An adsorption column heat exchange device and an adsorption column with the device

Abstract

The utility model discloses an adsorption tower heat exchange device and adsorption tower with the device belong to natural gas processing equipment technical field, and this heat exchange device includes heat exchange coil, reheats heat exchanger and air heating furnace, and a plurality of groups heat exchange coil and air heating furnace are connected in series through the connecting pipe, and the cold medium end of a plurality of groups reheats heat exchanger is connected in series on the connecting pipe, and air heating furnace is equipped with heating tube bundle in, and the both ends of heating tube bundle are connected with reheating connecting pipe, and the hot medium end of reheats heat exchanger is connected in series on reheating connecting pipe, the utility model adsorption tower's heat exchange coil is connected in series with a plurality of groups reheats heat exchanger, and the hot air is gradually heated through reheats heat exchanger, and the hot air enters the upper layer heat exchange pipe first through reheats heat exchanger and heats again, and the heat that loses is supplemented. Make the temperature even in adsorption tower inside up and down, avoid the heat loss of air in heat exchange coil and lead to the terminal temperature reduction, and then make the temperature distribution of adsorption tower inside up and down more even, improve desorption efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of natural gas processing equipment, specifically an adsorption tower heat exchange device and an adsorption tower equipped with the device. Background Technology

[0002] Adsorption towers are crucial equipment in natural gas processing, used to remove impurities from natural gas. They selectively capture specific impurities by filling porous adsorbents (such as activated carbon). The physical adsorption process is exothermic, necessitating cooling of the adsorbent. As the adsorption front advances, a breakthrough curve forms, with the breakthrough point indicating dynamic saturation. Once saturated, the adsorbent needs to be regenerated through desorption. Desorption is endothermic, requiring heating to release the adsorbed substances and make the adsorbent usable again. Common heating methods include steam heating or purging with high-temperature regeneration gas.

[0003] For example, Chinese utility model patent document CN213160096U discloses a novel heat exchange structure for an adsorption tower, including an adsorption tower body, an inlet pipe, an outlet pipe, a heat exchange pipe, an exhaust fan, a hot gas pipe, a heating device, a circulating fan, an exhaust pipe, and a return pipe. The inlet pipe, heat exchange pipe, outlet pipe, and exhaust fan are connected in sequence. The heat exchange pipe is located inside the adsorption tower body. One end of the hot gas pipe is bypassed to the inlet pipe, and the other end is connected to the outlet end of the heating device. The inlet end of the heating device is connected to the outlet end of the circulating fan through a pipeline. The inlet end of the circulating fan is connected to the exhaust pipe. One end of the return pipe is bypassed to the outlet pipe, and the other end is bypassed to the exhaust pipe. An inlet valve is provided on the inlet pipe, an outlet valve is provided on the outlet pipe, a hot air valve is provided on the hot gas pipe, a return valve is provided on the return pipe, and an exhaust valve is provided on the exhaust pipe.

[0004] The above-mentioned device uses air heating, which solves the problem that the residual liquid after steam liquefaction has a large amount of heat, which is not conducive to the subsequent cold blowing process and affects the adsorption efficiency of the adsorbent. However, air carries a low heat density. As the heat of the hot air in the heat exchange tube is lost, the temperature at the end of the heat exchange tube will decrease, resulting in uneven temperature distribution in the adsorption tower and affecting the desorption effect. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model proposes an adsorption tower heat exchange device and an adsorption tower equipped with the device. Existing air heat exchange structures in adsorption towers suffer from reduced temperature at the end of the heat exchange tubes and uneven temperature distribution within the adsorption tower, which affects the desorption effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of this utility model discloses an adsorption tower heat exchange device, comprising several sets of heat exchange coils, several sets of reheat heat exchangers, and an air heater. The several sets of heat exchange coils are connected in series via connecting pipes. The upper and lower ends of the connecting pipes are respectively connected to an inlet end of a first three-way valve and an outlet end of a second three-way valve. The cold medium ends of the several sets of reheat heat exchangers are connected in series on the connecting pipes. The air heater contains a heating tube bundle, and both ends of the heating tube bundle are connected to reheat connecting pipes. The hot medium ends of the several sets of reheat heat exchangers are connected in series on the reheat connecting pipes. One outlet end of the first three-way valve is connected to the inlet end of the air heater via a hot air outlet pipe, and the other outlet end of the first three-way valve is connected to a cold air outlet pipe. One inlet end of the second three-way valve is connected to the outlet end of the air heater via a hot air inlet pipe, and the other inlet end of the second three-way valve is connected to a cold air inlet pipe. One end of the cold air inlet pipe is connected to a cooler.

