Acetylene gas recovery system
By using a baffle assembly design with a flow guide shroud and flow guide plate in the flash tank, the problem of low efficiency in existing flash tanks is solved, achieving efficient recovery of acetylene gas and safe production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG ZHONGTAI CHEM FUKANG ENERGY CO LTD
- Filing Date
- 2025-04-18
- Publication Date
- 2026-05-15
AI Technical Summary
Existing flash tanks are inefficient, resulting in low acetylene recovery rates and posing safety hazards.
The design employs baffle components and flow guiding structures, including flow guide shrouds and flow guide plates, to increase the specific surface area of the liquid and improve gas-liquid contact efficiency through flow patterns from the center to the outer periphery and from the outer periphery to the center.
This improved the acetylene recovery rate, reduced production costs, minimized safety hazards, and ensured production stability and safety.
Smart Images
Figure CN224243004U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of acetylene gas purification technology and is an acetylene gas recovery system. Background Technology
[0002] In acetylene refining processes, sodium hypochlorite purification is a mainstream method widely used for acetylene purification. This method utilizes the oxidizing properties of sodium hypochlorite solution to effectively remove impurities such as phosphine and hydrogen sulfide from acetylene, thereby obtaining pure acetylene. However, during the purification process, the sodium hypochlorite solution gradually loses its oxidizing ability. When the effective chlorine content drops to a certain level, the solution becomes waste sodium hypochlorite solution.
[0003] Waste sodium hypochlorite solution contains a large amount of dissolved acetylene gas, with its effective chlorine content and impurity content exceeding emission standards, thus requiring effective treatment and recovery. Currently, the industry commonly uses a negative pressure flash evaporation process to recover acetylene gas from waste sodium hypochlorite solution. This process typically involves feeding the waste sodium hypochlorite solution into a flash tank, where it undergoes flash evaporation under negative pressure, allowing the dissolved acetylene gas to escape. However, traditional flash tank designs often suffer from low flash evaporation efficiency, resulting in some acetylene gas remaining dissolved in the sodium hypochlorite solution and flowing into subsequent aeration equipment. This not only wastes acetylene gas and causes economic losses but also increases the risk of violent reactions or even explosions during the reconstitution of sodium hypochlorite solution.
[0004] Traditional flash tank designs typically employ simple spraying methods or plate tower structures to increase the liquid's specific surface area and utilize a negative pressure pump to provide the necessary negative pressure environment for flash evaporation. However, this design often fails to achieve efficient flash evaporation, resulting in low acetylene recovery rates, complex equipment structures, and high operating and maintenance costs.
[0005] With the urgent need for enterprises to reduce costs and increase efficiency in production, developing a high-efficiency and simple-structure flash tank is of significant practical importance. A high-efficiency flash tank can improve the recovery rate of acetylene gas, reduce resource waste, lower production costs, and simultaneously reduce the safety hazards associated with the compounding of sodium hypochlorite solution, ensuring production safety. Summary of the Invention
[0006] This invention provides an acetylene gas recovery system that overcomes the shortcomings of the prior art and effectively solves the problem of low efficiency in recovering acetylene gas from waste sodium hypochlorite solution using existing flash tanks.
[0007] The technical solution of this utility model is achieved through the following measures: An acetylene gas recovery system includes a flash tank, a baffle assembly, a liquid inlet pipe, a gas phase outlet pipe, and a liquid phase outlet pipe. The flash tank is provided with a gas phase outlet pipe at the top and a liquid phase outlet pipe at the bottom. The upper outer side of the flash tank is provided with a liquid inlet pipe whose inner end is located inside the flash tank. At least one set of baffle assemblies is provided vertically at intervals in the flash tank corresponding to the position below the liquid inlet pipe. Each baffle assembly includes an upper liquid distributor and a lower liquid distributor. The upper liquid distributor can guide the liquid from the center to the outer periphery, and the lower liquid distributor can guide the liquid from the outer periphery to the center.
