Desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials

Abstract

The invention discloses a desulfurization, denitrification and dust removal ultralow emission process and system for production of cement from low-sulfur raw materials. The process comprises the stepsas follows: firing of cement clinker, dust removal, flue gas blending, low-temperature SCR denitrification and wet desulfurization. The system comprises a cement clinker firing system, a kiln tail high-temperature fan, a grinding system, a kiln tail dust collector, a low-temperature SCR denitrification reactor, a wet desulfurization tower, a kiln head dust collector and a kiln head induced draftfan; a kiln tail preheater C1 gas outlet, the kiln tail high-temperature fan, the grinding system, the kiln tail dust collector, the low-temperature SCR denitrification reactor, the wet desulfurization tower, an exhaust fan and a kiln tail chimney are sequentially arranged; a cooler, a kiln head dust collector and the kiln head induced draft fan are sequentially connected; an outlet of the kiln head induced draft fan is connected with a gas outlet of the kiln tail dust collector. Dry desulfurization, SCR and wet desulfurization processes are adopted for production of cement from the low-sulfurraw materials, and desulfurization and denitrification ultralow emission during production of the cement from the low-sulfur raw materials is realized.

Description

Technical field

[0001] The invention relates to the technical field of flue gas treatment, in particular to an ultra-low emission process and system for desulfurization, denitrification and dust removal for producing cement from low-sulfur raw materials. Background technique

[0002] The national environmental protection policy is becoming more and more stringent. The national standard GB4915-2013 "Cement Industry Air Pollutant Emission Standard" sets special restrictions on the emission of air pollutants from cement kilns and waste heat utilization systems in key areas as NO x 320mg / Nm 3 , SO 2 100mg / Nm 3 , Particulate matter 20mg / Nm 3 . The second generation cement technical standard released by the Building Materials Association requires NO x Emission is 100mg / Nm 3 , SO 2 Emission is 50mg / Nm 3 , Dust emission is 10mg / Nm 3 . Recently, some local governments have introduced stricter policies to limit unit emissions and total emissions NO x Emission is 50mg / Nm 3 , SO 2 Emission i...

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