Energy-saving regenerative micro-heat adsorption type drying machine

Abstract

The utility model discloses an energy-saving regenerative micro-heat adsorption type drying machine which comprises a base, a nitrogen making unit, a suction drying unit and a heater are installed on the base, the nitrogen making unit is connected with the suction drying unit in parallel, the heater is connected between the nitrogen making unit and the suction drying unit, and an electric cabinet is further installed on the base. A controller is fixedly mounted in the electric control box; according to the utility model, the nitrogen making unit and the suction drying unit are arranged, waste gas discharged by the nitrogen making unit is recycled, and the suction drying unit is purged to regenerate a drying agent of the suction drying unit, so that the purpose of reducing the energy consumption of the whole gas system is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen generators, in particular to an energy-saving regenerative micro-heat adsorption dryer. Background Art

[0002] The principle of the nitrogen generator is to produce nitrogen through the different adsorption amounts of oxygen and nitrogen in the air by the adsorbent (carbon molecular sieve) under different pressures. When the pressure increases, a large amount of oxygen is adsorbed, and the product nitrogen passes through the bed. When the pressure decreases, the adsorption amount of oxygen becomes smaller, and the adsorbed oxygen is desorbed and discharged. The adsorbent is the core part of the nitrogen production equipment. Too much water and oil in the compressed air will cause the adsorption effect of the adsorbent to decline. The dehydration treatment of compressed air generally uses a regenerative micro-heat adsorption dryer. The existing regenerative micro-heat adsorption dryer has a complex pressure equalization structure, cumbersome operation and control, and high energy consumption. In view of the above defects, it is necessary to design an energy-saving regenerative micro-heat adsorption dryer. Utility Model Content

[0003] The purpose of the utility model is to provide an energy-saving regenerative micro-heat adsorption dryer to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an energy-saving regenerative micro-heat adsorption dryer, comprising a base, on which a nitrogen generator, a desiccant unit and a heater are installed, the nitrogen generator and the desiccant unit are connected in parallel, a heater is connected between the nitrogen generator and the desiccant unit, an electric control box is also installed on the base, and a controller is fixedly installed inside the electric control box.

[0005] Preferably, the nitrogen generating unit comprises a first adsorption tower and a second adsorption tower connected in parallel, a first connecting pipe is connected to the top of the first adsorption tower, a second connecting pipe is connected to the top of the second adsorption tower, a first branch pipe and a second branch pipe are connected in parallel between the first connecting pipe and the second connecting pipe, a pressure reducing valve is installed on the first branch pipe, a first exhaust pipe is connected to the second branch pipe, an exhaust valve is installed on the first exhaust pipe, and a first pneumatic valve and a second pneumatic valve are installed on the second branch pipe.

[0006] Preferably, a third connecting pipe is connected to the bottom of the first adsorption tower, a fourth connecting pipe is connected to the bottom of the second adsorption tower, a third branch pipe and a fourth branch pipe are connected in parallel between the third connecting pipe and the fourth connecting pipe, a fifth connecting pipe is connected to the third branch pipe, the fifth connecting pipe is connected to the first muffler, and a third pneumatic valve and a fourth pneumatic valve are installed on the third branch pipe.

[0007] Preferably, the fourth branch pipe is connected to an air intake pipe, an air intake valve is installed on the air intake pipe, a fifth pneumatic valve and a sixth pneumatic valve are installed on the fourth branch pipe, the third connecting pipe is connected to the sixth connecting pipe, the two ends of the sixth connecting pipe are respectively connected to the first adsorption tower and the second adsorption tower, the sixth connecting pipe is also connected to the fourth connecting pipe, and the first pressure equalizing valve and the second pressure equalizing valve are installed on the sixth connecting pipe.

[0008] Preferably, the desiccant unit comprises a first dryer and a second dryer connected in parallel, a seventh connecting pipe is connected to the top of the first dryer, an eighth connecting pipe is connected to the top of the second dryer, a fifth branch pipe and a sixth branch pipe are connected in parallel between the seventh connecting pipe and the eighth connecting pipe, and a first one-way valve and a second one-way valve are installed on the fifth branch pipe.

