Counter-flow type double-effect rectification system based on supergravity technology

Abstract

The utility model relates to a counter-flow type double-effect rectification system based on a supergravity technology, which comprises a normal-pressure rectification unit comprising a normal-pressure reboiler and a normal-pressure rectification supergravity machine which are connected with each other, the negative pressure rectification unit comprises a negative pressure reboiler, a negative pressure rectification supergravity machine and a vacuum system which are connected with one another; the normal-pressure rectification supergravity machine is provided with a normal-pressure supergravity steam outlet, the negative-pressure reboiler is provided with a negative-pressure reboiling steam inlet, the normal-pressure supergravity steam outlet is communicated with the negative-pressure reboiling steam inlet, and the negative-pressure reboiler is provided with a negative-pressure reboiling material outlet. The normal-pressure rectification supergravity machine is provided with a normal-pressure supergravity material inlet, the negative-pressure reboiling material outlet is communicated with the normal-pressure supergravity material inlet through a pipeline, and a booster pump is arranged in the middle of the pipeline; and the step preheating assembly comprises a first preheater and a second preheater which are connected in series.

Description

Technical Field

[0001] The utility model relates to a distillation system, in particular to a countercurrent double-effect distillation system based on supergravity technology. Background Art

[0002] Distillation technology, as a core process in the field of chemical separation, is widely used in processes such as solvent recovery and product purification. In the separation of low-boiling-point solvent aqueous solutions, traditional single-effect distillation systems have inherent defects such as high energy consumption and low thermal efficiency.

[0003] However, in the double-effect distillation system, there are problems of insufficient heat utilization and high operating costs. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a countercurrent double-effect distillation system based on supergravity technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an atmospheric distillation unit, including an atmospheric reboiler and an atmospheric distillation supergravity machine connected to each other; a negative pressure distillation unit, including a negative pressure reboiler, a negative pressure distillation supergravity machine and a vacuum system connected to each other; a heat transfer pipeline: the atmospheric distillation supergravity machine has an atmospheric supergravity steam outlet, the negative pressure reboiler has a negative pressure reboiler steam inlet, the atmospheric supergravity steam outlet is connected to the negative pressure reboiler steam inlet, a countercurrent material channel: the negative pressure reboiler has a negative pressure reboiler material outlet, the atmospheric distillation supergravity machine has an atmospheric supergravity material inlet, the negative pressure reboiler material outlet is connected to The atmospheric pressure supergravity material inlets are connected by pipelines and a booster pump is arranged in the middle of the pipelines; the cascade preheating component comprises a first preheater and a second preheater connected in series, wherein: the second preheater has a second cold side inlet, a second hot side inlet and a second cold side outlet, the second cold side inlet is connected to the external material, and the second hot side inlet is connected to the negative pressure distillation supergravity machine; the first preheater has a first cold side inlet, a first cold side outlet and a first hot side inlet, the first cold side inlet is connected to the second cold side outlet, the first hot side inlet is connected to the atmospheric pressure supergravity distillation machine and the negative pressure reboiler, and the first cold side outlet is connected to the negative pressure distillation supergravity machine.

[0006] By adopting the above technical solution, after the material enters the second preheater, it is preheated for the first time, and then enters the first preheater for the second preheating, and then enters the negative pressure distillation gravity machine for negative pressure distillation, and then the material passes through the negative pressure reboiler. Under the action of the booster pump, the material enters the atmospheric pressure distillation super gravity machine for atmospheric distillation, and finally flows out through the atmospheric pressure reboiler. During the above process, the heat source heats the atmospheric pressure reboiler, and the steam from the atmospheric pressure reboiler enters the atmospheric pressure distillation super gravity machine to heat the material therein, and then the steam again heats the negative pressure reboiler. The steam then enters the first preheater to preheat the corresponding material for the second time, and the steam generated in the negative pressure reboiler enters the negative pressure distillation supergravity machine to heat the material therein, and then the steam enters the second preheater. In the above process, the temperature in the second preheater is the lowest, and then the first preheater, negative pressure distillation supergravity machine, negative pressure distillation reboiler, atmospheric pressure distillation supergravity machine atmospheric pressure reboiler, that is, the flow direction of the material, so that the material can be heated gradually and the heat energy is fully utilized. Compared with the downstream type, the countercurrent type has a high heat energy recycling rate.

