Turbo-driven pressure swing adsorption gas separation system and separation method

Abstract

The present invention provides a turbine-driven pressure swing adsorption gas separation system and a separation method, which includes a blower, an adsorption tower, a vacuum pump, and a product gas unit. The adsorption towers are provided in three and are arranged in parallel. It further includes a raw material gas unit, which is provided in three, is simultaneously connected to the outlet of the blower and the inlet of the vacuum pump, and is respectively connected to the inlets of the three adsorption towers for transmitting gas; a first turbine, which is connected to the blower; a second turbine, which is connected to the vacuum pump; and a control unit, which is used to drive the raw material gas unit, the first turbine, the second turbine, and the product gas unit to open and close, so as to alternately realize the charging, venting, or vacuum pumping of the three adsorption towers. The present invention has the effect of improving the problems in the prior art that the centrifugal dynamic equipment driven by an electric motor has a high system cost, and at the same time, in the traditional two-tower process system, the blower and the vacuum pump have ineffective working time, resulting in an increase in system power consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure swing adsorption gas separation, and particularly to a pressure swing adsorption gas separation system and a separation method driven by a turbine. Background Art

[0002] A pressure swing adsorption gas separation system is a gas separation system composed of a pressurization device, an adsorption tower with an adsorbent, a vacuum pump, and a product gas buffer tank, etc., which has the function of separating a certain component in the mixed gas (for example: oxygen in the air) and storing it in the product gas buffer tank for transmission to a downstream system for further processing or use.

[0003] In the prior art, on the one hand, the dynamic equipment (including blowers, vacuum pumps, etc.) used in the pressure swing adsorption gas separation system is driven by an electric motor, and the dynamic equipment is divided into two types: positive displacement (roots pump, piston pump, water ring pump) and centrifugal. Among them, the positive displacement type has been gradually phased out due to its low efficiency, large floor space, high noise, etc., while the centrifugal dynamic equipment faces the problem of reducing energy consumption by performing pulse speed regulation on the unit. However, for the existing centrifugal dynamic equipment driven by an electric motor, if pulse speed regulation is to be performed, the technical threshold and processing technology requirements of the unit will be very high (for example: the electric motor needs to be actively controlled by a frequency converter to ensure that after the valve group in the system performs an opening / closing action, the rotational speed of the blower and / or the vacuum pump changes accordingly. The components of the frequency converter are complex and prone to failure, and at the same time, the cost is high. The short replacement cycle of these components will inevitably cause a straight-line increase in cost), which will instead make the system cost high.

[0004] On the other hand, in the traditional two-tower (with two adsorption towers) process, when applying centrifugal units, there is always a period of time when the unit is directly open to the air, resulting in ineffective working time for the blower and the vacuum pump. The ineffective consumption during this period also increases the average consumption of the system. Specifically, it is shown that when an adsorption tower has just completed blowing, the tower pressure is positive relative to the environment at this time. At this time, directly evacuating or making the vacuum pump have a large pumping load. The common practice is to first relieve the pressure of the tower to atmospheric pressure (vent) through a valve, and then connect the vacuum pump to evacuate. During this pressure relief process, in the two-tower process, the vacuum pump is in an ineffective working time; similarly, when an adsorption tower has just been evacuated and its negative pressure is relatively high, directly connecting the blower at this time will also cause a large load on the blower. The common practice is to use the same valve for pre-inflation, and then connect the blower to blow after it reaches atmospheric pressure. Then the blower is in an ineffective working time during the pre-inflation period. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a turbine-driven pressure swing adsorption gas separation system and separation method, which can improve the problems existing in the centrifugal dynamic equipment driven by an electric motor in the prior art, such as high system cost. At the same time, in the traditional two-tower process system, the blower and the vacuum pump have ineffective working time, resulting in an increase in system power consumption.

[0006] On the one hand, according to an embodiment of the present invention, a turbine-driven pressure swing adsorption gas separation system includes a blower, an adsorption tower indirectly connected to the outlet of the blower, a vacuum pump with an inlet indirectly connected to the adsorption tower, and a product gas unit connected to the outlet of the adsorption tower. The adsorption towers are provided in three and are arranged in parallel; it also includes a raw material gas unit, which is provided in three, is simultaneously connected to the outlet of the blower and the inlet of the vacuum pump, and is respectively connected to the inlets of the three adsorption towers for transmitting gas; a first turbine, connected to the blower; a second turbine, connected to the vacuum pump; and a control unit, used to drive the raw material gas unit, the first turbine, the second turbine, and the product gas unit to open and close, so as to alternately realize the inflation, evacuation, or vacuum pumping of the three adsorption towers.

