A kind of air separation oxygen system

Abstract

The utility model relates to the technical field of gas separation, specifically refers to a kind of air separation oxygen production system.The air separation oxygen production system includes: compressed air preparation module, oxygen enrichment machine, PSA nitrogen generator and pressure stabilizing oxygen production module, compressed air preparation module is connected oxygen enrichment machine and PSA nitrogen generator respectively by compressed air pipeline;The first gas outlet of oxygen enrichment machine is connected with PSA nitrogen generator by first nitrogen-rich pipeline, and the second gas outlet of oxygen enrichment machine is connected with pressure stabilizing oxygen production module by first oxygen-rich pipeline;The first gas outlet of PSA nitrogen generator is connected with pressure stabilizing oxygen production module by second oxygen-rich pipeline, and the second gas outlet of PSA nitrogen generator is connected with oxygen enrichment machine by second nitrogen-rich pipeline.Advantages: by the integration of PSA nitrogen production and membrane separation oxygen production process, the oxygen-enriched gas prepared in oxygen enrichment machine is fully mixed with venturi mixer, and is transported to oxygen-enriched storage tank to complete final pressure stabilization, realizes one-stop collaborative supply of high-quality oxygen-enriched and nitrogen-enriched gas, and significantly improves overall economic benefit.

Description

Technical Field

[0001] This utility model relates to the field of gas separation technology, specifically to an air separation oxygen production system. Background Technology

[0002] Pressure Swing Adsorption (PSA) nitrogen production utilizes the difference in diffusion rates of oxygen and nitrogen molecules in the air through carbon molecular sieves, achieving gas separation through periodic pressure changes. Under pressure, oxygen molecules, due to their smaller diameter, diffuse rapidly into the micropores of the carbon molecular sieve and are adsorbed, while nitrogen molecules, due to their larger diameter, diffuse more slowly and are enriched in the gas phase, thus obtaining high-purity nitrogen. When the carbon molecular sieve approaches adsorption saturation, desorption is applied to release the adsorbed oxygen molecules, regenerating the carbon molecular sieve and restoring its adsorption capacity. However, the pulsed oxygen-enriched tail gas generated during PSA nitrogen production suffers from low concentrations and difficulty in recovery, often resulting in direct emission into the atmosphere.

[0003] Membrane separation oxygen production utilizes polymer membrane materials with selective permeability. Driven by a pressure difference, oxygen in the air, due to its smaller molecular size and faster diffusion rate, preferentially permeates through the membrane, while larger molecules such as nitrogen are retained. This results in oxygen-rich gas and nitrogen-rich gas forming on opposite sides of the membrane. Oxygen separation and purification are achieved by collecting the oxygen-rich gas that permeates through the membrane. This process requires no phase change, has low energy consumption, and is simple to operate. However, the low concentration of nitrogen generated during membrane separation oxygen production also faces the problem of low utilization. Therefore, how to effectively integrate these two processes to achieve resource utilization of the byproduct gas and thus improve overall economic efficiency is a key issue that urgently needs to be addressed. Utility Model Content

[0004] In view of the problems of high difficulty in nitrogen recovery from PSA and low utilization rate of oxygen production from membrane separation in the existing technology, this utility model discloses an air separation oxygen production system.

[0005] An air separation oxygen production system, comprising:

[0006] The system includes a compressed air preparation module, an oxygen enrichment unit, a PSA nitrogen generator, and a stable oxygen generation module. The compressed air preparation module is connected to the oxygen enrichment unit and the PSA nitrogen generator via compressed air pipelines.

[0007] The first outlet of the oxygen enrichment unit is connected to the PSA nitrogen generator via the first nitrogen enrichment pipeline, and the second outlet of the oxygen enrichment unit is connected to the stable oxygen generation module via the first oxygen enrichment pipeline; the first outlet of the PSA nitrogen generator is connected to the stable oxygen generation module via the second oxygen enrichment pipeline, and the second outlet of the PSA nitrogen generator is connected to the oxygen enrichment unit via the second nitrogen enrichment pipeline.

[0008] Optionally, the air separation oxygen generation system further includes a nitrogen collection module, which includes an overflow pipe, a first check valve, a three-way mixer, a nitrogen-enriched buffer tank, and a first regulating valve connected in sequence. The nitrogen collection module is connected to the oxygen enrichment machine and the PSA nitrogen generator through a first nitrogen-enriched pipeline and a second nitrogen-enriched pipeline, respectively. The outlet end of the first nitrogen-enriched pipeline is connected to the three-way mixer.

