Low temperature ignition of biomass

Jones, James C. Peyton; Saddawi, A.; Dooley, Ben; Mitchell, Edward John; Werner, Jeffrey J.; Waldron, Diana; Weatherstone, Susan; Williams, Alan

doi:10.1016/j.fuproc.2015.02.019

Cited by 93 publications

(59 citation statements)

References 13 publications

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“…The minimum ignition temperature of biomass dust layers and their blends are given in Table 5 together with the corresponding ignition delay times. There is an inverse relationship between minimum ignition temperature and ignition delay as seen by Jones et al 8 in their study where low temperature ignition of biomass was the focus. Consistent with the TMWL values obtained from the TGA/DTG measurements, pine is less reactive than miscanthus and there is a difference of 40 o C in the minimum ignition temperatures.…”

Section: Determination Of Ignition Characteristics Of Solid Biomass Dmentioning

confidence: 86%

“…Hence, the single oxidation temperature used by Ramirez et al (Tcharac) was replaced in this study by the temperature of the maximum rate of weight loss temperature (TMWL) in air stream. As discussed in the study on low temperature ignition of biomass by Jones et al 8 , a single peak, Tcharac, was not observed in TGA studies under oxygen. The apparent first order activation energy, Ea, was calculated from the TGA weight loss curve and this parameter was also used in the risk ranking method.…”

Section: Solid Fuel Characterization -Proximate Analysis Reaction Ramentioning

confidence: 87%

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Ignition Risks of Biomass Dust on Hot Surfaces

et al. 2016

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Combustible biomass dusts are formed at various handling stages and accumulations of these dusts can occur on hot surfaces of electrical and mechanical devices and can pose fire risks. This study evaluates the ignition characteristics of dust from two types of biomass commonly used in the U.K. power stations -herbaceous miscanthus and woody pine. The ignition risks of the individual biomass and their blends in two different weight ratios -90wt% pine to 10wt% miscanthus and 50wt% pine to 50wt% miscanthus were investigated. Biomass-biomass blends represent the power plants scenario where a number of biomass are fired under daily operation and thus, dust sedimentation could consist of material blends. The influence of washing pre-treatment (particularly to remove catalytic potassium) on the ignition behavior of these dusts was investigated. Fuel characterization via proximate and ultimate analyses was performed on all fuels and combustion characteristics via thermogravimetric analysis (TGA). The risk of self-ignition propensity of both untreated and washed biomass were ranked graphically by utilizing the activation energy (Ea) for combustion and the temperature of maximum 2 weight loss (TMWL) determined from the derivative TGA (DTG) curve. It was found that the TMWL and Ea of washed biomass were higher than those of the untreated biomass, implying a lower self-ignition risk. Similar analyses were done on untreated and washed blends and comparable results were observed. The ignition characteristics were studied following the British Standard test methods for determining the minimum ignition temperature of a 5-mm dust layer on a heated surface. It was found that the washed individual biomass and their blends revealed slightly higher dust ignition temperatures than their respective untreated counterparts; a 20 o C and 10 o C difference for individual biomass and blends respectively. The effect of washing on ignition delay time was more obvious for pine than for miscanthus, but the time difference between the untreated and washed biomass never exceed four minutes for all biomass and blends. The biomass pre-treatment method of washing did change the combustion and self-ignition characteristics of biomass dust, and there was evidence of potassium being leached from the fuels upon washing (particularly miscanthus). This is considered the main reason for the increase in minimum ignition temperature. While the washed biomass is found to have a lower ignition risk, it should be noted that the result (validated for up to 5 mm thickness) is not significant enough to influence plant operations for the ignition risk from thin dust layers according to the National Fire Protection Association (NFPA) Standards.

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Section: Determination Of Ignition Characteristics Of Solid Biomass Dmentioning

confidence: 86%

Section: Solid Fuel Characterization -Proximate Analysis Reaction Ramentioning

confidence: 87%

Ignition Risks of Biomass Dust on Hot Surfaces

et al. 2016

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“…The results of the experimental studies of the ignition of the wood particles of two groups have been given: large d up to 3 mm, and small~210 mm in Ref. [22]. The large particles have been cubes (3 Â 3x3 mm) based on an olive tree or pine, or Miscanthus needles (3 Â 3 mm).…”

