Compressed gas drying apparatus and method

Abstract

The present application relates to compressed gas drying apparatus and method. The compressed gas drying apparatus (1) has: at least two containers containing renewable desiccant, a controllable valve system (7) consisting of a first valve group (8a) and a second valve group (8b), and a first regeneration pipeline (9a) and a second regeneration pipeline (9b), the former is equipped with a heating device (10), the latter discharges saturated regeneration gas, and the two are connected to different valve groups respectively; wherein the first regeneration pipeline (9a) contains an additional container (15) containing renewable desiccant between the exhaust port (13) or the blower (12) and the heating device.

Description

Technical Field

[0001] This invention relates to compressed gas drying equipment.

[0002] More specifically, the present invention aims to improve the efficiency of compressed gas drying equipment so that the equipment is less dependent on environmental parameters and more reliable. Background Technology

[0003] A known compressed gas drying device has an inlet for the compressed gas to be dried and an outlet for the dried compressed gas; wherein the drying device includes at least two containers containing regenerable desiccant and a controllable valve system consisting of a first valve group and a second valve group, the first valve group and the second valve group respectively connecting the inlet and the outlet to the containers; wherein the controllable valve system is configured such that at least one container can dry the compressed gas while another container is being regenerated and cooled, and each container can be sequentially dried by controlling the valve system.

[0004] The regenerable desiccant mentioned in this article refers to a desiccant or hygroscopic agent that can absorb moisture from a gas through adsorption, and when saturated with moisture, it can be dried by passing a so-called regenerated gas through it. This process is also called desiccant regeneration. The regenerated gas is usually a hot gas.

[0005] Although the adsorption principle is mentioned here, this invention is also applicable to the absorption principle.

[0006] When the container is to be dried, it absorbs moisture from the compressed gas being dried, thus saturating the desiccant. This means it will absorb very little moisture or will no longer be able to absorb any more.

[0007] The container is then regenerated by passing regeneration gas (usually a hot gas, such as hot air) through it. This hot gas extracts moisture from the desiccant and regenerates it.

[0008] The container can then be selectively cooled before being used again to dry compressed gas. After regeneration, the desiccant is heated. By first cooling the desiccant in the container before reusing it for drying, the desiccant will be able to extract moisture more effectively.

[0009] In order to provide container regeneration, known equipment is equipped with a first regeneration line for supplying regeneration gas to the container being regenerated and a second regeneration line for discharging saturated regeneration gas. The first regeneration line is equipped with a heating device and is connected to a second valve group. The second regeneration line is connected to the first valve group. The first and second regeneration lines can be connected to the outlet and exhaust port of a blower or similar device for supplying ambient air, respectively, or they can be interchanged.

[0010] When the container is being regenerated, the first regeneration line will be connected to the blower, and the second regeneration line will be connected to the exhaust port.

[0011] The blower will be able to supply ambient air, heat the ambient air through the aforementioned heating device, and then deliver the ambient air to the container being regenerated through the second valve group.

[0012] After passing through the container that is being regenerated, the saturated regeneration air will leave the equipment through the second regeneration line and the exhaust port.

[0013] The regenerated container is then cooled.

[0014] Therefore, the first regeneration line is connected to the exhaust port, and the second regeneration line is connected to the blower.

[0015] The blower will now pass the cooling gas through the second regeneration line, and then through the regenerated container, where the desiccant is cooled by the cooling gas.

[0016] The cooling gas will leave the equipment through the first regeneration pipeline and the exhaust port.

[0017] The disadvantage of such devices is that they require relatively high regeneration gas temperatures and therefore relatively high heating device temperatures, resulting in them consuming relatively more energy.

[0018] This is the result of regeneration using ambient air, which always contains moisture, so regeneration will not be optimal unless the ambient air is heated very strongly.

[0019] In addition, the device relies on environmental parameters because it uses ambient air for regeneration and cooling. Summary of the Invention

[0020] The present invention aims to provide a solution to at least one of the above and other disadvantages.

