Drying system and drying process

Abstract

The application relates to a drying system and a drying process, the drying system comprising: a first adsorption tower, a second adsorption tower, a third adsorption tower, a main cooler and a connecting assembly; the first adsorption tower, the second adsorption tower, the third adsorption tower, the main cooler, a regenerative cooler and a heater are connected with each other through the connecting assembly, the connecting assembly has a raw gas inlet and a finished gas outlet, and the connecting assembly has a first state; when the connecting assembly is in the first state, the raw gas inlet passes through the second adsorption tower, the third adsorption tower, the main cooler, the first adsorption tower and the finished gas outlet in sequence, so that the second adsorption tower and the third adsorption tower are subjected to 'hot blowing' by the raw gas with a higher temperature, the waste heat of the raw gas is fully utilized, the energy consumption for 'hot blowing' of the second adsorption tower and the third adsorption tower is reduced, and therefore the energy consumption of the whole drying system is reduced.

Description

Technical Field

[0001] This application relates to the field of gas drying technology, and in particular to a drying system and drying process. Background Technology

[0002] During the gas drying process, the raw gas with a high temperature has a high amount of residual heat. Therefore, before entering the adsorption tower, the raw gas will pass through a cooler to remove the residual heat and ensure that the temperature of the raw gas entering the adsorption tower is within a certain range. After receiving the residual heat of the raw gas, the cooler often directly discharges it into the atmosphere without effective utilization, thus wasting heat. Summary of the Invention

[0003] Therefore, it is necessary to provide a drying system and drying process to address the problem of the ineffective utilization of the waste heat of the raw material gas.

[0004] A drying system comprising: a first adsorption tower, a second adsorption tower, a third adsorption tower, a main cooler, and a connecting assembly;

[0005] The first adsorption tower, the second adsorption tower, the third adsorption tower, and the main cooler are interconnected via the connecting assembly, which has a raw material gas inlet and a finished product gas outlet, and the connecting assembly has a first state.

[0006] When the connecting component is in the first state, the raw material gas inlet passes sequentially through the second adsorption tower, the third adsorption tower, the main cooler, the first adsorption tower, and the finished product gas outlet.

[0007] In one embodiment, the drying system further includes a regeneration cooler and a heater, which are interconnected with the first adsorption tower, the second adsorption tower, the third adsorption tower and the main cooler via the connecting assembly.

[0008] The connecting component also includes a second state. When the connecting component is in the second state, the gas input from the raw material gas inlet is split by the connecting component to form a first split gas and a second split gas. The first split gas passes sequentially through the heater, the second adsorption tower, the third adsorption tower, and the regeneration cooler. The first split gas and the second split gas that has passed through the main cooler merge and pass sequentially through the first adsorption tower and the finished gas outlet.

[0009] In one embodiment, the connecting component further includes a third state. When the connecting component is in the third state, the raw material gas inlet is connected to the main cooler, and the gas output from the main cooler is split by the connecting component to form a third split gas and a fourth split gas. The third split gas passes through the third adsorption tower, the second adsorption tower and the regeneration cooler in sequence. The third split gas and the fourth split gas merge and pass through the first adsorption tower and the finished gas outlet in sequence.

[0010] In one embodiment, the connection component has a fourth state;

[0011] When the connecting component is in the fourth state, the raw material gas inlet passes sequentially through the first adsorption tower, the third adsorption tower, the main cooler, the second adsorption tower, and the finished product gas outlet.

[0012] In one embodiment, the drying system further includes a regeneration cooler and a heater, and the connection assembly further includes a fifth state;

[0013] When the connecting component is in the fifth state, the gas input from the raw material gas inlet is split into a fifth split gas and a sixth split gas via the connecting component. The fifth split gas passes sequentially through the heater, the first adsorption tower, the third adsorption tower, and the regeneration cooler. The fifth split gas merges with the sixth split gas that has passed through the main cooler and passes sequentially through the second adsorption tower and the finished gas outlet.

[0014] In one embodiment, the connection component further includes a sixth state;

[0015] When the connecting component is in the sixth state, the raw material gas inlet is connected to the main cooler, and the gas output from the main cooler is split by the connecting component to form a seventh split gas and an eighth split gas. The seventh split gas passes through the third adsorption tower, the first adsorption tower and the regeneration cooler in sequence. The seventh split gas and the eighth split gas merge and pass through the second adsorption tower and the finished gas outlet in sequence.

[0016] A drying process based on a drying system, the drying system comprising: a first adsorption tower, a second adsorption tower, a third adsorption tower, a main cooler, a regeneration cooler, a heater, and connecting components;

[0017] The first adsorption tower, the second adsorption tower, the third adsorption tower, the main cooler, the regeneration cooler, and the heater are interconnected via the connecting assembly. The connecting assembly has a raw material gas inlet and a finished product gas outlet, and includes the following steps:

[0018] S1: Raw material gas is introduced through the raw material gas inlet;

[0019] S2: Control the raw material gas inlet to sequentially pass through the second adsorption tower, the third adsorption tower, the main cooler, the first adsorption tower, and the finished product gas outlet, and continue for a first preset time;

[0020] S3: The gas input from the raw material gas inlet is controlled to be split into a first split gas and a second split gas via a connecting component. The first split gas passes sequentially through the heater, the second adsorption tower, the third adsorption tower, and the regeneration cooler. The first split gas and the second split gas passing through the main cooler merge and pass sequentially through the first adsorption tower and the finished gas outlet for a second preset time.

