Heat exchange device and steam generation system

Abstract

The invention relates to the field of heat exchange equipment, and discloses a heat exchange device and a steam generation system. The heat exchange device comprises a tank body, a first heat exchange assembly and a second heat exchange assembly, and a heat exchange cavity is formed in the tank body; the first heat exchange assembly is arranged in the heat exchange cavity, and a fluid channel is formed in the first heat exchange assembly; the second heat exchange assembly is arranged on the inner wall of the tank body, a turbulent flow part is arranged on the second heat exchange assembly, and a gas channel is formed in the second heat exchange assembly. According to the heat exchange device, the shell pass pressure in the preheating section heat exchanger can be effectively reduced, the diameter of the shell pass is enlarged, the wall thickness is reduced, the cost is reduced, meanwhile, the safety risk of equipment is reduced, the turbulent flow part is arranged on the second heat exchange assembly, the medium turbulent flow trend is improved, the shell pass convection heat transfer coefficient is increased, and the heat exchange efficiency is improved. Therefore, the size of the tank body is greatly reduced by changing the structural form, the overall equipment size is reduced, the occupied area is reduced, and the economical efficiency and practicability of the overall equipment are improved.

Description

Technical Field

[0001] The invention relates to the field of heat exchange equipment, and in particular to a heat exchange device and a steam generating system. Background Art

[0002] With the transformation of the global energy structure and the improvement of environmental protection requirements, the oilfield exploitation field is facing unprecedented challenges and opportunities. In response to this, the electric thermal molten salt energy storage steam injection test station was born, marking an important breakthrough in the application of electric thermal molten salt energy storage technology in the oilfield exploitation field.

[0003] The test station innovatively uses valley electricity from the power grid to heat molten salt, efficiently converting electrical energy into thermal energy and storing it in liquid molten salt. Subsequently, a large amount of steam is generated through the continuous heat exchange process between high-temperature molten salt and softened water, providing a stable steam supply for the surrounding heavy oil thermal recovery wells. According to statistics, the test station has an energy storage scale of 15 megawatts and 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 old oil fields during heavy oil thermal recovery, but also lays a solid foundation for the comprehensive promotion and application of electric thermal molten salt energy storage technology.

[0004] The test station has made remarkable achievements in technology and environmental protection, but some problems have also been exposed during actual operation. The test station adopts an extraction steam preheating process, using the direct steam generated by the evaporator to return to the preheating evaporator to preheat the produced water. This design effectively prevents the solidification of molten salt caused by direct contact between low-temperature produced water and molten salt, but it also brings about the problem of overload design. Specifically, the design amount of molten salt and steam exceeds the actual steam injection demand. With the further expansion of the energy storage scale, the size of the molten salt storage tank and the steam generating device will increase sharply to adapt to the system pressure, which not only increases the manufacturing cost, but also reduces the economy and practicality of the system. In addition, during the operation of the steam generator, the molten salt flows smoothly, and the steam generator also exposes the problem of low heat transfer efficiency. Summary of the invention

[0005] In order to solve the technical problems of the current steam generator, such as large size, high manufacturing cost, poor economy and practicality, and low heat transfer efficiency, the present invention provides a heat exchange device and a steam generating system.

[0006] The present invention provides a heat exchange device, comprising: A tank body, wherein a heat exchange cavity is formed inside the tank body, and a medium inlet and a medium outlet communicated with the heat exchange cavity are provided on the tank body; A first heat exchange component is disposed in the heat exchange cavity, a fluid channel is formed in the first heat exchange component, and a fluid inlet and a fluid outlet connected to the fluid channel are provided on the first heat exchange component; and A second heat exchange component is arranged on the inner wall of the tank body, the second heat exchange component is provided with a flow spoiler, and is arranged so that the medium flowing into the heat exchange cavity can change the flow path under the action of the flow spoiler; A gas channel is formed inside the second heat exchange component, and a gas inlet and a gas outlet connected to the gas channel are provided on the second heat exchange component.