[0021] This invention relates to a compressed gas drying apparatus having an inlet for compressed gas to be dried and an outlet for dried compressed gas. The apparatus includes at least two containers holding a regenerable desiccant and a controllable valve system consisting of a first valve group and a second valve group, which respectively connect the inlet and outlet to the at least two containers. The controllable valve system is configured such that at least one container can dry the compressed gas while the other container is being regenerated and cooled. The at least two containers can be sequentially dried by controlling the valve system. The apparatus also includes a first regeneration line and a second regeneration line. The first regeneration pipeline is equipped with a heating device and is used to supply regeneration gas to the container being regenerated, and the second regeneration pipeline is used to discharge saturated regeneration gas; wherein the first regeneration pipeline and the second regeneration pipeline are respectively connected to different first valve groups and second valve groups; wherein the first regeneration pipeline and the second regeneration pipeline can be respectively connected to an exhaust port and a blower outlet such as a blower (12) for supplying ambient air, or the second regeneration pipeline and the first regeneration pipeline can be respectively connected to an exhaust port and a blower outlet such as a blower for supplying ambient air; characterized in that an additional container for containing regenerable desiccant is included in the first regeneration pipeline between the exhaust port or the blower and the heating device.

[0022] The advantage is that during the regeneration process of the related container that is being regenerated, ambient air will pass through the additional container and then be heated.

[0023] All ambient moisture will be extracted by a desiccant in an additional container so that regeneration can be performed using this completely dry ambient air. This will ensure more efficient regeneration.

[0024] Another advantage of doing this is that the ambient air does not need to be heated as strongly, which allows the heating device to be set at a lower temperature and to use a lower power, at least temporarily.

[0025] Typically, this would be, for example, a reduction of 30 to 40 degrees Celsius relative to known equipment.

[0026] Therefore, more compact heating devices can also be provided because they require less heating capacity.

[0027] Another advantage is that when the regenerated container is subsequently cooled, the heat from the regenerated container is transferred to the additional container via cooling gas, and the desiccant in the additional container is regenerated in the process.

[0028] In addition, the heat will essentially be temporarily stored in the additional container, which means that the additional container will be heated.

[0029] When the container is regenerated in subsequent cycles, the ambient air drawn in by the blower is not only dried by the additional container but also heated for a period of time. Furthermore, heat is released within this additional container through adsorption. This is also known as "adsorption heat," which is equivalent to condensation heat.

[0030] Typically, this is equivalent to, for example, increasing the temperature by 10°C relative to known equipment.

[0031] For clarity, it is explicitly stated herein that the desiccant in the additional container may be the same as, or may be different from, the desiccant in the at least two containers of the equipment.

[0032] According to one embodiment, a water-resistant desiccant is arranged in the additional container.

[0033] According to a preferred feature of the invention, the internal volume of the additional container is smaller than the internal volume of each of the at least two containers.

[0034] According to one embodiment, the internal volume of the additional container is at most 1 / 3 or 1 / 4 of the internal volume of one of the at least two containers.

[0035] This will ensure that all the desiccant in the auxiliary container is fully regenerated during the cooling process, thus preventing any moisture from remaining in the auxiliary container at the start of the regeneration process.

[0036] According to one embodiment, the additional container is made by extrusion, or the additional container is a tube.

[0037] In one practical embodiment, the additional container is insulated.

[0038] Such insulation can take the form, for example, an insulating coating on the inside and / or outside of the additional container and / or a layer of insulating material encapsulating the additional container.

[0039] The advantage of doing this is that the heat in the additional container is temporarily stopped during the cooling phase so that it can be stored in the best possible way.

[0040] According to one embodiment, the compressed gas drying equipment has a valve device communicating with a first regeneration line and a second regeneration line, and the valve device is configured to allow the first regeneration line and the second regeneration line to be connected to the blower outlet and the exhaust port of a blower, respectively, or to connect the second regeneration line and the first regeneration line to the blower outlet and the exhaust port of a blower, respectively.

[0041] According to one embodiment, the valve device includes one or more of the following:

[0042] Four-way valve;

[0043] Three-way valve;

[0044] Butterfly valve;

[0045] Switch valve.

[0046] According to one embodiment, a first regeneration line is connected to a second valve group, and a second regeneration line is connected to the first valve group.

