Valmet Technologies, Inc.

Metso Power Oy

Valmet Power Oy

Valmet Technologies Oy

Timo Honkola

Jani Lehto

Joakim Autio

Pasi Salonen

Kari Kuukkanen

Solid fuel in the form of particles is supplied to a pyrolyzer, and pyrolysis conditions are maintained in the pyrolyzer for separating condensable gaseous substances from the fuel. Heat required by the pyrolysis conditions is supplied at least partly with solid fluidized bed material which passes through the pyrolyzer simultaneously as it is fluidized by fluidizing gas in the pyrolyzer. Condensable gaseous substances separated from the fuel are conveyed from the pyrolyzer to a condenser, in which they are separated as so-called pyrolysis oil in liquid form, and solid fluidized bed material taken from the pyrolyzer and containing combustible pyrolysis residue originating from the fuel is circulated through a gasifier, in which product gas, which is burnt in a boiler or a kiln, is formed from the pyrolysis residue.

Method for performing pyrolysis and a pyrolysis apparatus

The invention relates to a method and equipment for treatment of black liquor at a pulp mill in order to recover chemicals and energy contained therein. In the invention, the black liquor is pyrolyzed in a pyrolysis reactor (), the formed gaseous components are forwarded for utilization and the solids are mixed with water, whereby the formed solids are returned to a lime burning kiln () and the sodium-hydroxide-containing liquid is returned to the pulp cooking process.

Method and equipment for treatment of black liquor at pulp mill

A pyrolysis apparatus comprises a furnace () operating by fluidized bed combustion, a pyrolyzer () and flow paths, which connect the furnace () and the pyrolyzer () for arranging the circulation (C) of carrier material of the fluidized bed combustion between the furnace and the pyrolyzer .The apparatus also comprises a supply inlet () for supplying fuel to be pyrolyzed to the pyrolyzer (), fluidizing gas supply means () arranged in the pyrolyzer for fluidizing the mixture of carrier material and fuel, and an outlet () for taking condensible gaseous substances separated from the fuel to be pyrolyzed out of the pyrolyzer (), and a condenser for condensing the condensible gaseous substances. The carrier material circulation is arranged at the furnace () by a cocurrent principle along the flow path of hot flue gases, which comprises a separator () located higher than the pyrolyzer (), which separator is arranged to separate carrier material from flue gases, while the circulation also comprises a connecting conduit () between the separator () and the pyrolyzer () for moving the carrier material by gravity to the pyrolyzer (), and a return path () between the pyrolyzer () and the furnace () for returning the carrier material to the furnace (). The outlet () is arranged in the chamber formed by the pyrolyzer () in its upper part in a space above the fluidized mixture of carrier material and fuel in order to remove the condensible gaseous substances from the pyrolyzer.

Pyrolysis method in connection with a boiler and a pyrolysis apparatus

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Kangasala, Finland

Timo Honkola