Temperature-resistant and acid-resistant heat exchanger and production process thereof

Abstract

The application relates to a temperature-resistant and acid-resistant heat exchanger and a generating process, which comprises the following steps: a heat exchange pipe group is composed of a plurality of corrosion-resistant heat exchange pipes; the heat exchange pipes are immersed in corrosive chemical liquid and are used for circulating heat exchange of heat exchange medium; a support is used for supporting and fixing the heat exchange pipe group; a collecting component is used for collecting the pipe openings of the plurality of corrosion-resistant heat exchange pipes to form a multi-in and multi-out parallel circulating flow path; a cold water circulating inlet and a cold water circulating outlet are connected with the collecting component respectively and are used for connecting external cold water circulation. The application adopts the corrosion-resistant heat exchange pipes, and all joints are arranged outside the corrosive chemical liquid, so that the corrosion leakage risk is fundamentally eliminated, and long-term stable operation and maintenance-free use are realized.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and in particular to a heat exchanger and its manufacturing process that is resistant to temperature and acid. Background Technology

[0002] In production processes involving highly corrosive chemical solutions, such as chemical, electronic, and materials processing, temperature control is often required to maintain the stability of the chemical properties. For example, in processes such as electrochemical polishing, chemical etching, and MOCVD (Metal-Organic Chemical Vapor Deposition), the operating temperature of highly corrosive chemical solutions such as phosphoric acid, sulfuric acid, hydrochloric acid, and nitric acid needs to be precisely controlled to ensure process effectiveness and product quality.

[0003] To achieve temperature control of corrosive chemical solutions, immersion heat exchangers are typically used. These exchanger pipes are submerged in the chemical solution, and heat exchange occurs between the heat exchanger and the chemical solution using a circulating heat exchange medium. However, existing immersion heat exchangers suffer from the following technical problems: First, insufficient corrosion resistance leads to a short service life. Current technologies primarily use metallic materials such as stainless steel and titanium alloys for heat exchanger piping. While stainless steel pipes are relatively inexpensive, they are easily corroded in strong acid environments; titanium alloy pipes have better corrosion resistance, but are expensive. To improve the corrosion resistance of stainless steel pipes, a Teflon anti-corrosion coating is often used. However, the coating is prone to defects such as bubbles and uneven thickness during manufacturing, allowing acid to still penetrate and corrode the metal substrate, leading to pipe perforation. Heat exchangers made of these metallic materials typically experience corrosion and perforation every 6-12 months, resulting in a short service life and frequent maintenance.

[0004] Secondly, leaks at metal welded joints can have serious consequences. To improve heat exchange efficiency, existing technologies often employ a structure of multiple metal tubes welded in parallel, enhancing heat exchange by increasing the heat exchange area and the number of pipes. However, the large number of welded joints in the metal tubes makes it difficult to guarantee weld quality. Under the combined effects of water pressure and acid corrosion, perforation leaks are highly likely to form at the joints. The consequences of such leaks are severe: on the one hand, the heat exchange medium, usually water, enters the chemical solution through the perforations, leading to increased water content, decreased functionality, and even render the chemical solution unusable, requiring specialized dehydration processes for restoration, wasting time and money; on the other hand, after shutdown, the chemical solution is drawn back into the heat exchange medium circulation system through the perforations, corroding and damaging chillers and other supporting equipment, resulting in high repair costs and severely impacting normal production.

[0005] Third, maintenance and operation are inconvenient. Metal heat exchangers are heavy, and they need to be frequently removed from the chemical solution to check for corrosion, which is laborious; moreover, micro-leaks are not easily detected in the early stages, and often have serious consequences by the time they are discovered.

[0006] Therefore, there is an urgent need for a heat exchanger with excellent corrosion resistance, no risk of leakage at joints, long service life, and easy maintenance to solve the above-mentioned problems in the existing technology. Summary of the Invention

[0007] Therefore, the technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a temperature- and acid-resistant heat exchanger and its manufacturing process. By using corrosion-resistant heat exchange tubes and placing all joints outside the corrosive chemical liquid, the risk of corrosion leakage is fundamentally eliminated, achieving long-term stable operation and maintenance-free use.

