PSA feed gas dehydration device

Abstract

The utility model provides a PSA (Pressure Swing Adsorption) feed gas dehydration device, which solves the problems of feed gas dehydration and the like and comprises a freezing heat exchange mechanism, the freezing heat exchange mechanism is connected with a coalescer and is provided with a heat exchanger main body connected with an outlet of a PSA compressor, and the heat exchanger main body is connected with a frozen water transmission assembly. A heat exchange assembly opposite to the chilled water conveying assembly is arranged in the heat exchanger body, and a flow blocking assembly adjacent to the heat exchange assembly is arranged in the heat exchanger body. The dehydration device has the advantages of good dehydration effect, stable structure and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and specifically relates to a PSA raw gas dehydration device. Background Art

[0002] The PSA nitrogen production system uses air as raw material and uses a high-efficiency, highly selective solid adsorbent to selectively adsorb nitrogen and oxygen to separate nitrogen and oxygen in the air. The separation of nitrogen and oxygen by carbon molecular sieve is mainly based on the different diffusion rates of these two gas molecules in the carbon molecular sieve. Gas molecules with smaller diameters diffuse faster and enter the molecular sieve solid phase more. In this way, nitrogen enrichment components can be obtained in the gas phase. In actual operation, the water content entering the PSA device needs to be strictly controlled to prevent a large amount of water from entering the adsorption tower, which will cause the adsorbent performance to deteriorate or even fail.

[0003] In order to solve the shortcomings of the existing technology, people have conducted long-term exploration and proposed a variety of solutions. For example, a Chinese patent document discloses a PSA tail gas recovery device [202010441337.1], which includes a raw gas compressor, a cooler, a drying unit, a cryogenic cold box and a distillation unit. The PSA tail gas is first compressed by the compressor, and the compressed PSA tail gas enters the drying unit for drying and dehydration. The dehydrated PSA tail gas enters the cryogenic cold box for preliminary cooling, and the heavy components after preliminary cooling enter the distillation separation. The distillation separates qualified LPG and C5 products, and the light components after preliminary cooling enter the deep separation to separate > 95% of qualified hydrogen products for use in the hydrogenation unit.

[0004] The above solution solves the problem of hydrogen recovery to a certain extent, but the solution still has many shortcomings, such as the lack of dehydration treatment of the raw gas entering the PSA equipment. Summary of the invention

[0005] The utility model aims to solve the above problems and provide a PSA raw gas dehydration device with reasonable design and good dehydration effect.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions: a PSA raw gas dehydration device, including a refrigeration heat exchange mechanism, which is connected to a condenser, and has a heat exchanger body connected to the outlet of a PSA compressor, the heat exchanger body is connected to a chilled water transmission component, a heat exchange component opposite to the chilled water transmission component is arranged inside the heat exchanger body, and a flow-blocking component adjacent to the heat exchange component is arranged inside the heat exchanger body.

[0007] In the above-mentioned PSA raw gas dehydration device, the heat exchanger body includes a heat exchange tube, the upper end of the heat exchange tube is closed by an air inlet cover, the lower end of the heat exchange tube is closed by a drain seat, the bottom of the drain seat is connected to a drain pipe, the center of the air inlet cover is connected to an air inlet pipe, and the center of the drain seat is connected to an exhaust pipe.

[0008] In the above-mentioned PSA raw gas dehydration device, a manifold is provided at the bottom of the heat exchanger body, a manifold groove is opened on the manifold, and the manifold groove is connected to the drain pipe.

[0009] In the above-mentioned PSA raw gas dehydration device, the interior of the heat exchanger body is divided into an upper cavity and a lower cavity by a partition arranged in the middle, and a partition extending in the vertical direction is arranged on the edge of the partition and the partition is isolated from the side wall of the heat exchange tube. A leakage hole is opened at the upper end of the junction of the partition and the partition, and the air inlet pipe and the exhaust pipe extend toward the partition respectively, and heat exchange channels are left between the air inlet pipe and the exhaust pipe and the partition and the heat exchange tube.

[0010] In the above-mentioned PSA raw gas dehydration device, the chilled water transmission component includes a condenser connected to the heat exchange tube, and the condenser is arranged in a coil relative to the heat exchange channel.

