Preheating device for adding hydrofluoric acid into electrolytic tank and hydrofluoric acid electrolysis system

Abstract

The utility model relates to an electrolytic bath hydrofluoric acid adding preheating device and a hydrofluoric acid electrolysis system, the device comprises an acid adding pipe, one end of the acid adding pipe is connected to a hydrofluoric acid large tank, and the other end of the acid adding pipe is connected to an electrolytic bath; the heating device is arranged at one end, close to the hydrofluoric acid large tank, of the acid adding pipe. When hydrofluoric acid needs to be conveyed from the large hydrofluoric acid tank to the electrolytic bath for electrolysis, the hydrofluoric acid is conveyed from the large hydrofluoric acid tank to the electrolytic bath through the acid adding pipe, meanwhile, the heating device is arranged at the end, close to the large hydrofluoric acid tank, of the acid adding pipe, and the liquid hydrofluoric acid in the heating pipe is heated through the heating device; liquid hydrofluoric acid is heated into gaseous hydrofluoric acid, so that in the hydrofluoric acid conveying process, condensate water cannot be generated by the acid adding pipe due to low temperature, the risk of equipment damage is reduced, meanwhile, gaseous hydrofluoric acid is added into the electrolytic bath, and the electrolytic efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrofluoric acid electrolysis, in particular to a hydrofluoric acid preheating device for electrolytic cell and a hydrofluoric acid electrolysis system. BACKGROUND

[0002] The conventional method for preparing fluorine gas is electrolysis, and the electrolyte is a molten mixture of potassium bifluoride or sodium bifluoride and hydrogen fluoride. However, the existing electrolytic cell adds hydrofluoric acid directly from a hydrofluoric acid tank through a pipeline. However, the hydrofluoric acid tank usually stores liquid hydrofluoric acid, and the temperature of the liquid hydrofluoric acid is low. During the process of transporting hydrofluoric acid through the pipeline, condensate water will be generated on the pipeline due to the low temperature of the pipeline, and the condensate water falling on the cover electrode may cause short circuit. At the same time, the electrolysis efficiency of liquid hydrofluoric acid in the electrolytic cell is lower than that of gaseous hydrofluoric acid, resulting in low electrolysis efficiency. CONTENT OF THE INVENTION

[0003] In view of the above problems, the present application provides a hydrofluoric acid preheating device for electrolytic cell and a hydrofluoric acid electrolysis system, which solves the problems of condensate water generated in the pipeline due to low temperature and low electrolysis efficiency of liquid hydrofluoric acid in the electrolytic cell during the process of transporting liquid hydrofluoric acid from a hydrofluoric acid tank to an electrolytic cell.

[0004] To achieve the above-mentioned purpose, the inventors provide a hydrofluoric acid preheating device for electrolytic cell, comprising:

[0005] An acid feeding pipe, one end of the acid feeding pipe is connected to a hydrofluoric acid tank, and the other end of the acid feeding pipe is connected to an electrolytic cell;

[0006] A heating device, the heating device is arranged on the acid feeding pipe close to one end of the hydrofluoric acid tank.

[0007] In some embodiments, the heating device comprises:

[0008] A heat exchanger, the heat exchanger is arranged on the acid feeding pipe;

[0009] A heat exchange pipe, the heat exchange pipe is arranged in the heat exchanger.

[0010] In some embodiments, the water inlet of the heat exchange pipe is connected to the water outlet of the temperature control device of the electrolytic cell, and the water outlet of the heat exchange pipe is connected to a hot water tank.

[0011] In some embodiments, the heat exchange pipe is arranged in an S shape in the heat exchanger.

[0012] Another technical solution is also provided, a hydrofluoric acid electrolysis system, comprising:

[0013] An electrolytic cell, the electrolytic cell is used for electrolyzing hydrofluoric acid;

[0014] a large hydrofluoric acid tank for storing liquid hydrofluoric acid;

[0015] an acid feeding pipe, one end of which is connected to the large hydrofluoric acid tank and the other end of which is connected to the electrolytic tank;

[0016] a heating device arranged on the acid feeding pipe close to the large hydrofluoric acid tank.

