A circular tube titanium heat exchanger with uniform heat exchange in horizontal direction

Abstract

The present invention relates to the field of heat exchange equipment, and specifically belongs to a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction. It includes a circular tube-type heat exchanger shell, an end plug-in plate, a plug-in plate mounting through hole, a cylindrical liquid inlet, an inlet mounting through hole, a baffle plate, and a heat exchange tube. The heat exchange tube passes through more than one baffle plate and is vertically plugged into the end plug-in plates at both ends of the heat exchanger shell. The heat exchange tube is sealed and connected to the end plug-in plate. The heat exchange tubes are arranged from the center of the plane where the plug-in plate is located to the circumference in a regular hexagonal position relationship. It can reduce the deposition and scale of materials between the surface of the heat exchange tube and the inner wall of the heat exchanger, reduce the chemical reaction between the material and the heat exchange tube, and enable the heat exchange tubes in the same row to exchange heat with the material uniformly. The heat exchange tubes in the same row have basically the same surface flow rate, so they have a similar service life, which improves the overall service life and economy of the titanium heat exchanger.

Description

Technical Field

[0001] The invention relates to the field of heat exchange equipment, and in particular belongs to a circular tube titanium heat exchanger for uniform heat exchange in a horizontal direction. Background Art

[0002] Titanium heat exchanger is a heat exchange device made of high-quality titanium tubes that transfers part of the heat of hot fluid to cold fluid. Titanium heat exchanger, with the many advantages of industrial pure titanium, is a general equipment in chemical, petroleum, power, food and many other industrial sectors, and occupies an important position in production. Titanium heat exchanger, with the various excellent properties of industrial pure titanium, is widely used in various seafood farming, seawater heat exchange, brine heat exchange, chemical, food, medicine, metallurgy, refrigeration, light industry, electroplating industry, aluminum oxidation tank, salt making, papermaking, ultrasound, electronic communications, central heating and other industries and fields.

[0003] Titanium heat exchangers are made of high-quality titanium tubes. In terms of physical properties, titanium tubes have many advantages such as light weight and excellent mechanical properties. Titanium has high strength, and the tensile strength of pure titanium can reach up to 180kg / mm2. Some steels are stronger than titanium alloys, but the specific strength (ratio of tensile strength to density) of titanium alloys exceeds that of high-quality steel. In addition, titanium alloys have good heat resistance, low-temperature toughness and fracture toughness. In terms of chemical properties, titanium shows good stability and has good corrosion resistance in a variety of industrial solutions. Industrial pure titanium is an excellent material for refrigeration equipment accessories. Industrial pure titanium can be widely used in media such as organic compounds, alkaline solutions, and salt solutions, and is not easy to react with them, and has excellent corrosion resistance; pure titanium has good corrosion resistance to low concentrations of hydrochloric acid, sulfuric acid, nitric acid and other inorganic acids at room temperature; but with the increase of medium concentration and working temperature, industrial pure titanium is easy to react chemically with the above-mentioned inorganic acids, which reduces the corrosion resistance of titanium. Therefore, attention should be paid to the concentration of the medium and the working temperature during the heat exchange process; industrial pure titanium has good corrosion resistance to organic acids such as formic acid, oxalic acid, lactic acid and other organic acids at room temperature.

[0004] In actual use, the heat transfer effect of the heat exchanger is closely related to the material and process characteristics of the heat exchanger. During the concentration process of the material, solutes or impurities often deposit and crystallize on the heating surface to form a scale layer, which affects heat transfer; some solutes are heat-sensitive and are prone to deterioration if they stay at high temperatures for too long; some materials are highly corrosive or have high viscosity.

