Low Nitrogen Modification and Operation Optimization of 600 MW Subcritical Boiler Burner
The 600 MW subcritical boiler of a power plant was optimized for low nitrogen burner,and after the transformation of the 61#furnace burner,the following effects were achieved under the premise of burning actual coal:the high temperature corrosion phenomenon of the water wall was significantly improved;Improve the overtemperature phenomenon of screen superheater,and reduce the amount of temperature reduction by more than 10%;eliminates burner spouts and surrounding water wall coking.The debugging experiment of the milling system shows that 6 coal mills can be operated at the same time at 600 MW load,and the maximum output of each mill is 60 t/h.With a load of 500 MW,5 coal mills can be operated simultaneously under the existing coal quality.The on-site sampling results after the transformation of the combustion system showed that the carbon content of the slag was 3.06%,and the carbon content of fly ash was 5.37%,both of which decreased by more than 10%,and under the premise of the same coal quality conditions,the NOx mass concentration at the boiler outlet decreased from the original 600-700 mg/m3 to 300-350 mg/m3,which effectively reduced the cost of the denitration device and achieved the purpose of energy conservation and environmental protection,when coal blending is burned,when the blending ratio of Xinjiang coal and local coal is greater than 1∶1,it can effectively prevent coking.So the transformation has good promotion and application value.
combustion system optimizationenergy conservationmilling systemNOx