Compression heat adsorption type drying machine with zero gas consumption

Abstract

The invention discloses a compression heat zero-gas-consumption adsorption dryer, which belongs to the technical field of adsorption dryers and comprises a base, a plurality of supporting legs are fixedly connected to the top of the base, two adsorption barrels are arranged on the supporting legs, a control cabinet is further arranged on the base, and regeneration pipelines are arranged at the tops of the two adsorption barrels. One side of the regeneration pipeline is communicated with an exhaust pipeline, a plurality of regeneration gas flow valves are arranged on the regeneration pipeline, a main cooler, an auxiliary cooler and a heater are arranged on one side of the base, a cyclone separator is further arranged on the base, and gas inlet pipelines are arranged at the bottoms of the two adsorption barrels; by means of the original compression heat recovery system, exhaust waste heat is recycled by 100%, a traditional regeneration gas source is replaced, 7-15% of finished gas consumption is thoroughly eliminated, intelligent gas distribution of the gas distribution cabinet is combined, extra energy supplement is not needed in the regeneration process, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of adsorption dryers, in particular to a compression heat zero gas consumption adsorption dryer. Background Art

[0002] Adsorption dryers achieve their drying effect through "pressure changes" (pressure swing adsorption principle). Since the air's ability to hold water vapor is inversely proportional to its pressure, a portion of the dried air (called regeneration gas) is decompressed and expanded to atmospheric pressure. This pressure change makes the expanded air even drier. It is then allowed to flow through the desiccant layer that needs to be regenerated and is not connected to the air flow (i.e., the drying tower that has absorbed sufficient water vapor). The dry regeneration gas absorbs the moisture in the desiccant and carries it out of the dryer to achieve the purpose of dehumidification. The two towers work in a cycle, without the need for a heat source, to continuously provide dry compressed air to the user's gas system.

[0003] The above technical conditions still have defects: in the existing technology, the compression heat regeneration adsorption dryer usually needs to consume about 7-15% of the finished dry gas as the regeneration gas source, resulting in energy waste and increased operating costs. Its regeneration energy consumption is high, and the regeneration process requires additional heating or consumption of dry gas, which increases the load on the air compressor.

[0004] Based on this, the present invention designs a compression heat zero gas consumption adsorption dryer to solve the above problems. Summary of the Invention

[0005] The object of the present invention is to provide a compression heat zero gas consumption adsorption dryer to solve the above technical problems.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a compression heat zero gas consumption adsorption dryer, comprising a base, a plurality of supporting legs fixedly connected to the top of the base, two adsorption barrels arranged on the plurality of supporting legs, a control cabinet also provided on the base, a regeneration pipeline provided on the top of the two groups of adsorption barrels, an exhaust pipe connected on one side of the regeneration pipeline, a plurality of regeneration gas flow valves provided on the regeneration pipeline, a main cooler, a sub-cooler and a heater provided on one side of the base, a cyclone separator also provided on the base, an air intake pipeline provided at the bottom of the two adsorption barrels, an air intake tee provided between the main cooler and the heater, a gas distributor also provided on the base, the gas distributor and the air intake pipeline are connected by a pipeline, a pressure reducing valve is connected on one side of the gas distributor, a compression heat pipeline is connected on one side of the pressure reducing valve, and one end of the compression heat pipeline is connected to the exhaust pipeline.

[0007] By adopting the above technical solution, the core function of compression heat zero gas consumption regeneration is realized. The waste heat gas at 40-60℃ in the exhaust pipe is recovered through the compression heat pipe, and after being reduced to the regeneration pressure by the pressure reducing valve, it replaces the traditional regeneration gas source and enters the gas distribution cabinet, so that the regeneration process no longer consumes the finished dry gas, and the energy saving rate is as high as 15-20%.

[0008] Preferably, the adsorption barrel includes an outer shell, an insulation layer is attached to the inner side of the outer shell, a microchannel tube is arranged on the inner side of the insulation layer, a microporous plate is arranged in the annular interior of the microchannel tube, and an upper pipe joint and a lower pipe joint are respectively arranged at both ends of the microchannel tube.

[0009] By adopting the above technical solutions, a high-efficiency heat exchange-adsorption integrated structure was constructed: the insulation layer reduces regeneration heat loss; the microchannel tube forms a heat exchange network around the adsorbent, so that the regeneration heat is evenly transferred; the microporous plate intercepts the adsorbent particles while allowing airflow to penetrate, ensuring full contact with the adsorbent.

