SU1223989A1 - Reactor with electrothermal fluidized bed - Google Patents

Description

The invention relates to high-temperature installations with an electrothermal fluidized bed, widely used in many industries, and can be effectively used for heating or chemical-thermal treatment of metal products (cementation, carbonitriding), conducting high-temperature chemical reactions (for example, carbon disulfide)

The purpose of the invention is to improve the quality of the processed products and the reliability of the reactor operation by eliminating erosion and lowering the temperature of the electrodes.

The drawing shows schematically the reactor section.

The reactor includes a housing 1, a gas distribution grid 2, a fluidized electrothermal layer 3 and electrodes 4 with insulators 5, fixed bedding of electrically conductive particles 6 and elements of non-conducting material 7.

The reactor operates as follows. .

In case 1, a fluidizing agent is supplied through the gas distribution grid 2, for example, air, nitrogen or the required gas, and a layer of electrically conductive particles 3 is fluidized, for example, graphite or cryptol fraction 0.2-1.0 mm. An electric current is then passed through the layer 3 by means of the electrodes 4. When an electric current passes through the electrically injected particles of the layer 3, the electrical energy is converted into heat, in

Editor M. Dylsh

Compiled by A. Telesnitsky

Tehred G. Gerber, Proofreader V. Sinitska

Order 1860/7 Circulation 527

VNISHI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PIP Patent, Uzhgorod, st. Project, 4

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five

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five

the result is that the fluidized bed 3 is quickly heated j to the required temperature. Electric insulators 5, for example, alundum tubes, are installed on the upper part of electrodes 4, and elements from are mounted on the lower part. non-conductive material 7, for example, in the form of plates or disks of refractory ceramics (chamotte, alumina, etc.).

Electrodes 4 are separated from the high-temperature particles of layer 3 by a fixed bed of electrically conductive particles 6. Electroconductive material particles thrown on the plates 7 replenish the burnt particles of dense backfill 6, and excess particles fall back along the inclined plane oi 30-34) in the fluidized bed 3. A fixed bed of electrically conductive particles 6 makes it possible to avoid sparking near the electrodes, i.e. their erosion. In addition, the bedding of particles 6 near the current leads is a satisfactory thermal insulation from the hot fluidized bed 3, since the thermal conductivity of the fixed LAYER of particles is ten times smaller than the effective thermal conductivity of the fluidized bed. Own heat gap in the net- Vision backfill is small, since it is connected in series with the fluidized bed zone, the resistivity of which is many times (5-10 times) greater.

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Claims (1)

ELECTROTHERMAL BOILING LAYER REACTOR, comprising a housing with an electrically conductive finely dispersed material, a gas distribution grid and electrodes lowered into the layer, characterized in that, in order to improve the quality of the processed products and the reliability of the reactor by eliminating erosion and lowering the temperature of the electrodes, it is equipped with non-electrodes fixed to the electrodes gas-tight elements made in SU „„ 1223989 »1223989