Zero-gas-consumption double-tower adsorption type drying machine

Abstract

A first adsorption tower and a second adsorption tower of the zero-gas-consumption double-tower adsorption type drying machine each comprise an adsorption tower body, a first airflow channel is formed in the axis position of the adsorption tower body in the axial direction of the adsorption tower body, a first separation part is arranged on the periphery of the first airflow channel, and a first cavity is formed between the first separation part and the first airflow channel; and a second airflow channel is formed between the first partition part and the adsorption tower body, so that gas of the first adsorption tower and gas of the second adsorption tower of the drying machine flow in the radial direction, and compared with the prior art that gas of the adsorption tower body of the drying machine flows in the axial direction, the problem of large pressure drop is effectively solved. The zero-gas-consumption double-tower adsorption type drying machine has the advantages that the pressure drop is low, the use cost can be reduced, and the system operation is smooth.

Description

Technical Field

[0001] The invention relates to the technical field of gas drying, and in particular to a zero-gas-consumption double-tower adsorption dryer. Background Art

[0002] Adsorption dryers are widely used in drying compressed gases. In order to reduce the dew point of the gas, the desiccant needs to be regenerated in time. In order to achieve continuous production and improve drying efficiency, double-tower adsorption dryers came into being, such as Figure 1 As shown. The device is provided with two adsorption towers: a first adsorption tower 1' and a second adsorption tower 2'. By controlling the opening or closing of the first pneumatic valve 5' and the second pneumatic valve 6', the two adsorption towers can alternately perform drying and regeneration operations, thereby realizing cyclic operation.

[0003] The regeneration of the adsorption tower is usually carried out through the regeneration pipeline 4', and the dry gas processed by the adsorption tower in the drying operation is introduced into the adsorption tower being regenerated, so as to regenerate the desiccant therein. In order to optimize the gas recovery process after regeneration and achieve zero gas consumption, the system controls the opening or closing of the third pneumatic valve 7' and the fourth pneumatic valve 8' to reintroduce the regenerated gas into the adsorption tower in the drying operation for drying treatment, because the regenerated gas contains a large amount of water.

[0004] The first adsorption tower 1' and the second adsorption tower 2' in the current technology both adopt axial gas flow mode, and the gas will encounter significant resistance when passing through the desiccant, resulting in a large pressure drop. In addition, the humid air pressure generated by the air compressor is high, while the gas pressure after regeneration is low. This pressure difference makes it impossible for the regenerated gas to effectively mix with the humid air of the air compressor and enter the adsorption tower for drying operation, thereby affecting the system circulation, reducing the regeneration efficiency of the desiccant and the overall performance of the dryer.

[0005] In order to reduce the resistance caused by the desiccant and reduce the gas pressure drop, a desiccant with a smaller resistance coefficient is usually selected, but this will increase the use cost of the dryer. In order to further promote the mixing of the regenerated gas and the wet air, an ejector 3' is often configured in the system. The working principle of the ejector 3' is similar to that of a Venturi tube. The wet air is ejected at high speed through the ejector to generate a negative pressure, which then inhales the regenerated gas and mixes the two before sending them to the adsorption tower for the drying operation. Although in most cases, the ejector 3' can effectively solve the problem of the integration of the regenerated gas, when the wet air pressure of the air compressor is low, the negative pressure generated by the ejector 3' is still not enough to completely inhale the regenerated gas, resulting in poor system circulation, which in turn affects the regeneration of the desiccant and the overall performance of the dryer. At the same time, a desiccant with a smaller resistance coefficient still needs to be used, and the problem of relatively high use cost has not been fundamentally solved. Summary of the invention

