Energy-saving pressure swing adsorption gas production equipment

Abstract

The utility model belongs to the technical field of pressure swing adsorption equipment, and aims to provide energy-saving pressure swing adsorption gas production equipment which comprises a gas supply unit, an adsorption unit and a gas storage unit which are sequentially connected, the gas supply unit comprises a process air buffer tank, and a clean compressed air inlet is formed in the front end of the process air buffer tank; the adsorption unit comprises a plurality of pressure swing adsorption gas making machines; the gas storage unit comprises a process pure gas buffer tank, the side face of the upper end of the process pure gas buffer tank is connected with the main gas outlet pipeline, the side face of the lower end of the process pure gas buffer tank is provided with a finished gas pipeline, and the tail end of the finished gas pipeline is provided with a finished gas outlet and an unqualified gas discharge outlet. The energy-saving pressure swing adsorption gas production equipment disclosed by the utility model has the characteristics of compact structure, obvious energy-saving effect, high utilization rate of clean compressed gas, low equipment cost, small occupied area and the like, and can be widely applied to the technical field of production of the pressure swing adsorption gas production equipment.

Description

Technical Field

[0001] This utility model belongs to the technical field of pressure swing adsorption equipment, specifically relating to an energy-saving pressure swing adsorption gasification equipment. Background Technology

[0002] Pressure swing adsorption (PSA) gasification equipment is a commonly used industrial air separation device that separates nitrogen, oxygen, or other gases through the working principle of pressurized adsorption and depressurized desorption using adsorbents (such as molecular sieves). With the continuous development of adsorbent technology and intelligent control, PSA gasification equipment has made significant progress in pressure equalization control, gas purity, concentration detection, increased gas production, and equipment operational stability and intelligence. It has gradually become the most effective industrial method for mixed gas separation and gas purification. Compared with cryogenic air separation equipment and membrane separation air separation equipment, it features a simpler process flow, higher automation, faster gas production, lower energy consumption, and higher gas purity. It has wide applications in fields such as steel, chemical, electronics, medical, papermaking, and grain storage.

[0003] Currently, existing energy-saving pressure swing adsorption (PSA) gasification equipment typically achieves energy savings through automatic adjustment of gas consumption. For example, patent application number "202310780111.8" describes a control method for an energy-saving PSA gasification equipment, including a control system, an adsorption unit, a buffer unit, and a gas storage unit. The adsorption unit is equipped with a first valve group controlled by the control system, and the gas storage unit is equipped with a regulating valve controlled by the control system, as well as a flow meter group, a gas purity analyzer, and a pressure gauge connected to the control system. This patent can automatically adjust operating parameters to an energy-saving state based on real-time gas consumption while ensuring that the product gas meets usage requirements. However, although energy savings can be achieved by adjusting gas consumption, for large-volume usage, multiple independent gasification units are still needed to meet the gas demand. Each gasification unit has an air buffer tank at the front end and a pure gas buffer tank at the rear end, which increases cost and land area. Therefore, the structure of existing energy-saving PSA gasification equipment needs further improvement. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an energy-saving pressure swing adsorption (PSA) gasification equipment. By adopting a structure in which one process air buffer tank and one process pure gas buffer tank correspond to multiple PSA gasification main units, and based on the gas volume distribution characteristics of large gas consumption in the early stage and small gas consumption in the later stage, PLC is used to supply gas in time-sharing and segmented manner to realize the cyclic operation of PSA. It has the characteristics of compact structure, significant energy-saving effect, high utilization rate of clean compressed gas, low equipment cost and small footprint, and can be widely used in the field of production technology of PSA gasification equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an energy-saving pressure swing adsorption (PSA) gasification device, comprising a gas supply unit, an adsorption unit, and a gas storage unit connected in sequence. The gas supply unit includes a process air buffer tank, with a clean compressed air inlet at its front end. The adsorption unit includes several PSA generators, each with a branch outlet pipeline at its top. Each branch outlet pipeline has an independent control valve, and the branch outlet pipelines converge to a main outlet pipeline. The gas storage unit includes a process pure gas buffer tank, with its upper side connected to the main outlet pipeline and its lower side having a finished product gas pipeline. The finished product gas pipeline has a finished product gas outlet and a non-conforming gas discharge port at its end.

