Air supply device of air separation rectification system

Abstract

The utility model relates to an air supply device of an air separation rectification system, which comprises a first compressed air conveying header pipe and at least two molecular sieve adsorption tanks, a first conveying pipe is arranged between each molecular sieve adsorption tank and the first compressed air conveying header pipe, and each molecular sieve adsorption tank is correspondingly provided with a second conveying pipe. A second compressed air conveying header pipe is arranged on the second conveying pipe, a first compressed air conveying branch pipe is arranged on the second compressed air conveying header pipe, and the first compressed air conveying branch pipe is provided with the expansion end of a turbo expander, a first adjusting valve, a first buffer tank, a machine rear heat exchanger and the pressurization end of the turbo expander; a first pressure regulating pipe is arranged on the first compressed air conveying branch pipe, a second regulating valve is arranged on the first pressure regulating pipe, and a third conveying pipe is arranged between the molecular sieve adsorption tank and the first pressure regulating pipe. And the fluctuation amplitude and period generated by compressed air in the switching process of the purification device are reduced. The utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of gas supply equipment for an air separation and distillation system, in particular to a gas supply device for an air separation and distillation system. Background Art

[0002] Cryogenic distillation is also known as cryogenic separation. The principle of cryogenic air separation is to use air as raw material, compress, purify, and use heat exchange to liquefy air into liquid air. Liquid air is mainly a mixture of liquid oxygen and liquid nitrogen. The different boiling points of liquid oxygen and liquid nitrogen are used to separate them through distillation to obtain nitrogen and oxygen. Specifically, the raw air is filtered out of dust and mechanical impurities by a self-cleaning filter, and then enters the main air compressor. The compressed gas is cooled by the air pre-cooling device and sent to the purification device to remove impurities such as water and carbon dioxide to form adsorbed compressed air. The adsorbed compressed air is sent to the distillation tower as raw material for cryogenic distillation after heat exchange with the main heat exchanger and other gas media. According to instrument air, it refers to the driving air source for pneumatic actuators in general chemical companies. GB / T4830-2015 "Industrial Automatic Instrument Gas Source Pressure Range and Quality" defines the dew point, dust particle size and oil content of the instrument gas source quality, and describes in "pollutants" that there should be no obvious harmful gases or vapors in the gas source. Therefore, a portion of the compressed air after adsorption is often extracted for use as instrument gas.

[0003] After all, the adsorption capacity of a single purification device is limited. In actual working conditions, two purification devices are usually set up. The specific reason is that when one purification device is in working state, the other purification device can be regenerated and used as standby. The regeneration process of the purification device includes the reverse flow of dirty nitrogen from the cold box system is first heated by an electric heater and then sent to the adsorber to heat the molecules and alumina to desorb the impurities such as water and carbon dioxide adsorbed by them; then the pipeline is switched and the adsorber is cold-blown with this cold dirty nitrogen to restore its adsorption function.

[0004] Installing two purification devices can solve the need for continuous adsorption of pre-cooled compressed air, but there are also problems. Specifically, during the switching process of the two purification devices, since the purification device in the standby state is at normal pressure, and the compression device in the working state is at positive pressure, direct switching will cause the compressed air entering the distillation tower to have pressure fluctuations, thereby directly having a negative impact on the low-temperature distillation process that is continuously carried out in the distillation tower. Although some companies in the prior art connect the outlet ends of the two purification devices with a pressure equalizing pipe and install a regulating valve on the pressure equalizing pipe. Before the two purification devices are officially switched, the gas discharged from the purification device in the working state is gradually introduced into the purification device in the standby state, so that the gas pressure of the purification device in the standby state is increased to the use state, and then the purification device in the use state and the purification device in the standby state are switched. The above operation can reduce the fluctuation amplitude of the compressed air entering the distillation tower, thereby reducing the fluctuation amplitude of the low-temperature distillation process in the distillation tower caused by the change of compressed air pressure. However, since the output power per minute of the upstream main air compressor is certain, the actual compressed air intake per minute that passes through the self-cleaning filter and enters the air precooling device is relatively stable. Under the actual working condition where the compressed air intake per minute is relatively stable, the gas discharged from the purification device in the working state is gradually introduced into the purification device in the standby state through the use of an equalizing pipe, so that the gas pressure of the purification device in the standby state is increased to the use state. Although the fluctuation amplitude of the compressed air can be reduced, the fluctuation period of the compressed air will be increased, which will also affect the low-temperature distillation process of the distillation tower. Therefore, in the switching process of the two purification devices, both the fluctuation amplitude of the compressed air and the fluctuation period of the compressed air are reduced, so that the downstream distillation tower is in a relatively stable low-temperature distillation state, so that the downstream distillation tower can stably output liquid products and gaseous products, thereby improving the product qualification rate, which is worthy of improvement, thereby improving the market competitiveness of the enterprise. Summary of the invention