[0006] To this end, the present invention provides a zero-gas-consumption double-tower adsorption dryer, which mainly solves the technical problems that the adsorption tower of the prior art zero-gas-consumption double-tower adsorption dryer adopts an axial gas flow mode and cannot effectively overcome the large pressure drop, resulting in high use cost, poor circulation of the overall system of the dryer, affecting the regeneration of the desiccant and the overall performance of the dryer, and being unable to adapt to low-pressure air compressors.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A zero-gas-consumption double-tower adsorption dryer comprises a first adsorption tower, a second adsorption tower, a first pipe for inputting wet air and a second pipe for outputting dry air; further comprising an ejector, a third pipe, a fourth pipe, a fifth pipe, a sixth pipe, a seventh pipe, a tenth pipe and an eleventh pipe; the first adsorption tower and the second adsorption tower both comprise a cylindrical adsorption tower body; an upper cover is provided on the top of the adsorption tower body for closing the top thereof, and a lower cover is provided on the bottom for closing the bottom thereof; a tubular first airflow channel is provided at the axial position of the adsorption tower body along the axial direction thereof; a cylindrical mesh first partition is provided in the adsorption tower body at the periphery of the first airflow channel; the first partition The first chamber is surrounded by the first partition, the first airflow channel, the upper cover and the lower cover for placing a desiccant; the second airflow channel is surrounded by the first partition, the inner wall of the adsorption tower body, the upper cover and the lower cover; a plurality of first airflow holes connected to the first chamber are evenly distributed on the tube wall of the first airflow channel; the upper cover is provided with a plurality of upper cover air holes connected to the second airflow channel; the lower cover is provided with a lower cover air hole connected to the first airflow channel; the adsorption tower body is provided with a first airflow pipe and a second airflow pipe; the first airflow pipe is connected to the second airflow channel through the upper cover air holes; the second airflow pipe is connected to the first airflow channel through the lower cover air holes The flow channel is connected; one end of the first pipeline is connected to the injector inlet; one end of the third pipeline is connected to the injector outlet, and the other end is connected to one end of the fourth pipeline and the fifth pipeline respectively; the third pipeline is provided with a first cooler; the other end of the fourth pipeline is connected to the second airflow pipe of the first adsorption tower; the other end of the fifth pipeline is connected to the second airflow pipe of the second adsorption tower; one end of the sixth pipeline and the seventh pipeline are both connected to the injector adsorption port; the other end of the sixth pipeline is connected to the second airflow pipe of the first adsorption tower; the other end of the seventh pipeline is connected to the second airflow pipe of the second adsorption tower; the tenth pipeline and the eleventh pipeline are connected to the second airflow pipe of the first adsorption tower; The first and second ends of the tenth pipeline are connected to the second pipeline; the other end of the tenth pipeline is connected to the first airflow pipe of the first adsorption tower; the other end of the eleventh pipeline is connected to the first airflow pipe of the second adsorption tower; the eighth pipeline is connected between the tenth pipeline and the eleventh pipeline; the fourth pipeline is provided with a first pneumatic valve; the fifth pipeline is provided with a second pneumatic valve; the sixth pipeline is provided with a third pneumatic valve; the seventh pipeline is provided with a fourth pneumatic valve; the tenth pipeline is provided with a first one-way valve on the side of the second pipeline at the connection between the tenth pipeline and the eighth pipeline; the eleventh pipeline is provided with a second one-way valve on the side of the second pipeline at the connection between the eleventh pipeline and the eighth pipeline.

[0009] Optionally, a cylindrical mesh second partition is provided in the adsorption tower body at the outer periphery of the first partition; the second partition and the first partition, the upper cover and the lower cover form a second chamber for placing the adsorbent; the second air flow channel is the area enclosed by the second partition, the inner wall of the adsorption tower body, the upper cover and the lower cover.

[0010] Preferably, the eighth pipeline is provided with a second cooler.

[0011] Preferably, the eighth pipeline is provided with a fifth pneumatic valve.

[0012] Preferably, a ninth pipeline is also connected between the tenth pipeline and the eleventh pipeline; the first one-way valve is located on the tenth pipeline on the side of the connection between the tenth pipeline and the ninth pipeline facing the second pipeline; the second one-way valve is located on the eleventh pipeline on the side of the connection between the eleventh pipeline and the ninth pipeline facing the second pipeline; and the ninth pipeline is provided with a drying tower.

[0013] Preferably, the ninth pipeline is provided with a sixth pneumatic valve.

[0014] Optionally, it also includes an air collecting device arranged on the adsorption tower body; the plurality of air holes on the upper cover are all connected to the air collecting device; and the first air flow pipe is connected to the air collecting device.

[0015] Optionally, the gas collecting device is an upper collecting cover arranged on the top of the adsorption tower body; an upper collecting groove is opened on the bottom wall of the upper collecting cover; a plurality of upper cover air hole openings are all located in the upper collecting groove; the bottom end of the first air flow pipe passes through the upper collecting cover and extends into the upper collecting groove.