[0008] Preferably, a liquid heat exchange medium circulates within the heating tube bundle and the reheat connection pipe. The liquid heat exchange medium enters from the heat medium inlet end of the uppermost reheat heat exchanger and flows out from the heat medium outlet end of the lowermost reheat heat exchanger. A circulation pump is connected to the reheat connection pipe.

[0009] Preferably, the liquid heat exchange medium is heat transfer oil or water.

[0010] Preferably, the cold medium end of the reheat heat exchanger is connected to the connecting pipe through a first solenoid valve. A diversion pipe is provided on the side of the first solenoid valve away from the reheat heat exchanger. The diversion pipe is connected in parallel with the reheat heat exchanger on the connecting pipe, and a second solenoid valve is provided on the diversion pipe.

[0011] Preferably, a first temperature sensor is provided on the reheat connection pipe, and a second temperature sensor is provided on the connection pipe. The second temperature sensor is located between the heat exchange coil outlet and the shunt pipe inlet. The first temperature sensor and the second temperature sensor are electrically connected to the first solenoid valve and the second solenoid valve through a control circuit.

[0012] Preferably, the heat exchange coil has an S-shaped structure, and the heat exchange coil bends repeatedly along an S-shaped path within the circular outline area.

[0013] Preferably, a hot air circulation fan is connected to the hot air inlet pipe.

[0014] Preferably, the air inlet of the air cooler is connected to a refrigeration unit.

[0015] The second aspect of this utility model provides an adsorption tower with the above-mentioned heat exchange device. The adsorption tower has several sets of adsorption beds arranged from top to bottom inside the tower body, and a set of heat exchange coils are installed at the bottom of each set of adsorption beds.

[0016] Beneficial effects: Compared with the prior art, the present invention can achieve at least the following technical effects;

[0017] 1. This utility model connects several sets of reheat heat exchangers in series on the heat exchange coil of the adsorption tower. The reheat heat exchangers supplement heat to the heat exchange coil, avoiding the loss of heat from the air inside the heat exchange coil and thus reducing the terminal temperature. This makes the temperature distribution inside and outside the adsorption tower more uniform and improves the desorption efficiency.

[0018] 2. This utility model is equipped with multiple sets of S-shaped heat exchange coils, which increases the heat exchange area of ​​the heat exchange coils and improves the heat exchange efficiency.

[0019] 3. This utility model uses hot air as the heat medium, which avoids the heat release from the liquefaction of residual vapor compared to a steam-heated adsorption tower, thus improving the cooling efficiency of the adsorption process.

[0020] 4. This utility model incorporates a branch pipe connected in parallel with the reheat heat exchanger on its connecting pipe. Temperature sensors are also installed on the cold air outlet pipe and the reheat connecting pipe. During cooling, the cold air circulation path is selected based on the temperature difference between the exhaust temperature of the cold air outlet pipe and the liquid heat exchange medium. When the cooling air temperature is higher than that of the liquid heat exchange medium, the air flows through the reheat heat exchanger to recover heat from the cooling air. When the cooling air temperature is lower than that of the liquid heat exchange medium, the cooling air flows through the branch pipe, preventing the residual heat of the reheat heat exchanger from affecting the cooling effect. This improves thermal management efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the heat exchange device and adsorption tower of this utility model.

[0022] Figure 2 This is a schematic diagram of the heat exchange coil structure of this utility model.

