Energy-saving explosion-proof electric heater for pot

Abstract

The invention relates to an energy saving explosion prevention electric heater for pots, which is provided with a heating device which extends into a pot from the outside of the pot and a flow jet and heat transfer device, wherein the flow jet and heat transfer device consists of a flow jet pump and a flow jet pipe which is connected with the flow jet pump and extends into the pot. A liquid inlet of the flow jet pump is communicated with a liquid storage pot through a liquid suction pipe, and the part of the flow jet pipe extending out of the pot is provided with an electromagnetic scale preventing and scale removing device. The heating device consists of a plurality of electric heating components, and is arranged in a lower position in the liquid storage pot parallel to the flow jet pipe, wherein the electric heating components and the part of the flow jet pipe extending out of the pot are coated with an explosion prevention box, and the inside of the explosion prevention box is provided with a heating monitoring device. The energy saving explosion prevention electric heater can prevent the surface of the electric heater from scaling and coking effectively, and has the advantages of high heat energy transfer speed, high electric heat efficiency, long service life, obvious energy saving effect, good explosion prevention safety performance, convenient operation and maintenance, and the like.

Description

technical field [0001] The invention belongs to the technical field of heating equipment, in particular to an energy-saving explosion-proof electric heater for tanks used for heating chemical liquids such as crude oil stored in tanks. Background technique [0002] In petroleum, chemical and other production, storage and transportation fields, it is often necessary to heat and dilute crude oil or chemical liquids to enhance their fluidity, and have higher requirements for their explosion-proof performance. In the existing heating technology, the heating device usually used is to place a number of electric heating cores in a closed casing, and fill it with heat transfer oil, and then install the heating device in the middle of the oil storage tank. The core generally adopts power frequency electromagnetic heating, mineral heating cable or electric heating tube, etc. The heat generated by the electric heating core heats the heat conduction oil, and the heat is transferred to th...

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Problems solved by technology

[0004] (2) Crude oil is a mixture of various hydrocarbons, often containing solid and semi-solid substances such as asphaltenes, colloids, inorganic substances, and oil-water emulsions; at the same time, crude oil often contains sediment, scale, rust, corrosion products and Biological and other sediments; in addition, there are various salts dissolved, such as bicarbonate, sulfate, chloride, silicate and other sediments, these substances are easy to adhere and deposit on the heat dissipation surface of the electric heater, forming a thermal conductivity The lower heat resistance layer will seriously affect the heat transfer of the electric heater and reduce it, and will induce scaling, carbonization and coking, etc., which will lead to a vicious increase in thermal resistance, greatly reducing the thermal efficiency of the electric heater and reducing energy consumption. greatly increase

[0005] (3) With the prolongation of the use time of the heater, the error between the displayed thermal efficiency index value and the nominal value of the manual will become larger and larger, so that the heat generated by the electric heater cannot be effectively utilized

[0006] (4) Due to the low rate of heat transfer and the influence of adhered dirt and coke, the temperature of the oil stored in the tank has not yet risen to the required set value, while the temperature of the heat transfer oil in the heater has risen to the dry burning protection When the value is above 120°C, the dry burning protection circuit will control the heater to stop working. Due to the limited heat stored in the heat transfer oil, its temperature will soon drop below 120°C, and the heater will restart heating, thus making the electric heater work. In the state of frequent start and stop, the oil temperature of the oil in the tank can not go up all the time, and there are many unheated dead zones, which not only consumes a lot of energy, but also has poor viscosity reduction effect. Silicon-controlled phase-shift control or AC contactor contact control mode, frequent start and stop, easy to cause strong impact on the power grid, serious harmonic pollution, high heater failure rate, poor safety and reliability, high maintenance costs and other disadvantages

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