Three-tower circulating adsorption type compressed air dryer

Abstract

The utility model provides a three-tower circulation adsorption type compressed air dryer which comprises a circulation pipeline, an air inlet and an air outlet are formed in the two ends of the circulation pipeline respectively, and an adsorption tower set is connected into the circulation pipeline so that humid compressed air can enter the adsorption tower set from the air inlet to be subjected to moisture adsorption. Dry compressed air is discharged from the air outlet; wherein the adsorption tower group comprises a first adsorption tower, a second adsorption tower and a third adsorption tower, and when any adsorption tower is in an adsorption state, the other two adsorption towers are respectively in a regeneration state and a cold blowing state; according to the utility model, the energy consumption and regeneration gas consumption of the dryer can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the field of compressed air dryers, in particular to a three-tower circulating adsorption type compressed air dryer. Background Art

[0002] Conventional compressed air purification devices mostly use a double-tower structure, and the process steps include adsorption, heating, and cooling. During heating, the regeneration gas comes from the compressed air at the equipment outlet. After throttling and reducing pressure, it enters the electric heater and is heated to the regeneration temperature. The regeneration gas analyzed as the adsorber bed carries the water vapor precipitated by the adsorbent and is discharged from the muffler. The regeneration cooling is taken from its own dry air, which is used as the regeneration cooling gas to cool the bed after decompression to meet the needs of the next stage of adsorption work.

[0003] In the above working mode, the heating regeneration stage requires heating the dry compressed air through an electric heater, which consumes a relatively high amount of electric energy. In the cold blowing and cooling stage, more dry compressed air is required for cooling, resulting in more regeneration gas consumption during the cold blowing period. Utility Model Content

[0004] The utility model aims to provide a three-tower circulating adsorption compressed air dryer which can effectively reduce the energy consumption of the dryer and the consumption of regenerated gas.

[0005] In order to solve the above technical problems, the utility model provides a three-tower circulating adsorption compressed air dryer, including a circulating pipeline, with an air inlet and an air outlet respectively arranged at both ends of the circulating pipeline, and an adsorption tower group is connected to the circulating pipeline, so that the moist compressed air enters the adsorption tower group from the air inlet for moisture adsorption, and then the dry compressed air is discharged from the air outlet; wherein the adsorption tower group includes a first adsorption tower, a second adsorption tower and a third adsorption tower, when any adsorption tower is in an adsorption state, the other two adsorption towers are in a regeneration state and a cold blowing state respectively; a vortex cooler is connected to the circulating pipeline, the hot end outlet of the vortex cooler forms a regeneration flow channel with the adsorption tower group, and the cold end outlet of the vortex cooler forms a cooling flow channel with the adsorption tower group.

[0006] Furthermore, sight glasses are installed on the sides of the tower bodies of the first adsorption tower, the second adsorption tower and the third adsorption tower.

[0007] Furthermore, indicating adsorbents are installed at the lower inner portions of the first adsorption tower, the second adsorption tower and the third adsorption tower near the sight glass.

[0008] Furthermore, a heater is connected to the circulation pipeline so that the heater can perform compensatory heating on the hot end outlet of the vortex cooler.

[0009] The beneficial effects of the utility model are:

[0010] 1. The three-tower adsorption tower group is set up so that when one of the adsorption towers is adsorbing, the other two adsorption towers can be regenerated and cold-blown respectively, making the overall adsorption-regeneration-cold-blowing process of the equipment more efficient;

[0011] 2. The hot end outlet and cold end outlet of the vortex cooler can be used for heating the adsorption tower in the regeneration stage and the adsorption tower in the cold blowing and cooling stage respectively. Since when one of the adsorption towers is in the adsorption state, the other two adsorption towers are in the regeneration and cold blowing stages respectively. Therefore, at the same time, the heat and cold generated by the hot end outlet and the cold end outlet of the vortex cooler can produce corresponding effects on different adsorption towers, greatly reducing the power consumption and regeneration gas consumption;

[0012] 3. Through the setting of the heater, when the heat at the hot end outlet of the vortex cooler is insufficient, the heater can be used for heat compensation, while ensuring sufficient conditions for adsorbent regeneration, and without the energy consumption of traditional pure electric heaters for heating;

[0013] 4. Through the setting of indicating adsorbent and sight glass, users can conveniently and intuitively judge whether the adsorbent is fully regenerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure numerals: 1. first adsorption tower; 2. second adsorption tower; 3. third adsorption tower; 4. vortex cooler; 5. heater; 6. exhaust muffler; 7. circulation pipeline; 8. air inlet; 9. air outlet. DETAILED DESCRIPTION

[0016] 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 belong to the scope of protection of the utility model.

