| The way using the energy contained in fossil fuels such as coal, oil and natural gas to generate electricity is collectively referred to as thermal power。According to different fuel prime and mover, thermal power is divided into coal-fired turbine, fuel turbine, combined gas-steam cycle and diesel generating electricity. At present, thermal generating electricity is still the main mode of modern power and accounts higher percentages although there are such generation modes as nuclear power, wind power in China in recent years. In the past several years, in order to solve the problem that power supply can not meet the needs of economic development, many thermal power plants were built across the country. Thermal power consumes water resource and non-renewable energy, and has adverse effects on the environment. To meet the requirements for economic sustainable development and establishing a harmonious society, thermal power technology should focus on efficient utilization of water resources and non-renewable energy, and on the environmental impact.The construction of thermal power plants must have basic conditions, both fuel and abundant water resources, but it is often difficult to meet these conditions meanwhile. Usually, the fuel-rich regions are often lack of water seriously and the water-rich regions are often lack of fuel. China is a national shortage of water resources, the space-time distribution water resources is uneven. Nowadays 65% cities are short of water, 12% cites are in severe water shortages in China. The coal bases that can be used to generate electricity are mostly concentrated in the dry areas, the so-called coal-rich and water shortage. The water resources in rich coal area cannot satisfy the requirement for water to generate thermal power, which seriously restrict the development of thermal power generation. Developing air cooling units can greatly reduce the water use index, and their water consumption is only 1/6 of conventional moist-chilling units. Therefore, direct air-cooling technology has been widely used in modern thermal power now.Adopting direct air-cooling technology requires that system during operation keeps vacuum degree. From the running of the direct air-cooled units go into operation in China, the lack of tightness of the vacuum system is a widespread problem. Air-cooled units has large volume vacuum ,more welded junctions ,which is likely to cause large vacuum system leaks, thus affecting the vacuum system tightness of air cooling units, resulting in the higher of operating back-pressure high of units, the increase of coal consumption, the reduce of carrying load capacity. Therefore, in order to ensure the installation quality of direct air-cooling project, to guarantee system vacuum degree into operation, the construction quality control of air cooling project need to be strengthened.In this paper, taking the Direct Air-cooling Project of Datang Jingtai Power Plant for a case, combing electric construction characteristic, based on the project quality management theory, according to electric power construction features, the steps of quality planning and quality planning implementation were studied systematically ,the characteristics of quality control, principles and control process were analyzed, and how to control the main factors including people, machines, materials, method and environment which affect the construction quality was analyzed. According to the methods of quality control proposed in this paper, Jingtai's direct air-cooling project passed the test of system vacuum leakproofness one time. After completion of the project implementation, according to actual management process and achievements, the quality management system document has been revised, which further improved the system's effectiveness and suitability, laid solid foundation for promoting further improving air-cooling engineering quality management level.
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