Anti-freezing device for top outer eave of tower drum of cooling water tower of power plant

Abstract

The utility model relates to an anti-freezing device for a power plant cooling water tower, in particular to an anti-freezing device for an outer eave of the top of a tower drum of the power plant cooling water tower. The problem that the outer eave of the tower is frozen or even frozen is solved. According to the technical scheme, the system comprises an energy conversion device which converts input electric energy into heat energy and diffuses the heat energy to a tower outer eave attached to the energy conversion device; the auxiliary device is used for arranging the energy conversion device on the outer eave of the tower; and the power transmission and distribution system is connected with the energy conversion device and transmits electric energy to the energy conversion device. The anti-freezing device adopting the electric heating principle is arranged at the concrete part of the tower outer eave at the top of the tower drum of the cooling tower, so that the temperature of a concrete member at the concrete part is always above zero, and the concrete member cannot be condensed into ice at the concrete part. When the cooling tower operates in winter, the reasonable operation scheme and the scientific melting and deicing mode can avoid or reduce the operation risk caused by freezing of the cooling tower, meanwhile, the operation energy efficiency of the system can be improved, and the service life of the cooling tower is prolonged.

Description

Technical Field

[0001] The utility model relates to an antifreeze device used on a cooling water tower of a power plant. Background Art

[0002] In the winter in the north, the temperature can drop below freezing. Figure 1 As shown, after the temperature drops, the inner and outer edges of the outer eaves S1 (annular concrete component located at the top of the tower, hereinafter referred to as the tower eaves) of the cooling tower of the power plant will form ice cones due to the condensation of water vapor from the hot and humid air out of the tower. In severe cases, large ice blocks will form, increasing the load on the top of the tower, and even falling and injuring the equipment and pedestrians below. The freezing of the cooling tower will not only pose a serious threat to the safe and economical operation of the cooling tower, but the freeze-thaw cycle will also damage the concrete components and greatly reduce the service life of the cooling tower. Therefore, it is necessary to solve the problem of freezing and even freezing of the tower eaves S1. Utility Model Content

[0003] The utility model aims to provide an antifreeze device for the outer eaves at the top of a cooling water tower of a power plant, so as to solve the problem of freezing or even ice formation of the outer eaves of the tower.

[0004] An antifreeze device for the outer eaves of the top of a cooling water tower of a power plant, comprising:

[0005] An energy conversion device that converts input electrical energy into heat energy and diffuses it to the outer eaves of the tower that is arranged in close proximity to it;

[0006] Auxiliary device for arranging the energy conversion device on the outer eaves of the tower; and

[0007] A power transmission and distribution system connected to the above energy conversion device and transmitting electrical energy to it.

[0008] The utility model sets an antifreeze device using the electric heating principle at the concrete of the outer eaves S1 at the top of the cooling tower, so that the temperature of the concrete component at this location is always above zero, so that water vapor will not condense into ice at this location, thus solving the serious threat of ice to the safe operation of the cooling tower and ensuring its normal operation. When the cooling tower is operating in winter, a reasonable operation plan plus a scientific deicing method can not only avoid or reduce the operating risks caused by ice formation in the cooling tower, but also improve the system operation energy efficiency and extend the service life of the cooling tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the cooling tower of a power plant; Figure 2 for Figure 1 A local enlarged schematic diagram of the H in the middle; Figure 3 for Figure 2 AA section view; Figure 4 This is the electrical control principle diagram of the utility model. Figure 5 is a top view of the second embodiment; Figure 6 yes Figure 5 BB cross-sectional view. Figure 7 It is a three-dimensional schematic diagram of the top of the cooling tower after the antifreeze device of this embodiment is installed in the second embodiment. DETAILED DESCRIPTION

[0010] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0011] Specific implementation method 1: Combination Figures 1 to 3 To illustrate this embodiment, this embodiment includes: an energy conversion device that converts input electrical energy into thermal energy and diffuses it to the outer edge of a tower arranged in close proximity thereto; an auxiliary device that arranges the above-mentioned energy conversion device on the outer edge of the tower; and a power transmission and distribution system that is connected to the above-mentioned energy conversion device and transmits electrical energy to it.

[0012] In this embodiment, the energy conversion device is an electric heating cable 1, and the auxiliary device is a metal pipe 2, which is fixed around the outer wall surface of the tower eaves S1, or can be half-buried or fully buried in the outer wall surface, and the electric heating cable 1 is arranged in the inner cavity of the metal pipe 2. In order to improve the heat conduction efficiency and save energy, the metal pipe 2 is preferably in close contact with the outer wall surface.