[0016] Optionally, a lower collecting cover is provided at the bottom of the adsorption tower body; a lower collecting groove is opened on the top wall of the lower collecting cover; the bottom of the air holes of the lower cover is located in the lower collecting groove; the top end of the second airflow pipe passes through the lower collecting cover and extends into the lower collecting groove.

[0017] Optionally, the air collecting device is a bronchus arranged at the opening of the upper cover air hole of the upper cover and connected to the upper cover air hole, and one end of a plurality of the bronchus away from the upper cover air hole is connected to the first airflow pipe.

[0018] The present invention has at least the following beneficial effects:

[0019] The first adsorption tower and the second adsorption tower provided therein each include an adsorption tower body, a first air flow channel is provided at the axial center position of the adsorption tower body along its axial direction, a first partition is provided on the periphery of the first air flow channel, a first chamber is formed between the first partition and the first air flow channel for placing a desiccant, and a second air flow channel is formed between the first partition and the adsorption tower body, so that the gas flow direction of the first adsorption tower and the second adsorption tower of the present application flows radially, compared with the gas axial flow mode of the adsorption tower in the prior art, such as Fig.10 The schematic diagram of the adsorption tower of the prior art dryer is shown, hereinafter referred to as "axis". Fig.11 The schematic diagram of the adsorption tower of the dryer of the present application is shown, hereinafter referred to as "diameter", according to the Darcy formula of the pressure drop equation:

[0020]

[0021] Among them, Δp is the pressure drop of gas through the pipeline; λ is the friction coefficient along the way; ρ is the velocity of the gas; v is the average velocity of the gas; h is the pipe length; s is the cross-sectional area of ​​the pipeline.

[0022] Friction coefficient λ along the pipe, Reynolds number Re, and relative roughness of the pipe wall about, that is

[0023] Under the same pipeline conditions, it can be assumed that λ is constant when the gas flows in the pipeline. The difference between axial flow and radial flow of gas is analyzed in the above case.

[0024] 1. From formula (1.1), we can know that the pressure drop caused by axial flow of gas is:

[0025]

[0026] Among them, H 轴 is the height of the adsorption tower; R 轴 It is the radius of the adsorption tower when the gas flows axially. It can be seen that in the axial flow mode, to reduce the pressure drop, the only way is to reduce H 轴 , or increase R 轴 This results in the actual product being flattened, increasing the floor space, and making it difficult to commercialize.

[0027] 2. From formula (1.1), we can know that the pressure drop caused by radial flow of gas is:

[0028]

[0029] Further arrangement of formula (1.3) yields:

[0030]

[0031] Among them, H 径is the height of the adsorption tower; R1 is the outer diameter of the first airflow channel; R2 is the inner diameter of the second airflow channel. It can be seen that in radial flow mode, to reduce the pressure drop, when R1 and R2 remain unchanged, it is only necessary to increase H 径 , H 径 The increase in H will not increase the floor space, making it easy to commercialize. 径 The increase will also increase the volume of the first chamber and the second chamber, which can effectively solve the possible reduction in drying capacity caused by the reduction in desiccant capacity when the axial direction changes to the radial direction.

[0032] At the same time, compared with the axial flow method in the prior art, the radial flow method of the present application greatly increases the contact area between the gas and the desiccant, and the contact time is shorter. This optimized airflow design significantly improves the contact efficiency between the gas and the desiccant, thereby greatly improving the adsorption efficiency of the desiccant.

[0033] It can be seen that the zero-gas-consumption double-tower adsorption dryer of the present application has the advantages of low pressure drop, reduced use cost, smooth system operation, etc.; at the same time, it has the advantage of improving the adsorption efficiency of the desiccant. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly explain the prior art and the present invention, the following briefly introduces the drawings required for describing the prior art and the embodiments of the present invention. Obviously, the drawings described below are only exemplary, and for those of ordinary skill in the art, other drawings can be derived from the provided drawings without creative work.

