Regarding the issue of ammonia causing activated carbon particles to burn
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Gentlemen, organic exhaust gases contain large amounts of ammonia (at a concentration of about 2 grams per cubic meter). In the activated carbon canister, the activated carbon particles have a certain level of humidity, and the temperature is around 60 degrees Celsius. Carbon particle combustion occurs when exhaust gas and air are introduced simultaneously. Under these conditions, an exothermic reaction occurred with ammonia – was the combustion caused by ammonia?
Ammonia decomposes at high temperatures to produce hydrogen, but it does not decompose at 60 degrees. Activated carbon will burn if exposed to a flame. In fact, it burned, which may be related to the gas flow rate. When the flow rate increases, friction causes a fire.
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The adsorption of gases (organic or inorganic) by activated carbon is an exothermic process. If the gas flow rate is too high or the concentration of the components to be adsorbed is too high, and if heat conduction through the activated carbon bed is poor, it can lead to the accumulation of heat in the activated carbon and subsequent combustion – this is a common accident; it has nothing to do with friction with the gas or reactions with ammonia
Could it be caused by the combustion of organic gases in the exhaust fumes? It is caused by combustion on the surface of activated carbon.
It seems that when activated carbon is used to absorb propane from the air, fires can also occur. Does ammonia exhibit this phenomenon in particular? Should ammonia be pre-removed from organic exhaust gases? There are many methods for removing ammonia nitrogen from the gas phase, including absorption with water, absorption with acidic absorbents, membrane absorption, and so on. We deal with membrane absorption.
I agree with the view from the 4th floor; the activated carbon here has also caught fire, mainly due to heat generated when the activated carbon absorbs substances. To determine whether activated carbon has become ineffective, one also checks whether it generates heat; if it no longer produces heat, it means it has become saturated. When this is introduced together with air, there is oxygen present; activated carbon will definitely burn once it reaches a certain temperature.
Activated carbon is itself a self-igniting substance, and it can be classified according to hazardous materials regulations. At certain temperatures and humidity levels, activated carbon can catch fire on its own due to the oxygen it has absorbed and accumulated; it is necessary to be careful when storing it. This seems to have little to do with ammonia – at least I don’t think there’s much of a problem
Activated carbon is itself a self-igniting substance, and it can be classified according to hazardous materials regulations. At certain temperatures and humidity levels, activated carbon can catch fire on its own due to the oxygen it has absorbed and accumulated; it is necessary to be careful when storing it. This seems to have little to do with ammonia – at least I don’t think there’s much of a problem
Activated carbon has very high reactivity; even in the absence of organic matter, it will burn in the presence of oxygen when exposed to a fast-flowing stream of air. It’s best not to let air in.