Methanol yield optimization purge gas recycling device

Abstract

The utility model discloses a methanol yield optimization purge gas cyclic utilization device which comprises a circulation assembly, and the circulation assembly comprises a water washing tower, a purge gas conveying pipe, a conversion fuel gas pipe, a gas outlet adjusting valve, a pressure sensor, a conversion inlet heating pipe and a medium-temperature conversion furnace. The purge gas generated by the methanol device is effectively recovered and recycled, and is converted into available resources to be introduced into the system again, so that the utilization efficiency of gas resources in the system is remarkably improved, the waste of the gas resources is reduced, and the problem that the load of a certain set of device needs to be sacrificed due to insufficient gas is solved; the purge gas is effectively recycled, so that the condition that the load of the device is limited due to insufficient gas is reduced, and the methanol device and the synthetic ammonia device can operate closer to the designed productivity, thereby integrally improving the production efficiency of a chemical production line; by optimizing the distribution and utilization of gas resources, the additional production cost caused by sacrificing the load of the device is reduced.

Description

Technical field:

[0001] The utility model relates to the technical field of chemical industry, in particular to a methanol output optimization relaxation gas recycling device. Background technology:

[0002] In the chemical production process, the methanol unit and the synthetic ammonia unit are two important production units that often need to rely on and utilize the gas resources in the system. These gas resources, such as conversion gas and synthesis gas, are key factors to ensure the normal operation of the unit and achieve the predetermined production goals. However, in the actual production process, due to the fluctuation of the system gas volume and the difference in the gas resource demand of the two units, the gas volume is often insufficient.

[0003] When the system gas volume cannot meet the simultaneous full-load operation of two sets of devices, the traditional practice is often to sacrifice the load of one set of devices to give priority to the production of the other set of devices. Although this approach can ensure the continuity of production to a certain extent, it brings many adverse effects. First, sacrificing the load of one set of devices will directly lead to a decrease in the production efficiency of the device, thereby affecting the improvement of the overall production efficiency; secondly, in order to make up for the production loss of the sacrificed device, other measures may need to be taken, such as increasing raw material input, extending production time, etc., which will increase production costs. For this reason, a methanol production optimization relaxation gas recycling device is proposed. Utility model content:

[0004] The purpose of the utility model is to provide a methanol production optimization relaxation gas recycling device to solve one of the problems raised in the above background technology.

[0005] The utility model is implemented by the following technical scheme: a methanol production optimization relaxation gas recycling device, including a circulation component, the circulation component includes a water washing tower, a tee, a relaxation gas transmission and transformation pipe, a conversion fuel gas pipe, an outlet regulating valve, a pressure sensor, a conversion inlet heating pipe, a conversion gas delivery pipe and a medium-temperature conversion furnace, the outlet end of the water washing tower is connected to the relaxation gas transmission and transformation pipe and the conversion fuel gas pipe through the tee, the outer side wall of the relaxation gas transmission and transformation pipe is provided with an outlet regulating valve on the side close to the tee, the middle part of the outer side wall of the relaxation gas transmission and transformation pipe is provided with a pressure sensor, the outlet end of the relaxation gas transmission and transformation pipe is connected to the middle part of the outer side wall of the conversion inlet heating pipe, the outlet end of the conversion inlet heating pipe is connected to the middle part of the outer side wall of the conversion gas delivery pipe, and the outlet end of the conversion gas delivery pipe is connected to the air inlet end of the medium-temperature conversion furnace.

[0006] As a further preferred embodiment of the present technical solution: the air inlet end of the water scrubber is connected to a relaxation air inlet pipe, and an air inlet regulating valve is provided on one end of the outer wall of the relaxation air inlet pipe close to the water scrubber.

[0007] As a further optimization of this technical solution: A hydrogen gas inlet pipe is connected to the outer side wall of the conversion inlet heating pipe near the air inlet, and first solenoid valves are provided at one ends of the outer side walls of the conversion inlet heating pipe and the hydrogen gas inlet pipe near the air inlet.

[0008] As a further optimization of this technical solution: A heating gas outlet pipe is connected to the outer side wall of the converted gas delivery pipe near the air inlet, a second solenoid valve is provided at one end of the outer side wall of the heating gas outlet pipe near the converted gas delivery pipe, and an intake valve is provided at one end of the outer side wall of the converted gas delivery pipe near the air inlet.

