Multistage compressed air supply system based on membrane oxygen enrichment
By designing a multi-stage compressed air supply system based on membrane oxygen-rich, the problem of high compressed air pressure requirements for membrane oxygen-rich oxygen production and lower nitrogen-rich gas pressure is solved, and the precise regulation and diversified gas pressure are achieved. Adaptation reduces costs and energy consumption, and improves the efficiency and safety of industrial production.
Patent Information
- Application Number
- CN202421546147.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-07-02
AI Technical Summary
In the prior art, the pressure of oxygen-rich membrane oxygen production is high for compressed air, resulting in the need of multiple compressors with different powers to increase equipment investment and maintenance complexity. At the same time, the pressure of nitrogen-rich gases drops and cannot be directly transported into the compressed air pipe network. , the pressurization needs to be re-pressurized through booster equipment to increase energy consumption and operating costs.
A multi-stage compressed air supply system based on membrane oxygen-rich is designed, including compressed air module, membrane oxygen-rich gas production module and hierarchical gas supply module. The precision adjustment of gas pressure is achieved through multi-stage pressure reducing valves and control valves, and the gas pressure is directly adjusted. Incorporating nitrogen-rich gas into medium and low pressure compressed air pipelines reduces dependence on booster equipment.
The system significantly improves adaptability to diversified gas pressure demands, reduces equipment investment and maintenance costs, reduces energy consumption, and improves industrial production efficiency and safety.
Smart Images
Figure CN222437678U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of gas separation, in particular to a multi-stage compressed air supply system based on membrane oxygen enrichment. Background Art
[0002] In most industrial installations involving combustion processes or inert atmosphere production processes, there is a demand for compressed air, oxygen-enriched and nitrogen-enriched gases, and air compressors and membrane oxygen enrichment technology are usually used. The principle of air membrane oxygen enrichment technology is to separate the components in the gas on the surface of the polymer membrane under the drive of gas pressure by virtue of the adsorption capacity of each component in the gas on the surface of the polymer membrane and the difference in permeation rate. The gas molecules are first adsorbed and dissolved on the high-pressure side surface of the membrane, then diffuse in the membrane with the help of the concentration gradient, and finally resolve from the low-pressure side of the membrane. Small molecules and molecules with strong polarity, such as "oxygen molecules", pass through faster, while large molecules and molecules with weak polarity, such as "nitrogen molecules", pass through slower. This technology uses the different permeation rates of various gases on the polymer membrane to achieve gas separation. The driving force for separation is the partial pressure difference of the gas on both sides of the membrane, so the membrane oxygen enrichment technology has no phase change and does not require regeneration. It has the advantages of simple equipment, low operation and maintenance costs, etc.
[0003] In the actual operation of industrial production equipment, membrane oxygen-enriched oxygen production has high requirements for the pressure of compressed air; at the same time, medium and low pressure compressed air is also indispensable. In order to meet the above requirements, traditional processes often need to be equipped with a variety of compressors of different powers, which not only increases the equipment investment cost, but also increases the complexity of maintenance and management. In addition, in the process of membrane oxygen enrichment, the pressure of the output nitrogen-rich gas will decrease and cannot be directly connected to the original compressed air pipeline network. Therefore, it is usually necessary to re-pressurize the gas through boosting equipment such as blowers. This step not only leads to an increase in energy consumption, but also increases the overall operating cost. Utility Model Content
[0004] The technical problem to be solved by the utility model is to overcome the deficiencies in the prior art and provide a multi-stage compressed air supply system based on membrane oxygen enrichment.
[0005] To solve the technical problem, the solution of the utility model is:
[0006] A multi-stage compressed air supply system based on membrane oxygen enrichment is provided, comprising a compressed air module, a membrane oxygen enrichment gas production module and a staged air supply module; wherein:
[0007] The compressed air module includes an air filter, an air compression station and a dryer which are connected in sequence through pipelines. The dryer outlet is connected to two primary air branch pipelines, which are connected to the membrane oxygen-enriched gas production module and the graded air supply module respectively.
