carbon fiber precursor manufacturing system through a pipeline, which can reduce the dependence on external supply, thereby ensuring a stable supply of organic solution in the production process and improving the stability and continuity of the production process.

[0019] Meanwhile, this utility model has a simple structure, significant effects, and is suitable for widespread use.

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0021] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of the carbon fiber precursor manufacturing system according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the circulating spray unit according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the stock solution preparation unit according to an embodiment of the present invention.

[0025] In the diagram: 1. Carbon fiber precursor manufacturing system; 110. Produced solution preparation unit; 111. First filtration device; 112. Organic solution air-cooled tank; 113. First pump; 114. Cooling device; 1141. Air-cooled heat exchanger; 1142. Plate heat exchanger; 1143. Refrigeration device; 115. Second filtration device; 116. Organic solution storage tank; 117. Second pump; 118. Mixing device; 120. Produced fiber preparation unit; 2. Gas collection unit; 210. Gas collection unit. 1. Cover; 220. Exhaust pipe; 3. Circulating spray unit; 310. Packing material; 320. Spray assembly; 330. Circulating main pipe; 331. Circulating branch pipe; 340. Liquid receiving tank; 350. Circulating water tank; 351. Circulating water pump; 360. Gas-liquid separator; 4. Temporary storage tank; 5. Buffer unit; 6. Distillation unit; 7. Organic solution storage unit; 810. Waste liquid pipe; 820. Liquid supply pipe assembly; 821. Liquid supply branch pipe; 822. Liquid extraction assembly; 823. Liquid supply main pipe.

[0026] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] like Figures 1 to 3 As shown in the embodiment of this utility model, a waste gas purification device for a carbon fiber precursor manufacturing system 1 is introduced, including a gas collection unit 2 for drawing waste gas generated by the carbon fiber precursor manufacturing system 1; the exhaust pipe 220 of the gas collection unit 2 is connected to a circulating spray unit 3, the waste liquid outlet of the circulating spray unit 3 is connected to the liquid inlet of the distillation unit 6, and the organic solution outlet of the distillation unit 6 is connected to the organic solution inlet of the carbon fiber precursor manufacturing system 1.

[0031] With the above setup, the organic waste liquid collected by the circulating spray unit 3 is transported to the distillation unit 6 through a pipeline to process the organic waste liquid into a reusable organic solution. The organic solution is then directly transported back to the carbon fiber precursor manufacturing system 1 through a pipeline. This reduces the dependence on external supply, thereby ensuring a stable supply of organic solution during the production process and improving the stability and continuity of the production process.

[0032] It should be noted that the organic waste gas contains DMAC, DMF, or DMSO, and the main solute in the organic waste liquid is DMAC, DMF, or DMSO. The distillation unit 6 purifies the DMAC, DMF, or DMSO in the organic waste liquid through distillation and then transports the basically impurity-free DMAC, DMF, or DMSO organic solution obtained by distillation back to the raw fiber manufacturing system.

[0033] In this embodiment of the invention, the distillation unit 6 consists of multi-effect distillation columns connected in series. The vapor outlets of the other distillation columns (except the last one) are connected to the reboiler inlet of the next-effect distillation column. The vapor outlet of the last distillation column is connected to the organic solution inlet of the carbon fiber precursor manufacturing system 1 via a pipeline. Through the multi-stage distillation process, the purity of the organic solution is further improved, and the temperature at the outlet of each distillation column can be adjusted according to the different boiling points of the main solutes in the treated organic waste liquid. Preferably, the distillation unit 6 adopts a four-effect distillation process, i.e., the distillation unit consists of four distillation columns connected in series.

[0034] In this embodiment of the invention, a temporary storage tank 4 is connected in series between the circulating spray unit 3 and the distillation unit 6, and the volume of the temporary storage tank 4 is greater than the maximum circulating water capacity of the circulating spray unit 3.

[0035] With the above settings, by setting a large-capacity temporary storage tank 4, the temporary storage tank 4 can simultaneously store the organic waste liquid discharged multiple times by the circulating spray unit 3, so as to achieve a homogenization effect on the organic waste liquid, so that the organic waste liquid output from the temporary storage tank 4 has no concentration fluctuation or a small fluctuation, and the concentration of the organic solution produced by the distillation unit 6 is more stable, ensuring the stable operation of the carbon fiber precursor manufacturing system 1.