[0021] S4: Control the raw material gas inlet to be connected to the main cooler, and the gas output from the main cooler is split into a third split gas and a fourth split gas through the connecting component. The third split gas passes through the third adsorption tower and the second adsorption tower in sequence. The third split gas and the fourth split gas merge and pass through the first adsorption tower and the finished gas outlet in sequence, and continue for a third preset time.

[0022] In one embodiment, the drying process further includes the following steps:

[0023] S5: Control the raw material gas inlet to sequentially pass through the heater, the first adsorption tower, the third adsorption tower, the main cooler, the second adsorption tower, and the finished product gas outlet, and continue for a fifth preset time;

[0024] S6: The gas input from the raw material gas inlet is controlled to be split into a fifth split gas and a sixth split gas via a connecting component. The fifth split gas passes sequentially through the heater, the first adsorption tower, the third adsorption tower, and the regeneration cooler. The fifth split gas merges with the sixth split gas that has passed through the main cooler and passes sequentially through the second adsorption tower and the finished gas outlet for a sixth preset time.

[0025] S7: Control the raw material gas inlet to be connected to the main cooler 13, and the gas output from the main cooler is split into a seventh split gas and an eighth split gas through the connecting component. The seventh split gas passes through the heater, the third adsorption tower and the first adsorption tower in sequence. The seventh split gas and the eighth split gas merge and pass through the second adsorption tower and the finished gas outlet in sequence.

[0026] In one embodiment, in step S1 or step S5, the temperature of the raw material gas input into the raw material gas inlet is between 90°C and 200°C.

[0027] In one embodiment, in step S2, the temperature of the first split gas passing through the heater is 220°C-300°C;

[0028] And / or, in step S6, the temperature of the fifth split gas passing through the heater is between 220°C and 300°C.

[0029] In the aforementioned drying system, when the temperature of the raw gas input at the raw gas inlet is high, it is not necessary to first input the raw gas into the main cooler. Instead, it is directly input into the second and third adsorption towers to "hot-blow" the second and third adsorption towers with the high-temperature raw gas. This fully utilizes the waste heat of the raw gas, reduces the energy consumption of "hot-blowing" the second and third adsorption towers, and thus reduces the energy consumption of the entire drying system. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the connecting components in the drying system in the first state in some embodiments of this application.

[0031] Figure 2 This is a schematic diagram of the structure of the connecting component in the drying system in the second state in some embodiments of this application.

[0032] Figure 3 This is a schematic diagram of the structure of the connecting component in the drying system in the third state in some embodiments of this application.

[0033] Figure 4 This is a schematic diagram of the structure of the connecting component in the drying system in the fourth state in some embodiments of this application.

[0034] Figure 5 This is a schematic diagram of the structure of the connecting component in the drying system in the fifth state in some embodiments of this application.

[0035] Figure 6 This is a schematic diagram of the structure of the connecting component in the drying system in the sixth state in some embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] First adsorption tower 10; Second adsorption tower 11; Third adsorption tower 12; Main cooler 13; Regeneration cooler 14; Heater 15; Raw material gas inlet 16; Finished product gas outlet 17;

[0038] Connection assembly 20; First shut-off valve 21; Second shut-off valve 22; Third shut-off valve 23; Fourth shut-off valve 24; Fifth shut-off valve 25; Sixth shut-off valve 26; Seventh shut-off valve 27; Eighth shut-off valve 28; Ninth shut-off valve 29; Tenth shut-off valve 30; Eleventh shut-off valve 31; Twelfth shut-off valve 32; Thirteenth shut-off valve 33; Fourteenth shut-off valve 34; Fifteenth shut-off valve 35; Sixteenth shut-off valve 36; Seventeenth shut-off valve 37; Eighteenth shut-off valve 38; Nineteenth shut-off valve 39; Twentieth shut-off valve 40. Detailed Implementation

[0039] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0040] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] See Figure 1 , Figure 1 A schematic diagram of the drying system according to an embodiment of this application is shown, wherein, Figure 1 The thicker lines represent the path of the raw material gas, as shown below. Figures 2-6 Similarly, a drying system provided in one embodiment of this application includes a first adsorption tower 10, a second adsorption tower 11, a third adsorption tower 12, a main cooler 13, a heater 15, and a connecting assembly 20. The first adsorption tower 10, the second adsorption tower 11, the third adsorption tower 12, the main cooler 13, the regeneration cooler 14, and the heater 15 are interconnected via the connecting assembly 20, which has a raw material gas inlet 16 and a finished product gas outlet 17.