[0009] Preferably, the fifth branch pipe is connected to a ninth connecting pipe, the ninth connecting pipe is connected to the heater, the ninth connecting pipe is connected to the tenth connecting pipe, the tenth connecting pipe is respectively connected to the seventh branch pipe and the eighth branch pipe, the seventh branch pipe is connected to the third connecting pipe, the seventh branch pipe is installed with a seventh pneumatic valve, the eighth branch pipe is connected to the fourth connecting pipe, and the eighth branch pipe is installed with an eighth pneumatic valve.

[0010] Preferably, a second exhaust pipe is installed on the sixth branch pipe, a ninth pneumatic valve and a tenth pneumatic valve are installed on the sixth branch pipe, an eleventh connecting pipe is connected to the bottom of the first dryer, a twelfth connecting pipe is connected to the bottom of the second dryer, and the ninth branch pipe and the tenth branch pipe are connected in parallel between the eleventh connecting pipe and the twelfth connecting pipe.

[0011] Preferably, the ninth branch pipe is connected to a thirteenth connecting pipe, the thirteenth connecting pipe is connected to the second muffler, the tenth branch pipe is installed with an eleventh pneumatic valve and a twelfth pneumatic valve, the tenth branch pipe is connected to a fourteenth connecting pipe, the fourteenth connecting pipe is connected to the heater, and the tenth branch pipe is installed with a thirteenth pneumatic valve and a fourteenth pneumatic valve.

[0012] Preferably, the heater includes a heating box and a heating tube, an air outlet is fixedly connected to the middle of the lower end of the heating box, the air outlet is connected to the fourteenth connecting tube, an air inlet is fixedly connected to the middle of the upper end of the heating box, the air inlet is connected to the ninth connecting tube, partitions are installed at both ends of the interior of the heating box, a thermal insulation layer is formed between the partition and the heating box, and thermal insulation cotton is arranged inside the thermal insulation layer.

[0013] Preferably, a first current balancing plate is fixedly connected to the upper and lower ends of the partition inside the heating box, and a second current balancing plate is fixedly connected to the side of the heating box close to the first current balancing plate. A plurality of circular holes arranged in a rectangular shape are provided on the surface of the first current balancing plate, and the circular holes penetrate the first current balancing plate. A plurality of rectangular holes are provided on the surface of the second current balancing plate, and the rectangular holes penetrate the second current balancing plate. A heating tube is arranged inside the heating box, and a plurality of heating tubes are arranged in an S shape inside the heating box.

[0014] Compared with the prior art, the utility model is an energy-saving regenerative micro-heat adsorption dryer, which is provided with a nitrogen generator and a desiccant unit, and the waste gas discharged from the nitrogen generator is recovered. The desiccant unit is purged by the waste gas generated by the desorption of the nitrogen generator so that the desiccant of the desiccant unit is regenerated, thereby achieving the purpose of reducing the energy consumption of the entire dryer; the utility model is provided with a heater, and under the action of a first flow equalizing plate and a second flow equalizing plate, the gas is made to flow evenly into the interior of the heating box, so that the gas is evenly heated inside the heating box, thereby ensuring the subsequent treatment process of the air, and at the same time, a plurality of heating tubes are arranged inside the heating box in an S shape, which increases the contact area between the heating tube and the air, thereby improving the heating efficiency, and under the action of the insulation layer and the insulation cotton, reduces the heat loss of the heating box, thereby reducing the operating cost of the heater; the utility model increases the pressure of the second adsorption tower by the nitrogen in the middle of the first adsorption tower, increases the pressure of the first adsorption tower by the nitrogen in the middle of the second adsorption tower, increases the nitrogen to perform the pressure equalization operation of the adsorption tower, thereby improving the purity of the nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a schematic diagram of the front-end structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the rear end structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the internal structure of the heater in the utility model.