[0036] In this embodiment of the present invention, the waste liquid outlet of the circulating spray unit 3 is connected to the waste liquid inlet of the temporary storage tank 4, and the waste liquid inlet is located at the top of the top wall or the top of the peripheral wall of the temporary storage tank 4; so that the waste liquid flows from top to bottom into the temporary storage tank 4, preventing the waste liquid from flowing back into the circulating spray unit 3 of the temporary storage tank 4.

[0037] In this embodiment of the present invention, the temporary storage tank 4 is connected to the inlet of the distillation unit 6 through a liquid supply pipe assembly 820. The inlet end of the liquid supply pipe assembly 820 extends through the top wall of the temporary storage tank 4 to the bottom of the temporary storage tank 4, and is spaced a certain distance from the bottom of the temporary storage tank 4. Since the organic waste liquid may contain a variety of solid impurities, they sink or float in the temporary storage tank 4 due to the influence of gravity and buoyancy. By having the liquid supply pipe assembly 820 draw organic waste liquid a certain distance from the bottom of the temporary storage tank 4, the liquid supply pipe assembly 820 can draw relatively pure organic waste liquid, avoid solid impurities from clogging the pipeline of the distillation unit 6, and reduce the cleaning frequency of the distillation unit 6.

[0038] In this embodiment of the present invention, the circulating spray unit 3 is connected to the top wall of the temporary storage tank 4 through the waste liquid pipe 810. The waste liquid pipe 810 and the liquid supply pipe group 820 are respectively connected to the opposite sides of the temporary storage tank 4. This allows the organic waste liquid to enter from one side of the temporary storage tank 4, flow to the opposite side, and then leave the temporary storage tank 4, thereby improving the overall fluidity of the organic waste liquid in the temporary storage tank 4 and avoiding dead zones in the temporary storage tank 4.

[0039] In an embodiment of this utility model, the top wall of the temporary storage tank 4 is provided with at least one communication port, and a sealing flange is provided on the communication port. The liquid supply pipe assembly 820 extends into the temporary storage tank 4 through the communication port, and the sealing flange is sealed on the peripheral wall of the liquid supply pipe assembly 820.

[0040] In this embodiment of the present invention, a liquid pumping assembly 822 is connected in series on the liquid supply pipe assembly 820 for pumping liquid from the temporary storage tank 4. A return pipe is connected downstream of the liquid pumping assembly 822 to the liquid supply pipe assembly 820, and the outlet end of the return pipe is connected to the temporary storage tank 4. Preferably, the liquid pumping assembly 822 is a centrifugal pump or a self-priming pump. When the liquid pumping assembly 822 delivers organic waste liquid to the distillation unit 6, a portion of the organic waste liquid is returned to the temporary storage tank 4 through the return pipe, ensuring that the flow rate of organic waste liquid flowing into the distillation unit 6 remains uniform and constant. The returned organic waste liquid can agitate the organic waste liquid in the temporary storage tank 4, maintaining a certain fluidity and improving the uniformity of the organic waste liquid in the temporary storage tank 4.

[0041] In this embodiment of the invention, the reflux pipe is connected to the top wall of the temporary storage tank 4.

[0042] In this embodiment of the present invention, the connection point between the return pipe and the temporary storage tank 4 is located between the connection point between the wastewater pipe and the temporary storage tank 4 and the connection point between the liquid supply pipe group 820 and the temporary storage tank 4.

[0043] In this embodiment of the invention, the reflux pipe is positioned close to the position where the temporary storage tank 4 is connected to the wastewater pipe.

[0044] In this embodiment of the present invention, the liquid supply pipe assembly 820 is divided into multiple parallel liquid supply branch pipes 821 and a liquid supply main pipe 823 along the flow direction. The liquid inlet end of each liquid supply branch pipe 821 is connected to the liquid storage tank, and the liquid outlet end of each liquid supply branch pipe 821 is connected to the liquid supply main pipe 823. Each liquid supply branch pipe 821 is connected in series with a liquid extraction component 822. By controlling the start and stop of the liquid extraction components 822 on the multiple liquid supply branch pipes 821, the total flow rate of organic waste liquid in the liquid supply pipe assembly 820 can be regulated. At the same time, when the liquid extraction component 822 in use fails, other liquid supply components can be turned on to ensure that the liquid supply pipe assembly 820 stably supplies liquid to the distillation unit 6.

