Oxygen supply device of methanol production system

Abstract

The utility model relates to an oxygen supply device of a methanol production system, which comprises a rectifying tower, the rectifying tower sequentially comprises an upper tower, a condensing evaporator and a lower tower from top to bottom, a finished product oxygen delivery pipe is arranged on the upper tower, and a liquid oxygen delivery header pipe is arranged on the condensing evaporator. The finished product oxygen conveying pipe is provided with a main heat exchanger, a pressurization vaporization tank and the inlet end of a buffer tank, a liquid oxygen spray head is arranged in the pressurization vaporization tank, a liquid oxygen conveying header pipe is provided with a liquid oxygen pressurization pump, a liquid oxygen conveying branch pipe and a first adjusting valve, the liquid oxygen conveying branch pipe is provided with a second adjusting valve, and the liquid oxygen conveying branch pipe is communicated with the liquid oxygen spray head. And an oxygen pressurizing device is arranged on the buffer tank and comprises a pressurizing pipe and an oxygen compressor unit arranged on the pressurizing pipe. The pressurization amplitude of the oxygen compressor unit on finished oxygen can be shortened, so that the load of the oxygen compressor unit is reduced, and the energy consumption of the oxygen compressor unit is reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] This utility model relates to the field of oxygen supply equipment for methanol production systems, and specifically to an oxygen supply device for methanol production systems. Background Technology

[0002] Biomass is a crucial energy source for sustainable development, significantly reducing carbon dioxide emissions during its production and utilization. With dwindling oil and natural gas reserves and increasing environmental pressures in recent years, research on obtaining liquid fuels from biomass using thermochemical methods has gained increasing attention. Methanol is a vital organic chemical raw material, a fundamental product of C1 chemistry, and also a clean fuel. With the increasing number of methanol-processed products and the expanding research field in methanol chemistry, methanol's role in the national economy has become increasingly important. Comparative studies have shown that synthesizing methanol via biomass gasification (i.e., indirect liquefaction) offers advantages such as high efficiency, low cost, and ease of large-scale production, making it one of the most promising methods for producing liquid fuels from biomass. The main processes for synthesizing methanol from biomass gasification include: biomass pretreatment, pyrolysis gasification, gas purification, gas reforming, H2 / CO ratio adjustment, methanol synthesis, and separation and purification.

[0003] A methanol production plant comprises a gasification plant and a methanol plant. The gasifier uses oxygen / water vapor as the gasification medium. A biomass feeding system utilizes N2 and CO2 / H2O generated by air equipment to remove carbon dioxide produced in the degassing unit. The purified and adjusted gas enters the methanol synthesis plant, where it is compressed to synthesize methanol. Specifically, biomass is gasified in a fluidized bed gasifier to produce crude feed gas, mainly containing CO, H2, CO2, and CH4. The generated feed gas is cooled to recover heat and washed with water to remove particulate impurities. The gas then passes through a CO conversion unit to increase the H2 content. The converted gas is further desulfurized before entering the methanol synthesis unit to synthesize methanol. The exhaust gas is introduced into an autothermal reformer, where methane reacts with oxygen and water vapor to improve the quality of the synthesis gas, which is then recycled back to the methanol synthesis unit. The produced methanol is distilled and upgraded to fuel-grade methanol. Water vapor is generated during feed gas cooling, methanol synthesis, and the ATR unit; this water vapor, along with oxygen, serves as the gasification medium or a heat source for other units.

[0004] Therefore, methanol manufacturing plants require a supporting air separation system to supply gases such as nitrogen and oxygen to ensure the smooth operation of the methanol manufacturing process. For methanol manufacturers, the air separation system corresponding to a cryogenic distillation system, although requiring a higher initial investment, offers advantages in terms of overall product output and is the commonly used air separation system. However, regarding oxygen supply, since the methanol production process requires oxygen to supply multiple stages with varying oxygen pressures, it is more rational to pressurize the air separation distillation system to a predetermined pressure range and then depressurize and supply oxygen to each stage of the methanol production process to simplify the system and reduce costs. The finished oxygen produced directly from the distillation process in the air separation system is at a low pressure. Pressurizing this finished oxygen inevitably requires an oxygen compressor unit, whose energy consumption directly affects the energy consumption parameters of the air separation system. The energy consumption parameters of the air separation system are a crucial process indicator for evaluating the rationality of its design. Therefore, there is room for improvement in reducing the power consumption of the oxygen compressor unit, thereby reducing the energy consumption of the entire air separation system. This would allow for a more rational design of the air separation system and reduce the direct energy costs incurred by customers in operating the air separation system. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this utility model provides an oxygen supply device for a methanol production system that can shorten the pressurization range of the oxygen compressor unit to produce finished oxygen, thereby reducing the load on the oxygen compressor unit and thus reducing its energy consumption, in order to overcome the deficiencies in existing technologies.

