Why are oil refineries and chemical companies abandoning steam heating in favor of electric appliance heating?

Published on:

2022-09-19 11:34

In the daily production of refineries and chemical plants, there are many kinds of substances that need to be detected by instruments, and the physical properties of different substances are also different, such as temperature, viscosity, melting point, etc. D. In winter, in colder regions, the material will undergo physical phenomena such as freezing viscosity increase, crystallization, etc. D., which will result in clogging of the material, abnormal feedback signal through the instrument and serious direct damage to the instrument equipment. In view of the above, in order to ensure stable 24-hour operation of the device, it is necessary to take appropriate anti-freezing measures for various physical properties of different materials. As a rule, there are two measures to protect the appliances from freezing and heat preservation: one is steam heating and heat preservation, and the other is heat preservation through electric heating.

Refineries and chemical plants in my country used to use steam heating systems, but due to the low degree of control automation, low heat conversion rate and large and complex matching equipment, high maintenance costs, low efficiency and other disadvantages, steam heat electric heating is completely replaced by electric heating. The electric heating has a small heating temperature gradient, high power, stable and long life, can realize digital, remote, automatic control, simple equipment installation, long service life, no pollutant emissions and many other advantages that the steam heater cannot achieve.

The working principle of the instrument's electric heating system is to transfer the heat emitted by the electric heating means to the instrument and its pipelines, which must be heated and kept warm, through indirect or direct energy exchange, in order to achieve the purpose of heating and heat preservation. The electrical heating system of appliances, as a rule, consists of an electric heating cable with an automatic temperature control function, which is wound or laid flat on the surface of the instrument pipe or tank in a certain way, and a thermal insulation material is added outside. With automatic temperature control sensor to achieve automatic and constant temperature control of the instrument, so that it can operate in the most reasonable and economical condition to improve production efficiency and reduce production costs.

A complete electrical heating system of appliances usually consists of six parts: a power connector, an electric heating cable, an electric heating end junction box, a three-way junction box, a two-way junction box, an insulation layer, a moisture proof layer and a harness. These 6 parts support the same thing, one link and one link, any problem in any link will cause the electrical heating system of the device to fail.

Tool heating cables are generally divided into two types: constant power heating cables and self-regulating heating cables. The constant power electric heating cable has significant advantages, such as high thermal efficiency, constant power, long service life and long service life. The use of low-voltage power supply makes it possible to realize small equipment area and precise control; self-adjustable point output of the heating cable. Temperature changes. With the ambient temperature changes. As the depth of the outside increases, its output power will decrease, and vice versa, increase. This point heating cable is suitable for rooms where the ambient temperature difference changes and changes greatly. Compared with the constant power electric heating belt, the self-regulating heating belt has the advantages of energy saving, as well as the advantages of uniform heating, simple design, low transportation costs and free cutting.

Although a one-time investment in an electric-heated automatic temperature control system used in oil refineries and chemical plants is high at an early stage, operating costs are low and production efficiency is high, which can greatly improve the economic impact of the enterprise. Electric tool heating can be used under special conditions, with explosion protection function, all weather operation and long service life, on average more than 8 years, there will be no liquid leakage and pollution.

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