situ in situ heat value of coal

situ in situ heat value of coal

A method for in-situ measurement of calorific value of ...

2021-9-1 · The overall workflow of the in-situ determination of the coal calorific value in a power plant is shown in Fig. 1. To begin with, the coal powders were sampled from a coal piping using a sampling gun. Then, the sample was collected into a metal crucible placed under the sampling gun and weighted by a precision balance with 0.1mg accuracy.

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UDC 622 . 341 . 1 Evaluation of Coal Properties Using

2012-9-14 · Evaluation of Coal Properties Using High Temperature in-situ NMR Imaging Method Koji SAITO*1 Kenji KATO*2 Abstract To monitor the dynamical changes in coals with temperature, an in-situ method must be used, therefore, we have applied single-point-imaging and have carried out the first systematic in-situ variable-temperature NMR imaging study of ...

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In Situ Measurements of Boiler Ash Deposit Emissivity and ...

The estimated thermal conductivities fall within the range of values reported by others; however, the deposit formed by the coal blend had a substantially higher thermal conductivity than either of the two parent coals. The in situ measurement system, which is called INSITE for In Situ Temperature and Emissivity, has been successfully operated ...

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In situ thermal conductivity of gas‐hydrate‐bearing ...

2005-11-29 · In situ thermal conductivity of gas-hydrate-bearing sediments of the Mallik 5L-38 well. ... The lowest values were calculated for the sporadic coal-bearing sections, ... which were calculated from the measured geothermal gradients and an estimated local heat flow value of 55 mW m −2 based on Fourier's law of heat conduction. It is therefore ...

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An experimental study on the feasibility of in-situ ...

The test coal was first crushed and then sieved to size between 0 and 3 mm, as exhibited in Table 1.The proximate analysis on as-received basis and total sulfur content on dry basis of the coal are listed in Table 2.It can be seen that the ash and volatile contents were at high and low levels respectively.

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In situ coal combustion heat recovery method -

A method for recovery of heat generated by the combustion of coal in situ within coal seams in the earth. Three embodiments are described: one, in which the coal seam crops out and into which can be drilled and inserted a pipe, through the coal seam, to a central point, where it is joined with a vertical pipe drilled from the surface.

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Solid fossil-fuel recovery by electrical induction heating ...

1980-4-1 · ELECTRICITY, SUB BITUMIN- ELECTRICITY 01~s COAL IN- __c HIGH- HEAT-VALUE GAS DUCTION HEAT-T- TAR ING IN SITU UDCI t UGCC Fig.2. Block schematic of Class 2 installation. Class 3 is the production of gas and tar from the induction heating of coal in situ. For example, four coal installations of about equal size are blocked out.

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In situ Raman imaging of high-temperature solid-state ...

2019-5-27 · The deposition of mineral phases on the heat transfer surfaces of brown coal power plants may have a negative effect on power plant boilers. The paragenesis of these deposits contains information about the actual temperature prevailed during the combustion of lignite, if the temperature-dependences of distinct mineral transformations or reactions are known. Here, we report results of a ...

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Experimental Ivestigation of the Temperature and Pore ...

2013-10-22 · The in situ gasification technique can be classified into traditional underground coal gasification (UCG) technique which involves combustion and in situ pyrolysis technique. Lignite has worked out to be the most promising type of coal to be exploited by the UCG techniques (Shackley et al. 2006 ; Li 2004 , 2007 ; Stańczyk et al. 2011 ).

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Process for coal desulfurization - ZAVITSANOS; PETER D.

Hence, by utilizing microwave heat energy, only 0.3-1% of the heating value of coal is necessary in order to induce an in-situ reaction which favors the volatilization of sulfur in the form of a

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A method for in-situ measurement of calorific value of ...

Coal calorific value is an important indicator in the combustion optimization of power plants and the calculation of operating efficiency. Hence, the in-situ measurement of the coal calorific ...

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(PDF) IN SITU THERMAL DESORPTION OF COAL TAR

In Situ Thermal Desorption (ISTD) is a soil remediation process in which heat and vacuum are applied simultaneously to subsurface soils. Depending on the depth of treatment, an array of either ...

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In situ thermal conductivity of gas‐hydrate‐bearing ...

2005-11-29 · In situ thermal conductivity of gas-hydrate-bearing sediments of the Mallik 5L-38 well. ... The lowest values were calculated for the sporadic coal-bearing sections, ... which were calculated from the measured geothermal gradients and an estimated local heat flow value of 55 mW m −2 based on Fourier's law of heat conduction. It is therefore ...

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Evaluation of Coal Properties Using High Temperature in ...

The fact that rapid heating treatment of coal raised on DI150 is at almost 6 point in the treatment of temperature at 380 °C, compared to the raw sample and slow heat sample is mainly caused by ...

