How to adjust the load of multi-nozzle gasification device
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The coal slurry flow rate is easy to control, and the coal slurry used for the counter-injection burner comes from the same high-pressure coal slurry pump. What to do with oxygen flow? If the relative burner flow rates are unequal, will it cause partial spray?
I think oxygen can be easily adjusted using a high-precision regulating valve. On the contrary, it is relatively difficult to adjust coal slurry. Especially with the wear of the valve core, the flow of coal slurry into the furnace becomes increasingly inaccurate, which can easily cause partial injection.
In fact, if a regulating valve is used to regulate coal slurry, it will no longer work. Generally, a variable tone adjustment is used.
With the continuous wear of the burner, it may be difficult to accurately adjust the coal slurry flow rate only by using a coal slurry regulating valve. Would it be better to use a coal slurry pump and a regulating valve, but the investment will increase.
The oxygen flow is adjusted by the regulating valve, and the coal slurry flow is adjusted by the coal slurry pump.
Yes, the flow adjustment of coal slurry is achieved by adjusting the speed of the coal slurry pump, not the coal slurry regulating valve mentioned on the second floor.
The Yankuang Cathay gasification workshop uses my country's first set of multi-nozzle opposed gasifiers (with the exception of Hualu Hengsheng, which has Texaco furnaces. It was originally envisioned to use multi-nozzles as a backup furnace, but the operation has not improved). It has been running for three years. The above-mentioned oxygen and coal slurry adjustment problems will affect the problem of partial injection. I can say that it is possible, but it will not affect the operation of the gasifier at all.
The original poster's concerns are justified. But as far as I know, during the actual operation of the four-nozzle gasifier, there will be no partial injection caused by fluctuations in coal slurry or oxygen flow. A coal slurry pump is divided into two counter-injection burners. The coal slurry flow rate is currently adjusted by frequency conversion, so there is no need to worry. ； As for the oxygen flow, generally speaking, a relatively precise regulating valve is used to adjust it, and the error will not be too large. Even if it is larger, it will not directly erode the furnace bricks after being ejected from the burner and then colliding in the furnace. Moreover, when the oxygen flow rate here fluctuates at 5% and the coal slurry fluctuates at 12%, there is no partial spray in the gasifier, let alone better equipment.
Wouldn’t it be nice to ask East China University of Science and Technology?
In fact, the Texas four-nozzle gasifier is still operating very well. In terms of indicators, it is better than Cathay Pacific. The dome life can reach more than 7,000 hours. That still does not change the aspect ratio. How can you say they are not making progress? Haha, it is better to be modest, otherwise it will make people laugh.
East China University of Science and Technology has conducted cold-state tests. When the coal slurry flow rate of the symmetrical burner is not much different, it will not affect the atomization collision effect. However, if it runs with a large flow deviation for a long time, it is uneconomical. It is best to stop and replace the burner. Four-nozzle gasifiers generally use a four-cylinder double-acting coal slurry pump to supply coal slurry to two symmetrical burners. If the coal slurry pump fails to measure the single cylinder, it should be dealt with as soon as possible.
If a coal slurry regulating valve is used, the life of the valve will not be long.
Haha, it is indeed acceptable to be a little off. Think about it, the alignment of the nozzles is not that easy. It is difficult to achieve 100% in the laboratory. There may be practical methods on site. In addition, four nozzles are used instead of two. In theory, the more nozzles, the smaller the impact of misalignment. To be more whimsical, the four nozzles at the bottom of the analog shell are deliberately misaligned, causing a certain amount of swirl. In fact, the flow field formed inside the gasifier with four nozzles will also have swirling flows, which increases the residence time.
What is the impact of the swirl field nozzle flame?
The key is the amount of oxygen fed. If there is a deviation in the amount of coal slurry, or the deviation is large, as long as the amount of oxygen does not differ greatly, the impact can still be guaranteed in the center of the furnace. Otherwise, the flame will reach the gasification furnace wall. According to the principle of momentum transfer, it is mainly the amount of oxygen that determines the location of impact.
Generally, the coal-water slurry flow rate is adjusted through the rotation speed of the coal slurry pump.