Pressure stabilization type pressurized gas purification system and working method thereof

Abstract

The invention discloses a pressure stabilization type pressurized gas purification system and a working method thereof, and particularly relates to the technical field of system pressure stabilization and drying purification. The technical problems that in the prior art, a main element of a pressurization system is a single compressor, no pressure compensation system exists, and the pressurization system for gas drying and purifying treatment is unstable in output gas pressure, the compressor is prone to vibration, and the output gas quality is poor are solved. According to the technical scheme, gas pressurized for the first time is fed into an adsorption tower and a regeneration tower to be dried and purified, and gas impurities in the adsorption tower in a purification system are removed through an adsorption material in equipment; the regeneration tower is used for regenerating an adsorption material under the high-temperature action of pyrolysis adsorption gas and switching functions under the control of a gas flow direction control system; the gas quality can be improved, moisture and impurities in gas can be reduced, and the service life of lower-level equipment is prolonged; the gas pressure stability is maintained; and the energy utilization rate is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of system pressure stabilization and drying purification, and in particular to a pressure-stabilizing pressurized gas purification system and a working method thereof. Background Art

[0002] With the continuous advancement of industrialization and urbanization in my country, the demand for high-pressure gas has grown rapidly in many industries. As the core equipment for high-pressure gas output, the demand for boosting system in China is rapidly expanding. Relevant research data show that in terms of industrial manufacturing, compressed gas is a common power source in industrial manufacturing. In 2023, the market size of pneumatic tools in my country will exceed 10 billion yuan, with an annual growth rate of more than 10%. However, pneumatic systems usually require a pressure between 0.7-1.2MPa. The boosting system with only a single compressor and a lack of a pressure stabilization system will have unstable gas pressure control output, and due to the inaccurate pressure control, pressure fluctuations will occur at the outlet of the entire system, and frequent pressure fluctuations may cause additional vibrations in the system. This vibration will accelerate the wear of the mechanical parts of the equipment in the entire system, and then cause the compressor and pipeline to generate huge noise and even damage the entire boosting system.

[0003] Moreover, most boosting systems do not have a gas drying and purification system. The gas that has not been dried and purified enters the compressor directly for compression. The lack of treatment for moisture and impurities results in low gas quality and is unable to meet high purity requirements. After impurities enter the compressor, they may also contaminate the lubricating oil system, causing the lubrication performance to deteriorate. Water vapor will condense into liquid water in the high-pressure gas, which will accelerate the aging of bearings and other moving parts together with impurities, and will also cause serious wear and corrosion to equipment using the gas and shorten the life of the equipment.

[0004] In addition, social and economic development has led to a sharp increase in the amount of high-pressure gas. The boosting system without gas treatment and only single-time boosting has low energy utilization, poor gas quality and short equipment life, which wastes resources and causes serious environmental problems. Summary of the invention

[0005] Therefore, the present invention solves the technical problems in the prior art that the main component of the boosting system is a single compressor and there is no pressure compensation system and gas drying and purification treatment, the output gas pressure of the boosting system is unstable, the compressor is prone to vibration and the output gas quality is poor; the present invention provides a pressure-stabilized boosting gas purification system and its working method, the gas after the first boosting is sent to the adsorption tower, the regeneration tower is dried and purified, the adsorption tower in the purification system removes gas impurities through the adsorption material in the equipment, the regeneration tower regenerates the adsorption material through the high temperature effect of thermal desorption adsorption gas and switches the function through the control of the gas flow control system, and then part of the high-pressure purified gas is transported to the pressure compensation system, and the compensating centrifugal compressor jointly controlled by the pressure sensor, PLC, frequency converter and variable frequency motor can maintain the stability of the pressure of the entire system while increasing the system output pressure; improves the quality of the gas, reduces the moisture and impurities in the gas, and increases the life of the lower-level equipment; maintains the stability of the gas pressure and improves the utilization rate of energy. In addition, the entire system is small in size, simple in structure, and has low working vibration and noise, which greatly improves the application scenarios of the system.

