A demineralized water heater for low-temperature sulfuric acid recovery

Abstract

This utility model belongs to the field of sulfuric acid production technology, specifically relating to a demineralized water heater for low-temperature sulfuric acid recovery. It includes a left tube box, a shell, and a right tube box. Both the left and right tube boxes are detachably connected to the shell via a support mechanism. The left tube box has a sulfuric acid inlet at its upper part, and the right tube box has a sulfuric acid outlet at its lower part. Tube plates are welded to both sides of the shell, and multiple tubes extending axially along the shell are mounted on the two tube plates. A demineralized water inlet is located on the right side of the upper side wall of the shell, and a demineralized water outlet is located on the left side of the lower side wall. A diversion pipe is fixed to the inner wall of the upper side of the shell, with its upper surface connected to the demineralized water inlet at its center. Diversion holes are evenly distributed on the lower surface of the diversion pipe. Insulation layers are provided on the outer walls of the shell, the left tube box, and the right tube box. This heater features high-strength tube plates that provide strong support for the tubes, diverting the demineralized water entering the shell to prevent tube damage, eliminating heat loss, saving energy, and reducing production costs.

Description

Technical Field

[0001] This utility model belongs to the field of sulfuric acid production technology, specifically relating to a demineralized water heater for low-temperature sulfuric acid recovery. Background Technology

[0002] In the low-temperature sulfuric acid recovery system, high-temperature sulfuric acid from the synthesis section flows sequentially through the evaporator, feedwater heater, and demineralized water heater. The demineralized water heater is located at the end and uses the low-temperature waste heat that was not fully recovered from the upstream equipment to preheat the demineralized water, so that the demineralized water can be heated before entering the next process.

[0003] Existing demineralized water heaters are generally horizontal shell-and-tube heat exchangers, with demineralized water flowing through the shell side to absorb heat and sulfuric acid flowing through the tubes side to release heat. However, the flow velocity of demineralized water entering the shell is relatively high, resulting in a significant impact force on the tubes. The tubes are supported only by tube sheets connected to the shell, and due to the limited strength of the tube sheets, their support effect is also limited. The tubes are easily damaged by the vibration caused by the impact of the demineralized water inside the shell. In addition, the outer wall of the demineralized water heater is not equipped with an insulation layer, and heat loss is inevitable during feeding, discharging, and heat exchange. This prevents the full utilization of the waste heat of sulfuric acid, resulting in the discharge of some waste heat and high energy consumption in production. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a demineralized water heater for low-temperature sulfuric acid recovery.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a demineralized water heater for low-temperature sulfuric acid recovery, comprising a left tube box, a shell, and a right tube box; Both the left and right tube boxes are detachably connected to the shell via a support mechanism. The left tube box has a sulfuric acid inlet at the top, and the right tube box has a sulfuric acid outlet at the bottom. Tube sheets are welded to both the left and right sides of the shell. Multiple tubes extending along the axial direction of the shell are installed on the two tube sheets. The two ends of the tubes are respectively connected to the left tube box and the right tube box. The upper side wall of the shell has a demineralized water inlet on the right side and a demineralized water outlet on the left side of the lower side wall. A diversion pipe is fixedly connected to the upper inner wall of the shell. The middle part of the upper surface of the diversion pipe is connected to the demineralized water inlet. Diversion holes are evenly arranged on the lower surface of the diversion pipe. Multiple baffles are fixedly connected inside the shell, and thermal insulation layers are provided on the outer walls of the shell, the left tube box, and the right tube box.

[0006] Furthermore, the support mechanism includes a first support rib, a second support rib, and a support plate; The first support rib is fixedly connected to the right part of the upper and lower outer walls of the left tube box and the left part of the upper and lower outer walls of the right tube box. The second support rib is fixedly connected to the upper and lower outer walls of the shell and the second support rib is fixedly connected to the tube sheet. The support plate is fixedly connected to the upper and lower outer walls of the shell. The first support rib, the tube sheet, the second support rib, and the support plate are connected by fasteners.

[0007] Furthermore, the fastener includes a bolt, and the first support rib, the tube plate, the second support rib, and the support plate are all provided with screw holes adapted to the bolt.

[0008] Furthermore, both the first and second support ribs are triangular structures, and the side of the first support rib closest to the tube sheet and the side of the second support rib connected to the tube sheet are both right-angled sides.

[0009] Furthermore, the spacing between two adjacent baffles near the demineralized water inlet is smaller than the spacing between two adjacent baffles near the demineralized water outlet.

[0010] Furthermore, the tube sheet has a perforation for the tube body to pass through, and a sealing gasket is provided inside the perforation.

