Efficient steam-water heat exchanger

Abstract

The invention relates to the technical field of heat exchange equipment, and particularly discloses an efficient steam-water heat exchanger which comprises a reactor, a cover plate arranged at the upper end of the reactor, a through hole formed in the edge of the cover plate, a sleeve vertically arranged at the upper end of the through hole, a heating pipe slidably arranged in the sleeve and an air inlet pipe vertically arranged in the heating pipe. The exhaust pipe communicates with the upper end of the heating pipe, the cleaning device is arranged at the lower end in the sleeve, and the driving device is used for driving the heating pipe to ascend and descend; the lower end of the air inlet pipe is close to the bottom of the heating pipe, the upper end of the air inlet pipe penetrates through the upper end of the heating pipe and then is connected with a steam source, and the cleaning device is arranged between the sleeve and the heating pipe. According to the efficient steam-water heat exchanger, waste heat generated by other devices can be effectively used for heating slurry in a reactor, and corrosion to pipelines is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange equipment, and more particularly, to a high-efficiency steam-water heat exchanger. Background Art

[0002] A heat exchange system is a very common device in industrial production. It mainly utilizes the heat generated during the use of certain devices. By using this part of the heat to heat a heat-conducting medium, and then transporting the heat-conducting medium to the device that needs to be heated, so as to achieve the reuse of heat.

[0003] For example, in alumina production, steam is generated during the flash evaporation of the dilution tank. This part of the steam is usually directly discharged, which is a waste of energy. However, the decalcification of red mud needs to be carried out at a high temperature. Therefore, it is necessary to heat the red mud decalcification tank. Therefore, a heat exchange device can be set between the dilution tank and the decalcification tank to transfer the heat released by the dilution tank to the decalcification tank. However, the dilution tank and the decalcification tank are both independent devices. If the form of winding heat exchange tubes on the outer wall of the decalcification tank is adopted, then due to the relatively thick wall of the decalcification tank itself, the heat transfer efficiency is not good; if the heat exchange tubes are directly extended into the slurry in the decalcification tank, then the high-concentration alkali in the decalcification tank will cause great corrosion to the heat exchange tubes. Therefore, it is necessary to design a more reasonable heat exchange device to save energy consumption in the alumina production process. Summary of the Invention

[0004] The purpose of the present invention is to provide a high-efficiency steam-water heat exchanger, which can effectively use the waste heat generated by other devices to heat the slurry in the reactor and reduce the corrosion of the pipeline.

[0005] The present invention is realized through the following technical solutions: The high-efficiency steam-water heat exchanger of the present invention includes a reactor, a cover plate provided at the upper end of the reactor, including a through hole opened at the edge of the cover plate, a sleeve provided vertically at the upper end of the through hole, a heating tube slidably provided in the sleeve, an air inlet pipe provided vertically in the heating tube, an exhaust pipe communicated with the upper end of the heating tube, a cleaning device provided at the lower end inside the sleeve, and a driving device for driving the heating tube to lift; both ends of the heating tube are sealed ends, the lower end of the air inlet pipe is arranged close to the bottom of the heating tube, the upper end of the air inlet pipe passes through the upper end of the heating tube and is connected to a steam source, and the cleaning device is arranged between the sleeve and the heating tube.

[0006] Further, the cleaning device includes a hollow collar fixedly provided on the inner wall of the sleeve, a water spray pipe communicated with the inside of the collar, and water spray holes opened on the inner wall of the collar; the end of the water spray pipe away from the collar passes through the side wall of the sleeve and is connected to a water supply device; there is a gap between the inner wall of the collar and the outer wall of the heating tube.

[0007] Further, a U-shaped heat exchange tube is provided inside the heating tube, and both ends of the heat exchange tube pass through the upper end of the heating tube and extend upward; one end of the heat exchange tube is connected to a water inlet device, and the other end is connected to a water outlet device.

[0008] Further, connection heads are provided at both ends of the heat exchange tube above the heating tube, and a pair of the connection heads are detachably connected to the water inlet device and the water outlet device respectively.

