Heat exchange device and steam generation system

Abstract

The present application relates to heat exchange equipment field, disclose a kind of heat exchange device and steam generating system.The heat exchange device includes tank body, first heat exchange component and second heat exchange component, and the inside of tank body is formed with heat exchange cavity;First heat exchange component is arranged in heat exchange cavity, and fluid passage is formed in first heat exchange component;Second heat exchange component is arranged on the inner wall of tank body, and the second heat exchange component is provided with spoiler, and gas passage is formed in the inside of second heat exchange component.Based on the heat exchange device provided in the application can effectively reduce the shell side pressure in the preheating section heat exchanger, so that the diameter of shell side can be enlarged, wall thickness can be reduced, reduce cost, while reducing the safety risk of equipment, and the spoiler is arranged on the second heat exchange component, improve the trend of medium turbulent flow, increase the shell side convection heat transfer coefficient, so that the size of tank body is greatly reduced by changing the structure, and then the overall equipment size is reduced, the floor area is reduced, the economy and practicality of overall equipment are improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment, and more specifically to a heat exchange device and a steam generation system. Background Technology

[0002] With the transformation of the global energy structure and the increasing demands for environmental protection, the oilfield development sector is facing unprecedented challenges and opportunities. In response, the electrothermal molten salt energy storage steam injection test station has emerged, marking a significant breakthrough in the application of electrothermal molten salt energy storage technology in oilfield development.

[0003] This experimental station innovatively utilizes off-peak electricity from the power grid to heat molten salt, efficiently converting electrical energy into heat energy and storing it in the liquid molten salt. Subsequently, through a continuous heat exchange process between the high-temperature molten salt and softened water, a large amount of steam is generated, providing a stable steam supply to surrounding heavy oil thermal recovery wells. Statistics show that the experimental station has an energy storage capacity of 15 megawatts, an annual steam production of up to 48,000 tons, which can replace 3.13 million cubic meters of natural gas and significantly reduce carbon dioxide emissions by 6,768 tons. This achievement not only provides strong support for carbon emission reduction in the process of heavy oil thermal recovery in old oilfields, but also lays a solid foundation for the comprehensive promotion and application of electrothermal molten salt energy storage technology.

[0004] The experimental station has achieved significant results in terms of technology and environmental protection; however, some problems have also been exposed during actual operation. The station employs a steam extraction preheating process, utilizing direct-flow steam generated by the evaporator to return to the preheating evaporator for preheating the produced water. This design effectively prevents molten salt solidification caused by direct contact between the low-temperature produced water and the molten salt, but it also introduces the problem of overload design. Specifically, the designed quantities of molten salt and steam exceed the actual steam injection requirements. As the energy storage scale further expands, the size of the molten salt storage tank and steam generator will increase dramatically to accommodate system pressure, which not only increases manufacturing costs but also reduces the system's economy and practicality. Furthermore, during operation, the steam generator exhibits low heat transfer efficiency due to the slow flow of molten salt. Summary of the Invention

[0005] To address the technical problems of current steam generators, such as large size, high manufacturing cost, poor economy and practicality, and low heat transfer efficiency, this invention provides a heat exchange device and a steam generation system.

[0006] This invention provides a heat exchange device, comprising:

[0007] The tank body has a heat exchange cavity inside, and the tank body is provided with a medium inlet and a medium outlet that communicate with the heat exchange cavity;

[0008] A first heat exchange component is disposed within the heat exchange cavity. A fluid channel is formed within the first heat exchange component, and the first heat exchange component is provided with a fluid inlet and a fluid outlet communicating with the fluid channel.

[0009] The second heat exchange component is disposed on the inner wall of the tank. The second heat exchange component is provided with a turbulence part and is configured such that the medium flowing into the heat exchange cavity can change its flow path under the action of the turbulence part.

[0010] The second heat exchange component has a gas channel inside, and the second heat exchange component is provided with a gas inlet and a gas outlet that communicate with the gas channel.

[0011] Optionally, the first heat exchange assembly includes a first heat exchange pipe, which is bent and extended, and the fluid inlet and the fluid outlet are located at both ends of the first heat exchange pipe, and both the fluid inlet and the fluid outlet are disposed on the tank body.

[0012] Optionally, the first heat exchange pipe includes at least two parallel extending pipe bodies, with the two ends of the multiple pipe bodies connected by an inlet pipe box and an outlet pipe box, respectively. The fluid inlet is located on the inlet pipe box, and the fluid outlet is located on the outlet pipe box.

