System, technology and method for de-nitrating flue gas of cement kiln and recovering waste heat of flue gas of cement kiln

Abstract

The invention discloses a system, technology and method for de-nitrating flue gas of a cement kiln and recovering the waste heat of flue gas of a cement kiln. The system comprises a preheater, a wasteheat boiler, a highly hot air blower, a high temperature bag deduster, an SCR denitration reactor, a raw mill, a kiln tail deduster, an induced draft fan, a heat exchanger, and a chimney. A flue gasoutlet in the tail part of a rotary cement kiln is communicated with an inlet in the lower part of the preheater through a pipeline. The outlet in the top of the preheater is communicated with the inlet in the top of the waste heat boiler through a pipeline. The outlet in the lower part of the waste heat boiler is communicated with the inlet of the high temperature bag deduster through a pipeline.The outlet of the high temperature bag deduster is communicated with the inlet of the SCR denitration reactor through a pipeline. The outlet in the bottom of the SCR denitration reactor is communicated with the inlet of the raw mill through a pipeline. The outlet of the raw mill is communicated with the inlet of the kiln tail deduster through a pipeline. The ultralow temperature waste heat utilization and ultralow pollutant discharge are effectively co-researched. The content of NOx in flue gas of a cement kiln is efficiently reduced, the energy consumption is low, and finally discharged fluegas meets the discharge requirements.

Description

technical field [0001] The invention relates to the technical field of air pollutant treatment, in particular to a system and a process method for cement kiln tail flue gas denitrification and waste heat recovery. Background technique [0002] Cement industry NO x The total amount of emissions ranks second in industrial emissions, second only to the power industry. With ultra-low transformation of electricity and steel already implemented, it is the general trend to achieve ultra-low emissions of pollutants in the cement industry. The national emission standards for pollutants in the cement industry are also becoming increasingly stringent. [0003] The emission reduction efficiency of the low-nitrogen combustion, staged combustion and SNCR technologies that have been applied in the cement industry is difficult to meet the increasingly stringent standards. Therefore, it is imperative to promote the nitrogen oxide control technology in the cement industry. [0004] Adopting...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a system and process for cement kiln tail flue gas denitrification and waste heat recovery, to solve the problem of complicated ultra-low emission control process of nitrogen oxides in the whole process of cement kiln flue gas, low denitrification efficiency, and large energy consumption And the waste heat cannot be used, the catalyst is easy to block the pores and other technical problems

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