[0005] In addition, in traditional round tube titanium heat exchangers, the heat exchange tubes are arranged in multiple rows horizontally, and in order to reduce the complexity of processing, the heat exchange tubes are arranged equidistantly from each other, and the inlet and outlet of the coolant are mostly located at the highest and lowest points of the vertical central axis to ensure that the liquid to be exchanged has a higher potential energy when it flows into the heat exchanger, and can flow out of the heat exchanger to the greatest extent. However, the relative position of the inlet and outlet and the heat exchange tubes leads to inconsistent cooling efficiency of the heat exchange tubes. The heat exchange tubes near the longitudinal central axis often bear more heat dissipation load than the heat exchange tubes near the edge, which makes the heat exchange process very uneven and the heat exchange efficiency insufficient. In addition, the heat exchange tubes near the middle often have a faster loss rate and a more serious erosion rate, which shortens the maintenance and replacement cycle of the heat exchanger and reduces the economic benefits of the heat exchanger. Summary of the invention

[0006] At least one objective of the present invention is to propose a circular tube titanium heat exchanger with uniform heat exchange in the horizontal direction. On the basis of solving the above-mentioned technical problems, it can reduce the deposition and scaling of materials between the surface of the heat exchange tube and the inner wall of the heat exchanger, reduce the chemical reaction between the materials and the heat exchange tubes, and enable the heat exchange between the heat exchange tubes in the same row to exchange heat with the materials uniformly. The heat exchange tubes in the same row have basically the same surface flow rate, and thus have similar service life, thereby improving the overall service life and economy of the titanium heat exchanger.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides a circular tubular titanium heat exchanger with uniform heat exchange in the horizontal direction, comprising a circular tubular heat exchanger shell, wherein both ends of the heat exchanger shell are respectively provided with end plug-in disks, and the outer circumference of the end plug-in disks has more than one plug-in disk mounting through holes, and one end of the heat exchanger shell is located at the vertex of the vertical central axis and has a cylindrical liquid inlet, and the end of the liquid inlet away from the heat exchanger shell has a horizontal annular inlet mounting edge, and the annular inlet mounting edge has more than one inlet mounting through holes, and the other end of the heat exchanger shell is located at the bottom point of the vertical central axis and has a cylindrical liquid outlet, and the end of the liquid outlet away from the heat exchanger shell has a horizontal annular outflow mounting edge, The annular outflow mounting edge is provided with more than one outflow mounting through hole, the interior of the heat exchanger shell is provided with more than one vertical baffle plates, the baffle plates are connected to the top or bottom of the heat exchanger shell at intervals, the interior of the heat exchanger shell is provided with more than one heat exchange tube, the heat exchange tube passes through the more than one baffle plates and is vertically plugged into the end plug-in plates at both ends of the heat exchanger shell, the heat exchange tube is sealed and connected to the end plug-in plates, and is characterized in that: the more than one heat exchange tubes are arranged in a regular hexagonal position relationship from the center of the plane where the plug-in plate is located to the circumference, and the horizontally arranged heat exchange tubes are respectively relatively located above or below between two adjacent horizontally arranged heat exchange tubes.

[0009] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the center distances of adjacent heat exchange tubes in the same row in the horizontal direction are consistent.

[0010] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the straight line where the center of the heat exchange tube in the horizontal direction is located and the straight line where the center of the heat exchange tube in the adjacent row is located are at the same distance from each other.

[0011] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the center distances of adjacent heat exchange tubes in the same row in the horizontal direction are different, and the center distance of adjacent heat exchange tubes close to the vertical central axis is smaller than the center distance between adjacent heat exchange tubes away from the central axis.

[0012] Further, as an improvement of an embodiment of the present invention, a circular tube titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the minimum spacing between the adjacent heat exchange tubes in the same row in the horizontal direction is calculated by the following formula:

[0013] L i =(ln(X j+1 -Xj )+1)L1

[0014] In the above formula, L i Refers to the minimum spacing between heat exchange tubes, where i is 0.1.2.3…; L1 is the minimum spacing between the heat exchange tubes on the left side of the first row of center axis and the heat exchange tubes on the right side of the first row of center axis; X j It is the distance from the center of any heat exchange tube to the longitudinal median axis, where X is ABC…, and j is 1.2.3….

[0015] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the number of the heat exchange tubes increases by one per row from top to bottom in the vertical direction until the heat exchange tubes are located on the straight line where the horizontal central axis is located, and the heat exchange tubes are arranged symmetrically relative to the straight line where the horizontal central axis is located.

[0016] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the heat exchange tube is plugged into the baffle plate and sealed by polytetrafluoroethylene.

[0017] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the outer wall of the heat exchange tube, the inner wall of the heat exchanger shell and the inner wall surface of the end plug-in plate are covered with a passivation coating, and the passivation coating can resist corrosion and prevent ion penetration.