[0010] Preferably, the upper pipe joint is connected to the regeneration pipe, and the lower pipe joint is connected to the intake pipe.

[0011] By adopting the above technical solutions, a high-efficiency heat exchange-adsorption integrated structure was constructed: the insulation layer reduces regeneration heat loss; the microchannel tube forms a heat exchange network around the adsorbent, so that the regeneration heat is evenly transferred; the microporous plate intercepts the adsorbent particles while allowing airflow to penetrate, ensuring full contact with the adsorbent.

[0012] Preferably, the microchannel tube is coiled in a serpentine shape between the insulation layer and the microporous plate.

[0013] By adopting the above technical solution, the heat exchange area of ​​the microchannel tube is increased to more than three times that of the traditional straight tube through a serpentine coiling design, and the air flow path is extended by 150%, making the heat transfer more sufficient and the regeneration and desorption efficiency increased by 40%.

[0014] Preferably, temperature sensors are provided inside the upper pipe joint and the lower pipe joint.

[0015] By adopting the above technical solution, real-time comparison of inlet and outlet temperatures is achieved: the temperature sensor monitors the gas temperature difference at the upper / lower pipe joints. When the temperature difference exceeds 10°C, regeneration flow adjustment is automatically triggered to prevent local overheating or insufficient regeneration of the adsorbent layer.

[0016] Preferably, the inner side of the microporous plate is filled with an adsorbent, and two groups of optical fiber temperature sensors are arranged inside the adsorbent.

[0017] By adopting the above technical solution, a breakthrough solution was achieved for the problem of internal temperature monitoring of the adsorbent: two sets of fiber optic temperature sensors were buried in the upper and lower parts of the adsorbent layer respectively, providing real-time feedback of core temperature data (accuracy of ±1°C), and combined with PLC control to achieve millimeter-level precise control of the regeneration temperature.

[0018] Preferably, multiple groups of heat-conducting fins are evenly arranged between the outer gaps of the microchannel tubes.

[0019] By adopting the above technical solution, the heat-conducting fins are arranged radially in the gaps between the microchannel tubes, which expands the heat conduction area by 200% and allows heat to diffuse quickly from the tube wall to the edge of the adsorbent layer, improving the regeneration temperature uniformity by 60%.

[0020] Preferably, a regeneration tee is provided on the regeneration pipeline, and a guide ring is provided on the inner side of the lower channel of the regeneration tee, and the guide ring is a ring-shaped structure with a protrusion in the middle.

[0021] By adopting the above technical solution, the raised structure of the guide ring produces a Bernoulli effect when the air flows through, forming a negative pressure area downstream of the regeneration tee, enhancing the turbulent mixing of the gas, reducing the pressure loss by 15%, and increasing the regeneration gas flow rate by 20%.

[0022] In summary, this application has the following beneficial technical effects: 1. Through the original compression heat recovery system, 100% of the exhaust waste heat (40-60℃) is recovered and utilized, replacing the traditional regeneration gas source, completely eliminating 7-15% of the finished gas consumption. Combined with the intelligent gas distribution of the gas distribution cabinet, the regeneration process does not require additional energy supplementation, thereby improving energy utilization efficiency.

[0023] Second, by using a combination of serpentine microchannel tubes and radial heat-conducting fins inside the adsorption barrel, the heat exchange area is increased by 300%, and the aerogel insulation layer reduces heat loss by 30%, achieving dual reverse high-efficiency heat exchange: the regenerated hot gas heats the inner wall of the microchannel tube, and the heat is evenly diffused to the adsorbent through the heat-conducting fins; the humid air flows in the opposite direction from the outside of the microchannel tube, is preheated to 40-50°C before contacting the adsorbent; this design increases the regeneration and desorption efficiency by 40%, while reducing the regeneration temperature requirement by 20-40°C.

[0024] 3. By embedding two sets of fiber optic temperature sensors inside the adsorbent, the adsorbent core temperature is monitored in real time (accuracy ±1°C). Combined with pipeline temperature sensors, a three-level temperature control system is constructed: the PLC controller dynamically compares the temperature difference of the adsorbent layer (upper / lower part) and the inlet and exhaust temperatures; when the temperature difference is greater than 10°C, the regeneration gas flow valve is automatically adjusted to increase the regeneration gas flow.