[0009] Further, both the water inlet device and the water outlet device are provided at the upper end of the sleeve.

[0010] Further, the connection head includes a vertically arranged connecting pipe, a sealing plate arranged inside the connecting pipe, and a spring arranged below the sealing plate; the diameter of the sealing plate is larger than the diameter of the upper end opening of the connecting pipe, the diameter of the sealing plate is smaller than the inner diameter of the connecting pipe, and the lower end of the spring is fixedly connected to the inner wall of the lower end of the connecting pipe.

[0011] Further, the water inlet device includes a water inlet pipe, a water inlet hole opened on the side wall of the end of the water inlet pipe, a water inlet valve arranged on the water inlet pipe, and a water source connected to the water inlet pipe; the end of the water inlet pipe away from the water source is vertically arranged directly above the connecting pipe, and the outer diameter of the water inlet pipe is equal to the diameter of the upper end opening of the connecting pipe; the water outlet device includes a water outlet pipe, a water outlet valve arranged on the water outlet pipe, and a water outlet hole opened at the end of the water outlet pipe; the end of the water outlet pipe is vertically arranged directly above the connecting pipe, the outer diameter of the water outlet pipe is equal to the outer diameter of the water inlet pipe, and both the water inlet valve and the water outlet valve are fixedly connected to the outer wall of the sleeve.

[0012] Further, limiting rings are arranged on the side walls of both the water inlet pipe and the water outlet pipe, and the limiting rings are abutted against the upper end of the connecting pipe.

[0013] Further, a connecting ring is provided at the upper end of the heating tube, and the connecting ring is slidably connected to the inner wall of the sleeve; the driving device includes a pair of pulling ropes respectively arranged on opposite sides of the connecting ring, and a pair of the pulling ropes are both connected to a lifting device.

[0014] Further, a pair of horizontally arranged hanging rings are provided at the upper end of the sleeve, one of the hanging rings is arranged directly above one of the pulling ropes, and one of the pulling ropes passes through one of the hanging rings.

[0015] The technical solution of the present invention has at least the following advantages and beneficial effects: For the high-efficiency steam-water heat exchanger of the present invention, when in use, other devices that can generate high-temperature steam can be used as the steam source. The generated waste high-temperature steam is sent into the bottom of the heating pipe through the intake pipe. The high-temperature steam moves upward from bottom to top in the heating pipe and is discharged from the exhaust pipe above. During this process, the high-temperature steam can fully heat the heating pipe. The heating pipe is lowered by the driving device so that the heating pipe extends into the slurry inside the reactor through the through hole of the cover plate to heat the slurry. In this way, the heat generated by other devices can be fully utilized to heat the slurry inside the reactor, effectively utilizing thermal energy. And when the heating is completed, the driving device is used to lift the heating pipe. During the lifting process, the outer wall of the heating pipe can be rinsed by the cleaning device to avoid the slurry adhering to the surface of the heating pipe for a long time, prevent the heating pipe from being corroded, and improve the service life of the heating pipe. In addition, since both the sleeve and the heating pipe are arranged at the edge of the cover plate, when the heating pipe extends into the reactor, it will be closer to the edge of the reactor, so that it will not affect the original stirring device of the reactor, enabling stirring and heating to be carried out simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of a state of the high-efficiency steam-water heat exchanger provided by an embodiment of the present invention;

[0017] Figure 2 It is a schematic structural diagram of a second state of the high-efficiency steam-water heat exchanger provided by an embodiment of the present invention;

[0018] Figure 3 It is a schematic internal structural diagram of the high-efficiency steam-water heat exchanger provided by an embodiment of the present invention;

[0019] Figure 4 It is a schematic structural diagram of the heating pipe part provided by an embodiment of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the heat exchange pipe part provided by an embodiment of the present invention;

[0021] Figure 6 It is a schematic internal structural diagram of the heating pipe provided by an embodiment of the present invention;

[0022] Figure 7 It is a schematic structural diagram of the water inlet device part provided by an embodiment of the present invention;

[0023] Figure 8 It is a schematic structural diagram of the cleaning device part provided by an embodiment of the present invention;

[0024] Figure 9 It is a schematic internal structural diagram of the connector provided by an embodiment of the present invention;

[0025] Figure 10 Schematic diagram of the structure of the connecting ring part provided by the embodiment of the present invention.

