Double-cylinder shell-and-tube heat exchanger and heat exchanger use method

Abstract

The application provides a double-cylinder shell-and-tube heat exchanger and a heat exchanger use method. The double-cylinder shell-and-tube heat exchanger comprises an inner cylinder, a first end cover, a second end cover and a first outer cylinder. The inner cylinder comprises a shell side outlet and a shell side inlet. The first end cover is installed at one end of the inner cylinder and comprises a tube side inlet. The second end cover is installed at the other end of the inner cylinder and comprises a tube side outlet. The first outer cylinder is installed outside the inner cylinder and surrounds the inner cylinder. The first outer cylinder forms a first heat dissipation cavity and comprises a first heat dissipation inlet and a first heat dissipation outlet. The first heat dissipation inlet and the first heat dissipation outlet are communicated with the first heat dissipation cavity. Liquid is introduced into the first heat dissipation cavity. On one hand, the liquid can dissipate heat from the inner cylinder, thereby reducing the temperature resistance requirement of the material of the inner cylinder. On the other hand, the liquid and the first outer cylinder can play a certain heat insulation role. The double-cylinder shell-and-tube heat exchanger can reduce the production cost while being heat insulated.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchangers, in particular to a double-cylinder tube-shell heat exchanger and a heat exchanger use method. BACKGROUND

[0002] The tube-shell heat exchanger is a commonly used heat exchange equipment, which is widely used in various industries. In the tube-shell heat exchanger, two fluids for heat exchange, one flowing in the tube, called tube-side fluid, and the other flowing outside the tube, called shell-side fluid.

[0003] Compared with other heat exchange equipment, the tube-shell heat exchanger has many advantages such as high heat transfer efficiency, high temperature and pressure resistance, compact structure, small floor area, etc. When the fluid is high-temperature gas (≥600℃), part of the heat will be transferred to the outer surface of the tube-shell heat exchanger, making the outer surface temperature higher. Therefore, in the prior art, under the condition that the shell-side fluid is high-temperature gas, a heat insulation layer (such as thermal insulation cotton, heat insulation plate, vacuum cavity, foamed aluminum, etc.) is usually selected to cover the outer surface of the cylinder and the head to avoid scalding accidents.

[0004] In the design of the tube-shell heat exchanger, in order to be able to withstand high-temperature gas, the materials of the cylinder and the head need to be selected from better temperature-resistant materials, which are often limited in selection and expensive. Although the heat insulation layer plays a role in preventing scalding, it also makes it difficult for the heat of the cylinder and the head to dissipate, which puts higher requirements on the temperature resistance of the cylinder and the head, which further limits the selection of materials for the tube-shell heat exchanger and increases the design cost. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a double-cylinder tube-shell heat exchanger and a heat exchanger use method, which can reduce the production cost while insulating.

[0006] The double-cylinder tube-shell heat exchanger provided by the present application comprises an inner cylinder, a first head, a second head and a first outer cylinder, the inner cylinder comprises a shell-side outlet and a shell-side inlet, the first head is installed at one end of the inner cylinder, the first head comprises a tube-side inlet, the second head is installed at the other end of the inner cylinder, the second head comprises a tube-side outlet, the first outer cylinder is installed outside the inner cylinder, the first outer cylinder surrounds the inner cylinder, the first outer cylinder forms a first heat dissipation cavity, the first outer cylinder comprises a first heat dissipation inlet and a first heat dissipation outlet, and the first heat dissipation inlet and the first heat dissipation outlet communicate with the first heat dissipation cavity.

[0007] According to the double-cylinder shell-and-tube heat exchanger provided in the application, at least the following technical effects are achieved: the first outer cylinder is additionally arranged, so that the double-cylinder shell-and-tube heat exchanger forms a first heat dissipation cavity, and liquid is introduced into the first heat dissipation cavity; on one hand, the liquid dissipates heat from the inner cylinder through heat exchange, so that the surface temperature of the inner cylinder is reduced, and the temperature resistance requirement of the inner cylinder in material selection is reduced; on the other hand, the liquid and the wall surface of the first outer cylinder can also play a certain heat insulation role while the liquid carries away heat, so that the double-cylinder shell-and-tube heat exchanger can reduce the production cost while insulating heat.

