Tower-free safety type oxygen enrichment device

Abstract

The utility model discloses a towerless safety type oxygen enrichment device which comprises a blast pipeline, a pressure swing adsorption module, an oxygen enrichment pipeline, an air pipeline and an automatic control module, the tail end of the blast pipeline is connected and communicated with the pressure swing adsorption module, and the oxygen outlet end of the pressure swing adsorption module is communicated with the oxygen enrichment pipeline; a third regulation and control valve, a mixing valve and an oxygen concentration sensor are sequentially arranged on the oxygen-enriched pipeline; an air filtering module and an adjusting valve are sequentially connected to the air pipeline, the air outlet end of the air pipeline is communicated with the mixing valve, and the automatic control module is in communication connection with the oxygen concentration sensor and the adjusting valve. According to the oxygen enrichment device, the opening degree of the valve is accurately adjusted through the automatic control module, the oxygen enrichment flow and the oxygen enrichment concentration can be flexibly prepared, and the diversified application requirements of the oxygen enrichment device in industrial scenes are met.

Description

Technical Field

[0001] The utility model relates to the technical field of gas separation, in particular to a tower-free safe oxygen enrichment device. Background Art

[0002] Vacuum pressure swing adsorption (VPSA) utilizes the differential adsorption capacities of adsorbents such as lithium-based molecular sieves for different air components to separate and purify oxygen under varying pressures. Compared to traditional oxygen production methods, VPSA technology offers advantages such as ease of operation, high efficiency, and high oxygen concentration. Consequently, it has gained widespread application in the chemical, metallurgical, building materials, and medical fields.

[0003] Traditional VPSA technology typically uses a pressure vessel adsorption tower as the separation equipment. Although this can achieve oxygen separation and purification, the large adsorption tower also increases the overall complexity and safety of the equipment. Chinese patent CN118236811A solves the safety issues of pressure vessels through tower-less VPSA technology.

[0004] However, in large-scale industrial production environments, the direct production of high-concentration oxygen (around 93%) using VPSA is strictly controlled due to its inherent hazards. This production requires strict registration procedures. Furthermore, the inherent safety hazards of high-concentration oxygen-enriched gas further complicate its implementation, hindering its widespread adoption. In recent years, a large number of industrial oxygen-enriched combustion scenarios have required oxygen-enriched gas with an oxygen concentration of approximately 30%. Therefore, devices that directly and efficiently produce oxygen-enriched gas with a concentration of 30% to 50% offer high economic benefits. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies in the existing VPSA technology and provide a tower-free VPSA oxygen enrichment device.

[0006] In order to solve the above technical problems, the present invention is specifically solved by the following technical solutions:

[0007] A towerless safe oxygen enrichment device comprises an air blast pipeline, a pressure swing adsorption module, an oxygen enrichment pipeline, an air pipeline and an automatic control module. The end of the air blast pipeline is connected to the pressure swing adsorption module, and the oxygen outlet end of the pressure swing adsorption module is connected to the oxygen enrichment pipeline. A third regulating valve, a mixing valve and an oxygen concentration sensor are sequentially provided on the oxygen enrichment pipeline. An air filter module and a regulating valve are sequentially connected to the air pipeline. The air outlet end of the air pipeline is connected to the mixing valve. The automatic control module is respectively in communication with the oxygen concentration sensor and the regulating valve.

[0008] Preferably, the blower pipeline is provided with a first air filter, a first blower, a cooler and a first regulating valve in sequence.

[0009] Preferably, the air filtration module includes a second air filter and a second blower, and the second blower is connected to the second air filter and the regulating valve respectively.

[0010] Preferably, it also includes an exhaust gas pipeline, and the inlet end of the exhaust gas pipeline is connected to the exhaust gas outlet end of the pressure swing adsorption module.

[0011] Preferably, the exhaust gas pipeline is provided with a second regulating valve, a vacuum pump and a muffler at the end.

[0012] Preferably, the second control valve, the third control valve and the regulating valve are implemented as electric valves or pneumatic valves.

