4th International Symposium on Waste Treatment Technologies Sheffield, Uk (29 June - 2 July 2003)
The demands on modern waste to energy plants very much focus on high energy efficiency, long continuous availability and low maintenance and operational cost. At the same time, the plant has to live up to a new, strict EU legislation. These requests result in new technologies such as Advanced Combustion Control (ACC), use of Inconel® protection in boilers, boiler cleaning, water cooled combustion grates and wear zones. This paper will describe how Babcock & Wilcox Vølund (BWV) is improving the design of waste to energy plants by implementing these new technologies.
Boiler Cleaning Related Statement
New boiler cleaning systems
A new cleaning method has been developed which considerably reduces the undesired downtimes with the cost-intensive manual cleaning of the boiler plants. As a result, the boiler operating periods specified at the planning stage can be realized. The cleaning system consists of a hose which is lowered into the boiler through the ceiling, see At the end of the pipe, a rotating nozzle is mounted, which operates with water as blowing agent. The water jet penetrates, with high kinetic energy, the pores of the slag coat on the tube walls, evaporates and causes the tenacious slag to flake off as a result of the abrupt increases of the volume produced. The technology of water hose and rotating nozzle cleaning system is particularly suited for enables an effective cleaning performance at low operating costs. Cleaning the radiant part of the boiler and thereby control the inlet temperature to the convection part. It enables an effective cleaning performance at low operating costs.
Cleaning of the evaporator walls by means of water yields a very good result. In figure 4 the outlet temperature of the second draft is shown as function of time. A daily cleaning sequence gives a temperature reduction of 60 °C to 70 °C.
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