[0011] Furthermore, the baffle plate is provided with insertion holes for inserting the tube body.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. In the heater of this utility model, sulfuric acid is introduced into the left tube box and then into the tube body, while demineralized water is introduced into the shell. The demineralized water in the shell exchanges heat with the sulfuric acid in the tube body, and the waste heat of the sulfuric acid is used to heat the demineralized water. In addition, heat insulation layers are provided on the outer walls of the shell, the left tube box and the right tube box to prevent heat from being lost from the tube box and the shell during material feeding, discharging and heat exchange. The waste heat of sulfuric acid is fully recovered and utilized, which not only reduces waste heat emissions, but also reduces production energy consumption.

[0013] 2. This utility model uses a diversion pipe to divert the demineralized water entering the shell, avoiding excessive flow velocity of the demineralized water when it enters the shell, which would cause a large impact force on the tube body. The support mechanism can support the tube sheet, improve the strength of the tube sheet, and thus improve the support effect of the tube sheet on the tube body, preventing the tube body from vibrating and being damaged during heat exchange. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the demineralized water heater for low-temperature sulfuric acid recovery according to this utility model.

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0016] Figure 3 This is a bottom view of the shunt tube in this utility model.

[0017] In the diagram: 1-Left tube box, 2-Sulfuric acid inlet, 3-Shell, 401-First support rib, 402-Bolt, 403-Second support rib, 404-Support plate, 5-Insulation layer, 6-Pipe body, 7-Desalinated water inlet, 8-Diverter pipe, 9-Tube sheet, 10-Right tube box, 11-Sulfuric acid outlet, 12-Baffle plate, 13-Desalinated water outlet, 14-Diverter orifice. Detailed Implementation

[0018] The demineralized water heater for low-temperature sulfuric acid recovery of this utility model will be described in more detail below with reference to the accompanying drawings and specific embodiments.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] See Figure 1 A demineralized water heater for low-temperature sulfuric acid recovery includes a left tube box 1, a shell 3 and a right tube box 10, and the left tube box 1 and the right tube box 10 are connected to the shell 3 by a support mechanism. See Figure 1 and Figure 2 The support mechanism includes a first support rib 401, a second support rib 403, and a support plate 404. The first support rib 401 is fixedly connected to the right side of the upper and lower outer walls of the left tube box 1 and the left side of the upper and lower outer walls of the right tube box 10. The second support rib 403 is fixedly connected to the upper and lower outer walls of the shell 3. Tube plates 9 are welded to both sides of the shell 3. Multiple tubes 6 extending axially along the shell 3 are installed on the two tube plates 9, and the tubes 6 are supported by the tube plates 9. The second support rib 403 is fixedly connected to the tube plates 9, and the support plate 404... 404 is fixed to the upper and lower outer walls of the housing 3. The first support rib 401, the tube sheet 9, the second support rib 403 and the support plate 404 are connected by fasteners, including bolts 402. The first support rib 401, the tube sheet 9, the second support rib 403 and the support plate 404 are all provided with screw holes that are compatible with the bolts 402. The tube sheet 9 is supported by the first support rib 401 and the second support rib 403, which improves the strength of the tube sheet 9 and thus improves the support effect of the tube sheet 9 on the tube body 6.

[0021] See Figure 1 and Figure 2Both the first support rib 401 and the second support rib 403 are triangular structures. The side of the first support rib 401 closest to the tube plate 9 and the side of the second support rib 403 connected to the tube plate 9 are both right-angled sides. The triangular structure provides stronger support and can further improve the support effect of the tube plate 9 on the tube body 6, preventing the tube body 6 from being damaged by vibration.

[0022] See Figure 1 and Figure 3 A sulfuric acid inlet 2 is provided at the upper part of the left tube box 1, through which sulfuric acid is injected into the left tube box 1. A demineralized water inlet 7 is provided on the right side of the upper side wall of the shell 3. A diversion pipe 8 is fixed to the upper inner wall of the shell 3. The middle of the upper surface of the diversion pipe 8 is connected to the demineralized water inlet 7. Diversion flow holes 14 are evenly arranged on the lower surface of the diversion pipe 8. Demineralized water enters the diversion pipe 8 through the demineralized water inlet 7 and then enters the shell 3 through the diversion flow holes 14. This can reduce the flow velocity of demineralized water entering the shell 3, thereby reducing the impact force on the tube body 6. The two ends of the tube body 6 are connected to the left tube box 1 and the right tube box 10, respectively. Sulfuric acid enters the tube body 6 from the left tube box 1. The demineralized water flowing in the shell 3 exchanges heat with the sulfuric acid in the tube body 6, using the residual heat of the sulfuric acid to heat the demineralized water. The lower part of the right tube box 10 has a sulfuric acid outlet 11. After the heat exchange is completed, the sulfuric acid enters the right tube box 10 and is discharged through the sulfuric acid outlet 11. The lower left side wall of the shell 3 has a demineralized water outlet 13. After the heat exchange is completed, the demineralized water is discharged through the demineralized water outlet 13 and enters the next process for processing. By recovering and utilizing the residual heat of the sulfuric acid to heat the demineralized water, not only can waste heat emissions be reduced, but also production energy consumption can be reduced.