[0008] The membrane oxygen-enriched gas production module includes a heat exchanger, a membrane oxygen-enriched skid-mounted device and an oxygen-enriched gas storage tank connected in sequence through pipelines; the nitrogen-enriched gas outlet of the membrane oxygen-enriched skid-mounted device is connected to the nitrogen-enriched gas storage tank in the graded gas supply module;
[0009] The graded gas supply module includes a nitrogen-rich gas storage tank, at the outlet of which two first-level nitrogen-rich branch pipelines are connected in parallel, and a first-level nitrogen-rich pressure reducing valve is arranged on one of the first-level nitrogen-rich branch pipelines, and the other is used for directly supplying gas to the outside; two second-level nitrogen-rich branch pipelines are connected in parallel at the end of the pipeline after the first-level nitrogen-rich pressure reducing valve, and a second-level nitrogen-rich pressure reducing valve is arranged on one of the second-level nitrogen-rich branch pipelines; a first-level air pressure reducing valve is arranged on the first-level air branch pipeline connected to the graded gas supply module at the outlet of the dryer, and two second-level air branch pipelines are connected in parallel at the end of the pipeline after the pressure reducing valve; a second-level air pressure reducing valve is arranged on one of the second-level air branch pipelines, and the pipeline is connected in parallel with the pipeline where the second-level nitrogen-rich pressure reducing valve is located, and the connected pipeline is used for supplying gas to the outside; the other second-level air branch pipeline without a pressure reducing valve is connected in parallel with the second-level nitrogen branch pipeline without a pressure reducing valve, and the connected pipeline is used for supplying gas to the outside.
[0010] As an improved solution, the pipeline at the outlet of the oxygen-rich gas storage tank is connected to the kiln for providing oxygen-rich gas; the exhaust outlet of the kiln is connected to the heat exchanger through a hot gas pipeline for providing hot gas as a heat exchange medium, and the hot gas exhaust port on the heat exchanger is connected to the atmosphere.
[0011] As an improvement plan, regulating valves are respectively provided on the pipeline between the heat exchanger and the membrane oxygen-enriched skid-mounted device, on the pipeline between the oxygen-enriched gas storage tank and the kiln, and on the hot gas pipeline.
[0012] As an improved solution, regulating valves are respectively provided on the two primary air branch pipelines and the two secondary air branch pipelines, and the regulating valves are located before the primary air pressure reducing valve or the secondary air pressure reducing valve.
[0013] As an improved solution, control valves are respectively provided on the two primary nitrogen-rich branch pipelines and the two secondary nitrogen-rich branch pipelines, and the control valves are located before the primary nitrogen-rich pressure reducing valve or the secondary nitrogen-rich pressure reducing valve.
[0014] As an improved solution, the first-stage air pressure reducing valve, the second-stage air pressure reducing valve, the first-stage nitrogen-rich pressure reducing valve and the second-stage nitrogen-rich pressure reducing valve are all electrically controlled valves, which are respectively connected to valve controllers via signal lines, and the valve controllers are connected to a host computer via signal lines.
[0015] As an improved solution, the first-stage air pressure reducing valve, the second-stage air pressure reducing valve, the first-stage nitrogen-rich pressure reducing valve and the second-stage nitrogen-rich pressure reducing valve are all pilot-operated pressure reducing valves.
[0016] As an improvement scheme, temperature sensors and pressure sensors are provided on the oxygen-rich gas storage tank and the nitrogen-rich gas storage tank, a temperature sensor is provided on the pipeline between the heat exchanger and the membrane oxygen-enriched skid-mounted device, and a pressure sensor is provided on each external gas supply pipeline; pressure sensors are provided at the outlet ends of the control valves on the two primary air branch pipelines; and each sensor is connected to the host computer through a signal line.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] 1. The utility model significantly improves the adaptability of the air compressor station to the diversified gas pressure requirements in industrial production through a multi-stage compressed air pressure regulation system. The system can accurately meet the special requirements of various process flows. Whether it is the high pressure standard for compressed air in membrane oxygen enrichment or the pressure requirements determined according to specific circumstances in industrial production, the utility model can achieve it through an air compressor station without the need to add additional air compressor stations of different powers, achieving cost reduction and efficiency improvement while also reducing the burden of user maintenance and management.
