Steam generator using solid heat storage

Abstract

The application provides a steam generator utilizing solid heat storage, and belongs to the technical field of solid heat storage utilization. The steam generator utilizing solid heat storage comprises a solid heat storage device, the solid heat storage device has a circulating channel; a heat exchange assembly is arranged in the circulating channel, the heat exchange assembly is provided with an airflow gap channel and a water channel in communication with the circulating channel; a water tank is arranged, the water outlet of the water tank is in communication with the water channel; and a gas-water separator is arranged, the inlet of the gas-water separator is in communication with the other end of the water channel, and the cylinder body is provided with a steam outlet; wherein the flow passage cross-sectional area of the airflow gap channel gradually decreases in the airflow flow direction in the circulating channel.

Description

Technical Field

[0001] This invention belongs to the field of solid thermal energy storage technology, and in particular, a steam generator that utilizes solid thermal energy storage. Background Technology

[0002] Solid thermal energy storage is commonly used in the field of steam utilization. It involves storing heat in a fixed thermal storage body in advance, and when needed, the heat is extracted from the fixed thermal storage body and exchanged with water to form steam or hot water for use.

[0003] The heat exchange efficiency is related to the temperature difference and the air velocity. When heated air passes through the heat exchanger, it transfers heat into the water. However, since the heat of the solid heat storage body is limited, the heat in the solid heat storage body decreases during use, causing the air inside the entire circulation channel to gradually cool down. The air in the circulation channel begins to contract, which causes the flow rate through the heat exchanger to decrease, thereby reducing the heat exchange efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a steam generator that utilizes solid thermal storage. This solves the problems of reduced heat in the solid thermal storage body, decreased temperature of the circulating air, reduced total air volume, and reduced air velocity as the air passes through the heat exchanger.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A steam generator utilizing solid thermal storage, characterized in that it includes:

[0007] A solid thermal storage device, wherein the solid thermal storage device has a circulation channel;

[0008] A heat exchange assembly is disposed within a circulation channel, and the heat exchange assembly has an airflow gap channel and a water channel communicating with the circulation channel;

[0009] A water tank, wherein the outlet of the water tank is connected to the water passage; and

[0010] A gas-water separator, wherein the inlet of the gas-water separator is connected to the other end of the water passage, and the cylinder has a steam outlet;

[0011] In the circulation channel, the airflow flows upward, and the cross-sectional area of ​​the airflow gap channel decreases sequentially.

[0012] In the aforementioned steam generator utilizing solid thermal storage, the heat exchange assembly includes at least two heat exchange structures, the heat exchange structures including...

[0013] Housing, the housing having a channel;

[0014] A first heat exchange tube, disposed within the channel, the first heat exchange tube comprising at least one first planar spiral tube segment; and

[0015] The second heat exchange tube is disposed in the channel. The second heat exchange tube includes at least one second planar spiral tube segment. The second planar spiral tube segment is interlocked with the first planar spiral tube segment, and the airflow gap channel is formed between the first planar spiral tube segment and the second planar spiral tube segment.

[0016] The first heat exchange tube and the second heat exchange tube serve as the water passage.

[0017] In the aforementioned steam generator utilizing solid thermal storage, the inner and / or outer rings of the shell are provided with a thermal insulation layer.

[0018] In the steam generator that utilizes solid thermal storage described above, the first planar spiral tube and the second planar spiral tube are fixedly connected by a positioning clamp.

[0019] In the above-mentioned steam generator utilizing solid thermal storage, a spacer layer is provided between the inner wall of the channel and the first heat exchange tube or the second heat exchange tube, and the spacer layer is used to fix the first heat exchange tube and the second heat exchange tube.

[0020] The steam generator utilizing solid thermal storage described above also includes a column, with an empty channel formed between the first planar spiral tube and the second planar spiral tube, and the column is disposed within the empty channel.

