The dust content issue in raw coal gas
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How can the dust content in raw coal gas be kept within the specified limits?
Control the dust content in raw coal gas by adjusting the water volume in the carbon scrubber and the three-stage flash evaporation
The requirement for the dust content in raw gas in the process package is also very low, at 0.5%, but it is generally necessary to keep this value even lower.
To what level should the dust content in raw coal gas be controlled to avoid any impact on the shift reaction?
The question is too general; first of all, when the operating conditions are stable, increasing the amount of phenol-water used for washing will suffice to resolve the issue. If the operating conditions are unstable, it is necessary to improve the conditions of the gasification unit.
The lower, the better; ideally, it should be zero. However, this is an ideal situation. You can try adding a protective layer during the transformation, which will help. In typical process packages, this value is less than 0.5%.
What type of vaporization is this, OP? Is it a fluidized bed or a fixed bed? Gas fluidized beds have their own control methods, and fixed-bed reactors have their own control methods. The desired dust content in the process package for fluidized bed technology is generally within 10 ppm, and a similar figure is estimated for fixed beds as well.
Increasing the amount of water used for quenching, reducing the amount of black water discharged from the scrubber tower, and increasing the water flow in the venturi all have a positive effect