Patent ID: 7381302
Filing Date: 2008-06-03
Classification: D21C

Abstract:
1. An arrangement for the impregnation of chips during the manufacture of chemical pulp, comprising: an impregnation vessel arranged vertically, the impregnation vessel containing chips and an impregnation fluid having a liquid level (LIQ LEV), feeding means, attached to the impregnation vessel, for continuously feeding un-steamed chips into a top of the impregnation vessel, output means for feeding impregnated chips at a bottom of the impregnation vessel, a first input line connected to the impregnation vessel at a first depth of the impregnation liquid below the liquid level (LIQ LEV) of the impregnation liquid contained in the impregnation vessel, the first input line being adapted to supply a first impregnation fluid into the impregnation vessel at the first depth, the first input line being connected to the impregnation vessel at the first depth, a second input line connected to the impregnation vessel at a second depth of the impregnation liquid below the liquid level (LIQ LEV) of the impregnation liquid contained in the impregnation vessel, the second depth being below the first depth in the impregnation liquid contained in the impregnation vessel, the second input line being adapted to supply a second impregnation fluid into the impregnation vessel at the second depth, the second input line being connected to the impregnation vessel at the second depth, the first input line and the second input line being connected to a common liquor supply line at a connection point, cooling means for cooling the first impregnation fluid flowing in the first input line, the cooling means being disposed in the first input line downstream of the connection point of the common liquor supply line, a third input line disposed between the first input line and the second input line, the third input line being in direct fluid communication with both the first input line and the second input line, the third input line being connected to the impregnation vessel at a third depth, and withdrawal strainer means, arranged in the impregnation vessel disposed above the first depth and below a highest level (CH LEV) of the chips, for withdrawing impregnation fluid from the impregnation vessel.