[0006] The inventive concept of the present invention is: to optimize the design based on the single compression of gas, to recover the high-pressure gas after drying and purification through the pressure compensation system and to perform secondary pressurization; the present invention includes a primary pressurization system, an adsorption tower, a regeneration tower, a gas flow control system, a purified gas recovery system, a desorbed gas cooling and filtering system, and a pressure compensation system. Through the synergistic effect of the above devices and units, the pressure compensation system is used to partially recover and re-pressurize the high-pressure gas after drying and purification, thereby achieving stable control of the air pressure of the pressurization system, quality assurance of the output high-pressure gas, and improvement of the high energy utilization rate of the entire system; the main centrifugal compressor pressurizes the gas and then transports it to the first plate-fin heat exchanger, which cools the gas and then transports the gas to the gas flow control system, and the gas is transported to the adsorption tower through a pipeline. Water and impurities are removed through the adsorption tower, and part of the purified gas is recovered through the purified gas recovery system, heated and transported to the regeneration tower for desorption. The desorbed gas enters the desorption gas cooling and filtration system through the pipeline for cooling and filtration, and then is transported back to the gas flow control system; most of the remaining gas is transported to the lower-level equipment, and another part of the gas is recovered by the pressure compensation system for secondary boosting. The first-stage boosting system performs initial boosting and cools and stores it before outputting high-pressure gas, of which part of the high-pressure gas is recovered by the secondary compression system for secondary boosting. The compensating centrifugal compressor of this system is jointly controlled by the pressure sensor, PLC, inverter and variable frequency motor to control the speed and start and stop, and recovers part of the high-pressure gas after boosting and then transports it back to the first-stage boosting system to maintain the pressure stability of the entire boosting system.

[0007] To achieve the above objectives, the present invention adopts the following technical scheme: a pressure-stabilized pressurized gas purification system, comprising a primary pressurizing system, an adsorption tower, a regeneration tower, a gas flow control system, a purified gas recovery system, a desorbed gas cooling and filtration system, and a pressure compensation system; the primary pressurizing system is used to transport high-pressure gas to the entire system; the adsorption tower utilizes the adsorption material in the tower to adsorb moisture and impurities in the gas; the gas flow control system is connected to the adsorption tower for transporting purified gas; the regeneration tower utilizes heated gas to desorb the adsorption material; the gas flow control system is connected to the regeneration tower for transporting desorbed gas; the pressure compensation system is connected to the gas flow control system for partially recovering the high-pressure gas that has undergone the first pressurization and drying purification treatment for secondary pressurization for pressure compensation of the system.

[0008] The first-stage boosting system includes a main centrifugal compressor for the first boosting gas and a first plate-fin heat exchanger for cooling the first-stage boosting system for the first boosting gas; the gas flow control system includes a ball valve one, a ball valve two, a ball valve three, a ball valve four, a ball valve five, a ball valve six, a ball valve seven, and a ball valve eight for adjusting the gas flow direction; the purified gas recovery system includes a blower for recovering gas and a second plate-fin heat exchanger for heating gas; the desorption gas cooling and filtering system includes a third plate-fin heat exchanger for cooling the desorbed gas and a filter for filtering impurities in the desorption gas; the pressure compensation system includes a compensating centrifugal compressor for recovering and re-boosting the high-pressure gas output by the system, a pressure sensor for measuring pressure, a PLC for receiving sensor signals, a frequency converter for controlling the motor speed, and a variable frequency motor for controlling the start and stop of the compensating centrifugal compressor.

[0009] Furthermore, the adsorption tower utilizes adsorption materials to adsorb moisture and impurities in the gas, and includes a pre-purification gas inlet, a first sewage outlet, and a post-purification gas outlet. The pre-purification gas inlet is connected to a gas flow control system for conveying pre-purification gas; the first sewage outlet is connected to a sewage pipe for removing moisture and impurities accumulated in the equipment; and the post-purification gas outlet is connected to the gas flow control system for conveying gas.

[0010] Furthermore, the regeneration tower utilizes hot purified gas to desorb impurities to regenerate the adsorption material, and the regeneration tower includes a hot purified gas inlet connected to the gas flow control system for conveying hot purified gas into the regeneration tower; a second sewage outlet connected to a sewage pipe for removing solid impurities accumulated in the equipment; and the thermal desorption gas outlet is connected to the gas flow control system for conveying gas.

[0011] Furthermore, the gas flow control system is provided with four inlets and outlets respectively connected to the primary boosting system, the purified gas recovery system, the desorption gas cooling system and the pressure compensation system. In the gas flow control system, when the adsorption tower plays an adsorption role and the regeneration tower plays a desorption role, the ball valve 1, the ball valve 4, the ball valve 6 and the ball valve 7 are opened, and the ball valve 2, the ball valve 3, the ball valve 5 and the ball valve 8 are closed; when the adsorption material in the regeneration tower is regenerated enough and the adsorption material in the adsorption tower is consumed enough, the ball valve 2, the ball valve 3, the ball valve 5 and the ball valve 8 are opened, and the ball valve 1, the ball valve 4, the ball valve 6 and the ball valve 7 are closed, so as to change the gas flow direction so that the regeneration tower plays an adsorption role and the adsorption tower plays a desorption role, and the cycle repeats.