[0007] Optionally, the first heat exchange component includes a first heat exchange pipe, the first heat exchange pipe is bent and extended, the fluid inlet and the fluid outlet are located at two ends of the first heat exchange pipe, and the fluid inlet and the fluid outlet are both arranged on the tank body.

[0008] Optionally, the first heat exchange pipe includes at least two pipe bodies extending in parallel, and both ends of the plurality of pipe bodies are connected through an inlet pipe box and an outlet pipe box respectively, the fluid inlet is arranged on the inlet pipe box, and the fluid outlet is arranged on the outlet pipe box.

[0009] Optionally, the second heat exchange component includes a plurality of C-shaped tubes arranged on the inner wall of the tank body, the plurality of C-shaped tubes are arranged at intervals along the circumferential direction of the tank body, and the ends of two adjacent C-shaped tubes are connected by a bend pipe so that the gas channel formed by the plurality of C-shaped tubes is bent and extended.

[0010] Optionally, the spoiler includes a plurality of fins uniformly distributed on a plurality of the C-shaped tubes, and the plurality of fins on each of the C-shaped tubes are arranged at intervals along an extension direction of the C-shaped tube.

[0011] Optionally, the C-shaped tube extends along the axial direction of the tank body.

[0012] Optionally, the fins extend along the radial direction of the tank body.

[0013] Optionally, the medium inlet is arranged at the top of the tank body, and the medium outlet is arranged at the bottom of the tank body.

[0014] The present invention also provides a steam generating system, comprising: Heat exchange equipment, 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 adopts the above-mentioned heat exchange device; The medium conveying equipment includes a medium conveying device and a medium recovery device, wherein the medium conveyed by the medium conveying device flows through the shell side of the evaporating heat exchanger and the heating heat exchanger in sequence and flows back to the medium recovery device; A fluid conveying device, comprising a fluid conveying device, wherein the fluid conveyed by the fluid conveying device flows through the tubes of the preheating heat exchanger, the heating heat exchanger and the evaporating heat exchanger in sequence and flows out through the fluid outlet of the evaporating heat exchanger; The gas outlet of the heating heat exchanger and / or the evaporating heat exchanger is communicated with the gas inlet of the preheating heat exchanger, and the gas outlet of the preheating heat exchanger is communicated with the gas inlet of the heating heat exchanger and / or the evaporating heat exchanger.

[0015] Optionally, the medium transported by the medium transporting equipment is molten salt, the medium transporting device is a high-temperature molten salt storage tank, and the medium recovery device is a low-temperature molten salt storage tank.

[0016] Optionally, the ratio of the diameter to the height of the high-temperature molten salt storage tank is greater than 1.2; And / or, the ratio of the diameter to the height of the low-temperature molten salt storage tank is greater than 1.2.

[0017] Optionally, a salt 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.

[0018] Optionally, the fluid transported by the fluid transport device is produced water.

[0019] Optionally, the diameters of the tubes of the preheating heat exchanger, the heating heat exchanger and the evaporating heat exchanger are greater than dn65.

[0020] Optionally, the shell sides 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.

[0021] Optionally, the preheating heat exchanger, the heating heat exchanger and the evaporating heat exchanger are arranged in a triangle on the bracket.

[0022] Optionally, the fluid delivery device further comprises an electric heater for preheating the outflowing fluid.

[0023] Optionally, the electric heater comprises an electric heating rod.

[0024] Optionally, the medium conveying device is provided with a first solar panel for providing electrical energy to the electric heater.

[0025] Optionally, the medium recovery device is provided with a second solar panel for providing electrical energy to the electric heater.

