Abstract
Content
3.
The main
objectives of the study
5.
The choice of
a control object
In the coal mines of Ukraine with the
increase of mining depth increases
gas content of coal workings, the intensity and frequency of
gas-dynamic
manifestations of sudden methane emissions, which leads to increased
risk in
mining operations. Therefore, in such circumstances the need for
retrofitting
coal mines with new control systems in the concentration of gas
components of
high performance.
The reasons for the large number of
accidents, in particular methane and
dust explosions can be explained by the lack of reliability of the
existing
controls of methane in the mine workings. Methods and Means, which
exist today,
do not provide the necessary speed and accuracy required for measuring
concentration of methane in the atmosphere of coal mines. The methane analyzer
should be
low-inertia with a wide dynamic range and insensitive to the influence
of the
main factors disturbing atmosphere of the mine the coal mines.
Therefore, you
need a detailed study and develop ways to improve performance at the
required
accuracy of control of methane concentration with compensation for the
impact
of major destabilizing factors in the mine atmosphere of coal mines [1].
The
main
objectives of the study:
- Review methods
for measuring the concentration of methane in coal mines and ways to
improve
their metrological characteristics;
- Develop a
mathematical model of the channel measuring the concentration of
methane on the
basis thermocatalytic method using hardware and algorithmic redundancy;
- Develop a
structure of an electronic circuit measuring the concentration of
methane;
- Development of
the measuring channel of methane;
The
choice of a
control object
More sophisticated methods of
measurement based on the use of equipment
with sensors that produce an electronic signal proportional to the
content of
methane in the gas. These devices are more accurate and can be used in
automation systems.
Methane detector SMM–1 is designed for continuous monitoring of methane in the atmosphere, coal mines, dangerous on gas.
The action alarm methane CMM–1 is based on the principle of using thermocatalytic low-temperature point of sensitive items.
Functional diagram of the HMM–1 signaling is shown in Figure 1, where as a standalone power source used in a battery is sealed batteries, consisting of two batteries NKGK–3C.The voltage stabilizer 2 serves for stabilization of supply voltage of the converter 3 and the bridge measuring scheme 5 with sensors 6 entering into it and a methane 7 measuring instrument. Converter 3 is a source of high voltage for the phase-sensitive amplifier 8 and 9 of the alarm. Controlling the degree of battery discharge battery voltage control unit performs 4.
• analyzers of oxide of Sigma-SO-V carbon and DOW.
Figure 2 – The Block diagram of the analyzer of methane of
an AT series
(DMV – remote sensor of methane, PPI – the parameters of the measuring transducer, AC – signaling device.)
List of sources
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Note
When writing this abstract the masterwork hadn't been completed yet. The deadline of completion is December 2012. Full text of the work and materials on the subject-matter can be obtained from the author or her scientific adviser after that date.