[0013] Optionally, the second heat exchange assembly includes multiple C-shaped tubes disposed on the inner wall of the tank. The multiple C-shaped tubes are spaced apart along the circumferential direction of the tank, and the ends of two adjacent C-shaped tubes are connected by a bend, so that the gas passage formed by the multiple C-shaped tubes is bent and extended.

[0014] Optionally, the flow-disrupting part includes a plurality of fins evenly distributed on a plurality of C-shaped tubes, wherein the plurality of fins on each C-shaped tube are spaced apart along the extension direction of the C-shaped tube.

[0015] Optionally, the C-shaped tube extends along the axial direction of the tank.

[0016] Optionally, the fins extend along the radial direction of the tank body.

[0017] Optionally, the medium inlet is located at the top of the tank, and the medium outlet is located at the bottom of the tank.

[0018] The present invention also provides a steam generating system, comprising:

[0019] A heat exchange device, including a preheating heat exchanger, a heating heat exchanger and an evaporating heat exchanger, wherein the heating heat exchanger and / or the evaporating heat exchanger employ the heat exchange device described above.

[0020] The medium conveying equipment includes a medium conveying device and a medium recovery device. The medium conveyed by the medium conveying device flows sequentially through the shell side of the evaporator heat exchanger and the heating heat exchanger and then flows back to the medium recovery device.

[0021] A fluid transport device includes a fluid transport apparatus, wherein the fluid transported by the fluid transport apparatus flows sequentially through the tube side of the preheating heat exchanger, the heating heat exchanger and the evaporating heat exchanger and flows out through the fluid outlet of the evaporating heat exchanger;

[0022] Wherein, the gas outlet of the heating heat exchanger and / or the evaporating heat exchanger is connected to the gas inlet of the preheating heat exchanger, and the gas outlet of the preheating heat exchanger is connected to the gas inlet of the heating heat exchanger and / or the evaporating heat exchanger.

[0023] Optionally, the medium conveying equipment conveys molten salt, the medium conveying device is a high-temperature molten salt storage tank, and the medium recovery device is a low-temperature molten salt storage tank.

[0024] Optionally, the ratio of the diameter to the height of the high-temperature molten salt storage tank is greater than 1.2;

[0025] And / or, the ratio of the diameter to the height of the cryogenic molten salt storage tank is greater than 1.2.

[0026] Optionally, a salt-dissolving tank for heating the molten salt is provided on the circulation pipeline between the high-temperature molten salt storage tank and the low-temperature molten salt storage tank.

[0027] Optionally, the fluid transported by the fluid transport device is produced water.

[0028] Optionally, the diameter of the tube side of the preheating heat exchanger, the heating heat exchanger, and the evaporating heat exchanger is greater than dn65.

[0029] Optionally, the shell side of the preheating heat exchanger, the heating heat exchanger, and the evaporating heat exchanger are connected in series, and the preheating heat exchanger, the heating heat exchanger, and the evaporating heat exchanger are supported by a bracket.

[0030] Optionally, the preheating heat exchanger, the heating heat exchanger, and the evaporating heat exchanger are arranged in a triangular pattern on the support.

[0031] Optionally, the fluid delivery device further includes an electric heater for preheating the outflowing fluid.

[0032] Optionally, the electric heater includes an electric heating rod.

[0033] Optionally, the medium conveying device is provided with a first solar panel for providing electrical energy to the electric heater.

[0034] Optionally, the medium recovery device is provided with a second solar panel for providing power to the electric heater.

[0035] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0036] Based on the heat exchange device provided by this invention, high-temperature hot air is generated by exchanging heat between compressed gas and the high-temperature medium in the heat exchange chamber through the introduction of compressed gas into the second heat exchange component. The high-temperature hot air then enters the subsequent preheating section heat exchanger for heat exchange, effectively reducing the shell-side pressure in the preheating section heat exchanger. This allows for an increase in the shell-side diameter and a reduction in the wall thickness, thereby reducing costs and safety risks. Furthermore, a turbulence-inducing part is provided on the second heat exchange component to turbulentize the flowing medium, increasing the tendency of turbulent flow and the shell-side convective heat transfer coefficient. Thus, without affecting the shutdown and salt discharge of the tank, the size of the tank itself is significantly reduced by changing the structural form, thereby reducing the overall equipment size, reducing the floor space, and improving the overall economy and practicality of the equipment. Attached Figure Description

