Abstract

Modern trends in technical reequipment of coal-fired thermal power stations (TPS) are analyzed by the example of the Verkhnetagil’skaya District Power Station (GRES), where obsolete coal-fired power units requiring replacement were in operation. This problem is specific for many Russian thermal power stations. Two alternatives of reequipment are considered: replacement of obsolete steam-turbine power units with a natural gas-fired combined cycle unit (CCU) and conversion of coal-fired power units into integrated gasification combined-cycle units (IGCCU) with gas turbines operating on purified synthesis gas. Technical reequipment of the considered TPS was performed by replacing the coal-fired steam-turbine power units of phase I–II with a 420 MW CCU. The CCU core was a 288 MW Siemens SGT5-4000F gas turbine. A CCU on its basis was modelled in the THERMOFLEX code. The calculated results demonstrated high power and environmental effectiveness in replacement of coal-fired power units at TPSs with natural gas-fired CCUs, thereby cutting down coal equivalent consumption by 727 000 t.c.e. (or 24%). For conversion of a TPS to an IGCCU, the fuel saving could be as great as 543 000 t.c.e./year (18%) under comparable conditions. In this case, the atmospheric emissions (of dust and SO₂) could be decreased many times (by 99%) due to implementation of an effective gas treatment process in the gasification system. Due to the huge coal reserves in Russia, the conversion of coal-fired TPSs to modern technologies with coal gasification may be a promising alternative for many TPSs during their reconstruction. In addition, it will contribute to improving the country’s energy security. In addition, this will improve the country’s energy security.

中文翻译：

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基于煤气化和联合循环机组的燃煤火力发电厂改造前景分析

摘要

以Verkhnetagil'skaya区域发电站（GRES）为例分析了燃煤火力发电厂（TPS）技术更新的现代趋势，其中需要更换的陈旧燃煤火力发电厂正在运行。这个问题是俄罗斯许多火力发电厂特有的。考虑了两种替代设备：用天然气联合循环机组（CCU）替换过时的蒸汽轮机发电单元，以及使用在运行中的燃气轮机将燃煤发电单元转换为整体气化联合循环单元（IGCCU）纯化的合成气。通过使用420兆瓦CCU更换I–II期的燃煤蒸汽轮机发电设备，对考虑的TPS进行了技术改造。CCU的核心是一台288 MW的西门子SGT5-4000F燃气轮机。基于CRM的基础是THERMOFLEX代码。计算结果表明，用天然气CCU代替TPS处的燃煤动力装置具有很高的动力和环境效益，从而减少了72.7万吨标准煤（或24％）的煤炭当量消耗。如果将TPS转换为IGCCU，在可比的条件下，每年可节省燃油多达543 000 tce /年（18％）。在这种情况下，₂）可以减少很多倍（减少99％），这是因为在气化系统中实施了有效的气体处理工艺。由于俄罗斯巨大的煤炭储量，将燃煤TPS转换为带有煤气化的现代技术可能是许多TPS改造期间的有前途的替代方案。此外，它将有助于改善该国的能源安全。此外，这将改善该国的能源安全。