A vacuum pressure swing adsorber for VPSA oxygen generator

Abstract

A vacuum pressure swing adsorber for a VPSA oxygen generator comprises an adsorption tower, which is connected to an air buffer tank and a vacuum pump. A nitrogen and oxygen screening layer is arranged in the adsorption tower, and an upper port and a lower port are arranged on both sides of the nitrogen and oxygen screening layer, respectively. An airflow diffuser is also arranged in the adsorption tower, and the airflow diffuser comprises a plurality of splitter plates arranged at intervals, and flow holes are provided on the splitter plates of the layers, and the flow holes on two adjacent splitter plates are arranged in a staggered manner, and the edges of the splitter plates are distributed in a normal curve along the radial direction of the adsorption tower; the airflow diffuser adjusts the airflow at the air inlet in a normal distribution manner, and the gas is diverted to the side around the feed port due to the large number of splitter plates at the air inlet end and the large resistance of the flow holes, and the airflow resistance and the number of layers of the gas passing through the splitter plates are gradually reduced along the radial direction of the adsorption tower, and the splitter plates arranged in a normal distribution are used to evenly distribute the airflow at the air inlet end in the adsorption tower, thereby improving the adsorption and desorption efficiency and effect of the nitrogen and oxygen screening layer.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessel packing towers, and in particular to a vacuum pressure swing adsorber for a VPSA oxygen generator. Background Art

[0002] PSA nitrogen generators, oxygen generators and other air separation equipment widely use adsorbents such as activated alumina, molecular sieves, carbon molecular sieves, activated carbon, etc. as the main process media. In order to make full use of the packing in the pressure vessel packed tower, the airflow needs to pass through the packing evenly. Due to the restrictions of the inlet and outlet pipes, the airflow often passes through the packing in the container in a convergent state, so a considerable part of the packing cannot be fully utilized. There is room for improvement in the existing technology. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a vacuum pressure swing adsorber for a VPSA oxygen generator, in which an airflow diffuser is arranged in the adsorption tower to achieve uniform distribution of the airflow in the adsorption tower, thereby increasing the contact area between the gas flow and the nitrogen and oxygen screening layer, and improving the adsorption and desorption efficiency and effect of the nitrogen and oxygen screening layer.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a vacuum pressure swing adsorber for a VPSA oxygen generator, comprising an adsorption tower, the adsorption tower is connected to an air buffer tank and a vacuum pump, a nitrogen and oxygen screening layer is arranged in the adsorption tower, an upper port and a lower port are arranged on both sides of the nitrogen and oxygen screening layer, an air flow diffuser is also arranged in the adsorption tower, the air flow diffuser comprises a plurality of layers of splitter plates arranged at intervals, the layered splitter plates are provided with flow holes, the flow holes on two adjacent splitter plates are arranged in a staggered manner, and the edges of the splitter plates are distributed in a normal curve along the radial direction of the adsorption tower.

[0005] By adopting the above technical scheme, the air flow diffuser adopts a normal distribution method to adjust the airflow at the air inlet, and the gas is diverted to the side around the feed port due to the large number of diverter plates at the air inlet end and the large resistance of the flow holes. The air flow resistance and the number of layers of the gas passing through the diverter plates are gradually reduced along the radial direction of the adsorption tower, so that the gas diffuses radially along the adsorption tower. The diverter plates arranged in a normal distribution are used to evenly distribute the airflow at the air inlet end in the adsorption tower, thereby increasing the contact area between the gas flow and the nitrogen and oxygen screening layer, and improving the adsorption and desorption efficiency and effect of the nitrogen and oxygen screening layer.

[0006] The present invention is further configured such that two ends of the adsorption tower are configured in a hemispherical structure.

[0007] By adopting the above technical solution, the two ends of the adsorption tower are hemispherical structures, and the airflow diffuser can be arranged in the hemispherical structure at the end of the adsorption tower, providing more accommodation space for the nitrogen and oxygen screening layer.

[0008] The present invention is further configured to include an upper flow collector, which includes a gas collecting end located above the nitrogen and oxygen screening layer and a connecting end connected to the upper port, and the gas collecting end is configured to have a constricted opening on one side to the connecting end.

[0009] By adopting the above technical solution, the upper confluence device of the constricted structure can guide the airflow into the upper port.

[0010] The present invention is further configured as follows: the diverter plate with the smallest area is arranged at the lower port, and the diverter plate with the largest area is connected to the nitrogen and oxygen screening layer.

