Desorbed gas recovery system

Abstract

The utility model provides a kind of desorption gas recovery system, including first buffer tank, compressor, second buffer tank, gas outlet main pipe and air supplement pipe. Desorption gas inlet is provided on first buffer tank, and first buffer tank is communicated with the air inlet of compressor by first pipeline. Gas outlet main pipe is connected to the gas outlet of compressor, and air supplement pipe is communicated with the air inlet of compressor. Second buffer tank is communicated with the air inlet of compressor by second pipeline, and second buffer tank is communicated with the gas outlet of compressor by third pipeline. When the pressure of the air inlet of compressor is insufficient, the desorption gas stored in second buffer tank is used to supplement the pressure of the air inlet of compressor. When the desorption gas stored in second buffer tank still cannot supplement the pressure of the air inlet of compressor, external crude hydrogen is introduced through air supplement pipe to supplement, so as to reduce the evacuation of desorption gas and improve the utilization rate of desorption gas.

Description

Technical Field

[0001] This utility model relates to the field of desorbed gas recovery technology, and in particular to a desorbed gas recovery system. Background Technology

[0002] PSA hydrogen purification units generate desorption gas. To improve project economics, the industry practice is to recover and reuse this desorption gas. However, the desorption gas pressure is relatively low, and to meet the requirements of different operating conditions, it is usually pressurized and sent externally. In actual process flows, PSA units only generate desorption gas in the adsorption towers during rinsing and reverse venting states. Therefore, the desorption gas generation is intermittent and the pressure is unstable, making it difficult to meet the user's demand for a continuous and stable supply. Centralized storage in tanks before delivery to the user would not only increase the floor space required but also raise costs. Utility Model Content

[0003] This invention provides a desorption gas recovery system to solve the problem in the prior art where excessive desorption gas output from the PSA device causes excessive system pressure, forcing the desorption gas to be vented.

[0004] This utility model provides a desorption gas recovery system, including a first buffer tank, a compressor, a second buffer tank, a main outlet pipe, and a make-up gas pipe; The first buffer tank is provided with a desorption gas inlet, and the first buffer tank is connected to the air inlet of the compressor through a first pipe; The main exhaust pipe is connected to the exhaust port of the compressor; The air supply pipe is connected to the air inlet of the compressor; The second buffer tank is connected to the air inlet of the compressor through a second pipe, and the second buffer tank is connected to the air outlet of the compressor through a third pipe. The outlet end of the main air outlet pipe is connected to the user end for conveying desorption gas. A first air pressure detection device is connected to the main air outlet pipe, a second air pressure detection device is connected to the air inlet of the compressor, a first regulating valve is connected to the air supply pipe, a second regulating valve is connected to the second pipe, and a third regulating valve is connected to the third pipe.

[0005] Furthermore, a first vent pipe and a third air pressure detection device are connected to the first pipeline, and a fourth regulating valve is connected to the first vent pipe.

[0006] Furthermore, it also includes a first pressure controller, and the third air pressure detection device and the fourth regulating valve are both communicatively connected to the first pressure controller.

[0007] Furthermore, it also includes a second pressure controller, and a fourth air pressure detection device is connected to the air supply pipe. The fourth air pressure detection device and the first regulating valve are both communicatively connected to the second pressure controller.

[0008] Furthermore, it also includes a third pressure controller, and the second air pressure detection device and the second regulating valve are both communicatively connected to the third pressure controller.

[0009] Furthermore, it also includes a fourth pressure controller, and a fifth air pressure detection device is connected to the second pipeline. The fifth air pressure detection device and the third regulating valve are both communicatively connected to the fourth pressure controller.

[0010] Furthermore, it also includes a fourth pipe and a fifth pressure controller. One end of the fourth pipe is connected to the main outlet pipe, and the other end of the fourth pipe is connected to the air inlet of the compressor. A fifth regulating valve is connected to the fourth pipe. The first air pressure detection device and the fifth regulating valve are both communicatively connected to the fifth pressure controller.

[0011] Furthermore, it also includes a fifth pipe, one end of which is connected to the main exhaust pipe, and the other end of which is connected to the air inlet of the compressor. A programmable valve is connected to the fifth pipe.

[0012] Furthermore, a check valve is connected to any one or more of the first pipe, the second pipe, the air supply pipe, the fourth pipe, and the fifth pipe, and the check valve only allows airflow to enter the air inlet of the compressor.

