Recovery boiler

The Recovery boiler recovers chemicals and energy, which is used in the cooking stage where wood chips are refined to cellulose. The black liquor is a mixture of by-products from this separation process. All chemical pulp-mills rely on this chemical recovery cycle for their economical and sustainable operations.

Pulp mills stay competitive by lowering production costs per ton cellulose and one way of doing that is to increase cellulose production. Since the recovery boiler is so expensive, it is commonly operated at or above original design capacity which presents challenges with regard to availability and runnability. The most common reason for reduced availability is fouling of the boiler heating surfaces. To combat this, retractable steam sootblowers are used to keep the boiler insides clean.

Like the recovery boiler operation, retractable steam sootblowers are operated at maximum capacity, meaning there is no additional cleaning capacity to increase boiler availability. It is in this setting that Heat Management introduces the patented High Impact Sootblowing System (HISS^®), increasing the cleaning capacity of the existing steam sootblowers by 100 %. Benefits include increasing recovery boiler availability, cleanability and efficiency, while reducing steam consumption. HISS^® provides the mill with the necessary tool, allowing safe increase of production levels beyond technical specification i.e. process more black liquor in the boiler, without jeopardizing the process availability.