Responses to changes in respiratory volume vary:
When a person escapes, the breathing volume is not a fixed value. When running fast, the breathing volume often increases by more than 30L/min. The breathing volume increases, and the human body's oxygen consumption per unit time also increases. When sitting still, the breathing volume is reduced to only 10L/min. At this time, the oxygen consumption of the human body also decreases. Clause 6.19 of EN13794 requires that when the self-rescuer is inspected at 10L/min, its protection time is at least 3 times the inspection time of 35L/min. The MT 425 standard requires that the self-rescuer with a
chemical oxygen self-rescuer with a protection time of 30 minutes sits for 120 minutes. A self-rescuer with a protection time of 45 minutes has a protection time of 180 minutes when sitting still.
The oxygen supply method of the compressed oxygen
Self Rescuer is that after the high pressure oxygen in the gas cylinder is decompressed by the pressure reducer, it flows to the breathing system through the quantitative hole at a specified flow rate to supply oxygen to the human body. When the pressure in the breathing system drops to the specified pressure value, the automatic replenishment valve opens to supply oxygen to the breathing system. At the same time, the
compressed oxygen self-rescuer also has a manual replenishment system. Press the manual supply valve by hand to supply oxygen directly to the respiratory system. The oxygen supply of the compressed oxygen self-rescuer can only be increased and cannot be decreased. The oxygen supply is the flow rate of the quantitative hole. Therefore, the protection time of the compressed oxygen self-rescuer is due to manual supply and automatic supply. It can only be reduced but not increased. Now the protection time is the same as 45 minutes. The two types of self-rescuers are tested under the large breathing volume, the medium breathing volume and the small breathing volume, the protection time and the breathing parameters.
With the reduction of the power of
Chemical Oxygen Self Rescuer, the protection time is extended from 47 minutes to 186 minutes. The protection time of the
compressed oxygen self-rescuer basically does not change with the change of the amount of work, and it is only used for 66 minutes under the small breathing volume of 10L/min. Therefore, for the complex environment in the coal mine, the protection time of the
chemical oxygen self-rescuer is flexible. It can greatly increase the chance of miners escaping. For miners who sit in the rescue cabins and refuge chambers and wait for rescue, compressed oxygen self-rescuers and
Chemical Oxygen Self Rescuers of the same volume and weight have great differences in protection time, and Chemical Oxygen Self Rescuers are more durable. It is beneficial to protect the life of miners. In addition, most of the rescue capsules and refuge chambers now use compressed oxygen as the oxygen source. As a beneficial supplement to compressed oxygen and a backup between different oxygen sources,
Chemical Oxygen Self Rescuers are equipped in rescue capsules and refuge chambers. Indoors can more effectively protect the life safety of miners.