[0007] The utility model is further configured as follows: the atmospheric pressure reboiler also has a heat source port, an atmospheric pressure reboiler steam outlet, an atmospheric pressure reboiler material inlet and an atmospheric pressure reboiler material outlet; the atmospheric pressure distillation supergravity machine also has an atmospheric pressure supergravity steam inlet and an atmospheric pressure supergravity material outlet; the heat source port is connected to an external heat source; the atmospheric pressure reboiler steam outlet is communicated with the atmospheric pressure supergravity steam inlet and transfers steam from the atmospheric pressure reboiler to the atmospheric pressure distillation supergravity machine; the atmospheric pressure reboiler material inlet is communicated with the atmospheric pressure supergravity material outlet and transfers material from the atmospheric pressure distillation supergravity machine to the atmospheric pressure reboiler; and the atmospheric pressure reboiler material outlet is communicated with the outside world.

[0008] The utility model is further configured as follows: the negative pressure reboiler also has a negative pressure reboiler material inlet, a negative pressure reboiler steam outlet and a negative pressure reboiler heat source outlet; the negative pressure distillation supergravity machine also has a negative pressure supergravity material outlet, a negative pressure supergravity material inlet, a negative pressure supergravity steam inlet and a negative pressure supergravity steam outlet; the negative pressure reboiler material inlet is connected to the negative pressure supergravity material outlet, the negative pressure reboiler steam outlet is connected to the negative pressure supergravity steam inlet, the negative pressure reboiler heat source outlet is connected to the first hot side inlet, the negative pressure supergravity material inlet is connected to the first cold side outlet, and the negative pressure supergravity steam outlet is connected to the second hot side inlet.

[0009] The utility model is further configured as follows: a diaphragm pump is provided between the negative pressure reboiler and the first preheater.

[0010] The utility model is further configured as follows: the height of the negative pressure reboiler heat source outlet is higher than the height of the first hot side.

[0011] By adopting the above technical solution, no pump is used, and the gravity generated by the height difference is used to complete the transportation.

[0012] The utility model is further configured as follows: the operating pressure of the vacuum system is -0.03MPa to -0.095MPa.

[0013] By adopting the above technical solutions, the vacuum range balances energy consumption and separation efficiency, avoiding a surge in high vacuum energy consumption.

[0014] The utility model is further configured as follows: the atmospheric pressure reboiler and the negative pressure reboiler are both vertical or horizontal structures.

[0015] By adopting the above technical solutions, the vertical structure saves space and is suitable for small flow rates and high-boiling-point materials; the horizontal structure facilitates uniform heating of large flow rates and prevents coking; it is compatible with different working conditions and improves system adaptability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model including a diaphragm pump;

[0017] Figure 2 This is a schematic diagram of the overall structure of the utility model without the diaphragm pump.