[0019] 2. After achieving membrane oxygen-enriched separation, the utility model directly integrates the generated nitrogen-enriched gas into the medium-pressure or low-pressure compressed air pipeline without the need for additional booster equipment. This integration method effectively provides medium-pressure compressed air for purging and cleaning of equipment in industrial production, ensuring that the product is protected from contamination or damage. At the same time, low-pressure compressed air is directly used in the cooling process of the equipment, further improving the efficiency and safety of industrial production. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the membrane oxygen-enriched multi-stage compressed air supply system of the utility model.
[0021] The reference numerals in the drawings are: air filter 1; air compression station 2; dryer 3; heat exchanger 4; primary air pressure reducing valve 5; secondary air pressure reducing valve 6; membrane oxygen enrichment skid-mounted device 7; regulating valves 801-811; oxygen-rich gas storage tank 9; nitrogen-rich gas storage tank 10; kiln 11; primary nitrogen-rich pressure reducing valve 12; secondary nitrogen-rich pressure reducing valve 13. DETAILED DESCRIPTION
[0022] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings.
[0023] Part I. Structural Layout of the Device
[0024] The membrane oxygen-enriched multi-stage compressed air supply system of the utility model has a specific structure as follows: Figure 1 As shown. From a functional perspective, the system includes a compressed air module, a membrane oxygen-enriched gas production module and a graded gas supply module. Among them:
[0025] The compressed air module includes an air filter 1, an air compressor station 2 and a dryer 3 connected in sequence through pipelines. The end of the dryer outlet pipeline is connected to two primary air branch pipelines, and each is provided with a regulating valve 809 and 810. Among them, the end of the pipeline corresponding to the regulating valve 809 is connected to the membrane oxygen-enriched gas production module, and the end of the pipeline corresponding to the regulating valve 810 is connected to the graded gas supply module.
[0026] The membrane oxygen-enriched gas production module includes a heat exchanger 4, a membrane oxygen-enriched skid-mounted device 7, an oxygen-enriched gas storage tank 9 and a kiln 11 connected in sequence through a primary air branch pipeline. The pipeline at the outlet of the heat exchanger 4 and the oxygen-enriched outlet pipeline of the membrane oxygen-enriched skid-mounted device 7 are respectively provided with control valves 803 and 807, and the nitrogen-enriched outlet pipeline of the membrane oxygen-enriched skid-mounted device 7 is connected to the nitrogen-enriched gas storage tank 10 in the graded gas supply module. The oxygen-enriched gas storage tank 9 provides oxygen-enriched gas to the kiln 11 through a pipeline, and the exhaust outlet of the kiln 11 is connected to the heat exchanger 4 through a hot gas pipeline for providing hot gas as a heat exchange medium, and the hot gas discharge port on the heat exchanger 4 is connected to the atmosphere. A control valve 803 is provided on the pipeline between the heat exchanger 4 and the membrane oxygen-enriched skid-mounted device 7, a control valve 807 is provided on the pipeline between the oxygen-enriched gas storage tank 9 and the kiln 11, and a control valve 808 is provided on the hot gas pipeline.
