A dimethyl ether production reactor of double helix structure

Abstract

This invention discloses a double-helix reactor for producing dimethyl ether, comprising a drying tube, a dimethyl ether synthesis tube, and a methanol synthesis tube. The drying tube and the dimethyl ether synthesis tube are synchronously spirally arranged to form a double-helix structure, with the drying tube positioned above the dimethyl ether synthesis tube. A double-tube contact area is provided at the spiral contact portion between the drying tube and the dimethyl ether synthesis tube. Within this double-tube contact area, the drying tube and the dimethyl ether synthesis tube are in fluid communication. The methanol synthesis gas outlet of the methanol synthesis tube is in fluid communication with the dimethyl ether synthesis reaction gas inlet of the dimethyl ether synthesis tube. This invention can solve the technical problem of easy moisture accumulation in existing dimethyl ether reactors, leading to decreased catalyst activity or even deactivation.

Description

Technical Field

[0001] This invention relates to the field of dimethyl ether preparation technology. Specifically, it relates to a double-helix structure reactor for the preparation of dimethyl ether. Background Technology

[0002] The synthesis of dimethyl ether from methanol is an exothermic reaction. During the reaction, it is crucial to remove the released heat promptly to ensure a stable and continuous synthesis process and minimize the formation of byproducts. Most existing reactors for synthesizing dimethyl ether from methanol dehydration utilize heat exchangers within a fixed bed to remove the heat released during the reaction. However, these reactors often suffer from the following drawback: the synthesis of dimethyl ether from methanol is a dehydration reaction. As the synthesis proceeds, water accumulation on the fixed bed can lead to decreased catalyst activity or even deactivation, resulting in reduced synthesis efficiency. Therefore, it is necessary to improve existing methanol-to-dimethyl ether reactors to reduce the impact of water accumulation on the dimethyl ether synthesis reaction. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide a double-helix structure dimethyl ether production reactor to solve the technical problem that water easily accumulates in existing dimethyl ether reactors, leading to a decrease in catalyst activity or even deactivation.

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0005] A double-helix reactor for producing dimethyl ether includes a drying tube, a dimethyl ether synthesis tube, and a methanol synthesis tube. The drying tube and the dimethyl ether synthesis tube are synchronously spirally arranged to form a double-helix structure, with the drying tube located above the dimethyl ether synthesis tube. A double-tube contact area is provided at the spiral contact portion between the drying tube and the dimethyl ether synthesis tube. Within the double-tube contact area, the drying tube and the dimethyl ether synthesis tube are in fluid communication. The methanol synthesis gas outlet of the methanol synthesis tube is in fluid communication with the dimethyl ether synthesis reaction gas inlet of the dimethyl ether synthesis tube.

[0006] The dimethyl ether synthesis tube is internally equipped with a dimethyl ether synthesis heat exchange tube. The body of the dimethyl ether synthesis heat exchange tube is spirally arranged inside the dimethyl ether synthesis tube, and both the fluid inlet and outlet ends of the dimethyl ether synthesis heat exchange tube extend beyond the tube wall of the dimethyl ether synthesis tube. A dimethyl ether synthesis catalyst is located in the space between the dimethyl ether synthesis tube and the dimethyl ether synthesis heat exchange tube within the dual-tube contact area. The drying tube is filled with a desiccant (the purpose of filling the drying tube is to selectively capture moisture in the reactor through physical or chemical adsorption, and then decompose and remove the water adsorbed by the desiccant by introducing inert gas into the drying tube, restoring the reactor). The desiccant's adsorption capacity is utilized to achieve regeneration and recycling. While purging with inert gas alone can remove some of the moisture generated in the reaction without filling with desiccant, it is inefficient, as the desorption dynamics of water molecules are limited and the process is time-consuming. Filling with desiccant without introducing inert gas still achieves good dehydration efficiency and a fast rate, with strong process stability, low energy consumption, wide applicability, and low maintenance costs; only periodic desiccant replacement is required. Compared to filling with desiccant alone or introducing inert gas alone, the coupling of desiccant and inert gas purging enables desorption, purging, and recycling, resulting in better dehydration. Furthermore, the desorption of moisture absorbed by the desiccant through inert gas purging significantly extends its lifespan. The desiccant in the drying tube will become saturated with water over time, therefore, it needs to be replaced periodically. The specific replacement method is: first, disconnect the connection at the double-tube contact area, then unscrew the drying tube in a spiral direction to replace the desiccant.