[0046] The first adsorption tower 10 and the second adsorption tower 11 can be of the same type, mainly utilizing the selective physical adsorption of water vapor by porous adsorbents such as activated alumina and molecular sieves. Specifically, when the raw gas input into the raw gas inlet 16 flows from bottom to top through the first adsorption tower 10 or the second adsorption tower 11, water molecules are trapped on the surface of the adsorbent due to polarity and capillary force of micropores. The dry gas is discharged from the top of the first adsorption tower 10 or the second adsorption tower 11 and finally input into the downstream equipment through the finished gas outlet 17.

[0047] By setting up a first adsorption tower 10 and a second adsorption tower 11, one can operate while the other is regenerated. Specifically, taking the first adsorption tower 10 as an example, when the adsorbent in the first adsorption tower 10 becomes saturated due to continuous operation, the second adsorption tower 11 can be switched on to regenerate the adsorbent in the first adsorption tower 10. This process continues until the adsorbent in the second adsorption tower 11 becomes saturated, at which point the first adsorption tower 10 is switched back on to operate, and the second adsorption tower 11 is regenerated again. In this way, the first adsorption tower 10 and the second adsorption tower 11 operate alternately, ensuring the working efficiency of the drying system.

[0048] The regeneration of the first adsorption tower 10 or the second adsorption tower 11 mainly involves "hot blowing" followed by "cold blowing." Hot blowing utilizes heated regeneration gas, which passes through the saturated bed of the first adsorption tower 10 or the second adsorption tower 11 in either the forward or reverse direction. The increased temperature causes water molecules in the adsorbent to desorb, and the desorbed water is carried away to the outside by the regeneration gas. Cold blowing, on the other hand, involves stopping heating after hot blowing and using dry gas at room temperature or slightly heated to continue blowing through the bed, reducing the adsorbent temperature from over 200 degrees Celsius to near the operating temperature, thus achieving bed cooling and resetting.

[0049] The function of the third adsorption tower 12 is to receive residual water vapor from the outlet of the first adsorption tower 10 or the second adsorption tower 11, or instantaneous through water in the event of switching between the first adsorption tower 10 and the second adsorption tower 11, incomplete regeneration, or fluctuations in incoming gas, so as to ensure that downstream cryogenic, catalytic, or precision instrumentation processes are not affected by trace amounts of water.

[0050] The connecting component 20 has the function of adjusting the internal raw material gas flow path. This includes, but is not limited to, using solenoid valves, regulating valves, shut-off valves, etc., to allow the raw material gas to pass through different devices in the drying system to achieve different processes. For example, by changing the state of the connecting component 20, the drying system can switch between flowing through the first adsorption tower 10 or the second adsorption tower 11, so that the first adsorption tower 10 or the second adsorption tower 11 can switch between working and regenerating.

[0051] In actual use, if the temperature of the raw gas input through the raw gas inlet 16 is high, it needs to be controlled to pass through a cooler first, so that the temperature of the raw gas can reach the process temperature of the first adsorption tower 10 or the second adsorption tower 11 when it enters. This results in energy waste. Especially for the raw gas formed after the upstream gas has been compressed, its temperature can reach 90~200℃.

[0052] Therefore, the connecting assembly 20 includes a first state. When the connecting assembly 20 is in the first state, the raw material gas inlet 16 sequentially passes through the second adsorption tower 11, the third adsorption tower 12, the main cooler 13, the first adsorption tower 10, and the finished gas outlet 17. In this way, the raw material gas with high heat all enters the second adsorption tower 11. Because the raw material gas itself has a high temperature, it can achieve "heat blowing" of the second adsorption tower 11 when passing through it. That is, the heat of the raw material gas itself is used to desorb water molecules from the adsorbent in the second adsorption tower 11, thus completing the "heat blowing" of the second adsorption tower 11.

[0053] The raw material gas discharged from the second adsorption tower 11 continues to enter the third adsorption tower 12, thus completing the hot blowing of the third adsorption tower 12. The principle of the "hot blowing" of the third adsorption tower 12 is the same as that of the "hot blowing" of the second adsorption tower 11, and will not be repeated here. The raw material gas discharged from the third adsorption tower 12 is in a high temperature and high humidity state because it has adsorbed the moisture in the second adsorption tower 11. Then the raw material gas will be cooled by the main cooler 13, so that the raw material gas can be condensed by the main cooler 13, and the moisture in the raw material gas can be initially separated. Finally, the raw material gas enters the first adsorption tower 10, which is in operation, and completes the adsorption and drying in the first adsorption tower 10 to form the finished gas that meets the process requirements. The finished gas is input to the downstream equipment through the finished gas outlet 17.

[0054] In the aforementioned drying system, when the temperature of the raw gas input at the raw gas inlet 16 is high, it is not necessary to first input the raw gas into the main cooler 13. Instead, the raw gas is directly input into the second adsorption tower 11 and the third adsorption tower 12. This allows the high-temperature raw gas to "hot-blow" the second adsorption tower 11 and the third adsorption tower 12, making full use of the waste heat of the raw gas and reducing the energy consumption of "hot-blowing" the second adsorption tower 11 and the third adsorption tower 12, thereby reducing the energy consumption of the entire drying system.

