Cement co-production technology based on lime mud

Abstract

The invention discloses a cement co-production technology based on lime mud. The cement co-production technology comprises the following steps: carrying out electromagnetic iron removal on the lime mud, then carrying out cyclic trapping of CO2 after residual temperature drying by using waste gas in a cement plant so as to obtain high-purity CO2 and seal up the obtained high-purity CO2 for storage; discharging the lime mud through a discharging pump after a certain number of times of cycle, feeding to a raw meal homogenizing silo of a cement technology, and matching with other raw materials to obtain a cement raw material; and carrying out high-temperature preheating, predecomposition, rotary kiln calcinations, grate cooler cooling and grinding on the cement raw material so as to obtain cement, wherein the water content of the lime mud is not higher than 12%, and SO2 of the waste gas is firstly removed through a desulfurizing tower before the dry lime mud is dried. The technology disclosed by the invention solves the problems such as occupation of lime mud stacking for land resources and environmental pollution, and meanwhile the carbon emission of the cement plant is reduced.

Description

technical field [0001] The invention belongs to the technical field of cement co-production technology, and in particular relates to a cement co-production technology based on lime slag. Background technique [0002] Currently, the world's annual CO emissions into the atmosphere 2 There are more than 30 billion tons, of which about 22% come from cement plants, steel plants and oil refineries. To reduce CO 2 emissions, CO 2 processed by capture. [0003] About CO 2 Capture, currently there are pre-combustion capture, post-combustion capture, and oxygen-enriched combustion. Among them, pre-combustion capture technology is mainly integrated gasification combined cycle (IGCC) technology; post-combustion capture mainly includes ethanolamine (MEA) adsorption method and calcium cycle (CLP) adsorption method, and ethanolamine adsorption method is only suitable for low temperature (65°C) The decarbonization cycle has low energy efficiency. The calcium cycle adsorption method us...

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Problems solved by technology

Among them, pre-combustion capture technology is mainly integrated gasification combined cycle (IGCC) technology; post-combustion capture mainly includes ethanolamine (MEA) adsorption method and calcium cycle (CLP) adsorption method, and ethanolamine adsorption method is only suitable for low temperature (65°C) The decarbonization cycle has low energy efficiency. The calcium cycle adsorption method usually uses natural limestone as the adsorbent, which is suitable for high-temperature cycle adsorption. The oxygen-enriched combustion technology is also widely used, but the oxygen-enriched combustion requires an air separation unit, which consumes a lot of energy. Carbon capture is expensive