Coolers used for heat exchange of process gas in sulfuric acid plants

Abstract

This invention provides a cooler for heat exchange of process gas in a sulfuric acid plant. The cooler is a frame-box structure heat exchanger, including a frame box, a fixed tube sheet, and a movable tube sheet. It also includes multiple finned heat exchange tubes disposed within the box. The same end of each heat exchange tube passes through the tube sheet and is sealed at the connection point. The same ends of adjacent heat exchange tubes are connected via a connecting elbow. The cooler also includes an elastic connector, which includes an annular mounting plate installed outside the frame box. The two are circumferentially sealed at their connection point. The periphery of the hollow area inside the annular mounting plate has a first cylindrical connecting portion extending axially along the annular mounting plate towards the movable tube sheet. The extended end of the cylindrical portion is circumferentially fixed and sealed to the movable tube sheet. This application solves the problem of heat exchange tube thermal expansion by using a movable tube sheet and an elastic connector. The connecting elbow is located outside the box, preventing process gas leakage from the box and also preventing corrosion of the connecting elbow.

Description

Technical Field

[0001] This utility model relates to the field of gas cooling technology, and in particular to a cooler used for heat exchange of process gas in a sulfuric acid plant. Background Technology

[0002] The core requirement for coolers used for process gases is to achieve efficient heat exchange between high-temperature, high-pressure liquids and process gases, while also considering engineering constraints such as small footprint, material savings, and adaptability to thermal expansion. Because the heat transfer coefficient of process gases (gas side) is relatively low (gas has weaker thermal conductivity than liquid), the overall heat transfer efficiency needs to be improved by increasing the heat exchange area on the gas side; while on the liquid side, due to its high-temperature, high-pressure characteristics, both pressure resistance and material economy must be considered.

[0003] Existing process gas coolers use finned heat exchange tubes. The gas side consists of the outer surface of the circular tube and fins, while the liquid side is located inside the circular tube. The fins increase the heat exchange area on the gas side, compensating for the low heat transfer coefficient of the gas and enhancing the heat transfer effect on the gas side. This is because process gases have large flow rates and low pressures (large gas volumetric flow rate, easier diffusion at low pressure). Figure 1 As shown, the common structure of a process gas cooler is that finned heat exchange tubes 3 are horizontally placed inside a rectangular box 1, with both ends connected by connecting elbows (connecting pipes) 4. The rectangular box 1 is welded from steel plates, forming a sealed cavity; the left and right sides are perforated tube sheets 2, the finned portion of the finned heat exchange tubes 3 is located inside the rectangular box 1, and the connecting elbows 4 are located outside the box 1. A rectangular cavity 11 is located on the side of the connecting elbows 4 to ensure the airtightness of the shell side. The finned heat exchange tubes 3 are not welded to the tube sheets 2. This process gas cooler is assembled at room temperature. When operating in a high-temperature environment, the finned heat exchange tubes 3 will experience thermal stress expansion during the process of heating from a low temperature to a high temperature.

[0004] During operation, the process gas cooler frequently experiences leaks in the bare sections of the finned heat exchange tubes 3 and the connecting elbows 4, causing abnormal shutdowns of the entire sulfuric acid plant. Analysis revealed that the leaks are caused by process gas entering the rectangular housing 1 of the cooler flowing through the gap between the tube sheet 2 and the finned heat exchange tubes 3 into the rectangular cavity 11 containing the connecting elbows 4. Within the rectangular cavity 11, the process gas does not circulate. When the local temperature drops below the dew point temperature of the process gas, water vapor or other acidic components in the process gas condense into liquid, forming a highly corrosive acid. Over time, the metal surface of the bare tubes or connecting elbows 4 corrodes and thins, eventually leading to penetration and leakage. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defects in the prior art where leakage often occurs in the bare tube section of the finned heat exchange tube and the connecting elbow during the use of process gas coolers, causing abnormal shutdown of the unit. The present invention provides a cooler for heat exchange of process gas in a sulfuric acid plant.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution:

[0007] This utility model provides a cooler for exchanging heat for process gas in a sulfuric acid plant. The cooler is a frame box structure heat exchanger, which includes a frame box and a tube sheet. The tube sheet includes a fixed tube sheet and a movable tube sheet.

