ISSN:0090-8312    

DOI:10.1080/00908319508946066

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Samples of 15 Turkish lignites were oxidized by performic acid. Their mineral matter was isolated without any important chemical decomposition. The x-ray diffraction method was employed to determine the mineral species in the isolated mineral matter and in the ashes of the lignite samples. The results were compared and discussed.

ISSN:0090-8312    

DOI:10.1080/00908319508946067

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Organic carbon (Corg) and total nitrogen (N) contents in Tertiary mudstone samples from four basins in northern Kyushu, Japan, were determined by using a CHN analyzer. A good correlation was observed between the stratigraphic distribution of the Corg/N values and geologically inferred depositional environments. Pyrite contents in carbonaceous sediments from the same basins were also obtained employing a reflecting microscope. Stratigraphic changes of pyrite content in car-bonaceous sediments can be correlated with these depositional environments. Pyrite is expected to play a useful role as an index mineral in estimation of depositional environments in future studies.

ISSN:0090-8312    

DOI:10.1080/00908319508946068

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The concentration of 21 elements in fly ash from three boilers (75 MW, 150 MW and 300 MW) at the EGAT power plant, Mae Moh, Thailand, were determined by instrumental neutron activation analysis (INAA). The concentration of 10 major elements was determined by x-ray fluorescence (XRF). Arsenic, Co, Cr, Ni, Mo and Sb generally increase in concentration going from bottom ash (BA) through the sequence of electrostatic precipitator ashes (ESPA) and reach maxima of As (352 ppm), Co (45 ppm), Cr (105) ppm, Mo (32 ppm), Ni (106 ppm) and Sb (15 ppm) in the ESPA. Cerium, Cs, Fe, Hf, La, Sc, Ta, Tb and Yb did not exhibit concentration trends or are variable except in the case of one boiler (unit 6), which showed an increase going from BA to ESPA. Only Br decreased in composition going from BA to ESPA. Rubidium, Sm, U and Th showed marked variation in trends.

ISSN:0090-8312    

DOI:10.1080/00908319508946069

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This study reports on the enrichment and depletion of elements in selected suites of subbituminous coals from the Highvale Mine, Alberta, Canada and in their 120°C, 400°C and 800°C ashes. All elements analyzed in the raw coal are within the world range for coals and some small variations in elemental concentration were noted due to variations in ash content of the samples. Ashing at 120°C resulted in an enrichment of all elements by a factor of 1.5 × to 6.5 × in one suite of samples and by a factor of 5 × to 11× in the other suite. Generally, the elements Br and Se are enriched by a lower factor than other elements, Mo is absent in all 120°C ashed samples and the samples with the higher ash content show a smaller elemental enrichment than samples with lower ash content (cleaner coals). All elements in the 400°C ashed samples are enriched by a factor of 1.5 × to 6.5 × in one suite of samples and by 1.5 × to 9.5 × in the other. Surprisingly, the elements Br, CI and Se are enriched two- to sixfold, pointing to the possibility of formation of salts (i.e., bromide salts), a process taking place due to the reactions of anions with cations during ashing. By 800°C, the elements Br, CI and Mo are completely volatilized.

ISSN:0090-8312    

DOI:10.1080/00908319508946070

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Coals from the Highvale Mine, central Alberta Plains, were studied in order to determine the quantity (range and mean values), affinity and mode of occurrence of the elements present in these subbituminous coals. Detailed elemental analyses were carried out for all coal seams and interburden in two drillholes, HV901-84 and HV904-84. In total, 49 samples were analyzed from the 16-m-deep HV904-84 drillhole (approximately three samples per meter of succession) and 33 samples from the 10.8-m-deep HV901-84 drillhole (also three samples per meter of succession).

ISSN:0090-8312    

DOI:10.1080/00908319508946071

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Flooded former coal mines of Springhill, Nova Scotia, contain about 4,000,000 m3of water which circulates by convection and may be recovered at the surface at a temperature of about 18°C. The heat in the water is derived from the normal heat of the rocks and the contribution from chemical heating is negligible. Water is pumped from the mines to act as the primary input to heat pumps for heating and cooling industrial buildings. Annual heat exchange with the mine by the largest user puts more heat into the mine in summer than is taken out in winter. Buildings without heavy machinery, such as office buildings, drain little heat from the mine, so that many heat exchange systems could operate indefinitely, without significant depletion of the heat source. Initial costs of heat pump installation are higher than the costs of conventional oil furnaces, but the operating costs are substantially lower. In the Springhill systems, heat pumps provide summer cooling as well as winter heating and total costs of geotherrnal heating are substantially lower than heating by fuel oil in eastern Canada. There is a net saving in the emission of carbon dioxide to the atmosphere.

ISSN:0090-8312    

DOI:10.1080/00908319508946072

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

The Bowser Basin covers approximately 50,000 km2within the northern part of the Intermontane Belt in northwestern British Columbia. The Groundhog coalfield encompasses approximately 5,000 km2in the north-central part of the basin.

ISSN:0090-8312    

DOI:10.1080/00908319508946073

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Three coals were combusted in the Alberta Research Council laminar flow combus-tor in order to understand the changes in the physical structure that occur during pulverized coal combustion. A subbituminous (coal A) and both high-volatile (coal B) and low-volatile bituminous (coal C) coals were chosen to examine coals of different rank and reactivity.

ISSN:0090-8312    

DOI:10.1080/00908319508946074

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor