Exhaust filter system

An exhaust filter system for filtering a creosote component from exhaust gases of a combustion chamber burning wood, which comprises an airtight filter apparatus arranged between a combustion chamber outlet for the exhaust gases and a flue for removing the filtered exhaust gases, the filter apparatus including a distributor head defining a gas distributing chamber in communication with the combustion chamber outlet and receiving hot exhaust gases therefrom, and a gas collecting chamber in communication with the flue and delivering filtered exhaust gases thereto, a heat transfer plate airtightly separating the distributor head into the distributing and collecting chambers, a heat exchange unit airtightly connecting the gas distributing and collecting chambers, the heat exchange unit defining a vertical flow path including a first vertical flow path leg receiving the hot exhaust gases from the distributing chamber and a second vertical flow path leg in series with the first flow path leg, the second flow path leg receiving the exhaust gases from the first flow path leg and delivering the gases to the collecting chamber, whereby the gases are progressively cooled as they pass through the flow path to a temperature range wherein the creosote component present in the hot exhaust gases in vaporized form is condensed to a liquid, and a sump mounted to receive the condensed liquid by gravity from the heat exchange unit, the heat transfer plate transferring heat from the distributing chamber at the beginning of the flow path to the collecting chamber at the end of the flow path for reheating the cooled gases and thereby thermally to induce a natural draft for the exhaust gases from the combustion chamber outlet to the flue.

An exhaust filter system for filtering a creosote component from exhaust gases of a combustion chamber burning wood, the filter system being integrated with an airtight wood burning stove including the combustion chamber and being arranged laterally adjacent the combustion chamber, which comprises an airtight filter apparatus arranged between a combustion chamber outlet for the exhaust gases and a flue for removing the filtered exhaust gases, the filter apparatus including a gas distributing chamber in communication with the combustion chamber outlet and receiving hot exhaust gases therefrom, a gas collecting chamber extending above the combustion chamber and in communication with the flue and delivering filtered exhaust gases thereto, a heat exchange unit airtightly connecting the gas distributing and collecting chambers, the heat exchange unit defining a vertical flow path for the exhaust gases between the gas distributing and collecting chambers and being capable of cooling the gases to a temperature range wherein the creosote component present in the hot exhaust gases in vaporized form is condensed to a liquid, a sump mounted to receive the condensed liquid by gravity from the heat exchange unit, and a heat transfer plate mounted between the combustion chamber and the gas collecting chamber for transferring heat from the combustion chamber to the collecting chamber at the end of the flow path for reheating the cooled gases and thereby to induce thermally a natural draft for the exhaust gases from the combustion chamber outlet to the flue.

An exhaust filter system for filtering a creosote component from exhaust gases of a combustion chamber burning wood, which comprises an airtight filter apparatus arranged between a combustion chamber outlet for the exhaust gases and a flue for removing the filtered exhaust gases, the filter apparatus including a gas distributing chamber in communication with the combustion chamber outlet and receiving hot exhaust gases therefrom, a gas collecting chamber in communication with the flue and delivering filtered exhaust gases thereto, a heat exchange unit airtightly connecting the gas distributing and collecting chambers, the heat exchange unit being comprised of two rows of vertically extending heat exchange tubes defining a vertical flow path for the exhaust gases between the gas distributing and collecting chambers and being capable of cooling the gases to a temperature range wherein the creosote component present in the hot exhaust gases in vaporized form is condensed to a liquid, and two tube plates attached to respective ends of the tubes, the two rows being arranged back-to-back, a housing surrounding the heat exchange tubes, a coolant liquid circulating through the housing and surrounding the heat exchange tubes, and a sump mounted to receive the condensed liquid by gravity from the heat exchange unit, the filter apparatus being arranged to provide a natural draft for the exhaust gases from the combustion chamber outlet to the flue.