[0013] Preferably, the first control valve is implemented as an electric valve or a pneumatic valve.

[0014] Preferably, the automatic control module includes a controller and an actuator, and the actuator is connected to the regulating valve.

[0015] Preferably, the controller is implemented as a DDC or PLC controller.

[0016] Preferably, the controller is electrically connected to the oxygen concentration sensor and the actuator respectively.

[0017] The utility model has the beneficial effects:

[0018] This device accurately adjusts the valve opening through the automatic control module, and can flexibly control the oxygen enrichment flow and concentration, improving the diversified application needs of oxygen enrichment devices in industrial scenarios.

[0019] Based on the towerless VPSA oxygen production technology, this device further enhances the safety and flexibility of the device based on the mixing mode of medium and low concentration oxygen enrichment. In addition, by mixing air with high concentration oxygen-enriched gas, the gas output of the finished oxygen-enriched product is increased, and it can also adapt to various low concentration oxygen-enriched combustion applications, achieving a win-win situation of safety, efficiency and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 This is a schematic diagram of the overall structure of the utility model's tower-less safe oxygen enrichment device;

[0022] Figure 2 It is a flow chart of the automatic control module of the utility model.

[0023] The accompanying drawings are marked as follows: 101, blower pipe; 102, exhaust pipe; 103, oxygen enrichment pipe; 104, air pipe; 201, first air filter; 202, second air filter; 3, first blower; 4, cooler; 5, pressure swing adsorption module; 601, first control valve; 602, second control valve; 603, second control valve; 7, vacuum pump; 8, muffler; 9, second blower; 10, regulating valve; 11, mixing valve; 12, oxygen concentration sensor; 14, controller; 15, actuator. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not limit the scope of protection of the present invention.

[0025] It should be noted that the terms "first" and "second" herein do not represent specific quantities or orders, but are merely used to distinguish names. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] The specific implementation of the present utility model is described in detail below with reference to the accompanying drawings.

[0028] (I) Description of the structural layout of the first part of the device:

[0029] The specific structure of a tower-free safe oxygen enrichment device is as follows: Figure 1 As shown, it includes a blast pipeline 101, a pressure swing adsorption module 5, an oxygen enrichment pipeline 103, an air pipeline 104, and an automatic control module. The end of the blast pipeline 101 is connected to the pressure swing adsorption module 5, and the oxygen outlet end of the pressure swing adsorption module 5 is connected to the oxygen enrichment pipeline 103. The pressure swing adsorption module 5 can produce oxygen-enriched gas with a concentration of about 93% and output it through the oxygen enrichment pipeline 103. The oxygen enrichment pipeline 104 is sequentially provided with a third control valve 603, a mixing valve 11, and an oxygen concentration sensor 12.

[0030] The air pipeline is connected to an air filter module and a regulating valve 10 in sequence. The air outlet end of the air pipeline 104 is connected to the mixing valve 11. The automatic control module is communicated with the oxygen concentration sensor 12 and the regulating valve 10 respectively. By analyzing the data transmitted by the current oxygen concentration sensor 12, it determines whether to control the regulating valve 10.

[0031] The air blast pipeline is provided with a first air filter 201 , a first blower 3 , a cooler 4 and a first regulating valve 601 in sequence.

[0032] The air filtration module includes a second air filter 202 and a second blower 9 , and the second blower 9 is connected to the second air filter 202 and the regulating valve 10 respectively.

[0033] The system further includes an exhaust gas pipeline 102, the inlet of which is connected to the exhaust outlet of the pressure swing adsorption module 5. Desorbed gas (e.g., nitrogen) from the pressure swing adsorption module 5 is discharged through the exhaust gas pipeline 102. The exhaust gas pipeline 102 is equipped with a second control valve 602, a vacuum pump 7, and a muffler 8 at its end.

[0034] The automatic control module includes a controller 14 and an actuator 15. The controller 14 is a DDC or PLC controller, which is electrically connected to the oxygen concentration sensor 12 and the actuator 15 respectively. It receives data signals from the oxygen concentration sensor 12 and processes these data according to a preset program or algorithm. At the same time, the actuator 15 receives the control signal from the controller 14 and converts it into mechanical motion or other forms of energy output, thereby realizing automatic control of each valve.