[0008] In a first aspect, to solve the above-mentioned technical problems, the present invention provides a temperature- and acid-resistant heat exchanger, comprising: The heat exchange tube assembly consists of multiple corrosion-resistant heat exchange tubes, which are immersed in a corrosive chemical solution for circulating heat exchange of the heat exchange medium. A bracket is used to support and fix the heat exchange tube assembly; A collection component is used to collect the inlets of the multiple corrosion-resistant heat exchange tubes to form a parallel circulation path with multiple inlets and outlets. The cold water circulation inlet and cold water circulation outlet are respectively connected to the collecting component for connecting to the external cold water circulation.

[0009] In one embodiment of the present invention, the corrosion-resistant heat exchange tube is a PTFE tube, which is bent into a U-shaped structure.

[0010] In one embodiment of the present invention, the corrosion-resistant heat exchange tube is a transparent tube used for observing the water flow.

[0011] In one embodiment of the present invention, the bracket is made of PP material.

[0012] In one embodiment of the present invention, the support includes a plurality of support frames spaced apart along the length of the heat exchange tube assembly, and the support frames are provided with positioning holes for the corrosion-resistant heat exchange tubes to pass through.

[0013] In one embodiment of the present invention, the support frame is a rectangular frame structure, and the corrosion-resistant heat exchange tubes are arranged and passed through the support frame.

[0014] In one embodiment of the present invention, the support frame is fabricated from PP sheet and assembled by plastic welding.

[0015] In one embodiment of the present invention, the gathering component is a brancher.

[0016] In one embodiment of the present invention, the cold water circulation inlet and the cold water circulation outlet are arranged vertically upward, and the collecting component is arranged horizontally above the liquid level of the corrosive chemical liquid.

[0017] Secondly, in order to solve the above-mentioned technical problems, the present invention provides a manufacturing process for a temperature- and acid-resistant heat exchanger as described in the first aspect, comprising the following steps: S1: Measure the volume, dimensions, shape, and structure of the acid storage tank, and determine the structural shape and installation location of the exchanger based on its structural characteristics; S2: Draw the bracket drawings and 3D assembly diagrams based on the measured dimensions and design requirements; S3: Process PP sheets according to the component drawings and assemble them into the support frame of the exchanger by plastic welding; S4: Cut the PTFE tube to the required length and bend it into a U-shape, then assemble the tube on the support. S5: Use a brancher to combine the pipe ends of multiple PTFE pipes to form a circulating water circuit; S6: Connect the heat exchanger to the chiller for circulation testing and check the flow rate of each pipe; S7: Install a bracket fixing block inside the acid storage tank to fix the exchanger inside the storage tank, and fix the branch device in a suitable position outside the storage tank, and reconnect it to the chiller water circulation. S8: Acid solution temperature control test to verify heat exchange performance.

[0018] Compared with the prior art, the above-described technical solution of the present invention has the following advantages: The present invention discloses a temperature- and acid-resistant heat exchanger that solves the problem of easy corrosion and perforation of metal materials by acid in the prior art by using corrosion-resistant materials as heat exchange tubes. By placing the collection components outside the corrosive chemical liquid and ensuring that the heat exchange tube assembly has no joints in the immersion area, the risk of leakage caused by poor sealing or welding quality at the joints is completely eliminated. This fundamentally avoids the problems of chemical liquid contamination caused by heat exchange medium leakage and equipment damage caused by chemical liquid entering the heat exchange medium circulation, achieving a long-term maintenance-free technical effect. Attached Figure Description

[0019] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein: Figure 1 This is a schematic diagram of the temperature- and acid-resistant heat exchanger structure in this invention; Explanation of the reference numerals in the instruction manual: 1. Heat exchange tube assembly; 11. Corrosion-resistant heat exchange tube; 2. Support; 3. Collection component; 4. Cold water circulation inlet; 5. Cold water circulation outlet. Detailed Implementation

[0020] Example 1

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0022] Reference Figure 1 As shown, a temperature- and acid-resistant heat exchanger of the present invention includes: The heat exchange tube assembly 1 consists of multiple corrosion-resistant heat exchange tubes 11, which are immersed in a corrosive chemical liquid for circulating heat exchange of the heat exchange medium. Support 2 is used to support and fix the heat exchange tube assembly 1; A collecting component 3, disposed outside the corrosive chemical liquid, is used to collect the inlets of the multiple corrosion-resistant heat exchange tubes 11 to form a circulating flow path, wherein the heat exchange tube assembly 1 is immersed in the corrosive chemical liquid; The cold water circulation inlet 4 and the cold water circulation outlet 5 are respectively connected to the collecting component 3 for connecting to the external cold water circulation.

