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Monday, May 18, 2020 | History

2 edition of Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal found in the catalog.

Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal

Nsakala Ya Nsakala

Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal

technical report 2

by Nsakala Ya Nsakala

  • 300 Want to read
  • 33 Currently reading

Published by Dept. of Energy, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

    Subjects:
  • Pyrolysis.,
  • Charcoal.,
  • Coal, Pulverized.

  • Edition Notes

    StatementNsakala ya Nsakala, Philip L. Walker, Jr., R. H. Essenhigh.
    SeriesFE ; 2030-TR 2, FE -- 2030-TR 2.
    ContributionsWalker, P. L. 1928-, Essenhigh, Robert H., United States. Dept. of Energy.
    The Physical Object
    Paginationviii, 162 p. :
    Number of Pages162
    ID Numbers
    Open LibraryOL17647978M

    Biomass/fossil fuel co-gasification could be a bridge between energy production based on fossil fuels and energy production based on renewable fuels. In this work, CO₂ co-gasification of switchgrass with coal and fluid coke was conducted in a thermogravimetric analyzer at °C. Coal gasification kinetics were inhibited or enhanced, depending on the switchgrass concentration in the mixture Cited by:   Treatment of biowaste, the predominant waste fraction in low- and middle-income settings, offers public health, environmental and economic benefits by converting waste into a hygienic product, diverting it from disposal sites, and providing a source of income. This article presents a comprehensive overview of 13 biowaste treatment technologies, grouped into four categories: (1) Cited by:

    Combustion Engineering, a topic generally taught at the upper undergraduate and graduate level in most mechanical engineering programs, and many chemical engineering programs, is the study of rapid energy and mass transfer usually through the common physical phenomena of flame oxidation. The gas is a low to medium heating value fuel gas that may be used as such for process heat (e.g. for feed drying) or power generation Review of Biomass Pyrolysis Technologies 15 Table 3 Thermochemical conversion primary products and technologies Product Form Components Source Fuel gas LHV CO, H 2, CO 2, Pyrolysis, CH4, N2 air gasification MHV.

    Coal-fired utility boilers are the most prominent electricity generation systems, producing % of consumed electricity across the globe (42% in the U.S.) (EIA ; ). Coal exists in great abundance around the world, and is a valuable solid fuel because of its high energy density and low cost. Coal does, however, have well-knowCited by: 1. of ASTM classification. The following descriptions briefly summarize the characteristics of each coal rank. Peat Peat, the first product in the formation of coal, is a heterogeneous material consisting of partially de-composed plant and mineral matter. Its color ranges from yellow to .


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Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal by Nsakala Ya Nsakala Download PDF EPUB FB2

Get this from a library. Characteristics of chars produced by pyrolysis following rapid heating of pulverized coal: technical report 2. [Nsakala Ya Nsakala; Philip L Walker; Robert H Essenhigh; United States. Department of Energy.]. All produced chars showed low H/C and O/C (–) ratios suitable for BF injection except BC ().

and the differences of pulverized coal pyrolysis, combustion and gaseous compounds. An entrained-flow, isothermal furnace was used to study rapid pyrolysis in nitrogen of a Texas lignite.

Weight losses for fixed residence times up to s were independent of particle size over the range of mean diameter from 41 to μm and increased with temperature elevation over the range to Cited by: Modeling the development of char structure during the rapid heating of pulverized coal Article in Combustion and Flame (4) March with 24 Reads How we measure 'reads'.

Table 2 compares the yields of chars produced by slow pyrolysis with the yields of chars produced by rapid pyrolysis in the free fall reactor. Rapid heating rate has resulted in less char formation than obtained at slow heating rates. Pyrolysis chars were generated under rapid-heating conditions ( °C/s) in a drop-tube reactor to closely resemble chars generated in pulverized combustion conditions.

The more» inertinite-rich coal took ~ ms to devolatilize in the drop-tube, compared to only ~ ms for the vitrinite-rich by: 2.

Pyrolysis chars were generated under rapid-heating conditions ( °C/s) in a drop-tube reactor to closely resemble chars generated in pulverized combustion conditions. The more» inertinite-rich coal took ~ ms to devolatilize in the drop-tube, compared to only ~ ms for the vitrinite-rich sample.

Residual sludge disposal costs may constitute up to, and sometimes above, 50% of the total cost of operation of a Wastewater Treatment Plant (WWTP) and contribute approximately 40% of the total greenhouse gas (GHG) emissions associated with its operation.

