Adsorption tower and adsorption system for drying gas

Abstract

The invention belongs to the technical field of adsorption towers, and discloses an adsorption tower for gas drying and a gas drying adsorption system.The adsorption tower comprises a tower body and a heat exchanger and is used for enabling gas to be dried and regeneration cycle gas to circulate in the tower body, an adsorbent is used for drying the gas to be dried, and the regeneration cycle gas is used for cyclic regeneration of the adsorbent; the heat exchanger comprises a heat exchange tube and a partition plate, and the heat exchange tube extends in the length direction of the tower body; the heat exchange pipes are sleeved with the partition plates, and the partition plates are arranged in the length direction of the tower body at intervals and can divide the interior of the tower body into a plurality of communicated cavities. The gas drying adsorption system comprises a heat exchange loop and a drying regeneration loop, and further comprises at least one adsorption tower for gas drying. According to the invention, the temperature rise problem of the adsorption tower in the adsorption process and the technical problem of rapid dehydration and cooling in the regeneration process are solved, the structural design is ingenious, high drying and regeneration efficiency can be ensured, and the design complexity of the system is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of adsorption towers, and in particular to an adsorption tower and an adsorption system for gas drying. Background Art

[0002] In the field of gas adsorption drying, the main drying role in the currently widely used closed-cycle gas adsorption drying equipment is played by the adsorption tower, which is filled with a large number of adsorbent particles, the main components of which are molecular sieves or alumina.

[0003] In the process of absorbing water and drying, the adsorbent will release a lot of heat due to the liquefaction of water vapor. At the same time, part of the water will react with the adsorbent to hydrate, which will also release a lot of heat. This heat will cause the temperature in the adsorption tower to rise, greatly reducing the adsorption efficiency and prolonging the drying time. When the adsorption tower reaches saturation, the equipment will complete the function switch of the adsorption tower and regenerate the adsorbent in the saturated adsorption tower. The regeneration is mainly divided into two processes: heating dehydration and cold blowing. The heating dehydration is to reversely blow the high-temperature dry gas medium (130-150℃) into the adsorption tower to be regenerated, and the water in it is taken out by increasing the temperature of the adsorbent particles. After the regeneration of the adsorption tower is completed, due to the high temperature of the adsorbent particles and the extremely poor water absorption capacity, it cannot be switched to the adsorption state immediately, and it is necessary to cool it down by cold blowing, that is, blowing the lower temperature dry gas medium into the adsorption tower to take out the heat in it to achieve the cooling effect.

[0004] In the past, during the regeneration of the adsorption tower, additional equipment such as heaters and coolers to control the gas temperature was required, which increased the complexity of the system. In addition, the processes of adsorbent dehydration and cold blowing consumed a large amount of dry gas medium, which reduced the drying efficiency of the equipment. At present, there are also some technical solutions in the prior art that heat exchangers are set in the adsorption tower to heat the adsorption material of the adsorption tower. However, since the heat exchanger pipeline is separated from the adsorption gas path in the adsorption tower, the heat exchanger is not fully utilized, and the overall heat exchange efficiency is relatively low. Summary of the invention

[0005] The purpose of the present invention is to simultaneously solve the problem of temperature rise in the adsorption process of the adsorption drying equipment and the technical problem of rapid dehydration and cooling in the regeneration process, and the ingenious structural design can ensure high drying and regeneration efficiency.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] An adsorption tower for gas drying comprises: a tower body, wherein the tower body is filled with an adsorbent, and gas inlets and outlets are respectively arranged at both ends of the tower body, and are used to allow the gas to be dried and the regenerated circulating gas to circulate in the tower body, wherein the adsorbent is used to dry the gas to be dried, and the regenerated circulating gas is used for the cyclic regeneration of the adsorbent; a heat exchanger, which is arranged inside the tower body along the length direction of the tower body and is used to exchange heat with the adsorbent and the gas entering the tower body, wherein the heat exchanger comprises a heat exchange tube and a partition, wherein the heat exchange tube is extended along the length direction of the tower body, and media of different temperatures can be passed into the heat exchange tube; the partition is sleeved outside the heat exchange tube and is arranged at intervals along the length direction of the tower body, and can divide the interior of the tower body into a plurality of interconnected cavities.

[0008] Preferably, the tower body comprises a first tower body and a second tower body, and the first tower body and the second tower body are detachably and hermetically connected.

[0009] Preferably, a plurality of heat exchange tubes are provided, the plurality of heat exchange tubes penetrate into and out of the same end of the tower body and extend along the length direction of the tower body, and the plurality of heat exchange tubes are evenly and spaced apart.

