Device for producing oxygen with different volume purities by adopting non-low-temperature method and oxygen production method thereof

Abstract

The invention relates to a device for producing oxygen with different volume purities by adopting a non-low-temperature method and an oxygen production method thereof, the device comprises an argon-rich sub-module alpha, a medium-low-purity oxygen enrichment sub-module beta and a high-purity oxygen enrichment sub-module gamma, the argon-rich sub-module alpha, the medium-low-purity oxygen enrichment sub-module beta and the high-purity oxygen enrichment sub-module gamma are mutually connected, the argon-rich sub-module alpha is used for adsorbing oxygen and nitrogen in air with pressure after air separation of a molecular sieve, so that argon-rich air with the volume purity of 10% is obtained; the medium-low-purity oxygen enrichment sub-module beta is used for producing oxygen-enriched air with the volume purity of 93% by taking air with pressure after the molecular sieve is subjected to air separation as a raw material; feed gas of the high-purity oxygen enrichment submodule gamma comes from an outlet of an adsorption tower of the middle-low-purity oxygen enrichment submodule beta, and oxygen with the volume purity of 4-5n is obtained. According to the device, compressed air obtained after an air separation molecular sieve is used as raw material gas for non-low-temperature method oxygen production, and meanwhile pressure nitrogen on the top of an air separation lower tower is used as a low-temperature environment maintaining refrigerant of a non-low-temperature pressure swing adsorption tower.

Description

Technical Field

[0001] This invention relates to an apparatus and method for producing oxygen of different volumes and purities using a non-low temperature method, belonging to the field of air separation oxygen production. Background Technology

[0002] Cryogenic distillation of air is currently the mainstream industrial oxygen production technology, suitable for producing industrial oxygen with a volume purity of not less than 99.5%. Pure oxygen and high-purity oxygen are not cost-effective for producing oxygen with a volume purity not exceeding 90%. Non-cryotherapy oxygen production offers several advantages: 1. Fast product response; 2. Short process flow and high degree of automation; 3. Strong adaptability to feedstock gases, suitable for producing medium to low purity oxygen; 4. High operational flexibility, generally reaching 30-120%, with rapid equipment start-up and shutdown typically taking only 0.5-2 hours; 5. Low energy consumption and low operating costs. Combining these two oxygen production methods allows for real-time, full-coverage production from low-purity oxygen (volume purity ≤60%) to high-purity oxygen (volume purity ≥99.999%) under low-energy consumption conditions. However, there are currently no commercially available devices or methods for producing oxygen of different volume purities using non-cryotherapy. Summary of the Invention

[0003] This invention develops a device and method for producing oxygen of varying purities using a non-cryotherapy approach. It combines traditional cryogenic air separation distillation equipment with a non-cryotherapy pressure swing adsorption (PSA) system to achieve the combined production of oxygen of different purities. The device uses compressed air from the air separation molecular sieve as the feed gas for the non-cryotherapy oxygen production, while nitrogen gas at the top of the lower air separation column is used as the refrigerant to maintain the cryogenic environment of the PSA column. This invention's non-cryotherapy oxygen production device includes an argon-rich submodule α. 、 Medium and low purity oxygen enrichment submodule β 、 The high-purity oxygen enrichment submodule consists of three parts. ， The argon-rich submodule is characterized by α、 The low-to-medium purity oxygen enrichment module β and the high-purity oxygen enrichment module γ are interconnected. The argon-enriched module α uses pressurized air following the air separation molecular sieve as feedstock, adsorbing oxygen and nitrogen to obtain argon-enriched air with a volume purity of ~10%. The low-to-medium purity oxygen enrichment module β uses pressurized air following the air separation molecular sieve as feedstock to produce oxygen-enriched air with a volume purity of ~93%. The feedstock gas for the high-purity oxygen enrichment module γ comes from the outlet of the adsorption tower of the low-to-medium purity oxygen enrichment module β, undergoes catalytic nitrogen removal, and then enters the high-purity oxygen enrichment module γ to adsorb and remove NH4+. + 4. H2O, and other trace amounts of CO, CO2 and hydrocarbons, yield oxygen with a volume purity of 4n to 5n.

[0004] Preferably, the feed gas comes from the air after the molecular sieve separation process. A portion of this air enters the air separation unit, and the remaining portion is connected to the inlet of the first shut-off valve. The outlet of the first shut-off valve is connected to the hot end inlet of the heat exchanger. The hot end outlet of the heat exchanger is simultaneously connected to the inlets of the third and fourth shut-off valves. The outlet of the third shut-off valve is simultaneously connected to the inlets of the eleventh and fifty-third shut-off valves and the adsorption tower. α -1 Inlet; The outlet of the fourth shut-off valve is simultaneously connected to the inlet of the twelfth shut-off valve and the inlet of the fifty-fourth shut-off valve, and the adsorption tower. α -2 inlet, the adsorption tower α -1 outlet is simultaneously connected to the inlet of the seventh shut-off valve and the outlet of the fortieth shut-off valve; Adsorption tower α -2 outlet is simultaneously connected to the inlet of the eighth shut-off valve and the outlet of the forty-first shut-off valve. The outlets of the seventh and eighth shut-off valves are jointly connected to the inlet of the argon-rich air buffer tank. The outlet of the argon-rich air buffer tank is connected to the inlet of the tenth shut-off valve. The outlet of the tenth shut-off valve is connected to other systems. The adsorption tower... α -1 Outlet and Adsorption Tower α The outlets -2 are connected and equipped with a pressure equalization device to ensure a smooth transition when switching between adsorption towers.

[0005] Preferably, the outlets of the eleventh and twelfth shut-off valves are both connected to the inlet of the thirteenth shut-off valve; the outlet of the thirteenth shut-off valve is simultaneously connected to the inlets of the fourteenth, fifteenth, and sixteenth shut-off valves, wherein the outlet of the fourteenth shut-off valve is connected to the adsorption tower. β -1 Inlet, Fiftieth Stop Valve Inlet; Fifteenth Stop Valve Outlet Connects to Adsorption Tower β -2 inlet, inlet of the 51st shut-off valve; outlet of the 16th shut-off valve connected to the adsorption tower. β -3 inlet, 52nd shut-off valve inlet.

