Furnace

A furnace for burning solid fuel in the presence of air whereby products of combustion are produced, said furnace comprising:

• a fire-box compartment being rectangularly-shaped with four vertical walls, three of said four vertical walls being double walls to form a liquid chamber, said fire-box compartment having a means for supplying air into the fire-box compartment and for preheating the air so supplied, said fire-box compartment further including an opening for supplying solid fuel into the fire-box compartment;
• a lid pivotably mounted on said fire-box compartment over the opening in the fire-box compartment for sealing the opening in said fire-box compartment for supplying solid fuel into the fire-box compartment;
• a heat-exchanger compartment having a top and a bottom, said heat-exchanger compartment including a liquid container with a series of fire-tubes vertically oriented through the liquid container, the liquid container being located below the top of the heat-exchanger compartment to form an upper flue gas passage over the liquid container, said heat-exchanger compartment further including a lower flue gas passageway beneath said liquid container;
• a baffle located in said lower flue gas passageway of said heat-exchanger compartment, said baffle having a damper pivotable mounted in it;
• a means located partially outside said heat-exchanger compartment for pivoting said damper to open and close said damper;
• a channel connecting the fire-box compartment with the lower flue gas passageway in the heat-exchanger compartment to supply products of combustion from the fire-box compartment to the heat exchanger compartment, said lower heat-exchanger compartment having a flue gas exit for discharging the products of combustion, said flue gas exit being located in said lower flue gas passageway opposite from said channel, said baffle being located substantially midway between the channel and the flue gas exit;
• a secondary air inlet located in said channel for supplying additional air to the products of combustion in the channel for further combustion;
• and
• means for supplying and removing liquid from said liquid chamber and said liquid container.