Tail gas absorption mechanism of NMP rectification equipment is improved

Abstract

The utility model discloses improve NMP rectification equipment's tail gas absorption mechanism, the utility model relates to rectification tail gas processing technical field. This improve NMP rectification equipment's tail gas absorption mechanism includes support frame, and the upper portion of support frame is provided with processing mechanism, is used for processing tail gas, processing mechanism includes: absorption subassembly, including fixed mounting in the filter tube of support frame inside, the bottom fixed mounting of filter tube has liquid discharge valve, the inside fixed mounting of filter tube has the inner tube, when tail gas enters the inner tube under the pressurization of air pump, will be forced to pass through adsorption filler layer from top to bottom, and tail gas is fully contacted with adsorption filler, and the difficultly soluble component in it is captured by adsorption filler because of intermolecular force or chemical adsorption effect, thereby separates from tail gas, when adsorption filler is saturated, can dismantle the bottom cover of inner tube bottom end, and the angle of support disc is adjusted to take out support disc, and the new adsorption filler is replaced fast, and the sustained absorption capacity to the difficultly soluble component is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of distillation tail gas treatment technology, specifically to improving the tail gas absorption mechanism of NMP distillation equipment. Background Technology

[0002] The tail gas absorption equipment of distillation equipment is a core auxiliary component that ensures the environmental friendliness, safety and economy of the distillation process. Its core function is to efficiently treat the tail gas generated during the distillation process.

[0003] The existing utility model patent with publication number CN215610442U discloses a protective mechanism for an ethylene oxide tail gas absorption tank, including a tank body, an installation mechanism, and a protective mechanism. The installation of the device is relatively simple and easy to operate due to the cooperation between the guardrail frame, fixing sleeve, bolts, nuts, mounting plate, and mounting cylinder. Tightening the bolts causes the nuts to approach the mounting cylinder, generating mutual thrust, which causes the fixing sleeve and bolts to simultaneously press against the guardrail frame for fixation. This method extends the service life of the protective mechanism and enhances the safety of the device. In this utility model, the connecting sleeve, fixing pin, and fixing screw cooperate to connect the ladder and tank body by tightening the fixing screw. Operation is simple. During use, a safety rope is attached, and the movement of the worker causes the slider to slide within the groove, providing secondary protection for the worker's safety and enhancing the safety of the device.

[0004] The aforementioned absorption device can only absorb harmful components in the exhaust gas through the solvent. However, substances with extremely low solubility are produced during the distillation process. This single absorption method cannot effectively remove harmful components from the exhaust gas. Furthermore, when the gas enters the solvent, it rises in the form of bubbles, affecting the effective contact area between the gas and the solvent and thus the gas dissolution efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides an improved tail gas absorption mechanism for NMP distillation equipment, which solves the problems of being unable to limit the volume of gas bubbles generated in the solvent and being unable to absorb poorly soluble components in the tail gas.

[0006] To achieve the above objectives, this utility model provides the following technical solution: The tail gas absorption mechanism of the NMP distillation equipment includes a support frame, and a processing mechanism is disposed above the support frame for processing the tail gas. The processing mechanism includes: An absorption assembly includes a filter tube fixedly installed inside a support frame. A drain valve is fixedly installed at the bottom of the filter tube. An inner tube is fixedly installed inside the filter tube. A flow guide ring is fixedly installed between the filter tube and the inner tube. Fine meshes are fixedly installed on both sides of the flow guide ring. A flow rectifier is fixedly installed at the top of the filter tube. A top cover is movably installed at the top of the inner tube. A support plate is fitted inside the inner tube. A one-way diaphragm is fitted at the bottom of the inner tube. A bottom cover is movably installed at the bottom of the inner tube. The conveying assembly, located on one side of the support frame, is used to convey exhaust gas.

[0007] Preferably, the conveying assembly includes a filter chamber fixedly installed on the front side of the support frame, a filter plate is fitted inside the filter chamber, a sealing ring is fixedly installed at the front end of the filter chamber, a panel is fixedly installed on the front side of the filter chamber, an air pump is fixedly installed at the top of the filter chamber, and a hose is connected to the exhaust port of the air pump.

[0008] Preferably, the bottom of the filter tube is connected to the outside through a drain valve, the top of the filter tube is provided with a ring of circular holes, the upper and lower ends of the filter tube are fixedly connected to the inner tube, the guide ring is spiral, and a tubular structure is provided on one side of the rectifier for discharging the treated exhaust gas.

