Apparatus and method for continuously drying bulk goods, in particular wood chips and/or wood fibers comprising a heat exchanger
AssigneeDouglas Technical Limited
InventorsGünter Hensel, Wolfgang Seifert
Life of this patent
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Abstract
An apparatus and a method is 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.
Claims21
An apparatus for drying bulk goods, in particular of wood fibers and/or wood chips, the apparatus comprising:
- at least one dryer, in particular a drum dryer;
- at least one hot gas generator;
- and
- at least one heat exchanger configured to indirectly heat a vapor gas mixture for drying the bulk goods in the at least one dryer, wherein said at least one heat exchanger is configured to be heated by 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 hot gas generator;
- and
- at least one line for the remaining partial flow of the vapor gas mixture, the at least one line configured to guide the remaining partial flow of the vapor gas mixture to the at least one dryer;
- wherein at least one filter is configured to clean the exhaust gases produced by said at least one hot gas generator, in particular an electrostatic precipitator, preferably a dry type electrostatic precipitator;
- and downstream of said at least one filter, the at least one heat exchanger is configured to indirectly heat gases used as feeding air for said at least one hot gas generator said at least one heat exchanger is configured to be heated by said exhaust gases.
A method for continuously drying bulk goods, in particular wood fibers and/or wood chips, in at least one dryer, in particular a drum dryer, which is supplied with bulk goods and through which a vapor gas mixture passes in a drying circuit, the method comprising:
- heating the vapor gas mixture via at least one heat exchanger, the at least one heat exchanger configured to be heated by exhaust gases produced by at least one hot gas generator;
- guiding the vapor gas mixture to the at least one heat exchanger in which the vapor gas mixture is heated;
- branching off at least a partial flow of the vapor gas mixture, upstream, downstream, and/or within the at least one heat exchanger, the at least the partial flow of the vapor gas mixture to be conducted into the at least one hot gas generator;
- cleaning, by at least one filter, said exhaust gases produced by said at least one hot gas generator, wherein the at least one filter is, in particular an electrostatic precipitator, preferably a dry type electrostatic precipitator;
- and
- downstream of said at least one filter, the exhaust gases produced by said at least one hot gas generator are used by the at least one heat exchanger to indirectly heat gases used as feeding air for said at least one hot gas generator.
The method according to claim 0, wherein the filter is operated in suction mode, wherein preferably at least one hot gas generator exhaust gas fan is located downstream from the at least one filter.
The method according to claim 0, wherein said exhaust gases are passed through at least one hot gas cyclone which is between the at least one hot gas generator and the at least one heat exchanger.
21-29. (canceled)
Dependencies are inferred from the claim text.