Efficiency improvement through waste heat reduction

Semkov, Krum; Mooney, Emma; Connolly, Michael; Adley, Catherine C.

doi:10.1016/j.applthermaleng.2014.05.030

Cited by 36 publications

(15 citation statements)

References 3 publications

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“…WHR CB has approximately 2% higher efficiency than that of existing CB and has the highest efficiency among existing boilers because WHR CB preheats the air supplied to the combustor using the sensible heat of the exhaust gases and the latent heat of the water. Especially, Semkov et al proposed a simplified method to improve the efficiency through waste heat reduction in industrial systems [9] and Yang et al presented a new concept of boilers with waste heat recovery for the industrial system, which was achieved the high energy efficiency improvement and great economic benefits [10].…”

Section: Introductionmentioning

confidence: 99%

An analysis of the thermodynamic efficiency for exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB)

Lee

2015

Energy

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Section: Introductionmentioning

confidence: 99%

An analysis of the thermodynamic efficiency for exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB)

Lee

2015

Energy

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“…The technical, energy and exergy analyzes, which carried out in works [3][4][5][6], showed that heat recovery from flue gases can become one of the methods for increasing the efficiency of the boiler. In the work of the authors Saidur et al [6] one of the methods for increasing the boiler's energy efficiency is the using the electric drive of a variable speed boiler fan.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Control System of Fuel Combustion in Boilers with Oxygen Sensor

Zaporozhets

2019

Period. Polytech. Mech. Eng.

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The method of fuel quality control is considered, which is based on the using of the oxygen sensor (without sensors of incomplete fuel combustion products). An algorithm for the electric drive of a fan is proposed, which is based on a step changing in the rotation speed. The choice of broadband oxygen sensor as a basis for the development of a fuel combustion control system is determined. In the course of experimental studies, the possibility of reconstructing the boiler by replacing a burner with an installed control system was demonstrated. The commissioning works were carried out with the installed system, the optimum operating conditions of the boiler were determined (with the formation of CO in the flue gases at a minimum level <50 ppm). The technical characteristics of the boiler operation under different loads (from 10 % to 100 %) are considered. Ecological and economic analysis of the developed fuel combustion control system was carried out.

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“…The investigation of exergy destructions within the whole plant with 600 and 660 MW supercritical coal-fired power generation units were also conducted by Liu and Duan (Liu, et al, 2010) and Yang et al (Yang, et al, 2013), respectively. The exergy equilibrium method has also been extensively applied to the analysis of energy consumption and economic efficiency of systems, including solar energy combined power generation (Zhu, et al, 2016;Adibhatla, et al, 2017), combined cycle power generation (Nami, et al, 2017), ground source heat pump system (Menberg, et al, 2017), lignite drying power generation (Han, et al, 2017), poly-generation with circulating fluidized bed (Gürtürk, et al, 2016;Tumen Ozdil, et al, 2016), optimization of heat supply network (Semkov, et al, 2014), distributed energy (Compton, et al, 2017), organic Rankine cycle (Darvish, et al, 2015;Zhao, et al, 2017), and CO 2-capturing (Jin, et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Energy-loss mechanism of boilers system in large-scale coal-fired power plants and the corresponding energy-saving approaches

Wang

Yu-zhao²,

Xuan

et al. 2019

JTST

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To evaluate the energy efficiency of the energy conversion and transfer, and the dig energy-saving potential during coal-fired power generation, the energy-loss mechanism was determined through a comparative analysis of thermal and exergy equilibria. Energy loss is first identified as exergy destruction, which is then gradually collected and finally discharged in the form of waste heat through terminals such as a condenser. Furthermore, the exergy-destruction distribution represents the theoretical energy-saving potential, which occurs mainly in the boiler. Accordingly, an in-depth study was conducted on the technical approaches to reduce the combustion-and heat transfer-induced exergy-destruction and other exergy-destruction in the boiler. These technical approaches include elevating hot-air temperature, oxy combustion, reducing excess air coefficient, and increasing the main steam/reheated steam parameters. Results show that technical solutions of elevating the hot-air temperature, increasing the air oxygen content, elevating the main steam/reheated steam temperature, and increasing the main steam pressure can reduce the net coal-consumption rate of a coal-fired power unit by 6-9, 6-10, 11, and 5-12 g/kW•h, respectively. These conclusions indicate the direction of the development of energy-saving technologies for coal-fired power generation.

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Efficiency improvement through waste heat reduction

Cited by 36 publications

References 3 publications

An analysis of the thermodynamic efficiency for exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB)

An analysis of the thermodynamic efficiency for exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB)

Analysis of Control System of Fuel Combustion in Boilers with Oxygen Sensor

Energy-loss mechanism of boilers system in large-scale coal-fired power plants and the corresponding energy-saving approaches

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