[0010] Preferably, the heat exchange tube comprises a plurality of heat exchange sub-tubes connected end to end in sequence, and each heat exchange sub-tube is extended along the length direction of the tower body.

[0011] Preferably, the edge of the partition is in contact with the inner wall of the tower body, and a communication port is provided along one side perpendicular to the axial direction of the tower body.

[0012] Preferably, along a direction perpendicular to the axial direction of the tower body, the communicating openings of two adjacent partitions are respectively arranged on two sides of the tower body.

[0013] Preferably, the partitions are arranged at an angle, and the angle between the partitions and the plane perpendicular to the axial direction of the tower body is in the range of 5°-15°, and two adjacent partitions are arranged at an angle.

[0014] Another object of the present invention is to provide a gas drying adsorption system that can quickly and conveniently switch the heat exchange medium of the heat exchanger in the adsorption tower, while simplifying the adsorption system and ensuring that the working efficiency of the adsorption tower is always high.

[0015] To achieve this object, the present invention adopts the following technical solutions:

[0016] The gas drying adsorption system comprises a heat exchange circuit and a drying regeneration circuit, and also comprises at least one of the above-mentioned gas drying adsorption towers; the heat exchange circuit is connected to the heat exchanger of the adsorption tower, and is used for heat exchange with the adsorbent in the adsorption tower and the gas entering the tower body; the drying regeneration circuit is connected to the air inlet and outlet at both ends of the adsorption tower, and is used for drying the gas and regenerating the adsorbent.

[0017] Preferably, the heat exchange circuit includes a cold source and a heat source, and the cold source and the heat source are connected to the heat exchanger of the adsorption tower through a first control valve assembly and a second control valve assembly; the first control valve assembly is arranged between the medium inlet of the heat exchanger and the refrigerant outlet of the cold source and the heat medium outlet of the heat source, and the second control valve assembly is arranged between the medium outlet of the heat exchanger and the reflux port of the refrigerant of the cold source and the reflux port of the heat medium of the heat source.

[0018] Preferably, the drying regeneration circuit comprises a dryer and a gas storage device, the gas inlet and outlet at one end of the adsorption tower is connected to the dryer, and the gas inlet and outlet at the other end of the adsorption tower is connected to the gas storage device.

[0019] Beneficial effects of the present invention:

[0020] The gas drying adsorption tower provided by the present invention comprises a tower body and a heat exchanger, wherein the tower body is filled with an adsorbent, and gas inlets and outlets are respectively arranged at both ends of the tower body, and are used to allow the gas to be dried and the regenerated circulating gas to circulate in the tower body, the adsorbent is used to dry the gas to be dried, and the regenerated circulating gas is used for the cyclic regeneration of the adsorbent; the heat exchanger is arranged inside the tower body along the length direction of the tower body and is used to exchange heat with the adsorbent and the gas entering the tower body, the heat exchanger comprises a heat exchange tube and a partition, the heat exchange tube is extended along the length direction of the tower body, and media of different temperatures can be passed into the heat exchange tube; the partition is sleeved outside the heat exchange tube and arranged at intervals along the length direction of the tower body, and the interior of the tower body can be divided into a plurality of interconnected cavities. The heat exchanger in the adsorption tower of the present invention can not only exchange heat with the adsorbent in the tower to control the temperature in the tower, but also fully exchange heat with the gas entering the tower through the ingenious arrangement of the partition, without the need to heat up or cool down the gas in advance, thereby simplifying the structure, and can fully utilize the heat exchanger, and improve the heat exchange efficiency of the heat exchanger. The gas drying adsorption system provided by the present invention includes a heat exchange circuit and a drying regeneration circuit, and also includes at least one gas drying adsorption tower as described above; the heat exchange circuit is connected to the heat exchanger of the adsorption tower, and is used for heat exchange with the adsorbent in the adsorption tower and the gas entering the tower body; the drying regeneration circuit is connected to the air inlet and outlet at both ends of the adsorption tower, and is used for drying the gas and regenerating the adsorbent. The system can quickly and conveniently switch the heat exchange medium of the heat exchanger in the adsorption tower, and can simplify the adsorption system while ensuring that the working efficiency of the adsorption tower is always high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an adsorption tower for gas drying in one embodiment of the present invention;

[0022] Figure 2 1 is a schematic diagram of the structure of a gas drying adsorption tower in one embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of a heat exchanger in one embodiment of the present invention;

[0024] Figure 4 yes Figure 1 Schematic diagram of the cross section at AA;

[0025] Figure 5 yes Figure 1 Schematic diagram of the cross section at BB;

[0026] Figure 6 is a schematic diagram of a heat exchange circuit in one embodiment of the present invention;

[0027] Figure 7 is a schematic diagram of a working position of a first control valve assembly in one embodiment of the present invention;

[0028] Figure 8 is a schematic diagram of a working position of a second control valve assembly in one embodiment of the present invention;

[0029] Fig. 9 Schematic diagram of the gas adsorption system in one embodiment of the present invention.

