Dehydration mechanism and dehydration system
By setting up activated alumina and molecular sieve dehydration towers in parallel and utilizing the alternating operation of valves and heaters, the problem of poor dehydration effect of activated alumina under high water volume conditions was solved, achieving efficient gas dehydration and regeneration control, and reaching a high atmospheric pressure dew point.
Patent Information
- Application Number
- CN202422369954.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-09-27
AI Technical Summary
The adsorbent in the existing dual-tower adsorption tower is activated alumina, which cannot achieve a high atmospheric pressure dew point under high water volume conditions, and the regeneration effect is not strong, so it cannot meet the high requirements of gas dehydration.
The first and second dehydration components are arranged in parallel, each containing activated alumina and a molecular sieve dehydration tower, respectively. The gas is initially and deeply dehydrated by switching valves, and regenerated by heaters. They work alternately to achieve a high atmospheric pressure dew point.
It achieves improved gas dehydration performance under high water volume conditions, reaching an atmospheric pressure dew point of -75℃ to -80℃, and improves regeneration efficiency and system stability through precise control of the regeneration process.
Smart Images
Figure CN223615663U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dehydration technology, and in particular to a dehydration mechanism and a dehydration system. Background Technology
[0002] Currently, the most widely used and technologically mature gas dehydration processes both domestically and internationally include three methods: low-temperature separation, solid adsorption, and solvent absorption. Among solid adsorption methods, molecular sieve dehydration is the most widely used and the most mature and reliable technology.
[0003] Molecular sieve dehydration primarily employs a dual-tower structure: one tower for adsorption and one tower for regeneration. The adsorption process is as follows: Water-containing gas passes through an inlet coarse filter and an oil removal filter to remove dust, free water, and oil. It then enters the adsorption tower via the inlet pipeline. The adsorption tower is filled with adsorbent, primarily activated alumina or molecular sieves. When the water-containing gas flows over the surface of the adsorbent, the water in the gas is adsorbed by the pores of the adsorbent due to intermolecular forces, while the gas itself is not adsorbed and flows out of the adsorption tower, resulting in dry gas. The regeneration process is as follows: The molecular sieve dehydration system uses a micro-heating, depressurization regeneration method. The regeneration gas is taken from the finished gas output of the final dust filter, heated to 80–120°C by a heater, and then enters the molecular sieve drying tower from top to bottom to heat the molecular sieve. The water adsorbed by the molecular sieve is desorbed by the high-temperature, low-pressure regeneration gas. The desorbed saturated water, along with the regeneration gas, enters the regeneration gas recovery pipeline for recycling.
[0004] However, in existing dual-tower structures, the adsorbent in the adsorption tower is activated alumina, which is mainly used in applications with high water content. Because it requires a low regeneration temperature and is not resistant to high temperatures, its regeneration effect is weak. Micro-thermal regeneration equipment using alumina as the adsorbent has a maximum dew point of -55℃ at atmospheric pressure. In some applications requiring higher gas dew points (such as -72℃ at atmospheric pressure), this dehydration system cannot meet the requirements. Replacing the adsorbent with molecular sieves can achieve a higher atmospheric pressure dew point, but it is not suitable for dehydration conditions with high water volumes. Utility Model Content
[0005] The purpose of this invention is to provide a dehydration mechanism that can perform secondary dehydration on gas, which is suitable for dehydration conditions with high water content and can achieve a high atmospheric pressure dew point.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dehydration mechanism, comprising a first dehydration component, a second dehydration component, a heater, and a valve arranged in parallel. The first and second dehydration components each include at least one dehydration tower containing activated alumina and at least one dehydration tower containing molecular sieves. The dehydration tower containing activated alumina and the dehydration tower containing molecular sieves are connected in series. The first and second dehydration components are switched by a valve.
