Steam generating device

Abstract

The invention relates to the field of heat exchange equipment, and discloses a steam generation device. The steam generation device comprises a tank body, a first heat exchange assembly and a second heat exchange assembly, and a first cavity and a second cavity are formed in the tank body; the first heat exchange assembly is arranged in the first cavity, the first heat exchange assembly is provided with a liquid inlet, and a first heat exchange channel is formed in the first heat exchange assembly; a second heat exchange channel is formed in the second heat exchange assembly; the first heat exchange channel is provided with a preheating section and a heating section, and the preheating section penetrates through the heating section. According to the steam generation device, liquid entering the preheating section is preheated through fluid in the heating section, the preheated liquid exchanges heat with fused salt entering the first cavity to be heated, the heated fluid enters the second heat exchange channel after passing through the heating section, and the liquid enters the second heat exchange channel after passing through the heating section. The molten salt is prevented from being in direct contact with low-temperature fluid to be solidified, the molten salt passes through the shell pass, the molten salt scaling phenomenon is avoided, and the pickling descaling frequency is reduced.

Description

Technical Field

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

[0003] The produced water from Liaohe Oilfield has the characteristics of high silicon, high chloride, and high mineralization. Under high temperature and high pressure conditions, the metal cations and silica have extremely low solubility and instability. Precipitation and crystallization will occur during the heat exchange process, and scale will gradually accumulate to form a blockage layer. If a shell and tube heat exchanger is used, it will inevitably cause blockage of the heat exchange tube. According to actual production experience, it is also necessary to reduce the frequency of pickling and descaling on site, and try to inject all media into the ground at the flow rate of the fluid. At present, the heat exchangers of molten salt energy storage related projects around the world are mainly shell and tube heat exchangers, which have a simple structure and high heat transfer efficiency. However, due to the small diameter of the heat exchange tube, this structure is not suitable for the special water quality of Liaohe Oilfield, which has become a technical obstacle to the promotion of molten salt energy storage technology in Liaohe Oilfield. Summary of the invention

[0004] In order to solve the technical problem that the heat exchange tubes of the current heat exchanger have small diameters and are easily blocked when used for heat exchange of produced water in oil fields, the present invention provides a steam generating device.

[0005] The present invention provides a steam generating device, comprising:

[0006] A tank body, wherein a first cavity and a second cavity are formed inside, the bottom of the first cavity is connected to the top of the second cavity through a pipeline, and the bottom of the second cavity is connected to a molten salt liquid supply pipeline;

[0007] A first heat exchange component is disposed in the first cavity, the first heat exchange component has a liquid inlet connected to the liquid supply pipeline, and a first heat exchange channel for liquid circulation is formed inside the first heat exchange component;

[0008] A second heat exchange component, wherein a second heat exchange channel connected to the liquid outlet of the first heat exchange channel is formed inside, and the second heat exchange channel is extended in a manner such that the fluid entering the second heat exchange channel flows from top to bottom;

[0009] Wherein, the first heat exchange channel has a preheating section arranged near the liquid inlet and a heating section arranged near the liquid outlet, and the preheating section passes through the heating section so that the liquid in the preheating section can be heated by the fluid in the heating section.

[0010] Optionally, the first heat exchange component includes a bent and extended first heat exchange tube, a portion of the first heat exchange tube arranged near the liquid outlet forms the heating section, and the heating section includes a plurality of heating tube segments, a portion of the first heat exchange tube arranged near the liquid inlet forms the preheating section, and the preheating section includes a plurality of preheating tube segments, and at least one preheating tube segment is passed through each of the heating tube segments.

[0011] Optionally, the first heat exchange tube is configured so that the fluid flowing into the first heat exchange tube first flows from top to bottom and then flows from bottom to top.

[0012] Optionally, the first heat exchange tubes form a multi-layer first heat exchange tube group from top to bottom, and each layer of the first heat exchange tube group includes a plurality of first heat exchange tube bodies arranged in sequence along the horizontal direction, so that the fluid entering the first heat exchange tube flows from the first heat exchange tube group of the upper layer to the first heat exchange tube group of the next layer.

[0013] Optionally, the heating pipe segment includes a straight pipe segment and a curved pipe segment for connecting two adjacent straight pipe segments, wherein a diameter of the curved pipe segment is smaller than a diameter of the straight pipe segment.

[0014] Optionally, the curved pipe section and the straight pipe section transition smoothly.

[0015] Optionally, three preheating pipe segments are inserted into each of the heating pipe segments, and the three preheating pipe segments are evenly distributed in the heating pipe segment.

[0016] Optionally, one of the preheating pipe sections shuttles through the curved pipe section.

[0017] Optionally, the first heat exchange tube further includes a transition section arranged outside the heating tube section.

[0018] Optionally, the transition section is located below the heating pipe section and the preheating pipe section.

[0019] Optionally, the transition section includes a plurality of transition pipe sections, and the diameter of the transition pipe section is the same as the diameter of the preheating pipe section.

[0020] Optionally, the liquid supply pipe is used to provide softened sewage toward the first heat exchange component.

[0021] Optionally, a connecting position between the first heat exchange channel and the second heat exchange channel is located at the top of the second cavity.

[0022] Optionally, the tank body is a horizontal cylindrical structure, and a support base for supporting the tank body is provided at the bottom of the tank body.

[0023] Optionally, the second heat exchange assembly includes a second heat exchange tube that is bent and extended, and the second heat exchange tube is bent and extended from top to bottom.

[0024] Optionally, the second heat exchange tubes form a multi-layer second heat exchange tube group from top to bottom, and each layer of the second heat exchange tube group includes a plurality of second heat exchange tube bodies arranged in sequence along the horizontal direction, so that the fluid entering the second heat exchange tube flows from the second heat exchange tube group of the upper layer to the second heat exchange tube group of the next layer.