[0008] The cooler also includes multiple finned heat exchange tubes, which are arranged inside the frame box. The same end of the multiple finned heat exchange tubes passes through the tube sheet and is sealed at the connection between the finned heat exchange tube and the tube sheet. The same ends of two adjacent finned heat exchange tubes are connected by a connecting elbow.

[0009] The cooler also includes an elastic connector, which includes an annular mounting plate. The annular mounting plate is installed on the outside of the frame housing and is circumferentially sealed to the frame housing at the connection point. The periphery of the hollow area inside the annular mounting plate has a first cylindrical connecting portion extending axially along the direction of the movable tube plate and toward the movable tube plate. The extended end of the first cylindrical connecting portion is circumferentially fixed and sealed to the movable tube plate.

[0010] In this design, a movable tube sheet and elastic connectors are used to enclose one side of the frame housing. The connecting elbow for the finned heat exchange tubes is located on the outside of the frame housing. The frame housing and the movable tube sheet are connected by the elastic connectors. The annular mounting plate included in the elastic connectors is circumferentially sealed to the frame housing at the connection point. The first cylindrical connecting part included in the elastic connectors is circumferentially fixed and sealed to the movable tube sheet. The elastic connectors provide elastic deformation space for the movable tube sheet. When the finned heat exchange tubes elongate due to thermal expansion, the finned heat exchange tubes push the movable tube sheet, and the movable tube sheet pushes the elastic connectors. The elastic connectors deform to absorb the thermal expansion displacement. At the same time, this structure can completely isolate the connecting elbow outside the frame housing, and the process gas inside the frame housing will not leak, avoiding corrosion of the connecting elbow.

[0011] Optionally, the annular mounting plate further includes a second cylindrical connecting portion, which is formed by extending axially from the outer periphery of the annular mounting plate toward the annular mounting plate, and the extending direction of the second cylindrical connecting portion is the same as the extending direction of the first cylindrical connecting portion.

[0012] The extended end of the second cylindrical connecting part is welded and sealed to the frame box in a circumferential direction.

[0013] In this solution, the annular mounting plate is firmly locked to the frame box by the second cylindrical connecting part, providing a stable basis for the elastic deformation of the first cylindrical connecting part. At the same time, the circumferential seal can also eliminate the risk of process gas leakage.

[0014] Optionally, the connection between the first cylindrical connecting portion and the annular mounting plate is rounded.

[0015] And / or, the connection between the second cylindrical connecting part and the annular mounting plate is rounded.

[0016] In this design, right-angle connections are prone to causing localized stress concentration at the connection between the first cylindrical connection (or the second cylindrical connection) and the annular mounting plate. Rounded corner transitions can disperse stress through smooth curvature.

[0017] Optionally, the annular mounting plate has a rectangular structure, and the outer peripheral surface of the first cylindrical connecting part matches the outer peripheral surface shape of the movable tube plate.

[0018] Optionally, the vertical distance between the outer surface of the first cylindrical connecting part and the inner surface of the second cylindrical connecting part is 80-120 mm;

[0019] And / or, the radius of the fillet at the connection between the first cylindrical connecting part and the annular mounting plate is 100-150mm, and the radius of the fillet at the connection between the second cylindrical connecting part and the annular mounting plate is 100-150mm.

[0020] Optionally, the frame box includes a frame, a closing plate, and the tube plate, with a receiving space formed inside the frame. The closing plate, the tube plate, and the elastic connector together close the frame to make the receiving space sealed on all sides.

[0021] In this solution, by setting up a sealed containment space, the leakage of process gas in the frame box can be prevented.

[0022] Optionally, the fixed tube sheet and the movable tube sheet are disposed opposite to each other at both ends of the frame;

[0023] The movable tube sheet is correspondingly provided with the elastic connector, wherein the annular mounting plate is correspondingly mounted on the frame.