[0009] Preferably, the inner tube extends through the top of the fairing, and the outer wall of the inner tube is fixedly connected to the fairing. The inner wall of the inner tube is provided with rectangular protrusions distributed in an "X" shape. The outer edge of the support plate is provided with a notch that matches the size of the protrusion structure on the inner wall of the inner tube. The support plate is installed equidistantly inside the inner tube.

[0010] Preferably, the bottom outer side of the inner tube is provided with horizontal tubular structures distributed in a ring, the one-way diaphragm is installed inside each horizontal tubular structure at the bottom of the inner tube, the center of the top cover is provided with a tubular structure, and the top cover and the bottom cover are connected to the inner tube by threaded structures.

[0011] Preferably, the bottom of the filter chamber is provided with a tubular structure for air intake, the filter plates are vertically and equidistantly fitted inside the filter chamber, the panel is connected to the filter chamber by bolts, and the inner side of the panel is made of rubber. The air inlet end of the air pump is connected to the filter chamber, and the air outlet end of the air pump is connected to the tubular structure at the center of the top cover through a hose.

[0012] Beneficial effects This invention provides an improved tail gas absorption mechanism for NMP distillation equipment. Compared with the prior art, it has the following advantages: (1) The tail gas absorption mechanism of this improved NMP distillation equipment limits the volume of bubbles through the combination of a guide ring and a fine mesh. First, a spiral guide ring is fixedly installed in the cavity between the filter tube and the inner tube. When the tail gas enters the solvent through the one-way diaphragm, it will slowly float up along the spiral path under the guidance of the guide ring, avoiding the formation of large bubbles due to the direct and disorderly rise of the tail gas. At the same time, fine meshes are fixed on both sides of the guide ring. As the tail gas bubbles move along the guide ring, they will inevitably come into contact with the fine meshes. The mesh structure of the fine meshes will cut the bubbles, dividing the originally large bubbles into multiple small and uniform bubbles, thereby effectively limiting the bubble volume. This method not only ensures that the movement path of the tail gas in the solvent is controllable, but also directly reduces the bubble volume through physical cutting, greatly increasing the contact area between the tail gas and the solvent and improving the gas dissolution efficiency.

[0013] (2) The tail gas absorption mechanism of the improved NMP distillation equipment achieves the absorption of difficult-to-dissolve components through the cooperation of the inner tube, support plate and adsorption packing. The inner wall of the inner tube features rectangular protrusions arranged in an "X" shape. The outer edge of the support plate has notches matching the size of these protrusions. During installation, the support plate is first aligned with the protrusions through the notches and inserted into the inner tube. Then, the support plate is rotated to offset the notches from the protrusions, thus securing the support plate in place. Multiple support plates are equidistantly distributed within the inner tube cavity, forming a stable support structure. Workers can fill the spaces between the support plates inside the inner tube with targeted adsorption packing. The adsorption packing is evenly distributed and does not move arbitrarily due to the support of the support plates. When exhaust gas enters the inner tube under pressure from the air pump, it is forced through the adsorption packing layer from top to bottom, ensuring full contact between the exhaust gas and the adsorption packing. The poorly soluble components are captured by the adsorption packing due to intermolecular forces or chemisorption, thus separating from the exhaust gas. When the adsorption packing is saturated, the bottom cover of the inner tube can be removed, the angle of the support plate adjusted, and the support plate removed for quick replacement with new adsorption packing, ensuring continuous absorption of poorly soluble components. This approach provides a dedicated treatment pathway for poorly soluble components in exhaust gases, overcoming the shortcomings of traditional single-solvent absorption. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the inner tube installation structure of this utility model; Figure 3 This is a schematic diagram of the flow guide ring structure of this utility model; Figure 4 This is a schematic diagram of the disassembled structure of the support plate of this utility model; Figure 5 This is a schematic diagram of the filter plate installation structure of this utility model; In the diagram: 1. Support frame; 2. Processing mechanism; 21. Absorption assembly; 211. Filter tube; 212. Drain valve; 213. Inner tube; 214. Guide ring; 215. Fine screen; 216. Rectifier shroud; 217. Top cover; 218. Support plate; 219. One-way diaphragm; 2110. Bottom cover; 22. Conveying assembly; 221. Filter chamber; 222. Filter plate; 223. Sealing ring; 224. Panel; 225. Air pump; 226. Hose. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] Please see Figure 1-5 This utility model provides a technical solution: An improved tail gas absorption mechanism for NMP distillation equipment includes a support frame adsorption packing 1, and a treatment mechanism adsorption packing 2 is disposed above the adsorption packing of the support frame adsorption packing 1 for treating the tail gas. The adsorption packing of the treatment mechanism adsorption packing 2 includes: The absorption assembly adsorption packing 21 includes a filter tube adsorption packing 211 fixedly installed inside the adsorption packing 1 of the support frame. A drain valve adsorption packing 212 is fixedly installed at the bottom end of the filter tube adsorption packing 211. An inner tube adsorption packing 213 is fixedly installed inside the filter tube adsorption packing 211. A guide ring adsorption packing 214 is fixedly installed between the filter tube adsorption packing 211 and the inner tube adsorption packing 213. Fine mesh adsorption packing 215 is fixedly installed on both sides of the guide ring adsorption packing 214. A flow rectifier is fixedly installed on the top of the filter tube adsorption packing 211. The inner tube adsorption packing 216 has a top cover movably installed at its top, and a support plate 218 is fitted inside. A one-way diaphragm 219 is fitted at the bottom, and a bottom cover 2110 is movably installed at its bottom. The bottom of the filter tube adsorption packing 211 is connected to the outside via a drain valve. The top of the filter tube adsorption packing 211 has annularly distributed holes. The upper and lower ends of the packing are fixedly connected to the inner tube adsorption packing 213. The guide ring adsorption packing 214 is spiral-shaped. A tubular structure is provided on one side of the rectifier adsorption packing 216 for discharging the treated exhaust gas. The inner tube adsorption packing 213 penetrates the top of the rectifier adsorption packing 216, and the outer wall of the inner tube adsorption packing 213 is fixedly connected to the rectifier adsorption packing 216. The inner wall of the inner tube adsorption packing 213 has rectangular protrusions distributed in an "X" shape. The outer edge of the support plate adsorption packing 218 has... The notch matches the size of the protruding structure on the inner wall of the inner tube adsorption packing 213. The support plate adsorption packing 218 is equidistantly installed inside the inner tube adsorption packing 213. A horizontal tubular structure in a ring is provided on the outer side of the bottom end of the inner tube adsorption packing 213. The unidirectional diaphragm adsorption packing 219 is installed inside each horizontal tubular structure at the bottom of the inner tube adsorption packing 213. A tubular structure is provided in the center of the top cover adsorption packing 217. The top cover adsorption packing 217 and the bottom cover adsorption packing 2110 are connected to the inner tube adsorption packing 213 through a threaded structure.

