The design and installation of thermal insulation in the walls of a boiler plant's flue gas cleaning equipment is of critical importance to its service life and functionality. A good insulation solution prevents the interior walls cooling below the point where the acid contained in the flue gas condenses and forms corrosive deposits. In this respect, it is crucial that no cold areas form on the interior wall.
For such applications, the operational characteristics of PAROC products are ideally suited. They provide excellent thermal insulation in the temperature range of flue gasses, have low air permeability, are moisture resistant and offer good compression strength in roof structures. An additional important property of PAROC products is their very low chloride and fluoride content, which helps to minimise corrosion.
It is important to avoid all possible cold bridges because they can create areas where acidic vapours can condense.
Preventing cold bridges
Critical areas such as wall bracing structures, adhesive surfaces, and access covers can be insulated effectively using multilayer insulation solutions with overlapping seams. The installation properties of the solutions enable tight insulaiton of wide, flat surfaces.
In this kind of application, a double layer of insulation is usually used in order to prevent cold bridges. Generally, both layer are slabs, but it is possible to combine slabs with wired mats. Flat surfaces can be insulated with slabs or wired mats. Paroc has developed a range of products that are suitable for use in desulphurisation equipment and electrostatic precipitators.
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