Cost analysis of NOx control alternatives for stationary gas turbines

摘要

The use of stationary gas turbines for power generation has been growing rapidly211u001ewith continuing trends predicted well into the future. Factors that are 211u001econtributing to this growth include advances in turbine technology, operating and 211u001esiting flexibility and low capital cost. Restructuring of the electric utility 211u001eindustry will provide new opportunities for on-site generation. In a competitive 211u001emarket, it maybe more cost effective to install small distributed generation 211u001eunits (like gas turbines) within the grid rather than constructing large power 211u001eplants in remote locations with extensive transmission and distribution systems. 211u001eFor the customer, on-site generation will provide added reliability and leverage 211u001eover the cost of purchased power One of the key issues that is addressed in 211u001evirtually every gas turbine application is emissions, particularly NO(sub x) 211u001eemissions. Decades of research and development have significantly reduced the 211u001eNO(sub x) levels emitted from gas turbines from uncontrolled levels. Emission 211u001econtrol technologies are continuing to evolve with older technologies being 211u001egradually phased-out while new technologies are being developed and 211u001ecommercialized. The objective of this study is to determine and compare the cost 211u001eof NO(sub x) control technologies for three size ranges of stationary gas 211u001eturbines: 5 MW, 25 MW and 150 MW. The purpose of the comparison is to evaluate 211u001ethe cost effectiveness and impact of each control technology as a function of 211u001eturbine size. The NO(sub x) control technologies evaluated in this study include: 211u001eLean premix combustion, also known as dry low NO(sub x) (DLN) combustion; 211u001eCatalytic combustion; Water/steam injection; Selective catalytic reduction (SCR)--211u001elow temperature, conventional, high temperature; and SCONO(sub x)(trademark).