In-situ monitoring of the transformation of ash upon heating and the prediction of ash fusion behaviour of coal/biomass blends

Oladejo, Jumoke; Adegbite, Stephen; Pang, Cheng Heng; Liu, Hao; Lester, Edward; Wu, Tao

doi:10.1016/j.energy.2020.117330

Cited by 49 publications

(19 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported, the transformation and emission characteristics of PM during the co-combustion of coal and sewage sludge, − coal and MSW, ,, and coal and biomass ,− have been widely studied in the past few years. Ninomiya et al found the evolution of particles during co-combustion was dominated by the interactions among minerals inside OSW and coal.…”

Section: Air Pollutant Emissions During Co-combustionmentioning

confidence: 99%

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

et al. 2020

View full text Add to dashboard Cite

Increasing economy and population result in the rapid growth of solid waste in China, with more than 70% being carbonaceous components. The generated carbon-bearing solid waste is called as organic solid waste (OSW). In this Review, OSWs from both municipal and industrial sources are discussed and divided into municipal solid waste (MSW), organic sludge, polymer solid waste, and biomass-like solid waste, according to their variations in origins and characteristics in China. Agricultural waste (i.e., biomass) and large-scale industrial solid waste (e.g., coal waste) are not considered, because of their well-established fundamentals. Incineration is becoming the most common method of energy recovery for OSW in China, while it has to face the problems of relatively low thermal efficiency, high air pollutant emission, and the high risk of fly ash products. Compared with MSW incinerators, coal-fired power plants own efficient power generation systems and centralized air pollution control devices (APCDs). With the fact that mixed coals are widely used in existing power plants, it is of great significance to study and discuss the current status of cocombustion of OSW and coal in China. In this work, the physicochemical properties of OSW were first introduced, with a subsequent detailed summary on their co-combustion fundamentals, such as devolatilization, ignition, char reactivity, and combustion efficiency, and ash-related issues, including fouling/slagging, high-temperature corrosion, and leaching behavior of ash residue. Furthermore, pollutants emissions regarding conventional pollutant [CO, SO 2 , NO x , HCl, particulate matters (PM)], heavy metals, and hazardous organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were analyzed. Some pretreatment methods to reduce the risk of co-combustion were also discussed, including pelletization, drying, torrefaction, hydrothermal carbonization, and low-temperature pyrolysis. Lastly, discussions and perspectives on the future co-combustion technology of OSW with coal were presented. This work aimed to gain systematic knowledge on the co-combustion technology of OSW and coal, providing guidelines for further applications of OSW in power plants in China, as well as other countries in the world.

show abstract

Section: Air Pollutant Emissions During Co-combustionmentioning

confidence: 99%

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

et al. 2020

View full text Add to dashboard Cite

show abstract

“…T emp (“excessive melting point,” and in our case, T emp = 933 °C) expresses the temperature where the excessive melting starts. The expansion in region 3 could be attributed to several effects such as the thermal expansion of ash particles and primary pores trapping air in the ash particle as well as the evolution of gases during the decomposition of ash components. , Region 4 shows the last step of the ash melting process; the fluctuations (seen as noise or oscillations in the plot) in height are the result of bubbling.…”

Section: Results and Discussionmentioning

confidence: 99%

“…In addition, ashes originating from mixtures of several parent fuels have shown a complex melting behavior depending on the mineral composition. Therefore, knowing the impact of a certain blend on the properties of the final ash enables us to avoid fuel combinations with unwanted properties or even to design an ash material for a certain application. − A number of studies have focused on the behavior of ash melting of biomass-to-biomass or biomass-to-coal blends. − …”

Section: Introductionmentioning

confidence: 99%

Characterization of Ash Melting of Reed and Wheat Straw Blend

et al. 2022

View full text Add to dashboard Cite

Ash melting could cause severe problems in boiler operation, such as agglomeration of the fluidized bed. Our previous work has shown that the ash melting behavior of the blend of reed and wheat straw is complex and needs further investigation. The ash melting behavior was studied using different laboratory methods such as simultaneous thermal analysis, heating microscope, scanning electron microscopy with energy dispersive X-ray (SEM/EDX) analysis, and X-ray diffraction (XRD). In the thermodynamic modeling, we used FactSage software, which supplements well the results obtained by other methods and vice versa. The results indicated that melting started at 660−680 °C when Na and K salts were melted and molten K 2 SO 4 covered the ash material; the content of liquid mass fraction was 13.8%, revealing that the studied ash blend could already be sticky at 680 °C. Intensive melting took place in the temperature range of 800− 980 °C. The rapid melting between 950 and 980 °C was caused by the melting of SiO 2 and K 2 MgSi 5 O 12 ; the ash material became glassy and amorphous. We propose an alternative distribution of ash melting stages for the studied blend.

show abstract

“…Although technological improvements such as carbon capture and storage and/or utilization can significantly reduce carbon emissions from coal-fired power plants, at present they are very expensive; however, co-firing biomass with coal provides a cheaper and much easier method to implement. 8,9 Biomass is considered as a carbon neutral and renewable fuel, since it generates the same amount of carbon dioxide that takes from atmosphere during its growing up. 10,11 It has the capacity to make significant contributions to mitigating a climate change, when sustainable biomass management practices and certification are conducted.…”

Section: Introductionmentioning

confidence: 99%

“…27 Oladejo et al conducted in-situ monitoring of the impacts of biomass blending and temperature on the morphology of coal ash, and provided a method to guide the selection of biomass to adjust fusion characteristics of fuel blends. 9 These previous researches about co-combustion characteristics and experimental correlations have enriched the theoretical and practical basis on co-firing biomass with coal.…”

Section: Introductionmentioning

confidence: 99%

Stackelberg game based co-firing biomass with coal under carbon cap-and-trade regulation

Xie

Liu

2021

Energy & Environment

View full text Add to dashboard Cite

Coal-fired power industry is under enormous pressure to accomplish carbon emission reduction targets. This paper proposes a bi-level multi-objective model for co-firing biomass with coal under carbon cap-and-trade regulation which considers a leader-follower Stackelberg game between the authority and the coal-fired power plants. The upper level regards social welfare maximization and allocation satisfaction maximization as its multiple objectives, while the lower level attempts to maximize the profits of each coal-fired power plant. The inherent uncertainty prompts the motivation for employing fuzzy set theory to characterize the uncertain parameters and determine their exact values. A case study from Shandong Province, China is provided to demonstrate the practicality and efficiency of the optimization model. [Formula: see text]-constraint method and interactive algorithm are used to solve the model, and furthermore the solutions associated with different free carbon emission quota levels and minimal allocation satisfactions have been generated to examine the influences. Based on the analysis and discussion, the methodology can meet the carbon emission reduction goals and transit to a lower-carbon power generation. It also assists the decision makers to develop desired quota allocation strategy in accordance with their attitudes and actual conditions.

show abstract

In-situ monitoring of the transformation of ash upon heating and the prediction of ash fusion behaviour of coal/biomass blends

Cited by 49 publications

References 27 publications

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

Review on the Current Status of the Co-combustion Technology of Organic Solid Waste (OSW) and Coal in China

Characterization of Ash Melting of Reed and Wheat Straw Blend

Stackelberg game based co-firing biomass with coal under carbon cap-and-trade regulation

Contact Info

Product

Resources

About