Local calcium circulation and pure oxygen combustion coupling carbon capture device and process for cement production

Abstract

The invention discloses a local calcium circulation and pure oxygen combustion coupling carbon capture device and process for cement production, and the device comprises a preheater-carbonization furnace-rotary kiln module, a pure oxygen combustion decomposing furnace module and an auxiliary and purification device. The preheater-carbonization furnace-rotary kiln module comprises a raw material feeding device, a first-series cyclone preheater, a carbonization furnace, a second-series cyclone preheater, a smoke chamber, a rotary kiln, a tertiary air pipe, a rotary kiln combustor and a cooling machine. The pure oxygen combustion decomposing furnace module comprises a decomposing furnace, a decomposing furnace combustor, a third-series cyclone preheater and a booster fan. The auxiliary and purification device comprises a first SNCR (Selective Non Catalytic Reduction) device, a second SNCR device, an air distribution device, a first material distribution device, a second material distribution device, a first heat exchange device, a second heat exchange device, a condensation and water removal device, a CO2 collection and storage device, a dust removal device, an SCR (Selective Catalytic Reduction) device and a flue gas exhaust device. Through modular separation and coupling, the CO2 capture and utilization difficulty is reduced, and good economical efficiency is achieved.

Description

technical field [0001] The invention relates to the cross technical field of cement production and calcium cycle carbon capture, in particular to a cement production carbon capture device and process coupled with local calcium cycle and pure oxygen combustion. Background technique [0002] With the rapid development of the national economy, China's CO 2 Emissions are increasing year by year, reaching 9.43 billion tons in 2017, of which the cement industry is my country's CO2 2 One of the main emission sources (annual emission is about 2 billion tons, accounting for about 21%). Therefore, my country is under great pressure to reduce carbon emissions, and it is particularly important and urgent to reduce carbon emissions in the cement industry. [0003] Carbon emission reduction in the cement industry is mainly achieved through flue gas purification and capture. At present, the main capture processes include: chemical absorption method, membrane separation method, pure oxyge...

AI Technical Summary

Problems solved by technology

Due to the sharp decline in activity and low cycle efficiency during the calcium cycle, and the high cost of achieving a pure oxygen environment for the entire cement kiln system, the promotion and application of pure oxygen combustion and calcium cycle technology in the field of carbon capture from cement kiln flue gas has been hindered.

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