[0019] In the attached figure:

[0020] 1. Base; 2. Nitrogen generator; 3. Dryer; 4. Heater; 5. Electric control box; 6. First adsorption tower; 7. Second adsorption tower; 8. Nitrogen generator bracket; 9. First connecting pipe; 10. Second connecting pipe; 11. First branch pipe; 12. Second branch pipe; 13. Pressure reducing valve; 14. First exhaust pipe; 15. Exhaust valve; 16. First pneumatic valve; 17. Second pneumatic valve; 18. Third connecting pipe; 19. Fourth connecting pipe pipe; 20, third branch pipe; 21, fourth branch pipe; 22, fifth connecting pipe; 23, first muffler; 24, third pneumatic valve; 25, fourth pneumatic valve; 26, air intake pipe; 27, air intake valve; 28, fifth pneumatic valve; 29, sixth pneumatic valve; 30, sixth connecting pipe; 31, first equalizing pressure valve; 32, second equalizing pressure valve; 33, first dryer; 34, second dryer; 35, dryer bracket; 36, seventh connecting pipe; 37, the eighth connecting pipe; 38, the fifth branch pipe; 39, the sixth branch pipe; 40, the first one-way valve; 41, the second one-way valve; 42, the ninth connecting pipe; 43, the tenth connecting pipe; 44, the seventh branch pipe; 45, the eighth branch pipe; 46, the seventh pneumatic valve; 47, the eighth pneumatic valve; 48, the ninth pneumatic valve; 49, the tenth pneumatic valve; 50, the eleventh connecting pipe; 51, the twelfth connecting pipe; 52, the ninth branch pipe; 53. The tenth branch pipe; 54. The thirteenth connecting pipe; 55. The second silencer; 56. The eleventh pneumatic valve; 57. The twelfth pneumatic valve; 58. The fourteenth connecting pipe; 59. The thirteenth pneumatic valve; 60. The fourteenth pneumatic valve; 61. The second exhaust pipe; 62. The heating box; 63. The air outlet; 64. The air inlet; 65. The partition; 66. The insulation layer; 67. The first flow equalizing plate; 68. The second flow equalizing plate; 69. The heating pipe. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1-3 As shown, the utility model provides a technical solution: an energy-saving regenerative micro-heat adsorption dryer, comprising a base 1, on which a nitrogen generator 2, a desiccant unit 3 and a heater 4 are installed, the nitrogen generator 2 and the desiccant unit 3 are connected in parallel, and the heater 4 is connected between the nitrogen generator 2 and the desiccant unit 3, and an electric control box 5 is also installed on the base 1, and a controller is fixedly installed inside the electric control box 5, and the controller is connected to an external power supply wire.

[0023] The nitrogen generator unit 2 in this embodiment includes two first adsorption towers 6 and second adsorption towers 7 connected in parallel, the first adsorption tower 6 and the second adsorption tower 7 are both provided with carbon molecular sieves, the first adsorption tower 6 and the second adsorption tower 7 are both installed on the base 1 through the nitrogen generator bracket 8, the top of the first adsorption tower 6 is connected with a first connecting pipe 9, the top of the second adsorption tower 7 is connected with a second connecting pipe 10, the first connecting pipe 9 and the second connecting pipe 10 are connected in parallel with a first branch pipe 11 and a second branch pipe 12, the first branch pipe 11 is installed with a pressure reducing valve 13, and the second branch pipe 12 is installed with a pressure reducing valve 13. A first exhaust pipe 14 is connected to the first adsorption tower 6, an exhaust valve 15 is installed on the first exhaust pipe 14, the first exhaust pipe 14 is connected to the seventh branch pipe 44 and the eighth branch pipe 45 respectively, a first pneumatic valve 16 and a second pneumatic valve 17 are installed on the second branch pipe 12, the first pneumatic valve 16 and the second pneumatic valve 17 are respectively located on both sides of the connection between the first exhaust pipe 14 and the second branch pipe 12, a third connecting pipe 18 is connected to the bottom of the first adsorption tower 6, a fourth connecting pipe 19 is connected to the bottom of the second adsorption tower 7, and the third connecting pipe 18 and the fourth connecting pipe 19 are connected in parallel There are a third branch pipe 20 and a fourth branch pipe 21, the third branch pipe 20 is connected with a fifth connecting pipe 22, the fifth connecting pipe 22 is connected with the first muffler 23, the first muffler 23 is connected with the first dryer 33 and the second dryer 34 through the regeneration air pipe, and a regeneration regulating valve is arranged on the regeneration air pipe. The third branch pipe 20 is installed with a third pneumatic valve 24 and a fourth pneumatic valve 25, the third pneumatic valve 24 and the fourth pneumatic valve 25 are respectively located on both sides of the connection between the fifth connecting pipe 22 and the third branch pipe 20, and the fourth branch pipe 21 is connected with an intake pipe 26. An air intake valve 27 is installed on the pipe 26, and the air intake pipe 26 is connected to the air filter compressor. A fifth pneumatic valve 28 and a sixth pneumatic valve 29 are installed on the fourth branch pipe 21, and the fifth pneumatic valve 28 and the sixth pneumatic valve 29 are respectively located on both sides of the connection between the air intake pipe 26 and the fourth branch pipe 21. The third connecting pipe 18 is connected to the sixth connecting pipe 30, and the two ends of the sixth connecting pipe 30 are respectively connected to the first adsorption tower 6 and the second adsorption tower 7. The sixth connecting pipe 30 is also connected to the fourth connecting pipe 19, and the first equalizing valve 31 and the second equalizing valve 32 are installed on the sixth connecting pipe 30. The waste gas generated by the desorption of the first adsorption tower 6 and the second adsorption tower 7 is introduced into the first dryer 33 and the second dryer 34 through the regeneration air pipe, and the first dryer 33 and the second dryer 34 are purged by the waste gas generated by the desorption of the first adsorption tower 6 and the second adsorption tower 7, so that the desiccant of the first dryer 33 and the second dryer 34 is regenerated, thereby achieving the purpose of reducing the energy consumption of the entire dryer.