[0021] In the aforementioned steam generator utilizing solid thermal storage, the center lines of the first planar spiral tube and the second planar spiral tube, which are interlocked, are approximately located in the same plane.

[0022] In the aforementioned steam generator utilizing solid thermal storage, adjacent first planar spiral tube sections abut against each other, and adjacent second planar spiral tube sections abut against each other.

[0023] The steam generator utilizing solid thermal storage described above also includes a three-way pipe and a feed pump. The outlet of the water tank is connected to both the water channel and the outlet of the gas-water separator via the three-way pipe. The three-way pipe has a first pipe connecting to the water tank, a second pipe connecting to the water channel, and a third pipe connecting to the outlet of the gas-water separator. The feed pump is located on the second pipe.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] In this application, a design is adopted in which the flow cross-sectional area of ​​the airflow gap channel decreases sequentially in the direction of airflow in the circulation channel. After the airflow flows into the airflow gap channel, the subsequent flow cross-section becomes smaller, so that even after the air temperature decreases and the volume decreases, sufficient flow velocity can be guaranteed, thereby maintaining the heat exchange efficiency of water. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a structure in this application;

[0027] Figure 2 This is a schematic diagram of one possible heat exchange structure in this application;

[0028] Figure 3 This is a side view of one of the heat exchange structures in this application;

[0029] Figure 4 This is a schematic diagram of one structure of the first heat exchange tube and the second heat exchange tube in this application.

[0030] In the picture,

[0031] 2. Solid thermal storage device; 21. Circulation channel; 22. Housing; 23. Circulation fan; 24. Thermal storage material;

[0032] 3. Heat exchange assembly; 31. Heat exchange structure; 311. Shell; 312. First heat exchange tube; 3121. First planar spiral tube segment; 313. Second heat exchange tube; 3131. Second planar spiral tube segment; 314. Airflow gap channel; 315. Insulation layer; 316. Positioning clip; 317. Spacer layer; 318. Column;

[0033] 4. Water tank;

[0034] 5. Gas-water separator;

[0035] 6. Three-way branching pipeline; 61. First pipeline; 62. Second pipeline; 63. Third pipeline;

[0036] 7. Water pump. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] Figure 1 In the image, the arrow located in the solid thermal storage device indicates the direction of airflow.

[0039] Figure 1 In the image, the arrow located on the fixed thermal storage device indicates the direction of water flow.

[0040] like Figures 1 to 4 As shown, a steam generator utilizing solid thermal storage includes a solid thermal storage device 2, a heat exchange assembly 3, a water tank 4, and a gas-water separator 5. The solid thermal storage device 2 has a circulation channel 21. The heat exchange assembly 3 is disposed within the circulation channel 21 and has an airflow gap channel 314 and a water channel communicating with the circulation channel 21. The outlet of the water tank 4 is connected to the water channel. The inlet of the gas-water separator 5 is connected to the other end of the water channel, and the gas-water separator 5 has a steam outlet. In the circulation channel 21, the airflow flows upward, and the cross-sectional area of ​​the airflow gap channel 314 decreases sequentially.

[0041] In this application, water from water tank 4 is input into the water channel, and the heat stored in solid heat storage device 2 is used to heat the water in the water channel through heat exchange components, so that the water is heated into a steam-water mixture. Then the steam-water mixture is input into the steam-water separator, and the steam and saturated water are separated by the steam-water separator. The steam is output from the steam outlet of the steam-water separator 5 for use.

[0042] After the solid heat storage device 2 continuously heats the water in the water channel for a period of time, the heat stored in the solid heat storage device 2 decreases, the temperature difference between the hot air and the heat exchange component 3 becomes smaller, and at the same time, the temperature of the circulating air in the circulation channel 21 decreases and the volume shrinks, resulting in a decrease in the airflow velocity through the airflow gap channel 314, which affects the heat exchange efficiency.