[0007] In the aforementioned double-helix structure dimethyl ether (DME) reactor, the DME synthesis catalyst fills the space between the DME synthesis tube and the DME synthesis heat exchange tube, forming at least six catalyst-dense zones. These catalyst-dense zones coincide with the double-tube contact area, meaning the number of double-tube contact areas is equal to the number of catalyst-dense zones. The purpose of forming these catalyst-dense zones within the DME synthesis tube through discontinuous filling of the catalyst is to create a highly active region, increasing the reaction driving force. These catalyst-dense zones are the contact portions of the double tubes. Methanol and other reactant gases in the DME synthesis tube undergo the DME synthesis reaction within these zones. The resulting water-containing gas and DME enter the drying tube through the double-tube contact area for drying. Meanwhile, the methanol and other reactant gases transported within the DME synthesis tube continue to replenish the catalyst-dense zones for the synthesis reaction, thereby improving the DME synthesis efficiency. If the DME synthesis catalyst is uniformly packed within the DME synthesis tube, moisture accumulation can lead to a rapid decrease in the overall catalyst bed activity or even deactivation.

[0008] In the aforementioned double-helix structure dimethyl ether reactor, the number of both the double-tube contact zone and the catalyst-dense zone is six. The double-tube contact zone includes a first contact zone, a second contact zone, a third contact zone, a fourth contact zone, a fifth contact zone, and a sixth contact zone. The first, second, third, fourth, fifth, and sixth contact zones are distributed at equal intervals along the helical direction of the dimethyl ether synthesis tube. The distance from the first contact zone to the dimethyl ether synthesis reaction gas inlet is 1 / 6 of the total length of the dimethyl ether synthesis tube, and the distance from the third contact zone to the dimethyl ether synthesis reaction gas outlet is 1 / 6 of the total length of the dimethyl ether synthesis tube. The first, second, third, fourth, fifth, and sixth contact zones are filled with catalyst, and the gas flow direction is from the dimethyl ether synthesis tube into the drying tube. In other parts of the spiral structure of the dimethyl ether reactor, the drying tube and the dimethyl ether synthesis tube are two independent pipes. The double-tube contact area is only opened in the catalyst-dense area. This is beneficial for the timely delivery of the aqueous dimethyl ether generated in the catalyst-dense area to the drying tube for drying, and avoids the accumulation of moisture in the catalyst-dense area, which would affect the catalytic activity and efficiency of the dimethyl ether synthesis catalyst.

[0009] In the above-mentioned double-helix structure dimethyl ether production reactor, both the wall of the drying tube and the wall of the dimethyl ether synthesis tube are provided with uniformly distributed dense small holes in the double tube contact area, and the dense small holes on the wall of the drying tube are one-to-one opposite to the dense small holes on the wall of the dimethyl ether synthesis tube.

[0010] In the aforementioned double-helix structure dimethyl ether production reactor, within the double-tube contact area, the drying tube and the dimethyl ether synthesis tube are fluidly connected via a flexible tube. Specifically, the first end of the flexible tube is installed on the wall of the drying tube, and the second end is installed on the wall of the dimethyl ether synthesis tube. The first end of the flexible tube is fluidly connected to the drying tube, and the second end of the flexible tube is fluidly connected to the dimethyl ether synthesis tube. The flexible tubes are evenly distributed within the double-tube contact area.

