Selective non-catalytic reduction SNCR DeNOx technology (Selective Non-Catalytic Reduction) is a low-cost denitration technology. The technology in the reactor furnace, the reducing agent (commonly used in the industry is ammonia or urea solution) is sprayed into the furnace temperature range of 900 ~ 1100 ℃, in the flue gas reacts with the NOx, form nitrogen and water, so as to remove the smoke the purpose of the NOx gas.