Development of Kraft Recovery Boilers – What have been the Main Development Steps?, 19PEERS
Tomlinson-type recovery boiler is celebrating its 85th birthday in 2019. Tomlinson-type recovery boiler has set the basis for modern kraft recovery boilers. Throughout its history, kraft recovery boilers have been widely developed, focusing mainly to increase safety of the operation, boiler availability, firing capacity, power generation, and to decrease emissions to the atmosphere.
All the way, different trends and demands have been guiding the development of kraft recovery boilers. However, three main topics, which have had the biggest influence on kraft recovery boiler development, can be pointed out; 1) economy of scale, 2) power production, and 3) reduction of nitrogen oxide (NOx) emissions. These have led to increasingly larger furnaces, lower emissions, and higher power generation efficiencies. Today, a modern kraft recovery boiler has features similar to power boilers along with efficient recovery of the cooking chemicals.
This paper will review the development of kraft recovery boilers during the last six decades; how the trends and demands have modified the kraft recovery boiler process, what have been the major steps in the development, and how these changes have affected the layout, structure and process parameters of kraft recovery boilers? This review is based on the data available on units in operation and reference databases.
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