Coal quality analysis for water coal slurry
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Gentlemen, take a look and see if this kind of coal can be used for water-coal slurry gasification? The average ash fusion softening temperature (ST) is 1350–1500 degrees; the average lower heating value on a dry basis is 21.64–25.43 MJ/kg. The ash content ranges from 21.29% to 27.4%, while the volatile matter content is between 38.65% and 41.64%. The total sulfur content is 0.57% to 1.33%, and the average moisture content is 3.35% to 4.28%. The analysis conducted by the Northwest Research Institute is too slow – could you recommend any other authoritative testing institutions? Thank you
The ash content is too high, making it unsuitable for water coal slurry. The suitable coal type for water-coal slurry is young bituminous coal with low ash content and low ash fusion point.
Coal qualities that cannot be used for water-coal slurry: first, the ash fusion point is too high; second, the ash content is too high. Coal with an ash content exceeding 18% is not suitable for use in water-coal slurry gasification.
Personally, I don’t think it’s suitable; a ash content of 21.29–27.4% is too high and not appropriate.
It is not suitable for use in water-coal slurry, as its ash content and ash melting point are very high; if a flux is added, the ash content will be even higher.
It is not suitable as coal for water-coal slurry, due to its high ash fusion temperature and high ash content. The Slurry Center of the China Coal Research Institute can conduct coal quality analysis and evaluation.
It has a high ash fusion temperature and high ash content. Vaporization of the water wall can be considered.
It has a high ash melting point and high ash content, making it unsuitable for water-coal slurry gasification. I also wonder how the pulping quality is?
Regarding coal quality analysis, in addition to the tests conducted at specialized coal research institutes, some coal-related universities should now also have the appropriate analytical instruments and equipment, allowing them to complete the analyses more quickly.
I found out that tests can be done in Weihua – I was wondering if that’s possible?
High ash melting point and high ash content make it unsuitable for water-coal slurry gasification; high volatile matter poses a significant risk during the pressurized gasification, transportation, and storage of dry powder
Can water-coal slurry be used if the ash content is reduced to around 10% after coal washing?
It is recommended to conduct washing and sorting first, followed by a coal quality analysis, to determine whether it is possible to produce water-coal slurry. After washing and sorting, the ash melting point, calorific value, ash content, volatile matter, total sulfur, and moisture content of coal all change on average.
As mentioned above, it has a high ash content and a high ash fusion point, making it unsuitable as coal for water-coal slurry gasification. I wonder where the original poster’s workplace is? If necessary, it can be done at the Xi’an Thermal Engineering Research Institute, which is also an authoritative institution. The cost for a comprehensive analysis of each coal sample is around 9,800 yuan (there are also separate pricing options). A contract needs to be signed, and the processing time is about two weeks. The institute is located to the south of Xijing Hospital, on the west side of the road. Of course, you can also contact the Weihua Quality Inspection Center; the price will be lower and the processing time will be shorter. If needed, please leave a message; I can provide contact information. This post was last edited by yzhaown99 on 2009-3-15 18:37.]
The ash content is high; when a cosolvent is added, the ash content becomes even higher. Water-coal slurry can also be used, but it results in high oxygen and coal consumption. There is a lot of slag, the lock hopper needs to be larger, which increases equipment investment; furthermore, frequent slag discharge imposes higher requirements on the material of the valves. The pressure in the ash treatment system also increases, and this is mainly due to inefficiency; when there is too much ash, the operation of the furnace becomes very unstable
To use the water-coal slurry gasification technology, it is necessary to wash and refine the raw coal; an economic analysis must be conducted to determine the desired level of ash content. It is not clear whether the moisture present is internal moisture – if so, and if its level is high, the concentration of the resulting coal slurry will not be very high. Which gasification technology to use depends on the specific circumstances. If one has its own coal mines, the cost of washing the coal is even lower than that of purchasing raw coal from outside; then why not use the water-coal slurry technology?