Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Using microwave energy
Patent
1994-05-11
1996-07-30
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Using microwave energy
422173, 422198, 422186, 422110, 422108, 60275, 110250, A61L 200, F23G 500
Patent
active
055408869
DESCRIPTION:
BRIEF SUMMARY
The most environmentally friendly elimination of gaseous organic air pollutant substances resulting from technical processes is conventionally realised by thermal after-burning. A support firing is generally required and employed in order to provide adequate conversion of the organic compounds.
In thermal after-burning, fossil fuel--adapted to the hydrocarbon content of the waste gas--is additionally burnt in order to ensure the necessary thermal reaction efficiency.
Catalytic processes require additional energy, dependent on substances and concentrations, at least in the starting phase, which energy is generally realized by a combustion device. Mechanical and thermal stability as well as the rate of deactivation of the catalysts thereby substantially determine the economic efficiency for the operator and restrict the range of possible applications.
The object of the invention is to find an available process and a device for carrying out the process which enable a simple, environmentally friendly and economical treatment of the gas.
This object is achieved with the features of the invention hereinafter described.
In the process according to the invention microwave heating of the gas takes place which replaces a support firing and can not only be more simply controlled and adapted to the necessary conditions, but is also more effective since with microwave heating the available surface of the body, through which the gas to be treated is conducted, participates in the gas treatment, in this case the heating of the gas. As a result, an oxidative conversion of the component pollutant substances is ensured with the invention, without additional production of secondary air pollutant substances (such as carbon dioxide and nitrogen oxides) resulting from a support firing. A reliable treatment of the gas is thereby achieved, in particular the conversion of problematic hydrocarbon systems, which is of particular importance for thermal after-burning devices and processes. Moreover, favourable effects can be achieved with the invention by using specific quasi-catalytic additional effects, in particular with waste gas components with polar molecular properties.
A further advantage is provided in the reliable process design with a simple control or regulation taking into account the parameters available, such as temperature and pressure in the region of the device.
The above-mentioned advantages are also achieved with the device according to the invention, which device is distinguished by a simple construction with a simple and reliable function. A small and compact construction is also achieved because the reactor and the burner form one unit. It is thereby advantageous to design the surface of the body in contact with the gas to be as large as possible. Preferably a fibrous or porous material is suitable for this purpose, through which material the gas is led. The material is completely or at least partly microwave absorptive material, e.g. SiC or C, which is suitable for bearing oxidative action and which is manufactured accordingly. When the thus-formed reactor or burner is acted upon, the material is excited by the microwaves so that, on its way through the material, the gas flow receives an even indirect heating and, in particular in the case of after-burning of waste gas exploiting the combustion enthalpy contained--corresponding to the proportion of hydrocarbons, as well as possibly additionally exploiting the self-excitation effect of waste gas molecules through direct microwave action, is converted evenly in an oxidative manner.
The control of the treatment process, with regard to the heating and/or the gas quantity and/or the gas composition, taking into account the process parameters such as temperature and pressure, can take place in, in front of and/or behind the body. As a result, it is possible in an advantageous manner to reduce the microwave energy with increasing temperature and to increase the microwave energy with falling temperature, so that regulation to a selectable actual temperature value can b
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Birnkraut Ingo
Klinge Bernd
Lautenschlager Werner
Warmbier Bernd
Gossler Feuerfest- und Isoliertechnik GmbH
Tran Hien
Warden Robert J.
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