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Test method of supercritical carbon dioxide content in coal

A carbon dioxide, supercritical technology, applied in the direction of analytical materials, instruments, etc., can solve the problems of complex test process, high requirements for instruments and equipment, and extensive restrictions on implementation, and achieve the effect of simple test process and low requirements for instruments and equipment

Inactive Publication Date: 2011-01-05
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] At present, the existing test methods mainly focus on the test of the adsorption performance of coal, and the test process is complicated, and the requirements for equipment are high, which limits the extensive development of the test and research of carbon dioxide content in coal to a certain extent.

Method used

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Embodiment Construction

[0028] The following structural drawings further describe an embodiment of the present invention:

[0029] The present invention comprises adopting vacuum pump, coal sample tank, carbon dioxide cylinder, pressurizing device and measuring device, and its testing procedure is as follows:

[0030] Step 1, measure in advance the internal space volume of the coal sample tank 12 located in the constant temperature water bath 13 of the coal sample tank: open the cut-off valve V-1, the cut-off valve V-4, and the cut-off valve on the pipeline connecting the coal sample tank 12 and the vacuum pump 1 in sequence. Valve V-7, micro stop valve F-2 and stop valve V-2, observe the vacuum pressure gauge 2 of the vacuum pump 1, when the direct air pressure drops below 0.4Pa, continue vacuuming for about 30 minutes, close the coal sample tank 12 and Stop valve V-1, stop valve V-4, stop valve V-7, and micro stop valve F-2 on the pipeline connected to vacuum pump 1; turn the three-way valve 14 of ...

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Abstract

The invention discloses a test method of supercritical carbon dioxide content in coal. A determination device consisting of a vacuum pump, a coal sample tank, a carbon dioxide cylinder, a pressure device and a high-accuracy balance is used in the test method. The test method comprises the following steps of calculating the quantity of gas filled into an adsorption tank by measuring the mass variation of the adsorption tank, substracting the gas phase content increased in a free space of the adsorption tank to obtain the excess adsorption quantity of a coal sample under balance pressure, and calculating the gas phase carbon dioxide content in a coal pore by utilizing a non-ideal gas equation according to the pore pressure. The supercritical carbon dioxide content in coal is a sum of the excess adsorption quantity and the gas phase content of the pore space in coal, tests of a plurality of balance pressures can be finished by measuring carbon dioxide contents in the coal sample under different balance pressures. The test method has the advantages of simpleness and low requirement to an instrument and equipment, can accurately and conveniently measure the carbon dioxide content in coal and is beneficial to test research on the carbon dioxide content in coal.

Description

technical field [0001] The invention relates to a method for testing carbon dioxide content, in particular to a method for testing supercritical carbon dioxide content in coal. Background technique [0002] my country is rich in coalbed methane resources, and the estimated resources are about 43 trillion m 3 . With the increasing demand for energy in my country's economy, the country's demand for natural gas continues to increase, and the development of coalbed methane resources has been highly valued by the Chinese government and relevant industrial departments. However, limited by the low permeability of coalbed methane reservoirs in my country, the coalbed methane mining technology introduced from conventional natural gas mining is limited to a certain extent. Gas injection mining CBM production stimulation technology is an effective means of exploiting low-permeability coalbed CBM resources, which has attracted the attention of researchers at home and abroad. Carbon d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/00G01N7/04
Inventor 吴冬梅程远平安丰华
Owner CHINA UNIV OF MINING & TECH
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