Problems in water-coal slurry gasification process
Thread Content
During the normal operation of a water-coal slurry gasifier, what does the slag look like and what is its color? (Hope a picture can be attached) This post was last edited by Langtaosha on 2008-11-5 00:50]
5% of them are fried in soybean-sized pieces; the rest are in granular form and appear black in color
Under normal conditions, particles the size of soybeans account for 30-50% of the total residue amount. The rest is fine slag; a small number of larger particles are allowed, but generally particles larger than those the size of steamed buns are not permitted ； The normal color should be shiny on the surface, appearing grayish-white. The granular beans are very crisp; they can be crushed with your fingers, and they are hollow on the inside ； If large pieces of slag appear, which are hard in texture and dark in color, it indicates that the operating temperature of the furnace is too low; this is dangerous, and adjustments must be made promptly, otherwise the furnace will have to be shut down due to the inability to remove the slag ； If there are no particles, it’s possible that the temperature of the furnace is too high; in such cases, the color turns white ； It’s possible that the load is too low, resulting in poor atomization ； It’s also possible that there is a problem with the burner – low pressure difference, poor atomization, inadequate combustion, and so on. Regarding the above issues, people also express different opinions
Brothers, do you have any other good ideas? Share them with us
Unlike the slag from fixed-bed furnaces, I’ve learned this; it seems I need to study more about slag
No way. From my observations, the slag produced by our factory comes in a variety of colors – yellow, green, black, and gray. There was a period when slag with white spots appeared; it seemed normal at first glance, but overall those spots were present on the slag, and it is said that this is caused by changes in the quality of the coal used. Due to the presence of a slag crushing machine in our factory, slag particles of fist size are virtually never seen; those the size of a thumb are also very rare. The slag is mainly in a fine form, with only a small amount of particles the size of soybeans~
Since the coal quality varies from place to place, the slag will naturally differ as well; it is necessary to observe more cases in order to identify patterns.
Black is the dominant color. If the furnace temperature is set too high, it will turn somewhat yellow or green. So far, no white ones have been found. I don’t know what the components of the white substance are. I would appreciate your advice as well