Design principles for the size of the gasification furnace slag outlet
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What are the design principles for the size of the slag outlet in a gasification furnace? Reducing the size of the slag outlet increases the residence time of the reactants while still ensuring proper slag removal; is it meaningful to reduce the slag outlet size appropriately?
It doesn’t matter much; if the slag notch bricks aren’t properly installed, their lifespan will be shortened, which is a minor issue. But if the downcomer gets pierced, it will be far more costly.
Reducing the slag outlet size may increase the risk of blockage at the slag outlet during slag discharge
Load at the vaporization furnace, system pressure
The slag outlet narrows and the residence time increases; at the same time, changes occur in the three reaction zones within the furnace. After narrowing, the velocity of the gas at the slag outlet rises. With the same ash melting point and operating temperature, less slag will accumulate at the slag outlet, and changes in the flow pattern will also affect the amount of slag that adheres to the refractory bricks inside the furnace. Taking the taphole blockage as an example, a reduction in the taphole size leads to an increase in effective gas volume. However, what’s crucial is whether the carbon conversion rate truly increases and whether the coal consumption per ton of product produced in the subsequent system decreases. If not, abnormally high levels of carbon monoxide will impose a heavy burden, preventing the upstream system from operating at full capacity.