Constant-dew-point heatless suction dryer based on double-tower adsorption

Abstract

The invention discloses a double-tower adsorption-based constant-dew-point heat-free adsorption dryer, which belongs to the technical field of dryers, integrates multi-sensing information acquisition and learning model prediction mechanism, and combines actual gas load of double adsorption towers with dew-point demand feedback. The double-tower switching time and the regeneration gas flow are dynamically adjusted according to the actual working condition, the limitation of traditional fixed mode switching and fixed flow regeneration is avoided, the double-tower adsorption dryer is upgraded to intelligent equipment capable of sensing, analyzing, deciding and executing, it is guaranteed that the dew point height of a gas outlet is constant, and the energy consumption is reduced. A front filtering mechanism and a rear filtering mechanism which are arranged in parallel are additionally arranged, so that intelligent switching of the double filtering mechanisms is switched according to gas flow changes, namely, the double filtering mechanisms are arranged in parallel, intelligent valve switching is adopted, and pressure difference sensing and control logic are utilized, so that the filtering efficiency is improved. And non-stop automatic switching of the filtering mechanism is realized.

Description

Technical Field

[0001] This invention relates to the field of dryer technology, and more specifically, to a constant dew point heatless adsorption dryer based on dual-tower adsorption. Background Technology

[0002] The heatless adsorption dryer utilizes the selective adsorption properties of adsorbents to adsorb certain components, adsorbing moisture from compressed air to achieve the purpose of drying. Since the adsorbent will reach saturation equilibrium after a certain period of adsorption, it needs to be regenerated with drying gas to restore its adsorption and drying capacity.

[0003] The heatless adsorption dryer uses a dual-tower system to utilize a portion of its own drying gas and reduce its pressure to near atmospheric pressure as regeneration gas for regeneration. The dual-tower system switches at a fixed switching time to continuously provide drying gas. For details, please refer to the main contents of patent numbers CN219333604U and CN214809660U.

[0004] Traditional dual-tower adsorption dryers typically use a fixed time to switch between adsorption and regeneration programs and a fixed flow rate for drying regeneration gas. This can indeed lead to low efficiency or unstable drying effects when operating conditions change. For example, if the adsorption is saturated and the switch is not made in time, the dew point of the outlet air will rise. If the switch is made before regeneration is complete, the adsorbent will not be fully regenerated. Specifically, if the tower is not saturated when the gas is introduced at a low load, the regeneration gas will be wasted. If the gas is introduced at a high load, the dew point may spike if the switch is not made in time.

[0005] However, the efficiency declines over time. When the incompletely regenerated tower switches back to adsorption mode, its adsorption capacity is greatly reduced and it will quickly become saturated. This results in the outlet dew point being unqualified for most of the working time. Furthermore, the regeneration is completed but the purge continues to consume dry air, causing waste of gas. To address the practical problems in the existing technology, a constant dew point heatless adsorption dryer based on dual-tower adsorption is proposed. Summary of the Invention

[0006] The purpose of this invention is to provide a constant dew point heatless desiccant dryer based on dual-tower adsorption, so as to solve the technical defects mentioned in the background art.

[0007] The objective of this invention can be achieved through the following technical solution: a constant dew point heatless desiccant dryer based on dual-tower adsorption, comprising a pair of adsorption towers, a lower pipe system installed between the lower ports of the pair of adsorption towers, and an upper pipe system installed between the upper ports of the pair of adsorption towers. A pair of pre-filters and a detection box acting together at the outlet port of the pre-filters are connected to the lower pipe system. A pair of post-filters are connected to the upper pipe system. The outlet ports of the pair of post-filters are connected to a common air guide pipe. A dew point sensor is installed on the air guide pipe. The detection box contains a gas detection module and a controller. The gas detection module includes an inlet pressure sensor, an inlet temperature sensor, an inlet humidity sensor, and a flow sensor, which are used to acquire inlet information, including inlet pressure, inlet humidity, inlet temperature, and inlet flow. The inlet information is input into a pre-trained and optimized adsorption capacity model to obtain the moisture loading rate. The moisture loading rate is input into a pre-trained and optimized regeneration gas flow rate regulation model to obtain the regeneration gas regulation flow rate, which is then regulated by the controller. The dew point sensor detects the dew point value at the gas outlet in real time and compares it with a preset dew point warning value. When the dew point value at the gas outlet is greater than or equal to the preset dew point warning value, the controller issues a dual-tower switching command.

