A spiral electric heating device for high temperature and high pressure gas

Abstract

The invention discloses a spiral electric heating device for high-temperature high-pressure gas, and relates to an electric heating gas device. A heating core is arranged in an inner barrel, and in other words, a resistance electric heater electric heating tube is arranged in the inner barrel. A heat-proof heat insulation material is laid on the outer wall of the inner barrel, and a protective layer is laid on the exterior of the heat insulation material. A spiral guide plate is welded to the inner wall of an outer barrel, a ceramic screw rod is installed in the resistance electric heater electric heating tube, a spiral guide plate is welded to the inner wall of the outer barrel, the spiral guide plate is provided with one head or two heads or multiple heads, the ceramic screw rod is provided with one head or two heads or multiple heads, a metal core bar is arranged in the center of the ceramic screw rod, and the ceramic screw rod is formed by being sleeved with one or more ceramic parts in series. The protective layer outside the heat insulation material is made of a low-emissivity material such as a thin copper plate and a galvanized sheet or made of chromium plated with a layer of low-emissivity material or silver plated with a layer of low-emissivity material or made of other metal materials with low emissivity or nonmetal materials with low emissivity. According to the spiral electric heating device, energy is saved, and the spiral electric heating device is durable, and especially suitable for occasions with heated gas high in pressure and large in temperature rise.

Description

technical field [0001] The invention relates to a gas electric heating device, in particular to a spiral 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: Convective heat exchange is performed between the exposed heating wire and the gas, and the gas directly flushes the 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 fall off and affecti...

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] Since there is no forced diversion, the rotational momentum of the airflow in the channel between the outer cylinder and the inner cylinder decays quickly, and the cooling effect of the outer cylinder is not obvious; The airflow in the electric heating tube scours longitudinally, the heat transfer coefficient is low, and the wall temperature is still high, especially when heating high-temperature gas, the electric heating tube is easily deformed by heat; When the heated gas flows through multiple electric heating tubes arranged in parallel, the flow deviation is large. The reason is that the flow resistance in the electric heating tube accounts for a small proportion of the flow resistance of the entire equipment, which is easy to cause a large flow deviation, while the electric heating with a small flow rate The tube is easy to cause overheating of the tube wall and damage the equipment

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