[0030] In the figure:

[0031] 1. Tower body; 11. Air inlet and outlet; 12. First tower body; 121. Feeding port; 13. Second tower body; 131. Discharging port;

[0032] 2. heat exchanger; 21. heat exchange tube; 211. cluster tube; 22. partition; 221. communication port;

[0033] 3. First control valve assembly; 31. First inflow station; 32. Second inflow station; 33. Third inflow station;

[0034] 4. Second control valve assembly; 41. First reflow station; 42. Second reflow station; 43. Third reflow station;

[0035] 51. First air inlet valve; 52. First air return valve;

[0036] 61. Second air inlet valve; 62. Second air return valve;

[0037] 7. Cold source; 8. Heat source; 9. Condensing device; 10. Control unit. DETAILED DESCRIPTION

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0039] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0042] The present invention discloses an adsorption tower for gas drying, such as Figure 1As shown, the adsorption tower includes a tower body 1 and a heat exchanger 2. The tower body 1 is filled with an adsorbent. Inlet and outlet ports 11 are respectively provided at both ends of the tower body 1, and are used to allow the gas to be dried and the regenerated circulating gas to circulate in the tower body 1. The adsorbent is used to dry the gas to be dried, and the regenerated circulating gas is used for the cyclic regeneration of the adsorbent. The heat exchanger 2 is arranged inside the tower body 1 along the length direction of the tower body 1 and is used to exchange heat with the adsorbent and the gas entering the tower body 1. The heat exchanger 2 includes a heat exchange tube 21 and a partition 22. The heat exchange tube 21 is extended along the length direction of the tower body 1, and media of different temperatures can be passed into the heat exchange tube 21. The partition 22 is sleeved on the outside of the heat exchange tube 21 and is arranged at intervals along the length direction of the tower body 1, so as to divide the interior of the tower body 1 into a plurality of interconnected cavities. It can be understood that by dividing the tower body 1 into multiple interconnected cavities through the partition 22, the internal space of the tower body 1 can be fully utilized to extend the gas flow path, so that the heat exchanger 2 can not only exchange heat with the adsorbent, but also fully exchange heat with the gas entering the tower body 1. There is no need to set up additional cooling or heating devices to cool or heat the gas separately, which simplifies the structure of the adsorption tower and improves the operating efficiency of the adsorption tower.

[0043] In some embodiments, Figure 2 As shown, the tower body 1 includes a first tower body 12 and a second tower body 13, and the first tower body 12 and the second tower body 13 are detachable and sealed. It can be understood that the tower body 1 is configured as two parts to facilitate the installation and maintenance of the heat exchanger 2. In some specific embodiments, the first tower body 12 is arranged at the upper end of the second tower body 13, and the first tower body 12 and the second tower body 13 are fixed and sealed by a mounting flange. At the same time, the first tower body 12 is provided with a feed port 121, and the second tower body 13 is provided with a discharge port 131, which is convenient for the loading and replacement of the adsorbent. In other embodiments, the tower body 1 can also be configured as three parts, and the two ends and the middle part are detachable and sealed. The tower body 1 composition of different sections can be set according to actual needs, and no specific restrictions are made here.

[0044] In some embodiments, Figure 1 and Figure 3 As shown, a plurality of heat exchange tubes 21 are provided, and the plurality of heat exchange tubes 21 penetrate into and out of the same end of the tower body 1 and extend along the length direction of the tower body 1. The plurality of heat exchange tubes 21 are evenly and spaced apart and can be arranged in bundles, rows, and other combinations, so that the adsorbent particles are evenly distributed between the heat exchange tubes 21, the contact area with the heat exchange tubes 21 is increased, and the heat exchange efficiency is improved. In some specific embodiments, the heat exchanger 2 penetrates the first tower body 12 into the interior of the tower body 1 and then penetrates the first tower body 12 from the interior of the tower body 1 and out, the heat exchanger 2 is installed inside the adsorption tower, and the heat exchanger 2 is sealed and connected to the first tower body 12 of the adsorption tower to ensure that the circulating medium to be dried and the heat exchange circulating medium do not leak and do not contaminate each other.