[0007] Preferably, the raw material gas unit includes: an inflation valve, which is simultaneously connected to the outlet of the blower and the inlet of the adsorption tower to realize the inflation of the adsorption tower; an evacuation valve, which is simultaneously connected to the inlet of the vacuum pump and the inlet of the adsorption tower and is closer to the adsorption tower than the inflation valve to realize the vacuum pumping of the adsorption tower; a vent valve, which is connected to the inlet of the adsorption tower and is closer to the adsorption tower than the evacuation valve to realize the venting of the adsorption tower and balance the internal and external pressures of the adsorption tower.

[0008] Preferably, three first exhaust valves are provided, which are respectively connected to the outlets of the three adsorption towers; a buffer tank, whose inlet is simultaneously connected to the three first exhaust valves.

[0009] Preferably, three second exhaust valves are provided, which are respectively connected to the outlets of the three adsorption towers and are closer to the adsorption tower than the first exhaust valves; a pressure equalizing tower, whose inlet end is simultaneously connected to the three second exhaust valves.

[0010] Preferably, the buffer tank and the pressure equalizing tower are connected, and a main valve is provided on the connecting pipeline, and the main valve is closer to the buffer tank than the second exhaust valve.

[0011] Preferably, an intake air filter box is connected to the inlet of the blower, and an exhaust muffler is connected to the outlet of the vacuum pump.

[0012] Preferably, a first vent valve is connected to the outlet of the blower, and the first vent valve is closer to the blower than the inflation valve.

[0013] Preferably, an air inlet of the vacuum pump is communicated with a second evacuation valve, and the second evacuation valve is closer to the vacuum pump than the evacuation valve.

[0014] On the other hand, according to an embodiment of the present invention, there is also provided a pressure swing adsorption gas separation method driven by a turbine, which includes the following steps:

[0015] S1. Start the blower to inflate the first adsorption tower and generate product gas; start the vacuum pump to evacuate the second adsorption tower; and evacuate the third adsorption tower.

[0016] S2. Keep the first adsorption tower in the state of inflating and generating product gas, evacuate the second adsorption tower, and evacuate the third adsorption tower.

[0017] S3. Inflate the second adsorption tower and generate product gas, start to evacuate the first adsorption tower, and continuously evacuate the third adsorption tower.

[0018] S4. Keep the second adsorption tower in the state of inflating and generating product gas, evacuate the first adsorption tower, and start to evacuate the third adsorption tower.

[0019] S5. Inflate the third adsorption tower and generate product gas, continuously evacuate the first adsorption tower, and start to evacuate the second adsorption tower.

[0020] S6. Keep the third adsorption tower in the state of inflating and generating product gas, start to evacuate the first adsorption tower, and start to evacuate the second adsorption tower.

[0021] S7. Repeat steps S1 - S6.

[0022] Preferably, when starting the blower, first open the first evacuation valve for bypass evacuation; when closing the vacuum pump, first open the second evacuation valve for evacuating the vacuum pump.

[0023] In summary, the present invention includes at least one of the following beneficial technical effects:

[0024] By arranging three adsorption towers in parallel and connecting a blower and a vacuum pump to the inlets of the three adsorption towers simultaneously, during the separation process, the blower is used to blow air into the three adsorption towers in sequence, and at the same time, the vacuum pump is used to evacuate the three adsorption towers in sequence, so that the three adsorption towers are in different working (pressure) states, forming states of inflation, venting or vacuum pumping. In the whole process, the adsorption towers, the blower and the vacuum pump are rotated without gaps. Unlike the two-tower process, the blower and the vacuum pump no longer have ineffective working time, and the efficiency of the centrifugal unit is fully utilized, thus improving the problem in the traditional two-tower process system that the blower and the vacuum pump have ineffective working time, resulting in an increase in system power consumption. Moreover, both the blower and the vacuum pump are connected to a turbine, and the turbine is used to drive the blower and the vacuum pump to operate. The turbine and the blower / vacuum pump will form a common working line. When the driving gas source parameters of the turbine remain unchanged (i.e., the expansion ratio), the change in the rotational speed will not cause too much change in its power. When the load of the blower / vacuum pump changes due to the change in the system pressure in the system, since the power / torque of the turbine is relatively constant, the rotational speed of the unit will automatically decrease or increase, realizing the adaptive operation of the unit without the need for frequent pulse-type active speed regulation of the unit. Correspondingly, there is no need for the operation of replacing the frequency converter as required in the prior art, thus improving the problem of high system cost of the centrifugal dynamic equipment driven by an electric motor in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 FIG. is a three-tower pressure swing adsorption system diagram applying a turbine drive unit according to an embodiment of the present invention;