[0008] Furthermore, the lower piping system includes an air inlet pipe connected to the air inlets of a pair of pre-filters and an air guide pipe connected to the air outlets of a pair of pre-filters. An air inlet switching valve is installed at the end of the air inlet pipe near the air inlet of the pre-filter. The other ends of the pair of air guide pipes are connected to the top of the test box. The bottom of the test box is connected to the air inlet ends of a pair of adsorption towers through an air inlet pipe. A switching valve corresponding to each adsorption tower is installed on the air inlet pipe. The end of the air inlet pipe near the air inlet end of the adsorption tower is connected to an external exhaust pipe and an external silencer. An external exhaust solenoid valve is installed at each end of the external exhaust pipe.

[0009] Furthermore, the upper piping system includes an outlet pipe connected between the outlet ends of a pair of adsorption towers. Both ends of the outlet pipe are connected to a regeneration conduit with a regulating valve. The middle part of the outlet pipe is connected to the inlet of a pair of post-filters through an exhaust pipe. Both ends of the outlet pipe near the exhaust pipe are equipped with outlet switching valves. The end of the exhaust pipe connected to the inlet of a pair of post-filters is equipped with an exhaust switching valve. The outlets of a pair of post-filters are connected to the main gas guide pipe through exhaust branch pipes.

[0010] Furthermore, the pre-filter includes a fixedly installed pre-filter cartridge and a flip cover embedded in the upper half of the pre-filter cartridge. The inner top wall of the flip cover has three-stage filtration components horizontally distributed, including a pre-filtration module, a precision coagulation filtration module, and an activated carbon filtration module.

[0011] Furthermore, the post-filter includes a fixedly installed post-filter cartridge and a second flip cover embedded in the upper end of the post-filter cartridge. The post-filter cartridge and the second flip cover are inclined downward from the air inlet to the air outlet. Multiple filter layers embedded in the bottom wall of the post-filter cartridge are horizontally arranged on the inner top wall of the second flip cover, and the multiple filter layers are inclined downward towards the air inlet.

[0012] Furthermore, the post-filter also includes a reverse jet cleaning module embedded in the top two ends of the flip cover and a dust removal module installed at the bottom end of the post-filter cartridge.

[0013] Furthermore, the back-blowing module includes a back-blowing box embedded in the top of the flip cover, with a pulse tube extending outward inserted through the back-blowing box, and multiple sets of blow nozzles corresponding to the filter layer distributed on the pulse tube.

[0014] Furthermore, the dust removal module includes a dust collection box embedded in the bottom end of the rear filter cartridge. The bottom wall of the rear filter cartridge has a dust removal groove that is connected to the dust collection box. Inside the dust collection box, a dust guide inclined plate that is connected to the dust removal groove is installed by an electric push rod. The lower end of the dust collection box is connected to a dust discharge pipe.

[0015] Optionally, flow sensors are also installed at the inlet of the pre-filter, the outlet of the adsorption tower, and the outlet of the post-filter. These flow sensors, in conjunction with those installed in the detection box, are used to detect the gas flow rates before and after filtration by the pre-filter, adsorption by the adsorption tower, and filtration by the post-filter.

[0016] Compared with the prior art, the advantages of this invention are: 1. It integrates multi-sensor information acquisition and learning model prediction mechanism, combining the actual gas load and dew point demand feedback of the dual adsorption towers to achieve dynamic adjustment of the dual tower switching time and regeneration gas flow rate according to the actual working conditions. It avoids the limitations of traditional fixed mode switching and fixed flow rate regeneration, and upgrades the dual tower adsorption dryer into an intelligent equipment capable of "sensing-analyzing-decision-execution". This ensures a high degree of stability of the gas outlet dew point and avoids unnecessary frequent switching and over-regeneration of the adsorbent, thus extending its service life.

