A vaporization separator

Abstract

The vaporization separator comprises a tank body, a partition plate, a heat exchange pipe and a wire mesh demister, the partition plate comprises a heat transfer plate and a guide plate, the heat transfer plate is a horizontal plate, the guide plate comprises a vertical plate connected with the heat transfer plate perpendicularly and an inclined plate connected with the upper end of the vertical plate and extending upward and outward, the inner cavity of the tank body is divided into a vaporization cavity, a feeding cavity and a separation cavity, the heat exchange pipe is in a U shape and vertically arranged below the heat transfer plate, the two ends of the heat exchange pipe penetrate the heat transfer plate on the two sides of the vertical plate respectively, the feeding cavity and the separation cavity are communicated, thereby realizing shell and tube heat exchange, the wire mesh demister is arranged above the inclined plate and attached to the inner wall of the tank body, liquid water in the process gas can be removed, when the liquid water drops, the inclined plate can guide the liquid water to gather on the heat transfer plate at the bottom of the separation cavity and vaporize again, thereby ensuring that the molar ratio of methanol to water vapor in the process gas does not fluctuate greatly, and the heat of the shell and tube heat exchange is fully utilized to remove the liquid water in the process gas.

Description

Technical Field

[0001] This invention belongs to the field of vaporization separation technology, specifically relating to a vaporization separator for a methanol steam reforming hydrogen production system. Background Technology

[0002] Methanol steam reforming for hydrogen production is a hydrogen production technology that emerged in the 1980s. It involves the cracking and conversion of methanol and steam into hydrogen and carbon dioxide under the action of a catalyst. It is simple and convenient to operate, the raw materials are easy to obtain, the reaction conditions are mild and the cost is low. It is currently the most mature and widely used hydrogen production method.

[0003] Methanol-water vapor reforming for hydrogen production requires controlling the molar ratio of methanol to water vapor to achieve maximum hydrogen production. In hydrogen production systems, since the theoretical operating temperature of the catalyst is between 200℃ and 280℃ and the pressure is between 0.5MPa and 1.5MPa, the temperature and pressure of the process gases (methanol and water vapor) fed into the catalyst should conform to the above range. However, during the heating and pressurization process, the vaporization temperature of water is relatively high (up to 201.37℃), which easily leads to incomplete vaporization. The liquid water droplets remaining in the process gas can poison the catalyst and reduce hydrogen production efficiency. Most existing hydrogen production systems solve this problem by adding a superheater after the vaporizer. This method increases the volume and floor space of the hydrogen production system. At the same time, its pipelines are long and there are many joints, resulting in a high risk of leakage. The additional superheater also increases manufacturing and operating costs.

[0004] There are also solutions that add a gas-liquid separator at the inlet of the pipeline connecting the catalyst. For example, Chinese patent CN118403572A discloses such a hydrogen production system. However, this solution significantly reduces the passage area of ​​the process gas, resulting in low hydrogen production and difficulty in fully vaporizing the separated liquid water, which fails to meet the requirements of hydrogen production stations for hydrogen production volume and efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome one or more disadvantages in the prior art and provide a vaporization separator for a methanol steam reforming hydrogen production system.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is a vaporization separator, comprising: Tank body; Baffles, heat exchange tubes, and wire mesh demisters are installed inside the tank. The baffle includes a heat transfer plate and a guide plate. The heat transfer plate is a horizontal plate, and the guide plate includes a vertical plate and an inclined plate. The lower end of the vertical plate is vertically connected to the heat transfer plate, and the lower end of the inclined plate is connected to the upper end of the vertical plate. The upper end of the inclined plate extends upward and outward. The heat transfer plate, the vertical plate, and the inclined plate divide the inner cavity of the tank into a vaporization chamber, a feeding chamber, and a separation chamber. The vaporization chamber is located below the heat transfer plate, the feeding chamber is located above the heat transfer plate and below the inclined plate, and is located on one side of the vertical plate, and the separation chamber is located above the heat transfer plate and the inclined plate, and is located on the other side of the vertical plate. The heat exchange tube is U-shaped and vertically installed below the heat transfer plate. One end of the tube passes through the heat transfer plate on one side of the vertical plate, and the other end passes through the heat transfer plate on the other side of the vertical plate, so that the feed chamber and the separation chamber are connected. The wire mesh demister is located above the inclined plate and is attached to the inner wall of the tank. The tank is also provided with a medium inlet, a medium outlet, a feed port, and a discharge port. The medium inlet is located at the bottom of the tank. The medium outlet is lower than the heat transfer plate and close to the heat transfer plate. The medium inlet and the medium outlet are connected to the vaporization chamber. The feed port is higher than the heat transfer plate and lower than the inclined plate. The feed port is connected to the feed chamber. The discharge port is located at the top of the tank and higher than the wire mesh demister. The discharge port is connected to the separation chamber.

