Self-adjusting falling film steam generator for steam heat pump system

Abstract

The invention discloses a self-adjusting falling film steam generator for a steam heat pump system, and relates to the technical field of steam generators, the self-adjusting falling film steam generator comprises a liquid inlet chamber, a heat exchange chamber and a separation chamber which are sequentially arranged from top to bottom, a plurality of heat exchange pipes are arranged in the heat exchange chamber, and middle through pipes are arranged in the heat exchange pipes, so that liquid water overflows from pipe openings of the heat exchange pipes; the heat-sensitive adjusting assembly downwards flows along the inner wall of the heat exchange tube to obtain heat and gasify to generate steam, and a flow limiting plate is mounted on the heat-sensitive adjusting assembly; the thermosensitive adjusting assembly drives the flow limiting plate to move through the thermal expansion and cold contraction performance, and self-adjusting type flow control is achieved. The temperature-sensitive performance of the temperature-sensitive adjusting assembly is adopted to be matched with the temperature change, the position of the flow limiting plate is adjusted in a self-adaptive mode, and the liquid water flow is automatically controlled; the barb burrs are arranged on the outer wall of the built-in middle through pipe of the heat exchange pipe, the burrs pierce rising bubbles, air blockage is avoided, normal operation of water flowing downwards and rising steam is achieved, and then rapid heat exchange is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam generators, in particular to a self-regulating falling film steam generator for a steam heat pump system. Background Art

[0002] The principle of falling film evaporation was first applied in evaporation and concentration processes in the chemical industry (such as seawater desalination and food processing). Its characteristic is that the liquid flows along the heat exchange surface in the form of a thin film, significantly improving the heat transfer coefficient. In the late 20th century, this technology was incorporated into steam generator design, resulting in the falling film steam generator. By optimizing fluid distribution and phase change processes, it achieves more efficient thermal energy utilization.

[0003] Existing falling-film steam generators primarily produce concentrated liquid. For example, in steam heat pumps, the goal is high-temperature, high-pressure steam. During operation, the liquid in the falling-film steam generator flows down the tube wall for heat exchange. Because the temperature in the liquid inlet chamber fluctuates, when the temperature is high, the liquid flow rate needs to be increased to produce more steam. If the liquid flow rate is insufficient, the heat exchange area below the heat exchange tube cannot be effectively utilized. When the temperature is low, the liquid flow rate needs to be reduced. Otherwise, the liquid will not be fully heated and evaporated, weakening the boiling heat transfer effect. Conventional falling-film steam generators cannot automatically control the flow rate, resulting in poor heat exchange performance. Furthermore, bubbles are easily generated during the heat exchange process. The rising steam blocks the downward flow of the liquid, forming a gas lock, which prevents uniform heat exchange. Therefore, a self-regulating falling-film steam generator for steam heat pump systems is designed. Summary of the Invention

[0004] The object of the present invention is to provide a self-regulating falling film steam generator for a steam heat pump system to solve the above technical problems.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A self-regulating falling film steam generator for a steam heat pump system comprises a liquid inlet chamber, a heat exchange chamber, and a separation chamber, arranged in sequence from top to bottom. A plurality of heat exchange tubes are arranged inside the heat exchange chamber, one end of each heat exchange tube extending into the liquid inlet chamber, so that liquid overflows from the tube opening of the heat exchange tube and flows downward along the inner wall thereof. The heat exchange tube is provided with at least two thermally sensitive adjustment components in the vertical direction, and a flow limiting plate is installed on the thermally sensitive adjustment component; the thermally sensitive adjustment component drives the flow limiting plate to move through the thermal expansion and contraction performance, adjusts the gap between the flow limiting plate and the inner wall of the heat exchange tube, and realizes self-regulating flow control.

[0006] As a further solution of the present invention: the thermal adjustment component includes a sleeve installed on the inner wall of the heat exchange tube, the interior of the sleeve is slidably connected to a push rod, and the space between the push rod and the inner space of the sleeve is filled with mercury.

[0007] As a further solution of the present invention: the two flow limiting plates can form a truncated cone structure, and the structure is hollow.

[0008] As a further solution of the present invention: a semicircular ring is fixedly installed on the top of the current limiting plate, and the two semicircular rings are plug-connected by a plug-in block.

[0009] As a further solution of the present invention: a heat exchange tube built-in middle pipe is installed inside the heat exchange tube, and inverted burrs are evenly installed on the outer wall of the heat exchange tube built-in middle pipe.

[0010] As a further solution of the present invention: the port of the built-in middle pipe in the heat exchange tube is higher than the heat exchange tube.