[0043] In this application, a design is adopted in which the cross-sectional area of ​​the airflow gap channel 314 decreases sequentially in the direction of airflow in the circulation channel 21. After the airflow flows into the airflow gap channel 314, the subsequent cross-sectional area becomes smaller, so that even after the air temperature decreases and the volume decreases, sufficient flow velocity can be guaranteed, thereby maintaining the heat exchange efficiency of water.

[0044] In the airflow direction of the circulation channel 21, the flow cross-sectional area of ​​the airflow gap channel 314 decreases sequentially. This includes two cases: first, the flow cross-sectional area of ​​the airflow gap channel 314 decreases in a step-like manner; second, the flow cross-sectional area of ​​the airflow gap channel 314 decreases linearly. In this embodiment, the flow cross-sectional area of ​​the airflow gap channel 314 decreases in a step-like manner, which is more convenient for processing the heat exchange component 3.

[0045] In this embodiment, the solid thermal storage device 2 further includes a housing 22, a circulating fan 23, and a heat storage material 24. A circulation channel 21 is located inside the housing 22, and the circulating fan 23, the heat storage material 24, and the heat exchange assembly 3 are arranged inside the circulation channel 21. The circulating fan 23 circulates the air in the circulation channel 21. The air is heated after passing through the heat storage material 24, and the hot air is used to heat water through the heat exchange assembly 3.

[0046] Specifically, the heat exchange assembly 3 includes at least two heat exchange structures 31. Each heat exchange structure 31 includes a shell 311, a first heat exchange tube 312, and a second heat exchange tube 313. The shell 311 has a channel. The first heat exchange tube 312 is disposed within the channel and includes at least one first planar spiral tube segment 3121. The second heat exchange tube 313 is disposed within the channel and includes at least one second planar spiral tube segment 3131. The second planar spiral tube segment 3131 and the first planar spiral tube segment 3121 are interlocked, and the airflow gap channel 314 is formed between the first planar spiral tube segment 3121 and the second planar spiral tube segment 3131. The first heat exchange tube 312 and the second heat exchange tube 313 serve as the water channel.

[0047] Preferably, the first heat exchange tube 312 and the second heat exchange tube 313 are made of copper.

[0048] In this application, hot air is introduced from one end of the channel of the shell 311, and air is discharged from the other end of the channel. At the same time, water is introduced into the first heat exchange tube 312 and the second heat exchange tube 313. The introduced airflow passes through the airflow gap channel 314 between the first planar spiral tube section 3121 and the second planar spiral tube section 3131. The high-temperature gas will rapidly heat the water introduced into the first heat exchange tube 312 and the second heat exchange tube 313.

[0049] In this application, a structure in which the second planar spiral tube segment 3131 and the first planar spiral tube segment 3121 are interlocked is adopted. Compared with the traditional single spiral heat exchange tube, the present application has a longer pipe per unit volume, thereby increasing the heat exchange area and improving the heat exchange efficiency. At the same time, due to this design, the water flow path is also extended, so that the water can absorb enough heat in the shell 311, thus accelerating the water heating efficiency.

[0050] When multiple first planar spiral pipe sections 3121 and multiple second planar spiral pipe sections 3131 are provided, the number of first planar spiral pipe sections 3121 and second planar spiral pipe sections 3131 is preferably the same. Multiple first planar spiral pipe sections 3121 are arranged side-by-side, and multiple second planar spiral pipe sections are arranged side-by-side.

[0051] The size of the airflow gap channel 314 between the first planar spiral tube section 3121 and the second planar spiral tube section 3131 is adjusted according to the actual application scenario. For example, in this embodiment, the flow cross-sectional area of ​​the airflow gap channel 314 is made such that the flow cross-sectional area of ​​the airflow gap channel 314 decreases sequentially along the airflow direction.

[0052] In addition, the first heat exchange tube 312 can be designed as a series of multiple first planar spiral tube segments 3121, and the second heat exchange tube 313 can be designed as a series of multiple second planar spiral tube segments 3131.