[0045] In some embodiments, the heat exchange tube 21 includes a plurality of heat exchange sub-tubes connected end to end in sequence, and each heat exchange sub-tube is extended along the length direction of the tower body 1. It is understandable that the heat exchange tube 21 can be formed by heat exchange sub-tubes of different shapes or connection directions, and the inlet and outlet of the heat exchange tube 21 can be set to the same end in a U-shaped, W-shaped or other form; in some specific embodiments, the heat exchange tube 21 is set to be U-shaped, and the inlets and outlets of all U-shaped tubes are respectively collected on the left and right sides of the first tower body 12, and appropriate gaps are maintained between the multiple U-shaped tubes, so that the adsorbent particles are evenly distributed between the U-shaped heat exchange tubes 21, the contact area with the heat exchange tubes 21 is increased, and the heat exchange efficiency is improved.

[0046] like Figure 3 As shown, in order to facilitate the sealing between the multiple heat exchange tubes 21 and the tower body 1, cluster tubes 211 are respectively provided at both ends of the heat exchange tubes 21, and the ends of the multiple heat exchange tubes 21 are connected to the cluster tubes 21, and pass into and out of the tower body 1 through the cluster tubes 21, and then the cluster tubes 211 and the tower body 1 are sealed and connected to ensure that the circulating medium to be dried and the heat exchange circulating medium do not leak and will not contaminate each other.

[0047] In some embodiments, Figure 1 As shown, the edge of the partition 22 is fitted with the inner wall of the tower body 1, and a connecting port 221 is provided along one side of the direction perpendicular to the axial direction of the tower body 1. Taking the tower body 1 as a cylinder as an example, that is, a connecting port 221 is provided along one side of the radial direction of the tower body 1. It can be understood that the partition 22 can not only divide the interior of the tower body 1 into a plurality of connected cavities, but also support the heat exchange tube 21, maintain the position of the heat exchange tube 21 inside the tower body 1, and at the same time, when filling the adsorbent, the adsorbent particles are distributed more evenly, the contact area between the heat exchange tube 21 and the adsorbent is increased, and the heat exchange efficiency is increased. In some specific embodiments, the connecting port 221 can be formed by cutting one side of the partition 22 to leave a channel for gas circulation, thereby simplifying the structure of the partition 22.

[0048] In some embodiments, Figure 4 and Figure 5As shown, along the direction perpendicular to the axial direction of the tower body 1, the connecting openings 221 of two adjacent partitions 22 are respectively arranged on both sides of the tower body 1. Taking the tower body as a cylinder as an example, that is, the connecting openings 221 of two adjacent partitions 22 are respectively arranged on both sides of the radial direction of the tower body 1. It can be understood that the connecting openings 221 on the two adjacent partitions 22 are respectively arranged on both sides away from each other, so that the gas path in the tower body 1 can be S-shaped. On the one hand, the path of the gas in the tower body 1 is extended, so that the gas can fully contact with the adsorbent to achieve the purpose of gas drying or self-regeneration of the adsorbent. On the other hand, combined with the structural setting of the connecting opening 221 of the partition 22 and the heat exchange tube 21 of the heat exchanger 2, no matter which end of the tower body 1 the gas enters, it can maintain convection with the heat exchange tube 21 on at least one side, thereby improving the heat exchange efficiency between the gas and the heat exchange tube 21.

[0049] In order to ensure smooth filling of the adsorbent, the partition 22 is tilted, and the angle with the plane perpendicular to the axial direction of the tower body 1 is in the range of 5°-15°. Two adjacent partitions 22 are set at an angle. In some embodiments, the tower body 1 is placed in the vertical direction for example, and the partition 22 is set at an angle of 10° with the horizontal direction. The opening directions of the angles of the two adjacent partitions 22 with the horizontal direction are opposite, or in other words, the two adjacent partitions 22 are set at an angle. At this time, the angle between the two adjacent partitions 22 is twice the tilt angle of the partition 22, which is 20°. That is, in the radial direction of the tower body 1, one of the partitions 22 rotates clockwise at a certain angle, and the other partition 22 rotates counterclockwise at a certain angle. It can be understood that when the tower body 1 is set in the vertical direction, in the process of setting the angle of the partition 22, the side of the partition 22 with the connecting port 221 is tilted downward, which can ensure that the adsorbent particles flow down smoothly and the filling is more convenient. After the adsorbent is filled, due to the ingenious structural setting of the heat exchanger 2 of the present invention, the tower body 1 of the adsorption tower can be set in any direction without affecting the technical effect that can be achieved by the present invention, thereby increasing the applicable scenarios of the adsorption tower.

