Method for regulating the output of a solid-fuel furnace and furnace with a corresponding output regulator

Abstract

A method is provided for regulating the output of a solid fuel furnace having primary and secondary combustion chambers arranged adjacent to each other, in particular one above the other or side by side, and are separated from each other by a partition in the floor or wall but are nevertheless connected to each other by at least one partition opening. The secondary combustion chamber is connected through a secondary exhaust-gas channel to a flue-gas passage, and the primary combustion chamber is connected to the flue-gas passage by a transition opening, wherein the transition opening can be closed at least partially by a flue-gas flap. Both a primary air supply and a secondary air supply are provided. A first temperature sensor is arranged in the secondary exhaust-gas channel and controls the primary air volume flow as a function of the temperature in the secondary exhaust-gas channel, while the secondary air volume flow is held substantially constant.

1 . A method for regulating output of a solid fuel furnace having primary and secondary combustion chambers arranged adjacent to each other and separated from each other by a partition but nevertheless connected to each other by at least one partition opening, wherein the secondary combustion chamber is connected by a secondary exhaust-gas channel to a flue-gas passage, wherein the primary combustion chamber is connected to the flue-gas passage by a transition opening, and wherein the transition opening is at least partially closable by a flue-gas flap, the method comprising providing a primary air volume flow and a secondary air volume flow, measuring a temperature in the secondary exhaust-gas channel by a first temperature sensor in the secondary exhaust-gas channel, regulating the primary air volume flow as a function of the temperature measured in the secondary exhaust-gas channel, and maintaining the secondary air volume flow substantially constant. 
     
     
         2 . The method according to  claim 1 , wherein the primary combustion chamber is arranged above the secondary combustion chamber, and the partition opening is in a floor of the primary combustion chamber. 
     
     
         3 . The method according to  claim 1 , wherein the primary and secondary combustion chambers are arranged side by side, and the partition opening is in a wall between the primary and secondary combustion chambers. 
     
     
         4 . The method according to  claim 3 , wherein the opening in the wall is located in the lower fourth of the height of the wall. 
     
     
         5 . The method according to  claim 1 , wherein a cross section of the partition opening between the primary and secondary combustion chambers is adjustable as a function of a temperature in the secondary exhaust-gas channel. 
     
     
         6 . The method according to  claim 1 , wherein an outlet of the secondary exhaust gas channel to the flue-gas passage can be blocked. 
     
     
         7 . The method according to  claim 1 , wherein a second temperature sensor is arranged in the flue-gas passage essentially immediately after the transition opening from the primary combustion chamber to the flue-gas passage, and wherein a position of the flue-gas flap is regulated by the second temperature sensor as a function of a temperature at the second temperature sensor. 
     
     
         8 . The method according to  claim 1 , wherein the primary and secondary air volume flows are regulated separately in primary and secondary air supply channels. 
     
     
         9 . A furnace operated by a method for regulating output according to  claim 1 , wherein a free cross section of the partition opening is adjustable. 
     
     
         10 . The furnace according to  claim 9 , wherein a slide is provided for changing the free cross section of the partition opening. 
     
     
         11 . The furnace according to  claim 9 , wherein a heat accumulator is arranged in the secondary combustion chamber. 
     
     
         12 . The furnace according to  claim 9 , wherein the primary combustion chamber has a floor constructed as an ash pan for receiving combustion ash. 
     
     
         13 . The furnace according to  claim 9 , wherein the furnace has a primary air supply channel and a pivoting primary air flap arranged in the primary air supply channel, and wherein the air flap is connected to the first temperature sensor. 
     
     
         14 . The furnace according to  claim 9 , wherein the furnace has a single flue-gas flap for blocking respectively an outlet of the secondary exhaust-gas channel and the transition opening. 
     
     
         15 . The furnace according to  claim 13 , wherein the primary air supply channel opens into an upper region of the primary combustion chamber. 
     
     
         16 . The furnace according to  claim 13 , wherein the secondary air supply channel opens into the furnace in a region of the partition between the primary and secondary combustion chambers.