[0006] As an improvement, the upper side of the process air buffer tank is provided with a main air pipeline, which connects to each branch air pipeline, and the branch air pipelines are respectively connected to the pressure swing adsorption gas generator.

[0007] As an improvement, the air distribution line is equipped with an independently controlled clean compressed air intake valve.

[0008] As an improvement, the pressure swing adsorption gas generator is provided in a total of 3 to 10 units, and adopts a parallel independent connection structure.

[0009] As an improvement, the pressure swing adsorption gas generator includes a first adsorption tower and a second adsorption tower, and is equipped with a PLC control system and a solenoid valve assembly; the first adsorption tower and the second adsorption tower are provided with an inlet pipe at the bottom and an outlet pipe at the top; the rear end of the inlet pipe is connected to a silencer, and the rear end of the outlet pipe is provided with a backflush circuit.

[0010] As an improvement, a medium-pressure equalization pipeline is provided between the first adsorption tower and the second adsorption tower.

[0011] As an improvement, the clean compressed air inlet is a flange structure, which connects to the compressed gas dryer assembly.

[0012] As an improvement, the finished gas pipeline is equipped with a filter, and the downstream end of the filter is equipped with a gas purity analyzer, a pressure monitor and several intelligent control valves.

[0013] As an improvement, the gas purity analyzer, pressure monitor, and intelligent control valve are connected to a PLC control system.

[0014] As an improvement, both the finished gas outlet and the unqualified gas discharge outlet are equipped with flange structures.

[0015] As an improvement, both the process air buffer tank and the process pure gas buffer tank are cylindrical sealed pressure vessels with a safety valve at the top and a drain ball valve at the bottom.

[0016] The beneficial effects of this utility model are as follows: An energy-saving pressure swing adsorption (PSA) gasification device features a compact structure, significant energy-saving effect, high utilization rate of clean compressed gas, low equipment cost, and small footprint. By employing a structure where one process air buffer tank and one process pure gas buffer tank correspond to multiple PSA gasification units, and utilizing the characteristic of high gas consumption in the early stages and low gas consumption in the later stages of the PSA gasification unit, combined with the control valves of the branch pipelines, the PLC system automatically adjusts the staggered interval time, ensuring that the gas supply of a single process air buffer tank meets the needs of multiple PSA gasification units. Due to the staggered air intake, the volumes of the process air buffer tank and process pure gas buffer tank can be set smaller, saving process space. The number and volume of air buffer tanks are important considerations. During operation, each main unit briefly stops supplying gas to the process pure gas buffer tank (when the adsorption tower switches between pressurization and uniform gas recovery), resulting in reduced product gas pressure and flow. However, by employing a multi-main-unit staggered process, this defect is avoided, minimizing gas supply, pressure, temperature, and overall unit pressure loss, thereby reducing production costs and saving floor space. Furthermore, by having multiple pressure swing adsorption (PSA) gas generators corresponding to one process pure gas buffer tank, and using control valves on branch pipelines, gas supply to one or more PSA gas generators can be adjusted according to gas consumption, reducing the operating time of the PSA gas generators. In actual production applications, this has resulted in significant energy savings and consumption reduction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the working process of the energy-saving pressure swing adsorption gasification equipment of this utility model;

[0018] Figure 2 This is a partially enlarged view of the energy-saving pressure swing adsorption gasification equipment of this utility model.