[0008] According to some embodiments of the application, the first heat dissipation cavity is provided with a baffle, and the baffle is used to generate turbulent flow.

[0009] According to some embodiments of the application, the first heat dissipation inlet is communicated with the tube-side inlet, and the first heat dissipation outlet is communicated with the tube-side outlet.

[0010] According to some embodiments of the application, the double-cylinder shell-and-tube heat exchanger comprises a first regulating valve and a second regulating valve, the first regulating valve is arranged between the first heat dissipation inlet and the tube-side inlet, and the second regulating valve is arranged between the first heat dissipation outlet and the tube-side outlet.

[0011] According to some embodiments of the application, the double-cylinder shell-and-tube heat exchanger comprises a second outer cylinder, the second outer cylinder is arranged outside the first head, the second outer cylinder surrounds the first head, the second outer cylinder forms a second heat dissipation cavity, and the second outer cylinder comprises a second heat dissipation inlet and a second heat dissipation outlet, and the second heat dissipation inlet and the second heat dissipation outlet are communicated with the second heat dissipation cavity.

[0012] According to some embodiments of the application, the double-cylinder shell-and-tube heat exchanger comprises a third outer cylinder, the third outer cylinder is arranged outside the second head, the third outer cylinder surrounds the second head, the third outer cylinder forms a third heat dissipation cavity, and the third outer cylinder comprises a third heat dissipation inlet and a third heat dissipation outlet, and the third heat dissipation inlet and the third heat dissipation outlet are communicated with the third heat dissipation cavity.

[0013] According to some embodiments of the application, the double-cylinder shell-and-tube heat exchanger comprises a first switching valve and a second switching valve, an inlet end of the first switching valve is used to communicate with a water inlet pipe, one outlet end of the first switching valve is communicated with the first heat dissipation inlet, and the other outlet end of the first switching valve is communicated with the second heat dissipation inlet and the third heat dissipation inlet, one inlet end of the second switching valve is communicated with the first heat dissipation outlet, the other inlet end of the second switching valve is communicated with the second heat dissipation outlet and the third heat dissipation outlet, and an outlet end of the second switching valve is used to communicate with a water outlet pipe.

[0014] According to some embodiments of the present application, the double-cylinder shell-and-tube heat exchanger comprises lugs mounted on the outer side of the inner cylinder, and a plurality of the first outer cylinders are arranged along the axial direction of the inner cylinder, and the lugs are located between adjacent first outer cylinders.

[0015] According to the heat exchanger use method provided by the present application, the double-cylinder shell-and-tube heat exchanger provided by the present application is used, and the heat exchanger use method comprises the following steps:

[0016] The high-temperature gas flows in the shell side, and the low-temperature liquid flows in the tube side, the first regulating valve and the second regulating valve are opened to make the low-temperature liquid flow through the first heat dissipation cavity;

[0017] In response to the temperature difference of the outlet water of the tube side outlet and the first heat dissipation outlet, the opening degrees of the first regulating valve and the second regulating valve are controlled to keep the outlet water temperatures of the tube side outlet and the first heat dissipation outlet consistent.

[0018] According to the heat exchanger use method provided by the present application, at least the following technical effects are achieved: first, the low-temperature liquid in the first heat dissipation cavity dissipates heat for the inner cylinder and plays a heat insulation role, which reduces the temperature resistance requirement of the inner cylinder material and reduces the manufacturing cost of the double-cylinder shell-and-tube heat exchanger, second, the tube side and the first heat dissipation cavity share the low-temperature liquid, and the low-temperature liquid in the first heat dissipation cavity is mixed with the low-temperature liquid in the tube side after heat absorption, so that the waste heat of the low-temperature liquid in the first heat dissipation cavity can be recovered in the subsequent process, and finally, the outlet water temperatures of the tube side outlet and the first heat dissipation outlet are kept consistent, which takes into account the heat exchange effect and the heat dissipation effect while avoiding temperature sudden change at the intersection.

