Gas purification equipment, gas purification system and method

Abstract

The invention discloses gas purification equipment, a gas purification treatment system and a gas purification treatment method. The gas purification equipment comprises a process strengthening reactor, an auxiliary motor, a clutch and a pressure energy recoverer, the process enhanced reactor comprises a shell, a gas inlet, a gas outlet, a liquid inlet, a liquid outlet, a liquid distributor, a rotor assembly and a driving shaft, the pressure energy recoverer comprises a shell, a liquid inlet, a liquid outlet, a power impeller and a rotating shaft; a driving shaft of the process strengthening reactor, the auxiliary motor, the clutch and a transmission shaft of the pressure energy recoverer are coaxially connected in sequence; and a liquid outlet of the process strengthening reactor is communicated with a liquid inlet of the pressure energy recoverer through a pipeline. The process strengthening equipment is used for strengthening the gas-liquid mass transfer process, the gas absorption and purification effect is improved, meanwhile, the use amount of an absorption solvent is reduced, and the regeneration load and the energy consumption of a circulating system are reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of process intensification, and relates to a process intensification reactor, in particular to a gas purification device and a gas purification treatment system and method for gas-liquid mass transfer intensification. Background Art

[0002] In the process of petrochemical production and natural gas processing, there are many gas treatments under medium and high pressure conditions, such as the removal of acidic components such as hydrogen sulfide and carbon dioxide from catalytic / coking dry gas, circulating hydrogen, hydrogenation low-fraction gas and other logistics in refining enterprises, and the desulfurization and decarbonization treatment in natural gas purification. At present, the above processes generally adopt the mature alcohol amine absorption process, that is, the "amine liquid absorption-amine liquid regeneration" complete set of technology, and the absorbent is mainly alkaline aqueous solution such as DEA, MEA, MDEA, DEPA, etc. The typical absorption and regeneration process is that the raw gas enters the absorption tower from the bottom of the absorption tower, and contacts with the solution left from the top of the tower in the packing layer in reverse, the acid gas in the gas phase is absorbed by the absorbent, and the tail gas after absorption is discharged from the top of the tower to the separator, and the rich liquid after absorbing the acid gas enters the regeneration tower, and the lean liquid enters the absorption tower from the top of the absorption tower after passing through the cooler. The rich liquid is thermally regenerated in the regeneration tower, releasing the acid gas, and is discharged from the top of the regeneration tower. After cooling by the cooler, the acid gas is discharged from the system.

[0003] At present, the following problems are common in the amine liquid absorption and regeneration process. First of all, the above absorption process generally adopts tower equipment, that is, it is carried out in a packed tower / plate tower. The factors affecting the absorption effect mainly include: mass transfer efficiency, absorption liquid concentration, absorption liquid volume, absorption liquid temperature and absorption liquid foaming degree. Traditional absorption towers have disadvantages such as poor mass transfer effect, uneven gas-liquid flow, high resistance, easy plugging of fillers and unstable operation. In addition, due to impurities such as light hydrocarbon droplets and rust entrained in the gas, the absorption liquid will have serious foaming phenomena, which seriously affects the long-term, safe and stable operation of the desulfurization device. At the same time, due to the low desulfurization efficiency of the absorption tower, the content of acidic components in the rich liquid is far lower than the equilibrium value. Therefore, in order to ensure the treatment effect, the amount of amine liquid is often large, the regeneration load is large, and the energy consumption is high. Therefore, the development of high-efficiency absorption equipment and treatment processes, while ensuring the absorption and purification effect, reduces the amount of solvent, reduces the regeneration load and the energy consumption of the circulation system, and improves the foaming phenomenon of the solvent absorption system, is of great significance for improving the treatment effect of such gases and saving energy and reducing consumption.

[0004] Patent CN112159695A discloses an energy-saving natural gas MDEA decarbonization system and method, which improves the thermal grade by pressurizing the analytical gas output from the top of the regeneration tower and uses it to heat the rich amine liquid entering the regeneration tower, so that the low-grade heat can be reasonably recycled. However, this technology requires the addition of analytical gas compressor equipment, which increases power consumption. In addition, the absorption-regeneration process uses tower equipment, which still has problems such as low mass transfer efficiency, low absorption liquid concentration, large absorption liquid consumption, and easy foaming of the absorption liquid.

