Power plant cooling tower bottom windshield curtain system with anti-freezing heating device

Abstract

Provided is a power plant cooling tower bottom windshield curtain system with an anti-freezing heating device. The utility model relates to a wind shielding curtain system on a cooling tower of a power plant. The problem that a curtain body cannot ascend and descend due to freezing at a track is solved. The device comprises a plurality of curtain windproof units, each curtain windproof unit comprises two lifting guide rails, a curtain body, a curtain folding driving device and a plurality of cross beams, the cross beams are fixed to the surface of the curtain body in parallel, and the two ends of each cross beam are arranged in the corresponding lifting guide rail in a sliding fit mode; the first energy conversion device is used for diffusing heat energy into the lifting guide rail; and the power transmission and distribution system is connected with the first energy conversion device and transmits electric energy to the first energy conversion device. The temperature of the lifting guide rail of the anti-freezing heating device is always above zero, so that water vapor cannot be condensed into ice at the lifting guide rail, and the problem that the curtain body cannot be folded and fall down due to freezing at the lifting guide rail is solved.

Description

Technical Field

[0001] The utility model relates to a wind screen system on a cooling tower of a power plant. Background Art

[0002] At present, indirect air cooling systems are widely used in steam turbine generator sets in power plants. This cooling system can be safely used in sudden climate changes such as strong winds because of its strong output response delay capability. In particular, it is increasingly used in power plants in the northwest of my country where there is a lot of coal, water shortage, strong winds and high temperatures. In the future, air-cooled nuclear power plants with high safety requirements will also prefer indirect air cooling systems. However, in extremely cold weather, especially when the unit is running at reduced load or steam extraction, the heat dissipation capacity of the cooling tower installed at the design load is far greater than the current working conditions. There will be a large temperature difference in the water at the end of the tube or at a location with large air leakage, which may cause the water in the tube to freeze, resulting in deformation of the tube bundle or freezing and cracking of the heat transfer tube, posing a great threat to the safe operation of the unit.

[0003] The patent "An Indirect Cooling Tower with Antifreeze Device" with the authorization announcement number CN214010028U uses an antifreeze device to solve the problem that extremely cold weather in winter poses a great threat to the safe operation of the unit. The antifreeze device is to set a number of curtain windproof units 3 at the position of the vent 2 at the bottom of the cooling tower 1, and all the curtain windproof units 3 are arranged in sequence, surrounding each vent 2 at the bottom of the cooling tower 1. When extremely cold weather endangers the safety of the power plant unit, the curtain body 3-1 in the curtain windproof unit 3 is used to block part or all of all vents 2. When ventilation is needed, the curtain body 3-1 is opened to open the vent. The working principle of each curtain windproof unit 3 is as follows: On a curtain body 3-1 with an area slightly larger than the area of ​​the vent 2, a number of beams 3-2 are fixed in parallel from top to bottom, and these beams 3-2 serve as the keel when the curtain body 3-1 is folded. Two lifting guide rails 3-3 are respectively located at the two ends of the beam 3-2, and the two ends of the beam 3-2 are respectively set in one lifting guide rail 3-3 to achieve positioning and sliding. The bottom beam 3-2 is driven to rise by the pull rope 3-5 on the electric winch 3-4, and the curtain body 3-1 can be folded up and stored in turn. When the curtain body 3-1 is folded up, the vent 2 at the bottom of the cooling tower is opened, and when the curtain body 3-1 falls, the vent 2 is blocked.

[0004] The antifreeze device solves the problem of safe operation of the unit in winter to a certain extent. However, due to the humid environment inside the cooling tower and the easy icing of the metal lifting guide track 3-3, the cross beam 3-2 cannot move in the lifting guide track 3-3, so that the curtain body 3-1 cannot be raised or lowered due to ice on the track. Utility Model Content

[0005] The utility model aims to provide a bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device to solve the problem that the curtain body 3-1 cannot be raised and lowered due to ice on the track.

[0006] The windshield curtain system includes a plurality of curtain windproof units 3, each of which includes two lifting guide rails 3-3, a curtain body 3-1, a curtain folding drive device and a plurality of cross beams 3-2: the plurality of cross beams 3-2 are fixed in parallel in the horizontal direction on the surface of the curtain body 3-1, and the two ends of each cross beam 3-2 are respectively slidably fitted in a lifting guide rail 3-3; it also includes a first energy conversion device 11 that converts input electrical energy into heat energy and diffuses it into the lifting guide rail 3-3 arranged in contact with it; and a power transmission and distribution system connected to the above-mentioned first energy conversion device 11 and transmits electrical energy to it.