[0019] According to the heat exchanger use method provided by the present application, the double-cylinder shell-and-tube heat exchanger provided by the present application is used, and the heat exchanger use method comprises the following steps:

[0020] In response to the working condition that the high-temperature gas flows in the shell side and the low-temperature fluid flows in the tube side, the first switching valve and the second switching valve are controlled to make the water inlet pipe communicate with the first heat dissipation inlet, and the drain pipe communicate with the first heat dissipation outlet;

[0021] In response to the working condition that the high-temperature gas flows in the tube side and the low-temperature fluid flows in the shell side, the first switching valve and the second switching valve are controlled to make the water inlet pipe communicate with the second heat dissipation inlet and the third heat dissipation inlet, and the drain pipe communicate with the second heat dissipation outlet and the third heat dissipation outlet.

[0022] According to the heat exchanger use method provided in the application, at least the following technical effects are achieved: by controlling the first switch valve and the second switch valve, in the working condition of passing high-temperature gas in the shell side, the liquid in the first heat dissipation cavity dissipates heat to the inner cylinder and plays a heat insulation role, reducing the temperature resistance requirement of the inner cylinder when selecting materials, in the working condition of passing high-temperature gas in the tube side, the liquid in the second heat dissipation cavity dissipates heat to the first head, the liquid in the third heat dissipation cavity dissipates heat to the second head, and plays a heat insulation role, reducing the temperature resistance requirement of the first head and the second head when selecting materials, the heat exchanger use method can reduce the manufacturing cost of the double-cylinder tube-shell heat exchanger, and enrich the application scenarios of the double-cylinder tube-shell heat exchanger. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the description of the embodiments, taken in conjunction with the following drawings in which:

[0024] Figure 1 is a structural schematic diagram of a double-cylinder tube-shell heat exchanger of an embodiment of the present application;

[0025] Figure 2 is a structural schematic diagram of a double-cylinder tube-shell heat exchanger of another embodiment of the present application;

[0026] Figure 3 is a structural schematic diagram of a double-cylinder tube-shell heat exchanger of still another embodiment of the present application;

[0027] Figure 4 is a pipeline connection schematic diagram of the embodiment of Figure 3 .

[0028] REFERENCE NUMERALS:

[0029] inner cylinder 110, shell side inlet 111, shell side outlet 112, first head 120, tube side inlet 121, second head 130, tube side outlet 131, lug 140,

[0030] first outer cylinder 210, first heat dissipation inlet 211, first heat dissipation outlet 212, second outer cylinder 220, second heat dissipation inlet 221, second heat dissipation outlet 222, third outer cylinder 230, third heat dissipation inlet 231, third heat dissipation outlet 232,

[0031] first regulating valve 310, second regulating valve 320, first switch valve 330, second switch valve 340, water inlet pipe 350, water outlet pipe 360. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described below in detail with reference to the accompanying drawings, wherein the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout the drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and cannot be understood as a limitation on the present application.

[0033] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the purpose of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0035] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0036] Referring to Figure 1 , the double-cylinder shell heat exchanger provided by the present application comprises an inner cylinder 110, a first end cover 120, a second end cover 130 and a first outer cylinder 210. The inner cylinder 110 comprises a shell side outlet 112 and a shell side inlet 111. The first end cover 120 is installed at one end of the inner cylinder 110, and the first end cover 120 comprises a tube side inlet 121. The second end cover 130 is installed at the other end of the inner cylinder 110, and the second end cover 130 comprises a tube side outlet 131. The first outer cylinder 210 is installed outside the inner cylinder 110, and the first outer cylinder 210 surrounds the inner cylinder 110. The first outer cylinder 210 forms a first heat dissipation cavity, and the first outer cylinder 210 comprises a first heat dissipation inlet 211 and a first heat dissipation outlet 212. The first heat dissipation inlet 211 and the first heat dissipation outlet 212 communicate with the first heat dissipation cavity. Figure 1 In the description of the present application, the inner cylinder 110 surrounded by the first outer cylinder 210 is indicated by a dashed line.

[0037] It can be understood that the basic structure of the shell-and-tube heat exchanger belongs to the prior art, the inner cylinder 110, the first end cover 120 and the second end cover 130 form a heat exchange cavity, the heat exchange cavity is provided with heat exchange tubes, the heat exchange tubes are connected with the tube inlet 121 and the tube outlet 131, and the heat exchange cavity is connected with the shell inlet 111 and the shell outlet 112. When heat exchange is performed, one kind of fluid flows in the heat exchange cavity, that is, the shell fluid, and the other kind of fluid flows in the heat exchange tube, that is, the tube fluid.

