A pre-purified acid circulation device

Abstract

This utility model relates to the field of hydrogen fluoride gas impurity removal technology, specifically to an acid circulation device for a pre-purification tower. The pre-purification tower acid circulation device includes: a circulating acid storage tank, the inlet of which is connected to the bottom of the pre-purification tower, and the outlet of which is connected to a spray assembly within the pre-purification tower via an acid circulation pipe; the circulating acid storage tank is a vertical structure. An auxiliary acid storage tank is also included, with its inlet connected to the outlet of the circulating acid storage tank via an auxiliary branch pipe, and a branch pump installed on the auxiliary branch pipe. Connecting the auxiliary branch pipe to the outlet of the circulating acid storage tank allows sulfuric acid in the circulating acid storage tank to directly enter the auxiliary branch pipe without needing to connect it to the acid circulation pipe, thus avoiding affecting the spray volume of the spray assembly in the pre-purification tower. Furthermore, designing the circulating acid storage tank vertically and installing a branch pump on the auxiliary branch pipe effectively increases the flow rate in the auxiliary branch pipe without affecting the flow rate of sulfuric acid in the acid circulation pipe.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen fluoride gas impurity removal technology, specifically to a pre-purification tower acid circulation device. Background Technology

[0002] In the process of hydrogen fluoride production, crude hydrogen fluoride gas needs to be washed and purified in a pre-purification tower to complete the initial purification. Crude hydrogen fluoride gas enters from the bottom of the pre-purification tower and exits from the top. During this process, sulfuric acid is sprayed from the spray structure at the top of the pre-purification tower. The sulfuric acid comes into contact with the crude hydrogen fluoride gas and carries away the water and dust in the gas, thus completing the initial purification of the crude hydrogen fluoride gas. The sulfuric acid flows from the bottom of the pre-purification tower into the circulating acid storage tank, where the dust in the sulfuric acid is deposited. The sulfuric acid then re-enters the spray structure through the circulation pipeline. Because the sulfuric acid absorbs the moisture in the crude hydrogen fluoride gas, the liquid level in the circulating acid storage tank will continuously rise, posing a risk of overflow. Therefore, an auxiliary branch pipe needs to be connected to the circulation pipeline to discharge excess sulfuric acid from the circulating acid storage tank. However, due to the small flow rate of the auxiliary branch pipe, sulfuric acid will still enter the spray structure through the circulation pipeline. To increase the flow rate of the auxiliary branch pipe, the opening of the circulation pipeline can be reduced. However, this will reduce the flow rate of the circulation pipeline, resulting in a decrease in the amount of sulfuric acid sprayed in the purification tower, which will not achieve an effective washing and impurity removal effect. Summary of the Invention

[0003] In view of this, the present invention provides a pre-purification tower acid circulation device to solve the problem that in order to increase the flow rate of the auxiliary branch pipe, the opening of the circulation pipeline can be reduced, but this will result in a smaller flow rate in the circulation pipeline, which will reduce the amount of sulfuric acid sprayed in the purification tower and fail to achieve an effective washing and impurity removal effect.

[0004] This utility model provides a pre-purification tower acid circulation device, comprising:

[0005] A circulating acid storage tank, the inlet of which is connected to the bottom of the pre-purification tower, and the outlet of which is connected to the spray assembly inside the pre-purification tower through an acid circulation pipe, the circulating acid storage tank having a vertical structure;

[0006] An auxiliary acid storage tank is provided, the inlet of which is connected to the outlet of the circulating acid storage tank via an auxiliary branch pipe, and a branch pump is installed on the auxiliary branch pipe.

[0007] In one alternative embodiment, a control valve is provided on the auxiliary branch pipe, and the control valve is connected to the control system signal.

[0008] In one optional embodiment, a level gauge is installed in the circulating acid storage tank, and the level gauge is signal-connected to the control system.

[0009] In one optional embodiment, a weighing meter is also provided in the circulating acid storage tank, and the weighing meter is signal-connected to the control system.

[0010] In one optional embodiment, the auxiliary branch pipe includes a first auxiliary main pipe, a second auxiliary main pipe, a first auxiliary branch pipe, and a second auxiliary branch pipe. The inlet end of the first auxiliary main pipe is connected to the outlet of the circulating acid storage tank. The inlet ends of the first auxiliary branch pipe and the second auxiliary branch pipe are connected to the outlet of the first auxiliary main pipe. A branch pump is respectively installed on the first auxiliary branch pipe and the second auxiliary branch pipe. The outlet ends of the first auxiliary branch pipe and the second auxiliary branch pipe are respectively connected to the inlet end of the second auxiliary main pipe. The outlet end of the second auxiliary main pipe is connected to the inlet of the auxiliary acid storage tank.