[0012] Furthermore, the gas purification and recovery system also includes a blower for recovering part of the purified gas, the blower including a purified gas inlet and a purified gas outlet; a second plate-fin heat exchanger for heating the recovered gas, the plate-fin heat exchanger including a cold gas inlet, a second metal plate and a hot gas outlet.

[0013] Furthermore, the cold gas inlet is connected to the purified gas outlet; and the hot gas outlet is connected to the gas flow control system.

[0014] Furthermore, the cooling and filtering system includes a third plate-fin heat exchanger for cooling and desorbing hot gas, the third plate-fin heat exchanger including a hot gas inlet, a metal plate and a cold gas outlet; a bag filter for filtering the cooling gas; the hot gas inlet is connected to the gas flow control system; and the cold gas outlet is connected to the filter.

[0015] Furthermore, the pressure compensation system is used to recover and re-pressurize the gas that has been pressurized and dried and purified by the first-stage supercharging system, including a compensating centrifugal compressor that recovers the supercharged gas for secondary supercharging, the compensating centrifugal compressor including a recovered supercharged gas inlet, a compressor impeller and a compensating gas outlet; a pressure sensor for measuring the pressure of the high-pressure gas after compensation and before cooling, the sensor including a pressure measuring end and a pressure signal output end; a PLC for receiving the sensor signal; a frequency converter for controlling the speed of the variable frequency motor; a variable frequency motor for controlling the start and stop of the compensating centrifugal compressor; the recovered supercharged gas inlet is connected to the gas flow control system for recovering the supercharged gas; the compressor impeller is used for secondary supercharging of the recovered supercharged gas; the compensating gas outlet is connected to the front of the hot supercharged gas inlet for stabilizing the pressure level of the entire system; the pressure sensor is connected to the front of the hot supercharged gas inlet for measuring the pressure; the PLC is used to receive the signal of the pressure sensor; the frequency converter is used to receive the analog signal of the PLC; the variable frequency motor is used to receive the output frequency and voltage of the frequency converter to control the speed and start and stop of the compensating centrifugal compressor.

[0016] The present invention also provides a working method of a pressure-stabilized pressurized gas purification system, which uses the above-mentioned pressure-stabilized pressurized gas purification system and includes the following steps:

[0017] S1: The gas that needs to be pressurized and dried and purified is transported to the gas inlet through a pipeline and enters the main centrifugal compressor. The gas is thrown out from the center to the outside by the high-speed rotating impeller to obtain kinetic energy, and then passes through the gradually expanding volute to convert part of the kinetic energy into pressure energy. After the pressure is increased, the gas is sent out from the pressurized gas outlet; the pressurized gas is transported to the first plate-fin heat exchanger through a pipeline for cooling;

[0018] S2: The cooling gas is transported to the adsorption tower through a pipeline. The adsorption material in the adsorption tower removes moisture and impurities in the gas and then sends the gas out from the purified gas outlet. The impurities accumulated in the equipment are discharged from the sewage outlet;

[0019] S3: The purified gas is transported to the downstream equipment through pipelines, and part of the purified gas is recovered by the blower and compensating centrifugal compressor;

[0020] S4: The partially purified gas recovered by the blower is transported to the second plate-fin heat exchanger through a pipeline for heating. The heated gas is transported to the regeneration tower through a pipeline. The adsorption material that has adsorbed moisture and impurities in the regeneration tower is desorbed from the impurities by the high temperature effect of the heated gas, so that the adsorption material is regenerated and the gas is output from the thermal desorption gas outlet. The solid impurities accumulated inside the equipment are discharged from the second sewage outlet.

[0021] S5: The thermal desorption gas is transported to the third plate-fin heat exchanger through a pipeline for cooling and then the gas is sent out from the cold desorption gas outlet;

[0022] S6: The cold desorbed gas is transported to the filter through a pipeline, and after being filtered by the filter bag, the gas is re-transported into the entire system;

[0023] S7: The pressure measuring end of the pressure sensor is connected to the hot pressurized gas inlet, and the measured pressure is converted into an analog signal and transmitted to the PLC through the signal output end;

[0024] S8: PLC converts the analog signal output by the pressure sensor into an analog signal according to the program setting and outputs it to the frequency converter;

[0025] S9: The inverter uses the analog signal output by the PLC to adjust the output frequency and voltage;

[0026] S10: The variable frequency motor receives the output frequency and voltage of the frequency converter to control the speed and start and stop of the compensation centrifugal compressor;

[0027] S11: Most of the purified gas sent out from the purified gas outlet is sent to the downstream equipment, and part of the gas is transported to the recovery boost gas inlet through the pipeline, and enters the compensating centrifugal compressor. It is thrown out from the center to the outside by the high-speed rotating impeller to obtain kinetic energy, and then passes through the gradually expanding volute to convert part of the kinetic energy into pressure energy. After the pressure is increased, the gas is sent out from the boost gas outlet and re-transported to the hot boost gas inlet through the pipeline.

