Pressure stabilizing device for pressure swing adsorption reverse gas release

Abstract

The utility model provides a kind of pressure swing adsorption reverse gas discharging pressure stabilizing device, belong to pressure swing adsorption technical field.The pressure swing adsorption reverse gas discharging pressure stabilizing device of the utility model, by the design of high pressure-low pressure two-way grading buffer, the reverse discharge main branch is divided into high pressure and low pressure two ways and is equipped with independent buffer mechanism, directional buffering treatment is carried out to different pressure grade gas, compared with the wide range adjustment mode of traditional single buffer tank, the exclusive adjustment ability of high pressure section and low pressure section gas is improved by grading treatment, the technical bottleneck that traditional mode is insufficient in wide pressure range adjustment ability, response lag is solved.High pressure reverse gas is directionally transported to preheater after being treated by high pressure buffer mechanism, low pressure reverse gas is directionally transported to compressor after being treated by low pressure buffer mechanism, realize the accurate shunt and directional transport of different pressure grade gas, optimize the operation stability of subsequent process equipment such as preheater, compressor.

Description

Technical Field

[0001] This utility model relates to the field of pressure swing adsorption technology, specifically to a pressure swing adsorption reverse gas release and pressure stabilization device. Background Technology

[0002] Pressure swing adsorption (PSA) technology, a gas separation and purification technique based on the principle of molecular selective adsorption, has been widely used in industrial purification, separation, capture, and tail gas treatment. In the chlor-alkali / polyvinyl chloride (PVC) production process, PSA technology is particularly suitable for the tail gas recovery and treatment stage of the vinyl chloride (VCM) distillation section. Its core function is to selectively adsorb residual impurities such as vinyl chloride and acetylene in the tail gas through an adsorbent, achieving purified tail gas that meets emission standards. Simultaneously, the backflow gas released during the desorption process (mainly composed of vinyl chloride and acetylene) is recycled to the preheater in the VCM conversion section, achieving resource recycling.

[0003] Currently, a typical pressure swing adsorption (PSA) unit consists of multiple adsorption towers, achieving continuous operation through cyclical switching of process steps such as adsorption, pressure equalization, reverse release, evacuation, backfilling and evacuation, pressure equalization and boosting, and final charging. During the reverse release stage, the high-pressure gas inside the adsorption tower is discharged to the preheater through the reverse release manifold. Its pressure change characteristics directly affect the stability of subsequent processes. Initially, the pressure inside the adsorption tower is relatively high, reaching approximately 0.2 MPa (gauge pressure), allowing this gas to smoothly enter the subsequent VCM conversion preheater. However, as the reverse release process progresses, the pressure inside the tower gradually decreases, reaching approximately 4 kPa (gauge pressure) by the end of the reverse release phase, with extreme low pressures even approaching atmospheric pressure. This significant pressure fluctuation leads to substantial fluctuations in the flow rate and pressure of the reverse release gas entering the preheater, resulting in unstable pressure in the acetylene manifold. This adversely affects the stable operation of the VCM conversion section and may even jeopardize the stability of the entire production system and product quality.

[0004] Therefore, optimizing the reverse venting pressure control of the pressure swing adsorption unit and reducing its pressure disturbance to downstream processes has become a key technical issue for improving the stability of the vinyl chloride production system. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model discloses a pressure swing adsorption reverse gas stabilization device. By branching the reverse gas main into a high-pressure reverse gas main and a low-pressure reverse gas main, and setting reverse gas buffer mechanisms in each branch, the device solves the problem of unstable reverse gas pressure in existing technologies, which affects the stable operation of downstream processes.

[0006] To achieve the above technical objectives, this utility model proposes a pressure swing adsorption reverse gas release stabilizing device, including an adsorption tower, a reverse gas release main pipe, a high-pressure reverse gas release buffer mechanism, and a low-pressure reverse gas release buffer mechanism. The gas phase outlet of the adsorption tower is connected to the reverse discharge main pipe, which branches into a high-pressure reverse discharge main pipe and a low-pressure reverse discharge main pipe. The outlet of the high-pressure reverse discharge main pipe is connected to the preheater, and the outlet of the low-pressure reverse discharge main pipe is connected to the compressor. The high-voltage reverse discharge main pipe is connected to the high-voltage reverse discharge buffer mechanism through a first parallel bypass, and the low-voltage reverse discharge main pipe is connected to the low-voltage reverse discharge buffer mechanism through a second parallel bypass. The high-pressure reverse discharge buffer mechanism includes a first inlet pipe, a high-pressure reverse discharge buffer tank, and a first outlet pipe connected in sequence along the airflow direction. The low-pressure reverse discharge buffer mechanism includes a second inlet pipe, a low-pressure reverse discharge buffer tank, and a second outlet pipe connected in sequence along the airflow direction.