[0005] As a highly efficient process intensification equipment, the ultra-gravity reactor can achieve mass transfer process intensification through centrifugal force. Compared with the traditional mass transfer method, the mass transfer efficiency can be improved by an order of magnitude. It has the advantages of high efficiency, small equipment size, easy operation and convenient equipment maintenance. At present, ultra-gravity technology has been applied in engineering in the fields of selective H2S removal, flue gas desulfurization and dust removal, nano-powder preparation, extraction, and distillation. In addition to its efficient purification effect, this technology can also eliminate the foaming of amine liquid when used in the amine liquid absorption system. It can increase the concentration of amine liquid to a certain extent, thereby reducing the circulation volume of amine liquid, greatly reducing the regeneration load of amine liquid and the energy consumption of the circulation system. However, the drive of the ultra-gravity reactor bed (rotor) of this technology requires a motor to provide power, which increases the energy consumption problem.

[0006] Patent CN105385479A discloses a super-gravity desulfurization and decarbonization device that integrates the hydrate method and the membrane method. By combining the hydrate method with the membrane separation method and introducing super-gravity technology on this basis, the natural gas is deeply desulfurized and deacidified, which greatly improves the removal rate of acid gases such as H2S and CO2 in the natural gas. The upper part of the device is a super-gravity membrane separation unit, and the lower part of the device is a stirred hydrate reactor. The overall structure is complex, and the rotating parts of the super-gravity steering mechanism and the magnetic stirring of the stirred hydrate reactor both need to be driven by electric motors, which increases power consumption. Summary of the invention

[0007] In view of the shortcomings of the prior art, the present invention provides a gas purification device, a gas purification system and a method. Through a process intensification device, the system energy is recovered for the intensification of the gas-liquid process, the gas absorption and purification effect is improved, the absorption solvent usage is reduced, the regeneration load and the energy consumption of the circulation system are reduced, the long-term, safe and stable operation of the device is ensured, and the gas purification treatment is realized efficiently and at a low cost.

[0008] To achieve the above objectives, a first aspect of the present invention provides a gas purification device.

[0009] The gas purification equipment of the present invention comprises: a process intensification reactor, an auxiliary motor, a clutch, and a pressure energy recovery device; The process intensification reactor comprises a shell, an air inlet, an exhaust port, a liquid inlet, a liquid outlet, a liquid distributor, a rotor assembly and a drive shaft; The pressure energy recovery device comprises a shell, a liquid inlet, a liquid outlet, a power impeller and a rotating shaft; the driving shaft, the auxiliary motor, the clutch and the transmission shaft of the pressure energy recovery device are coaxially connected in sequence; The liquid discharge port of the process intensification reactor is connected with the liquid inlet of the pressure energy recovery device through a pipeline.

[0010] Furthermore, in the above-mentioned gas purification equipment, the rotor structure of the rotor assembly can be a packing type, a disc type, a spiral type, a baffle type or a composite type, and the rotor assembly is mounted on a drive shaft.

[0011] Furthermore, in the above-mentioned gas purification equipment, the inlet of the liquid distributor is connected to the liquid inlet of the process intensification reactor, and the liquid distributor is arranged at the center of the rotor.

[0012] Furthermore, in the above-mentioned gas purification equipment, the air inlet of the process intensification reactor is arranged in the middle of the shell, and the center of the inlet is radially horizontal to the rotor assembly; the air outlet of the process intensification reactor is arranged in the upper part of the shell; the liquid inlet of the process intensification reactor is arranged in the upper part of the shell; the liquid discharge port of the process intensification reactor is arranged in the lower part of the shell, specifically below the rotor assembly.

[0013] Furthermore, in the above-mentioned gas purification equipment, the power impeller may be a single-stage or multi-stage impeller, and the power impeller is evenly arranged along the circumference and installed on the transmission shaft.

[0014] Furthermore, in the above-mentioned gas purification equipment, the liquid inlet of the pressure energy recovery device is arranged on the side of the shell, and the center of the inlet is radially horizontal with the power impeller assembly; the liquid discharge port of the pressure energy recovery device is located at the lower part or bottom of the shell.