[0026] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art: Based on the heat exchange device provided by the present invention, high-temperature hot air is formed by passing compressed gas into the second heat exchange component to exchange heat with the high-temperature medium in the heat exchange cavity, and then the high-temperature hot air enters the subsequent preheating section heat exchanger for heat exchange, thereby effectively reducing the shell side pressure in the preheating section heat exchanger, so that the shell side diameter can be enlarged and the wall thickness can be reduced, thereby reducing costs and reducing the safety risks of the equipment. A spoiler is arranged on the second heat exchange component, which can disturb the flowing medium, increase the turbulent flow trend of the medium, and increase the shell side convective heat transfer coefficient. Therefore, under the premise of not affecting the shutdown and salt discharge of the tank body, the size of the tank body itself can be greatly reduced by changing the structural form, thereby reducing the overall equipment size, reducing the floor space, and improving the economy and practicality of the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0028] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for use in the implementation mode or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 is a cross-sectional view of a heat exchange device according to an embodiment of the present invention; Figure 2 A schematic diagram of a connection method of a first heat exchange pipe of a heat exchange device according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the steam generation system according to an embodiment of the present invention; Figure 4 This is a front view of the heat exchange device according to an embodiment of the present invention; Figure 5 It is a side view of the heat exchange device described in the embodiment of the present invention.

[0030] Description of Reference Numerals 1. Tank body; 11. Heat exchange cavity; 2. First heat exchange component; 21. First heat exchange pipe; 211. Pipe body; 212. Inlet pipe box; 213. Outlet pipe box; 3. Second heat exchange component; 31. Turbine; 311. Fin; 32. Gas channel; 33. C-shaped pipe; 4. Heat exchange equipment; 41. Preheating heat exchanger; 42. Heating heat exchanger; 43. Evaporation heat exchanger; 5. Medium conveying equipment; 51. Medium conveying device; 511. High-temperature molten salt storage tank; 512. First solar cell panel; 52. Medium recovery device; 521. Low-temperature molten salt storage tank; 522. Second solar cell panel; 6. Fluid conveying equipment; 61. Fluid conveying device; 7. Bracket; 8. Electric heater; 81. Electric heating rod; 9. Salt tank. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] The following description sets forth many specific details to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the implementation methods in the specification are only part of the implementation methods of the present invention, rather than all of the implementation methods.

[0033] Combination Figure 1 and Figure 2 As shown, the heat exchange device provided in the embodiment of the present invention includes a tank body 1, a first heat exchange component 2 and a second heat exchange component 3.

[0034] A heat exchange cavity 11 is formed inside the tank body 1, and a medium inlet and a medium outlet are provided on the tank body 1, which are connected to the heat exchange cavity 11. The medium can enter the heat exchange cavity 11 through the medium inlet, and then flow out through the medium outlet. At this time, the medium goes through the shell side, wherein the medium here can be molten salt, that is, the molten salt goes through the shell side of the tank body 1, avoiding the blockage of the pipeline caused by the pipe side, and ensuring the use effect of the tank body 1.

[0035] The first heat exchange component 2 is arranged in the heat exchange cavity 11, and a fluid channel is formed in the first heat exchange component 2, wherein the fluid channel is bent and extended in a folded shape to increase the flow path of the fluid and ensure the heat exchange effect. The first heat exchange component 2 is provided with a fluid inlet and a fluid outlet connected to the fluid channel. The fluid can enter the fluid channel through the fluid inlet and then flow out through the fluid outlet so that the fluid runs through the pipe circuit. Among them, the fluid here can be processed produced water, that is, the produced water runs through the pipe circuit in the heat exchange device. The fluid in the fluid channel exchanges heat with the medium in the heat exchange cavity 11.

[0036] The second heat exchange component 3 is arranged on the inner wall of the tank body 1. The arrangement of the second heat exchange component 3 is not limited and can be welding or the like. The second heat exchange component 3 is provided with a spoiler 31, wherein the spoiler 31 is arranged on the side of the axis of the second heat exchange component 3 facing the tank body 1, so that the medium flowing through the heat exchange cavity 11 can contact the spoiler 31. The medium flowing into the heat exchange cavity 11 can change the flow path under the action of the spoiler 31 to increase the turbulent flow trend of the medium and increase the shell-side convective heat transfer coefficient, thereby greatly reducing the equipment size of the heat exchange device by changing the structural form without affecting the shutdown and salt discharge of the heat exchange device. Among them, a gas channel 32 is formed inside the second heat exchange component 3, and a gas inlet and a gas outlet connected to the gas channel 32 are provided on the second heat exchange component 3. The gas can enter the gas channel 32 through the gas inlet, and then flow to the target position 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 cavity 11.

