Changes in the pH of the black water from the gasification grate after flash evaporation
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The black water from the gasifier grate experiences an increase in pH after flashing – what is the principle behind this? During flashing, some acidic gases are released; ammonia is the main basic substance. Could trace amounts of dissolved ammonia nitrogen be responsible for an increase in pH? What is the specific mechanism of action of PH in alkaline conditions?
It is mainly because CO2 is flashed out, which causes the pH value to be high. It can be calculated based on the process package; the vast majority of the flash vapor is CO2.
Reasonably controlling the pH of slag water helps prevent pipe corrosion and blockages.
The evaporation of CO2 leads to an increase in pH.
In the slag water treatment section, as the pressure decreases in the gasification furnace black water, the acidic gases dissolved in it are continuously released. Additionally, ammonia-containing condensate from the shift system is added to the slag water treatment process; as a result, the pH of the water after slag treatment is higher than that of the gasification furnace black water.