Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation

Stevanović, Vladimir D.; Petrović, Milan M.; Wala, Tadeusz; Milivojević, Sanja; Ilić, Milica; Muszynski, Slawomir

doi:10.1016/j.energy.2019.115980

Cited by 29 publications

(8 citation statements)

References 15 publications

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“…Lignite was widely used for electricity generation by combustion in power plants because of its high reactivity, abundant reserves, and low price. [1][2][3][4][5][6] However, due to the low degree of coal metamorphism, lignite had the defects of high moisture content, low thermal stability, and low calorific value, which significantly affected the efficient and large-scale utilization of lignite. [7][8][9] The studies focused on combustion performance of lignite reported that high moisture content not only affected the combustion behavior but also greatly reduced the combustion efficiency of lignite.…”

Section: Introductionmentioning

confidence: 99%

“…Lignite was widely used for electricity generation by combustion in power plants because of its high reactivity, abundant reserves, and low price 1–6 . However, due to the low degree of coal metamorphism, lignite had the defects of high moisture content, low thermal stability, and low calorific value, which significantly affected the efficient and large‐scale utilization of lignite 7–9 …”

Section: Introductionmentioning

confidence: 99%

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Combustion performance of lignite after efficient upgrading via deep eutectic solvent‐assisted hydrothermal dewatering

Huang

et al. 2023

Asia-Pacific J Chem Eng

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In order to increase the efficiency of hydrothermal dewatering (HD), a deep eutectic solvent (DES, synthesized by ChCl and ZnCl2) was employed to promote the removal of moisture and oxygen from lignite. The variation of physicochemical structure of upgraded coals greatly affected the combustion performance. The effects of addition amount of DES, upgrading temperature, and the molar ratio by ChCl and ZnCl2 on combustion performance of upgraded coals were analyzed via thermogravimetric analysis. Compared with HD lignite upgraded at 280°C, the combustion curves of DES‐HD lignite were shifted and delayed toward a higher temperature zone as DES additions increased. DES‐HD lignite had lower spontaneous combustion tendency and higher combustion reactivity. When upgrading temperature increased from 250 to 300°C, the combustion curves of lignite upgraded with 3.0‐g DES (ChCl:ZnCl2 = 1:1) first moved to the low‐temperature zone and then shifted to the high‐temperature zone. DES‐HD lignite maintained the advantages of raw coal in terms of combustion characteristics. For lignite upgraded with different molar ratios of ZnCl2 in DES, the difference in combustion behavior was mainly manifested in the burnout stage. The burnout stage was advanced slightly as the molar ratio of ZnCl2 increased.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Combustion performance of lignite after efficient upgrading via deep eutectic solvent‐assisted hydrothermal dewatering

Huang

et al. 2023

Asia-Pacific J Chem Eng

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“…The direct-contact spray tower reduces the flue gas temperature by relying on the cold source medium. Compared with the traditional noncontact heat exchanger, the direct-contact spray tower has obvious advantages in the heat-transfer area and temperature difference. − The direct-contact spray tower also helps to avoid the corrosion phenomenon of the heat-transfer material and reduce the operation cost and maintenance cost. In order to efficiently recover the waste heat of saturated flue gas, the literature designed a cooling tower device with an operation resistance no more than 240 Pa, and the device can recover waste heat with 24 MW in the 140 MW boiler.…”

Section: Introductionmentioning

confidence: 99%

“…The directcontact spray tower reduces the flue gas temperature by relying on the cold source medium. Compared with the traditional noncontact heat exchanger, 15 the direct-contact spray tower has obvious advantages in the heat-transfer area and temperature difference. 16−18 The direct-contact spray tower also helps to avoid the corrosion phenomenon of the heat-transfer material and reduce the operation cost and maintenance cost.…”

Section: Introductionmentioning

confidence: 99%

Research on Thermodynamic Characteristics of the Saturated Flue Gas Waste Heat Recovery to Reduce Turbine Extraction Steam

Teng,

Lu,

Chen

et al. 2023

ACS Omega

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“…Different types of systems have been investigated, such as low pressure economizer, [17] by pass staged economizer, [18][19][20] additional economizer. [21] Ma et al [22] performed techno-economic analysis of a novel hot air recirculation process for exhaust heat recovery from a 600 MW brown-coal-fired boiler. However, none of them considered the separate preheating of primary air and secondary air through by pass flue gas, which could be integrated with high pressure economizer to improve the boiler efficiency and power output.…”

Section: Introductionmentioning

confidence: 99%

Energy, exergy and economic analyses of lignite power plant integrated with flue gas pre-drying and a novel boiler exhaust gas waste heat recovery system

Liu¹,

Liu²,

Liu³

et al.

Proceedings of the 22nd International Drying Symposium on Drying Technology - IDS '22

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Lignite is an important alternative fuel for electricity generation worldwide. However, lignite based power generation systems used to suffer from limited thermal efficiency resulting from the high moisture inherently contained in the fuel. Integration of pre-drying has been a proven upgrading technology for lignite power stations. In the present work, two different systems for heat utilization from lignite pre-drying and boiler exhaust flue gases were proposed, including flue gas pre-drying and waste heat utilization system, and a novel type of boiler exhaust waste heat recovery system. Energy, exergy and economic analyses models were established to explore the energy saving principle of lignite drying and waste heat utilization. Case study in a 660 MW air-cooling unit indicated that the plant thermal efficiency could be improved by 1.04 %-pts and 0.75 %-pts in lignite flue gas pre-drying and boiler exhaust gas waste recovery scenarios, respectively. The adoption of pre-evaporation and waste heat recovery would reduce exergy destructions in combustion process and heat transfer process by 3.53% and 0.68%, respectively. The levelised cost of electricity would be reduced by 0.72 $/MWh and 0.30 $/MWh, respectively. The integration of flue gas pre-drying, indirect firing and heat recovery system was more suitable for medium to high moisture lignite boiler. The proposed boiler exhaust gas waste heat recovery system was also feasible for medium moisture content lignite boiler. Overall, the results indicated that the integration of the proposed systems would make the lignite-fired power plants more efficient and cost-effective.

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Efficiency and power upgrade at the aged lignite-fired power plant by flue gas waste heat utilization: High pressure versus low pressure economizer installation

Cited by 29 publications

References 15 publications

Combustion performance of lignite after efficient upgrading via deep eutectic solvent‐assisted hydrothermal dewatering

Combustion performance of lignite after efficient upgrading via deep eutectic solvent‐assisted hydrothermal dewatering

Research on Thermodynamic Characteristics of the Saturated Flue Gas Waste Heat Recovery to Reduce Turbine Extraction Steam

Energy, exergy and economic analyses of lignite power plant integrated with flue gas pre-drying and a novel boiler exhaust gas waste heat recovery system

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