Hydrogen fluoride gas heat exchange device

Abstract

The utility model relates to fluorine chemical industry technical field, concretely relates to a hydrogen fluoride gas heat exchange device. The hydrogen fluoride gas heat exchange device, include: primary heat exchanger, first production pipeline in primary heat exchanger is communicated with the purification tower, primary heat exchanger has first liquid outlet, first liquid outlet is communicated with first production pipeline, still be provided with first heat exchange pipeline in primary heat exchanger, and the export of first heat exchange pipeline is communicated with rectifying column, crude acid tank, crude acid tank is communicated with first liquid outlet through first liquid pipeline, and crude acid tank is communicated with first heat exchange pipeline through crude acid circulating pipeline. The hydrogen fluoride liquid in crude acid tank is used as refrigerant and hydrogen fluoride gas to carry out heat exchange, can effectively save a part of refrigerant, reduce enterprise cost and burden, simultaneously, the hydrogen fluoride liquid after heat exchange sublimes into hydrogen fluoride gas, can carry out secondary impurity removal, still can reduce the steam consumed when heating hydrogen fluoride liquid, further reduced enterprise cost.

Description

Technical Field

[0001] This utility model relates to the field of fluorochemical technology, specifically to a hydrogen fluoride gas heat exchange device. Background Technology

[0002] In the production of hydrogen fluoride, the hydrogen fluoride gas, after being purified in a purification tower, enters a heat exchanger. There, the gas indirectly contacts a refrigerant to exchange heat, causing the gas to condense into liquid hydrogen fluoride. The refrigerant typically used is -5°C brine. The liquid hydrogen fluoride after heat exchange is then reheated for further purification, removing impurities with boiling points higher than hydrogen fluoride. However, this heat exchange process involves a large amount of refrigerant, resulting in high production costs and a significant burden on the company. Utility Model Content

[0003] In view of this, the present invention provides a hydrogen fluoride gas heat exchange device to solve the problem that the large amount of refrigerant used in the heat exchange process leads to high production costs and a heavy burden on enterprises.

[0004] This utility model provides a hydrogen fluoride gas heat exchange device, comprising:

[0005] A primary heat exchanger, wherein a first production pipeline within the primary heat exchanger is connected to a purification tower, the primary heat exchanger has a first liquid outlet connected to the first production pipeline, and a first heat exchange pipeline is also provided within the primary heat exchanger, the outlet of which is connected to a distillation tower.

[0006] The crude acid tank is connected to the first outlet via a first outlet pipeline, and the crude acid tank is connected to the first heat exchange pipeline via a crude acid circulation pipeline.

[0007] In one optional embodiment, the primary heat exchanger is further provided with a purification tower cooling pipeline, one end of which is connected to the first heat exchange pipeline, and the other end of which is connected to the purification tower.

[0008] In one optional embodiment, the system further includes a secondary heat exchanger and a tertiary heat exchanger, wherein the hydrogen fluoride gas in the purification tower passes sequentially through the primary heat exchanger, the secondary heat exchanger, and the tertiary heat exchanger.

[0009] In one optional embodiment, the secondary heat exchanger has a second production pipeline, a second heat exchange pipeline, and a second liquid outlet. The inlet of the second production pipeline is connected to the outlet of the first production pipeline. One end of the second liquid outlet is connected to the second production pipeline, and the other end of the second liquid outlet is connected to the crude acid tank through the second liquid outlet pipeline. The tertiary heat exchanger has a third production pipeline, a third heat exchange pipeline, and a third liquid outlet. The inlet of the third production pipeline is connected to the outlet of the second production pipeline. One end of the third liquid outlet is connected to the third production pipeline, and the other end of the third liquid outlet is connected to the crude acid tank through the third liquid outlet pipeline. The second heat exchange pipeline and the third heat exchange pipeline are respectively connected to a refrigerant output device.

[0010] In one alternative embodiment, the tertiary heat exchanger further includes an impurity discharge port connected to the outlet of the third production pipeline.

[0011] In one optional embodiment, the crude acid tank includes a first tank and a second tank, the first outlet pipe is connected to the first tank, and the second outlet pipe and the third outlet pipe are connected to the second tank.

[0012] In one optional embodiment, the first tank and the second tank are respectively connected to the crude acid circulation pipeline, and the crude acid circulation pipeline is equipped with a crude acid circulation pump.

[0013] In one optional embodiment, the crude acid circulation pipeline includes a main pipeline, a first circulation pipeline, and a second circulation pipeline. One end of the first circulation pipeline and the second circulation pipeline are respectively connected to one end of the main pipeline, and the other end of the main pipeline is connected to the first heat exchange pipeline. The other end of the first circulation pipeline is connected to the first tank and the second tank, and the other end of the second circulation pipeline is connected to the second tank. Crude acid circulation pumps are respectively installed on the first circulation pipeline and the second circulation pipeline.