[0007] Currently, while existing technologies employ buffer tanks to stabilize reverse venting pressure (such as patent CN219355790 U), these typically involve only a single buffer tank connected directly in series with the reverse venting main. This results in the initial high-pressure reverse venting gas mixing with the final low-pressure reverse venting gas within the buffer tank, failing to effectively address the problem of sudden pressure changes. To address the significant pressure variation characteristics during reverse venting, this invention proposes a dual-stage, high-pressure and low-pressure buffering architecture. This device is not simply an addition of a buffer unit; rather, it clearly branches the reverse-release main into high-pressure and low-pressure lines, each equipped with an independent and structurally symmetrical high-pressure and low-pressure reverse-release buffer mechanism. Each mechanism is connected to its corresponding pipeline via a parallel bypass. The buffered gases from both lines are respectively delivered to the preheater and compressor. The endpoint pressure of the high-pressure reverse-release main is the same as the pressure of the VCM reaction (acetylene reacts with hydrogen chloride to produce VCM), and it is used as the recovered gas, merging with the preheater outlet (a mixture of acetylene and hydrogen chloride) before entering the reactor. The endpoint pressure of the low-pressure reverse-release main is lower, similar to the inlet pressure of the acetylene compressor. After merging, it is pressurized by the acetylene compressor and sent to the conversion section along with the acetylene, where it is mixed with hydrogen chloride gas, heat-exchanged, and then enters the reactor. This design achieves the separation and directional buffering of reverse-release gases at different pressure levels during the pressure swing adsorption reverse-release process, stably controlling pressure fluctuations, thus fundamentally avoiding the problems of insufficient adjustment capacity and lag response of traditional single-buffer modes over a wide pressure range.

[0008] In a further example of this utility model, the high-pressure reverse discharge main pipe is provided with a first reverse discharge switching valve and a first pressure stabilizing switching valve in sequence along the airflow direction; The low-pressure reverse discharge main is provided with a second reverse discharge switching valve and a second pressure stabilizing switching valve in sequence along the airflow direction.

[0009] The first and second reverse discharge switching valves act as the main switches for the high-pressure and low-pressure reverse discharge mains, respectively, controlling the start and stop of high-pressure and low-pressure reverse discharge gas flow through them. When the reverse discharge gas pressure is high at the beginning of the adsorption tower's reverse discharge process, the first reverse discharge switching valve opens and the second reverse discharge shut-off valve closes, allowing gas to enter the high-pressure reverse discharge main. When the reverse discharge gas pressure is low in the later stages of the adsorption tower's reverse discharge process, the first reverse discharge switching valve closes and the second reverse discharge switching valve opens, allowing gas to enter the low-pressure reverse discharge main. Simultaneously, adjusting the opening degrees of the first and second pressure-stabilizing switching valves balances the reverse discharge gas pressure in the high-pressure and low-pressure reverse discharge mains, respectively.

[0010] In a further example of this utility model, the high-pressure reverse discharge buffer mechanism is connected to the pipe section between the first reverse discharge switching valve and the first pressure regulating switching valve; The low-pressure reverse discharge buffer mechanism is connected to the pipe section between the second reverse discharge switching valve and the second pressure stabilizing switching valve.

[0011] The high-pressure / low-pressure backflow buffer mechanism is precisely connected between the backflow switching valve and the pressure stabilizing switching valve, placing the mechanism in a critical position in the process flow—permitted by the backflow switching valve but not yet decided by the pressure stabilizing switching valve. This allows the entire unit to control the valve opening and closing combinations based on real-time operating conditions: when the backflow gas pressure in the high-pressure and low-pressure backflow mains is balanced, the gas flow bypasses the high-pressure / low-pressure backflow buffer mechanism and is directly delivered to the preheater and compressor via the high-pressure / low-pressure backflow mains respectively; when the backflow gas requires buffering by the high-pressure / low-pressure backflow buffer mechanism, the gas flow is guided into the high-pressure / low-pressure backflow buffer mechanism for pressure stabilization before returning to the high-pressure / low-pressure backflow mains and being delivered to the preheater and compressor.

