Tang Lian Chemistry


Heating method of stainless steel reactor

When choosing a stainless steel reactor, the selection of heating methods for stainless steel reactors is generally related to these issues. After determining these issues, the selection is generally based on these five heating methods.
Firstly, according to the heating/cooling method, it can be divided into electric heating, steam heating, hot water heating, thermal oil circulation heating, far-infrared heating, outer (inner) coil heating, jacket cooling, kettle inner coil cooling, electromagnetic heater heating, etc. The choice of heating method is primarily related to the heating/cooling temperature required for the chemical reaction and the amount of heat required.
The characteristics and uses of various heating methods for the reactor:

  1. Hot water heating: It can be selected when the temperature is not high, and the heating system is divided into two types: open and closed. Open and simple, it is composed of a circulating pump, water tank, pipeline, and a regulator that controls the valve. When using high-pressure water, the equipment requires high mechanical strength, and the outer surface of the reaction kettle is welded with a snake tube. There is a gap between the snake tube and the kettle wall, which leads to increased thermal resistance and reduced heat transfer effect of the reaction kettle.
  2. Steam heating: When the heating temperature of the stainless steel reactor is below 100 ° C, a steam below atmospheric pressure can be used for heating; Use saturated steam within the range of 100-180 ° C; When the temperature of the reacor is higher, high-pressure superheated steam can be used.
  3. Reverse application of heat transfer oil heating: If the process requires the reactor to operate at high temperatures or to prevent the use of high-pressure heating systems, other media can be used instead of water and steam, such as mineral oil (275~300 ° C), boiling point of diphenyl ether mixture (258 ° C), molten salt (140~540 ° C), liquid lead (melting point 327 ° C), etc.
  4. Stainless steel reactor electric heating: Wrap the resistance wire around the insulation layer of the reaction kettle shell or install it on a special insulation body several intervals away from the reaction kettle, thus forming a small spatial gap between the resistance wire and the reaction kettle body.
  5. Electromagnetic heater heating: The heating temperature of the reactor electromagnetic heater can reach 500-550 degrees. The electromagnetic coil is directly wrapped around the outside of the tank body to generate a magnetic field, causing the tank body to heat up, while the coil itself does not heat up. With a wrapped insulation layer, the thermal efficiency can reach over 95% and the service life is over 15 years,
    To obtain high temperature using the first three methods, it is necessary to add a jacket on the kettle body. Due to the large amplitude of temperature change, the jacket and shell of the kettle bear temperature changes and undergo thermal stress. Using an electromagnetic heater for heating, the equipment is lightweight and convenient, and the temperature is easy to adjust. At the same time, do not use equipment such as pumps, furnaces, chimneys, etc. The operation is very simple, with low risk, low cost, energy-saving, emission reduction, and high-temperature explosion-proof! It can replace heat transfer oil, open flame, and steam heating.

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