[0006] The technical solution adopted by this utility model is as follows: an oxygen supply device for a methanol production system, including a distillation column, which comprises an upper column, a condenser / evaporator, and a lower column from top to bottom. A finished product oxygen delivery pipe is installed on the upper column, and a liquid oxygen delivery main pipe is installed on the cold source channel of the condenser / evaporator. The finished product oxygen delivery pipe, along the direction from near to far from the upper column, has the inlet end of a main heat exchanger, a pressurized vaporization tank, and a buffer tank. The pressurized vaporization tank has the outlet end of a liquid oxygen nozzle. The liquid oxygen delivery main pipe, along the direction from near to far from the condenser / evaporator, has a liquid oxygen booster pump, the inlet end of a liquid oxygen delivery branch pipe, and a first regulating valve. A second regulating valve is installed on the liquid oxygen delivery branch pipe, and the outlet end of the liquid oxygen delivery branch pipe is connected to the inlet end of the liquid oxygen nozzle. An oxygen booster device is installed on the outlet end of the buffer tank, and the oxygen booster device includes a booster pipe and an oxygen compressor unit installed on the booster pipe.

[0007] Preferably, the oxygen booster device further includes a first shut-off valve, a first pressure sensor, an inlet end of a pressure relief branch pipe and a second shut-off valve, and a third regulating valve arranged sequentially along the direction from near the buffer tank to far away from the buffer tank on the booster pipe; the oxygen compressor unit is located between the first shut-off valve and the first pressure sensor; the number of oxygen booster devices is at least two, and several oxygen booster devices are connected in parallel with each other; a booster oxygen delivery pipe is provided at the outlet end of several booster pipes, and a pressure relief main pipe is provided at the outlet end of several pressure relief branch pipes.

[0008] Preferably, the buffer tank is equipped with a pressure relief valve and a second pressure sensor; the finished oxygen delivery pipe between the main heat exchanger and the pressurized vaporization tank is equipped with a gas flow sensor and a first check valve; the liquid oxygen delivery branch pipe is equipped with a liquid flow sensor; the finished oxygen delivery pipe between the pressurized vaporization tank and the buffer tank is equipped with a second check valve; and the finished oxygen delivery pipe between the second check valve and the buffer tank is equipped with a temperature sensor.

[0009] Preferably, the liquid oxygen nozzle includes a guide tube, a valve body disposed at the outlet end of the guide tube, a first spray seat disposed at one end of the valve body, a second spray seat disposed inside the valve body on one side of the first spray seat, a spray bar disposed on the second spray seat and the first spray seat, a spring disposed on the second spray seat and the first spray seat, a through hole disposed on the first spray seat on the outside of the spray bar, an adjusting nut disposed on the spray bar on the side of the second spray seat away from the first spray seat, and an end cap disposed on the end of the valve body away from the first spray seat.

[0010] Preferably, the end cap and valve body are provided with a first fixing bolt, the valve body and the first spray seat are threadedly connected, and the spray rod and the adjusting nut are threadedly connected; the spray rod includes a cone part and a connecting rod part, the cone part is partially attached to the first spray seat, and the connecting rod part is installed through the first spray seat and the second spray seat; the number of through holes is several, and the several through holes are evenly distributed in a star shape on the outside of the central axis of the spray rod; the guide pipe is connected to the liquid oxygen delivery branch pipe; a sealing ring is provided between the valve body and the end cap.