[0035] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0036] Figure 1 It is a structural schematic diagram of a zero-gas-consumption double-tower adsorption dryer in the prior art;

[0037] Figure 2 It is a structural schematic diagram of the zero gas consumption double-tower adsorption dryer of the present invention;

[0038] Figure 3 It is a structural schematic diagram of the first adsorption tower and the second adsorption tower of the zero gas consumption double-tower adsorption dryer of the present invention;

[0039] Figure 4It is an exploded view of the first adsorption tower and the second adsorption tower of the zero gas consumption double-tower adsorption dryer of the present invention;

[0040] Figure 5 It is a front view of the first adsorption tower and the second adsorption tower of the zero gas consumption double-tower adsorption dryer of the present invention;

[0041] Figure 6 The invention is an accessory of the zero gas consumption double tower adsorption dryer Figure 5 AA section view;

[0042] Figure 7 The invention is an accessory of the zero gas consumption double tower adsorption dryer Figure 5 BB section view;

[0043] Figure 8 The working principle of the zero gas consumption double tower adsorption dryer of the present invention is shown in FIG. Figure 1 ;

[0044] Fig. 9 The working principle of the zero gas consumption double tower adsorption dryer of the present invention is shown in FIG. Figure 2 ;

[0045] Fig.10 It is a schematic diagram of the principle of the adsorption tower of the prior art zero gas consumption double-tower adsorption dryer;

[0046] Fig.11 This is a schematic diagram of the principle of the adsorption tower of the zero-gas consumption double-tower adsorption dryer of the present application;

[0047] Description of reference numerals:

[0048] 1. First adsorption tower; 2. Second adsorption tower; 3. Ejector; 4. First cooler; 5. Second cooler; 6. Drying tower; 7. First pneumatic valve; 8. Second pneumatic valve; 9. Third pneumatic valve; 10. Fourth pneumatic valve; 11. Fifth pneumatic valve; 12. Sixth pneumatic valve; 13. First non-return valve; 14. Second non-return valve; 15. First pipeline; 16. Second pipeline; 17. Third pipeline; 18. Fourth pipeline; 19. Fifth pipeline; 20. Sixth pipeline; 21. Seventh pipeline; 22. Eighth pipeline; 23. The ninth pipeline; 24, the tenth pipeline; 25, the eleventh pipeline; 26, the adsorption tower body; 27, the first airflow pipe; 28, the second airflow pipe; 29, the upper collecting cover; 2901, the upper collecting tank; 30, the lower collecting cover; 3001, the lower collecting tank; 31, the upper cover; 3101, the upper cover air hole; 32, the lower cover; 3201, the lower cover air hole; 33, the first airflow channel; 3301, the first airflow hole; 34, the first partition; 35, the second partition; 36, the first chamber; 37, the second chamber; 38, the second airflow channel. DETAILED DESCRIPTION

[0049] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0050] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0051] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this application are usually used to facilitate intuitive understanding by comparing with the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product. Without departing from the technical concept disclosed in this application, changes in these relative positional relationships should also be regarded as the scope of this application.

