Effectiveness of different additives on slagging and fouling tendencies of blended coal

Hariana, Hariana; Prismantoko, Adi; Prabowo,; Hilmawan, Edi; Darmawan, Arif; Aziz, Muhammad

doi:10.1016/j.joei.2023.101192

Cited by 22 publications

(3 citation statements)

References 72 publications

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“…Using fuel additives that have varied chemical compositions is an effective strategy for lessening and offsetting the negative impacts observed in combustion processes. Such additives aid in the establishment of new chemical bonds, thereby converting problematic elements responsible for ash formation into stable materials possessing high melting points [21,22]. Since the use of fuel additives is related to economic factors, it is very important to determine what amount of additive would be sufficient to solve the desired problems.…”

Section: Introductionmentioning

confidence: 99%

Performance of Corn Cob Combustion in a Low-Temperature Fluidized Bed

Paulauskas,

Praspaliauskas,

Ambrazevičius

et al. 2024

Energies

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This study investigates the combustion of agricultural biomass rich in alkali elements in the fluidized bed. The experiments were performed with smashed corn cob in a 500 kW fluidized bed combustor which was designed for work under low bed temperatures (650–700 °C). During the experiments, the formed compounds from corn cob combustion were measured by sampling particulate matter, and mineral compositions were determined. Also, the temperature profile of the FBC was established. It was determined that the emissions of K and Na elements from the FBC increased from 4 to 7.3% and from 1.69 to 3%, respectively, changing the bed temperature from 650 to 700 °C. Though alkali emissions are reduced at a 650 °C bed temperature, CO emissions are higher by about 50% compared to the case of 700 °C. The addition of 3% of dolomite reduced the pollutant emissions and alkali emissions as well. Potassium content decreased by about 1% and 4%, respectively, at the bed temperatures of 650 °C and 700 °C. The NOx emissions were less than 300 mg/m3 and did not exceed the limit for medium plants regarding DIRECTIVE (EU) 2015/2193. During extended experiments lasting 8 h, no agglomeration of the fluidized bed was observed. Moreover, the proposed configuration of the FBC and its operational parameters prove suitable for facilitating the efficient combustion of agricultural biomass.

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Section: Introductionmentioning

confidence: 99%

Performance of Corn Cob Combustion in a Low-Temperature Fluidized Bed

Paulauskas,

Praspaliauskas,

Ambrazevičius

et al. 2024

Energies

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“…Li et al [19] discussed the effect of various additives on K xation during wheat straw combustion, with ammonia dihydrogen sulfate being the most effective, and both K-Al/Fe silicates and K-Ca/Mg phosphates promoting the xation effect. Hariana et al [20] investigated the effect of different additives on slagging and fouling under low-grade coal combustion conditions and found that the addition of silica-aluminabased, aluminum-based, and magnesium-based additives could generate high melting point minerals such as sodium feldspar to increase the ash melting point and reduce the risk of slagging. The above study pointed out that the addition of silica-alumina-based additives is an effective means of xing alkali metals, but there is limited research on the alkali metal xation mechanism and ash melting characteristics of CG as such additives for biomass.…”

Section: Introductionmentioning

confidence: 99%

Study on the co-combustion behavior of rice straw with coal gangue and fixation of alkali metals and ash melting characteristics

Jia,

Zhang,

Yun

et al. 2024

Preprint

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Because it is clean, low carbon, and renewable, biomass offers the greatest practical value. Nevertheless, during combustion, issues like slagging, agglomeration, and corrosion can occur due to the high concentration of Cl and alkali metals (K and Na), which lowers combustion efficiency. On the other hand, gangue (CG), when combined with biomass as an additive, can successfully prevent slagging during the burning process. However, more research is needed to determine how CG affects the properties of ash melting, alkali metal immobilization, and biomass combustion behavior. Thus, the impacts of CG on the co-combustion behavior, fugitive forms of alkali metals, and ash melting properties of rice straw (RS) were examined in this article. X-ray diffraction analysis, scanning electron microscopy, thermogravimetric-differential thermal analysis, ash melting temperature test, and tube furnace combustion studies were among the experimental techniques utilized to characterize the ash. The findings demonstrated that adding CG to biomass might enhance both the overall combustion performance and the flammability index, with notable synergistic effects connected to the ratio of biomass to CG. Alkali metals in the ash could be efficiently fixed by CG, and it was found that adding 20% of CG to the biomass had the best results. The degree of ash melt slagging was successfully reduced and controlled with a rise in the CG addition ratio, and silica-aluminate with a higher melting point and stable nature was produced, which could effectively raise the biomass's ash melting temperature.

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“…Most technologies are aimed at fuel adjustment, such as co-firing [11,12], which is the most widely used method, adding additives [13], and extracting alkali metal [5]. Adjusting the boiler structure is another approach.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study and Hydrodynamic Calculation of the Feasibility of Retrofitting Tangentially Fired Boilers into Slag-Tap Boilers

Guo,

Yang,

Zhao

et al. 2023

Processes

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Retrofitting a tangentially fired boiler into a slag-tap boiler offers a solution for fully burning high-alkali coal in power plant boilers. Numerical simulation and hydrodynamic calculation of such a retrofit scheme were performed in this study. The maximum temperature in the furnace after retrofitting is 2306.8 K, surpassing the pre-retrofit temperature of 2095.8 K. The average temperature in the combustion chamber of the slag-tap boiler is 2080.3 K, which ensures that the slag can be discharged in a molten state. When the coal consumption is halved relative to the working condition of the boiler maximum continuous rating (BMCR) in the slag-tap boiler, the maximum temperature in the combustion chamber decreases from 2306.8 to 2220.3 K. However, the temperature distribution remains relatively uniform, ensuring that the slag discharge is not disrupted. In both of the working conditions calculated in this study, the fluid flow rates in the water-cold wall are positively correlated with the wall heat fluxes. The maximum wall temperatures under the two working conditions are 653.9 and 590.6 K, respectively, both of which are well within the safe limits for the wall material. The results illustrate the feasibility of the retrofit scheme.

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Effectiveness of different additives on slagging and fouling tendencies of blended coal

Cited by 22 publications

References 72 publications

Performance of Corn Cob Combustion in a Low-Temperature Fluidized Bed

Performance of Corn Cob Combustion in a Low-Temperature Fluidized Bed

Study on the co-combustion behavior of rice straw with coal gangue and fixation of alkali metals and ash melting characteristics

Numerical Study and Hydrodynamic Calculation of the Feasibility of Retrofitting Tangentially Fired Boilers into Slag-Tap Boilers

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