Traditionally, wastewater sludges are processed for: (a) reduction of total weight and volume to facilitate their transfer and subsequent Cited by: Kobayashi () determined the retention of C, II, N, S, and O in chars, following the pyrolysis of coal, in crucible, free fall, and laminar flow experiments, as a function of time and temperature.

The retentions were cal- culated from the original compositions of the coals, measured overall weight losses, and the concentrations of the. Pair your accounts. Export articles to Mendeley. Get article recommendations from ACS based on references in your Mendeley library.

Abundant studies have been completed about factors on the pyrolysis of coal and biomass. However, few articles laid emphasis on using CO2 as a carrier gas to explore the compositional changes of pyrolysis products in coal and biomass pyrolysis for industrial application and commercial value.

The experiments on coal and biomass pyrolysis in N2 and CO2 using a horizontal tube furnace were Cited by: 1. Effect of Coal Characteristics and Molybdenum Sulfide Catalyst on Conversions and Yields of Heavy Products from Liquefaction in Phenanthrene.

Effects of Pyrolysis Heating Rate on Intrinsic Reactivities of Coal Chars. Energy & Fuels c APPENDIX B COAL CHARACTERISTICS Although coals have been classified or ranked in a number of different ways, from the standpoint of the power plant operator it is generally sufficient to know that coals are ranked in the following broad categories: Anthracite Bituminous Guhbituninous Lignite It is the operator's job to cope with the.

This study reports the adsorption characteristics of bio-oil on biochar in biochar/bio-oil slurry (i.e., bioslurry) systems at three biochar loading levels (,and %, respectively).

At low biochar loading levels ( or %), heavy organic compounds (particularly those containing fused aromatic systems) in bio-oil was selectively adsorbed onto the by: 4. () Product compositions and kinetics in the rapid pyrolysis of milled wood lignin. Industrial and Engineering Khila, KC () Influence of mineral matter on biomass pyrolysis characteristics.

() Formation of the structure of chars during devolatilization of pulverized coal and its thermoproperties: A review. Progress Cited by: Kandiyoti: Combustion reactivity and morphological change in coal chars: Effect of pyrolysis temperature, heating rate and pressure, Fuel, Vol, pp () References [42] C.

Luo, T. Watanabe, M. Nakamura, S. Uemiya and T. Kojima: Gasification kinetics of coal chars carbonized under rapid heating.

Yu J, Lucas JA, Wall TF, Liu G, Sheng C, 'Modelling the development of char structure during the rapid heating of pulverized coal', Combustion and Flame, () [C1] DOI /tflame   However, most of these works do not pay significant attention to the fuel ratio and ignitability with the heating value (calorific value) of biomass chars produced through torrefaction.

Research work on the changes in the ash compositions and ash fusion temperatures of the torrefied biomass of Nigeria origin is also : A.A.

Adeleke, J.K. Odusote, P.P. Ikubanni, O.A. Lasode, M. Malathi, D. Paswan. In this study, pyrolysis was used to upgrade the agricultural biomass waste (ABW) and increase its energy at pyrolysis temperatures ranging from to °C and a residence time of 60 minutes.

The produced biochars were characterized and their fuel qualities (such as, fixed carbon & carbon percentage, gross calorific value, pH and surface area) were by: 1. This study presents a review of the various methods to predict the spontaneous combustion liability of coal and coal-shale.

The relative propensity of coal to undergo self-heating can be established by different methods. These methods are well established in their usage, but the fact that no particular test method has become a standard to predict the spontaneous combustion liability indicates Cited by: 6.

AbstractThe influences of coal rank, particle size, temperature and gasifier atmosphere on the gas generation of lump coals used in COREX gasifier were investigated. The results showed that an increase in gasifier temperature and a decrease in particle size hardly affected the final mass loss of lump coals but strongly enhanced the gas generation : Runsheng Xu, Jianliang Zhang, Wei Wang, Haibin Zuo, Zhengliang Xue.Coal pyrolysis has been studied in a cm diameter continuous spouted bed reactor with the aim of determining conditions for maximum liquid yields from Western Canadian coals.

Coals studied included two British Columbia bituminous coals and one Alberta sub-bituminous coal. The basic characteristics of the spouted bed pyrolyzer were determined by carrying out experiments over a range of Cited by: 2.The method uses biomass material (glycerol solution m or m, m, or m glucose solution) first preheated to –°C and then mixed with supercritical water (>°C) to produce a rapid heating of the material to a supercritical state; this improves the rate of free reactions and reduces tar and coke formation.

Therefore.