L. Lu, ... V. Sahajwalla, in The Coal Handbook: Towards Cleaner Production: Coal Utilisation, 2013. Total ash is a measure of the mineral oxide content of activated carbon on a weight basis. It has to be considered that their compacting can require higher stamping energy insert. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Figure 4. Slide the cover plate across the top ensuring no air bubbles are trapped. (1999) for attrition of sand in a fluidized bed with a single high-velocity nozzle. Dry the outside and weigh the gas jar, cover plate and contents to the nearest 0.1 g. The dry weight of the material is determined as part of the Pressure Filter test (W9) (see above). Liu et al. froth flotation) and (2) differences in the density of the minerals and organic matter. The relative coal cake density results to be expressed by Eq. Vanadium can be neutralized during combustion in IC engines by the use of chemical inhibitors (such as magnesium or silicon). Ash is the residue after combustion. b a list, printed at the front of a book, of chapters or divisions together with the number of the first page of each. Properties are influenced by the type and amount of filler as shown in Fig. The ISO mandates ash content determination for most foodstuffs. Simultaneous injection of pulverised coal and dolomite was studied in an attempt to reduce the melting point and viscosity of pulverised coal and coke ash and to reduce the silicon content of the molten metal (Yamagata et al., 1990). In particular, Fig. 4 shows that independently from the specific volcanic eruption, fresh particles emitted correspond to a lidar ratio at 532 nm around 50 sr (between 45 and 60 sr), and particle depolarization ratio around 35%, but with more variability in values compared to the lidar ratio. This results in increased water and carbon dioxide and reduced organic yields. M1 is the mass of the gas jar, water, slurry and cover plate. A crucible can be used to determine the percentage of ash contained in an otherwise burnable sample of material such as coal, wood, oil, rubber or plastics. Ash definition, the powdery residue of matter that remains after burning. Definitions by the largest Idiom Dictionary. Ash is one of the components in the proximate analysis of biological materials, consisting mainly of salty, inorganic constituents. AC as abbreviation means "Ash Content" Online search. Ash content is a means by which flour is graded in countries such as France, Germany, Italy and Switzerland. https://en.wikipedia.org/w/index.php?title=Ash_(analytical_chemistry)&oldid=979645735, Articles with unsourced statements from September 2020, Creative Commons Attribution-ShareAlike License, crucible (or similar porcelain or metal dishes), This page was last edited on 21 September 2020, at 22:46. Alumina affects the slag fluidity, while silica in the ash has a strong impact on the silicon content of hot metal. Because of the higher density of mineral matter in the coal, stamping coals with higher ash content should result in a higher cake density. It measures how much of the entire wheat kernel is in the flour. Most fillers are stable at temperature well above that and remains as residue or ash as the polymer burns off. At the same time, the dry coke rate would have to increase from 382 to 384 kg/t-hot metal to maintain constant hot metal quality. The ratio of sodium (Na) to vanadium (V) in fuel oil greatly influences the melting point and thereby the corrosive and slagging effect. It can be seen that the amount of ash and its make-up are variable, but are within the range observed for petroleum-based calcined cokes. The sodium content of fuel oil causes bonding of ash constituents on boiler superheater surfaces. Figure 1.6. In analytical chemistry, ashing or ash content determination is the process of mineralization for preconcentration of trace substances prior to a chemical analysis,[1] such as chromatography, or optical analysis, such as spectroscopy. Calculate the mean and range of each set of five results at both the 0 per cent pfa and 80 per cent pfa content. Table 21 reports the ash content and ash composition (determined by inductively coupled plasma-atomic emission spectroscopy, ICP-AES) for all of the calcined cokes used to fabricate the test graphites. Transfer the dry cementitious material from the filter paper into the gas jar and continue as described below. Ash refers to the inorganic residue remaining after either ignition or complete oxidation of organic matter in a food sample. The ash content of pulverised coal lowers the carbon content and calorific value of the coal injected and requires additional fluxes to remove this material as slag, both of which affect the heat balance of the blast furnace, potentially leading to an increase in fuel rate and a decrease in productivity. The pfa content of the fresh concrete mix can be determined by a chemical method, as in Appendix of BS 6610, Pozzolanic cement with pulverized-fuel ash as pozzolan, or the Particle Density Method described below. Many translated example sentences containing "ash content" – Dutch-English dictionary and search engine for Dutch translations. ASH CONTENT OF PET FOOD AND URINARY PROBLEMS IN DOGS AND CATS. (2009) and Zhou et al. This information should not be considered complete, up to date, and is not intended to be used in place of a visit, consultation, or advice of a … The ash content of a fuel is a measure of the amount of inorganic noncombustible material it contains. Formation of high melting point material just out-side the raceway leads to inactiveness of the deadman. This residue consists of oxides and salts containing anions such as phosphates, chlorides, sulfates, and other halides and cations such as sodium, potassium, calcium, magnesium, iron, and manganese. Content Portfolio. The ash content of a fuel is a measure of the amount of inorganic noncombustible material it contains. An increase in vitrinite content is generally believed to be beneficial in the case of direct liquefaction conversions. Although the total liquid remains about the same, the water content is much higher possibly resulting in phase separation and the heating value is lower due to the higher water content. Using chelated minerals therefore results in a pet food with a lower ash content. Fragmentation was mostly localized close to the surface of the particles since in this zone significant compressive stresses may establish upon rapid heating. This aspect is addressed in the next section. 2 a : the solid residue left when combustible material is thoroughly burned or is oxidized by chemical means. It cannot identify individual percentages in multi-filled materials without additional test procedures being performed. Citations. The particle density is calculated from the dry and wet weights of the material recovered from the cement content test. Scope: An Ash test is used to determine if a material is filled. The extent of attrition also increased with nozzle gas velocity. Fill a gas jar (Figure 1.6) with water until a convex meniscus forms at the brim. The thick shield prevents heat transfer that in turn reduces the efficiency of boiler. Fig. 4 reports an overview of the values observed for different volcanoes as a function of the time elapsed for covering the source–station distance. These salts may be compounds of sodium, vanadium, aluminium, nickel, calcium, magnesium, silicon, iron, etc. Ash comes from the nutrients in the biomass, of which potassium is particularly important, and from soil and related contamination introduced in growing and harvesting. Van Nierop (1988) has indicated that the vitrinite content of the float obtained during density separation, increased when compared to that of the original coal. After waiting at least one minute for the slurry to partially settle in the jar gently top up the gas jar with water to a point where a convex meniscus forms at the brim. Table 21. Test for cement content using one of the methods previously described, then determine the particle density of the recovered cementitious material. Copyright © 2020 Elsevier B.V. or its licensors or contributors. The traditional method, governed by ASTM D5630 and ASTM D2584, involves placing 2–3 g of the sample material in a crucible and heating in a furnace to temperatures higher than burn-off temperature of the base polymer. Alkalis sublime in high temperature zones of the furnace and then re-condense in the low temperature zones, reducing the mechanical strength of coke in the lower part of the furnace, forming scaffolds on the furnace lining and attacking the furnace lining refractory. The ash content of petroleum products is generally low. The meaning of AC abbreviation is "Ash Content" What does AC mean? 3.3. Learn more. The high ash content of South African coals requires that it must be beneficiated prior to utilization in processes such as direct liquefaction and the manufacture of coke. It contrasts with the method used by English-speaking countries, which grades flour instead by protein content and strength. Particles injected directly in the stratosphere have a lidar ratio around 50 sr, but the situation changes drastically with time, reaching values around 20 sr for the Pinatubo plume about 5–6 months after the eruption. The residues after a sample is completely burnt - in contrast to the ash remaining after incomplete combustion - consist mostly of metal oxides. In pursuit of what brings meaning. ash phrase. The test will identify the total filler content. It could be observed that the shape of the curve for each grade is similar to the change in modulus value changes depending on the amount and type of the filler. TransLiteral Foundation. Subtract the mass of the oven tray and cloth to obtain the mass of the dried material. Ash reduction can be managed through feed blending and through water or dilute acid washing, although the financial and energy cost implications of washing can be significant. as(h), ash- ] The baby boy name Ash is also used as a girl name. As established on the american standard testing method D-482, the mass of ash is 16% of the mass of its carbon residue. Effect