Radiative energy flux characteristics and model analysis for one-dimensional fixed-bed oxy-coal combustion

Shan, Shiquan; Zhou, Zhijun; Wang, Zhihua; Cen, Kefa

doi:10.1631/jzus.a1800648

Cited by 9 publications

(7 citation statements)

References 35 publications

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“…It is believed that the radiative intensity is related to the radiative temperature, which is the temperature on the flame surface. In this study, it is believe that the temperature controlled by the tube furnace is the combustion temperature of fuel, 8,12 which is slightly different from the actual flame surface temperature. Nevertheless, there is a positive correlation between them; thus, the combustion temperature is used as a variable to study the characteristics of radiative energy.…”

Section: Items Exergy Loss Ratementioning

confidence: 95%

“…In the experiment, control variables method was used so that the comparison between different conditions has general significance. In general, tube furnace experiments provide good representations of fixed‐bed reactors such as chain furnaces, and the radiation flux undergoes changes in a tube furnace . In order to provide a reference for the actual pulverized coal furnace in the current study, the estimated radiation flux was the average value during the period from 80 to 140 seconds because the radiation flux variation was relatively stable in this stage .…”

Section: Experiments and Modelsmentioning

confidence: 99%

“…12 In order to provide a reference for the actual pulverized coal furnace in the current study, the estimated radiation flux was the average value during the period from 80 to 140 seconds because the radiation flux variation was relatively stable in this stage. 12 That is, we selected the recorded data in a consecutive time range of 1 minute and calculated the average value as experiment results. In the experiment, the instrument uncertainty was 3% for the radiation sensor according to its instruction book.…”

Section: Oxy-coal Combustion Experimentsmentioning

confidence: 99%

“…The experimental conditions included an oxygen ratio of 21% to 60% for the O 2 /CO 2 atmosphere at 800°C and a temperature range of 600°C to 1000°C in a 30% O 2 /CO 2 atmosphere. This conditions were chosen because a 30% O 2 /CO 2 atmosphere is often used as an alternative air combustion condition and thus, we adjusted the parameter range based on 30% and selected the oxygen ratio of 21% to 60% according to Shan et al Moreover, the experiment temperature range of 600°C to 1000°C is selected based on the average temperature of most combustion . In the experiment, control variables method was used so that the comparison between different conditions has general significance.…”

Section: Experiments and Modelsmentioning

confidence: 99%

“…However, there are few studies on radiative energy in combustion from the perspective of energy utilization. Shan et al recently investigated the radiation characteristics of bituminous coal combustion in a fixed‐bed reactor; it was demonstrated that the radiative energy in combustion can be used separately to improve efficiency. Therefore, it needs further study on how to use radiative energy in combustion to improve the efficiency of energy conversion.…”

Section: Introductionmentioning

confidence: 99%

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A novel flame energy grading conversion system: Preliminary experiment and thermodynamic parametric analysis

et al. 2019

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Summary The focus of this study is to improve the efficiency of the thermal power cycle from the perspective of photo energy and thermal energy grading conversion. A new concept of combined radiation and heat engine model was proposed to establish a novel flame energy grading conversion system based on photovoltaic conversion and the Rankine cycle. From the perspective of energy utilization, the spectral radiative energy characteristics in oxy‐coal combustion were experimentally investigated, and a preliminary thermodynamic model of the new system was established based on the experimental results. Finally, energy and exergy analyses were conducted to determine the general characteristics of the proposed system and assess the improvements to the Rankine cycle. The results indicated that temperature was the main factor affecting the short‐waveband energy ratio. Compared with the Rankine cycle, the new flame energy grading conversion system improved the system efficiency by about 3.5%. The exergy analysis indicated that the proposed system reduced the exergy loss factor in the heat transfer of the boiler by about 3% to 6%. This study provides references for improving the thermal power cycle efficiency.

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Section: Items Exergy Loss Ratementioning

confidence: 95%

Section: Experiments and Modelsmentioning

confidence: 99%