[0023] Furthermore, the tube sheet 9 has perforations for the tube body 6 to pass through, and a sealing gasket is installed in the perforation. The sealing gasket ensures that sulfuric acid flows in the left tube box 1, the tube body 6 and the right tube box 10, and demineralized water flows in the shell 3. This prevents sulfuric acid from entering the shell 3 through the perforation from the left tube box 1 or the right tube box 10, or demineralized water from entering the left tube box 1 or the right tube box 10 through the perforation.

[0024] See Figure 1 Multiple baffles 12 are fixedly connected inside the shell 3. The baffles 12 are provided with insertion holes for the tube body 6 to be inserted. The baffles 12 can not only support the tube body 6, but also change the flow direction of the demineralized water in the shell 3, increase the degree of turbulence, increase the contact area between the demineralized water and the tube body 6, so that the demineralized water in the shell 3 and the sulfuric acid in the tube body 6 can fully exchange heat, thereby improving the heat exchange efficiency.

[0025] See Figure 1The spacing between two adjacent baffles 12 near the demineralized water inlet 7 is smaller than the spacing between two adjacent baffles 12 near the demineralized water outlet 13. The smaller spacing of the baffles 12 in the demineralized water inlet section can enhance the turbulence in the demineralized water inlet section of the shell 3, while the larger spacing of the baffles 12 in the demineralized water outlet section can reduce the pressure drop. This unequal spacing of the baffles 12 can improve the overall heat exchange efficiency of the heater.

[0026] See Figure 1 and Figure 2 The outer walls of the shell 3, the left tube box 1 and the right tube box 10 are all provided with heat insulation layer 5, which can prevent heat from being dissipated from the tube box and the shell 3 during material feeding, discharging and heat exchange, thus saving energy and reducing production costs.

[0027] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains. The use of terms such as "a" or "an" in this specification and claims does not necessarily indicate a limitation on quantity. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0028] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention.

Claims

1. A desalting water heater for low temperature sulfuric acid recovery, characterized by: Includes the left tube box, the outer shell, and the right tube box; Both the left and right tube boxes are detachably connected to the shell via a support mechanism. The left tube box has a sulfuric acid inlet at the top, and the right tube box has a sulfuric acid outlet at the bottom. Tube sheets are welded to both the left and right sides of the shell. Multiple tubes extending along the axial direction of the shell are installed on the two tube sheets. The two ends of the tubes are respectively connected to the left tube box and the right tube box. The upper side wall of the shell has a demineralized water inlet on the right side and a demineralized water outlet on the left side of the lower side wall. A diversion pipe is fixedly connected to the upper inner wall of the shell. The middle part of the upper surface of the diversion pipe is connected to the demineralized water inlet. Diversion holes are evenly arranged on the lower surface of the diversion pipe. Multiple baffles are fixedly connected inside the shell, and thermal insulation layers are provided on the outer walls of the shell, the left tube box, and the right tube box.

2. The desalinated water heater for low-temperature sulfuric acid recovery according to claim 1, characterized by: The support mechanism includes a first support rib, a second support rib, and a support plate; The first support rib is fixedly connected to the right part of the upper and lower outer walls of the left tube box and the left part of the upper and lower outer walls of the right tube box. The second support rib is fixedly connected to the upper and lower outer walls of the shell and the second support rib is fixedly connected to the tube sheet. The support plate is fixedly connected to the upper and lower outer walls of the shell. The first support rib, the tube sheet, the second support rib, and the support plate are connected by fasteners.

3. The desalinated water heater for low-temperature sulfuric acid recovery according to claim 2, characterized by: The fasteners include bolts, and the first support rib, the tube plate, the second support rib, and the support plate are all provided with screw holes that are compatible with the bolts.

4. The desalting water heater for sulfuric acid low-temperature recovery according to claim 2 or 3, characterized by: Both the first and second support ribs are triangular structures, and the side of the first support rib closest to the tube sheet and the side of the second support rib connected to the tube sheet are both right-angled sides.

5. The desalting water heater for sulfuric acid low temperature recovery according to claim 1, characterized by: The distance between two adjacent baffles near the demineralized water inlet is smaller than the distance between two adjacent baffles near the demineralized water outlet.

6. The desalting water heater for sulfuric acid low temperature recovery according to claim 1, characterized by: The tube sheet has a through hole for the tube body to pass through, and a sealing gasket is installed in the through hole.

7. The desalting water heater for sulfuric acid low-temperature recovery according to claim 1 or 5, characterized by: The baffle plate has insertion holes for inserting the tube.

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