[0052] The zero gas consumption double tower adsorption dryer of the present invention is as follows Figures 2 to 7As shown, a first adsorption tower 1, a second adsorption tower 2, a first pipeline 15 for inputting wet air, which is usually used to connect to an air compressor, and a second pipeline 16 are provided, and the dried dry air is output by the second pipeline 16. An ejector 3, a third pipeline 17, a fourth pipeline 18, a fifth pipeline 19, a sixth pipeline 20, a seventh pipeline 21, a tenth pipeline 24 and an eleventh pipeline 25 are also provided. The ejector 3 is a prior art product well known to those skilled in the art and will not be described in detail here. The first adsorption tower 1 and the second adsorption tower 2 have the same structure, and both include a cylindrical adsorption tower body 26. An upper cover 31 is provided on the top of the adsorption tower body 26 to close the top, and a lower cover 32 is provided on the bottom to close the bottom. A tubular first airflow channel 33 is provided along the axial direction of the adsorption tower body 26 at the axial center position, and a cylindrical mesh first partition 34 is provided in the adsorption tower body 26 on the outer periphery of the first airflow channel 33. In this way, the first partition 34 and the first airflow channel 33, the upper cover 31 and the lower cover 32 are surrounded to form a first chamber 36 for placing a desiccant. In this way, the first partition 34 and the inner wall of the adsorption tower body 26, the upper cover 31 and the lower cover 32 are surrounded to form a second airflow channel 38. A plurality of first airflow holes 3301 communicating with the first chamber 36 are evenly distributed on the tube wall of the first airflow channel 33, and the gas in the first airflow channel 33 can enter the first chamber 36 from the first airflow holes 3301. The upper cover 31 is provided with a plurality of upper cover air holes 3101 communicating with the second airflow channel 38, and the lower cover 32 is provided with lower cover air holes 3201 communicating with the first airflow channel 33. The adsorption tower body 26 is provided with a first airflow pipe 27 and a second airflow pipe 28. The first airflow pipe 27 is communicated with the second airflow channel 38 through the upper cover air holes 3101; the second airflow pipe 28 is communicated with the first airflow channel 33 through the lower cover air holes 3201. One end of the first pipeline 15 is connected to the inlet of the ejector 3; one end of the third pipeline 17 is connected to the outlet of the ejector 3, and the other end is connected to one end of the fourth pipeline 18 and the fifth pipeline 19 respectively, and a tee can be used to connect them. The third pipeline 17 is provided with a first cooler 4, and the first cooler 4 can select a commercially available cooler, which is well known to those skilled in the art and will not be repeated here. The humid air input by the air compressor is cooled by the first cooler 4 to remove a certain amount of moisture; the other end of the fourth pipeline 18 is connected to the second airflow pipe 28 of the first adsorption tower 1, and the other end of the fifth pipeline 19 is connected to the second airflow pipe 28 of the second adsorption tower 2; one end of the sixth pipeline 20 and the seventh pipeline 21 are both connected to the adsorption port of the ejector 3; the other end of the sixth pipeline 20 is connected to the second airflow pipe 28 of the first adsorption tower 1, and the other end of the seventh pipeline 21 is connected to the second airflow pipe 28 of the second adsorption tower 2. One end of the tenth pipeline 24 and the eleventh pipeline 25 are both connected to the second pipeline 16; the other end of the tenth pipeline 24 is connected to the first airflow pipe 27 of the first adsorption tower 1, and the other end of the eleventh pipeline 25 is connected to the first airflow pipe 27 of the second adsorption tower 2. The eighth pipeline 22 is connected between the tenth pipeline 24 and the eleventh pipeline 25.The fourth pipeline 18 is provided with a first pneumatic valve 7, the fifth pipeline 19 is provided with a second pneumatic valve 8, the sixth pipeline 20 is provided with a third pneumatic valve 9, and the seventh pipeline 21 is provided with a fourth pneumatic valve 10. In order to allow dry air to smoothly enter the second pipeline 16 during the drying operation of the first adsorption tower 1 or the drying operation of the second adsorption tower 2, a first non-return valve 13 is provided on the tenth pipeline 24 at the connection between the tenth pipeline 24 and the eighth pipeline 22, which faces the second pipeline 16 side, and a second non-return valve 14 is provided on the eleventh pipeline 25 at the connection between the eleventh pipeline 25 and the eighth pipeline 22, which faces the second pipeline 16 side.

[0053] Optionally, in some applications, it is not only required to obtain dry gas, but also to filter impurities in the gas, which requires the use of an adsorbent. For this purpose, a cylindrical mesh second partition 35 is provided in the adsorption tower body 26 on the outer periphery of the first partition 34. The second partition 35, the first partition 34, the upper cover 31 and the lower cover 32 form a second chamber 37 for placing the adsorbent. In this way, the wet air is dried by the desiccant and purified by the adsorbent. At this time, the second airflow channel 38 is the area surrounded by the second partition 35, the inner wall of the adsorption tower body 26, the upper cover 31 and the lower cover 32.

[0054] Preferably, the eighth pipe 22 introduces dried dry air to regenerate the desiccant in the first adsorption tower 1 or the second adsorption tower 2. In order to further improve the dryness of the regenerated dry air, a second cooler 5 is provided in the eighth pipe 22. The second cooler 5 can be a commercially available cooler, which is well known to those skilled in the art and will not be elaborated here. The dry air is cooled by the second cooler 5 to further remove a certain amount of moisture, thereby improving its dryness and enhancing the regeneration capacity.

[0055] Preferably, in order to control the regeneration operation, for example, after the regeneration operation is completed, the regeneration operation can be stopped. For this purpose, a fifth pneumatic valve 11 is provided in the eighth pipeline 22 .