[0025] Optionally, the tank body is provided with an explosion-proof component which is connected with the first cavity and the second cavity respectively.

[0026] Optionally, both ends of the tank body are sealed by arc-shaped end plates respectively.

[0027] Optionally, a molten salt liquid outlet pipe communicating with the first cavity is provided on the top of the tank body.

[0028] Optionally, the first cavity is separated from the second cavity by a partition, one end of the pipe is located at the top of the second cavity, and the other end passes through the partition and extends into the bottom of the first cavity.

[0029] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0030] In the steam generating device provided by the present invention, when liquid enters the first heat exchange component, it preferentially enters the preheating section. At this time, the liquid entering the preheating section will be preheated by the fluid in the heating section with a relatively high temperature. The preheated liquid will then exchange heat with the molten salt entering the first cavity to increase its temperature. The heated fluid passes through the heating section and enters the second heat exchange channel to avoid the molten salt directly contacting the low-temperature fluid to solidify. The molten salt goes through the shell, thereby solving the problem of molten salt scaling and reducing the frequency of pickling and descaling. In addition, the fluid entering the second heat exchange channel flows from top to bottom, and the molten salt enters the second cavity from the bottom of the second cavity. The molten salt naturally flows upward under the action of the temperature difference, and then evenly exchanges heat with the fluid in the second heat exchange channel, which is convenient for controlling the exhaust gas parameters and ensuring the stability of the exhaust gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] 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.

[0033] Figure 1 This is a schematic structural diagram of a steam generating device according to an embodiment of the present invention;

[0034] Figure 2 A front view of a steam generating device according to an embodiment of the present invention;

[0035] Figure 3 It is a structural schematic diagram of the arrangement of the first heat exchange component and the second heat exchange component in an embodiment of the present invention;

[0036] Figure 4 A front view of the arrangement of the first heat exchange component and the second heat exchange component in an embodiment of the present invention;

[0037] Figure 5 This is a schematic structural diagram of the first heat exchange component in an embodiment of the present invention.

[0038] Description of Reference Numerals

[0039] 1. Tank body; 11. Molten salt liquid supply pipeline; 12. Support seat; 13. Explosion-proof component; 14. Arc-shaped end plate; 15. Molten salt liquid outlet pipeline; 16. Partition; 2. First heat exchange component; 21. First heat exchange tube; 221. Heating tube section; 2211. Straight tube section; 2212. Bend tube section; 222. Preheating tube section; 223. Transition tube section; 3. Second heat exchange component; 31. Second heat exchange tube; 4. Pipeline. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] Combination Figures 1 to 5 As shown, the steam generating 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.

[0043] The tank 1 is formed with a first cavity and a second cavity, the bottom of the first cavity is connected to the top of the second cavity through a pipe 4, and the bottom of the second cavity is connected to a molten salt liquid supply pipe 11. The first cavity and the second cavity can be arranged in a horizontal direction. At this time, the second cavity is on one side of the first cavity, and the molten salt is injected into the second cavity through the molten salt liquid supply pipe 11, and gradually accumulates from bottom to top in the second cavity. When a certain capacity is reached, the molten salt will enter the bottom of the first cavity through the pipe 4, and gradually accumulate from bottom to top in the first cavity. Alternatively, the first cavity and the second cavity can also be arranged in a vertical direction. At this time, the second cavity is below the first cavity, and the molten salt is injected into the second cavity through the molten salt liquid supply pipe 11, and gradually accumulates from bottom to top in the second cavity. When a certain capacity is reached, the molten salt will enter the first cavity through the pipe 4 at the top of the second cavity, and gradually accumulate from bottom to top in the first cavity.

[0044] Combination Figure 3 , Figure 4 and Figure 5 As shown, the first heat exchange component 2 is arranged in the first cavity, and the first heat exchange component 2 has a liquid inlet connected to the liquid supply pipe, that is, the liquid supply pipe can transport the liquid into the first heat exchange component 2. Among them, the liquid supply pipe should be connected to a liquid supply device and other structures, so that the liquid supplied by the liquid supply device and other structures can be transported into the first heat exchange component 2. The first heat exchange component 2 is formed with a first heat exchange channel for liquid circulation inside, wherein the extension method of the first heat exchange channel is not restricted and can be designed according to actual needs. The following text of this application illustrates the extension method of the first heat exchange channel. Under this design method, the first heat exchange component 2 can exchange heat with the molten salt in the first cavity, so that the liquid flowing through the first heat exchange channel can be heated to a preset temperature and state by the molten salt. The preset state here means that the liquid after heat exchange can be in a liquid state, a gas state, or a gas-liquid mixed state.

[0045] Combination Figure 3 and Figure 4As shown, the second heat exchange component 3 is internally formed with a second heat exchange channel connected to the liquid outlet of the first heat exchange channel, that is, the fluid flowing out of the first heat exchange channel can enter the second heat exchange component 3, wherein the fluid therein can be in a liquid state, a gas state or a gas-liquid mixed state. The second heat exchange channel is extended in such a way that the fluid entering the second heat exchange channel flows from top to bottom. Among them, the specific extension method of the second heat exchange channel is not limited, and it is only necessary to ensure that the fluid in the second heat exchange channel can flow from top to bottom. The following text of this application illustrates the extension method of the second heat exchange channel. Under this design method, since the temperature of the fluid after heat exchange through the first heat exchange component 2 is relatively low when it just enters the second heat exchange component 3, and the temperature of the molten salt entering the second cavity is relatively high, therefore, under the action of the temperature difference, the molten salt should naturally flow upward so that the molten salt can fully exchange heat with the fluid in the second heat exchange channel.