[0053] Specifically, the inner and / or outer rings of the housing 311 are provided with a heat insulation layer 315.

[0054] In this application, the inner ring of the shell 311 has a thermal insulation layer 315, or the outer ring of the shell 311 has a thermal insulation layer 315, or both the inner and outer rings of the shell 311 have thermal insulation layers 315. Common thermal insulation materials can be used for the thermal insulation layer 315. The shell 311 is a steel-structured cylindrical shell. In this embodiment, the inner ring of the shell 311 has a thermal insulation layer 315.

[0055] Specifically, the first planar spiral tube and the second planar spiral tube are fixedly connected by a positioning clamp 316.

[0056] The positioning clip 316 is directly and fixedly connected to the first planar spiral tube segment 3121 and the second planar spiral tube segment 3131 by welding, thereby maintaining the distance between the first planar spiral tube segment 3121 and the second planar spiral tube segment 3131.

[0057] Specifically, a spacer layer 317 is provided between the inner wall of the channel and the first heat exchange tube 312 or the second heat exchange tube 313, and the spacer layer 317 is used to fix the first heat exchange tube 312 and the second heat exchange tube 313.

[0058] By providing a spacer layer 317 between the first heat exchange tube 312 or the second heat exchange tube 313 and the inner wall of the channel, the first heat exchange tube 312 and the second heat exchange tube 313 can be fixed. Separating the first heat exchange tube 312 and the second heat exchange tube 313 from the insulation layer 315 of the shell 311 reduces the temperature of the inner surface of the insulation layer 315 and also provides some insulation. Using the spacer layer 317 reduces the cross-section of the channel in the shell 311, ensuring that the hot airflow is not wasted when passing through the first heat exchange tube 312 and the second heat exchange tube 313.

[0059] In this embodiment, the first heat exchange tube 312 or the second heat exchange tube 313 is connected to the insulation layer 315 by a spacer layer 317. The spacer layer 317 is manufactured by casting.

[0060] Specifically, it also includes a column 318, in which an empty channel is formed between the first planar spiral tube and the second planar spiral tube, and the column 318 is disposed in the empty channel.

[0061] In this application, because the heat exchange tubes of the first heat exchange tube 312 and the second heat exchange tube 313 are manufactured using a bending process, the bending angle at the middle position of the first planar spiral tube segment 3121 and the second planar spiral tube segment 3131 is large during the spiral arrangement process, thus leaving an empty channel in the middle. By setting a column 318, hot air is prevented from passing through the empty channel and can only pass through the airflow gap channel 314 between the first planar spiral tube segment 3121 and the second planar spiral tube segment 3131. This improves the heat utilization rate. At the same time, after setting the column 318, the cross-sectional area of ​​the airflow gap channel 314 becomes smaller, which leads to an increase in the airflow velocity in the channel, further improving the heat exchange efficiency.

[0062] Specifically, the center lines of the first planar spiral tube and the second planar spiral tube, which are interlocked, are approximately located in the same plane.

[0063] Furthermore, the cross-sectional area of ​​the first planar spiral tube segment 3121 is the same as that of the second planar spiral tube segment 3131. This design allows the first planar spiral tube segment 3121 and the second planar spiral tube segment 3131 to be arranged in the same vertical section. When multiple first planar spiral tube segments 3121 and multiple second planar spiral tube segments 3131 can be arranged side by side in the channel to the maximum extent, the heat exchange area is greatly increased, resulting in a better heat exchange effect.

[0064] Specifically, adjacent first planar spiral tube segments 3121 abut against each other, and adjacent second planar spiral tube segments abut against each other.

[0065] This allows for a more compact structure, accommodating more first-plane spiral tube segments 3121 and second-plane spiral tube segments 3131 within a pre-defined space. It also increases the heat exchange area and the length of the water channel, resulting in better heat exchange efficiency.