[0005] In view of the deficiencies in the prior art, the utility model provides an air supply device for an air fractionation and distillation system which reduces the fluctuation amplitude and fluctuation period of compressed air during the switching of a purification device, so as to overcome the defects in the prior art.

[0006] The technical solution adopted by the utility model is: an air supply device of an air separation and distillation system, comprising a first compressed air delivery main pipe and a molecular sieve adsorption tank, wherein the number of the molecular sieve adsorption tanks is at least two, the inlet end of each molecular sieve adsorption tank is connected to the first compressed air delivery main pipe through the first delivery pipe, the outlet end of each molecular sieve adsorption tank is correspondingly provided with the inlet end of the second delivery pipe, the outlet ends of the plurality of second delivery pipes are provided with the inlet end of the second compressed air delivery main pipe, the outlet end of the second compressed air delivery main pipe is provided with the first compressed air delivery branch pipe, and the first compressed air delivery main pipe is provided with the first compressed air delivery branch pipe. The branch pipe is provided with the expansion end of the turbine expander, the first regulating valve, the first buffer tank, the post-machine heat exchanger and the boost end of the turbine expander in sequence along the direction away from the second compressed air delivery main pipe to the direction close to the second compressed air delivery main pipe. The inlet end of the first pressure regulating pipe is provided on the first compressed air delivery branch pipe between the first regulating valve and the first buffer tank, and the first pressure regulating pipe is provided with the second regulating valve. The outlet end of each molecular sieve adsorption tank and the outlet end of the first pressure regulating pipe are connected through the third delivery pipe, and each first delivery pipe, each second delivery pipe and each third delivery pipe are respectively provided with a first stop valve.

[0007] Preferably, the outlet end of the second compressed air delivery main pipe is also provided with the inlet end of the second compressed air delivery branch and the instrument air delivery main pipe, and the instrument air delivery main pipe is provided with a second buffer tank and a third regulating valve in sequence along the direction from close to the second compressed air delivery branch to far away from the second compressed air delivery branch, and the first compressed air delivery branch between the second compressed air delivery main pipe and the boosting end of the turbine expander, the instrument air delivery main pipe between the second buffer tank and the second compressed air delivery main pipe, and the second compressed air delivery branch are respectively provided with a fourth regulating valve, and the instrument air delivery main pipe between the fourth regulating valve installed on the instrument air delivery main pipe and the second buffer tank and the first compressed air delivery branch between the first regulating valve and the first buffer tank are provided with a second pressure regulating pipe, and the second pressure regulating pipe is provided with a fifth regulating valve.

[0008] Preferably, the first buffer tank and the second buffer tank are each provided with a first pressure sensor.

[0009] Preferably, one-way valves are respectively provided on the instrument gas delivery main pipe between the fourth regulating valve installed on the instrument gas delivery main pipe and the second pressure regulating pipe, and on the first compressed air delivery branch pipe between the first buffer tank and the post-machine heat exchanger.

[0010] Preferably, it also includes a desorbed gas discharge pipe, a fourth delivery pipe is arranged between the inlet end of each molecular sieve adsorption tank and the inlet end of the desorbed gas discharge pipe, a main heat exchanger is arranged on the first compressed air delivery branch pipe between the expansion end of the turbine expander and the first regulating valve and the second compressed air delivery branch pipe, a dirty nitrogen delivery pipe is arranged on the main heat exchanger, the inlet end of the desorbed gas delivery pipe and a sixth regulating valve are arranged in sequence along the direction from the main heat exchanger to the outlet end of the dirty nitrogen delivery pipe, the desorbed gas delivery pipe is arranged in sequence along the direction from close to the dirty nitrogen delivery pipe to far away from the dirty nitrogen delivery pipe, a seventh regulating valve and an electric heater are arranged in sequence along the direction from close to the dirty nitrogen delivery pipe to far away from the dirty nitrogen delivery pipe, a fifth delivery pipe is arranged at the outlet end of each molecular sieve adsorption tank and the outlet end of the desorbed gas delivery pipe, and a second stop valve is arranged on each fourth delivery pipe and each fifth delivery pipe.