[0006] Preferably: the adsorption tower β -1 Outlet connection to the inlet of the 20th shut-off valve and the outlet of the 47th shut-off valve; Adsorption tower β -2 Outlet connection to the inlet of the 21st shut-off valve and the outlet of the 48th shut-off valve; Adsorption tower β -3 outlet connects to the inlet of the 22nd stop valve and the outlet of the 49th stop valve. The inlets of the 47th, 48th, and 49th stop valves are connected to the inlet of the 40th and 41st stop valves, the outlet of the electric heater, the outlet of the 55th stop valve, and the outlet of the 56th stop valve. It should be noted that the outlet of the electric heater is equipped with a thermometer and a pressure sensor.

[0007] Preferably, the outlets of the 20th, 21st, and 22nd shut-off valves are all connected to the inlet of the 23rd and 24th shut-off valves. The outlet of the 23rd shut-off valve is connected to the pure oxygen application, where the oxygen concentration is ~93% (V / V). The outlet of the 24th shut-off valve is connected to the feed gas inlet of the catalytic purification unit. The feed gas outlet of the catalytic purification unit is connected to the hot end inlet of the heat exchanger. The hot end outlet of the heat exchanger is connected to the inlet of the 26th shut-off valve. The outlet of the 26th shut-off valve is connected to the adsorption tower. c -1 Import, Adsorption Tower c -1 Outlet connection to adsorption tower c -2 Inlet, Adsorption Tower c -2 outlet connects to the inlet of the 29th shut-off valve. The outlet of the 29th shut-off valve is connected to the high-purity oxygen application, where the oxygen concentration is ~5N% (V / V). A portion of the cold nitrogen gas from the top of the air separation column is connected to the inlets of the 33rd, 35th, and 36th shut-off valves via a buffer tank. The outlet of the 33rd shut-off valve is also connected to an isolation valve. α Gas inlet, inlet of valve 43, inlet of valve 45, outlet of valve 43 connected to the isolation section. β Gas inlet, 45th shut-off valve outlet connection isolation c Gas inlet, isolation α The gas outlet is connected to the inlet of the forty-second shut-off valve, and the outlet of the forty-second shut-off valve discharges to the atmosphere; isolation. β The gas outlet is connected to the inlet of the 44th shut-off valve, and the outlet of the 44th shut-off valve discharges to the atmosphere; isolation. c The gas outlet is connected to the inlet of the forty-sixth shut-off valve, and the outlet of the forty-sixth shut-off valve discharges atmospheric air. A thermometer is installed at the outlet of the buffer tank.

[0008] Preferably: the outlet of the 35th shut-off valve is connected to the cold end inlet of the heat exchanger, and the nitrogen from the cold end outlet of the heat exchanger is returned to the upper air separation column; the outlet of the 36th shut-off valve is connected to the cold end inlet of the reheater, and the cold end outlet of the reheater is connected to the inlet of the electric heater; the inlets of the 55th and 56th shut-off valves are jointly connected to the compressed gas (test gas) source; the outlets of the 50th, 51st, and 52nd shut-off valves are jointly connected to the inlet of the 64th shut-off valve; the outlet of the 64th shut-off valve is simultaneously connected to the inlets of the 30th, 31st, 53rd, 54th, and 58th shut-off valves; the outlet of the 58th shut-off valve is connected to the vacuum pump port, and the vacuum pump exhaust port is connected to the atmosphere; the outlets of the 30th and 31st shut-off valves are simultaneously connected to the hot end inlet of the reheater, and the hot end outlet of the reheater safely exhausts to the atmosphere.

[0009] An oxygen production method using a non-low-temperature method to produce oxygen of different volumes and purities, the method comprising the following steps: 1) Argon-rich submodule α Using pressurized air following air separation molecular sieves as raw material, oxygen and nitrogen are adsorbed to obtain argon-rich air with a volume purity of ~10%. 2) Medium- and low-purity oxygen enrichment submodule β Using pressurized air following air separation molecular sieve as raw material, oxygen-enriched air with a volume purity of ~93% is produced. 3) High-purity oxygen enrichment submodule c The feed gas comes from the medium-low purity oxygen enrichment submodule. β After catalytic nitrogen removal, the adsorption tower outlet enters the high-purity oxygen enrichment module. c Adsorption to remove NH + 4. H2O, and other trace amounts of CO, CO2 and hydrocarbons, yield oxygen with a volume purity of 4n to 5n.

[0010] Preferably, the specific method in step 1) is as follows: slowly open the first, third, and fourth shut-off valves, and the compressed air after the air separation molecular sieve enters the adsorption tower through the hot end (60→61) of the heat exchanger. α -1. Adsorption Tower α -2, Note: This refers to the adsorption tower. α -1. Adsorption Tower α -2 A dual-bed setup is configured, filled with carbon molecular sieves and zeolite adsorbents respectively. The carbon molecular sieves are used to adsorb oxygen, H2O, CO, CO2, and C. n H m Zeolite adsorbent is used to adsorb nitrogen gas. The seventh and eighth shut-off valves (8) are opened, and the nitrogen gas passes through the adsorption tower. α -1. Adsorption Tower α -2 adsorption, argon-rich air is stored in argon-rich air buffer tank. The argon-rich air buffer tank is equipped with a pressure sensor. When the pressure in the argon-rich air buffer tank is not lower than the set value, the tenth shut-off valve is opened, and the argon-rich air is delivered to the application site.