[0037] Based on the heat exchange device provided by the present invention, high-temperature hot air is formed by passing compressed gas into the second heat exchange component 3 to exchange heat with the high-temperature medium in the heat exchange cavity 11, and then the high-temperature hot air enters the subsequent preheating section heat exchanger for heat exchange, thereby effectively reducing the shell side pressure in the preheating section heat exchanger, so that the shell side diameter can be enlarged and the wall thickness can be reduced, thereby reducing costs and reducing the safety risks of the equipment. A spoiler 31 is provided on the second heat exchange component 3, which can play a spoiler role on the flowing medium, improve the turbulent trend of the medium, and increase the shell side convective heat transfer coefficient. Therefore, under the premise of not affecting the shutdown and salt discharge of the tank body 1, the size of the tank body 1 itself can be greatly reduced by changing the structural form, thereby reducing the overall equipment size, reducing the floor area, improving the economy and practicality of the overall equipment, and being able to reduce energy consumption and emissions to meet the growing energy demand and environmental protection requirements in the field of oil field exploitation.

[0038] 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 the fluid outlet are located at both ends of the first heat exchange pipe 21, and the fluid inlet and the fluid outlet are both arranged on the tank body 1.

[0039] The first heat exchange component 2 in this design can ensure the heat exchange effect of the fluid, and the fluid inlet and the fluid outlet are both arranged on the tank body 1, which facilitates the fluid inlet and the fluid outlet to be connected with the external pipeline.

[0040] In some embodiments, the first heat exchange pipe 21 includes at least two pipe bodies 211 extending in parallel, and the two ends of the plurality of pipe bodies 211 are respectively connected through an inlet pipe box 212 and an outlet pipe box 213, and the fluid inlet is arranged on the inlet pipe box 212, and the fluid outlet is arranged on the outlet pipe box 213. Specifically, the pipe pass of a single serpentine coil of the first heat exchange pipe 21 is divided into two, and two or more pipe passes are changed to parallel according to the pressure drop requirement, and the inlet and outlet of the pipe body 211 are merged through the inlet pipe box 212 and the outlet pipe box 213 to facilitate the transmission of the fluid. Among them, the pipe body 211 is sleeved on the outer periphery of the adjacent pipe body 211, so that the plurality of pipe bodies 211 extend in parallel.

[0041] This multi-pass parallel design will significantly reduce the system pressure drop, improve the system operation stability and reduce the failure rate while ensuring the uniformity of heat exchange inside the heat exchange device.

[0042] In some embodiments, Figure 1 As shown, the second heat exchange assembly 3 includes a plurality of C-shaped tubes 33 arranged on the inner wall of the tank body 1, and 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 a bend pipe, so that the gas channel 32 formed by the plurality of C-shaped tubes 33 is bent and extended. Among them, the C-shaped tube 33 is a semicircular seamless steel tube, and is buckled on the inner wall of the tank body 1, so that a jacket structure is formed between the C-shaped tube 33 and the inner wall of the tank body 1 for gas circulation. After the compressed gas circulating in the C-shaped tube 33 exchanges heat with the high-temperature medium in the heat exchange cavity 11, the high-temperature hot air is transported to the subsequent equipment, specifically, it can be transported to the subsequent preheating heat exchanger 41, and exchanges heat with the produced water heated by solar energy.

[0043] In some embodiments, the spoiler 31 includes a plurality of fins 311 evenly distributed on a plurality of C-shaped tubes 33 , and 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 wrapped around the outer circumference of each C-shaped tube 33 .

