Intercooling tower anti-freezing system and thermal generator set

Abstract

The invention discloses an intercooling tower anti-freezing system and a thermal generator set, the intercooling tower anti-freezing system comprises a main pipeline and a plurality of branch pipelines, the main pipeline extends along the circumferential direction of an intercooling tower, the main pipeline is provided with a communication port for introducing a heating medium, the branch pipelines are connected with the main pipeline, the plurality of branch pipelines are arranged along the circumferential direction of the intercooling tower at intervals, and the communication port is communicated with the main pipeline. The branch pipelines are provided with nozzles arranged towards the finned tubes. The embodiment of the invention provides an anti-freezing system of an indirect cooling tower, which can effectively prevent the finned tube from icing, frost cracking and the like in winter, so that a thermal generator set keeps low-backpressure operation, the operation and maintenance cost is reduced, and the power generation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of an intercooler antifreeze system for a thermal power plant, and in particular to an intercooler antifreeze system for a thermal power plant and a thermal power generating set. Background Art

[0002] The intercooler uses ambient air to cool the circulating water in the pipes, which has a significant water-saving effect. It has been widely used in thermal power plants in the coal-rich and water-scarce areas in northern my country. The winter climate in the area where the intercooler is located is cold, which can easily cause the finned tubes at the bottom of the intercooler to freeze or even crack, threatening the safety of the unit and increasing the maintenance cost of the equipment. After the finned tubes are frozen and cracked, they are often treated by blocking the tubes, which leads to a decrease in the thermal performance of the intercooler, poor unit economy, and low power generation efficiency. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes an intercooler antifreeze system, which can effectively prevent fin tubes from freezing and cracking in winter, so that the thermal power generator set can maintain low back pressure operation, reduce operation and maintenance costs, and improve power generation efficiency.

[0005] The intercooling tower antifreeze system of an embodiment of the present invention includes a main pipe and multiple branch pipes, wherein the main pipe extends along the circumference of the intercooling tower, the main pipe is provided with a connecting port for introducing a heating medium, the branch pipes are connected to the main pipe, and the multiple branch pipes are arranged at intervals along the circumference of the intercooling tower, and the branch pipes have nozzles arranged toward the fin tubes.

[0006] In some embodiments, the branch pipe is extended up and down, the lower end of the branch pipe is connected to the main pipe, and the upper end of the branch pipe is higher than the fin tube.

[0007] In some embodiments, a plurality of the nozzles are disposed on the branch pipe, and the plurality of the nozzles are spaced apart along the length direction of the branch pipe.

[0008] In some embodiments, a nozzle is provided on the branch pipe, the end of the nozzle forms the nozzle, and the axis of the nozzle is perpendicular to the radial direction of the tower.

[0009] In some embodiments, the intercooling tower antifreeze system further comprises a support, and the branch pipeline is connected to the intercooling tower through the support; and / or

[0010] Two adjacent branch pipes are connected via the support member.

[0011] In some embodiments, at least one of the main pipe and the branch pipe is provided with a valve.

[0012] In some embodiments, the fin tube has a water outlet, and the water outlet is provided with a temperature monitoring device.

[0013] In some embodiments, the intercooler antifreeze system further includes a host, and the temperature monitoring device and the valve are both electrically connected to the host.

[0014] The thermal power generating set in the embodiment of the present invention comprises a boiler, an intercooling tower and an intercooling tower antifreeze system, wherein the intercooling tower antifreeze system is the intercooling tower antifreeze system described in any of the above embodiments.

[0015] In some embodiments, the thermal power generating set further comprises a smoke exhaust pipe connected to the boiler, and the smoke exhaust pipe is connected to the main pipe through the connecting port.

[0016] The intercooler antifreeze system of the embodiment of the present invention can introduce a heating medium into the main pipe through the connecting port when the temperature is low in winter. The heating medium enters multiple branch pipes along the main pipe and is then sprayed onto the fin tubes through nozzles on the branch pipes. The heat of the heating medium is transferred from the outside to the inside of the fin tubes to achieve heat exchange, so that the temperature of the fin tubes is maintained at the antifreeze temperature, thereby preventing the fin tubes from freezing, cracking, etc., so that the thermal power generator set maintains low back pressure operation, reduces operation and maintenance costs, and improves power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of an intercooling tower antifreeze system and an intercooling tower according to an embodiment of the present invention.

