Effect of the torrefaction on the emission of PM10 from combustion of rice husk and its blends with a lignite

Han, Jingkun; Yu, Dunxi; Yu, Xin; Liu, Fangqi; Wu, Jianhui; Zeng, Xianpeng; Yu, Ge; Xu, Minghou

doi:10.1016/j.proci.2018.07.011

Cited by 34 publications

(23 citation statements)

References 28 publications

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“…At another instant, Wang et al, 16 reported the reduction in PM1 emissions upon the co-firing of the char and bituminous coal. Han et al, 17 also found a similar observation with torrified char and explained the reason behind the reduction of PM1 emission is the increment of PM1-10 emissions. In another study, char helped in improved combustion and lower burnout temperature at several percentage blends with coal.…”

Section: Introductionsupporting

confidence: 54%

Improving the Stability of Wastewater Derived Microalgae Carbon Materials: Products Characterization, and Kinetic Modelling

Ali¹,

Jiříček²,

Mehrabadi³

et al. 2019

Preprint

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<p>Microalgae-derived char contains low stability and heating values with relatively high nitrogen content than lignocellulosic char. This study showed that co-pyrolysis helped improve the overall properties of char than individual pyrolysis of these feedstocks. Two batches of experiments were conducted (a) single step pyrolysis and (b) two-step pyrolysis in the range of highest treatment temperature of 400 – 600 °C. Single step pyrolysed char showed, lower aromaticity, higher yield, ash content and heating values of the char than two-step pyrolysed char. Similarly, ignition temperature and activation energy were higher during combustion by single step pyrolysed char than two-step char. Hence, two-step pyrolysed char is suitable in the energy applications, and low-temperature processing (400 – 500 °C) will result in optimum properties in terms of yield and heating values. </p>

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Section: Introductionsupporting

confidence: 54%

Improving the Stability of Wastewater Derived Microalgae Carbon Materials: Products Characterization, and Kinetic Modelling

Ali¹,

Jiříček²,

Mehrabadi³

et al. 2019

Preprint

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“…This result is consistent in comparison with the data in Table 1. In order to reduce emissions of CO 2 and SOx due to the low sulfur content and neutral carbon in the RH-torrefied products, their applications for co-firing with pulverized coal exist in boilers [31]. Furthermore, co-firing Si-rich torrefied RH with low-rank (high Na/Ca/Cl) coal can lead to lower emissions of particulate matter (PM) and released elements such as Cl and Na [52].…”

Section: Organic Elemental Values Of Rh-torrefied Productsmentioning

confidence: 99%

“…Regarding the torrefaction of rice husk at higher temperatures (> 300 °C), few studies have been reported in the literature [25][26][27][28][29][30][31][32][33]. Wang et al used microwave irradiation to induce torrefaction with an increase in its caloric value by 26% under proper processing time [25].…”

Section: Introductionmentioning

confidence: 99%

“…Aslam et al performed the torrefaction experiments at 200-300 °C for 10-150 min for improving its fuel characteristics [30]. Han et al studied the production of torrefied products at 270 °C for 30 min for evaluating the emissions of particulate matter during the cofiring of lignite [31]. Qi et al correlated the thermochemical properties of torrefied products produced at 180-330 °C for 20 min based on the gray-scale analysis [32].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of thermochemical properties on rice husk under a wide range of torrefaction conditions

Tsai

Jiang

Tang

et al. 2021

Biomass Conv. Bioref.

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In the present study, local biomass rick husk (RH) was torrefied by an electronic furnace for improving its thermochemical properties under a wide range of torrefaction temperature (i.e., 240, 280, 320, and 360 °C) and residence time (i.e., 0, 30, 60, and 90 min). In comparison with the thermochemical properties of the starting feedstock, the torrefaction temperature at around 360 °C for residence time of 0 min would be optimal to produce the RH-torrefied product. The calorific value can be raised by 41.2%, increasing from 13.96 to 19.71 MJ/kg. Based on the calorific values of the RH-torrefied products, it was found that torrefaction temperature and residence time are important parameters affecting their fuel properties and applications in solid biofuels. Consistently, their calorific values and carbon-to-hydrogen ratios generally increased at higher torrefaction temperatures for longer residence times. In contrast, the energy yield decreased with an increase in torrefaction temperatures and residence time. These findings also supported the thermal decomposition mechanism of the lignocellulosic biomass by the thermogravimetric analysis (TGA). Using the van Krevelen diagram for all RH-torrefied products as compared to various coals, it showed that several torrefied solids belong to the characteristics of lignite-like coal. However, the RH-torrefied biomass would not be appropriate to be directly reused as an auxiliary fuel in boilers because of the high content of silica (SiO 2 ).

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“…18−22 Their main conclusions include the following: (1) co-firing rice husk with coal can improve coal ignition 22 and reduce fine particulate matter formation; 21 (2) rice husk has a low fouling 20 and slagging 18 tendency; and (3) torrefied rice husk generates less sub-micrometer particles (PM 1 ) than raw rice husk. 19 Branco and Costa burned rice husks in a DTF and discovered that burnout was improved at a smaller rice husk particle size and no particle fragmentation was observed. 23 However, Zeng et al observed the fragmentation for rice husk combustion in another work, which was also conducted in a DTF.…”

Section: Introductionmentioning

confidence: 99%

Comparison Study of Ash Partitioning and Deposition Behavior between Two Rice Husk Fuels under a 100 kW Combustor

Wang

et al. 2019

Energy Fuels

Self Cite

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Utilization of biomass when combined with carbon capture and sequestration (CCS) is one feasible solution for "bioenergy with carbon capture and storage" (BECCS), which can reduce the CO 2 emissions in the atmosphere. Rice husk is a unique biomass resource because its ash content is typically higher than 15% and more than 88% of this mineral matter is composed of silica. Ash partitioning and deposition mechanisms in rice husk combustion are still under investigation and will be the focus of this paper. Two different rice husk resources were tested in this work: one is from China, and another is from the United States, which are abbreviated as RH_CN and RH_US, respectively. The experimental work was performed in a 100 kW down-fired oxy-fuel combustor (OFC), and both fuels were co-fired with natural gas to achieve combustion conditions that are comparable to coal combustion. Two conditions were tested: (1) air combustion and (2) oxy-combustion with 70% O 2 and 30% CO 2 in oxidant gas (denoted as OXY70). Results suggested that similar sub-micrometer accumulation modes and supermicrometer fragmentation modes appeared for both rice husks. Although the composition of super-micrometer particles was similar and enriched in silica for both rice husks, the sub-micrometer particles from RH_CN are mainly composed of volatile elements (K, Na, Cl, and P), while these from RH_US are mainly composed of Si. This compositional difference in submicrometer aerosols subsequently affects the ash deposit formation; for example, the tightly bound inside deposits from RH_CN have much more volatile elements than those from RH_US. More importantly, apparent ash shedding on deposits occurred after 0.5 h for RH_CN, but this cannot be observed in RH_US until the maximum sampling time (2 h).

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Effect of the torrefaction on the emission of PM10 from combustion of rice husk and its blends with a lignite

Cited by 34 publications

References 28 publications

Improving the Stability of Wastewater Derived Microalgae Carbon Materials: Products Characterization, and Kinetic Modelling

Improving the Stability of Wastewater Derived Microalgae Carbon Materials: Products Characterization, and Kinetic Modelling

Enhancement of thermochemical properties on rice husk under a wide range of torrefaction conditions

Comparison Study of Ash Partitioning and Deposition Behavior between Two Rice Husk Fuels under a 100 kW Combustor

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