[0028] In the above technical solution, the technical effects and advantages provided by the present invention are:

[0029] 1. The present invention recovers the pressurized gas for secondary pressurization through a pressure-stabilizing pressurized gas purification system. For a single compressor pressurization system without a pressure-stabilizing system, the system pressure is difficult to maintain. The present invention sends part of the high-pressure gas to the pressure compensation system, and the speed and start-stop are jointly controlled by the pressure sensor, PLC, inverter and variable frequency motor. The variable frequency motor controls the speed and start-stop of the compensation centrifugal compressor, which can maintain the balance of the entire system pressure while increasing the system output pressure.

[0030] 2. The adsorption tower in the purification system of the present invention removes moisture and impurities from the gas through the adsorption material in the equipment, and the regeneration tower regenerates the adsorption material through the high temperature effect of thermal desorption adsorption gas and switches the function through the control of the gas flow control system. The quality of the output gas is improved, the moisture and impurities in the gas are reduced, and the life of the lower-level equipment is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0032] Figure 1 It is a structural schematic diagram of the pressure-stabilizing pressurized gas purification system of the present invention;

[0033] Figure 2 A schematic structural diagram of a pressure-stabilizing type pressurized gas purification system having a switching function of an adsorption tower and a regeneration tower according to the present invention;

[0034] Description of reference numerals:

[0035] 1. First-stage boosting system; 11. Main centrifugal compressor; 12. Gas inlet; 13. Compressor impeller; 14. Boosted gas outlet; 15. Hot boosted gas inlet; 16. First metal plate; 17. First plate-fin heat exchanger; 18. Cold boosted gas outlet; 2. Gas flow control system; 21. Ball valve one; 22. Ball valve two; 23. Ball valve three; 24. Ball valve four; 25. Ball valve five; 26. Ball valve six; 27. Ball valve seven; 28. Ball valve eight; 3. Regeneration tower; 31. Gas inlet before purification; 32. First sewage outlet; 33. Gas outlet after purification; 4. Purified gas recovery system; 41. Blower; 42. Purified gas inlet; 43. Purified gas outlet; 44. First Second plate-fin heat exchanger; 45. cold gas inlet; 46. second metal plate; 47. hot gas outlet; 5. regeneration tower; 51. hot purified gas inlet; 52. second sewage outlet; 53. thermal desorption gas outlet; 6. thermal desorption gas cooling and filtration system; 61. hot gas inlet; 62. third plate-fin heat exchanger; 63. third metal plate; 64. cold gas outlet; 65. filter; 66. filter bag; 7. pressure compensation system; 71. compensating centrifugal compressor; 72. recovered pressurized gas inlet; 73. compressor impeller; 74. compensation gas outlet; 75 pressure measuring end; 76. pressure sensor; 77. pressure signal output end; 78. PLC; 79. frequency converter; 791. variable frequency motor. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, this example provides a pressure-stabilized boosted gas purification system, which improves gas quality and keeps pressure and flow stable by delivering purified gas to a two-stage boosting system. The system includes a blower 1, an adsorption tower 3, a regeneration tower 5, a gas flow control system 2, a purified gas recovery system 4, a desorbed gas cooling and filtering system 6, a primary boosting system 7, and a secondary boosting system 8. The blower 1 is used to deliver gas to the entire system; the adsorption tower 3 uses an adsorption material such as activated carbon in the tower to adsorb impurities in the gas; the gas flow control system 2 is connected to the adsorption tower 3 for delivering purified gas; the regeneration tower 5 uses heated gas to desorb the adsorption material; the gas flow control system 2 is connected to the regeneration tower 6 for delivering desorbed gas; the primary boosting system 7 is connected to the gas flow control system 2 for the first boosting of the purified gas; and the compressed gas recovery boosting system is connected to the gas flow control system for recovering the gas after the primary boosting for secondary boosting.

[0039] The first-stage boosting system is a device that transports high-pressure gas into the entire system, including a main centrifugal compressor 11, a gas inlet 12, a compressor impeller 13, a boosted gas outlet 14, a first plate-fin heat exchanger 17, a hot boosted gas inlet 15, a first metal plate 16, and a cold boosted gas outlet 18.