[0011] In one optional embodiment, the inlet ends of the first auxiliary branch pipe and the second auxiliary branch pipe are respectively provided with control valves, and the control valves are connected to the control system.

[0012] In one alternative embodiment, a circulation pump is provided on the acid circulation pipe.

[0013] In one optional embodiment, the acid circulation pipe includes a first circulation main pipe, a second circulation main pipe, a first circulation branch pipe, and a second circulation branch pipe. The inlet end of the first circulation main pipe is connected to the outlet of the circulating acid storage tank. The outlet end of the first circulation main pipe is connected to the inlet ends of the first circulation branch pipe and the second circulation branch pipe, respectively. The inlet end of the second circulation main pipe is connected to the outlet ends of the first circulation branch pipe and the second circulation branch pipe. The outlet end of the second circulation main pipe is connected to the spray assembly in the pre-purification tower. The first circulation branch pipe and the second circulation branch pipe are each equipped with a circulation pump.

[0014] In one optional embodiment, the inlet ends of the first circulation branch pipe and the second circulation branch pipe are respectively provided with control valves, and the control valves are connected to the control system signal.

[0015] In one alternative embodiment, the bottom of the pre-purification tower is connected to the inlet of the tower circulation acid storage tank via an acid discharge pipe.

[0016] Beneficial effects:

[0017] 1. This utility model provides a pre-purification tower acid circulation device, which connects the auxiliary branch pipe to the outlet of the circulating acid storage tank, so that the sulfuric acid in the circulating acid storage tank can directly enter the auxiliary branch pipe without connecting the auxiliary branch pipe to the acid circulation pipe, thus avoiding affecting the spray volume of the spray components in the pre-purification tower. At the same time, the circulating acid storage tank is designed as a vertical structure, and a branch pump is installed on the auxiliary branch pipe, which can effectively increase the flow rate of the auxiliary branch pipe without affecting the flow rate of sulfuric acid in the acid circulation pipe.

[0018] 2. The pre-purification tower acid circulation device of this utility model can obtain the liquid level information in the circulating acid storage tank through a level gauge or a weighing meter, and can also obtain more accurate information through the parameters of the level gauge and the weighing meter, thereby improving accuracy.

[0019] 3. The pre-purification tower acid circulation device of this utility model, by setting a first auxiliary branch pipe and a second auxiliary branch pipe, allows the second auxiliary branch pipe to be used when the first auxiliary branch pipe is under maintenance, avoiding the situation where it cannot be used due to pipeline maintenance or repair. Furthermore, by simultaneously opening the first auxiliary branch pipe and the second auxiliary branch pipe, the flow rate of sulfuric acid in the second auxiliary main pipe can be increased, which can quickly reduce the liquid level in the circulating acid storage tank.

[0020] 4. The pre-purification tower acid circulation device of this utility model, by setting a first circulation branch pipe and a second circulation branch pipe, allows the second circulation branch pipe to be used when the first circulation branch pipe is under maintenance, avoiding the situation where it cannot be used due to pipeline maintenance or repair. Furthermore, by simultaneously opening the first circulation branch pipe and the second circulation branch pipe, the flow rate of sulfuric acid in the second circulation main pipe can be increased, thereby increasing the spray volume of the spraying assembly. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of a pre-purification tower acid circulation device according to an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Circulating acid storage tank; 2. Pre-purification tower; 3. Acid circulation pipe; 301. First circulation main pipe; 302. Second circulation main pipe; 303. First circulation branch pipe; 304. Second circulation branch pipe; 4. Auxiliary acid storage tank; 5. Auxiliary branch pipe; 501. First auxiliary main pipe; 502. Second auxiliary main pipe; 503. First auxiliary branch pipe; 504. Second auxiliary branch pipe; 6. Branch pump; 7. Control valve; 8. Level gauge; 9. Weighing gauge; 10. Circulating pump; 11. Acid discharge pipe. Detailed Implementation

[0025] 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.

[0026] The following is combined Figure 1 The following describes embodiments of the present invention.

