Life Cycle Assessment Of A Renovation Project About Cogeneration Of Steam Heating System In An Economic Zone

With the energy crisis and global environmental issues becoming increasinglyserious, full life cycle analysis called extensive attention of the world. The Tianbaothermoelectric company is located in the Tianjin Airport Economic Area, It undertakesthe construction of heating, cooling, electricity and other energy facilities,energyproduction, operation and management in the economic zone.The first phase of theHeat Plant project using four75t/h medium-temperature and medium-pressurecirculating fluidized bed boiler.Based on the first phase of the project, a renovationproject was built with two units of7MW back pressure steam turbine generator sets,inorder to carry out cogeneration transformation to two75t/h boilors. Phase II projectusing2sets of240t/h high-temperature and high-pressure circulating fluidized bedboilers and2sets of25MW back pressure steam turbine generators.According to the two kinds of life cycle assessment technology frameworkdeveloped by the International Organization for Standardization and the Society ofEnvironmental Toxicology and Chemistry Society, full life cycle analysis is devidedinto four parts: goals and determine the scope, inventory analysis, life cycle impactassessment and interpretation of the results.The object of this paper is the first phaseand its cogeneration transformation of the heat source plant engineering. The secondphase was cited as a comparison reference. Combining with the full life cycleassessment method, we gave three full life cycle boundary of the project, calculatedexergy output value of steam forthermal systems and cogeneration systems. in orderto get a unified output dimensionless for the steam heating systems and cogenerationsystems, we selected GJ as a function of the system unit.Then we established a list of the full life cycle of three projects by collecting andcalculating its basic data, including the construction, operation and decommissioningof the three stages. Based on the establishment of energy consumption, resourceconsumption, environmental emissions inventory, in order to conduct acomprehensive calculation and analysis on the three projects, we extended life cycleimpact assessment to the evaluation of the life cycle energy consumption,evaluationof life cycle resource consumption, environmental impact assessment of the life cycle,life cycle cost evaluation.Finally, based on the calculation results of energy consumption, resourceconsumption, full life-cycle environmental impact value, the full life cycle costs, we performed a more comprehensive analysis and evaluation on the three projects. Wecan get conclutions by contrast as following:the cogeneration transformation weperformed in the first phase made it has a higher energy efficiency, lower coalconsumption and lower production costs. Then we can effectively reduce theproduction costs of enterprises, improve the economic efficiency of enterprises by thismeans, so as to enhance the enterprises’market competitiveness.