[0037] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0039] Figure 1 This is a cross-sectional view of the heat exchange device according to an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the connection method of the first heat exchange pipe of the heat exchange device according to an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of the steam generation system according to an embodiment of the present invention;

[0042] Figure 4 This is a front view of the heat exchange device according to an embodiment of the present invention;

[0043] Figure 5 This is a side view of the heat exchange device according to an embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures

[0045] 1. Tank body; 11. Heat exchange chamber; 2. First heat exchange assembly; 21. First heat exchange pipe; 211. Pipe body; 212. Inlet pipe box; 213. Outlet pipe box; 3. Second heat exchange assembly; 31. Turbulence section; 311. Fins; 32. Gas passage; 33. C-shaped tube; 4. Heat exchange equipment; 41. Preheating heat exchanger; 42. Heating heat exchanger; 43. Evaporating heat exchanger; 5. Medium conveying equipment; 51. Medium conveying device; 511. High-temperature molten salt storage tank; 512. First solar panel; 52. Medium recovery device; 521. Low-temperature molten salt storage tank; 522. Second solar panel; 6. Fluid conveying equipment; 61. Fluid conveying device; 7. Support; 8. Electric heater; 81. Electric heating rod; 9. Salt dissolving tank. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments and features of the present invention can be combined with each other.

[0047] The following description sets forth many specific details in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments described in the specification are only some, not all, of the embodiments of the invention.

[0048] Combination Figure 1 and Figure 2 As shown, the heat exchange device provided in the embodiment of the present invention includes a tank 1, a first heat exchange component 2, and a second heat exchange component 3.

[0049] The tank body 1 has a heat exchange chamber 11 inside, and the tank body 1 is provided with a medium inlet and a medium outlet that communicate with the heat exchange chamber 11. The medium can enter the heat exchange chamber 11 through the medium inlet and then flow out through the medium outlet. At this time, the medium flows through the shell side, where the medium can be molten salt, that is, the molten salt flows through the shell side of the tank body 1, avoiding pipe blockage caused by flowing through the tube side, and ensuring the use effect of the tank body 1.

[0050] The first heat exchange component 2 is disposed within the heat exchange chamber 11. A fluid channel is formed within the first heat exchange component 2, wherein the fluid channel extends in a zigzag pattern to increase the fluid flow path and ensure heat exchange efficiency. The first heat exchange component 2 is provided with a fluid inlet and a fluid outlet communicating with the fluid channel. Fluid can enter the fluid channel through the fluid inlet and then flow out through the fluid outlet, allowing the fluid to travel through the tubes. The fluid here can be treated produced water, meaning the produced water travels through the tubes within the heat exchange device. The fluid in the fluid channel exchanges heat with the medium within the heat exchange chamber 11.

[0051] The second heat exchange component 3 is disposed on the inner wall of the tank 1. The placement of the second heat exchange component 3 is unrestricted and can be achieved through welding, etc. The second heat exchange component 3 is provided with a turbulence-inducing part 31, which is located on the side of the second heat exchange component 3 facing the axis of the tank 1, allowing the medium flowing through the heat exchange chamber 11 to contact the turbulence-inducing part 31. The medium flowing into the heat exchange chamber 11 can change its flow path under the action of the turbulence-inducing part 31, thereby increasing the tendency of medium turbulence and increasing the shell-side convective heat transfer coefficient. This allows for a significant reduction in the size of the heat exchange device by changing its structural form without affecting the shutdown and salt discharge of the heat exchange device. The second heat exchange component 3 has a gas channel 32 formed inside, with a gas inlet and a gas outlet communicating with the gas channel 32. Gas can enter the gas channel 32 through the gas inlet and then flow to the target location through the gas outlet to provide high-temperature gas to the target. The gas in the gas channel 32 exchanges heat with the medium in the heat exchange chamber 11.

[0052] Based on the heat exchange device provided by this invention, high-temperature hot air is generated by exchanging heat between compressed gas and the high-temperature medium in the heat exchange chamber 11 through the introduction of compressed gas into the second heat exchange component 3. The high-temperature hot air then enters the subsequent preheating section heat exchanger for heat exchange, effectively reducing the shell-side pressure in the preheating section heat exchanger. This allows for an increase in the shell-side diameter and a reduction in the wall thickness, thereby reducing costs and safety risks. Furthermore, a turbulence-inducing part 31 is provided on the second heat exchange component 3 to turbulentize the flowing medium, increasing the tendency of turbulent flow and the shell-side convective heat transfer coefficient. Thus, without affecting the shutdown and salt discharge of the tank 1, the size of the tank 1 itself is significantly reduced by changing the structural form, thereby reducing the overall equipment size, reducing the floor space, improving the overall economy and practicality of the equipment, and reducing energy consumption and emissions to meet the growing energy demands and environmental protection requirements of the oilfield development field.