[0008] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:
[0009] The aforementioned upper liquid distributor can be a flow guide shroud, which is conical in shape with a smaller upper part and a larger lower part. The outer side of the flow guide shroud is provided with several first flow holes that are connected inside and outside. A liquid passage gap is provided between the outer side of the lower end of the flow guide shroud and the inner side of the flash tank. The lower liquid distributor is a flow guide plate, which is circular in shape. The upper side of the flow guide plate is provided with several second flow holes that are connected inside and outside.
[0010] The aforementioned inlet pipe may include a straight inlet pipe and an inlet bend pipe. The upper outer side of the flash tank is provided with an inlet straight pipe with an inlet bend pipe fixedly installed at its inner end. The outlet end of the inlet bend pipe is located on the lower side and above the top of the flow guide shroud.
[0011] The aforementioned baffle assembly may further include an upper fixing block, an upper fixing ear, a lower fixing ring, and a lower fixing ear. At least two upper fixing blocks are provided circumferentially at intervals on the inner side of the flash tank corresponding to each flow guide shroud position. An installation groove is provided on the inner side of the middle portion of the upper fixing block. A first notch that can communicate with the installation groove is provided on the upper side of the upper fixing block. A second notch that can communicate with the installation groove is provided on the lower side of the upper fixing block. An upper fixing ear located in the installation groove is fixedly installed on the outer side of the lower end of the flow guide shroud. A lower fixing ring is fixedly installed on the inner side of the flash tank corresponding to each flow guide plate position. An installation ring groove is provided on the inner side of the middle portion of the lower fixing ring. At least two lower fixing ears located in the installation ring groove are provided circumferentially at intervals on the outer side of the flow guide plate. A third notch that can communicate with the installation ring groove is provided on the upper side of the lower fixing ring corresponding to each lower fixing ear position. A fourth notch that can communicate with the installation ring groove is provided on the lower side of the lower fixing ring corresponding to each lower fixing ear position.
[0012] The above may also include a mist eliminator, which is fixedly installed on the inner side of the upper part of the flash tank above the liquid inlet pipe.
[0013] The above may also include a manhole, which is provided on the top of the flash tank.
[0014] The above may also include a buffer tank, a preheater, a cooler, a vacuum pump, a flow meter, a flow regulating valve, a thermometer, a temperature regulator, a level gauge, and a level control valve. The buffer tank inlet is equipped with a liquid inlet pipeline, and the buffer tank outlet is fixedly connected to the preheater medium inlet with a liquid outlet pipeline. The preheater medium outlet is fixedly connected to the inlet of the liquid inlet pipe. The preheater heat exchange medium inlet is fixedly connected to a steam inlet pipeline, and the preheater heat exchange medium outlet is fixedly connected to a steam outlet pipeline. The outlet of the vapor phase outlet pipe is fixedly connected to the cooler medium inlet, and the cooler medium outlet is fixedly connected to the vacuum pump inlet with a vacuum pipeline. A flow meter and a flow regulating valve are installed on the liquid inlet pipeline, a level gauge is installed on the flash tank, a level control valve is installed on the liquid phase outlet pipe, a temperature regulator is installed on the steam inlet pipeline, and a thermometer is installed on the liquid inlet pipe.
[0015] This utility model has a reasonable and compact structure and is easy to use. By setting a flow guide hood, the waste sodium hypochlorite solution is guided from the center to the outer periphery, and the waste sodium hypochlorite solution flows downward through the first flow hole and the liquid gap. By setting a flow guide plate, the waste sodium hypochlorite solution is guided from the outer periphery to the center, and the waste sodium hypochlorite solution flows downward through the second flow hole and the central through hole of the annular flow guide plate. By setting multiple layers of flow guide hoods and flow guide plates with alternating vertical distribution, the waste sodium hypochlorite solution continuously flows from the center to the outer periphery, from the outer periphery to the center, from the center to the outer periphery, and from the outer periphery to the center after entering the flash tank, thereby increasing the specific surface area. By setting a flow guide hood and flow guide plates, the waste sodium hypochlorite solution is evenly distributed, increasing the contact area between the waste sodium hypochlorite solution and the gas phase, improving the flash evaporation efficiency, and removing acetylene gas more quickly. It has the characteristics of stability, high efficiency and good separation effect. Attached Figure Description
[0016] Appendix Figure 1 These are schematic diagrams of the main cross-sectional structure of embodiments 1 to 5 of this utility model.
