燃煤电厂烟气含水量对活性焦脱硝效率的影响研究

Research on influence of coal-fired power plant flue gas moisture content on denitrification efficiency of activated coke

为研究燃煤电厂烟气中水蒸气含量对活性焦脱硝效率的影响,采用住友重机械工业株式会社的活性焦脱硝评价方法,使用不同水蒸气含量的模拟烟气对典型商用活性焦进行脱硝效率试验。结果发现:活性焦平均脱硝效率随模拟烟气中水蒸气含量的升高逐渐降低;当烟气中水蒸气体积分数为10%时,活性焦的平均脱硝效率为45.2%,水蒸气体积分数为15%时,其平均脱硝效率为34.7%,水蒸气体积分数为20%时,其平均脱硝效率为33.5%,水蒸气体积分数为25%时,其平均脱硝效率为33.1%,水蒸气体积分数为30%时,其平均脱硝效率为31.4%;试验结果与已有学者研究的SCR动力学模型分析结果基本一致;结合活性焦脱硫效率的研究结果,当烟气中水蒸气体积分数控制在12%以下时,联合脱硫脱硝技术耦合的效率与经济性较佳。

In order to study the influence of moisture content in the flue gas of coal-fired power plant on the denitrification efficiency of activated coke, with the activated coke denitrification evaluation method of Sumitomo Heavy Industries, Ltd., the denitrification efficiency of typical commercial activated coke was tested using simulated flue gas with different moisture contents. The test results showed that the average denitrification efficiency of activated coke decreased gradually with the increase of water vapor content in the simulated flue gas. When the volume fraction of water vapor in the flue gas was 10%, the average denitrification efficiency of activated coke was 45.2%;when the volume fraction of water vapor was 15%, its average denitrification efficiency was 34.7%;when the volume fraction of water vapor was 20%, its average denitrification efficiency was 33.5%;when the volume fraction of water vapor was 25%, its average denitrification efficiency was 33.1%;when the volume fraction of water vapor was 30%, its average denitrification efficiency was 31.4%. The test results were basically consistent with the existing SCR kinetic model analysis results studied by scholars. In combination with the research result of activated coke desulfurization efficiency, it was found that when the moisture content of the flue gas was controlled below 12%, there were good coupling efficiency and economy of the combined desulfurization and denitrification technology.