[0013] Furthermore, a second vent pipe is connected to the main vent pipe, and a safety valve is connected to the second vent pipe.

[0014] The beneficial effects of this utility model are as follows: This application incorporates a second buffer tank at the compressor outlet, connected to the main outlet pipe via a third pipe, and further connected to the compressor inlet via another second pipe. When excessive desorbed gas is discharged from the PSA unit, causing the pressure in the main outlet pipe at the compressor outlet to exceed the set pressure, the second buffer tank absorbs and stores the excess desorbed gas, balancing the pressure in the main outlet pipe. When the pressure at the compressor inlet is insufficient, the desorbed gas stored in the second buffer tank is used to supplement the compressor inlet pressure. If the desorbed gas stored in the second buffer tank is still insufficient to supplement the compressor inlet pressure, external crude hydrogen is introduced through a make-up gas pipe, thereby reducing the venting of desorbed gas and improving its utilization rate. Attached Figure Description

[0015] Figure 1This is a schematic diagram of the overall structure of an embodiment of this utility model.

[0016] Figure 2 This is a schematic diagram showing the connection relationship between the first buffer tank and the compressor in an embodiment of this utility model.

[0017] Figure 3 This is a schematic diagram showing the connection relationship between the air supply pipe and the compressor in an embodiment of this utility model.

[0018] Figure 4 This is a schematic diagram of the connection relationship of the second buffer tank in this embodiment of the present invention.

[0019] Figure label: 1. First buffer tank; 11. First pipeline; 12. First vent pipe; 13. Third pressure detection device; 14. Fourth regulating valve; 2. Compressor; 21. Second pressure detection device; 3. Second buffer tank; 31. Second pipeline; 311. Second regulating valve; 312. Fifth pressure detection device; 32. Third pipeline; 321. Third regulating valve; 4. Main outlet pipe; 41. User end; 42. First pressure detection device; 43. Fourth pipeline; 431. Fifth pressure controller; 432. Fifth regulating valve; 44. Fifth pipeline; 441. Programmable valve; 45. Second vent pipe; 451. Safety valve; 5. Air supply pipe; 51. First regulating valve; 52. Fourth pressure detection device; 6. First pressure controller; 61. Flow meter; 62. Temperature sensor; 7. Second pressure controller; 8. Third pressure controller; 9. Fourth pressure controller; 91. Check valve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] The terms "first" and "second" in the specification and claims of this utility model may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "multiple" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] The following is combined Figures 1-4 This invention describes a desorption gas recovery system, comprising a first buffer tank 1, a compressor 2, a second buffer tank 3, a main outlet pipe 4, and a make-up pipe 5. The first buffer tank 1 has a desorption gas inlet and is connected to the inlet of the compressor 2 via a first pipe 11. The main outlet pipe 4 is connected to the outlet of the compressor 2, and the make-up pipe 5 is connected to the inlet of the compressor 2. The second buffer tank 3 is connected to the inlet of the compressor 2 via a second pipe 31 and to the outlet of the compressor 2 via a third pipe 32. The outlet end of the main outlet pipe 4 is connected to a user end 41 for delivering desorption gas.

[0024] A first air pressure detection device 42 is connected to the main air outlet pipe 4, and a second air pressure detection device 21 is connected to the air inlet of the compressor 2. A first regulating valve 51 is connected to the make-up air pipe 5, a second regulating valve 311 is connected to the second pipe 31, and a third regulating valve 321 is connected to the third pipe 32.

[0025] Specifically, such as Figure 1 As shown, the reverse desorption gas and flushing desorption gas in the PSA device enter the first buffer tank 1 from the desorption gas inlet on the first buffer tank 1. The desorption gas in the first buffer tank 1 is compressed by the compressor 2 and then delivered to the user end 41 through the gas outlet main pipe 4.

[0026] Specifically, the pressure of the main outlet pipe 4 is monitored by the first pressure detection device 42. When the pressure of the main outlet pipe 4 is greater than the pressure required by the client, the excess desorbed gas in the main outlet pipe 4 is introduced into the second buffer tank 3 through the third pipe 32 by adjusting the opening of the third regulating valve 321, thereby reducing the pressure in the main outlet pipe 4 and storing the excess desorbed gas in the second buffer tank 3. The desorbed gas pressure at the inlet of the compressor 2 is monitored by the second pressure detection device 21. When the desorbed gas pressure at the inlet of the compressor 2 is insufficient, the opening of the second regulating valve 311 is first adjusted to allow the desorbed gas stored in the second buffer tank 3 to enter the inlet of the compressor 2 for replenishment, maintaining the stability of the inlet pressure of the compressor 2. When the desorbed gas stored in the second buffer tank 3 is still insufficient to meet the pressure requirement of the inlet of the compressor 2, the opening of the first regulating valve 51 is adjusted to supplement the inlet of the compressor 2 with purified raw material gas through the replenishment pipe 5. The purified raw material gas can come from the crude hydrogen at the outlet of the raw material gas separator.