[0026] Icons: 11 - cover plate, 12 - stirring device, 20 - sleeve, 21 - heating pipe, 22 - intake pipe, 23 - exhaust pipe, 24 - connecting ring, 25 - pull rope, 30 - cleaning device, 31 - collar, 32 - water spraying pipe, 33 - water spraying holes, 41 - heat exchange pipe, 42 - water inlet device, 421 - water inlet pipe, 422 - water inlet valve, 423 - water inlet holes, 424 - limiting ring, 43 - water outlet device, 431 - water outlet pipe, 432 - water outlet valve, 433 - water outlet holes, 44 - connector, 441 - connecting pipe, 442 - sealing plate, 443 - spring. Detailed implementation manners

[0027] Embodiment

[0028] The following is further described in conjunction with specific embodiments. As shown in the attached Figure 1 - attached Figure 10 figure (only the structure of the cover plate 11 is shown in the attached figure to represent the relative position relationship between the cover plate 11 and the sleeve 20), the high-efficiency steam-water heat exchanger of this embodiment includes a reactor, a cover plate 11 provided at the upper end of the reactor, including through holes opened at the edge of the cover plate 11, a sleeve 20 vertically provided at the upper end of the through holes, a heating pipe 21 slidably provided in the sleeve 20, an intake pipe 22 vertically provided in the heating pipe 21, an exhaust pipe communicated with the upper end of the heating pipe 21, a cleaning device 30 provided at the lower end inside the sleeve 20, and a driving device for driving the lifting of the heating pipe 21; both ends of the heating pipe 21 are sealed ends, the lower end of the intake pipe 22 is arranged close to the bottom of the heating pipe 21, the upper end of the intake pipe 22 passes through the upper end of the heating pipe 21 and is connected to a steam source, and the cleaning device 30 is arranged between the sleeve 20 and the heating pipe 21. Specifically, when in use, other devices capable of generating high-temperature steam can be used as the steam source, and the generated waste high-temperature steam is sent into the bottom of the heating pipe 21 through the intake pipe 22. The high-temperature steam moves upward from bottom to top in the heating pipe 21 and is discharged from the upper exhaust pipe. During this process, the high-temperature steam can fully heat the heating pipe 21. The heating pipe 21 is lowered by the driving device so that the heating pipe 21 extends into the slurry inside the reactor after passing through the through hole of the cover plate 11 (as shown in the attached Figure 2 figure), heating the slurry, which can make full use of the heat generated by other devices to heat the slurry inside the reactor, can effectively utilize heat energy, and when the heating is completed, the driving device is used to lift the heating pipe 21 (as shown in the attached Figure 1As shown in the figure, during the lifting process, the outer wall of the heating tube 21 can be rinsed by the cleaning device 30, which can prevent the slurry from adhering to the surface of the heating tube 21 for a long time, avoid the corrosion of the heating tube 21, and improve the service life of the heating tube 21. In addition, since both the sleeve 20 and the heating tube 21 are arranged at the edge of the cover plate 11, after the heating tube 21 extends into the reactor, it will be closer to the edge of the reactor, thus not affecting the original stirring device 12 of the reactor, enabling stirring and heating to be carried out simultaneously.