[0053] In some embodiments, the first heat exchange assembly 2 includes a first heat exchange pipe 21, which is bent and extended to increase the flow path of the fluid and ensure the heat exchange effect of the fluid. The fluid inlet and fluid outlet are located at both ends of the first heat exchange pipe 21, and both the fluid inlet and fluid outlet are provided on the tank body 1.

[0054] In this design, the first heat exchange component 2 can ensure the heat exchange effect of the fluid, and the fluid inlet and fluid outlet are both located on the tank body 1, which facilitates the connection between the fluid inlet and fluid outlet and the external pipeline.

[0055] In some embodiments, the first heat exchange pipe 21 includes at least two parallel extending pipe bodies 211. The two ends of the multiple pipe bodies 211 are connected via an inlet pipe box 212 and an outlet pipe box 213, respectively. The fluid inlet is located on the inlet pipe box 212, and the fluid outlet is located on the outlet pipe box 213. Specifically, the single serpentine coil of the first heat exchange pipe 21 has its tube pass divided into two, and can be modified to have two or more parallel passes depending on pressure drop requirements. The inlet and outlet of the pipe body 211 converge via the inlet pipe box 212 and the outlet pipe box 213 to facilitate fluid transport. The pipe body 211 is fitted around the outer periphery of adjacent pipe bodies 211, allowing multiple pipe bodies 211 to extend in parallel.

[0056] This multi-pass parallel design, while ensuring the uniformity of heat exchange within the heat exchanger, will significantly reduce the system pressure drop, improve the system's operational stability, and reduce the failure rate.

[0057] In some implementations, such as Figure 1 As shown, the second heat exchange assembly 3 includes multiple C-shaped tubes 33 disposed on the inner wall of the tank 1. These C-shaped tubes 33 are spaced apart along the circumferential direction of the tank 1, and the ends of adjacent C-shaped tubes 33 are connected by bends, causing the gas channel 32 formed by the multiple C-shaped tubes 33 to extend in a bent manner. The C-shaped tubes 33 are semi-circular seamless steel pipes and are fastened to the inner wall of the tank 1, forming a jacket structure between the C-shaped tubes 33 and the inner wall of the tank 1 to allow gas flow. After the compressed gas flowing inside the C-shaped tubes 33 exchanges heat with the high-temperature medium in the heat exchange chamber 11, the high-temperature hot air is transported to subsequent equipment, specifically to the subsequent preheating heat exchanger 41, where it exchanges heat with the solar-heated extracted water.

[0058] In some embodiments, the turbulence section 31 includes a plurality of fins 311 evenly distributed on a plurality of C-shaped tubes 33, wherein the plurality of fins 311 on each C-shaped tube 33 are spaced apart along the extension direction of the C-shaped tube 33, that is, a plurality of fins 311 are wound around the outer periphery of each C-shaped tube 33.

[0059] In this design, the outer periphery of the C-shaped tube 33 is equipped with multiple fins 311, which can change the flow state of the medium in the shell side. This transforms the smooth inner wall of the tank 1 into an undulating flow channel filled with the surrounding fins 311, increasing the tendency for turbulent flow and enhancing the shell-side convective heat transfer coefficient. Thus, without affecting the shutdown and salt discharge of the heat exchanger, the equipment size of the heat exchanger can be significantly reduced by changing the structural form. It is estimated that this modification will save approximately 10% of the heat exchange area.

[0060] In some embodiments, the C-shaped tube 33 extends along the axial direction of the tank body 1. This design facilitates the arrangement of the C-shaped tube 33 and ensures the effective delivery of compressed gas. It is understood that the C-shaped tube 33 may also be extended at an angle as needed, and these are not limiting factors.

[0061] In some embodiments, the fins 311 extend radially along the tank body 1. This design facilitates the processing of the fins 311 while ensuring the turbulence effect of the medium. It is understood that the fins 311 can also be inclinedly arranged on the C-shaped tube 33 as needed, and these are not limiting factors.

[0062] In some embodiments, the medium inlet is located at the top of the tank 1, and the medium outlet is located at the bottom of the tank 1.

