Effect of phosphorus content in Texaco gasification ash on ash melting point and countermeasures
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Due to environmental regulations, Texaco’s gas furnaces have to burn a certain amount of phosphorus-containing solid waste. It is common to find that when too much of this waste is used, large pieces of slag end up in the ash; in severe cases, this has even led to the blockage of the slag discharge outlet. Elemental analysis of the slag showed that the P2O5 content in the large pieces of slag was as high as about 10%. Based on my personal analysis, it is likely that phosphorus increases the ash fusion point of slag; however, there is very little theoretical information on this topic. I am not sure whether this is indeed the case, nor what measures can be taken to reduce the impact of phosphorus. CaO is added as an additive to the coal slurry; recently, attempts have been made to use dolomite as well, since too much CaO can also have adverse effects.
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I don’t know what the proportion of phosphorus-containing solid waste mixed in during combustion is If the furnace temperature is within a controllable range, can it be increased? When starting to mix in the alternative fuel, do so in small proportions first, and gradually increase that proportion while monitoring the operation. There is also sand from the Jiamao Wusu Desert.
I just checked on Baidu; the sublimation temperature of phosphorus pentoxide is 340 degrees. We should consider whether phosphates with a higher melting point were formed, or whether the ratio of silicon, calcium, and aluminum in the ash changed after the formation of those phosphates.
I just checked on Baidu; the sublimation temperature of phosphorus pentoxide is 340 degrees. We should consider whether phosphates with a higher melting point were formed, or whether the ratio of silicon, calcium, and aluminum in the ash changed after the formation of those phosphates.
Phosphates must have been formed; elemental analysis is expressed in terms of P2O5. When searching on Baidu for the melting point of calcium phosphate, many sources state it to be 1670°C; it’s not clear which value is accurate, as I don’t have any authoritative reference books available for checking.
Using a little less of it has no effect, but too little leads to an imbalance in solid waste treatment :( The furnace temperature is very high, methane levels are low, and there is clearly chromium oxide from the furnace bricks in the slag.