Zero-gas-consumption combined drying machine

Abstract

A zero-gas-consumption combined dryer comprises a tower A, a tower B, a refrigeration dryer heat exchanger and a regenerated gas cooling heat exchanger, and the refrigeration dryer heat exchanger is connected with a second pipeline and a third pipeline through a first pipeline. A fourth pipeline between the second pipeline and the third pipeline is connected with a regeneration gas cooling heat exchanger through a fifth pipeline, and the regeneration gas cooling heat exchanger is connected with the first pipeline; the tower A and the tower B are respectively connected with a compressed air outlet pipe through a sixth pipeline and a seventh pipeline; an eighth pipeline is arranged between the sixth pipeline and the seventh pipeline and is connected with the electric heater through a ninth pipeline; the compressed air outlet pipe is connected with the regeneration gas-compressed hot air heat exchanger through a heat exchange pipeline, and the regeneration gas-compressed hot air heat exchanger is connected with the electric heater through a tenth pipeline. According to the invention, the defects in the prior art are overcome, zero emission of regenerated gas can be realized, the heat demand for desorption regeneration of the adsorbent is effectively reduced, the electric heating energy consumption is reduced, and the purpose of saving energy is achieved.

Description

Technical Field

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

[0002] Existing dryers are usually divided into heat adsorption dryers and heatless adsorption dryers. In order to achieve uninterrupted gas supply to downstream gas-consuming equipment, almost all adsorption drying devices are designed as a double-tower structure. When one tower is performing adsorption operation, the other tower is regenerating the adsorbent at the same time. After a certain period of time, the double-tower working conditions are automatically switched. The interval from the start of adsorption operation of a tower, through regeneration, pressure equalization and other processes, to the start of the next adsorption operation is called the working cycle of the drying device.

[0003] The existing adsorption dryer is generally used in conjunction with an air compressor to dry compressed air containing moisture, but the existing technical solutions all have the problem of consuming a large amount of compressed air, resulting in waste. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a zero-gas consumption combined dryer, which overcomes the shortcomings of the prior art and has a reasonable design. It can achieve zero emission of regenerated gas and effectively reduce the heat demand for adsorbent desorption regeneration and reduce the energy consumption of electric heating, thereby achieving the purpose of energy saving.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A zero-gas-consumption combined dryer comprises a tower A, a tower B, a cold dryer heat exchanger, a regeneration gas cooling heat exchanger and a regeneration gas-compressed hot air heat exchanger, wherein the air inlet of the cold dryer heat exchanger is connected to a compressed air inlet pipe, the air outlet of the cold dryer heat exchanger is connected to one end of a first pipeline, the other end of the first pipeline is respectively connected to one end of a second pipeline and one end of a third pipeline through a tee, the other end of the second pipeline is connected to the lower end of the tower A, the third pipeline is connected to the lower end of the tower B, and the second pipeline and the third pipeline are respectively installed with a first valve and a second valve at one end of the tee; a fourth pipeline is fixedly connected between the second pipeline and the third pipeline, a third valve and a fourth valve are respectively installed on the fourth pipeline, one end of a fifth pipeline is fixedly connected between the third valve and the fourth valve, the other end of the fifth pipeline is connected to the air inlet of the regeneration gas cooling heat exchanger, and the air outlet of the regeneration gas cooling heat exchanger is connected to the first pipeline;

[0007] The upper ends of the A tower and the B tower are connected to one end of the sixth pipeline and the seventh pipeline respectively, the other ends of the sixth pipeline and the seventh pipeline are respectively installed with a fifth valve and a sixth valve, and the other ends of the sixth pipeline and the seventh pipeline are connected to a compressed air outlet pipe through a tee; the eighth pipeline is fixedly connected with the sixth pipeline and the seventh pipeline, the seventh valve and the eighth valve are respectively installed on the eighth pipeline, one end of the ninth pipeline is fixedly connected between the seventh valve and the eighth valve, and the other end of the ninth pipeline is connected to the outlet end of the electric heater;

[0008] The compressed air outlet pipe is connected to one end of the heat exchange pipeline, and the other end of the heat exchange pipeline is connected to the first inlet end of the regeneration gas-compressed hot air heat exchanger. The first outlet end of the regeneration gas-compressed hot air heat exchanger is connected to the inlet end of the electric heater through the tenth pipeline, and the second inlet end of the regeneration gas-compressed hot air heat exchanger is connected to the hot air output pipeline generated by the air compressor.