[0011] By adopting the above technical solution, the gas passes through the flow holes on the diverter plate layer by layer from the side of the diverter plate with the smallest area. The number of diverter plates above the diverter plate with the smallest area is the largest, so the air flow resistance at this diverter plate is the largest, forcing the airflow to flow radially along the adsorption tower. As the number of diverter plate layers decreases and the radial flow distance increases, the airflow is evenly distributed in the radial direction of the adsorption tower.

[0012] The present invention is further configured as follows: a center hole located at the center of the lower port is opened on the diverter plate, and the diameters of the center holes on adjacent diverter plates are reduced layer by layer.

[0013] By adopting the above technical solution, the central hole is gradually reduced layer by layer to increase the resistance at the central hole, increase the amount of gas flowing radially along the adsorption tower, and further optimize the airflow.

[0014] The present invention is further configured as follows: a 13X molecular sieve layer is filled between adjacent diverter plates.

[0015] By adopting the above technical solution, the 13X molecular sieve layer is filled between the diverter plates, and the gaps between the diverter plates are used to dry the gas and adsorb carbon dioxide, providing a larger space for the nitrogen and oxygen screening layer.

[0016] The present invention is further configured as follows: the diverter plate with the largest area is arranged at the lower port, and the nitrogen and oxygen screening layers are filled between adjacent diverter plates.

[0017] By adopting the above technical solution, the diverter plate with the largest area can guide the airflow to flow along the screening tower. As the number of diverter plates decreases and the radial flow distance increases, the airflow is evenly distributed in the radial direction of the adsorption tower. Filling nitrogen and oxygen screening layers between the diverter plates can increase the volume of the nitrogen and oxygen screening layers in the adsorption tower and increase the separation amount of nitrogen and oxygen.

[0018] The present invention is further configured as follows: a 13X molecular sieve layer is provided between the diverter plate and the lower port.

[0019] By adopting the above technical solution, the 13X molecular sieve layer is filled between the diverter plates, and the gaps between the diverter plates are used to dry the gas and adsorb carbon dioxide, providing more space for the nitrogen and oxygen sieving layer.

[0020] The present invention is further configured such that: the number of the diverter plates in the airflow diffuser is 5 to 12.

[0021] By adopting the above technical solution, it is ensured that the air diffuser generates sufficient resistance to divert the gas.

[0022] The present invention is further configured such that the interval between adjacent diverter plates is between 5 and 10 mm.

[0023] By adopting the above technical solution, the space occupied in the axial direction of the adsorption tower can be minimized under the premise of reducing the diffusion capacity of the air flow diffuser.

[0024] In summary, the present invention has the following effects:

[0025] 1. The gas is diverted to the side of the feed port by the large number of diverter plates at the gas inlet end and the resistance of the flow holes is large. The air flow resistance and the number of layers of the gas passing through the diverter plates are gradually reduced along the radial direction of the adsorption tower, so that the gas can diffuse radially along the adsorption tower;

[0026] 2. The normally distributed splitter plate is used to evenly distribute the airflow at the inlet end in the adsorption tower, thereby increasing the contact area between the gas flow and the nitrogen and oxygen screening layer, and improving the adsorption and desorption efficiency and effect of the nitrogen and oxygen screening layer;

[0027] 3. The gradual reduction of the central hole increases the resistance at the central hole, increases the amount of gas flowing radially along the adsorption tower, and further optimizes the airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0029] Figure 1 It is the overall structural schematic diagram of the adsorption tower;

[0030] Figure 2 Schematic diagram of the internal structure of the adsorption tower in Example 1;

[0031] Figure 3 is a schematic diagram of the end surface structure of the airflow diffuser in Example 1;

[0032] Figure 4 Schematic diagram of the internal structure of the adsorption tower in Example 2.

[0033] In the figure: 1, adsorption tower; 11, upper port; 12, lower port; 2, air buffer tank; 3, vacuum pump; 4, nitrogen and oxygen screening layer; 5, air flow diffuser; 51, diverter plate; 52, flow hole; 6, center hole; 7, upper layer confluence; 71, connecting end; 72, gas collecting end; 8, normal curve; 9, 13X molecular sieve layer. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0035] Embodiment 1:

[0036] like Figure 1 As shown, a vacuum pressure swing adsorber for a VPSA oxygen generator includes an adsorption tower 1, and the adsorption tower 1 is connected to an air buffer tank 2 and a vacuum pump 3.

[0037] Combination Figure 2 As shown, a nitrogen oxygen screening layer 4 is arranged in the adsorption tower 1, and an upper port 11 and a lower port 12 are respectively arranged on both sides of the nitrogen oxygen screening layer 4, and the two ends of the adsorption tower 1 are arranged in a hemispherical structure.