[0011] Preferably, the specific method in step 2) is: adsorption tower. α -1. Adsorption Tower α -2 is the desorbed gas from nitrogen (PN) under air separation pressure. When the adsorption tower... α -1 and adsorption tower α When the adsorption at -2 is nearing saturation, the seventh and eighth shut-off valves are closed, while the fortieth, forty-first, and thirty-sixth shut-off valves are opened. Air separation pressure nitrogen (PN) is then used as the desorption gas to backflush the adsorption tower via a reheater and electric heater. α -1 and adsorption tower α -2; Open the 53rd, 54th, and 31st shut-off valves to backflush the desorption gas out of the adsorption tower. α -1 and adsorption towerα After -2, the nitrogen is reheated by exchanging heat with the nitrogen under air separation pressure through a reheater. It should be noted that the reheater is used to reheat the nitrogen under air separation pressure at the beginning of the desorption process. This increases the opening of the first shut-off valve, increasing the feed gas flow. Simultaneously, the eleventh, thirteenth, sixteenth, twenty-second, and twenty-third shut-off valves are opened, allowing the compressed air to enter the adsorption tower. β -3, Adsorption Tower β -3 is filled with zeolite molecular sieves to adsorb nitrogen from the air in the adsorption tower. β -3 Low-purity oxygen (~93% (V / V)) at the outlet passes through the 23rd shut-off valve to the application.

[0012] Preferably, the specific method in step 3) is as follows: slowly open the twenty-fourth shut-off valve, and the low-to-medium purity oxygen enrichment submodule... β The outlet oxygen (~93% (V / V)) partially goes to the catalytic denitrification unit. d Catalytic denitrification unit d The container is filled with the physical catalysts Pd and CuO. By adding a trace amount of H2, a small amount of oxygen and nitrogen react chemically at a temperature of 270℃~320℃ to produce NH4. + H2O, in the catalytic denitrification unit d Exporting products containing trace amounts of NH4 + Oxygen gas, H2O, and nitrogen, catalytic denitrification device d Exports contain trace amounts of NH4 + The oxygen, containing H2O, Ar, and nitrogen, is heated to 300℃. Heat is removed via a heat exchanger. The 26th and 29th shut-off valves are opened, allowing oxygen (containing trace amounts of NH4) to exit the heat exchanger at the hot end. + H2O and Ar) first pass through the adsorption tower c -1 adsorbs NH4 + And H2O, and then pass through an adsorption tower c -2 adsorbs Ar and a small amount of O2, and finally in the adsorption tower c -2 Oxygen with a volume purity of ~5N is obtained at the outlet.

[0013] The beneficial effects of this invention are as follows: This invention relates to an apparatus and method for producing oxygen of different volumes of purity using a non-cryogenic method. It combines traditional cryogenic air separation distillation equipment with a non-cryogenic pressure swing adsorption (PSA) device to achieve the combined production of oxygen of different volumes of purity. The apparatus of this invention uses compressed air after the air separation molecular sieve as the feed gas for the non-cryogenic oxygen production, while nitrogen at the top of the lower air separation column is used as the refrigerant to maintain the cryogenic environment of the non-cryogenic PSA column. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the invention. Detailed Implementation

[0015] The invention will now be described in detail with reference to the accompanying drawings: Figure 1 As shown, a device for producing oxygen of different volumes of purity using a non-cryotherapy method includes an argon-rich submodule. α、 Medium and low purity oxygen enrichment submodule β、 High-purity oxygen enrichment submodule c Composed of three parts ， The argon-rich submodule is characterized by α、 Medium and low purity oxygen enrichment submodule β、 High-purity oxygen enrichment submodule c The interconnected argon-rich submodule α Using pressurized air following air separation molecular sieves as raw material, oxygen and nitrogen are adsorbed to obtain argon-rich air with a volume purity of ~10%; a medium-low purity oxygen enrichment submodule. β Using pressurized air following air separation molecular sieves as raw material, oxygen-enriched air with a volume purity of ~93% is produced; high-purity oxygen enrichment module. c The feed gas comes from the medium-low purity oxygen enrichment submodule. β After catalytic nitrogen removal, the adsorption tower outlet enters the high-purity oxygen enrichment module. c Adsorption to remove NH + 4. H2O, and other trace amounts of CO, CO2 and hydrocarbons, yield oxygen with a volume purity of 4n to 5n.

[0016] The feed gas comes from the air after the air separation molecular sieve. Part of the air after the air separation molecular sieve enters the air separation unit, and part is connected to the inlet of the first shut-off valve 1. The outlet of the first shut-off valve 1 is connected to the hot end inlet 60 of the heat exchanger 2. The hot end outlet 61 of the heat exchanger 2 is simultaneously connected to the inlet of the third shut-off valve 1 and the inlet of the fourth shut-off valve 4. The outlet of the third shut-off valve 1 is simultaneously connected to the inlet of the eleventh shut-off valve 11 and the inlet of the fifty-third shut-off valve 53, as well as the adsorption tower. α -15 inlet; the fourth shut-off valve 4 outlet is simultaneously connected to the twelfth shut-off valve 12 inlet, the fifty-fourth shut-off valve 54 inlet, and the adsorption tower. α -26 inlet, the adsorption tower α -15 outlet is simultaneously connected to the inlet of the seventh shut-off valve 7 and the outlet of the fortieth shut-off valve 40; Adsorption tower α -26 outlet is simultaneously connected to the inlet of the eighth shut-off valve 8 and the outlet of the forty-first shut-off valve 41. The outlet of the seventh shut-off valve 7 and the outlet of the eighth shut-off valve 8 are both connected to the inlet of the argon-rich air buffer tank 9. The outlet of the argon-rich air buffer tank 9 is connected to the inlet of the tenth shut-off valve 10, and the outlet of the tenth shut-off valve 10 is connected to other systems. The adsorption tower... α -15 Outlet and Adsorption Tower αThe outlets at -26 are connected and equipped with a pressure equalization device to ensure a smooth transition when switching between adsorption towers.