[0046] The first heat exchange channel has a preheating section arranged near the liquid inlet and a heating section arranged near the liquid outlet. The proximity here refers to the proximity on the liquid flow path, not the physical structure. That is, the liquid that has just entered the first heat exchange channel enters the preheating section, and after flowing in the first heat exchange channel for a period of time and exchanging heat, the fluid will first flow through the heating section when it is about to flow out of the liquid outlet of the first heat exchange channel. In addition, the preheating section passes through the heating section so that the liquid in the preheating section can be heated by the fluid in the heating section. That is, the diameter of the heating section must be larger than the diameter of the preheating section so that the preheating section can pass through the heating section and preheat the liquid in the preheating section by the fluid in the heating section, so as to avoid the occurrence of molten salt scaling due to excessive temperature difference.

[0047] In the steam generating device provided by the present invention, when the liquid enters the first heat exchange component 2, it preferentially enters the preheating section. At this time, the liquid entering the preheating section will be preheated by the fluid in the heating section with a relatively high temperature. The preheated liquid will then exchange heat with the molten salt entering the first cavity to increase the temperature. The heated fluid passes through the heating section and enters the second heat exchange channel to avoid the molten salt directly contacting the low-temperature fluid to solidify. The molten salt goes through the shell, thereby solving the problem of molten salt scaling and reducing the frequency of pickling and descaling. In addition, the fluid entering the second heat exchange channel flows from top to bottom, and the molten salt enters the second cavity from the bottom of the second cavity. The molten salt naturally flows upward under the action of the temperature difference, and then evenly exchanges heat with the fluid in the second heat exchange channel, which is convenient for controlling the exhaust gas parameters and ensuring the stability of the exhaust gas.

[0048] Combination Figure 3 , Figure 4 and Figure 5As shown, the first heat exchange component 2 includes a first heat exchange tube 21 that is bent and extended, so that the first heat exchange tube 21 forms a serpentine shape, thereby increasing the length of the first heat exchange channel, increasing the distance that the liquid flows in the first heat exchange channel, and thus ensuring the heat exchange effect of the liquid in the first heat exchange component 2. The portion of the first heat exchange tube 21 arranged near the liquid outlet forms a heating section, and the heating section includes a plurality of heating tube sections 221. As above, the proximity here refers to the proximity on the liquid flow path, that is, close to the liquid outlet means that after the fluid flows in the first heat exchange channel for a period of time and exchanges heat, when the fluid is about to flow out of the liquid outlet of the first heat exchange channel, the portion of the first heat exchange tube 21 that the fluid passes through before flowing out is the heating section, and it does not refer to the physical structure proximity.

[0049] Among them, multiple heating pipe segments 221 are connected in sequence so that the fluid flows in one direction, and the multiple heating pipe segments 221 may be parallel to each other or not, which are not restrictive. The part of the first heat exchange tube 21 arranged near the liquid inlet forms a preheating section, and the preheating section includes multiple preheating pipe segments 222. As above, the close to the liquid inlet here means that the part of the first heat exchange tube 21 passed by the liquid just after entering the first heat exchange tube 21 is the preheating section, and does not refer to the physical proximity. Among them, multiple preheating pipe segments 222 are connected in sequence so that the fluid flows in one direction, and the multiple preheating pipe segments 222 may be parallel to each other or not, which are not restrictive. At least one preheating pipe segment 222 is provided in each heating pipe segment 221. Among them, the first heat exchange tube 21 is an integrated tubular structure, the fluid can flow unidirectionally in the first heat exchange tube 21, and the first heat exchange tube 21 is extended in such a way that the preheating tube segment 222 passes through the heating tube segment 221. At this time, fluid passes through the preheating tube segment 222, and the fluid in the preheating tube segment 222 will flow to the heating tube segment 221, so that the fluid in the preheating tube segment 222 can be preheated by the fluid in the heating tube segment 221.

[0050] The first heat exchange tube 21 of the present application is configured such that the fluid flowing into the first heat exchange tube 21 first flows from top to bottom and then flows from bottom to top. Under this design, the first heat exchange tube 21 can be evenly arranged in the first cavity, and the first heat exchange tube 21 is configured such that the arrangement position of the heating tube segment 221 and the arrangement position of the preheating tube segment 222 can both be arranged at the upper position of the first cavity, thereby enabling the preheating tube segment 222 to pass through the heating tube segment 221, so that the liquid in the preheating tube segment 222 can be preheated by the fluid in the heating tube segment 221.

[0051] In some embodiments, the first heat exchange tube 21 extends in a vertical plane so that the fluid flows only in the vertical plane. Specifically, the first heat exchange tube 21 of the first part extends in a serpentine shape from top to bottom in the vertical plane, and the liquid inlet of the first heat exchange tube 21 of the first part is at the top of the first cavity, so that the fluid flows from top to bottom, and the first heat exchange tube 21 of the second part extends from bottom to top and is connected with the first heat exchange tube 21 of the first part, so that the fluid flowing out of the first heat exchange tube 21 of the first part can enter the first heat exchange tube 21 of the second part, and flow from bottom to top in the first heat exchange tube 21 of the second part. Among them, the first heat exchange tube 21 of the second part is sleeved on the outer periphery of the first heat exchange tube 21 of the first part, so that the fluid in the first heat exchange tube 21 of the second part can preheat the fluid in the first heat exchange tube 21 of the first part.

