Svenska Traforskningsinstitutet

Asea Aktiebolag

Stfi

Sodra Skogsagarna Ab--monsteras Bruk

Torbjorn Herngren

Malin C Zethraeus

Susanne Andersson

Gunnar Hage

Jan-Erik Gustafsson

Birgitta S Andersson

Jon Lofthus

Staffan Carlsson

Jan-Erik V Gustafsson

Process and apparatus for control in burning and slaking of lime and

The invention relates to a method of measuring dry substance in the flue gas in liquor recovery units in mills for the manufacture of papermaking pulp in order thereby to render it possible to control the operation of the unit. According to the invention, this is carried out in that the radiation emission caused at the combustion of fuel particles in the hearth of the unit above the fuel supply level is detected optically, and that the signals are used for indication and/or control of the operation of the unit.

Method of measuring dry substance in flue gases

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.

Control of a black liquor recovery boiler

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Alvsjo, Sweden

Torbjorn Herngren