[0038] The shell-and-tube heat exchanger in the prior art only realizes heat insulation and anti-burning by the heat insulation layer wrapped on the outer surface. According to the double-cylinder shell-and-tube heat exchanger provided in the application, the first outer cylinder 210 is additionally arranged, so that the double-cylinder shell-and-tube heat exchanger forms a first heat dissipation cavity. Liquid is introduced into the first heat dissipation cavity. On the one hand, the liquid is heat exchanged with the inner cylinder 110 to dissipate heat, so as to reduce the surface temperature of the inner cylinder 110 and further reduce the temperature resistance requirement of the inner cylinder 110 when the material is selected. On the other hand, the liquid and the wall surface of the first outer cylinder 210 can also play a certain heat insulation effect while taking away heat. The double-cylinder shell-and-tube heat exchanger can reduce the production cost while insulating heat.

[0039] Here, the first outer cylinder 210 forms the first heat dissipation cavity. The gap between the inner wall of the first outer cylinder 210 and the outer wall of the inner cylinder 110 can form the first heat dissipation cavity. The first outer cylinder 210 can be a hollow structure, and the inside of the first outer cylinder 210 can form the first heat dissipation cavity. The heat exchange tube arranged in the first outer cylinder 210 can form the first heat dissipation cavity. The specific way can be determined according to the size of the double-cylinder shell-and-tube heat exchanger and other factors.

[0040] After heat dissipation and heat insulation, if the outer surface temperature of the first outer cylinder 210 is still relatively high, the double-cylinder shell-and-tube heat exchanger can wrap a heat insulation layer on the outer surface to improve the heat insulation effect. Since the liquid in the first heat dissipation cavity continuously flows to take away heat, the outer surface temperature of the first outer cylinder 210 will be significantly lower than that of the conventional shell-and-tube heat exchanger. The performance parameters of the heat insulation layer are reduced, for example, the thickness of the thermal insulation cotton can be reduced, so that the cost of the heat insulation layer is correspondingly reduced. At this time, the temperature of the inner cylinder 110 will not be difficult to dissipate due to the wrapping of the heat insulation layer.

[0041] In order to improve the heat dissipation effect of the first heat dissipation cavity, a baffle is arranged in the first heat dissipation cavity in some embodiments. The baffle is used to generate turbulent flow. The turbulent flow makes the liquid in the first heat dissipation cavity fully heat exchanged with the wall surface of the inner cylinder 110, so as to improve the heat exchange efficiency. The baffle here can be a spiral plate, a baffle plate, a fin or the like.

[0042] According to some embodiments of the present application, the first heat dissipation inlet 211 is in communication with the tube-side inlet 121, and the first heat dissipation outlet 212 is in communication with the tube-side outlet 131. At this time, the first heat dissipation cavity is in parallel connection with the heat exchange tube, and the liquid in the first heat dissipation cavity can be combined with the liquid in the heat exchange tube, so as to perform subsequent waste heat recovery, improve the energy utilization rate, and reduce the complexity of the pipeline.

[0043] With reference to Figure 2 In some embodiments, the double-cylinder shell-and-tube heat exchanger comprises a first regulating valve 310 and a second regulating valve 320, the first regulating valve 310 is arranged between the first heat dissipation inlet 211 and the tube-side inlet 121, and the second regulating valve 320 is arranged between the first heat dissipation outlet 212 and the tube-side outlet 131. The first regulating valve 310 and the second regulating valve 320 are used to control the flow distribution, and the heat exchange effect of the heat exchange tube and the heat dissipation effect of the first heat dissipation cavity are taken into account.

[0044] The foregoing double-cylinder shell-and-tube heat exchanger embodiments are applied to the working condition of passing high-temperature gas in the shell side. In the working condition of passing high-temperature gas in the tube side and low-temperature fluid in the shell side, the surface temperature of the inner cylinder 110 is relatively low, and basically no heat insulation is needed. However, at this time, the first head 120 and the second head 130 are in contact with the heat exchange tube, and the surface temperature is relatively high, and especially the first head 120 provided with the tube-side inlet 121 is prone to scalding accidents.