[0015] Furthermore, in the above-mentioned gas purification equipment, when the drive shaft, auxiliary motor, clutch of the process intensification reactor and the transmission shaft of the pressure energy recovery device are connected, a coupling can be optionally provided between the devices for coaxial connection.

[0016] Furthermore, in the above-mentioned gas purification equipment, a transmission may be optionally provided between the drive shaft of the process intensification reactor and the auxiliary motor.

[0017] Furthermore, in the above-mentioned gas purification equipment, the auxiliary motor is used as the first drive of the process intensification reactor rotor assembly, and the pressure energy recoverer is used as the second drive of the rotor assembly. When the speed of the power impeller reaches or exceeds the speed of the motor, the clutch engages, the pressure energy recoverer starts to work on the motor, and drives the rotor assembly to rotate at the same time as the motor, thereby utilizing the strong centrifugal force field generated by the rotation of the rotor to achieve the enhancement of the gas-liquid mass transfer process.

[0018] Furthermore, in the above-mentioned gas purification equipment, a sealing component is arranged between the rotating component and the shell to ensure that there is no leakage in the relevant area.

[0019] Furthermore, the gas purification equipment of the present invention is suitable for gas purification treatments such as gas desulfurization, gas decarbonization, natural gas absorption dehydration, circulating hydrogen desulfurization and selective desulfurization of hydrogen under certain pressure conditions, and can also be used for enhanced treatment of gas-liquid processes under other pressurized conditions, and is particularly suitable for the field of gas treatment in absorption-regeneration processes with certain pressure drop conditions.

[0020] According to a second aspect of the present invention, the present invention provides a gas purification system, in which the above-mentioned gas purification device is applied.

[0021] The gas purification system of the present invention comprises a gas purification device, a flash tank, a lean-rich liquid heat exchanger, a regeneration tower, a lean liquid pump, a lean liquid cooler and a filtration system; The gas inlet of the gas purification device is connected to the raw gas pipeline, the gas outlet of the gas purification device is connected to the external gas pipeline, the liquid inlet of the gas purification device is connected to the filter outlet, and the liquid outlet of the gas purification device is connected to the liquid inlet of the flash tank; The liquid outlet of the flash tank is connected to the liquid inlet of the regeneration tower via a lean-rich liquid heat exchanger; The gas phase outlet of the regeneration tower is connected to the regeneration gas pipeline, and the liquid phase outlet of the regeneration tower is connected to the inlet of the lean liquid cooler after passing through the lean liquid pump and the lean-rich liquid heat exchanger in sequence; The outlet of the lean liquid cooler is connected to the inlet of the filtering system.

[0022] Furthermore, the lean-rich liquid heat exchanger is a liquid-liquid heat exchanger, and the form of the heat exchanger is not limited.

[0023] Furthermore, a condenser is provided at the top of the regeneration tower, and a reboiler is provided at the bottom of the tower.

[0024] Furthermore, the liquid discharge port of the process intensification reactor of the gas purification equipment is connected to the liquid inlet of the pressure energy recoverer.

[0025] According to a third aspect of the present invention, the present invention provides a gas purification method, wherein the gas purification system described above is applied.

[0026] A gas purification method comprises the following steps: (1) The gas to be treated first enters the process intensification reactor of the gas purification equipment through the gas inlet. The gas contacts the lean absorption liquid from the liquid distributor in the rotor assembly area, undergoes an intensified gas-liquid two-phase mass transfer process and performs gas absorption. The treated gas is discharged from the reactor, and the lean absorption liquid that absorbs the components to be treated becomes rich absorption liquid and is discharged from the discharge port of the process intensification reactor. (2) The rich absorbent discharged in step (1) enters the pressure energy recovery device of the gas purification equipment. In the pressure energy recovery device, the pressure energy of the rich absorbent is converted into kinetic energy, which impacts the power impeller and drives the impeller to rotate, thereby driving the transmission shaft to rotate. When the speed of the power impeller reaches or exceeds the speed of the motor, the transmission shaft engages with the clutch, and the pressure energy recovery device starts to work on the motor, driving the rotor assembly to rotate at the same time as the motor, and the depressurized fluid enters the flash tank from the discharge port of the pressure energy recovery device; (3) The rich absorbent entering the flash tank in step (2) flashes off the dissolved hydrocarbons and then passes through the lean-rich liquid heat exchanger to be heated and enter the regeneration tower. In the regeneration tower, the rich absorbent is heated and decomposed to release the absorbed components to become lean absorbent, completing the regeneration of the absorbent. The high-concentration component gas released by the regeneration is subsequently treated. The regenerated lean absorbent is pressurized by a lean liquid pump, cooled by a lean-rich liquid heat exchanger, cooled by a lean liquid cooler, and filtered by a filtration system before being returned to the process intensification reactor for recycling.