[0047] According to one embodiment, the compressed gas drying equipment is equipped with a temperature sensor located between the heating device and the container being regenerated.

[0048] According to one embodiment, the compressed gas drying equipment is equipped with a control unit, which controls the heating device based on the temperature measured by a temperature sensor.

[0049] According to one embodiment, the heating device provided with the first regeneration pipeline includes an electric heater, a steam heater, or a heat exchanger contained in the first regeneration pipeline.

[0050] The present invention also relates to a compressed gas drying method, wherein the compressed gas drying method includes the step of passing the compressed gas to be dried through a first regenerable desiccant to extract moisture from the compressed gas to be dried, thereby saturating the first regenerable desiccant with the extracted moisture; wherein the compressed gas drying method further includes the step of regenerating the saturated first regenerable desiccant by passing regenerable gas through the saturated first regenerable desiccant; characterized in that dried and heated ambient air is used as the regenerable gas.

[0051] The advantages of this method are similar to those of the equipment described above. By drying the regenerated gas in addition to heating, the regeneration of the first regenerable desiccant can be performed more effectively, resulting in a lower temperature of the regenerated gas compared to existing methods, without compromising the efficiency of the regeneration process.

[0052] Preferably, in order to dry the ambient air, the ambient air is passed through a second renewable desiccant before passing through a saturated first renewable desiccant, wherein the second renewable desiccant is saturated with moisture extracted from the ambient air.

[0053] Preferably, the compressed gas drying method further includes the step of cooling the regenerated first regenerable desiccant by passing ambient air through it, wherein the ambient air is heated; the compressed gas drying method further includes the step of regenerating the saturated second regenerable desiccant by passing the heated ambient air through it.

[0054] In a practical embodiment, the method is performed using a device according to the present invention. Attached Figure Description

[0055] To better illustrate the features of the present invention, some preferred embodiments of the compressed gas drying apparatus and method according to the present invention are described below by way of non-limiting examples with reference to the accompanying drawings, wherein:

[0056] Figure 1 A compressed gas drying apparatus according to the present invention is schematically shown;

[0057] Figure 2 Show Figure 1 The devices are in different states. Detailed Implementation

[0058] like Figure 1 As shown, the compressed gas drying device 1 includes an inlet 2 for the compressed gas to be dried and an outlet 3 for the dried compressed gas.

[0059] exist Figure 1 In the example, inlet 2 is connected to compressor outlet 4 of compressor 5.

[0060] The compressed gas drying equipment 1 also includes two containers, namely a first container 6a and a second container 6b, which contain a regenerable desiccant.

[0061] The present invention does not exclude the possibility that the compressed gas drying device 1 includes more than two such containers.

[0062] In addition, the compressed gas drying equipment 1 includes a controllable valve system 7 consisting of a first valve group 8a and a second valve group 8b.

[0063] The first valve assembly 8a connects the first container 6a and the second container 6b to the inlet 2 for the compressed gas to be dried, while the second valve assembly 8b connects the first container 6a and the second container 6b to the outlet 3 for the dried compressed gas.

[0064] The first valve group 8a and the second valve group 8b are systems consisting of different pipes and valves that can be controlled to cause at least one container to be regenerated and subsequently cooled, while another container or other containers dry the compressed gas, thereby causing the first container 6a and the second container 6b to dry the compressed gas sequentially via the control valve system 7.

[0065] According to the present invention, the compressed gas drying apparatus 1 further includes a first regeneration line 9a for supplying regeneration gas to the container being regenerated and a second regeneration line 9b for discharging saturated regeneration gas.

[0066] The first regeneration pipeline 9a and the second regeneration pipeline 9b are respectively connected to different first valve groups 8a and second valve groups 8b.

[0067] exist Figure 1In the example shown, the first regeneration line 9a is connected to the second valve group 8b, and the second regeneration line 9b is connected to the first valve group 8a, but they can be reversed.

[0068] The heating device 10 is included in the first regeneration line 9a so as to heat the regeneration gas before it enters and flows through the container being regenerated.

[0069] In this example, the heating device 10 includes an electric heating system, but it is not excluded that the heating device includes a steam heater or heat exchanger contained in the first regeneration line 9a.

