Evaporation and condensation heat exchange system and power generation system

Abstract

The embodiment of the utility model provides an evaporation and condensation heat exchange system and a power generation system. The evaporation and condensation heat exchange system comprises a water storage tank, a spraying piece, a heat exchange pipe and a heat source chamber shell. The spraying part is communicated with the water storage tank, the heat exchange pipe is arranged above the water storage tank, the heat exchange pipe comprises a first section and a second section which are communicated with each other, and a nozzle of the spraying part is arranged towards the second section so that gas in the second section can be cooled through spraying water; the heat source chamber shell is arranged outside the first section in a covering mode, and the heat source chamber shell and the first section form a heat exchange channel allowing gas to enter so that the introduced gas can be condensed. According to the utility model, the dead steam introduced between the heat exchange tube and the heat source chamber shell is used for cooling, so that the dead steam in the steam turbine is cooled to achieve the effect of recycling, and the heat exchange in the heat exchange tube is realized by virtue of the matching of the water storage tank, the spraying piece and the second section. Therefore, the evaporation and condensation heat exchange system has the advantages that the equipment size is reduced, and water is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, in particular to an evaporation-condensation heat exchange system and a power generation system with the evaporation-condensation heat exchange system. Background Art

[0002] my country's power industry, primarily coal-fired, will continue to dominate for a considerable period of time. For example, finding efficient heat exchange equipment for exhaust steam condensing units at the cold end of power plants is an effective way to mitigate the impact of water and energy crises on water- and energy-intensive industries like the power industry. Water-cooled condensers can recover waste heat from wastewater and exhaust gases, but typically require a cooling tower for condensation and cooling, which occupies a large area and consumes a lot of water. Utility Model Content

[0003] The present invention aims to at least partially address one of the technical problems in the related art. To this end, embodiments of the present invention provide an evaporative condensing heat exchange system. This evaporative condensing heat exchange system has the advantages of reducing equipment size and conserving water.

[0004] An embodiment of the present invention further provides a power generation system.

[0005] The evaporation-condensation heat exchange system of the embodiment of the utility model includes a water storage tank, a spraying element, a heat exchange pipe and a heat source chamber shell.

[0006] The spray component is connected to the water tank; the heat exchange pipe is arranged above the water tank, and the heat exchange pipe includes a first section and a second section that are connected. The nozzle of the spray component is arranged toward the second section so as to cool the gas in the second section by spraying water; the heat source chamber shell cover is arranged outside the first section, and the heat source chamber shell and the first section form a heat exchange channel for exhaust steam to pass through so as to cool the exhaust steam introduced.

[0007] The evaporative condensation heat exchange system of the present invention forms a heat exchange channel for exhaust steam between the heat source chamber housing and the first section to cool the incoming exhaust steam, thereby recovering the heat from the hot gas. Water from the water storage tank is sprayed outside the second section via a spray element, exchanging heat transferred from the exhaust steam to the first section. The exhaust steam is then condensed into water for recycling. The sprayed water is then used to cool the gas in the second section. This cooling, combined with the heat exchange pipes, eliminates the need for a cooling tower and reduces equipment construction costs. This helps address the issues of large equipment size and high water consumption.

[0008] Therefore, the evaporation-condensation heat exchange system of the embodiment of the present invention has the advantages of reducing equipment size, construction cost and saving water.

[0009] In some embodiments, the heat exchange tubes are provided in multiple groups, and the multiple groups of heat exchange tubes are arranged in the heat source chamber shell at intervals along the upper and lower sides. The heat exchange tubes are closed coils, and the heat exchange tubes are filled with phase change materials so that the air pressure in the coil is changed during heat exchange to drive the movement of the phase change materials.

[0010] In some embodiments, the evaporative condensation heat exchange system further includes a vacuum pump, which is connected to the heat exchange channel.

[0011] In some embodiments, the evaporative condensation heat exchange system further includes a cold source chamber shell, and the second section is disposed in the cold source chamber shell.

[0012] In some embodiments, the evaporative condensation heat exchange system further includes a first partition and a second partition, the first partition and the second partition are spaced apart, a layer of thermal insulation material is filled between the first partition and the second partition, the first partition is connected to the heat source chamber shell, and the second partition is connected to the cold source chamber shell.