[0045] Therefore, with reference to Figure 3 According to some embodiments of the present application, the double-cylinder shell-and-tube heat exchanger comprises a second outer cylinder 220, the second outer cylinder 220 is installed on the outer side of the first head 120, the second outer cylinder 220 surrounds the first head 120, the second outer cylinder 220 forms a second heat dissipation cavity, and the second outer cylinder 220 comprises a second heat dissipation inlet 221 and a second heat dissipation outlet 222, which are in communication with the second heat dissipation cavity. The double-cylinder shell-and-tube heat exchanger can dissipate heat for the first head 120 through the second outer cylinder 220, which reduces the requirement for the temperature resistance performance of the material selected for the first head 120 while achieving the effect of heat insulation and preventing scalding. The addition of the second outer cylinder 220 enriches the applicable working conditions of the double-cylinder shell-and-tube heat exchanger.

[0046] In some embodiments, the double-cylinder shell-and-tube heat exchanger comprises a third outer cylinder 230, the third outer cylinder 230 is installed on the outer side of the second head 130, the third outer cylinder 230 surrounds the second head 130, the third outer cylinder 230 forms a third heat dissipation cavity, and the third outer cylinder 230 comprises a third heat dissipation inlet 231 and a third heat dissipation outlet 232, which are in communication with the third heat dissipation cavity. The second outer cylinder 220 and the third outer cylinder 230 jointly dissipate heat, making the double-cylinder shell-and-tube heat exchanger more suitable for the working condition of passing high-temperature gas in the tube side.

[0047] Further referring to Figure 4 In some embodiments, the double-cylinder shell-and-tube heat exchanger comprises a first switching valve 330 and a second switching valve 340. An inlet end of the first switching valve 330 is connected to the water inlet pipe 350. One outlet end of the first switching valve 330 is connected to the first heat dissipation inlet 211. Another outlet end of the first switching valve 330 is connected to the second heat dissipation inlet 221 and the third heat dissipation inlet 231. One inlet end of the second switching valve 340 is connected to the first heat dissipation outlet 212. Another inlet end of the second switching valve 340 is connected to the second heat dissipation outlet 222 and the third heat dissipation outlet 232. An outlet end of the second switching valve 340 is connected to the water outlet pipe 360. The flow direction of the liquid can be switched by the first switching valve 330 and the second switching valve 340. In the working condition of passing high-temperature gas in the shell side, the first outer cylinder 210 is used for heat dissipation. In the working condition of passing high-temperature gas in the tube side, the second outer cylinder 220 and the third outer cylinder 230 are used for heat dissipation. The water flow rate of the water inlet pipe 350 is reduced to save resources while ensuring the heat dissipation effect.

[0048] The actual shell-and-tube heat exchanger is provided with structures such as lugs 140 and legs for support. Referring to Figure 2 and Figure 3 In some embodiments, the double-cylinder shell-and-tube heat exchanger comprises lugs 140. The lugs 140 are installed on the outer side of the inner cylinder 110. A plurality of first outer cylinders 210 are arranged along the axial direction of the inner cylinder 110, and the lugs 140 are located between adjacent first outer cylinders 210. In this way, the first outer cylinders 210 and the lugs 140 do not interfere with each other, facilitating the assembly of the double-cylinder shell-and-tube heat exchanger.

[0049] According to the heat exchanger use method provided by the present application, the double-cylinder shell-and-tube heat exchanger provided by the present application is used. The heat exchanger use method comprises the following steps:

[0050] In the shell side, high-temperature gas passes through. In the tube side, low-temperature liquid passes through. The first regulating valve 310 and the second regulating valve 320 are opened to make the low-temperature liquid flow through the first heat dissipation cavity.

[0051] In response to the temperature difference of the water outlet of the tube side outlet 131 and the first heat dissipation outlet 212, the opening degree of the first regulating valve 310 and the second regulating valve 320 is controlled to keep the water outlet temperature of the tube side outlet 131 and the first heat dissipation outlet 212 consistent.

