Multistage rectifying device for green methanol preparation

Abstract

The present application relates to the field of methanol production, and discloses a multistage rectification device for green methanol preparation, which comprises a rectification tower, a condensation assembly, a liquid storage tank and a pump, a plurality of tray assemblies are arranged in the vertical direction in the rectification tower, the tray assembly comprises a tray plate and a flow guide sleeve plate, the outer cylindrical surface of the tray plate is connected with the inner wall of the rectification tower, a convex pipe is arranged at the middle position of the end surface of the tray plate, the region between the upper closed end of the flow guide sleeve plate and the tray plate is named as a first flow guide area, the region between the outer wall of the flow guide sleeve plate and the inner wall of the rectification tower is named as a second flow guide area, the lower open end of the flow guide sleeve plate is provided with a connecting port, the lower open end of the flow guide sleeve plate of the upper tray assembly is connected with the upper surface of the tray plate of the lower tray assembly in the two adjacent tray assemblies, a plurality of sieve holes are arranged in the upper closed end of the flow guide sleeve plate in an array, a fixed bubble cap is arranged at the upper hole of the sieve hole, and the upper end of the fixed bubble cap is located above the tray plate.

Description

Technical Field

[0001] This invention relates to the field of methanol production, specifically to the field of methanol distillation, and particularly to a multi-stage distillation apparatus for green methanol production. Background Technology

[0002] Multistage methanol distillation is a core technology for energy conservation and emission reduction in modern coal chemical industry and methanol production. Simply put, its principle is to utilize the latent heat of condensation of methanol vapor at the top of the distillation column under different pressures as a heat source for the reboiler of adjacent columns, thus achieving cascaded energy utilization.

[0003] The video "Working Principle of Distillation Column" published by the Toutiao account "Shihuayuan Editor" on December 28, 2021, explains in detail the principle of methanol distillation. It uses a feed heat exchanger to heat crude methanol and a reboiler to supply steam flowing from bottom to top to the distillation column, thereby vaporizing the methanol component of the crude methanol. The vaporized methanol is condensed by a condenser set at the top of the column to obtain liquid methanol. Part of the liquid methanol is refluxed and part is produced. In a distillation column, steam enters the riser of the bubble cap from bottom to top, dispersing through the slits of the bubble cap into the liquid layer within the bubble cap. This contact with the liquid provides a significant amount of heat for heat and mass transfer between the gas and liquid phases. After entering the liquid layer, the steam rises as bubbles. The heat exchange effect between the bubbles and the liquid layer is limited by the bubble size; larger bubbles result in relatively poor heat exchange, while smaller bubbles result in relatively good heat exchange. Since the function of the steam bubbles is to provide heat to the liquid layer, causing methanol to vaporize, smaller bubbles in the liquid layer have a longer residence time, leading to better methanol distillation. However, existing technologies simply disperse steam into the liquid layer without improving bubble formation and the overflow of gaseous methanol from the liquid layer. Therefore, this invention proposes a multi-stage distillation device for green methanol production, which effectively improves the heat exchange effect between bubbles and the liquid layer and accelerates the overflow of gaseous methanol from the liquid layer, thereby improving the distillation effect and efficiency of methanol. Summary of the Invention

[0004] To address the problems mentioned in the background above, the present invention provides a multi-stage distillation apparatus for green methanol production.

[0005] To achieve the above-mentioned technical objectives, the technical solution adopted by the present invention is as follows.

[0006] A multi-stage distillation apparatus for green methanol production includes a distillation column, a condenser assembly, a storage tank, and a pump. Several tray assemblies are arranged in a vertical array inside the distillation column.

[0007] The tray assembly includes a tray plate and a flow guide sleeve located below the tray plate. The outer circular surface of the tray plate is connected to the inner wall of the distillation column. A core hole is provided at the middle position of the end face of the tray plate, and a protruding tube is provided at the upper opening of the core hole.