[0009] Optionally, a second regulating valve is installed on the overflow pipe.

[0010] Optionally, the compressed air preparation module includes an air filter, an air compressor, a dryer, and a cooler connected in sequence via compressed air pipelines.

[0011] Optionally, the oxygen stabilization module includes a pressure collection box, an exhaust fan, a second check valve, a venturi mixer, an oxygen-enriched buffer tank, and a third regulating valve, all connected in sequence, with the outlet end of the first oxygen-enriched pipeline connected to the venturi mixer.

[0012] Optionally, a third check valve and a fourth check valve are respectively provided on the first nitrogen-enriched pipeline and the first oxygen-enriched pipeline.

[0013] Optionally, the compressed air preparation module is provided with a fourth regulating valve and a fifth regulating valve on the compressed air pipelines connecting it to the oxygen enrichment machine and the PSA nitrogen generator, respectively.

[0014] Optionally, each of the check valves and regulating valves is an electric valve or a pneumatic valve.

[0015] This utility model, by adopting the above technical solution, has significant technical effects:

[0016] 1. This utility model integrates PSA nitrogen production and membrane separation oxygen production processes to achieve a one-stop coordinated supply of oxygen-rich and nitrogen-rich gases. During operation, zero venting of the gas source is achieved through process coupling, and the concentration and flow rate of oxygen and nitrogen can be flexibly adjusted to meet the gas demand of industrial scenarios such as cement kilns, thereby significantly improving overall economic efficiency;

[0017] 2. In this invention, the pulsed oxygen-enriched gas generated by the PSA nitrogen generator is first introduced into the pressure equalization collection box for preliminary pressure stabilization. Then, a venturi mixer is used to fully mix it with the oxygen-enriched gas produced in the A6 oxygen-enriching machine, and the mixture is then transported to the oxygen-enriched storage tank to complete the final pressure stabilization. This ensures that the pressure of the produced oxygen-enriched gas is stable and the composition is uniform, meeting the gas quality requirements of kiln combustion. Attached Figure Description

[0018] The following figures illustrate specific embodiments of this application:

[0019] Figure 1This is a schematic diagram of the overall structure of the air separation oxygen generation system described in this utility model;

[0020] The attached diagram is labeled as follows: 1. Compressed air preparation module; 2. Oxygen enrichment machine; 3. PSA nitrogen generator; 4. Stable oxygen production module; 5. Nitrogen collection module; 11. Air filter; 12. Air compressor; 13. Dryer; 14. Cooler; 41. Pressure equalization collection box; 42. Exhaust fan; 43. Second check valve; 44. Venturi mixer; 45. Oxygen enrichment buffer tank; 46. Third regulating valve; 51. Overflow pipe; 52. First check valve; 53. Three-way mixer; 54. Nitrogen enrichment buffer tank; 55. First regulating valve; 61. Fourth regulating valve; 62. Fifth regulating valve; 63. Second regulating valve; 71. Third check valve; 72. Fourth check valve. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0022] Example 1:

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0024] An air separation oxygen production system, such as Figure 1 As shown, it includes:

[0025] The system includes a compressed air preparation module 1, an oxygen enrichment unit 2, a PSA nitrogen generator 3, and a stable oxygen generation module 4. The compressed air preparation module 1 is connected to the oxygen enrichment unit 2 and the PSA nitrogen generator 3 respectively through compressed air pipelines.

[0026] The first outlet of the oxygen enrichment unit 2 is connected to the PSA nitrogen generator 3 through the first nitrogen enrichment pipeline, and the second outlet of the oxygen enrichment unit 2 is connected to the stable oxygen generation module 4 through the first oxygen enrichment pipeline; the first outlet of the PSA nitrogen generator 3 is connected to the stable oxygen generation module 4 through the second oxygen enrichment pipeline, and the second outlet of the PSA nitrogen generator 3 is connected to the oxygen enrichment unit 2 through the second nitrogen enrichment pipeline.