[0011] Preferably, a first temperature sensor is provided on the desorption gas delivery pipe between the outlet end of the desorption gas delivery pipe and the electric heater, and a first online chromatograph and a second temperature sensor are provided on the desorption gas discharge pipe.

[0012] Preferably, a second pressure sensor is respectively provided on each third delivery pipe between the first stop valve installed on the third delivery pipe and the adjacent molecular sieve adsorption tank, and a second online chromatograph is provided on the second compressed air delivery main pipe.

[0013] The beneficial effects of the utility model are as follows: firstly, the utility model arranges a first buffer tank between the boosting end of the turbine expander and the main heat exchanger, so that the first buffer tank can be used to buffer the compressed air pressurized by the boosting end of the turbine expander and serve as a high-pressure gas source, and the first regulating valve is used to regulate the compressed air passing therethrough and send it to the main heat exchanger and then to the expansion end of the turbine expander for expansion and cooling, and finally to the upper tower as one of the distillation raw materials of the upper tower, and in the process of switching between the molecular sieve adsorption tank in a standby state and the molecular sieve adsorption tank in a working state, part of the gas in the first buffer tank is used as a high-pressure gas source to regulate the molecular sieve adsorption tank in the standby state to a preset working pressure, and does not affect the flow rate of the compressed air regulated by the first regulating valve, thereby reducing the fluctuation amplitude and fluctuation period of the compressed air in the process of switching between the molecular sieve adsorption tank in a standby state and the molecular sieve adsorption tank in a working state, thereby reducing the influence on the distillation process in the distillation tower during the switching of the molecular sieve adsorption tank.

[0014] Secondly, a check valve is respectively provided on the instrument gas delivery main pipe between the fourth regulating valve installed on the instrument gas delivery main pipe and the second pressure regulating pipe, and on the first compressed air delivery branch pipe between the first buffer tank and the rear heat exchanger of the machine. When the check valve is installed, the compressed air stored in the first buffer tank and the compressed air stored in the second buffer tank will flow back when the vehicle is parked.

[0015] Finally, the utility model provides a first online chromatograph and a second temperature sensor on the desorption gas discharge pipe; installing the first online chromatograph facilitates feedback of component parameters, and installing the second temperature sensor facilitates feedback of temperature parameters.