[0007] The technical principle of this utility model is as follows:
[0008] When gas needs to be dehydrated, the gas enters the first dehydration component, where activated alumina performs preliminary dehydration to remove most of the liquid from the gas. Then, molecular sieves perform deep dehydration. At this point, the gas water dew point can reach -75℃ to -80℃ atmospheric pressure dew point, which is much higher than the -55℃ atmospheric pressure dew point of the simple activated alumina dehydration state.
[0009] After a period of operation, the gas is switched via a valve and enters the second dehydration component to complete the dehydration process in the same manner as described above. Simultaneously, the gas entering the heater is heated and then enters the first dehydration component to regenerate the activated alumina and molecular sieve. This gas is the regeneration gas discharged from the second dehydration component. Similarly, using the first dehydration component can simultaneously regenerate the second dehydration component.
[0010] Furthermore, the first dehydration component includes a first dehydration tower and a second dehydration tower connected in series. The first dehydration tower contains activated alumina, and the second dehydration tower contains molecular sieves. The heater is connected in parallel with both the first and second dehydration towers.
[0011] Furthermore, the second dehydration component includes a third dehydration tower and a fourth dehydration tower connected in series. The third dehydration tower contains activated alumina, and the fourth dehydration tower contains molecular sieves. The heater is connected in parallel with both the third and fourth dehydration towers.
[0012] Furthermore, the first dehydration tower and the second dehydration tower are connected in parallel with a first switching valve, and the third dehydration tower and the fourth dehydration tower are connected in parallel with a second switching valve.
[0013] Furthermore, the valves include a first intake valve, a second intake valve, a third intake valve, and a fourth intake valve. The first intake valve is installed on the first dehydration tower, the second intake valve is installed on the third dehydration tower, and both the third and fourth intake valves are installed on the heater. The third intake valve is connected to both the first and second dehydration towers, and the fourth intake valve is connected to both the third and fourth dehydration towers.
[0014] Furthermore, a first shut-off valve and a first flow valve are connected in series between the third air inlet valve and the second dehydration tower, and a second shut-off valve and a second flow valve are connected in series between the fourth air inlet valve and the fourth dehydration tower.
[0015] Another objective of this invention is to provide a dehydration system that enables the dehydration mechanism to operate more stably.
[0016] To achieve the above objectives, the present invention adopts the following technical solution: a dehydration system, comprising the dehydration mechanism as described above, a first filter, and a second filter. The first filter is connected in parallel with a first dehydration tower and a third dehydration tower, and a first valve is provided on the first filter. The second filter is connected in parallel with a second dehydration tower and a fourth dehydration tower, and a second valve is provided on the second filter.
[0017] Furthermore, a first check valve is installed between the second filter and the second dehydration tower, and a second check valve is installed between the second filter and the fourth dehydration tower.
[0018] Furthermore, thermometers are installed at the air inlets of the first and third dehydration towers, and at the air outlets of the second and fourth dehydration towers. A remote temperature monitoring instrument is installed on the heater, and a temperature transmitter is installed at the air outlet of the heater.
[0019] The beneficial effects of this utility model are as follows:
[0020] 1. The gas can be dehydrated by alternating the operation of the first dehydration component and the second dehydration component. It is suitable for dehydration conditions with high water content and can achieve a high atmospheric pressure dew point.
[0021] 2. By setting the first and second shut-off valves, the degree of regeneration of activated alumina and molecular sieve by the heated gas can be precisely controlled.
[0022] 3. The operation of this device can be monitored in real time by setting up a thermometer, a remote temperature monitoring instrument, and a temperature transmitter. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of this utility model.
[0024] In the above attached figures:
[0025] 1. First dehydration tower; 2. Second dehydration tower; 3. Third dehydration tower; 4. Fourth dehydration tower; 5. Heater; 6. First air inlet valve; 7. Second air inlet valve; 8. Third air inlet valve; 9. Fourth air inlet valve; 10. First filter; 11. First valve; 12. Second filter; 13. Second valve; 14. First check valve; 15. Second check valve; 16. First switching valve; 17. Second switching valve; 18. First shut-off valve; 19. First flow valve; 20. Second shut-off valve; 21. Second flow valve; 22. Thermometer; 23. Remote temperature transmitter; 24. Temperature transmitter. Detailed Implementation
[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments; the structures described in various embodiments can be freely combined without conflict in terms of structure or principle.