[0027] The air separation oxygen generation system further includes a nitrogen collection module 5, which comprises an overflow pipe 51, a first check valve 52, a three-way mixer 53, a nitrogen enrichment buffer tank 54, and a first regulating valve 55. The nitrogen collection module 5 is connected to the oxygen enrichment unit 2 and the PSA nitrogen generator 3 via a first nitrogen enrichment pipeline and a second nitrogen enrichment pipeline, respectively. A second regulating valve 63 is installed on the overflow pipe 51.

[0028] The oxygen stabilization module 4 includes a pressure equalization collection box 41, an exhaust fan 42, a second check valve 43, a Venturi mixer 44, an oxygen enrichment buffer tank 45, and a third regulating valve 46. A third check valve 71 and a fourth check valve 72 are respectively installed on the first nitrogen enrichment pipeline and the first oxygen enrichment pipeline. The outlet of the first oxygen enrichment pipeline is connected to the Venturi mixer 44. The outlet of the first nitrogen enrichment pipeline is connected to the three-way mixer 53.

[0029] The compressed air preparation module 1 includes an air filter 11, an air compressor 12, a dryer 13, and a cooler 14 connected in sequence via compressed air pipelines. In the compressed air preparation module 1, air first passes through the air filter 11 to remove dust and particulate matter, ensuring air purity; then it is pressurized by the air compressor 12, then enters the dryer 13 to remove moisture, and then flows into the cooler 14 to be cooled to a suitable temperature (35~45℃), forming pressurized raw material compressed air (6~10 bar), which is then used by subsequent separation equipment.

[0030] The generated compressed air is then split into two compressed air sub-pipelines. The compressed air production module 1, connected to the oxygen enrichment unit 2 and the PSA nitrogen generator 3, is equipped with a fourth regulating valve 61 and a fifth regulating valve 62, respectively, which can precisely control the air intake. A portion of the compressed air enters the oxygen enrichment unit 2, where it is separated into oxygen-enriched gas (40% concentration) and nitrogen-enriched gas (85% concentration) according to the different permeation rates of the gas components. The other portion of the compressed air enters the PSA nitrogen generator 3, where the difference in adsorption rates of oxygen and nitrogen molecules by carbon molecular sieves is utilized. Pressure is applied to preferentially adsorb oxygen, resulting in nitrogen enrichment. The nitrogen is then regenerated by depressurization and desorption of the molecular sieves. The dual-tower cycle alternates to continuously produce high-purity nitrogen (99% concentration), and desorption yields pulsed oxygen-enriched gas (30% concentration).

[0031] Next, the nitrogen-enriched gas produced in oxygen-enriching generator 2 and the oxygen-enriched gas produced in PSA nitrogen generator 3 are mixed in a three-way mixer 53 to obtain nitrogen-enriched gas with a concentration of 90-95%. This gas flows into the nitrogen-enriched buffer tank 54 for buffering. This nitrogen-enriched gas can be used as industrial protective gas for coal powder silos, or, depending on actual operating conditions, 99% nitrogen-enriched gas can be used directly after opening the regulating valve. The pulsed oxygen-enriched gas produced by PSA nitrogen generator 3 first enters the pressure equalization collection box 41 for pressure stabilization. After pressure stabilization, the oxygen-enriched gas with a concentration of 30% is transported to the rear end by the exhaust fan 42 and mixed with the oxygen-enriched gas with a concentration of 40% from oxygen-enriching generator 2 in the venturi mixer 44. Finally, oxygen-enriched gas with a concentration of 32%-35% is generated and flows into the oxygen-enriched buffer tank 45 for storage, to be used as combustion aid in kilns in industrial settings such as cement production.

[0032] In this embodiment, both the check valve and the regulating valve are electric or pneumatic valves used to control or shut off the airflow; the air compressor 12 is an oil-free air compressor; an existing commercially available dryer 13 is used to remove moisture from the compressed air (such as a commercially available zero-heat-consumption dryer 13; when using a zero-heat-consumption dryer 13, the system does not need to install a cooler 14); the oxygen enrichment machine 2 is the company's in-house membrane oxygen enrichment skid-mounted A6 oxygen enrichment machine 2. Taking the standard module of the skid-mounted device with model ZOE12-1K as an example, under certain operating conditions, when the pressure of the oxygen-enriched gas produced by a single standard module is 5~15kPa, the oxygen enrichment concentration can reach 40%, and the nitrogen enrichment concentration can reach 91%; the three-way mixer 53 is a commercially available mature three-way mixing valve, or a three-way mixing valve of model ZNG30 series can be used; the venturi mixer 44 can be a ZhengYing VM series product.

