A dilution heat exchanger for low to medium concentration hydrofluoric acid

Abstract

The utility model discloses a kind of middle-low concentration hydrofluoric acid dilution heat exchanger, it is related to heat exchange technical field.A kind of middle-low concentration hydrofluoric acid dilution heat exchanger, including shell, front head and rear head, front head and rear head are fixed with shell both ends by sealing assembly connection respectively, the inside fixed mounting of shell has tube sheet, SiC heat exchange tube is fixedly installed on tube sheet, one end of SiC heat exchange tube penetrates tube sheet, the both ends of SiC heat exchange tube are respectively connected with the interface in the front head and rear head, by the baffling component and the turbulence component of being set, HF and dilution water are mixed in heat exchanger interior, set corresponding inner piece strengthens the mixing effect of HF and dilution water, since the internal flow area of heat exchanger is big, trace HF gasification can not cause the obvious fluctuation of HF and dilution water pipeline flow, feed acid and dilution water are respectively using flow controller to control flow, can realize the continuous production of HF and dilution water without using absorption tower.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a medium- and low-concentration hydrofluoric acid dilution heat exchanger. Background Technology

[0002] Hydrofluoric acid is an aqueous solution of hydrogen fluoride gas. It is a clear, colorless, corrosive liquid with a strong, pungent odor. It is a weak acid, but it is extremely corrosive and can corrode metals, glass, and silicon-containing materials such as quartz. Due to its strong corrosiveness, hydrofluoric acid is particularly destructive to glass.

[0003] Hydrofluoric acid is an important industrial raw material, usually prepared by mixing anhydrous hydrogen fluoride and water / dilute acid. Due to the high heat of dilution and extremely low vaporization temperature of hydrogen fluoride, anhydrous hydrogen fluoride is easily vaporized during mixing, causing fluctuations in system flow, which leads to difficulties in control and large product fluctuations. Currently, intermittent preparation is mostly used, resulting in low production efficiency. Continuous operation requires an absorption tower structure, which occupies a large area. The preparation cost of medium and low concentration hydrofluoric acid is high, resulting in poor economic efficiency. Therefore, we propose a medium and low concentration hydrofluoric acid dilution heat exchanger. Utility Model Content

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a medium- and low-concentration hydrofluoric acid dilution heat exchanger. This addresses the issue that hydrofluoric acid is an important industrial raw material, usually prepared by anhydrous hydrogen fluoride and water / dilute acid. Due to the high heat of dilution and extremely low vaporization temperature of hydrogen fluoride, anhydrous hydrogen fluoride is easily vaporized during mixing, causing system flow fluctuations, leading to control difficulties and large product fluctuations. Currently, intermittent configuration is mostly used, resulting in low production efficiency. Continuous operation requires an absorption tower structure, which occupies a large area. The preparation cost of medium- and low-concentration hydrofluoric acid is high, resulting in poor economic efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a medium-to-low concentration hydrofluoric acid dilution heat exchanger, comprising: The shell, front end cap, and rear end cap are respectively connected and fixed to both ends of the shell through sealing components, and the tube sheet is located between the front end cap, rear end cap, and shell; A tube sheet is fixedly installed inside the shell, and SiC heat exchange tubes are fixedly installed on the tube sheet. One end of the SiC heat exchange tube penetrates through the tube sheet, and the two ends of the SiC heat exchange tube are respectively connected to the interfaces inside the front end cap and the rear end cap. Baffle components and turbulence components are respectively provided inside the shell, and both the baffle components and turbulence components are located outside the SiC heat exchange tubes.

[0006] Preferably, a cooling water inlet and a cooling water outlet are fixedly connected to the outer surface of the housing, and both the cooling water inlet and the cooling water outlet are in communication with the interior of the housing.

[0007] Preferably, the front end cap is provided with a dilution water inlet, an HF inlet, a first drain outlet, an insertion tube, and an insertion tube fixing port, and the outer surface of the insertion tube is provided with multiple HF outlets.

[0008] Preferably, the rear end cap is provided with a finished acid outlet and a second clean outlet.

[0009] Preferably, one end of the insertion tube is located inside the insertion tube fixing port, and the other end of the insertion tube is located inside the HF inlet. The dilution water inlet, HF inlet, first drain outlet, and insertion tube fixing port are all fixedly connected to the outer surface of the front end cap.

