A feed water heater for sulfuric acid heat recovery

Abstract

The utility model relates to water heater technical field, and disclose a kind of water heater for sulfuric acid heat recovery, shell and fixedly connected in the feed end and the reversing end of both ends of shell, the inside of the shell is provided with cooling bin, the top and bottom of the shell are equipped with drain and water inlet respectively, the drain and water inlet are all communicated with the inside of cooling bin, the both sides of the shell are fixedly connected with baffle respectively to close cooling bin, the utility model provides a kind of water heater for sulfuric acid heat recovery, by the cooperation setting of feed end, shell and reversing end, the sulfuric acid of higher temperature can enter the heat exchange pipe in shell from feed port, cooling water can enter cooling bin from the water inlet of bottom, cooling water is cooled to high-temperature sulfuric acid after the contact of both by heat exchange pipe, by the flow guide mechanism arranged in reversing end, the high-temperature sulfuric acid flowing out in heat exchange pipe can be flow guided.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, specifically to a water heater for sulfuric acid heat recovery. Background Technology

[0002] In the process of producing sulfuric acid from smelting flue gas, the finished sulfuric acid from the absorption tower or drying tower usually has a high temperature. If the large amount of heat energy carried by this high-temperature sulfuric acid is directly discharged or cooled, it will not only waste energy, but also increase the load and operating cost of the subsequent cooling system. Therefore, the efficient recovery of waste heat from high-temperature sulfuric acid for preheating boiler feedwater, process water or other media that need to be heated is of great significance for reducing production energy consumption, improving economic efficiency and realizing green production.

[0003] Shell-and-tube heat exchangers are often selected as key equipment for sulfuric acid heat recovery due to their advantages such as compact structure, strong pressure resistance, and relatively high heat exchange efficiency. In this application, high-temperature sulfuric acid flows through the heat exchange tubes (tube side), while the cooling water to be heated flows outside the heat exchange tubes (shell side), exchanging heat through the tube wall to achieve the dual purpose of cooling sulfuric acid and heating feed water.

[0004] However, existing shell-and-tube feedwater heaters used for sulfuric acid heat recovery still have certain problems in practical applications. To achieve sufficient heat exchange area, a large number of heat exchange tubes are usually arranged inside the heater. The sulfuric acid flow path needs to be turned inside the tubes. At the part where the sulfuric acid flow direction changes (such as the tube box or turning chamber), turbulence, eddies, or even local dead zones are easily formed. This unstable flow state not only increases the flow resistance of the system and increases pumping energy consumption, but also the turbulence will aggravate the erosion and corrosion of the heat exchange tubes and the inner wall of the tube box / turning chamber by sulfuric acid, shortening the service life of the equipment. Therefore, a device is needed to solve the above problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a feedwater heater for sulfuric acid heat recovery, which solves the problem of dead zones that may be formed due to poor flow of sulfuric acid at the reversing end.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a feed water heater for sulfuric acid heat recovery, comprising a shell and an inlet end and a reversing end fixedly connected to both ends of the shell, a cooling chamber being provided inside the shell, a drain outlet and a water inlet being provided at the top and bottom of the shell respectively, both of the drain outlet and the water inlet communicating with the interior of the cooling chamber, and baffles being fixedly connected to both sides of the shell to close the cooling chamber.

[0007] The top and bottom of the feed end are respectively provided with a discharge port and a feed port. A partition is fixedly connected to the inner wall of the feed end. One end of the partition is sealed to a baffle. Multiple heat exchange tubes are connected through the middle of the baffle. The feed port and the discharge port are connected to the inside of the heat exchange tubes. The inside of the reversing end is provided with a flow guiding mechanism to guide the sulfuric acid entering the reversing end.

[0008] Optionally, the flow guiding mechanism includes a replacement seat and flow guiding grooves formed inside the replacement seat. The replacement seat is detachably connected to the inner wall of the reversing end. The number of flow guiding grooves is applied in accordance with the number of heat exchange tube layers to reduce turbulence between adjacent heat exchange tube layers.

[0009] Optionally, the end of the guide channel away from the heat exchange tube is semi-circular to reduce flow resistance.