[0016] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved work efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0018] like Figure 1As shown, an air supply device of an air separation and distillation system comprises a first compressed air delivery main pipe 1, a molecular sieve adsorption tank 2 and a distillation tower, wherein the molecular sieve adsorption tank 2 comprises an adsorption tank body and a zeolite molecular sieve layer arranged in the adsorption tank body, wherein the distillation tower comprises an upper tower 38, a main condensation heat exchanger 39 and a lower tower 40 from top to bottom, wherein at least two molecular sieve adsorption tanks 2 are used, wherein the inlet end of each molecular sieve adsorption tank 2 is connected to the first compressed air delivery main pipe 1 through a first delivery pipe 3, wherein the outlet end of each molecular sieve adsorption tank 2 is correspondingly provided with the inlet end of a second delivery pipe 4, wherein the outlet ends of a plurality of second delivery pipes 4 are provided with the inlet end of a second compressed air delivery main pipe 5, and the outlet end of the second compressed air delivery main pipe 5 is provided with a The first compressed air delivery branch pipe 6 is provided with the expansion end of the turbine expander 7, the first regulating valve 8, the first buffer tank 9, the post-machine heat exchanger 10 and the boost end of the turbine expander 7 in sequence along the direction away from the second compressed air delivery main pipe 5 to the direction close to the second compressed air delivery main pipe 5. The inlet end of the first pressure regulating pipe 11 is provided on the first compressed air delivery branch pipe 6 between the first regulating valve 8 and the first buffer tank 9, and the first pressure regulating pipe 11 is provided with a second regulating valve 12. The outlet end of each molecular sieve adsorption tank 2 and the outlet end of the first pressure regulating pipe 11 are connected through the third delivery pipe 13, and each first delivery pipe 3, each second delivery pipe 4 and each third delivery pipe 13 are respectively provided with a first stop valve 14. The outlet end of the second compressed air delivery main pipe 5 is also provided with the inlet end of the second compressed air delivery branch pipe 15 and the instrument air delivery main pipe 16. The instrument air delivery main pipe 16 is provided with a second buffer tank 17 and a third regulating valve 18 in sequence along the direction from close to the second compressed air delivery branch pipe 15 to far away from the second compressed air delivery branch pipe 15. The first compressed air delivery branch pipe 6 between the second compressed air delivery main pipe 5 and the boosting end of the turbine expander 7, the instrument air delivery main pipe 16 between the second buffer tank 17 and the second compressed air delivery main pipe 5 and the second compressed air delivery branch pipe 15 are respectively provided with a fourth regulating valve 19. A second pressure regulating pipe 20 is provided on the instrument air delivery main pipe 16 between the fourth regulating valve 19 installed on the instrument air delivery main pipe 16 and the second buffer tank 17, and on the first compressed air delivery branch pipe 6 between the first regulating valve 8 and the first buffer tank 9, and a fifth regulating valve 21 is provided on the second pressure regulating pipe 20. The instrument gas delivery main pipe 16 between the fourth regulating valve 19 installed on the instrument gas delivery main pipe 16 and the second pressure regulating pipe 20 and the first compressed air delivery branch pipe 6 between the first buffer tank 9 and the after-machine heat exchanger 10 are respectively provided with a check valve 23. The first compressed air delivery branch pipe 6 is connected to the upper tower 38, and the second compressed air delivery branch pipe 15 is connected to the lower tower 40.

[0019] During an emergency trip of the air separation system, the compressed air stored in the second buffer tank 17 can still be delivered to the corresponding instrument gas receiving unit through the instrument gas delivery main pipe 16, so that the corresponding unit can be in a stopped state. When the compressed air stored in the second buffer tank 17 is insufficient, the first buffer tank 9 can be used as a high-pressure gas source for the second buffer tank 17 to continuously supply gas to the second buffer tank 17, so that the corresponding unit can complete the transition from the start-up state to the stop state.

[0020] Each third delivery pipe 13 is provided with a second pressure sensor 36, and the second compressed air delivery main pipe 5 is provided with a second online chromatograph 37. The first buffer tank 9 and the second buffer tank 17 are provided with a first pressure sensor 22 and a pressure relief valve 42. The first pressure sensor 22 is installed to facilitate the feedback of pressure parameters.

[0021] In addition, the product also includes a desorbed gas discharge pipe 24, a fourth delivery pipe 25 is arranged between the inlet end of each molecular sieve adsorption tank 2 and the inlet end of the desorbed gas discharge pipe 24, a main heat exchanger 26 is arranged on the first compressed air delivery branch pipe 6 between the expansion end of the turbine expander 7 and the first regulating valve 8 and the second compressed air delivery branch pipe 15, and a dirty nitrogen delivery pipe 27 is arranged on the main heat exchanger 26 and the upper tower 38. The inlet end of the desorbed gas delivery pipe 28 and the sixth regulating valve 29 are arranged in sequence on the dirty nitrogen delivery pipe 27 along the direction from the main heat exchanger 26 to the outlet end of the dirty nitrogen delivery pipe 27, and the desorbed gas delivery pipe 28 is arranged in sequence along the direction from close to the dirty nitrogen delivery pipe 27 to far away from the dirty nitrogen delivery pipe 27. The seventh regulating valve 30 and the electric heater 31 are arranged in sequence on the desorbed gas delivery pipe 28, and the outlet end of each molecular sieve adsorption tank 2 and the outlet end of the desorbed gas delivery pipe 28 are respectively provided with a fifth delivery pipe 32, and each fourth delivery pipe 25 and each fifth delivery pipe 32 are respectively provided with a second stop valve 33. A first temperature sensor 34 is provided on the desorption gas delivery pipe 28 between the outlet end of the desorption gas delivery pipe 28 and the electric heater 31 , and a first online chromatograph 35 and a second temperature sensor 41 are provided on the desorption gas discharge pipe 24 .