[0018] Figure 2 It is a schematic projection diagram of an intercooler antifreeze system according to an embodiment of the present invention on a horizontal plane.

[0019] Figure 3 It is a partial view of an intercooler antifreeze system according to an embodiment of the present invention.

[0020] Figure 4 It is a schematic structural diagram of the branch pipes of the intercooler antifreeze system according to one embodiment of the present invention.

[0021] Figure 5 The present invention is a control flow chart of a valve of an intercooler antifreeze system according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 10. Intercooler antifreeze system;

[0024] 1. Main pipeline; 11. Connecting pipe; 111. Connecting port;

[0025] 2. branch pipe; 21. nozzle; 211. nozzle;

[0026] 3. Support member; 31. First support rod; 32. Second support rod;

[0027] 41. Host; 42. Collection box; 43. Temperature sensor; 44. Valve actuator; 45. Valve;

[0028] 20. Intercooler; 201. Tower; 202. Finned tube; 203. Air inlet. DETAILED DESCRIPTION

[0029] 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.

[0030] like Figures 1 to 3 As shown, the intercooling tower 20 includes a tower 201 and a plurality of fin tubes 202 arranged at the lower side of the tower 201. The outer contour of the fin tube 202 is in the shape of a long rectangular body and extends vertically. The edges of two adjacent fin tubes 202 are connected and arranged at an angle. The plurality of fin tubes 202 are connected end to end along the circumference of the tower 201, that is, the plurality of fin tubes 202 form a cooling triangular fin tube bundle, thereby forming a plurality of triangular air inlets 203 evenly distributed along the circumference of the tower 201. The air inlets 203 are for ambient air to enter so as to achieve heat exchange with the fin tubes 202. The plurality of fin tubes 202 are internally connected, and the circulating water flows inside the fin tubes 202. The heat of the circulating water is transferred to the surface of the fin tubes 202. The ambient air enters the gap between the adjacent fin tubes 202 through the air inlet 203 to take away the heat of the circulating water, thereby achieving cooling of the circulating water.

[0031] like Figures 1 to 3 As shown, the intercooler antifreeze system 10 of the embodiment of the present invention includes a main pipeline 1 and multiple branch pipelines 2. The main pipeline 1 extends along the circumference of the intercooler 20, and is provided with a connecting port 111 for introducing a heating medium; the branch pipeline 2 is connected to the main pipeline 1, and the multiple branch pipelines 2 are arranged at intervals along the circumference of the intercooler 20, and the branch pipeline 2 has a nozzle 211 arranged toward the fin tube 202.

[0032] The intercooler antifreeze system 10 of the embodiment of the present invention can introduce a heating medium into the main pipe 1 through the connecting port 111 when the temperature is low in winter. The heating medium enters the multiple branch pipes 2 along the main pipe 1 and is then sprayed toward the fin tubes 202 through the nozzles 211 on the branch pipes 2. The heat of the heating medium is transferred from the outside to the inside of the fin tubes 202 to achieve heat exchange, so that the temperature of the fin tubes 202 is maintained at the antifreeze temperature, thereby preventing the fin tubes 202 from freezing, freezing and cracking, etc., so that the thermal power generator set maintains low back pressure operation, reduces operation and maintenance costs, and improves power generation efficiency.

[0033] As an example, Figure 1 and Figure 2 As shown, the main pipe 1 is annular and surrounds the tower 201; a connecting pipe 11 is connected to one side of the main pipe 1, and the end of the connecting pipe 11 forms the above-mentioned connecting port 111 for the heating medium to pass through. Multiple branch pipes 2 are evenly arranged along the circumference of the tower 201, and can heat the multiple fin tubes 202 arranged along the circumference of the tower 201, so that the fin tubes 202 are evenly heated, thereby preventing the fin tubes 202 from being partially frozen or cracked.

[0034] Optionally, the heating medium is steam, high-temperature flue gas or high-temperature gas.

[0035] In some embodiments, the branch pipe 2 is extended up and down, the lower end of the branch pipe 2 is connected to the main pipe 1 , and the upper end of the branch pipe 2 is higher than the fin tube 202 .