[0017] 2. A fixed parallel dual filtration mechanism is added to the inlet and outlet of the adsorption tower, and the gas flow rate before and after the pre-filter, the adsorption tower, and the post-filter is detected to facilitate intelligent switching of the dual filtration mechanism according to changes in gas flow rate. That is, the parallel layout of the dual filtration mechanism and intelligent valve switching are adopted. Relying on differential pressure sensing and control logic, the filtration mechanism can be automatically switched without stopping. In addition, a backflush circuit is added to the post-filter to automatically control valve switching and perform backflush operation according to the gas flow rate and differential pressure signal. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the external structure of the present invention. Figure 2 ; Figure 3This is a schematic diagram of the structure of the pre-filter of the present invention; Figure 4 This is a split view of the pre-filter of the present invention; Figure 5 This is a split view of the post-filter of the present invention; Figure 6 Cross-sectional view of the post-filter of the present invention. Figure 1 ; Figure 7 Cross-sectional view of the post-filter of the present invention. Figure 2 ; Figure 8 This is a cross-sectional schematic diagram of the post-filter of the present invention during backflushing operation.

[0019] Explanation of the labels in the diagram: 1. Adsorption tower; 2. Lower piping system; 21. Intake pipe; 22. Intake vent pipe; 23. Exhaust vent pipe; 24. Switching valve; 25. Exhaust solenoid valve; 26. Intake switching valve; 27. Air guide pipe; 3. Upper piping system; 31. Outlet pipe; 32. Regeneration conduit; 33. Regulating valve; 34. Outlet switching valve; 35. Exhaust pipe; 36. Exhaust switching valve; 37. Exhaust branch pipe; 4. Pre-filter; 41. Pre-filter cartridge; 42. Flip cover one; 43. Three-stage filtration assembly; 5. Testing box; 6. Post-filter; 61. Post-filter cartridge; 62. Flip cover II; 63. Filter layer; 64. Backflush box; 641. Pulse tube; 642. Pulse jet nozzle; 65. Dust collection box; 66. Dust exhaust pipe; 67. Electric push rod; 68. Dust guide ramp; 7. Main air supply pipe; 8. Dew point sensor; 9. Muffler. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example 1: This invention discloses a constant dew point heatless desiccant dryer based on dual-tower adsorption. Please refer to [link to relevant documentation]. Figure 1 , Figure 2It includes a pair of adsorption towers 1, a lower pipe system 2 installed between the lower ports of the pair of adsorption towers 1, and an upper pipe system 3 installed between the upper ports of the pair of adsorption towers 1. A pair of pre-filters 4 and a detection box 5 that work together at the outlet port of the pre-filters 4 are installed on the lower pipe system 2. A pair of post-filters 6 are installed on the upper pipe system 3. The outlet ports of the pair of post-filters 6 are connected to a common gas guide pipe 7. A dew point sensor 8 is installed on the gas guide pipe 7. The lower piping system 2 includes an air inlet pipe 21 connected to the air inlet of a pair of pre-filters 4 and an air guide pipe 27 connected to the air outlet of a pair of pre-filters 4. An air inlet switching valve 26 is installed on the end of the air inlet pipe 21 near the air inlet of the pre-filters 4. The other end of the pair of air guide pipes 27 is connected to the top of the test box 5. The bottom of the test box 5 is connected to the air inlet of a pair of adsorption towers 1 through an air inlet pipe 22. A switching valve 24 corresponding to each adsorption tower 1 is installed on the air inlet pipe 22. The end of the air inlet pipe 22 near the air inlet of the adsorption tower 1 is connected to an external exhaust pipe 23 and connected to an external silencer 9. An external exhaust solenoid valve 25 is installed at both ends of the external exhaust pipe 23.

[0022] The upper piping system 3 includes an outlet pipe 31 connected between the outlet ends of a pair of adsorption towers 1. Both ends of the outlet pipe 31 are connected to a regeneration conduit 32 with a regulating valve 33. The middle part of the outlet pipe 31 is connected to the inlet of a pair of post-filters 6 through an exhaust pipe 35. Both ends of the outlet pipe 31 near the exhaust pipe 35 are equipped with outlet switching valves 34. The end of the exhaust pipe 35 that connects to the inlet of a pair of post-filters 6 is equipped with an exhaust switching valve 36. The outlets of a pair of post-filters 6 are connected to the main air guide pipe 7 through exhaust branch pipes 37.