[0011] In the above-mentioned PSA raw gas dehydration device, the heat exchange component includes heat exchange fins which are arranged in the heat exchange channel and are centrally symmetrically arranged, and the condenser tubes pass through each heat exchange fin in sequence.

[0012] In the above-mentioned PSA raw gas dehydration device, the baffle assembly includes baffles arranged inside the heat exchanger body, the baffles are arranged in a stacked manner and connected with spiral support plates, the spiral directions of the upper and lower adjacent support plates are opposite, and the baffles are respectively provided with guide ports corresponding to the gaps between the support plates.

[0013] In the above-mentioned PSA raw gas dehydration device, the baffle assembly is installed in the upper cavity and the lower cavity, and the baffle assembly is located on the inner side of the partition.

[0014] In the above-mentioned PSA raw gas dehydration device, the outer wall of the refrigeration and heat exchange mechanism is coated with a heat insulation layer, and the refrigeration and heat exchange mechanism has a built-in temperature sensor.

[0015] In the above-mentioned PSA raw gas dehydration device, the refrigeration and heat exchange mechanism has a built-in pressure sensor, and a pressure indicator is installed outside the refrigeration and heat exchange mechanism.

[0016] Compared with the existing technology, the advantages of the utility model are: the refrigeration heat exchange mechanism has a built-in baffle component adjacent to the heat exchange component, which reduces the raw material gas flow rate and prolongs its heat exchange time, thereby improving the overall dehydration effect; the heat exchanger body has a built-in cavity with upper and lower partitions, which provides sufficient installation space for the heat exchange component and the baffle component, ensuring the internal heat exchange channel space; the refrigeration heat exchange mechanism is equipped with a temperature sensor and a pressure sensor to monitor the internal state of the heat exchanger body in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the utility model;

[0018] Figure 2 It is a structural sectional view of the utility model;

[0019] Figure 3 It is a partial cross-sectional view of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the flow-blocking component of the utility model;

[0021] In the figure, there are a refrigeration heat exchange mechanism 1, an insulation layer 11, a pressure indicator 12, a heat exchanger body 2, a heat exchange cylinder 21, an air inlet cover 22, a drain seat 23, a drain pipe 24, an air inlet pipe 25, an exhaust pipe 26, a manifold 27, a manifold 28, a chilled water transmission component 3, a condenser 31, a heat exchange component 4, a heat exchange plate 41, a baffle component 5, a baffle 51, a support plate 52, a guide port 53, a partition 6, an upper cavity 61, a lower cavity 62, a partition cylinder 63, a leakage hole 64, and a heat exchange channel 65. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1-4 As shown, a PSA raw gas dehydration device includes a refrigeration heat exchange mechanism 1 connected to a PSA adsorption tower, and the refrigeration heat exchange mechanism 1 is connected to a coalescer to filter out impurities in the raw gas. The refrigeration heat exchange mechanism 1 has a heat exchanger body 2 connected to the outlet of the PSA compressor, and the heat exchanger body 2 is connected to a chilled water transmission component 3, and chilled water is provided from the outside to meet the heat exchange demand. A heat exchange component 4 opposite to the chilled water transmission component 3 is arranged inside the heat exchanger body 2 to further improve the heat exchange efficiency, and a flow blocking component 5 adjacent to the heat exchange component 4 is arranged inside the heat exchanger body 2. When the raw gas flows inside the heat exchanger body 2, the flow blocking component 5 reduces its flow rate to prolong the contact time with the heat exchange component 4.

[0024] Specifically, the heat exchanger body 2 in the present application includes a heat exchange tube 21 made of heat-insulating material, the upper end of the heat exchange tube 21 is closed by an air inlet cover 22, and the lower end of the heat exchange tube 21 is closed by a drain seat 23. The air inlet cover 22 and the drain seat 23 can be disassembled according to actual needs, so as to maintain the internal heat exchange component 4 and the flow-blocking component 5. A drain pipe 24 is connected to the bottom of the drain seat 23, an air inlet pipe 25 is connected to the center of the air inlet cover 22, and an exhaust pipe 26 is connected to the center of the drain seat 23. Each pipeline is externally connected to a raw gas transmission pipe or a recovery pipeline.