[0010] Optionally, a through hole is provided in the middle of the reversing end, and a threaded rod is fixedly connected to one end of the replacement seat near the through hole. The threaded rod passes through the through hole to the outside of the reversing end, and a fixing nut is threaded to one end of the threaded rod. One side of the fixing nut fits against one side of the reversing end to fix the replacement seat. Sealing gaskets are provided between the fixing nut and the reversing end and between the replacement seat and the reversing end to prevent material leakage.

[0011] Optionally, a positioning groove is provided on the side of the reversing end near the housing, and a positioning block is provided at the position corresponding to the positioning groove of the replacement seat. The positioning block is detachably connected to the positioning groove to prevent the replacement seat from rotating.

[0012] Optionally, the inner wall of the cooling chamber is fixedly connected with multiple guide plates to adjust the flow direction of the liquid in the cooling chamber, and the heat exchange tube passes through the guide plates.

[0013] Optionally, the outer surface of the heat exchange tube is fixedly connected with multiple extension plates to increase the contact area with the liquid in the cooling chamber.

[0014] Optionally, the bottom of the housing is provided with a support base, and a rib is fixedly connected to the middle of the support base to improve strength.

[0015] This utility model provides a feedwater heater for sulfuric acid heat recovery, which has the following beneficial effects:

[0016] This utility model provides a feedwater heater for sulfuric acid heat recovery. Through the coordinated arrangement of the feed end, shell, and reversing end, high-temperature sulfuric acid can enter the heat exchange tube inside the shell from the feed inlet, and cooling water can enter the cooling chamber from the bottom inlet. After the two come into contact through the heat exchange tube, the cooling water cools the high-temperature sulfuric acid, facilitating subsequent operations. After the sulfuric acid enters the reversing end from the bottom heat exchange tube, it will flow back into the upper heat exchange tube and finally be discharged to the outside from the upper outlet. Through the flow guiding mechanism set in the reversing end, the high-temperature sulfuric acid flowing out of the heat exchange tube can be guided, reducing the turbulence formed by the sulfuric acid in the reversing end, making the sulfuric acid smoother during transportation, and reducing the possibility of dead zones forming by the sulfuric acid in the reversing end. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the unfolded structure of this utility model;

[0019] Figure 3 This is a front cross-sectional view of the present invention.

[0020] Figure 4 This is a schematic diagram of the unfolded replacement seat of this utility model;

[0021] Figure 5 This is a schematic diagram of the heat exchange tube of this utility model.

[0022] In the diagram: 1. Shell; 2. Feeding end; 3. Reversing end; 4. Cooling chamber; 5. Drain outlet; 6. Water inlet; 7. Baffle; 8. Discharge outlet; 9. Feeding inlet; 10. Partition; 11. Heat exchange tube; 12. Replacement seat; 13. Guide channel; 14. Through hole; 15. Threaded rod; 16. Fixing nut; 17. Positioning groove; 18. Positioning block; 19. Guide plate; 20. Extension plate; 21. Support seat. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] Please see Figures 1 to 5This utility model provides a technical solution: a feed water heater for sulfuric acid heat recovery, comprising a shell 1 and a feed end 2 and a reversing end 3 fixedly connected to both ends of the shell 1. A cooling chamber 4 is provided inside the shell 1. A drain outlet 5 and a water inlet 6 are respectively provided at the top and bottom of the shell 1. Both the drain outlet 5 and the water inlet 6 communicate with the interior of the cooling chamber 4. Baffles 7 are fixedly connected to both sides of the shell 1 to close the cooling chamber 4.

[0025] The top and bottom of the feed end 2 are respectively provided with an outlet 8 and a feed inlet 9. A baffle 10 is fixedly connected to the inner wall of the feed end 2. One end of the baffle 10 is sealed to the baffle 7. Multiple heat exchange tubes 11 are connected through the middle of the baffle 7. The feed inlet 9 and the outlet 8 are both connected to the inside of the heat exchange tubes 11. The inside of the reversing end 3 is provided with a flow guiding mechanism to guide the sulfuric acid entering the reversing end 3.