[0009] Preferably, the eighth pipeline is connected to one end of the eleventh pipeline and one end of the twelfth pipeline respectively, the eleventh pipeline is located between the seventh valve and the ninth pipeline, the twelfth pipeline is located between the eighth valve and the ninth pipeline, the other end of the eleventh pipeline is connected to the middle position of Tower A, the other end of the twelfth pipeline is connected to the middle position of Tower B, and the eleventh valve and the twelfth valve are installed on the eleventh pipeline and the twelfth pipeline respectively.

[0010] Preferably, the refrigerant inlet and refrigerant outlet of the cold dryer heat exchanger are respectively connected to the outlet and inlet of the first refrigeration device; the refrigerant inlet and refrigerant outlet of the regeneration gas cooling heat exchanger are respectively connected to the outlet and inlet of the second refrigeration device.

[0011] Preferably, a booster pump is installed on the heat exchange pipeline.

[0012] Preferably, a thirteenth pipeline is connected between the heat exchange pipeline and the tenth pipeline, a ninth valve is installed on the thirteenth pipeline, and a tenth valve is installed at the first inlet end of the regenerated gas-compressed hot air heat exchanger.

[0013] The present invention provides a zero-gas-consumption combined dryer. It has the following beneficial effects: by using a booster pump as a reflux device for the regeneration airflow, part of the outlet air can be used as the regeneration airflow to desorb the adsorbent in the drying tower; and the regeneration airflow circulates inside the entire combined dryer and is not discharged to the outside, thereby achieving zero emission of regeneration gas. In addition, by using a regeneration air cooling heat exchanger to cool the regeneration airflow, the water content in the regeneration airflow can be effectively reduced, so that it can be mixed with the adsorption airflow and then flow into the drying tower for adsorption, which can effectively reduce the heat demand for adsorbent desorption regeneration, reduce the energy consumption of electric heating, and achieve the purpose of energy saving.

[0014] By arranging regeneration airflow interfaces at the middle positions of towers A and B to connect to the eleventh pipeline and the twelfth pipeline respectively, the regeneration heating airflow can bypass the upper part of the drying tower through the eleventh pipeline, the eleventh valve, the twelfth pipeline and the twelfth valve. The regeneration heating airflow can preheat the adsorbent in the lower part of the drying tower. Thus, the temperature of the adsorbent at the bottom of tower A and / or tower B can be quickly increased, which is conducive to more effectively regenerating the moisture adsorbed in the desorbent adsorbent and reducing the presence of residual moisture in the adsorbent in the lower part of the drying tower.

[0015] By using the regeneration gas-compressed hot air heat exchanger as the regeneration airflow preheating device, when equipped with an oil-injected screw air compressor, the low-temperature compressed hot air at the air compressor outlet can be effectively used as a heat source to preheat the regeneration airflow, and the insufficient heat is provided by the electric heater, which can effectively reduce the regeneration heating energy consumption. When equipped with a centrifugal air compressor or an oil-free screw air compressor, the electric heater can be turned off, so that the regeneration gas-compressed hot air heat exchanger is directly used as a regeneration airflow heating device, so as to effectively use the high-temperature compressed hot air at the air compressor outlet as a heat source to directly heat the regeneration airflow, completely saving the energy consumption of the electric heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings required for describing the prior art are briefly introduced below.

[0017] Figure 1 A schematic diagram of the structure of the present invention;

[0018] Figure 2 Schematic diagram of airflow control in the regeneration preheating state of the present invention;

[0019] Figure 3 Schematic diagram of airflow control in the regeneration heating state of the present invention;

[0020] Figure 4 Schematic diagram of airflow control in the waiting state of the present invention;

[0021] Figure 5 Schematic diagram of airflow control when the two towers are in parallel state according to the present invention;

[0022] Figure 6 Schematic diagram of airflow control in cooling state of the present invention;

[0023] Description of the numbers in the figure:

[0024] 1. Tower A; 2. Tower B; 3. Cold dryer heat exchanger; 4. Regeneration gas cooling heat exchanger; 5. Regeneration gas-compressed hot air heat exchanger; 6. Compressed air inlet pipe; 7. First pipeline; 8. Second pipeline; 9. Third pipeline; 10. First valve; 11. Second valve; 12. Fourth pipeline; 13. Third valve; 14. Fourth valve; 15. Fifth pipeline; 16. Sixth pipeline; 17. Seventh pipeline; 18. Fifth valve; 19. Sixth valve; 20. Compressed air outlet pipe; 21. Eighth pipeline; 22. Seventh valve; 23. Eighth valve; 24. Ninth pipeline; 25. Electric heater; 26. Heat exchange pipeline; 27. Tenth pipeline; 29. ​​Eleventh pipeline; 30. Twelfth pipeline; 31. First refrigeration device; 32. Second refrigeration device; 33. Booster pump; 34. Thirteenth pipeline; 35. Ninth valve; 36. Tenth valve. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0026] Embodiment 1, as Figure 1-6 As shown, a zero-gas consumption combined dryer comprises a tower A 1, a tower B 2, a cold dryer heat exchanger 3, a regeneration gas cooling heat exchanger 4 and a regeneration gas-compressed hot air heat exchanger 5, the air inlet of the cold dryer heat exchanger 3 is connected to a compressed air inlet pipe 6, the air outlet of the cold dryer heat exchanger 3 is connected to one end of a first pipeline 7, the other end of the first pipeline 7 is respectively connected to one end of a second pipeline 8 and one end of a third pipeline 9 through a tee, the other end of the second pipeline 8 is connected to the lower end of the tower A 1, and the third pipeline 9 is connected to the lower end of the tower B 2. The ends of the second pipeline 8 and the third pipeline 9 near the tee are respectively installed with a first valve 10 and a second valve 11; the second pipeline 8 and the third pipeline 9 are fixedly connected with a fourth pipeline 12, and the third valve 13 and the fourth valve 14 are respectively installed on the fourth pipeline 12, and one end of the fifth pipeline 15 is fixedly connected between the third valve 13 and the fourth valve 14, and the other end of the fifth pipeline 15 is connected to the air inlet of the regeneration gas cooling heat exchanger 4, and the air outlet of the regeneration gas cooling heat exchanger 4 is connected to the first pipeline 7;

[0027] The upper ends of the A tower 1 and the B tower 2 are respectively connected to one end of the sixth pipeline 16 and the seventh pipeline 17, the other ends of the sixth pipeline 16 and the seventh pipeline 17 are respectively installed with a fifth valve 18 and a sixth valve 19, and the other ends of the sixth pipeline 16 and the seventh pipeline 17 are connected to a compressed air outlet pipe 20 through a tee; an eighth pipeline 21 is fixedly connected between the sixth pipeline 16 and the seventh pipeline 17, and a seventh valve 22 and an eighth valve 23 are respectively installed on the eighth pipeline 21, one end of a ninth pipeline 24 is fixedly connected between the seventh valve 22 and the eighth valve 23, and the other end of the ninth pipeline 24 is connected to the outlet end of the electric heater 25;

[0028] The compressed air outlet pipe 20 is connected to one end of the heat exchange pipeline 26, and the other end of the heat exchange pipeline 26 is connected to the first inlet end of the regeneration gas-compressed hot air heat exchanger 5. The first outlet end of the regeneration gas-compressed hot air heat exchanger 5 is connected to the inlet end of the electric heater 25 through the tenth pipeline 27, and the second inlet end of the regeneration gas-compressed hot air heat exchanger 5 is connected to the hot air output pipeline generated by the air compressor. A booster pump 33 is installed on the heat exchange pipeline 26.

[0029] In addition, the eighth pipeline 21 is respectively connected to one end of the eleventh pipeline 29 and one end of the twelfth pipeline 30, the eleventh pipeline 29 is located between the seventh valve 22 and the ninth pipeline 24, the twelfth pipeline 30 is located between the eighth valve 23 and the ninth pipeline 24, the other end of the eleventh pipeline 29 is connected to the middle position of the A tower 1, the other end of the twelfth pipeline 30 is connected to the middle position of the B tower 2, and the eleventh valve 37 and the twelfth valve 38 are respectively installed on the eleventh pipeline 29 and the twelfth pipeline 30.