[0013] In some embodiments, the spray part includes a spray pipe and multiple nozzles, one end of the spray pipe is connected to the water tank, and the other end of the spray pipe extends to above the second section, and the multiple nozzles are arranged at intervals along the extension direction of the second section.

[0014] In some embodiments, the heat exchange tube is tilted, and the angle between the heat exchange tube and the horizontal direction is 5° to 90°.

[0015] In some embodiments, the evaporative condensation heat exchange system further includes a liquid distribution pipe, which is disposed in the up and down directions between the second section and the nozzle to disperse the spray water.

[0016] In some embodiments, the evaporative condensation heat exchange system further includes a material-splitting filler layer, which is disposed in the water storage tank and is located below the second section.

[0017] In some embodiments, the evaporative condensation heat exchange system further includes a box cover and an induced draft fan, wherein the box cover is disposed on the water storage tank, and the induced draft fan is disposed on the box cover.

[0018] In some embodiments, the evaporative condensation heat exchange system further includes a water baffle, which is disposed on a side of the second section away from the first section.

[0019] In some embodiments, the evaporative condensation heat exchange system further includes a water supply tank, which is connected to the water storage tank.

[0020] The power generation system of the embodiment of the present invention includes a steam turbine and an evaporation-condensation heat exchange system according to any one of the above-mentioned methods, wherein the exhaust steam of the steam turbine is introduced into the heat exchange channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a layout diagram of the evaporation-condensation heat exchange system of an embodiment of the present utility model.

[0022] Figure 2 yes Figure 1 A cross-sectional view along line aa in one embodiment.

[0023] Figure 3 yes Figure 1 A cross-sectional view along line aa in another embodiment.

[0024] Figure 4 yes Figure 1 Cross-sectional view along line bb.

[0025] Figure 5 yes Figure 1 Cross-sectional view along line cc.

[0026] Reference numerals:

[0027] Water storage tank 1; liquid filling port 11; air inlet 12;

[0028] Spray pipe 21; spray head 22;

[0029] Heat exchange tube 3; first section 31; second section 32;

[0030] Heat source chamber shell 4; exhaust steam inlet 41; condensate outlet 42;

[0031] Vacuum pump 5;

[0032] Liquid distribution pipe 6;

[0033] Scrape material filling layer 7;

[0034] Box cover 81; induced draft fan 82;

[0035] Water retaining plate 9. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] Reference below Figure 1-Figure 5 The evaporation-condensation heat exchange system and the power generation system according to the embodiments of the present invention are described.

[0038] The evaporation-condensation heat exchange system of the embodiment of the present utility model includes a water storage tank 1 , a spraying element, a heat exchange tube 3 and a heat source chamber shell 4 .

[0039] The spray element is connected to the water tank 1. The heat exchange tube 3 is located above the water tank 1 and includes a first section 31 and a second section 32. The spray element's nozzle 22 is positioned toward the second section 32 to cool the gas within the second section 32 by spraying water. The heat source chamber housing 4 is located outside the first section 31. The heat source chamber housing 4 and the first section 31 form a heat exchange channel for exhaust steam to pass through, thereby cooling the incoming exhaust steam. It is understood that the spray element's nozzle 22 is also located above the water tank 1, and the water level in the water tank 1 circulates water.

[0040] The evaporative condensation heat exchange system of this embodiment of the utility model recovers heat from the hot gas by forming a heat exchange channel for exhaust steam with the heat source chamber housing 4 and the first section 31 to cool the incoming exhaust steam. Water from the water storage tank is sprayed outside the second section via a spray element, exchanging heat transferred from the exhaust steam to the first section. The exhaust steam is then condensed into water for recycling. The sprayed water simultaneously cools the gas within the second section, and in conjunction with the heat exchange pipes, the exhaust steam is cooled, eliminating the need for a cooling tower and reducing equipment construction costs. This, in turn, helps address the issues of large equipment size and high water consumption.