[0017] The outlets of the eleventh shut-off valve 11 and the twelfth shut-off valve 12 are both connected to the inlet of the thirteenth shut-off valve 13; the outlet of the thirteenth shut-off valve 13 is also connected to the inlet of the fourteenth shut-off valve 14, the inlet of the fifteenth shut-off valve 15, and the inlet of the sixteenth shut-off valve 16. The outlet of the fourteenth shut-off valve 14 is connected to the adsorption tower. β -117 inlet, 50th shut-off valve inlet; 15th shut-off valve outlet connected to adsorption tower. β -218 inlet, 51st shut-off valve inlet; 16th shut-off valve outlet connected to the adsorption tower. β -319 inlet, 52nd shut-off valve inlet.

[0018] The adsorption tower β -117 outlet connects to the 20th shut-off valve 20 inlet and the 47th shut-off valve 47 outlet; adsorption tower β -218 outlet connection to the 21st shut-off valve 21 inlet and the 48th shut-off valve 48 outlet; adsorption tower β -319 outlet connects to the inlet of the 22nd shut-off valve 22 and the outlet of the 49th shut-off valve 49. The inlets of the 47th shut-off valve 47, the 48th shut-off valve 48, and the 49th shut-off valve 49 are connected to the inlet of the 40th shut-off valve 40, the inlet of the 41st shut-off valve 41, the outlet of the electric heater 38, the outlet of the 55th shut-off valve 55, and the outlet of the 56th shut-off valve 56. It should be noted that the outlet of the electric heater 38 is equipped with a thermometer 39 and a pressure sensor 65.

[0019] The outlets of the 20th, 21st, and 22nd shut-off valves are all connected to the inlet of the 23rd and 24th shut-off valves. The outlet of the 23rd shut-off valve is connected to a pure oxygen application environment with an oxygen concentration of approximately 93% V / V. The outlet of the 24th shut-off valve is connected to the feed gas inlet of the catalytic purification device 25. The feed gas outlet of the catalytic purification device 25 is connected to the hot end inlet 62 of the heat exchanger 2. The hot end outlet 63 of the heat exchanger 2 is connected to the inlet of the 26th shut-off valve 26. The outlet of the 26th shut-off valve 26 is connected to the adsorption tower. c -127 imported adsorption tower c -127 Outlet Connection Adsorption Tower c -228 imported adsorption tower c-228 outlet connects to the inlet of the 29th shut-off valve 29. The outlet of the 29th shut-off valve 29 is connected to the high-purity oxygen application, where the oxygen concentration is ~5N%V / V. A portion of the cold nitrogen gas from the top of the air separation column is connected to the inlets of the 33rd shut-off valve 33, the 35th shut-off valve 35, and the 36th shut-off valve 36 via buffer tank 32. The outlet of the 33rd shut-off valve 33 is also connected to an isolation valve. α Gas inlet, inlet of valve 43 (43rd shut-off valve), inlet of valve 45 (45th shut-off valve). Outlet connection of valve 43 (43rd shut-off valve) is isolated. β Gas inlet, 45th shut-off valve, 45th outlet connection isolation c Gas inlet. Isolation. α The gas outlet is connected to the inlet of the 42nd shut-off valve, and the outlet of the 42nd shut-off valve discharges to the atmosphere; isolation. β The gas outlet is connected to the inlet of the 44th shut-off valve, and the outlet of the 44th shut-off valve discharges to the atmosphere; isolation. c The gas outlet is connected to the inlet of the forty-sixth shut-off valve 46, and the outlet of the forty-sixth shut-off valve 46 discharges atmospheric air. A thermometer 34 is installed at the outlet of the buffer tank 32.

[0020] The outlet of the thirty-fifth shut-off valve 35 is connected to the cold end inlet of heat exchanger 2, and the nitrogen from the cold end outlet of heat exchanger 2 returns to the upper air separation column. The outlet of the thirty-sixth shut-off valve 36 is connected to the cold end inlet of reheater 37, and the cold end outlet of reheater 37 is connected to the inlet of electric heater 38. The inlets of the fifty-fifth shut-off valve 55 and the fifty-sixth shut-off valve 56 are both connected to the compressed gas test gas source. The outlets of the fiftieth shut-off valve 50, the fifty-first shut-off valve 51, and the shut-off valve G352 are all connected to the inlet of shut-off valve U64, and the outlet of shut-off valve U64 is simultaneously connected to the inlets of the thirtieth shut-off valve 30, the thirty-first shut-off valve 31, the fifty-third shut-off valve 53, and the fifty-fourth shut-off valve 54. The inlet of the fifty-eighth shut-off valve 58 is connected to the outlet of the fifty-eighth shut-off valve 58, which is connected to the suction port of the vacuum pump 59. The exhaust port of the vacuum pump 59 is connected to the atmosphere. The outlets of the thirtieth shut-off valve 30 and the thirty-first shut-off valve 31 are simultaneously connected to the hot end inlet of the reheater 37, and the hot end outlet of the reheater 37 safely exhausts to the atmosphere.

[0021] The device of this invention uses air after air separation molecular sieve as raw material gas, and can separate argon-rich gas, low-purity oxygen and high-purity oxygen. Before the system is started, the air in the pipeline needs to be purged with high-purity nitrogen 3 to 5 times: each time the system pipeline is purged for 5 to 6 hours, and then the system is evacuated to below 3 kPa until the system's atmospheric pressure dew point is below -79℃ and H2O ≤ 1 ppm.

