Übersetzung für "Obere explosionsgrenze" in Englisch

The upper explosion limit is usually exceeded for flammable liquids with a low flash point (e.g. in a car petrol tank).

This means that the lower explosion limit may be lower and the upper explosion limit higher.

No explosion occurs if the gas or vapour concentration exceeds a maximum value (the upper explosion limit).

The lower and the upper explosion limits are those limits of concentration of the flammable gas in admixture with air at which propagation of a flame does not occur.

The explosive range is approx. between 6.2% by volume as the lower explosive limit and 12.3% by volume as the upper explosive limit.

A bypass conduit is merely provided parallel to the reactor container, said bypass conduit being able to be opened and closed by way of suitably arranged valves and through which the hydrogen gas produced by the electrolyzer is diverted until the upper explosion limit is exceeded.

Alternatively, the upper explosion limit can however also be determined by way of the measurement of the oxygen content in the hydrogen gas flow.

These two limit values are the lower explosive limit and the upper explosive limit, the range of combustible gas content lying between them is the explosive region (ignition region).

The lower and the upper explosion limits are those limits of concentration of the flammable gas in admixture with air at which propagation of a flame does not occur.

3.The range between the explosion limits is widened at elevated temperatures and pressures.This means thatthe lower explosion limit may be lower and the upper explosion limit higher.

The range of flammability is the range of concentration between the lower and the upper explosion limits.

This is why the liquefaction generally requires special purification steps for removing the hydrogen, or precautionary measures to avoid the range between the lower and upper explosion limits with the lowest possible risk.

Initially, therefore, combustion is prevented, since there exists neither a combustion gas and air mixture lying between a lower and an upper explosion limit nor the necessary ignition temperature.

In a second process step, oxygen is then metered in and, at the same time, the contents of ammonia and methane are adjusted such that the mixture is situated above the upper explosion limit and the catalyst temperature corresponds to within 50 K of the reference temperature determined in step 1 .

If the O 2 /NH 3 or O 2 /CH 4 educt ratios (vol/vol) of the starting gas are not adapted to the degree of enrichment with oxygen, the NH 3 /CH 4 /N 2 /O 2 mixture is not sufficiently far from the upper explosion limit, and safe operation of the reactor is no longer assured.

The limit line of the Upper Explosion Limit is shown for information only, and also not to scale.

After exceeding the upper explosion limit, the first valve 5 which is arranged in the bypass conduit 11 is closed, and simultaneously the second valve 6 which is arranged in the feed conduit 8 to the reactor container 3 is opened, so that the hydrogen gas flow flows through the reactor container 3 .

A temporally controlled flushing with hydrogen gas with a fivefold flushing quantity of the rated volume of the feed conduit 8 is carried out so as to safely exceed the upper explosion limit.

Preferably, the first valve is closed and the second valve is opened, on exceeding the upper explosion limit of the hydrogen in the hydrogen gas flow, so that the hydrogen gas flow is led to the reactor container.

The exceeding of the upper explosion limit according to the invention can be determined by way of the measurement of the oxygen content in the conduit leading to the reactor container.

During this, other system subassemblies are flushed with hydrogen until after the mentioned exceeding of the upper explosion limit hydrogen is then also introduced into the reactor container.

All the same, the concentration of the flammable material in the air mixture must lie between the lower and upper explosion limit.