of ash on the stampability. The sample is heated through programmed heating profile precisely controlled by a computer. The situation in the stratosphere is substantially different. McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill … The ash content of coal is a crucial parameter for the coking process. The extent of attrition increased with temperature and fluidization velocity and decreased with increasing particle size. Ash content is usually small for wood but can reach up to 20% in mass for some biomasses (see Table 9.6).The alkali nature of biomass ashes tends to lower the fusion point of ashes leading to fouling and slagging. What is ash content? Ash - Meaning of Ash. Dipak K. Sarkar, in Thermal Power Plant, 2015. • BONE ASH (noun) The noun BONE ASH has 1 sense:. The ash consists mainly of silica and aluminium and the amount is dependent on the base raw material used to produce the product. The latter can be derived, for example, with a sun photometer or with optical particle counters, or it can be assumed from climatology. Moisture can determine the aesthetics of food, giving estimates to product shelf life regardless of sample properties in a wet or dry state. Ash content and composition of calcined cokes used to make the WVU graphites, F. Scala, ... P. Salatino, in Fluidized Bed Technologies for Near-Zero Emission Combustion and Gasification, 2013. Ash management is therefore important. Although the ash contents in all of the calcined cokes appear rather high, these materials may still be acceptable because many of the metallic species are driven off during graphitization. There is increasing attention on the ash composition of coal, particularly with respect to Al2O3, SiO2 and alkalis. 2020. Papers Reporting Lidar Ratio and Particle Depolarization Ratio Values Reported in Fig. 4 About Stratospheric and Tropospheric Volcanic Plumes. A. Bridgwater, in Biomass Combustion Science, Technology and Engineering, 2013. The critical range of Na/V ratios is 0.08–0.45 of which 0.15–0.30 are particularly destructive. Literature data obtained by early stamping tests (Stuchlik, 1970) with coal samples of varying ash contents from 4% to 16% were used to investigate the effect of the coal ash contents on its stamping behavior and on coal cake density. The optimum ash content is mostly an economical decision. Attrition by abrasion of sand was investigated in a BFB by Lin and Wey (2003, 2005) and in a CFB by Jiang et al. Figure 11.16. Remove the tray and contents from the oven, weigh to the nearest 0.1 g. Continue drying in 1-minute intervals until the reduction in mass is less than 0.3 g, about 9 minutes total drying time is required for calibration samples containing 1000 g of cement. English Dictionary meaning of ash content. Typically, the ash value is in the range of 0.03 –0.07% by weight, although in certain oils higher ash content may be found. Definition of ash (Entry 2 of 3) 1 : something that symbolizes grief, repentance, or humiliation. Marenco and Hogan (2011) quantified the contribution of ash into the PBL, based on the assumption that the observed aerosols could be classified into depolarizing (ash) and nondepolarizing particles (locally emitted spherical particles). Ash content represents the incombustible component remaining after a sample of the furnace oil is completely burned. Ash testing, also commonly referred to as ash content analysis, is a hugely important element of research and development for a number of key reasons. Recovery of cement into gas jar. Click here to place an order for determining Ash. Before the pfa content can be found the total cementitious content of the concrete has to be determined by one of the analysis methods described previously. Values are obtained by literature reported in Table 3. Ash ... All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. Where the difference between the pfa content results for both samples is less than 5 per cent the test is valid and the mean of the two results is the measured pfa content. A crucible and its lid are pre-weighed after thorough drying. ash content meaning, definition, English dictionary, synonym, see also 'content',content provider',to one's heart's content',contented', Reverso dictionary, English simple definition, English vocabulary Ash consists of extraneous solids, residues of organometallic compounds in solution, and salts dissolved in water present in the fuel. Knowledge of the amount of ash-forming material present in a product can provide information as to whether or not the product is suitable application. It includes metal salts which are important for processes requiring ions such as Na+ (Sodium), K+ (Potassium), and Ca2+ (Calcium). You can... | Meaning, pronunciation, translations and examples Moisture content has been established as an important indicator of shelf life for foods. (11.8): The achieved results based on tests at three different stamping energy levels are plotted in Fig. 11.16. 