Radiant electric heater with isothermal heat exchange pipe

Abstract

The invention relates to the technical field of electric heating of the industrial process, particularly to a radiant electric heater. The radiant electric heater comprises a furnace body; one end of a housing of the furnace body is provided with an explosion-proof junction box; a heat exchange pipe is arranged in the furnace body; the inner surface of the furnace body of each side of the heat exchange pipe is provided with a plurality of electric heating elements; the surface of the heat exchange pipe is provided with a temperature sensor; the heat exchange pipe is arranged in the furnace body in an S shape; a liquid inlet and a liquid outlet of the heat exchange pipe are located at the same end of the furnace body; the electric heating elements are divided into a plurality of areas to be arranged; the power of the electric heating elements is reduced along the direction from the liquid inlet to the liquid outlet of the heat exchange pipe in turn; the isothermal control is performed on the temperature of the surface of the heat exchange pipe along the direction from the liquid inlet to the liquid outlet through the temperature sensor. According to the radiant electric heater with the isothermal heat exchange pipe, the length of the heat exchange pipe can be reduced and accordingly the material cost is reduced and meanwhile the heat exchange efficiency can be improved and accordingly the service life of the heater is extended.

Description

technical field [0001] The invention relates to the technical field of industrial process electric heating, in particular to a radiant electric heater. Background technique [0002] The existing industrial radiant electric heaters are often composed of a furnace body, an electric heating element arranged in the furnace body, and a heat exchange coil used to exchange heat with the process fluid; the heat exchange coil often adopts a spiral structure or a serpentine coiled up and down. structure, the main drawbacks of this structure are: [0003] 1. A large number of heat exchange tubes are used. The cost of heat exchange tubes accounts for 60-70% of the entire device, and the material cost is very high; [0004] 2. The heat exchange tube structure is often coiled or welded, and the manufacturing cost is also high; [0005] 3. The temperature of the tube wall of the heat exchange tube is high, which affects the service life of the heat exchange tube. [0006] 4. The heat ex...

AI Technical Summary

Problems solved by technology

[0003] 1. A large number of heat exchange tubes are used. The cost of heat exchange tubes accounts for 60-70% of the entire device, and the material cost is very high;

[0004] 2. The heat exchange tube structure is often coiled or welded, and the manufacturing cost is also high;

[0005] 3. The temperature of the heat exchange tube wall is high, which affects the service life of the heat exchange tube

[0006] 4. The heat exchange tube is heated on one side, and the heating is uneven

[0008] 6. Large volume, high external heat consumption and low thermal efficiency

[0009] 7. Heavy weight and large volume increase the transportation cost

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