[0036] It is known that, due to the natural ventilation of the intercooling tower 20 through the hyperbolic intercooling tower 20, ambient air is drawn in from all sides of the intercooling tower 20 and discharged from the middle of the intercooling tower 20, and the fin tube 202 extends vertically, so that the lowest temperature point of the fin tube 202 of the intercooling tower 20 is the upper end of the fin tube 202.

[0037] By extending the branch pipe 2 up and down, the branch pipe 2 matches the extension direction of the fin tube 202, so that the heating medium can cover the surface of the fin tube 202 along the annotation direction, increasing the contact area between the heating medium and the fin tube 202, thereby enhancing heat exchange, improving heat exchange efficiency, and thus improving the antifreeze effect.

[0038] In addition, the upper end of the branch pipe 2 is higher than the fin tube 202, so that the heating medium sprayed from the branch pipe 2 can fully contact the upper side of the fin tube 202, thereby improving the antifreeze effect on the upper end of the fin tube 202 and preventing the upper end of the fin tube 202 from icing.

[0039] Optionally, the branch pipe 2 extends in the vertical direction.

[0040] In this way, the matching degree between the branch pipe 2 and the fin tube 202 can be further improved, thereby improving the heat exchange efficiency.

[0041] In some embodiments, Figure 3 and Figure 4 As shown, a plurality of nozzles 211 are provided on the branch pipe 2 , and the plurality of nozzles 211 are arranged at intervals along the length direction of the branch pipe 2 .

[0042] The plurality of nozzles 211 are arranged at intervals along the extension direction of the fin tube 202 , and the heating medium sprayed from the plurality of nozzles 211 can evenly contact the fin tube 202 , thereby increasing the heat exchange area with the fin tube 202 , thereby further improving the heat exchange efficiency to achieve a better antifreeze effect.

[0043] Alternatively, if Figure 3 As shown, two groups of nozzles 211 are provided. The two groups of nozzles 211 are arranged on both sides of the branch pipe 2 in a radial direction thereof. The multiple nozzles 211 in the same group are evenly arranged in an axial direction of the branch pipe 2 .

[0044] In some embodiments, a nozzle 21 is provided on the branch pipe 2 , a nozzle 211 is formed at the end of the nozzle 21 , and the axis of the nozzle 21 is perpendicular to the radial direction of the tower 201 .

[0045] It is known that Figure 3 As shown, ambient air enters the triangular fin tube bundle along the radial direction of the tower 201 .

[0046] By arranging the axis of the nozzle 21 perpendicularly to the radial direction of the tower 201, the ejection direction of the heating medium is almost perpendicular to the air intake direction of the ambient air near the branch pipe 2; thus, the heating medium ejected from the nozzle 211 is fully mixed with the ambient air and flows through the fin tube 202, so as to mix and heat the ambient air entering the radiator, thereby ensuring the cooling efficiency of the ambient air on the circulating water in the intercooler 20 while preventing freezing.

[0047] Alternatively, if Figure 4 As shown, the branch pipe 2 is arranged between two adjacent air inlets 203 , and the spraying directions of the two groups of nozzles 211 on the branch pipe 2 are opposite.

[0048] Thus, the heating medium sprayed from the two groups of nozzles 211 on the branch pipe 2 can be mixed with the ambient air on both sides of the branch pipe 2 at the same time, thereby improving the antifreeze efficiency.

[0049] As an example, Figure 2 and Figure 3 As shown, the number of branch pipes 2 is less than the number of air inlets 203 . In other words, there are multiple air inlets 203 between two adjacent branch pipes 2 .

[0050] Of course, in other embodiments, the number of branch pipes 2 may be equal to or greater than the number of air inlets 203, and then at least one air inlet 203 is provided between every two adjacent air inlets 203.

[0051] It is understandable that those skilled in the art can determine the number of branch pipes 2 and nozzles 211 based on parameters such as the winter temperature of the area where the air cooling tower is located and the cooling performance of the air cooling tower.

[0052] In some embodiments, Figure 3 As shown, the intercooling tower antifreeze system 10 further includes a support member 3 , through which the branch pipe 2 is connected to the intercooling tower 20 ; and / or two adjacent branch pipes 2 are connected through the support member 3 .

[0053] The support member 3 can be used to connect and reinforce the branch pipe 2 with the intercooling tower 20 and adjacent branch pipes 2, so that multiple branch pipes 2 are connected as one, thereby improving the stability of the branch pipe 2 and further improving the stability of the intercooling tower antifreeze system 10.