[0018] In the figure: 1. Atmospheric pressure distillation supergravity machine; 11. Atmospheric pressure supergravity steam outlet; 12. Atmospheric pressure supergravity material inlet; 13. Atmospheric pressure supergravity steam inlet; 14. Atmospheric pressure supergravity material outlet; 2. Atmospheric pressure reboiler; 21. Heat source outlet; 22. Atmospheric pressure reboiler steam outlet; 23. Atmospheric pressure reboiler material inlet; 24. Atmospheric pressure reboiler material outlet; 3. Negative pressure distillation supergravity machine; 31. Negative pressure supergravity material outlet; 32. Negative pressure supergravity material inlet; 33. Negative pressure supergravity steam inlet; 34. Negative pressure High-pressure supergravity steam outlet; 4. Negative pressure reboiler; 41. Negative pressure reboiler steam inlet; 42. Negative pressure reboiler material outlet; 43. Negative pressure reboiler material inlet; 44. Negative pressure reboiler steam outlet; 45. Negative pressure reboiler heat source outlet; 5. Vacuum system; 6. Second preheater; 61. Second cold side inlet; 62. Second hot side inlet; 63. Second cold side outlet; 7. First preheater; 71. First cold side inlet; 72. First cold side outlet; 73. First hot side inlet; 8. Diaphragm pump; 9. Booster pump. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] like Figure 1-2As shown, the utility model discloses a countercurrent double-effect distillation system based on supergravity technology, an atmospheric distillation unit, including an atmospheric reboiler 2 and an atmospheric distillation supergravity machine 1 connected to each other; a negative pressure distillation unit, including a negative pressure reboiler 4, a negative pressure distillation supergravity machine 3 and a vacuum system 5 connected to each other; a heat transfer pipeline: the atmospheric distillation supergravity machine 1 has an atmospheric supergravity steam outlet 11, the negative pressure reboiler 4 has a negative pressure reboiled steam inlet 41, the atmospheric supergravity steam outlet 11 is connected to the negative pressure reboiled steam inlet 41, the countercurrent material channel: the negative pressure reboiler 4 has a negative pressure reboiled material outlet 42, the atmospheric distillation supergravity machine 1 has an atmospheric supergravity steam outlet 11, the negative pressure reboiler 4 has a negative pressure reboiled steam inlet 41, the atmospheric supergravity steam outlet 11 is connected to the negative pressure reboiled steam inlet 41, the countercurrent material channel: the negative pressure reboiler 4 has a negative pressure reboiled material outlet 42, the atmospheric distillation supergravity machine 1 has an atmospheric super The gravity material inlet 12, the negative pressure reboiled material outlet 42 and the normal pressure super gravity material inlet 12 are connected by a pipeline, and a booster pump 9 is arranged in the middle of the pipeline; the cascade preheating component: comprises a first preheater 7 and a second preheater 6 connected in series, wherein: the second preheater 6 has a second cold side inlet 61, a second hot side inlet 62 and a second cold side outlet 63, the second cold side inlet 61 is connected to the external material, and the second hot side inlet 62 is connected to the negative pressure distillation super gravity machine 3; the first preheater 7 has a first cold side inlet 71, a first cold side outlet 72 and a first hot side inlet 73, the first cold side inlet 71 is connected to the second cold side outlet 63, the first hot side The inlet 73 is connected to the atmospheric pressure super gravity distillation machine and the negative pressure reboiler 4, and the first cold side outlet 72 is connected to the negative pressure distillation super gravity machine 3. After the material enters the second preheater 6, it is preheated for the first time and then enters the first preheater 7 for the second preheating. Then it enters the negative pressure distillation gravity machine for negative pressure distillation. Then the material passes through the negative pressure reboiler 4. Under the action of the booster pump 9, the material enters the atmospheric pressure distillation super gravity machine 1 for atmospheric distillation and finally flows out through the atmospheric pressure reboiler 2. During the above process, the heat source heats the atmospheric pressure reboiler 2, and the steam from the atmospheric pressure reboiler 2 enters the atmospheric pressure distillation super gravity machine 1, which is used for the material therein. The material is heated, and then the steam heats the negative pressure reboiler 4, and then the steam enters the first preheater 7 to preheat the corresponding material for the second time, and the steam generated in the negative pressure reboiler 4 enters the negative pressure distillation supergravity machine 3 to heat the material therein, and then the steam enters the second preheater 6. In the above process, the temperature in the second preheater 6 is the lowest, and then the first preheater 7, negative pressure distillation supergravity machine 3, negative pressure distillation reboiler, atmospheric pressure distillation supergravity machine 1 and atmospheric pressure reboiler 2, that is, the flow direction of the material, so that the material can be heated gradually and the heat energy is fully utilized. Compared with the downstream type, the countercurrent type has a high heat energy recycling rate.

