Spiral steam conduction oil heat exchange device

Abstract

The invention discloses a spiral steam conduction oil heat exchange device. A heat exchange shell comprises an oil inlet cavity, an oil outlet cavity and a heat exchange cavity arranged between the oil inlet cavity and the oil outlet cavity, and the heat exchange cavity is independent of the oil inlet cavity and the oil outlet cavity; the oil inlet cavity and the oil outlet cavity are provided with a heat conduction oil inlet and a heat conduction oil outlet respectively, a steam inlet and a steam outlet are formed in the two ends, in the reverse flow direction of heat conduction oil, of the heat exchange cavity respectively, the threaded heat exchange pipe comprises a heat exchange section located in the heat exchange cavity and an oil inlet section and an oil outlet section which are communicated with the two ends of the heat exchange section, and a spiral groove is formed in the outer surface of the heat exchange section. A spiral protrusion is correspondingly formed on the inner surface of the heat exchange section, the oil inlet section and the oil outlet section extend out of the heat exchange cavity and communicate with the oil inlet cavity and the oil outlet cavity correspondingly, heat transfer is enhanced by disturbing a heat conduction oil boundary layer through the spiral protrusion and the spiral groove, and meanwhile the spiral groove located in the outer surface of the heat exchange section is used for increasing the steam side heat exchange coefficient. Therefore, a traditional boiler system can be replaced, safety is remarkably improved, maintenance cost is reduced, and the service life of heat conduction oil is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and particularly to a spiral steam heat-conducting oil heat exchange device. Background Art

[0002] Currently, the heat-conducting oil heat medium system in the anode forming workshop of electrolytic aluminum is heated and operated by the high-temperature flue gas of a calcining rotary kiln. This system uses an organic heat carrier boiler or a gas boiler to heat the heat-conducting oil and then conveys it through pipelines. After temperature regulation and pressure regulation, it supplies heat or insulation to equipment and pipelines in different areas respectively. This heat-conducting oil system has certain safety operation risks. Due to many welds and flange seals, and the low open flash point of the heat-conducting oil, it is easy to leak and cause fires or flash explosions. Moreover, the system has a large capacity, a long start-stop cycle, and is difficult to maintain, with potential safety hazards during long-term operation. At the same time, the maintenance cost of this system is high, and the annual maintenance cost for the heat-conducting oil system is high; the pipelines need to be inspected every three years, and may need partial or full replacement, facing the risk of long-term production stoppage, which is a common pain point and technical bottleneck in the carbon industry. Summary of the Invention

[0003] The purpose of the present invention is to provide a spiral steam heat-conducting oil heat exchange device to solve the problems existing in the above-mentioned prior art. By respectively providing spiral protrusions and spiral grooves on the inner and outer surfaces of the threaded heat exchange tube, the boundary layer of the heat-conducting oil is disturbed to enhance heat transfer. At the same time, the spiral grooves located on the outer surface of the heat exchange section are used to increase the heat transfer coefficient on the steam side. Furthermore, it can replace the traditional boiler system, significantly improve safety, reduce maintenance costs, and extend the service life of the heat-conducting oil, meeting the high-efficiency heating requirements of the anode forming workshop of electrolytic aluminum.

[0004] To achieve the above purpose, the present invention provides the following solution: The present invention provides a spiral steam heat-conducting oil heat exchange device, including a heat exchange housing and a plurality of threaded heat exchange tubes all arranged inside the heat exchange housing;

[0005] The heat exchange housing includes an oil inlet chamber, an oil outlet chamber, and a heat exchange chamber arranged between the oil inlet chamber and the oil outlet chamber. The heat exchange chamber is independent of the oil inlet chamber and the oil outlet chamber; the oil inlet chamber and the oil outlet chamber are respectively provided with a heat-conducting oil inlet and a heat-conducting oil outlet, and the heat-conducting oil inlet and the heat-conducting oil outlet are respectively used for the input and output of the heat-conducting oil; both ends of the heat exchange chamber along the countercurrent direction of the heat-conducting oil are respectively provided with a steam inlet and a steam outlet, and the steam inlet and the steam outlet are respectively used for the input and output of steam;

[0006] The threaded heat exchange tube includes a heat exchange section located inside the heat exchange chamber and an oil inlet section and an oil outlet section communicated with both ends of the heat exchange section. The outer surface of the heat exchange section is provided with spiral grooves, and spiral protrusions are correspondingly formed on the inner surface of the heat exchange section. The oil inlet section and the oil outlet section both extend out of the heat exchange chamber body and are respectively communicated with the oil inlet chamber and the oil outlet chamber.

