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Research on Affecting of Ambient Wind to Heat Transfer of Direct Air-Cooled Condenser

Author: LiuDa
Tutor: YangJianGuo
School: Harbin Institute of Technology
Course: Thermal Power Engineering
Keywords: Direct Air Cooled Condenser Transverse wind Furnace Later Wind Horizontal flap Windbreak Windproof guided drift
CLC: TM621
Type: Master's thesis
Year: 2011
Downloads: 96
Quote: 0
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Abstract


Severe shortage of water resources in northern China, pithead power plant area, especially in the dry season, it is difficult to assume a large flow of water, a direct impact on whether the plant's problems. Direct Air technology, because of its outstanding water-saving features, it is possible to solve the bottleneck problem of water resources, has been widely used. But the effect of heat transfer of direct air-cooled condenser is highly vulnerable to external environment factors, especially the environmental wind will cause deterioration of Direct Air Cooled Condenser heat transfer effect, direct air-cooled turbine back pressure, affect the safety of the direct air cooling unit, The economy is running. The environmental impact of the wind of direct air cooling system is to study one of the urgent problems of the air-cooled technology. The environmental wind affect direct air-cooled condenser heat exchanger studied in this paper for the the dominant horizontal wind, and the furnace after the wind. Domestic Ningxia Power Plant 1000MW Direct Air Cooled Condenser prototype, the establishment of direct air cooling unit and a mathematical model of the direct air-cooled island, to study the impact of direct air-cooled condenser heat exchanger law of horizontal wind; Equipped level baffle windbreak, deflector, guide INFOCAP, measures to improve the fan air flow into the numerical simulation; furnace wind affects the amount of wind and heat transfer analysis of the effects of the air-cooled island. The study showed that: the reduction of the mass flow, swirl phenomenon, the phenomenon of hot air recirculation, intrusion phenomenon is the main factors of the horizontal wind flow and heat transfer affect the Direct Air Cooled Condenser; horizontal baffle retrofit measures horizontal wind negative pressure zone of the windward side of the direct air-cooled unit fan inlet forward to improve the operating environment of the wind turbine; whole windbreak environmental wind above by air-cooled platform, reducing the air-cooled island the peripheral air cooling unit fan inlet velocity to increase fan pressure, negative pressure zone at the entrance to increase air flow into the air-cooled unit, and at the same time increasing the air flow into the air cooled condenser peripheral fan, to avoid an adverse impact on the air-cooled island internal fan; the proposed wind guide drift overcome diversion block the defect of the board, integrated the advantages of both baffle and windbreak, is precautions an ideal; hot air recirculation and air-cooled Island fan inlet air volume reduction furnace after wind deterioration of direct air cooling system heat exchanger The effect of two important factors, install full windbreak net is an effective measures to improve the fan air flow into the Direct Air Island wind wall along.

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CLC: > Industrial Technology > Electrotechnical > Power generation, power plants > Power plant > Thermal power plants, thermal power stations
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