[0045] In this embodiment of the present invention, a buffer unit 5 is connected in series on the main liquid supply pipe 823. The volume of the buffer unit 5 is smaller than the volume of the temporary storage tank 4. By setting the buffer unit 5, the organic waste liquid in the main liquid supply pipe 823 is buffered and stabilized, ensuring that the water pressure of the organic waste liquid flowing out of the buffer unit 5 remains stable.

[0046] In the embodiments of this utility model, the buffer unit 5 includes multiple buffer tanks connected in parallel; the buffer unit 5 has a spare buffer tank, and when the buffer tank in use is blocked, other buffer tanks can be switched to ensure the stable operation of the exhaust gas purification device; and when the amount of organic waste liquid to be treated is large, the organic waste liquid can be diverted to each buffer tank to ensure that the buffer unit 5 can effectively stabilize the pressure of the organic waste liquid.

[0047] In this embodiment of the present invention, the temporary storage tank 4 is connected to a replenishment pipe, and the inlet end of the replenishment pipe is connected to an organic solution storage unit 7, which stores the corresponding pure solution; preferably, a metering pump, a plunger pump, or a centrifugal pump is connected in series on the replenishment pipe.

[0048] Through the above setup, the organic solution storage unit 7 replenishes the temporary storage tank 4 with the pure organic solution purchased externally, so that the concentration of each organic substance in the temporary storage tank 4 is maintained within a stable range, thus ensuring the stable operation of the distillation unit 6. In addition, since the pure organic solution purchased externally may be contaminated with impurities during production and transportation, by connecting the organic solution storage unit 7 to the temporary storage tank 4, the pure organic solution is mixed with the organic waste liquid, and then processed by the distillation unit 6 before entering the carbon fiber precursor manufacturing system 1. This purifies the pure organic solution, ensuring that the concentration of the organic solution entering the carbon fiber precursor manufacturing system 1 remains uniform, and also preventing impurities in the pure organic solution purchased externally from affecting the stable operation of the carbon fiber precursor manufacturing system 1.

[0049] In this embodiment of the present invention, the organic solution storage unit 7 is a storage tank with a cavity, used to store a pure solution of organic substances with the same main solute as the organic waste liquid; the organic solution storage unit 7 can transfer the solution in the corresponding storage tank into the temporary storage tank 4 as needed.

[0050] In this embodiment of the present invention, the replenishment pipe is connected to the top of one side of the temporary storage tank 4; preferably, the connection between the replenishment pipe and the temporary storage tank 4 is located near the connection between the waste liquid pipe 810 and the temporary storage tank 4, so that the organic waste liquid and the pure organic solution are mixed and flow towards the inlet end of the supply pipe assembly 820.

[0051] In this embodiment of the present invention, a concentration monitoring device is installed in the temporary storage tank 4. The concentration monitoring unit is used to monitor the concentration of the main solute in the organic waste liquid. When the concentration of the main solute in the organic waste liquid in the temporary storage tank 4 is lower than the preset concentration value, the metering pump, plunger pump or centrifugal pump connected in series on the corresponding replenishment pipe is started to transport the pure organic solution stored in the organic solution storage unit 7 to the temporary storage tank 4.

[0052] In this embodiment of the invention, the top of the circulating spray unit 3 is positioned higher than the top wall of the temporary storage tank 4, so that the organic waste liquid can flow into the temporary storage tank 4 by gravity through the circulating spray unit 3.

[0053] In this embodiment of the present invention, the circulating spray unit 3 is set on the ground; the ground is provided with a downwardly recessed receiving groove, and the temporary storage tank 4 is correspondingly set in the receiving groove; preferably, the top of the temporary storage tank 4 is lower than the top of the receiving groove, or is set flush with the top of the receiving groove.