[0027] According to an embodiment of the present invention, a pre-purification tower 2 acid circulation device is provided, including a circulating acid storage tank 1 and an auxiliary acid storage tank 4.

[0028] Specifically, the inlet of the circulating acid storage tank 1 is connected to the bottom of the pre-purification tower 2, and the outlet of the circulating acid storage tank 1 is connected to the spray assembly inside the pre-purification tower 2 through the acid circulation pipe 3. The inlet of the auxiliary acid storage tank 4 is connected to the outlet of the circulating acid storage tank 1 through the auxiliary branch pipe 5, and a branch pump 6 is installed on the auxiliary branch pipe 5.

[0029] In this embodiment, the sulfuric acid, after being washed and purified in the pre-purification tower 2, enters the circulating acid storage tank 1 through the acid discharge pipe 11. The outlet of the circulating acid storage tank 1 is connected to the inlet of the auxiliary branch pipe 5 and the acid circulation pipe 3, respectively. A portion of the sulfuric acid in the circulating acid storage tank 1 enters the auxiliary branch pipe 5 directly from the outlet of the circulating acid storage tank 1, and then enters the auxiliary acid storage tank 4 for storage along the auxiliary branch pipe 5. A portion of the sulfuric acid in the circulating acid storage tank 1 enters the acid circulation pipe 3 directly from the outlet of the circulating acid storage tank 1, and then enters the spray assembly (not shown) in the pre-purification tower 2 along the acid circulation pipe 3. A branch pump 6 is installed on the auxiliary branch pipe 5. When the liquid level in the circulating acid storage tank 1 is too high, turning on the branch pump 6 can increase the flow rate of sulfuric acid in the auxiliary branch pipe 5.

[0030] Specifically, the circulating acid storage tank 1 has a vertical structure. The sulfuric acid in the circulating acid storage tank 1 will automatically flow into the outlet of the circulating acid storage tank 1 due to pressure and enter the auxiliary branch pipe 5 and the acid circulation pipe 3. The pressure at the outlet of the circulating acid storage tank 1 is positive pressure, and the pressure in the auxiliary branch pipe 5 is also positive pressure. Even without the branch pump 6, the sulfuric acid can flow in the auxiliary branch pipe 5. The branch pump 6 is to accelerate the flow of sulfuric acid in the auxiliary branch pipe 5, rather than to use negative pressure to draw sulfuric acid from the outlet of the circulating acid storage tank 1. When the flow rate in the auxiliary branch pipe 5 increases, the flow rate of sulfuric acid at the outlet of the circulating acid storage tank 1 will also increase, so it will not affect the flow rate of sulfuric acid in the acid circulation pipe 3.

[0031] It should be noted that connecting the auxiliary branch pipe 5 to the outlet of the circulating acid storage tank 1 allows the sulfuric acid in the circulating acid storage tank 1 to directly enter the auxiliary branch pipe 5 without connecting the auxiliary branch pipe 5 to the acid circulation pipe 3, thus avoiding affecting the spray volume of the spray components in the pre-purification tower 2. At the same time, setting the circulating acid storage tank 1 to a vertical structure and installing a branch pump 6 on the auxiliary branch pipe 5 can effectively increase the flow rate of the auxiliary branch pipe 5 without affecting the flow rate of sulfuric acid in the acid circulation pipe 3.

[0032] In one embodiment, a control valve 7 is provided on the auxiliary branch pipe 5, and the control valve 7 is connected to the control system signal.

[0033] In this embodiment, as Figure 1 As shown, when the liquid level in the circulating acid storage tank 1 is too high, the control system (not shown) can control the control valve 7 to open the auxiliary branch pipe 5, allowing sulfuric acid from the circulating acid storage tank 1 to flow into the auxiliary branch pipe 5. The control system is signal-connected to the branch pump 6, and can control the branch pump 6 to open, increasing the flow rate of sulfuric acid in the auxiliary branch pipe 5. Preferably, the control system is a PLC controller.

[0034] In one embodiment, a level gauge 8 is installed in the circulating acid storage tank 1, and the level gauge 8 is connected to the control system signal.

[0035] In this embodiment, as Figure 1 As shown, the control system can obtain the liquid level information in the circulating acid storage tank 1 through the liquid level gauge 8. The control system can control the control valve 7 to open or close the auxiliary branch pipe 5 according to the information, or start or close the branch pump 6 when the auxiliary branch pipe 5 is opened.

