How to judge the operating conditions of Texaco gasifier based on ash and slag
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Generally speaking, the shape of gasifier ash can directly reflect the operating conditions of the gasifier. To accurately judge the operation of the gasifier, a comprehensive judgment must be made based on years of practical experience and various relevant parameters displayed on the DCS. Under normal circumstances, the particle size of ash and slag is 3-5mm, and the proportion of 50%-70% is relatively good. If the particle size is too small (or fine) or too large (or lumpy), you should check the oxygen-to-coal ratio, coal slurry concentration, process gas composition and temperature, which can indicate that the furnace temperature is too high or too low, and can be adjusted according to the actual situation. ； If needle-like ash appears, there are two situations: one: Black short thick wire indicates that the furnace temperature is on a downward trend and it is necessary to increase the furnace temperature in time. ； two: Hair-like filaments indicate that the situation is serious. One is that the furnace temperature has been low for a long time, causing slag to hang on the slag outlet (most downcomers also have slag hanging). At this time, the temperature must be slowly raised and the load reduction operation must be assisted. ； The second is that the furnace temperature is controlled or adjusted too quickly during operation, resulting in a large increase in the ratio, causing a large amount of slag on the furnace wall to melt and cause slag to hang. In any case, adjustments must be made slowly and not too hastily. If relatively broken or fine sand appears, comprehensive judgment and post-processing must be carried out based on coal quality analysis and central oxygen content. In short, no matter what kind of ash it is, it must be comprehensively judged based on the gasifier parameters, coal quality, coal slurry and ash conditions before it can be effectively adjusted.
I strongly agree. Coal slag is an important basis for judging the operating status of gasifiers. The current theoretical model of gasifier operation is not very complete. The establishment of empirical models is an important guarantee for the safe and stable operation of gasifiers. I hope that everyone who has rich operating experience in gasifiers will not hesitate to write and discuss it together! ! :victory:
Thank you very much to the original poster. The coal slag you mentioned above should come from the slag crusher. I wonder if there is no slag crusher, can it truly reflect the situation of the gasifier?
The author's analysis is very good, I learned a lot* I would like to add that the operating conditions of the gasifier can also be seen from the combustible materials of cinders, whether the amount of oxygen is appropriate, and whether the temperature in the furnace is properly controlled. Although it is a final judgment, it is also helpful for operation.
It is indeed the ash coming out of the slag breaking machine, because most gasifiers are now equipped with this equipment. Although the original design of the multi-nozzle gasifier currently developed by East China University of Science and Technology does not have this equipment, it still has a reserved port. It is said that the four-nozzle gasifier currently used by Shandong Hualu Hengsheng has also installed a slag breaker, and the effect is said to be better than before.
Hello, thank you! The combustible matter of coal slag (ie, the carbon content of the residue) can not only judge the operation of the gasifier, but also is an important indicator reflecting the efficiency of gasification.
The poster's information is very fragmented. I don't know where I picked it from. I hope I can post a complete version.
Normal cinders should be glassy； If needle-like ash appears, consider whether the slag outlet is blocked and check the pressure difference at the slag outlet promptly. ； If the conversion rate of coal slurry decreases and the carbon residue content of coal slag is high, the oxygen flow rate must be checked promptly, contact the air separation to confirm that the oxygen purity is qualified, and determine whether the burner atomization is not good, etc.
Regular observation of the ash and slag of the gasifier is one of the main means of operating conditions of the coal-water slurry gasifier, but it is only a lag adjustment means of furnace temperature control. During the operation of the coal-water slurry gasifier, it is necessary to gradually explore the advanced adjustment of the furnace temperature and gasifier operating conditions according to the actual situation of each company. Only in this way can the operation of the coal-water slurry gasifier be controlled in your own hands, and you have the final say on what kind of slag the gasifier produces. Give it a try!
Although the slag can respond to the furnace temperature, it still lags behind and cannot respond in time. At this time, appropriate adjustments should be made based on the working conditions of the furnace at that time. I think gas composition analysis can reflect the furnace temperature in a relatively timely manner.
Analysis and observation of gasifier slag can obtain first-hand information on gasification operation, and it is also the most reliable. The analysis speed is too slow, and the data obtained may not be accurate. The time delay is too long, and the reference is not great. However, after a long period of observation, analysis and judgment of the coal slag, it can be ensured that the gasifier is operating in the best condition.
How do changes in coal quality affect slag and technology?
Judging solely from the ash and slag is somewhat one-sided, because the difference between the ash and slag in the early and late stages of burner operation is relatively large.
What everyone said is very reasonable. I will learn from it.* Yes, ash and slag are also the eyes of coal gasification operation conditions. Can it also reflect the condition of the slag breaker?
Very good, it would be better if you have complete information. Learn* .
No matter what kind of ash and slag it is, it must be comprehensively judged based on the gasifier parameters, coal quality, coal slurry and ash slag conditions before it can be effectively adjusted. Could you please give me a detailed explanation of the first floor?
It has been a long time, I believe you have experienced it in actual production! In fact, many things on Haichuan are not picked from here and there as you think. Many things are not found in books and materials at all. They are summarized from actual production and practice. This is why many schools, research institutes, and even design institutes now want to communicate with front-line production personnel and technical personnel.