Section: A Brief Review Of the Experimental Studies Of The Wood Partimentioning

confidence: 99%

“…As a result, the ignition delay times have been determined. The ambient temperature (Tg) has been varied [22] in the range from 490 to 670 K. In this case, the main task of the study [22] has been to determine the minimum Tg value sufficient for igniting wood. The effect of the particle form on the ignition characteristics has not been studied.…”

Section: A Brief Review Of the Experimental Studies Of The Wood Partimentioning

confidence: 99%

In vitro Effects of a Novel Silver-based Complex on Influenza Virus

Silnikov¹,

Plotnikov

2018

Journal of Pharmacology and Pharmacotherapeutics

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The results of the experimental and theoretical studies of the processes of the single particles ignition of the wood biomass of various forms (a cube, a cylinder and a sphere) have been presented. According to the results of the experimental studies, it has been established that the particles form can have a fairly significant effect on the characteristics and conditions of ignition. It has been shown that the wood particles in the form of a sphere are ignited much faster than cylindrical and cubic ones (ignition delay times are less by 56%). Such a tendency is maintained for particles sizes from 1 $ 10 À3 m to 3 $ 10 À3 m. According to the results of the experiments, the mathematical model for ignition of a particle of wet wood biomass has been formulated, taking into account the joint occurrence of the main processes of the thermal preparation (radiation-convective particle heating, evaporation of water, thermal decomposition of the organic part of the fuel, output, ignition and combustion of gaseous pyrolysis products, ignition of the char residue). The formulated system of the nonlinear differential equations in the partial derivatives with the corresponding boundary conditions describes the ignition process in a two-dimensional setting, taking into account the substantial nonuniformity of the temperature field of a wood particle in the induction period. We have taken into account that the evaporation process takes place in the front. Up to the present time, the mathematical models of such a degree of detailing of the physical processes occurring together when igniting wet wood have not been formulated. A comparative analysis of the ignition delay times (t ign) obtained theoretically and experimentally has showed their satisfactory correspondence. As a result of the numerical simulation, the temperature fields in the system "a fuel particle d hightemperature medium" have been obtained, illustrating the high gradients of the temperatures at the moment of ignition. It has been established that it is possible to ignite the water-saturated wood particles before they dry completely. It has been established that the ignition mode of wood particles is possible before they dry completely.

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“…Then, the TG curve tangent at point B intersects with the horizontal line of weight loss beginning at point C. The corresponding temperature at point C is defined as the ignition temperature (point D). Figure 5 demonstrates the method (Jones et al 2015). …”

Section: Computational Analysis Of Comprehensive Combusting Charactermentioning

confidence: 99%

Properties and Combustion Characteristics of Molded Solid Fuel Particles Prepared by Pyrolytic Gasification or Sawdust Carbonized Carbon

et al. 2015

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a Pyrolytic gasified charcoal (PGC) and tar are the solid and liquid products, respectively, yielded from biomass gasification technology. In this paper, PGC was molded with adhesives to prepare molded solid fuel (MSF). Tar and PGC were obtained from the pyrolytic gasification of wood chips and sawdust from pine and cedarwood. PGC was molded with phenol resin prepared by wood tar to prepare MSF (MSF-MP). Meanwhile, there were two other methods used to prepare MSF. PGC molded with common phenol resin was one method (MSF-P). PGC was molded with starch adhesive to prepare MSF-S. Wood powder carbonized carbon (WPCC) obtained from the marketplace was employed as a trial sample. The properties and combustion characteristics of MSFs and WPCC were studied. It was found that the shatter strength of these MSFs were more than 95%. MSFs had higher activation energy and comprehensive combustion index compared to WPCC. MSF-MP yielded the following data: shatter strength: 95.86%, lower heating value (LHV): 25.89 MJ•kg . The LHV and activation energy of MSF-MP were superior to those of other MSFs. Therefore, MSF-MP has a market potential for use as barbecue charcoal in restaurant or family gatherings. The preparation of MSF-MP is a prospective method for the utilization of PGC and wood tar.

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Low temperature ignition of biomass

Cited by 93 publications

References 13 publications

Ignition Risks of Biomass Dust on Hot Surfaces

Ignition Risks of Biomass Dust on Hot Surfaces

In vitro Effects of a Novel Silver-based Complex on Influenza Virus

Properties and Combustion Characteristics of Molded Solid Fuel Particles Prepared by Pyrolytic Gasification or Sawdust Carbonized Carbon

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