[0024] The desiccant unit 3 in this embodiment includes a first desiccant 33 and a second desiccant 34 connected in parallel. The first desiccant 33 and the second desiccant 34 are both mounted on the base 1 through a desiccant bracket 35. A seventh connecting pipe 36 is connected to the top of the first desiccant 33, and an eighth connecting pipe 37 is connected to the top of the second desiccant 34. A fifth branch pipe 38 and a sixth branch pipe 39 are connected in parallel between the seventh connecting pipe 36 and the eighth connecting pipe 37. A first check valve 40 and a second check valve 41 are mounted on the fifth branch pipe 38. A ninth connecting pipe 42 is connected to the upper side, a first one-way valve 40 and a second one-way valve 41 are respectively located on both sides of the connection between the fifth branch pipe 38 and the ninth connecting pipe 42, the ninth connecting pipe 42 is connected to the heater 4, the ninth connecting pipe 42 is connected to the tenth connecting pipe 43, the tenth connecting pipe 43 is respectively connected to the seventh branch pipe 44 and the eighth branch pipe 45, the seventh branch pipe 44 is connected to the third connecting pipe 18, a seventh pneumatic valve 46 is installed on the seventh branch pipe 44, the eighth branch pipe 45 is connected to the fourth connecting pipe 19, and an eighth pneumatic valve 47 is installed on the eighth branch pipe 45.

[0025] The sixth branch pipe 39 in this embodiment is provided with a second exhaust pipe 61, which is connected to a buffer tank. The sixth branch pipe 39 is provided with a ninth pneumatic valve 48 and a tenth pneumatic valve 49, which are respectively located on both sides of the connection between the second exhaust pipe 61 and the sixth branch pipe 39. The bottom of the first dryer 33 is connected with an eleventh connecting pipe 50, the bottom of the second dryer 34 is connected with a twelfth connecting pipe 51, the eleventh connecting pipe 50 and the twelfth connecting pipe 51 are connected in parallel with a ninth branch pipe 52 and a tenth branch pipe 53, and the ninth branch pipe 52 is connected with a thirteenth connecting pipe 51. The connecting pipe 54 is connected to the second muffler 55, the tenth branch pipe 53 is equipped with an eleventh pneumatic valve 56 and a twelfth pneumatic valve 57, the eleventh pneumatic valve 56 and the twelfth pneumatic valve 57 are respectively located on both sides of the connection between the ninth branch pipe 52 and the thirteenth connecting pipe 54, the tenth branch pipe 53 is connected with a fourteenth connecting pipe 58, the fourteenth connecting pipe 58 is connected to the heater 4, the tenth branch pipe 53 is equipped with a thirteenth pneumatic valve 59 and a fourteenth pneumatic valve 60, the thirteenth pneumatic valve 59 and the fourteenth pneumatic valve 60 are respectively located on both sides of the connection between the tenth branch pipe 53 and the fourteenth connecting pipe 58.

