Abstract
In the present investigation, the 2ry Tuyere were used to combust the excess CO to CO2 and utilize the combustion heat to preheat the charge. The 2ry tuyere was attached at 1, 300mm anove the 1ry tuyere level on 3t cupola.
Results obtained were summarized as follows.
(1) The blast by the 2ry tuyere combust the excess CO gas and the charge is preheated by this combustion heat.
(2) The blast pressure at the 1ry tuyere level is lowered and the coolnig effect on the tuyere is reduced.
(3) The temperature of molten metal is rised and the melting velocity increases.