[0026] Figure 2 FIG. is a power-pressure characteristic curve diagram of the turbine at different rotational speeds according to an embodiment of the present invention;

[0027] Figure 3 FIG. is a curve diagram of the common working line of the turbine - blower / vacuum pump according to an embodiment of the present invention;

[0028] Figure 4 FIG. is a timing control sequence diagram according to an embodiment of the present invention.

[0029] In the above-mentioned drawings: 1. Adsorption tower; 2. Inflation valve; 3. Evacuation valve; 4. Venting valve; 5. Blower; 51. Inlet air filter box; 52. First venting valve; 6. Vacuum pump; 61. Exhaust muffler; 62. Second venting valve; 7. First turbine; 71. Second turbine; 8. First exhaust valve; 81. Buffer tank; 9. Second exhaust valve; 91. Pressure equalizing tower; 92. Main valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following is a further description of the present invention in conjunction with the attached Figures 1-4 drawings.

[0031] Refer toFigures 1 to 3 On the one hand, an embodiment of the present invention provides a pressure swing adsorption gas separation system using a turbine to drive a moving device, which includes an adsorption tower 1, a raw material gas unit, a blower 5, a vacuum pump 6, a product gas unit, and a control unit; three adsorption towers 1 are arranged in parallel.

[0032] The raw material gas unit is set to three, which are respectively connected to the inlet ports of the three adsorption towers 1. In the figure, it is shown as being connected to the lower end of the adsorption tower 1. The raw material gas unit includes an inflation valve 2, a evacuation valve 3, and a vent valve 4, all of which are connected to the inlet end of the adsorption tower 1. Moreover, the inflation valve 2 is also connected to the outlet end of the blower 5 to inflate the adsorption tower 1 through the blower 5; the evacuation valve 3 is connected to the inlet end of the vacuum pump 6 and is closer to the adsorption tower 1 than the inflation valve 2 to evacuate the adsorption tower 1 through the vacuum pump 6; the vent valve 4 is closer to the adsorption tower 1 than the evacuation valve 3 and is connected to the atmosphere to complete the venting operation of the adsorption tower 1.

[0033] It should be noted that in the present invention, after inflation, the air pressure in the adsorption tower 1 is higher than the external air pressure, after venting, the air pressure in the adsorption tower 1 is equal to the external air pressure, and after evacuation, the air pressure in the adsorption tower 1 is lower than the external air pressure.

[0034] The outlet end of the blower 5 is connected to the inflation valve 2 of the raw material gas unit to inflate the adsorption tower 1 through the inflation valve 2; the blower 5 is connected to a first turbine 7 to drive the blower 5 to operate through the first turbine 7. An intake air filter box 51 is connected to the inlet end of the blower 5 to filter the sucked-in gas. Moreover, a first vent valve 52 is also connected to the outlet end of the blower 5. The first vent valve 52 is closer to the blower 5 than the raw material gas unit; before starting the blower 5, bypass venting is first performed through the first vent valve 52 to ensure the operation effect of the system and the gas treatment effect.

[0035] The inlet end of the vacuum pump 6 is connected to the evacuation valve 3 of the raw material gas unit to evacuate any one of the adsorption towers 1 through the evacuation valve 3; the vacuum pump 6 is connected to a second turbine 71 to drive the vacuum pump 6 to operate through the second turbine 71. An exhaust muffler 61 is connected to the outlet end of the vacuum pump 6 to reduce the noise caused by discharging gas. A second vent valve 62 is also connected to the inlet end of the vacuum pump 6. The second vent valve 62 is closer to the vacuum pump 6 than the raw material gas unit; when the entire system is shut down, the second vent valve 62 is opened to ensure that enough gas passes through the vacuum pump 6 to prevent the phenomenon of pump surge in the vacuum pump 6 and ensure the service life.

