Hydrogen recovery device for methanol synthesis device

Abstract

The utility model provides a hydrogen recovery device for a methanol synthesis device, which relates to the field of synthesis device membrane separation hydrogen recovery equipment and comprises a hydrogen separation component which comprises a shell, an end cover, a top cover, a membrane core, a first communicating pipe, a communicating valve, a second communicating pipe and a third communicating pipe. The number of the hydrogen separation assemblies is three, each hydrogen separation assembly comprises two hydrogen separation assemblies, and the hydrogen separation assemblies are connected with the purge gas conveying pipeline through first communicating pipes. According to the utility model, the hydrogen separation component is additionally arranged, so that the transformation of the membrane separation unit and the parallel operation of the original membrane separator are realized to adapt to different actual operation condition requirements of the initial stage and the final stage of a catalyst, and further the effective gas recovery rate is improved; by additionally arranging the hydrogen separation assembly, the situation that impermeable gas is directly emptied to a torch under the high-load working condition and the catalyst last-stage working condition can be reduced, the hydrogen separation assembly can be used in parallel with an existing membrane module, adjustment is conducted according to load changes, and therefore loss is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of membrane separation hydrogen recovery equipment for synthesis devices, in particular to a hydrogen recovery device for a methanol synthesis device. Background Art

[0002] A methanol synthesis unit is an industrial device used to convert carbon monoxide and hydrogen into methanol. Methanol is an important chemical raw material used in the production of various chemicals, fuels, and solvents. In a methanol synthesis unit, a membrane separation unit is a technology used to separate and purify gas mixtures. Membrane separation technology uses specific membrane materials to separate mixed gases into different components through selective permeation. Membrane separation units are typically used in methanol synthesis units to improve the utilization efficiency of reaction gases, optimize reaction conditions, and recover and treat by-products.

[0003] The membrane separation unit can recover unreacted hydrogen so that the gas can be fed back into the reactor, thereby improving the utilization rate of raw materials and reducing production costs. However, at higher loads and when the methanol synthesis catalyst is at the end of its service life, the amount of purge gas entering the membrane separation unit gradually increases, causing the hydrogen recovery rate to be lower than the design value. This is mainly because in order to meet the higher load operation, the non-permeate gas from the membrane separation part is directly discharged into the flare, resulting in an increase in material consumption.

[0004] In summary, the present invention provides a hydrogen recovery device for a methanol synthesis device to solve the above problems. Utility Model Content

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A hydrogen recovery device for a methanol synthesis device includes a hydrogen separation component, which includes an outer shell, an end cover, a top cover, a membrane core, a first connecting pipe, a connecting valve, a second connecting pipe, and a third connecting pipe. The number of hydrogen separation components is set to three groups, and each group has two components. The hydrogen separation component is connected to a purge gas transmission pipeline through the first connecting pipe, the hydrogen separation component is connected to a permeate gas pipeline through the third connecting pipe, and the hydrogen separation component is connected to a hydrogen recovery pipeline through the second connecting pipe. A connecting component is provided on the surface of the hydrogen separation component, and the connecting component is used to fix the outer shell to the end cover and the top cover.

[0007] Furthermore, in the present invention, the end cover is located at the top of the shell, the top cover is located at the bottom of the shell, and the membrane core is located in the inner cavity of the shell and is movably connected to the inner cavity of the shell.

[0008] Furthermore, in the present invention, the connecting valve is installed on the surface of the first connecting pipe, one end of the first connecting pipe is connected to the air inlet end of the shell, and the other end of the first connecting pipe is connected to the release gas supply pipe.

[0009] Furthermore, in the present invention, one end of the second communicating tube is communicated with the gas outlet end of the shell, and the other end of the second communicating tube is communicated with the hydrogen recovery pipe.

[0010] Furthermore, in the present invention, one end of the third communicating tube and the fourth communicating tube are both connected to the permeate gas pipe, and the other ends of the third communicating tube and the fourth communicating tube are respectively connected to the end cover and the gas outlet end of the third communicating tube.

[0011] Furthermore, in the present invention, the connecting assembly includes a first clamp, a second clamp, a bolt and a nut, and the upper and lower ends of the shell surface are provided with connecting assemblies, and one end of the bolt passes through the first clamp and the second clamp and is threadedly connected to the nut.

[0012] Beneficial effects: The utility model has the following beneficial effects:

[0013] The utility model realizes the transformation of the membrane separation unit and the parallel operation of the original membrane separator by adding a hydrogen separation component, so as to adapt to the different actual operating conditions of the initial and final stages of the catalyst, thereby improving the effective gas recovery rate. By adding the hydrogen separation component, not only can the situation of non-permeate gas being directly discharged to the flare under higher load conditions and the final stage of the catalyst be reduced, but it can also be used in parallel with the existing membrane group and adjusted according to load changes, thereby reducing losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the hydrogen recovery process of the utility model;

[0015] Figure 2 This is a schematic diagram of the main structure of the hydrogen separation component of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the separation state of the hydrogen separation component and the connection component of the utility model.

