A micro-heat regeneration adsorption dryer

Abstract

This utility model discloses a micro-heat regenerative adsorption dryer, including a frame, a PLC controller, and two alternately operating adsorption towers. An air inlet is connected to the bottom of each adsorption tower, and an exhaust pipe is connected in parallel to the air inlet. An exhaust pipe is connected to the top of each adsorption tower, and a regeneration gas pipe is connected in parallel to the exhaust pipe. The adsorption tower has two horizontally arranged perforated plates spaced longitudinally inside, with a composite adsorbent filling the space between the two plates. An airflow distributor is located at the bottom of the adsorption tower, including a gas collection box located below the bottom perforated plates. The bottom of the gas collection box is connected to the bottom air inlet of the adsorption tower, and several evenly spaced gas outlets are arranged on the top of the gas collection box. Two sets of electric heating units are arranged along the length of the regeneration gas pipe. The output of the PLC controller is connected to the controlled end of the electric heating units. This utility model has high drying and regeneration efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of compressed air drying equipment, specifically to a micro-heat regeneration adsorption dryer. Background Technology

[0002] In industrial production, compressed air is widely used as a power source or process medium, but the moisture it contains can lead to pipeline corrosion, equipment damage, and a decline in product quality. Adsorption dryers use adsorbents (such as molecular sieves and activated alumina) to adsorb moisture from compressed air, achieving deep drying (dew point can reach below -40℃).

[0003] Existing adsorption dryers are mainly classified into three categories: heatless regeneration, heated regeneration, and micro-heated regeneration. Among them, the micro-heated regeneration adsorption dryer, which uses a small amount of heat to assist in the regeneration of the adsorbent, achieves a balance between energy consumption and regeneration efficiency, and has become one of the mainstream technologies. However, existing technologies still have the following shortcomings:

[0004] Uneven gas distribution: Uneven gas distribution in the adsorption tower can lead to localized over-saturation of the adsorbent, reducing drying efficiency and accelerating adsorbent aging.

[0005] Low regeneration efficiency: Traditional regeneration gas pipeline heating structure is simple and has low heat utilization rate, resulting in long regeneration cycle and high energy consumption;

[0006] Poor control precision: The lack of precise control over the heating temperature makes it easy for temperature fluctuations to affect the adsorbent's lifespan and drying effect. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a micro-heat regeneration adsorption dryer to solve the problems of uneven airflow distribution, low regeneration efficiency and poor control precision in the prior art.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows.

[0009] A micro-thermal regenerative adsorption dryer includes a frame, on which a PLC controller and two adsorption towers arranged side-by-side and operating alternately are mounted. The bottom inlet of each adsorption tower is connected to an inlet pipe, which is connected in parallel to an exhaust pipe. The top of each adsorption tower is connected to an outlet pipe, which is connected in parallel to a regeneration gas pipe. The adsorption tower has two horizontally arranged, detachable perforated plates spaced longitudinally inside, with a composite adsorbent filling the space between the two plates. An airflow distributor is located at the bottom of the adsorption tower, including a gas collection box located below the bottom perforated plates. The bottom of the gas collection box is connected to the bottom inlet of the adsorption tower, and the top of the gas collection box has several evenly spaced outlets connected to the gas collection box. The regeneration gas pipe has two sets of electric heating units arranged along its length, each electric heating unit including an electric heating tube arranged circumferentially along the inner wall of the regeneration gas pipe. The output of the PLC controller is connected to the controlled end of the electric heating tube.

[0010] Preferably, the composite adsorbent comprises, from bottom to top, a water-absorbing sphere layer, a molecular sieve layer, and an activated alumina layer.

[0011] Preferably, the air intake pipeline includes a main air intake pipe for connecting to an external compressed air source, the other end of the main air intake pipe is connected to two branch air intake pipes, the other ends of the two branch air intake pipes are connected to the bottom air inlets of the two adsorption towers respectively, and a first air intake valve and a second air intake valve are respectively provided on the two branch air intake pipes; the output terminal of the PLC controller is connected to the controlled terminals of the first air intake valve and the second air intake valve respectively.

