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煤對二氧化碳化學反應性的測定

发布时间：2011-10-28 点击次数：1696次

煤的化驗反應性又稱活性，是指在一定溫度條件下，煤與不同氣體介質如二氧化碳、氧或水蒸氣相互作用的能力而言。因此煤的化學反應性直接反應煤在氣化爐中還原層的化學反應能力。反應性強弱還直接影響爐子的耗煤量、耗氧量及煤氣中的有效成分等。

煤的化学反应性是一项重要的气化和燃烧特性指标。煤的化学反应性表示方式很多，总的来说有5种：1、直接以反映速度表示；2以反应物分解率或还原率表示；3、以活化能表示；4、以同一温度下产物的最大百分浓度或百分浓度与时间关系做题表示；5、以着火点或平均燃烧速度表示。

本方法是以CO₂作爲氣體介質，在一定的溫度下CO₂氣體與煤中的碳進行反應，其中一部分被還原成CO₂。已被還原成CO的CO₂量占通入CO₂數量的百分數也就是二氧化碳還原率α%作爲煤對二氧化碳化學反應性指標。

一、方法要点

先将煤样干馏，除去挥发物。然后筛分并选取一定粒度的焦渣装入反应管中加热。加热到一定温度以后，以一定流量通入二氧化碳。测定反应后气体中二氧化碳的含量，已被还原成一氧化碳的二氧化碳总量的百分数（α%）作为煤对二氧化碳的化学反应性指标。

二、试剂

1、无水氯化钙

2、硫酸：相对密度1.84.

3、氢氧化钾或氢氧化钠溶液：约500g/L

4、钢瓶二氧化碳气：纯度98%以上。

三、仪器、设备

1、反应性测定仪

2、管式干馏炉

3、气体分析器

4、气压计

5、圆孔筛

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