[0033] Specific example: Using an air separation oxygen production system, when 1000m³... 3 / h Compressed air enters oxygen enrichment unit 2, 1500m 3 / h Compressed air enters PSA nitrogen generator 3, at which point 32% oxygen-enriched gas can be produced with a flow rate of 1350m³. 3 / h, producing 92% nitrogen-rich gas at a flow rate of 1150m³ / h. 3 / h; when 1000m 3 / h Compressed air enters the oxygen enrichment machine 2,500m 3 / h Compressed air enters PSA nitrogen generator 3, at which point it can produce oxygen-enriched gas with a concentration of 34% and a flow rate of 653m³. 3 / h, producing 90% nitrogen-enriched gas at a flow rate of 847m³ / h. 3 / h.

[0034] This invention integrates PSA nitrogen generation with membrane separation oxygen generation processes to achieve a one-stop coordinated supply of oxygen-enriched and nitrogen-enriched gases. During operation, zero venting of the gas source is achieved through process coupling, and the concentration and flow rate of oxygen and nitrogen can be flexibly adjusted to meet the gas demand of industrial scenarios such as cement kilns, thereby significantly improving overall economic efficiency. First, the pulsed oxygen-enriched gas generated by the PSA nitrogen generator is introduced into the pressure equalization collection tank for preliminary pressure stabilization. Then, a Venturi mixer is used to fully mix it with the oxygen-enriched gas produced in the A6 oxygen enrichment machine, and the mixture is transported to the oxygen enrichment storage tank for final pressure stabilization. This ensures that the pressure of the produced oxygen-enriched gas is stable and the composition is uniform, meeting the gas quality requirements for kiln combustion.

[0035] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An air separation oxygen production system, characterized in that, include: The system includes a compressed air preparation module, an oxygen enrichment unit, a PSA nitrogen generator, and a stable oxygen generation module. The compressed air preparation module is connected to the oxygen enrichment unit and the PSA nitrogen generator via compressed air pipelines. The first outlet of the oxygen enrichment unit is connected to the PSA nitrogen generator via the first nitrogen enrichment pipeline, and the second outlet of the oxygen enrichment unit is connected to the stable oxygen generation module via the first oxygen enrichment pipeline; the first outlet of the PSA nitrogen generator is connected to the stable oxygen generation module via the second oxygen enrichment pipeline, and the second outlet of the PSA nitrogen generator is connected to the oxygen enrichment unit via the second nitrogen enrichment pipeline.

2. The air separation oxygen generation system as described in claim 1, characterized in that, The air separation oxygen generation system further includes a nitrogen collection module, which includes an overflow pipe, a first check valve, a three-way mixer, a nitrogen-enriched buffer tank, and a first regulating valve. The nitrogen collection module is connected to the oxygen enrichment machine and the PSA nitrogen generator through a first nitrogen-enriched pipeline and a second nitrogen-enriched pipeline, respectively. The outlet end of the first nitrogen-enriched pipeline is connected to the three-way mixer.

3. The air separation oxygen production system as described in claim 2, characterized in that, A second regulating valve is installed on the overflow pipe.

4. The air separation oxygen production system as described in claim 1, characterized in that, The compressed air preparation module includes an air filter, an air compressor, a dryer, and a cooler connected in sequence via compressed air pipelines.

5. The air separation oxygen production system as described in claim 1, characterized in that, The oxygen stabilization module includes, in sequence, a pressure equalization collection box, an exhaust fan, a second check valve, a venturi mixer, an oxygen enrichment buffer tank, and a third regulating valve. The outlet end of the first oxygen enrichment pipeline is connected to the venturi mixer.

6. The air separation oxygen production system as described in claim 1, characterized in that, The first nitrogen-enriched pipeline and the first oxygen-enriched pipeline are respectively equipped with a third check valve and a fourth check valve.

7. The air separation oxygen production system as described in claim 1, characterized in that, The compressed air preparation module is connected to the oxygen enrichment machine and the PSA nitrogen generator via compressed air pipelines, which are respectively equipped with a fourth regulating valve and a fifth regulating valve.

Images