Cold DeNOx development for oxyfuel power plants

Flue gas purification is a necessary method to avoid emission of sour gases like SO(x) and NO(x) into the environment. Another important aspect is the zero CO(2) emission from coal-fired power plants. Oxyfuel technology is one of the processes to reach this goal. LINDE KCA Dresden in cooperation with Vattenfall Europe is operating a pilot plant producing liquefied CO(2). Product specification and material requirements make flue gas purification for the removal of SO(x) and NO(x) unavoidable. The new oxyfuel technologies offer new process conditions for flue gas purification which are not available at atmospheric conditions. At Linde laboratories, catalytic and non-catalytic DeNOx and DeSOx processes have been screened for oxyfuel application. After first feasibility studies, laboratory experiments and economic evaluations, it was decided to develop a process based on wet scrubber systems to remove NO(x) from flue gas, simultaneously producing ammonia nitrites which can be thermally decomposed into nitrogen in a second step. After demonstration of the single process steps on laboratory scale, a pilot scrubber was erected and commissioned in 2010 at Schwarze Pumpe Oxyfuel Pilot Plant. In September 2010, the successful completion of the pilot tests demonstrated the NO(x) removal efficiency of this technology. The data from the pilot plant tests have been used to finalise a kinetic model describing the NO(x) absorption behaviour regarding NO(x) removal rate and nitrite selectivity for demonstration of plant scale up. This DeNOx-process is now marketed under the name LICONOX. (C) 2011 Elsevier Ltd. All rights reserved.