Effects of exhaust gas recirculation on the thermal efficiency and combustion characteristics for premixed combustion system

Yu, Byeong-Hun; Kum, Sung-Min; Lee, Chang-Eon; Lee, Seungro

doi:10.1016/j.energy.2012.10.057

Cited by 51 publications

(11 citation statements)

References 18 publications

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“…Hu, Pei et al [22,23] applied FGR to oxycoal combustion, and found that the nitrogen oxide content in the flue gas decreased significantly. Byeonghun et al [24] conducted experiments with gas-fired boilers of laboratory scale and found that when FGR increased under the same air equivalent, the phenomenon of red heat on the burner surface decreased significantly, which confirmed the advantages of FGR in improving the safe operation of the unit. Liu et al [25] conducted quantitative analysis on the performance of incinerator HRSG under different FGR through experimental research.…”

Section: Of 21mentioning

confidence: 96%

Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control

Yue

Shi

2020

Energies

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In this paper, the simulation software EBSILON is used to simulate the reheat units, and the reheat temperature control mode is deeply explored. In the benchmark system, the influence of different load intermediate point temperature on the flue gas recirculation (FGR) is analyzed. Then, the effects of load, coal quality, excess air factor, and feed water temperature on FGR are studied under the premise of intermediate point temperature as design value, and the cause for FGR change is analyzed by comparing the cutoff bypass flue (CBF) system. The results show that under any load, the FGR decreases with the increase of the intermediate point temperature, while under low load, the change of the intermediate point temperature has a greater impact on the FGR rate. When the intermediate point temperature remains constant, the FGR plunge has an increase of load at low load and is almost unchanged at high load; the FGR rate of coal with low calorific value and high moisture content is low and the coal with low volatile and high ash content has great influence on reheat steam temperature; and the excess air factor and feed water temperature are inversely proportional to the flue gas recirculation rate. In the CBF system, the change trend is similar to the reference system, but under the same working condition, the FGR rate is higher than the latter.

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Section: Of 21mentioning

confidence: 96%

Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control

Yue

Shi

2020

Energies

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“…To achieve this goal, we have studied the effect of exhaust gas recirculation (EGR) on the thermal efficiency and pollutant emission characteristics of various EGR ratios and equivalence ratios [11,12]. In these studies, the EGR method was shown to reduce pollutant emission and increase the boiler thermal efficiency.…”

Section: Introductionmentioning

confidence: 98%

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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“…Exhaust gas recirculation in technological and generating units is an effective means of improving the technical and economic indicators of their work [1], [2]. Through reducing the temperature gradient in the working volume during recirculation, the deviation of the materials temperature can be reduced from the set value to the values required by the technology and their quality heating can be ensured [3].…”

Section: Introductionmentioning

confidence: 99%

Research into limits of gas-fired burners flame stabilization in the flue gas recirculation

Ivanov¹,

Polishchuk²,

Holiakova³

et al. 2020

Min. miner. depos.

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Determining the flue gas recirculation effect on the verge of the gas-fired burners flame stabilization based on experimental industrial research. Methods. The studies were conducted on a circular heating furnace with a diameter of 30 m of the Interpipe NTRP wheelrolling workshop. The furnace for blanks heating to 625 ± 25°C with their isothermal holding has 5 zones with an adjustable and systematic supply of natural gas. To increase the thermal performance efficiency, the furnace has been equipped with an external exhaust gas recirculation system. When assessing the burners forcing ability of the after their ignition, the gas consumption, as well as recycled gas consumption was increased gradually in a predetermined ratio. Therewith, gas consumption was determined at the time of the flame-out, which was recorded visually. Findings. Based on a comprehensive analysis, the factors have been revealed, which affect the sustainability of the burner operating modes when exhaust flue gases are fed into the combustion zone. It is shown that the most rational for analyzing the recirculation influence on gas combustion stability is the use of criterion empirical models that take into account the complex of physical-chemical characteristics of the reagents, parameters of the combustion mode, gas-dynamic and design burner peculiarities. A criterion model has been obtained for the loss of a diffusion flame in combined "pipe-in-pipe" type burners when burning gas fuel in a medium of recycle flue gases with a temperature of 140-200°C and an oxygen composition of 15.4-19.6% in them. Dependences have been determined for assessing the expansion of combustion stability limits with a change in the coefficient of the oxidising agent consumption, its temperature, and the recirculation ratio. Originality. New computational models have been obtained for assessing the limits of the flame stabilization of straightflow gas burners during flue gas recirculation. The ratios have also been found of the recirculation ratio and the oxidising agents temperatures, that provide the conditions of their identical work for the flame-out and flame backflash when replacing the air with recycled gas for fuel combustion. Practical implications. The results make it possible to make a reasonable choice of burners and combustion standard parameters that ensure the safe unit operation during flue gas recirculation.

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Effects of exhaust gas recirculation on the thermal efficiency and combustion characteristics for premixed combustion system

Cited by 51 publications

References 18 publications

Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control

Analysis of Gas Recirculation Influencing Factors of a Double Reheat 1000 MW Unit with the Reheat Steam Temperature under Control

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

Research into limits of gas-fired burners flame stabilization in the flue gas recirculation

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