[0007] Preferably, the depth of the spiral groove is 1 mm, and the height of the spiral protrusion is 1 mm.

[0008] Preferably, the pitch of the spiral groove and the spiral protrusion is 9 mm.

[0009] Preferably, the heat exchange chamber is separated from the oil inlet chamber and the oil outlet chamber by tube sheets, and each oil inlet section seals through one tube sheet, and each oil outlet section seals through the other tube sheet.

[0010] Preferably, the two tube sheets are both arrayed with mounting holes for the oil inlet section and the oil outlet section to pass through respectively, and the oil inlet section and the oil outlet section are both sealed and welded with the corresponding mounting holes.

[0011] Preferably, the heat exchange chamber and the heat exchange section are both in a straight cylindrical structure and both extend in the horizontal direction, and each heat exchange section is evenly arrayed in the heat exchange chamber, and there is a gap for the steam to pass through between two adjacent heat exchange sections.

[0012] Preferably, the outer diameter of the heat exchange tube is 19 mm, the wall thickness is 2 mm, and the center distance between two adjacent heat exchange tubes is 25 mm.

[0013] Preferably, a plurality of baffle plates are provided at equal intervals along the extending direction of the heat exchange chamber, and each baffle plate is staggered, and through holes for the heat exchange section to pass through are formed in the baffle plates.

[0014] Preferably, a plurality of tie rods are connected between the two tube sheets, each tie rod passes through each baffle plate, a spacer tube is abutted between two adjacent baffle plates, and the spacer tube is sleeved on the tie rod.

[0015] Preferably, the steam inlet is opened at the top position of the heat exchange chamber, and the steam outlet is opened at the bottom position of the heat exchange chamber.

[0016] The present invention has achieved the following technical effects compared with the prior art:

[0017] The spiral steam heat-conducting oil heat exchange device disclosed by the present invention can conduct heat exchange between steam and heat-conducting oil. Compared with the traditional heat-conducting oil system, steam heating has higher safety, can significantly reduce the risks of fire and explosion; in addition, steam heating simplifies the system structure, reduces the equipment maintenance cost, prolongs the service life of the equipment, and meets the current national requirements for environmental protection and sustainable development. Therefore, replacing the original boiler with the steam heat-conducting oil heat exchange device not only helps to eliminate or reduce potential safety hazards, avoid unpredictable accidents and property losses, but also can reduce the later system maintenance cost and improve the overall operation efficiency.

[0018] Furthermore, the additional turbulence of the heat transfer oil is mainly formed near the inner wall surface of the threaded heat exchange tube, and the pulsation of the heat transfer oil also mainly propagates near the inner wall surface of the threaded heat exchange tube. This agitates the boundary layer, making the boundary layer thinner, which is beneficial to increasing the heat transfer effect, and has less impact on the mainstream. Moreover, when the agitation effect of the previous spiral groove (spiral protrusion) on the boundary layer weakens, the existence of the next spiral groove (spiral protrusion) agitates the boundary layer again. Therefore, the entire threaded heat exchange tube not only has sufficient agitation effect on the boundary layer, but also makes the increase in the power consumption of the circulating oil pump relatively small, thus achieving the best heat exchange efficiency. Furthermore, the outside of the threaded heat exchange tube is steam, and the spiral grooves on the outer surface of the heat exchange section increase the heat transfer coefficient on the steam side, which is beneficial to the heat absorption and temperature rise of the inner heat transfer oil. Therefore, for the heat transfer oil in the spiral steam-heat transfer-oil heat exchange device disclosed in the present invention, due to the existence of the spiral grooves and spiral protrusions, the boundary layer of the heat transfer oil in the threaded heat exchange tube is disturbed, thereby reducing the thermal resistance, increasing the heat transfer amount, preventing the coking of the heat transfer oil, prolonging the service life of the heat transfer oil, and achieving the dual effects of enhancing heat transfer and preventing coking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 is a schematic diagram of the overall structure in an embodiment of the present invention;