[0022] All valves are closed before the system is started; First, slowly open the first shut-off valve 1, the third shut-off valve 1, and the fourth shut-off valve 4. The compressed air after the air separation molecular sieve enters the adsorption tower through the hot end 60→61 of the heat exchanger. α -15. Adsorption Tower α -26. Note: This refers to the adsorption tower. α -15. Adsorption Tower α -2 A dual-bed setup is configured, filled with carbon molecular sieves and zeolite adsorbents respectively. The carbon molecular sieves are used to adsorb oxygen, H2O, CO, CO2, and C. n H m Zeolite adsorbent is used to adsorb nitrogen gas. Opening the seventh shut-off valve (7) and the eighth shut-off valve (8) allows the nitrogen to pass through the adsorption tower. α -15. Adsorption Tower α -26 adsorption, argon-rich air is stored in argon-rich air buffer tank 9. Argon-rich air buffer tank 9 is equipped with pressure sensor 57. When the pressure of argon-rich air buffer tank 9 is not lower than the set value, the tenth shut-off valve 10 is opened, and argon-rich air is supplied to the application site.

[0023] Adsorption tower α -15. Adsorption Tower α -26% of the desorbed gas comes from nitrogen PN under air separation pressure. When the adsorption tower... α -15 and adsorption tower α -26 adsorption is close to saturation. Seventh and eighth shut-off valves 7 and 8 are closed, while fortieth, forty-first, and thirty-sixth shut-off valves 40, 41, and 36 are opened. Air separation pressure nitrogen PN is used as desorption gas to backflush the adsorption tower via reheater 37 and electric heater 38. α -15 and adsorption tower α -26; Open the 53rd shut-off valve 53, shut-off valve C-154, and the 31st shut-off valve 31 to backflush the desorption gas out of the adsorption tower. α -15 and adsorption tower α After -26, the nitrogen gas is reheated by exchanging heat with the nitrogen gas under air separation pressure through reheater 37. It should be noted here that reheater 37 is used to reheat the nitrogen gas PN under air separation pressure during the initial desorption process.

[0024] Adsorption tower α -15. Adsorption Tower α -26 is grouped together. In practical applications, based on the amount of air after the air separation molecular sieve, it can be used in the argon-rich submodule. α Multiple adsorption towers are set up, with two towers in each group, to achieve simultaneous desorption and adsorption.

[0025] Increasing the opening of the first shut-off valve 1 increases the amount of raw material gas. Simultaneously, the eleventh shut-off valve 11, the thirteenth shut-off valve 13, the sixteenth shut-off valve 16, the twenty-second shut-off valve 22, and the twenty-third shut-off valve 23 are opened, allowing the compressed air to enter the adsorption tower. β-319, Adsorption Tower β -319 is filled with zeolite molecular sieves to adsorb nitrogen from the air in the adsorption tower. β -319 outlet low purity oxygen ~93%V / V passes through the twenty-third shut-off valve 23 to the application.

[0026] Medium and low purity oxygen enrichment submodule β The system is equipped with multiple adsorption towers, including adsorption towers. β -117, Adsorption Tower β -218, Adsorption Tower β -319, but not limited to. A pressure equalization device is installed between the two adsorption towers. When one adsorption tower is closed and the other adsorption tower is opened, there is a pressure equalization process of 1 to 1.5 seconds between them. That is, the inlet and outlet valves of the adsorption tower that is saturated with adsorption will close before the inlet and outlet valves of the other adsorption tower to be used will open, with a time difference of 0.7 to 1 second.

[0027] When the adsorption tower β After the adsorption of -319 is saturated, close the sixteenth shut-off valve 16 and the twenty-second shut-off valve 22, and simultaneously open the adsorption tower. β -218 Inlet and outlet fifteenth shut-off valve 15, twenty-first shut-off valve 21, adsorption tower β -218 began normal operation. Meanwhile, the adsorption tower... β -319 enters the regeneration process.

[0028] Open the forty-ninth shut-off valve 49, the fifty-second shut-off valve 52, the thirtieth shut-off valve 30, and the shut-off valve U64 to activate the air separation reheat pressure nitrogen PN backflushing adsorption tower. β -319, Backflush Adsorption Tower β After -319, the air separation reheat pressure nitrogen PN passes through the 30th shut-off valve 30 and shut-off valve U64 and connects to the argon-rich submodule. α The adsorption tower's desorbed gas is collected and reheated by reheater 37 to produce nitrogen gas under air separation pressure. (Adsorption tower) β -319 Regeneration complete, then close the forty-ninth shut-off valve 49 and the fifty-second shut-off valve 52, adsorption tower β -319 awaits activation.

[0029] Slowly open the 24th shut-off valve 24, medium-low purity oxygen enrichment submodule. β The outlet oxygen is partially denitrified to a catalytic denitrification unit at a rate of 93% v / v. d Catalytic denitrification unit d The container is filled with the physical catalysts Pd and CuO. By adding a trace amount of H2, a small amount of oxygen and nitrogen react chemically at a temperature of 270℃~320℃ to produce NH4. + H2O, in the catalytic denitrification unit d Exporting products containing trace amounts of NH4+ The nitrogen gas contains oxygen, H2O, and nitrogen. It should be noted that a slight excess of H2 will react with oxygen to produce H2O, therefore the catalytic nitrogen removal device... d The volume concentration of H2 at the outlet can be controlled below 1 ppm.

[0030] Catalytic nitrogen removal unit d Exports contain trace amounts of NH4 + The oxygen, including H2O, Ar, and nitrogen, is at a temperature of 300℃, and heat is removed through heat exchanger 2. Specifically, this is a catalytic denitrification device. d Exports contain trace amounts of NH4 + H2O and Ar, as well as oxygen from nitrogen, pass through the hot end 62→63 of heat exchanger 2, and exchange heat with the hot end 60→61 of compressed air heat exchanger 2 after air separation molecular sieve and the cold end of air separation cold nitrogen heat exchanger 2. The temperature at the hot end outlet 63 of heat exchanger 2 is 25℃.

[0031] With the 26th and 29th shut-off valves opened, the oxygen at the hot end outlet 63 of heat exchanger 2 contains trace amounts of NH4. + H2O and Ar first pass through the adsorption tower c -127 adsorbs NH4 + And H2O, and then pass through an adsorption tower c -228 adsorbs Ar and a small amount of O2, and finally in the adsorption tower c -228 Oxygen with a volume purity of ~5N was obtained at the outlet.