[0011] Preferably, it also includes a compressed air supply main pipe, a first compressed air supply branch pipe provided on the compressed air supply main pipe and the main heat exchanger, a second compressed air supply branch pipe provided on the compressed air supply main pipe, the main heat exchanger and the lower tower, a fourth regulating valve provided on the second compressed air supply branch pipe, a fifth regulating valve and a pressurization end of the turbine expander provided on the first compressed air supply branch pipe between the compressed air supply main pipe and the main heat exchanger, the inlet of the expansion end of the turbine expander is connected to the outlet end of the first compressed air supply branch pipe, and the outlet of the expansion end of the turbine expander is connected to the upper tower.

[0012] Preferably, a first liquid nitrogen delivery pipe is provided between the outlet end of the upper tower and the heat source channel of the condenser-evaporator, a second liquid nitrogen delivery pipe is provided between the outlet end of the heat source channel of the condenser-evaporator and the lower tower, an oxygen-enriched liquid air delivery pipe is provided between the upper tower and the lower tower, a waste nitrogen delivery pipe and a finished nitrogen delivery pipe are provided on the upper tower and the main heat exchanger, and an overcooler is provided on the waste nitrogen delivery pipe between the upper tower and the main heat exchanger, the finished nitrogen delivery pipe between the upper tower and the main heat exchanger, the oxygen-enriched liquid air delivery pipe and the first liquid nitrogen delivery pipe, a sixth regulating valve is provided on both the first liquid nitrogen delivery pipe and the second liquid nitrogen delivery pipe, and a seventh regulating valve and a liquid air booster pump are provided on the oxygen-enriched liquid air delivery pipe.

[0013] The beneficial effects of this utility model are as follows: First, this product utilizes the relatively high-temperature low-pressure oxygen formed by the finished oxygen transported from the upper tower through the cold source channel of the main heat exchanger and the heat source continuously supplied to the upper tower, which directly exchanges heat with the liquid oxygen transported by the liquid oxygen nozzle. The liquid oxygen is vaporized, thereby causing the low-pressure oxygen pressure to rise. Finally, the oxygen is further pressurized by the oxygen booster device in use and then transported to the customer. Compared with the prior art, the pressurization range of the oxygen compressor unit in the oxygen booster device in use is smaller, thereby reducing the load of the oxygen compressor unit in use and thus reducing the energy consumption of the oxygen compressor unit. Furthermore, since the liquid oxygen injected into the booster vaporization tank and the finished oxygen transported to the booster vaporization tank by the finished oxygen delivery pipe are directly mixed, the temperature of the oxygen entering the buffer tank is reduced, thereby reducing the initial temperature of the oxygen entering the oxygen compressor unit for pressurization, and thus reducing the temperature of the oxygen after being pressurized by the oxygen compressor unit, thereby improving the safety of the oxygen compressor unit in using oxygen pressurization.

[0014] Secondly, the oxygen booster device of this utility model also includes a first shut-off valve, a first pressure sensor, an inlet end of a pressure relief branch pipe and a second shut-off valve, and a third regulating valve installed on the pressure relief branch pipe, arranged sequentially along the direction from near the buffer tank to far away from the buffer tank on the booster pipe; the installation of the first pressure sensor facilitates the feedback of pressure parameters.

[0015] Finally, a liquid level sensor is installed at the bottom of the lower column of this invention; the installation of the liquid level sensor facilitates the feedback of the liquid level parameters at the bottom of the lower column.

[0016] This utility model has a simple structure, is easy to operate, and has a clever design, which greatly improves work efficiency and has good social and economic benefits. It is a product that is easy to promote and use. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 for Figure 1 A magnified view of detail A.