[0027] This application incorporates a second buffer tank 3 at the outlet of compressor 2, connecting the second buffer tank 3 to the main outlet pipe 4 via a third pipe 32, and connecting the second buffer tank 3 to the inlet of compressor 2 via a second pipe 31. This allows the second buffer tank 3 to absorb and store excess desorbed gas when excessive desorbed gas is discharged from the PSA unit, causing the pressure in the main outlet pipe 4 at the outlet of compressor 2 to exceed the set pressure. This balances the pressure in the main outlet pipe 4. When the pressure at the inlet of compressor 2 is insufficient, the desorbed gas stored in the second buffer tank 3 is used to supplement the pressure at the inlet of compressor 2. If the desorbed gas stored in the second buffer tank 3 is still insufficient to supplement the pressure at the inlet of compressor 2, external crude hydrogen is introduced through the gas supply pipe 5 to supplement the pressure, thereby reducing the venting of desorbed gas and improving its utilization rate.

[0028] Furthermore, a first vent pipe 12 and a third air pressure detection device 13 are connected to the first pipe 11, and a fourth regulating valve 14 is connected to the first vent pipe 12.

[0029] Specifically, such as Figure 2 As shown, a first vent pipe 12 and a third pressure detection device 13 are connected to the first pipeline 11, and a fourth regulating valve 14 is connected to the first vent pipe 12. The first pipeline 11 is connected to the first buffer tank 1, and the pressure of the first buffer tank 1 and the first pipeline 11 is monitored by the third pressure detection device 13. When the pressure in the first buffer tank 1 exceeds the set pressure range, the excess desorbed gas in the first buffer tank 1 is discharged through the first vent pipe 12 by adjusting the opening of the fourth regulating valve 14, thereby ensuring that the pressure of the first buffer tank 1 is within the working range.

[0030] Furthermore, it also includes a first pressure controller 6, a third air pressure detection device 13, and a fourth regulating valve 14, all of which are communicatively connected to the first pressure controller 6.

[0031] Specifically, such as Figure 2 As shown, the first pressure controller 6 is configured as a pressure indication controller (PIC), and the working range of the pressure of the first buffer tank 1 is set on the first pressure controller 6. In some specific embodiments, the working range of the pressure of the first buffer tank 1 is set to 0.03MPa~0.21MPa. The first pressure controller 6 judges the pressure signal monitored by the third air pressure detection device 13. When the pressure exceeds the set working range, the first pressure controller 6 adjusts the opening of the fourth regulating valve 14, and automatically discharges part of the desorbed gas in the first pipeline 11 through the first vent pipe 12, thereby realizing the automatic adjustment of the pressure of the first buffer tank 1.

[0032] In some alternative embodiments, such as Figure 2 As shown, a flow meter 61 and a temperature sensor 62 are also connected to the first pipe 11, which enables the monitoring of the flow rate and temperature of the desorbed gas in the first pipe 11. The flow meter 61 can be an orifice plate flow meter 61.

[0033] Furthermore, it also includes a second pressure controller 7, and a fourth air pressure detection device 52 is connected to the air supply pipe 5. The fourth air pressure detection device 52 and the first regulating valve 51 are both communicatively connected to the second pressure controller 7.

[0034] Specifically, such as Figure 3 As shown, the second pressure controller 7 is configured as a pressure indicator controller (PIC). The pressure range at the air inlet of the compressor 2 is set on the second pressure controller 7. The fourth pressure detection device 52 is located between the first regulating valve 51 and the compressor 2. The fourth pressure detection device 52 monitors the pressure at the air inlet of the compressor 2 connected to the air supply pipe 5. When the fourth pressure detection device 52 detects that the pressure exceeds the pressure range set by the second pressure controller 7, the second pressure controller 7 controls the first regulating valve 51 to maintain the stability of the pressure at the air inlet of the compressor 2 connected to the air supply pipe 5.