[0019] In the diagram: 1. Gas supply unit, 2. Adsorption unit, 3. Gas storage unit, 11. Process air buffer tank, 12. Clean compressed air inlet, 21. Pressure swing adsorption gas generator, 22. Branch outlet pipeline, 23. Control valve, 24. Main outlet pipeline, 25. Clean compressed air inlet branch valve, 26. Backflush circuit, 211. First adsorption tower, 212. Second adsorption tower, 213. PLC control system, 214. Solenoid valve assembly, 215. Inlet pipeline, 216. Outlet pipeline, 217. Silencer, 218. Medium pressure equalization pipeline, 31. Process pure gas buffer tank, 32. Finished product gas pipeline, 33. Finished product gas outlet, 34. Unqualified gas discharge port, 35. Filter, 36. Gas purity analyzer, 37. Pressure monitor, 38. Intelligent control valve. Detailed Implementation

[0020] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0021] like Figures 1-2 As shown, an energy-saving pressure swing adsorption (PSA) gasification device according to this embodiment includes a gas supply unit 1, an adsorption unit 2, and a gas storage unit 3 connected in sequence. The gas supply unit 1 includes a process air buffer tank 11, with a clean compressed air inlet 12 at the front end of the process air buffer tank 11. The adsorption unit 2 includes several PSA gasifiers 21, each of which has a branch outlet pipe 22 at its top. Each branch outlet pipe 22 has an independent control valve 23, and the branch outlet pipes 22 converge to a main outlet pipe 24. The gas storage unit 3 includes a process pure gas buffer tank 31, with its upper side connected to the main outlet pipe 24 and its lower side having a finished product gas pipe 32. The finished product gas pipe 32 has a finished product gas outlet 33 and a substandard gas discharge port 34 at its end.

[0022] Furthermore, the upper side of the process air buffer tank 11 is provided with a main air pipeline 13, which connects to each branch air pipeline 14, and the branch air pipelines 14 are respectively connected to the pressure swing adsorption gas generator 21. Specifically, each branch air pipeline 14 is provided with an independently controlled clean compressed air inlet valve 25, and the sequential air supply is achieved by opening and closing the clean compressed air inlet valve 25 to meet the air demand of the pressure swing adsorption gas generator 21.

[0023] Furthermore, the pressure swing adsorption gas generator 21 is provided in a total of 3 to 10 units, preferably 4 to 6 units, and adopts a parallel independent connection structure; specifically, the different gas flow requirements of the terminal are met by 4 to 6 units of the pressure swing adsorption gas generator 21, and the PLC control system realizes the staggered gas supply of one or more units according to the actual gas demand. Due to the staggered gas intake, the volume of the process air buffer tank 11 and the process pure gas buffer tank 21 is reduced, and the pressure loss from the air inlet to the air outlet is minimal, achieving a significant energy saving and consumption reduction effect.

[0024] Furthermore, the pressure swing adsorption gas generator 21 includes a first adsorption tower 211 and a second adsorption tower 212, and is equipped with a PLC control system 213 and a solenoid valve assembly 214. Specifically, the PLC control system is located in a PLC control box, which can be one or more units. The staggered interval time is automatically adjusted according to the number of units operating in the main unit. The first adsorption tower 211 and the second adsorption tower 212 are provided with an inlet pipe 215 at the bottom and an outlet pipe 216 at the top. The rear end of the inlet pipe 215 is connected to a silencer 217, and the rear end of the outlet pipe 216 is provided with a backflush circuit 26. Specifically, a medium pressure equalization pipe 218 is provided between the first adsorption tower 211 and the second adsorption tower 212 to improve the working efficiency of adsorption and desorption.

[0025] Furthermore, the clean compressed air inlet 12 has a flange structure and is connected to the compressed gas dryer assembly via the flange. Specifically, the clean compressed air inlet 12 with the flange structure can be quickly connected to the front-end compressed gas dryer assembly, and the compressed gas dryer assembly can be an adsorption dryer or a refrigerated dryer, or a combination of adsorption and refrigeration dryer.

[0026] Furthermore, a filter 35 is provided on the finished gas pipeline 32, and a gas purity analyzer 36, a pressure monitor 37 and several intelligent control valves 38 are provided at the rear end of the filter 35; specifically, the gas purity analyzer 36, the pressure monitor 37 and the intelligent control valves 38 are connected to a PLC control system, and the automatic control of the finished gas flow rate and pressure is realized through the PLC control system.

[0027] Furthermore, both the finished gas outlet 33 and the unqualified gas discharge outlet 34 are equipped with flange structures; specifically, the finished gas outlet 33 with flange structure facilitates quick connection to the terminal gas pipeline, and the unqualified gas discharge outlet 34 with flange structure facilitates quick connection to the exhaust pipeline.

