600 MW褐煤对冲锅炉污泥掺烧及NOx排放特性模拟研究OA

Co-firing sludge in coal-fired boilers can help thermal power plants to reduce energy consumption and carbon emissions whilst efficiently treating solid waste.However,the sludge has a high moisture content and a complex composition.These properties affects the combustion and emission characteristics of the boiler when the sludge is co-fired,thereby limiting its co-firing application.ANSYS Fluent was used to simulate combustion in a 600 MW opposed-wall-fired boiler.The study investigated the effects of co-firing sludge on the temperature distribution within the boiler and the NOx emission patterns.The results show that reducing the moisture content of the sludge has a dual effect on combustion.The results indicate that reducing the moisture content of the sludge has a dual effect on combustion.The associated increases in ash and volatile matter fractions can also delay the combustion of char.The sludge injection location has a significant impact on boiler combustion.Feeding sludge evenly into the furnace from each burner can significantly reduce the adverse effects of co-firing on boiler combustion.As the sludge co-firing ratio increases,the furnace temperature decreases and char burnout declines,while NOx emissions are reduced.The sludge should not be dried excessively.A 10％sludge blending ratio uniformly applied at each burner represents a relatively effective co-firing strategy.