Примеры использования Methane concentration на Английском языке и их переводы на Русский язык
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Methane concentration at well mouth.
Production had to be curtailed in 2001 to avoid dangerous methane concentrations.
Due to its high methane concentration, biogas is a valuable fuel.
Table 2.1 SelectedExamples of Regulatory and Advised Flammable Methane Concentration Limits.
Historically, methane concentrations of at least 30% were required.
Flow rates are between 666 and 6685 m3/min and methane concentrations of 0.1- 0.5% by volume.
The methane concentration of the gob gas is 50-60% and the flow rate of methane is between 1,325 and 6,000 m3/day.
National regulatory agencies set maximum limits for the methane concentration in underground airways.
While the methane concentration in ventilation systems is generally below 1 per cent of air by volume,methane in drainage systems can range from concentrations in single digits to almost 100 per cent.
Development of the methods for experimental evaluation of areas with high methane concentration according to data of in-seam seismic surveying.
Firstly, a maximum permissible airflow of 25 m3/s across the longwall coalface could only dilute a maximum gas inflowof 0.37 m3/s(22.2 m3/min), despite a relaxation by the mining authority which raised the maximum permitted methane concentration from.
Deterioration of drainage performance leads to rapid increases in airway methane concentrations assuming that the total ventilation air flow into the mine remains constant.
The amount captured between 1982 and 1984, a period of approximately three years,was 9 million m3 average flow rate 6.5 m3/min; methane concentration as high as 70.
For example, gas engines have a narrow band of acceptance of methane concentration, and an assured and consistent gas flow will increase the efficiency of the engines while reducing operating and maintenance(O&M) costs.
In recent years,combustion engines have begun appearing in the marketplace that are capable of using mine gas with methane concentrations less than 30.
For a project to be attractive(notwithstanding the other variables mentioned above) methane concentration in the ventilation air must usually be above 0.5% CH4 to be even considered as a viable project.
The global flow of methane in the composition of atmospheric precipitation andits influence on the formation of methane concentrations in aquatic ecosystems.
The high costs associated with purifying drained gas to improve the methane concentration for a particular end use can often be avoided by improving underground methane drainage practices.
Best practice is to make arrangements for the supply of electricity to be cut off from all working places downstream of a working place in which the methane concentration has exceeded the statutory maximum.
In this paper the author considers the questions regarding peculiarities of formation of methane concentrations in precipitation; estimation of the global flow of methane in the composition of atmospheric precipitation and the effect of the latter on the level of methane in aquatic ecosystems.
Unlike the lean fuel turbine approaches, it does not require supplemental gas to increase the methane concentration of VAM to sustain operations.
Current VAM technologies are generally not able to process methane concentrations below 0.2% without use of additional fuel, but research efforts are underway to lower the concentration threshold because VAM concentrations at many mines worldwide fall below 0.2.
The most commercially andenvironmentally attractive projects internationally are those where the methane concentrations from the ventilation shaft are highest.
Generally, when measures should be taken to control high methane concentration(for example, the methane concentration exceeds the specified level), the coal production per shift at the high gas coal face is only 60% of that under normal conditions, and the face productivity will be reduced by about 30.
Depending on the VAM concentration, these turbines may use VAM for over 80% of all fuel if methane concentrations are high, or less than 20% with low VAM concentrations. .
Methane concentrations measured on seawater by pulsed discharge helium ionization detector were not high. Environmental baseline monitoring included physical parameters such as conductivity(i.e. salinity), temperature and depth of the seawater, and biological parameters such as zooplankton, phytoplankton and photoautotrophic picoplankton biomass and concentration profiles of Chlorophyll a.
Table 1 shows that the application andviability of the different options depends on the methane concentrations in the ventilation air and on other site- specific situations.
There is growing interest in the use of low-quality CMM recognizing that in many countries, especially developing countries andeconomies in transition, the methane concentration in the gas drainage systems can be below 25 per cent.
Usually, regulations prohibit the use of electricity in specific roadways within a longwall district where elevated methane concentrations could arise or wherever concentrations near the flammable gas limits(i.e., exceeding 1% methane) is permitted.
The early coal and gas outburst hazardous areas identification during mine headings development The last occurred coal and gas outbursts analysis showed that some hours before the sudden outburst(from 2 up to 24 hours)the abrupt jump of methane concentration happens of the return air flow in the developed headings from some minutes to some hours.