Method and equipment for producing cement and gathering CO2 by utilizing closed ring-shaped calcination furnace

Abstract

The invention discloses a method and equipment for producing cement and gathering CO2 by utilizing a closed ring-shaped calcination furnace. The equipment comprises a raw material crusher, a material screening machine, a material homogenizing cabin, a material flour mill, a material metering device and a closed ring-shaped calcination furnace which are connected with one another sequentially, wherein the closed ring-shaped calcination furnace is connected with a CO2 gathering mechanism and a grate cooler respectively; the grate cooler is connected with a clinker storage warehouse and a clinker metering device respectively; the clinker metering device and a blending material preparing mechanism are connected with a cement grinding mill respectively; and the cement grinding mill is connected with a cement storage warehouse. The method comprises the following steps: raw material preprocessing, raw material preparing, clinker calcinating, discharging, carbon gathering, mixed material preparing and cement manufacturing process. The equipment provided by the invention has a compact structure, low investment intensity and a low operation cost, and is easy to maintain. The technological conditions for realizing the production of cement and the gathering of CO2 are mature, and the procedures are simple, so that CO2 generated in the cement producing process can be gathered effectively.

Description

technical field [0001] The invention relates to a method and equipment for producing cement, in particular to a method and equipment for producing cement by using a closed annular calciner and realizing carbon dioxide capture. Background technique [0002] Cement, powdery inorganic cementitious material, is a building material that can harden in water and air and can firmly bind sand, stone and other materials together. It has been widely used in civil engineering, water conservancy , national defense and other projects are the basic raw materials of the national economy. Cement is a typical resource and energy-consuming product. Its production process mainly includes three stages: raw meal preparation, clinker calcination, and cement production. It needs to consume a large amount of resources and energy such as limestone raw materials, coal, and electricity. emissions of carbon dioxide (CO 2 ) of large households. [0003] Compared with other industrial sectors such as e...

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Problems solved by technology

[0005] Based on the current production and research status of cement, there is no one that can effectively solve the CO2 in the cement industry. 2 Production process with high emissions problem

It is not difficult to find that in the cement production process, the decomposition of carbonate and the combustion of fuel during clinker calcination are CO 2 The main reason for the huge amount of emissions, but because in the existing process, the clinker calcination process is an open environment, the CO produced by the decomposition of carbonate 2 Mixed with exhaust gas from fuel combustion and N in the air 2 composition, so that the CO discharged from the kiln tail 2 The concentration is low, only about 15%, which gives subsequent CO 2 The separation and recovery of the separation brings great difficulties and high cost

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