[0018] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the outer wall of the heat exchange tube, the inner wall of the heat exchanger shell and the inner wall of the end plug-in plate are made by surface corrosion with oxalic acid and attachment of iridium ferrule.

[0019] The present invention also provides a heat exchange device, including a circular tube titanium heat exchanger, characterized in that the circular tube titanium heat exchanger adopts any of the circular tube titanium heat exchangers described in the above embodiments for uniform heat exchange in the horizontal direction.

[0020] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0021] First of all, using titanium as a manufacturing element for heat exchangers can effectively utilize the excellent metal properties of titanium, namely, resistance to high temperature, corrosion, acid and alkali, so that the heat exchanger can work stably regardless of whether it is a refrigerant working medium or a hot medium working medium, and has extremely high heat exchange efficiency.

[0022] Secondly, by controlling the spacing between the heat exchange tubes, in the case of low medium flow and low internal pressure, select heat exchange tubes with equal spacing to reduce installation costs; in the case of high flow and high internal pressure, select heat exchange tubes with a spacing that is logarithmically distributed relative to the vertical center axis, ensuring that the closer to the middle, the smaller the spacing of the pipes with a higher flow rate, and between the pipes close to the edge, increase the spacing of the pipes so that the entire row of heat exchange tubes in the horizontal direction has a relatively uniform flow rate. Among them, the spacing is logarithmically distributed relative to the vertical center axis because for circular tubes, especially for circular tube heat exchangers with inlets and outlets located at the upper and lower ends of the vertical center axis, the flow rate of the heat transfer medium is also logarithmically distributed, that is, the flow rate from the vertical center axis to the edge gradually decreases in a logarithmic trend. At this time, setting the spacing in an inverse logarithmic relationship can ensure that it operates at a constant flow rate.

[0023] Third, the sealing material is made of polytetrafluoroethylene and the titanium surface is coated with a passivation coating to further enhance the anti-corrosion ability between the heat exchanger and the heat transfer medium, giving it a longer service life and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0025] Figure 1 A vertical front cross-sectional schematic diagram of a circular tube-type titanium heat exchanger with uniform heat exchange in a horizontal direction provided by an embodiment of the present invention;

[0026] Figure 2 A vertical side cross-sectional schematic diagram of a circular tube-type titanium heat exchanger with uniform heat exchange in a horizontal direction provided by an embodiment of the present invention;

[0027] Figure 3 A partial schematic diagram of a vertical side section of a circular tube-type titanium heat exchanger with uniform heat exchange in a horizontal direction provided by an embodiment of the present invention;

[0028] Figure 4 Another partial schematic diagram of a vertical side section of a circular tube-type titanium heat exchanger with uniform heat exchange in a horizontal direction provided by an embodiment of the present invention;

[0029] Figure 5 A partial schematic diagram of a vertical side cross-section of a circular tube-type titanium heat exchanger with uniform heat exchange in a horizontal direction according to another embodiment of the present invention;

[0030] Figure numerals: 1. heat exchanger housing, 2. end plug-in plate, 3. mounting through hole, 4. liquid inlet, 5. inlet mounting through hole, 6. heat exchange tube, 7. baffle plate, 8. liquid outlet. DETAILED DESCRIPTION

[0031] Please refer to the attached figure below Figure 1 to Figure 5 And the text content understands the content of the invention and the differences between the invention and the prior art.

[0032] The following further describes in detail the technical solutions of the present invention including the preferred technical solutions through the accompanying drawings and by listing some optional embodiments of the present invention.

[0033] It should be noted that any technical feature and any technical solution in the present embodiment are one or several of multiple optional technical features or optional technical solutions. For the sake of brevity, this document cannot list all the alternative technical features and alternative technical solutions of the present invention, nor is it convenient to emphasize that each implementation method of each technical feature is one of multiple optional implementation methods. Therefore, those skilled in the art should know that any technical means provided by the present invention can be replaced or any two or more technical means or technical features provided by the present invention can be combined with each other to obtain a new technical solution.

