STEAM BOILER WITH MECHANICAL STOKER FOR SOLID FUEL COMBUSTION Russian patent published in 2009 - IPC F22B21/00 F23B30/00 

FIELD: power engineering.

SUBSTANCE: invention is attributed to heat-power engineering, in particular to boilers for low-grade solid fuel combustion such as wood fuel, milled peat, brown and black coals, and can be used on hot-water and steam boilers. The technical result is achieved by means of the following: according to the invention at inlet of convection tube bank there is opening for passing and horizontal turn of combustion gases, and at outlet there is opening in the back wall of convection bank located symmetrically to opening for combustion gases injection into convection bank where cast iron partition is installed; and the boiler itself contains ash reinjection and overfire air system. The combustor is made mechanical with air blow supply through fire bars of reciprocating grate. In this combustor back furnace waterwall is turned towards front furnace waterwall forming aerodynamic projection located in lower half of combustor overlapping up to 30% of combustor horizontal section area, and below aerodynamic projection is tilted at an angle of 0÷30° to mechanical stoker plane.

EFFECT: boiler efficiency increase, improvement of operation reliability of steam boiler with mechanical stoker.

7 cl, 3 dwg