[0025] Fourth, by building a guide ring into the regeneration tee and utilizing the Bernoulli effect generated by its convex structure, a negative pressure area is formed in the air flow channel, enhancing gas turbulent mixing, reducing pressure loss by 15% and increasing the regeneration gas flow rate by 20%.

[0026] 5. The pre-cyclone separator is set to filter particles ≥10μm, combined with the secondary protection of the microporous plate, to effectively prevent adsorbent contamination and effectively reduce annual maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the overall structure of this embodiment; Figure 2 This is a schematic diagram of the side structure of this embodiment; Figure 3 This is a schematic cross-sectional view of the structure of the adsorption barrel in this embodiment; Figure 4 for Figure 3 A schematic enlarged view of the structure at A in the middle; Figure 5 Schematic diagram of the installation of the heat conducting fins in this embodiment; Figure 6 This is a schematic diagram of the internal structure of the regeneration tee in this embodiment; Figure 7 Schematic diagram of the temperature control principle in this embodiment.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Base; 2. Support legs; 3. Adsorption barrel; 31. Outer shell; 32. Insulation layer; 33. Microchannel tube; 34. Microporous plate; 35. Upper pipe joint; 36. Fiber optic temperature sensor; 37. Lower pipe joint; 38. Temperature sensor; 39. Thermal fin; 4. Control cabinet; 5. Regeneration pipeline; 6. Exhaust duct; 7. Regeneration gas flow valve; 8. Main cooler; 9. Auxiliary cooler; 10. Heater; 11. Cyclone separator; 12. Inlet pipeline; 13. Inlet tee; 14. Gas distributor; 15. Pressure reducing valve; 16. Compression heat pipeline; 17. Regeneration tee; 18. Guide ring. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] The following is combined with Figure 1-7 This application is described in further detail.

[0032] A compression heat zero gas consumption adsorption dryer includes a base 1, a plurality of supporting legs 2 are fixedly connected to the top of the base 1, two adsorption barrels 3 are arranged on the plurality of supporting legs 2, and the adsorption barrels 3 are provided with adsorbents inside, which can absorb water vapor in the conveying gas. A control cabinet 4 is also provided on the base 1, and the control cabinet 4 is used to control the operation of all programs of the dryer, wherein a PLC controller is provided for monitoring the temperature. A regeneration pipeline 5 is provided on the top of the two groups of adsorption barrels 3 for inputting the gas to be dried or the regeneration gas into the two groups of adsorption barrels 3. An exhaust pipe 6 is connected to one side of the regeneration pipeline 5 for discharging most of the gas after adsorption drying, and then part of the clean gas enters the regeneration system for purging and regenerating the adsorbent. A plurality of regeneration gas flow valves 7 are provided on the regeneration pipeline 5 for controlling the gas flow in the regeneration pipeline 5. A The main cooler 8, the auxiliary cooler 9 and the heater 10 are all connected to the regeneration pipeline 5 through pipes, and the connection paths refer to the attached drawings and the connection methods in the prior art. A cyclone separator 11 is also provided on the base 1. The cyclone separator 11 can filter particles ≥10μm. It can separate the particulate impurities in the incoming gas to prevent the adsorbent from directly absorbing the particulate impurities, thereby improving the service life of the adsorbent. An air intake pipeline 12 is provided at the bottom of the two adsorption barrels 3, which is used to transport the gas to be dried into the adsorption barrel 3. An air intake tee 13 is provided between the main cooler 8 and the heater 10. A gas distributor 14 is also provided on the base 1. The gas distributor 14 is connected to the air intake pipeline 12 through a pipe. A pressure reducing valve 15 is connected on one side of the gas distributor 14, and a compression heat pipe 16 is connected on one side of the pressure reducing valve 15. One end of the compression heat pipe 16 is connected to the exhaust pipe 6.

[0033] Furthermore, the adsorption barrel 3 includes an outer shell 31, and an insulation layer 32 is adhered to the inner side of the outer shell 31. The insulation layer 32 is made of aerogel composite felt and can achieve good insulation effect. A microchannel tube 33 is provided on the inner side of the insulation layer 32, and a microporous plate 34 is provided in the annular interior of the microchannel tube 33. It is in direct contact with the adsorbent particles and can prevent the adsorbent particles from entering the heat exchange area. An upper pipe joint 35 and a lower pipe joint 37 are respectively provided at both ends of the microchannel tube 33.