[0012] Preferably, the exhaust pipeline includes a main exhaust pipe for exhausting air, one end of which is connected to a muffler, and the other end of which is connected to two branch exhaust pipes. The other ends of the two branch exhaust pipes are connected to two branch intake pipes in a one-to-one correspondence, and a first exhaust valve and a second exhaust valve are respectively provided on the two branch exhaust pipes. The first exhaust valve and the second exhaust valve are connected in parallel with the first intake valve and the second intake valve. The output terminal of the PLC controller is connected to the controlled terminals of the first exhaust valve and the second exhaust valve respectively.

[0013] Preferably, the gas outlet pipeline includes a main gas outlet pipe, one end of which is equipped with a main gas outlet valve, and the other end of which is connected to two branch gas outlet pipes. The two branch gas outlet pipes are connected to the top gas outlets of the two adsorption towers one-to-one, and the two branch gas outlet pipes are equipped with a first gas outlet check valve and a second gas outlet check valve one-to-one. The output terminal of the PLC controller is connected to the controlled terminal of the main gas outlet valve.

[0014] Preferably, the regenerated gas pipeline includes a main regenerated gas pipeline. One end of the main regenerated gas pipeline is equipped with a regenerated gas flow regulating valve and is connected to the main outlet gas pipeline, with the connection point located between the main outlet gas valve and the branch outlet gas pipeline. The other end of the main regenerated gas pipeline is connected to two branch regenerated gas pipelines, which are connected to two branch outlet gas pipelines in a one-to-one correspondence. A first regenerated gas check valve and a second regenerated gas check valve are respectively installed on the two branch regenerated gas pipelines. The output terminal of the PLC controller is connected to the controlled terminal of the regenerated gas flow regulating valve.

[0015] Preferably, a temperature sensor is installed on the main regeneration gas pipe, and the electric heating unit is installed in the main regeneration gas pipe and located between the regeneration gas flow regulating valve and the temperature sensor; the input terminal of the PLC controller is connected to the output terminal of the temperature sensor.

[0016] The technological advancements achieved by this utility model are as follows, due to the adoption of the above technical solutions.

[0017] This invention features uniform airflow distribution: the airflow distributor can evenly distribute the incoming air to the cross-section of the composite adsorbent, avoiding local overload of the composite adsorbent, extending the life of the composite adsorbent, and improving drying efficiency.

[0018] This invention features high regeneration efficiency: two sets of circumferential electric heating units are installed in the regeneration gas pipeline, and the heat is directly applied to the regeneration gas, resulting in high heat utilization, shortening the regeneration cycle, and reducing energy consumption.

[0019] This invention offers precise control: the PLC controller adjusts the power of the electric heating element, gas flow rate, and heating time in real time based on the values ​​monitored by the temperature sensor, thus avoiding the impact of temperature fluctuations on the composite adsorbent and improving equipment stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] The components include: 1. Adsorption tower, 2. Perforated plate, 3. Composite adsorbent, 31. Water-absorbing sphere layer, 32. Molecular sieve layer, 33. Activated alumina layer, 4. Airflow distributor, 41. Gas collection box, 42. Gas outlet, 5. Inlet pipe, 51. Main inlet pipe, 52. Branch inlet pipe, 53. First inlet valve, 54. Second inlet valve, 6. Exhaust pipe, 61. Main exhaust pipe, 62. Branch exhaust pipe, 63. First exhaust valve, 64. Second exhaust valve. 65. Exhaust valve, 7. Silencer, 7. Exhaust pipe, 71. Main exhaust pipe, 72. Branch exhaust pipe, 73. Main exhaust valve, 74. First exhaust check valve, 75. Second exhaust check valve, 8. Regeneration gas pipe, 81. Main regeneration gas pipe, 82. Branch regeneration gas pipe, 83. Regeneration gas flow regulating valve, 84. First regeneration gas check valve, 85. Second regeneration gas check valve, 9. Electric heating unit, 91. Electric heating element, 10. Temperature sensor. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0023] A micro-heat regeneration adsorption dryer, combined with Figure 1 As shown, the device includes a frame, on which a PLC controller and two adsorption towers 1 are mounted. The two adsorption towers 1 are arranged side by side and operate alternately. The bottom air inlet of the adsorption tower 1 is connected to an air inlet pipe 5, which is connected in parallel to an exhaust pipe 6; the top of the adsorption tower 1 is connected to an exhaust pipe 7, which is connected in parallel to a regeneration gas pipe 8.

