Dual-condensation defogging device of cooling tower

Abstract

A dual-condensation fog-expelling device of a cooling tower effectively solves the problems that evaporation loss of low-temperature water is large, and fog appears and the like, and comprises a support, a cooling tower fan is installed on the support, an air suction cover is fixed above the cooling tower fan, the air suction cover is communicated with the cooling tower fan in an up-and-down mode, and condensation devices and air cooling devices are installed on the left side and the right side in the air suction cover. The air cooling device is located outside the condensing device, and a plurality of air outlets are formed in the left end and the right end of the air suction cover.

Description

Technical Field

[0001] This utility model belongs to the field of cooling tower technology, and in particular relates to a dual condensation and demisting device for cooling towers. Background Technology

[0002] When the hot saturated gas extracted by the cooling tower fan passes through the condensation module, the hot saturated gas exchanges heat with the low-temperature water, lowering the temperature of the hot saturated gas and causing water molecules in the hot saturated gas to condense and precipitate, achieving the purpose of steam-water separation and demisting. However, existing technologies suffer from significant low-temperature water evaporation losses and are prone to plume problems. Plume problems mainly occur in mechanically ventilated cooling towers, especially during winter operation in cold regions, where plumes form at the cooling tower outlet, impacting the surrounding ecological environment. Utility Model Content

[0003] In view of the above situation and to overcome the defects of the existing technology, the purpose of this utility model is to provide a dual condensation and demisting device for cooling towers, which effectively solves the problems of excessive water evaporation loss at low temperatures and the occurrence of plume mist.

[0004] The technical solution to the technical problem is as follows: it includes a support frame, on which a cooling tower fan is installed. An air suction hood is fixed above the cooling tower fan. The air suction hood is connected vertically to the cooling tower fan. A condensing device and an air cooling device are installed on both the left and right sides inside the air suction hood. The air cooling device is located outside the condensing device. Multiple air outlets are provided at both ends of the air suction hood.

[0005] Preferably, the condensation device includes a low-temperature water supply pump and a condensation module. The low-temperature water supply pump is mounted on a bracket and connected to the condensation module via a water pipe. The other end of the condensation module is provided with a water outlet pipe. The bracket is provided with a condensate tank associated with the low-temperature water supply pump, and the other end of the water outlet pipe is connected to the condensate tank.

[0006] Preferably, the condensation module consists of multiple U-shaped pipes connected in sequence.

[0007] Preferably, the air-cooling device includes an air-cooling exhaust fan and an air-cooling module. The air-cooling module is composed of multiple vertically oriented finned tubes, with the lower end of the finned tubes connected to the outside and the upper end of the finned tubes connected to the air-cooling exhaust fan.

[0008] This invention has the following advantages over traditional equipment: The condensing module uses low-temperature water as the cooling medium. Through multiple U-shaped pipes connected in series, it can effectively reduce the temperature of the hot saturated gas and achieve steam-water separation. Then, combined with the air-cooling module, heat exchange is carried out again to achieve deeper steam-water separation and demisting. The combination of the condensing module and the air-cooling module reduces the evaporation loss of low-temperature water, making it energy-saving and environmentally friendly. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the front view of this utility model;

[0010] Figure 2 This is a schematic diagram of the side view of the condensation device in this utility model;

[0011] Figure 3 This is a schematic diagram of the side view of the hollow cooling device of this utility model.

[0012] Reference numerals in the attached diagram: 1. Support frame; 2. Cooling tower fan; 3. Air suction hood; 4. Air outlet; 5. Low-temperature water supply pump; 6. Condensation module; 7. Water outlet pipe; 8. Air-cooled exhaust fan; 9. Air-cooled module. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0014] Depend on Figures 1 to 3 A dual condensation and demisting device for a cooling tower is provided, including a support 1, a cooling tower fan 2 installed on the support 1, an air suction hood 3 fixed above the cooling tower fan 2, the air suction hood 3 being vertically connected to the cooling tower fan 2, a condensation device and an air cooling device being installed on both the left and right sides inside the air suction hood 3, the air cooling device being located outside the condensation device, and multiple air outlets 4 being provided at both the left and right ends of the air suction hood 3.