[0070] The heating device 10 may also include a heat exchanger that uses the heat of compression from the compressor 5 to heat the regenerated gas.

[0071] Both the first regeneration line 9a and the second regeneration line 9b can be connected to the blower outlet 11 or the exhaust port 13 of the blower 12.

[0072] Blower 12 is capable of drawing in ambient air. Of course, it is not excluded that other devices for drawing in ambient air may be provided instead of blower 12.

[0073] The first regeneration line 9a is connected to the blower outlet 11 of the blower 12, and the second regeneration line 9b is connected to the exhaust port 13; or vice versa, meaning that the second regeneration line 9b is connected to the blower outlet 11 of the blower 12, and the first regeneration line 9a is connected to the exhaust port 13.

[0074] Although a blower 12 and an exhaust port 13, as well as a switching device for switching between the first regeneration line 9a and the second regeneration line 9b, can be provided for each of the first regeneration lines 9a and the second regeneration lines 9b respectively, Figure 1 In the example, a valve device in the form of a four-way valve 14 has been selected for operation to achieve a more compact design.

[0075] However, this compact valve device does not necessarily need to be equipped with a four-way valve 14.

[0076] The valve assembly preferably includes one or more of the following components:

[0077] Four-way valve 14;

[0078] Three-way valve;

[0079] Butterfly valve;

[0080] Switch valve.

[0081] For example, a valve assembly can consist of four separate butterfly valves, four separate on / off valves, or two three-way valves.

[0082] The first regeneration line 9a and the second regeneration line 9b can be connected to the blower outlet 11 and the exhaust port 13 of the blower 12 respectively via the four-way valve 14, or they can be switched.

[0083] For this purpose, one connection point of the four-way valve 14 is connected to the first regeneration line 9a, one connection point is connected to the second regeneration line 9b, one connection point is connected to the exhaust port 13, and one connection point is connected to the blower outlet 11 of the blower 12.

[0084] By switching the four-way valve 14, it is possible to select which of the two regeneration lines, the first regeneration line 9a and the second regeneration line 9b, is connected to the blower outlet 11 of the blower 12, and which is connected to the exhaust port 13.

[0085] Figure 1 The first position of the four-way valve 14 is shown, in which the first regeneration line 9a is connected to the blower outlet 11 of the blower 12.

[0086] The compressed gas drying equipment 1 is configured such that, at this position of the four-way valve 14, the ambient air drawn in by the blower 12 can pass through the four-way valve 14, the first regeneration line 9a, and the second valve group 8b to finally enter the second container 6b that is being regenerated.

[0087] Of course, the valve system 7 is appropriately controlled in this way to achieve a suitable flow path for the ambient air.

[0088] Figure 2 The second position of the four-way valve 14 is shown, in which the first regeneration line 9a is connected to the vent 13.

[0089] The compressed gas drying equipment 1 is configured such that, at this position of the four-way valve 14, ambient air drawn in by the blower 12 can enter the cooling second container 6b through the four-way valve 14, the second regeneration line 9b, and the first valve group 8a.

[0090] Furthermore, the valve system 7 is appropriately controlled in this manner to allow for a proper flow path of ambient air.

[0091] It is also possible to replace the four-way valve 14 with a valve assembly having, for example, four valves, or to use other devices that can achieve the same configuration as the four-way valve 14.

[0092] According to the present invention, the additional container 15 is included in the first regeneration line 9a, located between the exhaust port 13 or the blower 12 and the heating device 10.

[0093] The additional container 15 also contains renewable desiccant.

[0094] In this example, and preferably, a water-resistant desiccant, such as silica gel or activated alumina.

[0095] The advantage of this is that if condensation occurs in the additional container 15, it will not affect the desiccant.

[0096] In this example, the auxiliary container 15 is manufactured, for example, by extruding aluminum. The auxiliary container can also be a tube, for example, particularly a steel tube.

[0097] Since no compressed gas enters the auxiliary container 15, the auxiliary container 15 does not need to be a pressure vessel, but it is not excluded that the auxiliary container 15 is a pressure vessel.

[0098] In addition, in this example, the additional container 15 is enclosed in the insulating material 16 to insulate the additional container.