[0056] Preferably, the drying capacity of the desiccant is related to the performance of the dryer. Therefore, in order to further improve the regeneration capacity, the ninth pipeline 23 is also connected between the tenth pipeline 24 and the eleventh pipeline 25. In order not to affect the functions of the first check valve 13 and the second check valve 14, the first check valve 13 is located on the tenth pipeline 24 on the side of the second pipeline 16 at the connection between the tenth pipeline 24 and the ninth pipeline 23, and the second check valve 14 is located on the eleventh pipeline 25 on the side of the second pipeline 16 at the connection between the eleventh pipeline 25 and the ninth pipeline 23. A drying tower 6 is provided in the ninth pipeline 23. The drying tower 6 is a commercially available product, which is well known to those skilled in the art and will not be described in detail here. The regenerated dry air is further dried by the drying tower 6 to remove a certain amount of moisture, improve its dryness, and increase the regeneration capacity.

[0057] Preferably, at the same time, in order to control the regeneration operation, for example, after the regeneration operation is completed, the regeneration operation can be stopped. For this purpose, a sixth pneumatic valve 12 is provided in the ninth pipeline 23.

[0058] Furthermore, through the control of the fifth pneumatic valve 11 and the sixth pneumatic valve 12, the second cooler 5 and the drying tower 6 can work together or separately. By further drying the regenerated dry air, the dryness of the desiccant is adjusted, and then the drying capacity of the dryer is adjusted to obtain different drying dew points, so that the dryer of the present application has stronger adaptability.

[0059] Optionally, multiple upper cover air holes 3101 are provided to facilitate gas flow in and out of the second air flow channel 38. To this end, in order to facilitate the multiple upper cover air holes 3101 to communicate with the first air flow pipe 27, a gas collecting device is also provided on the adsorption tower body 26. The multiple upper cover air holes 3101 are all connected to the gas collecting device, and the first air flow pipe 27 is connected to the gas collecting device.

[0060] In some specific applications, the gas collecting device is an upper collecting cover 29 arranged on the top of the adsorption tower body 26, and an upper collecting groove 2901 is opened on the bottom wall of the upper collecting cover 29. The openings of multiple upper cover air holes 3101 are all located in the upper collecting groove 2901, and the bottom end of the first air flow pipe 27 passes through the upper collecting cover 29 and extends into the upper collecting groove 2901.

[0061] At the same time, in order to make the overall appearance of the product beautiful, a lower collecting cover 30 is provided at the bottom of the adsorption tower body 26, and a lower collecting groove 3001 is opened on the top wall of the lower collecting cover 30. The bottom of the lower cover air hole 3201 is located in the lower collecting groove 3001, and the top end of the second air flow pipe 28 passes through the lower collecting cover 30 and extends into the lower collecting groove 3001.

[0062] In some other specific applications, the air collecting device is a bronchus (not marked in the drawings) connected to the upper cover air hole 3101 set at the opening position of the upper cover air hole 3101 of the upper cover 31, and the ends of the multiple bronches away from the upper cover air hole 3101 are connected to the first airflow pipe 27.

[0063] Here’s how this application works:

[0064] 1. The first adsorption tower 1 performs a drying operation, and the second adsorption tower 2 performs a regeneration operation. Figure 8As shown, the first pneumatic valve 7 and the fourth pneumatic valve 10 are opened, and the second pneumatic valve 8 and the third pneumatic valve 9 are closed; the humid air of the air compressor is input from the first pipeline 15, enters the ejector 3, enters the first cooler 4 through the third pipeline 17 to be cooled and dehydrated, enters the fourth pipeline 18, and then enters the first air flow channel 33 from the second air flow pipe 28, enters the first chamber 36 from the first air flow hole 3301, flows radially through the desiccant, and is dried; then it is collected in the second air flow channel 38, flows into the first air flow pipe 27 from the upper cover air hole 3101; then it enters the tenth pipeline 24, enters the second pipeline 16 through the first one-way valve 13 for discharge; when the second adsorption tower 2 performs the regeneration operation According to the actual requirements for the dew point of dry air, the fifth pneumatic valve 11 and / or the sixth pneumatic valve 12 are opened, and the dried dry air part enters the second adsorption tower 2 through the eighth pipeline 22 and / or the ninth pipeline 23 to regenerate the desiccant; first, the dry air enters the eleventh pipeline 25, and then enters the second air flow channel 38 through the first air flow pipe 27 and the upper cover air hole 3101, radially flows through the second chamber 37, and the desiccant therein is back-blown and regenerated; then it enters the first air flow channel 33 through the first air flow hole 3301, enters the seventh pipeline 21 through the second air flow pipe 28, is sucked in by the ejector 3 and mixed with the wet air into the third pipeline 17, and is input into the first adsorption tower 1 for drying.