[0021] Figure 2 is Figure 1 a sectional view of;

[0022] Figure 3 is a schematic diagram of a partial structure at the tube sheet in an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of the arrangement of the threaded heat exchange tubes in an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of the structure of the tie rod and the spacer tube in an embodiment of the present invention;

[0025] Wherein, 1 - heat exchange housing, 2 - oil inlet chamber, 3 - oil outlet chamber, 4 - heat exchange chamber, 5 - heat transfer oil inlet, 6 - heat transfer oil outlet, 7 - steam inlet, 8 - steam outlet, 9 - threaded heat exchange tube, 10 - baffle plate, 11 - tie rod, 12 - tube sheet, 13 - spacer tube. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0027] The object of the present invention is to provide a spiral steam heat transfer oil heat exchange device to solve the problems existing in the above-mentioned prior art. By respectively arranging spiral protrusions and spiral grooves on the inner and outer surfaces of the threaded heat exchange tube, the boundary layer of the heat transfer oil is disturbed to strengthen heat transfer. At the same time, the heat resistance is reduced by the phase change heat release of the steam, so as to be able to replace the traditional boiler system, significantly improve safety, reduce maintenance costs, and extend the service life of the heat transfer oil, and is suitable for the high-efficiency heating requirements of the electrolytic aluminum anode forming workshop.

[0028] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] As Figures 1 to 5 shown, this embodiment provides a spiral steam heat transfer oil heat exchange device, which includes a heat exchange housing 1 and a plurality of threaded heat exchange tubes 9 all arranged in the heat exchange housing 1; the heat exchange housing 1 includes an oil inlet chamber 2, an oil outlet chamber 3, and a heat exchange chamber 4 arranged between the oil inlet chamber 2 and the oil outlet chamber 3, and the heat exchange chamber 4 is independent of the oil inlet chamber 2 and the oil outlet chamber 3; the oil inlet chamber 2 and the oil outlet chamber 3 are respectively provided with a heat transfer oil inlet 5 and a heat transfer oil outlet 6, and the heat transfer oil inlet 5 and the heat transfer oil outlet 6 are respectively used for the input and output of the heat transfer oil. The pressure of the heat transfer oil inlet 5 is 0.4 Mpa and the temperature is 235 °C, and the pressure of the heat transfer oil outlet 6 is 0.35 Mpa and the temperature is 265 °C; at both ends of the heat exchange chamber 4 along the countercurrent direction of the heat transfer oil, a steam inlet 7 and a steam outlet 8 are respectively provided, and the steam inlet 7 and the steam outlet 8 are respectively used for the input and output of steam. The pressure of the steam inlet 7 is 3.35 Mpa and the temperature is 360 °C, and the pressure of the steam outlet 8 is 3.2 Mpa and the temperature is 240 °C; the spiral steam heat transfer oil heat exchange device disclosed in the present invention can exchange heat between steam and heat transfer oil. Compared with the traditional heat transfer oil system, steam heating has higher safety, can significantly reduce the risks of fire and explosion; in addition, steam heating simplifies the system structure, reduces the equipment maintenance cost, and extends the service life of the equipment, meeting the current national requirements for environmental protection and sustainable development. Therefore, replacing the original boiler with a steam heat transfer oil heat exchange device not only helps to eliminate or reduce potential safety hazards, avoid unpredictable accidents and property losses, but also can reduce the later system maintenance cost and improve the overall operation efficiency.