[0022] The usage of this product is as follows: Figure 1 As shown, the following steps are included:

[0023] S1, the first compressed air delivery main pipe 1 receives the compressed air delivered by the upstream precooling system and delivers it to the molecular sieve adsorption tank 2 in working state to remove water vapor and carbon dioxide, and then delivers it to the second compressed air delivery main pipe 5 and then is divided into three parts. The first part of the compressed air after purification is delivered to the instrument gas delivery main pipe 16, and then the second buffer tank 17 buffers it, and then the opening of the third regulating valve 18 is adjusted to adjust the pressure of the instrument gas delivered to the outside from the outlet of the instrument gas delivery main pipe 16; the second part of the compressed air after purification is delivered to the second compressed air delivery branch pipe 15, enters one of the heat source channels of the main heat exchanger 26, and then is sent to the cold source channel of the main heat exchanger 26 for heat exchange. The lower tower 40 serves as the distillation raw material of the lower tower 40; the third part of the purified compressed air is delivered to the first compressed air delivery branch pipe 6, pressurized by the boosting end of the turbine expander 7, and delivered to the heat source channel of the post-machine heat exchanger 10 and continuously delivered to the cold source medium of the cold source channel of the post-machine heat exchanger 10 for countercurrent heat exchange, and then delivered to the first buffer tank 9 for buffering, and then sent to another heat source channel of the main heat exchanger 26 after the flow and pressure are adjusted by the first regulating valve 8, and then sent to the cold source entering the main heat exchanger 26 for countercurrent heat exchange, and then discharged from the high temperature area of ​​the main heat exchanger 26 and sent to the expansion end of the turbine expander 7 for expansion and cooling, and finally sent to the upper tower 38 as one of the distillation raw materials of the upper tower 38.

[0024] S2. When the molecular sieve adsorption tank 2 in the working state runs for a preset time or the value fed back by the second online chromatograph 37 continuously deviates from the normal range, it is necessary to switch the molecular sieve adsorption tank 2 in the standby state and the molecular sieve adsorption tank 2 in the working state; specifically, first, open the second regulating valve 12 and the first stop valve 14 on the second delivery pipe 4 connected to the molecular sieve adsorption tank 2 in the standby state, at this time, part of the gas in the first buffer tank 9 is sequentially delivered to the molecular sieve adsorption tank 2 in the standby state through the first pressure regulating pipe 11 and the third delivery pipe 13 connected to the molecular sieve adsorption tank 2 in the standby state, when the second pressure sensor 36 installed on the third delivery pipe 13 connected to the molecular sieve adsorption tank 2 in the standby state reaches the preset range, close the second regulating valve 12 and the first stop valve 14 on the second delivery pipe 4 connected to the molecular sieve adsorption tank 2 in the standby state. Then, close the first stop valve 14 on the first delivery pipe 3 connected to the molecular sieve adsorption tank 2 in working state and the first stop valve 14 on the second delivery pipe 4 connected to the molecular sieve adsorption tank 2 in working state, and open the first stop valve 14 on the first delivery pipe 3 connected to the molecular sieve adsorption tank 2 in standby state and the first stop valve 14 on the second delivery pipe 4 connected to the molecular sieve adsorption tank 2 in standby state at the same time; the switching between the molecular sieve adsorption tank 2 in standby state and the molecular sieve adsorption tank 2 in working state is completed, at this time, the molecular sieve adsorption tank 2 originally in standby state is now in working state, and the molecular sieve adsorption tank 2 originally in working state is now in the molecular sieve adsorption tank 2 to be desorbed state.

