Pre-processing of soap
The AGA-developed method where soap is pre-processed using carbon dioxide can considerably reduce the amount of sulphuric acid used in the tall oil production process.
Lime Kilns: Efficiency increase with oxygen
The production rate of a lime kiln can increase by use of oxygen. The capacity increase makes it possible to postpone investments in additional capacity. The alternative of purchasing more lime and depositing the surplus of lime mud is costly. Fuel savings add to a very high profitability of oxygen addition. The considerable fuel savings with oxygen addition can in some cases make oxygen addition profitable even when no additional production capacity is required. Linde's technology for increasing the capacity of lime kiln using oxygen can be achieved to a very low investment cost. Oxygen has been used for several years to boost capacity and save fuel in many lime kilns in pulp mills. The technology is also used in cement kilns and similar installations. Linde has extensive experience of these types of furnaces and combustion processes in many countries.
White Liquor Oxidation
Oxygen may be used alone or as a complement to air when oxidizing white liquor. In several mills where oxygen from Linde is used for white liquor oxidation oxygen is used as a complement to air. Increased capacity can be achieved without any larger investments.
TOMLOX® – increasing recovery boiler capacity
A much better lower furnace combustion characteristics in form of higher emissivity and mixing is achieved with TOMLOX® (patents granted) by reducing the amount of cold nitrogen supplied with combustion air, and replacing air with oxygen. This allows for a decrease in the total mass of oxygen supplied to the lower furnace. This reduction in flue gas volume and dead load in the lower furnace and in spite of decreased oxygen stoichiometry and unchanged combustion temperature, accelerates the rate of combustion significantly. The "carry-over" is also reduced due to lower upward gas velocities, and more black liquor can be processed. This new low capital technology has been implemented and tested for one year at the Stora Enso Norrsundet mill in Sweden with several benefits.