Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology

A technology of cement clinker and combustion technology, which is applied in the field of cement clinker production process using O2/CO2 combustion technology to enrich CO2, which can solve the problems of large capture system, large energy consumption, and large volume, and achieve enhanced heat transfer , increase the radiation capacity, and promote the uniform temperature of the whole furnace

Active Publication Date: 2013-08-21
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the pressure of the flue gas is small, the volume is large, and the CO 2 The concentration is low and contains a lot of N 2 , so the capture system is huge and consumes a lot of energy

Method used

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  • Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology
  • Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology
  • Cement clinker production technology for enriching CO2 by use of O2/CO2 combustion technology

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Experimental program
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Effect test

Embodiment 1

[0027] Such as figure 2As shown, the raw meal entering the raw meal mill with a humidity of about 8% is heat-exchanged with the kiln tail gas at the outlet of the waste heat boiler. After the heat exchange, the raw meal is dried to a humidity of about 1%, and the temperature rises to 90-110°C , to homogenize the raw meal; the raw meal is transported to the five-stage cyclone preheater through the elevator, and the raw meal can be preheated to 700-800°C; the preheated raw meal powder is pre-decomposed in the calciner , into clinker at 850-950°C, which enters the rotary kiln through the feeding pipe, and then undergoes high-temperature forging in the rotary kiln to produce clinker at a temperature of 1200-1300°C, and then falls to the grate cooler through the rotary kiln mouth for cooling , Cool the clinker to about 90-100°C. The temperature of the flue gas at the kiln tail from the five-stage cyclone preheater is about 300-400°C. The exhaust gas waste heat power generation is...

Embodiment 2

[0031] The Egyptian raw meal was tested with a German Naisch STA409PC thermogravimetric analyzer. The initial temperature was 40°C, the end temperature was 1000°C, the heating rate was 20°C / min, and the mass of the raw meal was 10mg. Experiments show that (such as image 3 and Table 1): In the air atmosphere, the raw meal begins to decompose at 755°C, the decomposition rate reaches the maximum at 810°C, and ends at 831°C, the decomposition time is 3.8min, and the decomposition rate reaches 33.14%; when O 2 / CO 2 When the concentration is 40 / 60, the raw meal begins to decompose at 895°C, the decomposition rate reaches the maximum at 918°C, and ends at 941°C, the decomposition time is 2.3min, and the decomposition rate reaches 33.74%. 2 / CO 2 When the concentration is 30 / 70, the raw meal starts to decompose at 912°C, the decomposition rate reaches the maximum at 928°C, and ends at 954°C. The decomposition time is 2.1min, and the decomposition rate reaches 32.37%. 2 / CO 2 Whe...

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Abstract

The invention discloses a cement clinker production technology for enriching CO2 by use of an O2/CO2 combustion technology, belonging to the field of cement clinker production technology. In the cement clinker production technology, O2 separated from the air is mixed with a high-concentration CO2 circulating flue gas, and then the mixture is introduced into a decomposing furnace and a rotary kiln to realize O2/CO2 combustion; the kiln-tail flue gas after the coal powder combustion and clinker decomposition in the decomposing furnace and the rotary kiln is rich in CO2, and the concentration of CO2 in the kiln-tail flue gas exceeds 95%; after flue gas treatment, the concentration of CO2 in the kiln-tail flue gas exceeds 99%; the kiln-tail flue gas can be stored and recycled so as to realize enrichment and recovery of CO2 in a cement production process; and meanwhile, the reduction of CO2 emission is realized in the cement production technology.

Description

technical field [0001] The invention relates to a new cement clinker production process, in particular to a 2 / CO 2 Combustion technology enriches CO 2 cement clinker production process. Background technique [0002] In the context of global warming, countries have proposed CO 2 The development of low-carbon technologies and low-carbon products has attracted widespread attention at home and abroad. As an energy- and resource-intensive industry, the cement industry has become the second largest CO in industrial production after thermal power generation. 2 emission sources, to achieve CO2 in the cement industry 2 The emission reduction is an unavoidable strategic task. Under the current technical level, the CO emitted per ton of cement produced 2 The amount is about 0.7-1.1 tons, nearly half of which comes from the decomposition of carbonate in raw materials (mainly CaCO 3 , MgCO 3 etc.), the other half comes from the combustion of pulverized coal. CO emissions from ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/44
Inventor 陆继东黄秋雄谢新华姚顺春卢志民
Owner SOUTH CHINA UNIV OF TECH
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