[0026] The heater 4 in this embodiment includes a heating box 62 and a heating tube 69. An air outlet 63 is fixedly connected to the middle of the lower end of the heating box 62. The air outlet 63 is connected to the fourteenth connecting tube 58. An air inlet 64 is fixedly connected to the middle of the upper end of the heating box 62. The air inlet 64 is connected to the ninth connecting tube 42. Partitions 65 are installed at both ends of the interior of the heating box 62. A heat-insulating layer 66 is formed between the partition 65 and the heating box 62. Heat-insulating cotton is arranged inside the heat-insulating layer 66. The interior of the heating box 62 is located at both upper and lower ends of the partition 65. A first current balancing plate 67 is fixedly connected, and a second current balancing plate 68 is fixedly connected to one side of the interior of the heating box 62 close to the first current balancing plate 67. A plurality of circular holes arranged in a rectangular shape are provided on the surface of the first current balancing plate 67, and the circular holes penetrate the first current balancing plate 67. A plurality of rectangular holes arranged equidistantly are provided on the surface of the second current balancing plate 68, and the rectangular holes penetrate the second current balancing plate 68. A heating tube 69 is provided inside the heating box 62, and a plurality of heating tubes 69 are provided. The plurality of heating tubes 69 are arranged in an S shape inside the heating box 62.

[0027] The working principle and use process of this utility model:

[0028] When in use, air passes through the air filter compressor, which is used to filter moisture, impurities, etc. in the compressed air, and enters the first adsorption tower 6 through the air intake pipe 26, the fourth branch pipe 21 and the third connecting pipe 18. The carbon molecular sieve in the first adsorption tower 6 adsorbs oxygen molecules, water, carbon dioxide and other components in the compressed air. The oxygen adsorbed by the carbon molecular sieve enters the first muffler 23 through the third connecting pipe 18, the third branch pipe 20 and the fifth connecting pipe 22, and is discharged to the outside through the first muffler 23. The unadsorbed air enters the top of the inner side of the first adsorption tower 6, and enters the heater 4 through the first connecting pipe 9, the first exhaust pipe 14 and the seventh branch pipe 44; the compressed air enters the second adsorption tower 7 through the air intake pipe 26, the fourth branch pipe 21 and the fourth connecting pipe 19. The carbon molecular sieve in the second adsorption tower 7 adsorbs oxygen molecules, water, carbon dioxide and other components in the compressed air. The oxygen adsorbed by the carbon molecular sieve passes through the fourth connecting pipe 18, the third branch pipe 20 and the fifth connecting pipe 22, and is discharged to the outside through the first muffler 23. The unadsorbed air enters the top of the inner side of the first adsorption tower 6, and enters the heater 4 through the first connecting pipe 9, the first exhaust pipe 14 and the seventh branch pipe 44. 19. The third branch pipe 20 and the fifth connecting pipe 22 enter the first muffler 23 and are discharged to the outside through the first muffler 23. The unabsorbed gas enters the inner top of the second adsorption tower 7 and enters the heater 4 through the second connecting pipe 10, the first exhaust pipe 14, the eighth branch pipe 45, the tenth connecting pipe 43 and the ninth connecting pipe 42. The gas entering the heater 4 flows evenly into the interior of the heating box 62 under the action of the first flow equalizing plate 67 and the second flow equalizing plate 68, so that the gas is evenly heated inside the heating box 62, thereby ensuring the subsequent processing steps of the gas. At the same time, a plurality of heating tubes 69 are arranged inside the heating box 62 in an S shape, and the contact area between the heating tubes 69 and the gas is increased, thereby improving the heating efficiency. Under the action of the insulation layer 66 and the insulation cotton, the heat loss of the heating box 62 is reduced, thereby reducing the operating cost of the heater 4.