[0040] The gas flow control system 2 includes ball valve 1 21, ball valve 2 22, ball valve 3 23, ball valve 4 24, ball valve 5 25, ball valve 6 26, ball valve 7 27 and ball valve 8 28. The gas flow direction is controlled by opening and closing different ball valves to switch the adsorption tower 3 and the regeneration tower 5.

[0041] The adsorption tower 3 includes a pre-purification gas inlet 31 , a first sewage outlet 32 ​​, and a post-purification gas outlet 33 .

[0042] The purified gas recovery system 4 includes a blower 41 , a purified gas inlet 42 , a purified gas outlet 43 , a second plate-fin heat exchanger 44 , a cold gas inlet 45 , a second metal plate 46 , and a hot gas outlet 47 .

[0043] The regeneration tower 5 includes a heat-purified gas inlet 51 , a second sewage outlet 52 , and a thermal desorption gas outlet 53 .

[0044] Desorption gas cooling and filtering system; hot gas inlet 61, third plate-fin heat exchanger 62, third metal plate 63, cold gas outlet 64, filter 65, filter bag 66.

[0045] When the adsorption tower 3 starts adsorption and the regeneration tower 5 starts regeneration, the ball valve 1 21, the ball valve 4 24, the ball valve 6 26 and the ball valve 7 27 are opened, the ball valve 2 22, the ball valve 3 23, the ball valve 5 25 and the ball valve 8 28 are closed, and the gas flows as follows: Figure 1 shown.

[0046] The gas is transported to the gas inlet 12 through the pipeline and enters the main centrifugal compressor 11. After being thrown out from the center by the high-speed rotating compressor impeller 13, it obtains kinetic energy. Then, when passing through the gradually expanding volute, the flow rate of the gas slows down due to the gradual expansion of the channel. When the gas flow rate decreases, part of the kinetic energy is converted into pressure energy, thereby causing an increase in pressure and temperature. After the pressure and temperature increase, the gas is discharged from the boosted gas outlet 14. The hot high-pressure gas containing moisture and impurities enters the first plate-fin heat exchanger 17 from the hot boosted gas inlet 15, and exchanges heat with the low-temperature fluid through multiple first metal plates 16 layers. The gas flows along the channel of the first plate-fin heat exchanger 17, while the cold fluid flows through the other side of the first metal plate 16. In this process, heat is transferred to the gas through the first metal plate 16, thereby cooling the gas. The gas is cooled and discharged from the cold boost gas outlet 18, and is transported to the gas flow control system through a pipeline and enters the adsorption tower 3 through the ball valve 21. The desorption material in the adsorption tower 3 removes part of the moisture and impurities in the body and discharges part of the impurities accumulated in the equipment from the first sewage outlet 32 ​​to the sewage pipe. The purified gas with moisture and impurities removed is output to the lower-level equipment through the ball valve 27, wherein part of the purified gas is sucked into the blower 41, and the gas enters from the purified gas inlet 42 and is discharged through the purified gas outlet 43 and is transported to the second plate-fin heat exchanger 44 through a pipeline. The gas enters from the cold gas inlet 45, exchanges heat with the high-temperature fluid through multiple second metal plates 46, and the gas flows along the channel of the second plate-fin heat exchanger 44, while the hot fluid flows through the other side of the second metal plate 46. In this process, heat is transferred to the gas through the second metal plate 46, thereby heating the gas. The heated gas is discharged from the hot gas outlet 47, flows through the pipeline through the ball valve 26 and enters the regeneration tower. The heated gas enters the regeneration tower 5 from the hot purified gas inlet 51. The adsorption material that has adsorbed impurities in the regeneration tower 5 is desorbed due to the high temperature of the hot purified gas, and the adsorption material regenerates the adsorption effect. At the same time, most of the moisture and impurities accumulated in the equipment are discharged from the second sewage outlet 52, and another small part of the impurities re-enter the gas and are discharged from the thermal desorption gas outlet, and flow through the pipeline through the ball valve 24 to enter the thermal desorption gas recovery and filtration system. In system 6, hot gas containing moisture and impurities enters the third plate-fin heat exchanger 62 from the hot gas inlet 61, exchanges heat with the low-temperature fluid through multiple third metal plates 63, and the gas flows along the channel of the third plate-fin heat exchanger 62, while the cold fluid flows through the other side of the third metal plate 63. In this process, heat is transferred to the gas through the third metal plate 63, thereby cooling the gas. The cooled gas is discharged from the cold gas outlet 64 and transported to the filter 65 through a pipeline. When the gas flows into the filter bag 66, the moisture and impurities therein will be filtered out, and the filtered gas flows through the ball valve 21 through the pipeline and re-enters the adsorption tower.

