Method for producing partial full-oxygen type cement suitable for separation and collection of CO2

Abstract

The invention discloses a method for producing partial full-oxygen type cement suitable for separation and collection of CO2, which is a cement production process combining a process of pre-decomposing cement raw materials by using full-oxygen combustion and a process of baking clinkers by using conventional heated air combustion and can effectively solve the problems of the separation and collection of the CO2 in the cement production process. The raw materials subjected to the decomposition of carbonate in a decomposing furnace are separated through a fifth-stage cyclone and enter a rotary kiln, and the combustion way of the rotary kiln is different from the conventional way; the other part of heated air is discharged by a grate cooler to serve as secondary air for combustion, wherein the temperature of the firing zone in the kiln reaches 1,800 DEG C; the heat from fuel combustion is transmitted to materials; the materials are calcined into clinkers; the clinkers from the rotary kiln enter the grate cooler and then enter a rear material receiving device after being cooled; smoke from the rotary kiln enters a right five-stage preheater and is mixed with the heated air from the grate cooler at the output of the five-stage preheater; and the mixed air enters a fourth-stage preheater, gradually rises and is discharged from the top of a first-stage preheater to an exhaust gas processing system.

Description

technical field [0001] The invention relates to a partially all-oxygen cement production method, that is, a cement production process that combines pre-decomposition of cement raw meal by full-oxygen combustion and clinker firing by conventional hot air combustion, and belongs to the technical field of cement production. Background technique [0002] One ton of CO is emitted for every ton of cement clinker produced 2 In 2007, the total output of cement in my country was about 1.36 billion tons (clinker was about 700 million tons), and the CO emitted into the atmosphere 2 About 700 million tons, accounting for about 10% of the country's total emissions. my country is one of the contracting parties of the "Kyoto Protocol", and after 2012 it will face the reduction of CO emissions 2 task, so how to reduce or capture the huge amount of CO emitted in cement production 2 It has become one of the severe tests faced by the cement industry. [0003] Separation and recovery of CO ...

AI Technical Summary

Problems solved by technology

[0005] Technical problem: the present invention is aimed at the exhaust CO that exists in the current cement process 2 Low concentration, difficult to achieve CO 2 For the problem of separation and capture, a set of methods suitable for separation and capture of CO is proposed 2 The partial oxygen-based cement production method can obtain most of the CO with a concentration of more than 95% in the cement production process 2 , to facilitate the collection of CO 2 for compression, delivery and storage

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