[0017] In some embodiments, the heating device comprises:

[0018] a heat exchanger arranged on the acid feeding pipe;

[0019] a heat exchange pipe arranged in the heat exchanger.

[0020] In some embodiments, the water inlet of the heat exchange pipe is connected to the water outlet of the temperature control device of the electrolytic tank, and the water outlet of the heat exchange pipe is connected to the hot water tank.

[0021] In some embodiments, the heat exchange pipe is arranged in an S shape in the heat exchanger.

[0022] Compared with the prior art, the above technical solution, when hydrofluoric acid needs to be transported from the large hydrofluoric acid tank to the electrolytic tank for electrolysis, the hydrofluoric acid is transported from the large hydrofluoric acid tank to the electrolytic tank through the acid feeding pipe, and a heating device is arranged on the acid feeding pipe close to the large hydrofluoric acid tank, which heats the liquid hydrofluoric acid in the heating pipe, heats the liquid hydrofluoric acid into gaseous hydrofluoric acid, and thus prevents the acid feeding pipe from producing condensed water due to low temperature during the transportation of hydrofluoric acid, reducing the risk of equipment damage, and adding gaseous hydrofluoric acid to the electrolytic tank, improving the electrolysis efficiency.

[0023] The above content related to the utility model is only a summary of the technical solution of the present application. In order to enable those skilled in the art to more clearly understand the technical solution of the present application, and then implement the content recorded in the specification and drawings, and in order to make the above and other purposes, features and advantages of the present application more easily understood, the following will be described in combination with the specific embodiments of the present application and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings are only used to show the principles, implementation methods, applications, characteristics and effects of the specific embodiments and other related contents of the present application, and cannot be considered as limitations of the present application.

[0025] In the drawings of the specification:

[0026] Figure 1 A structural schematic diagram of the electrolytic tank hydrofluoric acid preheating device according to the specific embodiments.

[0027] Figure 2 Another structural schematic diagram of the hydrofluoric acid preheating device of the electrolytic cell according to the specific embodiment;

[0028] Figure 3 A structural schematic diagram of the hydrofluoric acid electrolysis system according to the specific embodiment;

[0029] Figure 4 Another structural schematic diagram of the hydrofluoric acid electrolysis system according to the specific embodiment.

[0030] The reference signs involved in the above-mentioned drawings are explained as follows:

[0031] 110, acid feeding pipe,

[0032] 120, heating device,

[0033] 121, heat exchanger,

[0034] 122, heat exchange pipe,

[0035] 210, hydrofluoric acid tank,

[0036] 220, electrolytic cell. Specific Embodiment

[0037] To describe possible application scenarios, technical principles, specific schemes that can be implemented, purposes and effects that can be achieved, etc. of the present application in detail, the following will be described in detail in combination with specific embodiments listed and with the aid of drawings. The embodiments described in this paper are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0038] In this paper, the term “embodiment” means that the specific features, structures or characteristics described in combination with the embodiment can be included in at least one embodiment of the present application. The term “embodiment” appearing at various positions in the specification does not necessarily refer to the same embodiment, and does not particularly limit the independence or association between other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, each technical feature mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0039] Unless otherwise defined, the meanings of the technical terms used in this paper are the same as those commonly understood by the person skilled in the art to which the present application belongs; the use of related terms in this paper is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0040] In the description of the present application, the phrase "and / or" is a description of a logical relationship between objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " herein generally represents that the associated objects before and after are an "or" logical relationship.

[0041] In the present application, the terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual quantity, primary and secondary, or order relationship between the entities or operations.

[0042] In the present application, the phrases "include", "contain", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion, and these phrases do not exclude the presence of other elements in the process, method or product including the described elements, so that the process, method or product including a series of elements can not only include those limited elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0043] As the same understanding as in the "Guidelines for Examination", in the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, for example, "multiple groups", "multiple times" and the like, unless otherwise explicitly limited.