[0012] In a further example of this utility model, a first air intake switching valve is provided on the first inlet pipe; A second intake switching valve is provided on the second inlet pipe.

[0013] In a further example of this utility model, a valve position interlock is provided between the first reverse discharge switching valve, the first pressure regulating switching valve, and the first intake switching valve; The second reverse discharge switching valve, the second pressure regulating switching valve, and the second air intake switching valve are equipped with valve position interlocking.

[0014] The inlet switching valve, along with the corresponding backflow switching valve and pressure stabilizing switching valve on the backflow main, forms a multi-action interlock triggered by valve position. When the backflow gas pressure is high at the beginning of the adsorption tower backflow (approximately 0.2 MPaG), the first backflow switching valve opens, interlocking to close the first pressure stabilizing switching valve, and simultaneously interlocking to open the first inlet switching valve, allowing the backflow gas to enter the high-pressure backflow buffer tank for buffering. When the backflow process progresses to the later stage, the adsorption tower pressure is low (approximately 0.09 MPaG), closing the first backflow switching valve and opening the second backflow switching valve, allowing the gas to enter the low-pressure backflow main. Through valve position interlocking, the first inlet switching valve closes, the first pressure stabilizing switching valve opens, and the remaining gas in the high-pressure backflow buffer tank and the high-pressure backflow main gradually reaches pressure equilibrium.

[0015] When the second reverse discharge switching valve opens, the second pressure regulating switching valve is interlocked closed, and the second intake switching valve is simultaneously interlocked open, allowing the reverse discharge gas to enter the low-pressure reverse discharge buffer tank for buffering. After the reverse discharge process is completed, the valve position interlock causes the second reverse discharge switching valve and the second intake switching valve to close, while the second pressure regulating switching valve opens, allowing the remaining gas in the low-pressure reverse discharge buffer tank and the low-pressure reverse discharge main pipe to gradually reach pressure equilibrium.

[0016] In a further example of this utility model, a first pressure regulating valve assembly is provided on the first outlet pipe; The second outlet pipe is equipped with a second pressure regulating valve assembly.

[0017] A pressure regulating valve assembly is installed in the outlet pipeline of the buffer tank. The opening of the regulating valve is controlled by the pressure regulating circuit. In conjunction with the volume of the buffer tank, reverse venting is slowly released to achieve stable control of the reverse venting pressure.

[0018] In a further example of this utility model, a bypass switch valve is also provided on the parallel bypass of the second pressure regulating valve.

[0019] Due to pressure fluctuations, the pressure of the vented gas fluctuates significantly in the early stages of the venting process, but becomes very small in the later stages. Compared to the initial pressure fluctuations of megapascals, the final pressure fluctuations may be in the single digits of kilopascals. At this point, opening the bypass valve can accelerate the final stage of the venting process, increase the venting flow area, and achieve pressure balance.

[0020] In a further example of this utility model, a first pressure gauge and a second pressure gauge are respectively provided on the high-pressure reverse discharge main pipe and the low-pressure reverse discharge main pipe, the first pressure regulating valve group is connected to the first pressure gauge, and the second pressure regulating valve group is connected to the second pressure gauge.

[0021] Specifically, the connection between the regulating valve assembly and the pressure gauge includes: The pressure detection unit (pressure gauge) is configured to detect the real-time pressure value of the process pipeline and generate the corresponding first signal. A controller unit, which is communicatively connected to the pressure detection unit, is used to receive the first signal, compare the first signal with a preset pressure value, and generate a control signal based on the comparison result. An electrical conversion unit, which is communicatively connected to the controller unit, is used to receive the control signal and convert the control signal into a standard air pressure signal; The pneumatic actuator includes a regulating valve body and a pneumatic actuator mechanism. The pneumatic actuator mechanism is connected to the electrical conversion unit through a pneumatic pipeline and is used to receive the standard pneumatic pressure signal and drive the valve core of the regulating valve body to change the opening of the process pipeline, thereby realizing automatic pressure regulation.

[0022] In a further example of this utility model, the high-pressure reverse discharge buffer tank is provided with a first buffer tank pressure gauge; the low-pressure reverse discharge buffer tank is provided with a second buffer tank pressure gauge.