[0017] In the picture:

[0018] 1. Hydrogen separation assembly; 101. Housing; 102. End cover; 103. Top cover; 104. Membrane core; 105. First connecting pipe; 106. Connecting valve; 107. Second connecting pipe; 108. Third connecting pipe; 109. Fourth connecting pipe; 2. Connecting assembly; 201. First clamp; 202. Second clamp; 203. Bolt; 204. Nut. DETAILED DESCRIPTION

[0019] In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings. Various aspects of the present invention are described in this disclosure with reference to the accompanying drawings, in which many illustrative embodiments are shown. The embodiments of the present disclosure are not necessarily defined to include all aspects of the present invention. It should be understood that the various concepts and embodiments introduced above, as well as those described in more detail below, can be implemented in any of many ways, because the concepts and embodiments disclosed in the present invention are not limited to any implementation method. In addition, some aspects disclosed in the present invention can be used alone or in any appropriate combination with other aspects disclosed in the present invention.

[0020] Example 1

[0021] like Figure 1-3 As shown, it is the first embodiment of the present invention, which provides a hydrogen recovery device for a methanol synthesis device, including a hydrogen separation component 1. The hydrogen separation component 1 includes a shell 101, an end cover 102, a top cover 103, a membrane core 104, a first connecting pipe 105, a connecting valve 106, a second connecting pipe 107 and a third connecting pipe 108. The number of hydrogen separation components 1 is set to three groups, and each group has two branches. The hydrogen separation component 1 is connected to the purge gas transmission pipeline through the first connecting pipe 105, the hydrogen separation component 1 is connected to the permeate gas pipeline through the third connecting pipe 108, and the hydrogen separation component 1 is connected to the hydrogen recovery pipeline through the second connecting pipe 107. A connecting component 2 is provided on the surface of the hydrogen separation component 1, and the connecting component 2 is used to fix the shell 101 to the end cover 102 and the top cover 103.

[0022] like Figure 1-3 As shown, the membrane core 104 can be made of ceramic membrane, and the purge gas enters the inner cavity of the shell 101 through the first connecting pipe 105 and the connecting valve 106, and is separated by the membrane core 104. The permeate gas is transported to the permeate gas pipeline through the third connecting pipe 108 and the fourth connecting pipe 109, and the high pressure in the purge gas pipeline is transported to the high-pressure torch for combustion through the high-pressure pipe, and the low pressure in the hydrogen recovery pipe is transported to the low-pressure torch for combustion. The separated hydrogen is transported to the recovery pipeline through the second connecting pipe 107, and is transported again to the synthesis unit for reaction use through the recovery pipeline. By adding three groups of hydrogen separation components 1, the transformation of the membrane separation unit and the parallel operation of the original membrane separator are realized to adapt to the different actual operating conditions of the catalyst in the initial and final stages, thereby improving the effective gas recovery rate. Each group is set to two, which can achieve the effect of one use and one standby. By adding the hydrogen separation component 1, not only can the situation of non-permeate gas being directly discharged to the torch under higher load conditions and catalyst late stage conditions be reduced.

[0023] Example 2

[0024] Reference Figure 1-3 , which is the second embodiment of the present utility model, and this embodiment is based on the previous embodiment.

[0025] In this embodiment, the end cover 102 is located at the top of the shell 101 , the top cover 103 is located at the bottom of the shell 101 , and the membrane core 104 is located in the inner cavity of the shell 101 and is movably connected to the inner cavity of the shell 101 .

[0026] The connecting valve 106 is installed on the surface of the first connecting pipe 105. One end of the first connecting pipe 105 is connected to the air inlet end of the shell 101, and the other end of the first connecting pipe 105 is connected to the purge gas supply pipe.

[0027] One end of the second connecting pipe 107 is connected to the gas outlet end of the housing 101 , and the other end of the second connecting pipe 107 is connected to the hydrogen recovery pipe.

[0028] One end of the third connecting pipe 108 and the fourth connecting pipe 109 are both connected to the permeate gas pipe, and the other ends of the third connecting pipe 108 and the fourth connecting pipe 109 are respectively connected to the end cover 102 and the gas outlet end of the third connecting pipe 108.

[0029] The connecting assembly 2 includes a first clamp 201, a second clamp 202, a bolt 203 and a nut 204. The connecting assembly 2 is provided at the upper and lower ends of the surface of the shell 101. One end of the bolt 203 passes through the first clamp 201 and the second clamp 202 and is threadedly connected to the nut 204.