[0015] The condensation device includes a low-temperature water supply pump 5 and a condensation module 6. The low-temperature water supply pump 5 is mounted on a bracket 1 and is connected to the condensation module 6 via a water pipe. The other end of the condensation module 6 is provided with a water outlet pipe 7. The bracket 1 is provided with a condensate tank associated with the low-temperature water supply pump 5, and the other end of the water outlet pipe 7 is connected to the condensate tank.

[0016] The condensation module 6 consists of multiple U-shaped pipes, which are connected in sequence.

[0017] The air-cooling device includes an air-cooling exhaust fan 8 and an air-cooling module 9. The air-cooling module 9 is composed of multiple vertically oriented finned tubes. The lower end of the finned tubes is connected to the outside, and the upper end of the finned tubes is connected to the air-cooling exhaust fan 8.

[0018] When this utility model is in use, the cooling tower fan 2, the low-temperature water supply pump 5, and the air-cooled exhaust fan 8 are started. The hot saturated gas in the cooling tower fan 2 is pressurized into the suction hood 3. The hot saturated gas in the suction hood 3 moves to the left and right sides. The hot saturated gas first enters the condensation module 6. The low-temperature water supply pump 5 continuously pressurizes the condensate in the condensate tank into the condensation module 6. The condensate that flows continuously in the U-shaped pipe and the hot saturated gas pass around the U-shaped pipe. The condensation module 6 exchanges heat with the hot saturated gas, which cools the hot saturated gas, thereby achieving the purpose of steam-water separation. The condensate after heat exchange flows back into the condensate tank.

[0019] After heat exchange, the gas flows to the air-cooled module 9. The air-cooled exhaust fan 8 draws cold air from the outside environment into the finned tubes of the air-cooled module 9. The temperature of the outside environment air is lower than the temperature of the hot saturated gas. The cold air from the outside environment moves upward in the finned tubes, thereby reducing the temperature around the finned tubes. The gas after heat exchange passes around the finned tubes and exchanges heat with the air-cooled module 9 again, allowing the steam and water to be separated at a deeper level, resulting in drier gas. The dried gas is discharged to the outside through the air outlet 4. The water absorbed by the condenser and the air-cooling device flows through the pipes to the cooling tower water pool.

[0020] Theoretical and applied basis for vapor-water separation and demisting:

[0021] 1) Cooling tower operating parameters:

[0022] Cooling tower water processing capacity air volume Water replenishment Water replenishment temperature thermal saturated gas temperature Ambient temperature <![CDATA[4000m 3 / h]]> <![CDATA[260×10 4 m 3 / h]]> <![CDATA[60m 3 / h]]> 10～15℃ 40℃ 25℃

[0023] 2) Condensation module design parameters:

[0024]

[0025] 3) Theoretical calculations

[0026] A. Calculation of steam-water separation in the condensation unit:

[0027] Calculation of heat absorption by refrigerant makeup water:

[0028] Q1=c1m1Δt1=4200×60000×15=3.78×10 9 (J / h);

[0029] Where: C1—specific heat capacity of water;

[0030] m1—mass of water (60m) 3 / h×1000=60000kg / h)

[0031] Δt1—The temperature difference between the inlet and outlet of the water (28℃-13℃=15℃).

