SU205989A1 - - Google Patents

Description

COOPER ELECTRIC GAS HEATER

In the cooper preheater, the working gas is periodically heated due to the heat accumulated during the preheating of the C17 social packing.

The superheater heaters, widely used in various parts of the equipment, are heated by hot gas flowing through the nozzle and then switched to blowing through the heated working gas. The use of electric heating nozzles eliminates significant heat loss carried away by the heating gazamp.

The large accumulative capacity of the Kouper electric gas preheater allows for a short period of time to develop a large thermal power, much higher than the installed electric power of the heaters, which heat the nozzle in a continuous mode.

The latter is important, for example, for modern periodical wind tunnels, which require high power for their operation, which are difficult to achieve with the use of the well-known electric preheating of gels with a low storage capacity.

requiring extreme short term heat loads

A distinctive feature of the described superheater is dense

packaging elements of the nozzle, which are embedded electric heaters as part of it. Pa figs. 1 shows a general view of a cooper electric gas preheater; in fig. 2 - arrangement of nozzle elements; in fig. 3 - fastening of heater conductors.

Thermally insulated shell / filled with accumulator. Nozzle 2, through which heated gas passes through narrow channels.

In the mixer 3, where, in order to maintain a constant temperature of the outlet gas stream, an additional controlled gas supply is carried out. Greater storage capacity is achieved by tightly packing the packing elements (see Fig. 2), which are round rods 4 made of heat-resistant heat-conducting material, between which evenly over the cross section are located

metal tubes 5, inside of which the conductors of the electric heater 7 are placed on the ceramic rings 6 (see Fig. 3). The pairing diameter of the tube 5 is equal to the diameter of the accumulating rods 4, thanks to

filling the volume with a composite nozzle and a uniform distribution of the heated gas along parallel narrow channels between its elements. The length of the rods can be composite.

The arrangement of the packing elements shown in FIG. 2, where there are two accumulating batteries for each heating element, contributes to the uniform heating of the entire volume of the nozzle.

The small equivalent diameter of the nozzle channels, the heat removal surface is well developed, and the high thermal conductivity of the element material ensures the rapid transfer of the accumulated heat to the heated gas.

Depending on the voltage of the electrical power source and the required power, the resistance of the heaters is selected by sequential and parallel connection of the conductors of the heating elements.

Powered Kauper electric gas heater as follows. Without a gas supply, the electric heaters are powered on and heated up. Upon reaching the maximum allowable temperature of the nozzle (1000 ° C), short-term blow-through of a heated gas is produced. A constant outlet temperature is maintained by redistributing the amount of cold gas supplied to the inlet and to the mixer. Upon reaching the minimum allowable temperature of the nozzle, the gas supply is stopped and the next heating of the nozzle is performed. Electric power when the gas is heated can be turned off.

Subject invention

A cooper electric gas preheater, for example, air for wind tunnels, having a thermally insulated shell, an accumulator nozzle and a mixer for

displacing cold gas in the process of controlling the outlet temperature of the stream, characterized in that, in order to increase the storage capacity of the nozzle and accelerate heat transfer to the heated gas, densely packed cylindrical rods of heat-resistant heat-conducting material are used as the nozzle, metal tubes with an outer diameter equal to the diameter of the rod of the nozzle, inside which the conductor is supported on ceramic rings are placed an electric heater.

EVP

2

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