[0032] Adsorption tower c -127 and Adsorption Tower c A 46th shut-off valve 46 is installed at the lowest point of the pipeline between -228 and 46, which serves as a drain outlet and slag outlet.

[0033] In addition, the present invention includes three functional sub-modules: 1. Argon-rich sub-module α 2. Medium- and low-purity oxygen enrichment submodule β 3. High-purity oxygen enrichment submodule c All of them are located within a vacuum chamber, and are placed in three compartments within the vacuum chamber. α , β , c The three compartments are independent and not interconnected; each compartment is independently supplied with nitrogen gas at air separation pressure. This ensures the functionality of the three sub-modules: 1. Argon-rich sub-module. α 2. Medium- and low-purity oxygen enrichment submodule β 3. High-purity oxygen enrichment submodule c All operate at low temperatures, ranging from 5°C, to enhance the adsorption capacity of the adsorbent. Further details: Open the 33rd shut-off valve 33 and the 42nd shut-off valve 42, and the air separation pressure nitrogen gas passes through the isolation valve. αUsed to maintain the adsorption tower α -15. Adsorption Tower α Operating environment: -26°C. Open shut-off valves 43 (43) and 44 (44) to allow nitrogen gas under air separation pressure to pass through the isolation valve. β Used to maintain the adsorption tower β -117, Adsorption Tower β -218, Adsorption Tower β Operating environment: -319°C. Open shut-off valves 45 (45) and 46 (46) to allow nitrogen gas under air separation pressure to pass through the isolation valve. c Used to maintain the adsorption tower c -127, Adsorption Tower c Operating environment at -228°C.

[0034] The outlet pressure nitrogen PN of the forty-second shut-off valve 42, the forty-fourth shut-off valve 44, and the forty-sixth shut-off valve 46 is safely vented. Compressed air test gas can replace the reheating of the air separation pressure nitrogen PN in certain special scenarios, such as air separation unit shutdown for maintenance or insufficient pressure nitrogen production. The electric heater 38 is used for reheating the air separation pressure nitrogen during device startup; during device operation, if the temperature of the air separation pressure nitrogen PN after reheating by the reheater 37 is too low (≤20℃), it can continue to be reheated until the adsorbent desorption temperature.

[0035] This invention relates to a technology and apparatus for producing oxygen of varying purities in different volumes using a non-cryotherapy method. It combines traditional cryogenic air separation distillation equipment with a non-cryotherapy pressure swing adsorption (PSA) system to achieve the combined production of oxygen of different purities. The apparatus uses compressed air from the air separation molecular sieve as the feed gas for the non-cryotherapy oxygen production, while nitrogen gas at the top of the lower air separation column is used as the refrigerant to maintain the cryogenic environment of the PSA column. The apparatus has three functional sub-modules: 1. Argon-rich sub-module. α 2. Medium- and low-purity oxygen enrichment submodule β 3. High-purity oxygen enrichment submodule c Specifically: 1. Argon-rich submodule α Using pressurized air following air separation molecular sieves as raw material, oxygen and nitrogen are adsorbed to obtain argon-rich air with a volume purity of ~10%; 2. Medium-low purity oxygen enrichment submodule β Using pressurized air following air separation molecular sieves as raw material, oxygen-enriched air with a volume purity of ~93% is produced; 3. High-purity oxygen enrichment submodule c The feed gas comes from the medium-low purity oxygen enrichment submodule. β After catalytic nitrogen removal at 270℃~320℃, the adsorption tower outlet enters the high-purity oxygen enrichment module. c Adsorption to remove NH +4. H2O, and other trace amounts of CO, CO2 and hydrocarbons, yield oxygen with a volume purity of 4n to 5n.

Claims

1. A device for producing oxygen of different volumes of purity using a non-cryotherapy method, comprising an argon-rich submodule. α、 Medium and low purity oxygen enrichment submodule β、 High-purity oxygen enrichment submodule γ Composed of three parts ， Its features The argon-rich submodule α、 Medium and low purity oxygen enrichment submodule β、 High-purity oxygen enrichment submodule γ The interconnected argon-rich submodule α Using pressurized air following air separation molecular sieves as raw material, oxygen and nitrogen are adsorbed to obtain argon-rich air with a volume purity of ~10%; a medium-low purity oxygen enrichment submodule. β Using pressurized air following air separation molecular sieves as raw material, oxygen-enriched air with a volume purity of ~93% is produced; high-purity oxygen enrichment module. γ The feed gas comes from the medium-low purity oxygen enrichment submodule. β After catalytic nitrogen removal, the adsorption tower outlet enters the high-purity oxygen enrichment module. γ Adsorption to remove NH + 4. H2O, and other trace amounts of CO, CO2 and hydrocarbons, yield oxygen with a volume purity of 4n to 5n.

2. The apparatus for producing oxygen of different volumes of purity using a non-cryogenic method according to claim 1, characterized in that... The raw material gas comes from the air after the air separation molecular sieve. Part of the air after the air separation molecular sieve enters the air separation unit, and part of it is connected to the inlet of the first shut-off valve (1). The outlet of the first shut-off valve (1) is connected to the hot end inlet (60) of the heat exchanger (2). The hot end outlet (61) of the heat exchanger (2) is simultaneously connected to the inlet of the third shut-off valve (3) and the inlet of the fourth shut-off valve (4). The outlet of the third shut-off valve (3) is simultaneously connected to the inlet of the eleventh shut-off valve (11), the inlet of the fifty-third shut-off valve (53), and the adsorption tower. α -1 (5) Inlet; Fourth shut-off valve (4) outlet is simultaneously connected to the inlet of the twelfth shut-off valve (12), the inlet of the fifty-fourth shut-off valve (54), and the adsorption tower. α -2 (6) Inlet, the adsorption tower α -1 (5) outlet is simultaneously connected to the inlet of the seventh shut-off valve (7) and the outlet of the fortieth shut-off valve (40); adsorption tower α -2 (6) outlet is simultaneously connected to the inlet of the eighth shut-off valve (8) and the outlet of the forty-first shut-off valve (41). The outlet of the seventh shut-off valve (7) and the outlet of the eighth shut-off valve (8) are jointly connected to the inlet of the argon-rich air buffer tank (9). The outlet of the argon-rich air buffer tank (9) is connected to the inlet of the tenth shut-off valve (10). The outlet of the tenth shut-off valve (10) is connected to other systems. The adsorption tower α -1(5) Outlet and Adsorption Tower α -2 (6) The outlets are connected and equipped with a pressure equalization device to achieve a smooth transition when switching between adsorption towers.