[0052] According to the heat exchanger use method provided in the present application, firstly, the low-temperature liquid in the first heat dissipation cavity dissipates heat for the inner cylinder 110 and plays a heat insulation role, which reduces the temperature resistance requirement of the inner cylinder 110 when selecting materials and reduces the manufacturing cost of the double-cylinder shell-and-tube heat exchanger. Secondly, the tube and the first heat dissipation cavity share the low-temperature liquid, and the low-temperature liquid in the first heat dissipation cavity is mixed with the low-temperature liquid in the tube after absorbing heat, so that the waste heat of the low-temperature liquid in the first heat dissipation cavity can be recovered in the subsequent process. Finally, the outlet water temperature of the tube outlet and the first heat dissipation outlet is consistent, which takes into account the heat exchange effect and the heat dissipation effect while avoiding sudden temperature changes at the intersection.

[0053] According to another heat exchanger use method provided in the present application, the double-cylinder shell-and-tube heat exchanger provided in the present application is used, and the heat exchanger use method comprises the following steps:

[0054] In response to the working condition that the shell passes high-temperature gas and the tube passes low-temperature fluid, the first switching valve 330 and the second switching valve 340 are controlled to make the water inlet pipe 350 communicate with the first heat dissipation inlet 211, and the drain pipe 360 communicate with the first heat dissipation outlet 212.

[0055] In response to the working condition that the tube passes high-temperature gas and the shell passes low-temperature fluid, the first switching valve 330 and the second switching valve 340 are controlled to make the water inlet pipe 350 communicate with the second heat dissipation inlet 221 and the third heat dissipation inlet 231, and the drain pipe 360 communicate with the second heat dissipation outlet 222 and the third heat dissipation outlet 232.

[0056] According to the heat exchanger use method provided in the present application, by controlling the first switching valve 330 and the second switching valve 340, in the working condition that the shell passes high-temperature gas, the liquid in the first heat dissipation cavity dissipates heat for the inner cylinder and plays a heat insulation role, which reduces the temperature resistance requirement of the inner cylinder 110 when selecting materials. In the working condition that the tube passes high-temperature gas, the liquid in the second heat dissipation cavity dissipates heat for the first head 120, and the liquid in the third heat dissipation cavity dissipates heat for the second head 130 and plays a heat insulation role, which reduces the temperature resistance requirement of the first head 120 and the second head 130 when selecting materials. The heat exchanger use method can reduce the manufacturing cost of the double-cylinder shell-and-tube heat exchanger and enrich the application scenarios of the double-cylinder shell-and-tube heat exchanger.

[0057] The double-cylinder shell-and-tube heat exchanger and the heat exchanger use method provided in the present application are described in detail below with two specific embodiments. It should be understood that the following description is only exemplary and not a specific limitation of the present application. The specific embodiments can also be replaced by the above-mentioned corresponding technical features or combined with the above-mentioned technical features.

[0058] Embodiment 1:

[0059] Reference Figure 2The double-cylinder shell-and-tube heat exchanger comprises an inner cylinder 110, a first head 120, a second head 130, an ear 140, and a first outer cylinder 210. The inner cylinder 110 comprises a shell-side outlet 112 and a shell-side inlet 111, the shell-side outlet 112 is below the shell-side inlet 111, the first head 120 is installed at the lower end of the inner cylinder 110, the first head 120 comprises a tube-side inlet 121, the second head 130 is installed at the upper end of the inner cylinder 110, the second head 130 comprises a tube-side outlet 131, and the ear 140 is installed on the outer side of the inner cylinder 110.

[0060] The first outer cylinder 210 is installed on the outer side of the inner cylinder 110, two first outer cylinders 210 are respectively located on both sides of the ear 140, the first outer cylinder 210 surrounds the inner cylinder 110, the first outer cylinder 210 forms a first heat dissipation cavity, a baffle is arranged in the first heat dissipation cavity, the first outer cylinder 210 comprises a first heat dissipation inlet 211 and a first heat dissipation outlet 212, the first heat dissipation inlet 211 and the first heat dissipation outlet 212 are in communication with the first heat dissipation cavity. The first heat dissipation inlet 211 is in communication with the tube-side inlet 121 through a first regulating valve 310, and the first heat dissipation outlet 212 is in communication with the tube-side outlet 131 through a second regulating valve 320. The first heat dissipation outlet 212 is above the first heat dissipation inlet 211, that is, the liquid flow direction of the first heat dissipation cavity is opposite to the liquid flow direction of the shell side.