[0007] The utility model provides an anti-freezing heating device using the electric heating principle at the lifting guide track of the windshield curtain system, so that the temperature at the lifting guide track is always above zero, so that water vapor will not condense into ice here, thereby solving the problem that the curtain body 3-1 cannot be folded and dropped due to ice at the lifting guide track 3-3. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a structural schematic diagram of an existing power plant cooling tower and a curtain windproof unit 3 installed on a vent 2 at the bottom of the cooling tower; Figure 2 It is a three-dimensional structural diagram of the curtain windproof unit 3 (the curtain body 3-1 is removed); Figure 3 It is a schematic diagram of the side cross-sectional structure of the curtain windproof unit 3. Figure 4 is a structural diagram of the second implementation mode, Figure 5 yes Figure 4 Side view of. DETAILED DESCRIPTION

[0009] 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.

[0010] Specific implementation method 1: Combination Figures 2 to 3To illustrate this embodiment, the windshield curtain system includes a plurality of curtain windproof units 3, each of which includes two lifting guide rails 3-3, a curtain body 3-1, a curtain folding drive device and a plurality of cross beams 3-2: the plurality of cross beams 3-2 are fixed in parallel in a horizontal direction on the surface of the curtain body 3-1, and the two ends of each cross beam 3-2 are respectively slidably fitted in a lifting guide rail 3-3; it also includes a first energy conversion device 11 that converts input electrical energy into heat energy and diffuses it into the lifting guide rail 3-3 arranged in contact with it; and a power transmission and distribution system connected to the above-mentioned first energy conversion device 11 and transmits electrical energy to it. The curtain folding driving device includes an electric winch 3-4 and a pull rope 3-5. The pull rope 3-5 on the electric winch 3-4 drives the bottom beam 3-2 to rise, and the curtain body 3-1 can be folded up and stored in turn. When the curtain body 3-1 is folded up, the vent 2 at the bottom of the cooling tower is opened, and when the curtain body 3-1 falls, the vent 2 is blocked.

[0011] Preferably, a plurality of cross beams 3-2 are fixed on the surface of the curtain body 3-1 at equal intervals. With such arrangement, the curtain body 3-1 is easy to handle when folded and stored.

[0012] Specific implementation method 2: Combination Figure 4 The present embodiment is described. The difference between the present embodiment and the first embodiment is that it further includes a threshold 40, which is arranged between the bottoms of the two lifting guide rails 3-3. The threshold 40 is added to cooperate with the bottom of the lower end of the curtain 3-1 to block the wind blowing from the ground surface, and the sealing effect of the vent is better.

[0013] Preferably, the threshold 40 is provided with a second energy conversion device 12 that converts input electrical energy into heat energy and diffuses it to the threshold 40 arranged in close contact therewith, and the second energy conversion device 12 is connected to the power transmission and distribution system to obtain the input electrical energy. If the threshold temperature is low, it will also freeze and adhere to the curtain, affecting the operation of opening the vent. The energy conversion device 12 is provided to avoid the threshold 40 from freezing.

[0014] Specific implementation method three: The difference between this implementation method and implementation method one or implementation method two is that the first energy conversion device 11 and the second energy conversion device 12 are heating cables. In this way, the heating power is reasonable and it is easy to arrange on the guide track 3-3. The electric heating cable itself is a heating cable, which emits a certain amount of heat through heating media such as copper wire and sheath to achieve the working requirements of heating, constant temperature or antifreeze. It has the advantages of high thermal efficiency, energy saving, no pollution, and long service life.

[0015] Preferably, the heating belt is fixed on the outer side of the track along the height direction of the lifting guide track 3-3. Such arrangement does not block or interfere with the transmission of the curtain folding drive device, nor does it affect the lifting and lowering of the end of the crossbeam 3-2 in the guide track 3-3.

[0016] Preferably, the first energy conversion device 11 and the second energy conversion device 12 are self-limiting temperature heating belts. When the temperature rises, the conductive plastic produces micromolecular 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 micromolecular contraction state, 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 devices do not have. The temperature it controls will not be too high or too low because the temperature is automatically adjusted.

[0017] Preferably, Figure 5 As shown, the heating belt 11 is pressed onto the outer surface of the lifting guide track 3-3 through the pressure strip 32, and the pressure strip 11 is fixed to the outer surface of the lifting guide track 3-3 by bolts.