[0025] In order to improve the condensate recovery efficiency, a confluence plate 27 is provided at the bottom of the heat exchanger body 2, and a confluence groove 28 is provided on the confluence plate 27, and the confluence groove 28 is connected to the drain pipe 24. The confluence groove 28 guides the condensate into the drain pipe 24, wherein the confluence groove 28 is arranged opposite to the heat exchange component 4.

[0026] Furthermore, unlike the conventional heat exchanger structure, the interior of the heat exchanger body 2 is divided into a relatively independent upper cavity 61 and a lower cavity 62 by a partition 6 arranged in the middle. The edge of the partition 6 is provided with a partition 63 extending in the vertical direction, and the partition 63 is isolated from the side wall of the heat exchange tube 21. A leakage hole 64 is opened at the upper end of the junction between the partition 6 and the partition 63 to ensure the normal discharge of condensed water in the upper cavity 61. The air inlet pipe 25 and the exhaust pipe 26 extend toward the partition 6 respectively, and a heat exchange channel 65 is left between the air inlet pipe 25 and the exhaust pipe 26 and the partition 63 and the heat exchange tube 21. The heat exchange channel 65 between the partition 63 and the heat exchange tube 21 is used for the assembly of the heat exchange channel 65 and the heat exchange component 4.

[0027] Furthermore, similar to the existing condensation structure, the chilled water transmission assembly 3 in the present application includes a condenser tube 31 connected to the heat exchange tube 21, the condenser tube 31 is coiled relative to the heat exchange channel 65, and the inlet and outlet of the condenser tube 31 are respectively connected and fixed to the side wall of the heat exchange tube 21.

[0028] In addition, the heat exchange component 4 includes heat exchange plates 41 disposed in the heat exchange channel 65 and arranged in a centrally symmetrical manner, and the condenser tube 31 passes through each heat exchange plate 41 in sequence, wherein the heat exchange plates 41 can be replaced by fins distributed circumferentially along the condenser tube 31, thereby increasing the overall heat exchange area.

[0029] At the same time, the baffle assembly 5 is filled in the heat exchanger body 2, specifically including baffles 51 arranged inside the heat exchanger body 2, the baffles 51 are vertically stacked and connected with spiral support sheets 52, and spiral gaps are left between adjacent heat exchanger bodies 2. The spiral directions of the upper and lower adjacent support sheets 52 are opposite, and the baffles 51 are respectively provided with guide ports 53 corresponding to the gaps between the support sheets 52. When the raw gas flows between the support sheets 52, its flow velocity is reduced due to the baffles 51.

[0030] It can be seen that the flow-blocking assembly 5 is opposite to the air inlet pipe 25 and the air outlet pipe 26, and is installed in the upper cavity 61 and the lower cavity 62, and the flow-blocking assembly 5 is located inside the partition 63. The raw gas is limited in the air inlet stage and the air outlet stage.

[0031] Obviously, in order to further improve the insulation effect of the heat exchange component 4 and maintain the low temperature inside the heat exchanger body 2, the outer wall of the refrigeration heat exchange mechanism 1 is coated with an insulation layer 11. The refrigeration heat exchange mechanism 1 has a built-in temperature sensor for real-time monitoring, and sends a corresponding alarm signal when the temperature is higher than a predetermined threshold.

[0032] Preferably, the refrigeration heat exchange mechanism 1 has a built-in pressure sensor, and a pressure indicator 12 is installed outside the refrigeration heat exchange mechanism 1. Since the heat exchanger body 2 adopts a closed structure, it is necessary to limit the intake of raw gas, and the pressure indicator 12 releases the pressure when it detects that the pressure is too high.

[0033] To sum up, the principle of this embodiment is that the heat exchanger body 2 in the refrigeration heat exchange mechanism 1 is connected to the chilled water transmission component 3 to continuously provide chilled water, and the heat exchange efficiency is guaranteed by the heat exchange component 4, wherein the baffle component 5 reduces the flow rate of the raw gas in the internal channel of the heat exchanger body 2, thereby ensuring the overall dehydration effect.