[0013] Preferably, the metal tube 2 is a steel tube, an aluminum alloy tube or a copper tube. The above-mentioned tubes have good thermal conductivity.

[0014] Preferably, the electric heating cable body 1 and the metal pipe 2 are surrounded on the outer wall surface of the tower outer eaves S1 in multiple circles distributed at uniform distances, for example four circles. In this way, heat conduction and protection are uniform.

[0015] Preferably, the power transmission and distribution system includes a junction box 3 and a power supply 6, and the electric heating cable body 1 is arranged into sections at a certain distance and connected to the power supply 6 through the connection terminals of the junction box 3. The electric heating cable body 1 is divided into multiple sections by the junction box 3, which is convenient for maintenance and replacement.

[0016] Preferably, the power transmission and distribution system also includes a controller 4, a temperature sensor 5 and a controllable switch 7. The temperature sensor 5 is installed on the outer wall surface of the tower eaves S1. The signal output end of the temperature sensor 5 is connected to the signal input end of the controller 4. The control signal output end of the controller 4 is connected to the controlled end of the controllable switch 7. The controllable switch 7 is installed between the junction box 3 and the electric heating tape body 1.

[0017] Preferably, the power transmission and distribution system further includes a controller 4, the connection terminals of the junction box 3 are connected to the electric heating belt body 1 through the controllable switch 7, the control signal output end of the controller 4 is connected to the controlled signal input end of the controllable switch 7, and the power supply of the electric heating belt body 1 is automatically turned on or off through a preset program. In this way, the heating time can be automatically adjusted according to the temperature changes within a day.

[0018] Preferably, it also includes a temperature sensor 5, which is installed on the outer wall surface of the tower eaves S1, and the signal output end of the temperature sensor 5 is connected to the signal input end of the controller 4. In this way, it can automatically control whether to work according to the actual temperature of the outer wall surface.

[0019] Preferably, the electric heating belt body 1 is a self-limiting temperature heating belt. When the temperature rises, the conductive plastic produces micro-molecular expansion, the carbon particles gradually separate, causing the circuit terminal, the resistance rises, and the heating belt automatically reduces the power output. When the temperature becomes cold, the plastic returns to the state of micro-molecular contraction, the carbon particles are connected accordingly, forming a circuit, and the heating power of the heating belt automatically rises. The self-limiting temperature heating belt has advantages that other heating equipment does not have. The temperature it controls will not be too high or too low because the temperature is automatically adjusted.

[0020] The electric heating cable itself is a heating cable that emits a certain amount of heat through copper wire, sheath and other heating media to achieve the working requirements of heating, constant temperature or antifreeze. It is a high-tech product with high thermal efficiency, energy saving, no pollution, long service life, and is a key energy-saving project promoted by the state. However, it is not currently used on the outer eaves of the top of the cooling tower of a power plant.

[0021] Specific implementation method 2: Combination Figures 5 to 7 This embodiment is described. The difference between this embodiment and the first embodiment is that the energy conversion device is a heating plate 11. The heating plate 11 is a stainless steel electric heating plate, which is a molded product sold on the market. The plate body of the heating plate 11 is cylindrical and is attached and fixed on the outer circumferential surface of the tower eaves S1. The stainless steel electric heating plate is an electric heating device that wraps a resistance heating wire around a mica plate (mica sheet). The mica plate (mica sheet) heater utilizes the good insulation performance and high temperature resistance of the mica plate (mica sheet). It uses the mica plate (sheet) as the skeleton and insulation layer, supplemented by galvanized sheet or stainless steel sheet for support and protection. It can be made into various shapes of heating devices such as plate, sheet, cylindrical, conical, cylindrical, and circular. The normal surface load is 2.5-3W, and the temperature can be 500℃. It can be used in various industrial and agricultural heating occasions, such as mold heating, plastic machinery, and other heating and drying devices.

[0022] Preferably, the cross section of the outer shell of the heating plate 11 is "channel steel shaped", and the channel steel shaped heating plate 11 is buckled on the protruding, rectangular shoulder-shaped part of the tower outer edge S1. In this way, the contact area between the heating plate 11 and the tower outer edge S1 is large, the heat conduction efficiency is relatively high, the structure is compact and the mechanical structure of the connection is reasonable.