[0063] This design allows the medium, transported through the medium inlet, to flow from top to bottom into the heat exchange chamber 11, and under the action of pressure and gravity, to flow out through the medium outlet at the bottom of the tank 1, ensuring the effective transport of the medium.

[0064] Combination Figures 3 to 5 As shown, the present invention also provides a steam generation system, which includes a heat exchange device 4, a medium conveying device 5, and a fluid conveying device 6.

[0065] The heat exchange device 4 includes a preheating heat exchanger 41, a heating heat exchanger 42, and an evaporating heat exchanger 43. The heating heat exchanger 42 and / or the evaporating heat exchanger 43 employ the heat exchange apparatus described above, which includes all the technical features of the aforementioned heat exchange apparatus. Preferably, both the heating heat exchanger 42 and the evaporating heat exchanger 43 employ the aforementioned heat exchange apparatus.

[0066] The medium conveying device 5 includes a medium conveying device 51 and a medium recovery device 52. The medium conveyed by the medium conveying device 51 flows sequentially through the shell side of the evaporator heat exchanger 43 and the heating heat exchanger 42 and then flows back into the medium recovery device 52. The medium conveyed by the medium conveying device 5 is molten salt. The medium conveying device 51 is a high-temperature molten salt storage tank 511, and the medium recovery device 52 is a low-temperature molten salt storage tank 521. The high-temperature molten salt storage tank 511 is used to store high-temperature molten salt, and the low-temperature molten salt storage tank 521 is used to store low-temperature molten salt. In this application, "high temperature" and "low temperature" are relative, meaning that the temperature of the molten salt in the high-temperature molten salt storage tank 511 is higher than the temperature of the molten salt in the low-temperature molten salt storage tank 521.

[0067] The fluid transport equipment 6 includes a fluid transport device 61. The fluid transported by the fluid transport device 61 flows sequentially through the tubes of the preheating heat exchanger 41, the heating heat exchanger 42, and the evaporating heat exchanger 43, and flows out through the fluid outlet of the evaporating heat exchanger 43. The fluid transported by the fluid transport device 61 is produced water.

[0068] The gas outlet of the heating heat exchanger 42 and / or the evaporating heat exchanger 43 is connected to the gas inlet of the preheating heat exchanger 41, and the gas outlet of the preheating heat exchanger 41 is connected to the gas inlet of the heating heat exchanger 42 and / or the evaporating heat exchanger 43.

[0069] Specifically, such as Figure 3 As shown, the molten salt outlet of the high-temperature molten salt storage tank 511 is connected to the medium inlet pipe of the evaporator heat exchanger 43, so that the high-temperature molten salt in the high-temperature molten salt storage tank 511 can flow into the heat exchange chamber 11 of the evaporator heat exchanger 43. The medium outlet of the evaporator heat exchanger 43 is connected to the medium inlet of the heating heat exchanger 42, so that the medium of the evaporator heat exchanger 43 can flow into the heat exchange chamber 11 of the heating heat exchanger 42. The medium outlet of the heating evaporator is connected to the molten salt inlet of the low-temperature molten salt storage tank 521, so that the low-temperature molten salt after heat exchange can flow into the low-temperature molten salt storage tank 521. The low-temperature molten salt storage tank 521 and the high-temperature molten salt storage tank 511 are connected by a circulation pipe, and the circulation pipe is equipped with the following salt dissolving tank 9. The low-temperature molten salt in the low-temperature molten salt storage tank 521 flows to the salt dissolving tank 9 to be heated, and then flows back to the high-temperature molten salt storage tank 511, realizing the circulation and transportation of molten salt. The circulation pipeline is also equipped with a circulation pump to provide power for the circulation of molten salt.

[0070] The produced water outlet of the fluid conveying device 61 is connected to the produced water inlet of the preheating heat exchanger 41, so that the produced water conveyed by the fluid conveying device 61 enters the tube side of the preheating heat exchanger 41. The produced water outlet of the preheating heat exchanger 41 is connected to the fluid inlet of the heating heat exchanger 42, so that the produced water in the preheating heat exchanger 41 flows into the fluid channel of the preheating heat exchanger 41, and the produced water in the fluid channel of the heating heat exchanger 42 exchanges heat with the molten salt in the heat exchange chamber 11 of the preheating heat exchanger 41. The fluid after heat exchange flows out through the fluid outlet of the heating heat exchanger 42 and enters the fluid channel of the evaporating heat exchanger 43, where the produced water in the fluid channel of the evaporating heat exchanger 43 exchanges heat with the molten salt in the heat exchange chamber 11 of the evaporating heat exchanger 43, and the steam obtained from the heat exchange flows through the fluid outlet of the evaporating heat exchanger 43 to the target, specifically to the steam injection well.

