Evaluation of Water Injection Impacts for Gas Turbine NOx Control at Compressor Stations. Topical Report June-September 1989

摘要

Acurex reviewed and analyzed data on operational impacts of water injection to control NOx emissions from gas turbines used in gas compression service and developed cost estimates. At a water/fuel (W/F) ratio of 1.0, weight basis, NOx from gas turbines can be reduced by as much as 70 to 80 percent. The performance is accompanied by a thermal efficiency loss of 2 to 3 percent and an increase in CO and hydrocarbon emissions. Although water injection is a mature technology that has been in use for about 15 years on numerous utility and cogeneration installations, operational experience and cost data for application on gas transmission engines are lacking. Costs published to date for water injection have not sufficiently addressed the incremental cost of increased turbine maintenance. Additionally, the cost to secure large quantities of water at remote locations, where many existing compressor station turbines operate, can significantly impact the economics of retrofit project. The life-cycle costs for such retrofit were estimated in the $8,000 to $12,000 per ton of NOx removed, influenced by site-specific factors such as water availability and quality, size of engine, degree of NOx control, and increased maintenance.