[0023] The pressure gauges installed on the high-pressure and low-pressure reverse discharge buffer tanks are used to compare the readings with those on the pressure gauges installed on the outlet pipes of their respective buffer tanks, thereby detecting the stability of the system pressure.

[0024] In a further example of this utility model, a safety valve is provided on the tank body of the high-pressure reverse discharge buffer tank.

[0025] Overpressure in the buffer tank is prevented by installing a safety valve (an automatic valve that triggers mechanical action through the energy of the medium itself, such as pressure difference or temperature change) on the tank body.

[0026] In a further example of this utility model, a VCM toxic gas alarm and an acetylene combustible gas alarm are installed near the first pressure regulating valve group and the second pressure regulating valve group, so that the central control room can be notified in time when valve leakage occurs.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] (1) The pressure swing adsorption reverse gas stabilization device of this utility model, through the design of high pressure-low pressure dual-path graded buffer, branches the reverse gas main into high pressure and low pressure paths and configures independent buffering mechanisms to perform directional buffering treatment on gases of different pressure levels. Compared with the wide range adjustment mode of the traditional single buffer tank, the graded treatment improves the exclusive adjustment capability of high pressure and low pressure gas, and solves the technical bottleneck of insufficient adjustment capability and lag response of the traditional mode in a wide pressure range.

[0029] (2) In the pressure swing adsorption reverse gas stabilization device of this utility model, the high pressure reverse gas is processed by the high pressure buffer mechanism and then directed to the preheater, and the low pressure reverse gas is processed by the low pressure buffer mechanism and then directed to the compressor, so as to realize the precise diversion and directional delivery of gases of different pressure levels and optimize the operation stability of subsequent process equipment such as preheater and compressor. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 The diagram shows the pressure swing adsorption reverse gas release and pressure stabilization device of embodiments 1-3 of this utility model.

[0031] The above figures include the following reference numerals: 1-Adsorption tower, 2-High-pressure backflow main pipe, 3-Low-pressure backflow main pipe, 4-High-pressure backflow buffer tank, 5-Low-pressure backflow buffer tank, 6-Preheater, 7-Compressor, 8-First backflow switching valve, 9-Second backflow switching valve, 10-First pressure stabilizing switching valve, 11-Second pressure stabilizing switching valve, 12-First air inlet switching valve, 13-Second air inlet switching valve, 14-First pressure regulating valve group, 15-Second pressure regulating valve group, 16-First pressure gauge, 17-Second pressure gauge, 18-First buffer tank pressure gauge, 19-Second buffer tank pressure gauge, 20-Bypass switch valve, 21-Safety valve. Detailed Implementation

[0032] To facilitate understanding of this utility model, a more comprehensive description of it will be provided below, along with preferred embodiments. However, it should be understood that these embodiments are merely for more detailed explanation and should not be construed as limiting the utility model in any way, i.e., not limiting the scope of protection of this utility model.

[0033] Unless otherwise defined, the technical terms used in the following embodiments have the same meanings as commonly understood by those skilled in the art to which this invention pertains. Unless otherwise specified, the valves and pipes used in the following embodiments are conventional equipment.

[0034] In the accompanying drawings of this utility model, PT is a pressure gauge, PIA and PICA are abbreviations for pressure transmitters and their functions (I for indication, A for alarm, representing both functions, and C for regulation function), PSV is a safety valve, and PV is a pressure regulating valve.

[0035] In the accompanying drawings of this utility model, FO stands for "Fault Open," meaning that if the instrument's gas supply is interrupted, the valve should remain open. FC stands for "Fault Closed," the opposite of FO, where the valve remains closed when the gas supply is interrupted. CSO stands for "Lead Seal Open," meaning that to ensure the unobstructed flow of pipelines before and after the safety valve, the valve is permanently kept open by a lead seal. If a person skilled in the art closes the valve, they can identify this by the lead seal line and replace it promptly. If manual valves are installed in the pipelines before and after the safety valve, it is essential to ensure that the valves are in the lead-sealed open position; this is a standard practice for those skilled in the art.

[0036] The valve group between the first reverse release switching valve and the first parallel bypass along the airflow direction is a conventional valve group for reverse release in the prior art of pressure swing adsorption. Its function is to regulate the reverse release pressure of pressure swing adsorption, but the effect of a single valve group and related pipelines is not obvious, and there is still a large pressure fluctuation. This utility model is designed to improve its function.