[0023] The detection chamber 5 is equipped with a gas detection module and a controller. The gas detection module includes an intake pressure sensor, an intake temperature sensor, an intake humidity sensor, and a flow sensor to acquire intake information, including intake pressure, intake humidity, intake temperature, and intake flow rate. The intake information is input into a pre-trained and optimized adsorption capacity model to obtain the moisture loading rate. The moisture loading rate is then input into a pre-trained and optimized regeneration gas flow rate regulation model to obtain the regeneration gas regulation flow rate. The controller regulates the regeneration gas flow rate. Both the adsorption capacity model and the regeneration gas flow rate regulation model are deep machine learning models. The adsorption capacity model continuously learns the various feature parameters in the intake information to accurately obtain the moisture loading rate for new feature parameters. Similarly, the regeneration gas flow rate regulation model continuously learns the moisture loading rate under different operating conditions to accurately obtain the regeneration gas regulation flow rate for the moisture loading rate under new operating conditions.

[0024] The dew point sensor 8 detects the dew point value at the gas outlet in real time and compares it with the preset dew point warning value. When the dew point value at the gas outlet is greater than or equal to the preset dew point warning value, for example, when the target dew point is -40℃, the controller issues a dual-tower switching command when the dew point is detected to rise to -38℃.

[0025] The specific working principle is as follows: the wet compressed air inlet pipe 21 is introduced into one of the pre-filters 4 for pre-filtration to remove oil mist and impurities, and then flows from top to bottom through the adsorbent bed of one of the adsorption towers 1. The moisture is captured by the adsorbent, and the dried air flows out from the top of the tower. It is switched to one of the post-filters 6 through the outlet switching valve 34 for post-filtration to remove adsorbent dust. Most of the dry air flows to the user's pipeline network through the air guide main pipe 7, and a small part of the dry air flows to another adsorption tower 1 through the regeneration pipe 32 for adsorbent regeneration. The low-pressure regeneration airflow blows the saturated adsorbent in the opposite direction to desorb the moisture and carry it out of the tower. The moisture-rich regeneration gas is discharged into the atmosphere through the silencer 9, and the noise is effectively reduced. This process integrates the acquisition of flow rate, dew point, pressure, and temperature information, and uses a learning model to predict the regeneration gas flow rate. It combines the actual gas load of the dual adsorption towers with the dew point demand feedback to achieve dynamic adjustment of the dual tower switching time and dynamic adjustment of the regeneration gas flow rate according to the actual working conditions. This avoids the limitations of traditional fixed mode switching and fixed flow rate regeneration. For example, if the dryer uses a fixed switching time, when the flow rate of the processed air increases or the inlet temperature or humidity rises, the adsorbent will become saturated in advance, but the timer has not reached the switching time, so it cannot switch to regeneration, which will lead to a period of "saturation breakthrough" and cause the outlet dew point to rise. Upgrading the dual-tower adsorption dryer into an intelligent device capable of "sensing, analyzing, deciding, and executing" ensures a highly stable gas outlet dew point, improves the reliability of downstream processes, avoids unnecessary frequent switching and over-regeneration of the adsorbent, and extends its service life. Especially during low-load periods, it significantly reduces regeneration gas consumption. A dynamic, feedback-based control strategy is adopted to ensure that the adsorbent always operates in optimal condition.

[0026] Example 2: Please refer to Figure 2 and Figure 4 The pre-filter 4 includes a fixedly installed pre-filter cartridge 41 and a flip cover 42 embedded in the upper half of the pre-filter cartridge 41. The top wall of the flip cover 42 is horizontally distributed with three-stage filtration components 43, which include a pre-filtration module, a precision coagulation filtration module and an activated carbon filtration module. The pre-filtration module uses borosilicate glass fiber or special organic synthetic fiber as its filter material. When air containing oil and water aerosols passes through, tiny droplets continuously collide with the fibers and condense into larger droplets until they sink to the bottom of the filter cup due to gravity. The precision condensation filter module uses high-efficiency glass fiber as its filter material to deeply remove micron- and submicron-sized oil mist and aerosols. The activated carbon filter module uses high-surface-area activated carbon as its filter material, mainly removing oil vapor and organic odors. A three-stage filtration scheme is adopted to intercept different pollutants step by step.

[0027] Please see Figures 5-8 The post-filter 6 includes a fixedly installed post-filter cartridge 61 and a second flip cover 62 embedded in the upper end of the post-filter cartridge 61. The post-filter cartridge 61 and the second flip cover 62 are inclined downward from the air inlet to the air outlet. Multiple filter layers 63 embedded in the bottom wall of the inner top wall of the second flip cover 62 are horizontally arranged, and the multiple filter layers 63 are inclined downward towards the air inlet. The post-filter 6 also includes a reverse jet blowing module embedded in the top of the second flip cover 62 and a dust cleaning module installed at the bottom end of the post-filter cartridge 61.