[0014] In one alternative embodiment, a control valve is provided at the other end of the first circulation pipeline and the second circulation pipeline.

[0015] In one alternative embodiment, a level gauge and a pressure gauge are also provided on the first heat exchange pipeline.

[0016] Beneficial effects:

[0017] 1. This utility model provides a hydrogen fluoride gas heat exchange device, which uses liquid hydrogen fluoride in the crude acid tank as a refrigerant to exchange heat with hydrogen fluoride gas. This can effectively save some refrigerant, reduce enterprise costs and burdens. At the same time, the liquid hydrogen fluoride after heat exchange sublimates into hydrogen fluoride gas, which can be used for secondary impurity removal. Impurities with high boiling points in the liquid hydrogen fluoride cannot be vaporized. Furthermore, the sublimation of liquid hydrogen fluoride and hydrogen fluoride gas through heat exchange can also reduce the steam consumed when heating the liquid hydrogen fluoride, further reducing enterprise costs.

[0018] 2. The cooling pipeline of the purification tower can introduce unsublimated hydrogen fluoride liquid into the purification tower to cool it down and prevent the purification tower from shutting down due to excessive temperature. At the same time, since the hydrogen fluoride liquid still contains impurities, introducing it into the purification tower can remove impurities again, which can effectively improve the purity of hydrogen fluoride. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a hydrogen fluoride gas heat exchange device according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures:

[0022] 1. Primary heat exchanger; 101. First production pipeline; 102. First heat exchange pipeline; 103. First liquid outlet; 104. First liquid outlet pipeline; 105. Purification tower cooling pipeline; 2. Purification tower; 3. Crude acid tank; 301. First tank body; 302. Second tank body; 4. Crude acid circulation pipeline; 401. Main pipeline; 402. First circulation pipeline; 403. Second circulation pipeline; 5. Distillation tower; 6. Secondary heat exchanger; 601. Second production pipeline; 602. Second heat exchange pipeline; 603. Second liquid outlet; 604. Second liquid outlet pipeline; 7. Tertiary heat exchanger; 701. Third production pipeline; 702. Third heat exchange pipeline; 703. Third liquid outlet; 704. Third liquid outlet pipeline; 705. Impurity discharge port; 8. Crude acid circulation pump; 9. Control valve; 10. Level gauge. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] The following is combined Figure 1 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, a hydrogen fluoride gas heat exchange device is provided, comprising: a primary heat exchanger 1 and a coarse acid tank 3.

[0026] Specifically, the first production pipeline 101 within the primary heat exchanger 1 is connected to the purification tower 2. The primary heat exchanger 1 has a first liquid outlet 103, which is connected to the first production pipeline 101. The primary heat exchanger 1 also includes a first heat exchange pipeline 102, the outlet of which is connected to the distillation tower 5. The crude acid tank 3 is connected to the first liquid outlet 103 via a first liquid outlet pipeline 104, and the crude acid tank 3 is connected to the first heat exchange pipeline 102 via a crude acid circulation pipeline 4.

[0027] In this embodiment, the hydrogen fluoride gas, after being purified by the purification tower 2, enters the primary heat exchanger 1 through the first production pipeline 101 for heat exchange, condensing the hydrogen fluoride gas into liquid hydrogen fluoride and collecting it. The refrigerant in the primary heat exchanger 1 is the liquid hydrogen fluoride in the crude acid tank 3. The liquid hydrogen fluoride enters the first heat exchange pipeline 102 in the primary heat exchanger 1 through the crude acid circulation pipeline 4. The liquid hydrogen fluoride in the first heat exchange pipeline 102 and the hydrogen fluoride gas in the first production pipeline 101 indirectly contact each other in the primary heat exchanger 1 for heat exchange. The liquid hydrogen fluoride in the first heat exchange pipeline 102 absorbs the heat of the hydrogen fluoride gas and vaporizes into hydrogen fluoride gas. The hydrogen fluoride gas enters the distillation tower 5 from the outlet of the first heat exchange pipeline 102. The hydrogen fluoride gas in the first production pipeline 101 condenses into liquid hydrogen fluoride and flows into the crude acid tank 3 through the first liquid outlet 103 and the first liquid outlet pipeline 104.