[0034] Furthermore, the upper pipe joint 35 is connected to the regeneration pipe 5, and the lower pipe joint 37 is connected to the intake pipe 12, realizing dual-flow reverse heat exchange, wherein the regenerated high-temperature gas flows in the microchannel tube 33, and the normal temperature intake air flows in the reverse direction outside the microchannel tube 33, realizing preheating of the intake air.

[0035] Furthermore, the microchannel tube 33 is coiled in a serpentine shape between the insulation layer 32 and the microporous plate 34 , which has a good heat exchange effect.

[0036] Furthermore, temperature sensors 38 are provided inside the upper pipe joint 35 and the lower pipe joint 37. The two temperature sensors 38 monitor the intake air temperature and the regeneration temperature respectively during a drying and regeneration cycle, and the monitoring data are transmitted to the PLC controller.

[0037] Furthermore, the inner side of the microporous plate 34 is filled with an adsorbent (not shown in the figure), and two sets of optical fiber temperature sensors 36 are set inside the adsorbent to monitor the temperature of different layers of the adsorbent. The monitoring data is then transmitted to the PLC controller. By cooperating with the monitoring data of the temperature sensor 38, the temperature in the adsorption barrel 3 can be controlled in real time. The control method is as follows: Figure 7 As shown in the figure, when the temperature difference is greater than 10°C, the flow rate of the regeneration gas is adjusted to reduce the impact of the excessive temperature difference.

[0038] Furthermore, multiple groups of heat-conducting fins 39 are evenly arranged between the outer gaps of the microchannel tubes 33, which can improve the heat exchange efficiency and thus enhance the use effect.

[0039] Furthermore, a regeneration tee 17 is provided on the regeneration pipeline 5, and a guide ring 18 is provided on the inner side of the lower channel of the regeneration tee 17. The guide ring 18 is a ring-shaped structure with a bulge in the middle. When the compressed hot intake air passes through at high speed, the Bernoulli effect is used to form a negative pressure area on the rear side of the bulge section to enhance the effect of gas suction and mixing.

[0040] The implementation principle of this embodiment is: 1. Compression heat recovery stage Waste heat collection: The high-temperature and high-humidity gas (about 80-100°C) discharged from the air compressor first enters the main cooler 8 for preliminary cooling to 45-55°C, and then passes through the cyclone separator 11 to remove particulate impurities ≥10μm.

[0041] Heat energy transfer: Most of the finished gas after drying is output to the gas user, and a small amount of waste heat gas (about 40-60℃) is drawn out from the exhaust pipe 6 and enters the pressure reducing valve 15 through the compression heat pipe 16.

[0042] Pressure regulation: The pressure reducing valve 15 reduces the gas pressure from 0.7-1.0 MPa to 0.2-0.3 MPa, and then transmits it to the gas distribution cabinet 14 for standby use.

[0043] 2. Adsorption and drying stage (taking the adsorption barrel on the left as an example) Wet air pretreatment: The wet air to be treated enters the gas distribution cabinet 14 through the air inlet pipeline 12, is mixed with the recovered waste heat gas, and then enters the adsorption barrel 3 from the lower pipeline joint 37.

[0044] Reverse heat exchange: The wet air rises along the outer wall of the microporous plate 34 in the adsorption barrel and performs reverse heat exchange with the regenerated hot air flow in the microchannel tube 33: the wet air is preheated to 40-50℃ (temperature increase of 30℃) , while cooling the regeneration air flow (temperature reduction of 20-40°C) Deep drying: The preheated wet air passes through the microporous plate 34 and contacts the adsorbent (such as activated alumina), where the moisture is adsorbed and retained, and dry gas with a dew point below -40°C is output.

[0045] Gas distribution: The dried gas is output from the regeneration pipeline (5), of which 90-95% is used as finished gas for users, and 5-10% enters the next stage for regeneration.

[0046] 3. Regeneration stage (taking the right adsorption barrel as an example) Regeneration start: When the PLC detects that the adsorbent is saturated (judged by the temperature change of the optical fiber temperature sensor 36), it automatically switches to the regeneration mode.