[0024] Optionally, the frame is constructed and welded from rectangular square tubes;

[0025] And / or, multiple finned heat exchange tubes are arranged horizontally in parallel.

[0026] Optionally, the upper and lower opposite surfaces of the frame housing are respectively connected to the process gas inlet device and the process gas outlet device.

[0027] Optionally, the cooler further includes a support plate disposed within the frame housing, the support plate having through holes for the finned heat exchange tubes to pass through, and the support plate being used to support the finned heat exchange tubes.

[0028] The positive and progressive effects of this utility model are as follows:

[0029] In this invention, the problem of thermal expansion of finned heat exchange tubes along their length is solved by setting a movable tube sheet. The connecting elbow of the finned heat exchange tube is located on the outside of the frame box. The frame box and the movable tube sheet are connected by an elastic connector. The annular mounting plate of the elastic connector is circumferentially sealed to the frame box at the connection point. The first cylindrical connecting part of the elastic connector is circumferentially fixed and sealed to the movable tube sheet. The elastic connector provides deformation release space for the movable tube sheet and the finned heat exchange tube. When the finned heat exchange tube deforms and shifts due to temperature, the elastic connector can absorb these deformations. At the same time, this structure can completely isolate the connecting elbow outside the frame box, and the process gas inside the frame box will not leak, avoiding corrosion of the connecting elbow. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a cooler used for heat exchange of process gas in a sulfuric acid plant in the prior art;

[0031] Figure 2 This is a schematic diagram of the structure of a cooler used for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention.

[0032] Figure 3 A schematic diagram of the frame structure of a cooler for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the overall structure of an elastic connecting member for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention;

[0034] Figure 5 A partial structural schematic diagram of an elastic connecting member for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the connection structure of an elastic connector, frame box, and movable tube sheet in a sulfuric acid plant for heat exchange of process gas, provided in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] Frame box 1

[0038] Rectangular cavity 11

[0039] Active tube sheet 2

[0040] Finned heat exchange tube 3

[0041] Connecting elbow 4

[0042] 5 flexible connectors

[0043] Circular mounting plate 51

[0044] First cylindrical connecting part 52

[0045] Second cylindrical connecting part 53

[0046] Fixed tube sheet 6

[0047] Pipeline medium outlet manifold 7

[0048] Pipe-side medium inlet manifold 8

[0049] Support plate 9 Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0052] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0053] Please see Figures 2 to 6 This utility model provides a cooler for heat exchange of process gas in a sulfuric acid plant. Figure 2 This is a schematic diagram of the structure of a cooler used for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention. Figure 3 A schematic diagram of the frame structure of a cooler for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention; Figure 4 A schematic diagram of the overall structure of the elastic connector 5 of a cooler used for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention; Figure 5 A partial structural schematic diagram of the elastic connector 5 of a cooler used for heat exchange of process gas in a sulfuric acid plant according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the connection structure of an elastic connector, frame housing, and movable tube sheet in a sulfuric acid plant used for heat exchange of process gas, according to an embodiment of the present invention. Figures 2 to 6 As shown, the cooler is a frame box structure heat exchanger, which includes a frame box 1 and a tube sheet. The tube sheet includes a fixed tube sheet 6 and a movable tube sheet 2. The cooler also includes multiple finned heat exchange tubes 3, which are arranged inside the frame box 1. The same end of the multiple finned heat exchange tubes 3 passes through the movable tube sheet 2 and is sealed and welded at the connection between the finned heat exchange tubes 3 and the movable tube sheet 2. The same end of two staggered adjacent finned heat exchange tubes 3 is connected by a connecting elbow 4. The cooler also includes an elastic connector 5, which includes an annular mounting plate 51. The annular mounting plate 51 is installed on the outside of the frame box 1 and is circumferentially sealed to the frame box 1 at the connection. The periphery of the hollow area inside the annular mounting plate 51 has a first cylindrical connecting part 52 extending axially towards the movable tube sheet 2 and along the direction of the annular mounting plate 51. The extended end of the first cylindrical connecting part 52 is circumferentially fixed and sealed and welded to the movable tube sheet 2.