[0007] Preferably, the heat transfer plates located on both sides of the vertical plate are of equal size.

[0008] More preferably, the heat exchange tubes are symmetrically distributed on both sides of the vertical plate.

[0009] Preferably, the tank body is divided into an upper tank body and a lower tank body, and the edge of the heat transfer plate extends horizontally outward and is clamped between the flanges on the opposite sides of the upper tank body and the lower tank body.

[0010] More preferably, the heat transfer plate is provided with an upwardly protruding annular strip, the annular strip is coaxial with the tank body, the annular strip is located on the outer side of the inner wall of the tank body and corresponds to the position of the annular groove on the flange.

[0011] More preferably, a sealing gasket is clamped between the flange on the upper tank and the lower tank and the heat transfer plate.

[0012] More preferably, the upper tank body includes a first tank body located below and a second tank body located above, and the ends of the first tank body and the second tank body facing each other are provided with flanges, and a sealing gasket is clamped between the two flanges.

[0013] More preferably, the wire mesh demister is disposed inside the second tank.

[0014] More preferably, the upper edge of the inclined plate is not higher than the upper end surface of the first tank.

[0015] More preferably, the lower tank body is connected to supports on both sides, and the supports are lower than the medium outlet.

[0016] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The vaporization separator provided by this invention includes a tank, a baffle plate, heat exchange tubes, and a wire mesh demister. The baffle plate includes a heat transfer plate and a guide plate. By making the heat transfer plate horizontal and the guide plate including a vertical plate connected perpendicularly to the heat transfer plate and an inclined plate connected to the upper end of the vertical plate and extending upward and outward, the inner cavity of the tank can be divided into a vaporization chamber, a feeding chamber, and a separation chamber. By making the heat exchange tubes U-shaped and vertically arranged below the heat transfer plate, with both ends penetrating the heat transfer plates on both sides of the vertical plate, the feeding chamber and the separation chamber can be connected, thereby achieving... The system uses shell-and-tube heat exchange, with a wire mesh demister positioned above an inclined plate and attached to the inner wall of the tank. This removes liquid water from the process gas. As the water drips, the inclined plate guides it, causing it to collect on the heat transfer plate at the bottom of the separation chamber for re-vaporization. This ensures that the molar ratio of methanol to water vapor in the process gas does not fluctuate significantly, and fully utilizes the heat from the shell-and-tube heat exchange to remove liquid water from the process gas. The system is compact, small in size, has a low risk of leakage, and is low in cost, meeting the requirements of hydrogen production stations for hydrogen production capacity and efficiency. Attached Figure Description

[0017] Figure 1 This is a front view schematic diagram of a preferred embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A left-side view diagram.

[0019] Figure 3 yes Figure 2 Cross-sectional view along the AA direction.

[0020] Figure 4 yes Figure 1 A three-dimensional schematic diagram.

[0021] Figure 5 yes Figure 4 A schematic diagram of the assembly and disassembly.

[0022] Figure 6 This is another embodiment of the present invention. Figure 2 Cross-sectional view along the AA direction.

[0023] Wherein: 10. Tank body; 101. Vaporization chamber; 102. Feeding chamber; 103. Separation chamber; 10a. Medium inlet; 10b. Medium outlet; 10c. Feed inlet; 10d. Discharge outlet; 11. Upper tank body; 12. Lower tank body; 121. Support; 13. Flange; 14. First tank body; 15. Second tank body; 16. Flange; 17. Sealing gasket; 18. Annular groove; 19. Flange; 21. Heat transfer plate; 22. Vertical plate; 23. Inclined plate; 24. Annular strip; 30. Heat exchange tube; 40. Wire mesh demister. Detailed Implementation