[0041] In addition, in the evaporative condensation heat exchange system of the embodiment of the present invention, the spray component is arranged above the water tank 1, and the circulating water is at the bottom of the water tank 1. The spray component circulates the water in the water tank 1 to cool the second section 32. After heat exchange, it exchanges heat with the wind entering the water tank 1, and finally flows to the bottom of the water tank 1 for recycling.

[0042] Therefore, the evaporation-condensation heat exchange system of the embodiment of the present invention has the advantages of reducing equipment size, construction cost and saving water.

[0043] Furthermore, the side of the water storage tank 1 is provided with a liquid replenishing port 11 and an air inlet 12. Thus, the liquid lost during the cooling process can be replenished through the provided liquid replenishing port 11.

[0044] The heat source chamber shell 4 has an exhaust steam inlet 41 and a condensate outlet 42 arranged opposite to each other.

[0045] like Figure 1 and Figure 5 As shown, there are multiple groups of heat exchange tubes 3, which are arranged in the heat source chamber shell 4 at intervals along the upper and lower sides. The heat exchange tubes 3 are closed coils and are filled with phase change materials so that the air pressure in the coil is changed during heat exchange to drive the movement of the phase change materials.

[0046] The evaporation-condensation heat exchange system of the present invention is provided with multiple groups of heat exchange tubes 3, which helps to increase the heat exchange area of the system, thereby helping to improve the heat exchange efficiency of the system. During operation, the phase change material inside the system will phase change and heat during the phase change process.

[0047] For example, heat is transferred from the first section 31 to the second section 32. In the first section 31, the liquid working medium absorbs heat and vaporizes, and then continuously absorbs heat to form a new vapor plug. The vapor plug evaporates due to the heat, and the pressure continues to increase, pushing the adjacent liquid plug to flow to the second section 32. The vapor column shrinks in the second section 32, thereby forming a large pressure difference between the hot and cold sections. Due to the staggered distribution of the vapor and liquid plugs, a strong reciprocating oscillation motion is generated in the heat exchange tube 3, thereby achieving efficient heat transfer. Therefore, the evaporation and condensation heat exchange system has the advantage of high heat exchange efficiency. In addition, the phase change material fluid in the heat exchange tube 3 transfers heat in the form of latent heat of vaporization. Its feature of not being affected by gravity enables it to be used in environments such as inversion, change or microgravity of the gravity field. The heat exchange tube 3 is suitable for different heating methods and heating positions. Therefore, the heat exchange tube 3 technology is applied to the flue gas recovery system. As a result, the equipment size can be reduced, the production process can be simplified, and costs can be saved.

[0048] Furthermore, each heat exchange tube 3 is in an S-shaped coil shape.

[0049] like Figure 1 As shown, the evaporation-condensation heat exchange system of the embodiment of the present invention further includes a vacuum pump 5 , which is connected to the heat exchange channel.

[0050] The evaporative condensation heat exchange system of the present embodiment, by providing a vacuum pump 5 in communication with the heat exchange channel, can maintain the heat exchange channel at a suitable pressure range, promote the condensation of the exhaust gas, and allow the condensed liquid to flow down by gravity, thereby further improving efficient heat transfer.

[0051] The evaporative condensation heat exchange system of the embodiment of the present invention further includes a cold source chamber shell (not shown), and the second section 32 is disposed in the cold source chamber shell, which contributes to the overall structural strength of the device.

[0052] The evaporative condensation heat exchange system of an embodiment of the present invention also includes a first partition and a second partition, the first partition and the second partition are arranged at intervals, and a layer of insulating material is filled between the first partition and the second partition, the first partition is connected to the heat source chamber shell, and the second partition is connected to the cold source chamber shell.

[0053] The evaporation-condensation heat exchange system of the embodiment of the present invention provides a heat-insulating material layer between the first partition plate and the second partition plate, thereby enabling efficient heat transfer and achieving efficient exhaust steam heat exchange.

[0054] like Figure 1As shown, the spray part includes a spray pipe 21 and a plurality of nozzles 22. One end of the spray pipe 21 is connected to the water tank 1, and the other end of the spray pipe 21 extends to the top of the first section 31. The plurality of nozzles 22 are arranged at intervals along the extension direction of the second section 32.

