Sleeve-type electric heating device for high-temperature and high-pressure gas

Abstract

The invention discloses a sleeve-type electric heating device for a high-temperature and high-pressure gas, and relates to an electric heating gas device. The sleeve-type electric heating device comprises a heating core body composed of metal sleeves which are coaxial and with different diameters, and a central ceramic spiral rod, wherein the heating core body is used as a resistor heat release body for releasing heat, and also forms a channel for the gas flowing while being heated; the quantity of inner barrels, and the wall thickness and the material of each inner barrel are changeable to adapt the differences of heating powers and heating final temperatures, and a layer of a low-emissivity material is capable of being selectively plated or coated on the inner surface and the outer surface of each inner barrel so as to reduce the mutual radiation heat exchange between the wall surfaces of the inner barrel; the outer-layer heat release power of the heating core body is low, and the wall temperature of the inner barrel is low. According to the sleeve-type electric heating device disclosed by the invention, the wall temperature of a housing and the wall temperature of the resistor electric heating body are effectively lowered, the consumption of precious metal materials is saved, and the manufacturing cost is reduced; moreover, the service life and the heat efficiency of the device are prolonged and increased, and the device is especially suitable for occasions with high gas pressures and high temperature rises.

Description

technical field [0001] The invention relates to an electric heating gas device, in particular to a sleeve type electric heating device for high temperature and high pressure gas. Background technique [0002] Gas heating, especially air heating technology, is widely used in production processes such as combustion, drying, heating, heating and heat preservation, and even in various occasions in life. Heating gas with electric energy is widely used due to its high efficiency, cleanliness, and convenient temperature control. [0003] At present, the domestic general gas heating technology adopts the following schemes: The exposed electric heating element is used for convective heat exchange with the gas, and the gas directly flushes the electric heating element. The problem with this method is that when heating oxidizing gases such as air, the surface temperature of the electric heating element is high, and it will be heated for a long time in the gas, causing the scale to f...

AI Technical Summary

Problems solved by technology

The problem with this method is that when heating oxidizing gases such as air, the surface temperature of the electric heating element is high, and it will be heated for a long time in the gas, causing the scale to fall off and affecting the cleanliness of the gas.

But this method also brings other problems: the protective sleeve outside the heating element affects the heat dissipation of the heating element, and when the temperature of the heating gas is high, the temperature of the heating element itself is too high

The common problems of the above equipment are: the short life of the electric heating element, the problem of scale shedding, low thermal efficiency, large equipment structure, and high cost of electric heating element materials

[0015] The common problems of channel-type air heaters are: the gas flows through the heating channels arranged side by side at one time; Large temperature difference between inlet and outlet equipment

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