[0011] As a further solution of the present invention: a coil is provided inside the liquid inlet chamber, and the coil is connected to a steam inlet pipe installed at an upper end of one side of the heat exchange chamber through a circulation pipe; A circulating medium discharge pipe is installed at the lower end of the other side of the heat exchange chamber. The circulating medium discharge pipe is connected to the compressor, and the compressor is connected to the coil to form a circulation loop.

[0012] As a further solution of the present invention: the coil is spiral-shaped and has a conical cross-section.

[0013] As a further solution of the present invention: a steam outlet pipe is installed on the top of the liquid inlet chamber, and the steam outlet pipe and the coil are in the same vertical direction.

[0014] As a further solution of the present invention: a liquid inlet pipe is installed on one side of the liquid inlet chamber, and a liquid discharge pipe is installed on one side of the separation chamber, and the liquid discharge pipe and the liquid inlet pipe form a circulation loop.

[0015] Beneficial effects of the present invention: The present invention uses the thermal sensitivity of the thermal adjustment component to adapt to temperature changes, realizes adaptive adjustment of the position of the flow limiting plate, and realizes automatic control of the liquid water flow; The present invention provides a heat exchange tube with a built-in central tube with barbed burrs on its outer wall. The barbs puncture rising bubbles, thus avoiding air blockage and ensuring normal operation of downward flowing water and rising steam, thereby achieving rapid heat exchange. The present invention uses a coil to first heat the steam discharged from the liquid inlet chamber to improve the quality of the steam; then it enters the heat exchange chamber again through the circulation pipe to achieve heat recycling. At the same time, the spiral coil allows the steam to remain in the liquid inlet chamber for a longer time, with higher heating efficiency; and it also plays a buffering role. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 Schematic diagram of the internal structure of the self-regulating falling film steam generator of the present invention; Figure 2 Schematic diagram of the internal structure of the heat exchange tube of the present invention; Figure 3 It is a schematic diagram of the overall structure of the thermal-sensitive adjustment component and the current limiting plate of the present invention; Figure 4 It is a structural diagram of another embodiment of the present invention.

[0018] In the figure: 1. Liquid inlet chamber; 11. Steam outlet pipe; 12. Liquid inlet pipe; 13. Coil; 14. Circulation pipe; 2. Heat exchange chamber; 21. Heat exchange pipe; 22. Steam inlet pipe; 23. Circulation medium discharge pipe; 24. Built-in central pipe in heat exchange pipe; 241. Burr; 25. Thermosensitive adjustment component; 251. Sleeve; 252. Push rod; 253. Current limiting plate; 254. Semicircular ring; 255. Plug-in block; 256. Connecting rod; 3. Separation chamber; 31. Liquid discharge pipe. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0020] Example 1

[0021] See also Figure 1 As shown, the present invention is a self-regulating falling film steam generator for a steam heat pump system, comprising an uppermost liquid inlet chamber 1, a liquid inlet pipe 12 being installed on one side of the liquid inlet chamber 1, through which a solution to be treated is transported into the liquid inlet chamber 1; The central heat exchange chamber 2 is equipped with multiple heat exchange tubes 21, which are installed in a circular array on the upper and lower tube sheets. The tubes 21 are arranged vertically, achieving downward flow and heat exchange under the action of gravity. The solution in the liquid inlet chamber 1 enters the heat exchange tubes 21 and then enters high-temperature steam through the steam inlet pipe 22, indirectly exchanging heat with the high-temperature steam. The solution is heated to its boiling point, and some of its water evaporates, generating secondary steam.

[0022] The lower separation chamber 3 processes the solution after heat exchange.

[0023] See Figure 1-Figure 3As shown, one end of the heat exchange tube 21 extends into the liquid inlet chamber 1, and the height of the heat exchange tube 21 exceeds the tube sheet portion, so that the liquid overflows from the tube mouth of the heat exchange tube 21 and flows downward along the inner wall thereof; The heat exchange tube 21 is vertically provided with at least two thermosensitive adjustment components 25, each of which is equipped with a flow limiting plate 253. Multiple thermosensitive adjustment components 25 and flow limiting plates 253 can be provided as needed. The thermosensitive adjustment components 25 drive the flow limiting plates 253 to move by their thermal expansion and contraction properties, adjusting the gap between the flow limiting plates 253 and the inner wall of the heat exchange tube 21 to achieve self-regulating flow control. Because the temperature within the liquid inlet chamber 1 fluctuates, when the temperature is high, more solution is required, and when the temperature is low, less solution is required. This results in better heat exchange and greater energy conservation. The thermal sensitivity of the thermosensitive adjustment components 25 is used to adapt to temperature changes, enabling adaptive adjustment of the position of the flow limiting plates 253 to control the solution flow.