[0055] In some embodiments of this application, the drying system further includes a regeneration cooler 14 and a heater 15, which are interconnected with the first adsorption tower 10, the second adsorption tower 11, the third adsorption tower 12, and the main cooler 13 via a connecting assembly 20; the connecting assembly 20 also includes a second state, when the connecting assembly 20 is in the second state, see [reference needed]. Figure 2 The gas input from the raw material gas inlet 16 is split into a first split gas and a second split gas via the connecting component 20. The first split gas passes through the heater 15, the second adsorption tower 11, the third adsorption tower 12, and the regeneration cooler 14 in sequence. The first split gas and the second split gas passing through the main cooler 13 merge and pass through the first adsorption tower 10 and the finished gas outlet 17 in sequence.

[0056] In actual use, although the raw material gas can be used to heat the second adsorption tower 11 and the third adsorption tower 12 at full flow in the first state, the adsorbent cannot be completely regenerated due to the limitation of the raw material gas temperature itself, namely 90℃-200℃ mentioned above.

[0057] Therefore, after switching the connection component 20 to the first state for a period of time, the connection component 20 can be switched to the second state, so that the raw material gas is split into a first split gas and a second split gas. The first split gas is heated by the heating element so that the temperature of the first split gas can reach 220℃-300℃. Then the first split gas is input into the second adsorption tower 11 and the third adsorption tower 12, thereby meeting the requirement of complete regeneration of the adsorbent in the second adsorption tower 11 and the third adsorption tower 12.

[0058] After the first split gas regenerates the adsorbent in the second adsorption tower 11 and the third adsorption tower 12, it passes through the regeneration cooler 14 to cool down. At the same time, the second split gas also passes through the main cooler 13 for cooling. After the first and second split gases are cooled down, they are combined and fed into the first adsorption tower 10 to complete the final adsorption and drying to form the finished gas that meets the process requirements. The finished gas is fed into the downstream equipment through the finished gas outlet 17.

[0059] The reason for splitting the raw material gas into a first split gas and a second split gas is to avoid excessively high temperatures inside the second adsorption tower 11 and the third adsorption tower 12 during "hot blowing," which could lead to high-temperature deactivation or pulverization of the adsorbent. Optionally, the first split gas accounts for 20% of the raw material gas input into the raw material gas inlet 16, while the second split gas accounts for 80% of the raw material gas input into the raw material gas inlet 16.

[0060] In some implementations, after the "hot blowing" of the second adsorption tower 11 and the third adsorption tower 12 is completed, it is also necessary to "cold blow" the second adsorption tower 11 and the third adsorption tower 12. For this purpose, the connecting assembly 20 also includes a third state, see [link to documentation]. Figure 3 When the connecting component 20 is in the third state, the raw material gas inlet 16 is connected to the main cooler 13, and the gas output from the main cooler 13 is split into a third split gas and a fourth split gas through the connecting component 20. The third split gas passes through the heater 15, the third adsorption tower 12, and the second adsorption tower 11 in sequence. The third split gas and the fourth split gas merge and pass through the first adsorption tower 10 and the finished gas outlet 17 in sequence.

[0061] During the "cold blowing" process of the second adsorption tower 11 and the third adsorption tower 12, the input raw material gas is first cooled by a cooler. After the raw material gas is cooled and moisture is separated, 20% of the raw material gas flow rate is diverted as the third diverted gas and enters the third adsorption tower 12 and the second adsorption tower 11. The cold blowing process requires the flow direction to be opposite to that of the hot blowing process. Therefore, during hot blowing, the raw material gas enters from the bottom of the second adsorption tower 11 and exits from the bottom of the third adsorption tower 12, while during cold blowing, the raw material gas enters from the bottom of the third adsorption tower 12 and exits from the bottom of the second adsorption tower 11.

[0062] The third diverted gas flowing out from the bottom of the second adsorption tower 11 still has a high temperature and humidity. Therefore, after the third diverted gas passes through the regeneration cooler 14, the temperature of the third diverted gas is cooled and the moisture is separated. Then, it is fed into the first adsorption tower 10 together with the remaining 80% of the fourth diverted gas to complete the final adsorption and drying to form a finished gas that meets the process requirements. The finished gas is fed into the downstream equipment through the finished gas outlet 17.

[0063] Thus, by sequentially switching the connecting component 20 to the first state, the second state, and the third state, the regeneration of the second adsorption tower 11 can be completed, while the first adsorption tower 10 remains in operation throughout this process. After the regeneration of the second adsorption tower 11 is completed, the first adsorption tower 10 can be regenerated, at which point the second adsorption tower 11 can be controlled to remain in operation.

[0064] Therefore, in some embodiments of this application, the connection component 20 has a fourth state, see [reference]. Figure 4 When the connecting assembly 20 is in the fourth state, the raw material gas inlet 16 sequentially passes through the first adsorption tower 10, the third adsorption tower 12, the main cooler 13, the second adsorption tower 11, and the finished gas outlet 17. At this time, the first adsorption tower 10 undergoes "hot blowing" with the full flow of high-temperature raw material gas, while the second adsorption tower 11 acts as the main adsorption device to dry and adsorb the raw material gas. The specific working process can be referred to the discussion when the connecting assembly 20 is in the first state, and will not be repeated here.