[0035] In some alternative embodiments, such as Figure 3 As shown, a flow meter 61 and a temperature sensor 62 are also connected to the gas supply pipe 5, which enables the monitoring of the flow rate and temperature of the crude hydrogen in the gas supply pipe 5. The flow meter 61 can be an orifice plate flow meter 61.

[0036] Furthermore, it also includes a third pressure controller 8, and the second air pressure detection device 21 and the second regulating valve 311 are both communicatively connected to the third pressure controller 8.

[0037] Specifically, such as Figure 3As shown, the third pressure controller 8 is configured as a pressure indication controller (PIC), and the pressure range at the inlet of the compressor 2 is set on the third pressure controller 8. The second air pressure detection device 21 monitors the pressure at the inlet of the compressor 2. When the pressure at the inlet of the compressor 2 is less than the pressure range set on the third pressure controller 8, the opening of the second regulating valve 311 is controlled and adjusted by the third pressure controller 8. This enables the automatic supply of desorption gas stored in the second buffer tank 3 to the inlet of the compressor 2 when the first buffer tank 1 cannot meet the supply air pressure at the inlet of the compressor 2.

[0038] Furthermore, it also includes a fourth pressure controller 9, and a fifth air pressure detection device 312 is connected to the second pipeline 31. The fifth air pressure detection device 312 and the third regulating valve 321 are both communicatively connected to the fourth pressure controller 9.

[0039] Specifically, such as Figure 4 As shown, the fourth pressure controller 9 is configured as a pressure indication controller (PIC). A fifth pressure detection device 312 is positioned between the second regulating valve 311 and the second buffer tank 3 to monitor the pressure within the second buffer tank 3. The fourth pressure controller 9 sets the operating pressure range for the second buffer tank 3. When the fifth pressure detection device 312 detects that the pressure within the second buffer tank 3 exceeds the set operating pressure range, the fourth pressure controller 9 adjusts the opening of the third regulating valve 321 to regulate the amount of desorbed gas entering the second buffer tank 3 from the main exhaust pipe 4, thereby automatically maintaining a stable pressure within the second buffer tank 3.

[0040] Furthermore, it also includes a fourth pipe 43 and a fifth pressure controller 431. One end of the fourth pipe 43 is connected to the main outlet pipe 4, and the other end of the fourth pipe 43 is connected to the air inlet of the compressor 2. A fifth regulating valve 432 is connected to the fourth pipe 43. The first air pressure detection device 42 and the fifth regulating valve 432 are both communicatively connected to the fifth pressure controller 431.

[0041] Specifically, such as Figure 4 As shown, the pressure of the main outlet pipe 4 is monitored by the first air pressure detection device 42, and the maximum permissible pressure of the main outlet pipe 4 is set on the fifth pressure controller 431. Using the fourth pipe 43 as a pressure stabilizing circuit, when the first air pressure detection device 42 detects that the pressure of the main outlet pipe 4 exceeds the maximum permissible pressure, the fifth pressure controller 431 adjusts the opening of the fifth regulating valve 432, returning the desorbed gas to the inlet of the compressor 2. At this time, the pressure at the inlet of the compressor 2 increases. The first pressure controller 6 can reduce the amount of desorbed gas entering the compressor 2 by adjusting the fourth regulating valve 14, thereby maintaining the stability of the pressure in the main outlet pipe 4.

[0042] In some alternative embodiments, the compressor 2 is selected as an oil-free compressor 2 with variable frequency control function, and the fifth controller is communicatively connected to the compressor 2. When the first pressure detection device 42 detects that the pressure of the outlet manifold 4 exceeds the maximum permissible pressure, the fifth pressure controller 431 can also maintain the pressure of the outlet manifold 4 within the maximum permissible pressure by controlling the power of the compressor 2.

[0043] Furthermore, it also includes a fifth pipe 44, one end of which is connected to the main exhaust pipe 4, and the other end of which is connected to the air inlet of the compressor 2. A programmable control valve 441 is connected to the fifth pipe 44.

[0044] Specifically, such as Figure 4 As shown, a programmable valve 441 is connected to the fifth pipe 44. When the user end 41 does not require desorption gas, the programmable valve 441 is opened. One end of the fifth pipe 44 is directly connected to the main exhaust pipe 4, and the other end of the fifth pipe 44 is connected to the air inlet of the compressor 2 through the second pipe 31. This allows the desorption gas discharged from the first buffer tank 1 to circulate internally between the compressor 2 and the second buffer tank 3. Excess desorption gas is discharged from the first vent pipe 12, thus achieving pressure maintenance of the desorption gas recovery system and maintaining stable system pressure.