[0011] The above-mentioned double-helix structure dimethyl ether reactor also includes a dimethyl ether synthesis gas distributor in the space between the dimethyl ether synthesis tube and the dimethyl ether synthesis heat exchange tube. The number of dimethyl ether synthesis gas distributors is equal to the number of the double-tube contact areas, and the dimethyl ether synthesis gas distributors are evenly distributed along the spiral direction of the dimethyl ether synthesis tube.

[0012] In the above-mentioned double-helix structure dimethyl ether production reactor, the dimethyl ether synthesis gas distributor is a gas distribution plate, and the gas distribution plate is located upstream of the double-tube contact area. The drying tube is made of glass material.

[0013] In the above-mentioned double-helix structure dimethyl ether production reactor, the inner diameter of the drying tube and the dimethyl ether synthesis tube are equal, which can ensure uniform gas flow distribution and improve mass transfer efficiency; the ratio of the width of the double tube contact area to the inner diameter of the dimethyl ether synthesis tube is 1:1.2 to 1.5, which can ensure that the pressure drop of the gas flow in the double tube contact area is moderate and avoid gas stagnation.

[0014] In the above-mentioned double-helix structure dimethyl ether production reactor, the ratio of the outer diameter of the dimethyl ether synthesis heat exchange tube to the inner diameter of the dimethyl ether synthesis tube is 1:5 to 8; the ratio of the length of the dimethyl ether synthesis heat exchange tube located inside the dimethyl ether synthesis tube to the length of the dimethyl ether synthesis tube is 1:1.5 to 2; this ensures that the heat generated during the dimethyl ether reaction can be efficiently transferred to the outside of the dimethyl ether production reactor.

[0015] In the aforementioned double-helix structure dimethyl ether reactor, the methanol synthesis tube is internally equipped with a first methanol synthesis gas distributor, a second methanol synthesis gas distributor, a methanol synthesis heat exchange tube, and a methanol synthesis catalyst. The first methanol synthesis gas distributor is located adjacent to the feed gas inlet of the methanol synthesis tube, and the second methanol synthesis gas distributor is located adjacent to the methanol synthesis gas outlet of the methanol synthesis tube. The fluid inlet and fluid outlet ends of the methanol synthesis heat exchange tube extend outside the methanol synthesis tube through the tube wall. The methanol synthesis catalyst fills the space between the methanol synthesis tube and the methanol synthesis heat exchange tube. Both the first and second methanol synthesis gas distributors are gas distribution plates.

[0016] In the aforementioned double-helix structure dimethyl ether reactor, during the synthesis of methanol and dimethyl ether, the temperature of the reaction beds in the methanol synthesis tube and dimethyl ether synthesis tube is raised to the required reaction temperature using electric heating. Electric heating is achieved using common electric heating equipment. Alternatively, other heating methods such as combustion heating, hot oil circulation heating, Joule heating, steam heating, and gas circulation heating can also be used to heat the reaction beds.

[0017] The technical solution of this utility model has achieved the following beneficial technical effects:

[0018] The double-helix structure dimethyl ether production reactor of this invention consists of a fixed-bed reactor for methanol synthesis (i.e., the methanol synthesis tube) and two helical tubes, namely the dimethyl ether synthesis tube and the gas drying tube. The dimethyl ether synthesis tube contains several catalyst-dense zones, which can improve the efficiency of the dimethyl ether synthesis reaction. An inert gas and / or a desiccant are continuously introduced into the drying tube to absorb moisture in the dimethyl ether synthesis reaction gas, achieving the effect of drying the dimethyl ether synthesis reaction gas. The contact portion (i.e., the double-tube contact area) between the dimethyl ether synthesis tube and the gas drying tube is connected to allow gas flow; the drying tube uses a glass material with better heat exchange performance. This double-helix structure dimethyl ether production reactor has the following advantages:

[0019] (1) By setting several catalyst-dense zones in the dimethyl ether synthesis tube, the reaction efficiency of the dimethyl ether synthesis reaction can be effectively improved; (2) The layered drying structure of blowing inert gas and filling desiccant in the drying tube can effectively avoid the problems of catalyst deactivation and reduced reaction efficiency caused by water accumulation in the traditional dimethyl ether synthesis process, and promote the reaction to proceed better in the forward direction, thereby improving the reaction efficiency. Attached Figure Description

[0020] Figure 1 A schematic diagram of the double-helix structure of the dimethyl ether production reactor in this embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the dimethyl ether synthesis tube of the dimethyl ether preparation reactor in this embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the drying tube of the dimethyl ether production reactor in this embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of the double-tube contact area of ​​the dimethyl ether reactor in this embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the internal structure of the methanol synthesis tube in the dimethyl ether production reactor of this utility model embodiment;

[0025] Figure 6 A schematic diagram of the internal structure of the dimethyl ether synthesis tube in the dimethyl ether reactor of this utility model embodiment;

[0026] Figure 7 A schematic diagram of the internal structure of the drying tube of the dimethyl ether production reactor in this embodiment of the present invention;

[0027] Figure 8 A schematic diagram of the distribution of the catalyst-dense region inside the methanol synthesis tube in this embodiment of the present invention;

[0028] Figure 9A schematic diagram of the pipe wall structure of the double-pipe contact area in this embodiment of the present invention;

[0029] Figure 10 A schematic diagram (oblique view) of another dimethyl ether production reactor structure with a dual-tube contact area in this embodiment of the present invention;

[0030] Figure 11 A schematic diagram (front view) of another dimethyl ether production reactor with a dual-tube contact area in this embodiment of the present invention;

[0031] Figure 12 A schematic diagram of the hose installation of another dual-tube contact zone dimethyl ether production reactor in this embodiment of the present invention.

[0032] The reference numerals in the diagram are as follows: 1-Drying tube; 11-Nitrogen inlet; 12-Desiccant; 13-Nitrogen outlet; 2-Dimethyl ether synthesis tube; 21-Dimethyl ether synthesis gas distributor; 22-Dimethyl ether synthesis heat exchange tube; 23-Dimethyl ether synthesis reaction gas outlet; 24-Dimethyl ether synthesis catalyst; 3-Methanol synthesis tube; 31-First methanol synthesis gas distributor; 32-Second methanol synthesis gas distributor; 33-Methanol synthesis heat exchange tube; 34-Methanol synthesis catalyst; 35-Feed gas inlet; 4-Dual tube contact zone; 41-First contact zone; 42-Second contact zone; 43-Third contact zone; 44-Fourth contact zone; 45-Fifth contact zone; 46-Sixth contact zone; 47-Hose; 5-Catalyst dense zone. Detailed Implementation

[0033] like Figures 1 to 3 As shown, the dimethyl ether (DME) reactor with a double-helix structure in this embodiment includes a drying tube 1, a dimethyl ether synthesis tube 2, and a methanol synthesis tube 3. The drying tube 1 and the dimethyl ether synthesis tube 2 are synchronously spirally arranged to form a double-helix structure, with the drying tube 1 located above the dimethyl ether synthesis tube 2. A double-tube contact area 4 is provided at the spiral contact portion of the drying tube 1 and the dimethyl ether synthesis tube 2, and the drying tube 1 is fluidly connected to the dimethyl ether synthesis tube 2 through the double-tube contact area 4. The methanol synthesis gas outlet of the methanol synthesis tube 3 is fluidly connected to the dimethyl ether synthesis reaction gas inlet of the dimethyl ether synthesis tube 2. The inner diameters of the drying tube 1 and the dimethyl ether synthesis tube 2 are equal. The dimethyl ether synthesis catalyst 24 fills the space between the dimethyl ether synthesis tube 2 and the dimethyl ether synthesis heat exchange tube 22 to form 6 catalyst-dense zones 5. The catalyst-dense zones 5 coincide with the double-tube contact areas 4, that is, the number of double-tube contact areas 4 and the number of catalyst-dense zones 5 are equal, both being 6.