[0036] The product gas unit is simultaneously connected to the outlet ports of three adsorption towers 1. In the figure, it is shown as being connected to the upper ends of the adsorption towers 1, and it includes three first exhaust valves 8 and a buffer tank 81; the three first exhaust valves 8 are respectively connected to the upper ends of the three adsorption towers 1, that is, respectively connected to the upper ends of the first adsorption tower 1, the second adsorption tower 1, and the third adsorption tower 1; the buffer tank 81 is simultaneously connected to the three first exhaust valves 8, so as to receive the product gas generated by any one of the adsorption towers 1 by opening the first exhaust valves 8 for subsequent utilization and production work, and at the same time, to change the air pressure in the corresponding adsorption tower 1.

[0037] The control unit is simultaneously connected to the raw material gas unit (charging valve 2, evacuation valve 3, and vent valve 4), the first turbine 7, the second turbine 71, and the product gas unit (first exhaust valve 8) to drive the opening and closing (starting and closing) of the raw material gas unit, the first turbine 7, the second turbine 71, and the product gas unit. In the embodiment of the present invention, the control unit can be a general-purpose processor, including a central processing unit, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiment of the present invention. The general-purpose processor can be a microprocessor or any conventional processor, etc.

[0038] When gas separation is carried out, in the embodiment of the present invention, the control unit controls the first turbine 7 and the second turbine 71 to start. The first turbine 7 and the second turbine 71 drive the blowers 5 / vacuum pumps 6 directly connected thereto to operate. The first turbine 7 and the second turbine 71 respectively form a common working line with the blowers 5 / vacuum pumps 6. At this time, Figure 2 it can be seen that when the power / torque characteristics of the first turbine 7 and the second turbine 71 do not change the driving gas source parameters (i.e., the expansion ratio), the change in speed will not cause too much change in their power (point A - point B - point C). This enables the blowers 5 / vacuum pumps 6 to automatically reduce or increase the speed of the unit when the load changes due to the change in the system pressure in the pressure swing adsorption gas separation system, because the power / torque of the first turbine 7 and the second turbine 71 is relatively constant, thus realizing the adaptive operation of the unit and forming an adaptive common working line (refer to Figure 3 ), and there is no need to perform frequent pulse-type active speed regulation on the unit, thereby improving the problem in the prior art that the centrifugal dynamic equipment driven by an electric motor needs to frequently replace parts, resulting in an expensive system cost.

[0039] When separating gas, by changing the opening and closing states of the charging valve 2, evacuation valve 3, and vent valve 4 respectively connected to the three adsorption towers 1, the three adsorption towers 1 present different air pressure states in the same time period, so as to ensure that the blower 5 and the vacuum pump 6 are always running and affect the air pressure states of the three adsorption towers 1, ensuring that the tower group composed of the three adsorption towers 1 can generate product gas at any time, thereby improving the problem that in the traditional two-tower process system, the blower 5 and the vacuum pump 6 have ineffective working time, resulting in an increase in system power consumption. This will be described in detail in the following method.

[0040] Among them, the product gas unit further includes three second exhaust valves 9 and a pressure equalizing tower 91; the three second exhaust valves 9 are respectively connected to the air outlets of the three adsorption towers 1, and the second exhaust valve 9 is closer to the adsorption tower 1 than the first exhaust valve 8; the pressure equalizing tower 91 is simultaneously connected to the three second exhaust valves 9 to perform a certain degree of pressure equalizing operation on the adsorption tower 1, accelerating the pressure change process of the adsorption tower 1. And the buffer tank 81 and the pressure equalizing tower 91 are connected, and a main valve 92 is provided on the connected pipeline. The main valve 92 is closer to the buffer tank 81 than the second exhaust valve 9 to realize the intercommunication between the buffer tank 81 and the pressure equalizing tower 91, transmit the product gas entering the pressure equalizing tower 91 into the buffer tank 81, and make full use of it.

[0041] As another embodiment, adjustable nozzles are provided on both the first turbine 7 and the second turbine 71, so that the turbine has a large variable power characteristic, which is matched with the operating speed, so that the centrifugal blower 5 / vacuum pump 6 works near the highest efficiency line, forming a common working line of the turbine - blower / vacuum pump with adjustable nozzles.

