Abstract This paper highlighted the need for periodic change in country specific NCVs and CEFs of solid fuels. Accepted India specific NCV/CEF values of coking coal, non-coking coal and lignite were worked out during the India’s Initial National Communication’2004 taking 1994 as the base year. Those values continued to be in use in CO2 estimations done by sectoral/national/international agencies and also in estimations related to India’s Second National Communication’2012 to UNFCCC. In present investigation fresh estimations taking base year as 2007 were done considering large numbers of relevant post 2006 coal-quality data for each Indian coal category and as a result NCV of non-coking and coking coal diminished by 6.6% and 2.1% respectively. The changes happened due to cumulative effect of slow changing quality of coking, non-coking coals and their grade-wise production pattern over the years. Using new NCV-CEF values, reduction of CO2 emission by 53.4 Tg, solid fuel (coal and lignite) emission by 5.4%, total fossil fuel emission by 3.8%, sectoral emissions by 2.7%–5.9% were observed. The relevance of new NCV-CEF values were examined in present context and the new values should be used for accurate estimation of CO2, which indicates energy efficiency and clean use of coals.

中文翻译：

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在印度背景下修订所有煤炭类别的国家特定 NCV 和 CEF 及其对燃煤活动 CO2 排放估算的影响

摘要 本文强调了定期更改国家特定固体燃料 NCV 和 CEF 的必要性。接受的印度特定的炼焦煤、非炼焦煤和褐煤的 NCV/CEF 值是在 2004 年印度的初始国家通讯中以 1994 年为基准年制定的。这些值继续用于部门/国家/国际机构所做的二氧化碳估算，以及与印度向 UNFCCC 提交的 2012 年第二次国家信息通报相关的估算。在目前的调查中，以 2007 年为基准年进行了新的估计，考虑了印度每个煤炭类别的大量 2006 年后相关煤炭质量数据，因此非焦煤和炼焦煤的 NCV 分别减少了 6.6% 和 2.1%。这些变化是由于焦化质量缓慢变化的累积效应而发生的，多年来非焦煤及其分级生产模式。使用新的 NCV-CEF 值，观察到二氧化碳排放量减少 53.4 Tg，固体燃料（煤和褐煤）排放量减少 5.4%，化石燃料总排放量减少 3.8%，部门排放量减少 2.7%–5.9%。在当前背景下检查了新 NCV-CEF 值的相关性，新值应用于准确估计 CO2，这表明能源效率和煤炭的清洁使用。