[0008] The flow guide sleeve is a shell shape with a closed upper end and an open lower end. The area between the closed upper end of the flow guide sleeve and the tray is named flow guide zone one, and the area between the outer wall of the flow guide sleeve and the inner wall of the distillation column is named flow guide zone two. The lower open end of the flow guide sleeve is provided with a connection port, which penetrates the inner and outer walls of the flow guide sleeve.

[0009] In two adjacent tray assemblies, the lower opening end of the guide sleeve of the upper tray assembly is connected to the upper surface of the tray plate of the lower tray assembly.

[0010] The upper closed end array of the flow guide sleeve is provided with several sieve holes, and a fixed bubble cap is provided at the upper opening of the sieve hole. The upper end of the fixed bubble cap is located above the tray plate, and the tray plate is provided with avoidance holes for avoiding the fixed bubble cap.

[0011] As a further improvement and optimization of the present invention, a feed ring pipe is provided on the outer circular surface of the distillation column, a feed heat exchanger is connected to the outer circular surface of the feed ring pipe, and a reboiler is provided at the bottom of the distillation column.

[0012] The outer wall of the distillation column is provided with side holes, which are used to connect the flow guide zone 2 of the tray assembly located in the middle of the distillation column with the feed ring pipe.

[0013] As a further improvement and optimization of the present invention, multiple connection ports are arranged in an array along the circumferential direction of the guide sleeve.

[0014] As a further improvement and optimization of the present invention, a rotating cover is installed on the upper open end of the fixed blister via an inner bracket. The rotating cover is coaxially located outside the fixed blister, and the lower closed end of the rotating cover is located above the fixed blister. The height of the lower open end of the rotating cover is lower than the height of the upper end of the convex tube.

[0015] As a further improvement and optimization of the present invention, the inner wall of the rotating shroud is provided with propeller blades. When gas flows into the rotating shroud through the fixed bubble, the rotating shroud rotates under the cooperation of gas flow and propeller blades.

[0016] As a further improvement and optimization of the present invention, the outer wall of the rotating cover is provided with multiple stirring blades arranged in an array along the circumferential direction.

[0017] As a further improvement and optimization of the present invention, the inlet end of the pump is connected to the storage tank through an input pipe, and the outlet end of the pump is connected to the top of the distillation column through an output pipe.

[0018] The top of the distillation column is connected to the condenser assembly via an inlet pipe, and the condenser assembly is connected to the liquid storage tank via a connecting pipe.

[0019] As a further improvement and optimization of the present invention, the condensation assembly includes a condensation tank and an annular shell;

[0020] The condenser is equipped with two annular baffles, which radially divide the annular inner cavity of the condenser into three non-communicating annular regions, namely the outer condensing ring region, the middle condensing ring region, and the inner condensing ring region from the outside to the inside.

[0021] Each of the three annular regions is equipped with several partition plates, and these partition plates work together to form a channel within the annular region that is used for fluid flow and is arranged in a continuous, curved manner.

[0022] A connector is provided at the upper end of the annular region, and two connectors are arranged in an array along the circumference of the annular region.

[0023] The two inlets in the central condensation ring zone are respectively equipped with an inlet pipe and an exhaust pipe, and the inlet pipe is connected to the top of the distillation column;

[0024] An inlet pipe is provided between one connector in the outer condensing ring zone and one connector in the inner condensing ring zone, and an outlet pipe is provided between the other connector in the outer condensing ring zone and the other connector in the inner condensing ring zone. The flow trajectory of the fluid in the channel of the outer condensing ring zone is opposite to that of the fluid in the channel of the inner condensing ring zone.

[0025] The upper surface of the ring shell is provided with an annular fixing hole and the bottom of the condenser is set inside the annular fixing hole;

[0026] The bottom of the condenser tank extends with a convex ring plate, the bottom of which is connected to the bottom of the ring shell. The bottom of the convex ring plate has a side opening that penetrates the inner and outer walls of the convex ring plate.