[0054] In an embodiment of this utility model, the carbon fiber precursor manufacturing system 1 includes a raw material preparation unit 110 and a precursor preparation unit 120. The spinning raw material produced by the raw material preparation unit 110 is processed into carbon fiber precursor by the precursor preparation unit 120. The gas collection unit 2 is installed in the precursor preparation unit 120 to extract the waste gas generated by the precursor preparation unit 120. The organic solution outlet of the distillation unit 6 is connected to the organic solution inlet of the raw material preparation unit 110 through a pipeline.

[0055] In an embodiment of this utility model, the liquid storage device group includes an organic solution air-cooled tank 112, and a cooling device 114 is provided downstream of the organic solution storage tank 112 for cooling the flowing organic solution; an organic solution storage tank 116 is provided downstream of the cooling device 114; so that the organic solution entering the stock solution preparation unit 110 is first buffered and temporarily stored, and after being cooled to a lower temperature by the cooling device 114, it is then stored in the organic solution storage tank 116 for later use.

[0056] In this embodiment of the present invention, the organic solution storage tank 116 is also connected to a filling pipe. The inlet end of the filling pipe is detachably connected to the storage tank of the barrel or tanker containing the corresponding organic solution. A transfer pump is connected in series on the filling pipe. The transfer pump is used to pump the organic solution in the barrel or tank to the organic solution storage tank 116. When the amount of organic solution in the organic solution storage tank 116 is insufficient, the organic solution purchased from outside can be added to the organic solution storage tank 116 through the filling pipe to ensure the stable operation of the carbon fiber precursor manufacturing system 1.

[0057] In this embodiment of the present invention, an organic solution storage tank 116 is provided with a concentration monitoring device for monitoring the concentration of the organic solution in the organic solution storage tank 116. When the concentration is low, the transfer pump is controlled to pump the organic solution in the bucket or tank into the organic solution storage tank 116. When the concentration value monitored by the concentration monitoring device in the organic solution storage tank 116 is greater than or equal to a preset concentration threshold, the transfer pump is turned off.

[0058] In an embodiment of this utility model, the liquid storage device group includes a first filtration device 111, which is located upstream of the organic solution air-cooled tank 112 to filter the flowing organic solution and prevent impurities in the organic solution from entering the organic solution air-cooled tank 112.

[0059] In this embodiment of the invention, a first pump 113 is connected in series between the outlet of the organic solution air-cooled tank 112 and the cooling device 114; the operation of the first pump 113 provides power to the organic solution, allowing the organic solution to flow smoothly to the cooling device.

[0060] In the embodiments of this utility model, the cooling device 114 includes an air-cooled heat exchange device 1141, a plate heat exchange device 1142 and a refrigeration device 1143 connected in series. The organic solvent is gradually cooled down through multi-stage cooling, thereby improving the cooling effect on the organic solution.

[0061] In an embodiment of this utility model, the air-cooled heat exchange device 1141 includes a motor and an impeller connected to the motor for transmission, as well as a first heat exchange tube for the flow of organic solvent. The motor drives the impeller to rotate, which drives room temperature air to flow into the first heat exchange tube to cool the hotter organic solvent in the first heat exchange tube. Preferably, the first heat exchange tube is provided with multiple fins to improve the heat exchange efficiency.

[0062] In the embodiments of this utility model, the plate heat exchange device 1142 is composed of multiple corrugated metal plates stacked together. A refrigerant channel for refrigerant to pass through and a second heat exchange channel for organic matter to pass through are formed on both sides of the metal plates respectively. The low-temperature refrigerant in the refrigerant channel efficiently cools the organic matter in the second heat exchange channel.

[0063] In this embodiment of the invention, the refrigeration device 1143 includes: a compressor, which draws in low-temperature, low-pressure refrigerant gas and compresses it into high-temperature, high-pressure gas to provide power for the refrigeration cycle; a condenser, which, through a heat release process, changes the refrigerant from a gaseous state to a liquid state, preparing for the refrigerant to evaporate and absorb heat in the evaporator; an expansion valve, which, through a throttling and pressure-reducing process, enables the refrigerant to evaporate in the evaporator at a lower pressure and temperature, thereby absorbing more heat; and an evaporator, which, through the heat absorption process of refrigerant evaporation, cools the organic solvent.