[0044] In this design, a plurality of fins 311 are provided on the outer periphery of the C-shaped tube 33, which can change the flow state of the medium in the shell side, and change the smooth inner wall of the tank body 1 into a flow channel with ups and downs and full of fins 311, thereby increasing the turbulent flow trend of the medium and increasing the shell side convective heat transfer coefficient, thereby greatly reducing the equipment size of the heat exchange device by changing the structural form without affecting the shutdown and salt discharge of the heat exchange device. It is estimated that this modification will save about 10% of the heat exchange area of ​​the equipment.

[0045] In some embodiments, the C-shaped tube 33 extends along the axial direction of the tank body 1. The C-shaped tube 33 in this design is easy to arrange and can ensure the delivery effect of compressed gas. It is understandable that the C-shaped tube 33 can also be extended at an angle according to needs, which is not restrictive.

[0046] In some embodiments, the fins 311 extend along the radial direction of the tank body 1. This design facilitates the processing of the fins 311 and ensures the turbulence effect of the medium. It is understandable that the fins 311 can also be tilted on the C-shaped tube 33 according to needs, which is not restrictive.

[0047] In some embodiments, the medium inlet is disposed at the top of the tank body 1 , and the medium outlet is disposed at the bottom of the tank body 1 .

[0048] In this design, the medium transported through the medium inlet flows into the heat exchange cavity 11 from top to bottom, and flows out through the medium outlet at the bottom of the tank body 1 under the action of pressure and gravity, thereby ensuring the medium transport effect.

[0049] Combination Figures 3 to 5 As shown, the present invention further provides a steam generation system, which includes a heat exchange device 4, a medium conveying device 5 and a fluid conveying device 6.

[0050] The heat exchange device 4 includes a preheating heat exchanger 41, a heating heat exchanger 42 and an evaporating heat exchanger 43, wherein the heating heat exchanger 42 and / or the evaporating heat exchanger 43 adopt the above-mentioned heat exchange device, and the heat exchange device here includes all the technical features of the above-mentioned heat exchange device. Preferably, both the heating heat exchanger 42 and the evaporating heat exchanger 43 adopt the above-mentioned heat exchange device.

[0051] 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 through the shell side of the evaporation heat exchanger 43 and the heating heat exchanger 42 in sequence and flows back to the medium recovery device 52. Among them, 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. The high temperature and low temperature in this application are relative, that is, the molten salt temperature in the high-temperature molten salt storage tank 511 is higher than the molten salt temperature in the low-temperature molten salt storage tank 521.

[0052] The fluid conveying device 6 includes a fluid conveying device 61. The fluid conveyed by the fluid conveying device 61 flows through the tubes of the preheating heat exchanger 41, the heating heat exchanger 42 and the evaporating heat exchanger 43 in sequence and flows out through the fluid outlet of the evaporating heat exchanger 43. The fluid conveyed by the fluid conveying device 61 is produced water.

[0053] The gas outlet of the heating heat exchanger 42 and / or the evaporating heat exchanger 43 is communicated with the gas inlet of the preheating heat exchanger 41 , and the gas outlet of the preheating heat exchanger 41 is communicated with the gas inlet of the heating heat exchanger 42 and / or the evaporating heat exchanger 43 .

[0054] Specifically, Figure 3 As shown, the molten salt outlet of the high-temperature molten salt storage tank 511 is connected to the medium inlet pipeline of the evaporation 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 cavity 11 of the evaporation heat exchanger 43. The medium outlet of the evaporation heat exchanger 43 is connected to the medium inlet of the heating heat exchanger 42, so that the medium of the evaporation heat exchanger 43 can flow into the heat exchange cavity 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 is connected to the high-temperature molten salt storage tank 511 through a circulation pipeline, and the following salt tank 9 is provided on the circulation pipeline. The low-temperature molten salt in the low-temperature molten salt storage tank 521 flows to the salt tank 9 for heating, and then flows to the high-temperature molten salt storage tank 511 to realize the circulation and transportation of the molten salt. A circulation pump is also provided on the circulation pipeline to provide power for the circulation of molten salt.