[0027] A connection hole is provided at the bottom of the central condensing ring zone, and the connection hole is located inside the convex ring plate;

[0028] The upper surface of the annular shell extends with a raised edge, which is hollow inside and communicates with the inner cavity of the annular shell.

[0029] The bottom of the raised edge is equipped with a main drain valve, which is connected to the storage tank through a connecting pipe.

[0030] As a further improvement and optimization of the present invention, a secondary drain valve is provided at the bottom of the ring shell, and the end of the secondary drain valve is connected to the connecting pipe.

[0031] Compared with the prior art, the beneficial effects of this invention are as follows:

[0032] Technical effect 1: In this case, the liquid in the upper tray assembly flows into the lower tray assembly through the connection port, flows towards the center, and then continues to flow to the next lower tray assembly through the convex tube. In other words, in this case, the liquid flows from the periphery to the center. This flow method can significantly accelerate the overflow of gas in the liquid, that is, it can accelerate the overflow of gaseous methanol from the liquid, thereby improving the methanol distillation effect.

[0033] Technical effect 2: The steam provided by the reboiler flows upward and enters the liquid to form bubbles. During this process, it can drive the rotating shroud to rotate and stir the liquid through the stirring blades. Stirring can break up the bubbles, making them smaller and increasing the contact area between the bubbles and the liquid, thereby improving the heat exchange effect and allowing the methanol component to turn into gaseous state more quickly and overflow from the liquid.

[0034] Furthermore, part of the kinetic energy of the steam flow is used to drive the rotating shroud to rotate, which can reduce the initial velocity of the bubbles entering the liquid, that is, increase the residence time of the bubbles in the liquid, further improve the heat exchange effect, and make the methanol component turn into gaseous state more quickly and overflow from the liquid.

[0035] Technical effect 3: In this case, the liquid flows from the periphery to the center and then into the next layer. The rotating hood is evenly distributed in an array in the area between the periphery and the center, thus ensuring that all the liquid can be effectively stirred, further improving the effect of methanol components overflowing from the liquid. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the present invention;

[0037] Figure 2 This is a schematic diagram of a distillation column;

[0038] Figure 3 This is a cross-sectional view of a distillation column;

[0039] Figure 4 This is a schematic diagram of the tower tray assembly;

[0040] Figure 5 This is a schematic diagram of the rotating cover;

[0041] Figure 6 This is a schematic diagram of the condenser assembly;

[0042] Figure 7 This is a schematic diagram of a condenser tank;

[0043] Figure 8 This is a partial cross-sectional view of the condenser assembly;

[0044] Figure 9 This is a schematic diagram showing the unfolded shape of the annular region;

[0045] Figure 10 This is a schematic diagram of the fluid flow trajectories in the outer and inner condensation ring regions.

[0046] The labels in the attached diagram are:

[0047] 100. Distillation column; 101. Feed heat exchanger; 102. Reboiler; 103. Feed loop; 104. Tray assembly; 1041. Tray plate; 1042. Flow guide sleeve; 1043. Protruding tube; 1044. Connection port; 1045. Sieve hole; 1046. Fixed bubble cap; 1047. Rotating hood; 1048. Internal support; 1049. Propeller blade; 105. Stirring blade; 200. Condenser assembly; 201 1. Condensate tank; 2011. Outer condensing ring zone; 2012. Middle condensing ring zone; 2013. Inner condensing ring zone; 202. Air inlet pipe; 203. Exhaust pipe; 204. Liquid inlet pipe; 205. Liquid outlet pipe; 206. Ring shell; 207. Raised edge; 208. Main drain valve; 209. Secondary drain valve; 210. Raised ring plate; 211. Side port; 212. Connection hole; 213. Fan; 300. Liquid storage tank; 400. Pump. Detailed Implementation

[0048] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0049] Example 1

[0050] Reference Figures 1-10 A multi-stage distillation apparatus for green methanol production includes a distillation column 100, a condenser assembly 200, a storage tank 300, and a pump 400.