[0034] Any technical features and any technical solutions in this embodiment do not limit the protection scope of the present invention. The protection scope of the present invention should include any alternative technical solutions that can be thought of by those skilled in the art without creative work, as well as new technical solutions obtained by those skilled in the art by combining any two or more technical means or technical features provided by the present invention.

[0035] At least one objective of the present invention is to propose a circular tube titanium heat exchanger with uniform heat exchange in the horizontal direction. On the basis of solving the above-mentioned technical problems, it can reduce the deposition and scaling of materials between the surface of the heat exchange tube and the inner wall of the heat exchanger, reduce the chemical reaction between the materials and the heat exchange tubes, and enable the heat exchange between the heat exchange tubes in the same row to exchange heat with the materials uniformly. The heat exchange tubes in the same row have basically the same surface flow rate, and thus have similar service life, thereby improving the overall service life and economy of the titanium heat exchanger.

[0036] To achieve the above object, the present invention provides the following technical solutions:

[0037] The present invention provides a circular tubular titanium heat exchanger with uniform heat exchange in the horizontal direction, comprising a circular tubular heat exchanger shell 1, wherein the two ends of the heat exchanger shell 1 are respectively provided with end plug-in plates 2, and the outer circumference of the end plug-in plate 2 has more than one plug-in plate mounting through-hole 3, one end of the heat exchanger shell 1 is located at the vertex of the vertical central axis and has a cylindrical liquid inlet 4, and the end of the liquid inlet 4 away from the heat exchanger shell 1 has a horizontal annular inlet mounting edge, and the annular inlet mounting edge has more than one inlet mounting through-hole 5, and the other end of the heat exchanger shell 1 is located at the bottom point of the vertical central axis and has a cylindrical liquid outlet 8, and the end of the liquid outlet 8 away from the heat exchanger shell 1 has a horizontal annular outflow mounting edge, and the annular outflow mounting edge has more than one outflow mounting through-hole 5, and the interior of the heat exchanger shell 1 has more than one vertical baffle plate 7, and the baffle plate 7 is connected to the top or bottom of the heat exchanger shell 1 at intervals, The heat exchanger shell 1 has more than one heat exchange tube 6 inside, and the heat exchange tube 6 passes through the more than one baffle plates 7 and is vertically plugged into the end plug-in plates 2 at both ends of the heat exchanger shell 1. The heat exchange tube 6 is sealed and connected to the end plug-in plates 2, and is characterized in that: the more than one heat exchange tube 6 is arranged in a regular hexagonal position relationship from the center of the plane where the plug-in plate 2 is located to the circumference, and the horizontally arranged heat exchange tubes 6 are respectively relatively located above or below between two adjacent horizontally arranged heat exchange tubes 6.

[0038] Furthermore, as an improvement of an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the center distances of the adjacent heat exchange tubes 6 in the same row in the horizontal direction are consistent with each other.

[0039] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the straight line where the center of the heat exchange tube 6 in the horizontal direction is located and the straight line where the center of the heat exchange tube 6 in the adjacent row is located are at the same distance from each other.

[0040] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the center distances of the adjacent heat exchange tubes 6 in the same row in the horizontal direction are different from each other, and the center distance of the adjacent heat exchange tubes 6 close to the vertical central axis is smaller than the center distance of the adjacent heat exchange tubes 6 away from the central axis.

[0041] Further, as an improvement of the embodiment of the present invention, a circular tube titanium heat exchanger with uniform heat exchange in the horizontal direction is characterized in that the minimum spacing between the adjacent heat exchange tubes 6 in the same row in the horizontal direction is calculated by the following formula:

[0042] L i =(ln(X j+1 -X j )+1)L1

[0043] In the above formula, L i Refers to the minimum spacing between heat exchange tubes, where i is 0.1.2.3…; L1 is the minimum spacing between the heat exchange tube 62 on the left side of the center axis of the first row and the heat exchange tube 63 on the right side of the center axis of the first row; X j It is the distance from the center of any heat exchange tube to the longitudinal median axis, where X is ABC…, and j is 1.2.3….

[0044] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the number of the heat exchange tubes 6 increases by one per row from top to bottom in the vertical direction until the heat exchange tubes 6 are located on the straight line where the horizontal central axis is located, and the heat exchange tubes 6 are arranged symmetrically relative to the straight line where the horizontal central axis is located.