[0027] In this utility model, unless otherwise explicitly 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0029] The following description, in conjunction with the accompanying drawings, describes some embodiments of the present invention:
[0030] like Figure 1 As shown, this utility model proposes a dehydration mechanism, including a first dehydration component, a second dehydration component, a heater 5, and a valve arranged in parallel. The first dehydration component and the second dehydration component each include at least one dehydration tower containing activated alumina and at least one dehydration tower containing molecular sieve. The dehydration tower containing activated alumina and the dehydration tower containing molecular sieve are arranged in series. The first dehydration component and the second dehydration component are switched by a valve.
[0031] When gas needs to be dehydrated, it enters the first dehydration component, where activated alumina performs initial dehydration to remove most of the liquid from the gas. Then, molecular sieves perform deep dehydration. At this point, the gas water dew point can reach -75℃ to -80℃ atmospheric pressure dew point, which is much higher than the -55℃ atmospheric pressure dew point of the simple activated alumina dehydration state.
[0032] After a period of operation, the gas enters the second dehydration component through valve switching to complete the dehydration process in the same manner as described above. Simultaneously, the gas entering heater 5 is heated and then enters the first dehydration component, which regenerates the activated alumina and molecular sieve. This gas is the regeneration gas discharged from the second dehydration component. Similarly, using the first dehydration component can simultaneously regenerate the second dehydration component.
[0033] like Figure 1 As shown, the first dehydration assembly includes a first dehydration tower 1 and a second dehydration tower 2 connected in series. The first dehydration tower 1 contains activated alumina, and the second dehydration tower 2 contains molecular sieves. The heater 5 is connected in parallel with both the first and second dehydration towers 1 and 2. The second dehydration assembly includes a third dehydration tower 3 and a fourth dehydration tower 4 connected in series. The third dehydration tower 3 contains activated alumina, and the fourth dehydration tower 4 contains molecular sieves. The heater 5 is connected in parallel with both the third and fourth dehydration towers 3 and 4. The valves include a first inlet valve 6, a second inlet valve 7, a third inlet valve 8, and a fourth inlet valve 9. The first inlet valve 6 is located on the first dehydration tower 1, the second inlet valve 7 is located on the third dehydration tower 3, and both the third and fourth inlet valves 8 and 9 are located on the heater 5. The third inlet valve 8 is connected to both the first and second dehydration towers 1 and 2, and the fourth inlet valve 9 is connected to both the third and fourth dehydration towers 3 and 4.
[0034] When the first inlet valve 6 is opened, the second inlet valve 7 is closed, and the gas enters the first dehydration tower 1, where it undergoes preliminary dehydration by activated alumina to remove most of the liquid from the gas. The gas then enters the second dehydration tower 2 and undergoes deep dehydration through molecular sieves. At this point, the gas water dew point can reach -75℃ to -80℃ atmospheric pressure dew point, which is much higher than the -55℃ atmospheric pressure dew point of the simple activated alumina dehydration state.
[0035] After a period of operation, the first inlet valve 6 is closed, and the second inlet valve 7 is opened, allowing the gas to enter the third dehydration tower 3. Dehydration is then performed in the third and fourth dehydration towers 3 and 4 in the same manner as described above. Simultaneously, the third inlet valve 8 is opened, and the gas heated by the heater 5 enters the first and second dehydration towers 1 and 2, thus regenerating the activated alumina and molecular sieve. This gas is the regeneration gas discharged from the second dehydration tower 2. Similarly, when regeneration of the third and fourth dehydration towers 3 and 4 is required, the fourth inlet valve 9 is opened. Dehydration of the gas is achieved by alternating the operation of the first and second dehydration towers 1 and 2 with the third and fourth dehydration towers 3 and 4. Switching between the first, second, third, and fourth inlet valves 6 and 7 is manual, with a single valve switching time of less than 5 seconds.