[0099] Alternatively, the additional container 15 can be insulated by an insulating coating inside and / or outside the additional container 15.

[0100] The internal volume of the supplementary container 15 is preferably smaller than the internal volume of each of the first container 6a and the second container 6b, so that the drying dose in the supplementary container 15 is also smaller than the drying dose in one of the first container 6a and the second container 6b.

[0101] Preferably, the internal volume of the additional container 15 is at most 1 / 3 of the internal volume of one of the two containers, the first container 6a and the second container 6b, or more preferably 1 / 4.

[0102] The preferred maximum size of the additional container 15 will depend on the expected environmental parameters.

[0103] If the relative humidity is 100%, the internal volume of the auxiliary container 15 is preferably 1 / 3 of the internal volume of one of the first container 6a and the second container 6b.

[0104] If the relative humidity is 70%, the internal volume of the auxiliary container 15 is preferably 1 / 4 of the internal volume of one of the first container 6a and the second container 6b.

[0105] In this example, the compressed gas drying equipment 1 is also equipped with a temperature sensor 17 for measuring the temperature at the location between the heating device (e.g., an electric heater) 10 and the inlet of the container being regenerated. Note that "the inlet of the container being regenerated" here refers to the container side where the regenerated gas enters the container.

[0106] exist Figure 1 In the example, the temperature sensor 17 is located in the first regeneration line 9a between the heating device 10 and the second valve group 8b.

[0107] The advantage of this part is that only one temperature sensor 17 needs to be provided. However, temperature sensors 17 can also be provided at the inlet of each of the first container 6a and the second container 6b.

[0108] exist Figure 1 In the example, temperature sensor 17 is arranged between heating device 10 and second valve group 8b, but this is not necessary.

[0109] Finally, the compressed gas drying device 1 in this example is equipped with a control unit 18 for controlling the heating device 10 based on the temperature measured by the temperature sensor 17.

[0110] For this purpose, the control unit 18 is connected to the temperature sensor 17 and the heating device 10.

[0111] The operation of the compressed gas drying equipment 1 is very simple, as described below.

[0112] During the operation of the compressed gas drying equipment 1, the compressed gas to be dried will enter the first container 6a that is being dried through the appropriate control of the inlet 2 and the valve system 7.

[0113] exist Figure 1 and Figure 2 In the example, the first container 6a on the left will dry the compressed gas.

[0114] When the gas passes through the first container 6a on the left, the desiccant will extract moisture from the gas.

[0115] The dried compressed gas will leave the compressed gas drying equipment 1 through outlet 3.

[0116] By appropriately controlling the valve system 7, the appropriate flow path of the compressed gas to be dried is achieved.

[0117] The second container 6b (on the right in this example), which has already dried the gas in the previous cycle or stage, contains moisture and is being regenerated at the same time.

[0118] This article uses a regeneration cycle, which includes heating ambient air, passing it through the relevant second container 6b, and then discharging it.

[0119] Therefore, the four-way valve 14 is switched to the first position, such as... Figure 1 As shown.

[0120] Blower 12 draws in ambient air, which then enters auxiliary container 15 through four-way valve 14.

[0121] Here, the ambient air will be dried and then heated by the heating device 10.

[0122] Based on the measured temperature of the ambient air leaving the auxiliary container 15, the control unit 18 will appropriately control the heating device 10 to bring the ambient air to the required temperature so that the associated second container 6b can be regenerated.

[0123] In this way, the control unit 18 will take into account the fact that the ambient air is already dry, which allows the ambient air to be dried more effectively, so that the temperature does not need to be set as high as that of undried ambient air.

[0124] The dried and heated ambient air will now be guided through the second valve assembly 8b to the right-side second container 6b to regenerate the desiccant in the second container 6b.

[0125] After ambient air passes through the second container 6b, the desiccant in the second container 6b will not only be dried but also heated.

[0126] Then, ambient air will leave the compressed gas drying equipment 1 through the first valve group 8a, the four-way valve 14 and the exhaust port 13.

[0127] Now, the second container 6b on the right has been regenerated, which means that the moisture has been removed from the desiccant and the desiccant has been heated.