[0034] like Figure 4 and Figure 8As shown, the dual-tube contact area 4 includes a first contact area 41, a second contact area 42, a third contact area 43, a fourth contact area 44, a fifth contact area 45, and a sixth contact area 46. The first contact area 41, the second contact area 42, the third contact area 43, the fourth contact area 44, the fifth contact area 45, and the sixth contact area 46 are distributed at equal intervals along the spiral direction of the dimethyl ether synthesis tube 2, and the distance from the first contact area 41 to the dimethyl ether synthesis reaction gas inlet is the total distance of the dimethyl ether synthesis tube 2. The distance from the third contact zone 43 to the dimethyl ether synthesis reaction gas outlet 23 is 1 / 6 of the total length of the dimethyl ether synthesis tube 2; the first contact zone 41, the second contact zone 42, the third contact zone 43, the fourth contact zone 44, the fifth contact zone 45 and the sixth contact zone 46 are filled with catalyst, and the gas flow direction is from the dimethyl ether synthesis tube 2 to the drying tube 1; the ratio of the width of the double tube contact zone 4 to the inner diameter of the dimethyl ether synthesis tube 2 is 1:1.5.

[0035] In this embodiment, within the dual-tube contact area 4, both the walls of the drying tube 1 and the dimethyl ether synthesis tube 2 are provided with densely packed small holes, and the densely packed small holes on the wall of the drying tube 1 are aligned one-to-one with the densely packed small holes on the wall of the dimethyl ether synthesis tube 2. The specific connection method involves cutting off the connecting portion of the drying tube and the dimethyl ether synthesis tube, and replacing it with two iron plates with densely packed small holes (see schematic diagram of the iron plates). Figure 9 (Only a small section is shown). When using, simply align these small holes. The desiccant inside the drying tube will become saturated with water over time, so it is necessary to replace the desiccant that has accumulated due to saturation in the drying tube regularly. You can screw the drying tube upwards to replace the desiccant regularly.

[0036] In other embodiments, within the dual-tube contact area 4, the drying tube 1 and the dimethyl ether synthesis tube 2 are fluidly connected via a flexible hose 47. Specifically, the first end of the flexible hose 47 is mounted on the wall of the drying tube 1, and the second end is mounted on the wall of the dimethyl ether synthesis tube 2. The first end of the flexible hose 47 is fluidly connected to the drying tube 1, and the second end of the flexible hose 47 is fluidly connected to the dimethyl ether synthesis tube 2. The flexible hoses 47 are evenly distributed within the dual-tube contact area 4 (see...). Figure 10 -to Figure 12 The specific connection method is as follows: both ends of the hose 47 are threaded and can be screwed in respectively; nuts are installed on the tube walls at both ends (other connection methods can also be used); the desiccant in the drying tube will become saturated with water over time, so it is necessary to replace the desiccant that has accumulated in the drying tube due to saturation regularly. You can first remove the connection part, and then screw the drying tube upwards to replace the desiccant regularly.

[0037] like Figure 5 As shown, a first methanol synthesis gas distributor 31, a second methanol synthesis gas distributor 32, a methanol synthesis heat exchange tube 33, and a methanol synthesis catalyst 34 are disposed in the space between the methanol synthesis tube 3 and the methanol synthesis heat exchange tube 33. The first methanol synthesis gas distributor 31 is disposed adjacent to the feed gas inlet 35 of the methanol synthesis tube 3, and the second methanol synthesis gas distributor 32 is disposed adjacent to the methanol synthesis gas outlet of the methanol synthesis tube 3. The fluid inlet end and the fluid outlet end of the methanol synthesis heat exchange tube 33 both extend out of the outside of the methanol synthesis tube 3 through the tube wall. The methanol synthesis catalyst 34 fills the inside of the methanol synthesis tube 3. The first methanol synthesis gas distributor 31 and the second methanol synthesis gas distributor 32 are both gas distribution plates.