[0065] 2. The second adsorption tower 2 performs a drying operation, and the first adsorption tower 1 performs a regeneration operation, such as Fig. 9 As shown, the first pneumatic valve 7 and the fourth pneumatic valve 10 are closed, the second pneumatic valve 8 and the third pneumatic valve 9 are opened, and the rest of the process refers to the process in which the first adsorption tower 1 performs the drying operation and the second adsorption tower 2 performs the regeneration operation. The two adsorption towers perform drying and regeneration alternately, and the cycle continues.

[0066] The above is a relatively specific and detailed description of the present application through general description and specific embodiments. It should be understood that, based on the technical concept of the present application, several conventional adjustments or further innovations can be made to these specific embodiments; however, as long as they do not deviate from the technical concept of the present application, the technical solutions obtained by these conventional adjustments or further innovations also fall within the scope of protection of the claims of the present application.

Claims

1. A zero-gas consumption double-tower adsorption dryer, comprising a first adsorption tower (1), a second adsorption tower (2), a first pipeline (15) for inputting wet air, and a second pipeline (16) for outputting dry air, characterized in that: The invention also comprises an ejector (3), a third pipeline (17), a fourth pipeline (18), a fifth pipeline (19), a sixth pipeline (20), a seventh pipeline (21), a tenth pipeline (24) and an eleventh pipeline (25); the first adsorption tower (1) and the second adsorption tower (2) both comprise a cylindrical adsorption tower body (26); the top of the adsorption tower body (26) is provided with an upper cover (31) for closing the top thereof, and the bottom is provided with a lower cover (32) for closing the bottom thereof; a tubular first airflow channel (33) is provided at the axial center position of the adsorption tower body (26) along the axial direction thereof; a cylindrical mesh-shaped first partition (34) is provided inside the adsorption tower body (26) at the outer periphery of the first airflow channel (33); the first partition (34) The first air flow channel (33), the upper cover (31) and the lower cover (32) form a first chamber (36) for placing a desiccant; the first partition (34) and the inner wall of the adsorption tower body (26), the upper cover (31) and the lower cover (32) form a second air flow channel (38); the tube wall of the first air flow channel (33) is evenly distributed with a plurality of first air flow holes (3301) connected to the first chamber (36); the upper cover (31) is provided with a plurality of upper cover air holes (3101) connected to the second air flow channel (38); the lower cover (32) is provided with a lower cover air hole (3201) connected to the first air flow channel (33); the adsorption tower body (26) is provided with a first air flow channel (38); The first air flow pipe (27) and the second air flow pipe (28); the first air flow pipe (27) is connected to the second air flow channel (38) through the upper cover air hole (3101); the second air flow pipe (28) is connected to the first air flow channel (33) through the lower cover air hole (3201); one end of the first pipeline (15) is connected to the inlet of the ejector (3); one end of the third pipeline (17) is connected to the outlet of the ejector (3), and the other end is connected to one end of the fourth pipeline (18) and the fifth pipeline (19) respectively; the third pipeline (17) is provided with a first cooler (4); the other end of the fourth pipeline (18) is connected to the second air flow pipe (28) of the first adsorption tower (1); the fifth pipeline (19) is connected to the outlet of the ejector (3); the third pipeline (17) is connected to the outlet of the ejector (3); the fourth pipeline (18) is connected to the outlet of the ejector (3); the fourth pipeline (19 ... The other end is in communication with the second air flow pipe (28) of the second adsorption tower (2); one end of the sixth pipeline (20) and the seventh pipeline (21) are both in communication with the adsorption port of the ejector (3); the other end of the sixth pipeline (20) is in communication with the second air flow pipe (28) of the first adsorption tower (1); the other end of the seventh pipeline (21) is in communication with the second air flow pipe (28) of the second adsorption tower (2); one end of the tenth pipeline (24) and the eleventh pipeline (25) are both in communication with the second pipeline (16); the other end of the tenth pipeline (24) is in communication with the first air flow pipe (27) of the first adsorption tower (1); the other end of the eleventh pipeline (25) is in communication with the first air flow pipe (27) of the second adsorption tower (2);The eighth pipeline (22) is connected between the tenth pipeline (24) and the eleventh pipeline (25); the fourth pipeline (18) is provided with a first pneumatic valve (7); the fifth pipeline (19) is provided with a second pneumatic valve (8); the sixth pipeline (20) is provided with a third pneumatic valve (9); the seventh pipeline (21) is provided with a fourth pneumatic valve (10); the tenth pipeline (24) is provided with a first non-return valve (13) at the connection between the tenth pipeline (24) and the eighth pipeline (22) and the side facing the second pipeline (16); the eleventh pipeline (25) is provided with a second non-return valve (14) at the connection between the eleventh pipeline (25) and the eighth pipeline (22) and the side facing the second pipeline (16).