[0028] It should be noted that using the liquid hydrogen fluoride in the crude acid tank 3 as a refrigerant for heat exchange with the hydrogen fluoride gas can effectively save some refrigerant, reducing enterprise costs and burdens. At the same time, the sublimation of the liquid hydrogen fluoride after heat exchange into hydrogen fluoride gas can be used for secondary impurity removal. Impurities with high boiling points in the liquid hydrogen fluoride cannot be vaporized. Furthermore, the sublimation of the liquid hydrogen fluoride and hydrogen fluoride gas through heat exchange can also reduce the steam consumed when heating the liquid hydrogen fluoride, further reducing enterprise costs.

[0029] In one embodiment, the primary heat exchanger 1 is further provided with a purification tower cooling pipeline 105, one end of which is connected to the first heat exchange pipeline 102, and the other end of which is connected to the purification tower 2.

[0030] In this embodiment, as Figure 1 As shown, the purification tower cooling pipe 105 is connected to the first heat exchange pipe 102. The hydrogen fluoride gas in the first heat exchange pipe 102 will enter the distillation tower 5 from the outlet of the first heat exchange pipe 102. The unsublimated hydrogen fluoride liquid in the first heat exchange pipe 102 will enter the purification tower cooling pipe 105 and enter the purification tower 2 along the purification tower cooling pipe 105 to cool the purification tower 2. In the purification tower 2, it will sublimate into hydrogen fluoride gas and then enter the first production pipe 101 for heat exchange.

[0031] It should be noted that the cooling pipe 105 of the purification tower can introduce unsublimated hydrogen fluoride liquid into the purification tower 2 to cool the purification tower 2 and prevent the purification tower 2 from shutting down due to excessive temperature. At the same time, the hydrogen fluoride liquid still contains impurities. Introducing the hydrogen fluoride liquid into the purification tower 2 can remove impurities from the hydrogen fluoride liquid again, which can effectively improve the purity of hydrogen fluoride.

[0032] In one embodiment, it further includes a secondary heat exchanger 6 and a tertiary heat exchanger 7, wherein the hydrogen fluoride gas in the purification tower 2 passes sequentially through the primary heat exchanger 1, the secondary heat exchanger 6 and the tertiary heat exchanger 7.

[0033] In this embodiment, hydrogen fluoride gas cannot be completely condensed in the first-stage heat exchanger 1. Therefore, setting up multiple heat exchangers can fully condense the hydrogen fluoride gas.

[0034] In one embodiment, the secondary heat exchanger 6 has a second production pipeline 601, a second heat exchange pipeline 602, and a second liquid outlet 603. The inlet of the second production pipeline 601 is connected to the outlet of the first production pipeline 101. One end of the second liquid outlet 603 is connected to the second production pipeline 601, and the other end of the second liquid outlet 603 is connected to the crude acid tank 3 through the second liquid outlet pipeline 604. The tertiary heat exchanger 7 has a third production pipeline 701, a third heat exchange pipeline 702, and a third liquid outlet 703. The inlet of the third production pipeline 701 is connected to the outlet of the second production pipeline 601. One end of the third liquid outlet 703 is connected to the third production pipeline 701, and the other end of the third liquid outlet 703 is connected to the crude acid tank 3 through the third liquid outlet pipeline 704. The second heat exchange pipeline 602 and the third heat exchange pipeline 702 are respectively connected to a refrigerant output device.

[0035] In this embodiment, as Figure 1As shown, the refrigerant in the second heat exchange pipe 602 and the third heat exchange pipe 702 is -5° salt water. The inlet and outlet of the second heat exchange pipe 602 and the third heat exchange pipe 702 are connected to a refrigerant output device (not shown). The refrigerant output device is a refrigeration unit. The refrigerant in the refrigeration unit enters the secondary heat exchanger 6 and the tertiary heat exchanger 7 through the second heat exchange pipe 602 and the third heat exchange pipe 702, and exchanges heat with the hydrogen fluoride gas in the second production pipe 601 and the third production pipe 701, so that the hydrogen fluoride gas in the second production pipe 601 and the third production pipe 701 condenses into hydrogen fluoride liquid. The inlet of the second production pipeline 601 is connected to the outlet of the first production pipeline 101. Uncondensed hydrogen fluoride gas in the first production pipeline 101 enters the second production pipeline 601 and then exchanges heat with the refrigerant in the second heat exchange pipeline 602 in the secondary heat exchanger 6. The condensed hydrogen fluoride liquid in the second production pipeline 601 flows into the crude acid tank 3 through the second liquid outlet 603 and the second liquid outlet pipeline 604. The inlet of the third production pipeline 701 is connected to the outlet of the second production pipeline 601. Uncondensed hydrogen fluoride gas in the second production pipeline 601 enters the third production pipeline 701 and then exchanges heat with the refrigerant in the third heat exchange pipeline 702 in the tertiary heat exchanger 7. The condensed hydrogen fluoride liquid in the third production pipeline 701 flows into the crude acid tank 3 through the third liquid outlet 703 and the third liquid outlet pipeline 704.