[0038] An airflow diffuser 5 is arranged at the lower port 12 of the adsorption tower 1, and the airflow diffuser 5 includes multiple layers of splitter plates 51 arranged at intervals, and the layered splitter plates 51 are each provided with flow holes 52, and the flow holes 52 on two adjacent splitter plates 51 are staggered, and the splitter plates 51 in the airflow diffuser 5 are arranged in 5-12 layers; the interval between adjacent splitter plates 51 is between 5-10mm, and the edges of the splitter plates 51 are distributed in a normal curve 8 along the radial direction of the adsorption tower 1.

[0039] The upper port 11 of the adsorption tower 1 includes an upper flow collector 7, which includes a gas collecting end 72 located above the nitrogen and oxygen screening layer 4 and a connecting end 71 connected to the upper port 11, and the gas collecting end 72 is narrowed to one side of the connecting end 71.

[0040] Combination Figure 3 As shown, the diverter plate 51 with the smallest area in this scheme is arranged at the lower port 12, and the diverter plate 51 with the largest area is connected to the nitrogen and oxygen screening layer 4. The diverter plate 51 is provided with a center hole 6 located at the center of the lower port 12, and the diameters of the center holes 6 on adjacent diverter plates 51 are reduced layer by layer, and 13X molecular sieve layers 9 are filled between adjacent diverter plates 51.

[0041] Embodiment 2:

[0042] like Figure 4As shown, the difference between Example 2 and Example 1 is that the diverter plate 51 with the largest area is arranged at the lower port 12, the nitrogen and oxygen sieve layers 4 are filled between adjacent diverter plates 51, and a 13X molecular sieve layer 9 is arranged between the diverter plate 51 and the lower port 12.

[0043] It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A vacuum pressure swing adsorber for a VPSA oxygen generator, comprising an adsorption tower (1), wherein the adsorption tower (1) is connected to an air buffer tank (2) and a vacuum pump (3), wherein a nitrogen and oxygen screening layer (4) is arranged in the adsorption tower (1), and an upper port (11) and a lower port (12) are respectively arranged on both sides of the nitrogen and oxygen screening layer (4), wherein: The adsorption tower (1) is further provided with an air diffuser (5), the air diffuser (5) comprising a plurality of flow dividers (51) arranged at intervals, each of the layered flow dividers (51) being provided with a flow hole (52), the flow holes (52) on two adjacent flow dividers (51) being arranged in a staggered manner, and the edges of the flow dividers (51) being distributed in a normal curve (8) along the radial direction of the adsorption tower (1); the flow divider (51) with the smallest area is arranged at the lower port (12), and the flow divider (51) with the largest area is connected to the nitrogen and oxygen screening layer (4); the flow divider (51) is provided with a central hole (6) located at the center of the lower port (12), and the diameters of the central holes (6) on adjacent flow dividers (51) are reduced layer by layer.

2. A vacuum pressure swing adsorber for a VPSA oxygen generator according to claim 1, characterized in that: The two ends of the adsorption tower (1) are arranged in a hemispherical structure.

3. A vacuum pressure swing adsorber for a VPSA oxygen generator according to claim 1, characterized in that: It also includes an upper flow collector (7), the upper flow collector (7) including a gas collecting end (72) located above the nitrogen and oxygen screening layer (4) and a connecting end (71) connected to the upper port (11), and a side from the gas collecting end (72) to the connecting end (71) is configured in a constricted manner.

4. A vacuum pressure swing adsorber for a VPSA oxygen generator according to claim 3, characterized in that: A 13X molecular sieve layer (9) is filled between adjacent diversion plates (51).

5. A vacuum pressure swing adsorber for a VPSA oxygen generator according to any one of claims 1 to 3, characterized in that: The flow divider plate (51) with the largest area is arranged at the lower port (12), and the nitrogen and oxygen screening layers (4) are filled between adjacent flow divider plates (51).

6. A vacuum pressure swing adsorber for a VPSA oxygen generator according to claim 5, characterized in that: A 13X molecular sieve layer (9) is provided between the diverter plate (51) and the lower port (12).

7. A vacuum pressure swing adsorber for a VPSA oxygen generator according to claim 1, characterized in that: The flow divider plates (51) in the airflow diffuser (5) are provided with 5 to 12 layers.

8. A vacuum pressure swing adsorber for a VPSA oxygen generator according to claim 1, characterized in that: The interval between adjacent diverter plates (51) is between 5 and 10 mm.

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