Process and apparatus for the separation of harmful substances from waste gases, particularly in the drying of wood chips
OwnerGunter Waldmanninventor
Life of this patent
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Abstract
The invention relates to a process and apparatus for drying materials such as wood chips and removing condensable and/or precipitable substances from the resulting waste gas.
Claims27
A process for drying wood chips and/or lacquer comprising providing a stream of hot gas;
- passing the hot gas over the wood chips and/or lacquer to be dried;
- removing the now waste gas from the wood chips and/or lacquer to be dried;
- cooling the waste gas by exchanging heat until the volatile substances carried will condense and/or precipitate concomitantly binding dust and/or similar materials;
- and intermittently burning off the precipitated and/or condensed material.
An apparatus for the separation of fed-in combustible and/or condensable and/or precipitable substances from the waste gas of drying installations comprising:
- a drying chamber;
- a supply line connected to the drying chamber for providing stock to be dried;
- an offtake line connected to the drying chamber for removing dried stock;
- an input to said drying chamber for feeding in hot air;
- an output to said drying chamber for removing waste gas;
- a first heat exchange connected to the waste gas output of the drying chamber and having a waste gas output and having an input and an output for exchange fluid providing for cooling of the waste gas from the drying chamber to a temperature (t.sub.2) for precipitating and/or condensing materials;
- and a burning off device appurtenant to the first heat exchanger for cleaning the same by burning off precipitated of, respectively, bonded combustible materials.
A process for drying wood chips and/or lacquer comprising providing a stream of hot gas;
- passing the hot gas over the wood chips and/or lacquer to be dried;
- removing the now waste gas from the wood chips and/or lacquer to be dried;
- cooling the waste gas by exchanging heat until the volatile substances carried will condense and/or precipitate concomitantly bonding dust and/or similar materials;
- and interrupting the waste gas flow for the purpose of burning off precipitated and/or condensed materials.
A process for drying wood chips and/or lacquer comprising providing a stream of hot gas;
- passing the hot gas over the wood chips and/or lacquer to be dried;
- removing the now waste gas from the wood chips and/or lacquer to be dried;
- cooling the waste gas by exchanging heat until the volatile substances carried will condense and/or precipitate concomitantly bonding dust and/or similar materials;
- and dividing the waste gas flow into several partial flows, which are cyclically interrupted for the purpose of burning off precipitated and/or condensed materials.
A process for drying wood chips and/or lacquer comprising providing a stream of hot gas;
- passing the hot gas over the wood chips and/or lacquer to be dried;
- removing the now waste gas from the wood chips and/or lacquer to be dried;
- cooling the waste gas by exchanging heat until the volatile substances carried will condense and/or precipitate concomitantly bonding dust and/or similar materials;
- and initiating burning off the precipitated and/or condensed materials by sensing the exceeding of a threshold value of the pressure differential of the waste gas at a point before the cooling and at a point after the cooling.
Dependencies are inferred from the claim text.