[0027] Furthermore, the gas to be treated in step (1) may be natural gas, liquefied gas, dry gas, low-fraction gas or circulating hydrogen for the purpose of removing acidic components such as H2S and CO2, or may be natural gas or other gas for the purpose of removing moisture, and the components to be treated are H2S, CO2 and H2O respectively.

[0028] Furthermore, the operating pressure of the gas purification equipment in step (1) is 0.5-20 MPa, and the operating temperature can be determined according to the specific treatment system.

[0029] Furthermore, the rotation speed of the rotor assembly in step (1) is 50 to 5000 rpm, preferably 200 to 2000 rpm.

[0030] Furthermore, in step (2), the motor speed is 50 to 3000 rpm, preferably 200 to 1000 rpm.

[0031] Furthermore, the operating pressure of the regeneration tower in step (3) is 0.1-15 MPa, which is lower than the operating pressure of the process intensification reactor, and the operating pressure difference is 0.4 MPa-20 MPa. The operating temperature can be determined and adjusted according to the specific treatment system.

[0032] A gas purification method of the present invention can be used in absorption-regeneration gas treatment fields with certain pressure drop conditions such as gas desulfurization, gas decarbonization, natural gas absorption dehydration, circulating hydrogen desulfurization and selective dehydrogen sulfide, such as amine liquid desulfurization, amine liquid decarbonization, MDEA selective dehydrogen sulfide, natural gas glycol dehydration and other processes.

[0033] Compared with the prior art, the present invention has the following advantages: 1. Compared with the existing ultra-gravity rotating bed equipment, the present invention fully utilizes the pressure energy of the pressurized fluid, uses the auxiliary motor as the first drive of the rotor assembly, and the pressure energy recovery device as the second drive of the rotor assembly. When the speed of the power impeller reaches or exceeds the speed of the motor, the clutch engages, and the pressure energy recovery device starts to work on the motor, and drives the rotor assembly to rotate at the same time as the motor, providing a powerful centrifugal field for the process intensification reaction unit, greatly enhancing the gas-liquid two-phase mass transfer process, promoting the gas absorption effect, and reducing the power consumption of the motor, thereby achieving energy-saving effects.

[0034] 2. Compared with the existing tower equipment, the reactor of the present invention greatly strengthens the mass transfer process, the equipment volume and floor space are greatly reduced, the infrastructure and equipment investment are saved, and it has the advantages of convenient inspection and maintenance, easy start and stop. The process intensification reactor of the present invention can not only ensure the efficient treatment effect of the gas, but also eliminate the foaming of the absorption liquid treatment system, and can increase the concentration of the absorption liquid to a certain extent. For example, the concentration of the amine liquid used in the amine desulfurization can be increased from the conventional 30% to 50%, thereby reducing the circulation amount of the amine liquid, greatly reducing the amine liquid regeneration load and the energy consumption of the circulation system.

[0035] 3. The present invention fully recovers the pressure energy of the pressurized rich absorption liquid before depressurizing and regenerating it and uses it as energy to drive the rotor assembly, thereby strengthening the absorption process. It not only utilizes the advantages of supergravity equipment to solve the problems of traditional tower equipment, but also utilizes the system pressure energy to solve the motor energy consumption problem of the supergravity reactor, thereby realizing gas treatment with high efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a schematic diagram of a gas purification device according to the present invention.

[0037] In the figure, 1-process intensification reactor, 2-auxiliary motor, 3-clutch, 4-pressure energy recovery device, 5-reactor shell, 6-air inlet, 7-exhaust port, 8-liquid inlet of process intensification reactor, 9-liquid discharge port of process intensification reactor, 10-liquid distributor, 11-rotor assembly, 12-rotor drive shaft, 13-liquid inlet of pressure energy recovery device, 14-liquid discharge port of pressure energy recovery device, 15-power impeller, 16-rotating shaft, 17-coupling, 18-sealing component.