[0037] Example 1

[0038] A pressure swing adsorption reverse gas release stabilizing device, such as Figure 1 As shown, it includes adsorption tower 1, reverse discharge main pipe, high-pressure reverse discharge buffer mechanism, and low-pressure reverse discharge buffer mechanism; The gas phase outlet of the adsorption tower 1 is connected to the reverse discharge main pipe, which branches into a high-pressure reverse discharge main pipe 2 and a low-pressure reverse discharge main pipe 3. The outlet of the high-pressure reverse discharge main pipe 2 is connected to the preheater 6, and the outlet of the low-pressure reverse discharge main pipe 3 is connected to the compressor 7. The high-voltage reverse discharge main pipe 2 is connected to the high-voltage reverse discharge buffer mechanism through the first parallel bypass, and the low-voltage reverse discharge main pipe 3 is connected to the low-voltage reverse discharge buffer mechanism through the second parallel bypass. The high-pressure reverse discharge buffer mechanism includes a first inlet pipe, a high-pressure reverse discharge buffer tank 4, and a first outlet pipe connected in sequence along the airflow direction. The low-pressure reverse discharge buffer mechanism includes a second inlet pipe, a low-pressure reverse discharge buffer tank 5, and a second outlet pipe connected in sequence along the airflow direction.

[0039] By clearly branching the main backflow manifold into high-pressure and low-pressure lines, and configuring independent and structurally symmetrical high-pressure and low-pressure backflow buffer mechanisms respectively, each mechanism is connected to the corresponding pipeline via a parallel bypass. The buffered gases from the two lines are then delivered to the preheater 6 and the compressor 7, respectively. This embodiment achieves the separation and directional buffering of backflow gases at different pressure levels during the pressure swing adsorption backflow process, stably controlling pressure fluctuations. This fundamentally avoids the problems of insufficient adjustment capability and lag response in traditional single-buffer mode over a wide pressure range.

[0040] Example 2

[0041] Based on the pressure swing adsorption reverse gas release stabilization device shown in Example 1, such as Figure 1 As shown, this embodiment further refines the switching valve, as detailed below: The high-pressure backflow main 2 is sequentially equipped with a first backflow switching valve 8 and a first pressure-stabilizing switching valve 10 along the airflow direction; the low-pressure backflow main 3 is sequentially equipped with a second backflow switching valve 9 and a second pressure-stabilizing switching valve 11 along the airflow direction. A high-pressure backflow buffer mechanism is connected to the pipe section between the first backflow switching valve 8 and the first pressure-stabilizing switching valve 10; a low-pressure backflow buffer mechanism is connected to the pipe section between the second backflow switching valve 9 and the second pressure-stabilizing switching valve 11. A first intake switching valve 12 is provided on the first inlet pipe; a second intake switching valve 13 is provided on the second inlet pipe.

[0042] To ensure coordinated operation of the system, valve position interlocks are provided between the first reverse discharge switching valve 8, the first pressure regulating switching valve 10, and the first air intake switching valve 12; similarly, valve position interlocks are also provided between the second reverse discharge switching valve 9, the second pressure regulating switching valve 11, and the second air intake switching valve 13.

[0043] Specifically, the implementation process of valve position interlock is as follows: When the initial reverse venting pressure in adsorption tower 1 is high (approximately 0.2 MPaG), the first reverse venting switching valve 8 opens, interlocking to close the first pressure stabilizing switching valve 10, and simultaneously interlocking to open the first inlet switching valve 12, allowing the reverse venting gas to enter the high-pressure reverse venting buffer tank 4 for buffering. As the reverse venting process progresses to the later stages, the adsorption tower pressure decreases (approximately 0.09 MPaG), the first reverse venting switching valve 8 closes, and the second reverse venting switching valve 9 opens, allowing the gas to enter the low-pressure reverse venting main pipe 3. Through valve position interlocking, the first inlet switching valve 12 closes, the first pressure stabilizing switching valve 10 opens, and the remaining gas in the high-pressure reverse venting buffer tank 4 and the high-pressure reverse venting main pipe 2 gradually reaches pressure equilibrium.