[0064] In this embodiment of the invention, a second filter device is connected in series between the plate heat exchanger 1142 and the refrigeration device 1143 to filter the flowing organic solvent and further reduce impurities in the organic solvent.

[0065] In an embodiment of this utility model, the carbon fiber precursor manufacturing system 1 includes a mixing device 118. The outlet of the organic solution storage tank 116 is connected to the inlet of the mixing device 118 through a liquid delivery pipe. Specifically, the mixing device 118 also has a solid inlet. Solid polymer is added to the solid mixing device 118 through the solid inlet by manual pouring or conveying device such as a belt, so as to mix the solid polymer with the organic solution to prepare spinning solution.

[0066] In an embodiment of this utility model, a second pump 117 is connected in series on the infusion pipeline. The second pump 117 provides power to transport the organic solutions in each organic solution storage tank 116 to the mixing device 118. Preferably, the second pump 117 is a metering pump to accurately control the amount of liquid used in the infusion pipeline.

[0067] In an embodiment of this utility model, the gas collection unit 2 includes a plurality of gas collection hoods 210, and the gas outlet of each gas collection hood 210 is connected to an exhaust pipe 220; a fan is connected in series on the exhaust pipe 220 so that the fan drives each gas collection hood 210 to draw in waste gas.

[0068] In the embodiments of this utility model, each gas collecting hood 210 is a hood whose cross-section gradually decreases from the air inlet end to the air outlet end.

[0069] In this embodiment of the present invention, the air inlet port of each gas collection hood 210 is covered with a safety filter screen, and the safety filter screen has filter holes distributed on it; the safety filter screen filters the fibers floating in the air generated by the carbon fiber filament manufacturing system 1, preventing the fibers from entering the circulating spray unit 3 through the exhaust pipe 220, which would result in a large amount of fibers remaining in the organic waste liquid of the circulating spray unit 3, causing blockage of the downstream pipe.

[0070] In this embodiment of the invention, the circulating spray unit 3 has a cavity inside, with an exhaust port at the top and an upward-facing liquid receiving tank 340 at the bottom. The exhaust pipe 220 is connected to the cavity, and multiple layers of packing material 310 are arranged inside the cavity. Each packing material 310 is located above the exhaust pipe 220, and a spray assembly 320 is arranged above each packing material 310. The liquid inlet end of each spray assembly 320 is connected to the liquid receiving tank 340. By setting multiple layers of packing material 310 and correspondingly setting the same number of spray assemblies 320, the contact area and time between the circulating liquid and the exhaust gas are increased, thereby improving the purification effect on the exhaust gas.

[0071] In the embodiments of this utility model, the outer peripheral wall of each packing 310 is in contact with the peripheral side wall of the circulating spray unit 3, so that the exhaust gas can only flow from bottom to top through the gaps on each layer of packing 310.

[0072] In the embodiments of this utility model, each spray assembly 320 includes multiple spray heads located on the same plane, and each spray head sprays circulating liquid onto the corresponding packing 310 to ensure that the pores of each layer of packing 310 can be wetted by the circulating liquid.

[0073] In the embodiments of this utility model, the circulating liquid is water, and it becomes organic wastewater as the content of dissolved organic matter increases.

[0074] In the embodiments of this utility model, the exhaust pipe 220 extends through the outer peripheral wall of the circulating spray unit 3 into the cavity; preferably, the exhaust pipe 220 extends horizontally.

[0075] In this embodiment of the invention, the exhaust pipe 220 is bent downwards at the outlet end to allow the exhaust gas to be blown downwards from the exhaust pipe 220 and then flow upwards, thereby reducing the speed of the exhaust gas when passing through the packing 310, increasing the contact time between the exhaust gas and the circulating liquid, and improving the solution effect of the circulating water on the organic matter in the exhaust gas.

[0076] In this embodiment of the present invention, the liquid receiving tank 340 is connected to a circulation main pipe 330, which extends vertically and is connected to the liquid inlet of each spray assembly 320; so as to supply circulating liquid to each spray assembly 320 through a pipeline, ensuring that the organic matter content of the circulating liquid sprayed by each spray assembly 320 is the same.