[0038] Figure 2 This is a schematic diagram of a gas purification system described in the present invention.

[0039] In the figure, 51-raw gas pipeline, 52-gas purification equipment, 53-exhaust gas pipeline, 54-filter, 55-flash tank, 56-rich absorption liquid pipeline, 57-lean and rich liquid heat exchanger, 58-regeneration tower, 59-regeneration gas pipeline, 60-lean liquid pump, 61-lean absorption liquid pipeline, 62-lean liquid cooler, 63-process intensification reactor discharge pipeline, 64-flash gas pipeline. DETAILED DESCRIPTION

[0040] The gas purification device, gas purification system and method of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments, but the present invention is not limited thereby. Example 1

[0041] This embodiment describes in detail a gas purification device of the present invention. Figure 1 As shown, a gas purification device of the present invention has the following structure: The gas purification equipment includes a process intensification reactor 1, an auxiliary motor 2, a clutch 3, and a pressure energy recovery device 4; the process intensification reactor 1 includes a shell 5, an air inlet 6, an exhaust port 7, a liquid inlet 8, a liquid discharge port 9, a liquid distributor 10, a rotor assembly 11, and a drive shaft 12; the pressure energy recovery device 4 includes a liquid inlet 13, a liquid discharge port 14, a power impeller 15, and a rotating shaft 16; the drive shaft 16 of the process intensification reactor 1, the auxiliary motor 2, the clutch 3, and the transmission shaft 16 of the pressure energy recovery device 4 are coaxially connected in sequence; The liquid discharge port 7 of the process intensification reactor 1 is connected to the liquid inlet 13 of the pressure energy recovery device 4 through a pipeline; the rotor assembly 11 is installed on the driving shaft 12; the inlet of the liquid distributor 10 is connected to the liquid inlet 8 of the process intensification reactor 1, and the liquid distributor 10 is arranged at the center of the rotor assembly 11; the air inlet 6 of the process intensification reactor 1 is arranged in the middle of the shell, and the center of the inlet is radially horizontal with the rotor assembly 11, the air outlet 7 is arranged at the upper part of the shell, the liquid inlet 8 is arranged at the upper part of the shell, and the liquid discharge port 9 is arranged at the upper part of the shell. It is arranged at the lower part of the shell, specifically at the lower part of the rotor assembly 11; the power impeller 15 is evenly arranged along the circumference and installed on the transmission shaft 16; the liquid inlet 13 of the pressure energy recovery device 4 is arranged on the side of the shell, and the center of the inlet is radially horizontal with the power impeller assembly 15; the discharge port 14 of the pressure energy recovery device 4 is located at the lower part or bottom of the shell; when the drive shaft 16, the auxiliary motor 2, the clutch 3 of the process intensification reactor 1 and the transmission shaft 16 of the pressure energy recovery device 4 are coaxially connected in sequence, the coupling 17 can be optionally set between the devices. shaft connection; a transmission 3 can be optionally arranged between the driving shaft 16 of the process intensification reactor 1 and the auxiliary motor 2; when the above-mentioned gas purification equipment is working, the auxiliary motor 2 is used as the first drive of the rotor assembly 11 of the process intensification reactor, and the pressure energy recovery device 4 is the second drive of the rotor assembly. When the speed of the power impeller reaches or exceeds the speed of the motor, the clutch 3 is engaged, and the pressure energy recovery device 4 starts to work on the motor 2, and drives the rotor assembly 11 to rotate simultaneously with the motor 2, and utilizes the strong centrifugal force field generated by the rotation of the rotor to realize the enhancement of the gas-liquid mass transfer process. Example 2

[0042] This embodiment describes a gas purification system of the present invention in detail.