[0055] 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 pipe 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 cavity 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, and the produced water in the fluid channel of the evaporating heat exchanger 43 exchanges heat with the molten salt in the heat exchange cavity 11 of the evaporating heat exchanger 43. The steam obtained by heat exchange flows to the target through the fluid outlet of the evaporating heat exchanger 43, which can be specifically to the steam injection well.

[0056] In addition, compressed gas is introduced into the gas channel 32 in the heating heat exchanger 42 and the evaporation heat exchanger 43. The compressed gas in the gas channel 32 exchanges heat with the molten salt in the heat exchange cavity 11 in the heating heat exchanger 42 and the evaporation heat exchanger 43, and then flows into the tube side of the preheating heat exchanger 41 through the gas outlet to preheat the produced water in the tube side of the preheating heat exchanger 41 through the high-temperature gas. The cooled gas flows back to the gas channel 32 in the heating heat exchanger 42 and the evaporation heat exchanger 43, wherein the circulating flow of the gas can be powered by the pump body.

[0057] Based on the steam generation system provided by the present invention, since the heat medium used for preheating produced water is replaced by hot air from high-pressure wet steam, the shell pressure of the preheating heat exchanger 41 is greatly reduced, the shell diameter can be enlarged, and the wall thickness can be reduced. Therefore, the design method of using hot air in the shell and high-pressure produced water in the tube can effectively reduce the manufacturing cost of the preheating heat exchanger 41 and increase the service life of the preheating heat exchanger 41. At the same time, the heat load of the entire system is reduced. 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 evaporation heat exchanger 43), but also saves equipment materials and molten salt, thereby not only reducing the equipment cost, but also reducing the energy consumption of the system.

[0058] 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.

[0059] In this design, since the high-temperature molten salt storage tank 511 is used to store molten salt and the density of the molten salt is relatively large, the high-temperature molten salt storage tank 511 adopts a flat design, which can ensure the storage effect of the molten salt and the use effect of the high-temperature molten salt storage tank 511.

[0060] In some embodiments, the ratio of the diameter to the height of the low-temperature molten salt storage tank 521 is greater than 1.2.

[0061] In this design, since the low-temperature molten salt storage tank 521 is used to store molten salt and the density of the molten salt is relatively large, the low-temperature molten salt storage tank 521 adopts a flat design, which can ensure the storage effect of the molten salt and the use effect of the low-temperature molten salt storage tank 521.

[0062] A salt tank 9 for heating the molten salt is provided on the circulation pipeline of the high-temperature molten salt storage tank 511 and the low-temperature molten salt storage tank 521. Under this design mode, the salt tank 9 can be used for melting and heating the solid molten salt in the initial state. During the operation of the system, the low-temperature molten salt in the low-temperature molten salt storage tank 521 is heated by the salt tank 9 to obtain high-temperature molten salt, and then enters the high-temperature molten salt storage tank 511. The high-temperature molten salt is used as a subsequent heat exchange medium to meet the recycling needs of the molten salt. Among them, a heating rod for heating the molten salt is provided inside the salt tank 9. The salt tank 9 is a conventional technology in this field, and its structure and working principle are not described in detail here.

[0063] In some embodiments, the diameters of the tubes of the preheating heat exchanger 41, the heating heat exchanger 42, and the evaporating heat exchanger 43 are greater than dn65.

[0064] Under this design, since the oilfield produced water contains relatively more impurities (impurities still exist after treatment), in order to avoid pipeline blockage, the diameter of the pipes of the preheating heat exchanger 41, the heating heat exchanger 42 and the evaporating heat exchanger 43 is set to be larger than dn65 to meet the transportation requirements of the produced water.

[0065] In some embodiments, in combination Figure 4 and Figure 5 As shown, the shell sides 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 a bracket 7 .

[0066] This design simplifies the manufacturing process, reduces the equipment footprint, and improves the system integration. At the same time, the reduction of the shell side medium pressure also reduces the safety risk of the equipment.