[0028] Both the pre-filter 4 and the post-filter 6 are detachable and feature a parallel dual-filtration mechanism with intelligent valve switching. When cleaning is required, the saturated filter element can be removed from the filter mechanism. For the post-filter 6, a reverse-jet cleaning module and a dust removal module are added, enabling online dust removal without disassembly, as detailed below: The reverse-jet cleaning module includes a reverse-jet box 64 embedded in the top of the flip cover 62. A pulse tube 641 extending outwards is inserted through the reverse-jet box 64. Multiple sets of jet nozzles 642, each corresponding to a filter layer 63, are distributed on the pulse tube 641. The dust removal module includes a dust collection box 65 embedded in the bottom end of the rear filter cartridge 61. A dust removal groove communicating with the dust collection box 65 is opened on the bottom wall of the rear filter cartridge 61. The dust collection box 65 is raised and lowered by an electric push rod 67. There is a dust guide inclined plate 68 connected to the dust removal trough, and a dust discharge pipe 66 is connected to the lower end of the dust collection box 65. During the reverse jet blowing process, the dust guide inclined plate 68 is moved downward by a pair of electric push rods 67. The dust guide inclined plate 68 is separated from the dust removal trough, and clean and dry compressed air is introduced into the pulse pipe 641. It is sprayed in the opposite direction towards the corresponding filter layer 63 through multiple sets of jet nozzles 642. The adsorbent dust falls into the bottom of the dust collection box 65 from the downward inclined dust guide inclined plate 68 and is discharged outward by the dust discharge pipe 66.

[0029] Flow sensors are installed at the inlet of pre-filter 4, the outlet of adsorption tower 1, and the outlet of post-filter 6. Combined with the flow sensor installed in the detection box 5, these sensors detect the gas flow before and after filtration by pre-filter 4, adsorption tower 1, and post-filter 6. This allows for intelligent switching of the dual filtration mechanisms based on changes in gas flow. Specifically, a parallel layout of dual filtration mechanisms and intelligent valve switching are adopted. Relying on differential pressure sensing and control logic, the filtration mechanisms can be automatically switched without stopping. In addition, a backflush circuit is added to post-filter 6 to automatically control valve switching and perform backflush operation based on gas flow and differential pressure signals.

[0030] In summary, this system integrates multi-sensor information acquisition and learning model prediction mechanisms, combining the actual gas load and dew point demand feedback of the dual adsorption towers. This enables dynamic adjustment of the dual tower switching time and regeneration gas flow rate based on actual operating conditions, avoiding the limitations of traditional fixed-mode switching and fixed-flow regeneration. It upgrades the dual-tower adsorption dryer into an intelligent device capable of "sensing-analyzing-decision-execution," ensuring a highly stable gas outlet dew point and avoiding unnecessary frequent switching and over-regeneration of the adsorbent, thus extending its service life. In addition, a fixed parallel layout of dual filtration mechanisms is added to the inlet and outlet of adsorption tower 1, and the gas flow rate before and after filtration by pre-filter 4, adsorption tower 1, and post-filter 6 is detected to facilitate intelligent switching of the dual filtration mechanisms according to changes in gas flow rate. That is, the parallel layout of dual filtration mechanisms and intelligent valve switching are adopted, and the automatic switching of the filtration mechanisms is achieved without stopping the machine by relying on differential pressure sensing and control logic.

[0031] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto; any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A constant dew point heatless desiccant dryer based on dual-tower adsorption, comprising a pair of adsorption towers (1) and a lower piping system (2) installed between the lower ports of the pair of adsorption towers (1) and an upper piping system (3) installed between the upper ports of the pair of adsorption towers (1), characterized in that: The lower piping system (2) is connected to a pair of pre-filters (4) and a detection box (5) that works together at the outlet port of the pre-filters (4). The upper piping system (3) is connected to a pair of post-filters (6). The outlet ports of the pair of post-filters (6) are connected to a main air duct (7). A dew point sensor (8) is installed on the main air duct (7). The detection box (5) is equipped with a gas detection module and a controller. The gas detection module is used to obtain air intake information, including air intake pressure, air intake humidity, air intake temperature and air intake flow. The air intake information is input into a pre-trained and optimized adsorption capacity model to obtain the moisture load rate. The moisture load rate is input into a pre-trained and optimized regeneration gas flow rate regulation model to obtain the regeneration gas regulation flow rate. The controller regulates the regeneration gas flow rate. The dew point sensor (8) detects the gas outlet dew point value in real time and compares the gas outlet dew point value with the preset dew point warning value. When the gas outlet dew point value is greater than or equal to the preset dew point warning value, the controller issues a dual-tower switching command.

