Electrical heater

Abstract

The invention relates to an electrical heater for heating a gas state or liquid state medium containing solid particle matters, belonging to the field of electrical heating device and comprising a medium heating work room and at least one electrical heating core, wherein the electrical heating core is inserted into the medium heating work room and comprises a plurality of electrical heating pipes which are arrayed on a flange cover in a clustering way and fixedly arranged on the flange cover and a plurality of temperature measuring pipes which are distributed within a heating range of the electrical heating pipes and connected with an overtemperature protection circuit. The electrical heater is characterized in that the electrical heating pipes and the temperature measuring pipes are accommodated in a thin-walled metal drum, one end of the thin-walled metal drum is hermetically connected with the flange cover, the other end of the thin-walled metal drum is closed, and gaps between the inner wall of the thin-walled metal drum and the electrical heating pipes and between the inner wall of the thin-walled metal drum and the temperature measuring pipes are filled with cast aluminium casting bodies. The electrical heater can heat the gas state or liquid state medium containing the solid particle matters, and a temperature measuring point of the overtemperature protection of the electrical heater can accurately feed back the temperature state of the integral electrical heating core, thereby preventing damage because of the partial overheating of a part of the electrical heating pipes.

Description

technical field [0001] The invention belongs to an electric heating device, in particular to an electric heater for heating a gaseous or liquid medium containing solid particles. Background technique [0002] Usually, the circulating electric heater selected for the heating of industrial gaseous and liquid media has a basic structure and working principle that one or more electric heating cores composed of clustered electric heating tubes are sealed and inserted into a medium heating working chamber-pressure vessel shell In the body, the heated medium circulates through the shell under a certain pressure, and the heating element of the electric heating core is energized to generate heat, and heats the medium in the form of conduction and convection. However, when the heated medium is a gaseous or liquid medium mixed with a certain amount of solid particles, there will always be solid particles deposited when it circulates through the shell under a certain pressure. The soli...

AI Technical Summary

Problems solved by technology

Solid particles are usually poor conductors of heat. The deposition of such solid particles increases with the continuation of the working time, and finally wraps the electric heating tube, making it unable to dissipate heat locally and the temperature is too high

Since the temperature measurement of over-temperature protection can only be set in individual positions, when the electric heating tube covered by solid particle deposition has no over-temperature protection and temperature measurement locally, the electric heating tube will be locally overheated and burned early, causing the entire electric heating device damage, resulting in heavy losses

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