Control of fine slag char in space furnaces
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Distinguished leaders: Our facility uses space furnaces, and the standard set by the Ministry of Environmental Protection for the carbon content in the gasified filter cake is ≤40%; moreover, the monthly compliance rate should be above 80%. Unfortunately, we have not met this standard throughout this year. Please, the technical experts working with space furnaces, help us – how do your facilities manage to keep this indicator within limits? Urgent
I guess it’s because the furnace temperature is too low? This results in a low carbon conversion rate and an increased residue content
Does your organization control this indicator?
It depends a lot on the type of coal and the gasification temperature – what kind of coal is being used?
The control target for fine slag is a carbon content of 40%, which is also a bit high.
A residual carbon level of 40% for the filter cake is indeed too strict; 50% is basically normal. Try raising the furnace temperature.
The residual carbon content in my filter cake can be as low as in the teens; it depends on the type of coal used and the furnace temperature – it’s better to keep the temperature higher
Same as above! ! ! At the moment, our priority is to maintain stable production, and the requirements are not strict!
We are Shell gasifiers, with a very high carbon conversion rate of 99.8%; there is hardly any carbon in the slag or filter cake, so there is no need to control this parameter at all
This seems a bit like advertising.
Appropriately increasing the oxygen-coal ratio: Some studies have been conducted on space furnaces, but there are significant variations in their operating conditions. In most cases, either the content of fly ash and carbon residue is too high or the amount of useful gas is too low. There is generally insufficient research on the properties of coal as well as ash and slag.