[0055] The evaporation-condensation heat exchange system of the embodiment of the present invention helps to improve the uniformity of cooling the second section 32 by disposing multiple nozzles 22 above the second section 32, thereby helping to improve the cooling efficiency of the phase change material in the second section 32.

[0056] Optionally, a circulating water pump is provided on the spray pipe 21 of the spray member so that the water in the water storage tank 1 can be circulated through the circulating water pump.

[0057] like Figure 1 and Figure 5 As shown, the evaporative condensing heat exchange system of this embodiment of the present invention further includes a liquid distribution pipe 6 , which is disposed vertically between the second section 32 and the nozzle 22 to distribute the spray water. In other words, the nozzle 22 , the liquid distribution pipe 6 , and the second section 32 are disposed sequentially from high to low.

[0058] In the evaporative condensation heat exchange system of the embodiment of the present invention, the circulating water sprayed by the spray part can be evenly formed into a film on the surface of the heat exchange tube 3 through the provided liquid distribution pipe 6 for heat exchange, which helps to form a hanging cooling water film on the second section 32. After the water film is formed, it helps to further improve the efficiency of heat transfer.

[0059] like Figure 1 As shown, the evaporation-condensation heat exchange system of the embodiment of the present utility model further includes a material-splitting filler layer 7 , which is disposed in the water storage tank 1 and is located below the second section 32 .

[0060] The evaporative condensation heat exchange system of the embodiment of the utility model is provided with a filler layer 7 arranged below the second section 32, and a filler is provided at the bottom of the box body. After the spray water falls on the filler layer 7, it can fully exchange heat with the air, thereby increasing its contact time and further reducing the temperature of the cooling water in the water storage tank.

[0061] like Figure 2 and Figure 3 As shown, the heat exchange tube 3 is arranged tilted, and the angle between the heat exchange tube 3 and the horizontal direction is 5° to 90°.

[0062] The evaporative condensation heat exchange system of the present embodiment of the utility model has an inclined heat exchange tube 3, which not only facilitates the smooth outflow of the sprayed condensate, but also the water sprayed from the nozzle forms a water film in the second section, which moves along the width of the second section before falling, thereby increasing the contact time between the condensate and the second section and improving the condensation efficiency.

[0063] The second section 32 is plate-shaped. Because the diameter of the second section 32 is generally thin, its structural strength is relatively low during the continuous phase change of the phase change material. This improves the overall structural strength of this portion of the structure. Therefore, the evaporative condensation heat exchange system of this embodiment of the utility model has the advantage of high structural strength.

[0064] For example, the heat exchange tube 3 may be a stainless steel tube or a copper tube.

[0065] like Figure 1 As shown, the evaporation-condensation heat exchange system of the embodiment of the present invention further includes a box cover 81 and an induced draft fan 82 . The box cover 81 is arranged on the water storage tank 1 , and the induced draft fan 82 is arranged on the box cover 81 .

[0066] The evaporative condensation heat exchange system of the present embodiment has good structural integrity due to the provision of the tank cover 81 and the induced draft fan 82. The provided fan can promptly discharge water vapor from the water storage tank 1, thereby promoting the formation of a water film on the outer side of the second section 32, thereby improving the efficiency of heat exchange.

[0067] like Figure 1 As shown, the evaporative condensing heat exchange system of the embodiment of the present invention further includes a water retaining plate 9 , which is arranged on a side of the second section 32 away from the first section 31 .

[0068] The evaporative condensation heat exchange system of the embodiment of the utility model reduces the loss of spray water caused by the fan due to the dissipation and blowing of the spray water by the provided water baffle 9. Therefore, the evaporative condensation heat exchange system has the advantage of saving water.

[0069] The evaporation-condensation heat exchange system of the embodiment of the present invention further includes a water supply tank, which is connected to the water storage tank 1 .

[0070] The evaporation-condensation heat exchange system of the embodiment of the present invention can replenish the water in the water storage tank 1 in a timely manner through the provided water replenishment tank.

[0071] Furthermore, the water replenishing tank has a liquid outlet, which is connected to the external circulating water.