[0022] The atmospheric pressure reboiler 2 also has a heat source port 21, an atmospheric pressure reboiler steam outlet 22, an atmospheric pressure reboiler material inlet 23 and an atmospheric pressure reboiler material outlet 24. The atmospheric pressure distillation supergravity machine 1 also has an atmospheric pressure supergravity steam inlet 13 and an atmospheric pressure supergravity material outlet 14. The heat source port 21 is connected to an external heat source. The atmospheric pressure reboiler steam outlet 22 is connected to the atmospheric pressure supergravity steam inlet 13 and transfers steam from the atmospheric pressure reboiler 2 to the atmospheric pressure distillation supergravity machine 1. The atmospheric pressure reboiler material inlet 23 is connected to the atmospheric pressure supergravity material outlet 14 and transfers material from the atmospheric pressure distillation supergravity machine 1 to the atmospheric pressure reboiler 2. The atmospheric pressure reboiler material outlet 24 is connected to the outside world.

[0023] The negative pressure reboiler 4 also has a negative pressure reboiler material inlet 43, a negative pressure reboiler steam outlet 44 and a negative pressure reboiler heat source outlet 45. The negative pressure distillation supergravity machine 3 also has a negative pressure supergravity material outlet 31, a negative pressure supergravity material inlet 32, a negative pressure supergravity steam inlet 33 and a negative pressure supergravity steam outlet 34. The negative pressure reboiler material inlet 43 is connected to the negative pressure supergravity material outlet 31, the negative pressure reboiler steam outlet 44 is connected to the negative pressure supergravity steam inlet 33, the negative pressure reboiler heat source outlet 45 is connected to the first hot side inlet 73, the negative pressure supergravity material inlet 32 ​​is connected to the first cold side outlet 72, and the negative pressure supergravity steam outlet 34 is connected to the second hot side inlet 62.

[0024] A diaphragm pump 8 is provided between the negative pressure reboiler 4 and the first preheater 7 .

[0025] The height of the negative pressure reboiler heat source outlet 45 is higher than that of the first hot side, and no pump is used, but gravity generated by the height difference is used to complete the transportation.

[0026] The operating pressure of the vacuum system 5 is -0.03 MPa to -0.095 MPa. The vacuum range balances energy consumption and separation efficiency to avoid a surge in high vacuum energy consumption.

[0027] Both the atmospheric reboiler 2 and the negative pressure reboiler 4 are of vertical or horizontal structure. The vertical structure saves space and is suitable for small flow rate high boiling point materials; the horizontal structure facilitates uniform heating of large flow rate materials and prevents coking; it is compatible with different working conditions and improves system adaptability.

[0028] Working process: After the material enters the second preheater 6, it is preheated for the first time and then enters the first preheater 7 for the second preheating, and then enters the negative pressure distillation gravity machine for negative pressure distillation, and then the material passes through the negative pressure reboiler 4. Under the action of the booster pump 9, the material enters the atmospheric distillation supergravity machine 1 for atmospheric distillation, and finally flows out through the atmospheric reboiler 2. During the above process, the heat source heats the atmospheric reboiler 2, and the steam of the atmospheric reboiler 2 enters the atmospheric distillation supergravity machine 1 to heat the material therein, and then the steam heats the negative pressure reboiler 4 again, and then the steam enters the first preheater 7 to preheat the corresponding material for the second time, and the steam generated in the negative pressure reboiler 4 enters the negative pressure distillation supergravity machine 3 to heat the material therein, and then the steam enters the second preheater 6 again.