[0029] The heated gas enters the first dryer 33 through the fourteenth connecting pipe 58, the tenth branch pipe 53 and the eleventh connecting pipe 50. The air coming out of the first dryer 33 enters the buffer tank through the seventh connecting pipe 36, the sixth branch pipe 39 and the second exhaust pipe 61 for output use. At the same time, the exhaust gas from the first dryer 33 enters the heater 4 as the regeneration gas through the fifth branch pipe 38 and the ninth connecting pipe 42. After heating, it enters the second dryer 34 for purging and regeneration through the fourteenth connecting pipe 58 and the twelfth connecting pipe 51. The regeneration heater 4 heats up the regeneration gas for part of the time before the regeneration work, so as to facilitate the desorption and dehydration of the bed layer of the second dryer 34. The regeneration heater 4 stops working for part of the time, and the regeneration gas cools the bed layer of the second dryer 34. The purged gas enters the second muffler 55 for venting through the twelfth connecting pipe 51, the ninth branch pipe 52 and the thirteenth connecting pipe 54. The air after entering the second dryer 34, the air coming out of the second dryer 34 enters the buffer tank through the eighth connecting pipe 37, the sixth branch pipe 39 and the second exhaust pipe 61 for output use, the vented waste gas from the second dryer 34 enters the heater 4 through the fifth branch pipe 38 and the ninth connecting pipe 42 as the regeneration gas, and enters the first dryer 33 through the fourteenth connecting pipe 58, the tenth branch pipe 53 and the eleventh connecting pipe 50 after heating for purging and regeneration. The regeneration heater 4 heats the regeneration gas for part of the time before the regeneration work, so as to heat up the regeneration gas, so as to facilitate the desorption and dehydration of the bed layer of the first dryer 33, and the regeneration heater 4 stops working for part of the time after the regeneration work, and the regeneration gas cools the bed layer of the first dryer 33, and the purged gas enters the second muffler 55 through the eleventh connecting pipe 50, the ninth branch pipe 52 and the thirteenth connecting pipe 54 for discharge; the first dryer 33 and the second dryer 34 alternately perform the above-mentioned cycle process.

[0030] In the utility model, the nitrogen in the middle of the first adsorption tower 6 is reversed from the sixth connecting pipe 30 and enters the second adsorption tower 7 through the fourth connecting pipe 19 to increase the pressure of the second adsorption tower 7. The pressure of the second adsorption tower 7 is increased by the nitrogen in the middle of the first adsorption tower 6, thereby improving the purity of the nitrogen. The nitrogen in the middle of the second adsorption tower 7 is reversed from the sixth connecting pipe 30 and enters the first adsorption tower 6 through the third connecting pipe 18 to increase the pressure of the first adsorption tower 6.

[0031] Although the 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An energy-saving regenerative micro-heat adsorption dryer, characterized in that: The invention comprises a base (1), on which a nitrogen generator (2), a desiccant unit (3) and a heater (4) are mounted, wherein the nitrogen generator (2) and the desiccant unit (3) are connected in parallel, and the heater (4) is connected between the nitrogen generator (2) and the desiccant unit (3). An electric control box (5) is also mounted on the base (1), and a controller is fixedly mounted inside the electric control box (5).

2. The energy-saving regenerative micro-heat adsorption dryer according to claim 1, characterized in that: The nitrogen generator (2) comprises a first adsorption tower (6) and a second adsorption tower (7) connected in parallel, the top of the first adsorption tower (6) is connected to a first connecting pipe (9), the top of the second adsorption tower (7) is connected to a second connecting pipe (10), a first branch pipe (11) and a second branch pipe (12) are connected in parallel between the first connecting pipe (9) and the second connecting pipe (10), a pressure reducing valve (13) is installed on the first branch pipe (11), a first exhaust pipe (14) is connected to the second branch pipe (12), an exhaust valve (15) is installed on the first exhaust pipe (14), and a first pneumatic valve (16) and a second pneumatic valve (17) are installed on the second branch pipe (12).

3. The energy-saving regenerative micro-heat adsorption dryer according to claim 2 is characterized in that: The bottom of the first adsorption tower (6) is connected to a third connecting pipe (18), the bottom of the second adsorption tower (7) is connected to a fourth connecting pipe (19), a third branch pipe (20) and a fourth branch pipe (21) are connected in parallel between the third connecting pipe (18) and the fourth connecting pipe (19), a fifth connecting pipe (22) is connected to the third branch pipe (20), the fifth connecting pipe (22) is connected to the first muffler (23), and a third pneumatic valve (24) and a fourth pneumatic valve (25) are installed on the third branch pipe (20).

4. The energy-saving regenerative micro-heat adsorption dryer according to claim 3, characterized in that: The fourth branch pipe (21) is connected to an air intake pipe (26), and an air intake valve (27) is installed on the air intake pipe (26). The fourth branch pipe (21) is installed with a fifth pneumatic valve (28) and a sixth pneumatic valve (29). The third connecting pipe (18) is connected to the sixth connecting pipe (30), and the two ends of the sixth connecting pipe (30) are respectively connected to the first adsorption tower (6) and the second adsorption tower (7). The sixth connecting pipe (30) is also connected to the fourth connecting pipe (19). The sixth connecting pipe (30) is installed with a first pressure equalizing valve (31) and a second pressure equalizing valve (32).