[0030] Working principle:

[0031] Working condition 1: in the adsorption state; at this time, the first valve 10, the fourth valve 14, the fifth valve 18, the seventh valve 22 and the eighth valve 23 are closed, and the second valve 11 and the sixth valve 19 are opened;

[0032] The working process is as follows: compressed air is first input into the cold dryer heat exchanger 3 from the compressed air inlet pipe 6, and the compressed air is cooled by the cold dryer heat exchanger 3. The cooled air then flows through the first pipeline 7, the second valve 11 and the third pipeline 9, and enters the B tower 2 from the bottom of the B tower 2 for adsorption drying. The dried air flows out after passing through the seventh pipeline 17, the sixth valve 19 and the compressed air outlet pipe 20 in sequence, thereby completing the operation of the adsorption airflow.

[0033] Condition 2: If Figure 2As shown, the regeneration preheating state; at this time, the first valve 10, the fourth valve 14, the fifth valve 18, the seventh valve 22, the eighth valve 23 and the twelfth valve 38 are closed; the second valve 11, the third valve 13, the sixth valve 19 and the eleventh valve 37 are opened, and the booster pump 33 is started;

[0034] The working process is as follows: the compressed air input from the compressed air inlet pipe 6 is first adsorbed and dried according to the process described in working condition 1, and then a part of the outlet air is separated from the compressed air outlet pipe 20 as the regeneration air flow. After the separated regeneration air flow is pressurized by the booster pump 33, it flows through the heat exchange pipeline 26 and enters the regeneration air-compressed hot air heat exchanger 5 from the first inlet end of the regeneration air-compressed hot air heat exchanger 5, so that the separated air is first pre-heated by the hot air generated by the operation of the air compressor in the regeneration air-compressed hot air heat exchanger 5, and then flows from the first outlet end of the regeneration air-compressed hot air heat exchanger 5 through the tenth pipeline 27, and then flows into the electric heater 25 for further heating. After the heated regeneration heating air flow flows out from the outlet end of the electric heater 25, it flows through the ninth pipeline 24, the eleventh pipeline 29 and the eleventh valve 37 in sequence, and then enters the A tower 1 from the middle of the A tower 1, so that the adsorbent in the lower half of the A tower 1 can be heated and desorbed by the regeneration heating air flow. Afterwards, the regenerated heating air flow carries the desorbed moisture and flows out from the bottom of tower A 1, and flows through the second pipeline 8, the fourth pipeline 12, the third valve 13 and the fifth pipeline 15 in sequence, and then enters the regenerated gas cooling heat exchanger 4 from the air inlet of the regenerated gas cooling heat exchanger 4, so that the regenerated heating air flow is cooled by the cooling capacity provided by the refrigerant circulating in the regenerated gas cooling heat exchanger 4 to condense the desorbed moisture carried and flow out; and the cooled regenerated air flow flows into the first pipeline 7 from the air outlet of the regenerated gas cooling heat exchanger 4, and then mixes with the compressed air flowing out from the air outlet of the cold dryer heat exchanger 3, thereby completing the internal circulation of the regenerated air flow.

[0035] Condition 3: If Figure 3 As shown, the regeneration heating state; at this time, the first valve 10, the fourth valve 14, the fifth valve 18, the eighth valve 23, the eleventh valve 37 and the twelfth valve 38 are closed; the second valve 11, the third valve 13, the sixth valve 19 and the seventh valve 22 are opened, and the booster pump 33 is started;

[0036] The working process is as follows: the compressed air input from the compressed air inlet pipe 6 is first adsorbed and dried according to the process described in working condition 1, and then a part of the outlet air is separated from the compressed air outlet pipe 20 as the regeneration air flow. After the separated regeneration air flow is pressurized by the booster pump 33, it flows through the heat exchange pipeline 26 and enters the regeneration air-compressed hot air heat exchanger 5 from the first inlet end of the regeneration air-compressed hot air heat exchanger 5, so that the separated air is pre-heated by the hot air generated by the operation of the air compressor in the regeneration air-compressed hot air heat exchanger 5, and then flows from the first outlet end of the regeneration air-compressed hot air heat exchanger 5 through the tenth pipeline 27, and then flows into the electric heater 25 for further heating. After the heated regeneration heating air flow flows out from the outlet end of the electric heater 25, it flows through the ninth pipeline 24, the eighth pipeline 21, the seventh valve 22 and the sixth pipeline 16 in sequence, and then enters the A tower 1 from the upper part of the A tower 1, so that all the adsorbents in the A tower 1 can be heated and desorbed by the regeneration heating air flow. Afterwards, the regenerated heating air flow carries the desorbed moisture and flows out from the bottom of tower A 1, and flows through the second pipeline 8, the fourth pipeline 12, the third valve 13 and the fifth pipeline 15 in sequence, and then enters the regenerated gas cooling heat exchanger 4 from the air inlet of the regenerated gas cooling heat exchanger 4, so that the regenerated heating air flow is cooled by the cooling capacity provided by the refrigerant circulating in the regenerated gas cooling heat exchanger 4 to condense the desorbed moisture carried and flow out; and the cooled regenerated air flow flows into the first pipeline 7 from the air outlet of the regenerated gas cooling heat exchanger 4, and then mixes with the compressed air flowing out from the air outlet of the cold dryer heat exchanger 3, thereby completing the internal circulation of the regenerated air flow.