2 usually pl. The coal injection rate is projected to increase from 134.5 to 138 kg/t-hot metal to maintain a constant raceway temperature. Some methods were developed after the Icelandic eruption of Eyjafjallajökull to detect and quantify the mixing of ash particles with other aerosols. Ash content represents the incombustible component remaining after a sample of the furnace oil is completely burned. ash content. The “ash content” is a measure of the total amount of minerals present within a food, whereas the “mineral content” is a measure of the amount of specific inorganic components present within a food, such as Ca, Na, K and Cl. (2009) investigated the thermally-induced primary fragmentation of quartzite particles. Wipe the external surfaces with the absorbent cloths and weigh and record its mass, then discard the water. Use a fine jet washer bottle to wash all the slurry from the RAM constant-volume vessel into the gas jar. Fillers and reinforcements are added into thermoplastic materials to modify the properties such as stiffness, hardness, chemical and corrosion resistance, fire resistance, differential shrinkage, weathering, and sometime to reduce cost. Some of the ash forming constituents occur naturally in crude oil; others are present as a result of refining or contamination during storage or distribution. Objective: To determine the ash content of food samples. D S vd Westhuizen, ... J J Prinsloo, in 1991 International Conference on Coal Science Proceedings, 1991. About Me We are a creative and ambitious team. Search for "AC - Ash Content" in. As reported in Section 4, vertical profiles of volcanic ash mass concentration can be estimated from the extinction coefficient by using an estimate of the specific extinction. It is defined as inorganic residue that remains after combustion of the oil in air at specific high temperature. The effect of increasing coal ash from 6.2% to 9.3% on the performance of a blast furnace has been calculated using the blast furnace thermochemistry model (Oshnock, 1995b). the purest, sweetest, kindest human you'll ever meet. Ashranges from 0.1–0.2%. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B978008102201600011X, URL: https://www.sciencedirect.com/science/article/pii/B9780128015759000032, URL: https://www.sciencedirect.com/science/article/pii/B9780081004050000148, URL: https://www.sciencedirect.com/science/article/pii/B9780750656863502640, URL: https://www.sciencedirect.com/science/article/pii/B9780857091314500078, URL: https://www.sciencedirect.com/science/article/pii/B9781782421160500141, URL: https://www.sciencedirect.com/science/article/pii/B9780750603874502369, URL: https://www.sciencedirect.com/science/article/pii/B9780323395007000034, URL: https://www.sciencedirect.com/science/article/pii/B9780080426839500091, URL: https://www.sciencedirect.com/science/article/pii/B9780857095411500066, Fast pyrolysis of biomass for the production of liquids, Biomass Combustion Science, Technology and Engineering, Evaluation of coal for metallurgical applications, The Coal Handbook: Towards Cleaner Production: Coal Utilisation, DIFFERENCES IN THE PROPERTIES OF LOW ASH COAL OBTAINED BY FROTH FLOTATION AND DENSITY SEPARATION, 1991 International Conference on Coal Science Proceedings, PETER G. STANSBERRY, ... ALFRED H. STILLER, in, Carbon Materials for Advanced Technologies, Attrition phenomena relevant to fluidized bed combustion and gasification systems, Fluidized Bed Technologies for Near-Zero Emission Combustion and Gasification. Vanadium in fuel oil combines with oxygen in the combustion process and creates pentavanadate (V2O5) droplets that melt at 573–773 K. Over time, these pentavanadate droplets accumulate and form a hard crust in the interior of the equipment. It is measured by converting the mineral constituents to the respective oxides at 800°C. Ash content also is essential to a food’s nutrition and longevity. Most Popular APA All Acronyms. What does Ash mean? Its pronunciation is AE-SH †. It is defined as inorganic residue that remains after combustion of the oil in air at specific high temperature. Effects of fillers and reinforcements on properties of nylon 6. To mitigate these problems magnesium oxide is introduced, creating a new molecule that will not stick to the interior walls and pipes of boilers and furnaces, allowing better heat transfer thereby increasing combustion efficiency. The data collection is based on the loss in weight as a function of temperature. Although the equipment itself is much more expensive, however, the data received is invaluable and has much larger engineering application than just the ash residue [9]. They can make your heart flutter in one giggle. In evaluating these data, the true density of coal was calculated based on assumed mineral matter density and mineral/ash factor. Figure 3.3. Test Method D2584 is recommended for unknown samples, and in instances where fusion of the inorganic portions may be of concern. : ash is 16 % of the inorganic residue that remains after combustion of the from... At both the 0 per cent pfa and 80 per cent pfa and 80 per cent pfa content the. 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