[0051] Reference Figure 2 and Figure 3 The distillation column 100 has several tray assemblies 104 arranged in a vertical array inside. The outer circular surface of the distillation column 100 is provided with a feed ring pipe 103, and the outer circular surface of the feed ring pipe 103 is connected to a feed heat exchanger 101. The bottom of the distillation column 100 is provided with a reboiler 102. It should be noted that the feed heat exchanger 101 and the reboiler 102 are both existing technologies and are not the core improvement of this case, so they will not be described in detail.

[0052] Reference Figure 4 The tray assembly 104 includes a tray plate 1041 and a flow guide sleeve 1042 located below the tray plate 1041.

[0053] The outer circular surface of the tray 1041 is connected to the inner wall of the distillation column 100. A core hole is provided at the middle position of the end face of the tray 1041, and a protruding tube 1043 is provided at the upper opening of the core hole.

[0054] The flow guide sleeve 1042 is a shell shape with a closed upper end and an open lower end. The area between the closed upper end of the flow guide sleeve 1042 and the tray 1041 is named flow guide zone one, and the area between the outer wall of the flow guide sleeve 1042 and the inner wall of the distillation column 100 is named flow guide zone two.

[0055] In two adjacent tray assemblies 104, the lower opening end of the flow guide sleeve 1042 of the upper tray assembly 104 is connected to the upper surface of the tray plate 1041 of the lower tray assembly 104.

[0056] The lower opening end face of the flow guide sleeve 1042 is provided with a connection port 1044, which penetrates the inner and outer walls of the flow guide sleeve 1042. Multiple connection ports 1044 are arranged in an array along the circumferential direction of the flow guide sleeve 1042.

[0057] The upper closed end face of the flow guide sleeve 1042 is arrayed with a number of sieve holes 1045. A fixed bubble cover 1046 is provided at the upper opening of the sieve hole 1045. The upper end of the fixed bubble cover 1046 is located above the tray plate 1041. The tray plate 1041 is provided with a clearance hole for avoiding the fixed bubble cover 1046.

[0058] A rotating cover 1047 is mounted on the upper open end of the fixed blister 1046 via an inner bracket 1048. The rotating cover 1047 is coaxially located outside the fixed blister 1046. The lower closed end of the rotating cover 1047 is located above the fixed blister 1046. The height of the lower open end of the rotating cover 1047 is lower than the height of the upper end of the convex tube 1043.

[0059] Reference Figure 5 The inner wall of the rotating cover 1047 is provided with a propeller blade 1049. When gas flows into the rotating cover 1047 through the fixed bubble cover 1046, the rotating cover 1047 rotates under the cooperation of gas flow and propeller blade 1049.

[0060] Multiple stirring blades 105 are arranged in an array along the circumferential direction on the outer wall of the rotating cover 1047.

[0061] The outer wall of the distillation column 100 is provided with side holes, which are used to connect the flow guide zone 2 of the tray assembly 104 located in the middle of the distillation column 100 with the feed ring pipe 103.

[0062] The inlet of pump 400 is connected to the storage tank 300 via an input pipe, and the outlet of pump 400 is connected to the top of distillation column 100 via an output pipe.

[0063] The top of the distillation column 100 is connected to the condenser assembly 200 via an inlet pipe 202, and the condenser assembly 200 is connected to the liquid storage tank 300 via a connecting pipe.

[0064] The working process of Example 1:

[0065] After being heated by the feed heat exchanger 101, the crude methanol liquid enters the second guide zone of the tray assembly 104 located in the middle of the distillation column 100 through the feed loop pipe 103. Then, it flows along the connection port 1044 of the tray assembly 104 to the tray plate 1041 of the tray assembly 104 below. As the liquid level rises, the liquid flows through the convex pipe 1043, the first guide zone, the second guide zone, and the connection port 1044 into the next tray assembly 104. It should be noted that in this case, the structure of the tray assembly 104 is improved, but the crude methanol liquid flows layer by layer from top to bottom, which is the prior art and will not be described in detail.