[0071] In addition, compressed gas is introduced into the gas passage 32 within the heating heat exchanger 42 and the evaporating heat exchanger 43. After the compressed gas in the gas passage 32 exchanges heat with the molten salt in the heat exchange chamber 11 of the heating heat exchanger 42 and the evaporating heat exchanger 43 and is heated, it flows into the tube side of the preheating heat exchanger 41 through the gas outlet, so as to preheat the produced water in the tube side of the preheating heat exchanger 41 with high-temperature gas. The cooled gas then flows back into the gas passage 32 within the heating heat exchanger 42 and the evaporating heat exchanger 43. The circulation of the gas can be powered by a pump.

[0072] Based on the steam generation system provided by this invention, since the heat medium used for preheating produced water is replaced by hot air instead of high-pressure wet steam, the shell-side pressure of the preheating heat exchanger 41 is greatly reduced, allowing for an increase in the shell-side diameter and a reduction in wall thickness. Therefore, the design of using hot air in the shell side and high-pressure produced water in the tube side effectively reduces the manufacturing cost of the preheating heat exchanger 41 and increases its service life. Simultaneously, it reduces the overall system heat load. This change not only reduces the size of the equipment (including the medium conveying device 51, the medium recovery device 52, the preheating heat exchanger 41, the heating heat exchanger 42, and the evaporating heat exchanger 43), but also saves on equipment materials and molten salt, thereby reducing both equipment costs and system energy consumption.

[0073] In some embodiments, the ratio of the diameter to the height of the high-temperature molten salt storage tank 511 is greater than 1.2.

[0074] In this design, since the high-temperature molten salt storage tank 511 is used to store molten salt and the density of molten salt is relatively high, the high-temperature molten salt storage tank 511 adopts a flat design, which can ensure the storage effect of molten salt and the use effect of the high-temperature molten salt storage tank 511.

[0075] In some embodiments, the ratio of the diameter to the height of the cryogenic molten salt storage tank 521 is greater than 1.2.

[0076] In this design, since the cryogenic molten salt storage tank 521 is used to store molten salt and the density of molten salt is relatively high, the cryogenic molten salt storage tank 521 adopts a flat design, which can ensure the storage effect of molten salt and the use effect of the cryogenic molten salt storage tank 521.

[0077] A melting tank 9 for heating the molten salt is installed on the circulation pipeline between the high-temperature molten salt storage tank 511 and the low-temperature molten salt storage tank 521. In this design, the melting tank 9 can be used to melt and heat the solid molten salt in its initial state. During system operation, the low-temperature molten salt in the low-temperature molten salt storage tank 521 is heated by the melting tank 9 to obtain high-temperature molten salt, which is then transferred to the high-temperature molten salt storage tank 511. The high-temperature molten salt is used as a subsequent heat exchange medium to meet the requirements of molten salt recycling. The melting tank 9 contains heating rods for heating the molten salt. The melting tank 9 is a conventional technology in this field, and its structure and working principle are not described in detail here.

[0078] In some embodiments, the diameter of the tube side of the preheating heat exchanger 41, the heating heat exchanger 42, and the evaporating heat exchanger 43 is greater than dn65.

[0079] In this design, since the produced water from the oilfield contains relatively many impurities (and impurities still exist after treatment), in order to avoid pipeline blockage, the diameter of the tube side of the preheating heat exchanger 41, heating heat exchanger 42 and evaporating heat exchanger 43 is set to be greater than dn65 to meet the transportation requirements of the produced water.

[0080] In some implementations, combined Figure 4 and Figure 5 As shown, the shell side of the preheating heat exchanger 41, the heating heat exchanger 42 and the evaporating heat exchanger 43 are connected in series, and the preheating heat exchanger 41, the heating heat exchanger 42 and the evaporating heat exchanger 43 are supported by the bracket 7.

[0081] This design simplifies the manufacturing process, reduces the equipment's footprint, and improves system integration. Simultaneously, the reduced medium pressure on the shell side also lowers the equipment's safety risks.

[0082] In some implementations, reference continues. Figure 4 and Figure 5 The preheating heat exchanger 41, the heating heat exchanger 42 and the evaporating heat exchanger 43 are arranged in a triangular pattern on the support 7.