[0044] When the second reverse discharge switching valve 9 is opened, the second pressure regulating switching valve 11 is interlocked closed, and the second intake switching valve 13 is simultaneously interlocked open, allowing the reverse discharge gas to enter the low-pressure reverse discharge buffer tank 5 for buffering. After the reverse discharge process is completed, the valve position interlock causes the second reverse discharge switching valve 9 to close, the second intake switching valve 13 to close, and the second pressure regulating switching valve 11 to open, allowing the residual gas in the low-pressure reverse discharge buffer tank 5 and the low-pressure reverse discharge main pipe 3 to gradually reach pressure equilibrium.

[0045] Example 3

[0046] Based on the pressure swing adsorption reverse gas release stabilization device shown in Example 1, such as Figure 1 As shown, this embodiment further refines the pressure-related device, as detailed below: The first outlet pipe is equipped with a first pressure regulating valve group 14; the second outlet pipe is equipped with a second pressure regulating valve group 15. The outlet pipe of the buffer tank is equipped with a pressure regulating valve group, which controls the opening of the regulating valve through a pressure regulating circuit. In conjunction with the volume of the buffer tank, reverse venting is slowly released to achieve stable control of the reverse venting pressure.

[0047] A first pressure gauge 16 and a second pressure gauge 17 are respectively installed on the high-pressure reverse discharge main pipe 2 and the low-pressure reverse discharge main pipe 3. The first pressure regulating valve group 14 is connected to the first pressure gauge 16, and the second pressure regulating valve group 15 is connected to the second pressure gauge 17.

[0048] Specifically, the connection between the regulating valve assembly and the pressure gauge includes: The pressure detection unit (pressure gauge) is configured to detect the real-time pressure value of the process pipeline and generate the corresponding first signal. A controller unit, which is communicatively connected to the pressure detection unit, is used to receive the first signal, compare the first signal with a preset pressure value, and generate a control signal based on the comparison result. An electrical conversion unit, which is communicatively connected to the controller unit, is used to receive the control signal and convert the control signal into a standard air pressure signal; The pneumatic actuator includes a regulating valve body and a pneumatic actuator mechanism. The pneumatic actuator mechanism is connected to the electrical conversion unit through a pneumatic pipeline and is used to receive the standard pneumatic pressure signal and drive the valve core of the regulating valve body to change the opening of the process pipeline, thereby realizing automatic pressure regulation.

[0049] The second pressure regulating valve group 15 of the low-pressure backflow buffer tank 5 is equipped with a bypass switch valve 20. When the backflow process reaches the later stage, the pressure is low (about 4 kPaG). The bypass switch valve 20 can be opened as needed to increase the backflow gas flow area, or switch back to the low-pressure backflow main pipe 3.

[0050] The high-pressure reverse discharge buffer tank 4 is equipped with a first buffer tank pressure gauge 18; the low-pressure reverse discharge buffer tank 5 is equipped with a second buffer tank pressure gauge 19.

[0051] The pressure gauges installed on the bodies of the high-pressure reverse discharge buffer tank 4 and the low-pressure reverse discharge buffer tank 5 are used to compare the readings with those of the pressure gauges installed on the outlet pipes of their respective buffer tanks, thereby indicating the stability of the system pressure.

[0052] Example 4

[0053] Based on the pressure swing adsorption reverse gas release stabilizing device described in Example 1, such as Figure 1 Furthermore, this embodiment further refines the other valves of the device.

[0054] Overpressure in the buffer tank is prevented by installing a safety valve 21 (an automatic valve that triggers mechanical action through the energy of the medium itself (such as pressure difference or temperature change)) on the tank body of the high-pressure reverse discharge buffer tank 4.

[0055] A VCM toxic gas alarm and an acetylene combustible gas alarm are installed near the first pressure regulating valve group 14 and the second pressure regulating valve group 15. When valve leakage occurs, the alarm can be promptly notified to the central control room.

[0056] Manual valves are provided at the inlet of the high-pressure reverse discharge main pipe 2 and the high-pressure reverse discharge buffer mechanism, the outlet of the high-pressure reverse discharge main pipe 2 and the high-pressure reverse discharge buffer mechanism, the inlet of the low-pressure reverse discharge main pipe 3 and the low-pressure reverse discharge buffer mechanism, and the outlet of the low-pressure reverse discharge main pipe 3 and the low-pressure reverse discharge buffer mechanism. Those skilled in the art can make corresponding adjustments according to the specific working conditions.