[0045] Furthermore, as an improvement of an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the heat exchange tube 6 is inserted into the baffle plate 7 and sealed by polytetrafluoroethylene.

[0046] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the outer wall of the heat exchange tube 6, the inner wall of the heat exchanger shell 1 and the inner wall surface of the end plug-in plate 2 are covered with a passivation coating, and the passivation coating can resist corrosion and prevent ion penetration.

[0047] Furthermore, as an improvement to an embodiment of the present invention, a circular tube-type titanium heat exchanger with uniform heat exchange in the horizontal direction is provided, characterized in that the outer wall of the heat exchange tube 6, the inner wall of the heat exchanger shell 1 and the inner wall of the end plug-in plate 2 are made by surface corrosion with oxalic acid and attachment of iridium ferrule.

[0048] The present invention also provides a heat exchange device, including a circular tube titanium heat exchanger, characterized in that the circular tube titanium heat exchanger adopts any of the circular tube titanium heat exchangers described in the above embodiments for uniform heat exchange in the horizontal direction.

[0049] Based on the above technical solution, the embodiments of the present invention can at least produce the following technical effects:

[0050] First of all, using titanium as a manufacturing element for heat exchangers can effectively utilize the excellent metal properties of titanium, namely, resistance to high temperature, corrosion, acid and alkali, so that the heat exchanger can work stably regardless of whether it is a refrigerant working medium or a hot medium working medium, and has extremely high heat exchange efficiency.

[0051] Secondly, by controlling the spacing between the heat exchange tubes, in the case of low medium flow and low internal pressure, select heat exchange tubes with equal spacing to reduce installation costs; in the case of high flow and high internal pressure, select heat exchange tubes with a spacing that is logarithmically distributed relative to the vertical center axis, ensuring that the closer to the middle, the smaller the spacing of the pipes with a higher flow rate, and between the pipes close to the edge, increase the spacing of the pipes so that the entire row of heat exchange tubes in the horizontal direction has a relatively uniform flow rate. Among them, the spacing is logarithmically distributed relative to the vertical center axis because for circular tubes, especially for circular tube heat exchangers with inlets and outlets located at the upper and lower ends of the vertical center axis, the flow rate of the heat transfer medium is also logarithmically distributed, that is, the flow rate from the vertical center axis to the edge gradually decreases in a logarithmic trend. At this time, setting the spacing in an inverse logarithmic relationship can ensure that it operates at a constant flow rate.

[0052] Third, the sealing material is made of polytetrafluoroethylene and the titanium surface is coated with a passivation coating to further enhance the anti-corrosion ability between the heat exchanger and the heat transfer medium, giving it a longer service life and stability.

[0053] The following is a brief introduction to the manufacturing process of the titanium heat exchange tube of the present invention:

[0054] 1. Material selection

[0055] 1. Material selection is the first step of the processing technology and is also a relatively important part. According to the customer's drawing requirements, the corresponding brand and specification of materials should be selected, and the quality of the material selection will directly affect the quality and use of the anode; 2. When selecting materials, pay attention to the following: titanium mesh: no broken wires or broken roots should appear; titanium plate: the plate shape should be better, and a relatively flat plate should be selected. At the same time, pay attention to the surface without peeling, delamination, cracks, and other defects. Choose the right material to reduce losses.

[0056] 2. Cutting

[0057] 1. After determining the shape, quantity or quality of the material required to make a certain device or product, take the material from the whole or batch of materials; 2. The process of taking a certain shape, quantity or quality of material; 3. After selecting the material, make a certain shape and quantity according to the drawings and customer requirements. Mark, dot and punch holes. Whether it needs to be polished, it must be operated strictly according to the requirements of the drawings. Reasonably plan the processing technology to reduce losses; 4. Cutting materials must be accurate.

[0058] 3. Welding

[0059] After cutting and punching, some products need to be welded. The welding of titanium materials mainly adopts the method of argon arc welding. Only the same materials can be welded together. The welding method of plates and pipes is to fix them by spot welding first, and then weld them fully. For meshes, only electric welding can be used.