[0017] Appendix Figure 2 For the appendix Figure 1 A top-down magnified structural diagram of the upper liquid distributor.
[0018] Appendix Figure 3 For the appendix Figure 1 A top-down enlarged structural diagram of the lower liquid distributor.
[0019] Appendix Figure 4 This is a process flow diagram of Embodiment 6 of this utility model.
[0020] The codes in the attached diagram are as follows: 1 is flash tank, 2 is liquid inlet pipe, 3 is gas phase outlet pipe, 4 is liquid phase outlet pipe, 5 is flow guide shroud, 6 is flow guide plate, 7 is first flow passage hole, 8 is second flow passage hole, 9 is liquid passage gap, 10 is upper fixing block, 11 is upper fixing lug, 12 is lower fixing ring, 13 is first notch, 14 is mounting groove, 15 is third notch, 16 is mounting ring groove, 17 is demister, 18 is manhole, 19 is buffer tank, 20 is preheater, 21 is cooler, 22 is vacuum pump, 23 is flow meter, 24 is flow regulating valve, 25 is thermometer, 26 is temperature regulator, 27 is liquid level gauge, 28 is liquid level control valve, 29 is liquid outlet line, 30 is steam inlet line, 31 is steam outlet line, 32 is vacuum line, 33 is lower fixing lug, and 34 is liquid inlet line. Detailed Implementation
[0021] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.
[0022] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a central A-axis method, and the positional relationships such as front, back, top, bottom, left, and right are determined based on the layout direction of the attached diagram in the instruction manual.
[0023] The present invention will be further described below with reference to the embodiments and accompanying drawings:
[0024] Example 1: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the acetylene gas recovery system includes a flash tank 1, a baffle assembly, a liquid inlet pipe 2, a gas phase outlet pipe 3, and a liquid phase outlet pipe 4. The flash tank 1 has a gas phase outlet pipe 3 at its top and a liquid phase outlet pipe 4 at its bottom. The upper outer side of the flash tank 1 has a liquid inlet pipe 2 with its inner end located inside the flash tank 1. At least one set of baffle assemblies is provided at intervals between the upper and lower parts of the flash tank 1, corresponding to the position below the liquid inlet pipe 2. Each baffle assembly includes an upper liquid distributor and a lower liquid distributor. The upper liquid distributor can guide the liquid from the center to the outer periphery, and the lower liquid distributor can guide the liquid from the outer periphery to the center. During use, by setting at least one set of baffle components, under the action of the upper liquid distributor and the lower liquid distributor, the waste sodium hypochlorite solution enters the flash tank 1 and continuously flows from the center to the outer periphery, from the outer periphery to the center, from the center to the outer periphery, and from the outer periphery to the center. This increases the specific surface area, prolongs the residence time of waste sodium hypochlorite in the flash tank 1, and reduces the solubility of acetylene, thereby improving the gas-liquid separation efficiency. This not only enables efficient recovery of acetylene gas but also promotes the recycling of sodium hypochlorite solution, saves water resources, and reduces the safety hazards of sodium hypochlorite solution compounding.
[0025] The above-mentioned acetylene gas recovery system can be further optimized and / or improved according to actual needs:
[0026] Example 2: As shown in the attached document Figure 1 , 2 As shown in Figures 3 and 4, the upper liquid distributor is a flow guide shroud 5, which is conical in shape with a smaller upper part and a larger lower part. The outer side of the flow guide shroud 5 is provided with several first flow holes 7 that are connected inside and outside. A liquid passage gap 9 is provided between the outer side of the lower end of the flow guide shroud 5 and the inner side of the flash tank 1. The lower liquid distributor is a flow guide plate 6, which is annular in shape. The upper side of the flow guide plate 6 is provided with several second flow holes 8 that are connected inside and outside. During operation, by setting up the flow guide hood 5, the waste sodium hypochlorite solution is guided from the center to the outer periphery, and flows downward through the first flow hole 7 and the liquid gap 9; by setting up the flow guide plate 6, the waste sodium hypochlorite solution is guided from the outer periphery to the center, and flows downward through the second flow hole 8 and the central through hole of the annular flow guide plate 6; by setting up multiple layers of flow guide hoods 5 and flow guide plates 6 with alternating vertical distribution, the waste sodium hypochlorite solution continuously flows from the center to the outer periphery, from the outer periphery to the center, from the center to the outer periphery, and from the outer periphery to the center after entering the flash tank 1, thereby increasing the specific surface area; by setting up the flow guide hood 5 and flow guide plate 6, the waste sodium hypochlorite solution is evenly distributed, increasing the contact area between the waste sodium hypochlorite solution and the gas phase, improving the flash evaporation efficiency, and removing acetylene gas more quickly.