[0023] Based on the above-mentioned structure, the temperature and acid resistant heat exchanger has no joints in the area where the corrosion-resistant heat exchange tube 11 is completely immersed in the polishing liquid. All tube openings are collected outside the acid liquid through the collecting component 3, which completely eliminates the risk of corrosion leakage and can achieve a near maintenance-free state.

[0024] In this embodiment, both the corrosion-resistant heat exchange tube 11 and the support 2 are made of PTFE. PTFE material has excellent temperature and chemical corrosion resistance, enabling long-term stable use in highly corrosive environments. PTFE material also has good acid and alkali corrosion resistance and mechanical strength, and is inexpensive. The combination of these two materials enables the heat exchanger to operate reliably in corrosive chemical solutions for extended periods.

[0025] The support frame 2 is made of PP sheet material and assembled by plastic welding. The support frame 2 includes a base plate, side plates, and a pipe positioning plate. The sheet materials are assembled into a support frame by plastic welding to support and fix the corrosion-resistant heat exchange tube 11. Assembling the PP sheet material by plastic welding is a simple and cost-effective process, and the support frame 2 has a stable structure, enabling long-term stable use in corrosive environments.

[0026] In this embodiment, the heat exchange tube assembly 1 consists of 10 corrosion-resistant heat exchange tubes 11 made of PTFE material with a diameter of 6mm. These tubes 11 are bent into a U-shape. By using 10 6mm diameter corrosion-resistant heat exchange tubes 11 connected in parallel and bent into a U-shape, the total unfolded length is 3m. This ensures sufficient heat exchange area while improving the pressure resistance of the pipeline. Furthermore, the U-shape extends the heat exchange path, improving heat exchange efficiency. The compact structure also facilitates arrangement in limited spaces. The PTFE corrosion-resistant heat exchange tubes 11 possess excellent temperature resistance (-260℃~260℃) and chemical corrosion resistance; their weight and performance remain unchanged even after being boiled in concentrated sulfuric acid, nitric acid, hydrochloric acid, or water.

[0027] Preferably, the collecting component 3 is a brancher, and two branchers combine the 20 ports of 10 PTFE pipes into a 5-in-5-out cold water circulation system. Two 1-to-5 PP material branchers are installed outside the acid storage tank. Each brancher has one main port and five branch ports, and each branch port connects to the ports of two corrosion-resistant heat exchange tubes 11 (one inlet and one outlet), thus combining the 20 ports of the 10 corrosion-resistant heat exchange tubes 11 into a 5-in-5-out cold water circulation system. By combining the 10 pipes 11 into a 5-in-5-out circulation system through the two branchers, uniform water flow distribution is achieved, ensuring balanced flow in each PTFE pipe, improving overall heat exchange efficiency, and simplifying external pipe connections for easier connection to a chiller.

[0028] In this embodiment, the cold water circulation inlet 4 and cold water circulation outlet 5 are vertically upward, and the collecting component 3 is horizontally positioned above the corrosive chemical liquid. The vertical upward orientation of the cold water circulation inlet 4 and outlet 5 facilitates pipe connection and layout, and also reduces the risk of chemical liquid backflow. The collecting component 3 is positioned outside the corrosive chemical liquid, preventing direct contact with the underlying corrosive liquid and reducing corrosion.

[0029] In this embodiment, the support 2 is made of PP sheet with a thickness of 10mm. Using PP sheet with a thickness of 10mm to make the support 2 ensures sufficient mechanical strength and rigidity while controlling material costs, enabling the support 2 to reliably support the heat exchange tube assembly 1 and maintain structural stability during long-term operation.

[0030] Preferably, the corrosion-resistant heat exchange tube 11 is a transparent tube for observing the water flow. Using a transparent corrosion-resistant heat exchange tube 11 eliminates the need to remove the heat exchanger from the chemical solution; the water flow in each tube 11 can be directly observed simply by auxiliary irradiation, facilitating daily inspection and maintenance, and further achieving maintenance-free operation.