[0036] In this embodiment, as Figure 1 As shown, the three-stage heat exchanger 7 also has an impurity discharge port 705, which is connected to the outlet of the third production pipeline 701. After three condensations, the hydrogen fluoride in the hydrogen fluoride gas has basically condensed into liquid hydrogen fluoride. The gas will carry the remaining impurities and be discharged from the three-stage heat exchanger 7 through the impurity discharge port 705. The gas is collected, treated to be harmless, and then discharged.

[0037] In this embodiment, as Figure 1 As shown, the crude acid tank 3 includes a first tank body 301 and a second tank body 302. A first outlet pipe 104 is connected to the first tank body 301, and a second outlet pipe 604 and a third outlet pipe 704 are connected to the second tank body 302. The separation of the first tank body 301 and the second tank body 302 prevents the hydrogen fluoride liquid from accumulating in one crude acid tank 3, which could lead to an excessively high liquid level and overflow.

[0038] In this embodiment, as Figure 1 As shown, the first tank 301 and the second tank 302 are respectively connected to the crude acid circulation pipeline 4, and the crude acid circulation pipeline 4 is equipped with a crude acid circulation pump 8. The crude acid circulation pump 8 can pump the hydrogen fluoride liquid in the first tank 301 and the second tank 302 into the crude acid circulation pipeline 4.

[0039] In one embodiment, the crude acid circulation pipeline 4 includes a main pipeline 401, a first circulation pipeline 402, and a second circulation pipeline 403. One end of the first circulation pipeline 402 and the second circulation pipeline 403 are respectively connected to one end of the main pipeline 401, and the other end of the main pipeline 401 is connected to the first heat exchange pipeline 102. The other end of the first circulation pipeline 402 is respectively connected to the first tank 301 and the second tank 302, and the other end of the second circulation pipeline 403 is connected to the second tank 302. Crude acid circulation pumps 8 are respectively installed on the first circulation pipeline 402 and the second circulation pipeline 403.

[0040] In this embodiment, as Figure 1 As shown, the outlet of the main pipeline 401 is connected to the inlet of the first heat exchange pipeline 102, and the inlet of the main pipeline 401 is connected to the outlets of the first circulation pipeline 402 and the second circulation pipeline 403. Both the first tank 301 and the second tank 302 have outlet pipes (not shown). The inlet of the first circulation pipeline 402 is connected to the outlet pipes of both the first and second tanks 301 and 302, respectively. The inlet of the second circulation pipeline 403 is connected to the outlet pipe of the second tank 302. The inlet of the second circulation pipeline 403 is located between the inlet of the first circulation pipeline 402 and the second tank 302. Crude acid circulation pumps 8 are respectively installed on the first circulation pipeline 402 and the second circulation pipeline 403. Either one or both of the two crude acid circulation pumps 8 can be turned on. When the crude acid circulation pump 8 on the first circulation pipeline 402 is turned on, the first... Hydrogen fluoride liquid in tank 301 and tank 302 can be drawn into the first circulation pipeline 402; when the crude acid circulation pump 8 on the second circulation pipeline 403 is turned on, hydrogen fluoride liquid in the second tank 302 can be drawn into the second circulation pipeline 403; when the crude acid circulation pumps 8 on the first circulation pipeline 402 and the second circulation pipeline 403 are turned on at the same time, hydrogen fluoride liquid in the first tank 301 can be drawn into the first circulation pipeline 402. Since the inlet of the second circulation pipeline 403 is located between the inlet of the first circulation pipeline 402 and the second tank 302, most of the hydrogen fluoride liquid in the second tank 302 is drawn into the second circulation pipeline 403, and a very small portion enters the first circulation pipeline 402. Turning on both crude acid circulation pumps 8 at the same time can increase the flow rate of hydrogen fluoride liquid in the first heat exchange pipeline 102.

[0041] In this embodiment, as Figure 1 As shown, a control valve 9 is provided at the other end of the first circulation pipeline 402 and the second circulation pipeline 403.

[0042] Specifically, a control valve 9 is provided at the connection between the inlet of the first circulation pipeline 402 and the outlet pipe of the first tank 301 and the second tank 302, and a control valve 9 is provided at the connection between the second circulation pipeline 403 and the outlet pipe of the second tank 302. Both the control valve 9 and the crude acid circulation pump 8 are connected to a PLC controller (not shown) by signal. The PLC controller can control the opening or closing of different control valves 9 and different crude acid circulation pumps 8 to be suitable for various scenarios.

