Efficiency and power upgrade by an additional high pressure economizer installation at an aged 620聽MWe lignite-fired power plant

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• 作者：Vladimir D. Stevanovic^a ; ^{vstevanovic@mas.bg.ac.rs" class="auth_mail} ; ^{estevavl@eunet.rs" class="auth_mail} ; Tadeusz Wala^b ; ^{tadeusz.wala@rafako.com.pl" class="auth_mail} ; Slawomir Muszynski^c ; ^{slawomir.muszynski@rafako.com.pl" class="auth_mail} ; Milos Milic^d ; ^{milosmilic@tent.rs" class="auth_mail} ; Milorad Jovanovic^d ; ^{milorad.jovanovic@tent.rs" class="auth_mail}
• 关键词：Waste heat ; Flue gas ; Economizer ; Boiler
• 刊名：Energy
• 出版年：1 March, 2014
• 年：2014
• 卷：66
• 期：Complete
• 页码：907-918
• 全文大小：978 K

文摘

An additional high pressure economizer was installed at Unit B1 of the 620聽MWe lignite-fired Power Plant 鈥淣ikola Tesla B鈥?after 30 years of its operation. An innovative connection of the new additional economizer was applied. It is in parallel connection to the first section of the originally built economizer and it is directly fed with the feedwater from the outlet of the feedwater pump. The analysis of Unit B1 operation with such an economizer arrangement is performed and it is supported by measured data. It is shown that more than 30聽MWth of the flue gas waste heat is recovered. The Unit gross efficiency is increased by 0.53 percentage points, which leads to 9.4聽MWe of the electric power production. The parallel connection of the additional economizer also leads to the partial feedwater bypass of the high pressure heaters, which enables an increase of the plant electric power by up to 24.5聽MWe. The accompanying effects are the reduction of the pressure drop in the feedwater line and the economizers, which leads to the decrease of the energy consumption for the main feedwater pump operation. The applied solution is presented together with measured and calculated energy and economic benefits.