[0035] Among them, the pressure swing adsorption module 5 preferably adopts the technical structure of Chinese patent CN118236811A. The specifications of the oxygen adsorption tube in the pressure swing adsorption module 5 are: the total axial length is 700mm, the inner diameter of the end is 200mm, and its internal geometric volume is about 0.023m3 and must be less than 0.025m 3 (According to the standard specifications, it is a non-pressure vessel); assuming that a standard pressure swing adsorption module 5 is composed of three adsorption sub-modules, and each adsorption sub-module is installed with four oxygen production adsorption tubes, a standard pressure swing adsorption module 5 can produce about 250Nm3 / h of oxygen with a concentration of 90%. The safety hazards of the pressure vessel in the traditional VPSA are solved through the towerless VPSA oxygen production system. Since the technical content of the pressure swing adsorption module 5 is existing technology, it will not be repeated here.

[0036] The number of adsorption submodules in the pressure swing adsorption module 5 may be two, three or more.

[0037] In the present application, the first control valve 601 , the second control valve 602 , the third control valve 603 and the regulating valve 10 are all electrically controlled valves or pneumatic valves for controlling or shutting off the airflow.

[0038] The first blower 3 and the second blower 9 are both high-efficiency blowers, and can be mature products on the market, including magnetic suspension or air suspension blowers.

[0039] The vacuum pump 7 preferably uses a mature magnetic levitation vacuum pump, a vortex vacuum pump or an air levitation vacuum pump on the market.

[0040] The mixing valve 11 may be a mature three-way mixing valve on the market, or a three-way mixing valve of the ZNG30 series.

[0041] (II) Description of the second part of the device operation method:

[0042] After the air passes through the first air filter 201 to remove dust particles to ensure air purity and prevent clogging of the adsorbent, the blower 3 is then operated to pressurize the air to 1-3 bar before being conveyed to the cooler 4. There, the air is cooled to an appropriate temperature (35-45°C) and then supplied as pressurized feed air to the subsequent pressure swing adsorption module 5 for the vacuum pressure swing adsorption oxygen production process.

[0043] In the pressure swing adsorption module 5, moisture, carbon dioxide and a small amount of other gas components in the raw air are adsorbed by the activated alumina loaded at the bottom of the oxygen production adsorption tube at the inlet, and then the nitrogen is adsorbed by the zeolite molecular sieve in the oxygen production adsorption tube, while oxygen and other non-adsorbable components are discharged into the oxygen exhaust pipe from the top outlet of the oxygen production adsorption tube as product gas, thereby producing an oxygen-rich gas with a concentration of about 90% and flowing out through the oxygen-rich pipeline 103 after passing through the third control valve 603; when the zeolite molecular sieve reaches a saturated state, the nitrogen and other gas components in the zeolite molecular sieve will be sucked out of the pipeline by the vacuum pump 7 in the exhaust gas pipeline 102. In view of the fact that the noise generated during the nitrogen discharge process is relatively significant, in order to ensure that the discharge meets environmental protection requirements, it is preferably required to be subjected to noise reduction treatment through the muffler 8 before being discharged into the atmosphere.

[0044] At the same time, air is introduced into air pipeline 104 and passed through second air filter 202 for dust removal. The cleaned air is pressurized by second blower 9 to form pressurized finished air with a pressure of 1-2 bar. This pressurized air is then flow-regulated by regulating valve 10 before being delivered to mixing valve 11 for further processing. Inside mixing valve 11, the oxygen-enriched gas (90% concentration) produced in pressure swing adsorption module 5 is mixed and diluted with the treated finished air. At this point, the pressure of the finished air is slightly higher than that of the oxygen-enriched gas. In this example, the final result is finished oxygen-enriched gas with a concentration of less than 50%. The finished oxygen-enriched gas then flows into the rear end of oxygen-enriched pipeline 103 and is provided to users as the final finished oxygen-enriched gas.

