BOILER FOR REFUSE DERIVED FUEL COUPLED WITH THERMAL OIL BOILER AND STEAM BOILER

摘要

Disclosed is a boiler for refuse derived fuel combined with a thermal medium boiler and a steam boiler, which is capable of minimizing heat loss and producing steam together with heat or hot water. The boiler for refuse derived fuel includes: a combustor; a first upward heat recovery unit connected on an upper fire propagation path of the combustor, having a first exhaust port formed on an upper part, and having a heat-transfer pipe formed on an inner wall; a circulating heat recovery unit connected to an upper part of the first upward heat recovery unit, having a first intake port formed on one side of a lower part to communicate with the first exhaust port, having a second exhaust port formed on the other side of the lower part, and having a heat-transfer pipe formed on an inner wall; a downward heat recovery unit connected to the circulating heat recovery unit to communicate therewith, having a second intake port formed on an upper part to communicate with the second exhaust port, having a third exhaust port and a first dust discharge port formed on a lower part, and having a heat-transfer pipe formed on an inner wall; a second upward heat recovery unit provided in parallel with the downward heat recovery unit, having a fourth exhaust port formed on an upper part, having a third intake port and a second dust discharge port formed on a lower part to communicate with the third exhaust port, and having a heat-transfer pipe formed on an inner wall to be connected to the heat-transfer pipe of the circulating heat recovery unit and the heat-transfer pipe of the downward heat recovery unit; an economizer provided in parallel with the second upward heat recovery unit, having a fourth intake port formed on an upper part to communicate with the fourth exhaust port, having a fifth exhaust port and a third dust discharge port formed on a lower part, and having a heat-transfer pipe formed on an inner wall; a feed pump configured to supply water to the heat-transfer pipe of the economizer; and a steam drum configured to generate steam while circulating feed water heated through the heat-transfer pipe of the first upward heat recovery unit and the heat-transfer pipe of the economizer.