General
To clean out blockages in Regenerators Checkerwork such as sulphates and very small quantities of batch carry over in order to allow free flow of waste gases/combustion air inout
of the furnace. This is achieved by applying heat to melt the sulphate to a liquid state.

Method
By placing burners in the base of the Regenerators firing under the rider arches. The size of the Regenerators to be cleaned will determine the quantity of burners to be used. Normally two per side is adequate, one, firing with 45° cone and one firing straight. The 45° cone can be rotated left and right to fire up the side wall if it is necessary. ex°Celsius will place the burners through the wicket side by side if possible, we keep the burners as high as possible and away from the floor of the Regenerator base, as usuallythere will be a pool of molten sulphate when the required temperature is attained.

Operation
The custumer will be required to reduce combustion air to a minimum and inversion should be set to 30 minutes, after that ex°Celsius will, start the burners down in the basement on the firing side. With a schedule of max. 50°/h Excelsius will increase the temperature to between 600 to 700°C in order to prevent the chamber from cooling down too much. The furnace operator will have to
make some adjustments to their furnace after starting the ex°Celsius burners, as the furnace pressure may rise. When the temperature is approaching 750°C on the other side, ex°Celsius will carry out visual checks inside the base of the Regenerator looking for any hotspots on brickwork. From 800°C ex°Celsius will start to take optical readings (with a Pyrometer supplied by the customer) on the rider arches for a cross check and to ensure the temperatures are not to high on the arches. Usually, a regenerator clean out takes about 48 to 72 hours.