[0010] Preferably, the finished acid outlet and the second clean outlet are both fixedly connected to the outer surface of the rear end cap.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. This medium-low concentration hydrofluoric acid dilution heat exchanger mixes HF and dilution water inside the heat exchanger through baffle and turbulence components. Corresponding internal components are set to enhance the mixing effect of HF and dilution water. Due to the large flow area inside the heat exchanger, the vaporization of trace amounts of HF will not cause significant fluctuations in the flow rates of HF and dilution water pipelines. The flow rates of feed acid and dilution water are controlled by flow controllers, which can achieve continuous production of HF and dilution water without the use of an absorption tower. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the first row of clear opening structure of this utility model; Figure 3 This is a schematic diagram of the dilution water inlet structure of this utility model; Figure 4 This is a schematic diagram of the cross-sectional structure of the front end cap of this utility model; Figure 5 This is a schematic diagram of the cooling water outlet structure of this utility model; Figure 6 This is a schematic diagram of the HF outlet structure of this utility model.

[0013] Reference numerals: 1. Shell; 2. Baffle assembly; 3. SiC heat exchange tube; 4. Cooling water outlet; 5. Dilution water inlet; 6. Insert tube fixing port; 7. Front end cap; 8. First drain outlet; 9. Tube sheet; 10. Baffle assembly; 11. Cooling water inlet; 12. Second drain outlet; 13. Rear end cap; 14. Finished acid outlet; 15. Sealing assembly; 16. HF inlet; 17. HF outlet; 18. Insert tube. Detailed Implementation

[0014] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0015] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0016] In the description of this utility model, terms such as greater than, less than, and exceeding are understood to exclude the stated number, while terms such as above, below, and within are understood to include the stated number. The use of terms like "first" and "second" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the quantity or sequence of the indicated technical features.

[0017] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0018] Please see Figures 1-6 This utility model provides a technical solution: a medium-to-low concentration hydrofluoric acid dilution heat exchanger, comprising: The shell 1, the front end 7 and the rear end 13 are respectively connected and fixed to both ends of the shell 1 by sealing components 15, and the tube sheet 9 is located between the front end 7, the rear end 13 and the shell 1; A tube sheet 9 is fixedly installed inside the shell 1. A SiC heat exchange tube 3 is fixedly installed on the tube sheet 9. One end of the SiC heat exchange tube 3 passes through the tube sheet 9. The two ends of the SiC heat exchange tube 3 are respectively connected to the interfaces inside the front end cap 7 and the rear end cap 13. A flow baffle assembly 2 and a flow turbulence assembly 10 are respectively provided inside the shell 1. Both the flow baffle assembly 2 and the flow turbulence assembly 10 are located outside the SiC heat exchange tube 3.

[0019] Cooling water inlet 11 and cooling water outlet 4 are fixedly connected to the outer surface of the housing 1, and both cooling water inlet 11 and cooling water outlet 4 are connected to the interior of the housing 1.

[0020] The front end cap 7 is provided with a dilution water inlet 5, an HF inlet 16, a first drain outlet 8, an insertion tube 18, and an insertion tube fixing port 6. Multiple HF outlets 17 are opened on the outer surface of the insertion tube 18. One end of the insertion tube 18 is located inside the insertion tube fixing port 6, and the other end of the insertion tube 18 is located inside the HF inlet 16. The dilution water inlet 5, the HF inlet 16, the first drain outlet 8, and the insertion tube fixing port 6 are all fixedly connected to the outer surface of the front end cap 7.

[0021] The rear end cap 13 is provided with a finished acid outlet 14 and a second clean outlet 12, both of which are fixedly connected to the outer surface of the rear end cap 13.

[0022] Furthermore, when using the device, anhydrous hydrogen fluoride (HF) enters the insertion tube 18 from the HF inlet 16. Multiple HF outlets 17 on the insertion tube 18 introduce HF into the interior of the shell 1. Diluent water enters the shell 1 from the diluent water inlet 5 and meets HF in the space around the SiC heat exchange tube 3. The baffle assembly 2 and the turbulence assembly 10 installed inside the shell 1 promote thorough mixing of HF and diluent water. Because the dilution heat of hydrofluoric acid is insufficient to cause the finished acid to boil at low and medium concentrations, the mixing process is relatively stable. During mixing, heat exchange occurs through the SiC heat exchange tube 3, carrying away the heat generated during the dilution process. Cooling water enters from the cooling water inlet 11 and flows between the shell 1 and the SiC heat exchange tube 3. After absorbing heat, it flows out from the cooling water outlet 4. The finished acid, after mixing and heat exchange, flows out from the finished acid outlet 14. Throughout the process, the flow rates of the feed acid and diluent water are controlled by flow controllers to ensure continuous and stable production. The first drain outlet 8 and the second drain outlet 12 can discharge residual liquid inside the shell 1 when needed.

