scholarly journals Repurposing Fly Ash Derived from Biomass Combustion in Fluidized Bed Boilers in Large Energy Power Plants as a Mineral Soil Amendment

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4805 ◽  
Author(s):  
Elżbieta Jarosz-Krzemińska ◽  
Joanna Poluszyńska
Keyword(s):  
Fly Ash ◽  
Nitrogen Content ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Mineral Soil ◽  
Large Energy ◽  
Biomass Combustion ◽  
Mineral Fertilizers ◽  
Fluidized Bed Boilers ◽  
Low Nitrogen

This research involved studying the physico-chemical parameters of fly ash derived from the combustion of 100% biomass in bubbling and circulating fluidized bed boilers of two large energy plants in Poland. Chemical composition revealed that ash contains substantial amounts of CaO (12.86–26.5%); K2O (6.2–8.25%); MgO (2.97–4.06%); P2O5 (2–4.63%); S (1.6–1.83%); and micronutrients such as Mn, Zn, Cu, and Co. The ash from the bubbling fluidized bed (BFB) was richer in potassium, phosphorus, CaO, and micronutrients than the ash from the circulating fluidized bed (CFB) and contained cumulatively less contaminants. However, the BFB ash exceeded the threshold values of Cd to be considered as a liming amendment. Additionally, according to our European Community Bureau of Reference (BCR) study Pb and Cd were more mobile in the BFB than in the CFB ash. Except for a low nitrogen content, the ash met the minimum requirements for mineral fertilizers. Acute phytotoxicity revealed no inhibition of the germination and seed growth of Avena sativa L. and Lepidium sativum plants amended with biomass ash. Despite the fact that low nitrogen content excludes the use of biomass fly ash as a sole mineral fertilizer, it still possesses other favorable properties (a high content of CaO and macronutrients), which warrants further investigation into its potential utilization.

Experimental Study on Microstructure of Fly-Ash from Circulating Fluidized Bed Boilers

2011 ◽  
Vol 354-355 ◽  
pp. 413-416
Author(s):  
Yan Jin ◽  
Cui Ying Feng ◽  
Juan Juan Liu
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Adsorption Isotherms ◽  
Circulating Fluidized Bed ◽  
Nitrogen Adsorption ◽  
Cfb Boiler ◽  
Nitrogen Adsorption Isotherms ◽  
Pore Types ◽  
Adsorption Desorption ◽  
Fluidized Bed Boilers

Circulating fluidized bed (CFB) combustion techniques have been widely used in China. In order to improve CFB boiler performance it is necessary to study on microstructures of fly-ash. With the help of nitrogen adsorption instrument and scanning electron microscopy, the pore structure of fly-ash in circulating fluidized bed boilers are studied by nitrogen adsorption/desorption isotherms of fly-ash, hysteresis loop and pore distribution. The results indicated that different particle sizes of fly-ash in CFB boilers are of similar nitrogen adsorption isotherms, pore types and the pore size distribution, and the most probable pore radius of fly-ash is about 2nm. Adsorption isotherms of fly-ash is the second type, and the macro-porous and meso-porous types are tapered hole, parallel plate slit hole and the ink bottle shape hole. And meso-pore in proportion is the largest. Micro-pores are not discovered in fly-ash from CFB boilers.

scholarly journals Characteristics of Ash from the Combustion of Biomass in Fluidized Bed Boilers

2016 ◽  
Vol 32 (3) ◽  
pp. 149-162 ◽  
Author(s):  
Alicja Uliasz-Bocheńczyk ◽  
Aleksandra Pawluk ◽  
Michał Pyzalski
Keyword(s):  
Fly Ash ◽  
Fluidized Bed ◽  
Ph Value ◽  
Combustion Process ◽  
Power Industry ◽  
Biomass Combustion ◽  
Renewable Sources ◽  
Professional Power ◽  
Fluidized Bed Boilers ◽  
By Products

