Development of waste heat recovery boiler technology

The use of Kraft recovery boilers spread fast as functioning chemical recovery gave Kraft pulping an economic edge over sulfite pulping.

The first waste heat recovery boilers had horizontal evaporator surfaces, followed by super heaters and more evaporation surfaces. These boilers resembled the state-of-the-art boilers of some 30 years earlier. This trend has continued until today. Since a halt in the production line will cost a lot of money the adopted technology in recovery boilers tends to be conservative. The first waste heat recovery boilers had severe problems with fouling.

Development of waste heat recovery boiler technology

Tube spacing wide enough for normal operation of a coal fired boiler had to be wider for waste heat recovery boilers. This gave satisfactory performance of about a week before a water wash. Mechanical soot blowers were also quickly adopted. To control chemical losses and lower the cost of purchased chemicals electrostatic precipitators were added. Lowering dust losses in flue gases has more than 60 years of practice.

One should also note square headers in the 1940 recovery boiler. The air levels in waste recovery boilers soon standardized to two: a primary air level at the char bed level and a secondary above the liquor guns.

In the first tens of years the furnace lining was of refractory brick. The flow of smelt on the walls causes extensive replacement and soon designs that eliminated the use of bricks were developed.

Project: waste heat recovery boiler in Uzbekestan
Application: waste heat recovery boiler in paper industry

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