[0042] Refer to Figure 4 On the other hand, the embodiment of the present invention / utility model also proposes a separation method applied to a pressure swing adsorption gas separation system driven by a turbine, which includes the following steps:

[0043] S1. Charge the first adsorption tower 1 and generate product gas:

[0044] First, open the first evacuation valve 52 for bypass evacuation, then start the blower 5, and charge the first adsorption tower 1 and the third adsorption tower 1 through the blower 5 and the charging valve 2, so that the first adsorption tower 1 generates product gas and transmits it to the buffer tank 81 through the first exhaust valve 8, and the charging time is 6 - 10 seconds; at the same time, start the vacuum pump 6, and evacuate the second adsorption tower 1 through the evacuation valve 3, and the evacuation time is 8 - 12 seconds; at this time, the third adsorption tower 1 completes blowing and is evacuated through the vent valve 4, and the evacuation time is 1 - 3 seconds;

[0045] S2. Keep the first adsorption tower 1 operating with the relevant raw gas unit (charging valve 2) and product gas unit (first exhaust valve 8, buffer tank 81):

[0046] The second adsorption tower 1 finishes evacuating the air, and starts to vent the air from the second adsorption tower 1 through the vent valve 4 for a venting time of 1 - 3 seconds; meanwhile, the third adsorption tower 1 finishes venting the air, and uses the vacuum pump 6 and the evacuation valve 3 to evacuate the air from the third adsorption tower 1 for an evacuation time of 8 - 12 seconds;

[0047] S3. Inflate the second adsorption tower 1 and generate product gas:

[0048] The first adsorption tower 1 finishes blowing air, cuts off the connection between the first adsorption tower 1 and the buffer tank 81 by closing the first exhaust valve 8, and starts to vent the air through the vent valve 4 for a venting time of 1 - 3 seconds; meanwhile, starts to blow air into the second adsorption tower 1 through the blower 5 and the inflation valve 2 for a blowing time of 8 - 12 seconds. The second adsorption tower 1 generates product gas and transmits it to the buffer tank 81 through the first exhaust valve 8 for a gas transmission time of 8 - 12 seconds; the third adsorption tower 1 continues to evacuate the air;

[0049] S4. Keep the second adsorption tower 1 operating with the relevant raw gas unit (inflation valve 2) and product gas unit (first exhaust valve 8, buffer tank 81):

[0050] The first adsorption tower 1 finishes venting the air and starts to evacuate the air through the vacuum pump 6 and the evacuation valve 3 for an evacuation time of 8 - 12 seconds; meanwhile, the third adsorption tower 1 finishes evacuating the air, and starts to vent the air from the third adsorption tower 1 through the vent valve 4 for a venting time of 1 - 3 seconds;

[0051] S5. Inflate the third adsorption tower 1 and generate product gas:

[0052] The first adsorption tower 1 continues to evacuate the air; meanwhile, cuts off the connection between the second adsorption tower 1 and the buffer tank 81 by closing the first exhaust valve 8, and starts to vent the air through the vent valve 4 for a venting time of 1 - 3 seconds; the third adsorption tower 1 finishes venting the air, and meanwhile starts to blow air into the third adsorption tower 1 through the blower 5 and the inflation valve 2. The third adsorption tower 1 generates product gas and transmits it to the buffer tank 81 through the first exhaust valve 8 for a gas transmission time of 8 - 12 seconds;

[0053] S6. Keep the third adsorption tower 1 operating with the relevant raw gas unit (inflation valve 2) and product gas unit (first exhaust valve 8, buffer tank 81):

[0054] The first adsorption tower 1 finishes evacuating the air and starts to vent the air through the vent valve 4 for a venting time of 1 - 3 seconds; the second adsorption tower 1 finishes venting the air and starts to evacuate the air through the vacuum pump 6 and the evacuation valve 3 for an evacuation time of 8 - 12 seconds;

[0055] S7. Repeat steps S1 - S6 to form a cycle period of the pressure swing adsorption system.

[0056] Through the above separation method, during the separation process, the blower 5 and the vacuum pump 6 are always in a working state, and the first adsorption tower 1 of the first set, the second adsorption tower 1 of the second set, and the third adsorption tower 1 of the third set are sequentially inflated or evacuated, so that the first adsorption tower 1 of the first set, the second adsorption tower 1 of the second set, the third adsorption tower 1 of the third set, the blower 5, and the vacuum pump 6 are used in rotation without gaps. The blower 5 and the vacuum pump 6 no longer have ineffective working time as in the two-tower process, thus improving the problem in the prior art that the blower 5 and the vacuum pump 6 have ineffective working time, resulting in an increase in system power consumption.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A turbine-driven pressure swing adsorption gas separation system, comprising a blower (5), an adsorption tower (1) indirectly connected to the outlet of the blower (5), a vacuum pump (6) with an inlet indirectly connected to the adsorption tower (1), and a product gas unit connected to the outlet of the adsorption tower (1), characterized in that: The adsorption towers (1) are provided in three and arranged in parallel; also include, The raw gas units, which are provided in three, are simultaneously connected to the outlet of the blower (5) and the inlet of the vacuum pump (6), and are respectively connected to the inlets of the three adsorption towers (1) for transmitting gas; The first turbine (7) is connected to the blower (5), and after the first turbine (7) starts, it drives the blower (5) to operate; The second turbine (71) is connected to the vacuum pump (6), and after the second turbine (71) starts, it drives the vacuum pump (6) to operate. Adjustable nozzles are provided on both the first turbine (7) and the second turbine (71); And a control unit for driving the raw gas unit, the first turbine (7), the second turbine (71), and the product gas unit to open and close, so as to alternately realize the inflation, evacuation, or vacuum pumping of the three adsorption towers (1).