[0037] Condition 4: If Figure 4 As shown, it is in a waiting state; at this time, the adsorption gas flow operates in the operating mode of operating condition 1. In this state, the first valve 10, the third valve 13, the fourth valve 14, the seventh valve 22, the eighth valve 23, the eleventh valve 37 and the twelfth valve 38 are closed; the second valve 11, the fifth valve 18 and the sixth valve 19 are opened; the booster pump 33 is turned off and running; at this time, tower A 1 is in a waiting state.

[0038] The above working conditions 1 to 4 are single-tower processes for compressed air. When the working states of tower A 1 and tower B 2 need to be switched, it is only necessary to switch the opening and closing states of the first valve 10, the second valve 11, the third valve 13, the fourth valve 14, the fifth valve 18, the sixth valve 19, the seventh valve 22, the eighth valve 23, the eleventh valve 37 and the twelfth valve 38 in the initial state; tower A 1 can be converted into an adsorption tower operation. Its operating principle is the same as the above operating process, so it will not be repeated.

[0039] Condition 5: If Figure 5As shown, the double towers are in parallel state; at this time, the third valve 13, the fourth valve 14, the seventh valve 22, the eighth valve 23, the eleventh valve 37 and the twelfth valve 38 are closed; the first valve 10, the second valve 11, the fifth valve 18 and the sixth valve 19 are opened, and the booster pump 33 is closed; at this time, the compressed air input from the compressed air inlet pipe 6 is cooled by the cold dryer heat exchanger 3, and then flows through the first pipeline 7, and then flows through the second pipeline 8 and the third pipeline 9, so that the cooled compressed air flows into the A tower 1 and the B tower 2 from the bottom of the A tower 1 and the B tower 2 at the same time, so as to adsorb and dry the A tower 1 and the B tower 2 at the same time, and the dried air flows to the compressed air outlet pipe 20 through the sixth pipeline 16 and the seventh pipeline 17 respectively, and then flows out after passing through the compressed air outlet pipe 20, thereby completing the operation of the simultaneous adsorption of the airflow by the A tower 1 and the B tower 2.

[0040] The present invention uses a booster pump 33 as a reflux device for the regeneration airflow, so that part of the outlet air can be used as a regeneration airflow to desorb the adsorbent in the drying tower; and the regeneration airflow circulates inside the entire combined dryer and is not discharged to the outside, thereby achieving zero emission of regeneration gas. In addition, by using a regeneration air cooling heat exchanger 4 to cool the regeneration airflow, the water content in the regeneration airflow can be effectively reduced, so that it can be mixed with the adsorption airflow and flow into the drying tower for adsorption, which can effectively reduce the heat demand for adsorbent desorption regeneration, reduce the energy consumption of electric heating, and achieve the purpose of energy saving.

[0041] In addition, the present invention provides a regeneration airflow interface at the middle position of the A tower 1 and the B tower 2 to connect to the eleventh pipeline 29 and the twelfth pipeline 30 respectively, so that in the working condition 2, the regeneration heating airflow can pass through the eleventh pipeline 29, the eleventh valve 37, the twelfth pipeline 30 and the twelfth valve 38 to bypass the upper part of the drying tower. The regeneration heating airflow can preheat the adsorbent in the lower part of the drying tower. Thereby, the temperature of the adsorbent at the bottom of the A tower 1 and / or the B tower 2 can be quickly increased, which is conducive to more effectively regenerating the moisture adsorbed in the desorption adsorbent and reducing the presence of residual moisture in the adsorbent in the lower part of the drying tower.