[0050] The present invention also discloses a gas drying adsorption system, which can be used in gas circulation drying scenarios with closed cycle requirements and non-closed cycle requirements, and is particularly suitable for gas circulation drying scenarios with closed cycle requirements. The gas drying adsorption system includes a heat exchange circuit and a drying regeneration circuit, and also includes at least one of the above-mentioned gas drying adsorption towers; the heat exchange circuit is connected to the heat exchanger 2 of the adsorption tower, and is used for heat exchange with the adsorbent in the adsorption tower and the gas entering the tower body 1; the drying regeneration circuit is connected to the air inlet and outlet 11 at both ends of the adsorption tower, and is used for gas drying and adsorbent regeneration. The gas drying adsorption system can quickly and conveniently switch the heat exchange medium of the heat exchanger 2 in the adsorption tower, and can also ensure that the working efficiency of the adsorption tower is always high while simplifying the adsorption system.

[0051] In some embodiments, Figure 6 As shown, the heat exchange circuit includes a cold source 7 and a heat source 8, and the cold source 7 and the heat source 8 are connected to the heat exchanger 2 of the adsorption tower through the first control valve assembly 3 and the second control valve assembly 4; the first control valve assembly 3 is arranged between the medium inlet of the heat exchanger 2 (the pipe mouth of any one of the bundled tubes 211 in the heat exchange tube 21 is used as the medium inlet of the heat exchanger 2, and the other is used as the medium inlet) and the cold medium outlet of the cold source 7 and the heat medium outlet of the heat source 8, and the second control valve assembly 4 is arranged between the medium outlet of the heat exchanger 2 and the return port of the cold medium of the cold source 7 and the return port of the heat medium of the heat source 8. It can be understood that the first control valve assembly 3 and the second control valve assembly 4 can be a single valve body or a control valve group composed of multiple valve bodies. By controlling the first control valve assembly 3 and the second control valve assembly 4, the cold medium in the cold source 7 and the heat medium in the heat source 8 can change the flow path quickly and conveniently, so as to realize the timely switching of the medium flowing into the heat exchanger 2 according to the working state of the adsorption tower.

[0052] In some embodiments, the drying and regeneration circuit includes a dryer and a gas storage device. The air inlet and outlet 11 at one end of the adsorption tower is connected to the dryer, and the air inlet and outlet 11 at the other end of the adsorption tower is connected to the gas storage device. It can be understood that the dryer, also known as the adsorption dryer, is used to absorb the gas to be dried and transport it to the adsorption tower for drying. The gas storage device can store the gas dried by the adsorption tower and can also provide regeneration circulating gas to the adsorption tower. The regeneration circulating gas is dry gas. The type of gas to be dried and the type of regeneration circulating gas can be the same or different. To prevent gas pollution, it is preferably the same type of regeneration circulating gas as the type of gas to be dried.

[0053] In some embodiments, the drying regeneration circuit also includes a third control valve assembly arranged between an air inlet and outlet 11 of the tower body 1 and the dryer, and a fourth control valve assembly arranged between another air inlet and outlet 11 of the tower body 1 and the gas storage device; it can be understood that the third control valve assembly and the fourth control valve assembly are used to control the on-off of the gas path in and out of the adsorption tower. When at least two of the above-mentioned adsorption towers are provided, the gas to be dried can be controlled to enter the adsorption tower in the drying condition by controlling the third control valve assembly, and the gas dried by the adsorption tower can be allowed to enter the gas storage device by controlling the fourth valve assembly, and the regenerated circulating gas can be allowed to enter the adsorption tower in the regeneration condition.

[0054] In some embodiments, Fig. 9 As shown, the gas drying adsorption system further includes a control unit 10, which can control the actions of each control valve assembly to switch the actual flow path of the drying regeneration circuit according to different working conditions of the adsorption tower. The control unit 10 can be a PLC control unit or other types of control units, which are not specifically limited here.

[0055] In some embodiments, a condensing device 9 is further provided on the drying and regeneration loop between the gas to be dried and the adsorption tower, for cooling the gas to be dried and performing preliminary drying.

[0056] For ease of understanding, the design ideas and control methods of the regeneration circulation loop and the heat exchange loop are briefly described by taking the case where two adsorption towers are provided and the type of the regeneration circulation gas is the same as the type of the gas to be dried as an example:

[0057] When two adsorption towers are provided, the first control valve assembly 3 and the second control valve assembly 4 in the heat exchange circuit can be set as a three-position four-way valve, and of course can also be set as a control valve group composed of multiple separate valve bodies. The following takes the example that the first control valve assembly 3 and the second control valve assembly 4 are both set as three-position four-way valves.

[0058] like Figure 6 As shown, the refrigerant outlet of the cold source 7 and the heat source 8 outlet of the heat source 8 are respectively connected to the two interfaces of the first control valve assembly 3 through pipelines, the other two interfaces of the first control valve assembly 3 are respectively connected to the medium inlets of the heat exchangers 2 of the two adsorption towers through pipelines, the medium outlets of the two heat exchangers 2 are respectively connected to the two interfaces of the second control valve assembly 4 through pipelines, and the other two interfaces of the second control valve assembly 4 are respectively connected to the heat medium return port of the heat source 8 and the refrigerant return port of the cold source 7 through pipelines.