2. The pressure swing adsorption gas separation system driven by a turbine according to claim 1, wherein The raw gas unit includes: The inflation valve (2) is simultaneously connected to the outlet of the blower (5) and the inlet of the adsorption tower (1) to realize the inflation of the adsorption tower (1); The evacuation valve (3) is simultaneously connected to the inlet of the vacuum pump (6) and the inlet of the adsorption tower (1), and is closer to the adsorption tower (1) than the inflation valve (2) to realize the vacuum pumping of the adsorption tower (1); The vent valve (4) is connected to the inlet of the adsorption tower (1), and is closer to the adsorption tower (1) than the evacuation valve (3) to realize the venting of the adsorption tower (1) and balance the air pressure inside and outside the adsorption tower (1).

3. The pressure swing adsorption gas separation system driven by a turbine according to claim 1, characterized in that, The product gas unit includes: The first exhaust valves (8) are provided in three and are respectively connected to the outlets of the three adsorption towers (1); The buffer tank (81) has its inlet simultaneously connected to the three first exhaust valves (8).

4. The pressure swing adsorption gas separation system driven by a turbine according to claim 3, wherein The product gas unit further includes: The second exhaust valves (9) are provided in three and are respectively connected to the outlets of the three adsorption towers (1), and are closer to the adsorption tower (1) than the first exhaust valves (8); The pressure equalizing tower (91) has its inlet end simultaneously connected to the three second exhaust valves (9).

5. The pressure swing adsorption gas separation system driven by a turbine according to claim 4, wherein: The buffer tank (81) and the pressure equalizing tower (91) are connected, and a main valve (92) is provided on the connecting pipeline. The main valve (92) is closer to the buffer tank (81) than the second exhaust valve (9).

6. The pressure swing adsorption gas separation system driven by a turbine according to claim 2, characterized in that: The inlet of the blower (5) is connected to an intake air filter box (51), and the outlet of the vacuum pump (6) is connected to an exhaust muffler (61).

7. The pressure swing adsorption gas separation system driven by a turbine according to claim 6, wherein: The outlet of the blower (5) is connected to a first vent valve (52), and the first vent valve (52) is closer to the blower (5) than the inflation valve (2).

8. The pressure swing adsorption gas separation system driven by a turbine according to claim 6, wherein: The inlet of the vacuum pump (6) is connected to a second vent valve (62), and the second vent valve (62) is closer to the vacuum pump (6) than the evacuation valve (3).

9. A separation method applied to a pressure swing adsorption gas separation system driven by a turbine as described in any one of claims 1-8, characterized in that, It includes the following steps: S1. Start the blower (5) to inflate the first adsorption tower (1) and generate product gas; start the vacuum pump (6) to evacuate the second adsorption tower (1); and vent the third adsorption tower (1); S2. Keep the first adsorption tower (1) in the state of inflating and generating product gas, vent the second adsorption tower (1), and evacuate the third adsorption tower (1); S3. Inflate the second adsorption tower (1) and generate product gas, start venting the first adsorption tower (1), and continuously evacuate the third adsorption tower (1); S4. Keep the second adsorption tower (1) inflated and generating product gas, evacuate the first adsorption tower (1), and start venting the third adsorption tower (1); S5. Inflate the third adsorption tower (1) and generate product gas, continuously evacuate the first adsorption tower (1), and start venting the second adsorption tower (1); S6. Keep the third adsorption tower (1) inflated and generating product gas, start venting the first adsorption tower (1), and start evacuating the second adsorption tower (1); S7. Repeat steps S1 - S6.

10. The separation method applied to a pressure swing adsorption gas separation system driven by a turbine according to claim 9, characterized in that: When starting the blower (5), first open the first vent valve (52) for bypass venting; when closing the vacuum pump (6), first open the second vent valve (62) for venting the vacuum pump (6).

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