[0032] Calculation of condensate precipitation when hot saturated gas is cooled:

[0033] Heat released: Q2 = Q1 × η = 3.78 × 10 9 ×0.8=3.024×10 9 (J / h);

[0034] (where η is the heat transfer efficiency)

[0035] Temperature drop of hot saturated gas: Δt2=Q2 / (c2m2)=3.024×10 9 / (1006×2.5×10 6 )≈1.2℃;

[0036] Where: C2—specific heat capacity of the thermally saturated gas;

[0037] m2—Mass of saturated gas with effective heat exchange (260×10⁻⁶) 4 m 3 / h×1.204×0.8=2.5×

[0038] 10 6 kg / h)

[0039] The amount of condensate that will be produced is 2.5 × 10⁻⁶. 6 ×0.0023×1.2=6900(kg / h).

[0040] B. Calculation of steam-water separation in air-cooled unit:

[0041] Calculation of heat absorption by cold air in the external environment:

[0042] Q3=c3m3Δt3=1006×481600×5=2.422×10 9 (J / h);

[0043] Where: C1—specific heat capacity of air;

[0044] m1—mass of air (40×10⁻⁶) 4 m 3 / h×1.204=481600kg / h)

[0045] Δt1—The temperature difference between the inlet and outlet of the water (30℃-25℃=5℃).

[0046] Calculation of condensate precipitation when hot saturated gas is cooled:

[0047] Heat released: Q2 = Q1 × η = 2.422 × 10 9 ×0.8=1.938×10 9 (J / h);

[0048] (where η is the heat transfer efficiency)

[0049] Temperature drop of hot saturated gas: Δt2=Q2 / (c2m2)=1.938×10 9 / (1006×2.5×10 6 )≈0.77℃;

[0050] Where: C2—specific heat capacity of the thermally saturated gas;

[0051] m2—Mass of saturated gas with effective heat exchange (260×10⁻⁶) 4 m 3 / h×1.204×0.8=2.5×

[0052] 10 6 kg / h)

[0053] The amount of condensate that will be produced is 2.5 × 10⁻⁶. 6 ×0.0023×0.77=4428(kg / h).

[0054] C. Total water collection from steam-water separation in condensing and air-cooling units:

[0055] 6900kg / h+4428kg / h=11328kg / h;

[0056] The daily water collection is approximately: 11328 × 24 / 1000 = 272 (tons).

[0057] D. Calculation of water absorption rate:

[0058] Flow rate 4000m 3 The evaporation loss per hour is: 4000 × 1% = 40 (m³) 3 / h);

[0059] The water recovery rate of the condenser and air-cooled unit is: 11328 / (40×1000)=28.3%.

[0060] The two methods of vapor-water separation described above can achieve excellent water collection and defogging effects.

[0061] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A dual condensation and demisting device for cooling towers, characterized in that, Includes a bracket (1), on which a cooling tower fan (2) is installed. A suction hood (3) is fixed above the cooling tower fan (2). The suction hood (3) is connected vertically to the cooling tower fan (2). A condensing device and an air-cooling device are installed on both the left and right sides inside the suction hood (3). The air-cooling device is located outside the condensing device. Multiple air outlets (4) are provided at both the left and right ends of the suction hood (3).

2. The cooling tower dual condensation and demisting device according to claim 1, characterized in that, The condensation device includes a low-temperature water supply pump (5) and a condensation module (6). The low-temperature water supply pump (5) is mounted on a bracket (1). The low-temperature water supply pump (5) is connected to the condensation module (6) via a water pipe. The other end of the condensation module (6) is provided with a water outlet pipe (7). The bracket (1) is provided with a condensate tank associated with the low-temperature water supply pump (5). The other end of the water outlet pipe (7) is connected to the condensate tank.

3. The cooling tower dual condensation and demisting device according to claim 2, characterized in that, The condensation module (6) consists of multiple U-shaped pipes connected in sequence.

4. The cooling tower dual condensation and demisting device according to claim 1, characterized in that, The air-cooling device includes an air-cooling exhaust fan (8) and an air-cooling module (9). The air-cooling module (9) is composed of multiple vertically oriented finned tubes. The lower end of the finned tubes is connected to the outside, and the upper end of the finned tubes is connected to the air-cooling exhaust fan (8).

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