[0027] Example 3: As shown in the attached document Figure 1 , 2As shown in Figures 3 and 4, the baffle assembly also includes an upper fixing block 10, an upper fixing ear 11, a lower fixing ring 12, and a lower fixing ear 33. At least two upper fixing blocks 10 are spaced circumferentially along the inner side of the flash tank 1 corresponding to each position of the flow guide shroud 5. An installation groove 14 is provided on the inner side of the middle of the upper fixing block 10. A first notch 13 communicating with the installation groove 14 is provided on the upper side of the upper fixing block 10, and a second notch communicating with the installation groove 14 is provided on the lower side of the upper fixing block 10. A device located within the installation groove 14 is fixedly installed on the outer side of the lower end of the flow guide shroud 5. Upper fixing lug 11; a lower fixing ring 12 is fixedly installed on the inner side of the flash tank 1 corresponding to each position of the guide plate 6. The inner side of the middle part of the lower fixing ring 12 is provided with a mounting ring groove 16. At least two lower fixing lugs 33 are provided on the outer side of the guide plate 6 along the circumference and located in the mounting ring groove 16. The upper side of the lower fixing ring 12 corresponding to each position of the lower fixing lug 33 is provided with a third notch 15 that can communicate with the mounting ring groove 16. The lower side of the lower fixing ring 12 corresponding to each position of the lower fixing lug 33 is provided with a fourth notch that can communicate with the mounting ring groove 16. During use, by setting the first notch 13, after the upper fixing ear 11 is inserted into the mounting groove 14, the guide shroud 5 is rotated to make the upper fixing ear 11 misaligned with the second notch, so that the guide shroud 5 is limited and installed in the flash tank 1; by setting the third notch 15, after the lower fixing ear 33 is inserted into the mounting ring groove 16, the guide plate 6 is rotated to make the lower fixing ear 33 misaligned with the fourth notch, so that the guide plate 6 is limited and installed in the flash tank 1; by setting the first notch 13 and the second notch, it is easy for the guide plate 6 to pass through the upper fixing block 10 and then be inserted into the mounting ring groove 16 through the third notch 15; by setting the third notch 15 and the fourth notch, it is easy for the guide shroud 5 to pass through the lower fixing ring 12 and then be inserted into the mounting groove 14 through the first notch 13.
[0028] Example 4: As shown in the appendix Figure 1 , 2 As shown in Figures 3 and 4, a mist eliminator 17 is also included. The mist eliminator 17 is fixedly installed on the inner side of the upper part of the flash tank 1, corresponding to the position above the liquid inlet pipe 2. During use, ethane gas may carry liquid hydrocarbon droplets during flash evaporation. The mist eliminator 17 can effectively capture these droplets, preventing them from flowing out of the tank with the gas. By removing liquid hydrocarbon droplets from the gas, it helps improve the purity of the ethane at the outlet, which is crucial for the stability of subsequent processes and product quality. Furthermore, the mist eliminator 17 is typically made of materials such as metal mesh, fiber beds, or corrugated plates, which provide numerous fine channels or surfaces, allowing droplets in the gas to be captured as they pass through and returned to the liquid phase portion of the tank.
[0029] Example 5: As shown in the attached document Figure 1 , 2As shown in Figures 3 and 4, a manhole 18 is also included, which is located on the top of the flash tank 1. During use, the manhole 18 provides a passage into the tank, allowing maintenance personnel to enter the tank for repair, inspection, or replacement of internal components. In addition, during the operation of the flash tank 1, deposits or scale may be generated. The presence of the manhole 18 allows personnel to enter the tank for thorough cleaning and maintenance to ensure the normal operation of the equipment.
