The necessity of central oxygen level control in Texaco water-coal slurry pressurized gasification
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·In Texaco’s pressurized gasification technology for water-coal slurry, the amount of oxygen at the center is generally kept at 15–20% of the total oxygen supply. The adjustment of this oxygen level has a significant impact on both the reaction time in the gasifier and the position of the flame in the gasification zone. Please discuss the effects of adjusting the oxygen level at the center on the flame position in the gasification zone, on the composition of the syngas, and on the service life of the refractory bricks.
The amount of oxygen at the center is not the same in all locations. Texaco designs the size of the burners based on the type of coal available locally; therefore, adjustments to the amount of oxygen at the center need to be made by comparing it with the data provided by Texaco and taking into account the type of coal used by one’s own company. Gradually, a suitable value for the oxygen level at the center can be determined. The high-temperature zone should be located in the upper middle part of the straight cylindrical section, but not too close to the dome.
Please pay close attention to the discussion content! ! It is not about discussing the specific opening degree of the central oxygen valve, but rather the impact of adjusting the amount of central oxygen on the flame zone of the gasification furnace, as well as its effects on the refractory bricks used at the nozzle, the gasification reaction time, and so on
It is usually 15%–20%. It depends on the adjustment of the effective gas output
There is also the impact of coal quality. In fact, the effect of central oxygen on the flame should be parabolic in shape. Let’s start with the cardiogenic effect, which is intended for nebulization. Too much central oxygen results in a too-long flame, causing excessive wear on the bricks at the base of the cone; too little central oxygen leads to a large injection angle, causing the hot spot to move upward and making it easy for the crown to overheat. However, when the size of the central oxygen and the size of the injection angle are not in a simple direct or inverse proportion, it can only be said that there is an inverse proportion within the range of 15% to 20%; this is why I say it should be a parabola. Just my personal opinion; for reference only!