[0036] The first dehydration tower 1 and the second dehydration tower 2 on the left side operate alternately with the third dehydration tower 3 and the fourth dehydration tower 4 on the right side, with a cycle of 4-6 hours. While one side is dehydrating, the other side is regenerating. During regeneration, the heating time is generally 2-3 hours, and the cold blowing time is generally 1-2 hours. The power of heater 5 varies depending on the equipment's throughput and the amount of packing material; under normal use, the power of heater 5 is approximately 1.5 kW.
[0037] like Figure 1 As shown, a first shut-off valve 18 and a first flow valve 19 are connected in series between the third air inlet valve 8 and the second dehydration tower 2, and a second shut-off valve 20 and a second flow valve 21 are connected in series between the fourth air inlet valve 9 and the fourth dehydration tower 4.
[0038] Activated alumina is suitable for wide-frequency, high-moisture-content applications, but requires low regeneration temperatures, resulting in moderate regeneration and less effective dehydration. Molecular sieves, on the other hand, are suitable for deep dehydration applications, but have a narrow dehydration bandwidth, require high regeneration temperatures, and offer good regeneration and dehydration, easily achieving higher dew point values. The regeneration of activated alumina and molecular sieves requires different amounts of high-temperature gas. Therefore, the pipe diameter between the third inlet valve 8 and the first dehydration tower 1 is smaller than that between the third inlet valve 8 and the second dehydration tower 2, and the pipe diameter between the fourth inlet valve 9 and the third dehydration tower 3 is smaller than that between the fourth inlet valve 9 and the fourth dehydration tower 4. Through adjustment by the first shut-off valve 18 and the first flow valve 19, or the second shut-off valve 20 and the second flow valve 21, the ratio of high-temperature gas entering the first dehydration tower 1 to the second dehydration tower 2, or the third dehydration tower 3 to the fourth dehydration tower 4, is maintained at 3:7. A large amount of heat is used to regenerate the molecular sieve, while a small amount is used to regenerate the alumina, thus improving heat utilization.
[0039] Furthermore, such as Figure 1 As shown, the first dehydration tower 1 and the second dehydration tower 2 are connected in parallel with a first switching valve 16, and the third dehydration tower 3 and the fourth dehydration tower 4 are connected in parallel with a second switching valve 17.
[0040] The dehydration system on one side requires the entry of high-temperature gas for regeneration. After the high-temperature gas regenerates the alumina and molecular sieve, it will carry out the moisture in the alumina and molecular sieve, which can be discharged by opening the first switching valve 16 or the second switching valve 17.
[0041] like Figure 1 As shown, a dehydration assembly includes the aforementioned dehydration mechanism, a first filter 10, and a second filter 12. The first filter 10 is connected in parallel with the first dehydration tower 1 and the third dehydration tower 3, and a first valve 11 is provided on the first filter 10. The second filter 12 is connected in parallel with the second dehydration tower 2 and the fourth dehydration tower 4, and a second valve 13 is provided on the second filter 12.
[0042] Both the first filter 10 and the second filter 12 consist of a gas filter and an oil removal filter. Before the gas enters the dehydration system, the first filter 10 filters out dust, free water, and oil from the gas, improving the efficiency of the dehydration system. Some of the filtered water and oil accumulate in the first filter 10; this can be drained by opening the first valve 11. The second filter 12 further filters the dehydrated regenerated gas, facilitating its use. Some of the regenerated gas enters the heater 5; the second filter 12's further filtration extends the lifespan of the heater 5. Impurities in the second filter 12 can be discharged through the second valve 13.
[0043] Furthermore, such as Figure 1 As shown, a first check valve 14 is provided between the second filter 12 and the second dehydration tower 2, and a second check valve 15 is provided between the second filter 12 and the fourth dehydration tower 4.
[0044] While dehydration occurs on one side, regeneration occurs on the other side. The first check valve 14 and the second check valve 15 prevent backflow of dehydrated gas or its entry into the regeneration side.