[0043] like Figure 2As shown, the present invention provides a gas purification system, in which the gas purification device described above is applied. The gas purification system comprises a gas purification device 52, a flash tank 55, a lean-rich liquid heat exchanger 57, a regeneration tower 58, a lean liquid pump 60, a lean liquid cooler 62 and a filtering system 54; the gas inlet of the gas purification device 52 is connected to the raw gas pipeline 51, the gas outlet of the gas purification device 52 is connected to the external exhaust gas pipeline 53, the liquid inlet of the gas purification device 52 is connected to the outlet of the filter 54, and the liquid outlet of the gas purification device 52 is connected to the liquid inlet of the flash tank 55; the liquid outlet of the flash tank 55 is connected to the liquid inlet of the regeneration tower 58 via the lean-rich liquid heat exchanger 57; the gas phase outlet of the regeneration tower 58 is connected to the regeneration gas pipeline 59, and the liquid phase outlet of the regeneration tower 58 is connected to the inlet of the lean liquid cooler 62 after passing through the lean liquid pump 60 and the lean-rich liquid heat exchanger 57 in sequence; the outlet of the lean liquid cooler 62 is connected to the inlet of the filtering system 54; the liquid discharge port 9 of the process intensification reactor 1 of the gas purification device 52 is connected to the liquid inlet 13 of the pressure energy recoverer 4. Example 3

[0044] This embodiment describes the gas purification method of the present invention in detail. Figure 1-2 The working process of a gas purification system and method provided by the present invention is as follows: The gas to be treated first enters the process intensification reactor 1 of the gas purification equipment 52 through the air inlet 51. The gas contacts the lean absorption liquid from the liquid distributor 10 in the rotor assembly 11 area to perform an intensified process of gas-liquid two-phase mass transfer and gas absorption. The treated gas is discharged from the reactor, and the lean absorption liquid that has absorbed the components to be treated becomes rich absorption liquid and is discharged from the discharge port 9 of the process intensification reactor 1; the discharged rich absorption liquid enters the pressure energy recovery device 4 of the gas purification equipment 52. In the pressure energy recovery device 4, the pressure energy of the rich absorption liquid is converted into kinetic energy, which impacts the power impeller 15 and drives the impeller to rotate, thereby driving the transmission shaft 16 to rotate. When the number of revolutions of the power impeller 15 reaches or exceeds the number of revolutions of the motor, the transmission The shaft 16 is meshed with the clutch 3, and the pressure energy recovery device 4 starts to work on the motor 2, and drives the rotor assembly 11 to rotate simultaneously with the motor 2. The fluid after depressurization enters the flash tank 55 from the discharge port 14 of the pressure energy recovery device 4; the rich absorption liquid entering the flash tank 55 flashes out the dissolved hydrocarbons, and then passes through the lean-rich liquid heat exchanger 57 to be heated and enter the regeneration tower 58. In the regeneration tower 58, the rich absorption liquid is heated and decomposed to release the absorbed components to become lean absorption liquid, completing the regeneration of the absorption liquid. The high-concentration component gas 59 released by the regeneration is subsequently processed. The regenerated lean absorption liquid is pressurized by the lean liquid pump 60, cooled by the lean-rich liquid heat exchanger 57, cooled by the lean liquid cooler 62, and filtered by the filtration system 54, and then returned to the process intensification reactor 1 for recycling. Example 4

[0045] This embodiment provides a specific application example of a gas purification system of the present invention.

[0046] use Figure 1 The present invention provides a gas purification device, and uses Figure 2 A gas purification system shown in the figure desulfurizes the dry gas from a refinery of a certain enterprise. The H2S concentration in the dry gas is about 0.4% (V). The desulfurizer is N-methyldiethanolamine (MDEA), with a mass concentration of 45% (w), an absorption pressure of 1.5 MPa, an absorption temperature of 40°C, a regeneration pressure of 0.6 MPa, and a regeneration temperature of 120°C. The sulfur-containing dry gas first enters the process intensification reactor 1 of the gas purification equipment 52, and contacts with lean methyldiethanolamine in the rotor assembly 11 area to perform an intensified process of gas-liquid two-phase mass transfer and absorb H2S gas. The purified gas is discharged from the reactor 52, and the lean absorption liquid that absorbs the H2S component becomes a rich absorption liquid, and enters the pressure energy recovery device 4 of the gas purification equipment 52 from the process intensification unit 1. In the pressure energy recovery device 4, the rich absorption liquid is reduced in pressure from 1.5 MPa to about 0.8 MPa, and the pressure energy of the rich absorption liquid is converted into kinetic energy. The power impeller 15 drives the impeller to rotate, thereby driving the transmission shaft 16 to rotate, and controlling the rotation speed of the rotor assembly to be about 800 revolutions per minute (rpm), which can achieve that the H2S concentration in the treated circulating hydrogen is less than 10 mg / m3. The fluid after decompression to 0.8 MPa enters the flash tank 55 from the discharge port 14 of the pressure energy recoverer 4, flashes out the dissolved hydrocarbons, and then passes through the lean-rich liquid heat exchanger 57 to be heated and enter the regeneration tower 58. In the regeneration tower, the rich absorption liquid is heated and decomposed to release the absorbed H2S gas to become the lean absorption liquid, completing the absorption liquid regeneration and recycling.