[0030] like Figure 1-3 As shown, the end cover 102 and the top cover 103 are respectively mounted on the upper and lower ends of the outer shell 101, and the end cover 102 and the top cover 103 are fixed to the outer shell 101 by engaging with the first clamp 201 and the second clamp 202. Then, the bolt 203 passes through the first clamp 201 and the second clamp 202 and is fixed by the nut 204, so that the outer shell 101, the end cover 102 and the top cover 103 can be fixed.

[0031] When in use, the end cover 102 and the top cover 103 are respectively sleeved on the upper end and the lower end of the shell 101, and the end cover 102 and the top cover 103 are fixed to the shell 101 through the first clamp 201 and the second clamp 202. Then the bolt 203 passes through the first clamp 201 and the second clamp 202 and is fixed by the nut 204, so that the shell 101 and the end cover 102 and the top cover 103 can be fixed. The membrane core 104 can adopt a ceramic membrane. The relief gas enters the inner cavity of the shell 101 through the first connecting pipe 105 and the connecting valve 106, and is separated by the membrane core 104. The permeate gas is transported to the permeate gas pipeline through the third connecting pipe 108 and the fourth connecting pipe 109. The high pressure in the gas pipeline is transported to the high-pressure flare for combustion through the high-pressure pipe, and the low pressure in the hydrogen recovery pipe is transported to the low-pressure flare for combustion. The separated hydrogen is transported to the recovery pipeline through the second connecting pipe 107, and is transported again to the synthesis device for reaction through the recovery pipeline. By adding three groups of hydrogen separation components 1, the transformation of the membrane separation unit and the parallel operation of the original membrane separator are realized to adapt to the different actual operating conditions of the catalyst in the initial and final stages, thereby improving the effective gas recovery rate. Each group is set to two, which can achieve the effect of one use and one backup. By adding the hydrogen separation component 1, not only can the situation of non-permeate gas being directly discharged to the flare under higher load conditions and catalyst late-stage conditions be reduced.

[0032] The standard parts used in this application document can all be purchased from the market, and can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. The control method is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by technicians in this field, which is common knowledge in this field. In addition, this application is mainly used to protect mechanical devices, so this application no longer explains the control method and circuit connection in detail.

[0033] While the present invention has been described above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations may be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A hydrogen recovery device for a methanol synthesis device, comprising a hydrogen separation component (1), characterized in that: The hydrogen separation component (1) comprises a shell (101), an end cover (102), a top cover (103), a membrane core (104), a first connecting pipe (105), a connecting valve (106), a second connecting pipe (107) and a third connecting pipe (108). The number of the hydrogen separation components (1) is set to three groups, and each group has two components. The hydrogen separation component (1) is connected to the purge gas transmission pipeline through the first connecting pipe (105), the hydrogen separation component (1) is connected to the permeate gas pipeline through the third connecting pipe (108), and the hydrogen separation component (1) is connected to the hydrogen recovery pipeline through the second connecting pipe (107). A connecting component (2) is provided on the surface of the hydrogen separation component (1), and the connecting component (2) is used to fix the shell (101) to the end cover (102) and the top cover (103).

2. A hydrogen recovery device for a methanol synthesis device as claimed in claim 1, characterized in that: The end cover (102) is located at the top of the shell (101), the top cover (103) is located at the bottom of the shell (101), and the membrane core (104) is located in the inner cavity of the shell (101) and is movably connected to the inner cavity of the shell (101).

3. The hydrogen recovery device for a methanol synthesis device according to claim 1, characterized in that: The communication valve (106) is installed on the surface of the first communication pipe (105), one end of the first communication pipe (105) is connected to the air inlet end of the housing (101), and the other end of the first communication pipe (105) is connected to the release gas pipeline.

4. The hydrogen recovery device for a methanol synthesis device according to claim 1, characterized in that: One end of the second communicating tube (107) is communicated with the gas outlet end of the housing (101), and the other end of the second communicating tube (107) is communicated with the hydrogen recovery pipe.

5. The hydrogen recovery device for a methanol synthesis device according to claim 1, characterized in that: One end of the third communicating tube (108) and the fourth communicating tube (109) are both connected to the permeate gas pipe, and the other ends of the third communicating tube (108) and the fourth communicating tube (109) are respectively connected to the end cover (102) and the gas outlet end of the third communicating tube (108).

6. The hydrogen recovery device for a methanol synthesis device according to claim 1, characterized in that: The connecting assembly (2) comprises a first clamp (201), a second clamp (202), a bolt (203) and a nut (204); the connecting assembly (2) is provided at both the upper end and the lower end of the surface of the housing (101); one end of the bolt (203) passes through the first clamp (201) and the second clamp (202) and is threadedly connected to the nut (204).

Images