[0038] like Figure 6 As shown, a dimethyl ether synthesis heat exchange tube 22 is disposed inside the dimethyl ether synthesis tube 2. The body of the dimethyl ether synthesis heat exchange tube 22 is spirally arranged inside the dimethyl ether synthesis tube 2, and the fluid inlet end and fluid outlet end of the dimethyl ether synthesis heat exchange tube 22 both pass through the tube wall of the dimethyl ether synthesis tube 2 and extend outside the dimethyl ether synthesis tube 2. The ratio of the outer diameter of the dimethyl ether synthesis heat exchange tube 22 to the inner diameter of the dimethyl ether synthesis tube 2 is 1:8. The ratio of the length of the dimethyl ether synthesis heat exchange tube 22 located inside the dimethyl ether synthesis tube 2 to the length of the dimethyl ether synthesis tube 2 is 1:1.5. A dimethyl ether synthesis gas distributor 21 is also disposed in the space between the dimethyl ether synthesis tube 2 and the dimethyl ether synthesis heat exchange tube 22. There are 6 dimethyl ether synthesis gas distributors 21, which are evenly distributed along the spiral direction of the dimethyl ether synthesis tube 2. The dimethyl ether synthesis gas distributor 21 is a gas distribution plate, and the gas distribution plate is located upstream of the catalyst-dense zone 5.

[0039] like Figure 7 As shown, the drying tube 1 is filled with desiccant 12, and the drying tube 1 is made of glass material with good heat exchange performance. Furthermore, during the synthesis of methanol and dimethyl ether, electric heating is used to raise the temperature of the reaction beds in the methanol synthesis tube and dimethyl ether synthesis tube to the required reaction temperature; the electric heating is achieved using common electric heating equipment. In other embodiments, other heating methods such as combustion heating, hot oil circulation heating, Joule heating, steam heating, and gas circulation heating can also be used to heat the reaction beds.

[0040] The workflow of the double-helix structure dimethyl ether production reactor in this embodiment is as follows:

[0041] CO2 and H2 are introduced into the methanol synthesis pipe 3 through the raw material gas inlet 35. After being evenly diffused by the first methanol synthesis gas distributor 31, they react under the conditions of the methanol synthesis catalyst 34 and a suitable reaction temperature, producing CH3OH and water vapor. The generated CH3OH, water vapor, and some unreacted gases are then evenly diffused again through the second methanol synthesis gas distributor 32 before entering the dimethyl ether synthesis pipe 2. Under the suitable temperature and the action of the dimethyl ether synthesis catalyst 24, dimethyl ether gas, water vapor, and unreacted gases are generated. These gases pass through the connection part of the two spiral tubes (the first part of the double tube contact area). The first contact zone (41) enters the drying tube 1 and comes into contact with the desiccant 12 filled in the drying tube 1 to remove moisture. The dehydrated dimethyl ether gas rises along the drying tube 1, while some unreacted gas (methanol) continues spiraling upwards along the dimethyl ether synthesis tube. After entering the catalyst-dense zone 5 filled in the dimethyl ether synthesis tube, it continues to react under the action of the catalyst to produce dimethyl ether. These gases go through the same steps through the second contact zone 2 and the third contact zone 3 into the drying tube 1 for drying. At the same time, nitrogen gas is introduced through the nitrogen inlet 11 of the drying tube 1 so that the moisture absorbed by the desiccant 12 is desorbed and blown out. In this way, the dimethyl ether synthesis reaction and the drying of the dimethyl ether synthesis reaction gas are circulated layer by layer through the double helix structure, which can effectively remove a large amount of moisture generated by the dimethyl ether synthesis reaction gas and promote the forward progress of the dimethyl ether synthesis reaction. Finally, the gas from the dimethyl ether synthesis reaction is discharged from the dimethyl ether synthesis reaction gas outlet 23, while the water produced by the dimethyl ether synthesis reaction is blown out from the nitrogen outlet 13 of the drying tube 1 by the inert gas N2.