[0023] Figure 3 This utility model Figure 1 Enlarged view of point A in the middle.

[0024] In the diagram: 1. Tower body; 2. Heat exchange coil; 3. Adsorption bed; 4. Cold air outlet duct; 5. First three-way valve; 6. Reheat heat exchanger; 7. Air heater; 8. Heating tube bundle; 9. Circulating pump; 10. Hot air circulating fan; 11. Hot air inlet duct; 12. Hot air outlet duct; 13. Second three-way valve; 14. Refrigeration unit; 15. Cold air blower; 16. Cold air inlet duct; 17. Connecting pipe; 18. Reheat connecting pipe; 19. First solenoid valve; 20. Diverter pipe; 21. Second solenoid valve; 22. First temperature sensor; 23. Second temperature sensor. Detailed Implementation

[0025] The present invention will be further explained below with reference to specific implementation examples.

[0026] Please see Figure 1 This embodiment first proposes an adsorption tower heat exchange device, which includes several sets of heat exchange coils 2, several sets of reheat heat exchangers 6, and an air heater 7. The several sets of heat exchange coils 2 are connected in series via connecting pipes 17. The upper and lower ends of the connecting pipes 17 are respectively connected to an inlet end of a first three-way valve 5 and an outlet end of a second three-way valve 13. The cold medium ends of the several sets of reheat heat exchangers 6 are connected in series on the connecting pipes 17. The air heater 7 is equipped with a heating tube bundle 8, and the two ends of the heating tube bundle 8 are connected to reheat coils 7. Connector 18, the heat medium ends of several sets of reheat heat exchangers 6 are connected in series on reheat connection pipe 18, one outlet end of the first three-way valve 5 is connected to the inlet end of the air heater 7 through hot air outlet pipe 12, the other outlet end of the first three-way valve 5 is connected to cold air outlet pipe 4, one inlet end of the second three-way valve 13 is connected to the outlet end of the air heater 7 through hot air inlet pipe 11, the other inlet end of the second three-way valve 13 is connected to cold air inlet pipe 16, one end of the cold air inlet pipe 16 is connected to air cooler 15.

[0027] During the adsorption process in the adsorption tower, the first three-way valve 5 and the second three-way valve 13 connect the two ends of the connecting pipe 17 to the cold air inlet pipe 16 and the cold air outlet pipe 4, respectively. The cold air blower 15 blows cold air into the heat exchange coil 2 to cool the adsorption material and improve the adsorption efficiency.

[0028] During the desorption process in the adsorption tower, the first three-way valve 5 and the second three-way valve 13 connect the hot air outlet pipe 11 and the hot air inlet pipe 12 to the two ends of the connecting pipe 17, respectively. The air heated by the air heater 7 enters the connecting pipe 17 and the heat exchange coil 2 through the hot air inlet pipe 12. The heat exchange coil 2 heats the adsorbent material in the adsorption tower, causing the adsorbent material to desorb. After passing through all the heat exchange coils 2, the hot air enters the air heater 7 through the hot air outlet pipe 11, forming a cycle.

[0029] Meanwhile, after passing through each set of heat exchange coils 2, the hot air enters a set of reheat heat exchangers 6. The heat medium end of the reheat heat exchanger 6 exchanges heat with the hot air, replenishing the heat lost by the hot air as it flows through the heat exchange coils 2. The heat at the heat medium end of the reheat heat exchanger 6 comes from the heating tube bundle 8 inside the air heater 7. The number of heat exchange coils 2 is the same as the number of reheat heat exchangers 6, ensuring that the heat lost by the hot air after flowing through each set of heat exchange coils 2 is replenished in a timely manner, maintaining the air inside the heat exchange coils 2 at a consistently high temperature.

[0030] In this embodiment, the heating tube bundle 8 and the reheat connection pipe 18 are further configured to have a liquid heat exchange medium circulating inside them. The liquid heat exchange medium enters from the heat medium inlet end of the uppermost reheat heat exchanger 6 and flows out through the heat medium outlet end of the lowermost reheat heat exchanger 6. A circulation pump 9 is connected to the reheat connection pipe 18.

