Direct Method Determination of the Gas Content of CoalProcedures and Results.
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|Series||Report of investigations (United States. Bureau of Mines) -- 8515|
|Contributions||Diamond, W., Levine, J.|
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This practice describes methods for the direct determination of the gas content of coal by desorption using samples obtained by drill coring methods from the surface.
It sets out guidelines for the equipment construction, sample preparation and testing procedure, and method of calculation. DIRECT METHOD DETERMINATION OF THE GAS CONTENT OF COAL: PROCEDURES AND RESULTS by W.
Description Direct Method Determination of the Gas Content of Coal PDF
Diamond1 and J. Levine2 ABSTRACT The explosion hazard of methane-air mixtures has become an increasingly serious mine planning problem, and an advance assessment of methane gas poten.
In mixed gas conditions the composition of the desorbed gas is also measured to account for contribution of various coal seam gas in the mix. The determination of gas content using the direct method is associated with errors of measurement of volume of gas but also the errors associated with measurement of composition of the desorbed by: 7.
The direct method of determining methane content of coalbeds for ventilation design by: Kissell, Fred N. Published: () Assessment of the coal-bed gas total petroleum system in the Cook Inlet-Susitna region, south-cental Alaska by: Rouse, William A. Published: (). Coalbed gas content measurements are commonly used in mine safety as well as coalbed methane resource assessment and recovery applications.
Gas content determination techniques generally fall into two categories: (1) direct methods which actually measure the volume of gas released from a coal sample sealed into a desorption canister and (2) indirect methods based on Cited by: gas content of coal is determined using a direct method, whereby the gas desorbed from solid or crushed coal is collected and the volume and composition of the desorbed gas are measured.
Details Direct Method Determination of the Gas Content of Coal FB2
The determination of gas content is associated with errors of measurement of the volume and composition of the gas. provide guidelines on the testing of coal samples for gas content. This Guide supersedes AS –, Guide to the determination of desorbable gas content of coal seams—Direct method.
The slow desorption method outlined in this Guide is based on the direct method developed by the US Bureau of Mines*. Gas content determination techniques generally fall into two categories: (1) direct methods which actually measure the volume of gas released from a coal sample sealed into a desorption canister.
and indirect methods of determining the gas content of coal are practiced. The direct method is based on the direct measurement of gas volume evolved from coal whereas the indirect method consists of measuring other coal properties and using the established relationships between these parameters and gas content to evaluate the latter.
in coal, total gas contained in coal is the sum of free gas content and adsorbed gas content. However, the traditional method of measurement does not allow the determination of the free gas component of gas in coal.
Using the direct method, the volume of gas which is measured consists only of adsorbed gas. This gas in turn can be. The gas content of coal per unit weight as determined by the direct method test can be used as a basis for a preliminary estimate of mine ventilation requirements, and to determine if degasification of the coalbed in advance of mining should be considered.
Additional Physical Format: Diamond, W.P. (William P.). Direct method determination of the gas content of coal 36 p. (OCoLC) Online version. ‘Direct determination’ refers to determination of coalbed gas content by taking coal samples from bore-holes and measuring actual gas content of such coal samples through desorption.
It is a simple but feasible method where loss in sampling, desorption and residue of coal samples are considered. Guide to the determination of gas content of coal - Direct desorption method: AS (R) Coal and coke - Analysis and testing Determination of trace elements - Coal, coke and fly-ash - Determination of fluorine content - Pyrohydrolysis method: AS (R).
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Additional Physical Format: Diamond, W.P. (William P.). Direct method determination of the gas content of coal 36 p. (DLC) (OCoLC) as the measure d gas content value, thus a gas adsorption test is essential for coal to evaluate the gas storage capacity [Busch and Gensterblum, and Rice, ].
T he direct gas content measurement methods was first developed by U.S. Bureau of Mines. A new site-specific (Tier 3) method has been developed to determine greenhouse gas emissions from open coal mining. The Tier 3 method presented here is based on extensive measurement of gas emissions from open-cut coal mines and the physics of gas desorption from coal.