[0128] To ensure that the second container 6b can dry the compressed gas in the best way in the next cycle or step, it is first cooled.

[0129] After all, cold desiccants are better at drying than hot desiccants.

[0130] Therefore, switch the four-way valve 14 to the second position, such as... Figure 2 As shown.

[0131] The state or position of valve system 7 remains unchanged, so that the first container 6a on the left can still dry the compressed gas at the same time.

[0132] By switching the four-way valve 14, the ambient air drawn in by the blower 12 will now reach the second container 6b through the first valve group 8a, and heat will be dissipated from the second container 6b.

[0133] The heated ambient air now enters the auxiliary container 15 via the second valve group 8b and the heating device 10.

[0134] Note that the control unit 18 shall turn off the heating device 10 no later than the start of cooling.

[0135] The heated ambient air will now regenerate the auxiliary container 15, meaning that the moisture absorbed from the ambient air in the previous step will be extracted from the auxiliary container 15, and the desiccant will also be heated.

[0136] As a result of this process, the second container 6b on the right will be cooled, and the additional container 15 will be regenerated and heated.

[0137] Because of the provided insulation material 16, all heat will be stored in the additional container 15 in an optimal manner.

[0138] At the end of this cooling step, the desiccant in the first container 6a on the left will be saturated, and the first container will be ready to be regenerated, while the second container 6b on the right is now ready to dry the compressed gas.

[0139] By controlling or switching valve system 7, it can now be ensured that the compressed gas to be dried eventually enters the second container 6b on the right for drying.

[0140] Meanwhile, the first container 6a on the left will be regenerated in the same manner as the previous step.

[0141] In this way, the four-way valve 14 will return to the first position, as follows: Figure 1 As shown.

[0142] Blower 12 draws in ambient air, which eventually enters auxiliary container 15.

[0143] Here, the ambient air is not only dried, but also at least partially heated.

[0144] Therefore, the dried and preheated ambient air will eventually enter the heating device 10 through the first regeneration pipeline 9a.

[0145] The control unit 18 will control the heating device 10 based on the temperature sensor 17.

[0146] Since the ambient air has been preheated, the heating device 10 will not need to be set to an excessively high temperature, and thus the maximum temperature that the heating device 10 must provide will be lower.

[0147] Furthermore, the regeneration and subsequent cooling of the first container 6a are performed in a similar manner to the regeneration and subsequent cooling of the second container 6b on the right side described above.

[0148] After the first container 6a on the left is cooled, the second container 6b on the right will be saturated, and the first and second containers can be swapped again.

[0149] Then, the entire cycle repeats from the beginning.

[0150] Although there are only two containers in the examples shown and described, it cannot be ruled out that there may be more than two containers, in which case at least one container will always be drying the compressed gas.

[0151] For example, there can be six containers, of which three containers will dry the compressed gas, two containers will be regenerated, and one container will be cooled.

[0152] Although temperature sensor 17 is located after heating device 10 in the example shown, it cannot be ruled out that temperature sensor is located elsewhere in the regeneration pipeline.

[0153] The present invention is by no means limited to the embodiments described by way of example and shown in the figures, but can be implemented in various variations according to the invention without departing from the scope of the invention.