[0027] The graded gas supply module includes a nitrogen-rich gas storage tank 10 and a multi-stage pipeline. Among them, two primary nitrogen-rich branch pipelines are connected to the outlet of the nitrogen-rich gas storage tank 10, and a primary nitrogen-rich pressure reducing valve 12 is provided on one of the primary nitrogen-rich branches, and the other is used for direct external gas supply; two secondary nitrogen-rich branch pipelines are connected to the end of the pipeline after the primary nitrogen-rich pressure reducing valve 12, and a secondary nitrogen-rich pressure reducing valve 13 is provided on one of the secondary nitrogen-rich branch pipelines; a primary air pressure reducing valve 5 is provided on the primary air branch pipeline connected to the graded gas supply module at the outlet of the dryer 3, and two secondary air branch pipelines are connected to the end of the pipeline after the primary air pressure reducing valve 5; a secondary air pressure reducing valve 6 is provided on one of the secondary air branch pipelines, and the pipeline is connected to the pipeline where the secondary nitrogen-rich pressure reducing valve 13 is located, and the connected pipeline is used for external gas supply; another secondary air branch pipeline without a pressure reducing valve is connected to the secondary nitrogen-rich branch pipeline without a pressure reducing valve, and the connected pipeline is used for external gas supply.
[0028] A regulating valve 810 is provided on the primary air branch pipeline before the primary air pressure reducing valve 5, and a regulating valve 801 is provided on the secondary air branch pipeline before the secondary air pressure reducing valve 6. Regulating valves 809 and 802 are provided on the other primary air branch pipelines and the secondary air branch pipelines, respectively. A regulating valve 805 is provided on the primary nitrogen-rich branch pipeline before the primary nitrogen-rich pressure reducing valve 12, and a regulating valve 811 is provided on the secondary nitrogen-rich branch pipeline before the secondary nitrogen-rich pressure reducing valve 13. Regulating valves 804 and 806 are provided on the other primary nitrogen-rich branch pipelines and the secondary nitrogen-rich branch pipelines, respectively.
[0029] As an example, several pressure reducing valves can be selected as pilot pressure reducing valves. The first-level air pressure reducing valve 5, the second-level air pressure reducing valve 6, the first-level nitrogen-enriched pressure reducing valve 12 and the second-level nitrogen-enriched pressure reducing valve 13 are all electrically controlled valves, which are respectively connected to the valve controller through signal lines, and the valve controller is connected to the host computer through signal lines. According to the preset control strategy or manual method, each control valve can be used to control the gas flow in each pipeline or shut off the gas flow.
[0030] In order to adjust the opening of the control valve according to the gas temperature and pressure in the system, temperature sensors and pressure sensors are provided on the oxygen-rich gas storage tank 9 and the nitrogen-rich gas storage tank 10, a temperature sensor is provided on the pipeline between the heat exchanger 4 and the membrane oxygen-enriched skid-mounted device 7, and pressure sensors are provided on each external gas supply pipeline; pressure sensors are provided at the outlet ends of the control valves 809 and 810 on the two primary air branch pipelines; and each sensor is connected to the host computer through a signal line.
[0031] In the present invention, the dryer 3 is mainly used to remove moisture from the compressed air, and mature technology (such as the compression heat zero gas consumption dryer on the market) can be used. The heat exchanger 4 can adopt the mature shell and tube, sheet or plate heat exchanger and other products on the market. The membrane oxygen enrichment skid-mounted device 7 preferably adopts the skid-mounted device standard module of model ZOE12-1K. Under certain operating conditions, when the pressure of a single standard module outputs oxygen-enriched gas is 300kPa, the oxygen enrichment flow rate is about 550Nm 3 / h, oxygen enrichment concentration reaches 39%.
[0032] Part 2. Device Operation Method Description
[0033] In the compressed air production module, the air is filtered through the air filter 1 for dust removal and water removal and then flows into the air compression station 2. The compressed air with a pressure of 8 to 9 bar is produced by the air compression station 2, and then enters the dryer 3 for drying and water removal, and finally obtains the finished compressed air of 8 to 9 bar for use in subsequent processes. Next, the compressed air obtained in the compressed air production module flows into two branch pipelines after passing through the regulating valve 809 and the regulating valve 810, respectively, as the raw gas for membrane oxygen-enriched gas production and compressed air supply gas.
