Shell-and-tube hollow sleeve tube resistive heater

Abstract

The invention discloses a shell-and-tube type hollow sleeve tube resistive heater, a heating assembly in the resistive heater are double layer hollow resistive sleeve tubes, each double layer hollow resistive sleeve tube consists of nested inner and outer layer heating tubes, tail parts of every two double layer hollow resistive sleeve tubes are connected via flexible electrode connection sheets, and a U-shaped return circuit can be formed. The shell-and-tube hollow sleeve tube resistive heater is simple and ingenious in structure, high in temperature increase rates, high in efficiency, small in pressure loss, high in convenience of usage and operation, great in fastness, complete in safety protection measures, wide in adjustment scope, high in temperature control precision and high in adjusting speed; problems of a conventional electric heater including non-uniform fluid medium heating and specifically gas heating, poor gas heat exchanging effect, short service life, severe local overheating of electric heating elements and the like can be solved; technology requirements can be reached, and safe and stable production can be ensured.

Description

technical field [0001] The invention relates to the field of electric heaters, in particular to a high-pressure, high-temperature, high-flow, high-power, explosion-proof shell-and-tube type hollow double-tube resistance heater. Background technique [0002] In many industrial processes, the heating of the gas medium is very important, especially for the chemical production process, it is often necessary to heat one or more mixed gases of high temperature, high pressure, poisonous, harmful, flammable and explosive to a certain temperature according to the process requirements , in order to stabilize the reaction and reduce the generation of by-products, the temperature is strictly controlled. At the same time, the gas heating must achieve uniform heating and good heat exchange effect. The electric heating element in the heating system should not have local overheating, so as to avoid other chemical reactions, corrosion or even blown heating elements. [0003] In the prior ar...

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Problems solved by technology

[0007] In view of current problems such as uneven heating of fluid medium, especially gas by electric heaters, poor heat exchange effect of gas, short service life, serious local overheating of electric heating elements in electric heaters, etc., the present invention provides a shell-and-tube hollow The casing resistance heater adopts the direct heating of the hollow double casing resistance, combined with the casing of the shell-and-tube pressure vessel, realizes the direct heating of the high-pressure, high-temperature, large-flow, high-power, explosion-proof shell-and-tube hollow double-tube resistance

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