Claims

1. A countercurrent double-effect distillation system based on high gravity technology, characterized by: An atmospheric distillation unit comprises an atmospheric reboiler (2) and an atmospheric distillation supergravity machine (1) connected thereto; a negative pressure distillation unit comprises a negative pressure reboiler (4), a negative pressure distillation supergravity machine (3) and a vacuum system (5) connected thereto; a heat transfer pipeline: the atmospheric distillation supergravity machine (1) has an atmospheric supergravity steam outlet (11), the negative pressure reboiler (4) has a negative pressure reboiler steam inlet (41), the atmospheric supergravity steam outlet (11) is connected to the negative pressure reboiler steam inlet (41); a countercurrent material channel: the negative pressure reboiler (4) has a negative pressure reboiler material outlet (42), the atmospheric distillation supergravity machine (1) has an atmospheric supergravity material inlet (12), the negative pressure reboiler material outlet (42) is connected to the atmospheric supergravity material inlet (12) through a pipeline, and a booster pump (9) is provided in the middle of the pipeline; The step preheating assembly comprises a first preheater (7) and a second preheater (6) connected in series, wherein: the second preheater (6) has a second cold side inlet (61), a second hot side inlet (62) and a second cold side outlet (63), the second cold side inlet (61) is connected to the external material, and the second hot side inlet (62) is connected to the negative pressure distillation supergravity machine (3); the first preheater (7) has a first cold side inlet (71), a first cold side outlet (72) and a first hot side inlet (73), the first cold side inlet (71) is connected to the second cold side outlet (63), the first hot side inlet (73) is connected to the atmospheric supergravity distillation machine and the negative pressure reboiler (4), and the first cold side outlet (72) is connected to the negative pressure distillation supergravity machine (3).

2. The countercurrent double-effect distillation system based on supergravity technology according to claim 1, characterized in that: The atmospheric pressure reboiler (2) further comprises a heat source port (21), an atmospheric pressure reboiler steam outlet (22), an atmospheric pressure reboiler material inlet (23) and an atmospheric pressure reboiler material outlet (24); the atmospheric pressure distillation supergravity machine (1) further comprises an atmospheric pressure supergravity steam inlet (13) and an atmospheric pressure supergravity material outlet (14); the heat source port (21) is connected to an external heat source; the atmospheric pressure reboiler steam outlet (22) is connected to the atmospheric pressure supergravity steam inlet (13) and transfers steam from the atmospheric pressure reboiler (2) to the atmospheric pressure distillation supergravity machine (1); the atmospheric pressure reboiler material inlet (23) is connected to the atmospheric pressure supergravity material outlet (14) and transfers material from the atmospheric pressure distillation supergravity machine (1) to the atmospheric pressure reboiler (2); and the atmospheric pressure reboiler material outlet (24) is connected to the outside world.

3. The countercurrent double-effect distillation system based on high gravity technology according to claim 1, characterized in that: The negative pressure reboiler (4) further comprises a negative pressure reboiler material inlet (43), a negative pressure reboiler steam outlet (44) and a negative pressure reboiler heat source outlet (45); the negative pressure distillation supergravity machine (3) further comprises a negative pressure supergravity material outlet (31), a negative pressure supergravity material inlet (32), a negative pressure supergravity steam inlet (33) and a negative pressure supergravity steam outlet (34); the negative pressure reboiler material inlet (43) is connected to the negative pressure supergravity material outlet (31); the negative pressure reboiler steam outlet (44) is connected to the negative pressure supergravity steam inlet (33); the negative pressure reboiler heat source outlet (45) is connected to the first hot side inlet (73); the negative pressure supergravity material inlet (32) is connected to the first cold side outlet (72); and the negative pressure supergravity steam outlet (34) is connected to the second hot side inlet (62).

4. The countercurrent double-effect distillation system based on high gravity technology according to claim 3, characterized in that: A diaphragm pump (8) is provided between the negative pressure reboiler (4) and the first preheater (7).

5. The countercurrent double-effect distillation system based on high gravity technology according to claim 3, characterized in that: The height of the negative pressure reboiler heat source outlet (45) is higher than the height of the first hot side.

6. The countercurrent double-effect distillation system based on high gravity technology according to claim 1, characterized in that: The operating pressure of the vacuum system (5) is -0.03 MPa to -0.095 MPa.

7. The countercurrent double-effect distillation system based on high gravity technology according to claim 1, characterized in that: The atmospheric pressure reboiler (2) and the negative pressure reboiler (4) are both vertical or horizontal structures.

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