Mixed ventilation direct air-cooling system vertically arranged outside air-cooling condenser tower

Abstract

The invention disclose a mixed ventilation direct air-cooling system which is vertically arranged outside an air-cooling condenser tower and belongs to the field of power station cooling systems. The mixed ventilation direct air-cooling system comprises a hyperbolic air-cooling tower, air-cooling condenser units and axial flow fans; the air-cooling condenser units and the axial flow fans are vertically and circumferentially arranged at an air inlet of the air-cooling tower; finned tube bundle structures of the air-cooling condenser units are divided into 6-8 cooling fan sections that are vertically and circumferentially arranged on a tower bottom base station; each air-cooling condenser unit comprises two groups of radiating finned tube bundles; and louvers are arranged at air inlets of the air-cooling condenser units. The mixed ventilation direct air-cooling system is insensitive to the wind direction, so that the stability of generator operation can be improved. Air is driven by a mechanical ventilation mode, and pumping action on the air by the air-cooling tower is used fully, so that supply air rates of the air-cooling condenser units are increased to a great extent, the cooling capacity of air-cooling condensers in a summer can be improved substantially, the cooling effect is good, the economy is high, the external factor influence is little, and the environmental suitability and the operational control flexibility of the mixed ventilation direct air-cooling system are improved.

Description

technical field [0001] The invention belongs to the field of power station cooling systems, in particular to a mixed ventilation direct air cooling system arranged vertically outside an air-cooled condenser tower. Background technique [0002] Due to its significant water-saving advantages, direct air cooling technology has been widely used in coal-fired power stations in my country's coal-rich and water-scarce northern regions in recent years. The direct air-cooling system is composed of dozens of air-cooled condenser units arranged in a rectangular array. The finned tube bundles are in a "^"-shaped structure and are arranged on both sides of the air-cooling unit. The exhaust steam of the steam turbine in the unit finned tube bundle is cooled, and the steam is condensed into water and collected by the condensed water tank. The finned tube bundle and the fan group are supported on the air-cooled platform by pillars. The air-cooled platform is often tens of meters high to pro...

AI Technical Summary

Problems solved by technology

[0004] 1. It is greatly affected by the ambient temperature

The higher the ambient temperature, the worse the cooling capacity of the air-cooled condenser. At present, under the high temperature environment in summer, the main technical means to improve the cooling capacity of the air-cooling system is to spray desalted water to assist heat dissipation, which wastes a lot of water resources.

[0005] 2. The heat capacity of air is small, the density is small, and the thermal resistance of convective heat transfer is large, so the radiator area of ​​the air-cooled condenser is large

[0006] 3. Poor wind resistance

When the external ambient wind blows to the air-cooling system, it will press down the hot air flow, which will cause the condenser to dissipate heat and reduce the heat transfer efficiency. Decrease, reduce power generation, and even affect the safety of steam turbines in power plants

In addition, the suction effect of the peripheral fan is prone to hot air recirculation, and the output of the steam turbine is reduced.

In winter, due to the cold air blowing on the condenser tube bundle, the tube bundle will be partially frozen and damaged, resulting in operation accidents

[0007] 4. There are favorable wind directions and unfavorable wind directions in the rectangular layout of the traditional air cooling system, and the difficult-to-control environmental wind direction makes the back pressure of the unit change greatly

[0008] 5. The direct air cooling system adopts the axial flow frequency conversion fan. Although the frequency conversion adjustment can be realized according to the load of the unit and the ambient temperature, the power consumption is still relatively large.

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