[0042] During this process, the methanol synthesis tube 3 absorbs the heat released during methanol synthesis by introducing a heat exchange medium into the methanol synthesis heat pipe, thereby ensuring the stable progress of the methanol synthesis reaction in the methanol synthesis tube; at the same time, the dimethyl ether synthesis tube 2 absorbs the heat released during dimethyl ether synthesis by introducing a heat exchange medium into the dimethyl ether synthesis heat exchange pipe, thereby ensuring the stable progress of the dimethyl ether synthesis reaction in the dimethyl ether synthesis tube.

[0043] The reaction equation in the double-helix reactor for the production of dimethyl ether in this embodiment is as follows:

[0044]

[0045] CO2 + 3H2 = CH3OH + H2O;

[0046]

[0047] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A double-helix reactor for producing dimethyl ether, characterized in that, It includes a drying tube (1), a dimethyl ether synthesis tube (2), and a methanol synthesis tube (3); the drying tube (1) and the dimethyl ether synthesis tube (2) are synchronously spirally arranged to form a double helix structure, and the drying tube (1) is located above the dimethyl ether synthesis tube (2). The spiral contact portion of the drying tube (1) and the dimethyl ether synthesis tube (2) is provided with a double tube contact area (4); within the double tube contact area (4), the drying tube (1) and the dimethyl ether synthesis tube (2) are fluidly connected; the methanol synthesis gas outlet of the methanol synthesis tube (3) is fluidly connected to the dimethyl ether synthesis reaction gas inlet of the dimethyl ether synthesis tube (2); The dimethyl ether synthesis tube (2) is provided with a dimethyl ether synthesis heat exchange tube (22) inside. The body of the dimethyl ether synthesis heat exchange tube (22) is spirally arranged inside the dimethyl ether synthesis tube (2) and synchronously with the dimethyl ether synthesis tube (2). The fluid inlet end and the fluid outlet end of the dimethyl ether synthesis heat exchange tube (22) both pass through the tube wall of the dimethyl ether synthesis tube (2) and extend outside the dimethyl ether synthesis tube (2). In the double tube contact area (4), there is a dimethyl ether synthesis catalyst (24) in the space between the dimethyl ether synthesis tube (2) and the dimethyl ether synthesis heat exchange tube (22). The drying tube (1) is filled with a desiccant (12).

2. The dimethyl ether production reactor with a double helix structure according to claim 1, characterized in that, The dimethyl ether synthesis catalyst (24) fills the space between the dimethyl ether synthesis tube (2) and the dimethyl ether synthesis heat exchange tube (22) to form at least 6 catalyst dense zones (5); the catalyst dense zones coincide with the double tube contact zone (4), that is, the number of the double tube contact zone (4) is equal to the number of the catalyst dense zones (5).

3. The dimethyl ether production reactor with a double helix structure according to claim 2, characterized in that, The number of the dual-tube contact area (4) and the catalyst-dense area (5) are both 6; the dual-tube contact area (4) includes a first contact area (41), a second contact area (42), a third contact area (43), a fourth contact area (44), a fifth contact area (45), and a sixth contact area (46); the first contact area (41), the second contact area (42), the third contact area (43), the fourth contact area (44), the fifth contact area (45), and the sixth contact area (46) are distributed at equal intervals along the spiral direction of the dimethyl ether synthesis tube (2), and the first contact area... The distance from zone (41) to the gas inlet of the dimethyl ether synthesis reaction is 1 / 6 of the total length of the dimethyl ether synthesis tube (2), and the distance from the third contact zone (43) to the gas outlet (23) of the dimethyl ether synthesis reaction is 1 / 6 of the total length of the dimethyl ether synthesis tube (2); the first contact zone (41), the second contact zone (42), the third contact zone (43), the fourth contact zone (44), the fifth contact zone (45) and the sixth contact zone (46) are filled with catalyst, and the gas flow direction is from the dimethyl ether synthesis tube (2) to the drying tube (1).