[0060] 4. Sandblasting

[0061] 1. A process in which sand is sprayed onto the surface of a titanium substrate using a sandblasting machine with the help of compressed air. Sand is sprayed onto the substrate for impact grinding to remove impurities, variegated colors and oxide layers on the surface. At the same time, the sandblasting machine roughens the surface of the titanium substrate, increases the effective contact area of ​​the titanium surface, and enhances the adhesion between the coating and the surface; 2. The key point of sandblasting is that the pitting and pockmarks should be evenly sprayed without any gaps.

[0062] 5. Pickling

[0063] 1. The pickling solution of the pickling process is generally a mixture of multiple acids, mainly sulfuric acid, nitric acid and hydrofluoric acid. These mixed acids are highly corrosive, and at the same time have strong oxidizing properties and high temperatures of corrosive media, which puts high demands on the corrosion resistance of anti-corrosion materials. Pour oxalic acid into boiling water according to a certain ratio, and put the substrate into a boiling pot for boiling and soaking; 2. Oxalic acid can not only effectively remove the blue oxide scale on the substrate during annealing, but also make the substrate surface rougher and remove surface impurities through corrosion; 3. During pickling, you should always pay attention to the changes in the titanium matrix to prevent it from becoming titanium oxalate.

[0064] 6. Annealing

[0065] 1. Annealing is a metal heat treatment process that slowly heats the metal to a certain temperature, keeps it for a sufficient time, and then cools it at an appropriate speed; 2. When cutting materials, some materials are bent or deformed. We can use some methods and tools to make simple corrections so that it does not affect the next work too much. However, after the local high temperature of welding and the air pressure of sandblasting, the deformation of the titanium substrate will be very obvious; 3. Annealing can restore the deformed plate (net) to a flat state; 4. Put the plate (net) on a very thick steel plate, and it is required to be flat and align the corners. Put another piece of the same steel plate on the plate (net) and screw it diagonally. Make the lower two steel plates fully squeeze the middle plate (net). Then send it into a furnace with a temperature of about 500 to heat and correct the shape. After a certain time, keep it warm for 2 hours.

[0066] 7. Liquid Preparation

[0067] Prepare the precious metal solution according to the actual needs of the customer. Usually the solution is prepared the day before the coating is planned, because the prepared liquid needs to be dried for a period of time before it can be used. During the drying process, it is necessary to stir constantly to prevent the liquid from settling.

[0068] 8. Brushing, baking, oxidation

[0069] 1. Apply the prepared precious metal liquid evenly on the substrate with a brush, and put it into the drying furnace for drying, so that the liquid can quickly combine with the substrate, and prevent the traces left when the liquid flows down along the substrate. After drying, put it into the furnace that has reached a certain temperature and keep it warm for a certain period of time, and then pull it out to allow it to cool and oxidize naturally. Then apply it by brushing. Repeat: brushing, drying, heating and keeping warm, cooling; 2. In the first 5 times of brushing, the liquid can be applied more to fill the surface of the substrate. In the latter part, less liquid needs to be applied to make the liquid brushed more evenly, and it can also cover the places where the brushing was done in front, so that the coating is beautiful. Wear a mask when brushing, and the environment must be ventilated, dust-free, and especially water-free. To ensure the purity of the liquid and the beauty of the board surface.

[0070] IX. Inspection

[0071] Not only is the production process monitored in real time, but the quantity and specifications of the products are also checked again after production. After passing the enhanced life test, they are packaged and shipped.

[0072] Unless otherwise stated, any technical solution disclosed in the present invention disclosed above, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any technician in the field should understand that the preferred numerical range is only a numerical value with a more obvious technical effect or representative value among many implementable numerical values. Since there are too many numerical values ​​to be exhaustive, the present invention discloses some numerical values ​​to illustrate the technical solution of the present invention, and the numerical values ​​listed above should not constitute a limitation on the scope of protection of the present invention.

[0073] If the words "first", "second" and the like are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of description to distinguish the components, and unless otherwise stated, the above words have no special meaning.

[0074] At the same time, if the above-mentioned invention discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connected by bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except when it is obviously impossible to use an one-piece molding process).