[0029] The cleaning device 30 in this embodiment includes a hollow collar 31 fixedly arranged on the inner wall of the sleeve 20, a water spraying pipe 32 communicating with the inside of the collar 31, and water spraying holes 33 opened on the inner wall of the collar 31; one end of the water spraying pipe 32 far from the collar 31 passes through the side wall of the sleeve 20 and is connected to a water supply device; there is a gap between the inner wall of the collar 31 and the outer wall of the heating tube 21. Specifically, when it is necessary to clean the outer wall of the heating tube 21, the cleaning liquid can be pumped into the collar 31 through the water spraying pipe 32 by using the water supply device, and sprayed on the surface of the heating tube 21 through the water spraying holes 33 on the inner wall of the collar 31, and flow down along the wall surface of the heating tube 21 to wash away the slurry on the wall surface of the heating tube 21. It should be noted that the type of the cleaning liquid is preferably the one already contained in the slurry.

[0030] A U-shaped heat exchange tube 41 is arranged inside the heating tube 21 in this embodiment, and both ends of the heat exchange tube 41 pass through the upper end of the heating tube 21 and extend upward; one end of the heat exchange tube 41 is connected to a water inlet device 42, and the other end is connected to a water outlet device 43. Specifically, the purpose of arranging the heat exchange tube 41 inside the heating tube 21 is that when the heating tube 21 does not heat the slurry, high-temperature steam can be used to heat the water (or other heat-conducting media) in the heat exchange tube 41 to make full use of the heat.

[0031] Connection heads 44 are arranged at both ends of the heat exchange tube 41 above the heating tube 21 in this embodiment, and a pair of connection heads 44 are detachably connected to the water inlet device 42 and the water outlet device 43 respectively. The water inlet device 42 and the water outlet device 43 are both arranged at the upper end of the sleeve 20. Specifically, in the form of detachable connection, when the heating tube 21 moves downward and extends into the reactor, the heat exchange tube 41 is disconnected from the water inlet device 42 and the water outlet device 43. At this time, the water in the heat exchange tube 41 does not circulate; when the heating tube 21 moves upward and is pulled out of the reactor, the heat exchange tube 41 is communicated with the water inlet device 42 and the water outlet device 43, and the water in the heat exchange tube 41 starts to circulate, and the high-temperature steam heats the water in the heat exchange tube 41.

[0032] The connector 44 in this embodiment includes a connecting pipe 441 arranged vertically, a sealing plate 442 disposed inside the connecting pipe 441, and a spring 443 disposed below the sealing plate 442; the diameter of the sealing plate 442 is larger than the diameter of the upper end opening of the connecting pipe 441, the diameter of the sealing plate 442 is smaller than the inner diameter of the connecting pipe 441, and the lower end of the spring 443 is fixedly connected to the inner wall of the lower end of the connecting pipe 441. The water inlet device 42 includes a water inlet pipe 421, a water inlet hole 423 opened on the side wall of the end of the water inlet pipe 421, a water inlet valve 422 arranged on the water inlet pipe 421, and a water source connected to the water inlet pipe 421; the end of the water inlet pipe 421 away from the water source is vertically arranged directly above the connecting pipe 441, and the outer diameter of the water inlet pipe 421 is equal to the diameter of the upper end opening of the connecting pipe 441; the water outlet device 43 includes a water outlet pipe 431, a water outlet valve 432 arranged on the water outlet pipe 431, and a water outlet hole 433 opened at the end of the water outlet pipe 431; the end of the water outlet pipe 431 is vertically arranged directly above the connecting pipe 441, the outer diameter of the water outlet pipe 431 is equal to the outer diameter of the water inlet pipe 421, and both the water inlet valve 422 and the water outlet valve 432 are fixedly connected to the outer wall of the sleeve 20. Specifically, when the heating pipe 21 moves up to the highest position, the water inlet pipe 421 and the water outlet pipe 431 are respectively inserted into the connecting pipe 441, pushing the sealing plate 442 downward, so that the water inlet pipe 421 and the water outlet pipe 431 are simultaneously communicated with the heat exchange pipe 41. The water in the water inlet pipe 421 enters the heat exchange pipe 41 through the water inlet hole 423, and the water in the heat exchange pipe 41 is discharged into the water outlet pipe 431 through the water outlet hole 433. Before the heating pipe 21 moves down, the water inlet valve 422 and the water outlet valve 432 are simultaneously closed, and then the heating pipe 21 moves down, and the water inlet pipe 421 and the water outlet pipe 431 are simultaneously pulled out of the connecting pipe 441. The sealing plate 442 blocks the upper end of the connecting pipe 441 under the action of the spring 443 to seal the connecting pipe 441. At this time, the heat exchange pipe 41 is separated from the outside.