[0047] Comparative Example 1 The same as Example 1, except that the circulating hydrogen desulfurization equipment adopts traditional tower equipment, and the entire process of gas-liquid contact in the traditional tower is carried out under normal gravity field. Due to the limitation of the gravity field, the gas-liquid contact flow is slow, and the mass transfer coefficient is not high, resulting in a low mass transfer rate. The content of acidic components in the rich liquid is far lower than the equilibrium value, so it is necessary to increase the amount of absorption liquid. In order to avoid serious foaming of the absorption liquid, the concentration of amine liquid is generally controlled at about 30%. Compared with Example 1, when the same treatment effect is achieved, the amount of amine liquid used and the regeneration energy consumption of this comparative example increase by about 40%.

[0048] Comparative Example 2 The same as Example 1, except that the circulating hydrogen desulfurization equipment adopts conventional supergravity equipment. Since the drive of the bed (rotor) of the traditional supergravity reactor is completely powered by the motor, while in Example 1, the auxiliary motor is used as the first drive of the rotor assembly, and the pressure energy recoverer is the second drive of the rotor assembly, the pressure energy of the pressurized fluid can be fully utilized. Therefore, under the same operating conditions as in Example 1, the operating energy consumption of the traditional supergravity equipment is increased by at least 50%.

Claims

1. A gas purification device, characterized in that: Including process intensification reactor, auxiliary motor, clutch, pressure energy recovery device; The process intensification reactor comprises a shell, an air inlet, an exhaust port, a liquid inlet, a liquid outlet, a liquid distributor, a rotor assembly and a drive shaft; The pressure energy recovery device comprises a shell, a liquid inlet, a liquid outlet, a power impeller and a rotating shaft; the driving shaft, the auxiliary motor, the clutch and the transmission shaft of the pressure energy recovery device are coaxially connected in sequence; The liquid discharge port of the process intensification reactor is connected to the liquid inlet of the pressure energy recovery device through a pipeline.

2. The gas purification device according to claim 1, characterized in that: The rotor structure of the rotor assembly is a packing type, a disc type, a spiral type, a baffle type or a composite type.

3. The gas purification device according to claim 1, characterized in that: The inlet of the liquid distributor is connected to the liquid inlet of the process intensification reactor, and the liquid distributor is arranged at the center of the rotor.

4. The gas purification device according to claim 1, characterized in that: The air inlet of the process intensification reactor is arranged in the middle of the shell, and the center of the inlet is radially horizontal to the rotor assembly; the air outlet of the process intensification reactor is arranged at the upper part of the shell; the liquid inlet of the process intensification reactor is arranged at the upper part of the shell; the liquid discharge port of the process intensification reactor is arranged at the position of the shell below the rotor assembly.

5. The gas purification device according to claim 1, characterized in that: The power impellers are evenly arranged along the circumference and installed on the transmission shaft.

6. The gas purification device according to claim 1, characterized in that: The liquid inlet of the pressure energy recovery device is arranged on the side of the shell, and the center of the inlet is parallel to the radial direction of the power impeller assembly; the liquid discharge port of the pressure energy recovery device is located at the lower part or bottom of the shell.

7. The gas purification device according to claim 1, characterized in that: When the driving shaft, the auxiliary motor, the clutch of the process intensification reactor and the transmission shaft of the pressure energy recovery device are connected, a coupling is selected to be coaxially connected between the devices.