[0019] Figure 3 This is a schematic diagram of the liquid oxygen nozzle of this utility model. Detailed Implementation

[0020] like Figures 1 to 3 As shown, an oxygen supply device for a methanol production system includes a distillation column, which, from top to bottom, comprises an upper column 1, a condenser-evaporator 2, and a lower column 3. A finished product oxygen delivery pipe 4 is installed on the upper column 1. A liquid oxygen delivery main pipe 5 is installed on the cold source channel of the condenser-evaporator 2. Along the direction from near to far from the upper column 1, the finished product oxygen delivery pipe 4 sequentially includes the inlet end of a main heat exchanger 6, a pressurized vaporization tank 7, and a buffer tank 9. A liquid oxygen nozzle is installed inside the pressurized vaporization tank 7. At the outlet end, the liquid oxygen main pipe 5 is sequentially provided with a liquid oxygen booster pump 10, the inlet end of the liquid oxygen delivery branch pipe 11 and a first regulating valve 12 along the direction from near the condenser evaporator 2 to away from the condenser evaporator 2. A second regulating valve 13 is provided on the liquid oxygen delivery branch pipe 11. The outlet end of the liquid oxygen delivery branch pipe 11 is connected to the inlet end of the liquid oxygen nozzle. An oxygen booster device is provided on the outlet end of the buffer tank 9. The oxygen booster device includes a booster pipe 14 and an oxygen compressor unit 15 provided on the booster pipe 14.

[0021] This product also includes a compressed air main pipe 43, a first compressed air supply branch pipe 44 on the compressed air main pipe 43 and the main heat exchanger 6, a second compressed air supply branch pipe 45 on the compressed air main pipe 43, the main heat exchanger 6 and the lower tower 3, a fourth regulating valve 46 on the second compressed air supply branch pipe 45, a fifth regulating valve 47 and a pressurization end of a turbine expander 48 on the first compressed air supply branch pipe 44 between the compressed air main pipe 43 and the main heat exchanger 6, the inlet of the expansion end of the turbine expander 48 is connected to the outlet end of the first compressed air supply branch pipe 44, and the outlet of the expansion end of the turbine expander 48 is connected to the upper tower 1. A first liquid nitrogen delivery pipe 49 is provided between the outlet end of the heat source channel of the upper tower 1 and the condenser-evaporator 2. A second liquid nitrogen delivery pipe 50 is provided between the outlet end of the heat source channel of the condenser-evaporator 2 and the lower tower 3. An oxygen-enriched liquid air delivery pipe 51 is provided between the upper tower 1 and the lower tower 3. A waste nitrogen delivery pipe 52 and a finished nitrogen delivery pipe 53 are provided on the upper tower 1 and the main heat exchanger 6. An overcooler 54 is provided on the waste nitrogen delivery pipe 52 between the upper tower 1 and the main heat exchanger 6, the finished nitrogen delivery pipe 53 between the upper tower 1 and the main heat exchanger 6, the oxygen-enriched liquid air delivery pipe 51, and the first liquid nitrogen delivery pipe 49. A sixth regulating valve 55 is provided on both the first liquid nitrogen delivery pipe 49 and the second liquid nitrogen delivery pipe 50. A seventh regulating valve 56 and a liquid air booster pump 57 are provided on the oxygen-enriched liquid air delivery pipe 51.

[0022] The oxygen booster device further includes a booster pipe 14 with a first shut-off valve 16, a first pressure sensor 17, an inlet end of a pressure relief branch pipe 18 and a second shut-off valve 19, and a third regulating valve 20 installed on the pressure relief branch pipe 18, arranged sequentially along the direction from near the buffer tank 9 to away from the buffer tank 9; the oxygen compressor unit 15 is located between the first shut-off valve 16 and the first pressure sensor 17; the number of oxygen booster devices is at least two, and several oxygen booster devices are connected in parallel with each other; a booster oxygen delivery pipe 21 is installed on the outlet end of several booster pipes 14, and a pressure relief main pipe 22 is installed on the outlet end of several pressure relief branch pipes 18; thereby reducing the safety hazards caused by excessive pressure in the booster pipe 14 due to excessive instantaneous pressure.

[0023] The buffer tank 9 is equipped with a pressure relief valve 23 and a second pressure sensor 24. The finished oxygen delivery pipe 4 between the main heat exchanger 6 and the pressurized vaporization tank 7 is equipped with a gas flow sensor 25 and a first check valve 26. The gas flow sensor 25 facilitates feedback on the flow rate of oxygen delivered to the buffer tank 9 via the finished oxygen delivery pipe 4. A liquid flow sensor 27 is installed on the liquid oxygen delivery branch pipe 11 to facilitate feedback on the flow rate of liquid oxygen delivered sequentially through the liquid oxygen delivery branch pipe 11 and the liquid oxygen nozzle into the inner cavity of the buffer tank 9. A second check valve 28 is installed on the finished oxygen delivery pipe 4 between the pressurized vaporization tank 7 and the buffer tank 9. A temperature sensor 29 is installed on the finished oxygen delivery pipe 4 between the second check valve 28 and the buffer tank 9.