[0059] In order to meet the needs of long-term gas adsorption drying, when the heat exchange circuit in the gas drying adsorption system is working, one of the adsorption towers can be used for gas drying, and the other adsorption tower can be used for adsorbent regeneration cycle operation. The two adsorption towers are used alternately. At this time, Figure 7 As shown, the connected first control valve assembly 3 has a first inflow station 31 where the refrigerant is respectively introduced into the two adsorption towers, a second inflow station 32 where the refrigerant and the heat medium are respectively introduced into the two adsorption towers, and a third inflow station 33 where the refrigerant and the heat medium are respectively introduced into an adsorption tower different from the second inflow station 32, wherein the second inflow station 32 and the third inflow station 33 can be understood as switching of the heat exchanger 2 of the same adsorption tower to connect to the cold source 7 or the heat source 8.

[0060] like Figure 8 As shown, the connected second control valve assembly 4 has a first reflow station 41 where the refrigerant of the two adsorption towers returns to the reflow port of the cold source 7, a second station where the refrigerant of one adsorption tower returns to the reflow port of the cold source 7, and the heat medium of the other adsorption tower returns to the reflow port of the heat source 8, and a third reflow station 43 with flow path switching with the second reflow station 42, wherein the second reflow station 42 and the third reflow station 43 can both allow the refrigerant to return to the reflow port of the cold source 7 and allow the heat medium to return to the reflow port of the heat source 8.

[0061] like Figure 6-Figure 8As shown, when the adsorption tower on the left is in the gas drying operation, the adsorbent will heat up, thereby affecting the drying efficiency. In order to avoid this situation, the first control valve assembly 3 in the control heat exchange circuit is located at the second inflow station 32, and the second control valve assembly 4 is located at the second reflux station 42. The refrigerant in the cold source 7 flows into the heat exchanger 2 of the left adsorption tower, exchanges heat with the adsorbent and the gas to be dried flowing into the adsorption tower, and refluxes to the reflux port of the cold source 7 through the second control valve assembly 4, ensuring that the temperature in the tower is kept within a relatively low range during the gas drying operation of the left adsorption tower, thereby ensuring that the adsorption tower is always in a high-efficiency drying condition; at this time, the adsorption tower on the right is in a regeneration condition, and during the initial heating and dehydration process, the heat from the heat source 8 The medium flows into the right adsorption tower to exchange heat between the adsorbent and the regenerated circulating gas, so that the adsorbent particles and the regenerated circulating gas in the tower can be at a higher temperature, thereby improving the dehydration efficiency of the adsorbent; and in the later cold blowing process, the first control valve assembly 3 switches the first inflow station 31, and the second control valve assembly 4 switches to the first reflux station 41. Without affecting the drying operation of the adsorption tower on the left, the temperature of the adsorbent in the right adsorption tower is quickly cooled, and the right adsorption tower is prepared for the drying gas operation. At the same time, there is no need to heat the regenerated circulating gas separately, and the adsorbent in the adsorption tower can be highly efficiently recycled and regenerated, reducing the use of regenerated circulating gas, simplifying the structure of the adsorption tower and reducing the complexity of the adsorption system.

[0062] like Fig. 9 As shown, the dryer (not shown in the figure) in the drying and regeneration loop is connected to the air inlet and outlet 11 at the upper ends of the two adsorption towers through pipelines, and the air inlet and outlet 11 at the lower ends of the two adsorption towers are connected to the gas storage device (not shown in the figure) through pipelines. The gas storage device can store the dried gas and the regenerated circulating gas (dry gas). In this embodiment, the regenerated circulating gas is of the same type as the gas to be dried, so they can share a set of gas storage equipment for storage, and the air inlet and outlet of the gas storage device are respectively connected to the air inlet and outlet 11 at the lower ends of the two adsorption towers through pipelines.

[0063] Among them, the third control valve assembly includes a first air inlet valve 51 and a first air return valve 52. The first air inlet valve 51 is arranged between the air outlet of the condensing device 9 and the pipelines of the air inlets and outlets 11 of the two adsorption towers, and is used to control the gas to be dried to selectively enter any adsorption tower. The first air return valve 52 is arranged between the air inlet of the condensing device 9 and the air inlet and outlet 11 at the upper ends of the two adsorption towers, and is arranged in parallel with the pipeline where the first air inlet valve 51 is located, and is used to selectively connect any adsorption tower with the air inlet of the condensing device 9, so that the moist regeneration circulating gas is dried again.