[0025] S3. The molecular sieve adsorption tank 2 in the state to be desorbed needs to be desorbed to restore the adsorption capacity, so as to be converted into the molecular sieve adsorption tank 2 in the standby state, which specifically includes: first, the dirty nitrogen gas delivered to the dirty nitrogen gas delivery pipe 27 by the upper tower 38 passes through one of the cold source channels of the main heat exchanger 26 and the heat source continuously delivered to the main heat exchanger 26 for countercurrent heat exchange, and then continues to move along the dirty nitrogen gas delivery pipe 27, and then is divided into two parts. The first part of the dirty nitrogen gas continues to move along the dirty nitrogen gas delivery pipe 27 to the downstream target user; the second part of the dirty nitrogen gas is sent to the desorption gas delivery pipe 28, is heated by the electric heater 31, and forms a high-temperature desorbed gas, which is continuously sent to the molecular sieve adsorption tank 2 in the state to be desorbed after the temperature is fed back by the first temperature sensor 34, and the adsorption filler in the molecular sieve adsorption tank 2 in the state to be desorbed is subjected to high-temperature desorption, and the analytical gas formed after desorption is Then, the nitrogen gas is discharged outwardly through the fourth delivery pipe 25 connected to the molecular sieve adsorption tank 2 in the desorption state and the outlet end of the desorption gas discharge pipe 24 in turn. When the first online chromatograph 35 is continuously and stably within the preset range, the electric heater 31 is turned off. At this time, the desorption gas delivery pipe 28 gradually and continuously delivers low-temperature polluted nitrogen gas as replacement gas into the molecular sieve adsorption tank 2 in the state to be desorbed. When the second temperature sensor 41 is always within the preset range and maintained for a preset time, the seventh regulating valve 30, the second stop valve 33 on the fifth delivery pipe 32 connected to the molecular sieve adsorption tank 2 in the state to be desorbed, and the second stop valve 33 on the fourth delivery pipe 25 connected to the molecular sieve adsorption tank 2 in the state to be desorbed are closed, thereby completing the desorption treatment of the molecular sieve adsorption tank 2 in the state to be desorbed. At this time, the molecular sieve adsorption tank 2 originally in the state to be desorbed is now in the standby state.

[0026] Through this embodiment, it is achieved that by arranging the first buffer tank 9 between the boosting end of the turbine expander 7 and the main heat exchanger 26, the first buffer tank 9 can be used to buffer the compressed air after being pressurized by the boosting end of the turbine expander 7 and serve as a high-pressure gas source, and the first regulating valve 8 is used to regulate the compressed air passing through and send it to the main heat exchanger 26 and then send it to the expansion end of the turbine expander 7 for expansion and cooling, and finally send it to the upper tower 38 as one of the distillation raw materials of the upper tower 38, and in the process of switching between the molecular sieve adsorption tank 2 in the standby state and the molecular sieve adsorption tank 2 in the working state, part of the gas in the first buffer tank 9 is used as a high-pressure gas source to adjust the molecular sieve adsorption tank 2 in the standby state to a preset working pressure, and does not affect the flow rate of the compressed air regulated by the first regulating valve 8, thereby reducing the fluctuation amplitude and fluctuation period of the compressed air in the process of switching between the molecular sieve adsorption tank 2 in the standby state and the molecular sieve adsorption tank 2 in the working state, thereby reducing the impact of the distillation process in the distillation tower during the switching of the molecular sieve adsorption tank 2.

[0027] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. An air supply device for an air separation and distillation system, comprising a first compressed air delivery main pipe (1) and a molecular sieve adsorption tank (2), characterized in that: The number of the molecular sieve adsorption tanks (2) is at least two, the inlet end of each molecular sieve adsorption tank (2) is connected to the first compressed air delivery main pipe (1) via a first delivery pipe (3), the outlet end of each molecular sieve adsorption tank (2) is correspondingly provided with the inlet end of a second delivery pipe (4), the outlet ends of a plurality of second delivery pipes (4) are provided with the inlet ends of a second compressed air delivery main pipe (5), the outlet end of the second compressed air delivery main pipe (5) is provided with a first compressed air delivery branch pipe (6), and the first compressed air delivery branch pipe (6) is sequentially provided in a direction away from the second compressed air delivery main pipe (5) and close to the second compressed air delivery main pipe (5). There are an expansion end of a turbine expander (7), a first regulating valve (8), a first buffer tank (9), a post-machine heat exchanger (10) and a boost end of the turbine expander (7); an inlet end of a first pressure regulating pipe (11) is provided on a first compressed air delivery branch pipe (6) between the first regulating valve (8) and the first buffer tank (9); a second regulating valve (12) is provided on the first pressure regulating pipe (11); an outlet end of each molecular sieve adsorption tank (2) and an outlet end of the first pressure regulating pipe (11) are connected via a third delivery pipe (13); and a first stop valve (14) is provided on each first delivery pipe (3), each second delivery pipe (4) and each third delivery pipe (13).