[0018] Specific embodiment 4: The difference between this embodiment and embodiment 1 or embodiment 2 is that the first energy conversion device 11 and the second energy conversion device 12 are heating plates, and the electric heating plate is an electric heating device that wraps a resistance heating wire around a mica board (mica sheet). The mica board (mica sheet) heater utilizes the good insulation performance and high temperature resistance of the mica board (mica sheet). It uses the mica board (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, cylinder, cone, tube, circle, etc. The normal surface load is 2.5-3W, and it can withstand a temperature of 500°C. It can be used in various industrial and agricultural heating occasions, such as mold heating, plastic machinery, and other heating and drying devices.

[0019] Preferably, the heating plate is a stainless steel electric heating plate. The shell of this product is made of stainless steel, is a molded product sold on the market, and works reliably.

[0020] Since the heating plate is installed on the lifting guide track 3-3 in this embodiment, the heating element has high reliability. The lowest 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 the lifting guide track 3-3 from freezing or even icing.

[0021] Preferably, the electric heating plate is arranged on the outer side of the track along the height direction of the lifting guide track 3-3. Such arrangement does not block or interfere with the transmission of the curtain folding drive device, nor does it affect the lifting of the end of the crossbeam 3-2 in the guide track 3-3.

[0022] Preferably, the outer shell of the electric heating plate 33 is fixed to the outer surface of the lifting guide rail 3 - 3 by bolts.

[0023] Specific implementation method five: The difference between this implementation method and implementation method one is that the power transmission and distribution system maintains the temperature on the heating plate stable through the control circuit, thereby controlling the temperature stability of the guide rail 3-3.

[0024] Specific implementation example 6: The difference between this implementation example and implementation example 1 is that the heating tape or electric heating plate is arranged on the bottom surface or side surface of the threshold 40 along the length direction of the threshold 40 .

[0025] 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. A windshield curtain system at the bottom of a cooling tower of a power plant with an anti-freezing heating device, the windshield curtain system comprising a plurality of curtain windshield units (3), each curtain windshield unit (3) comprising two lifting guide rails (3-3), a curtain body (3-1), a curtain folding drive device and a plurality of cross beams (3-2): the plurality of cross beams (3-2) are fixed in parallel on the surface of the curtain body (3-1) in a horizontal direction, and the two ends of each cross beam (3-2) are respectively slidably fitted in a lifting guide rail (3-3); Features: It also includes a first energy conversion device (11) that converts input electrical energy into thermal energy and diffuses it into a lifting guide rail (3-3) arranged in close proximity thereto; and a power transmission and distribution system that is connected to the first energy conversion device (11) and transmits electrical energy thereto.

2. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 1, characterized in that: A plurality of cross beams (3-2) are fixed on the surface of the curtain body (3-1) at equal intervals.

3. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 1, characterized in that: It also comprises a threshold (40), and the threshold (40) is arranged between the bottoms of two lifting guide rails (3-3).

4. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 1, 2 or 3, characterized in that: The first energy conversion device (11) is a heating belt.

5. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 4, characterized in that: The heating belt is fixed on the outer side surface of the lifting guide track (3-3) along the height direction of the track.

6. The wind curtain system at the bottom of a cooling tower of a power plant with an anti-freezing heating device according to claim 1, 2 or 3, characterized in that: The first energy conversion device (11) is a self-limiting temperature heating belt.

7. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 1, 2 or 3, characterized in that: The first energy conversion device (11) is a heating plate.

8. The wind curtain system at the bottom of a cooling tower of a power plant with an anti-freezing heating device according to claim 7, characterized in that: The heating plate should be a stainless steel electric heating plate.

9. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 1, characterized in that: The power transmission and distribution system maintains a stable temperature on the heating plate through a control circuit.

10. The bottom wind curtain system of a power plant cooling tower with an anti-freezing heating device according to claim 3, characterized in that: The threshold (40) is provided with a second energy conversion device (12) for converting input electrical energy into heat energy and diffusing the heat energy to the threshold (40) arranged in close contact with the threshold, and the second energy conversion device (12) is connected to the power transmission and distribution system to obtain the input electrical energy; The second energy conversion device (12) is a heating tape or an electric heating plate. The second energy conversion device (12) is arranged on the bottom surface or side surface of the door sill (40) along the length direction of the door sill (40).

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