[0065] Furthermore, to perform "hot blowing" on the first adsorption tower 10 at full flow, it is necessary to perform hot blowing on the first adsorption tower 10 by diversion. For this purpose, the connecting assembly 20 also includes a fifth state, see [link to documentation]. Figure 5 When the connecting assembly 20 is in the fifth state, the gas input from the raw material gas inlet 16 is split into a fifth split gas and a sixth split gas via the connecting assembly 20. The fifth split gas passes sequentially through the heater 15, the first adsorption tower 10, the third adsorption tower 12, and the regeneration cooler 14. The fifth split gas merges with the sixth split gas that has passed through the main cooler 13 and passes sequentially through the second adsorption tower 11 and the finished gas outlet 17. The specific working process of the split gas hot blowing on the first adsorption tower 10 can be referred to the discussion when the connecting assembly 20 is in the second state, and will not be repeated here.

[0066] Finally, after hot blowing the first adsorption tower 10, cold blowing is required. For this purpose, the connecting assembly 20 also includes a sixth state, see [link to documentation]. Figure 6 When the connecting component 20 is in the sixth state, the raw material gas inlet 16 is connected to the main cooler 13, and the gas output from the main cooler 13 is split into a seventh split gas and an eighth split gas via the connecting component 20. The seventh split gas passes sequentially through the third adsorption tower 12, the first adsorption tower 10, and the regeneration cooler 14. The seventh split gas and the eighth split gas then merge and pass sequentially through the second adsorption tower 11 and the finished gas outlet 17. The specific working process of the split gas for cold blowing the first adsorption tower 10 can be referred to the discussion when the connecting component 20 is in the third state, and will not be repeated here.

[0067] In some embodiments of this application, in order to enable the connection component 20 to switch between the aforementioned states, the connection component 20 includes a first shut-off valve 21, a second shut-off valve 22, a third shut-off valve 23, a fourth shut-off valve 24, a fifth shut-off valve 25, a sixth shut-off valve 26, a seventh shut-off valve 27, an eighth shut-off valve 28, a ninth shut-off valve 29, a tenth shut-off valve 30, an eleventh shut-off valve 31, a twelfth shut-off valve 32, a thirteenth shut-off valve 33, a fourteenth shut-off valve 34, a fifteenth shut-off valve 35, a sixteenth shut-off valve 36, a seventeenth shut-off valve 37, an eighteenth shut-off valve 38, a nineteenth shut-off valve 39, and a twentieth shut-off valve 40.

[0068] The first shut-off valve 21 is connected to the first adsorption tower 10 and the finished gas outlet 17. The second shut-off valve 22 is connected to the first adsorption tower 10 and the third adsorption tower 12. The third shut-off valve 23 is connected to the first adsorption tower 10 and the heater 15. One end of the fourth shut-off valve 24 is connected to the first adsorption tower 10, and the other end is connected to the fourteenth shut-off valve 34 and the fifteenth shut-off valve 35. One end of the fifth shut-off valve 25 is connected to the first adsorption tower 10, and the other end is connected to the nineteenth shut-off valve 39 and the twentieth shut-off valve 40.

[0069] The sixth shut-off valve 26 is connected to the second adsorption tower 11 and the finished gas outlet 17. The seventh shut-off valve 27 is connected to the second adsorption tower 11 and the third adsorption tower 12. The eighth shut-off valve 28 is connected to the second adsorption tower 11 and the heater 15. One end of the ninth shut-off valve 29 is connected to the second adsorption tower 11, and the other end is connected to the fourteenth shut-off valve 34 and the fifteenth shut-off valve 35. One end of the tenth shut-off valve 30 is connected to the first adsorption tower 10, and the other end is connected to the nineteenth shut-off valve 39 and the twentieth shut-off valve 40.

[0070] The eleventh shut-off valve 31 is connected to the third adsorption tower 12 and the heater 15 via a pipeline. One end of the twelfth shut-off valve 32 is connected to the third adsorption tower 12 via a pipeline, and the other end is connected to the fourteenth shut-off valve 34 and the fifteenth shut-off valve 35 via a pipeline. One end of the thirteenth shut-off valve 33 is connected to the heater 15 via a pipeline, and the other end is connected to the seventeenth shut-off valve 37 and the eighteenth shut-off valve 38 via a pipeline.

[0071] The pipeline of the fourteenth shut-off valve 34 is connected to the fourth shut-off valve 24 and the regeneration cooler 14. One end of the pipeline of the fifteenth shut-off valve 35 is connected to the fourth shut-off valve 24, the ninth shut-off valve 29, the twelfth shut-off valve 32 and the fourteenth shut-off valve 34, and the other end is connected to the main cooler 13. One end of the sixteenth shut-off valve 36 is connected to the fifteenth shut-off valve 35 and the regeneration cooler 14, and the other end is connected to the raw material gas inlet 16 and the seventeenth shut-off valve 37.