[0023] By using the baffle assembly 2 and the turbulence assembly 10, HF and dilution water are mixed inside the heat exchanger. The corresponding internal components are set to enhance the mixing effect of HF and dilution water. Due to the large flow area inside the heat exchanger, the vaporization of a small amount of HF will not cause significant fluctuations in the flow rate of HF and dilution water pipelines. The flow rates of feed acid and dilution water are controlled by flow controllers, which can achieve continuous production of HF and dilution water without the use of an absorption tower.

[0024] Structural Description: Shell 1: Serves as the main body of the device, providing installation space for internal components and accommodating the mixing and heat exchange processes of HF and dilution water; Baffle assembly 2: Located outside the SiC heat exchange tube 3, it changes the fluid flow direction, increases fluid turbulence, and enhances the mixing effect of HF and dilution water; SiC heat exchange tube 3: Used for heat exchange, removing the dilution heat generated when HF and dilution water are mixed, and maintaining the system temperature stability; Cooling water outlet 4: Discharges the cooling water after it has absorbed heat; Dilution water inlet 5: Introduces dilution water to provide a water source for the dilution of hydrofluoric acid; Insertion tube fixing port 6: Fix the insertion tube 18 to ensure its accurate installation position; Front end cap 7: Closes one end of the housing 1, providing an installation position for components such as dilution water inlet 5 and HF inlet 16; First drain outlet 8: drains residual liquid inside casing 1, facilitating cleaning and maintenance of the device; Tube sheet 9: Fixes the SiC heat exchange tubes 3 to ensure their installation position and stability; Flow disturbance component 10: Located outside the SiC heat exchange tube 3, it disrupts fluid flow and enhances the mixing degree of HF and dilution water; Cooling water inlet 11: Introduces cooling water to remove heat generated during the mixing process; Second drain outlet 12: drains residual liquid inside housing 1, facilitating cleaning and maintenance of the device; Rear end cap 13: Seals the other end of the housing 1, providing an installation location for components such as the finished acid outlet 14; Finished acid outlet 14: Discharges the mixed and heat-exchanged finished acid; Sealing assembly 15: Ensures the sealing of the connection between the front end cap 7, the rear end cap 13 and the housing 1, and prevents fluid leakage; HF Inlet 16: This is the channel for introducing anhydrous hydrogen fluoride (HF) into the device. HF outlet 17: It is opened on the insertion tube 18 so that HF ​​flows out from the insertion tube 18 and enters the interior of the housing 1; Insertion tube 18: guides HF into the interior of housing 1 and distributes HF reasonably through HF outlet 17.

[0025] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A medium-to-low concentration hydrofluoric acid dilution heat exchanger, characterized in that, include: The shell (1), the front end cap (7) and the rear end cap (13) are respectively connected and fixed to both ends of the shell (1) through sealing components (15); A tube sheet (9) is fixedly installed inside the shell (1), and a SiC heat exchange tube (3) is fixedly installed on the tube sheet (9). One end of the SiC heat exchange tube (3) passes through the tube sheet (9), and the two ends of the SiC heat exchange tube (3) are respectively connected to the interfaces inside the front end cap (7) and the rear end cap (13). The shell (1) is equipped with a flow baffle assembly (2) and a flow disturbance assembly (10), both of which are located outside the SiC heat exchange tube (3).

2. The medium-to-low concentration hydrofluoric acid dilution heat exchanger according to claim 1, characterized in that: Cooling water inlet (11) and cooling water outlet (4) are fixedly connected to the outer surface of the shell (1), and both cooling water inlet (11) and cooling water outlet (4) are connected to the interior of the shell (1).

3. The medium-to-low concentration hydrofluoric acid dilution heat exchanger according to claim 1, characterized in that: The front end cap (7) is provided with a dilution water inlet (5), an HF inlet (16), a first drain outlet (8), an insertion tube (18), and an insertion tube fixing port (6). Multiple HF outlets (17) are opened on the outer surface of the insertion tube (18).

4. A medium-to-low concentration hydrofluoric acid dilution heat exchanger according to claim 1, characterized in that: The rear end cap (13) is provided with a finished acid outlet (14) and a second clean outlet (12).

5. A medium-to-low concentration hydrofluoric acid dilution heat exchanger according to claim 3, characterized in that: One end of the insertion tube (18) is located inside the insertion tube fixing port (6), and the other end of the insertion tube (18) is located inside the HF inlet (16). The dilution water inlet (5), HF inlet (16), first drain outlet (8) and insertion tube fixing port (6) are all fixedly connected to the outer surface of the front end cap (7).

6. A medium-to-low concentration hydrofluoric acid dilution heat exchanger according to claim 4, characterized in that: The finished acid outlet (14) and the second clean outlet (12) are both fixedly connected to the outer surface of the rear end cap (13).

Images