[0024] like Figures 1 to 5As shown, the vaporization separator provided by this invention is used in a methanol steam reforming hydrogen production system. The vaporization separator includes: a tank body 10, a baffle plate, heat exchange tubes 30, and a wire mesh demister 40. The tank body 10 is divided into an upper tank body 11 and a lower tank body 12 located below the upper tank body 11. Flanges 13 are provided at the opposite ends of both the upper tank body 11 and the lower tank body 12. The upper tank body 11 and the lower tank body 12 are connected and locked together by the flanges 13. The bottom of the lower tank body 12 is an elliptical end cap. The upper tank body 11 includes a lower first tank body 14 and an upper... The second tank 15 and the first tank 14 are both equipped with flanges 16 at their opposite ends. The first tank 14 and the second tank 15 are locked together by the flanges 16. The top of the second tank 15 is an elliptical head. A baffle is provided inside the tank 10. The baffle includes a heat transfer plate 21 and a guide plate. The heat transfer plate 21 is a horizontal plate. The guide plate includes a vertical plate 22 and an inclined plate 23. The lower end of the vertical plate 22 is perpendicularly connected to the heat transfer plate 21. The lower end of the inclined plate 23 is connected to the upper end of the vertical plate 22. The upper end of the inclined plate 23 extends upward and outward at an angle. The heat transfer plate 21, vertical plate 22, and inclined plate 23 divide the inner cavity of the tank 10 into a vaporization chamber 101, a feeding chamber 102, and a separation chamber 103. The vaporization chamber 101 is formed by the heat transfer plate 21 and the inner wall of the tank 10, and is located below the heat transfer plate 21. The feeding chamber 102 is formed by the heat transfer plate 21, vertical plate 22, inclined plate 23, and the inner wall of the tank 10, and is located above the heat transfer plate 21 and below the inclined plate 23, and is located on one side of the vertical plate 22. The separation chamber 103 is formed by the vertical plate 22, inclined plate 23, and the inner wall of the tank 10. The inner wall of the tank 10 forms a separation chamber 103 located above the heat transfer plate 21 and the inclined plate 23, and on the other side of the vertical plate 22; the heat exchange tube 30 is installed inside the tank 10, and the heat exchange tube 30 is U-shaped and vertically installed below the heat transfer plate 21. One end of the heat exchange tube 30 passes through the heat transfer plate 21 on the left side of the vertical plate 22, and the other end passes through the heat transfer plate 21 on the right side of the vertical plate 22, so that the feed chamber 102 is connected to the separation chamber 103; the wire mesh demister 40 is installed inside the second tank 15, and the wire mesh demister 40 is located above the inclined plate 23 and is attached to the inner wall of the tank 10.The tank body 10 is also provided with a medium inlet 10a, a medium outlet 10b, a feed inlet 10c, and a discharge outlet 10d. The medium inlet 10a is located at the bottom of the lower tank body 12, and the medium outlet 10b is located on the lower tank body 12. The medium outlet 10b is lower than the heat transfer plate 21 and close to the heat transfer plate 21. The feed inlet 10c is located on the first tank body 14. The feed inlet 10c is higher than the heat transfer plate 21 and lower than the inclined plate 23. The discharge outlet 10d is located at the top of the second tank body 15 and higher than the wire mesh demister 40. The medium inlet 10a and the medium outlet 10b are connected to the vaporization chamber 101. The feed inlet 10c is connected to the feed chamber 102. The discharge outlet 10d is connected to the separation chamber 103. The heat transfer medium (high temperature heat transfer oil) enters from the medium inlet 10a and flows out from the medium outlet 10b. Methanol and demineralized water enter from the feed inlet 10c. The process gas (methanol and water vapor) flows out from the discharge outlet 10d. ;

[0025] The advantages of this design are that it allows for both connection between the feed chamber 102 and the separation chamber 103, and isolation between the vaporization chamber 101 and the feed chamber 102 and separation chamber 103, enabling shell-and-tube heat exchange in conjunction with the heat exchange tube 30. Furthermore, it allows for the removal of liquid water from the process gas via the wire mesh demister 40. As the liquid water drips, the inclined plate 23 guides it, causing it to collect entirely on the heat transfer plate 21 at the bottom of the separation chamber 103 for re-vaporization. This ensures that the molar ratio of methanol to water vapor in the process gas does not fluctuate significantly, and fully utilizes the heat from the shell-and-tube heat exchange to remove liquid water from the process gas. This vaporization separator is compact, small in size, occupies little space, requires fewer pipes, has a low risk of leakage, and is low in cost. It also has a large throughput area, resulting in relatively high hydrogen production. The liquid water is fully vaporized, meeting the requirements of hydrogen production stations for both production volume and efficiency.