[0045] To ensure stable operation and precise control, the device is equipped with an oxygen concentration sensor 12 to monitor and measure the oxygen concentration of the finished product after blending in real time. The controller 14 and actuator 15 (automatic control module) work together to precisely control and optimize each valve, thereby achieving accurate control of the air flow in the air line 104. This function not only simplifies operation but also allows users to adjust the oxygen concentration of the finished product as needed, easily lowering or increasing it.

[0046] For example, a pressure swing adsorption module 5 can continuously produce oxygen with a concentration of about 90% under its standard configuration, with an output of about 250Nm³ / h. During this process, the second blower 9 is started, and the air flow entering the mixing valve 11 is precisely controlled by adjusting the opening of the regulating valve 10 thereafter to ensure that the supply gas volume reaches about 345Nm³ / h. Subsequently, this air is directed to the mixing valve 11 and mixed with oxygen with a concentration of 90%, and finally an oxygen-rich gas with a concentration precisely maintained at 50% is produced to meet the needs of various applications. During use, the opening of the regulating valve 10 is precisely controlled by the automatic control module, which can effectively adjust the air flow and accurately mix it with high-concentration oxygen, thereby flexibly reducing the oxygen concentration and increasing the overall gas volume while meeting the diverse oxygen-rich concentration requirements in industrial scenarios.

[0047] Based on the towerless VPSA oxygen production technology, this device further enhances the safety and flexibility of the device through the mixed mode of medium and low concentration oxygen enrichment. In addition, by mixing air with high concentration oxygen-enriched gas, the gas production flow rate of the finished oxygen-enriched product is increased, adapting to various low concentration oxygen-enriched combustion applications, and achieving a win-win situation of safety, efficiency and economy.

Claims

1. A tower-free safe oxygen enrichment device, characterized in that: It includes an air blast pipeline, a pressure swing adsorption module, an oxygen enrichment pipeline, an air pipeline and an automatic control module. The end of the air blast pipeline is connected to the pressure swing adsorption module, and the oxygen outlet end of the pressure swing adsorption module is connected to the oxygen enrichment pipeline. The oxygen-enriched pipeline is provided with a third regulating valve, a mixing valve and an oxygen concentration sensor in sequence; The air pipeline is sequentially connected with an air filter module and a regulating valve, an air outlet end of the air pipeline is connected to the mixing valve, and the automatic control module is respectively communicated with the oxygen concentration sensor and the regulating valve.

2. A tower-free safe oxygen enrichment device according to claim 1, characterized in that: The blast pipeline is provided with a first air filter, a first blower, a cooler and a first regulating valve in sequence.

3. A tower-free safe oxygen enrichment device according to claim 1, characterized in that: The air filter module includes a second air filter and a second blower, and the second blower is connected to the second air filter and the regulating valve respectively.

4. A tower-free safe oxygen enrichment device according to claim 1, characterized in that: It also includes an exhaust gas pipeline, the inlet end of the exhaust gas pipeline is connected to the exhaust outlet end of the pressure swing adsorption module.

5. A tower-free safe oxygen enrichment device according to claim 4, characterized in that: The exhaust gas pipeline is provided with a second regulating valve, a vacuum pump and a muffler at the end.

6. A tower-free safe oxygen enrichment device according to claim 5, characterized in that: The second control valve, the third control valve and the regulating valve are implemented as electric valves or pneumatic valves.

7. A tower-free safe oxygen enrichment device according to claim 2, characterized in that: The first control valve is implemented as an electric valve or a pneumatic valve.

8. A tower-free safe oxygen enrichment device according to claim 1, characterized in that: The automatic control module includes a controller and an actuator, and the actuator is connected to the regulating valve.

9. A tower-free safe oxygen enrichment device according to claim 8, characterized in that: The controller is implemented as a DDC or PLC controller.

10. The tower-free safe oxygen enrichment device according to claim 8, characterized in that: The controller is electrically connected to the oxygen concentration sensor and the actuator respectively.

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