[0054] As an example, Figure 1 and Figure 4 As shown, the support member 3 is a support rod made of a steel structure, the support rod used to connect the branch pipe 2 and the intercooler 20 is a first support rod 31 , and the support rod used to connect two adjacent branch pipes 2 is a second support rod 32 .

[0055] The two ends of the first support rod 31 are respectively fixed to the outer wall of the intercooling tower 20 and the branch pipe 2 to achieve the connection between the branch pipe 2 and the intercooling tower 20. Two first support rods 31 are arranged between each branch pipe 2 and the intercooling tower 20. The two first support rods 31 are arranged at intervals in the vertical direction and correspond to the two ends of the branch pipe 2 respectively, so as to improve the stability of the connection between the branch pipe 2 and the intercooling tower 20.

[0056] The second support rod 32 is arranged at the upper end of the branch pipe 2, the upper ends of two adjacent branch pipes 2 are respectively fixed to the two ends of the second support rod 32, and the lower ends of the two adjacent branch pipes 2 are connected to the main pipe 1, thereby making the two adjacent branch pipes 2 firmly connected.

[0057] In some embodiments, at least one of the main pipeline 1 and the branch pipeline 2 is provided with a valve 45 .

[0058] By setting valve 45, the total amount of heating medium introduced into the main pipeline 1 and the amount of heating medium introduced into each branch pipeline 2 can be controlled according to the operating status of the intercooling tower 20, thereby ensuring that the intercooling tower 20 operates efficiently under the premise of antifreeze and realizing cooling of the circulating water in the fin tube 202.

[0059] Optionally, valves 45 are provided on both the main pipeline 1 and the branch pipeline 2 .

[0060] Optionally, the valve 45 is an electric valve.

[0061] Thus, the opening of the valve 45 of the main pipeline 1 and the branch pipeline 2 can be remotely controlled to improve the convenience of operation.

[0062] In some embodiments, the fin tube 202 has a water outlet (not shown in the figure), and the water outlet is provided with a temperature monitoring device.

[0063] The circulating water cooled by the intercooler 20 is discharged from the outlet of the fin tube 202. By providing a temperature monitoring device at the water outlet of the fin tube 202, the temperature of the circulating water at the outlet of the fin tube 202 can be monitored in real time to adjust the opening of the valve 45 of the main pipeline 1 and the branch pipeline 2, thereby ensuring the efficient operation of the intercooler 20 under the premise of anti-freezing and realizing the cooling of the circulating water in the fin tube 202.

[0064] For example, when the temperature of the circulating water at the outlet of the fin tube 202 drops to a low-temperature preset value, the valves 45 of the main pipe 1 and the branch pipe 2 can be controlled to open and the antifreeze system can be started; when the temperature of the circulating water at the outlet of the fin tube 202 rises to a high-temperature preset value, the antifreeze system can be turned off; in addition, when the temperature of the circulating water at the outlet of the fin tube 202 is between the low-temperature preset value and the high-temperature preset value, the opening of the valves 45 of the main pipe 1 and the branch pipe 2 can also be adjusted according to the temperature of the circulating water at the outlet of the fin tube 202, thereby ensuring that the intercooler 20 operates efficiently under the premise of antifreeze.

[0065] Optionally, the temperature monitoring device is a temperature sensor 43 .

[0066] In some embodiments, Figure 5 As shown, the intercooler antifreeze system 10 further includes a host 41 , and the temperature monitoring device and the valve 45 are both electrically connected to the host 41 .

[0067] Through the above settings, the temperature monitoring device can transmit the temperature signal to the host 41. The host 41 analyzes the temperature signal, calculates the opening of the valve 45 of the main pipeline 1 and each branch pipeline 2, and then sends a control signal to each valve 45 to adjust the opening of the valve 45, change the amount of heating medium introduced, and maintain the circulating water temperature in the fin tube 202 at the set antifreeze temperature, thereby achieving the purpose of antifreeze.

[0068] like Figure 5 As shown, the intercooler antifreeze system 10 further includes a collection box 42 and a valve actuator 44 . The temperature sensor 43 is electrically connected to the host 41 through the collection box 42 , and the valve 45 is electrically connected to the host 41 through the valve actuator 44 .