[0024] The air intake pipe 5 includes a main air intake pipe 51. One end of the main air intake pipe 51 is used to connect to an external compressed air source. The other end of the main air intake pipe 51 is connected to two branch air intake pipes 52. The other ends of the two branch air intake pipes 52 are connected to the bottom air inlets of the two adsorption towers 1 respectively. A first air intake valve 53 and a second air intake valve 54 are respectively provided on the two branch air intake pipes 52. The first air intake valve 53 and the second air intake valve 54 are used to control the compressed air to alternately enter the two adsorption towers 1 for adsorption, thereby achieving drying.

[0025] The adsorption tower 1 has two horizontally arranged and detachable perforated plates 2 arranged longitudinally inside. The space between the two perforated plates 2 is filled with a composite adsorbent 3. The composite adsorbent 3 includes a water-absorbing sphere layer 31, a molecular sieve layer 32 and an activated alumina layer 33 arranged from bottom to top, which can realize layered adsorption and improve the adsorption and drying effect.

[0026] An airflow distributor 4 is installed at the bottom of the adsorption tower 1. The airflow distributor 4 includes a gas collection box 41 located below the bottom perforated plate 2. The bottom of the gas collection box 41 is connected to the bottom air inlet of the adsorption tower 1. Several air outlets 42 are evenly installed on the top of the gas collection box 41 and are connected to the gas collection box 41. Compressed air is evenly distributed to the cross-section of the composite adsorbent 3 through the air outlets 42 on the gas collection box 41, which can avoid local overload of the composite adsorbent 3, extend its service life, and improve drying efficiency.

[0027] The gas outlet pipe 7 includes a main gas outlet pipe 71. One end of the main gas outlet pipe 71 is equipped with a main gas outlet valve 73, which is used to control the discharge of dry gas. The other end of the main gas outlet pipe 71 is connected to two branch gas outlet pipes 72. The two branch gas outlet pipes 72 are connected to the top gas outlets of the two adsorption towers 1 one by one. The two branch gas outlet pipes 72 are equipped with a first gas outlet check valve 74 and a second gas outlet check valve 75, which are used to prevent the dry gas discharged from the adsorption tower 1 from flowing back into the adsorption tower 1.

[0028] The regeneration gas pipeline 8 includes a main regeneration gas pipeline 81. One end of the main regeneration gas pipeline 81 is equipped with a regeneration gas flow regulating valve 83 and is connected to the main outlet pipeline 71. The connection point is located between the main outlet valve 73 and the branch outlet pipeline 72. The regeneration gas flow regulating valve 83 is used to control the flow rate of the dry gas entering the regeneration gas pipeline 8. The other end of the main regeneration gas pipeline 81 is connected to two branch regeneration gas pipelines 82. The two branch regeneration gas pipelines 82 are connected to the two branch outlet pipelines 72 one by one. The two branch regeneration gas pipelines 82 are equipped with a first regeneration gas check valve 84 and a second regeneration gas check valve 85 one by one. The first regeneration gas check valve 84 and the second regeneration gas check valve 85 control the dry gas in the regeneration gas pipeline 8 to enter the adsorption tower 1 that needs to be regenerated.

[0029] Two sets of electric heating units 9 are installed inside the regeneration gas pipeline 8 along its length. The electric heating units 9 are used to heat the dry gas in the regeneration gas pipeline 8, thereby regenerating the composite adsorbent 3 in the adsorption tower 1 that needs to be regenerated.

[0030] Specifically, the electric heating unit 9 includes an electric heating tube 91 arranged circumferentially along the inner wall of the regeneration gas pipeline 8. A temperature sensor 10 is provided on the main regeneration gas pipeline 81, and the electric heating unit 9 is located in the main regeneration gas pipeline 81 and between the regeneration gas flow regulating valve 83 and the temperature sensor 10. The temperature sensor 10 is used to monitor the temperature of the regeneration gas.

[0031] The exhaust pipe 6 includes a main exhaust pipe 61 for exhausting gas. One end of the main exhaust pipe 61 is connected to a muffler 65, and the other end of the main exhaust pipe 61 is connected to two branch exhaust pipes 62. The other ends of the two branch exhaust pipes 62 are connected to two branch intake pipes 52 respectively. A first exhaust valve 63 and a second exhaust valve 64 are respectively installed on the two branch exhaust pipes 62. The first exhaust valve 63 and the second exhaust valve 64 are connected in parallel with the first intake valve 53 and the second intake valve 54. The first exhaust valve 63 and the second exhaust valve 64 are used to control the discharge of regenerated gas from the corresponding adsorption tower 1.

[0032] The input terminal of the PLC controller is connected to the output terminal of the temperature sensor 10; the output terminal of the PLC controller is connected to the controlled terminals of the first inlet valve 53, the second inlet valve 54, the main outlet valve 73, the regeneration gas flow regulating valve 83, the electric heating tube 91, the first exhaust valve 63 and the second exhaust valve 64 respectively, thereby realizing the automatic control of the alternating adsorption and regeneration process of the two adsorption towers 1.

[0033] The working principle of this utility model is as follows:

[0034] Adsorption stage: Compressed air is dried through main intake pipe 51 → branch intake pipe 52 → airflow distributor 4 → composite adsorbent 3, and the dried air is discharged through branch outlet pipe 72 → main outlet pipe 71.

[0035] Regeneration stage: The PLC closes the first intake valve 53 and the second intake valve 54, and opens the first exhaust valve 63 and the second exhaust valve 64. At the same time, the regeneration gas flow regulating valve 83 is opened. Dry air passes through the main exhaust pipe 71 → main regeneration gas pipe 81 → electric heating tube 91 → branch regeneration gas pipe 82 → adsorption tower 1, and desorbs moisture from top to bottom through the composite adsorbent 3. The temperature sensor 10 feeds back the temperature to the PLC in real time and adjusts the power of the electric heating tube 91.

[0036] Cooling stage: After heating is stopped, the PLC adjusts the regeneration gas flow regulating valve 83 to increase the air volume, and the composite adsorbent is cooled by ambient dry air to below 3 to 50°C, thus completing the regeneration.

Claims

1. A micro-heat regenerative adsorption dryer, comprising a rack, a PLC controller and two adsorption towers (1) arranged side by side and working alternately arranged on the rack; an air inlet pipeline (5) is connected to the bottom air inlet of the adsorption tower (1), and the air inlet pipeline (5) is connected in parallel with an exhaust pipeline (6); an air outlet pipeline (7) is connected to the top of the adsorption tower (1), and the air outlet pipeline (7) is connected in parallel with a regenerative gas pipeline (8), characterized in that: The adsorption tower (1) has two horizontally arranged and detachable perforated plates (2) arranged longitudinally inside, and a composite adsorbent (3) is filled between the two perforated plates (2); an airflow distributor (4) is arranged at the bottom of the adsorption tower (1), the airflow distributor (4) includes a gas collection box (41) located below the bottom perforated plate (2), the bottom of the gas collection box (41) is connected to the bottom air inlet of the adsorption tower (1), and several air outlets (42) are evenly arranged on the top of the gas collection box (41) and connected to the gas collection box (41); two sets of electric heating units (9) are arranged along the length direction inside the regeneration gas pipeline (8), and the electric heating unit (9) includes an electric heating tube (91) arranged circumferentially along the inner wall of the regeneration gas pipeline (8); the output end of the PLC controller is connected to the controlled end of the electric heating tube (91). ​ 2. The micro-heat regenerative adsorption dryer according to claim 1, characterized in that: The composite adsorbent (3) includes a water-absorbing sphere layer (31), a molecular sieve layer (32), and an activated alumina layer (33) arranged sequentially from bottom to top.