Buy JIS M Coal and coke - Methods for proximate analysis from SAI Global loss on drying in helium gas flow Measuring method of loss on drying in nitrogen gas flow Azeotropic distillation method (direct volumetric method) 6 Determination of ash content Summary Apparatus and instrument Test portion Procedure.
AS Determination of gas content of coal and carbonaceous material - Direct desorption method (FOREIGN STANDARD) Specifies procedures for the determination of the desorbed gas content of coal and carbonaceous material by directly measuring the volume of gas, using the water displacement method, from material obtained by coring or collection of lump samples.
MEASUREMENT OF GAS CONTENT OF COAL. Gas content of coal is determined by direct measurement of the volume of gas desorbed from coal. In Australia two methods are routinely used, namely the ‘slow desorption’ and ‘fast desorption’ methods (Williams, et al., ; Saghafi, et al., ). Variants of both methods have been used in other coal.
The proposed Practice describes methods for the determination of the gas content of coal by desorption, using samples obtained by surface drilling and from underground. It sets out guidelines for the equipment construction, sample preparation and testing procedure, and method of calculation.
Coal Centre – Coal sampling and analysis standards 4 Abstract Each year, billions of tonnes of coal are traded in regional and international market for use in power generation, steel and cement making, and many other purposes. In commercial operations, the price of coal.
According to statistics, many similar coal–gas symbiotic accidents of gas explosion and spontaneous coal combustion induced by gas extraction take. Operating conditions for the determination of sucrose by capillary gas chromatography.
Modern Methods in Bituminous Coal Analysis: Trace Elements. Direct Determination of Manganese in Gasoline by Atomic Absorption Spectrometry in the Nitrous Oxide-Hydrogen Flame.
(thickness) and fixed-carbon content of 12 bituminous coal samples (A) and depth (thickness) and carbon-hydrogen atomic ratios of 12 bituminous coal samples (B) _____ 12 TABLES TABLE 1. Proximate and ultimate analyses, heat content, forms of sulfur, free swelling index, ash-fusion temperature, and specific-gravity.
Coal-bed gas content must have reached near-saturation either by biogenic or thermogenic gas-generation processes to be economically viable. Cleats must be present to allow for connectivity between sorption sites. If the coal-bed horizons are buried deeply (~2 or more km), cleats are closed because of.
This method of mercury determination in coal is based on the atomization of mercury contained in the sample in a PYRO+ attachment and subsequent mercury determination by flameless AAS in a mercury analyzer RAM/RA+.The interference from the remaining impurity compounds is eliminated due to the high selectivity of the RAM/RA+ analyzer with the Zeeman background.
Must use indirect methods to assess the accuracy of the calculation. Indirect Method: The primary calculations such as flue gas analyzer and exhaust gas temperature can be done very accurately. Requiring more calculations than the direct method.
Calculations correction can be done to pursue the existing standards or to the fulfillment of the. Of the three fossil fuels in common use – natural gas, petroleum, and coal – the United States has far more coal than gas and petroleum (compare Figuresand ).
This suggests that, when supplies of gas and petroleum become scarce, it would be possible to turn to coal as our major fossil fuel energy resource. AV Direct Method for Determining Organic Shale Potential from Porosity and Resistivity Logs to Identify Possible Resource Plays* Thomas Bowman1.
Search and Discovery Article # () Posted J *Adapted from oral presentation at session, Genesis of Shale Gas--Physicochemical and Geochemical Constraints Affecting Methane. Gas content determination techniques generally fall into two categories: (1) direct methods which actually measure the volume of methane released from a coal sample sealed into a desorption canister and (2) indirect methods based on empirical correlations, or laboratory derived sorption isotherm methane storage capacity data.
Laboratory.seam gas content, the total flow of methane in a specific mine depends on many diverse factors and there is no simple generalization Several direct and indirect methods exist to measure seam gas content Gas Content Will Increase with Coal Rank A Direct Method Linear relationship between amount of gas and the square root of time of desorption.Basically Boiler efficiency can be tested by the following methods: 1) The Direct Method:Where the energy gain of the working fluid (water and steam) is compared with the energy content of the boiler fuel.
2) The Indirect Method:Where the efficiency is the difference between the losses and the energy input. The Direct Method Testing
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