[0034] In the membrane oxygen-enriched gas production module, the compressed air passes through the control valve 809 and flows through the heat exchanger 4 for heat exchange, and its heat source comes from the hot exhaust gas discharged from the kiln. According to the physical characteristics of the membrane group in the membrane oxygen-enriched skid-mounted device 7, when the compressed air intake volume is the same, the higher the temperature of the compressed air, the greater the amount of oxygen-enriched gas produced by the membrane oxygen-enriched skid-mounted device 7, which can increase the equivalent oxygen production; then, the heated compressed air flows into the membrane oxygen-enriched skid-mounted device 7 after passing through the control valve 803 to perform the membrane oxygen-enriched process. In the membrane oxygen-enriched skid-mounted device 7, due to the different permeation rates of the components (mainly oxygen and nitrogen) in the compressed air when passing through the membrane, driven by the pressure difference, the oxygen in the compressed air is preferentially passed through the membrane and collected to obtain an oxygen-enriched gas with a pressure of 300 kPa and a concentration of 39%, which flows into the oxygen-enriched gas storage tank 9 for buffering; while the nitrogen that does not pass through the membrane flows into the nitrogen-enriched gas storage tank 10 through the nitrogen-enriched outlet pipeline for buffering, obtaining a nitrogen-enriched gas with a pressure of 7.5-8.5 bar and a concentration of 90-95%.
[0035] The buffered nitrogen-rich gas flows into the nitrogen branch corresponding to the regulating valve 804 and can be directly supplied to users as finished nitrogen-rich product. In addition, the nitrogen-rich gas flows into the nitrogen branch corresponding to the regulating valve 805 and can be mixed with compressed air after pressure reduction to be used as functional compressed air for industrial processes.
[0036] After the compressed air obtained in the compressed air production module passes through the control valve 810, it is pressure-regulated once through the primary air pressure reducing valve 5 to obtain compressed air with a pressure of 3 to 5 bar, and then flows to the end of the secondary air branch pipeline after passing through the control valve 802. At the same time, the nitrogen-rich gas stored in the nitrogen-rich gas storage tank 10 flows through the control valve 805 for control, and then flows to the pipeline corresponding to the control valve 806 after being reduced in pressure through the primary nitrogen-rich pressure reducing valve 12, and finally obtains 4 to 6 bar nitrogen-rich gas; it is mixed with the 3 to 5 bar compressed air of the secondary air branch pipeline to obtain medium-pressure compressed air, which can be used for purging and cleaning of equipment in industrial production to avoid contamination or damage to the product. At the same time, the compressed air and nitrogen-rich gas after the primary pressure regulation are respectively pressure-regulated twice through the secondary air pressure reducing valve 6 and the secondary nitrogen-rich pressure reducing valve 13, respectively, to obtain compressed air of about 1 bar and nitrogen-rich gas of about 2 bar, and low-pressure compressed air is obtained after mixing, which can be used for cooling equipment in industrial production.
[0037] Based on the technical common sense in this field, during the specific use of the system, the user can also adjust the pressure of the compressed air and nitrogen-rich gas through the corresponding pressure regulating valve according to the actual working conditions.
