Lime kiln combined denitration system

Abstract

The invention relates to a lime kiln combined denitration system. The lime kiln combined denitration system comprises a compressed air storage tank, a reducing agent storage tank, a desalted water storage tank, a denitration agent storage tank and a lime kiln, wherein the lime kiln is provided with reducing agent spraying guns and denitration agent spraying guns; the compressed air storage tank isconnected to compressed air inlets of the reducing agent spraying guns and denitration agent spraying guns through a compressed air main pipe, compressed air secondary pipes and compressed air branched pipes; the reducing agent storage tank is connected to reducing agent inlets of the reducing agent spraying guns through a reducing agent main pipe, a reducing agent secondary pipe and reducing agent branched pipes; the denitration agent storage tank is connected to a static mixer through a denitration pump and a metering instrument; the desalted water storage tank is connected to the static mixer through a desalted water pump and the metering instrument; the static mixer is connected to denitration agent inlets of the denitration agent spraying guns through a denitration agent main pipe, adenitration agent secondary pipe and denitration agent branched pipes. According to the lime kiln combined denitration system, the combined denitration system with combination of denitration by the denitration agent and denitration by the reducing agent is used for denitrating; the selective non-catalytic reduction denitration efficiency of the smoke of the lime kiln is improved.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment of industrial furnaces and kilns, and relates to denitrification equipment, in particular to a lime kiln combined denitrification system. Background technique [0002] Flue gas is the main discharge of the lime kiln, which is a mixed gas produced by the combustion of combustibles in the kiln and the decomposition of limestone. Since the flue gas contains a large amount of nitrogen oxides such as NOx, if these nitrogen oxides are directly discharged into the atmosphere, they will pollute the air, form photochemical smog and acid rain, and endanger human health. Therefore, the flue gas must be denitrified before being discharged ( That is, denitrification) treatment. [0003] At present, there are two main flue gas denitrification technologies: Selective Reduction Reduction (SCR) technology and Selective Non-Catalytic Reduction (SNCR) technology. Selective non-catalytic reduction (SNCR)...

AI Technical Summary

Problems solved by technology

The SNCR denitrification process of the prior art is applied to the circulating fluidized bed boiler, and the denitrification efficiency is between 30-50%. It has not been found that the SNCR denitrification is applied to the field of lime kiln flue gas denitrification, and the existing technology cannot fully meet the requirements of lime kiln flue gas emission. quality requirements

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