[0052] In other embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the first heat exchange tube 21 forms a multi-layer first heat exchange tube group from top to bottom, and each layer of the first heat exchange tube group includes a plurality of first heat exchange tube bodies arranged in sequence along the horizontal direction, and the plurality of first heat exchange tube bodies are connected in sequence, and the two first heat exchange tube bodies on one side between two adjacent layers of the first heat exchange tube groups are connected, so that the fluid entering the first heat exchange tube 21 flows from the first heat exchange tube group of the upper layer to the first heat exchange tube group of the lower layer. It is worth noting that the upper layer and the lower layer here are relative to the flow direction of the fluid. For example, when the fluid flows from top to bottom, the first heat exchange tube group of the upper layer is above the first heat exchange tube group of the lower layer; when the fluid flows from bottom to top, the first heat exchange tube group of the upper layer is below the first heat exchange tube group of the lower layer.

[0053] Specifically, the difference between this design and the above-mentioned embodiment is that the first heat exchange tube 21 extends on the horizontal plane on the basis of extending on the vertical plane, so that the fluid flows in both the horizontal and vertical directions to increase the flow range of the fluid and ensure the heat exchange effect. The first heat exchange tube 21 of this design is also divided into a first part of the first heat exchange tube 21 and a second part of the first heat exchange tube 21. The first part of the first heat exchange tube 21 extends from top to bottom in a serpentine shape in the vertical plane, and the liquid inlet of the first part of the first heat exchange tube 21 is at the top of the first cavity, so that the fluid flows from top to bottom. In addition, the first part of the first heat exchange tube 21 forms a multi-layer first heat exchange tube group in the vertical plane, and each layer of the first heat exchange tube group includes a plurality of first heat exchange tube bodies arranged in sequence along the horizontal direction. When in use, the liquid first enters the first heat exchange tube group of the top layer, and flows in sequence in the plurality of first heat exchange tube bodies along the horizontal direction, and then enters the first heat exchange tube group of the second layer below it, and so on, until it flows into the first heat exchange tube group at the bottom.

[0054] The first heat exchange tube 21 of the second part extends from bottom to top and is connected with the first heat exchange tube 21 of the first part, so that the fluid flowing out through the first heat exchange tube 21 of the first part (the first heat exchange tube body of the first heat exchange tube group at the bottom) can enter the first heat exchange tube 21 of the second part and flow from bottom to top in the first heat exchange tube 21 of the second part. In addition, the first heat exchange tube 21 of the second part forms a multi-layer first heat exchange tube group in a vertical plane, and each layer of the first heat exchange tube group includes a plurality of first heat exchange tube bodies arranged in sequence along the horizontal direction. When in use, the fluid flowing out through the first heat exchange tube 21 of the first part first enters the first heat exchange tube group of the bottom layer, and flows in sequence in the plurality of first heat exchange tube bodies of the layer along the horizontal direction, and then enters the first heat exchange tube group of the second layer above it, and so on, until it flows into the first heat exchange tube group at the top. Among them, the multiple first heat exchange tube bodies in the second part of the first heat exchange tube 21 are arranged on the outer periphery of the multiple first heat exchange tube bodies in the first part of the first heat exchange tube 21, so that the fluid in the first heat exchange tube body in the second part of the first heat exchange tube 21 can preheat the fluid in the first heat exchange tube body in the first part of the first heat exchange tube 21.

[0055] Among them, in the first heat exchange tube 21 of the first part, at least part of the first heat exchange tube body serves as the above-mentioned preheating tube segment 222, and in the second part of the first heat exchange tube 21, at least part of the first heat exchange tube body serves as the above-mentioned heating tube segment 221. In addition, the heat pipe segment is penetrated through the heating tube segment 221, so that the fluid in the preheating tube segment 222 is heated by the fluid in the heating tube segment 221.

[0056] As a feasible implementation method, Figure 5 As shown, the heating pipe section 221 includes a straight pipe section 2211 and a curved pipe section 2212 for connecting two adjacent straight pipe sections 2211, wherein the diameter of the curved pipe section 2212 is smaller than the diameter of the straight pipe section 2211. Specifically, a plurality of straight pipe sections 2211 are parallel to each other to reduce space occupation, and the curved pipe section 2212 adopts a 180° elbow, and the curved pipe section 2212 is used to connect adjacent straight pipe sections 2211, so that a plurality of straight pipe sections 2211 and a plurality of curved pipe sections 2212 form a snake shape. Moreover, the arrangement mode in which the diameter of the curved pipe section 2212 is smaller than that of the straight pipe section 2211 makes the diameter at the connection position of the straight pipe section 2211 smaller, thereby reducing space occupation. Among them, the curved pipe section 2212 and the straight pipe section 2211 can be connected by welding to increase the firmness of the connection.

[0057] The setting method of the curved pipe section 2212 of the present application is not limited. For example, the curved pipe section 2212 can be a full-diameter elbow (the sizes of each position are adapted). In this case, end plates can be respectively set at both ends of the straight pipe section 2211, and the ends of the curved pipe section 2212 are connected to the end plates, and holes are opened at the connection positions between the end plates and the curved pipe section 2212, so that the fluid can enter the straight pipe section 2211 through the curved pipe section 2212. Under this design method, multiple preheating pipe sections 222 that penetrate the heating pipe section 221 can all pass through the curved pipe section 2212 to enter the straight pipe section 2211, or part of the preheating pipe sections 222 can pass through the curved pipe section 2212 to enter the straight pipe section 2211, and the other part of the preheating pipe sections 222 can pass through the end plates directly to enter the straight pipe section 2211.