[0064] The fourth control valve assembly includes a second air inlet valve 61 and a second air return valve 62, which are connected in parallel and are respectively connected to the air inlet and outlet 11 at the lower ends of the two adsorption towers, wherein the second air inlet valve 61 is connected to the outlet of the regeneration cycle gas of the gas storage device through a pipeline, and is used to selectively pass the regeneration cycle gas of any adsorption tower, and the second air return valve 62 is connected to the air inlet of the dry gas of the gas storage device through a pipeline, and is used to selectively collect and store the gas dried by any adsorption tower. Preferably, a compression device is provided between the dry gas inlet of the gas storage device and the second air return valve 62, and the gas dried by the adsorption tower is compressed and stored in the gas storage device. It can be understood that the first air inlet valve 51, the first air return valve 52, the second air inlet valve 61, and the second air return valve 62 in this embodiment are all taken as two-position three-way valves, and are explained in conjunction with the corresponding pipeline optimization design. In other embodiments, multiple separate valve bodies can also control the opening and closing of multiple independent pipelines.

[0065] The control unit 10 is connected to each valve body for communication, and can control the heat exchange circuit and the drying and regeneration circuit in linkage to realize the rapid switching of the adsorption tower working conditions. When the left adsorption tower is performing drying operation and the right adsorption tower is performing the heating and dehydration operation in the initial stage of regeneration, the control unit 10 controls the first air inlet valve 51 to operate, connecting the pipeline between the dryer and the air inlet and outlet 11 of the left adsorption tower, and the first air return valve 52 to operate to connect the pipeline between the air inlet and outlet 11 of the right adsorption tower and the air inlet of the condensing device 9; the second air inlet valve 61 operates to connect the pipeline between the right adsorption tower and the outlet of the regenerated circulating gas of the gas storage device, and the second air return valve 62 operates to connect the pipeline between the left adsorption tower and the air inlet of the dry gas of the gas storage device.

[0066] At the same time, the control unit 10 controls the first control valve assembly 3 to operate, connecting the pipeline between the medium inlet of the heat exchanger 2 in the left adsorption tower and the refrigerant outlet of the cold source 7, and the pipeline between the medium inlet of the heat exchanger 2 in the right adsorption tower and the heat medium outlet of the heat source 8, and the second control valve assembly 4 operates, connecting the pipeline between the medium outlet of the heat exchanger 2 in the left adsorption tower and the refrigerant return port of the cold source 7, and the pipeline between the medium outlet of the heat exchanger 2 in the right adsorption tower and the heat medium return port of the heat source 8. Among them, how the first control valve assembly 3 and the second control valve assembly 4 operate has been described in the previous text and will not be repeated here.

[0067] When the left adsorption tower is performing drying operation and the right adsorption tower is performing cold blowing operation in the late regeneration stage, the pipeline in the drying and regeneration circuit remains on and off, and only the corresponding valve body action in the heat exchange circuit needs to be switched.

[0068] When the left adsorption tower is switched to the initial stage of regeneration operation and the right adsorption tower is switched to the drying operation, it is only necessary to switch the on-off state of each control valve in the drying regeneration circuit with the on-off state when the left adsorption tower is drying operation and the right adsorption tower is regenerating operation. The principle is the same as above and will not be repeated. At this time, the first control valve assembly 3 in the heat exchange circuit is switched to the third inflow position 33, and the second control valve assembly 4 is switched to the third reflux position 43, so that the left adsorption tower heat exchanger 2 is connected to the heat source 8, and the right adsorption tower is connected to the cold source 7.

[0069] When the left adsorption tower is in the later stage of regeneration operation and the right adsorption tower is in the drying operation, it is only necessary to switch the first control valve assembly 3 in the heat exchange circuit to the first inflow position 31 and the second control valve assembly 4 to the first reflux position 41 so that the two adsorption towers are connected to the cold source 7 at the same time.

[0070] In other embodiments, the type and number of control valves and the control mode of the control unit 10 can be changed according to actual operation requirements, so that two adsorption towers can perform drying and regeneration operations at the same time. It can be understood that in gas drying adsorption systems with other numbers of adsorption towers, it is only necessary to adaptively adjust the control valves and corresponding pipelines according to actual needs, and the working principle is the same as the above principle, which also belongs to the protection scope of the present invention.

[0071] The heat exchanger in the adsorption tower of the present invention can not only exchange heat with the adsorbent in the tower to control the temperature in the tower, but also fully exchange heat with the gas introduced into the tower through the ingenious arrangement of the partitions. There is no need to heat up or cool the gas in advance, thereby simplifying the structure and making full use of the heat exchanger, thereby improving the heat exchange efficiency of the heat exchanger.