2. The constant dew point heatless desiccant dryer based on dual-tower adsorption according to claim 1, characterized in that: The lower piping system (2) includes an air inlet pipe (21) connected to the air inlet of a pair of pre-filters (4) and an air guide pipe (27) connected to the air outlet of a pair of pre-filters (4). An air inlet switching valve (26) is installed on the end of the air inlet pipe (21) near the air inlet of the pre-filters (4). The other end of a pair of air guide pipes (27) is connected to the top of the test box (5). The bottom of the test box (5) is connected to the air inlet of a pair of adsorption towers (1) through an air inlet pipe (22). A switching valve (24) corresponding to each adsorption tower (1) is installed on the air inlet pipe (22). The end of the air inlet pipe (22) adjacent to the air inlet of the adsorption tower (1) is connected to the external exhaust pipe (23) and connected to an external silencer (9). An external exhaust solenoid valve (25) is installed at both ends of the external exhaust pipe (23).

3. The constant dew point heatless desiccant dryer based on dual-tower adsorption according to claim 1, characterized in that: The upper piping system (3) includes an outlet pipe (31) connected between the outlet ends of a pair of adsorption towers (1). Both ends of the outlet pipe (31) are connected to a regeneration conduit (32) with a regulating valve (33). The middle part of the outlet pipe (31) is connected to the air inlet of a pair of post-filters (6) through an exhaust pipe (35). Both ends of the outlet pipe (31) near the exhaust pipe (35) are equipped with outlet switching valves (34). The exhaust pipe (35) is connected to the air inlet of a pair of post-filters (6) with an exhaust switching valve (36). The air outlets of the pair of post-filters (6) are connected to the main air pipe (7) through exhaust branch pipes (37).

4. The constant dew point heatless desiccant dryer based on dual-tower adsorption according to claim 1, characterized in that: The pre-filter (4) includes a pre-filter cartridge (41) and a flip cover (42) installed on the upper half of the pre-filter cartridge (41). The top wall of the flip cover (42) is horizontally distributed with three-stage filter components (43).

5. The constant dew point heatless desiccant dryer based on dual-tower adsorption according to claim 1, characterized in that: The post-filter (6) includes a detachable post-filter cartridge (61) and a flip cover (62). The post-filter cartridge (61) and the flip cover (62) are inclined downward from the air inlet to the air outlet. Multiple filter layers (63) embedded in the bottom wall of the post-filter cartridge (61) are arranged horizontally on the top wall of the flip cover (62), and the multiple filter layers (63) are inclined downward towards the air inlet.

6. The constant dew point heatless adsorption dryer based on dual-tower adsorption according to claim 1, characterized in that: The post-filter (6) also includes a reverse jetting module embedded in the top of the flip cover (62) and a dust removal module installed at the bottom of the post-filter cartridge (61).

7. The constant dew point heatless desiccant dryer based on dual-tower adsorption according to claim 1, characterized in that: The back-blowing module includes a back-blowing box (64) embedded in the top of the flip cover (62), and the back-blowing box (64) is provided with a pulse tube (641) and multiple sets of spray nozzles (642) that correspond one-to-one with the filter layer (63). The dust removal module includes a dust collection box (65), and the bottom wall of the rear filter cartridge (61) is provided with a dust removal groove that is connected to the dust collection box (65). Inside the dust collection box (65), a dust guide inclined plate (68) connected to the dust removal groove is installed by an electric push rod (67). The lower end of the dust collection box (65) is connected to a dust discharge pipe (66).

8. The constant dew point heatless adsorption dryer based on dual-tower adsorption according to claim 1, characterized in that: The inlet of the pre-filter (4), the outlet of the adsorption tower (1), and the outlet of the post-filter (6) are all equipped with flow sensors.

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