[0072] One end of the seventeenth shut-off valve 37 is connected to the sixteenth shut-off valve 36 and the raw material gas inlet 16, and the other end is connected to the thirteenth shut-off valve 33 and the eighteenth shut-off valve 38. One end of the eighteenth shut-off valve 38 is connected to the thirteenth shut-off valve 33 and the seventeenth shut-off valve 37, and the other end is connected to the main cooler 13 and the twentieth shut-off valve 40. One end of the nineteenth shut-off valve 39 is connected to the regeneration cooler 14, and the other end is connected to the fifth shut-off valve 25, the tenth shut-off valve 30, and the twentieth shut-off valve 40. One end of the twentieth shut-off valve 40 is connected to the main cooler 13, and the other end is connected to the fifth shut-off valve 25, the tenth shut-off valve 30, the twentieth shut-off valve 40, and the nineteenth shut-off valve 39.

[0073] Based on the above-mentioned shut-off valves, when the connecting pipeline is in the first state, the second shut-off valve 22, the third shut-off valve 23, the fourth shut-off valve 24, the sixth shut-off valve 26, the ninth shut-off valve 29, the tenth shut-off valve 30, the eleventh shut-off valve 31, the fourteenth shut-off valve 34, the sixteenth shut-off valve 36, the eighteenth shut-off valve 38, and the nineteenth shut-off valve 39 are in the closed state, and the remaining shut-off valves are in the open state.

[0074] When the connecting pipeline is in the second state, the second shut-off valve 22, the third shut-off valve 23, the fourth shut-off valve 24, the sixth shut-off valve 26, the ninth shut-off valve 29, the tenth shut-off valve 30, the eleventh shut-off valve 31, the fifteenth shut-off valve 35 and the eighteenth shut-off valve 38 are in the closed state, and the remaining shut-off valves are in the open state.

[0075] When the connecting pipe is in the third state, the second shut-off valve 22, the third shut-off valve 23, the fourth shut-off valve 24, the sixth shut-off valve 26, the eighth shut-off valve 28, the ninth shut-off valve 29, the tenth shut-off valve 30, the twelfth shut-off valve 32, the fifteenth shut-off valve 35 and the seventeenth shut-off valve 37 are in the closed state, and the remaining shut-off valves are in the open state.

[0076] When the connecting pipeline is in the fourth state, the first shut-off valve 21, the fourth shut-off valve 24, the fifth shut-off valve 25, the seventh shut-off valve 27, the eighth shut-off valve 28, the ninth shut-off valve 29, the eleventh shut-off valve 31, the fourteenth shut-off valve 34, the sixteenth shut-off valve 36, the eighteenth shut-off valve 38, and the nineteenth shut-off valve 39 are in the closed state, and the remaining shut-off valves are in the open state.

[0077] When the connecting pipeline is in the fifth state, the first stop valve 21, the fourth stop valve 24, the fifth stop valve 25, the seventh stop valve 27, the eighth stop valve 28, the ninth stop valve 29, the eleventh stop valve 31, the fifteenth stop valve 35 and the eighteenth stop valve 38 are in the closed state, and the remaining stop valves are in the open state.

[0078] When the connecting pipeline is in the sixth state, the third stop valve 23, the fifth stop valve 25, the seventh stop valve 27, the eighth stop valve 28, the ninth stop valve 29, the twelfth stop valve 32, the fifteenth stop valve 35, and the seventeenth stop valve 37 are in the closed state, and the remaining stop valves are in the open state.

[0079] It should be noted that when the connecting pipe is in the first, third, fourth, and sixth states, although the raw material gas passes through the heater 15, the heater 15 is not operational and is only used as a connecting channel. However, when the connecting pipe is in the second and fifth states, the heater 15 needs to heat the raw material gas passing through it to meet process requirements.

[0080] This application also provides a drying process based on a drying system, which includes: a first adsorption tower 10, a second adsorption tower 11, a third adsorption tower 12, a main cooler 13, a regeneration cooler 14, a heater 15, and a connecting assembly 20; the first adsorption tower 10, the second adsorption tower 11, the third adsorption tower 12, the main cooler 13, the regeneration cooler 14, and the heater 15 are interconnected by the connecting assembly 20, and the connecting assembly 20 has a raw material gas inlet 16 and a finished product gas outlet 17.

[0081] The drying process includes the following steps:

[0082] S1: Raw material gas is introduced via raw material gas inlet 16;

[0083] S2: Control the raw material gas inlet 16 to pass sequentially through the second adsorption tower 11, the third adsorption tower 12, the main cooler 13, the first adsorption tower 10 and the finished gas outlet 17, and continue for a first preset time;

[0084] S3: The gas input from the raw material gas inlet 16 is split into a first split gas and a second split gas via the connecting component 20. The first split gas passes through the heater 15, the second adsorption tower 11, the third adsorption tower 12, and the regeneration cooler 14 in sequence. The first split gas and the second split gas passing through the main cooler 13 merge and pass through the first adsorption tower 10 and the finished gas outlet 17 in sequence, and continue for a second preset time.

[0085] S4: Control the raw material gas inlet 16 to be connected to the main cooler 13, and the gas output from the main cooler 13 is split into a third split gas and a fourth split gas through the connecting component 20. The third split gas passes through the third adsorption tower 12, the second adsorption tower 11 and the regeneration cooler 14 in sequence. The third split gas and the fourth split gas merge and pass through the first adsorption tower 10 and the finished gas outlet 17 in sequence, and continue for a third preset time.