[0072] The gas drying adsorption system provided by the present invention includes a heat exchange circuit and a drying regeneration circuit, and also includes at least one gas drying adsorption tower as described above; the heat exchange circuit is connected to the heat exchanger of the adsorption tower, and is used for heat exchange with the adsorbent in the adsorption tower and the gas entering the tower body; the drying regeneration circuit is connected to the air inlet and outlet at both ends of the adsorption tower, and is used for drying the gas and regenerating the adsorbent. The system can quickly and conveniently switch the heat exchange medium of the heat exchanger in the adsorption tower, and can simplify the adsorption system while ensuring that the working efficiency of the adsorption tower is always high.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An adsorption tower for gas drying, characterized in that: include: A tower body (1), wherein the tower body (1) is filled with an adsorbent, and gas inlets and outlets (11) are respectively provided at both ends of the tower body (1) for allowing the gas to be dried and the regenerated circulating gas to flow in the tower body (1), wherein the adsorbent is used to dry the gas to be dried, and the regenerated circulating gas is used to circulate and regenerate the adsorbent; A heat exchanger (2) is arranged inside the tower body (1) along the length direction of the tower body (1) and is used for exchanging heat with the adsorbent and the gas entering the tower body (1). The heat exchanger (2) comprises a heat exchange tube (21) and a partition (22). The heat exchange tube (21) is extended along the length direction of the tower body (1), and media of different temperatures can flow into the heat exchange tube (21). The partition (22) is sleeved outside the heat exchange tube (21) and is arranged at intervals along the length direction of the tower body (1), so as to divide the interior of the tower body (1) into a plurality of interconnected cavities.

2. The gas drying adsorption tower according to claim 1, characterized in that: The tower body (1) comprises a first tower body (12) and a second tower body (13), and the first tower body (12) and the second tower body (13) are detachably and hermetically connected.

3. The gas drying adsorption tower according to claim 1, characterized in that: A plurality of heat exchange tubes (21) are provided, and the plurality of heat exchange tubes (21) penetrate into and out of the same end of the tower body (1) and extend along the length direction of the tower body (1). The plurality of heat exchange tubes (21) are evenly and spaced apart.

4. The gas drying adsorption tower according to claim 1, characterized in that: The heat exchange tube (21) comprises a plurality of heat exchange sub-tubes connected end to end in sequence, and each heat exchange sub-tube is extended along the length direction of the tower body (1).

5. The gas drying adsorption tower according to claim 1, characterized in that: The edge of the partition plate (22) is in contact with the inner wall of the tower body (1), and a communication port (221) is provided on one side thereof in a direction perpendicular to the axial direction of the tower body (1).

6. The gas drying adsorption tower according to claim 5, characterized in that: Along a direction perpendicular to the axial direction of the tower body (1), the communicating openings (221) of two adjacent partitions (22) are respectively arranged on two sides of the tower body (1).

7. The gas drying adsorption tower according to claim 1, characterized in that: The partition plates (22) are arranged at an angle, and the angle between the partition plates (22) and a plane perpendicular to the axial direction of the tower body (1) is in the range of 5°-15°, and two adjacent partition plates (22) are arranged at an angle.

8. Gas drying adsorption system, characterized in that: It comprises a heat exchange circuit and a drying and regeneration circuit, and also comprises at least one gas drying adsorption tower as claimed in any one of claims 1 to 7; The heat exchange circuit is connected to the heat exchanger (2) of the adsorption tower and is used for exchanging heat with the adsorbent in the adsorption tower and the gas entering the tower body (1); The drying and regeneration loop is connected to the gas inlet and outlet (11) at both ends of the adsorption tower and is used for drying the gas and regenerating the adsorbent.

9. The gas drying adsorption system according to claim 8, characterized in that: The heat exchange circuit comprises a cold source (7) and a heat source (8), wherein the cold source (7) and the heat source (8) are connected to the heat exchanger (2) of the adsorption tower via a first control valve assembly (3) and a second control valve assembly (4); The first control valve assembly (3) is arranged between the medium inlet of the heat exchanger (2) and the refrigerant outlet of the cold source (7) and the heat medium outlet of the heat source (8), and the second control valve assembly (4) is arranged between the medium outlet of the heat exchanger (2) and the return port of the refrigerant of the cold source (7) and the return port of the heat medium of the heat source (8).

10. The gas drying adsorption system according to claim 8, characterized in that: The drying regeneration loop comprises a dryer and a gas storage device, the gas inlet and outlet (11) at one end of the adsorption tower is connected to the dryer, and the gas inlet and outlet (11) at the other end of the adsorption tower is connected to the gas storage device.

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