[0042] In addition, the present invention adopts the regeneration gas-compressed hot air heat exchanger 5 as the regeneration airflow preheating device, so that when it is equipped with an oil-injected screw air compressor, the low-temperature compressed hot air (65-80°C) at the outlet of the air compressor can be effectively used as a heat source to preheat the regeneration airflow, and the insufficient heat is provided by the electric heater 25, which can effectively reduce the regeneration heating energy consumption. When it is equipped with a centrifugal air compressor or an oil-free screw air compressor, the electric heater 25 can be turned off, so that the regeneration gas-compressed hot air heat exchanger 5 is directly used as the regeneration airflow heating device, so as to effectively use the high-temperature compressed hot air (110-150°C) at the outlet of the air compressor as a heat source to directly heat the regeneration airflow, completely saving the energy consumption of the electric heater 25.

[0043] Embodiment 2, as a further preferred embodiment of embodiment 1, the refrigerant inlet and refrigerant outlet of the cold dryer heat exchanger 3 are respectively connected to the outlet and inlet of the first refrigeration device 31; the refrigerant inlet and refrigerant outlet of the regeneration gas cooling heat exchanger 4 are respectively connected to the outlet and inlet of the second refrigeration device 32. The refrigerant can be output to the cold dryer heat exchanger 3 through the first refrigeration device 31, so that the input compressed air can be cooled by the cold capacity provided by the cold dryer heat exchanger 3, and the refrigerant after heat exchange can enter the first refrigeration device 31 again through the pipeline for recycling; the refrigerant can be output to the regeneration gas cooling heat exchanger 4 through the second refrigeration device 32, so that the regeneration heating airflow can be cooled by the cold capacity provided by the regeneration gas cooling heat exchanger 4, and the refrigerant after heat exchange can enter the second refrigeration device 32 again through the pipeline for recycling.

[0044] Embodiment 3, as a further preferred embodiment of embodiment 1, a thirteenth pipeline 34 is connected between the heat exchange pipeline 26 and the tenth pipeline 27, a ninth valve 35 is installed on the thirteenth pipeline 34, and a tenth valve 36 is installed at the first inlet end of the regeneration gas-compressed hot air heat exchanger 5.

[0045] like Figure 6 As shown, working condition 6 may also be included: cooling state; at this time, the first valve 10, the fourth valve 14, the fifth valve 18, the eighth valve 23, the tenth valve 36, the eleventh valve 37 and the twelfth valve 38 are closed; the second valve 11, the third valve 13, the sixth valve 19, the seventh valve 22 and the ninth valve 35 are opened, the booster pump 33 is started, and the electric heater 25 is turned off;

