Issue of continuing pressure increase in pulverized coal gasification at 4.0 Mpa
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Currently, the pressure for powder coal gasification is generally 4.0 Mpa. Please share your views on the potential impacts of increasing this pressure during design If it can be increased, to what pressure can it be raised?
They are basically all 40 kilograms in weight. The pressure needs to be increased to 65 or 87 kilograms, similar to what is used in coal water slurry systems. It doesn’t seem to be a problem with whether the gasifier can operate; the gasifier functions fine. The problem might lie in other aspects, such as the gas used for transportation. Currently, the pressure is 40 kilograms, and the gas required for transportation is over 70 kilograms as well; moreover, the volume of gas is significant. If the pressure were increased to 65 kilograms, then 100 kilograms of gas would be needed for transportation. How much more power would be required for compression in that case? Of course, this is just one aspect of it. I don’t think the pressure level is too high; the problem still lies in the coal powder transportation.
I agree with the view above; moreover, the higher the pressure, the more difficult it may be to control the coal powder transportation.
The main issue lies in the transportation of coal powder, which is also a key focus of research on various coal gasification furnaces. If the pressure is increased, what effects will that have on the transportation of coal powder? I hope everyone can analyze it. Additionally, the selection of the gas used for transporting coal powder is also an issue; if CO2 is chosen, the problem of throttling must be taken into consideration relative to its critical point.
As mentioned, if CO2 is chosen as the carrier gas, it is already very close to its critical state at current pressures of over 70 kilograms; increasing the pressure further would likely render CO2 unsuitable as a carrier gas. Furthermore, an increase in pressure poses many difficult-to-overcome challenges to the stability of dense-phase transportation
I feel the pressure is increasing, and it’s more difficult to control the amount of air used to convey pulverized coal
It would be great if solid-state pumps could be developed. I wonder what the progress on their development is at the moment?
The pressure is determined by the downstream side; it is designed according to the amount required there. If a higher pressure is required, then consider the issue of gasification supporting equipment.
If the problem of transporting pulverized coal isn’t resolved, it will be difficult to use; if solid transportation is possible, then the framework wouldn’t need to be this tall