[0054] By setting the movable tube sheet 2 to release the thermal expansion generated by the finned heat exchange tube 3, the connecting elbow 4 of the finned heat exchange tube 3 is located on the outside of the frame box 1. The frame box 1 and the movable tube sheet 2 are connected by an elastic connector 5. The annular mounting plate 51 of the elastic connector 5 is circumferentially sealed to the frame box 1 at the connection. The first cylindrical connecting part 52 of the elastic connector 5 is circumferentially fixed and sealed to the movable tube sheet 2. The elastic connector 5 provides elastic deformation space for the movable tube sheet 2. When the finned heat exchange tube 3 causes thermal expansion in the length direction due to temperature change and pushes the movable tube sheet 2 to move, the elastic connector 5 can absorb these displacements through its own deformation. At the same time, this structure can completely isolate the connecting elbow 4 outside the frame box 1, and the process gas inside the frame box 1 will not leak. During use, the process gas does not come into contact with the connecting elbow 4, eliminating dew point corrosion caused by the process gas being below the dew point, solving the problem of corrosion leakage of the connecting elbow 4, and avoiding corrosion of the connecting elbow 4.

[0055] In this embodiment, the annular mounting plate 51 further includes a second cylindrical connecting portion 53, which is formed by extending axially from the outer periphery of the annular mounting plate 51 toward the annular mounting plate 51, and the extending direction of the second cylindrical connecting portion 53 is the same as the extending direction of the first cylindrical connecting portion 52; the extending end of the second cylindrical connecting portion 53 is circumferentially welded and sealed to the frame box 1.

[0056] The second cylindrical connecting part 53 securely locks the annular mounting plate 51 to the frame box 1, providing a stable foundation for the elastic deformation of the first cylindrical connecting part 52. At the same time, the circumferential seal can also eliminate the risk of process gas leakage.

[0057] Specifically, the frame housing 1 includes a frame constructed from twelve rectangular square tubes welded together to form a cubic frame. The top and bottom surfaces of the frame are unsealed. The upper surface is the process gas inlet, and the lower surface is the process gas outlet, connected to the process gas inlet and outlet devices respectively. A fixed tube plate 6 is welded to the frame. Sealing plates are installed at the front and rear of the frame, also welded to the frame. A movable tube plate 2 is located on the left side of the frame, not welded to the frame. The movable tube plate 2 seals the left side of the frame and is rectangular in shape, forming an accommodating space within the frame. The front and rear sealing plates, the fixed tube plate 6, and the movable tube plate 2 together seal the frame to ensure the accommodating space is airtight.

[0058] Multiple finned heat exchange tubes 3 are installed within the enclosed space formed by the frame. The multiple finned heat exchange tubes 3 are arranged in parallel. One end of the multiple finned heat exchange tubes 3 passes through the movable tube sheet 2 on the left side of the frame. The connection between the finned heat exchange tubes 3 and the movable tube sheet 2 is sealed and welded. The other end of the multiple finned heat exchange tubes 3 passes through the fixed tube sheet 6 on the right side of the frame. The connection between the finned heat exchange tubes 3 and the fixed tube sheet 6 is also sealed and welded. The same end of two staggered adjacent finned heat exchange tubes 3 is connected by a connecting elbow 4. The connecting elbow 4 connects the finned heat exchange tubes 3 into a serpentine pipe. The inlet of the serpentine pipe is connected to the tube-side medium inlet manifold 8, and the outlet of the serpentine pipe is connected to the tube-side medium outlet manifold 7. Both the tube-side medium inlet manifold 8 and the tube-side medium outlet manifold 7 are located outside the frame box 1, and the connecting elbow 4 is also located outside the frame box 1.