[0061] The double-cylinder shell-and-tube heat exchanger adopts the following heat exchanger use method:

[0062] The high-temperature gas flows through the shell side, the low-temperature liquid flows through the tube side, and the first regulating valve 310 and the second regulating valve 320 are opened to make the low-temperature liquid flow through the first heat dissipation cavity;

[0063] In response to the temperature difference of the water outlet of the tube-side outlet 131 and the first heat dissipation outlet 212, the opening degrees of the first regulating valve 310 and the second regulating valve 320 are controlled to keep the temperature of the water outlet of the tube-side outlet 131 and the first heat dissipation outlet 212 consistent.

[0064] Embodiment 2:

[0065] Reference Figure 3 and Figure 4The difference between Example 2 and Example 1 is that the double-cylinder shell heat exchanger further comprises a second outer cylinder 220 and a third outer cylinder 230. The second outer cylinder 220 is installed outside the first head 120, the second outer cylinder 220 surrounds the first head 120, the second outer cylinder 220 forms a second heat dissipation cavity, the second outer cylinder 220 comprises a second heat dissipation inlet 221 and a second heat dissipation outlet 222, and the second heat dissipation inlet 221 and the second heat dissipation outlet 222 are in communication with the second heat dissipation cavity. The third outer cylinder 230 is installed outside the second head 130, the third outer cylinder 230 surrounds the second head 130, the third outer cylinder 230 forms a third heat dissipation cavity, the third outer cylinder 230 comprises a third heat dissipation inlet 231 and a third heat dissipation outlet 232, and the third heat dissipation inlet 231 and the third heat dissipation outlet 232 are in communication with the third heat dissipation cavity.

[0066] The double-cylinder shell heat exchanger comprises a first switching valve 330 and a second switching valve 340. An inlet end of the first switching valve 330 is connected to the water inlet pipe 350, one outlet end of the first switching valve 330 is connected to the first heat dissipation inlet 211, and the other outlet end of the first switching valve 330 is connected to the second heat dissipation inlet 221 and the third heat dissipation inlet 231. One inlet end of the second switching valve 340 is connected to the first heat dissipation outlet 212, and the other inlet end of the second switching valve 340 is connected to the second heat dissipation outlet 222 and the third heat dissipation outlet 232. An outlet end of the second switching valve 340 is connected to the water outlet pipe 360.

[0067] In the method for using the heat exchanger of Example 2, in response to the working condition that high-temperature gas flows through the shell side and low-temperature fluid flows through the tube side, the first switching valve 330 and the second switching valve 340 are controlled to connect the water inlet pipe 350 to the first heat dissipation inlet 211 and connect the water outlet pipe 360 to the first heat dissipation outlet 212. In response to the working condition that high-temperature gas flows through the tube side and low-temperature fluid flows through the shell side, the first switching valve 330 and the second switching valve 340 are controlled to connect the water inlet pipe 350 to the second heat dissipation inlet 221 and the third heat dissipation inlet 231, and connect the water outlet pipe 360 to the second heat dissipation outlet 222 and the third heat dissipation outlet 232.

[0068] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] While the embodiments of the application have been shown and described, it is to be understood that the embodiments can be varied, modified, substituted and changed by those skilled in the art without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A double-barrelled shell-and-tube heat exchanger, characterised in that, The double-cylinder shell-and-tube heat exchanger comprises: an inner cylinder comprising a shell-side outlet and a shell-side inlet; a first head mounted at one end of the inner cylinder, the first head comprising a tube-side inlet; a second head mounted at the other end of the inner cylinder, the second head comprising a tube-side outlet; a first outer cylinder mounted outside the inner cylinder, the first outer cylinder surrounding the inner cylinder, the first outer cylinder forming a first heat dissipation cavity, the first outer cylinder comprising a first heat dissipation inlet and a first heat dissipation outlet, the first heat dissipation inlet and the first heat dissipation outlet being in communication with the first heat dissipation cavity; the inner cylinder, the first head and the second head forming a heat exchange cavity, the heat exchange cavity containing heat exchange tubes, the heat exchange tubes being in communication with the tube-side inlet and the tube-side outlet, the heat exchange cavity being in communication with the shell-side inlet and the shell-side outlet; the first heat dissipation inlet being in communication with the tube-side inlet, the first heat dissipation outlet being in communication with the tube-side outlet, the first heat dissipation cavity being in parallel with the heat exchange tubes, liquid in the first heat dissipation cavity being able to mix with liquid in the heat exchange tubes; a second outer cylinder mounted outside the first head, the second outer cylinder surrounding the first head, the second outer cylinder forming a second heat dissipation cavity, the second outer cylinder comprising a second heat dissipation inlet and a second heat dissipation outlet, the second heat dissipation inlet and the second heat dissipation outlet being in communication with the second heat dissipation cavity.