[0047] When the adsorption material in the adsorption tower is consumed too much and the adsorption material regenerated in the regeneration tower 5 is sufficient, the ball valve 2 22, the ball valve 3 23, the ball valve 5 25 and the ball valve 8 28 are opened, the ball valve 1 21, the ball valve 4 24, the ball valve 6 26 and the ball valve 7 27 are closed, and the gas flows as follows: Figure 2 shown.

[0048] At this time, the adsorption tower 3 plays a regeneration role, and the regeneration tower 5 plays an adsorption role. The high-pressure gas is transported into the gas flow control system by the first-level boosting system, flows through the pipeline through the ball valve 22 and enters the regeneration tower 5 for purification. The purified gas flows through the pipeline through the ball valve 28 and partially enters the purified gas recovery system 4. The gas heated by the second plate-fin heat exchanger 44 flows through the pipeline through the ball valve five 25 and enters the adsorption tower from the purified gas outlet 33 for desorption. After the thermal desorption gas flows through the pipeline through the ball valve three 23 and enters the desorption gas cooling and filtration system 6, and after cooling and filtration, it flows through the pipeline through the ball valve two 22 and re-enters the regeneration tower.

[0049] Most of the high-pressure gas enters the downstream equipment after drying and purification, and part of it is recovered by the pressure compensation system.

[0050] The pressure compensation system includes a compensating centrifugal compressor 71, a recovered pressurized gas inlet 72, a compressor impeller 73, a compensating gas outlet 74, a pressure sensor 76, a pressure measuring end 75, a pressure signal output end 77, a PLC 78, a frequency converter 79, and a variable frequency motor 791.

[0051] The high-pressure gas is dried and purified and transported through a pipeline to the recovery boost gas inlet 72, and then enters the compensating centrifugal compressor 71. It is thrown out from the center to the outside by the high-speed rotating compressor impeller 73 to obtain kinetic energy. Then, when passing through the gradually expanding volute, the flow rate of the gas slows down due to the gradual expansion of the channel. When the gas flow rate decreases, part of the kinetic energy is converted into pressure energy, thereby causing an increase in pressure and temperature. After the pressure and temperature are increased, the gas is sent out from the compensating gas outlet and re-transported through a pipeline to the hot boost gas inlet 15. The speed and start and stop of the compensating centrifugal compressor are jointly controlled by the pressure sensor 76, PLC78, frequency converter 79 and variable frequency motor 791. The pressure measuring end 75 of the pressure sensor 76 is connected to the hot boost gas inlet 15. The pressure signal is converted into an analog signal through the pressure signal output end 77 and output to the PLC78. The program built in the PLC78 outputs the analog signal to the frequency converter 79 according to the received pressure signal. The frequency converter 79 adjusts the frequency and voltage output to the variable frequency motor 791 according to the received signal. The variable frequency motor 791 changes the speed or start and stop of the compensating centrifugal compressor 71 according to the changes in the output frequency and voltage of the frequency converter 79. When the pressure sensor 76 detects that the compensated system pressure reaches the critical value, the built-in program of the PLC78 will change the signal output to the frequency converter 79 according to the measurement signal. After receiving the PLC78 signal, the frequency converter 79 changes the frequency and voltage output to the variable frequency motor. The variable frequency motor 791 controls the centrifugal compressor 71 to slow down or stop working. When the system pressure is normal, the compensating centrifugal compressor 71 resumes normal operation.

[0052] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A pressure-stabilized pressurized gas purification system, characterized in that: It comprises a primary pressurizing system (1), an adsorption tower (3), a regeneration tower (5), a gas flow control system (2), a purified gas recovery system (4), a thermal desorption gas cooling and filtering system (6), and a pressure compensation system (7); The primary pressurizing system (1) is used to deliver high-pressure gas to the entire system; the adsorption tower (3) is used to adsorb moisture and impurities in the gas; the gas flow control system (2) is connected to the adsorption tower (3) and is used to deliver purified gas; the regeneration tower (5) is used to perform thermal desorption on the adsorption material in the adsorption tower (3); the gas flow control system (2) is connected to the regeneration tower (6) and is used to deliver the gas after thermal desorption; the pressure compensation system (7) is connected to the gas flow control system (2) and is used to recover part of the high-pressure gas that has undergone the primary pressurizing and drying purification treatment for secondary pressurization.