3. The apparatus for producing oxygen of different volumes of purity using a non-cryogenic method according to claim 2, characterized in that... The outlets of the eleventh shut-off valve (11) and the twelfth shut-off valve (12) are both connected to the inlet of the thirteenth shut-off valve (13); the outlet of the thirteenth shut-off valve (13) is simultaneously connected to the inlet of the fourteenth shut-off valve (14), the inlet of the fifteenth shut-off valve (15), and the inlet of the sixteenth shut-off valve (16), wherein the outlet of the fourteenth shut-off valve (14) is connected to the adsorption tower. β -1 (17) Inlet, Fiftieth shut-off valve (50) Inlet; Fifteenth shut-off valve (15) Outlet connection to adsorption tower β -2 (18) Inlet, Fifty-first stop valve (51) Inlet; Sixteenth stop valve (16) Outlet connection to adsorption tower β -3 (19) Inlet, Fifty-second stop valve (52) Inlet.

4. The apparatus for producing oxygen of different volumes of purity using a non-cryotherapy method according to claim 3, characterized in that... The adsorption tower β -1 (17) outlet connection to the 20th shut-off valve (20) inlet, the 47th shut-off valve (47) outlet; adsorption tower β -2 (18) outlet connection to the inlet of the 21st shut-off valve (21) and the outlet of the 48th shut-off valve (48); adsorption tower β -3 (19) outlet connects to the inlet of the 22nd stop valve (22), the outlet of the 49th stop valve (49), the inlet of the 47th stop valve (47), the inlet of the 48th stop valve (48), and the inlet of the 49th stop valve (49) together connect to the inlet of the 40th stop valve (40), the inlet of the 41st stop valve (41), the outlet of the electric heater (38), the outlet of the 55th stop valve (55), and the outlet of the 56th stop valve (56). The outlet of the electric heater (38) is equipped with a thermometer (39) and a pressure sensor (65).

5. The apparatus for producing oxygen of different volumes of purity using a non-cryotherapy method according to claim 4, characterized in that... The outlets of the 20th shut-off valve (20), 21st shut-off valve (21), and 22nd shut-off valve (22) are connected to the inlet of the 23rd shut-off valve (23) and the inlet of the 24th shut-off valve (24). The outlet of the 23rd shut-off valve (23) is connected to the pure oxygen application environment, where the oxygen concentration is ~93% (V / V). The outlet of the 24th shut-off valve (24) is connected to the feed gas inlet of the catalytic purification device (25). The feed gas outlet of the catalytic purification device (25) is connected to the hot end inlet (62) of the heat exchanger (2). The hot end outlet (63) of the heat exchanger (2) is connected to the inlet of the 26th shut-off valve (26). The outlet of the 26th shut-off valve (26) is connected to the adsorption tower. γ -1 (27) Inlet, Adsorption Tower γ -1 (27) Outlet connection adsorption tower γ -2 (28) Inlet, Adsorption Tower γ -2 (28) outlet is connected to the inlet of the 29th shut-off valve (29), the outlet of the 29th shut-off valve (29) is connected to the high-purity oxygen application, where the oxygen concentration is ~5N% (V / V), and a portion of the cold nitrogen gas from the top of the air separation tower is connected to the inlet of the 33rd shut-off valve (33), the inlet of the 35th shut-off valve (35), and the inlet of the 36th shut-off valve (36) respectively through the buffer tank (32); the outlet of the 33rd shut-off valve (33) is also connected to the isolation valve. α Gas inlet, inlet of the 43rd shut-off valve (43), inlet of the 45th shut-off valve (45), outlet of the 43rd shut-off valve (43) connected to the isolation. β Gas inlet, 45th shut-off valve (45) outlet connection isolation γ Gas inlet, isolation α The gas outlet is connected to the inlet of the forty-second shut-off valve (42), and the outlet of the forty-second shut-off valve (42) discharges into the atmosphere; isolation β The gas outlet is connected to the inlet of the forty-fourth shut-off valve (44), and the outlet of the forty-fourth shut-off valve (44) discharges into the atmosphere; isolation γ The gas outlet is connected to the inlet of the forty-sixth shut-off valve (46), and the outlet of the forty-sixth shut-off valve (46) discharges the atmosphere. A thermometer (34) is installed at the outlet of the buffer tank (32).

6. The apparatus for producing oxygen of different volumes of purity using a non-cryotherapy method according to claim 5, characterized in that... The outlet of the thirty-fifth shut-off valve (35) is connected to the cold end inlet of the heat exchanger (2), and the nitrogen from the cold end outlet of the heat exchanger (2) returns to the upper air separation column. The outlet of the thirty-sixth shut-off valve (36) is connected to the cold end inlet of the reheater (37), and the cold end outlet of the reheater (37) is connected to the inlet of the electric heater (38). The inlets of the fifty-fifth shut-off valve (55) and the fifty-sixth shut-off valve (56) are connected to the compressed gas source. The outlets of the fiftieth shut-off valve (50), the fifty-first shut-off valve (51), and the fifty-second shut-off valve (52) are connected to the sixty-fourth shut-off valve (64). The inlet of the 64th shut-off valve (64) is connected to the inlet of the 30th shut-off valve (30), the inlet of the 31st shut-off valve (31), the outlet of the 53rd shut-off valve (53), the outlet of the 54th shut-off valve (54), and the inlet of the 58th shut-off valve (58). The outlet of the 58th shut-off valve (58) is connected to the suction port of the vacuum pump (59), and the exhaust port of the vacuum pump (59) is connected to the atmosphere. The outlets of the 30th shut-off valve (30) and the 31st shut-off valve (31) are connected to the hot end inlet of the reheater (37), and the hot end outlet of the reheater (37) is safely discharged to the atmosphere.