[0024] See Figure 3 As shown, the thermosensitive adjustment component 25 includes a sleeve 251 installed on the inner wall of the heat exchange tube 21, and a push rod 252 is slidably connected to the interior of the sleeve 251. The internal space between the push rod 252 and the sleeve 251 is filled with mercury.

[0025] Mercury is filled inside the sleeve 251. Due to the principle of thermal expansion and contraction of mercury, when it expands, it drives the push rod 252 to move outward, thereby increasing the gap between the flow limiting plate 253 and the heat exchange tube 21, which will increase the flow rate; when the mercury contracts, it drives the push rod 252 to move inward, thereby reducing the gap between the flow limiting plate 253 and the heat exchange tube 21, which will reduce the flow rate, thereby achieving automatic flow control; other thermal sensitive elements similar to mercury can also be used.

[0026] Two or more flow restrictors 253 may form a truncated cone-shaped structure that is hollow. The truncated cone shape is used to match the inner diameter of the heat exchange tube 21 to better achieve blocking and drainage, while the hollow structure is used to better accommodate the passage of the built-in central tube 24 of the heat exchange tube.

[0027] A semicircular ring 254 is fixedly installed on the top of the flow limiting plate 253, and the two semicircular rings 254 are connected by plugging blocks 255; quarter-circular rings can also be used, which can be plugged into each other, so that not only can they be disassembled, but they can also support each other.

[0028] A heat exchange tube built-in middle tube 24 is installed inside the heat exchange tube 21, and inverted burrs 241 are evenly installed on the outer wall of the heat exchange tube built-in middle tube 24. During the heat exchange of the liquid, bubbles will be generated. The generated bubbles will block the transfer of heat and form air plugs, resulting in low heat exchange efficiency. Therefore, barbed burrs 241 are provided on the outer wall of the heat exchange tube built-in middle tube 24. The burrs 241 will puncture the rising bubbles, accelerate the heating of the liquid, and thus achieve rapid heat exchange.

[0029] The port of the built-in middle tube 24 of the heat exchange tube is higher than the heat exchange tube 21 to prevent the solution from entering the interior thereof.

[0030] The liquid inlet chamber 1 is provided with a coil 13 inside, and the coil 13 is connected to the steam inlet pipe 22 installed at the upper end of one side of the heat exchange chamber 2 through a circulation pipe 14; A circulating medium discharge pipe 23 is installed at the lower end of the other side of the heat exchange chamber 2. The circulating medium discharge pipe 23 is connected to the compressor, and the compressor is connected to the coil 13 to form a circulation loop.

[0031] After the circulating medium is compressed by the compressor, high-pressure steam is generated. The high-pressure steam first heats the steam discharged from the liquid inlet chamber 1 through the coil 13, thereby improving the quality of the steam and reducing the temperature difference between the heating section and the steam. The steam then enters the heat exchange chamber 2 again through the circulation pipe 14, realizing heat recycling. At the same time, the arrangement of the spiral coil 321 allows the steam to remain in the liquid inlet chamber 1 for a longer time, thereby improving the heating efficiency. The coil 13 is spiral-shaped and has a conical cross-section. The coil 13 is used for its cushioning properties. Directly passing compressed steam through a straight pipe into the liquid inlet chamber 1 would generate vibration. The conical structure is designed because the incoming steam is at its highest temperature, heating quickly. Subsequent heat loss occurs, allowing it to remain in the pipe longer, resulting in better heating.

[0032] A steam outlet pipe 11 is installed on the top of the liquid inlet chamber 1. The steam outlet pipe 11 and the coil 13 are in the same vertical direction in order to heat the discharged steam.

[0033] A liquid discharge pipe 31 is installed on one side of the separation chamber 3 , and the liquid discharge pipe 31 forms a circulation loop with the liquid inlet pipe 12 for refilling the remaining liquid into the liquid inlet chamber 1 for use.

[0034] Example 2

[0035] See Figure 4As shown, the thermosensitive adjustment component 25 is installed in the liquid inlet chamber 1. The bottom of the thermosensitive adjustment component 25 is movably connected to a connecting rod 256. The end of the connecting rod 256 is fixedly installed with a flow limiting plate 253. The flow limiting plate 253 is rotatably installed in the heat exchange tube 21. Automatic flow control can also be achieved through this structure, except that the thermal adjustment component 25 is arranged outside the heat exchange tube 21.