[0066] Specifically, it also includes a three-way pipe 6 and a water pump 7. The outlet of the water tank 4 is connected to both the water channel and the outlet of the gas-water separator 5 through the three-way pipe 6. The three-way pipe 6 has a first pipe 61 connecting the water tank 4, a second pipe 62 connecting the water channel, and a third pipe 63 connecting the outlet of the gas-water separator 5. The water pump 7 is installed on the second pipe 62.

[0067] Steam and saturated water are separated by a steam-water separator. The steam is output from the steam outlet of the steam-water separator 5 for use. The saturated water can be reintroduced into the water channel for continued use by the water pump 7. After the water pump 7 starts, it can simultaneously draw water from the water tank 4 and the saturated water from the steam-water separator for use. This effectively improves the utilization rate of heat.

[0068] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0069] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Meanwhile, the word "and / or" throughout the text means including three solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0070] All of the above components are general standard parts or components known to those skilled in the art. Their structure and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0071] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A steam generator utilizing solid thermal energy storage, characterized in that, include Solid thermal storage device (2), the solid thermal storage device (2) having a circulation channel (21); A heat exchange assembly (3) is disposed in a circulation channel (21), and the heat exchange assembly (3) has an airflow gap channel (314) and a water channel that communicate with the circulation channel (21); Water tank (4), the outlet of which is connected to the water passage; and A gas-water separator (5) has an inlet connected to the other end of the water channel and a steam outlet. In the circulation channel (21), the airflow flows upward, and the cross-sectional area of ​​the airflow gap channel (314) decreases sequentially. The heat exchange assembly (3) includes at least two heat exchange structures (31), the heat exchange structures (31) including The housing (311) has a channel; A first heat exchange tube (312) is disposed within the channel, and the first heat exchange tube (312) includes at least one first planar spiral tube segment (3121); and The second heat exchange tube (313) is disposed in the channel. The second heat exchange tube (313) includes at least one second planar spiral tube segment (3131). The second planar spiral tube segment (3131) is interlocked with the first planar spiral tube segment (3121). The airflow gap channel (314) is formed between the first planar spiral tube segment (3121) and the second planar spiral tube segment (3131). The first heat exchange tube (312) and the second heat exchange tube (313) serve as the water passage. The adjacent first planar spiral tube segment (3121) abuts against each other, and the adjacent second planar spiral tube segment (3131) abuts against each other.

2. The steam generator utilizing solid thermal energy storage according to claim 1, characterized in that, The inner and / or outer rings of the housing (311) are provided with a thermal insulation layer (315).

3. The steam generator utilizing solid thermal storage according to claim 1, characterized in that, The first planar spiral tube and the second planar spiral tube are fixedly connected by a positioning clamp (316).

4. The steam generator utilizing solid thermal energy storage according to claim 1, characterized in that, A spacer layer (317) is provided between the inner wall of the channel and the first heat exchange tube (312) or the second heat exchange tube (313), and the spacer layer (317) is used to fix the first heat exchange tube (312) and the second heat exchange tube (313).

5. The steam generator utilizing solid thermal energy storage according to claim 1, characterized in that, It also includes a column (318), in which an empty channel is formed between the first planar spiral tube and the second planar spiral tube, and the column (318) is disposed in the empty channel.

6. The steam generator utilizing solid thermal storage according to claim 1, characterized in that, The center lines of the first planar spiral tube and the second planar spiral tube, which are interlocked, are approximately located in the same plane.

7. The steam generator utilizing solid thermal energy storage according to claim 1, characterized in that, It also includes a three-way pipe (6) and a water pump (7). The outlet of the water tank (4) is connected to the water channel and the outlet of the gas-water separator (5) through the three-way pipe (6). The three-way pipe (6) has a first pipe (61) connecting the water tank (4), a second pipe (62) connecting the water channel, and a third pipe (63) connecting the outlet of the gas-water separator (5). The water pump (7) is installed on the second pipe (62).

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