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Low temperature gas continuous digester
A pulp continuous digester (such as used to produce KP pulp) not only has the advantages of a liquid phase digester but also has a gas phase filling zone above the liquid phase. The mixture of chips and digested black liquor enters the top of the cooking vessel through the top inverted separator, the liquid phase level is below the inverted top separator, and the chip level is also below the inverted separator (above the liquid level or Below), the gas-filled region is above the liquid phase, the gas phase includes the compressed gas, the temperature is below 160°C (typically below 120°C), and the pressure is between 50-200 psi (generally between 80-150) Pounds per square inch is more suitable). The digester is divided into two parts, the upper part is about 3-5 meters in diameter, the lower part is at least about 7 meters in diameter, the inverted separator is located in the upper part of the digester, the liquid phase is in the upper part, the chip part is in the lower part, in the upper part and the lower part There is a transition zone between them and it is preferable to install a sieve in the lower part of the cooking zone below the transition zone. Most of the liquid is extracted from the inverted top separator.