[0083] This design approach further reduces the space occupied by the equipment and makes the support structure 7 more stable.

[0084] In some embodiments, the fluid conveying device 61 further includes an electric heater 8 for preheating the outflowing fluid. This design, using electric heating to preheat the fluid, effectively reduces carbon emissions and meets environmental protection requirements.

[0085] In some embodiments, the electric heater 8 includes an electric heating rod 81 connected to a power source to preheat the fluid conveyed by the fluid conveying device 61. The electric heating rod 81 is a conventional component in the heating field, and its structure and working principle are not described in detail here.

[0086] In some embodiments, the medium conveying device 51 is provided with a first solar panel 512 for providing electrical energy to the electric heater 8. Specifically, the first solar panel 512 is disposed on the top of the high-temperature molten salt storage tank 511.

[0087] During the day, the first solar panel 512 generates electricity under sunlight and supplies it to the electric heating rod 81. The electric heating rod 81 preheats the extracted water, thereby increasing the temperature of the extracted water transported by the fluid conveying device 61. In this design, by installing the first solar panel 512 on the top of the high-temperature molten salt storage tank 511 to provide electricity to the electric heating rod 81, the top area of ​​the high-temperature molten salt storage tank 511 can be fully utilized, resulting in rational use of space.

[0088] In some embodiments, the medium recovery device 52 is provided with a second solar panel 522 for providing power to the electric heater 8. Specifically, the second solar panel 522 is disposed on the top of the cryogenic molten salt storage tank 521.

[0089] During the day, the second solar panel 522 generates electricity under sunlight and supplies it to the electric heating rod 81. The electric heating rod 81 preheats the extracted water, thereby increasing the temperature of the extracted water transported by the fluid conveying device 61. This design, by installing the second solar panel 522 on the top of the cryogenic molten salt storage tank 521 to provide electricity to the electric heating rod 81, fully utilizes the top area of ​​the cryogenic molten salt storage tank 521, resulting in efficient space utilization.

[0090] The solar panels, being conventional components for capturing solar energy and converting it into electricity, are not described in detail here. This invention, by installing a first solar panel 512 and a second solar panel 522 on the top of the high-temperature molten salt storage tank 511 and the low-temperature molten salt storage tank 521 respectively, not only improves energy utilization efficiency and reduces the overall system's dependence on off-peak electricity from the grid, but also makes full use of renewable energy and site space. Furthermore, using renewable solar energy for preheating reduces carbon emissions and meets environmental protection requirements.

[0091] The steam generation system provided by this invention achieves efficient and stable supply of large-tonnage steam by optimizing structural design, improving energy utilization methods, and increasing heat transfer efficiency, thereby reducing energy consumption and equipment costs and improving the economic benefits and environmental performance of oilfield exploitation.

[0092] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0093] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention described herein.

Claims

1. A steam generating system, characterized by, The application relates to a heat exchange device (4) comprising a preheating heat exchanger (41), a heating heat exchanger (42) and an evaporation heat exchanger (43), wherein the heating heat exchanger (42) and / or the evaporation heat exchanger (43) adopt a heat exchange device; wherein the heat exchange device comprises a tank body (1), a first heat exchange assembly (2) and a second heat exchange assembly (3), the tank body (1) is internally formed with a heat exchange cavity (11), the tank body (1) is provided with a medium inlet and a medium outlet which are in communication with the heat exchange cavity (11), the first heat exchange assembly (2) is arranged in the heat exchange cavity (11), the first heat exchange assembly (2) is internally formed with a fluid channel, the first heat exchange assembly (2) is provided with a fluid inlet and a fluid outlet which are in communication with the fluid channel, the second heat exchange assembly (3) is arranged on the inner wall of the tank body (1), the second heat exchange assembly (3) is provided with a flow disturbing part (31) and is arranged to enable the medium flowing into the heat exchange cavity (11) to change a flowing path under the action of the flow disturbing part (31); wherein the second heat exchange assembly (3) is internally formed with a gas channel (32), the second heat exchange assembly (3) is provided with a gas inlet and a gas outlet which are in communication with the gas channel (32). A medium conveying device (5) comprises a medium conveying device (51) and a medium recovery device (52), the medium conveyed through the medium conveying device (51) flows through the shell side of the evaporation heat exchanger (43) and the heating heat exchanger (42) in sequence and returns to the medium recovery device (52). A fluid conveying device (6) comprises a fluid conveying device (61), the fluid conveyed through the fluid conveying device (61) flows through the tube side of the preheating heat exchanger (41), the heating heat exchanger (42) and the evaporation heat exchanger (43) in sequence and flows out through the fluid outlet of the evaporation heat exchanger (43). The gas outlet of the heating heat exchanger (42) and / or the evaporation heat exchanger (43) is in communication with the gas inlet of the preheating heat exchanger (41), and the gas outlet of the preheating heat exchanger (41) is in communication with the gas inlet of the heating heat exchanger (42) and / or the evaporation heat exchanger (43). The first heat exchange assembly (2) comprises a first heat exchange pipeline (21), the first heat exchange pipeline (21) is bent and extended, the fluid inlet and the fluid outlet are located at two ends of the first heat exchange pipeline (21), and the fluid inlet and the fluid outlet are both arranged on the tank body (1).

