Taphole blockage

Have everyone encountered a normal oxygen-coal ratio?

Is it the high furnace temperature that causes the slag outlet to get blocked first? Adjusting the oxygen-coal ratio should still cause the furnace temperature to drop

No, it’s just that the slag outlet gets blocked at normal operating temperatures; the furnace temperature is high, and the carbon dioxide level has dropped to 14

Is it because, after the slag outlet became blocked, measures were taken to raise the temperature of the slag? When large pieces of slag fell into the slag pool through that outlet, some water vapor entered the furnace, resulting in the reaction CO2 + H2O = CO; as a result, the concentration of CO2 in the furnace actually decreased. What are the other reasons for blockage at the slag outlet of the gasification furnace? If the burner cover or burner head leaks, causing blockage at the slag outlet, the same issues will occur during temperature increase operations. In short, a clogged taphole prevents the reactions in the furnace from proceeding as normally, and a case-by-case analysis is required.

Entering the steam – is there definitely steam inside? Is water-coal slurry gasified?

Normal operation leads to the accumulation of slag at the slag outlet, which results in a high temperature inside the gasification furnace. This is caused by poor slag discharge, resulting in a narrowing of the slag outlet; as a result, the heat generated in the combustion chamber of the gasification furnace cannot be removed in time, leading to heat accumulation and thus a high temperature. The possible causes include: 1. Fluctuations in coal quality; 2. Measurement errors that result in a low oxygen-to-coal ratio; 3. Cumulative effects, with a consistently low proportion of central oxygen. The consequences include high temperatures, which inhibit the reaction between carbon and oxygen to form carbon dioxide. At the same time, the amount of slag discharged decreases, the carbon content in the slag drops significantly, the amount of methane decreases, the pressure difference at the slag outlet increases, and large pieces of slag are discharged. The slag has a large particle size and contains a significant amount of glassy substances.