[0075] In addition, the terms used in any technical solution disclosed in the present invention to indicate positional relationships or shapes include states or shapes that are similar, similar or close to them unless otherwise stated. Any component provided by the present invention may be assembled from multiple separate components or may be a separate component manufactured by an integrated molding process.

[0076] If the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are used in the description of the present invention, the orientation or position relationship indicated by the above terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device, mechanism, component or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A circular tubular titanium heat exchanger for uniform heat exchange in the horizontal direction, comprising a circular tubular heat exchanger shell (1), wherein both ends of the heat exchanger shell (1) are respectively provided with end plug-in plates (2), and the outer circumference of the end plug-in plates (2) has more than one plug-in plate mounting through holes (3), one end of the heat exchanger shell (1) is located at the vertex of the vertical center axis and has a cylindrical liquid inlet (4), and the end of the liquid inlet (4) away from the heat exchanger shell (1) has a horizontal annular inlet mounting edge, and the annular inlet mounting edge has more than one inlet mounting through holes (5), and the other end of the heat exchanger shell (1) is located at the bottom point of the vertical center axis and has a cylindrical liquid outlet ( 8), the liquid outlet (8) has a horizontal annular outflow mounting edge at one end away from the heat exchanger shell (1), and the annular outflow mounting edge has more than one outflow mounting through hole (5), the heat exchanger shell (1) has more than one vertical baffle plate (7) inside, and the baffle plate (7) is connected to the top or bottom of the heat exchanger shell (1) at intervals, and the heat exchanger shell (1) has more than one heat exchange tube (6) inside, and the heat exchange tube (6) passes through the more than one baffle plate (7) and is vertically plugged into the end plug-in plate (2) at both ends of the heat exchanger shell (1), and the heat exchange tube (6) is sealed and connected to the end plug-in plate (2), characterized in that: The more than one heat exchange tubes (6) are arranged in a regular hexagonal position relationship from the center of the plane where the plug-in plate (2) is located to the circumference, and the heat exchange tubes (6) arranged in the horizontal direction are respectively located above or below the two adjacent heat exchange tubes (6) arranged in the horizontal direction; The center distances of the adjacent heat exchange tubes (6) in the same row in the horizontal direction are different from each other, and the center distance of the adjacent heat exchange tubes (6) close to the vertical central axis is smaller than the center distance of the adjacent heat exchange tubes (6) far from the central axis; The minimum spacing between the heat exchange tubes (6) adjacent to each other in the same row in the horizontal direction is calculated by the following formula: L i =(ln(X j+1 -X j )+1)L1 In the above formula, L i Refers to the minimum spacing between heat exchange tubes, where i is 0.1.2.3...; L1 is the minimum spacing between the heat exchange tube (62) on the left side of the center axis of the first row and the heat exchange tube (63) on the right side of the center axis of the first row; X j is the distance from the center of any heat exchange tube to the longitudinal median axis, where X is ABC…, and j is 1.2.3…; The number of the heat exchange tubes (6) increases by one per row from top to bottom in the vertical direction until the heat exchange tubes (6) are located on the straight line where the horizontal central axis is located, and the heat exchange tubes (6) are arranged symmetrically relative to the straight line where the horizontal central axis is located.

2. A circular tube titanium heat exchanger with uniform heat exchange in horizontal direction according to claim 1, characterized in that The heat exchange tube (6) is plugged into the baffle plate (7) and sealed by polytetrafluoroethylene.

3. The circular tube titanium heat exchanger with uniform heat exchange in horizontal direction according to claim 1, characterized in that The outer wall of the heat exchange tube (6), the inner wall of the heat exchanger shell (1) and the inner wall of the end plug-in plate (2) are covered with a passivation coating, which is corrosion-resistant and prevents ion penetration.

4. A circular tube titanium heat exchanger with uniform heat exchange in horizontal direction according to claim 3, characterized in that The outer wall of the heat exchange tube (6), the inner wall of the heat exchanger shell (1) and the inner wall of the end plug-in plate (2) are made by surface corrosion with oxalic acid and attachment of iridium ferrule.

5. A heat exchange device, comprising a circular tube titanium heat exchanger, characterized in that: The circular tube titanium heat exchanger adopts a circular tube titanium heat exchanger with uniform heat exchange in horizontal direction as described in any one of claims 1 to 4.

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