[0036] In one embodiment, a weighing meter 9 is also provided in the circulating acid storage tank 1, and the weighing meter 9 is connected to the control system signal.

[0037] In this embodiment, as Figure 1 As shown, the control system can obtain the liquid level information in the circulating acid storage tank 1 through the liquid level gauge 8 or the weighing gauge 9, and can also obtain more accurate information through the parameters of the liquid level gauge 8 and the weighing gauge 9, thereby improving accuracy.

[0038] In one embodiment, the auxiliary branch pipe 5 includes a first auxiliary main pipe 501, a second auxiliary main pipe 502, a first auxiliary branch pipe 503, and a second auxiliary branch pipe 504. The inlet end of the first auxiliary main pipe 501 is connected to the outlet of the circulating acid storage tank 1. The inlet ends of the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504 are connected to the outlet of the first auxiliary main pipe 501. A branch pump 6 is respectively installed on the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504. The outlet ends of the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504 are respectively connected to the inlet end of the second auxiliary main pipe 502. The outlet end of the second auxiliary main pipe 502 is connected to the inlet of the auxiliary acid storage tank 4.

[0039] In this embodiment, as Figure 1 As shown, sulfuric acid in the circulating acid storage tank 1 can sequentially enter the auxiliary acid storage tank 4 through the first auxiliary main pipe 501, the first auxiliary branch pipe 503, and the second auxiliary main pipe 502; it can also sequentially enter the auxiliary acid storage tank 4 through the first auxiliary main pipe 501, the second auxiliary branch pipe 504, and the second auxiliary main pipe 502; and the sulfuric acid in the first auxiliary main pipe 501 simultaneously enters the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504, and then enters the second auxiliary main pipe 502. It should be noted that by setting the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504, the second auxiliary branch pipe 504 can be used when the first auxiliary branch pipe 503 is under maintenance, avoiding situations where the pipe cannot be used due to maintenance or repair. Furthermore, simultaneously opening the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504 can increase the flow rate of sulfuric acid in the second auxiliary main pipe 502, which can quickly reduce the liquid level in the circulating acid storage tank 1.

[0040] In one embodiment, the inlet ends of the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504 are respectively provided with control valves 7, and the control valves 7 are connected to the control system.

[0041] In this embodiment, as Figure 1 As shown, the control system can control the opening or closing of the control valve 7 of the first auxiliary branch pipe 503 and the second auxiliary branch pipe 504, so that sulfuric acid can flow into the auxiliary acid storage tank 4 through different pipelines.

[0042] In one embodiment, a circulation pump 10 is provided on the acid circulation pipe 3.

[0043] In one embodiment, the acid circulation pipe 3 includes a first circulation main pipe 301, a second circulation main pipe 302, a first circulation branch pipe 303, and a second circulation branch pipe 304. The inlet end of the first circulation main pipe 301 is connected to the outlet of the circulating acid storage tank 1. The outlet end of the first circulation main pipe 301 is connected to the inlet ends of the first circulation branch pipe 303 and the second circulation branch pipe 304, respectively. The inlet end of the second circulation main pipe 302 is connected to the outlet ends of the first circulation branch pipe 303 and the second circulation branch pipe 304. The outlet end of the second circulation main pipe 302 is connected to the spray assembly in the pre-purification tower 2. The first circulation branch pipe 303 and the second circulation branch pipe 304 are respectively equipped with circulation pumps 10.

[0044] In this embodiment, as Figure 1As shown, sulfuric acid in the circulating acid storage tank 1 can sequentially enter the spray assembly through the first circulating main pipe 301, the first circulating branch pipe 303, and the second circulating main pipe 302; it can also sequentially enter the spray assembly through the first circulating main pipe 301, the second circulating branch pipe 304, and the second circulating main pipe 302; and the sulfuric acid in the first circulating main pipe 301 simultaneously enters the first circulating branch pipe 303 and the second circulating branch pipe 304, and then enters the second circulating main pipe 302. It should be noted that by setting the first circulating branch pipe 303 and the second circulating branch pipe 304, the second circulating branch pipe 304 can be used when the first circulating branch pipe 303 is under maintenance, avoiding situations where it cannot be used due to pipeline maintenance or repair. Furthermore, simultaneously opening the first circulating branch pipe 303 and the second circulating branch pipe 304 can increase the flow rate of sulfuric acid in the second circulating main pipe 302, thereby increasing the spray volume of the spray assembly. The circulating pump 10 is signal-connected to the control system, which can control the opening and closing of the circulating pump 10.