[0030] Example 6: As attached Figure 1 , 2As shown in Figures 3 and 4, the system also includes a buffer tank 19, a preheater 20, a cooler 21, a vacuum pump 22, a flow meter 23, a flow regulating valve 24, a thermometer 25, a temperature regulator 26, a level gauge 27, and a level control valve 28. The buffer tank 19 has an inlet pipe 34, and the outlet of the buffer tank 19 is fixedly connected to the medium inlet of the preheater 20 via an outlet pipe 29. The medium outlet of the preheater 20 is fixedly connected to the inlet of the inlet pipe 2, and the heat exchange medium inlet of the preheater 20 is fixedly connected to a steam inlet pipe. Line 30, the outlet of the heat exchange medium of the preheater 20 is fixedly connected to the steam outlet pipeline 31, the outlet of the gas phase outlet pipe 3 is fixedly connected to the medium inlet of the cooler 21, and the outlet of the medium of the cooler 21 is fixedly connected to the inlet of the vacuum pump 22 by a vacuum pipeline 32; the liquid inlet pipeline 34 is equipped with a flow meter 23 and a flow regulating valve 24, the flash tank 1 is equipped with a level gauge 27, the liquid phase outlet pipe 4 is equipped with a level control valve 28, the steam inlet pipeline 30 is equipped with a temperature regulator 26, and the liquid inlet pipe 2 is equipped with a thermometer 25. During operation, the flow rate of the waste sodium hypochlorite solution entering the buffer tank 19 is controlled by the flow meter 23 and the flow regulating valve 24 to ensure stable and controllable flow. The liquid level in the flash tank 1 is controlled by the level gauge 27 and the level control valve 28 to ensure stable and controllable liquid level. The temperature gauge 25 is installed on the inlet pipe 2 to monitor the temperature of the waste sodium hypochlorite solution flowing through it. The temperature regulator 26 is installed on the steam inlet pipeline 30 and automatically adjusts the steam flow rate according to the reading of the thermometer 25, thereby adjusting the temperature of the waste sodium hypochlorite solution to reach the predetermined temperature value. By increasing the temperature of the waste sodium hypochlorite solution, the solubility of acetylene gas in water can be reduced, thereby improving the acetylene gas removal effect. The temperature regulator 26 can control the temperature of the waste sodium hypochlorite solution entering the flash tank 1 to ensure that it achieves the best removal effect during its residence time in the flash tank 1. Heater 20 allows the waste sodium hypochlorite solution to exchange heat with a heat source (such as steam), transferring heat to the waste sodium hypochlorite solution and raising its temperature. After preheating, the waste sodium hypochlorite solution enters flash tank 1, making flash evaporation more likely and releasing acetylene gas from the solution. Cooler 21 cools the gas phase (mainly containing acetylene gas and water vapor) output from the top gas phase outlet pipe 3 of flash tank 1, lowering its temperature. Water vapor condenses into droplets and is removed, resulting in drier acetylene gas. This improves the purity of the acetylene gas, which is beneficial for subsequent acetylene gas treatment and utilization. The dry acetylene gas also reduces corrosion and damage to downstream equipment (such as vacuum pump 22). Vacuum pump 22 extracts acetylene gas and provides a negative pressure environment, improving acetylene gas recovery efficiency and preventing its accumulation in flash tank 1, thus ensuring stable system operation.
[0031] The above technical features constitute the preferred embodiment of this utility model, which has strong adaptability and the best implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.
Claims
1. An acetylene gas recovery system, characterized in that... It includes a flash tank, baffle assembly, inlet pipe, gas phase outlet pipe and liquid phase outlet pipe. The flash tank has a gas phase outlet pipe at the top and a liquid phase outlet pipe at the bottom. The upper outer side of the flash tank has an inlet pipe with its inner end located inside the flash tank. At least one set of baffle assembly is arranged vertically at intervals inside the flash tank corresponding to the position below the inlet pipe. Each baffle assembly includes an upper liquid distributor and a lower liquid distributor. The upper liquid distributor can guide the liquid from the center to the periphery, and the lower liquid distributor can guide the liquid from the periphery to the center.
