| Energy shortage is becoming more and more serious and will restrict the human's society development. How to keep the thermal generator set at the economist operating condition so that the energy could be fully used of is the society's common aim. The cold-end system is an important composition for the whole power plant's design, arrangement, installation, operating and maintenance, so keep its working at optimum operating piont has great significance to the economical efficiency improvement of the whole unit.In this article, the property and relatedness of the last stage of steam turbine, water circulating pump and the cooling tower has been studied, and combined with the trial curve of condenser's heat load, unit's heat consumption rate and pipeline's characteristic performance, the energy loss analysis calculation model of cold end has been established,whose objective function is the unit's net power and optimum profit. What's more, in allusion to the circulation pump system with variable vane whose adjust ability is higher in circulating water system, an online guide system is developed of cold-end optimization and control, which has been proved by the operation that it can help the operator adjust the unit's operation to keep it at the best condition.In allusion to the constant-speed circulation pump with low adjust ability in circulating water system, a project to enlarge the circulating flow adjustable range by changing its velocity has been researched, and feasibility study has also been made in terms of safety and economy. Study shows that the cold-end has certain energy-saving potential, and can the transformation can attain ideal energy-saving effect. |
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