Deutsche Gasification Furnace Slagging and Refractory Bricks
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I would like to ask the experts: how can one determine whether there is slagging in Texaco units? In which cases is it permissible to continue operating, and in which cases must the furnace be shut down? Does the thickness of the slag deposit have an impact on refractory bricks? Is coal with 15% ash content considered to have high ash content, and what impact does it have on the operation of gasifiers? . . . Seeking advice!
Theoretically, there are requirements regarding the thickness of the slag layer; the functions of this slag layer are obvious: firstly, it prevents high-temperature syngas from leaking into the gaps between the refractory bricks, thereby avoiding excessive temperatures on the furnace walls; secondly, it reduces the wear on the refractory bricks, achieving a self-protective effect through the use of slag. Under the same operating conditions, the area where the arch top of the gasifier contacts the cylinder, as well as the bricks at the base of the cone near the slag outlet, experience significant wear. The shutdown mentioned upstairs likely refers to the situation where, as the refractory bricks in the gasification furnace thin out, the temperature of the furnace wall rises above the acceptable level; in such cases, it is necessary to consider shutting down the furnace. In normal production, the thickness of the slag layer on the refractory bricks is determined by the color of the slag. Generally, if the slag appears yellow-green, it indicates that the furnace temperature is high and there is less slag layer; in such cases, it is necessary to adjust the furnace temperature promptly. If the operating temperature of the gasification furnace is too low, more slag will accumulate on the refractory bricks; however, an excessively low temperature poses a risk of blockage at the slag outlet. Therefore, as a principle, ensuring smooth slag discharge should be the priority, with the thickness of the slag accumulation on the refractory bricks being considered secondarily. The Texaco process is limited by refractory bricks, and the quenching process imposes strict requirements on the quality of coal; generally, the ash content ranges from 8% to 12%. The 15% figure mentioned earlier is indeed a bit high – it’s not clear whether this applies to a single type of coal or to coal that has been blended together. But nothing is absolute; a high ash content in coal also poses a challenge to the skill level of the operators:):):).