[0057] It should be noted that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions; the dimensional data in this embodiment do not necessarily limit the technical solution, but merely illustrate one specific working condition. For those skilled in the art to which this invention pertains, several simple improvements and modifications can be made without departing from the concept of the present invention, and all such improvements and modifications should be considered to fall within the scope of protection of the present invention.

Claims

1. A pressure swing adsorption reverse gas release and stabilization device, characterized in that, Includes an adsorption tower (1), a reverse discharge main pipe, a high-pressure reverse discharge buffer mechanism, and a low-pressure reverse discharge buffer mechanism; The gas phase outlet of the adsorption tower (1) is connected to the reverse discharge main pipe, which is branched into a high-pressure reverse discharge main pipe (2) and a low-pressure reverse discharge main pipe (3). The outlet of the high-pressure reverse discharge main pipe (2) is connected to the preheater (6), and the outlet of the low-pressure reverse discharge main pipe (3) is connected to the compressor (7). The high-voltage reverse discharge main pipe (2) is connected to the high-voltage reverse discharge buffer mechanism through the first parallel bypass, and the low-voltage reverse discharge main pipe (3) is connected to the low-voltage reverse discharge buffer mechanism through the second parallel bypass. The high-pressure reverse discharge buffer mechanism includes a first inlet pipe, a high-pressure reverse discharge buffer tank (4), and a first outlet pipe connected in sequence along the airflow direction. The low-pressure reverse discharge buffer mechanism includes a second inlet pipe, a low-pressure reverse discharge buffer tank (5), and a second outlet pipe connected in sequence along the airflow direction.

2. The pressure swing adsorption reverse gas release and stabilization device according to claim 1, characterized in that, The high-pressure reverse discharge main pipe (2) is provided with a first reverse discharge switching valve (8) and a first pressure stabilizing switching valve (10) in sequence along the airflow direction. The low-pressure reverse discharge main pipe (3) is provided with a second reverse discharge switching valve (9) and a second pressure stabilizing switching valve (11) in sequence along the airflow direction.

3. The pressure swing adsorption reverse gas release and stabilization device according to claim 2, characterized in that, The high-pressure reverse discharge buffer mechanism is connected to the pipe section between the first reverse discharge switching valve (8) and the first pressure regulating switching valve (10); The low-pressure reverse discharge buffer mechanism is connected to the pipe section between the second reverse discharge switching valve (9) and the second pressure stabilizing switching valve (11).

4. The pressure swing adsorption reverse gas release and stabilization device according to claim 3, characterized in that, The first inlet pipe is equipped with a first air intake switching valve (12); A second intake switching valve (13) is provided on the second inlet pipe.

5. The pressure swing adsorption reverse gas release and stabilization device according to claim 4, characterized in that, A valve position interlock is provided between the first reverse discharge switching valve (8), the first pressure regulating switching valve (10), and the first intake switching valve (12); The second reverse discharge switching valve (9), the second pressure regulating switching valve (11), and the second air intake switching valve (13) are equipped with valve position interlocking.

6. The pressure swing adsorption reverse gas release and stabilization device according to claim 1, characterized in that, The first outlet pipe is equipped with a first pressure regulating valve group (14); The second outlet pipe is equipped with a second pressure regulating valve group (15).

7. The pressure swing adsorption reverse gas release and stabilization device according to claim 6, characterized in that, The second pressure regulating valve group (15) is also provided with a bypass switch valve (20) on the parallel bypass.

8. The pressure swing adsorption reverse gas release and stabilization device according to claim 6, characterized in that, The high-pressure reverse discharge main (2) and the low-pressure reverse discharge main (3) are respectively equipped with a first pressure gauge (16) and a second pressure gauge (17); The first pressure regulating valve group (14) is connected to the first pressure gauge (16), and the second pressure regulating valve group (15) is connected to the second pressure gauge (17).

9. The pressure swing adsorption reverse gas release and stabilization device according to claim 1, characterized in that, The high-pressure reverse discharge buffer tank (4) is equipped with a first buffer tank pressure gauge (18); the low-pressure reverse discharge buffer tank (5) is equipped with a second buffer tank pressure gauge (19).

10. The pressure swing adsorption reverse gas release and stabilization device according to claim 1, characterized in that, The high-pressure reverse discharge buffer tank (4) is equipped with a safety valve (21).

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