Claims

1. A compressed gas drying apparatus (1) having an inlet (2) for a compressed gas to be dried and an outlet (3) for a dried compressed gas. in, The compressed gas drying equipment (1) has at least two containers containing regenerable desiccant and a controllable valve system (7) consisting of a first valve group (8a) and a second valve group (8b), wherein the first valve group connects an inlet (2) to the at least two containers and the second valve group connects an outlet (3) to the at least two containers; The controllable valve system (7) is configured such that at least one container is able to dry compressed gas while another container is being regenerated and cooled, and the control valve system (7) enables the at least two containers to dry compressed gas sequentially. The compressed gas drying equipment (1) is also equipped with a first regeneration pipeline (9a) and a second regeneration pipeline (9b). The first regeneration pipeline is equipped with a heating device (10) and is used to supply regeneration gas to the container being regenerated. The second regeneration pipeline is used to discharge saturated regeneration gas from the container being regenerated. One end of the first regeneration pipeline is connected to the second valve group, and one end of the second regeneration pipeline is connected to the first valve group. The other end of the first regeneration pipeline and the other end of the second regeneration pipeline are connected to a valve device that communicates with the first regeneration pipeline and the second regeneration pipeline. The valve device can switch between a first position and a second position. In the first position, the other end of the second regeneration pipeline can be connected to an exhaust port (13) for discharging saturated regeneration gas from the container being regenerated, and the other end of the first regeneration pipeline can be connected to the blower outlet (11) of a blower (12) for supplying ambient air. In the second position, the other end of the first regeneration pipeline can be connected to the exhaust port (13), and the other end of the second regeneration pipeline can be connected to the blower outlet (11). The feature is that an additional container (15) for containing regenerable desiccant is included in the first regeneration pipeline (9a) between the exhaust port (13) or blower (12) and the heating device (10). In the first position, ambient air drawn in by the blower passes through a valve device, an auxiliary container in the first regeneration pipeline, a heating device in the first regeneration pipeline, and a second valve group, ultimately entering the container being regenerated. It then exits the compressed gas drying equipment through the first valve group, the second regeneration pipeline, the valve device, and the exhaust port. In the second position, ambient air drawn in by the blower passes through a valve device, the second regeneration pipeline, and the first valve group, entering a regenerated and cooling container. It then passes through the second valve group and the heating device in the first regeneration pipeline, entering the auxiliary container in the first regeneration pipeline, and finally exits the compressed gas drying equipment through the valve device and the exhaust port.

2. The compressed gas drying equipment according to claim 1, characterized in that, A water-resistant desiccant is arranged in the additional container (15).

3. The compressed gas drying equipment according to claim 1 or 2, characterized in that, The internal volume of the additional container (15) is less than the internal volume of each of the at least two containers.

4. The compressed gas drying equipment according to claim 3, characterized in that, The internal volume of the additional container (15) is at most 1 / 3 or 1 / 4 of the internal volume of one of the at least two containers.

5. The compressed gas drying equipment according to claim 1, characterized in that, The additional container (15) is made by extrusion, or the additional container is a tube.

6. The compressed gas drying equipment according to claim 1, characterized in that, The additional container (15) is insulated.

7. The compressed gas drying equipment according to claim 1, characterized in that, Valve devices include one or more of the following: Four-way valve (14); Three-way valve; Butterfly valve; Switch valve.

8. The compressed gas drying equipment according to claim 1, characterized in that, The compressed gas drying equipment (1) is equipped with a temperature sensor (17) located between the heating device (10) and the second valve group.

9. The compressed gas drying equipment according to claim 8, characterized in that, The compressed gas drying equipment (1) is equipped with a control unit (18) which controls the heating device (10) based on the temperature measured by the temperature sensor (17).

10. The compressed gas drying equipment according to claim 1, characterized in that, The heating device (10) provided with the first regeneration line (9a) includes an electric heater, a steam heater or a heat exchanger contained in the first regeneration line (9a).

11. A method for drying compressed gas, wherein the method is performed using a compressed gas drying apparatus (1) according to any one of claims 1 to 10, wherein, The compressed gas drying method includes the step of passing the compressed gas to be dried through a first regenerable desiccant to extract moisture from the compressed gas to be dried, thereby saturating the first regenerable desiccant with the extracted moisture; wherein, the compressed gas drying method further includes the step of regenerating the saturated first regenerable desiccant by passing regenerable gas through the saturated first regenerable desiccant; characterized in that dried and heated ambient air is used as the regenerable gas.

12. The compressed gas drying method according to claim 11, characterized in that, In order to dry the ambient air, the ambient air is passed through a second regenerable desiccant before the ambient air passes through a saturated first regenerable desiccant to regenerate the saturated first regenerable desiccant.

13. The compressed gas drying method according to claim 12, characterized in that, The compressed gas drying method further includes the step of cooling the regenerated first regenerable desiccant by passing ambient air through it, wherein the ambient air is heated; the compressed gas drying method further includes the step of regenerating the saturated second regenerable desiccant by passing the heated ambient air through it.

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