[0045] Furthermore, such as Figure 1 As shown, thermometers 22 are installed at the air inlets of the first dehydration tower 1 and the third dehydration tower 3, and thermometers 22 are installed at the air outlets of the second dehydration tower 2 and the fourth dehydration tower 4. A temperature remote monitoring instrument is installed on the heater 5, and a temperature transmitter 24 is installed at the air outlet of the heater 5.
[0046] The temperature transmitter 24 consists of a remote temperature detector 23 and a local temperature display. By setting the thermometer 22, the remote temperature detector 23 and the temperature transmitter 24, the working status of the dehydration system can be monitored in real time.
Claims
1. A dehydration mechanism, characterized in that: The first dehydration component includes a first dehydration component, a second dehydration component, a heater (5), and a valve, all connected in parallel. Both the first and second dehydration components include at least one dehydration tower containing activated alumina and at least one dehydration tower containing molecular sieves. The dehydration tower containing activated alumina and the dehydration tower containing molecular sieves are connected in series. The first and second dehydration components are switched by a valve. The first dehydration component includes a first dehydration tower (1) and a second dehydration tower (2) connected in series. The first dehydration tower (1) contains activated alumina, and the second dehydration tower (2) contains molecular sieves. The heater (5) is connected in parallel with both the first and second dehydration towers (1 and (2). The second dehydration component includes a third dehydration tower (3) and a fourth dehydration tower (4) connected in series. The third dehydration tower (3) contains activated alumina, and the fourth dehydration tower (4) contains molecular sieves. The heater (5) is connected in parallel with both the third and fourth dehydration towers (3 and (4).
2. The dehydration mechanism according to claim 1, characterized in that, The first dehydration tower (1) and the second dehydration tower (2) are connected in parallel with a first switching valve (16), and the third dehydration tower (3) and the fourth dehydration tower (4) are connected in parallel with a second switching valve (17).
3. The dehydration mechanism according to claim 1, characterized in that, The valves include a first air inlet valve (6), a second air inlet valve (7), a third air inlet valve (8), and a fourth air inlet valve (9). The first air inlet valve (6) is installed on the first dehydration tower (1), the second air inlet valve (7) is installed on the third dehydration tower (3), the third air inlet valve (8) and the fourth air inlet valve (9) are both installed on the heater (5), and the third air inlet valve (8) is connected to both the first dehydration tower (1) and the second dehydration tower (2), and the fourth air inlet valve (9) is connected to both the third dehydration tower (3) and the fourth dehydration tower (4).
4. A dehydration mechanism according to claim 3, characterized in that, A first shut-off valve (18) and a first flow valve (19) are connected in series between the third air inlet valve (8) and the second dehydration tower (2), and a second shut-off valve (20) and a second flow valve (21) are connected in series between the fourth air inlet valve (9) and the fourth dehydration tower (4).
5. A dehydration system comprising the dehydration mechanism according to any one of claims 1 to 4, characterized in that, It also includes a first filter (10) and a second filter (12). The first filter (10) is connected in parallel with the first dehydration tower (1) and the third dehydration tower (3). The first filter (10) is equipped with a first valve (11). The second filter (12) is connected in parallel with the second dehydration tower (2) and the fourth dehydration tower (4). The second filter (12) is equipped with a second valve (13).
6. A dehydration system according to claim 5, characterized in that, A first check valve (14) is provided between the second filter (12) and the second dehydration tower (2), and a second check valve (15) is provided between the second filter (12) and the fourth dehydration tower (4).
7. A dehydration system according to claim 5, characterized in that, The thermometer (22) is installed at the air inlet of the first dehydration tower (1) and the third dehydration tower (3). The thermometer (22) is installed at the air outlet of the second dehydration tower (2) and the fourth dehydration tower (4). A temperature remote monitoring instrument is installed on the heater (5). A temperature transmitter (24) is installed at the air outlet of the heater (5).