[0009] As a further optimization of this technical solution: The middle part of the outer side wall of the heating gas outlet pipe is connected to the outer side wall of the conversion inlet heating pipe near the converted gas delivery pipe through a connecting pipe, a third solenoid valve is provided in the middle of the outer side wall of the connecting pipe, and a fourth solenoid valve is provided at one end of the outer side wall of the conversion inlet heating pipe near the air outlet.

[0010] As a further optimization of this technical solution: A branch pipe is connected to the outer side wall of the purge gas inlet pipe near the air inlet, the outlet end of the branch pipe is connected to the middle part of the outer side wall of the converted fuel gas pipe, and a fifth solenoid valve is provided in the middle of the outer side wall of the branch pipe.

[0011] As a further optimization of this technical solution: A sixth solenoid valve is provided on the outer side wall of the converted fuel gas pipe near the tee.

[0012] As a further optimization of this technical solution: A methanol separator is connected to the air inlet of the purge gas inlet pipe.

[0013] Advantages of the present utility model:

[0014] 1. By effectively recycling and reusing the purge gas generated by the methanol plant, the present utility model converts it into available resources and reintroduces them into the system, significantly improving the utilization efficiency of the gas resources inside the system. This not only reduces the waste of gas resources but also alleviates the problem of sacrificing the load of a certain device due to insufficient gas volume.

[0015] 2. Since the purge gas is effectively recycled in the present utility model, the situation of restricting the device load due to insufficient gas volume is reduced, enabling both the methanol plant and the ammonia synthesis plant to operate closer to their design production capacities, thereby overall improving the production efficiency of the chemical production line.

[0016] 2. By optimizing the distribution and utilization of gas resources, the present utility model reduces the additional production costs generated by sacrificing the device load, such as reducing the demand for additional raw materials and shortening the production time. In addition, in the long run, the efficient use of resources also helps to reduce the overall operating costs of the enterprise. Brief Description of the Drawings:

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural view of one perspective of the present invention;

[0019] Figure 2 It is a schematic structural view of another perspective of the present invention;

[0020] Figure 3 It is a schematic structural view of the water washing tower and the three-way joint of the present invention;

[0021] Figure 4 It is a schematic structural view of the medium-temperature shift furnace and the hydrogen inlet pipe of the present invention.

[0022] In the figure: 1. Circulation assembly; 11. Water washing tower; 12. Three-way joint; 13. Relaxed gas sending transformation pipe; 14. Conversion fuel gas pipe; 15. Outlet regulating valve; 16. Pressure sensor; 17. Shift inlet heating-up pipe; 18. Conversion gas conveying pipe; 19. Medium-temperature shift furnace; 20. Relaxed gas inlet pipe; 21. Inlet regulating valve; 22. Hydrogen inlet pipe; 23. First solenoid valve; 24. Heating-up gas outlet pipe; 25. Second solenoid valve; 26. Inlet valve; 27. Connecting pipe; 28. Third solenoid valve; 29. Fourth solenoid valve; 30. Branch pipe; 31. Fifth solenoid valve; 32. Sixth solenoid valve; 33. Methanol separator. Detailed Embodiments:

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0024] Embodiment

[0025] Please refer to Figures 1-4, the present utility model provides a technical solution: a device for optimizing the recycling of methanol production purge gas, including a recycling component 1. The recycling component 1 includes a water washing tower 11, a three-way valve 12, a purge gas transfer pipe 13, a reforming fuel gas pipe 14, an outlet regulating valve 15, a pressure sensor 16, a shift inlet heating pipe 17, a reformed gas transfer pipe 18, and a medium-temperature shift furnace 19. The outlet end of the water washing tower 11 is connected to the purge gas transfer pipe 13 and the reforming fuel gas pipe 14 through the three-way valve 12. On the outer side wall of the purge gas transfer pipe 13, an outlet regulating valve 15 is arranged near one side of the three-way valve 12, and a pressure sensor 16 is arranged in the middle of the outer side wall of the purge gas transfer pipe 13. The outlet end of the purge gas transfer pipe 13 is connected to the middle of the outer side wall of the shift inlet heating pipe 17. The outlet end of the shift inlet heating pipe 17 is connected to the middle of the outer side wall of the reformed gas transfer pipe 18. The outlet end of the reformed gas transfer pipe 18 is connected to the inlet end of the medium-temperature shift furnace 19. The water washing tower 11 is used for preliminarily washing the incoming purge gas to remove some impurities and moisture therein; by connecting the outlet end of the water washing tower 11 through the three-way valve 12, it is respectively led to the purge gas transfer pipe 13 and the reforming fuel gas pipe 14, thus realizing the gas shunt; through the purge gas transfer pipe 13, the washed purge gas is sent to the shift inlet heating pipe 17 for subsequent shift reaction. An outlet regulating valve 15 and a pressure sensor 16 are arranged on this pipeline for regulating the gas flow rate and monitoring the pressure; the reforming fuel gas pipe 14 sends part of the purge gas as fuel gas to other technological processes that require fuel; through the shift reaction in the medium-temperature shift furnace 19, more gas components beneficial to methanol synthesis are generated.

[0026] In this embodiment, specifically: the inlet end of the water washing tower 11 is connected to a purge gas inlet pipe 20. On the outer side wall of the purge gas inlet pipe 20, an inlet regulating valve 21 is arranged near one end of the water washing tower 11. The purge gas inlet pipe 20 and the inlet regulating valve 21 are used for receiving the purge gas from the methanol production process and regulating its inlet volume.

[0027] In this embodiment, specifically: on the outer side wall of the shift inlet heating pipe 17, a hydrogen inlet pipe 22 is connected near the inlet. On the outer side walls of the shift inlet heating pipe 17 and the hydrogen inlet pipe 22 near the inlet, a first solenoid valve 23 is arranged. The shift inlet heating pipe 17 receives the purge gas from the purge gas transfer pipe 13 and mixes hydrogen through the hydrogen inlet pipe 22 to increase the temperature and efficiency of the shift reaction.

[0028] In this embodiment, specifically: on the outer side wall of the reformed gas transfer pipe 18, a heated gas outlet pipe 24 is connected near the inlet. On the outer side wall of the heated gas outlet pipe 24 near the reformed gas transfer pipe 18, a second solenoid valve 25 is arranged. On the outer side wall of the reformed gas transfer pipe 18 near the inlet, an inlet valve 26 is arranged. Through the inlet valve 26, it is convenient to regulate the opening and closing of the reformed gas transfer pipe 18.

[0029] In this embodiment, specifically: The middle part of the outer sidewall of the heating gas outlet pipe 24 is connected to the outer sidewall of the conversion inlet heating pipe 17 on the side close to the conversion gas delivery pipe 18 through a connecting pipe 27. A third solenoid valve 28 is provided in the middle of the outer sidewall of the connecting pipe 27. A fourth solenoid valve 29 is provided at one end of the outer sidewall of the conversion inlet heating pipe 17 close to the air outlet. A circulation loop for heating gas is formed by the heating gas outlet pipe 24, the second solenoid valve 25, the connecting pipe 27, the third solenoid valve 28, and the fourth solenoid valve 29, which is used to adjust the temperature inside the conversion inlet heating pipe 17.

[0030] In this embodiment, specifically: A branch pipe 30 is connected to the outer sidewall of the purge gas inlet pipe 20 on the side close to the air inlet. The outlet end of the branch pipe 30 is connected to the middle part of the outer sidewall of the conversion fuel gas pipe 14. A fifth solenoid valve 31 is provided in the middle of the outer sidewall of the branch pipe 30.

[0031] In this embodiment, specifically: A sixth solenoid valve 32 is provided on the outer sidewall of the conversion fuel gas pipe 14 on the side close to the tee 12. Through the branch pipe 30, the fifth solenoid valve 31, and the sixth solenoid valve 32, the flexible distribution of the purge gas between the fuel gas and the conversion gas is realized.

[0032] In this embodiment, specifically: The air inlet of the purge gas inlet pipe 20 is connected to a methanol separator 33. Through the methanol separator 33, it is convenient to preliminarily separate the purge gas entering the system and remove the methanol component therein.