[0066] Meanwhile, the steam supplied by the reboiler 102 flows into the fixed bubble cap 1046 through the sieve holes 1045, enters the liquid through the area between the rotating cap 1047 and the fixed bubble cap 1046, and finally overflows as bubbles, continuing to flow upward. During this process, the steam, in cooperation with the propeller blades 1049, causes the rotating cap 1047 to rotate, and the stirring blades 105 agitate the liquid.

[0067] The methanol component that absorbs heat from the steam vaporizes into a gaseous state. The gaseous methanol then flows into the condenser assembly 200 through the inlet pipe 202, where it is condensed into a liquid and stored in the liquid storage tank 300.

[0068] Its technological advantages lie in:

[0069] Technical effect 1: In this case, the liquid in the upper tray assembly 104 flows into the lower tray assembly 104 through the connection port 1044, flows towards the center, and then continues to flow to the next lower tray assembly 104 through the convex tube 1043. In other words, in this case, the liquid flows from the periphery to the center. This flow method can significantly accelerate the overflow of gas in the liquid, that is, it can accelerate the overflow of gaseous methanol from the liquid, thereby improving the methanol distillation effect.

[0070] Technical effect 2: The steam provided by the reboiler 102 flows upward and enters the liquid to form bubbles. During this process, it can drive the rotating shroud 1047 to rotate. The stirring blades 105 can stir the liquid. Stirring can break up the bubbles, making them smaller and increasing the contact area between the bubbles and the liquid, thereby improving the heat exchange effect and allowing the methanol component to turn into gaseous state more quickly and overflow from the liquid.

[0071] Furthermore, part of the kinetic energy of the steam flow is used to drive the rotating shroud 1047 to rotate. Therefore, the initial velocity of the bubbles entering the liquid can be reduced, which means that the residence time of the bubbles in the liquid can be increased, further improving the heat exchange effect and making the methanol component turn into gaseous state more quickly and overflow from the liquid.

[0072] Technical effect 3: In this case, the liquid flows from the periphery to the center and then into the next layer. The rotating cover 1047 is evenly distributed in an array in the area between the periphery and the center, thus ensuring that all the liquid can be effectively stirred, further improving the effect of methanol components overflowing from the liquid.

[0073] Example 2

[0074] Reference Figures 6-8 The condensation assembly 200 includes a condenser tank 201 and an annular shell 206.

[0075] The condenser 201 is provided with two annular baffles. The two annular baffles divide the annular inner cavity of the condenser 201 into three non-communicating annular regions in a radial direction. From the outside to the inside, they are the outer condensing ring region 2011, the middle condensing ring region 2012, and the inner condensing ring region 2013.

[0076] Each of the three annular regions is equipped with several partition plates, which work together to form a continuously curved channel for fluid flow within the annular region.

[0077] It should be noted that truncating and unfolding the annular region results in a rectangle, as shown below. Figure 9 As shown, it is feasible and is existing technology to form a continuously curved channel with several partitions, so it will not be elaborated further.

[0078] A connector is provided at the upper end of the annular region, and two connectors are arranged in an array along the circumference of the annular region.

[0079] The two inlets of the central condensation ring zone 2012 are respectively equipped with an inlet pipe 202 and an exhaust pipe 203. The inlet pipe 202 is connected to the top of the distillation column 100.

[0080] An inlet pipe 204 is provided between one connector of the outer condensing ring 2011 and one connector of the inner condensing ring 2013, and an outlet pipe 205 is provided between the other connector of the outer condensing ring 2011 and the other connector of the inner condensing ring 2013. The flow trajectory of the fluid in the channel of the outer condensing ring 2011 is opposite to that of the fluid in the channel of the inner condensing ring 2013.