[0026] In this embodiment, the heat transfer plates 21 located on both sides of the vertical plate 22 are of equal size. At the same time, the edges of the heat transfer plates 21 extend horizontally outward and are clamped between the flanges 13 on the opposite sides of the upper tank 11 and the lower tank 12. To ensure the sealing effect, a sealing gasket 17 is clamped between the flanges 13 on the upper tank 11 and the lower tank 12 and the heat transfer plates 21. Furthermore, the heat transfer plates 21 are provided with an upwardly protruding annular strip 24. The annular strip 24 is coaxial with the tank 10 and is located on the outer side of the inner wall of the tank 10 and corresponds to the position of the annular groove 18 on the flange 13. Furthermore, the ends of the first tank 14 and the second tank 15 on the opposite sides are provided with flanges 19, and a sealing gasket is also clamped between these two flanges 19.

[0027] In this embodiment, the heat exchange tubes 30 are symmetrically distributed on both sides of the vertical plate 22, and the upper edge of the inclined plate 23 is not higher than the upper end face of the first tank 14 to facilitate the layout. Furthermore, the lower tank 12 is connected to the two sides of the support 121, and the support 121 is lower than the medium outlet 10b.

[0028] like Figure 6As shown, in another embodiment, the end of the heat exchange tube 30 that communicates with the separation chamber 103 is higher than the heat transfer plate 21, and its height is greater than or equal to 1.5 times the height of the annular strip 24, so as to prevent the liquid water collected on the heat transfer plate 21 at the bottom of the separation chamber 103 from directly entering the heat exchange tube 30 and affecting the vaporization of methanol and demineralized water.

[0029] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A vaporization separator, comprising: Tank body; Baffles, heat exchange tubes, and wire mesh demisters are installed inside the tank. Its features are: The partition includes a heat transfer plate and a guide plate. The heat transfer plate is a horizontal plate, and the guide plate includes a vertical plate and an inclined plate. The lower end of the vertical plate is vertically connected to the heat transfer plate, and the lower end of the inclined plate is connected to the upper end of the vertical plate. The upper end of the inclined plate extends upward and outward. The heat transfer plate, vertical plate, and inclined plate divide the inner cavity of the tank into a vaporization chamber, a feeding chamber, and a separation chamber. The vaporization chamber is located below the heat transfer plate, the feeding chamber is located above the heat transfer plate and below the inclined plate, and is located on one side of the vertical plate, and the separation chamber is located above the heat transfer plate and the inclined plate, and is located on the other side of the vertical plate. The heat exchange tube is U-shaped and vertically installed below the heat transfer plate. One end of the tube passes through the heat transfer plate on one side of the vertical plate, and the other end passes through the heat transfer plate on the other side of the vertical plate, so that the feeding chamber and the separation chamber are connected. The wire mesh demister is located above the inclined plate and is attached to the inner wall of the tank.

2. The vaporization separator according to claim 1, characterized in that: The heat transfer plates located on both sides of the vertical plate are of equal size.

3. The vaporization separator according to claim 2, characterized in that: The heat exchange tubes are symmetrically distributed on both sides of the vertical plate.

4. The vaporization separator according to claim 1, characterized in that: The tank is divided into an upper tank and a lower tank. The edge of the heat transfer plate extends horizontally outward and is clamped between the flanges on the opposite sides of the upper tank and the lower tank.

5. The vaporization separator according to claim 4, characterized in that: The heat transfer plate is provided with an upwardly protruding annular strip, which is coaxial with the tank body and located on the outer side of the inner wall of the tank body, corresponding to the position of the annular groove on the flange.

6. The vaporization separator according to claim 5, characterized in that: A sealing gasket is clamped between the flange on the upper tank and the lower tank and the heat transfer plate.

7. The vaporization separator according to claim 4, characterized in that: The upper tank body includes a first tank body located below and a second tank body located above. The ends of the first tank body and the second tank body facing each other are provided with flanges, and a sealing gasket is clamped between the two flanges.

8. The vaporization separator according to claim 7, characterized in that: The wire mesh demister is located inside the second tank.

9. The vaporization separator according to claim 7, characterized in that: The upper edge of the inclined plate is not higher than the upper surface of the first tank.

10. The vaporization separator according to claim 4, characterized in that: The lower tank is connected to supports on both sides.

Images