[0028] Furthermore, both the process air buffer tank 11 and the process pure gas buffer tank 31 are cylindrical sealed pressure vessels with a safety valve at the top and a drain ball valve at the bottom. Specifically, both the process air buffer tank 11 and the process pure gas buffer tank 31 are made of high-strength stainless steel, and the rated internal pressure of the tank is ≤1.2MPa, preferably 0.8~1.0MPa.

[0029] Finally, it should be noted that the above examples are merely specific embodiments of this utility model. Obviously, this utility model is not limited to the above embodiments and can have many variations. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of this utility model should be considered within the protection scope of this utility model.

Claims

1. An energy-saving pressure swing adsorption (PSA) gasification device, characterized in that, The system includes a gas supply unit (1), an adsorption unit (2), and a gas storage unit (3) connected in sequence. The gas supply unit (1) includes a process air buffer tank (11), and the process air buffer tank (11) is provided with a clean compressed air inlet (12) at the front end. The adsorption unit (2) includes several pressure swing adsorption gas generators (21), and each pressure swing adsorption gas generator (21) is provided with a branch gas outlet pipeline (22) at the top. The branch gas outlet pipeline (22) is provided with an independent control valve (23), and the branch gas outlet pipeline (22) is connected to the main gas outlet pipeline (24). The gas storage unit (3) includes a process pure gas buffer tank (31), the upper side of which is connected to the main gas outlet pipeline (24), and the lower side is provided with a finished gas pipeline (32). The finished gas pipeline (32) is provided with a finished gas outlet (33) and a non-conforming gas discharge port (34) at the end.

2. The energy-saving pressure swing adsorption gasification equipment according to claim 1, characterized in that, The process air buffer tank (11) has a main air pipeline (13) on its upper side. The main air pipeline (13) is connected to each branch air pipeline (14), and the branch air pipelines (14) are respectively connected to the pressure swing adsorption gas generator (21).

3. The energy-saving pressure swing adsorption gasification equipment according to claim 2, characterized in that, The air distribution pipeline (14) is equipped with an independently controlled clean compressed air intake valve (25).

4. The energy-saving pressure swing adsorption gasification equipment according to claim 2, characterized in that, The pressure swing adsorption gas generator (21) is provided in a total of 3 to 10 units, and adopts a parallel independent connection structure.

5. The energy-saving pressure swing adsorption gasification equipment according to claim 2 or 4, characterized in that, The pressure swing adsorption gas generator (21) includes a first adsorption tower (211) and a second adsorption tower (212), and is equipped with a PLC control system (213) and a solenoid valve assembly (214) inside; the first adsorption tower (211) and the second adsorption tower (212) are provided with an inlet pipe (215) at the bottom and an outlet pipe (216) at the top; the rear end of the inlet pipe (215) is connected to a silencer (217), and the rear end of the outlet pipe (216) is provided with a backflush circuit (26).

6. The energy-saving pressure swing adsorption gasification equipment according to claim 5, characterized in that, A medium pressure equalization pipeline (218) is provided between the first adsorption tower (211) and the second adsorption tower (212).

7. The energy-saving pressure swing adsorption gasification equipment according to claim 1, characterized in that, The clean compressed air inlet (12) is a flange structure, and the compressed gas dryer assembly is connected through the flange.

8. The energy-saving pressure swing adsorption gasification equipment according to claim 1, characterized in that, The finished gas pipeline (32) is equipped with a filter (35), and the rear end of the filter (35) is equipped with a gas purity analyzer (36), a pressure monitor (37) and several intelligent control valves (38).

9. The energy-saving pressure swing adsorption gasification equipment according to claim 8, characterized in that, The gas purity analyzer (36), pressure monitor (37), and intelligent control valve (38) are connected to the PLC control system.

10. The energy-saving pressure swing adsorption gasification equipment according to claim 1, characterized in that, Both the process air buffer tank (11) and the process pure gas buffer tank (31) are cylindrical sealed pressure vessels with a safety valve at the top and a drain ball valve at the bottom.

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