3. The micro-heat regenerative adsorption dryer according to claim 1, characterized in that: The air intake pipe (5) includes a main air intake pipe (51) for connecting to an external compressed air source. The other end of the main air intake pipe (51) is connected to two branch air intake pipes (52). The other ends of the two branch air intake pipes (52) are connected to the bottom air inlets of the two adsorption towers (1) respectively. A first air intake valve (53) and a second air intake valve (54) are provided on the two branch air intake pipes (52) respectively. The output end of the PLC controller is connected to the controlled end of the first air intake valve (53) and the second air intake valve (54) respectively.

4. The micro-heat regenerative adsorption dryer according to claim 3, characterized in that: The exhaust pipe (6) includes a main exhaust pipe (61) for exhausting air. One end of the main exhaust pipe (61) is connected to a muffler (65). The other end of the main exhaust pipe (61) is connected to two branch exhaust pipes (62). The other ends of the two branch exhaust pipes (62) are connected to two branch intake pipes (52) in a one-to-one correspondence. A first exhaust valve (63) and a second exhaust valve (64) are provided on the two branch exhaust pipes (62) in a one-to-one correspondence. The first exhaust valve (63) and the second exhaust valve (64) are connected in parallel with the first intake valve (53) and the second intake valve (54). The output end of the PLC controller is connected to the controlled end of the first exhaust valve (63) and the second exhaust valve (64) respectively.

5. The micro-heat regenerative adsorption dryer according to claim 1, characterized in that: The gas outlet pipeline (7) includes a main gas outlet pipeline (71), one end of which is provided with a main gas outlet valve (73), and the other end of the main gas outlet pipeline (71) is connected to two branch gas outlet pipelines (72). The two branch gas outlet pipelines (72) are connected to the top gas outlets of the two adsorption towers (1) one by one, and the two branch gas outlet pipelines (72) are provided with a first gas outlet check valve (74) and a second gas outlet check valve (75) one by one. The output end of the PLC controller is connected to the controlled end of the main gas outlet valve (73).

6. A micro-heat regenerative adsorption dryer according to claim 5, characterized in that: The regenerated gas pipeline (8) includes a main regenerated gas pipeline (81). One end of the main regenerated gas pipeline (81) is provided with a regenerated gas flow regulating valve (83) and is connected to the main outlet pipeline (71). The connection point is located between the main outlet valve (73) and the branch outlet pipeline (72). The other end of the main regenerated gas pipeline (81) is connected to two branch regenerated gas pipelines (82). The two branch regenerated gas pipelines (82) are connected to the two branch outlet pipelines (72) one by one. The two branch regenerated gas pipelines (82) are provided with a first regenerated gas check valve (84) and a second regenerated gas check valve (85) one by one. The output end of the PLC controller is connected to the controlled end of the regenerated gas flow regulating valve (83).

7. A micro-heat regenerative adsorption dryer according to claim 6, characterized in that: A temperature sensor (10) is installed on the main regeneration gas pipe (81), and an electric heating unit (9) is installed in the main regeneration gas pipe (81) and located between the regeneration gas flow regulating valve (83) and the temperature sensor (10); the input terminal of the PLC controller is connected to the output terminal of the temperature sensor (10).

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