[0026] Cooling water enters the cooling chamber 4 from the inlet 6 at the bottom of the shell 1 and is discharged from the drain 5 at the top of the shell 1 for further use. The baffle 7 divides the cooling chamber 4 inside the shell 1 into a sealed structure to prevent the cooling water from contacting the sulfuric acid and to prevent sulfuric acid leakage. Sulfuric acid enters the feed end 2 from the feed inlet 9. The baffle 10 divides the interior of the feed end 2 into two parts. The sulfuric acid entering the feed end 2 will enter the heat exchange tube 11 on one side and flow from the heat exchange tube 11 into the reversing end 3 at one end. Then, it will re-enter the upper heat exchange tube 11 from the side of the reversing end 3 and enter the feed end 2 along the upper heat exchange tube 11. Finally, it will be discharged from the outlet 8 above the feed end 2, thereby achieving the cooling of sulfuric acid while heating the cooling water. The flow guiding mechanism can guide the sulfuric acid flowing out of the heat exchange tube 11 to reduce the possibility of turbulence and dead zones in the reversing end 3.

[0027] In this embodiment, as a preferred solution, the flow guiding mechanism includes a replacement seat 12 and a flow guiding groove 13 formed inside the replacement seat 12. The replacement seat 12 is detachably connected to the inner wall of the reversing end 3. The number of flow guiding grooves 13 corresponds to the number of heat exchange tubes 11 layers to reduce turbulence between adjacent heat exchange tube layers 11. The end of the flow guiding groove 13 away from the heat exchange tube 11 is semi-circular to reduce flow resistance. A through hole 14 is formed in the middle of the reversing end 3. A threaded rod 15 is fixedly connected to the end of the replacement seat 12 near the through hole 14. The threaded rod 15 extends from the through hole 14. The threaded rod 15 extends through to the outside of the reversing end 3. One end of the threaded rod 15 is threadedly connected to a fixing nut 16. One side of the fixing nut 16 fits against one side of the reversing end 3 to fix the replacement seat 12. Sealing gaskets are provided between the fixing nut 16 and the reversing end 3 and between the replacement seat 12 and the reversing end 3 to prevent material leakage. A positioning groove 17 is provided on the side of the reversing end 3 near the housing 1. A positioning block 18 is provided at the position corresponding to the positioning groove 17 on the replacement seat 12. The positioning block 18 is detachably connected to the positioning groove 17 to prevent the replacement seat 12 from rotating.

[0028] After the screw on the back of the replacement seat 12 is inserted into the through hole 14, the replacement seat 12 can be fixed to the reversing end 3 using the fixing nut 16. The sealing gasket on the replacement seat 12 can seal the gaps and prevent sulfuric acid from leaking out. When fixing the replacement seat 12, the positioning block 18 on the replacement seat 12 can be engaged with the positioning groove 17 to prevent the replacement seat 12 from rotating, so as to ensure that the guide groove 13 on the replacement seat 12 can be aligned with the heat exchange tube 11 and ensure the flow guiding efficiency. There are multiple guide grooves 13, which are respectively aligned with the heat exchange tubes 11 of different layers. After the replacement seat 12 is installed in the reversing end 3, the sulfuric acid flowing in from the bottom heat exchange tube 11 will flow along the arc of one end of the guide groove 13 to the other end, and finally enter the upper heat exchange tube 11, so that the sulfuric acid flows more smoothly when reversing.

[0029] In this embodiment, as a preferred option, a plurality of guide plates 19 are fixedly connected to the inner wall of the cooling chamber 4 to adjust the flow direction of the liquid in the cooling chamber 4, and the heat exchange tube 11 passes through the guide plates 19. A plurality of extension plates 20 are fixedly connected to the outer surface of the heat exchange tube 11 to increase the contact area with the liquid in the cooling chamber 4.

[0030] Each of the guide plates 19 has an opening on one side, and the openings of adjacent guide plates 19 are in opposite directions, so that the cooling water in the cooling chamber 4 can flow in an S-shape along the guide plates 19, thereby making the cooling water more fully contacted with the heat exchange tubes 11 and improving the utilization rate of the cooling water. The extension plate 20 can increase the contact area between the heat exchange tubes 11 and the cooling water, making the heat exchange more efficient.