[0030] Among them, the threaded heat exchange tube 9 includes a heat exchange section located in the heat exchange cavity 4 and an oil inlet section and an oil outlet section connected to both ends of the heat exchange section. The outer surface of the heat exchange section is provided with spiral grooves, and spiral protrusions are correspondingly formed on the inner surface of the heat exchange section. Preferably, the depth of the spiral grooves is 1 mm, the height of the spiral protrusions is 1 mm, and the pitch of both the spiral grooves and the spiral protrusions is 9 mm. And preferably, the threaded heat exchange tube 9 is made by a rolling method. The oil inlet section and the oil outlet section both extend out of the heat exchange cavity 4 and are respectively connected to the oil inlet cavity 2 and the oil outlet cavity 3. Then, the additional turbulence of the heat transfer oil is mainly formed near the inner wall surface of the threaded heat exchange tube 9, and the pulsation of the heat transfer oil also mainly propagates near the inner wall surface of the threaded heat exchange tube 9. In this way, the boundary layer is agitated, making the boundary layer thinner, which is beneficial to increasing the heat transfer effect, and the influence on the mainstream is relatively small. And when the agitation effect of the previous spiral groove (spiral protrusion) on the boundary layer weakens, the existence of the next spiral groove (spiral protrusion) agitates the boundary layer again. Therefore, the entire threaded heat exchange tube 9 not only has sufficient agitation effect on the boundary layer, but also makes the increase in the power consumption of the circulating oil pump relatively small, thereby achieving the best heat exchange efficiency. Further, the outside of the threaded heat exchange tube 9 is for steam phase change heat release, with small thermal resistance and large heat transfer coefficient, while the heat transfer oil inside absorbs heat and increases in temperature, with relatively large thermal resistance and relatively small heat transfer coefficient. Therefore, the efficiency of the spiral steam heat transfer oil heat exchange device disclosed in the present invention mainly depends on the heat transfer effect of the heat transfer oil inside the threaded heat exchange tube 9. For the heat transfer oil, due to the existence of the spiral grooves and spiral protrusions, the boundary layer of the heat transfer oil in the threaded heat exchange tube 9 is disturbed, thereby reducing the thermal resistance, increasing the heat transfer amount, and preventing the heat transfer oil from coking and prolonging the service life of the heat transfer oil, achieving the dual effects of enhancing heat transfer and preventing coking.

[0031] In a specific embodiment, tube plates 12 are respectively provided between the heat exchange cavity 4 and the oil inlet cavity 2 and the oil outlet cavity 3. Each oil inlet section seals through one tube plate 12, and each oil outlet section seals through the other tube plate 12, so that the heat exchange cavity 4 is independently arranged from the oil inlet cavity 2 and the oil outlet cavity 3 through the tube plates 12, thereby avoiding the contact between the heat transfer oil and the steam and preventing the heat exchange medium from being polluted. Moreover, the oil inlet section and the oil outlet section respectively seal through the two tube plates 12 to ensure the independent arrangement of the oil inlet cavity 2, the oil outlet cavity 3 and the heat exchange cavity 4 while enabling the oil inlet section and the oil outlet section to be respectively connected to the oil inlet cavity 2 and the oil outlet cavity 3. Preferably, the two tube plates 12 are both arrayed with mounting holes for the oil inlet section and the oil outlet section to pass through respectively. The oil inlet section and the oil outlet section are both hermetically welded to the corresponding mounting holes, so as to connect the oil inlet section and the oil outlet section to the corresponding mounting holes through the welding structure and ensure the sealing fit between the oil inlet section and the oil outlet section and the corresponding mounting holes.

[0032] In a specific embodiment, the heat exchange chamber 4 and the heat exchange sections are both in a straight cylindrical structure and extend along the horizontal direction. Each heat exchange section is uniformly arranged in the heat exchange chamber 4, and there is an interval for steam to pass through between two adjacent heat exchange sections, so as to fully expand the heat exchange area of the heat exchange sections, thereby improving the heat exchange efficiency. Preferably, the outer diameter of the heat exchange tube is 19 mm and the wall thickness is 2 mm, and the center distance between two adjacent heat exchange tubes is 25 mm.

[0033] In a specific embodiment, a plurality of baffles 10 are arranged at equal intervals along the extending direction of the heat exchange chamber 4. Specifically, the baffles 10 extend along the radial direction of the heat exchange chamber 4, and the baffles 10 are staggered. Through holes for the heat exchange sections to pass through are formed in the baffles 10. By arranging the baffles 10, when the steam flows, it can be restricted by the baffles 10 and flow back and forth along the direction perpendicular to the extension of the heat exchange chamber 4, thereby improving the utilization efficiency of the heat energy of the steam. Among them, a plurality of tie rods 11 are connected between the two tube sheets 12. Preferably, the two ends of the tie rods 11 are respectively threadedly connected to the two tube sheets 12, and each tie rod 11 passes through each baffle 10. A spacer tube 13 is abutted between two adjacent baffles 10, and the spacer tube 13 is sleeved on the tie rod 11. The tie rod 11 is used to position each spacer tube 13, and the spacer tube 13 presses against the baffle 10 to ensure its shape and position remain unchanged and ensure the stability of the steam flow.