[0077] In this embodiment of the present invention, a circulating water tank 350 is provided on the outside of the circulating spray unit 3, and the circulating water tank 350 is connected to the liquid receiving tank 340; the circulating water tank 350 is connected to a vertically extending circulating main pipe 330, and each spray component 320 is connected to a circulating branch pipe 331, each circulating branch pipe 331 passing through the peripheral wall of the circulating spray unit 3 and connected to the circulating main pipe 330.

[0078] With the above arrangement, the circulating liquid flows from the receiving tank 340 to the circulating water tank 350 outside the circulating spray unit 3, and then flows to the corresponding spray assembly 320 through the external circulating main pipe 330. This prevents the outer surface of the circulating main pipe 330 and the circulating water pump 351 that draws the circulating liquid from the circulating water tank 350 from contacting the circulating liquid sprayed by the spray assembly 320, which would cause the circulating main pipe 330 and the circulating water pump 351 to oxidize more quickly.

[0079] In the embodiments of this utility model, each circulation branch pipe 331 is provided with a control valve, and the flow rate of each circulation branch pipe 331 is controlled by the opening degree of the control valve; the larger the opening degree of the control valve, the larger the flow rate of the corresponding circulation branch pipe 331; preferably, the opening degree of each control valve decreases gradually in the vertical direction; since the concentration of organic matter gradually decreases as the exhaust gas flows upward, by controlling the opening degree of the control valve, the water output of the lower spray assembly 320 is increased, so as to specifically treat the exhaust gas that has just entered the circulation spray unit 3, thereby improving the purification effect of the exhaust gas.

[0080] In an embodiment of this utility model, a waste liquid outlet is provided at the bottom or the lower half of the sidewall of the circulating water tank 350.

[0081] In this embodiment of the present invention, a circulating water pump 351 is provided on the top of the circulating water tank 350, and the outlet end of the circulating water pump 351 is connected to the circulating main pipe 330.

[0082] In an embodiment of this utility model, a plurality of parallel circulating water pumps 351 are provided on the top of the circulating water tank 350, and the outlet end of each circulating water pump 351 is connected to the circulating main pipe 330.

[0083] In this embodiment of the present invention, the liquid receiving tank 340 and the circulating water tank 350 are respectively located on the inner and outer sides of the peripheral wall of the circulating spray unit 3, and a communication port is provided on the peripheral wall so that the liquid receiving tank 340 can be connected to the circulating water tank 350 through the communication port. Preferably, the communication port is covered with a filter plate with filter holes distributed on the filter plate so that the circulating liquid in the liquid receiving tank 340 passes through the filter plate, preventing the lint in the exhaust gas from entering the liquid receiving tank 340 with the circulating liquid and then entering the circulating main pipe 330 through the circulating water tank 350, which would cause the circulating main pipe 330 and the spray assembly 320 to be blocked.

[0084] In this embodiment of the present invention, a concentration monitoring device is provided in the receiving tank 340 to monitor the concentration of organic solute in the circulating liquid in the receiving tank 340. During the operation of the circulating spray unit 3, the concentration of organic solute in the circulating liquid gradually increases, causing the circulating liquid to become organic waste liquid. The concentration monitoring device monitors the actual concentration of organic solute in the circulating liquid in real time. When the actual concentration reaches the preset concentration, the waste liquid pipe 810 is opened to transport the organic waste liquid in the receiving tank 340 and the circulating water tank 350 to the temporary storage tank 4.

[0085] In this embodiment of the present invention, a vapor-water separator 360 is provided between the top of the highest spray assembly 320 and the top of the circulating spray unit 3. The bottom of the vapor-water separator 360 has multiple separation channels communicating with the top. The outer periphery of the vapor-water separator 360 is fitted to the inner wall of the circulating spray unit 3. The vapor-water separator 360 dehydrates the gas passing through it, reducing the humidity of the gas and preventing water containing organic matter from being discharged through the exhaust port of the circulating spray unit 3 with the gas, thereby further improving the purification effect of the circulating spray unit 3 on the exhaust gas.