[0044] In the description of the embodiments of the present application, the spatially related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the specific embodiments or the drawings, and are only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and do not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0045] Unless otherwise defined, or limited by context, the terms used herein such as "install", "connect", "connection", "fix", "set", and the like, are to be construed to be broadest in scope and meant not to limit the items connected by such terms. For example, the "connection" can be fixed connection, or detachable connection, or integrated setting; it can be mechanical connection, or electrical connection, or communication connection; it can be direct connection, or indirect connection via an intermediate medium; it can be internal connection of two elements, or interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances by those skilled in the art.

[0046] Referring to Figure 1 and Figure 3 , the embodiment provides an electrolytic cell hydrofluoric acid preheating device, which is applied to a hydrofluoric acid electrolysis system, and the electrolytic cell hydrofluoric acid preheating device comprises:

[0047] an acid feeding pipe 110, one end of the acid feeding pipe 110 being connected to a hydrofluoric acid tank 210, and the other end of the acid feeding pipe 110 being connected to an electrolytic cell 220;

[0048] a heating device 120, which is arranged on the acid feeding pipe 110 and close to the one end of the hydrofluoric acid tank 210.

[0049] When it is needed to transport the hydrofluoric acid from the hydrofluoric acid tank 210 to the electrolytic cell 220 for electrolysis, the hydrofluoric acid is transported from the hydrofluoric acid tank 210 to the electrolytic cell 220 through the acid feeding pipe 110, and the heating device 120 is arranged on the acid feeding pipe 110 and close to the one end of the hydrofluoric acid tank 210, so that the liquid hydrofluoric acid in the heating pipe is heated by the heating device 120, the liquid hydrofluoric acid is heated into gaseous hydrofluoric acid, and thus the acid feeding pipe 110 will not produce condensed water due to low temperature during the transportation of the hydrofluoric acid, the risk of equipment damage is reduced, gaseous hydrofluoric acid is added to the electrolytic cell 220, and the electrolysis efficiency is improved.

[0050] Referring to Figure 2 , in some embodiments, the heating device 120 comprises:

[0051] a heat exchanger 121, which is arranged on the acid feeding pipe 110;

[0052] a heat exchange pipe 122, which is arranged in the heat exchanger 121.

[0053] The heating device 120 adopts a heat exchanger 121 and a heat exchange pipe 122. The heat exchanger 121 is arranged on the acid feeding pipe 110, and the heat exchange pipe 122 is arranged in the heat exchanger 121 to convey heat exchange fluid. The heat exchange fluid is heated and then sent into the heat exchange pipe 122 in the heat exchanger 121. Then, the heat exchanger 121 transmits the heat of the heat exchange fluid in the heat exchange pipe 122 to the acid feeding pipe 110 to heat the acid feeding pipe 110, so that the liquid hydrogen fluoride acid in the acid feeding pipe 110 is converted into gaseous hydrogen fluoride acid after being heated.

[0054] Please refer to Figure 4 In some embodiments, the water inlet of the heat exchange pipe 122 is connected to the water outlet of the temperature control device of the electrolytic tank 220, and the water outlet of the heat exchange pipe 122 is connected to the hot water tank.

[0055] The temperature control device is arranged in the electrolytic tank 220. The acid feeding pipe 110 is heated by the heat of the circulating water in the temperature control device. Specifically, the water inlet of the heat exchange pipe 122 is connected to the water outlet of the temperature control device of the electrolytic tank 220, and the water outlet of the heat exchange pipe 122 is connected to the hot water tank. When the circulating water is sent into the temperature control device of the electrolytic tank 220, the generated hot water is sent into the heat exchange pipe 122, and then the heat exchanger 121 heats the acid feeding pipe 110. In order to improve the heat exchange effect of the heat exchanger 121, the heat exchange pipe 122 is arranged in an S shape in the heat exchanger 121. The heat exchange pipe 122 is arranged in an S shape in the heat exchanger 121, which increases the heat exchange area between the heat exchange pipe 122 and the heat exchanger 121, and thus improves the heat exchange effect of the heat exchanger 121. In other embodiments, the fluid can be heated by a heater and then sent into the heating pipe after being heated by the heat exchanger 121, and then the acid feeding pipe 110 is heated.