[0046] At this time, the compressed air input from the compressed air inlet pipe 6 is first adsorbed and dried according to the process described in working condition 1, and then a part of the outlet air is separated in the compressed air outlet pipe 20 as the regeneration air flow. After the separated regeneration air flow is pressurized by the booster pump 33, it flows through the heat exchange pipeline 26 and directly flows from the thirteenth pipeline 34 to the electric heater 25. At this time, the electric heater 25 is turned off and no longer heats. Therefore, after the regeneration air flow flows through the electric heater 25, it flows through the ninth pipeline 24, the eighth pipeline 21, the seventh valve 22 and the sixth pipeline 16 in sequence, and then enters the A tower 1 from the upper part of the A tower 1 to perform cold blowing on the regenerated A tower 1. Afterwards, the regeneration gas flow carries the desorbed moisture and flows out from the bottom of tower A 1, and flows through the second pipeline 8, the fourth pipeline 12, the third valve 13 and the fifth pipeline 15 in sequence, and then enters the regeneration gas cooling heat exchanger 4 from the air inlet of the regeneration gas cooling heat exchanger 4, so that the regeneration gas flow is cooled by the cooling capacity provided by the refrigerant circulating in the regeneration gas cooling heat exchanger 4 to condense the desorbed moisture carried and flow out; and the cooled regeneration gas flow flows into the first pipeline 7 from the air outlet of the regeneration gas cooling heat exchanger 4, and then mixes with the compressed air flowing out from the air outlet of the cold dryer heat exchanger 3, thereby completing the internal circulation of the regeneration gas flow.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A zero-gas consumption combined dryer, Features: The invention comprises a tower A (1), a tower B (2), a cold dryer heat exchanger (3), a regeneration gas cooling heat exchanger (4) and a regeneration gas-compressed hot air heat exchanger (5), wherein the air inlet of the cold dryer heat exchanger (3) is connected to a compressed air inlet pipe (6), the air outlet of the cold dryer heat exchanger (3) is connected to one end of a first pipeline (7), the other end of the first pipeline (7) is respectively connected to one end of a second pipeline (8) and one end of a third pipeline (9) through a tee, the other end of the second pipeline (8) is connected to the lower end of the tower A (1), the third pipeline (9) is connected to the lower end of the tower B (2), and the second pipeline (8) is connected to the lower end of the tower B (2). A first valve (10) and a second valve (11) are respectively installed at one end of the pipeline (8) and the third pipeline (9) close to the three-way connection; a fourth pipeline (12) is fixedly connected between the second pipeline (8) and the third pipeline (9); a third valve (13) and a fourth valve (14) are respectively installed on the fourth pipeline (12); one end of a fifth pipeline (15) is fixedly connected between the third valve (13) and the fourth valve (14); the other end of the fifth pipeline (15) is connected to the air inlet of the regeneration gas cooling heat exchanger (4); and the air outlet of the regeneration gas cooling heat exchanger (4) is connected to the first pipeline (7); The upper ends of the A tower (1) and the B tower (2) are connected to one end of a sixth pipeline (16) and one end of a seventh pipeline (17), respectively; the other ends of the sixth pipeline (16) and the seventh pipeline (17) are respectively installed with a fifth valve (18) and a sixth valve (19); the other ends of the sixth pipeline (16) and the seventh pipeline (17) are connected to a compressed air outlet pipe (20) through a tee; an eighth pipeline (21) is fixedly connected between the sixth pipeline (16) and the seventh pipeline (17); a seventh valve (22) and an eighth valve (23) are respectively installed on the eighth pipeline (21); one end of a ninth pipeline (24) is fixedly connected between the seventh valve (22) and the eighth valve (23); the other end of the ninth pipeline (24) is connected to the outlet end of the electric heater (25); The compressed air outlet pipe (20) is connected to one end of a heat exchange pipeline (26), and the other end of the heat exchange pipeline (26) is connected to a first inlet end of a regeneration gas-compressed hot air heat exchanger (5). The first outlet end of the regeneration gas-compressed hot air heat exchanger (5) is connected to an inlet end of an electric heater (25) via a tenth pipeline (27), and the second inlet end of the regeneration gas-compressed hot air heat exchanger (5) is connected to a hot air output pipeline generated by an air compressor.

2. A zero-gas consumption combined dryer according to claim 1, Features: The eighth pipeline (21) is connected to one end of an eleventh pipeline (29) and one end of a twelfth pipeline (30), respectively; the eleventh pipeline (29) is located between the seventh valve (22) and the ninth pipeline (24); the twelfth pipeline (30) is located between the eighth valve (23) and the ninth pipeline (24); the other end of the eleventh pipeline (29) is connected to the middle of the A tower (1); the other end of the twelfth pipeline (30) is connected to the middle of the B tower (2); the eleventh valve (37) and the twelfth valve (38) are installed on the eleventh pipeline (29) and the twelfth pipeline (30), respectively.

3. A zero-gas consumption combined dryer according to claim 1, Features: The refrigerant inlet and the refrigerant outlet of the cold dryer heat exchanger (3) are respectively connected to the outlet and the inlet of the first refrigeration device (31); the refrigerant inlet and the refrigerant outlet of the regeneration gas cooling heat exchanger (4) are respectively connected to the outlet and the inlet of the second refrigeration device (32).

4. A zero-gas consumption combined dryer according to claim 1, Features: A booster pump (33) is installed on the heat exchange pipeline (26).

5. A zero-gas consumption combined dryer according to claim 1, Features: A thirteenth pipeline (34) is connected between the heat exchange pipeline (26) and the tenth pipeline (27), a ninth valve (35) is installed on the thirteenth pipeline (34), and a tenth valve (36) is installed at the first inlet end of the regenerated gas-compressed hot air heat exchanger (5).

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