Performance Study Of CCHP System Based On Life Cycle Assessment

There are many advantages in CCHP system,for instance,the multi-level utilization of energy,proximity to users and the stability of energy supply and so on.It has obtained the economic and policy support by Chinese government,and has strongly promoted it to enter a period of rapid and vigorous development.However,there are few studies on the resource input and pollutant emissions in the construction system,production and disposal,etc.,so this paper chooses the life cycle assessment(LCA)method to study the above problems.LCA is a theoretical tool to evaluate the energy and resource use and pollutant emissions of products in each stage.At the same time,it can also put forward suggestions for the over-use of resources and serious pollution emissions.The main content of this paper is based on the LCA,taking the CCHP system engineering of an ecological office group in Tianjin as an example to establish the life cycle analysis model of gas unit plate,ground source heat pump plate and fuel plate.First of all,the research boundaries of different plates are determined according to the goal and research scope,in which the gas unit plate and the ground source heat pump unit plate mainly consider five stages: resource exploitation,manufacturing preparation,finished product transportation,operation management and recovery and reuse.While the fuel plate mainly analyzes three stages: resource exploitation,finished product transportation and operation management.The second is to collect the energy consumption of each plate in different stages,such as electric energy and natural gas,as well as the corresponding harmful pollutant gas emission information,and classify,standardize and weight the resources,energy input and harmful pollutant emissions according to the type.Finally,the resource consumption coefficient and the environmental pollutant emission coefficient are used to evaluate the consumption degree of different kinds of resources and energy and the severity of harmful pollutants to the environment.At the end of this paper,the research results of fuel plate are compared with the resource consumption coefficient and environmental pollutant emission coefficient of coal mining,transportation and power generation involved in thermal power generation.The results show that thermal power generation has more energy input and harmful pollutants such as coal and natural gas,but less investment in mineral resources such as dolomite and limestone.The first innovation of this paper is to use the life cycle assessment method to analyze the resources,energy consumption and pollutant emissions involved in the CCHP system;The second is to compare with the traditional thermal power generation.