Peroxide issue

If the oxygen-to-coal ratio is the same, it should be a water quality issue; only a small amount of water breaks down at high temperatures. I’m not sure if it’s correct; please advise

The temperature in the wash tower isn’t very high either; it’s around 160 degrees. How could an oxygen explosion occur then?

Everyone is welcome to participate actively in the discussion. Generally, peroxide explosions occur in water scrubbers, as they will definitely react at the high temperatures in the gasifier. In the water scrubber, within the explosion limit range of water gas, and in the presence of oxygen along with a certain heat source, an explosion takes place. The question I asked still hasn’t received a good explanation

If a peroxide explosion might occur, I believe the only possible reason is this: in an ultra-high-temperature environment like a gasification furnace, water vapor is added, and due to the high temperature the volume of water vapor expands significantly, resulting in a high volume percentage of it in the gas; accordingly, the volume percentage of residual oxygen becomes lower. However, after rapid cooling and subsequent washing, under high pressure and relatively low temperature, almost all of the water in the gas is cooled and separated from the gas phase, which is equivalent to changing wet gas to dry gas. With the total amount of residual oxygen remaining unchanged, it is possible for the wet gas with a few thousandths percent residual oxygen at the exit of the gasification furnace to turn into dry gas with a few percent residual oxygen after washing. Residual oxygen becomes concentrated during this process until it reaches the explosive limit. The mechanism should be the same as that in the urea production process, where a small amount of H2 introduced into the CO2 can cause an explosion in the high-pressure exhaust system! This is just my personal opinion; I welcome everyone’s feedback! :) :) :) :handshake :handshake

It’s almost impossible; can water be split? The chemical bond in H2O is quite strong; if it could be broken easily, we wouldn’t need to go through the hassle of gasification to produce hydrogen. We have only heard of water electrolysis and the decomposition of water by organisms. This post was last edited by jensse on 2009-4-22 10:45]

Yeah, water splitting is impossible; it must be some other reason

It is caused by oxygen getting in

The flash explosion occurs because the accumulation of oxygen in the scrubber tower reaches the explosive limit of a certain flammable gas; it’s not that the presence of oxygen always leads to an explosion – it is merely a necessary condition. Furthermore, the H-O chemical bond is not absolutely strong; water can be partially decomposed during vaporization, with a certain degree of decomposition of water vapor. The decomposition rate I calculated is around 26%. Last edited by GSP on 2009-4-22 10:08]

Peroxide starts first from the peroxide in the gasification furnace, and the oxidation reaction proceeds quite vigorously; since the gasification furnace is the reaction vessel, its temperature rises. As the temperature rises, the volume of the gas increases; in other words, the volumetric flow rate of the gas exiting the vaporization furnace goes up. At the same time, the high-temperature process gas carries away more water vapor, further increasing the volumetric flow rate of the gas. This causes some of the oxygen that has not had time to react to be carried into the scrubber. Since the scrubber is not a reaction vessel, oxidation reactions occur there between the oxygen and carbon monoxide and hydrogen present in the process gas, resulting in an even higher temperature of the process gas and an increase in its volume – which is what leads to an explosion ； Another possible cause of the explosion is that the high flow rate of gas blows over the tray plates, creating an illusion of an “explosion”!

A gasification furnace cannot experience a chemical explosion, as an open flame is present; however, if there is an excessive amount of peroxide, it can cause the temperature inside the furnace to rise extremely high, leading to a physical explosion. However, there have been instances of explosions (due to peroxides) in scrubbers. However, the analyses provided by the manufacturers that experienced explosions were quite vague; the people involved surely knew where the problem lay in the operations, but they refused to say so. I think the explosion must have occurred because the gases were not properly mixed before driving; during driving, gas and oxygen combined thoroughly in the scrubber tower, and the flow of gases generated static electricity or excessive flow rates that damaged the trays, resulting in a spark explosion.

Due to the furnace temperature reaching up to 1000°C, an excess amount of oxygen in the furnace will only cause the temperature to rise further, eventually leading to the melting of the ash and slag; it is impossible for the oxygen level in the tower to become excessive.

Firstly, the oxidation reaction is an exothermic reaction. In the presence of peroxides, the temperature in the vaporization furnace rises to 1300 degrees Celsius; such high temperatures are not favorable for exothermic reactions (as high temperatures favor endothermic reactions). Therefore, it is possible that some oxygen does not react completely. Also, at high temperatures, it is difficult for the compound to exist in a stable form. When looking at coal coking, coal liquefaction, and the formation of coal, it is important to understand that compounds can undergo decomposition at certain temperatures; just as in the sun, hydrogen and oxygen exist as water vapor, or as hydrogen and oxygen atoms and ions?

The poster’s question is good; after the combustible gas in the vaporization furnace burns, excess oxygen enters the subsequent system, causing an explosion.