2. The gas supply device of the air separation and distillation system according to claim 1, characterized in that: The outlet end of the second compressed air delivery main pipe (5) is also provided with the inlet end of the second compressed air delivery branch pipe (15) and the instrument air delivery main pipe (16). The instrument air delivery main pipe (16) is provided with a second buffer tank (17) and a third regulating valve (18) in sequence along the direction from close to the second compressed air delivery branch pipe (15) to far away from the second compressed air delivery branch pipe (15). The first compressed air delivery branch pipe (6), the second buffer tank (17) and the third regulating valve (18) between the second compressed air delivery main pipe (5) and the boost end of the turbine expander (7) are A fourth regulating valve (19) is provided on the instrument air delivery main pipe (16) and the second compressed air delivery branch pipe (15) between the first regulating valve (8) and the second compressed air delivery main pipe (5), respectively; a second pressure regulating pipe (20) is provided on the instrument air delivery main pipe (16) between the fourth regulating valve (19) installed on the instrument air delivery main pipe (16) and the second buffer tank (17) and the first compressed air delivery branch pipe (6) between the first regulating valve (8) and the first buffer tank (9), and a fifth regulating valve (21) is provided on the second pressure regulating pipe (20).

3. The gas supply device of the air separation and distillation system according to claim 2, characterized in that: The first buffer tank (9) and the second buffer tank (17) are each provided with a first pressure sensor (22).

4. The gas supply device of the air separation and distillation system according to claim 2, characterized in that: The instrument gas delivery main pipe (16) between the fourth regulating valve (19) installed on the instrument gas delivery main pipe (16) and the second pressure regulating pipe (20) and the first compressed air delivery branch pipe (6) between the first buffer tank (9) and the post-machine heat exchanger (10) are respectively provided with a one-way valve (23).

5. The gas supply device of the air separation and distillation system according to claim 2, characterized in that: The desorbed gas delivery pipe (24) is also included. A fourth delivery pipe (25) is provided between the inlet end of each molecular sieve adsorption tank (2) and the inlet end of the desorbed gas delivery pipe (24). A main heat exchanger (26) is provided on the first compressed air delivery branch pipe (6) and the second compressed air delivery branch pipe (15) between the expansion end of the turbine expander (7) and the first regulating valve (8). A dirty nitrogen delivery pipe (27) is provided on the main heat exchanger (26). The dirty nitrogen delivery pipe (27) extends along the main heat exchanger (26) to the outlet of the dirty nitrogen delivery pipe (27). The inlet end of the desorption gas delivery pipe (28) and the sixth regulating valve (29) are sequentially arranged in the direction of the outlet end; the desorption gas delivery pipe (28) is sequentially arranged with a seventh regulating valve (30) and an electric heater (31) along the direction from close to the dirty nitrogen gas delivery pipe (27) to far away from the dirty nitrogen gas delivery pipe (27); the outlet end of each molecular sieve adsorption tank (2) and the outlet end of the desorption gas delivery pipe (28) are respectively arranged with a fifth delivery pipe (32); and each fourth delivery pipe (25) and each fifth delivery pipe (32) are respectively arranged with a second stop valve (33).

6. The gas supply device of the air separation and distillation system according to claim 5, characterized in that: A first temperature sensor (34) is provided on the desorption gas delivery pipe (28) between the outlet end of the desorption gas delivery pipe (28) and the electric heater (31), and a first online chromatograph (35) and a second temperature sensor (41) are provided on the desorption gas discharge pipe (24).

7. The gas supply device of the air separation and distillation system according to claim 1, characterized in that: A second pressure sensor (36) is provided on each third delivery pipe (13) between the first stop valve (14) installed on the third delivery pipe (13) and the adjacent molecular sieve adsorption tank (2), and a second online chromatograph (37) is provided on the second compressed air delivery main pipe (5).

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