Texaco: How to handle coal quality variations in the pulping, gasification, and flash evaporation stages?

1. Coal slurry preparation: The coal slurry is prepared with an oxygen-to-carbon atom ratio of 1 based on carbon element analysis, and the amount of additives is adjusted according to the analysis of the coal slurry； 2. Gasification may slightly increase the furnace temperature, as higher ash content leads to greater heat loss; the key factor remains the change in the ash melting point ； 3. Adjust according to the graywater analysis results. The ash content alone is not sufficient to determine how to adjust the process. A comprehensive analysis is essential.

Increased ash content: 1. When the ash content increases, the pulping unit can increase the amount of solubilizer used as needed in order to adjust the ash fusion point of the slag； Based on the analysis, it is necessary to determine whether this has affected the hardness of the coal; if there is a change in hardness, the load on the grinder can be adjusted accordingly to ensure that the coal-water slurry meets the required standards ； 2 An increase in ash content leads to a rise in the melting point of the slag, which makes slag blockage more likely to occur. It is necessary to increase the oxygen-to-coal ratio to ensure smooth discharge of the slag. At the same time, the water quality is affected; therefore, the amount of quench water should be increased, along with the volume of wastewater discharged. Enhancing the water circulation within the system helps maintain good water quality. To achieve better washing of the process gas, more condensate should be added to the scrubber towers, and the discharge volume from these towers should also be increased. Additionally, attention should be paid to any water carryover in the gasification furnace and scrubber towers ； 3 As the circulation water volume in the gas treatment section increases, the load associated with graywater treatment also increases; it is necessary to constantly monitor the liquid level in each tank, and stop the flow of water from the slag tank to the vacuum tank (this flow is generally stopped) ； Increase the amount of flocculant to improve water quality.