[0033] Limit rings 424 are provided on the side walls of the water inlet pipe 421 and the water outlet pipe 431 in this embodiment, and the limit rings 424 are abutted against the upper end of the connecting pipe 441. Specifically, by providing the limit rings 424, it is possible to prevent the water inlet pipe 421 and the water outlet pipe 431 from being inserted into the connecting pipe 441 excessively.

[0034] A connecting ring 24 is provided at the upper end of the heating pipe 21 in this embodiment, and the connecting ring 24 is slidably connected to the inner wall of the sleeve 20; the driving device includes a pair of pull ropes 25 respectively arranged on opposite sides of the connecting ring 24, and a pair of pull ropes 25 are both connected with a lifting device. Specifically, by pulling the pull ropes 25 through the lifting device, the heating pipe 21 can be pulled up and down. Among them, the air inlet pipe 22 and the air outlet pipe 23 can be of a flexible hose structure, and the lifting device can adopt a hoist, an electric hoist, a hydraulic cylinder, a cylinder, etc.

[0035] A pair of horizontally arranged hanging rings are provided at the upper end of the sleeve 20 in this embodiment. One hanging ring is arranged directly above one drawstring 25, and one drawstring 25 is arranged to pass through one hanging ring. Specifically, the drawstring 25 located in the sleeve 20 can be restricted to always maintain a vertical state through the hanging ring.

[0036] In summary, for the high-efficiency steam-water heat exchanger of this embodiment, when in use, other devices that can generate high-temperature steam can be used as the steam source. The generated waste high-temperature steam is sent into the bottom of the heating tube 21 through the air inlet pipe 22. The high-temperature steam moves upward from bottom to top in the heating tube 21 and is discharged from the exhaust pipe above. During this process, the high-temperature steam can fully heat the heating tube 21. The heating tube 21 is lowered by the driving device, so that the heating tube 21 extends into the slurry inside the reactor after passing through the through hole of the cover plate 11 to heat the slurry. In this way, the heat generated by other devices can be fully utilized to heat the slurry inside the reactor, and the heat energy can be effectively utilized. And when the heating is completed, the driving device is used to lift the heating tube 21. During the lifting process, the outer wall of the heating tube 21 can be rinsed by the cleaning device 30 to avoid the slurry adhering to the surface of the heating tube 21 for a long time, avoid the corrosion of the heating tube 21, and improve the service life of the heating tube 21. In addition, since both the sleeve 20 and the heating tube 21 are arranged at the edge of the cover plate 11, after the heating tube 21 extends into the reactor, it will be closer to the edge of the reactor. In this way, it will not affect the original stirring device 12 of the reactor, so that stirring and heating can be carried out simultaneously.

[0037] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-efficiency steam-water heat exchanger, comprising a reactor and a cover plate (11) arranged at the upper end of the reactor, characterized in that: It comprises a through hole opened at the edge of the cover plate (11), a sleeve (20) vertically arranged at the upper end of the through hole, a heating tube (21) slidably arranged in the sleeve (20), an air inlet pipe (22) vertically arranged in the heating tube (21), an exhaust pipe connected to the upper end of the heating tube (21), a cleaning device (30) arranged at the lower end of the sleeve (20), and a driving device for driving the heating tube (21) to rise and fall; Both ends of the heating tube (21) are sealed ends, the lower end of the air inlet pipe (22) is arranged close to the bottom of the heating tube (21), the upper end of the air inlet pipe (22) passes through the upper end of the heating tube (21) and is connected to a steam source, and the cleaning device (30) is arranged between the sleeve (20) and the heating tube (21).