[0031] In this embodiment, the cold medium end and hot medium end of multiple sets of reheat heat exchangers 6 are connected in series. The liquid heat exchange medium in the heating tube bundle 8 circulates in the heating tube bundle 8, the reheat connecting pipe 18, and the hot medium flow channel of the reheat heat exchanger 6. The circulation direction of the liquid heat exchange medium is opposite to the circulation direction of the hot air. At the same time, the flow rate of the liquid heat exchange medium is increased by the circulation pump 9 to achieve reasonable heat replenishment, thereby making the temperature distribution in the adsorption tower more uniform and further improving the desorption efficiency.

[0032] In this embodiment, the liquid heat exchange medium is further configured to be heat transfer oil or water.

[0033] In this embodiment, a liquid with a large specific heat capacity, such as water or heat transfer oil, is selected as the heat medium for the reheat heat exchanger 6 in order to effectively replenish the heat of the air in the connecting pipe 17.

[0034] In this embodiment, the cold medium end of the reheat heat exchanger 6 is connected to the connecting pipe 17 through a first solenoid valve 19. A diversion pipe 20 is provided on the side of the first solenoid valve 19 away from the reheat heat exchanger 6. The diversion pipe 20 is connected in parallel with the reheat heat exchanger 6 on the connecting pipe 17. A second solenoid valve 21 is provided on the diversion pipe 20.

[0035] During the cooling adsorption process in the adsorption tower, the first solenoid valve 19 is closed while the second solenoid valve 21 is opened, allowing the cooling gas to flow in the diversion pipe 20 without passing through the reheat heat exchanger 6, thus avoiding the residual heat of the reheat heat exchanger 6 from affecting the cooling effect.

[0036] Please see Figure 3 In this embodiment, a first temperature sensor 22 is provided on the reheat connection pipe 18, and a second temperature sensor 23 is provided on the connection pipe 17. The second temperature sensor 23 is located between the outlet of the heat exchange coil 2 and the inlet of the diversion pipe 20. The first temperature sensor 22 and the second temperature sensor 23 are electrically connected to the first solenoid valve 19 and the second solenoid valve 21 through a control circuit.

[0037] The first temperature sensor 22 measures the temperature of the liquid heat exchange medium, and the second temperature sensor 23, located near the inlet of the splitter pipe 20 on the connecting pipe 17, measures the temperature of the cooling gas. The first temperature sensor 22, the second temperature sensor 23, the first solenoid valve 19, and the second solenoid valve 21 form a control loop through a microcontroller or PLC control circuit. When the reading of the second temperature sensor 23 is higher than the reading of the first temperature sensor 22, it indicates that the temperature of the cooling gas at that location is higher than the temperature of the liquid heat exchange medium. The first solenoid valve 19 opens, the second solenoid valve 21 closes, and the cooling gas flows through the reheat heat exchanger 6, where the liquid heat exchange medium recovers the residual heat of the cooling gas. When the reading of the second temperature sensor 23 is lower than the reading of the first temperature sensor 22, the first solenoid valve 19 closes, the second solenoid valve 21 opens, and the cooling gas flows through the splitter pipe 20 without passing through the reheat heat exchanger 6, thus preventing the residual heat of the liquid heat exchange medium in the reheat heat exchanger 6 from affecting the cooling effect.

[0038] Please see Figure 2 In this embodiment, the heat exchange coil 2 is further configured to have an S-shaped structure, and the heat exchange coil 2 is repeatedly bent along the S-shaped path within the circular outline area to increase the heat dissipation area of ​​the heat exchange coil 2 and improve the heat exchange efficiency.

[0039] In this embodiment, the hot air inlet pipe 11 is further configured to be connected to a hot air circulation fan 10. By setting up the hot air circulation fan 10, the hot air flow rate is further increased, and the heat exchange effect is improved.

[0040] In this embodiment, the air inlet of the air cooler 15 is connected to a refrigeration unit 14.

