Aerospace carbon dioxide coal transportation
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What medium is used for transporting carbon dioxide in aerospace systems, and what impact does it have on the production system?
Carbon dioxide-based coal transportation makes use of dense-phase transport of carbon dioxide (powder transport), and this has no impact on the gasification process; generally, nitrogen is used for transportation when there is no CO2 available.
You yourself said it’s carbon dioxide used for coal transportation – so why ask what medium is employed? In pulverized coal gasification, inert gases are generally used for the dense-phase transport of pulverized coal, with CO2 or N2 being the most common choices
In CO2 pneumatic conveying, the CO2 content in the crude syngas is relatively higher than that of N2. When using N2 for conveying, ammonia is generated, which can have an impact on downstream equipment; therefore, ammonia removal is necessary, otherwise blockages are likely to occur
Similar to Shell gasification, nitrogen was used for transportation at first, before switching to carbon dioxide
Normally, nitrogen is used at the start of operation; once purification is functioning properly, CO2 is used for delivery instead
Can methanol-washed exhaust gas be used as a coal transport medium?
The exhaust gas coming out of the exhaust gas scrubber is not satisfactory, while that coming out of the desorption tower is acceptable
Could you share some specific experiences? Thank you
That’s how all the current patent holders for powder gasification design their systems; just ask the patent holders and you’ll find out
It’s mainly to ensure the quality of its carbon dioxide