[0058] Alternatively, the curved pipe section 2212 and the straight pipe section 2211 have a smooth transition. That is, the two ends of the curved pipe section 2212 are expanded outward, so that the diameter of the curved pipe section 2212 gradually increases toward its end. In this case, end plates can be respectively provided at both ends of the straight pipe section 2211, and the ends of the curved pipe section 2212 are connected to the end plates, and holes are opened at the connection positions between the end plates and the curved pipe section 2212, so that the fluid can enter the straight pipe section 2211 through the curved pipe section 2212, and the inflow or outflow of the fluid can be transitioned under the effect of the expansion, thereby ensuring the stability of the fluid flow.

[0059] Under this design, the preheating pipe section 222 passing through the heating pipe section 221 can all pass through the curved pipe section 2212 to enter the straight pipe section 2211, or part of the preheating pipe section 222 can pass through the curved pipe section 2212 to enter the straight pipe section 2211, and the other part of the preheating pipe section 222 can pass through the end plate directly into the straight pipe section 2211.

[0060] Alternatively, the two ends of the curved pipe section 2212 are expanded outward, so that the diameter of the curved pipe section 2212 gradually increases toward its end, and the diameter of the expanded end of the curved pipe section 2212 is consistent with the end diameter of the straight pipe section 2211, so that the curved pipe section 2212 can be directly connected to the straight pipe section 2211, increasing the structural strength and making the flow of the fluid more stable. In this design, the preheating section that passes through the heating pipe section 221 should all pass through the curved pipe section 2212.

[0061] As a feasible implementation method, Figure 5As shown, three preheating pipe segments 222 are inserted into each heating pipe segment 221, and the three preheating pipe segments 222 are evenly distributed in the heating pipe segment 221. Under this design, the three preheating pipe segments 222 are arranged in an equilateral triangle, so as to reasonably utilize the internal space of the heating pipe segment 221 and ensure the heat exchange effect of the fluid. Among them, the three preheating pipe segments 222 can all pass through the curved pipe segment 2212 of the heating pipe segment 221 to enter the straight pipe segment 2211 of the heating pipe segment 221. Alternatively, one of the preheating pipe segments 222 shuttles through the curved pipe segment 2212 of the heating pipe segment 221, and the other two preheating pipe segments 222 pass through the end plate of the heating pipe segment 221. It can be seen that the insertion method of multiple preheating pipe segments 222 is not limited and can be designed according to the actual layout of the heating pipe segment 221.

[0062] It is understandable that each heating pipe segment 221 of the present application may also pass through one preheating pipe segment 222, two preheating pipe segments 222 or four preheating pipe segments 222, etc. These are not restrictive, that is, the specific number of preheating pipe segments 222 can be designed according to actual needs.

[0063] In some embodiments, the first heat exchange tubes 21 of the first part of the present application are all arranged in the first heat exchange tubes 21 of the second part, so that the fluid in the first heat exchange tubes 21 of the second part exchanges heat with the molten salt in the first cavity, and the fluid in the first heat exchange tubes 21 of the first part exchanges heat with the fluid in the first heat exchange tubes 21 of the second part.

[0064] In other embodiments, in combination Figures 3 to 5 As shown, the first heat exchange tube 21 also includes a transition section arranged outside the heating tube section 221. In this design, the first heat exchange tube 21 of the first part of the above-mentioned part is inserted into the first heat exchange tube 21 of the second part, so that the fluid in the first heat exchange tube 21 of the second part exchanges heat with the molten salt in the first cavity, and the fluid in the first heat exchange tube 21 of the first part exchanges heat with the fluid in the first heat exchange tube 21 of the second part. In addition, the remaining first heat exchange tube 21 forms a transition section, and the transition section directly exchanges heat with the molten salt in the first cavity.

[0065] Under this design, since the first heat exchange tube 21 of the first part shuttling between the first part and the second part can be preheated by the fluid, the temperature difference between the fluid flowing into the transition section and the molten salt in the first cavity can be reduced, thereby avoiding structural phenomena. The fluid in the transition section directly exchanges heat with the molten salt, which can also ensure the heat exchange effect of the fluid in the transition section, so that the fluid entering the heating pipe section 221 can preheat the fluid in the preheating pipe section 222.

[0066] Specifically, the transition section includes a plurality of transition pipe sections 223, and the diameter of the transition pipe section 223 is the same as the diameter of the preheating pipe section 222. The extension of the plurality of transition pipe sections 223 makes the transition section form a snake shape, so as to increase the length of the transition section, thereby increasing the flow path of the fluid in the transition section, and ensuring the heat exchange effect of the fluid in the transition section. In addition, the diameter of the transition pipe section 223 is the same as the diameter of the preheating pipe section 222, so that the fluid flows smoothly in the preheating pipe section 222 and the transition pipe section 223. In addition, the diameter of the transition pipe section should be smaller than the diameter of the heating pipe section 221, so that the heating pipe section 221 can be sleeved on the outer periphery of the preheating pipe section 222.

[0067] Further optimized, the transition section is located below the heating tube section 221 and the preheating tube section 222. This design method is adapted to the design requirement that the first heat exchange tube 21 is configured such that the fluid flowing into the first heat exchange tube 21 flows from top to bottom first and then from bottom to top, making the space utilization in the first cavity more reasonable.

[0068] The liquid supply pipeline is used to supply softened sewage toward the first heat exchange component 2. The steam generating device provided in the present application utilizes off-peak electricity to heat molten salt. The high-temperature molten salt generates direct current steam by heat exchange with softened sewage dedicated to steam injection. The setting of the steam generating device (preheating first, then heating) can adapt to the sewage characteristics of softened sewage, avoid the scaling of molten salt, effectively ensure the service life of the steam generating device, and reduce the frequency of pickling and descaling of the steam generating device, thereby increasing the sewage conversion efficiency. That is, the steam generator of this design method is suitable for special water quality, which solves the problem of "not being able to adapt to local conditions" of traditional heat exchangers.

