Integrated Evaluation Of Cooling Technology For Large Hydro Generators Based On Lifecycle Perspective

Hydro-electricity is considered to be the most important renewable clean energy.To give priority to its development and utilization is not only an international consensus,but also an important direction to the development of domestic renewable energy and energy structure adjustment.Cooling technology plays a key role in the hydro-electricity's service life,generating efficiency,and long-time steady running.Due to the trend of large-scale development of present hydro-generator,large hydro-generator cooling technology is increasingly needed.It is of great importance and significance to build up a complete evaluation system to analyze and evaluate the three common cooling technologies----fully air cooling,semi-water cooling,and evaporation cooling from three aspects: cost,environmental influences,and energy consumption.Life cycle theory is regarded as one of the most important tools to analyze development process of the object studied,which defined the process into four stages: start,growth,maturity,and recession.Simply based on life cycle assessment(LCA),the traditional studies can't cover all the three aspects.However,aiming to build a single integrated methodology and comprehensive reflection of the environmental and economic performance of a product or process,LCA is combined with life cycle cost analysis(LCC)in this paper,which will help to provide a scientific basis for businesses and governments to make efficient decisions.The main works and innovations are as follows:(1)Analyzed about 11742 papers related by bibliometric method to explore the hotpot and trend of cooling technology through the recent 22 years.(2)Built policy-analysis method that based on technology life cycle theory and technology evolution theory.Started from patent analyses combined with technology life cycle theory,TRIZ theory,and S-curve predictive theory to form a quantitative analysis system for technology policy analysis,and found the equation for the S-curve.With the equation we could draw a conclusion: semi-water cooling has already achieved its mature period,fully air cooling will achieve in 2030,and evaporation cooling 2050.(3)Built an integrated evaluation system based on LCA/LCC,and applied it to Lijiaxia 400 MW fully air cooling and evaporation cooling hydro-generator.The results showed that the carbon dioxide emission of evaporation cooling unit is 47.08% less than the fully air cooling one.The final evaluation of evaporation cooling unit is 99.2 points,and the fully air cooling unit 70.2 points.