7. An oxygen production method using a non-low-temperature method to produce oxygen of different volumes and purities, as described in any one of claims 1-6, characterized in that... The method includes the following steps: 1) Argon-rich submodule α Using pressurized air following air separation molecular sieves as raw material, oxygen and nitrogen are adsorbed to obtain argon-rich air with a volume purity of ~10%. 2) Medium- and low-purity oxygen enrichment submodule β Using pressurized air following air separation molecular sieve as raw material, oxygen-enriched air with a volume purity of ~93% is produced. 3) High-purity oxygen enrichment submodule γ The feed gas comes from the medium-low purity oxygen enrichment submodule. β After catalytic nitrogen removal, the adsorption tower outlet enters the high-purity oxygen enrichment module. γ Adsorption to remove NH + 4. H2O, and other trace amounts of CO, CO2 and hydrocarbons, yield oxygen with a volume purity of 4n to 5n.

8. The oxygen production method according to claim 7, which uses a non-low-temperature method to produce oxygen of different volumes and purities, is characterized in that... The specific method in step 1) is as follows: slowly open the first shut-off valve (1), the third shut-off valve (3), and the fourth shut-off valve (4), and the compressed air after the air separation molecular sieve enters the adsorption tower through the hot end of the heat exchanger. α -1(5), Adsorption Tower α -2(6), here adsorption tower α -1(5), Adsorption Tower α -2 A dual-bed setup is configured, filled with carbon molecular sieves and zeolite adsorbents respectively. The carbon molecular sieves are used to adsorb oxygen, H2O, CO, CO2, and C. n H m Zeolite adsorbent is used to adsorb nitrogen gas. The seventh and eighth shut-off valves (7 and 8) are opened, and the nitrogen gas passes through the adsorption tower. α -1(5), Adsorption Tower α -2 (6) adsorption, argon-rich air is stored in argon-rich air buffer tank (9), argon-rich air buffer tank (9) is equipped with pressure sensor (57), when the pressure of argon-rich air buffer tank (9) is not lower than the set value, the tenth shut-off valve (10) is opened, and argon-rich air is delivered to the application site.

9. The oxygen production method according to claim 7, which uses a non-low-temperature method to produce oxygen of different volumes and purities, is characterized in that... The specific method in step 2) is as follows: adsorption tower α -1(5), Adsorption Tower α -2(6) of the desorbed gas comes from nitrogen (PN) under air separation pressure, when the adsorption tower α -1(5) and adsorption tower α -2 (6) When adsorption is close to saturation, close the seventh stop valve (7) and the eighth stop valve (8), and simultaneously open the fortieth stop valve (40), the forty-first stop valve (41) and the thirty-sixth stop valve (36). Air separation pressure nitrogen (PN) is used as desorption gas to backflush the adsorption tower through the reheater (37) and the electric heater (38). α -1(5) and adsorption tower α -2 (6); Open the 53rd shut-off valve (53), the 54th shut-off valve (54), and the 31st shut-off valve (31) to backflush the desorption gas out of the adsorption tower. α -1(5) and adsorption tower α After -2 (6), the nitrogen is reheated by exchanging heat with the air separation pressure nitrogen through the reheater (37). The reheater (37) is used to reheat the air separation pressure nitrogen (PN) in the initial process of desorption. The opening of the first shut-off valve (1) is increased, the raw material gas volume is increased, and the eleventh shut-off valve (11), the thirteenth shut-off valve (13), the sixteenth shut-off valve (16), the twenty-second shut-off valve (22), and the twenty-third shut-off valve (23) are opened at the same time, and the raw material compressed air enters the adsorption tower. β -3 (19), Adsorption Tower β -3 (19) is filled with zeolite molecular sieves to adsorb nitrogen from the raw material air. β -3 (19) Low-purity oxygen (~93% (V / V)) is discharged through the twenty-third shut-off valve (23) to the application site.

10. The oxygen production method according to claim 7, which uses a non-low-temperature method to produce oxygen of different volumes and purities, is characterized in that... The specific method in step 3) is as follows: slowly open the twenty-fourth shut-off valve (24), and the low-purity oxygen enrichment submodule... β The outlet oxygen (~93% (V / V)) partially goes to the catalytic denitrification unit. δ Catalytic denitrification unit δ The container is filled with the physical catalysts Pd and CuO. By adding a trace amount of H2, a small amount of oxygen and nitrogen react chemically at a temperature of 270℃~320℃ to produce NH4. + H2O, in the catalytic denitrification unit δ Exporting products containing trace amounts of NH4 + Oxygen gas, H2O, and nitrogen, catalytic denitrification device δ Exports contain trace amounts of NH4 + H2O and Ar, as well as nitrogen and oxygen at a temperature of 300℃, are removed by heat exchanger (2). The 26th shut-off valve (26) and the 29th shut-off valve (29) are opened, and oxygen (containing trace amounts of NH4) is released at the hot end outlet (63) of heat exchanger (2). + H2O and Ar) first pass through the adsorption tower γ -1(27) adsorbs NH4 + And H2O, and then pass through an adsorption tower γ -2 (28) adsorbs Ar and a small amount of O2, and finally in the adsorption tower γ -2(28) Oxygen with a volume purity of ~5N is obtained from the outlet.

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