4. The dimethyl ether production reactor with a double helix structure according to claim 3, characterized in that, Within the dual-tube contact area (4), both the wall of the drying tube (1) and the wall of the dimethyl ether synthesis tube (2) are provided with densely distributed small holes, and the densely distributed small holes on the wall of the drying tube (1) are opposite to the densely distributed small holes on the wall of the dimethyl ether synthesis tube (2).

5. The dimethyl ether production reactor with a double helix structure according to claim 3, characterized in that, Within the dual-tube contact area (4), the drying tube (1) and the dimethyl ether synthesis tube (2) are connected by a flexible tube. Specifically, the first end of the flexible tube is installed on the wall of the drying tube (1), and the second end is installed on the wall of the dimethyl ether synthesis tube (2). The first end of the flexible tube is connected to the drying tube (1), and the second end of the flexible tube is connected to the dimethyl ether synthesis tube (2). The flexible tubes are evenly distributed within the dual-tube contact area (4).

6. The dimethyl ether production reactor with a double helix structure according to claim 1, characterized in that, A dimethyl ether synthesis gas distributor (21) is also provided in the space between the dimethyl ether synthesis tube (2) and the dimethyl ether synthesis heat exchange tube (22). The number of dimethyl ether synthesis gas distributors (21) is equal to the number of the double tube contact area (4). The dimethyl ether synthesis gas distributors (21) are evenly distributed along the spiral direction of the dimethyl ether synthesis tube (2).

7. The dimethyl ether production reactor with a double helix structure according to claim 6, characterized in that, The dimethyl ether synthesis gas distributor (21) is a gas distribution plate, and the gas distribution plate is located upstream of the double tube contact area (4); the drying tube (1) is made of glass material.

8. The dimethyl ether production reactor with a double helix structure according to claim 1, characterized in that, The inner diameter of the drying tube (1) is equal to that of the dimethyl ether synthesis tube (2); the width of the double tube contact area (4) is in the ratio of 1:1.2 to 1.5 to the inner diameter of the dimethyl ether synthesis tube (2).

9. The dimethyl ether production reactor with a double helix structure according to claim 1, characterized in that, The ratio of the outer diameter of the dimethyl ether synthesis heat exchange tube (22) to the inner diameter of the dimethyl ether synthesis tube (2) is 1:5 to 8; the ratio of the length of the dimethyl ether synthesis heat exchange tube (22) located inside the dimethyl ether synthesis tube (2) to the length of the dimethyl ether synthesis tube (2) is 1:1.5 to 2.

10. The dimethyl ether production reactor with a double helix structure according to any one of claims 1-9, characterized in that, The methanol synthesis pipe (3) is internally provided with a first methanol synthesis gas distributor (31), a second methanol synthesis gas distributor (32), a methanol synthesis heat exchange pipe (33), and a methanol synthesis catalyst (34); the first methanol synthesis gas distributor (31) is located adjacent to the raw material gas inlet (35) of the methanol synthesis pipe (3), and the second methanol synthesis gas distributor (32) is located adjacent to the methanol synthesis gas outlet of the methanol synthesis pipe (3); the fluid inlet end and the fluid outlet end of the methanol synthesis heat exchange pipe (33) both extend out of the outside of the methanol synthesis pipe (3) through the pipe wall; the methanol synthesis catalyst (34) fills the space between the methanol synthesis pipe (3) and the methanol synthesis heat exchange pipe (33); the first methanol synthesis gas distributor (31) and the second methanol synthesis gas distributor (32) are both gas distribution plates.

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