[0031] Example 2 This invention discloses a manufacturing process for a temperature- and acid-resistant heat exchanger as described in Example 1, comprising the following steps: S1: Measure the volume, dimensions, shape, and structure of the acid storage tank, and determine the structural shape and installation location of the exchanger based on its structural characteristics; S2: Based on the measured dimensions and design requirements, draw the drawings of bracket 2 and the three-dimensional assembly diagram; S3: Process the PP sheet according to the component drawings, and assemble it into the support frame 2 of the exchanger by plastic welding; S4: Cut the PTFE tube to the required length and bend it into a U-shape, then assemble it on the bracket 2; S5: Use a brancher to combine the pipe ends of multiple PTFE pipes to form a circulating water circuit; S6: Connect the heat exchanger to the chiller for circulation testing and check the flow rate of each pipe; S7: Install a bracket fixing block inside the acid storage tank to fix the exchanger inside the storage tank, and fix the branch device in a suitable position outside the storage tank, and reconnect it to the chiller water circulation. S8: Acid solution temperature control test to verify heat exchange performance.

[0032] The production process is simple, requiring no complex welding process, and has low manufacturing cost; by assembling the bracket 2 first and then inserting the tubes, the shape accuracy and installation convenience of the heat exchange tube assembly 1 are ensured; and by installing the collection component 3 outside the storage tank, the sealing reliability of the area immersed in the chemical liquid is ensured.

[0033] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A temperature- and acid-resistant heat exchanger, characterized in that, include: The heat exchange tube assembly consists of multiple corrosion-resistant heat exchange tubes, which are immersed in a corrosive chemical solution for circulating heat exchange of the heat exchange medium. A bracket is used to support and fix the heat exchange tube assembly; A collection component is used to collect the inlets of the multiple corrosion-resistant heat exchange tubes to form a parallel circulation path with multiple inlets and outlets. The cold water circulation inlet and cold water circulation outlet are respectively connected to the collecting component for connecting to the external cold water circulation.

2. The temperature- and acid-resistant heat exchanger according to claim 1, characterized in that, The corrosion-resistant heat exchange tube is a PTFE tube, which is bent into a U-shaped structure.

3. The temperature- and acid-resistant heat exchanger according to claim 1, characterized in that, The corrosion-resistant heat exchange tube is a transparent tube used to observe the water flow.

4. The temperature- and acid-resistant heat exchanger according to claim 1, characterized in that, The bracket is made of PP material.

5. The temperature- and acid-resistant heat exchanger according to claim 1, characterized in that, The support includes multiple support frames spaced apart along the length of the heat exchange tube assembly, and the support frames are provided with positioning holes for the corrosion-resistant heat exchange tubes to pass through.

6. The temperature- and acid-resistant heat exchanger according to claim 5, characterized in that, The support frame is a rectangular frame structure, and the corrosion-resistant heat exchange tubes are arranged and passed through the support frame.

7. The temperature- and acid-resistant heat exchanger according to claim 6, characterized in that, The support frame is made of PP sheet material and assembled by plastic welding.

8. The temperature- and acid-resistant heat exchanger according to claim 1, characterized in that, The converging component is a brancher.

9. The temperature- and acid-resistant heat exchanger according to claim 1, characterized in that, The cold water circulation inlet and outlet are vertically upward, and the collecting component 3 is horizontally positioned above the level of the corrosive chemical liquid.

10. A manufacturing process for a temperature- and acid-resistant heat exchanger as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Measure the volume, dimensions, shape, and structure of the acid storage tank, and determine the structural shape and installation location of the exchanger based on its structural characteristics; S2: Draw the bracket drawings and 3D assembly diagrams based on the measured dimensions and design requirements; S3: Process PP sheets according to the component drawings and assemble them into the support frame of the exchanger by plastic welding; S4: Cut the PTFE tube to the required length and bend it into a U-shape, then assemble the tube on the support. S5: Use a brancher to combine the pipe ends of multiple PTFE pipes to form a circulating water circuit; S6: Connect the heat exchanger to the chiller for circulation testing and check the flow rate of each pipe; S7: Install a bracket fixing block inside the acid storage tank to fix the exchanger inside the storage tank, and fix the branch device in a suitable position outside the storage tank, and reconnect it to the chiller water circulation. S8: Acid solution temperature control test to verify heat exchange performance.

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