[0034] In a specific embodiment, the steam inlet 7 is opened at the top position of the heat exchange chamber 4, and the steam outlet 8 is opened at the bottom position of the heat exchange chamber 4. Since the heat energy of the steam is relatively large, opening the steam inlet 7 at the top position of the heat exchange chamber 4 enables the steam to flow from top to bottom, ensuring full contact with the threaded heat exchange tubes 9.

[0035] Adaptations made according to actual needs are all within the protection scope of the present invention.

[0036] It should be noted that for those skilled in the art, obviously the present invention is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0037] In the present invention, specific examples are used to illustrate the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A spiral steam heat transfer oil heat exchange device, characterized in that, It includes a heat exchange housing and a plurality of threaded heat exchange tubes all arranged inside the heat exchange housing; The heat exchange housing includes an oil inlet chamber, an oil outlet chamber, and a heat exchange chamber provided between the oil inlet chamber and the oil outlet chamber. The heat exchange chamber is independent of the oil inlet chamber and the oil outlet chamber; the oil inlet chamber and the oil outlet chamber are respectively provided with a heat transfer oil inlet and a heat transfer oil outlet, and the heat transfer oil inlet and the heat transfer oil outlet are respectively used for the input and output of heat transfer oil; both ends of the heat exchange chamber in the countercurrent direction of the heat transfer oil are respectively provided with a steam inlet and a steam outlet, and the steam inlet and the steam outlet are respectively used for the input and output of steam; The threaded heat exchange tube includes a heat exchange section located inside the heat exchange chamber and an oil inlet section and an oil outlet section communicated with both ends of the heat exchange section. The outer surface of the heat exchange section is provided with spiral grooves, and spiral protrusions are correspondingly formed on the inner surface of the heat exchange section. Both the oil inlet section and the oil outlet section extend out of the heat exchange cavity and are respectively communicated with the oil inlet chamber and the oil outlet chamber.

2. The spiral steam heat-conducting oil heat exchange device according to claim 1, wherein, The depth of the spiral groove is 1 mm, and the height of the spiral protrusion is 1 mm.

3. The spiral steam heat transfer oil heat exchange device according to claim 1, characterized in that, The pitch of the spiral groove and the spiral protrusion is 9 mm.

4. The spiral steam heat transfer oil heat exchange device according to any one of claims 1 to 3, characterized in that, The heat exchange chamber is separated from the oil inlet chamber and the oil outlet chamber by tube sheets respectively. Each oil inlet section is hermetically passed through one tube sheet, and each oil outlet section is hermetically passed through the other tube sheet.

5. The spiral steam heat transfer oil heat exchange device according to claim 4, characterized in that, Both of the two tube sheets are arrayed with mounting holes for the oil inlet section and the oil outlet section to pass through respectively, and the oil inlet section and the oil outlet section are hermetically welded to the corresponding mounting holes.

6. The spiral steam heat transfer oil heat exchange device according to claim 4, characterized in that Both the heat exchange chamber and the heat exchange section are in a straight cylindrical structure and extend along the horizontal direction. Each heat exchange section is evenly arrayed in the heat exchange chamber, and there is an interval for the steam to pass through between adjacent two heat exchange sections.

7. The spiral steam heat-conducting oil heat exchange device according to claim 6, characterized in that, The outer diameter of the heat exchange tube is 19 mm, the wall thickness is 2 mm, and the center distance between adjacent two heat exchange tubes is 25 mm.

8. The spiral steam heat transfer oil heat exchange device according to claim 6, characterized in that, A plurality of baffle plates are equidistantly arranged along the extending direction of the heat exchange chamber inside the heat exchange chamber. Each baffle plate is staggered, and through holes for the heat exchange section to pass through are opened on the baffle plates.

9. The spiral steam heat transfer oil heat exchange device according to claim 8, characterized in that, A plurality of tie rods are connected between the two tube sheets. Each tie rod passes through each baffle plate, and a spacer tube is abutted between adjacent two baffle plates. The spacer tube is sleeved on the tie rod.

10. The spiral steam heat transfer oil heat exchange device according to claim 6, characterized in that, The steam inlet is opened at the top position of the heat exchange chamber, and the steam outlet is opened at the bottom position of the heat exchange chamber.

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