8. The gas purification device according to claim 1, characterized in that: A transmission is arranged between the driving shaft of the process intensification reactor and the auxiliary motor.

9. The gas purification device according to claim 1, characterized in that: The auxiliary motor is used as the first drive of the rotor assembly of the process intensification reactor, and the pressure energy recovery device is used as the second drive of the rotor assembly.

10. The gas purification device according to claim 9, characterized in that: When the speed of the power impeller reaches or exceeds the speed of the motor, the clutch engages, the pressure energy recovery device starts to work on the motor, and drives the rotor assembly to rotate simultaneously with the motor.

11. The gas purification device according to claim 1, characterized in that: A sealing component is arranged between the rotating component and the housing to ensure that there is no leakage in the relevant area.

12. A gas purification system, characterized in that: It contains the gas purification equipment described in any one of claims 1-11.

13. The gas purification system according to claim 12, characterized in that: The gas purification system includes gas purification equipment, a flash tank, a lean and rich liquid heat exchanger, a regeneration tower, a lean liquid pump, a lean liquid cooler and a filtration system; The gas inlet of the gas purification device is connected to the raw gas pipeline, the gas outlet of the gas purification device is connected to the external gas pipeline, the liquid inlet of the gas purification device is connected to the filter outlet, and the liquid outlet of the gas purification device is connected to the liquid inlet of the flash tank; The liquid outlet of the flash tank is connected to the liquid inlet of the regeneration tower via a lean-rich liquid heat exchanger; The gas phase outlet of the regeneration tower is connected to the regeneration gas pipeline, and the liquid phase outlet of the regeneration tower is connected to the inlet of the lean liquid cooler after passing through the lean liquid pump and the lean-rich liquid heat exchanger in sequence; The outlet of the lean liquid cooler is connected to the inlet of the filtering system.

14. The gas purification system according to claim 12, characterized in that: The regeneration tower has a condenser at the top and a reboiler at the bottom.

15. A gas purification method, characterized in that: The gas purification system according to any one of claims 12 to 14 is applied, and the purification method comprises the following steps: (1) The gas to be treated first enters the process intensification reactor of the gas purification equipment through the gas inlet. The gas contacts the lean absorption liquid from the liquid distributor in the rotor assembly area, undergoes an intensified gas-liquid two-phase mass transfer process and performs gas absorption. The treated gas is discharged from the reactor, and the lean absorption liquid that absorbs the components to be treated becomes rich absorption liquid and is discharged from the discharge port of the process intensification reactor. (2) The rich absorbent discharged in step (1) enters the pressure energy recovery device of the gas purification equipment. In the pressure energy recovery device, the pressure energy of the rich absorbent is converted into kinetic energy, which impacts the power impeller and drives the impeller to rotate, thereby driving the transmission shaft to rotate. When the speed of the power impeller reaches or exceeds the speed of the motor, the transmission shaft engages with the clutch, and the pressure energy recovery device starts to work on the motor, driving the rotor assembly to rotate at the same time as the motor, and the depressurized fluid enters the flash tank from the discharge port of the pressure energy recovery device; (3) The rich absorbent entering the flash tank in step (2) flashes off the dissolved hydrocarbons and then passes through the lean-rich liquid heat exchanger to be heated and enter the regeneration tower. In the regeneration tower, the rich absorbent is heated and decomposed to release the absorbed components to become lean absorbent, completing the regeneration of the absorbent. The high-concentration component gas released by the regeneration is subsequently treated. The regenerated lean absorbent is pressurized by a lean liquid pump, cooled by a lean-rich liquid heat exchanger, cooled by a lean liquid cooler, and filtered by a filtration system before being returned to the process intensification reactor for recycling.

16. The gas purification method according to claim 15, characterized in that: The gas to be treated is natural gas, liquefied gas, dry gas, low-content gas or circulating hydrogen containing one or more of H2S, CO2 or water.

17. The gas purification method according to claim 15, characterized in that: The operating pressure of the regeneration tower is 0.4 MPa to 20 MPa lower than the operating pressure of the process intensification reactor.

18. The gas purification method according to claim 15, characterized in that: The operating pressure of the gas purification equipment is 0.5~20MPa, and the operating pressure of the regeneration tower is 0.1~15MPa.

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