Exergoenvironmental analysis of a pulverized coal power plant operating in co-firing process
This paper presents the results of exergoenvironmental analysis of a typical pulverized coal power plant located in southern Brazil.The thermodynamic cycle consists of a pulverized coal boiler,a steam turbine in two stages,without reheating,feeding water heaters and a deaerator with a feeding tank.In this power plant,a co-firing rice straw is proposed,replacing up to 10%of the coal required for the boiler in energy basis.The principal objectives during the study were to determine the environmental impact of the process and assess the exergoenvironmental variables for the system components.The impact carried by the fuels used by the boiler was considered.The exergoenvironmental analysis was performed following a proposed methodology that consists of three steps: exergetic analysis,environmental assessment using LCA(Life Cycle Assessment)and,finally,the environmental impacts transported by the exergy flows through each system component are evaluated by means of exergoenvironmental variables.The environmental impact associated with the route of the fuels(coal and rice straw)were considered.The environmental impact entering to the system with the coal(scenario A,100%coal)was 110 kg CO2-eq per MWh of electricity.For co-firing case(scenario B,90%coal and 10%rice straw in energy basis)the environmental impact entering the fuels was 113 kg CO2-eq per MWh.The exergetic analysis follows the classical approach considering the exergies of the fuel and the product for the system components.An environmental analysis was done for the system components using LCA method,considering climate change impact category and GWP 100a(Global Warming Potential)index according to IPCC(Intergovernmental Panel on Climate Change).The exergoenvironmental analysis showed leaving-the-system total impacts of 16.4 kg CO2-eq/s for scenario A and 12.3 kg CO2-eq/s for the scenario B.For both scenarios,the boiler appears as the main source of impact.The LCA method was adequate to calculate the environmental impact.The exergoenvironmental variables showed a satisfactory behavior taking into account the methodological approach.
Power plant Exergoenvironmental analysis Co-firing Life cycle assessment
(A)lvaro Restrepo Edson Bazzo Marcelo Bzuneck
Technological University of Pereira,Pereira,Colombia Federal University of Santa Catarina,Florianópolis,Brazil Tractebel Energia,Capivari de Baixo,Brazil
国际会议
桂林
英文
1-15
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）