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UDC 622 . 341 . 1 Evaluation of Coal Properties Using

2012-9-14 · Evaluation of Coal Properties Using High Temperature in-situ NMR Imaging Method Koji SAITO*1 Kenji KATO*2 Abstract To monitor the dynamical changes in coals with temperature, an in-situ method must be used, therefore, we have applied single-point-imaging and have carried out the first systematic in-situ variable-temperature NMR imaging study of ...

Read More
In situ coal combustion heat recovery method -

A method for recovery of heat generated by the combustion of coal in situ within coal seams in the earth. Three embodiments are described: one, in which the coal seam crops out and into which can be drilled and inserted a pipe, through the coal seam, to a central point, where it is joined with a vertical pipe drilled from the surface.

Read More
Process for coal desulfurization - ZAVITSANOS; PETER D.

Hence, by utilizing microwave heat energy, only 0.3-1% of the heating value of coal is necessary in order to induce an in-situ reaction which favors the volatilization of sulfur in the form of a

Read More
Method for increasing the calorific value of gas produced ...

Such in situ gasification processes are usually initiated in the coal bed with the resulting combustion zone expanding through the coal formation in either a reverse or forward burn configuration. The heat of combustion gasifies the coal to provide recoverable gaseous products which

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In Situ Measurements of Boiler Ash Deposit Emissivity and ...

The estimated thermal conductivities fall within the range of values reported by others; however, the deposit formed by the coal blend had a substantially higher thermal conductivity than either of the two parent coals. The in situ measurement system, which is called INSITE for In Situ Temperature and Emissivity, has been successfully operated ...

Read More
Experimental Ivestigation of the Temperature and Pore ...

2013-10-22 · The in situ gasification technique can be classified into traditional underground coal gasification (UCG) technique which involves combustion and in situ pyrolysis technique. Lignite has worked out to be the most promising type of coal to be exploited by the UCG techniques (Shackley et al. 2006 ; Li 2004 , 2007 ; Stańczyk et al. 2011 ).

Read More
A method for in-situ measurement of calorific value of ...

Coal calorific value is an important indicator in the combustion optimization of power plants and the calculation of operating efficiency. Hence, the in-situ measurement of the coal calorific ...

Read More
(PDF) IN SITU THERMAL DESORPTION OF COAL TAR

In Situ Thermal Desorption (ISTD) is a soil remediation process in which heat and vacuum are applied simultaneously to subsurface soils. Depending on the depth of treatment, an array of either ...

Read More
Evaluation of Coal Properties Using High Temperature in ...

The fact that rapid heating treatment of coal raised on DI150 is at almost 6 point in the treatment of temperature at 380 °C, compared to the raw sample and slow heat sample is mainly caused by ...

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Thermodynamic analysis of in situ gasification-chemical ...

2015-11-13 · This section presents the results obtained from the application of the Gibbs free energy minimization technique to the in situ gasification-CLC for Indian coal, whose composition is given in Table 1. The results are analyzed for the three types of oxygen carriers considered for this study—Fe 2 O 3 , CuO, and mixed carrier—Fe 2 O 3 and CuO.

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Mathematical modelling of in situ combustion and ...

2017-8-2 · The application of ISG to coal seams is well developed and is usually referred to as underground coal gasification (UCG) or in situ coal gasification (ISCG). The fundamental phenomena occurring during ISC and ISG processes is extremely varied involving chemical reactions coupled with simultaneous heat, mass and momentum transfer in a multi ...

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Effects of chemical composition and petrography of coal ...

2017-11-23 · coal bed methane. In-situ gas content In-situ gas content values of most of the desorbed coal core samples from Well 1 of Jharia coalfield are found to vary from 4.55 cc/g to 13.47 cc/g (as received basis) and from 5.25 cc/g to 15.88 cc/g (dry ash free basis). The measured gas content data indicate that the study areas

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Isothermal Gasification of in Situ / ex Situ Coal Char ...

The so-called micro fluidized bed reaction analyzer (MFBRA) was adopted to implement the isothermal gasification of in situ coal char with CO2 under minimized external diffusion inhibition.

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Measurement of thermal conductivity and diffusivity in ...

surveyed literature, in situ methods can be divided into 'active' drill hole methods, and 'passive' indirect methods utilizing other drill hole measurements together with cutting samples and petrophysical relationships. The most common active drill hole method is a cylindrical heat producing probe whose temperature is registered as a function ...

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Data Mining of the Thermal Performance of Cool-Pipes in ...

2014-5-5 · Embedded cool-pipes are very important for massive concrete because their cooling effect can effectively avoid thermal cracks. In this study, a data mining approach to analyzing the thermal performance of cool-pipes via in situ monitoring is proposed. Delicate monitoring program is applied in a high arch dam project that provides a good and mass data source.

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A Current Appraisal of In-Situ Combustion Field Tests ...

In-situ combustion may be said to date back to 1888 when Mendeleev suggested the in-situ conversion of coal into combustible gases. In 1934, Sheinman and Dubrovai, on the basis of earlier laboratory studies, proposed the process of oil recovery by means of a proposed the process of oil recovery by means of a moving underground firefront.

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