[0033] During the working principle or structural principle, in use, the purge gas generated during the methanol production process first enters the methanol separator 33 for methanol separation, and then enters the water wash tower 11 through the purge gas inlet pipe 20 for water wash treatment to remove some impurities and moisture. The water-washed purge gas is shunted through the tee 12 at the air outlet end of the water wash tower 11. Part of it enters the purge gas delivery to conversion pipe 13 as the gas source for the conversion reaction, and the other part enters the conversion fuel gas pipe 14 as the fuel gas for other processes. The purge gas entering the purge gas delivery to conversion pipe 13 is mixed with the possibly added hydrogen in the conversion inlet heating pipe 17, and after heating, it enters the medium-temperature conversion furnace 19 for the conversion reaction to generate more gas components beneficial to methanol synthesis. The gas after the conversion reaction is sent back to the synthesis system or undergoes other treatments through the conversion gas delivery pipe 18, realizing the effective recycling of the purge gas. Through components such as the outlet regulating valve 15 and the pressure sensor 16, the precise control and adjustment of the gas flow rate, pressure, and temperature of the entire system are realized, thereby ensuring the stable operation and efficient utilization of the system.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A methanol production optimization purge gas recycling device, characterized in that: The invention comprises a circulation component (1), wherein the circulation component (1) comprises a water scrubber (11), a tee (12), a relaxation gas transmission pipe (13), a conversion fuel gas pipe (14), an outlet gas regulating valve (15), a pressure sensor (16), a conversion inlet temperature-raising pipe (17), a conversion gas transmission pipe (18) and a medium-temperature conversion furnace (19), wherein the outlet end of the water scrubber (11) is connected to the relaxation gas transmission pipe (13) and the conversion fuel gas pipe (14) through the tee (12), and the relaxation gas transmission pipe (13) is connected to the conversion fuel gas pipe (14). 3) is provided with an outlet regulating valve (15) on one side of the outer wall close to the tee (12), a pressure sensor (16) is provided in the middle of the outer wall of the relaxation gas transmission and transformation pipe (13), the outlet end of the relaxation gas transmission and transformation pipe (13) is connected to the middle of the outer wall of the conversion inlet heating pipe (17), the outlet end of the conversion inlet heating pipe (17) is connected to the middle of the outer wall of the conversion gas delivery pipe (18), and the outlet end of the conversion gas delivery pipe (18) is connected to the inlet end of the medium temperature conversion furnace (19).

2. A methanol production optimization purge gas recycling device according to claim 1, characterized in that: The air inlet end of the water scrubber (11) is connected to a purge air inlet pipe (20), and an air inlet regulating valve (21) is provided on one end of the outer wall of the purge air inlet pipe (20) close to the water scrubber (11).

3. A methanol production optimization purge gas recycling device according to claim 1, characterized in that: The side of the outer wall of the conversion inlet heating pipe (17) close to the air inlet is connected to the hydrogen inlet pipe (22), and the ends of the outer walls of the conversion inlet heating pipe (17) and the hydrogen inlet pipe (22) close to the air inlet are both provided with a first solenoid valve (23).

4. A methanol production optimization purge gas recycling device according to claim 1, characterized in that: The side of the outer wall of the conversion gas delivery pipe (18) close to the air inlet is connected to a heating gas outlet pipe (24), the end of the outer wall of the heating gas outlet pipe (24) close to the conversion gas delivery pipe (18) is provided with a second solenoid valve (25), and the end of the outer wall of the conversion gas delivery pipe (18) close to the air inlet is provided with an air intake valve (26).

5. A methanol production optimization purge gas recycling device according to claim 4, characterized in that: The middle of the outer wall of the heated gas outlet pipe (24) is connected to the outer wall of the conversion inlet heated gas pipe (17) close to the conversion gas delivery pipe (18) through a connecting pipe (27), and a third solenoid valve (28) is provided in the middle of the outer wall of the connecting pipe (27), and a fourth solenoid valve (29) is provided at one end of the outer wall of the conversion inlet heated gas pipe (17) close to the gas outlet.

6. A methanol production optimization purge gas recycling device according to claim 2, characterized in that: A branch pipe (30) is connected to the side of the outer wall of the relaxation gas intake pipe (20) close to the air inlet, and the outlet end of the branch pipe (30) is connected to the middle part of the outer wall of the conversion fuel gas pipe (14). A fifth solenoid valve (31) is provided in the middle part of the outer wall of the branch pipe (30).

7. A methanol production optimization purge gas recycling device according to claim 6, characterized in that: A sixth solenoid valve (32) is provided on the side of the outer wall of the conversion fuel gas pipe (14) close to the three-way connection (12).

8. A methanol production optimization purge gas recycling device according to claim 7, characterized in that: The air inlet of the purge gas inlet pipe (20) is connected to a methanol separator (33).

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