[0072] The power generation system of the embodiment of the present invention includes a steam turbine and an evaporation-condensation heat exchange system according to any one of the above items, and the exhaust steam of the steam turbine is introduced into the heat exchange channel.

[0073] Therefore, the power generation system of the embodiment of the present invention has the advantages of reducing equipment size and saving water.

[0074] The water storage tank 1 is connected to the steam turbine. The heat of the exhaust steam absorbed in the storage tank is returned to the steam turbine after being processed.

[0075] In the medium-parameter waste incineration waste heat power generation system, exhaust steam at approximately 40°C is discharged into the heat source chamber housing 4 and exchanged with the circulating cooling water in the water storage tank 1. The cooled exhaust steam is condensed and re-transferred to the power generation system. The heated cooling water exchanges heat with the air before returning to the bottom of the water storage tank 1 for recycling. This evaporation-condensation heat exchange system can replace condensers and cooling towers. The exhaust steam enters the spraying device through a circulating water pump, then flows through the liquid distribution pipe 6 and evenly falls onto the surface of the heat exchange tube 3 for heat exchange. After heat exchange, it exchanges heat with the air entering the water storage tank 1 before returning to the bottom of the water storage tank 1 for recycling.

[0076] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0077] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0078] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0079] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0080] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0081] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An evaporation-condensation heat exchange system, characterized in that: include: A water storage tank and a spraying element, wherein the spraying element is connected to the water storage tank; a heat exchange pipe, the heat exchange pipe being arranged above the water storage tank, the heat exchange pipe comprising a first section and a second section being connected, the nozzle of the spraying member being arranged toward the second section so as to cool the gas in the second section by spraying water from the spraying member; The heat source chamber shell is arranged outside the first section, and the heat source chamber shell and the first section form a heat exchange channel for exhaust steam to pass through so as to cool the exhaust steam.

2. The evaporation condensation heat exchange system according to claim 1, characterized in that: The heat exchange tubes are provided in multiple groups, and the multiple groups of heat exchange tubes are spaced apart in the upper and lower directions. The heat exchange tubes are in the form of closed coils, and are filled with phase change materials so that the air pressure in the coils is changed during heat exchange to drive the movement of the phase change materials.

3. The evaporation-condensation heat exchange system according to claim 2, characterized in that: A vacuum pump is also included, and the vacuum pump is communicated with the heat exchange channel.

4. The evaporation-condensation heat exchange system according to claim 1, characterized in that: It also includes a cold source chamber shell, and the second section is arranged in the cold source chamber shell.

5. The evaporation condensation heat exchange system according to claim 4, characterized in that: It also includes a first partition and a second partition, the first partition and the second partition are arranged at intervals, a layer of thermal insulation material is filled between the first partition and the second partition, the first partition is connected to the heat source chamber shell, and the second partition is connected to the cold source chamber shell.

6. The evaporation-condensation heat exchange system according to claim 1, characterized in that: The spraying member includes a spray pipe and a plurality of spray heads, one end of the spray pipe is connected to the water storage tank, the other end of the spray pipe extends above the second section, and the plurality of spray heads are spaced apart along the extension direction of the second section; And / or, the heat exchange tube is arranged at an angle, and the angle between the heat exchange tube and the horizontal direction is 5° to 90°.

7. The evaporative condensation heat exchange system according to claim 6, characterized in that: It also includes a liquid distribution pipe, which is arranged between the second section and the spray head in the up and down directions to disperse the spray water.

8. The evaporation-condensation heat exchange system according to claim 6, characterized in that: It also includes a material-scraping filling layer, which is arranged in the water storage tank and is located below the second section.

9. The evaporative condensation heat exchange system according to claim 1, characterized in that: It also includes a box cover and an induced draft fan, wherein the box cover is arranged on the water storage tank, and the induced draft fan is arranged on the box cover; And / or, further comprising a water baffle, wherein the water baffle is arranged on a side of the second section away from the first section; And / or, it also includes a water supply tank, which is connected to the water storage tank.

10. A power generation system, characterized in that: It comprises a steam turbine and an evaporation-condensation heat exchange system according to any one of claims 1 to 9, wherein the exhaust steam of the steam turbine is introduced into the heat exchange channel.

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