[0086] In this embodiment of the present invention, a maintenance port is provided on the peripheral wall of the circulating spray unit 3 between the lowest packing layer 310 and the exhaust pipe 220 to facilitate the inspection and maintenance of the seasoning layer and the exhaust pipe 220 by the staff; a maintenance port is provided on the peripheral wall of the circulating spray unit 3 between the spray assembly 320 and the corresponding packing 310; a maintenance port is provided on the peripheral wall of the circulating spray unit 3 near the steam-water separator 360.

[0087] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. The implementation schemes in the above embodiments can be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A waste gas purification device for a carbon fiber precursor manufacturing system, comprising, The gas collection unit (2) is used to draw out the waste gas generated by the carbon fiber precursor manufacturing system (1); Its features are, The exhaust pipe (220) of the gas collection unit (2) is connected to the circulating spray unit (3), the waste liquid outlet of the circulating spray unit (3) is connected to the liquid inlet of the distillation unit (6), and the organic solution outlet of the distillation unit (6) is connected to the corresponding organic solution inlet of the carbon fiber precursor manufacturing system (1).

2. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 1, characterized in that, A temporary storage tank (4) is connected in series between the circulating spray unit (3) and the distillation unit (6). The volume of the temporary storage tank (4) is greater than the maximum circulating water capacity of the circulating spray unit (3).

3. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 2, characterized in that, The temporary storage tank (4) is connected to the inlet of the distillation unit (6) through the liquid supply pipe assembly (820). The liquid supply pipe assembly (820) extends through the top wall of the temporary storage tank (4) to the bottom of the temporary storage tank (4) and is spaced a certain distance from the bottom of the temporary storage tank (4).

4. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 3, characterized in that, A liquid pumping assembly (822) is connected in series on the liquid supply pipe assembly (820) for pumping liquid from the temporary storage tank (4). A return pipe is connected downstream of the liquid pumping assembly (822) in the liquid supply pipe assembly (820), and the outlet end of the return pipe is connected to the temporary storage tank (4).

5. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 3, characterized in that, The liquid supply pipe assembly (820) is divided into multiple parallel liquid supply branch pipes (821) and a liquid supply main pipe (823) along the flow direction. The inlet end of each liquid supply branch pipe (821) is connected to the liquid storage tank, and the outlet end of each liquid supply branch pipe (821) is connected to the liquid supply main pipe (823). Each liquid supply branch pipe (821) is connected in series with a liquid pumping assembly (822).

6. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 5, characterized in that, A buffer unit (5) is connected in series on the main liquid supply pipe (823). The volume of the buffer unit (5) is smaller than the volume of the temporary storage tank (4).

7. A waste gas purification device for a carbon fiber precursor manufacturing system according to any one of claims 1-6, characterized in that, The circulating spray unit (3) has a cavity inside, and an exhaust port is provided at the top and a liquid receiving tank (340) with the opening facing upward at the bottom. The exhaust pipe (220) is connected to the cavity. The cavity is filled with multiple layers of packing (310). Each packing (310) is located above the exhaust pipe (220). Each packing (310) is equipped with a spray assembly (320) above it. The liquid inlet of each spray assembly (320) is connected to the liquid receiving tank (340).

8. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 7, characterized in that, The liquid receiving tank (340) is connected to a circulation main pipe (330), which extends vertically and is connected to the liquid inlet of each spray assembly (320).

9. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 7, characterized in that, A circulating water tank (350) is provided on the outside of the circulating spray unit (3), and the circulating water tank (350) is connected to the liquid receiving tank (340); The circulating water tank (350) is connected to a vertically extending circulating main pipe (330), and each spray assembly (320) is connected to a circulating branch pipe (331). Each circulating branch pipe (331) passes through the peripheral wall of the circulating spray unit (3) and is connected to the circulating main pipe (330).

10. The waste gas purification device for a carbon fiber precursor manufacturing system according to claim 7, characterized in that, A steam-water separator (360) is provided between the top of the highest spray assembly (320) and the top of the circulating spray unit (3). The bottom of the steam-water separator (360) has multiple separation channels that communicate with the top. The outer periphery of the steam-water separator (360) is fitted to the inner wall of the circulating spray unit (3).

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