Back to results
US 11,079,106 B2Granted
Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising multi-fuel burner with a muffle cooling system
AssigneeDouglas Technical Limited
InventorsGünter Hensel, Wolfgang Seifert
Life of this patent
Estimating the term…
Abstract
An apparatus and a method are provided for continuously drying bulk goods, in particular wood fibers and/or wood chips, in a dryer, wherein the drying vapors are led to a dryer circuit, in which the drying vapors are indirectly heated via a heat-exchanger and are conducted to the dryer again.
Claims20
An apparatus for drying bulk goods, the apparatus comprising:
- at least one dryer;
- at least one hot gas generator, the at least one hot gas generator including at least one multi-fuel burner and at least one solid fuel fired hot gas generator;
- at least one heat exchanger configured to indirectly heat a vapor gas mixture for drying the bulk goods in the at least one dryer, said at least one heat exchanger is configured to be heated by a plurality of exhaust gases produced by said at least one hot gas generator;
- at least one branch line, upstream, downstream, and/or within the at least one heat exchanger, the at least one branch line configured to branch off a partial flow of the vapor gas mixture and guide the partial flow of the vapor gas mixture to the at least one hot gas generator;
- and
- at least one line for the remaining partial flow of the vapor gas mixture, the at least one line for the remaining partial flow configured to guide the remaining partial flow to the at least one dryer;
- wherein the at least one multi-fuel burner and the at least one solid fuel fired hot gas generator are configured to be independent or in parallel, the at least one multi-fuel burner including:
- a combustion chamber with a muffle in which a fuel/combustion air mixture is ignited and burned, and
- a combustion chamber ceiling;
- wherein said combustion chamber ceiling comprises
- at least one inlet for combustion air into the muffle,
- an outer nozzle ring forming an inlet for a cooling gas surrounding the muffle, and
- an inner nozzle ring forming an inlet for a cooling gas inside the muffle, the inner nozzle ring configured to provide a laminar flow of cooling gas along the muffle;
- wherein said inner nozzle ring and an outer nozzle ring are configured to be separately controllable and said inner nozzle ring configured to be fed with gas exhausted by the at least one solid fuel fired hot gas generator, with ambient air and/or with gases resulting from external production processes.
11 more elements
A method for continuously drying bulk goods, in at least one dryer, the method comprising:
- supplying the at least one dryer with bulk goods and through which a vapor gas mixture is passed in a drying circuit;
- heating the vapor gas mixture indirectly via at least one heat exchanger by a plurality of exhaust gases, the exhaust gases produced by at least one hot gas generator;
- guiding the vapor gas mixture to the at least one heat exchanger where the vapor gas mixture is heated;
- and
- branching off at least a partial flow of the vapor gas mixture, upstream, downstream, and/or within the at least one heat exchanger, to be conducted into the at least one hot gas generator;
- wherein the at least one hot gas generator comprises at least one multi-fuel burner and at least one solid fuel fired hot gas generator, the at least one multi-fuel burner and the at least one solid fuel fired hot gas generator configured to be independent or in parallel, said at least one multi-fuel burner including:
- a combustion chamber with a muffle in which a fuel/combustion air mixture is ignited and burned, and
- a combustion chamber ceiling;
- wherein said combustion chamber ceiling comprises
- at least one inlet for combustion air into the muffle,
- an outer nozzle ring forming an inlet for a cooling gas surrounding the muffle, and
- an inner nozzle ring forming an inlet for a cooling gas inside the muffle, the inner nozzle ring configured to provide a laminar flow of cooling gas along the muffle;
- wherein said inner nozzle ring and outer nozzle ring are separately controlled and said inner nozzle ring configured to be fed with gas exhausted by the at least one solid fuel fired hot gas generator, with ambient air and/or with gas resulting from external production processes.
10 more elements
Dependencies are inferred from the claim text.