[0067] In some embodiments, continue to refer to 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 triangle on the bracket 7 .

[0068] This design can further reduce the space occupied by the equipment and make the structure of the bracket 7 more stable.

[0069] In some embodiments, the fluid delivery device 61 further includes an electric heater 8 for preheating the outflowing fluid. In this design, the fluid is preheated by electric heating, which can effectively reduce carbon emissions and meet environmental protection requirements.

[0070] In some embodiments, the electric heater 8 includes an electric heating rod 81, which is connected to a power source to preheat the fluid transported by the fluid transport device 61 through the electric heating rod 81. The electric heating rod 81 is a conventional component in the heating field, and its structure and working principle are not described in detail herein.

[0071] In some embodiments, the medium conveying device 51 is provided with a first solar panel 512 for providing electric energy to the electric heater 8. Specifically, the first solar panel 512 is arranged on the top of the high-temperature molten salt storage tank 511.

[0072] During the day, with the irradiation of sunlight, the first solar panel 512 generates electric energy and provides it to the electric heating rod 81, which preheats the produced water to increase the temperature of the produced water transported by the fluid transport device 61. In this design, by arranging the first solar panel 512 on the top of the high-temperature molten salt storage tank 511 to provide electric energy to the electric heating rod 81, the top area of ​​the high-temperature molten salt storage tank 511 can be fully utilized, so that the space is reasonably used.

[0073] In some embodiments, the medium recovery device 52 is provided with a second solar panel 522 for providing electric energy to the electric heater 8. Specifically, the second solar panel 522 is arranged on the top of the low-temperature molten salt storage tank 521.

[0074] During the day, with the irradiation of sunlight, the second solar panel 522 generates electric energy and provides it to the electric heating rod 81, which preheats the produced water to increase the temperature of the produced water transported by the fluid transport device 61. In this design, by arranging the second solar panel 522 on the top of the low-temperature molten salt storage tank 521 to provide electric energy to the electric heating rod 81, the top area of ​​the low-temperature molten salt storage tank 521 can be fully utilized, so that the space is reasonably used.

[0075] Among them, the solar panel is a conventional component for obtaining solar energy and converting it into electrical energy, and its structure and working principle are not described in detail here. The present invention not only improves the energy utilization efficiency and reduces the overall system's dependence on grid valley electricity by arranging the first solar panel 512 and the 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, but also makes full use of renewable energy and site space. In addition, the use of renewable energy solar energy for preheating reduces carbon emissions and meets environmental protection requirements.

[0076] The steam generation system provided by the present invention realizes efficient and stable supply of large-tonnage steam, reduces energy consumption and equipment costs, and improves the economic benefits and environmental protection performance of oil field exploitation by optimizing structural design, improving energy utilization and enhancing heat transfer efficiency.

[0077] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0078] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be 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 present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features of the invention described herein.

Claims

1. A heat exchange device, characterized in that: include: A tank body (1) is formed with a heat exchange cavity (11) inside, and the tank body (1) is provided with a medium inlet and a medium outlet which are in communication with the heat exchange cavity (11); a first heat exchange component (2) disposed in the heat exchange cavity (11), wherein a fluid channel is formed in the first heat exchange component (2), and the first heat exchange component (2) is provided with a fluid inlet and a fluid outlet connected to the fluid channel; and A second heat exchange component (3) is arranged on the inner wall of the tank body (1), the second heat exchange component (3) is provided with a flow spoiler (31), and is arranged so that the medium flowing into the heat exchange cavity (11) can change its flow path under the action of the flow spoiler (31); A gas channel (32) is formed inside the second heat exchange component (3), and a gas inlet and a gas outlet which are in communication with the gas channel (32) are provided on the second heat exchange component (3).

2. The heat exchange device according to claim 1, characterized in that: The first heat exchange component (2) comprises a first heat exchange pipe (21), the first heat exchange pipe (21) is bent and extended, the fluid inlet and the fluid outlet are located at two ends of the first heat exchange pipe (21), and the fluid inlet and the fluid outlet are both arranged on the tank body (1).