[0023] Preferably, the auxiliary device is implemented by an anchoring structure; the anchoring structure includes a plurality of fences 12, a plurality of fence side U-shaped bolts 15, a plurality of plate side U-shaped bolts 16, a support frame 13 and at least one transition beam 14; the cylindrical support frame 13 is arranged around the outer surface of the heating plate 11, a plurality of fences 12 are evenly arranged around the inner surface of the support frame 13, and the lower end of the fence 12 is buried and fixed in the concrete matrix of the tower outer edge S1, the fence 12 is fixed to the transition beam 14 through the fence side U-shaped bolts 15, the transition beam 14 is fixed to the upper half of the plate surface of the support frame 13 through the plate side U-shaped bolts 16, and the heating plate 11 is fixed to the lower half of the plate surface of the support frame 13. Such an arrangement strengthens the structural fixation of the heating plate 11 on the tower outer edge S1, and is also conducive to high-altitude work during installation and disassembly step-by-step connection.

[0024] Preferably, the power transmission and distribution system can control the temperature stability of the heating plate 11 through the control circuit, and further control the temperature stability of the tower eaves S1.

[0025] Since the present embodiment installs a heating plate around the outer side of the upper part of the cooling tower, the heating plate can control heating in different zones, and the heating element has high reliability and can meet the operation mode of one in use and one in standby. The lowest point of the surface temperature of the heating plate should reach +25°C under the conditions of ambient temperature -40°C and wind force 10, thereby achieving the purpose of preventing freezing or even ice formation around the outer side of the upper part of the cooling tower, and ensuring the safety of equipment and personnel under the cooling tower.

[0026] The present invention has been disclosed as above in the form of a preferred embodiment, but it is not intended to limit the present invention. Any simple modification, equivalent changes and modifications made to the above implementation cases by any professional and technical personnel who do not deviate from the content of the technical solution of the present invention and based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Antifreeze device for the top outer eaves of cooling towers in power plants, characterized by It includes: An energy conversion device that converts input electrical energy into heat energy and diffuses it to the outer eaves of the tower that is arranged in close proximity to it; Auxiliary device for arranging the energy conversion device on the outer eaves of the tower; and A power transmission and distribution system connected to the above energy conversion device and transmitting electric energy to it; The energy conversion device is an electric heating tape (1), and the auxiliary device is a metal tube (2). The metal tube (2) is fixed around the outer wall surface of the tower eaves (S1), or is half-buried or fully buried in the outer wall surface; the electric heating tape (1) is arranged in the inner cavity of the metal tube (2).

2. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 1, characterized in that: The electric heating cable body (1) and the metal pipe (2) are surrounded on the outer wall surface of the tower outer eaves (S1) in multiple circles distributed at uniform distances.

3. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 1, characterized in that: The power transmission and distribution system comprises a junction box (3) and a power supply (6). The electric heating tape (1) is arranged in sections at regular intervals and is connected to the power supply (6) via the connection terminals of the junction box (3).

4. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 3, characterized in that: The power transmission and distribution system further comprises a controller (4), a temperature sensor (5) and a controllable switch (7); the temperature sensor (5) is mounted on the outer wall surface of the tower eaves (S1); the signal output end of the temperature sensor (5) is connected to the signal input end of the controller (4); the control signal output end of the controller (4) is connected to the controlled end of the controllable switch (7); and the controllable switch (7) is mounted between the junction box (3) and the electric heating tape body (1).

5. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 1, characterized in that: The electric heating belt body (1) is a self-limiting temperature heating belt.

6. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 1, characterized in that: The energy conversion device is a heating plate (11), and the plate body of the heating plate (11) is cylindrical and is attached and fixed on the outer circumferential surface of the tower outer eaves (S1).

7. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 6, characterized in that: The cross section of the shell of the heating plate (11) is in the shape of a "channel steel", and the channel steel-shaped heating plate (11) is buckled onto a protruding, rectangular shoulder-shaped portion of the tower outer eaves (S1).

8. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 6, characterized in that: The auxiliary device is implemented by an anchoring structure; the anchoring structure comprises a plurality of fences (12), a plurality of fence side U-shaped bolts (15), a plurality of plate side U-shaped bolts (16), a support frame (13) and at least one transition beam (14); the cylindrical support frame (13) is arranged around the outer surface of the heating plate (11), a plurality of fences (12) are evenly arranged around the inner side of the inner surface of the support frame (13), and the lower end of the fence (12) is buried and fixed in the concrete matrix of the tower outer eaves (S1), the fence (12) is fixed to the transition beam (14) by the fence side U-shaped bolts (15), the transition beam (14) is fixed to the upper half of the plate surface of the support frame (13) by the plate side U-shaped bolts (16), and the heating plate (11) is fixed to the lower half of the plate surface of the support frame (13).

9. The antifreeze device for the top outer eaves of a cooling tower of a power plant according to claim 6, characterized in that: The power transmission and distribution system controls the temperature stability of the heating plate (11) through a control circuit, thereby controlling the temperature stability of the tower eaves (S1).

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