[0045] In one embodiment, the inlet ends of the first circulation branch pipe 303 and the second circulation branch pipe 304 are respectively provided with control valves 7, and the control valves 7 are connected to the control system signal.

[0046] In this embodiment, as Figure 1 As shown, the control system can control the opening or closing of the control valve 7 of the first circulation branch pipe 303 and the second circulation branch pipe 304, so that sulfuric acid can flow into the spray assembly through different pipelines.

[0047] 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 pre-purification tower acid circulation device characterized by comprising: include: A circulating acid storage tank (1) has an inlet that is connected to the bottom of the pre-purification tower (2) and an outlet that is connected to the spray assembly inside the pre-purification tower (2) via an acid circulation pipe (3). The circulating acid storage tank (1) is a vertical structure. An auxiliary acid storage tank (4) is provided. The inlet of the auxiliary acid storage tank (4) is connected to the outlet of the circulating acid storage tank (1) through an auxiliary branch pipe (5). A branch pump (6) is provided on the auxiliary branch pipe (5).

2. The pre-purification column acid circulation device according to claim 1, characterized by, The auxiliary branch pipe (5) is equipped with a control valve (7), which is connected to the control system signal.

3. The pre-purification tower acid circulation device according to claim 2, characterized by, The circulating acid storage tank (1) is equipped with a level gauge (8), which is connected to the control system.

4. The pre-purification tower acid circulation device according to claim 3, characterized by, The circulating acid storage tank (1) is also equipped with a weighing meter (9), which is connected to the control system signal.

5. The pre-purification tower acid circulation device according to claim 1, characterized by, The auxiliary branch pipe (5) includes a first auxiliary main pipe (501), a second auxiliary main pipe (502), a first auxiliary branch pipe (503), and a second auxiliary branch pipe (504). The inlet end of the first auxiliary main pipe (501) is connected to the outlet of the circulating acid storage tank (1). The inlet ends of the first auxiliary branch pipe (503) and the second auxiliary branch pipe (504) are connected to the outlet of the first auxiliary main pipe (501). A branch pump (6) is respectively installed on the first auxiliary branch pipe (503) and the second auxiliary branch pipe (504). The outlet ends of the first auxiliary branch pipe (503) and the second auxiliary branch pipe (504) are respectively connected to the inlet end of the second auxiliary main pipe (502). The outlet end of the second auxiliary main pipe (502) is connected to the inlet of the auxiliary acid storage tank (4).

6. The pre-purification tower acid circulation device according to claim 5, characterized in that, The inlet ends of the first auxiliary branch pipe (503) and the second auxiliary branch pipe (504) are respectively provided with control valves (7), and the control valves (7) are connected to the control system.

7. The pre-purification tower acid circulation device according to claim 1, characterized in that, A circulation pump (10) is installed on the acid circulation pipe (3).

8. The pre-purification tower acid circulation device according to claim 1 or 7, characterized in that, The acid circulation pipe (3) includes a first circulation main pipe (301), a second circulation main pipe (302), a first circulation branch pipe (303), and a second circulation branch pipe (304). The inlet end of the first circulation main pipe (301) is connected to the outlet of the circulating acid storage tank (1). The outlet end of the first circulation main pipe (301) is connected to the inlet ends of the first circulation branch pipe (303) and the second circulation branch pipe (304), respectively. The inlet end of the second circulation main pipe (302) is connected to the outlet ends of the first circulation branch pipe (303) and the second circulation branch pipe (304). The outlet end of the second circulation main pipe (302) is connected to the spray assembly in the pre-purification tower (2). The first circulation branch pipe (303) and the second circulation branch pipe (304) are respectively equipped with circulation pumps (10).

9. The pre-purification tower acid circulation device according to claim 8, characterized in that, The inlet ends of the first circulation branch pipe (303) and the second circulation branch pipe (304) are respectively provided with control valves (7), and the control valves (7) are connected to the control system signal.

10. The pre-purification tower acid circulation device according to claim 1, characterized in that, The bottom of the pre-purification tower (2) is connected to the inlet of the circulating acid storage tank (1) via an acid discharge pipe (11).

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