[0024] The liquid oxygen nozzle includes a guide tube 30, a valve body 31 disposed at the outlet end of the guide tube 30, a first spray seat 32 disposed at one end of the valve body 31, a second spray seat 33 disposed inside the valve body 31 on one side of the first spray seat 32, a spray rod 34 disposed on the second spray seat 33 and the first spray seat 32, a spring 35 disposed on the second spray seat 33 and the first spray seat 32, a through hole 36 disposed on the first spray seat 32 on the outer side of the spray rod 34, an adjusting nut 37 disposed on the spray rod 34 on the side of the second spray seat 33 away from the first spray seat 32, and an end cap 38 disposed on the end of the valve body 31 away from the first spray seat 32. Adjusting the position of the adjusting nut 37 on the spray rod 34 facilitates adjusting the compression of the spring 35, thereby facilitating the adjustment of the minimum pressure required for the spray rod 34 to separate from the first spray seat 32.

[0025] Furthermore, the end cap 38 and valve body 31 are provided with first fixing bolts, the valve body 31 and the first spray seat 32 are threadedly connected, and the spray rod 34 and the adjusting nut 37 are threadedly connected. The spray rod 34 includes a cone part and a connecting rod part. The cone part and the first spray seat 32 are in contact. The liquid oxygen delivered through the liquid oxygen delivery branch pipe 11 is delivered into the valve body 31 and delivered into the inner cavity of the buffer tank 9 through the gap between the cone part and the first spray seat 32. In this process, the cone part plays a guiding role, thereby increasing the spraying area of ​​the liquid oxygen delivered outward through the gap between the cone part and the first spray seat 32, and indirectly increasing the dispersion of the liquid oxygen delivered from the liquid oxygen nozzle in the finished oxygen delivered from the finished oxygen delivery pipe 4 to the buffer tank 9. The connecting rod is installed through the first spray seat 32 and the second spray seat 33; there are several through holes 36, which are evenly distributed in a star shape on the outside of the central axis of the spray rod 34; the guide pipe 30 is connected to the liquid oxygen delivery branch pipe 11; a sealing ring 39 is provided between the valve body 31 and the end cover 38.

[0026] The pressurized vaporization tank 7, from its inlet to its outlet, comprises a first end cap, a tank body, and a second end cap. A first flange 40 is located on the end of the first end cap near the tank body, and a second flange 41 is located on the end of the second end cap near the tank body. Third flanges 42 are located on both the end of the tank body near the first flange 40 and the end of the tank body near the second flange 41. Second fixing bolts are installed on the first flange 40 and the adjacent third flange 42, as well as on the second flange and the adjacent third flange 42. A level sensor 58 is installed at the bottom of the lower tower 3. Discharge pipes 59 are installed at the bottom of both the lower tower 3 and the buffer tank 9, and third shut-off valves 60 are installed on the discharge pipes 59.

[0027] The usage instructions for this product are as follows: Figures 1 to 3 As shown, it includes the following steps:

[0028] S1. The compressed air, after being adsorbed by the purification system, is delivered to the main compressed air delivery pipe 43 and then divided into two parts, namely the first part of compressed air and the second part of compressed air. The first part of compressed air is delivered to the first compressed air delivery branch pipe 44, pressurized by the pressurization end of the turbine expander 48, and then delivered to the first heat source channel of the main heat exchanger 6 for heat exchange with the cold source continuously supplied to the main heat exchanger 6. After heat exchange, it is delivered to the expansion end of the turbine expander 48 for expansion and cooling, and then sent to the upper column 1 as the gaseous distillation feedstock of the upper column 1. The second part of compressed air is delivered to the second compressed air delivery branch pipe 45, heat exchanged by the second heat source channel of the main heat exchanger 6 and the cold source continuously supplied to the main heat exchanger 6, and then sent to the lower column 3 as the distillation feedstock of the lower column 3.