[0069] The connection position between the first heat exchange channel and the second heat exchange channel of the present application is located at the top of the second cavity. This design allows the fluid flowing out of the first heat exchange channel to flow into the top of the second heat exchange channel, so as to flow from top to bottom in the second heat exchange channel, so that the molten salt naturally flows upward under the action of the temperature difference, and then evenly exchanges heat with the fluid in the second heat exchange channel.

[0070] In some embodiments, the liquid outlet of the first heat exchange channel may be at the bottom of the first cavity. In this case, the liquid outlet of the first heat exchange channel may be connected to the liquid inlet of the second heat exchange channel through a guide tube, so that the connecting position between the first heat exchange channel and the second heat exchange channel is located at the top of the second cavity.

[0071] In other embodiments, the liquid outlet of the first heat exchange channel may be at the top of the first cavity. In this case, the liquid outlet of the first heat exchange channel may be directly connected to the liquid inlet of the second heat exchange channel, thereby making the connecting position between the first heat exchange channel and the second heat exchange channel located at the top of the second cavity.

[0072] It can be seen that in the present application, the position of the liquid outlet of the first heat exchange channel is not restricted and can be designed according to actual needs. It only needs to ensure that the connecting position between the first heat exchange channel and the second heat exchange channel is located at the top of the second cavity.

[0073] Combination Figure 1 and Figure 2 As shown, the tank body 1 is a horizontal cylindrical structure, so that a first cavity and a second cavity are formed horizontally inside the tank body 1. A support base 12 for supporting the tank body 1 is provided at the bottom of the tank body 1, so that the tank body 1 can be supported at a designated position by the support base 12, which is convenient for placing the tank body 1.

[0074] As a feasible implementation, the support seat 12 can be a double saddle seat, such as Figure 2 As shown, the double saddle includes an arc-shaped plate arranged at the bottom of the tank body 1, and the curvature of the arc-shaped plate matches the curvature of the tank body 1, so that the arc-shaped plate can completely fit the bottom of the tank body 1. A support is provided at the bottom of the arc-shaped plate, the support is connected to the arc-shaped plate, and the bottom of the support is a plane structure, so that the support can be supported on a supporting plane.

[0075] Combination Figure 3 and Figure 4 As shown, the second heat exchange assembly 3 includes a bent and extended second heat exchange tube 31, so that the second heat exchange tube 31 forms a serpentine shape, thereby increasing the length of the second heat exchange channel, increasing the distance that the fluid flows in the second heat exchange channel, and thereby ensuring the heat exchange effect of the fluid in the second heat exchange assembly 3. And the second heat exchange tube 31 is bent and extended from top to bottom. Under this design, the second heat exchange tube 31 can be evenly arranged in the second cavity, and the fluid entering the second heat exchange tube 31 can flow from top to bottom, and the molten salt in the second cavity naturally flows up under the temperature difference, so that the fluid in the second heat exchange tube 31 and the molten salt in the second cavity are evenly exchanged.

[0076] In some embodiments, the second heat exchange tube 31 extends in a vertical plane, so that the fluid flows only in the vertical plane.

[0077] In other embodiments, the second heat exchange tube 31 forms a multi-layer second heat exchange tube group from top to bottom, and each layer of the second heat exchange tube group includes a plurality of second heat exchange tube bodies arranged in sequence along the horizontal direction, the plurality of second heat exchange tube bodies are connected in sequence, and the two second heat exchange tube bodies on one side between two adjacent layers of the second heat exchange tube groups are connected, so that the fluid entering the second heat exchange tube 31 flows from the second heat exchange tube group of the upper layer to the second heat exchange tube group of the next layer.

[0078] Specifically, the difference between this design and the above-mentioned embodiment is that the second heat exchange tube 31 extends on the horizontal plane in addition to the vertical plane, so that the fluid flows in both the horizontal and vertical directions to increase the flow range of the fluid and ensure the heat exchange effect. When in use, the fluid first enters the second heat exchange tube group on the top layer, and flows in the multiple second heat exchange tube bodies in sequence along the horizontal direction, and then enters the second heat exchange tube group on the second layer below it, and so on, until it flows into the second heat exchange tube group on the bottom.

[0079] In order to increase the safety of use, the tank body 1 is provided with an explosion-proof component 13 which is connected to the first cavity and the second cavity respectively. The explosion-proof component 13 is configured to be opened when the internal pressure of the first cavity or the second cavity is greater than the preset pressure, so as to achieve the pressure relief of the tank body 1, avoid the phenomenon of the tank body 1 bursting due to excessive pressure inside the tank body 1, and increase the safety of the tank body 1 in use.

[0080] As a feasible implementation, the explosion-proof component 13 can be a bursting disc arranged on the tank body 1, which can break to relieve pressure after the internal pressure of the tank body 1 reaches a preset pressure. The bursting disc is a conventional design in the explosion-proof field, and its structure and working principle are not described in detail here.

[0081] It is understandable that the explosion-proof component 13 of the present application may also adopt other existing structures according to usage requirements, as long as the explosion-proof component 13 can achieve an explosion-proof effect.

[0082] The two ends of the tank body 1 of the present application are respectively sealed by arc-shaped end plates 14. The arc-shaped end plates 14 can increase the internal space of the tank body 1. At the same time, since elbows are provided at the bending positions of the first heat exchange tube 21 and the second heat exchange tube 31, the arc-shaped end plates 14 can be used to avoid the elbows, so as not to affect the installation of the first heat exchange tube 21 and the second heat exchange tube 31.

[0083] A molten salt outlet pipe 15 connected to the first cavity is provided at the top of the tank body 1. After the molten salt enters the first cavity, it will accumulate upward from the bottom of the first cavity, and finally flow out to a designated position through the molten salt outlet pipe 15 at the top of the first cavity, ensuring that the flow path of the molten salt is maximized and increasing the heat exchange effect between the molten salt and the liquid.