[0043] In this embodiment, as Figure 1 As shown, a level gauge 10 and a pressure gauge (not shown) are also installed on the first heat exchange pipe 102. The level gauge 10 can display the liquid level of hydrogen fluoride liquid in the first heat exchange pipe 102 to facilitate observation of the evaporation of hydrogen fluoride liquid, and the pressure gauge can facilitate observation of the pressure value in the first heat exchange pipe 102.

[0044] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A hydrogen fluoride gas heat exchange device, characterized in that, include: A primary heat exchanger (1) is provided, wherein a first production pipeline (101) is connected to a purification tower (2), the primary heat exchanger (1) has a first liquid outlet (103) connected to the first production pipeline (101), and a first heat exchange pipeline (102) is also provided in the primary heat exchanger (1), wherein the outlet of the first heat exchange pipeline (102) is connected to a distillation tower (5). The crude acid tank (3) is connected to the first liquid outlet (103) through the first liquid outlet pipe (104), and the crude acid tank (3) is connected to the first heat exchange pipe (102) through the crude acid circulation pipe (4).

2. The hydrogen fluoride gas heat exchanger according to claim 1, characterized in that, The primary heat exchanger (1) is also provided with a purification tower cooling pipeline (105), one end of which is connected to the first heat exchange pipeline (102), and the other end of which is connected to the purification tower (2).

3. The hydrogen fluoride gas heat exchanger according to claim 1 or 2, characterized in that, Also includes: The hydrogen fluoride gas in the purification tower (2) passes through the primary heat exchanger (1), the secondary heat exchanger (6), and the tertiary heat exchanger (7) in sequence.

4. The hydrogen fluoride gas heat exchanger according to claim 3, characterized in that, The secondary heat exchanger (6) has a second production pipeline (601), a second heat exchange pipeline (602), and a second liquid outlet (603). The inlet of the second production pipeline (601) is connected to the outlet of the first production pipeline (101). One end of the second liquid outlet (603) is connected to the second production pipeline (601), and the other end of the second liquid outlet (603) is connected to the crude acid tank (3) through the second liquid outlet pipeline (604). The tertiary heat exchanger (7) has a third production pipeline (602). 701), a third heat exchange pipeline (702) and a third liquid outlet (703), the inlet of the third production pipeline (701) is connected to the outlet of the second production pipeline (601), one end of the third liquid outlet (703) is connected to the third production pipeline (701), and the other end of the third liquid outlet (703) is connected to the crude acid tank (3) through the third liquid outlet pipeline (704). The second heat exchange pipeline (602) and the third heat exchange pipeline (702) are respectively connected to the refrigerant output device.

5. The hydrogen fluoride gas heat exchanger according to claim 4, characterized in that, The third-stage heat exchanger (7) also has an impurity discharge port (705), which is connected to the outlet of the third production pipeline (701).

6. The hydrogen fluoride gas heat exchanger according to claim 4, characterized in that, The crude acid tank (3) includes a first tank body (301) and a second tank body (302). The first liquid outlet pipe (104) is connected to the first tank body (301), and the second liquid outlet pipe (604) and the third liquid outlet pipe (704) are connected to the second tank body (302).

7. The hydrogen fluoride gas heat exchanger according to claim 6, characterized in that, The first tank (301) and the second tank (302) are respectively connected to the crude acid circulation pipeline (4), and a crude acid circulation pump (8) is provided on the crude acid circulation pipeline (4).

8. The hydrogen fluoride gas heat exchanger according to claim 7, characterized in that, The crude acid circulation pipeline (4) includes a main pipeline (401), a first circulation pipeline (402), and a second circulation pipeline (403). One end of the first circulation pipeline (402) and the second circulation pipeline (403) are respectively connected to one end of the main pipeline (401), and the other end of the main pipeline (401) is connected to the first heat exchange pipeline (102). The other end of the first circulation pipeline (402) is respectively connected to the first tank (301) and the second tank (302), and the other end of the second circulation pipeline (403) is connected to the second tank (302). Crude acid circulation pumps (8) are respectively installed on the first circulation pipeline (402) and the second circulation pipeline (403).

9. The hydrogen fluoride gas heat exchanger according to claim 8, characterized in that, A control valve (9) is provided at the other end of the first circulation pipeline (402) and the second circulation pipeline (403).

10. The hydrogen fluoride gas heat exchanger according to claim 1, characterized in that, The first heat exchange pipeline (102) is also equipped with a level gauge (10) and a pressure gauge.

Images