[0081] Reference Figure 8 The upper surface of the ring shell 206 is provided with an annular fixing hole, and the bottom of the condenser 201 is located inside the annular fixing hole.

[0082] The bottom of the condenser 201 extends with a convex ring plate 210. The bottom of the convex ring plate 210 is connected to the bottom of the ring shell 206. The bottom of the convex ring plate 210 is provided with a side opening 211, which penetrates the inner and outer walls of the convex ring plate 210.

[0083] A connection hole 212 is provided at the bottom of the central condensing ring region 2012, and the connection hole 212 is located inside the convex ring plate 210.

[0084] The upper surface of the annular shell 206 extends a raised edge 207, which is hollow inside and communicates with the inner cavity of the annular shell 206.

[0085] A main drain valve 208 is provided at the bottom of the raised edge 207, and the main drain valve 208 is connected to the storage tank 300 through a connecting pipe.

[0086] A secondary drain valve 209 is provided at the bottom of the annular shell 206, and the end of the secondary drain valve 209 is connected to the connecting pipe.

[0087] Furthermore, a fan 213 is also installed inside the annular shell 206 to achieve air cooling of the condenser tank 201, thereby improving the condensation effect through a combination of air cooling and water cooling.

[0088] The working process of Example 2:

[0089] Gaseous methanol enters the middle condensing ring zone 2012 through the inlet pipe 202 and flows within the channel of the middle condensing ring zone 2012. At the same time, two streams of cold water enter the channels of the outer condensing ring zone 2011 and the inner condensing ring zone 2013 through the liquid inlet pipe 204 respectively. With the help of the fan 213, the gaseous methanol is condensed. The condensed methanol falls into the ring shell 206 through the connecting hole 212, and finally enters the storage tank 300 through the flange 207, the main drain valve 208, and the connecting pipe.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-stage distillation apparatus for green methanol production, comprising a distillation column (100), a condenser assembly (200), a storage tank (300), and a pump (400), characterized in that, Several tray assemblies (104) are arranged in a vertical array inside the distillation column (100). The tray assembly (104) includes a tray plate (1041) and a flow guide sleeve (1042) located below the tray plate (1041). The outer circular surface of the tray plate (1041) is connected to the inner wall of the distillation column (100). A core hole is provided at the middle position of the end face of the tray plate (1041), and a protruding tube (1043) is provided at the upper opening of the core hole. The flow guide sleeve (1042) is a shell shape with a closed upper end and an open lower end. The area between the closed upper end of the flow guide sleeve (1042) and the tray plate (1041) is named flow guide zone one. The area between the outer wall of the flow guide sleeve (1042) and the inner wall of the distillation column (100) is named flow guide zone two. The lower open end of the flow guide sleeve (1042) is provided with a connection port (1044), which penetrates the inner and outer walls of the flow guide sleeve (1042). In two adjacent tray assemblies (104), the lower opening end of the flow guide sleeve (1042) of the upper tray assembly (104) is connected to the upper surface of the tray plate (1041) of the lower tray assembly (104). The upper closed end array of the flow guide sleeve (1042) is provided with a number of sieve holes (1045), and a fixed bubble cover (1046) is provided at the upper opening of the sieve hole (1045). The upper end of the fixed bubble cover (1046) is located above the tray plate (1041), and the tray plate (1041) is provided with a clearance hole for avoiding the fixed bubble cover (1046).

2. The multi-stage distillation apparatus for green methanol production according to claim 1, characterized in that, The outer circular surface of the distillation column (100) is provided with a feed ring pipe (103), and the outer circular surface of the feed ring pipe (103) is connected to a feed heat exchanger (101). A reboiler (102) is provided at the bottom of the distillation column (100). The outer wall of the distillation column (100) is provided with side holes, which are used to connect the flow guide zone of the tray assembly (104) located in the middle of the distillation column (100) with the feed ring pipe (103).

