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Study on Influence of Typical Alkali and Alkaline Metals to Coke Reactivity with CO2

Author: WangXiaoLei
Tutor: GuoZhi；QuSiJian
School: CCRI
Course: Chemical processes
Keywords: Alkali metal Alkaline earth metals Coke reactivity Catalysis
CLC: TQ520.1
Type: Master's thesis
Year: 2008
Downloads: 142
Quote: 3
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Abstract


The hot coke reactive can better reflect its ability to resist chemical attack in a blast furnace , is an important indicator of the evaluation of the quality of coke . This paper studies typical alkali metal , alkaline earth metal of different metamorphic grade coal tar - CO 2 reaction , as well as the same kind of coal the different densities grade enrichment coke -CO 2 reaction the nature of the catalytic effect relationship for the purpose of by adding K the 2 CO 3 Na 2 CO 3 , CaCO < sub> 3 and MgO to the coking in the coal (or enrichment ) for each density level , the alkali metal , alkaline earth metal solution loss of coke catalytic kinetics of the reaction , the solution loss reaction of the coke reasons discussed , too alkali the catalysis relationship of different coal and rock . The results show that : adding an alkali metal , alkaline earth metal , the impact of the reactive gas coal coke is smaller than the impact on coking coal coke . The same kind of alkali metal , alkaline earth metal with the increase of the added amount , the greater the conversion rate of coke . With the solution loss reaction time increases , the the coke conversion rate gradually increase . Other conditions are the same , add K 2 < / sub> CO 3 coke conversion rate , followed by Na 2 CO 3 < / sub>, CaCO 3 and MgO. For coking coal is concerned , the alkali after vitrinite corresponding coke microstructure reactivity . Its low alkali content of coke , adding alkali solution loss reaction in CO 2 conversion rate of increase is greater than its high alkali content of the coke . Kinetic studies showed that , the for gas coal coke , the alkali catalyst is to lower the activation energy of the reaction . Coking coal coke add 0.5% Na 2 CO 3 the CaCO 3 and MgO , the activation energy increase , indicating that the reaction rate on the temperature -sensitive the degree of strengthening and the pre-exponential factor increases accordingly , that offers more reactive sites , and activation energy decreased as the main factors affecting the reaction rate with the increase of the added amount . Alkali metal, alkaline earth metal solution loss reaction of coke catalysis is the result of joint action by lowering the activation energy and increase the active center .

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CLC: > Industrial Technology > Chemical Industry > Coke chemical industry > General issues > Basic theory
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