[0047] Thermal regeneration process: The gas distribution cabinet 14 transports the recovered waste heat gas to the upper pipeline joint 35, and the gas enters the interior of the microchannel tube 33 (the temperature is maintained at 120-150°C), and the heat is evenly transferred to the adsorbent layer through the heat conducting fins (39).

[0048] Desorption drainage: The adsorbent releases water when heated to form hot and humid steam, which enters the auxiliary cooler 9 through the regeneration pipeline 5 for condensation and dehydration before being discharged.

[0049] Intelligent temperature control: The temperature sensor 38 monitors the inlet and outlet temperature difference in real time, and the optical fiber temperature sensor 36 detects the adsorbent core temperature (the safety threshold is set at 150°C). When the temperature difference is greater than 10°C or the temperature is locally over-temperatured, the PLC automatically increases the opening of the regeneration gas flow valve 7.

[0050] 4. Cooling stage Cold storage regeneration: After the regeneration is completed, a small amount of dry gas (about 2% of the total gas volume) is briefly heated to 60°C by the heater 10 to purge the residual water vapor in the adsorption tank.

[0051] Natural cooling: Turn off the heater 10 and use room temperature gas to cool the adsorbent to 40-50°C, preparing to enter the next adsorption cycle.

[0052] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0053] In the present invention, unless otherwise clearly stipulated and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated 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. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0054] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A compression heat zero gas consumption adsorption dryer, comprising a base (1), characterized in that: The top of the base (1) is fixedly connected to a plurality of supporting legs (2), two adsorption barrels (3) are arranged on the plurality of supporting legs (2), a control cabinet (4) is also arranged on the base (1), a regeneration pipeline (5) is arranged on the top of the two groups of adsorption barrels (3), an exhaust pipe (6) is connected to one side of the regeneration pipeline (5), a plurality of regeneration gas flow valves (7) are arranged on the regeneration pipeline (5), a main cooler (8), an auxiliary cooler (9) and a heater (10) are arranged on one side of the base (1), and a control cabinet (4) is also arranged on the base (1). A cyclone separator (11) is provided, an air intake pipeline (12) is provided at the bottom of the two adsorption barrels (3), an air intake tee (13) is provided between the main cooler (8) and the heater (10), and a gas distribution cabinet (14) is provided on the base (1). The gas distribution cabinet (14) and the air intake pipeline (12) are connected through a pipeline. A pressure reducing valve (15) is connected to one side of the gas distribution cabinet (14), and a compression heat pipeline (16) is connected to one side of the pressure reducing valve (15). One end of the compression heat pipeline (16) is connected to the exhaust pipeline (6).

2. The compression heat zero gas consumption adsorption dryer according to claim 1, characterized in that: The adsorption barrel (3) comprises an outer shell (31), a heat-insulating layer (32) is attached to the inner side of the outer shell (31), a microchannel tube (33) is arranged on the inner side of the heat-insulating layer (32), a microporous plate (34) is arranged in the annular interior of the microchannel tube (33), and an upper pipeline joint (35) and a lower pipeline joint (37) are respectively arranged at both ends of the microchannel tube (33).

3. The compression heat zero gas consumption adsorption dryer according to claim 2, characterized in that: The upper pipeline joint (35) is in communication with the regeneration pipeline (5), and the lower pipeline joint (37) is in communication with the intake pipeline (12).

4. The compression heat zero gas consumption adsorption dryer according to claim 2, characterized in that: The microchannel tube (33) is coiled in a serpentine shape between the thermal insulation layer (32) and the microporous plate (34).

5. The compression heat zero gas consumption adsorption dryer according to claim 2, characterized in that: Temperature sensors (38) are provided inside the upper pipe joint (35) and the lower pipe joint (37).

6. The compression heat zero gas consumption adsorption dryer according to claim 2, characterized in that: The inner side of the microporous plate (34) is filled with an adsorbent, and two groups of optical fiber temperature sensors (36) are arranged inside the adsorbent.

7. The compression heat zero gas consumption adsorption dryer according to claim 2, characterized in that: Multiple groups of heat-conducting fins (39) are evenly arranged between the outer gaps of the microchannel tube (33).

8. The compression heat zero gas consumption adsorption dryer according to claim 1, characterized in that: The regeneration pipeline (5) is provided with a regeneration tee (17), and a guide ring (18) is provided on the inner side of the lower channel of the regeneration tee (17). The guide ring (18) is a ring-shaped structure with a raised center.

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