3. The multi-stage distillation apparatus for green methanol production according to claim 1, characterized in that, Multiple connection ports (1044) are arranged in an array along the circumferential direction of the guide sleeve (1042).

4. The multi-stage distillation apparatus for green methanol production according to claim 1, characterized in that, The upper open end of the fixed blister (1046) is fitted with a rotating cover (1047) via an inner bracket (1048). The rotating cover (1047) is coaxially located outside the fixed blister (1046). The lower closed end of the rotating cover (1047) is located above the fixed blister (1046). The height of the lower open end of the rotating cover (1047) is lower than the height of the upper end of the convex tube (1043).

5. The multi-stage distillation apparatus for green methanol production according to claim 4, characterized in that, The inner wall of the rotating cover (1047) is provided with propeller blades (1049). When gas flows into the rotating cover (1047) through the fixed bubble cover (1046), the rotating cover (1047) rotates under the cooperation of gas flow and propeller blades (1049).

6. The multi-stage distillation apparatus for green methanol production according to claim 5, characterized in that, The outer wall of the rotating cover (1047) is provided with multiple stirring blades (105) arranged in a circumferential direction.

7. A multi-stage distillation apparatus for green methanol production according to claim 5 or 6, characterized in that, The inlet of the pump (400) is connected to the storage tank (300) through an input pipe, and the outlet of the pump (400) is connected to the top of the distillation column (100) through an output pipe. The top of the distillation column (100) is connected to the condenser assembly (200) via an inlet pipe (202), and the condenser assembly (200) is connected to the liquid storage tank (300) via a connecting pipe.

8. The multi-stage distillation apparatus for green methanol production according to claim 1, characterized in that, The condensation assembly (200) includes a condenser (201) and an annular shell (206); The condenser (201) is provided with two annular baffles. The two annular baffles divide the annular inner cavity of the condenser (201) into three non-communicating annular regions in the radial direction. From the outside to the inside, they are the outer condensing ring region (2011), the middle condensing ring region (2012), and the inner condensing ring region (2013). Each of the three annular regions is equipped with several partition plates, and these partition plates work together to form a channel within the annular region that is used for fluid flow and is arranged in a continuous, curved manner. A connector is provided at the upper end of the annular region, and two connectors are arranged in an array along the circumference of the annular region. An inlet pipe (202) and an outlet pipe (203) are respectively installed at the two inlets of the central condensation ring zone (2012). The inlet pipe (202) is connected to the top of the distillation column (100). An inlet pipe (204) is provided between one nozzle of the outer condensing ring zone (2011) and one nozzle of the inner condensing ring zone (2013), and an outlet pipe (205) is provided between the other nozzle of the outer condensing ring zone (2011) and the other nozzle of the inner condensing ring zone (2013). The flow trajectory of the fluid in the channel of the outer condensing ring zone (2011) is opposite to that of the flow trajectory of the fluid in the channel of the inner condensing ring zone (2013). The upper surface of the ring shell (206) is provided with an annular fixing hole and the bottom of the condenser (201) is located inside the annular fixing hole; The bottom of the condenser (201) extends with a convex ring plate (210), the bottom of which is connected to the bottom of the ring shell (206). The bottom of the convex ring plate (210) is provided with a side opening (211), which penetrates the inner and outer walls of the convex ring plate (210). A connection hole (212) is provided at the bottom of the central condensing ring region (2012), and the connection hole (212) is located inside the convex ring plate (210); The upper surface of the annular shell (206) extends a convex edge (207), the interior of which is hollow and communicates with the inner cavity of the annular shell (206); A main drain valve (208) is provided at the bottom of the flange (207), and the main drain valve (208) is connected to the storage tank (300) through a connecting pipe.

9. A multi-stage distillation apparatus for green methanol production according to claim 8, characterized in that, A secondary drain valve (209) is provided at the bottom of the ring shell (206), and the end of the secondary drain valve (209) is connected to the connecting pipe.

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