The issue of gasification temperature in water-coal slurry gasifiers
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There is one question that I still haven’t understood: on what basis is the gasification temperature determined in a water-coal slurry gasifier? I have seen quite a lot of information on this topic; generally, the gasification temperature ranges from 1300 to 1400°C. It is also this gasification temperature that limits the types of coal that can be used (the gasification temperature must be 50°C higher than the ash melting point). Well, thinking inversely, why can’t the gasification temperature be increased? The temperature in powder coal gasifiers can reach up to 1700°C; is it possible to carry out gasification under such conditions in slurry coal gasifiers? If the previous limitation was related to refractory bricks, then with the successful development of gasification furnaces equipped with water-cooled walls, has this limitation been overcome? I hope experts will kindly offer their guidance.
I dare not call myself an expert. The Jinhua furnace also uses the water-coal slurry process; it burns high-calorific-value coal, which requires relatively strict temperature control. The temperature limit still lies in the refractory bricks; by using water-cooled walls in the furnace, the temperature can be increased to 1700
The vaporization temperature is not only limited by the furnace bricks but also related to the downstream equipment and material balance; the capacity of the equipment has limits
The control temperature of the gasification furnace is determined based on the ash fusion point of the coal, at 50–100 degrees Celsius higher than that ash fusion point. The equipment is matched according to the ash fusion point and operating temperature.