[0084] Combination Figure 3 and Figure 4As shown, the first cavity and the second cavity of the present application are separated by a partition 16, one end of the pipe 4 is located at the top of the second cavity, and the other end passes through the partition 16 and extends to the bottom of the first cavity. In this design, by setting the partition 16, the isolation effect between the first cavity and the second cavity can be increased, so that the molten salt in the second cavity can enter the bottom of the first cavity through the pipe 4 after filling the second cavity, ensuring that the heat exchange in the first cavity and the second cavity is carried out separately to meet the heat exchange requirements.

[0085] The steam generating device of the present application takes into account the corrosiveness of chloride ions in the water quality and the economy of material selection, and chooses to let the molten salt go through the shell side, with a design pressure of 0.5-0.7MPa, preferably 0.6MPa, and a design temperature of 550-600℃, preferably 575℃. The shell material is S34779 steel plate, which has ideal high-temperature mechanical properties and stability. The tube side (the first heat exchange tube 21 and the second heat exchange tube 31) passes softened sewage, with a design pressure of 9-11MPa, preferably 10MPa, and a design temperature of 350-390℃, preferably 370℃. The material of the heat exchange tube is 12Cr1MoVG. The tube side is welded by steel pipes and fittings of two specifications, DN65 and DN250.

[0086] In the steam generating device under this design mode, the heat exchange of softened sewage is divided into three stages, including the preheating stage and the heating stage in the first cavity, and the evaporation stage in the second cavity. Among them, the molten salt flows from the second cavity to the first cavity. Therefore, the temperature of the molten salt in the second cavity is higher than the temperature of the molten salt in the first cavity. The softened sewage is preheated and heated in the first cavity with a relatively low temperature to avoid the scaling of the molten salt caused by the large temperature difference. The softened sewage (gaseous or a mixed state of liquid and gas) reaching a certain temperature enters the second cavity to be heated to a preset temperature by the molten salt in the second cavity and then discharged.

[0087] Among them, the diameter of the preheating tube section 222 of the first heat exchange tube 21 is 50-80, preferably 65; the diameter of the heating tube section 221 of the first heat exchange tube 21 is 200-300, preferably 250; the diameter of the curved tube section 2212 of the first heat exchange tube 21 is 100-200, preferably 150.

[0088] The process flow of the steam generating device provided by the present invention is as follows:

[0089] First, the flow state of molten salt is described:

[0090] The molten salt produced by electric heating in the valley (about 560℃) is transmitted to the steam generating device through the booster pump in the high-temperature molten salt storage tank. The high-temperature molten salt naturally flows upward under the action of the temperature difference and fully exchanges heat with the wet steam in the second heat exchange component 3 (heated to this state by the first heat exchange component 2). When the molten salt fills the second cavity, it enters the bottom of the first cavity through the pipe 4 and gradually accumulates in the first cavity. At this time, the molten salt fully exchanges heat with the softened sewage in the first heat exchange component 2, and finally flows into the low-temperature molten salt storage tank (the molten salt is about 285℃) from the molten salt outlet pipe 15 at the top of the first cavity.

[0091] Secondly, the flow state of softened sewage is described:

[0092] The softened sewage (about 56°C) in the water tank is pumped into the steam generating device through a plunger pump. The softened sewage first enters the preheating section of the first heat exchange component 2 and flows in a serpentine manner in the preheating section. Since the preheating section passes through the heating section, the liquid in the preheating section will be preheated by the fluid in the heating section. At this time, the fluid in the heating section and the liquid in the preheating section are forced to exchange heat by convection to ensure the heat exchange effect. The preheated liquid will flow to the transition section, which will directly exchange heat with the molten salt in the first cavity. After the heat exchange and heating, when the temperature of the fluid exceeds the melting point of the molten salt (above 150-200°C), the fluid enters the heating section. At this time, the fluid in the heating section and the low-temperature water in the preheating section and the molten salt in the first cavity perform double heat exchange, so that the softened sewage is continuously heated to a saturated state. The fluid flowing out of the heating section enters the second heat exchange component 3, where vaporization begins. The fluid is continuously heat exchanged by the high-temperature molten salt in the second heat exchange component 3, and finally forms direct steam with a suitable dryness (80%). The direct steam is directly transported to the steam injection well. Among them, natural convection in a countercurrent state is carried out in the second cavity, and low-flow natural convection heat transfer is adopted, which reduces the complexity and maintenance cost of the molten salt energy storage system.

[0093] At the same time, after sufficient heat exchange with the internal molten salt, direct steam is generated and directly transported to the steam injection well. Since the amount of steam transported by this application is greater than the demand of the steam injection well, part of the steam needs to be diverted according to the steam injection demand at the wellhead, that is, part of the steam is transported to the steam injection well, and the other part of the diverted steam is fully liquefied in the expansion tank and then transported to the water tank by a centrifugal pump, and the cycle is repeated.

[0094] The steam generating device provided by the present invention integrates multiple different stages such as preheating, heating, and evaporation in the heat exchange process of softened sewage into one device, realizing the multi-process integration of the steam generating device, and can be skid-mounted to improve the construction quality, reduce construction investment, improve operation efficiency and transportation convenience, and can be reused according to development requirements, and finally achieve rapid production. And the steam generating device of this design solves the solidification problem of molten salt in direct contact with cold water (water temperature below the melting point of molten salt) in the steam generator, and optimizes the heat transfer efficiency, better adapts to high hardness and high corrosion water conditions, solves the problem of scale and corrosion of heat exchange tubes, improves the durability of equipment, and extends service life. In addition, the invention can cooperate with molten salt energy storage technology. Due to the high heat capacity, wide temperature range, low volatility and recyclability of the molten salt itself, the use of molten salt as a medium to participate in oilfield thermal recovery steam injection itself has better environmental advantages, effectively reducing the carbon emissions associated with the wet steam generation process of heavy oil heat, and reducing production costs. In addition, the present invention can generate direct-flow steam that can be directly introduced into a steam injection well, has better convenience, improves the utilization effect of steam and reduces energy waste.