[0069] Therefore, the collection box 42 can collect the temperature signal of the temperature sensor 43 and transmit the signal to the host 41. The host 41 analyzes the temperature signal, calculates the opening of each valve 45 through its internal flue gas antifreeze module, and then sends a control signal to the valve actuator 44 to control the opening of each valve 45 through the valve actuator 44.

[0070] The thermal power generating set of the embodiment of the present invention comprises a boiler, an intercooling tower 20 and an intercooling tower antifreeze system 10. The intercooling tower antifreeze system 10 is the intercooling tower antifreeze system 10 of any of the above embodiments.

[0071] The thermal power generating set in the embodiment of the present invention can spray heating medium onto the surface of the fin tube 202 through the antifreeze system when the temperature is low in winter, so that the fin tube 202 is kept at the antifreeze temperature, and the fin tube 202 is prevented from freezing, cracking, etc., so that the thermal power generating set maintains low back pressure operation, reduces operation and maintenance costs, and improves power generation efficiency.

[0072] In some embodiments, the thermal power generating set further includes a smoke exhaust pipe connected to the boiler, and the smoke exhaust pipe is connected to the main pipeline 1 through a connecting port 111 .

[0073] Through the above arrangement, part of the high-temperature flue gas generated by boiler combustion is discharged into the main pipeline 1 of the antifreeze system, making full use of resources, so that the thermal power generating set can maintain operation under a lower back pressure in winter, improve power generation efficiency, reduce the operation and maintenance cost of the intercooler 20, and has better economy.

[0074] In the description of the present invention, it is to 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”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0075] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0076] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0077] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0078] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An indirect cooling tower antifreeze system (10), characterized in that: The intercooling tower (20) comprises a tower (201) and finned tubes (202) arranged at the lower side of the tower (201); the intercooling tower antifreeze system (10) comprises a main pipeline (1) and a plurality of branch pipelines (2); the main pipeline (1) extends along the circumference of the intercooling tower (20); the main pipeline (1) is provided with a connecting port (111) for introducing a heating medium; the branch pipeline (2) is connected to the main pipeline (1); the plurality of branch pipelines (2) are arranged at intervals along the circumference of the intercooling tower (20); and the branch pipeline (2) has a nozzle (211) arranged toward the finned tube (202).

2. The intercooling tower antifreeze system (10) according to claim 1, characterized in that: The branch pipe (2) is extended upward and downward, the lower end of the branch pipe (2) is connected to the main pipe (1), and the upper end of the branch pipe (2) is higher than the fin tube (202).

3. The intercooling tower antifreeze system (10) according to claim 2, characterized in that: The branch pipe (2) is provided with a plurality of nozzles (211), and the plurality of nozzles (211) are arranged at intervals along the length direction of the branch pipe (2).

4. The intercooling tower antifreeze system (10) according to claim 3, characterized in that: The branch pipe (2) is provided with a nozzle (21), the end of the nozzle (21) forms the nozzle (211), and the axis of the nozzle (21) is perpendicular to the radial direction of the tower (201).

5. The intercooling tower antifreeze system (10) according to claim 1, characterized in that: It also comprises a support member (3), and the branch pipeline (2) is connected to the intercooling tower (20) via the support member (3); and / or Two adjacent branch pipes (2) are connected via the support member (3).

6. The intercooling tower antifreeze system (10) according to any one of claims 1 to 5, characterized in that: At least one of the main pipeline (1) and the branch pipeline (2) is provided with a valve (45).

7. The intercooling tower antifreeze system (10) according to claim 6, characterized in that: The fin tube (202) has a water outlet, and the water outlet is provided with a temperature monitoring device.

8. The intercooling tower antifreeze system (10) according to claim 7, characterized in that: It also includes a host (41), and the temperature monitoring device and the valve (45) are both electrically connected to the host (41).

9. A thermal power generating unit, characterized in that: include: boiler; Intercooler (20); An intercooling tower antifreeze system (10), wherein the intercooling tower antifreeze system (10) is the intercooling tower antifreeze system (10) according to any one of claims 1 to 8.

10. The intercooling tower antifreeze system (10) according to claim 9, characterized in that: It also comprises a smoke exhaust pipe connected to the boiler, wherein the smoke exhaust pipe is connected to the main pipe (1) via the connecting port (111).

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