Water tube steam boiler

HoSt supplies water tube steam boilers. In a water tube steam boiler, the water flows through the pipes and the flue gasses pass around the pipes. Water tube steam boilers are applied above 32 bar and with difficult fuels.

This type of boiler can be cleaned automatically and with ease thanks to the HoSt technology applied. High pressure steam is blown, with a lance, between the pipes to remove dust. In this way the water tube bundles are cleaned thoroughly.

Difficult fuels with a lot of sodium and potassium, such as straw, chicken manure and pulp, tend to deposit a harsh stone kind of deposition on the pipes. Cleaning is therefore an important issue; and a major advantage of the water tube boiler.

For specific fuels with a very low ash melting point (and with RDF), the boiler is built in two sections. The first section is a cooled membrane section; a radiation cooler. The flue gas with fly ash is cooled in this section to prevent harsh stone-like ash deposits in the pipe bundles. The second section is made from evaporator pipes.