[0017] Specifically, the support disc adsorption packing 218 consists of a circular structure connected by threads on both the upper and lower sides. A filter screen is located at the center of the support disc adsorption packing 218. The inner and outer circles of the circular structures on both sides of the support disc adsorption packing 218 are connected by a spoke structure, allowing the exhaust gas to pass through the gaps between the spokes and move downwards through the filter screen. The support disc adsorption packing 218 is inserted into the inner tube adsorption packing 213 by engaging with the notch at its outer edge and the protruding structure on the inner wall of the inner tube adsorption packing 213. The angle of the support disc adsorption packing 218 is then adjusted so that the notch at its outer edge... The protruding structure on the inner wall of the inner tube adsorption packing 213 is offset to limit the position of the support plate adsorption packing 218. The support plate adsorption packing 218 supports the adsorption packing, facilitating the filling of the inner tube adsorption packing 213 cavity. The annular tubular structure on the outer bottom of the inner tube adsorption packing 213 connects the cavity of the inner tube adsorption packing 213 with the tubular cavity between the outer side of the inner tube adsorption packing 213 and the filter tube adsorption packing 211. The tubular structure between the outer side of the inner tube adsorption packing 213 and the filter tube adsorption packing 211 allows the top of the filter tube adsorption packing 211 to pass through. The reaction solvent is filled through round holes. A one-way diaphragm adsorption packing 219 within the bottom pipe structure of the inner tube adsorption packing 213 prevents the solvent from entering the inner tube adsorption packing 213 cavity. After passing through three stages of material adsorption from top to bottom, the exhaust gas can enter the cavity between the inner tube adsorption packing 213 and the filter tube adsorption packing 211 through the bottom pipe structure of the inner tube adsorption packing 213. Because the gas density is less than the solvent density, the gas rises after entering the solvent. The spiral guide ring adsorption packing 214 guides the gas through the fine mesh adsorption packing 215. The fine mesh adsorption packing 215, made of plastic, disrupts the bubble structure of the exhaust gas, causing the bubbles to... The exhaust gas is broken down into smaller, finer bubbles to ensure effective contact area between the exhaust gas and the solvent. After rising above the solvent surface, the exhaust gas passes through the circular holes at the top of the filter tube adsorption packing 211 and enters the rectifier adsorption packing 216. It then exits through the tubular structure on the side of the rectifier adsorption packing 216. The drain valve adsorption packing 212 facilitates solvent discharge. The bottom cover adsorption packing 2110 has a sliding cylindrical structure inside, allowing for easy rotation and adjustment of the bottom cylindrical structure during packing replacement. This prevents damage to the drain valve adsorption packing 212.Then, simply rotate the support plate adsorption packing 218 using its spoke structure until the notch of the support plate adsorption packing 218 aligns with the protruding structure on the inner wall of the inner tube adsorption packing 213. This allows the support plate adsorption packing 218 to be removed, facilitating the discharge of the adsorption packing above it from the bottom.