[0029] S2. The second portion of compressed air entering the lower tower 3 forms the first upward airflow of the lower tower 3. The first upward airflow continues to rise along the inner cavity of the lower tower 3 and continuously exchanges heat with the first reflux condensate that continues to flow downward along the inner cavity of the lower tower 3. Finally, a first nitrogen enrichment zone is formed at the top of the lower tower 3 and an oxygen-rich liquid air enrichment zone is formed at the bottom of the lower tower 3. The first nitrogen enrichment zone continuously supplies high-pressure nitrogen to the heat source channel of the condenser-evaporator 2. After exchanging heat with the medium in the cold source channel of the condenser-evaporator 2, the nitrogen is liquefied to form liquid nitrogen and is divided into two parts, namely, the first part of liquid nitrogen... Nitrogen and a second portion of liquid nitrogen are transported. The first portion of liquid nitrogen is transported to the upper column 1 via the first liquid nitrogen transport pipe 49 as the second reflux condensate of the upper column 1. During this process, it passes through the first heat source channel of the cooler 54 and the cold source continuously supplied to the subcooler 54 for heat exchange. The second portion of liquid nitrogen is transported to the lower column 3 via the second liquid nitrogen transport pipe 50 as the first reflux condensate of the lower column 3. The oxygen-enriched liquid air enrichment zone is transported to the oxygen-enriched liquid air transport pipe 51 and then passes through the second heat source channel of the cooler 54 and the cold source continuously supplied to the subcooler 54 for heat exchange before being transported to the upper column 1 as the liquid distillation feedstock of the upper column 1.

[0030] S3. After the first part of compressed air enters the upper tower 1, it forms a second rising airflow. The second rising airflow continues to rise along the inner cavity of the upper tower 1, and then first exchanges heat with the oxygen-enriched liquid air that is supplied to the upper tower 1 via the oxygen-enriched liquid air delivery pipe 51 and continues to descend along the inner cavity of the upper tower 1 in a countercurrent manner. Then, it exchanges heat with the second reflux condensate that continues to descend along the inner cavity of the upper tower 1 in a countercurrent manner. Finally, a second nitrogen enrichment zone is formed at the top of the upper tower 1, while a liquid oxygen enrichment zone is formed in the cold source channel of the condenser-evaporator 2, and a finished product oxygen enrichment zone is formed at the bottom of the upper tower 1. The finished product oxygen enrichment zone continuously supplies low-pressure oxygen to the finished product oxygen delivery pipe 4. The low-pressure oxygen exchanges heat with the second cold source channel of the main heat exchanger 6 and the heat source that is continuously supplied to the main heat exchanger 6, and then continues to be supplied to the inner cavity of the pressurized vaporization tank 7. The second nitrogen enrichment zone supplies finished nitrogen to the finished nitrogen delivery pipe 53. The finished nitrogen is first supplied to the first cold source channel of the subcooler 54 and then continuously supplied to the heat source of the subcooler 54 for heat exchange. After heat exchange, it is then supplied to the first cold source channel of the main heat exchanger 6 and then continuously supplied to the heat source of the main heat exchanger 6 for heat exchange before being delivered to the target user. The liquid oxygen enrichment zone continuously supplies liquid oxygen products to the liquid oxygen delivery main pipe 5. A waste nitrogen enrichment zone is formed in the inner cavity of the upper tower 1 below the second nitrogen enrichment zone. The waste nitrogen enrichment zone continuously supplies waste nitrogen to the waste nitrogen delivery pipe 52. The waste nitrogen first enters the second cold source channel of the subcooler 54 and then continuously supplied to the heat source of the subcooler 54 for heat exchange. After heat exchange, it is then supplied to the second cold source channel of the main heat exchanger 6 and then continuously supplied to the heat source of the main heat exchanger 6 for heat exchange before being delivered to the target user.

