CAJ | 학술논문

在褐煤发电系统中,对褐煤进行预干燥可以明显提高燃褐煤发电系统效率,而褐煤预干燥过程中产生的干燥尾气废热的回收利用可以进一步提高系统效率。为了研究尾气废热回收对系统效率的影响,该文建立了干燥机热平衡模型,并且应用等效热降法建立了该系统干燥尾气废热回收的理论分析模型。该文针对某600 MW燃褐煤机组,对其干燥尾气废热回收的节能潜力进行了分析,并且对干燥机、原煤预热器和给水加热器热效率对整厂热效率的影响进行了计算。计算结果表明：在基准工况下采用原系统,可以节煤11.44 g/（kW h）,而采用废热回收,系统的节煤量可提高到14.65 g/（kW h）;干燥机效率对整厂效率的影响最为明显,干燥机效率每提高10%,可以增加节煤量达1.8 g/（kW h）。
재갈매발전계통중,대갈매진행예간조가이명현제고연갈매발전계통효솔,이갈매예간조과정중산생적간조미기폐열적회수이용가이진일보제고계통효솔。위료연구미기폐열회수대계통효솔적영향,해문건립료간조궤열평형모형,병차응용등효열강법건립료해계통간조미기폐열회수적이론분석모형。해문침대모600 MW연갈매궤조,대기간조미기폐열회수적절능잠력진행료분석,병차대간조궤、원매예열기화급수가열기열효솔대정엄열효솔적영향진행료계산。계산결과표명：재기준공황하채용원계통,가이절매11.44 g/（kW h）,이채용폐열회수,계통적절매량가제고도14.65 g/（kW h）;간조궤효솔대정엄효솔적영향최위명현,간조궤효솔매제고10%,가이증가절매량체1.8 g/（kW h）。
Lignite pre-drying can improve lignite-fired power system efficiency obviously,and the waste heat recovery can improve efficiency further.In order to consider the effect of waste heat recovery on the system thermal efficiency,this paper established the thermal equilibrium model of the dryer and the theoretical analysis model of waste heat recovery with the application of equivalent heat drop method.The energy saving potential with waste heat recovery was analyzed on an existing 600 MW lignite-fired power plant,and the influence of dryer efficiency,coal preheater efficiency and water heater efficiency on system efficiency improvement were calculated.The results show that： coal consumption rate reduction of pre-dried lignite-fired power system improves from 11.44 g/（kW h） to 14.65 g/（kW h） with waste heat recovery;the dryer efficiency is the most obvious factor on system efficiency,and when 10% higher dryer efficiency is improved the coal consumption rate can increase 1.8 g/（kW h）.