US 5,820,729 AGranted

Device and process for dissolving smelt from recovery boilers

AssigneeKvaerner Pulping AB

InventorsTommy Ericsson, Sven-Erik Jansson

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Abstract

The invention relates to a device for dissolving smelt chemicals from recovery boilers, a so-called soda smelt dissolver, and to a process for such dissolution using the device. The device is characterized in that it consists of at least two separate dissolving tanks (I, II), which are connected to each other near the bottom, via a connecting pipe (3), to allow free flow of liquid between them, and of devices for the separate supply to each tank of dissolving liquid and smelt chemicals in dependence on the measured and established chemical concentration in the solution in each of the tanks (I, II), wherein the outlets from the tanks (I, II) can be separately shut off and regulated. The process according to the invention involves using the device and switching over the functions of the different tanks.

Claims12

Dependent claims

A process for dissolving smelt chemicals from recovery boilers, the process comprising the steps of:

providing a first dissolving tank having a bottom portion, the first dissolving tank containing a first resulting solution having a first concentration of smelt chemicals;
providing a second dissolving tank that is separate from the first tank, the second dissolving tank having a bottom portion, the second dissolving tank containing a second resulting solution having a second concentration of smelt chemicals;
providing supply devices for supplying smelt chemicals into the first and second dissolving tanks;
providing liquid supply members for supplying a dissolving liquid into the first and second dissolving tanks so that the smelt chemicals and the dissolving liquid form the resulting solutions disposed in the first and second dissolving tanks, the supply of dissolving liquid and smelt chemicals being dependent upon the concentration of the smelt chemicals in the resulting solutions;
providing a first outlet defined in the first dissolving tank for permitting the first resulting solution to flow out of the first dissolving tank;
providing a second outlet defined in the second dissolving tank for permitting the second resulting solution to flow out of the second dissolving tank;
providing a connector connected to the bottom portions of the first and second dissolving tanks so that the first dissolving tank is in fluid connection with the second dissolving tank;
providing a first shut off valve in operative engagement with the first outlet, the first shut off valve being movable between an open position that allows the first resulting solution to flow through the valve and a closed position that shuts off the flow of the first resulting solution;
providing a second shut off valve in operative engagement with the second outlet, the second shut off valve being movable between an open position that allows the second resulting solution to flow through the valve and a closed position that shuts off the flow of the second resulting solution, the second shut off valve being independently operative relative to the first shut off valve;
closing the first shut off valve and opening the second shut off valve;
setting a first set point of the concentration of the smelt chemicals in the first dissolving tank;
setting a second set point of the concentration of the smelt chemicals in the second dissolving tank;
conducting the first resulting solution to flow into the second tank when the second set point is greater than the first set point;
conducting the second resulting solution into the first tank when the first set point is greater than the second set point;
and
opening the first shut off valve and closing the second shut off valve.

13 more elements

A device for dissolving smelt chemicals from recovery boilers, comprising:

a first dissolving tank having a bottom portion, the first dissolving tank containing a first amount of a first resulting solution having a first concentration of smelt chemicals;
a second dissolving tank that is separate from the first tank, the second dissolving tank having a bottom portion, the second dissolving tank containing a second amount of a second resulting solution having a second concentration of smelt chemicals, the first amount being greater than the second amount, the second concentration being greater than the first concentration;
supply devices for supplying smelt chemicals into the first and second dissolving tanks;
liquid supply members for supplying a dissolving liquid into the first and second dissolving tanks so that the smelt chemicals and the dissolving liquid form the resulting solutions disposed in the first and second dissolving tanks, the supply of dissolving liquid and smelt chemicals being dependent upon the concentrations of the smelt chemicals in the resulting solutions;
a first outlet defined in the first dissolving tank for permitting the first resulting solution to flow out of the first dissolving tank;
a second outlet defined in the second dissolving tank for permitting the second resulting solution to flow out of the second dissolving tank;
a connector connected to the bottom portions of the first and second dissolving tanks so that the first dissolving tank is in fluid connection with the second dissolving tank;
a first shut off valve in operative engagement with the first outlet, the first shut off valve being movable between an open position that allows the first resulting solution to flow through the valve and a closed position that shuts off the flow of the first resulting solution;
and
a second shut off valve in operative engagement with the second outlet, the second shut off valve being movable between an open position that allows the second resulting solution to flow through the valve and a closed position that shuts off the flow of the second resulting solution, the second shut-off valve being independently operative relative to the first shut off valve.

7 more elements

Dependencies are inferred from the claim text.