[0059] By sealing and welding the finned heat exchange tube 3 and the movable tube sheet 2, and sealing and welding the connection between the finned heat exchange tube 3 and the fixed tube sheet 6, the process gas inside the frame box 1 can be prevented from flowing out from the connection.

[0060] In this embodiment, the cooler also includes a support plate 9, which is disposed inside the frame housing 1. The support plate 9 has through holes for the finned heat exchange tube 3 to pass through, and the support plate 9 is used to support the finned heat exchange tube 3.

[0061] like Figure 4As shown, the annular mounting plate 51 has a rectangular structure with rounded corners at all four corners. The periphery of the hollow inner region of the annular mounting plate 51 has a first cylindrical connecting portion 52 extending axially towards the movable tube plate 2. The extended end of the first cylindrical connecting portion 52 is circumferentially fixed and sealed to the movable tube plate 2, and the outer circumferential surface of the first cylindrical connecting portion 52 matches the shape of the opening in the frame.

[0062] In this embodiment, the connection between the first cylindrical connecting part 52 and the annular mounting plate 51 is rounded, and the connection between the second cylindrical connecting part 53 and the annular mounting plate 51 is also rounded. The smooth curvature can disperse stress.

[0063] Specifically, the cross-section of the elastic connector 5 is U-shaped, and the two sides of the U-shaped elastic connector 5 are of unequal length. The axial extension length of the first cylindrical connecting part 52 is greater than that of the second cylindrical connecting part 53. The vertical distance between the outer surface of the first cylindrical connecting part 52 and the inner surface of the second cylindrical connecting part 53 is 80-120mm.

[0064] The radius of the fillet at the connection between the first cylindrical connecting part 52 and the annular mounting plate 51 is 100-150 mm, and the radius of the fillet at the connection between the second cylindrical connecting part 53 and the annular mounting plate 51 is 100-150 mm.

[0065] like Figure 3 As shown, in this embodiment, a frame constructed from twelve rectangular stainless steel tubes of S30408 ​​material is used as the support structure. This can improve the overall rigidity of the heat exchange module, reduce the thickness of the movable tube sheet 2 and the fixed tube sheet 6, and eliminate the original rectangular cavities connecting the left and right sides of the elbow 4, thereby reducing the weight of the equipment and lowering the equipment cost.

[0066] In this embodiment, the fixed tube plate 6 and the movable tube plate 2 are arranged opposite to each other at both ends of the frame. The movable tube plate 2 is provided with an elastic connector 5, and the annular mounting plate 51 is installed on the frame.

[0067] Based on the above description of the structure of the process gas cooler, the assembly process of the cooler is described in detail below:

[0068] In this embodiment, a frame composed of twelve rectangular tubes is constructed, which, after welding, can withstand the weight of all internal components of the cooler. The finned heat exchange tubes 3 are composed of seamless steel pipes and steel strips welded at high frequency. The winding height and pitch of the steel strips are determined according to the heat load process calculations. The movable tube sheet 2 and fixed tube sheet 6 are drilled with holes according to the bare tube specifications of the finned heat exchange tubes 3. The support plate 9 is drilled with holes according to the dimensions of the finned heat exchange tubes 3 after finning. The support plate 9 is placed inside the frame housing 1 beforehand. The finned heat exchange tubes 3 pass through the support plate 9. The movable tube sheet 2 and fixed tube sheet 6 pass through the bare tube portions from both ends of the finned heat exchange tubes 3. Then, the fixed tube sheet 6 is welded onto the assembled frame. The finned heat exchange tubes 3 are welded to the movable tube sheet 2 and the fixed tube sheet 6, with symmetrical, skip-position welding to prevent uneven heating and deformation of the movable tube sheet 2 or the fixed tube sheet 6. Then, connecting elbows 4 are welded to both ends of the finned heat exchange tubes 3. Next, the elastic connectors 5 and the sealing plates at the front and rear of the frame are assembled. Finally, a pressure test is performed on the tube side and shell side of the frame.