[0041] This embodiment also proposes an adsorption tower scheme, which includes the aforementioned heat exchange device. Several sets of adsorption beds 3 are arranged from top to bottom inside the tower body 1, and a set of heat exchange coils 2 are installed at the bottom of each set of adsorption beds 3. The adsorption beds 3 are heated or cooled through the heat exchange coils 2.

[0042] By setting up the refrigeration unit 14, the cooling effect can be further improved, and the cooling temperature can be easily controlled.

[0043] In the description of this utility model, the term "multiple" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0044] In the description of this utility model, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this utility model, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A heat exchange device for an adsorption tower, characterized in that, The system includes several sets of heat exchange coils (2), several sets of reheat heat exchangers (6), and an air heater (7). The heat exchange coils (2) are connected in series via connecting pipes (17). The upper and lower ends of the connecting pipes (17) are respectively connected to an inlet end of a first three-way valve (5) and an outlet end of a second three-way valve (13). The cold medium ends of the several sets of reheat heat exchangers (6) are connected in series on the connecting pipes (17). The air heater (7) is equipped with a heating tube bundle (8). Both ends of the heating tube bundle (8) are connected to reheat connecting pipes (18). The heat medium end of the heater (6) is connected in series to the reheat connection pipe (18). One outlet end of the first three-way valve (5) is connected to the inlet end of the air heater (7) through the hot air outlet pipe (12). The other outlet end of the first three-way valve (5) is connected to the cold air outlet pipe (4). One inlet end of the second three-way valve (13) is connected to the outlet end of the air heater (7) through the hot air inlet pipe (11). The other inlet end of the second three-way valve (13) is connected to the cold air inlet pipe (16). One end of the cold air inlet pipe (16) is connected to the air cooler (15).

2. The adsorption tower heat exchange device according to claim 1, characterized in that, The heating tube bundle (8) and the reheat connection pipe (18) are filled with a liquid heat exchange medium. The liquid heat exchange medium enters from the heat medium inlet end of the uppermost reheat heat exchanger (6) and flows out through the heat medium outlet end of the lowermost reheat heat exchanger (6). A circulation pump (9) is connected to the reheat connection pipe (18).

3. The adsorption tower heat exchange device according to claim 2, characterized in that, The liquid heat exchange medium is heat transfer oil or water.

4. The adsorption tower heat exchange device according to claim 1, characterized in that, The cold medium end of the reheat heat exchanger (6) is connected to the connecting pipe (17) through the first solenoid valve (19). The first solenoid valve (19) is provided with a diversion pipe (20) on the side away from the reheat heat exchanger (6). The diversion pipe (20) is connected in parallel with the reheat heat exchanger (6) on the connecting pipe (17). A second solenoid valve (21) is provided on the diversion pipe (20).

5. The adsorption tower heat exchange device according to claim 4, characterized in that, A first temperature sensor (22) is provided on the reheat connection pipe (18), and a second temperature sensor (23) is provided on the connection pipe (17). The second temperature sensor (23) is located between the outlet of the heat exchange coil (2) and the inlet of the diversion pipe (20). The first temperature sensor (22) and the second temperature sensor (23) are electrically connected to the first solenoid valve (19) and the second solenoid valve (21) through a control circuit.

6. The adsorption tower heat exchange device according to claim 1, characterized in that, The heat exchange coil (2) has an S-shaped structure, and the heat exchange coil (2) bends repeatedly along the S-shaped path within the circular outline area.

7. The adsorption tower heat exchange device according to claim 1, characterized in that, A hot air circulation fan (10) is connected to the hot air inlet pipe (11).

8. The adsorption tower heat exchange device according to claim 1, characterized in that, The air inlet of the air cooler (15) is connected to a refrigeration unit (14).

9. An adsorption tower with a heat exchange device as described in any one of claims 1-8, characterized in that, The adsorption tower has several sets of adsorption beds (3) arranged from top to bottom inside the tower body (1), and a set of heat exchange coils (2) are installed at the bottom of each set of adsorption beds (3).

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