[0086] After steps S2, S3 and S4, the regeneration of the second adsorption tower 11 can be completed. Step S2 can be referred to the above description of the connecting component 20 in the first state, step S3 can be referred to the above description of the connecting component 20 in the second state, and step S4 can be referred to the above description of the connecting component 20 in the third state.

[0087] Furthermore, the drying process also includes the following steps after step S4:

[0088] S5: Control the raw material gas inlet 16 to pass sequentially through heater 15, first adsorption tower 10, third adsorption tower 12, main cooler 13, second adsorption tower 11 and finished gas outlet 17, and continue for a fifth preset time.

[0089] S6: The gas input from the raw material gas inlet 16 is split into a fifth split gas and a sixth split gas via the connecting component 20. The fifth split gas passes through the heater 15, the first adsorption tower 10, the third adsorption tower 12, and the regeneration cooler 14 in sequence. The fifth split gas merges with the sixth split gas that has passed through the main cooler 13 and passes through the second adsorption tower 11 and the finished gas outlet 17 in sequence, and continues for a sixth preset time.

[0090] S7: Control the raw material gas inlet 16 to be connected to the main cooler 13, and the gas output from the main cooler 13 is split into the seventh split gas and the eighth split gas through the connecting component 20. The seventh split gas passes through the heater 15, the third adsorption tower 12 and the first adsorption tower 10 in sequence. The seventh split gas and the eighth split gas merge and pass through the second adsorption tower 11 and the finished gas outlet 17 in sequence.

[0091] After steps S5, S6 and S7, the regeneration of the second adsorption tower 11 can be completed. Specifically, step S5 can be referred to the above description of the connecting component 20 in the fourth state, step S6 can be referred to the above description of the connecting component 20 in the second state, and step S7 can be referred to the above description of the connecting component 20 in the third state.

[0092] In order to enable the raw material gas to achieve heat blowing on the first adsorption tower 10 or the second adsorption tower 11, in step S1, the temperature of the raw material gas input into the raw material gas inlet 16 is 90℃-200℃, so that the residual heat of the raw material gas can be used to achieve heat blowing on the second adsorption tower 11 in step S1. At the same time, in step S5, the temperature of the raw material gas input into the raw material gas inlet 16 is 90℃-200℃, so that the residual heat of the raw material gas can be used to achieve heat blowing on the second adsorption tower 11 in step S5.

[0093] Furthermore, to ensure that the temperature of the gas after diversion is sufficient for hot blowing of the first adsorption tower 10 or the second adsorption tower 11, in step S2, the temperature of the first diverted gas passing through the heater 15 is 220℃-300℃ to complete the complete regeneration of the second adsorption tower 11. Even further, in step S6, the temperature of the fifth diverted gas passing through the heater 15 is 220℃-300℃ to complete the complete regeneration of the first adsorption tower 10.

[0094] The above drying process has at least the following advantages:

[0095] When the temperature of the raw gas input into the raw gas inlet 16 is high, it is not necessary to input the raw gas into the main cooler 13 first. Instead, it is directly input into the second adsorption tower 11 and the third adsorption tower 12. The second adsorption tower 11 and the third adsorption tower 12 are "hot-blown" by the high-temperature raw gas, making full use of the waste heat of the raw gas and reducing the energy consumption of the second adsorption tower 11 and the third adsorption tower 12, thereby reducing the energy consumption of the entire drying system.

[0096] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A drying system, characterized in that, The drying system includes: a first adsorption tower (10), a second adsorption tower (11), a third adsorption tower (12), a main cooler (13), and a connecting assembly (20). The first adsorption tower (10), the second adsorption tower (11), the third adsorption tower (12), and the main cooler (13) are interconnected by the connecting assembly (20), which has a raw material gas inlet (16) and a finished product gas outlet (17). The connecting assembly (20) has a first state. When the connecting component (20) is in the first state, the raw material gas inlet (16) passes through the second adsorption tower (11), the third adsorption tower (12), the main cooler (13), the first adsorption tower (10), and the finished gas outlet (17) in sequence.

2. The drying system according to claim 1, characterized in that, The drying system further includes a regeneration cooler (14) and a heater (15), which are interconnected with the first adsorption tower (10), the second adsorption tower (11), the third adsorption tower (12) and the main cooler (13) via the connecting assembly (20); The connecting component (20) also includes a second state. When the connecting component (20) is in the second state, the gas input from the raw material gas inlet (16) is split by the connecting component (20) to form a first split gas and a second split gas. The first split gas passes through the heater (15), the second adsorption tower (11), the third adsorption tower (12), and the regeneration cooler (14) in sequence. The first split gas and the second split gas that has passed through the main cooler (13) merge and pass through the first adsorption tower (10) and the finished gas outlet (17) in sequence.