5. The energy-saving regenerative micro-heat adsorption dryer according to claim 1, characterized in that: The desiccant unit (3) comprises a first dryer (33) and a second dryer (34) which are connected in parallel. A seventh connecting pipe (36) is connected to the top of the first dryer (33), and an eighth connecting pipe (37) is connected to the top of the second dryer (34). A fifth branch pipe (38) and a sixth branch pipe (39) are connected in parallel between the seventh connecting pipe (36) and the eighth connecting pipe (37). A first check valve (40) and a second check valve (41) are installed on the fifth branch pipe (38).

6. The energy-saving regenerative micro-heat adsorption dryer according to claim 5, characterized in that: The fifth branch pipe (38) is connected to a ninth connecting pipe (42), the ninth connecting pipe (42) is connected to the heater (4), the ninth connecting pipe (42) is connected to the tenth connecting pipe (43), the tenth connecting pipe (43) is respectively connected to the seventh branch pipe (44) and the eighth branch pipe (45), the seventh branch pipe (44) is connected to the third connecting pipe (18), the seventh branch pipe (44) is installed with a seventh pneumatic valve (46), the eighth branch pipe (45) is connected to the fourth connecting pipe (19), and the eighth branch pipe (45) is installed with an eighth pneumatic valve (47).

7. The energy-saving regenerative micro-heat adsorption dryer according to claim 5, characterized in that: The sixth branch pipe (39) is provided with a second exhaust pipe (61), the sixth branch pipe (39) is provided with a ninth pneumatic valve (48) and a tenth pneumatic valve (49), the bottom of the first dryer (33) is connected with an eleventh connecting pipe (50), the bottom of the second dryer (34) is connected with a twelfth connecting pipe (51), and the ninth branch pipe (52) and the tenth branch pipe (53) are connected in parallel between the eleventh connecting pipe (50) and the twelfth connecting pipe (51).

8. The energy-saving regenerative micro-heat adsorption dryer according to claim 7, characterized in that: The ninth branch pipe (52) is connected to a thirteenth connecting pipe (54), which is in communication with the second muffler (55); the tenth branch pipe (53) is provided with an eleventh pneumatic valve (56) and a twelfth pneumatic valve (57); the tenth branch pipe (53) is connected to a fourteenth connecting pipe (58), which is connected to the heater (4); the tenth branch pipe (53) is provided with a thirteenth pneumatic valve (59) and a fourteenth pneumatic valve (60).

9. The energy-saving regenerative micro-heat adsorption dryer according to claim 1, characterized in that: The heater (4) comprises a heating box (62) and a heating tube (69); an air outlet (63) is fixedly connected to the middle of the lower end of the heating box (62); the air outlet (63) is connected to the fourteenth connecting tube (58); an air inlet (64) is fixedly connected to the middle of the upper end of the heating box (62); the air inlet (64) is connected to the ninth connecting tube (42); partitions (65) are installed at both ends of the interior of the heating box (62); a heat-insulating layer (66) is formed between the partition (65) and the heating box (62); and heat-insulating cotton is arranged inside the heat-insulating layer (66).

10. The energy-saving regenerative micro-heat adsorption dryer according to claim 9, characterized in that: The interior of the heating box (62) is fixedly connected to a first flow equalizing plate (67) at both upper and lower ends of the partition (65); the interior of the heating box (62) is fixedly connected to a second flow equalizing plate (68) on one side close to the first flow equalizing plate (67); the surface of the first flow equalizing plate (67) is provided with a plurality of circular holes arranged in a rectangular shape, and the circular holes penetrate the first flow equalizing plate (67); the surface of the second flow equalizing plate (68) is provided with a plurality of rectangular holes arranged at equal intervals, and the rectangular holes penetrate the second flow equalizing plate (68); a heating tube (69) is arranged inside the heating box (62); a plurality of heating tubes (69) are arranged, and the plurality of heating tubes (69) are arranged in an S shape inside the heating box (62).

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