The Effect of Temperature Distribution on Tube Rupture

Aydin, Ozer; Durak, Muhammet M.

doi:10.1299/jtst.7.753

Cited by 2 publications

(2 citation statements)

References 29 publications

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“…Even though the basic pulverized coal combustion technology was established many decades ago, there are still many types of problems in the operation of pulverized-coal-fired furnaces, e.g., fouling, slagging and sulfidation corrosion. To avoid these problems, the numerical simulation technology have been developed to predict the combustion characteristics in coal-fired boilers (e.g., Kurose et al, 2004, Hashimoto et al, 2007, Aydin and Durak, 2012. Some new models or methods for coal combustion field, e.g., the new devolatilization model (Hashimoto et al, 2012a, 2012b, Hashimoto et al, 2014, the new char combustion model (Umetsu et al, 2014), the skeletal mechanism for the volatile matter combustion (Ahn et al, 2016), the transported PDF model (Zhao et al, 2014), the velocity-scalar joint filtered density function model (Wen et al, 2015), the new heterogeneous combustion model (Vascellari et al, 2014), the large eddy simulation of coal combustion field (Rabacal et al, 2015, Olenik et al, 2015, have been developed recently.…”

Section: Introductionmentioning

confidence: 99%

Primary soot particle distributions in a combustion field of 4 kW pulverized coal jet burner measured by time resolved laser induced incandescence (TiRe-LII)

Hashimoto

Hayashi

Nakatsuka

et al. 2016

JTST

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To develop accurate models for the numerical simulation of coal combustion field, detailed experimental data using laser techniques, which can figure out the basic phenomena in a coal flame, are necessary. In particular, soot is one of the important intermediate substances in a coal flame. This paper is the first paper in the world reporting soot particle size distributions in a coal flame. The spatial distribution of the primary soot particle diameter were measured by the combination of the time-resolved laser induced incandescence (TiRe-LII) method and the thermophoretic sampling (TS) method. The primary soot particle diameter distribution was expressed by the log normal function based on the particle diameter measurement using SEM images obtained from the TS samples. The relative function between the signal decay ratio obtained by TiRe-LII and the primary soot particle diameter was defined based on the log normal function. Using the relative function, the spatial distributions of the primary soot particle diameter with the soot volume fraction were obtained. The results show that the small isolated soot regions instantaneously exist in the entire combustion field. This characteristics is different from spray combustion field. From the ensemble-averaged TiRe-LII images, it was found that the soot volume fraction and the primary soot particle diameter increases with increasing the height above the burner in any radial distance. It was also found that the volumetric ratio of small particles decreases with increasing radial distance at the region close to the burner exit. However, the variation of the soot particle diameter distribution along the radial direction becomes small in the downstream region. This tendency is caused by the turbulent mixing effect. It is expected that the accurate soot formation model will be developed in the near future by using the data reported in this paper.

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Section: Introductionmentioning

confidence: 99%

Primary soot particle distributions in a combustion field of 4 kW pulverized coal jet burner measured by time resolved laser induced incandescence (TiRe-LII)

Hashimoto

Hayashi

Nakatsuka

et al. 2016

JTST

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“…The Turkish lignite is characterised by rather high ash content, and consequently, with rather low calorific values (Atimtay et al, 2017). Pulverized combustion of Turkish lignite was computationally investigated in different applications by various researchers (Aydin and Durak, 2012).…”

Section: Introductionmentioning

confidence: 99%

COMPUTATIONAL ANALYSIS OF PULVERIZED COAL CO-FIRING WITH BIOMASS IN 150MWe UNIT OF TUNCBILEK THERMAL POWER PLANT

Deniz

Böke

Aydin

et al. 2021

Isı Bilimi Ve Tekniği Dergisi

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Pulverized coal and biomass co-firing in the 150MWe unit of Tuncbilek power plant is computationally investigated, within the scope of a preliminary feasibility study. The considered furnace, burning Turkish lignite, has totally eighteen burners, positioned at three different levels. First, the pulverized coal combustion in the furnace is calculated and the predicted temperatures in the boiler first pass are compared with the previous measurements. Subsequently, a co-firing scenario is computationally analyzed, where the burners of the lowest level that supply 43% of the total fuel mass are fed by biomass, instead of coal. Turkish red pine is assumed to be the source of the biomass. In replacing the coal by biomass, the mass flow rates of the biomass and the corresponding air are adjusted in such a way that the thermal load and the equivalence ratio remain unaltered. Due to the lack of more accurate data for the biomass, the rate constants for the pyrolysis and chemical conversion of biomass are assumed to be the same as those of coal, along with the assumption of the same particle size distribution for both fuels. It is observed that the resulting flame structure for the case of co-firing is very similar to that of coal combustion. This result is encouraging for the application of biomass co-firing in the considered furnace.

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The Effect of Temperature Distribution on Tube Rupture

Cited by 2 publications

References 29 publications

Primary soot particle distributions in a combustion field of 4 kW pulverized coal jet burner measured by time resolved laser induced incandescence (TiRe-LII)

Primary soot particle distributions in a combustion field of 4 kW pulverized coal jet burner measured by time resolved laser induced incandescence (TiRe-LII)

COMPUTATIONAL ANALYSIS OF PULVERIZED COAL CO-FIRING WITH BIOMASS IN 150MWe UNIT OF TUNCBILEK THERMAL POWER PLANT

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