3. The drying system according to claim 2, characterized in that, The connecting component (20) also includes a third state. When the connecting component (20) is in the third state, the raw material gas inlet (16) is connected to the main cooler (13), and the gas output by the main cooler (13) is split into a third split gas and a fourth split gas through the connecting component (20). The third split gas passes through the third adsorption tower (12), the second adsorption tower (11) and the regeneration cooler (14) in sequence. The third split gas and the fourth split gas merge and pass through the first adsorption tower (10) and the finished gas outlet (17) in sequence.

4. The drying system according to claim 1, characterized in that, The connection component (20) has a fourth state; When the connecting component (20) is in the fourth state, the raw material gas inlet (16) passes sequentially through the first adsorption tower (10), the third adsorption tower (12), the main cooler (13), the second adsorption tower (11), and the finished gas outlet (17).

5. The drying system according to claim 4, characterized in that, The drying system also includes a regenerative cooler (14) and a heater (15), and the connection assembly (20) also includes a fifth state; When the connecting component (20) is in the fifth state, the gas input from the raw material gas inlet (16) is split into a fifth split gas and a sixth split gas via the connecting component (20). The fifth split gas passes through the heater (15), the first adsorption tower (10), the third adsorption tower (12), and the regeneration cooler (14) in sequence. The fifth split gas merges with the sixth split gas that has passed through the main cooler (13) and passes through the second adsorption tower (11) and the finished gas outlet (17) in sequence.

6. The drying system according to claim 5, characterized in that, The connection component (20) also includes a sixth state; When the connecting component (20) is in the sixth state, the raw material gas inlet (16) is connected to the main cooler (13), and the gas output from the main cooler (13) is split into a seventh split gas and an eighth split gas via the connecting component (20). The seventh split gas passes through the third adsorption tower (12), the first adsorption tower (10) and the regeneration cooler (14) in sequence. The seventh split gas and the eighth split gas merge and pass through the second adsorption tower (11) and the finished gas outlet (17) in sequence.

7. A drying process based on a drying system, said drying system comprising: The first adsorption tower (10), the second adsorption tower (11), the third adsorption tower (12), the main cooler (13), the regeneration cooler (14), the heater (15), and the connecting assembly (20). The first adsorption tower (10), the second adsorption tower (11), the third adsorption tower (12), the main cooler (13), the regeneration cooler (14), and the heater (15) are interconnected by the connecting assembly (20). The first adsorption tower (10), the second adsorption tower (11), the third adsorption tower (12), the main cooler (13), the regeneration cooler (14), and the heater (15) are interconnected by the connecting assembly (20). The connecting assembly (20) has a raw material gas inlet (16) and a finished product gas outlet (17). The drying process includes the following steps: S1: Raw material gas is introduced through the raw material gas inlet (16); S2: Control the raw material gas inlet (16) to pass sequentially through the second adsorption tower (11), the third adsorption tower (12), the main cooler (13), the first adsorption tower (10) and the finished gas outlet (17) for a first preset time; S3: The gas input from the raw material gas inlet (16) is split into a first split gas and a second split gas via the connecting component (20). The first split gas passes through the heater (15), the second adsorption tower (11), the third adsorption tower (12), and the regeneration cooler (14) in sequence. The first split gas and the second split gas passing through the main cooler (13) merge and pass through the first adsorption tower (10) and the finished gas outlet (17) in sequence for a second preset time. S4: Control the raw material gas inlet (16) to be connected to the main cooler (13), and the gas output by the main cooler (13) is split into a third split gas and a fourth split gas via the connecting component (20). The third split gas passes through the third adsorption tower (12) and the second adsorption tower (11) in sequence. The third split gas and the fourth split gas merge and pass through the first adsorption tower (10) and the finished gas outlet (17) in sequence, and continue for a third preset time.

8. The drying process according to claim 7, characterized in that, The drying process also includes the following steps: S5: Control the raw material gas inlet (16) to pass sequentially through the heater (15), the first adsorption tower (10), the third adsorption tower (12), the main cooler (13), the second adsorption tower (11) and the finished gas outlet (17), and continue for a fifth preset time; S6: The gas input from the raw material gas inlet (16) is split into a fifth split gas and a sixth split gas via the connecting component (20). The fifth split gas passes through the heater (15), the first adsorption tower (10), the third adsorption tower (12), and the regeneration cooler (14) in sequence. The fifth split gas merges with the sixth split gas that has passed through the main cooler (13) and passes through the second adsorption tower (11) and the finished gas outlet (17) in sequence, and continues for a sixth preset time. S7: Control the raw material gas inlet (16) to be connected to the main cooler (13), and the gas output from the main cooler (13) is split into a seventh split gas and an eighth split gas via the connecting component (20). The seventh split gas passes through the heater (15), the third adsorption tower (12), and the first adsorption tower (10) in sequence. The seventh split gas and the eighth split gas merge and pass through the second adsorption tower (11) and the finished gas outlet (17) in sequence.

9. The drying process according to claim 8, characterized in that, In step S1 or step S5, the temperature of the raw material gas input into the raw material gas inlet (16) is between 90°C and 200°C.

10. The drying process according to claim 8, characterized in that, In step S2, the temperature of the first split gas passing through the heater (15) is 220°C-300°C; And / or, in step S6, the temperature of the fifth split gas passing through the heater (15) is 220°C-300°C.

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