The ICAVI mixed boiler project aims to meet the market demand for medium-sized generating units, operating in medium pressure and temperature ranges, with high thermal efficiency and low operating cost, with the basic characteristics of building two-pass body in the circuit of gases, with expanded tubes, burning fuel through a reciprocating grid, with a furnace and a post-burning chamber lined with refractory bricks, in order to ensure complete combustion.
The walls of the ICAVI boilers are all built with panels of finned tubes, which makes the wall highly resistant and shielded against gas leakage and external air intake.
In the internal part of the furnace and post-firing walls, refractory bricks are installed with a perfect fit on the finned walls, thus allowing a greater transfer of heat from the refractory to the tubes. The same refractories fit together, creating resistance when applied and anchoring them to the finned walls.
Acceptance of fuels with a high degree of humidity, variations in fuel granulometry and due to the large mass of fuel on the grill, stability in combustion and boiler load. The design of the heat exchange areas had the objective of providing sufficient safety margins to meet the production peaks, to compensate for the thermal resistance caused by normal soot films that will eventually adhere to the tubes, guaranteeing the production of steam and the expected efficiency throughout the period of operation.
The convection section was calculated with an adequate speed so as not to allow sedimentation of the solid particles possibly contained in the gas, but at levels that ensure no risk of erosion at the entrance of the gases.
The circulation of water / steam between the main body and the furnace / post-combustion chamber is ensured by the conservative use of quantities of downcomers and risers.
Posted in: 11.05.2021
Posted in: 06.05.2021