[0056] In other embodiments, the heating device 120 can also adopt heating wires, which are wound around the acid feeding pipe 110. The acid feeding pipe 110 is heated by the heating wires after being electrified. Alternatively, the heating device 120 adopts heating sheets, which are attached to the acid feeding pipe 110. The acid feeding pipe 110 is heated by the heating sheets after being electrified.

[0057] In other embodiments, a temperature sensor and a controller are also adopted. The temperature sensor is arranged in the acid feeding pipe 110 to detect the temperature of the heated hydrogen fluoride acid in the acid feeding pipe 110. The controller controls the heating effect of the heating device according to the temperature sensor, so as to ensure that the heated hydrogen fluoride acid is in a gaseous state. When the heat exchange device adopts the heat exchanger 121 and the heat exchange pipe 122, the controller controls the heating effect of the heat exchanger 121 on the acid feeding pipe 110 by adjusting the flow rate of the heat exchange fluid passing through the heat exchange pipe 122.

[0058] Please refer to Figure 3 In another embodiment, a hydrogen fluoride electrolysis system includes:

[0059] an electrolytic cell 220, wherein the electrolytic cell 220 is used for electrolyzing the hydrofluoric acid;

[0060] a hydrofluoric acid large tank 210, wherein the hydrofluoric acid large tank 210 is used for storing the liquid hydrofluoric acid;

[0061] an acid feeding pipe 110, wherein one end of the acid feeding pipe 110 is connected to the hydrofluoric acid large tank 210, and the other end of the acid feeding pipe 110 is connected to the electrolytic cell 220;

[0062] a heating device 120, wherein the heating device 120 is arranged on the acid feeding pipe 110 close to the hydrofluoric acid large tank 210.

[0063] When it is needed to transport the hydrofluoric acid from the hydrofluoric acid large tank 210 to the electrolytic cell 220 for electrolysis, the hydrofluoric acid is transported from the hydrofluoric acid large tank 210 to the electrolytic cell 220 through the acid feeding pipe 110, and the heating device 120 is arranged on the acid feeding pipe 110 close to the hydrofluoric acid large tank 210, so that the liquid hydrofluoric acid in the acid feeding pipe 110 is heated by the heating device 120, and the liquid hydrofluoric acid is heated to be gaseous hydrofluoric acid, thereby preventing the acid feeding pipe 110 from producing condensed water due to low temperature during the transportation of the hydrofluoric acid, reducing the risk of equipment damage, and adding gaseous hydrofluoric acid to the electrolytic cell 220, improving the electrolysis efficiency.

[0064] Please refer to Figure 4 In some embodiments, the heating device 120 comprises:

[0065] a heat exchanger 121, wherein the heat exchanger 121 is arranged on the acid feeding pipe 110;

[0066] a heat exchange pipe 122, wherein the heat exchange pipe 122 is arranged in the heat exchanger 121.

[0067] In some embodiments, the heating device 120 comprises a heat exchanger 121 and a heat exchange pipe 122, the heat exchanger 121 is arranged on the acid feeding pipe 110, the heat exchange pipe 122 transports heat exchange fluid in the heat exchanger 121, the heat exchange fluid is heated and then sent into the heat exchange pipe 122 in the heat exchanger 121, and then the heat exchanger 121 transmits the heat of the heat exchange fluid in the heat exchange pipe 122 to the acid feeding pipe 110 to heat the acid feeding pipe 110, so that the liquid hydrofluoric acid in the acid feeding pipe 110 is converted to gaseous hydrofluoric acid after being heated.

[0068] Please refer to Figure 4 In some embodiments, the water inlet of the heat exchange pipe 122 is connected to the water outlet of the temperature control device of the electrolytic cell 220, and the water outlet of the heat exchange pipe 122 is connected to a hot water tank.