2. The high-efficiency steam-water heat exchanger according to claim 1 is characterized in that: The cleaning device (30) comprises a hollow collar (31) fixedly mounted on the inner wall of the sleeve (20), a water spray pipe (32) connected to the inside of the collar (31), and a water spray hole (33) opened on the inner wall of the collar (31); One end of the water spray pipe (32) away from the sleeve (31) passes through the side wall of the sleeve (20) and is connected to the water supply device; a gap is provided between the inner wall of the sleeve (31) and the outer wall of the heating pipe (21).

3. The high-efficiency steam-water heat exchanger according to claim 1 is characterized in that: A U-shaped heat exchange tube (41) is provided inside the heating tube (21), and both ends of the heat exchange tube (41) pass through the upper end of the heating tube (21) and extend upward; one end of the heat exchange tube (41) is connected to a water inlet device (42), and the other end is connected to a water outlet device (43).

4. The high-efficiency steam-water heat exchanger according to claim 3 is characterized in that: The heat exchange tube (41) is provided with connecting heads (44) at both ends above the heating tube (21), and a pair of the connecting heads (44) are detachably connected to the water inlet device (42) and the water outlet device (43) respectively.

5. The high-efficiency steam-water heat exchanger according to claim 4 is characterized in that: The water inlet device (42) and the water outlet device (43) are both arranged at the upper end of the sleeve (20).

6. The high-efficiency steam-water heat exchanger according to claim 5 is characterized in that: The connecting head (44) comprises a vertically arranged connecting pipe (441), a sealing plate (442) arranged inside the connecting pipe (441), and a spring (443) arranged at the lower side of the sealing plate (442); The diameter of the sealing plate (442) is larger than the diameter of the upper opening of the connecting tube (441), and the diameter of the sealing plate (442) is smaller than the inner diameter of the connecting tube (441). The lower end of the spring (443) is fixedly connected to the inner wall of the lower end of the connecting tube (441).

7. The high-efficiency steam-water heat exchanger according to claim 6, characterized in that: The water inlet device (42) comprises a water inlet pipe (421), a water inlet hole (423) provided on the side wall of the end of the water inlet pipe (421), a water inlet valve (422) provided on the water inlet pipe (421), and a water source connected to the water inlet pipe (421); one end of the water inlet pipe (421) away from the water source is vertically provided directly above the connecting pipe (441), and the outer diameter of the water inlet pipe (421) is equal to the diameter of the upper opening of the connecting pipe (441); The water outlet device (43) comprises a water outlet pipe (431), a water outlet valve (432) arranged on the water outlet pipe (431), and a water outlet hole (433) opened at the end of the water outlet pipe (431); the end of the water outlet pipe (431) is vertically arranged directly above the connecting pipe (441); the outer diameter of the water outlet pipe (431) is equal to the outer diameter of the water inlet pipe (421); and the water inlet valve (422) and the water outlet valve (432) are both fixedly connected to the outer wall of the sleeve (20).

8. The high-efficiency steam-water heat exchanger according to claim 7 is characterized in that: The side walls of the water inlet pipe (421) and the water outlet pipe (431) are both provided with limiting rings (424), and the limiting rings (424) are in abutment with the upper end of the connecting pipe (441).

9. The high-efficiency steam-water heat exchanger according to claim 1 is characterized in that: The upper end of the heating tube (21) is provided with a connecting ring (24), and the connecting ring (24) is slidably connected to the inner wall of the sleeve (20); The driving device comprises a pair of pull ropes (25) respectively arranged on opposite sides of the connecting ring (24), and the pair of pull ropes (25) are both connected to a lifting device.

10. The high-efficiency steam-water heat exchanger according to claim 9, characterized in that: A pair of horizontally arranged hanging rings are provided at the upper end of the sleeve (20), one of the hanging rings is arranged directly above one of the pull ropes (25), and one of the pull ropes (25) passes through one of the hanging rings.

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