[0017] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0018] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0019] like Figure 1 The utility model provides a three-tower circulating adsorption compressed air dryer, including a circulating pipeline 7, with an air inlet 8 and an air outlet 9 respectively arranged at both ends of the circulating pipeline 7, and an adsorption tower group is connected to the circulating pipeline 7, so that the moist compressed air enters the adsorption tower group from the air inlet 8 for moisture adsorption, and then the dry compressed air is discharged from the air outlet 9; wherein the adsorption tower group includes a first adsorption tower 1, a second adsorption tower 2 and a third adsorption tower 3, when any one of the adsorption towers is in an adsorption state, the other two adsorption towers are in a regeneration state and a cold blowing state, respectively.

[0020] Among them, the cycle duration of the adsorption stage, regeneration stage and cold blowing stage can be set by the system.

[0021] In a preferred embodiment of the present scheme, when the device is started, a fully regenerated adsorption tower can be automatically selected to perform the adsorption stage to ensure that dry air can be quickly obtained.

[0022] It is worth mentioning that a number of programmable valves are provided in the circulation pipeline of this scheme, and the programmable valves are equipped with double-acting actuators, double-eccentric valve bodies, and pneumatic triplexes, so that this scheme can control the switching of pipelines by opening and closing valves, thereby realizing the alternating use of different adsorption towers in different stages.

[0023] Specifically, when the first adsorption tower 1 is in the adsorption stage, each adsorption tower is operated according to the following stage flow and Table 1:

[0024] 1) Adsorption in the first adsorption tower 1: Compressed air (containing water) enters the first adsorption tower 1, and the compressed air is dried by utilizing the water absorption property of the adsorbent. The dried compressed air is discharged from the pipeline of the air outlet 9.

[0025] 2) While the first adsorption tower 1 is adsorbing, a portion of the air at the air outlet 9 is taken and diverted into hot air and cold air through the vortex cooler 4 .

[0026] 3) The hot air enters the second adsorption tower 2, at which time the adsorbent in the second adsorption tower 2 is in an adsorption saturation state. The hot air heats the adsorbent, and the moisture in the adsorbent is discharged from the exhaust muffler 6 along with the hot air, and the adsorbent becomes a high-temperature unsaturated state;

[0027] At the same time, cold air enters the third adsorption tower 3. At this time, the adsorbent in the third adsorption tower 3 is in the heating regeneration completion stage. The cold air cools the high-temperature adsorbent, and the adsorbent becomes a low-temperature state, ready to enter the adsorption state of the next cycle.

[0028]

[0029] Preferably, a vortex cooler 4 is connected to the circulation pipeline 7, a hot end outlet of the vortex cooler 4 forms a regeneration channel with the adsorption tower group, and a cold end outlet of the vortex cooler 4 forms a cooling channel with the adsorption tower group.

[0030] Among them, the vortex cooler is an existing technology, which usually includes a nozzle, a vortex chamber, a cold end pipe, a hot end pipe and a hot end regulating valve. An adjustable knob is provided at the hot end outlet, and the temperature and flow of the corresponding airflow can be adjusted by setting the ratio of cold and hot airflows.

[0031] Specifically, the heat and cold generated by the hot end outlet and the cold end outlet of the vortex cooler can be used to heat the adsorption tower in the regeneration stage and the cold blowing and cooling stage, respectively, greatly reducing the power consumption and regeneration gas consumption.

[0032] Preferably, the first adsorption tower 1 , the second adsorption tower 2 , and the third adsorption tower 3 are all equipped with sight glasses on their sides.

[0033] In one embodiment of the present scheme, an indicating adsorbent is installed at a position near the inner lower part of the first adsorption tower 1, the second adsorption tower 2 and the third adsorption tower 3 near the sight glass, so that the adsorbent can change color as the moisture absorption amount increases, which is convenient for users to observe. Combined with the setting of the sight glass, the convenience of observing whether the adsorbent is fully regenerated can be further improved.

[0034] Specifically, the sight glass is installed at the lower part of the tower body, so that the user can observe the indicating adsorbent through the sight glass.

[0035] Among them, the indicating adsorbent can be made of cobalt-free color-changing silica gel, and the sight glass is made of tempered borosilicate glass.

[0036] Preferably, a heater 5 is connected to the circulation pipeline 7 so that the heater 5 can perform compensatory heating on the hot end outlet of the vortex cooler 4 .

[0037] Specifically, when the temperature at the hot end outlet of the vortex cooler is lower than the set temperature, the heater can be started to perform compensatory heating at that location.

[0038] The temperature of the hot end outlet of the vortex cooler can be detected by setting a temperature sensor.

[0039] In the actual use of this scheme, taking the first adsorption tower 1 as an example, the following working process can be adopted:

[0040] Adsorption step: The programmable valve K1A at the bottom of the first adsorption tower 1 is opened, and the raw gas enters the first adsorption tower 1 through the pipeline air inlet 8. The moisture is adsorbed at a pressure of about 0.7-1.0MPa, and the dry gas enters the downstream user from the outlet 9 through the pipeline and the top programmable valve K5A.

[0041] Emptying step: After the adsorption step is completed, the air inlet programmable valve K1A at the bottom of the first adsorption tower 1 is closed, and the adsorption tower exhaust programmable valve K2A is opened, and the gas in the first adsorption tower 1 is emptied through the pipeline and the exhaust muffler 6.

[0042] Heating regeneration step: After the emptying step is completed, the adsorption tower exhaust programmable valve K2A is not closed, and the air at the hot end outlet of the vortex cooler 4 enters the adsorption tower through the pipeline and the heating regeneration inlet valve K4A of the first adsorption tower 1. The adsorbed moisture is carried out of the first adsorption tower 1 by the hot gas and discharged through the exhaust programmable valve K2A and the pipeline.

[0043] Cold blowing step: After the heating regeneration step is completed, the heating regeneration air inlet valve K4A of the first adsorption tower 1 is closed. The air at the cold end outlet of the vortex cooler 4 enters the first adsorption tower 1 through the pipeline and the cold blowing cooling air inlet valve K3A of the first adsorption tower 1, taking away the heat in the first adsorption tower 1 and cold blowing it to the ambient temperature.

[0044] Pressurization step: Close the exhaust programmable valve K2A, and the pressure in the tower will gradually increase to the adsorption working pressure of 0.7-1.0MPa to prepare for the next adsorption.

[0045] At this point, one cycle of the first adsorption tower 1 is completed, and the next cycle is immediately carried out. Each adsorption tower undergoes the same steps, only staggered in time, so that the product gas is continuously and stably output.

[0046] The present utility model is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all those having the same or similar technical solutions as the present application fall within the protection scope of the present utility model.

Claims

1. A three-tower circulating adsorption compressed air dryer, characterized in that: The invention comprises a circulation pipeline (7), wherein both ends of the circulation pipeline (7) are respectively provided with an air inlet (8) and an air outlet (9), and an adsorption tower group is connected to the circulation pipeline (7), so that moist compressed air enters the adsorption tower group through the air inlet (8) to adsorb moisture, and then the dry compressed air is discharged through the air outlet (9); wherein the adsorption tower group comprises a first adsorption tower (1), a second adsorption tower (2) and a third adsorption tower (3), and when any one of the adsorption towers is in an adsorption state, the other two adsorption towers are respectively in a regeneration state and a cold blowing state; and a vortex cooler (4) is connected to the circulation pipeline (7), wherein the hot end outlet of the vortex cooler (4) and the adsorption tower group form a regeneration flow channel, and the cold end outlet of the vortex cooler (4) and the adsorption tower group form a cooling flow channel.

2. The three-tower circulating adsorption compressed air dryer according to claim 1 is characterized in that: The first adsorption tower (1), the second adsorption tower (2) and the third adsorption tower (3) are all equipped with sight glasses on the sides of the tower bodies.

3. The three-tower circulating adsorption compressed air dryer according to claim 2 is characterized in that: Indicating adsorbents are installed at positions close to the sight glasses on the inner lower parts of the first adsorption tower (1), the second adsorption tower (2) and the third adsorption tower (3).

4. The three-tower circulating adsorption compressed air dryer according to claim 1 is characterized in that: A heater (5) is connected to the circulation pipeline (7) so that the heater (5) can perform compensatory heating on the hot end outlet of the vortex cooler (4).

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