2. The steam generation system of claim 1, wherein, The first heat exchange pipeline (21) comprises at least two pipeline bodies (211) which are arranged in parallel, the two ends of a plurality of pipeline bodies (211) are communicated through an inlet pipe box (212) and an outlet pipe box (213), the fluid inlet is arranged on the inlet pipe box (212), and the fluid outlet is arranged on the outlet pipe box (213).

3. The steam generation system of claim 2, wherein, ​ 4. The steam generation system of claim 1, wherein, The second heat exchange assembly (3) comprises a plurality of C-shaped tubes (33) arranged on the inner wall of the tank body (1), the plurality of C-shaped tubes (33) are arranged at intervals along the circumferential direction of the tank body (1), and the ends of two adjacent C-shaped tubes (33) are connected by an elbow pipe, so that the gas passage (32) formed by the plurality of C-shaped tubes (33) extends in a zigzag manner.

5. The steam generation system of claim 4, wherein, The spoiler (31) comprises a plurality of fins (311) uniformly distributed on the plurality of C-shaped tubes (33), and the plurality of fins (311) on each C-shaped tube (33) are arranged at intervals along the extension direction of the C-shaped tube (33).

6. The steam generation system of claim 4, wherein, The C-shaped tube (33) extends along the axial direction of the tank body (1).

7. The steam generation system of claim 5, wherein, The fin (311) extends along the radial direction of the tank body (1).

8. The steam generation system of claim 1, wherein, The medium inlet is arranged at the top of the tank body (1), and the medium outlet is arranged at the bottom of the tank body (1).

9. The steam generation system of claim 1, wherein, The medium transported by the medium conveying device (5) is molten salt, the medium conveying device (51) is a high-temperature molten salt storage tank (511), and the medium recovery device (52) is a low-temperature molten salt storage tank (521).

10. The steam generation system of claim 9, wherein, The ratio of the diameter to the height of the high-temperature molten salt storage tank (511) is greater than 1.

2. And / or, the ratio of the diameter to the height of the low-temperature molten salt storage tank (521) is greater than 1.

2.

11. The steam generation system of claim 9, wherein, A salt melting tank (9) for heating molten salt is arranged on the circulating pipeline of the high-temperature molten salt storage tank (511) and the low-temperature molten salt storage tank (521).

12. The steam generation system of claim 1, wherein, The fluid transported by the fluid conveying device (61) is produced water.

13. The steam generation system of claim 12, wherein, The diameters of the tube sides of the preheating heat exchanger (41), the heating heat exchanger (42), and the evaporation heat exchanger (43) are greater than dn65.

14. The steam generation system of claim 1, wherein, The shell sides of the preheating heat exchanger (41), the heating heat exchanger (42), and the evaporation heat exchanger (43) are connected in series, and the preheating heat exchanger (41), the heating heat exchanger (42), and the evaporation heat exchanger (43) are supported by the support (7).

15. The steam generation system of claim 14, wherein, The preheating heat exchanger (41), the heating heat exchanger (42), and the evaporation heat exchanger (43) are arranged in a triangular shape on the support (7).

16. The steam generation system of claim 1, wherein, The fluid conveying device (61) further comprises an electric heater (8) for preheating the outflowing fluid.

17. The steam generation system of claim 16, wherein, The electric heater (8) comprises an electric heating rod (81).

18. The steam generation system of claim 16, wherein, A first solar cell panel (512) for providing electric energy to the electric heater (8) is arranged on the medium conveying device (51).

19. The steam generation system of claim 16, wherein, A second solar cell panel (522) for providing electric energy to the electric heater (8) is arranged on the medium recovery device (52).

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