AbstractWhen it comes to the production of energy from renewable sources, biomass is the main fuel, burned directly or co-fired with coal, used in the professional power industry. As in the case of coal, the use of biomass in the professional power industry is accompanied by the generation of by-products of the combustion process, primarily in the form of fly ash. These wastes significantly differ from those resulting from coal combustion. Their properties depend primarily on the burned biomass and boiler type. Due to the growing pressure on the use of energy from renewable sources resulting from the Energy Policy of Poland and the requirements imposed by the EU, more and more by-products are produced. Ashes from the co-firing of biomass are relatively well studied, especially when it comes to those resulting from the combustion in conventional boilers. The by-products of biomass combustion are of limited economic use due to their specific characteristics. The ashes resulting from the combustion in fluidized bed boilers are particularly problematic. The paper presents the research results on the basic properties of the three ashes generated from the combustion of biomass in fluidized bed boilers and one ash resulting from the co-firing of biomass with coal in pulverized coal boiler for the same biofuel type. The conducted analysis of the chemical composition has shown a high content of CaO and CaOw, SO3, and K2O and a low content of SiO2and Al2O3compared to ash from co-combustion of biomass. The elemental analysis indicates a high content of: P, S, Cl, K, and Ca and lower content of chromium and cobalt in the ashes generated from burning of biomass when compared with the ashes produced as a result of co-combustion. All the tested ashes have similar granulometric composition. Particular attention was paid to the leachability of pollutants, which is one of the most important factors determining the use of waste in mining technologies, using mainly the mixtures of fly ash and solid waste from calcium-based flue gas desulphurization (10 01 82). The pH of leachates from the analyzed ashes is the lowest for the ashes resulting from the co-combustion of biomass. The pH value of leachates was approximately 12 for all of the tested samples. The results have shown a high leachability of potassium and chlorides, which is characteristic for by-products resulting from the combustion of biomass, and a high leachability of sulphates due to the type of used boilers. The phase composition is dominated by calcium and potassium carbonates, quartz, K2SO4, halite, sylvite, CaO, MgO.

Research on Carbon Content in Fly Ash from Circulating Fluidized Bed Boilers

2005 ◽  
Vol 19 (4) ◽  
pp. 1520-1525 ◽  
Author(s):  
Xianbin Xiao ◽  
Hairui Yang ◽  
Hai Zhang ◽  
Junfu Lu ◽  
Guangxi Yue
Keyword(s):  
Fly Ash ◽  
Carbon Content ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Fluidized Bed Boilers

scholarly journals Highly Effective Adsorption Process of Ni(II) Ions with the Use of Sewage Sludge Fly Ash Generated by Circulating Fluidized Bed Combustion (CFBC) Technology

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3106
Author(s):  
Tomasz Kalak ◽  
Kinga Marciszewicz ◽  
Joanna Piepiórka-Stepuk
Keyword(s):  
Fly Ash ◽  
Sewage Sludge ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Fluidized Bed Combustion ◽  
Nickel Ions ◽  
Suitable Material ◽  
Circulating Fluidized Bed Combustion

Recently, more and more attention has been paid to the removal of nickel ions due to their negative effects on the environment and human health. In this research, fly ash obtained as a result of incineration of municipal sewage sludge with the use of circulating fluidized bed combustion (CFBC) technology was used to analyze the possibility of removing Ni(II) ions in adsorption processes. The properties of the material were determined using analytical methods, such as SEM-EDS, XRD, BET, BJH, thermogravimetry, zeta potential, SEM, and FT-IR. Several factors were analyzed, such as adsorbent dose, initial pH, initial concentration, and contact time. As a result of the conducted research, the maximum sorption efficiency was obtained at the level of 99.9%. The kinetics analysis and isotherms showed that the pseudo-second order equation model and the Freundlich isotherm model best suited this process. In conclusion, sewage sludge fly ash may be a suitable material for the effective removal of nickel from wastewater and the improvement of water quality. This research is in line with current trends in the concepts of circular economy and sustainable development.

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