[0036] Working principle: The solution to be treated is transported into the liquid inlet chamber 1 through the liquid inlet pipe 12, and the liquid overflows from the tube mouth of the heat exchange tube 21 and flows downward along its inner wall; mercury is filled inside the sleeve 251. Due to the thermal expansion and contraction principle of mercury, when it expands, it will drive the push rod 252 to move outward, so that the gap between the flow limiting plate 253 and the heat exchange tube 21 increases, which will increase the flow rate; when the mercury contracts, it will drive the push rod 252 to move inward, so that the gap between the flow limiting plate 253 and the heat exchange tube 21 decreases, which will reduce the flow rate; thereby realizing automatic flow control.

[0037] Then, high-pressure steam is introduced to perform heat exchange. During the heat exchange process, the outer wall of the built-in middle tube 24 of the heat exchange tube is provided with barbed burrs 241. The burrs 241 puncture the rising bubbles, accelerate the heating of the liquid, and thus achieve rapid heat exchange. Finally, after the circulating working medium is compressed by the compressor, high-pressure steam is generated. The high-pressure steam first heats the steam discharged from the liquid inlet chamber 1 through the coil 13, thereby improving the quality of the steam and reducing the temperature difference between the heating section and the steam; then it enters the heat exchange chamber 2 again through the circulation pipe 14 to realize the recycling of heat. At the same time, through the setting of the spiral coil 321, the steam can stay in the liquid inlet chamber 1 for a longer time and the heating efficiency is higher.

[0038] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A self-regulating falling film steam generator for a steam heat pump system, comprising a liquid inlet chamber (1), a heat exchange chamber (2), and a separation chamber (3) arranged in sequence from top to bottom, wherein a plurality of heat exchange tubes (21) are arranged inside the heat exchange chamber (2), and characterized in that: One end of the heat exchange tube (21) extends into the liquid inlet chamber (1), so that the liquid overflows from the tube opening of the heat exchange tube (21) and flows downward along the inner wall thereof; The heat exchange tube (21) is provided with at least two thermally sensitive adjustment components (25) in the vertical direction, and a flow limiting plate (253) is installed on the thermally sensitive adjustment component (25); the thermally sensitive adjustment component (25) drives the flow limiting plate (253) to move through its thermal expansion and contraction performance, thereby adjusting the gap between the flow limiting plate (253) and the inner wall of the heat exchange tube (21), thereby achieving self-regulating flow control.

2. The self-regulating falling film steam generator for a steam heat pump system according to claim 1, characterized in that: The thermosensitive adjustment component (25) comprises a sleeve (251) mounted on the inner wall of the heat exchange tube (21); a push rod (252) is slidably connected to the interior of the sleeve (251); and the internal space between the push rod (252) and the sleeve (251) is filled with mercury.

3. The self-regulating falling film steam generator for a steam heat pump system according to claim 1, characterized in that: The two flow limiting plates (253) can form a truncated cone-shaped structure, and are a hollow structure.

4. The self-regulating falling film steam generator for a steam heat pump system according to claim 1, characterized in that: A semicircular ring (254) is fixedly mounted on the top of the flow limiting plate (253), and the two semicircular rings (254) are plug-connected via a plug-in block (255).

5. The self-regulating falling film steam generator for a steam heat pump system according to claim 1, characterized in that: A heat exchange tube built-in middle through tube (24) is installed inside the heat exchange tube (21), and inverted burrs (241) are evenly installed on the outer wall of the heat exchange tube built-in middle through tube (24).

6. The self-regulating falling film steam generator for a steam heat pump system according to claim 5, characterized in that: The port of the built-in middle tube (24) of the heat exchange tube is higher than the heat exchange tube (21).

7. The self-regulating falling film steam generator for a steam heat pump system according to claim 1, characterized in that: A coil (13) is provided inside the liquid inlet chamber (1), and the coil (13) is connected to a steam inlet pipe (22) installed at the upper end of one side of the heat exchange chamber (2) through a circulation pipe (14); A circulating medium discharge pipe (23) is installed at the lower end of the other side of the heat exchange chamber (2). The circulating medium discharge pipe (23) is connected to the compressor, and the compressor is connected to the coil (13), forming a circulation loop.

8. The self-regulating falling film steam generator for a steam heat pump system according to claim 7, characterized in that: The coil (13) is spiral-shaped, and its cross section is a conical structure.

9. The self-regulating falling film steam generator for a steam heat pump system according to claim 7, characterized in that: A steam outlet pipe (11) is installed on the top of the liquid inlet chamber (1), and the steam outlet pipe (11) and the coil (13) are in the same vertical direction.

10. The self-regulating falling film steam generator for a steam heat pump system according to claim 1, characterized in that: A liquid inlet pipe (12) is installed on one side of the liquid inlet chamber (1), and a liquid discharge pipe (31) is installed on one side of the separation chamber (3). The liquid discharge pipe (31) and the liquid inlet pipe (12) form a circulation loop.

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