[0069] In the electrolytic tank 220 is equipped with temperature control device, through the use of circulating water heat control device in the heat of the acid pipe 110 is heated, specifically, the heat exchange pipe 122 inlet connected to the electrolytic tank 220 temperature control device outlet, heat exchange pipe 122 outlet connected to the hot water tank, when the circulating water into the electrolytic tank 220 temperature control, the resulting hot water into the heat exchange pipe 122, and then through the heat exchanger 121 on the acid pipe 110 heating. In order to heat exchanger 121 heat transfer effect, the heat exchange pipe 122 in heat exchanger 121 in S type arrangement. Heat exchange pipe 122 in heat exchanger 121 in S type arrangement, increase the heat exchange area between heat exchange pipe 122 and heat exchanger 121, and thus improve the heat transfer effect of heat exchanger 121. In other embodiments, also can be through the heater fluid heating after entering the heating pipe heat exchanger 121 heat exchanger 121 heating.

[0070] In other embodiments, heating device 120 can also use heating wire, heating wire winding on the acid pipe 110, through the heating wire after power on the acid pipe 110 heating, or heating device 120 using heating sheet, heating sheet after sticking on the acid pipe 110, and then power on the acid pipe 110 heating.

[0071] In other embodiments, also using temperature sensor and controller, temperature sensor is arranged in the acid pipe 110, detecting the temperature of the heated hydrofluoric acid in the acid pipe 110, the controller according to the temperature sensor to control the heating effect of the heating device, to ensure that the heated hydrofluoric acid is gaseous. Among them, when the heat exchange device uses heat exchanger 121 and heat exchange pipe 122, the controller controls the flow rate of the heat exchange fluid through the heat exchange pipe 122 to control the heating effect of the heat exchanger 121 on the acid pipe 110.

[0072] Finally, it needs to be explained that although in the specification of the present application and the drawings have been described above, but can not therefore limit the patent protection scope of the present application. For the essential idea based on the present application, using the content of the present application specification and drawing recorded in the equivalent structure or equivalent process substitution or modification of the resulting technical solutions, and directly or indirectly to the above technical solutions of the embodiment in other related technical fields, etc., are included in the patent protection scope of the present application.

Claims

1. A device for preheating hydrofluoric acid in an electrolytic cell, characterized in that, include: An acid-adding tube, one end of which is connected to a hydrofluoric acid tank and the other end of which is connected to an electrolytic cell; A heating device is installed on the acid addition pipe at one end near the hydrofluoric acid tank.

2. The electrolytic cell hydrofluoric acid preheating device according to claim 1, characterized in that, The heating device includes: A heat exchanger, wherein the heat exchanger is disposed on the acid supply pipe; Heat exchange tubes are disposed inside the heat exchanger.

3. The electrolytic cell preheating device for hydrofluoric acid according to claim 2, characterized in that, The inlet of the heat exchange tube is connected to the outlet of the temperature control device of the electrolytic cell, and the outlet of the heat exchange tube is connected to the hot water tank.

4. The electrolytic cell preheating device for hydrofluoric acid according to claim 2, characterized in that, The heat exchange tubes are arranged in an S-shape inside the heat exchanger.

5. A hydrofluoric acid electrolysis system, characterized in that, include: An electrolytic cell for electrolyzing hydrofluoric acid; A large hydrofluoric acid tank, used to store liquid hydrofluoric acid; An acid-adding tube, one end of which is connected to a hydrofluoric acid tank and the other end of which is connected to an electrolytic cell; A heating device is installed on the acid addition pipe at one end near the hydrofluoric acid tank.

6. The hydrofluoric acid electrolysis system according to claim 5, characterized in that, The heating device includes: A heat exchanger, wherein the heat exchanger is disposed on the acid supply pipe; Heat exchange tubes are disposed inside the heat exchanger.

7. The hydrofluoric acid electrolysis system according to claim 6, characterized in that, The inlet of the heat exchange tube is connected to the outlet of the temperature control device of the electrolytic cell, and the outlet of the heat exchange tube is connected to the hot water tank.

8. The hydrofluoric acid electrolysis system according to claim 6, characterized in that, The heat exchange tubes are arranged in an S-shape inside the heat exchanger.

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