[0045] Furthermore, one or more of the first pipe 11, the second pipe 31, the air supply pipe 5, the fourth pipe 43, and the fifth pipe 44 are connected to a check valve 91, which only allows airflow to enter the air inlet of the compressor 2.

[0046] In some specific embodiments, such as Figure 1 As shown, check valves 91 are connected to the first pipe 11, the second pipe 31, the air supply pipe 5, the fourth pipe 43, and the fifth pipe 44. The check valves 91 only allow airflow to enter the air inlet of the compressor 2, which improves the stability of the system.

[0047] Furthermore, a second vent pipe 45 is connected to the main vent pipe 4, and a safety valve 451 is connected to the second vent pipe 45.

[0048] Specifically, such as Figure 4 As shown, a second vent pipe 45 is connected to the main vent pipe 4. When the pressure in the main vent pipe 4 exceeds the set safety pressure, the safety valve 451 opens to release pressure from the main vent pipe 4.

[0049] Specifically, the first pressure detection device 42, the second pressure monitoring device, the third pressure monitoring device and the fourth pressure monitoring device are all configured as pressure sensors (PT), and the first pressure controller 6, the second pressure controller 7, the third pressure controller 8 and the fifth pressure controller 431 are all configured as pressure indicator controllers (PIC).

[0050] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A desorption gas recovery system, characterized in that: It includes a first buffer tank, a compressor, a second buffer tank, a main exhaust pipe, and a make-up air pipe; The first buffer tank is provided with a desorption gas inlet, and the first buffer tank is connected to the air inlet of the compressor through a first pipe; The main exhaust pipe is connected to the exhaust port of the compressor; The air supply pipe is connected to the air inlet of the compressor; The second buffer tank is connected to the air inlet of the compressor through a second pipe, and the second buffer tank is connected to the air outlet of the compressor through a third pipe. The outlet end of the main air outlet pipe is connected to the user end for conveying desorption gas. A first air pressure detection device is connected to the main air outlet pipe, a second air pressure detection device is connected to the air inlet of the compressor, a first regulating valve is connected to the air supply pipe, a second regulating valve is connected to the second pipe, and a third regulating valve is connected to the third pipe.

2. The desorption gas recovery system according to claim 1, characterized in that: The first pipeline is connected to a first vent pipe and a third air pressure detection device, and the first vent pipe is connected to a fourth regulating valve.

3. The desorption gas recovery system according to claim 2, characterized in that: It also includes a first pressure controller, and the third air pressure detection device and the fourth regulating valve are both communicatively connected to the first pressure controller.

4. The desorption gas recovery system according to claim 1, characterized in that: It also includes a second pressure controller, and a fourth air pressure detection device is connected to the air supply pipe. The fourth air pressure detection device and the first regulating valve are both communicatively connected to the second pressure controller.

5. The desorption gas recovery system according to claim 1, characterized in that: It also includes a third pressure controller, and the second air pressure detection device and the second regulating valve are both communicatively connected to the third pressure controller.

6. The desorption gas recovery system according to claim 1, characterized in that: It also includes a fourth pressure controller, and a fifth air pressure detection device is connected to the second pipeline. The fifth air pressure detection device and the third regulating valve are both communicatively connected to the fourth pressure controller.

7. The desorption gas recovery system according to any one of claims 1-6, characterized in that: It also includes a fourth pipe and a fifth pressure controller. One end of the fourth pipe is connected to the main outlet pipe, and the other end of the fourth pipe is connected to the air inlet of the compressor. A fifth regulating valve is connected to the fourth pipe. The first air pressure detection device and the fifth regulating valve are both communicatively connected to the fifth pressure controller.

8. The desorption gas recovery system according to claim 7, characterized in that: It also includes a fifth pipe, one end of which is connected to the main exhaust pipe and the other end of which is connected to the air inlet of the compressor. A programmable valve is connected to the fifth pipe.

9. The desorption gas recovery system according to claim 8, characterized in that: A check valve is connected to any one or more of the first pipe, the second pipe, the air supply pipe, the fourth pipe, and the fifth pipe. The check valve only allows airflow to enter the air inlet of the compressor.

10. The desorption gas recovery system according to claim 1, characterized in that: A second vent pipe is connected to the main vent pipe, and a safety valve is connected to the second vent pipe.

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