2. The double-barrelled shell-and-tube heat exchanger according to claim 1, characterized in that: A baffle is arranged in the first heat dissipation cavity, the baffle being used to generate turbulent flow.

3. The double-barrelled shell-and-tube heat exchanger according to claim 1, characterized in that: The double-cylinder shell-and-tube heat exchanger comprises a first regulating valve and a second regulating valve, the first regulating valve being arranged between the first heat dissipation inlet and the tube-side inlet, the second regulating valve being arranged between the first heat dissipation outlet and the tube-side outlet.

4. The double-barrelled shell-and-tube heat exchanger according to claim 1, characterized in that: The double-cylinder shell-and-tube heat exchanger comprises a third outer cylinder mounted outside the second head, the third outer cylinder surrounding the second head, the third outer cylinder forming a third heat dissipation cavity, the third outer cylinder comprising a third heat dissipation inlet and a third heat dissipation outlet, the third heat dissipation inlet and the third heat dissipation outlet being in communication with the third heat dissipation cavity.

5. The double-barrelled shell-and-tube heat exchanger according to claim 4, characterized in that: The double-cylinder shell-and-tube heat exchanger comprises a first switching valve and a second switching valve, an inlet end of the first switching valve being used to communicate with a water inlet pipe, one outlet end of the first switching valve being in communication with the first heat dissipation inlet, the other outlet end of the first switching valve being in communication with the second heat dissipation inlet and the third heat dissipation inlet, one inlet end of the second switching valve being in communication with the first heat dissipation outlet, the other inlet end of the second switching valve being in communication with the second heat dissipation outlet and the third heat dissipation outlet, an outlet end of the second switching valve being used to communicate with a water outlet pipe.

6. The double-barrelled shell-and-tube heat exchanger according to claim 1, characterized in that: The double-cylinder shell-and-tube heat exchanger comprises an ear mounted outside the inner cylinder, a plurality of the first outer cylinders being arranged along the axial direction of the inner cylinder, the ear being located between adjacent first outer cylinders.

7. A method of using a heat exchanger, the method comprising: The heat exchanger using method uses the double-cylinder shell-and-tube heat exchanger according to claim 3, the heat exchanger using method comprising the following steps: The high-temperature gas flows through the shell side, and the low-temperature liquid flows through the tube side, and the first regulating valve and the second regulating valve are opened to make the low-temperature liquid flow through the first heat dissipation cavity; In response to the temperature difference of the outlet water of the tube side outlet and the first heat dissipation outlet, the opening degrees of the first regulating valve and the second regulating valve are controlled to keep the outlet water temperature of the tube side outlet and the first heat dissipation outlet consistent.

8. A method of using a heat exchanger, the method comprising: The heat exchanger using method uses the double-cylinder tube-shell heat exchanger according to claim 5, and the heat exchanger using method comprises the following steps: In response to the working condition that the high-temperature gas flows through the shell side and the low-temperature fluid flows through the tube side, the first switching valve and the second switching valve are controlled to make the water inlet pipe communicate with the first heat dissipation inlet, and the drain pipe communicate with the first heat dissipation outlet; In response to the working condition that the high-temperature gas flows through the tube side and the low-temperature fluid flows through the shell side, the first switching valve and the second switching valve are controlled to make the water inlet pipe communicate with the second heat dissipation inlet and the third heat dissipation inlet, and the drain pipe communicate with the second heat dissipation outlet and the third heat dissipation outlet.

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