2. The pressure-stabilized boosted gas purification system according to claim 1, characterized in that: The primary boosting system (1) comprises a main centrifugal compressor (11) for performing a first gas boosting and a first plate-fin heat exchanger (17) for performing cooling; the gas flow control system (2) comprises a spherical valve 1 (21), a spherical valve 2 (22), a spherical valve 3 (23), a spherical valve 4 (24), a spherical valve 5 (25), a spherical valve 6 (26), a spherical valve 7 (27), and a spherical valve 8 (28) for adjusting the gas flow; the spherical valve 1 (21) is connected to the pre-purification gas inlet (31), the spherical valve 3 (23), the cold boosting gas outlet (18), and the spherical valve 2 (22) through a pipeline; the spherical valve 2 (22) is connected to the spherical valve 1 (21), the spherical valve 4 (24), and the thermal desorption gas outlet (53) through a pipeline; the spherical valve 3 (23) is connected to the spherical valve 1 (21), the spherical valve 4 (24), and the thermal desorption gas outlet (53) through a pipeline The spherical valve 4 (24) is connected to the spherical valve 3 (23) and the spherical valve 2 (22) through a pipeline; the spherical valve 5 (25) is connected to the spherical valve 6 (26), the spherical valve 7 (27) and the hot gas outlet (47) through a pipeline; the spherical valve 6 (26) is connected to the spherical valve 5 (25) and the spherical valve 8 (28) through a pipeline; the spherical valve 7 (27) is connected to the spherical valve 8 (28), the purified gas outlet (33), the purified gas inlet (42) and the recovered pressurized gas inlet (72) through a pipeline; the spherical valve 8 (28) is connected to the spherical valve 7 (27), the spherical valve 6 (26) and the hot purified gas inlet (51) through a pipeline.

3. The pressure-stabilized boosted gas purification system according to claim 2, characterized in that: The main centrifugal compressor (11) comprises a gas inlet (12), a compressor impeller (13) and a pressurized gas outlet (14); the first plate-fin heat exchanger (17) comprises a hot pressurized gas inlet (15), a first metal plate (16) and a cold pressurized gas outlet (18); the gas inlet (12) is used for gas to enter the main centrifugal compressor (11); the pressurized gas outlet (14) is connected to the hot pressurized gas inlet (15) and is used to transport the hot pressurized gas into the first plate-fin heat exchanger (17) for cooling; the cold pressurized gas outlet (18) is connected to the gas flow control system (2) and is used to transport high-pressure gas into the regeneration tower (3).

4. The pressure-stabilized boosted gas purification system according to claim 3, characterized in that: The adsorption tower (3) comprises a pre-purification gas inlet (31), a first sewage outlet (32) and a post-purification gas outlet (33); the pre-purification gas inlet (31) is connected to a gas flow control system (2) for conveying pre-purification gas; the first sewage outlet (32) is connected to a sewage pipe for removing moisture and impurities accumulated in the equipment; and the post-purification gas outlet (33) is connected to the gas flow control system (2) for conveying gas.

5. The pressure-stabilized boosted gas purification system according to claim 4, characterized in that: The regeneration tower (5) comprises a heat-purified gas inlet (51), a second sewage outlet (52) and a thermal desorption gas outlet (53); the heat-purified gas inlet (51) is connected to the gas flow control system (2) for conveying the heat-purified gas into the regeneration tower (5); the second sewage outlet (52) is connected to a sewage pipe for removing impurities accumulated in the equipment; the thermal desorption gas outlet (53) is connected to the gas flow control system (2) for conveying gas.

6. The pressure-stabilized boosted gas purification system according to claim 5, characterized in that: The gas flow control system (2) is provided with four inlets and outlets, which are respectively connected to the cold boosted gas outlet (18) of the primary boosting system (1) and the filter (65) of the desorption gas cooling and filtering system (6), the purified gas inlet (42) of the purified gas recovery system (4), the hot gas inlet (61) of the desorption gas cooling and filtering system (6) and the recovered boosted gas inlet (72) of the pressure compensation system (7) and the lower-level equipment.

7. The pressure-stabilized boosted gas purification system according to claim 6, characterized in that: The purification recovery system (4) comprises a blower (41) for recovering part of the purified gas, the blower (41) comprising a purified gas inlet (42) and a purified gas outlet (43); a second plate-fin heat exchanger (44) for heating the recovered gas, the second plate-fin heat exchanger (44) comprising a cold gas inlet (45), a second metal plate (46) and a hot gas outlet (47); the cold gas inlet (45) is connected to the purified gas outlet (43); the hot gas outlet (47) is connected to the gas flow control system (2).

