Control of a black liquor recovery boiler

Details Control of a black liquor recovery boiler Control of a black liquor recovery boiler

1986-03-06

1987-08-04

Yuen, Henry C.

Liquid heaters and vaporizers

Fluid and solid fuel

110238, 162 301, F22B 3104, D21C 1112

Patent

active

046838414

ABSTRACT:
A method for controlling the combustion and reduction processes in a black liquor (B.L.) boiler of a paper pulp plant by influencing the feeding of black liquor to the B.L. recovery boiler by means of a B.L. gun. Characteristic of the method is that the average thickness of the layer of the B.L. flow, immediately after the black liquor has left the B.L. gun, is controlled to have a desired magnitude. The thickness of the B.L. layer is obtained in the form of an indirect measure which is defined as the droplet index (=DIX) and is constituted by a relationship between the viscosity, the density and the feed rate of the black liquor and by at least the shape and the opening area, of the B.L. gun.

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