Method of utilizing residual heat in the production of cellulose

Power plants – Motive fluid energized by externally applied heat – Process of power production or system operation

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F01K 2514

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active

042791260

ABSTRACT:
A method and an installation for the utilization of residual heat in pulp mills, where spent cooking liquor is evaporated with vapor in a multi-stage evaporator. The installation for carrying out the method comprises a number of evaporation steps connected in such a way, possibly by arranging several steps or groups of steps in parallel, that the outlet vapor from the last step or steps holds saturation pressure immediately below atmospheric pressure, a heat exchanger for condensation of the outlet vapor from the evaporation steps during evaporation of a fluid which, for the corresponding amount of heat, at the actual heat exchange temperature, has a markedly smaller volume than the outlet vapor, a turbine for expansion of the fluid vapor, a condenser for condensing the outlet vapor from the turbine, and a pump for increasing the pressure of the condensed fluid to a pressure suitable for return to the heat exchanger.

REFERENCES:
patent: 1272378 (1918-07-01), Collins
patent: 3878683 (1975-04-01), Imai
patent: 4033141 (1977-07-01), Gustafsson
patent: 4191021 (1980-03-01), Nakamura et al.

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