[0031] S4. The liquid oxygen product is divided into two parts, namely, a first part of liquid oxygen and a second part of liquid oxygen. The first part of liquid oxygen continues to travel along the main liquid oxygen delivery pipe 5 to the liquid oxygen storage tank. The second part of liquid oxygen is delivered to the inner cavity of the pressurized vaporization tank 7 via the liquid oxygen delivery branch pipe 11 and the liquid oxygen nozzle. After entering the inner cavity of the pressurized vaporization tank 7, the second part of liquid oxygen directly mixes with the low-pressure oxygen delivered to the inner cavity of the pressurized vaporization tank 7 by the finished oxygen delivery pipe 4 to form a gas-liquid mixture. The liquid phase in the gas-liquid mixture is continuously vaporized by the heat carried by the gas phase. When the gas-liquid mixture is discharged from the inner cavity of the pressurized vaporization tank 7, it forms oxygen that has been pressurized for the first time and is sent to the buffer tank 9 for temporary storage. Finally, it is pressurized a second time by the oxygen pressurization device in use and then delivered to the target user.

[0032] In this embodiment, the product utilizes the relatively high-temperature low-pressure oxygen formed by the finished oxygen transported from the upper tower 1 through the cold source channel of the main heat exchanger 6 and the heat source continuously supplied to the upper tower 1, which directly exchanges heat with the liquid oxygen transported by the liquid oxygen nozzle. The liquid oxygen is vaporized, thereby causing the low-pressure oxygen pressure to rise. Finally, the oxygen is further pressurized by the oxygen booster device in use and transported to the customer. Compared with the prior art, the pressurization range of the oxygen compressor unit 15 in the oxygen booster device in use is reduced, thereby reducing the load of the oxygen compressor unit 15 in use and thus reducing the energy consumption of the oxygen compressor unit 15. Furthermore, since the liquid oxygen is injected into the pressurization vaporization tank 7 and the finished oxygen transported to the pressurization vaporization tank 7 by the finished oxygen delivery pipe 4 is directly mixed, the temperature of the oxygen entering the buffer tank 9 is reduced, thereby reducing the initial temperature of the oxygen entering the oxygen compressor unit 15 for pressurization, and thus reducing the temperature of the oxygen after pressurization by the oxygen compressor unit 15, thereby improving the safety of the oxygen compressor unit 15 in using oxygen pressurization.

[0033] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. An oxygen supply device for a methanol production system, comprising a distillation column, wherein the distillation column comprises, from top to bottom, an upper column (1), a condenser-evaporator (2), and a lower column (3), wherein a finished product oxygen delivery pipe (4) is provided on the upper column (1), and a liquid oxygen delivery main pipe (5) is provided on the cold source channel of the condenser-evaporator (2), characterized in that: The finished oxygen delivery pipe (4) is provided with the inlet end of the main heat exchanger (6), the pressurized vaporization tank (7) and the buffer tank (9) in sequence along the direction from near the upper tower (1) to away from the upper tower (1). The pressurized vaporization tank (7) is provided with the outlet end of the liquid oxygen nozzle. The liquid oxygen delivery main pipe (5) is provided with the inlet end of the liquid oxygen booster pump (10), the liquid oxygen delivery branch pipe (11) and the first regulating valve (12) in sequence along the direction from near the condenser evaporator (2) to away from the condenser evaporator (2). The liquid oxygen delivery branch pipe (11) is provided with the second regulating valve (13). The outlet end of the liquid oxygen delivery branch pipe (11) is connected to the inlet end of the liquid oxygen nozzle. The outlet end of the buffer tank (9) is provided with an oxygen booster device. The oxygen booster device includes a booster pipe (14) and an oxygen compressor unit (15) provided on the booster pipe (14).

2. The oxygen supply device for the methanol production system according to claim 1, characterized in that: The oxygen booster device further includes a booster pipe (14) with a first shut-off valve (16), a first pressure sensor (17), the inlet end of a pressure relief branch pipe (18) and a second shut-off valve (19) arranged sequentially along the direction from near the buffer tank (9) to away from the buffer tank (9), and a third regulating valve (20) arranged on the pressure relief branch pipe (18); the oxygen compressor unit (15) is located between the first shut-off valve (16) and the first pressure sensor (17); the number of oxygen booster devices is at least two, and several oxygen booster devices are connected in parallel with each other, a booster oxygen delivery pipe (21) is arranged on the outlet end of several booster pipes (14), and a pressure relief main pipe (22) is arranged on the outlet end of several pressure relief branch pipes (18).

