The Cold Simulated Experimental Study on NOx Reduction in Pulverized Coal Boiler Using Natural Gas Reburning Technology

摘要

A cold model (its ratio is 1:12.5) of a 50 MW tangential pulverized coal-fired boiler was built and the mixture characteristic among simulating gas (hot air), OFA (overfire air, cold air) and main airflow (cold air) were gotten at different ejecting methods and quantities of the simulating gas through measuring the temperature pattern distributing in the furnace of the model. The test results showed: the method of the simulating gas spouted from front and rear walls resulted an even mixture characteristic, but the tangentially ejected simulating gas was more suitable for the tangential pulverized coal-fired boiler, and the tangential OFA is better for burnout. The effects of quantities and locations of the simulating gas and OFA on the mixture characteristic were also discussed in the paper.