Claims
1. A multi-stage compressed air supply system based on membrane oxygen enrichment, characterized in that: It includes a compressed air module, a membrane oxygen-enriched gas production module and a graded gas supply module; wherein, The compressed air module includes an air filter, an air compression station and a dryer which are connected in sequence through pipelines. The dryer outlet is connected to two primary air branch pipelines, which are connected to the membrane oxygen-enriched gas production module and the graded air supply module respectively. The membrane oxygen-enriched gas production module includes a heat exchanger, a membrane oxygen-enriched skid-mounted device and an oxygen-enriched gas storage tank connected in sequence through pipelines; the nitrogen-enriched gas outlet of the membrane oxygen-enriched skid-mounted device is connected to the nitrogen-enriched gas storage tank in the graded gas supply module; The graded gas supply module includes a nitrogen-rich gas storage tank, at the outlet of which two first-level nitrogen-rich branch pipelines are connected in parallel, and a first-level nitrogen-rich pressure reducing valve is arranged on one of the first-level nitrogen-rich branch pipelines, and the other is used for directly supplying gas to the outside; two second-level nitrogen-rich branch pipelines are connected in parallel at the end of the pipeline after the first-level nitrogen-rich pressure reducing valve, and a second-level nitrogen-rich pressure reducing valve is arranged on one of the second-level nitrogen-rich branch pipelines; a first-level air pressure reducing valve is arranged on the first-level air branch pipeline connected to the graded gas supply module at the outlet of the dryer, and two second-level air branch pipelines are connected in parallel at the end of the pipeline after the pressure reducing valve; a second-level air pressure reducing valve is arranged on one of the second-level air branch pipelines, and the pipeline is connected in parallel with the pipeline where the second-level nitrogen-rich pressure reducing valve is located, and the connected pipeline is used for supplying gas to the outside; the other second-level air branch pipeline without a pressure reducing valve is connected in parallel with the second-level nitrogen branch pipeline without a pressure reducing valve, and the connected pipeline is used for supplying gas to the outside.
2. The multi-stage compressed air supply system based on membrane oxygen enrichment according to claim 1, characterized in that: The pipeline of the oxygen-enriched gas storage tank outlet is connected to the kiln for providing oxygen-enriched gas; the exhaust outlet of the kiln is connected to the heat exchanger through the hot gas pipeline for providing hot gas as a heat exchange medium, and the hot gas exhaust port on the heat exchanger is connected to the atmosphere.
3. The multi-stage compressed air supply system based on membrane oxygen enrichment according to claim 2, characterized in that: Control valves are respectively installed on the pipeline between the heat exchanger and the membrane oxygen-enriched skid-mounted device, on the pipeline between the oxygen-enriched gas storage tank and the kiln, and on the hot gas pipeline.
4. The multi-stage compressed air supply system based on membrane oxygen enrichment according to claim 1, characterized in that: Control valves are respectively arranged on the two primary air branch pipelines and the two secondary air branch pipelines, and the control valves are located before the primary air pressure reducing valve or the secondary air pressure reducing valve.
5. The multi-stage compressed air supply system based on membrane oxygen enrichment according to claim 1, characterized in that: Control valves are respectively arranged on the two primary nitrogen-rich branch pipelines and the two secondary nitrogen-rich branch pipelines, and the control valves are located before the primary nitrogen-rich pressure reducing valve or the secondary nitrogen-rich pressure reducing valve.
6. The multi-stage compressed air supply system based on membrane oxygen enrichment according to any one of claims 1 to 5, characterized in that: The first-stage air pressure reducing valve, the second-stage air pressure reducing valve, the first-stage nitrogen-rich pressure reducing valve and the second-stage nitrogen-rich pressure reducing valve are all electrically controlled valves, which are respectively connected to valve controllers via signal lines, and the valve controllers are connected to a host computer via signal lines.
7. The multi-stage compressed air supply system based on membrane oxygen enrichment according to any one of claims 1 to 5, characterized in that: The first-stage air pressure reducing valve, the second-stage air pressure reducing valve, the first-stage nitrogen-rich pressure reducing valve and the second-stage nitrogen-rich pressure reducing valve are all pilot-operated pressure reducing valves.
8. The multi-stage compressed air supply system based on membrane oxygen enrichment according to any one of claims 1 to 5, characterized in that: Temperature sensors and pressure sensors are provided on the oxygen-rich gas storage tank and the nitrogen-rich gas storage tank, a temperature sensor is provided on the pipeline between the heat exchanger and the membrane oxygen-enriched skid-mounted device, and pressure sensors are provided on each external gas supply pipeline; pressure sensors are provided at the outlet ends of the control valves on the two primary air branch pipelines; each sensor is connected to the host computer through a signal line.