[0095] 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.

[0096] 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 invented herein.

Claims

1. A steam generating device, characterized in that: include: A tank body (1) is formed with a first cavity and a second cavity therein, the bottom of the first cavity is connected to the top of the second cavity via a pipe (4), and the bottom of the second cavity is connected to a molten salt liquid supply pipe (11); A first heat exchange component (2) is arranged in the first cavity, the first heat exchange component (2) has a liquid inlet connected to the liquid supply pipeline, and a first heat exchange channel for liquid circulation is formed inside the first heat exchange component (2); A second heat exchange component (3) is formed with a second heat exchange channel in the interior thereof, which is in communication with the liquid outlet of the first heat exchange channel, and the second heat exchange channel is extended in such a manner that the fluid entering the second heat exchange channel flows from top to bottom; Wherein, the first heat exchange channel has a preheating section arranged near the liquid inlet and a heating section arranged near the liquid outlet, and the preheating section passes through the heating section so that the liquid in the preheating section can be heated by the fluid in the heating section.

2. The steam generating device according to claim 1, characterized in that: The first heat exchange component (2) comprises a bent and extended first heat exchange tube (21), a portion of the first heat exchange tube (21) arranged near the liquid outlet forms the heating section, and the heating section comprises a plurality of heating tube sections (221), and a portion of the first heat exchange tube (21) arranged near the liquid inlet forms the preheating section, and the preheating section comprises a plurality of preheating tube sections (222), and at least one preheating tube section (222) is inserted into each of the heating tube sections (221).

3. The steam generating device according to claim 2, characterized in that: The first heat exchange tube (21) is configured such that the fluid flowing into the first heat exchange tube (21) first flows from top to bottom and then flows from bottom to top.

4. The steam generating device according to claim 3, characterized in that: The first heat exchange tubes (21) form a multi-layer first heat exchange tube group from top to bottom, and each layer of the first heat exchange tube group includes a plurality of first heat exchange tube bodies arranged in sequence along the horizontal direction, so that the fluid entering the first heat exchange tube (21) flows from the first heat exchange tube group of the upper layer to the first heat exchange tube group of the next layer.

5. The steam generating device according to claim 2, characterized in that: The heating pipe section (221) comprises a straight pipe section (2211) and a curved pipe section (2212) for connecting two adjacent straight pipe sections (2211), wherein the diameter of the curved pipe section (2212) is smaller than the diameter of the straight pipe section (2211).

6. The steam generating device according to claim 5, characterized in that: The curved pipe section (2212) and the straight pipe section (2211) transition smoothly.

7. The steam generating device according to claim 5, characterized in that: Three preheating pipe sections (222) are inserted into each heating pipe section (221), and the three preheating pipe sections (222) are evenly distributed in the heating pipe section (221).

8. The steam generating device according to claim 7, characterized in that: One of the preheating pipe sections (222) shuttles through the curved pipe section (2212).

9. The steam generating device according to claim 2, characterized in that: The first heat exchange tube (21) further comprises a transition section arranged outside the heating tube section (221).

10. The steam generating device according to claim 9, characterized in that: The transition section is located below the heating pipe section (221) and the preheating pipe section (222).

11. The steam generating device according to claim 9, characterized in that: The transition section comprises a plurality of transition pipe sections (223), and the diameter of the transition pipe section (223) is the same as the diameter of the preheating pipe section (222).

12. The steam generating device according to claim 1, characterized in that: The liquid supply pipeline is used to provide softened sewage toward the first heat exchange component (2).

13. The steam generating device according to claim 1, characterized in that: The communication position between the first heat exchange channel and the second heat exchange channel is located at the top of the second cavity.

14. The steam generating device according to claim 1, characterized in that: The tank body (1) is a horizontal cylindrical structure, and a support seat (12) for supporting the tank body (1) is provided at the bottom of the tank body (1).

15. The steam generating device according to claim 1, characterized in that: The second heat exchange component (3) comprises a second heat exchange tube (31) that bends and extends, and the second heat exchange tube (31) bends and extends from top to bottom.

16. The steam generating device according to claim 15, characterized in that: The second heat exchange tubes (31) form a multi-layer second heat exchange tube group from top to bottom, and each layer of the second heat exchange tube group includes a plurality of second heat exchange tube bodies arranged in sequence along the horizontal direction, so that the fluid entering the second heat exchange tube (31) flows from the second heat exchange tube group of the upper layer to the second heat exchange tube group of the next layer.

17. The steam generating device according to claim 1, characterized in that: The tank body (1) is provided with an explosion-proof component (13) which is in communication with the first cavity and the second cavity respectively.

18. The steam generating device according to claim 1, characterized in that: Both ends of the tank body (1) are sealed by arc-shaped end plates (14) respectively.

19. The steam generating device according to claim 1, characterized in that: The top of the tank body (1) is provided with a molten salt liquid outlet pipe (15) which is in communication with the first cavity.

20. The steam generating device according to claim 1, characterized in that: The first cavity and the second cavity are separated by a partition (16); one end of the pipe (4) is located at the top of the second cavity, and the other end passes through the partition (16) and extends into the bottom of the first cavity.

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