Low catalyst circulation rate leads to clogging in the raw material line
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Gentlemen, the opening degree of the feed valve can only reach 27% – the carbon content in the feed stream is often around 7%, and the density in the feed stripping section is high; as a result, a large amount of catalyst can enter the feed cross tubes, causing blockages. The pressure on the valve drops to zero. What methods exist to increase the circulation rate in order to maintain an appropriate carbon level in the feed stream? Avoid bridging
Generally, it involves mentioning a small amount of stripping steam and the amount of medium used to loosen the various loose points in the raw material line.
Why is the opening degree of your pilot slide valve so small? What is the feed rate? With such a small opening, it shouldn’t cause blockages in the startup horizontal tubes. How much looseness do you have in the startup transfer system and the delivery lines? When the slide valve pressure drop drops to 0, the amount of stripping steam in the raw gas stripping section and the amount of nitrogen supplied can be adjusted to regulate the differential pressure.
It depends on the magnitude of your carbon difference. Generally, it is the circulation rate that determines the size of this carbon difference. If the carbon difference is appropriate, it is possible to reduce the main air flow while still ensuring the production of dimethyl ether, thereby increasing the carbon content in the raw and regenerated materials. According to what you’ve said, the carbon content in the raw material is around 7; typically, the carbon difference is around 6. It seems that the carbon content in your regenerated material is on the low side, and this can be adjusted by increasing the slide valve opening in order to reduce the main air flow
70% load, the loose point has an orifice plate
The load isn’t exactly small either; therefore, your amount of char formation is too low. What is the water content in your methanol, and how much steam is supplied externally? The main air flow can be reduced to minimize charring, and the regenerated carbon should be brought up first.
Reduce main wind speed； Increase the amount of steam used for stripping the raw material, and increase the opening degree of the raw material slide valve