Evaluation Research And Application On Air Cooling System Of Thermal Power Plant

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. 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. Nowadays65%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 only1/6of conventional moist-chilling units. Therefore, direct air-cooling technology has been widely used in modern thermal power now.This study based on the actual conditions and the local meteorological conditions of the TLT and HBW thermal power plan. With the purpose of optimization calculation, the economic and technical of direct air cooling and indirect air cooling were analyzed. According to the different parameters of the steam condenser cooling area and the prevailing wind direction wind speed of the air-cooled unit of each scheme, the summer capacity and economy were analyzed to seek the best cooling schemes for the thermal power plan. Did the further optimization design, reduce the consumption indicators. In the condition of safety engineering operation and optimal technology economy, do as much as possible of the water reuse. Also consider the feasibility of using the air cooling turbine with significantly water-saving effect.The results of the study showed that the direct air-cooling system performed better than the surface type indirect air-cooled system with the following advantages:simple system, cover less area, plant layout is compact, multi-anti-freeze methods, easy and safe operation in winter. From the analysis of current market price, the initial investment of direct air-cooling system is lower than surface type indirect air-cooled system. Two system basically have the same overall economic efficiency. So the DLT power plant project is recommended for the direct air-cooling system.For the TBW power plant project, the surface condensing indirect air-cooled system is better than direct air-cooling system. But through the comprehensive comparison of the technical scheme, investment and economic benefit between the surface condensing indirect air-cooled system and the general cold system, we found the air cooling units had high investment and coal consumption besides the running economy was bad. The price and income of the air cooling units were not competitive; it only showed the outstanding advantage of water-saving. Under the prerequisite of not take in new water, the running economy of general cold unit still better than the air cooling unit. So the HBW power plant project uses the general cold units, and implement deep treatment of wastewater reuse in the project.