3. The heat exchange device according to claim 2, characterized in that: The first heat exchange pipe (21) comprises at least two pipe bodies (211) extending in parallel, the two ends of the plurality of pipe bodies (211) being connected via an inlet pipe box (212) and an outlet pipe box (213), respectively; the fluid inlet is arranged on the inlet pipe box (212), and the fluid outlet is arranged on the outlet pipe box (213).

4. The heat exchange device according to claim 1, characterized in that: 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) being arranged at intervals along the circumferential direction of the tank body (1), and the ends of two adjacent C-shaped tubes (33) being connected by a bend pipe, so that the gas channel (32) formed by the plurality of C-shaped tubes (33) is bent and extended.

5. The heat exchange device according to claim 4, characterized in that: The spoiler (31) comprises a plurality of fins (311) uniformly distributed on a plurality of the C-shaped tubes (33), and the plurality of fins (311) on each of the C-shaped tubes (33) are arranged at intervals along an extension direction of the C-shaped tube (33).

6. The heat exchange device according to claim 4, characterized in that: The C-shaped tube (33) extends along the axial direction of the tank body (1).

7. The heat exchange device according to claim 5, characterized in that: The fins (311) extend along the radial direction of the tank body (1).

8. The heat exchange device according to claim 1, characterized in that: 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. A steam generating system, characterized in that: include: A heat exchange device (4), comprising a preheating heat exchanger (41), a heating heat exchanger (42) and an evaporating heat exchanger (43), wherein the heating heat exchanger (42) and / or the evaporating heat exchanger (43) adopts the heat exchange device according to any one of claims 1 to 8; The medium conveying device (5) comprises a medium conveying device (51) and a medium recovery device (52), wherein the medium conveyed by the medium conveying device (51) flows through the shell side of the evaporating heat exchanger (43) and the heating heat exchanger (42) in sequence and flows back into the medium recovery device (52); The fluid conveying device (6) comprises a fluid conveying device (61), wherein the fluid conveyed by the fluid conveying 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 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).

10. The steam generating system according to claim 9, characterized in that: The medium transported by the medium transport equipment (5) is molten salt, the medium transport 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).

11. The steam generating system according to claim 10, characterized in that: The ratio of the diameter to the height of the high-temperature molten salt storage tank (511) is greater than 1.2; And / or, a ratio of the diameter to the height of the low-temperature molten salt storage tank (521) is greater than 1.

2.

12. The steam generating system according to claim 10, characterized in that: A salt tank (9) for heating the molten salt is provided on the circulation pipeline between the high-temperature molten salt storage tank (511) and the low-temperature molten salt storage tank (521).

13. The steam generating system according to claim 9, characterized in that: The fluid transported by the fluid transport device (61) is produced water.

14. The steam generating system according to claim 13, characterized in that: The diameters of the tubes of the preheating heat exchanger (41), the heating heat exchanger (42) and the evaporating heat exchanger (43) are greater than dn65.

15. The steam generating system according to claim 9, characterized in that: The shell sides 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 a bracket (7).

16. The steam generating system according to claim 15, characterized in that: The preheating heat exchanger (41), the heating heat exchanger (42), and the evaporating heat exchanger (43) are arranged in a triangle on the bracket (7).

17. The steam generating system according to claim 9, characterized in that: The fluid delivery device (61) further comprises an electric heater (8) for preheating the outflowing fluid.

18. The steam generating system according to claim 17, characterized in that: The electric heater (8) comprises an electric heating rod (81).

19. The steam generating system according to claim 17, characterized in that: The medium conveying device (51) is provided with a first solar panel (512) for providing electric energy to the electric heater (8).

20. The steam generating system according to claim 17, characterized in that: The medium recovery device (52) is provided with a second solar cell panel (522) for providing electric energy to the electric heater (8).

Images