[0018] The conveying component adsorption packing 22 is disposed on one side of the adsorption packing 1 of the support frame and is used to convey exhaust gas. The adsorption packing 22 of the conveying component includes a filter chamber adsorption packing 221 fixedly installed in front of the adsorption packing 1 of the support frame. A filter plate adsorption packing 222 is embedded inside the filter chamber adsorption packing 221. A sealing ring adsorption packing 223 is fixedly installed at the front end of the filter chamber adsorption packing 221. A panel adsorption packing 224 is fixedly installed on the front side of the filter chamber adsorption packing 221. An air pump adsorption packing 225 is fixedly installed at the top end of the filter chamber adsorption packing 221. The exhaust port of the air pump adsorption packing 225 is... The filter chamber adsorption packing 221 has a tubular structure at its bottom for air intake, connected to a flexible hose adsorption packing 226. The filter plate adsorption packing 222 is vertically and equidistantly embedded inside the filter chamber adsorption packing 221. The panel adsorption packing 224 is connected to the filter chamber adsorption packing 221 by bolts, and the inner side of the panel adsorption packing 224 is made of rubber. The air pump adsorption packing 225 has its air intake end connected to the filter chamber adsorption packing 221, and its exhaust end is connected to the tubular structure at the center of the top cover adsorption packing 217 through the flexible hose adsorption packing 226.

[0019] Specifically, before entering the air pump adsorption packing 225, the exhaust gas needs to pass through the filter plate adsorption packing 222 inside the filter chamber adsorption packing 221 under the restriction of the filter chamber adsorption packing 221. This prevents fine particles from entering the air pump adsorption packing 225 and causing internal wear. The air pump adsorption packing 225 can transport the exhaust gas filtered inside the filter chamber adsorption packing 221 through the hose adsorption packing 226 and the top cover adsorption packing 217 to the cavity of the inner tube adsorption packing 213. A certain air pressure is maintained at the top of the inner tube adsorption packing 213 cavity to facilitate the exhaust gas passing through the adsorption packing inside the inner tube adsorption packing 213 cavity.

[0020] Specifically, the unidirectional diaphragm 219 is made of fluororubber, and the multiple diaphragm flaps are arranged in a conical umbrella shape. The unidirectional flow of gas is achieved by opening and closing the diaphragm flaps. The air pump 225 is model FAA6003. At the same time, all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0021] During operation, the exhaust gas to be treated first enters the filter chamber 221 through the tubular structure at the bottom of the filter chamber 221. Under the negative pressure of the air pump 225, the exhaust gas passes vertically through the equidistantly fitted filter plates 222 inside the filter chamber 221. The filter plates 222 filter out fine particles in the exhaust gas, preventing particles from entering the air pump 225 and causing internal wear. The filtered exhaust gas is then drawn into the air pump 225, pressurized by the air pump 225, and discharged from the exhaust port. It is then transported through the hose 226 to the top cover 217 at the top of the inner tube 213, and then discharged from the top... The tubular structure at the center of cover 217 enters the inner tube 213; the exhaust gas moves downward under pressure, passing sequentially through the adsorption packing material supported by support plate 218 inside the inner tube 213, where the poorly soluble components in the exhaust gas are captured by the adsorption packing material; the exhaust gas, having completed adsorption treatment, continues downward, reaching the bottom of the inner tube 213, and then through the horizontally distributed annular tubular structure on the outside of the inner tube 213, it pushes open the one-way diaphragm 219 inside the tubular structure and enters the cavity between filter tube 211 and inner tube 213; at this time, filter tube 211... The reaction solvent has been injected into the cavity between the inner tube 213 and the filter tube 211 through the annular hole at the top. After entering the solvent, the exhaust gas floats upwards due to its lower density. Guided by the spiral guide ring 214, it moves along the guide path. During this process, the exhaust gas bubbles contact the fine mesh 215 on both sides of the guide ring 214, which breaks down large bubbles into smaller ones. After sufficient contact between the exhaust gas and the solvent, the easily soluble components are absorbed by the solvent. Finally, the treated exhaust gas rises above the solvent surface and passes through the top of the filter tube 211. The old solvent enters through the annular hole into the rectifier 216 and then exits through the tubular structure on one side of the rectifier 216. When the solvent needs to be replaced, the old solvent can be discharged by opening the drain valve 212 at the bottom of the filter tube 211. When the adsorption packing needs to be replaced, the bottom cover 2110 at the bottom of the inner tube 213 is removed, and the support plate 218 is rotated to align the outer edge notch with the "X" shaped rectangular protrusion on the inner wall of the inner tube 213. After removing the support plate 218, the old adsorption packing can be discharged from the bottom of the inner tube 213. After replacing the new packing, the reverse steps are followed to reset it.