[0031] In this embodiment, as a preferred option, the bottom of the housing 1 is provided with a support base 21, and a rib plate is fixedly connected to the middle of the support base 21 to improve its strength.

[0032] In this invention, the working steps of the device are as follows:

[0033] 1. Install the replacement seat 12 inside the reversing end 3, use the fixing nut 16 to fix the position of the replacement seat 12, ensure that the positioning block 18 on the replacement seat 12 is aligned with the positioning groove 17 on the reversing end 3, and seal the joint with a sealing gasket.

[0034] 2. After installation, install the device in the required location, connect the inlet 9, outlet 8, water inlet 6 and drain 5 to the corresponding pipes, and simultaneously introduce sulfuric acid and cooling water into them.

[0035] The specific embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A feedwater heater for sulfuric acid heat recovery, characterized in that: Includes a housing (1) and a feed end (2) and a reversing end (3) fixedly connected to both ends of the housing (1). A cooling chamber (4) is provided inside the housing (1). A drain outlet (5) and a water inlet (6) are provided at the top and bottom of the housing (1), respectively. Both the drain outlet (5) and the water inlet (6) are connected to the interior of the cooling chamber (4). Baffles (7) are fixedly connected to both sides of the housing (1) to close the cooling chamber (4). The top and bottom of the feed end (2) are respectively provided with an outlet (8) and a feed inlet (9). A partition (10) is fixedly connected to the inner wall of the feed end (2). One end of the partition (10) is sealed to the baffle (7). Multiple heat exchange tubes (11) are connected through the middle of the baffle (7). The feed inlet (9) and the outlet (8) are both connected to the inside of the heat exchange tubes (11). The inside of the reversing end (3) is provided with a flow guiding mechanism to guide the sulfuric acid entering the reversing end (3).

2. The feedwater heater for sulfuric acid heat recovery according to claim 1, characterized in that: The flow guiding mechanism includes a replacement seat (12) and a flow guiding groove (13) opened inside the replacement seat (12). The replacement seat (12) is detachably connected to the inner wall of the reversing end (3). The number of flow guiding grooves (13) is matched with the number of heat exchange tubes (11) to reduce turbulence between adjacent heat exchange tubes (11).

3. A feedwater heater for sulfuric acid heat recovery according to claim 2, characterized in that: The end of the guide groove (13) away from the heat exchange tube (11) is semi-circular to reduce flow resistance.

4. A feedwater heater for sulfuric acid heat recovery according to claim 3, characterized in that: The reversing end (3) has a through hole (14) in the middle. The replacement seat (12) is fixedly connected to a threaded rod (15) at one end near the through hole (14). The threaded rod (15) passes through the through hole (14) to the outside of the reversing end (3). A fixing nut (16) is threaded to one end of the threaded rod (15). One side of the fixing nut (16) fits against one side of the reversing end (3) to fix the replacement seat (12). Sealing gaskets are provided between the fixing nut (16) and the reversing end (3) and between the replacement seat (12) and the reversing end (3) to prevent raw material leakage.

5. A feedwater heater for sulfuric acid heat recovery according to claim 4, characterized in that: The reversing end (3) has a positioning groove (17) on the side near the housing (1). The replacement seat (12) has a positioning block (18) at the position corresponding to the positioning groove (17). The positioning block (18) is detachably connected to the positioning groove (17) to prevent the replacement seat (12) from rotating.

6. A feedwater heater for sulfuric acid heat recovery according to any one of claims 1-5, characterized in that: The inner wall of the cooling chamber (4) is fixedly connected with multiple guide plates (19) to adjust the liquid flow direction in the cooling chamber (4), and the heat exchange tube (11) passes through the guide plates (19).

7. A feedwater heater for sulfuric acid heat recovery according to claim 6, characterized in that: The outer surface of the heat exchange tube (11) is fixedly connected with multiple extension plates (20) to increase the contact area with the liquid in the cooling chamber (4).

8. A feedwater heater for sulfuric acid heat recovery according to any one of claims 1-5, characterized in that: The bottom of the housing (1) is provided with a support base (21), and a rib plate is fixedly connected to the middle of the support base (21) to improve its strength.

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