[0034] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0035] Although the present invention uses more terms such as refrigeration heat exchange mechanism 1, insulation layer 11, pressure indicator 12, heat exchanger body 2, heat exchange cylinder 21, air inlet cover 22, drain seat 23, drain pipe 24, air inlet pipe 25, exhaust pipe 26, manifold 27, manifold 28, chilled water transmission assembly 3, condenser pipe 31, heat exchange assembly 4, heat exchange plate 41, baffle assembly 5, baffle plate 51, support plate 52, guide port 53, partition 6, upper cavity 61, lower cavity 62, partition 63, liquid leakage hole 64, heat exchange channel 65, etc., it does not exclude the possibility of using other terms. The use of these terms is only for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A PSA feed gas dehydration device, comprising a refrigeration heat exchange mechanism (1), wherein the refrigeration heat exchange mechanism (1) is connected to a coalescer, and is characterized in that: The refrigeration heat exchange mechanism (1) has a heat exchanger body (2) connected to the outlet of the PSA compressor, the heat exchanger body (2) is connected to a chilled water transmission component (3), a heat exchange component (4) opposite to the chilled water transmission component (3) is arranged inside the heat exchanger body (2), and a flow blocking component (5) adjacent to the heat exchange component (4) is arranged inside the heat exchanger body (2).

2. A PSA feed gas dehydration device according to claim 1, characterized in that: The heat exchanger body (2) comprises a heat exchange tube (21), the upper end of the heat exchange tube (21) is closed by an air inlet cover (22), the lower end of the heat exchange tube (21) is closed by a liquid drain seat (23), the bottom of the liquid drain seat (23) is connected to a liquid drain pipe (24), the center of the air inlet cover (22) is connected to an air inlet pipe (25), and the center of the liquid drain seat (23) is connected to an exhaust pipe (26).

3. A PSA feed gas dehydration device according to claim 2, characterized in that: A confluence plate (27) is provided at the bottom of the heat exchanger body (2), a confluence groove (28) is provided on the confluence plate (27), and the confluence groove (28) is connected to the drain pipe (24).

4. A PSA feed gas dehydration device according to claim 2, characterized in that: The interior of the heat exchanger body (2) is divided into an upper cavity (61) and a lower cavity (62) by a partition (6) arranged in the middle. The edge of the partition (6) is provided with a partition (63) extending in the vertical direction, and the partition (63) is isolated from the side wall of the heat exchange tube (21). A leakage hole (64) is opened at the upper end of the junction of the partition (6) and the partition (63). The air inlet pipe (25) and the exhaust pipe (26) extend toward the partition (6) respectively, and a heat exchange channel (65) is left between the air inlet pipe (25) and the exhaust pipe (26) and the partition (63) and the heat exchange tube (21).

5. A PSA feed gas dehydration device according to claim 4, characterized in that: The chilled water transmission component (3) comprises a condenser tube (31) connected to the heat exchange tube (21), and the condenser tube (31) is arranged in a coil relative to the heat exchange channel (65).

6. A PSA feed gas dehydration device according to claim 5, characterized in that: The heat exchange assembly (4) comprises heat exchange fins (41) which are arranged in a centrally symmetrical manner in the heat exchange channel (65), and the condenser tube (31) passes through each heat exchange fin (41) in sequence.

7. A PSA feed gas dehydration device according to claim 4, characterized in that: The baffle assembly (5) comprises baffles (51) arranged inside the heat exchanger body (2); the baffles (51) are arranged in a stacked manner and are connected with spiral support sheets (52); the spiral directions of upper and lower adjacent support sheets (52) are opposite; and the baffles (51) are respectively provided with flow guide ports (53) corresponding to the gaps between the support sheets (52).

8. A PSA feed gas dehydration device according to claim 7, characterized in that: The flow-blocking assembly (5) is installed in the upper cavity (61) and the lower cavity (62), and the flow-blocking assembly (5) is located on the inner side of the partition tube (63).

9. The PSA feed gas dehydration device according to claim 1, characterized in that: The outer wall of the refrigeration heat exchange mechanism (1) is coated with a heat insulation layer (11), and the refrigeration heat exchange mechanism (1) has a built-in temperature sensor.

10. The PSA feed gas dehydration device according to claim 1, characterized in that: The refrigeration heat exchange mechanism (1) has a built-in pressure sensor, and the refrigeration heat exchange mechanism (1) has a pressure indicator (12) installed outside.

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