[0069] The use and working process of this utility model are as follows: High-temperature boiler feedwater from the steam drum enters the tube-side medium inlet manifold 8, and is distributed into the finned heat exchange tubes 3 by the tube-side medium inlet manifold 8. The finned heat exchange tubes 3 expand when heated, and the movable tube sheet 2 expands and moves to the left along the axial direction of the finned heat exchange tubes 3. The elastic connector 5 deforms due to the stress generated by the expansion, absorbing the axial displacement of the finned heat exchange tubes 3. The process gas, which is at a higher temperature than the liquid in the finned heat exchange tubes 3, exchanges heat with the liquid in the finned heat exchange tubes 3. The heated boiler feedwater flows out from the tube-side medium outlet manifold 7. The process gas enters from the top air inlet of the frame housing 1, is cooled by the boiler feedwater, and is discharged from the bottom air outlet of the frame housing 1.

[0070] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the device embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.

[0071] The above description is only a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cooler for heat exchange for process gas in a sulfuric acid plant, characterized in that, The cooler is a frame box structure heat exchanger, which includes a frame box and a tube sheet, and the tube sheet includes a fixed tube sheet and a movable tube sheet. The cooler also includes multiple finned heat exchange tubes, which are arranged inside the frame box. The same end of the multiple finned heat exchange tubes passes through the tube sheet and is sealed at the connection between the finned heat exchange tube and the tube sheet. The same ends of two adjacent finned heat exchange tubes are connected by a connecting elbow. The cooler also includes an elastic connector, which includes an annular mounting plate. The annular mounting plate is installed on the outside of the frame housing and is circumferentially sealed to the frame housing at the connection point. The periphery of the hollow area inside the annular mounting plate has a first cylindrical connecting portion extending axially along the direction of the movable tube plate and toward the movable tube plate. The extended end of the first cylindrical connecting portion is circumferentially fixed and sealed to the movable tube plate.

2. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 1, characterized in that, The annular mounting plate further includes a second cylindrical connecting portion, which is formed by extending axially from the outer periphery of the annular mounting plate toward the annular mounting plate, and the extending direction of the second cylindrical connecting portion is the same as the extending direction of the first cylindrical connecting portion. The extended end of the second cylindrical connecting part is circumferentially fixed and sealed to the frame box body using a rectangular steel tube.

3. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 2, characterized in that, The connection between the first cylindrical connecting part and the annular mounting plate is rounded. And / or, the connection between the second cylindrical connecting part and the annular mounting plate is rounded.

4. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 3, characterized in that, The annular mounting plate has a rectangular structure, and the outer circumferential surface of the first cylindrical connecting part matches the outer circumferential surface of the movable tube plate.

5. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 3, characterized in that, The vertical distance between the outer surface of the first cylindrical connecting part and the inner surface of the second cylindrical connecting part is 80-120mm; And / or, the radius of the fillet at the connection between the first cylindrical connecting part and the annular mounting plate is 100-150mm, and the radius of the fillet at the connection between the second cylindrical connecting part and the annular mounting plate is 100-150mm.

6. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 1, characterized in that, The frame box includes a frame, a closing plate, and the tube plate. A receiving space is formed inside the frame. The closing plate, the tube plate, and the elastic connector together close the frame to make the receiving space sealed on all sides.

7. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 6, characterized in that, The fixed tube sheet and the movable tube sheet are disposed opposite to each other at both ends of the frame; The movable tube sheet is correspondingly provided with the elastic connector, wherein the annular mounting plate is correspondingly mounted on the frame.

8. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 6, characterized in that, The frame is constructed and welded from rectangular square tubes; And / or, multiple finned heat exchange tubes are arranged horizontally in parallel.

9. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 6, characterized in that, The upper and lower opposite surfaces of the frame box are respectively connected to the process gas inlet and outlet devices.

10. The cooler for heat exchange of process gas in a sulfuric acid plant as described in claim 1, characterized in that, The cooler also includes a support plate disposed inside the frame housing. The support plate has through holes through which the finned heat exchange tubes pass, and the support plate is used to support the finned heat exchange tubes.

Images