Three heating methods of high temperature reaction vessel

The high-temperature reaction vessel needs to work under high temperature conditions when carrying out chemical and chemical reactions. According to the different performance of the reaction kettle, there are also various heating methods such as water heating, hot steam heating, other medium heating, and electric heating.
Since the electric heating method is adopted in the reaction kettle, the resistance wire is generally wound on the insulating layer of the stainless steel reaction kettle barrel, or installed on a special insulator at a distance from the reaction kettle. Therefore, between the resistance wire and the stainless steel reaction kettle A small space gap is formed between the bodies. Others need to add a jacket on the kettle body to obtain high temperature. Due to the large temperature change, the jacket and shell of the stainless steel reactor will be subjected to temperature changes and generate temperature differential pressure.

1. Water heating: It can be used when the temperature is not high. The heating system is divided into two types: open type and closed type.

Open type: simple, it consists of a circulating pump, a water tank, a pipeline and a regulator that controls the valve. When high-pressure water is used, the mechanical strength of the equipment is required to be high, and the outer surface of the reaction kettle is welded with a coiled pipe. There is a gap between the coiled pipe and the kettle wall, resulting in The thermal resistance of the reactor increases and the heat transfer effect decreases.

2. Hot steam heating: when the heating temperature of the reactor is below 100 °C, it can be heated with steam below one atmospheric pressure; saturated steam is used in the range of 100~180 °C; when the temperature of the reactor is higher, high-pressure superheated steam can be used.

3. The reaction kettle is heated by other media: if the process requires the reaction kettle to operate at high temperature, or to avoid using a high-pressure heating system, other media can be used to replace water and steam, such as mineral oil (275~300℃), Diphenyl ether mixture (boiling point 258°C), molten salt (140~540°C), liquid lead (melting point 327°C), etc.

4. Electric heating of the new type of reaction kettle: The resistance wire is wound on the insulating layer of the reaction kettle barrel, or installed on a special insulator several distances away from the reaction kettle, so there is no difference between the resistance wire and the reaction kettle body. large space gap.

Using the first three methods to obtain high temperature all need to add a jacket on the kettle body. Due to the large temperature change, the jacket and the shell of the kettle are subjected to temperature changes, resulting in temperature differential stress. Electric heating is adopted, the equipment is light and simple, and the temperature is easy to adjust. At the same time, no pumps, stoves, chimneys and other facilities are required.

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