Water extraction from high moisture lignite by means of efficient integration of waste heat and water recovery technologies with flue gas pre-drying system

Han, Xinyan; Yan, Junjie; Karellas, Sotiriοs; Liu, Ming; Kakaras, Emmanuel; Feng, Xiao

doi:10.1016/j.applthermaleng.2016.08.178

Cited by 46 publications

(7 citation statements)

References 46 publications

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“…c: Cost is quoted from Moaseri [29]. d: The parameters are based on [15].e: The parameters are based on [26,30].…”

Section: Estimation Of the Total Investment Costmentioning

confidence: 99%

“…Except for those traditional measures to improve the performance of the steam cycle design [8,9], e.g., employing more feedwater preheaters or reheaters [8,[10][11][12] and applying optimal steam cycle design [8,13,14], another effective way, which has been a hot topic in recent years [15,16], is the indepth utilization of low-temperature waste heat from the exhausted flue gas. To achieve this goal, mostly low-temperature economizers (LTE) are configured after or parallel to the air preheater to recover the waste heat from the flue gas to heat up a part of the condensate water [17,18].…”

Section: Introductionmentioning

confidence: 99%

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An Improved System for Utilizing Low-temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

Huang¹,

Li²,

Tan³

et al. 2017

Preprint

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In this paper, an improved system to efficiently utilize the low-temperature waste heat (WHUS) from the flue gas of coal-fired power plants is proposed based on heat cascade. The essence of the proposed system is that the waste heat of exhausted flue gas is not only used to preheat air for assisting coal combustion as usual but also to heat up feedwater and the low-pressure steam extraction. Preheated by both the exhaust flue gas in the boiler island and the low-pressure steam extraction in the turbine island, thereby part of the flue gas heat in the air preheater can be saved and introduced to heat the feedwater and the high-temperature condensed water. Consequently, part of the high-pressure steam is saved for further expansion in the steam turbine, which obtains additional net power output. Based on the design data of a typical 1000 MW ultra-supercritical coal-fired power plant in China, in-depth analysis of the energy-saving characteristics of the optimized WHUS and the conventional WHUS is conducted. When the optimized WHUS is adopted in a typical 1000 MW unit, net power output increases by 19.51 MW, exergy efficiency improves to 45.46%, and net annual revenue reaches 4.741 million USD. In terms of the conventional WHUS, these aforementioned performance parameters are only 5.83 MW, 44.80% and 1.244 million USD, respectively. The research of this paper can provide a feasible energy-saving option for coal-fired power plants.

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“…c: Cost is quoted from Moaseri [29]. d: The parameters are based on [15].e: The parameters are based on [26,30].…”

Section: Estimation Of the Total Investment Costmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Improved System for Utilizing Low-temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

Huang¹,

Li²,

Tan³

et al. 2017

Preprint

View full text Add to dashboard Cite

show abstract

“…Normally, the amount of desulfurization wastewater produced is 15 to 20 kg/(MW•h). Accordingly, the flow rate of desulfurization wastewater produced by 600 MW units was estimated around 10 m 3 /h [2,3]. Although it is much lower than that in seawater desalination plants, the desulfurization wastewater is generally featured by high content of suspended solids, COD (chemical oxygen demand), fluoride and heavy metals such as As, Hg, Pb [4].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Economic Analyses of Desulfurization Wastewater Recovery in Coal-Fired Power Plants

Han,

Zhao,

Zhang

et al. 2020

Preprint

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“…c: Cost is quoted from Moaseri [33]. d : The parameters are based on [19]. e : The parameters are based on [22,30].…”

Section: Estimation Of the Total Investment Costmentioning

confidence: 99%

“…In addition to the traditional measures used to improve the performance of the steam cycle design [8][9][10], e.g., employing more feedwater preheaters or reheaters [11][12][13][14][15][16] and applying optimal steam cycle design [11,17,18], another effective way which has been widely discussed in recent years [19,20], is the in-depth utilization of low-temperature waste heat from the exhausted flue gas. To achieve this, low-temperature economizers (LTEs) are usually configured after or parallel to the air preheater to recover the waste heat from the flue gas to heat up a part of the condensate water [21,22].…”

Section: Introductionmentioning

confidence: 99%

An Improved System for Utilizing Low-Temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

Huang

Tan

et al. 2017

Entropy

View full text Add to dashboard Cite

Abstract:In this paper, an improved system to efficiently utilize the low-temperature waste heat from the flue gas of coal-fired power plants is proposed based on heat cascade theory. The essence of the proposed system is that the waste heat of exhausted flue gas is not only used to preheat air for assisting coal combustion as usual but also to heat up feedwater and for low-pressure steam extraction. Air preheating is performed by both the exhaust flue gas in the boiler island and the low-pressure steam extraction in the turbine island; thereby part of the flue gas heat originally exchanged in the air preheater can be saved and introduced to heat the feedwater and the high-temperature condensed water. Consequently, part of the high-pressure steam is saved for further expansion in the steam turbine, which results in additional net power output. Based on the design data of a typical 1000 MW ultra-supercritical coal-fired power plant in China, an in-depth analysis of the energy-saving characteristics of the improved waste heat utilization system (WHUS) and the conventional WHUS is conducted. When the improved WHUS is adopted in a typical 1000 MW unit, net power output increases by 19.51 MW, exergy efficiency improves to 45.46%, and net annual revenue reaches USD 4.741 million while for the conventional WHUS, these performance parameters are 5.83 MW, 44.80% and USD 1.244 million, respectively. The research described in this paper provides a feasible energy-saving option for coal-fired power plants.

show abstract

Water extraction from high moisture lignite by means of efficient integration of waste heat and water recovery technologies with flue gas pre-drying system

Cited by 46 publications

References 46 publications

An Improved System for Utilizing Low-temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

An Improved System for Utilizing Low-temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

Thermodynamic and Economic Analyses of Desulfurization Wastewater Recovery in Coal-Fired Power Plants

An Improved System for Utilizing Low-Temperature Waste Heat of Flue Gas from Coal-Fired Power Plants

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