3. The oxygen supply device for the methanol production system according to claim 1, characterized in that: The buffer tank (9) is equipped with a pressure relief valve (23) and a second pressure sensor (24). The finished oxygen delivery pipe (4) between the main heat exchanger (6) and the pressurized vaporization tank (7) is equipped with a gas flow sensor (25) and a first check valve (26). The liquid oxygen delivery branch pipe (11) is equipped with a liquid flow sensor (27). The finished oxygen delivery pipe (4) between the pressurized vaporization tank (7) and the buffer tank (9) is equipped with a second check valve (28). The finished oxygen delivery pipe (4) between the second check valve (28) and the buffer tank (9) is equipped with a temperature sensor (29).

4. The oxygen supply device for the methanol production system according to claim 1, characterized in that: The liquid oxygen nozzle includes a guide tube (30), a valve body (31) provided at the outlet end of the guide tube (30), a first spray seat (32) provided at one end of the valve body (31), a second spray seat (33) provided inside the valve body (31) on one side of the first spray seat (32), a spray rod (34) provided on the second spray seat (33) and the first spray seat (32), a spring (35) provided on the second spray seat (33) and the first spray seat (32), a through hole (36) provided on the first spray seat (32) outside the spray rod (34), an adjusting nut (37) provided on the spray rod (34) on the side of the second spray seat (33) away from the first spray seat (32), and an end cap (38) provided on the end of the valve body (31) away from the first spray seat (32).

5. The oxygen supply device for the methanol production system according to claim 4, characterized in that: The end cap (38) and valve body (31) are provided with first fixing bolts, the valve body (31) and the first spray seat (32) are threadedly connected, and the spray rod (34) and the adjusting nut (37) are threadedly connected; the spray rod (34) includes a cone part and a connecting rod part, the cone part and the first spray seat (32) are partially attached, and the connecting rod part is installed through the first spray seat (32) and the second spray seat (33); the number of through holes (36) is several, and the several through holes (36) are evenly distributed in a star shape on the outside of the central axis of the spray rod (34); the guide pipe (30) and the liquid oxygen delivery branch pipe (11) are connected; a sealing ring (39) is provided between the valve body (31) and the end cap (38).

6. The oxygen supply device for the methanol production system according to claim 1, characterized in that: It also includes a compressed air main pipe (43), a first compressed air branch pipe (44) on the compressed air main pipe (43) and the main heat exchanger (6), a second compressed air branch pipe (45) on the compressed air main pipe (43), the main heat exchanger (6) and the lower tower (3), a fourth regulating valve (46) on the second compressed air branch pipe (45), a fifth regulating valve (47) and the pressurization end of the turbine expander (48) on the first compressed air branch pipe (44) between the compressed air main pipe (43) and the main heat exchanger (6), the inlet of the expansion end of the turbine expander (48) is connected to the outlet end of the first compressed air branch pipe (44), and the outlet of the expansion end of the turbine expander (48) is connected to the upper tower (1).

7. The oxygen supply device for the methanol production system according to claim 6, characterized in that: A first liquid nitrogen delivery pipe (49) is provided between the outlet end of the heat source channel of the upper tower (1) and the condenser-evaporator (2), a second liquid nitrogen delivery pipe (50) is provided between the outlet end of the heat source channel of the condenser-evaporator (2) and the lower tower (3), an oxygen-enriched liquid air delivery pipe (51) is provided between the upper tower (1) and the lower tower (3), and a waste nitrogen delivery pipe (52) and a finished nitrogen delivery pipe (53) are provided on the upper tower (1) and the main heat exchanger (6). An overcooler (54) is installed on the waste nitrogen gas delivery pipe (52) between the heat exchangers (6), the finished nitrogen gas delivery pipe (53) between the upper tower (1) and the main heat exchanger (6), the oxygen-enriched liquid air delivery pipe (51), and the first liquid nitrogen delivery pipe (49). A sixth regulating valve (55) is installed on the first liquid nitrogen delivery pipe (49) and the second liquid nitrogen delivery pipe (50). A seventh regulating valve (56) and a liquid air booster pump (57) are installed on the oxygen-enriched liquid air delivery pipe (51).

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