Alkali transformation during single pellet combustion of soft wood and wheat straw

Fagerström, Jonathan; Steinvall, Erik; Boström, Dan; Boman, Christoffer

doi:10.1016/j.fuproc.2015.11.016

Cited by 65 publications

(47 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The sticky layer could capture fly ash and then result in ash deposition [3,4]. Moreover, potassium could also react with sulfur and chlorine species, leading to severe fouling and corrosion [5,6]. It is therefore important to understand potassium-release mechanisms during biomass combustion in order to develop potassium control technologies and achieve better utilization of biomass resources [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Liu

Wan

et al. 2020

Fuel

View full text Add to dashboard Cite

In the present study, two types of biomass were investigated as typical agricultural and woody biomass fuel, i.e., corn straw and poplar. Firstly, laser induced breakdown spectroscopy (LIBS) was employed to investigate the release characteristics of potassium (K) from a burning biomass pellet. In order to further investigate the correlation between K release and the combustion process, combustion parameters including pellet surface temperature and pellet diameter were simultaneously measured with LIBS. A dual-peak trend is observed in the K release history of poplar, but only a single peak is found in that of corn straw. Both biomass samples show the strongest K release during the devolatilization stage in comparison with the subsequent char burnout and ash cooking stages. Similar tendencies are observed between K release and pellet temperature, which suggests that K release is closely related to the combustion process. The K release mechanism can be attributed to temperature rise and therefore breakdown of chemical bonds during combustion. Then the release of different chemical forms of K was investigated by chemical fractionation treatment of the biomass samples. 2 The released amount of H2O-soluble, NH4Ac-soluble and HCl-soluble potassium compounds were obtained. The H2O-soluble potassium is found to be the major released potassium compound. Finally, four kinds of additives (two pure additives, i.e., silica and alumina, and two typical natural mineral additives, i.e., kaolin and mica) were added to the biomass samples to investigate their inhibition effects on K release. The natural sorbent additives show better inhibition effects than the pure ones.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Liu

Wan

et al. 2020

Fuel

View full text Add to dashboard Cite

show abstract

“…One of the most common methods of biomass processing is its direct combustion in special boilers or co-firing with unconventional energy carriers [4][5][6][7][8][9][10][11].The choice of the appropriate technology for biomass burning is strictly dependent on its parameters (chemical composition, ash content, volatiles, moisture, calorific value) and the form of fuel, in which it was previously processed. There are many installations of different power on the market, and among them two main combustion methods should be specified: combustion in bed, layer or stationary pile and combustion of biomass particles suspended or blown directly from the bottom, top or front to the boiler.Fuel can be fed continuously or in the form of disposable portions (non-continuous).In order to burn clean biomass, special boilers and furnaces are most often used, the method of use of which and the efficiency obtained are closely related to the type and quality of the combusted biofuel [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Impact of grinding coconut shell and agglomeration pressure on quality parameters of briquette

Dziedzic

Mudryk

Hutsol

et al. 2018

Engineering for Rural Development

View full text Add to dashboard Cite

Abstract. In Poland, biomass is still considered as the basic source of renewable energy. Energy from biomass accounts for 15 % of global energy consumption, while in developing countries this share is higher. The main advantage of biomass is lower emissions of sulphur dioxide during combustion compared to fossil fuels. The main sources of biomass for production of low-processed solid biofuels, such as bales or chips and high processed pellets or briquettes, are plantations of energy plants. Energy plant species, possible to use as a raw material for the production of biofuels, are plants characterized by a high annual growth, resistance to diseases and pests, small habitat requirements and adaptation to the Polish climatic conditions. The paper presents the physico-chemical properties of coconut shells in terms of their energetic use. The results obtained are: humidity (9.4 %), calorific value (17308.68 J·g -1 ), low ash content (0.66 %) and volatile content (77.7 %) are comparable to those of biofuels available on the market. The work was also carried out to assess the effect of the shredding degree and the applied agglomeration pressure in the briquetting process on the quality characteristics of the obtained briquettes. For briquetting the raw materials the POR ECOMEC Junior Press was used. Tests were conducted for particulate matter on 8 and 12 mm sieves and for agglomerate pressure of 37 and 47 MPa. The obtained results showed that proper granulation of the raw material and application of appropriate agglomeration pressure improve the qualities of the briquettes.

show abstract

“…They found that time for a single pellet combustion increased with pelletizing temperature and time for flame combustion was about 50 s; time for char oxidation was about 100 s [18]. Fagerström et al also measured the weight of the wood pellet during the combustion test using a precision scale to determine the release of ash forming elements after the devolatilization phase and the char combustion [19]. Ström and Thunman developed a numerical model for drying and devolatilization of moist wood particles in an inert condition [20].…”

Section: Introductionmentioning

confidence: 99%

“…Previous studies use a precise electric scale to measure the weight of the burning wood pellet [13,15,18,19]. In this study, we calculate the volume of the burning wood pellet based on the image processing method and we also determine the mass of the burning wood pellet with measured density of the bare wood pellet and the charcoal of the wood pellet.…”

Section: Introductionmentioning

confidence: 99%

Volume and Mass Measurement of a Burning Wood Pellet by Image Processing

2017

View full text Add to dashboard Cite

Wood pellets are a form of solid biomass energy and a renewable energy source. In 2015, the new and renewable energy (NRE) portion of wood pellets was 4.6% of the total primary energy in Korea. Wood pellets account for 6.2% of renewable energy consumption in Korea, the equivalent of 824,000 TOE (ton of oil equivalent, 10 million kcal). The burning phases of a wood pellet can be classified into three modes: (1) gasification; (2) flame burning and (3) charcoal burning. At each wood pellet burning mode, the volume and weight of the burning wood pellet can drastically change; these parameters are important to understand the wood pellet burning mechanism. We developed a new method for measuring the volume of a burning wood pellet that involves no contact. To measure the volume of a wood pellet, we take pictures of the wood pellet in each burning mode. The volume of a burning wood pellet can then be calculated by image processing. The difference between the calculation method using image processing and the direct measurement of a burning wood pellet in gasification mode is less than 8.8%. In gasification mode in this research, mass reduction of the wood pellet is 37% and volume reduction of the wood pellet is 7%. Whereas in charcoal burning mode, mass reduction of the wood pellet is 10% and volume reduction of the wood pellet is 41%. By measuring volume using image processing, continuous and non-interruptive volume measurements for various solid fuels are possible and can provide more detailed information for CFD (computational fluid dynamics) analysis.

show abstract

Alkali transformation during single pellet combustion of soft wood and wheat straw

Cited by 65 publications

References 32 publications

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Experimental study of potassium release during biomass-pellet combustion and its interaction with inhibitive additives

Impact of grinding coconut shell and agglomeration pressure on quality parameters of briquette

Volume and Mass Measurement of a Burning Wood Pellet by Image Processing

Contact Info

Product

Resources

About