8. The pressure-stabilized boosted gas purification system according to claim 7, characterized in that: The thermal desorption gas cooling and filtering system (6) comprises a third plate-fin heat exchanger (62) for cooling the desorbed hot gas, the third plate-fin heat exchanger (62) comprising a hot gas inlet (61), a third metal plate (63) and a cold gas outlet (64); a filter (65) for filtering the cooling gas; the hot gas inlet (61) is connected to the gas flow control system (2); the cold gas outlet (64) is connected to the filter (65), and the filter (65) comprises a filter bag (66).

9. The pressure-stabilized boosted gas purification system according to claim 8, characterized in that: The pressure compensation system comprises a compensating centrifugal compressor (71) for recovering pressurized gas for secondary supercharging, the compensating centrifugal compressor (71) comprising a recovered pressurized gas inlet (72), a compressor impeller (73) and a compensating gas outlet (74); a pressure sensor (76) for measuring the pressure of high-pressure gas after compensation and before cooling, the pressure sensor (76) comprising a pressure measuring end (75) and a pressure signal output end (77); a PLC (78) for receiving a signal from the pressure sensor (76); a frequency converter (79) for controlling the speed of the variable frequency motor; a variable frequency motor (791) for controlling the start and stop of the compensating centrifugal compressor (71); the recovered pressurized gas inlet (12) is connected to the gas flow control system (2); the compensating gas outlet (74) is connected to the front of the hot pressurized gas inlet (15); and the pressure sensor (76) is connected to the front of the hot pressurized gas inlet (15).

10. A working method of the pressure-stabilized boosted gas purification system according to any one of claims 1 to 9, characterized in that: The steps include: S1: The gas to be pressurized and dried and purified is transported to the gas inlet (12) through a pipeline and enters the main centrifugal compressor (11). The gas is thrown outward from the center by the high-speed rotating impeller (13) to obtain kinetic energy and then passes through the gradually expanding volute to convert part of the kinetic energy into pressure energy. After the pressure is increased, the gas is sent out from the pressurized gas outlet (14); the pressurized gas is transported to the first plate-fin heat exchanger (17) through a pipeline for cooling; S2: The cooled gas is transported to the adsorption tower (3) through a pipeline. The adsorption material in the adsorption tower removes moisture and impurities in the gas and then sends the gas out from the purified gas outlet (33). Impurities accumulated in the equipment are discharged from the sewage outlet (52); S3: The purified gas is transported to the lower-level equipment through a pipeline, wherein part of the purified gas is recovered by the blower (4) and the compensating centrifugal compressor (71); S4: The partially purified gas recovered by the blower (4) is transported to the second plate-fin heat exchanger (44) through a pipeline for heating. The heated gas is transported to the regeneration tower (5) through a pipeline. The adsorption material that has adsorbed moisture and impurities in the regeneration tower is desorbed from the impurities by the high temperature effect of the heated gas, so that the adsorption material is regenerated and the gas is output from the thermal desorption gas outlet (53). The solid impurities accumulated inside the equipment are discharged from the second sewage outlet (52); S5: The thermal desorption gas is transported to the third plate-fin heat exchanger (62) through a pipeline for cooling and then the gas is sent out from the cold desorption gas outlet (64); S6: The cold desorbed gas is transported to the filter (65) via a pipeline, and after being filtered by a filter bag (66), the gas is re-transported into the entire system; S7: The pressure measuring end of the pressure sensor (79) is connected to the hot pressurized gas inlet (15), and the measured pressure is converted into an analog signal and transmitted to the PLC (78) through the signal output end; S8: The PLC (78) converts the analog signal output by the pressure sensor (79) into an analog signal according to program settings and outputs it to the frequency converter (79); S9: The frequency converter (79) uses the analog signal output by the PLC (78) to adjust the output frequency and voltage; S10: The variable frequency motor (791) receives the output frequency and voltage of the frequency converter (79) to control the speed and start and stop of the compensation centrifugal compressor (71); S11: Most of the purified gas sent out from the purified gas outlet (33) is sent to the downstream equipment, and part of the gas is transported to the recovery boost gas inlet (72) through a pipeline, enters the compensating centrifugal compressor (71), is thrown out from the center to the outside by the high-speed rotating impeller (73), and then passes through the gradually expanding volute to convert part of the kinetic energy into pressure energy. After the pressure is increased, the gas is sent out from the boost gas outlet (74) and re-transported to the hot boost gas inlet (15) through a pipeline.

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