[0022] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. The tail gas absorption mechanism of NMP rectification equipment is improved, comprising a support frame (1), characterized in that: A processing mechanism (2) is provided above the support frame (1) for processing exhaust gas. The processing mechanism (2) includes: The absorption assembly (21) includes a filter tube (211) fixedly installed inside the support frame (1). A drain valve (212) is fixedly installed at the bottom end of the filter tube (211). An inner tube (213) is fixedly installed inside the filter tube (211). A flow guide ring (214) is fixedly installed between the filter tube (211) and the inner tube (213). Fine mesh (215) is fixedly installed on both sides of the flow guide ring (214). A flow rectifier (216) is fixedly installed at the top of the filter tube (211). A top cover (217) is movably installed at the top of the inner tube (213). A support plate (218) is fitted inside the inner tube (213). A one-way diaphragm (219) is fitted at the bottom of the inner tube (213). A bottom cover (2110) is movably installed at the bottom end of the inner tube (213). The conveying assembly (22) is located on one side of the support frame (1) and is used to convey exhaust gas.

2. The tail gas absorption mechanism for improving NMP distillation equipment according to claim 1, characterized in that: The conveying assembly (22) includes a filter chamber (221) fixedly installed on the front side of the support frame (1). A filter plate (222) is fitted inside the filter chamber (221). A sealing ring (223) is fixedly installed at the front end of the filter chamber (221). A panel (224) is fixedly installed on the front side of the filter chamber (221). An air pump (225) is fixedly installed at the top of the filter chamber (221). A hose (226) is connected to the exhaust port of the air pump (225).

3. The tail gas absorption mechanism for improving NMP distillation equipment according to claim 1, characterized in that: The bottom of the filter tube (211) is connected to the outside through the drain valve (212). The top of the filter tube (211) is provided with a ring of circular holes. The upper and lower ends of the filter tube (211) are fixedly connected to the inner tube (213). The guide ring (214) is spiral. A tubular structure is provided on one side of the rectifier (216) for discharging the treated exhaust gas.

4. The tail gas absorption mechanism for improving NMP distillation equipment according to claim 1, characterized in that: The inner tube (213) penetrates the top of the fairing (216), and the outer wall of the inner tube (213) is fixedly connected to the fairing (216). The inner wall of the inner tube (213) is provided with rectangular protrusions distributed in an "X" shape. The outer edge of the support plate (218) is provided with a notch that matches the size of the protrusion structure on the inner wall of the inner tube (213). The support plate (218) is equidistantly installed inside the inner tube (213).

5. The tail gas absorption mechanism for improving NMP distillation equipment according to claim 1, characterized in that: The bottom outer side of the inner tube (213) is provided with a horizontal tubular structure distributed in a ring. The one-way diaphragm (219) is installed inside each horizontal tubular structure at the bottom of the inner tube (213). The center of the top cover (217) is provided with a tubular structure. The top cover (217) and the bottom cover (2110) are connected to the inner tube (213) through a threaded structure.

6. The tail gas absorption mechanism for improving NMP distillation equipment according to claim 2, characterized in that: The bottom of the filter chamber (221) is provided with a tubular structure for air intake. The filter plate (222) is vertically and equidistantly fitted inside the filter chamber (221). The panel (224) is connected to the filter chamber (221) by bolts, and the inner side of the panel (224) is made of rubber. The air intake end of the air pump (225) is connected to the filter chamber (221), and the exhaust end of the air pump (225) is connected to the tubular structure at the center of the top cover (217) through a hose (226).

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