2. The acetylene gas recovery system according to claim 1, characterized in that... The upper liquid distributor is a flow guide shroud, which is conical in shape with a smaller top and a larger bottom. Several first flow passages are provided on the outer side of the flow guide shroud, and a liquid passage gap is provided between the outer side of the lower end of the flow guide shroud and the inner side of the flash tank. The lower liquid distributor is a flow guide plate, which is circular in shape. Several second flow passages are provided on the upper side of the flow guide plate, which is vertically connected.
3. The acetylene gas recovery system according to claim 2, characterized in that... The inlet pipe includes a straight inlet pipe and an inlet bend pipe. The upper outer side of the flash tank is provided with an inlet straight pipe with an inlet bend pipe fixedly installed at the inner end. The outlet end of the inlet bend pipe is located on the lower side and above the top of the flow guide shroud.
4. The acetylene gas recovery system according to claim 2 or 3, characterized in that... The baffle assembly also includes an upper fixing block, an upper fixing ear, a lower fixing ring, and a lower fixing ear. At least two upper fixing blocks are provided circumferentially at intervals on the inner side of the flash tank corresponding to each flow guide shroud position. The upper fixing block has a mounting groove on its inner side in the middle, a first notch on its upper side that can communicate with the mounting groove, and a second notch on its lower side that can communicate with the mounting groove. An upper fixing ear located in the mounting groove is fixedly installed on the outer side of the lower end of the flow guide shroud. A lower fixing ring is fixedly installed on the inner side of the flash tank corresponding to each flow guide plate position. The lower fixing ring has a mounting ring groove on its inner side in the middle, and at least two lower fixing ears located in the mounting ring groove are provided circumferentially at intervals on the outer side of the flow guide plate. A third notch on the upper side of the lower fixing ring corresponding to each lower fixing ear position can communicate with the mounting ring groove, and a fourth notch on the lower side of the lower fixing ring corresponding to each lower fixing ear position can communicate with the mounting ring groove.
5. The acetylene gas recovery system according to claim 1, 2, or 3, characterized in that... It also includes a mist eliminator, which is fixedly installed on the inner side of the upper part of the flash tank above the liquid inlet pipe.
6. The acetylene gas recovery system according to claim 4, characterized in that... It also includes a mist eliminator, which is fixedly installed on the inner side of the upper part of the flash tank above the liquid inlet pipe.
7. The acetylene gas recovery system according to claim 1, 2, 3, or 6, characterized in that... It also includes a level gauge and a manhole. The level gauge is located on the lower outer side of the flash tank, and the manhole is located on the top of the flash tank.
8. The acetylene gas recovery system according to claim 4, characterized in that... It also includes a manhole, which is located on the top of the flash tank.
9. The acetylene gas recovery system according to claim 5, characterized in that... It also includes a manhole, which is located on the top of the flash tank.
10. The acetylene gas recovery system according to claim 1, 2, 3, 6, 8, or 9, characterized in that... It also includes a buffer tank, a preheater, a cooler, a vacuum pump, a flow meter, a flow regulating valve, a thermometer, a temperature regulator, a level gauge, and a level control valve. The buffer tank inlet is equipped with a liquid inlet pipeline, and the buffer tank outlet is fixedly connected to the preheater medium inlet with a liquid outlet pipeline. The preheater medium outlet is fixedly connected to the inlet of the liquid inlet pipeline. The preheater heat exchange medium inlet is fixedly connected to a steam inlet pipeline, and the preheater heat exchange medium outlet is fixedly connected to a steam outlet pipeline. The outlet of the vapor phase outlet pipe is fixedly connected to the cooler medium inlet, and the cooler medium outlet is fixedly connected to the vacuum pump inlet with a vacuum pipeline. A flow meter and a flow regulating valve are installed on the liquid inlet pipeline, a level gauge is installed on the flash tank, a level control valve is installed on the liquid phase outlet pipe, a temperature regulator is installed on the steam inlet pipeline, and a thermometer is installed on the liquid inlet pipeline.