2. The zero-gas-consumption double-tower adsorption dryer according to claim 1, characterized in that: A cylindrical mesh second partition (35) is provided inside the adsorption tower body (26) at the outer periphery of the first partition (34); the second partition (35) and the first partition (34), the upper cover (31) and the lower cover (32) form a second chamber (37) for placing an adsorbent; the second air flow channel (38) is an area enclosed by the second partition (35), the inner wall of the adsorption tower body (26), the upper cover (31) and the lower cover (32).

3. The zero-gas-consumption double-tower adsorption dryer according to claim 1, characterized in that: The eighth pipeline (22) is provided with a second cooler (5).

4. The zero-gas-consumption double-tower adsorption dryer according to claim 3, characterized in that: The eighth pipeline (22) is provided with a fifth pneumatic valve (11).

5. The zero-gas-consumption double-tower adsorption dryer according to claim 1, characterized in that: The tenth pipeline (24) and the eleventh pipeline (25) are further connected to a ninth pipeline (23); the first one-way valve (13) is located on the tenth pipeline (24) at a side of a connection between the tenth pipeline (24) and the ninth pipeline (23) facing the second pipeline (16); the second one-way valve (14) is located on the eleventh pipeline (25) at a side of a connection between the eleventh pipeline (25) and the ninth pipeline (23) facing the second pipeline (16); and the ninth pipeline (23) is provided with a drying tower (6).

6. The zero-gas-consumption double-tower adsorption dryer according to claim 5, characterized in that: The ninth pipeline (23) is provided with a sixth pneumatic valve (12).

7. The zero-gas-consumption double-tower adsorption dryer according to claim 1, characterized in that: It also includes a gas collecting device arranged on the adsorption tower body (26); the plurality of upper cover air holes (3101) are all connected to the gas collecting device; and the first air flow pipe (27) is connected to the gas collecting device.

8. The zero-gas-consumption double-tower adsorption dryer according to claim 7, characterized in that: The gas collecting device is an upper collecting cover (29) arranged on the top of the adsorption tower body (26); an upper collecting groove (2901) is opened on the bottom wall of the upper collecting cover (29); the openings of the plurality of upper cover air holes (3101) are all located in the upper collecting groove (2901); the bottom end of the first air flow pipe (27) passes through the upper collecting cover (29) and extends into the upper collecting groove (2901).

9. The zero-gas-consumption double-tower adsorption dryer according to claim 8, characterized in that: A lower collecting cover (30) is provided at the bottom of the adsorption tower body (26); a lower collecting groove (3001) is provided on the top wall of the lower collecting cover (30); the bottom of the lower cover air hole (3201) is located in the lower collecting groove (3001); the top end of the second air flow pipe (28) passes through the lower collecting cover (30) and extends into the lower collecting groove (3001).

10. The zero-gas-consumption double-tower adsorption dryer according to claim 7, characterized in that: The air collecting device is a bronchus arranged at the opening of the upper cover air hole (3101) of the upper cover (31) and connected to the upper cover air hole (3101), and the ends of the plurality of bronchi away from the upper cover air hole (3101) are all connected to the first airflow pipe (27).

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