Regenerative heat exchangers are used for regenerative heat exchange equipment. A solid filler is built in to store heat. Generally, refractory bricks and the like are used to form fire lattices (sometimes with metal wave belts, etc.).
The heat transfer takes place in two stages.
In the first stage, the hot gas passes through the fire lattice, transferring heat to the fire lattice and storing it.
In the second stage, the cold gas is heated through the fire lattice and receives the heat saved by the fire lattice.
These two phases alternate. It is common to use two regenerators alternately, that is, when hot gas enters one, cold gas enters the other. Often used in the metallurgical industry, such as the regenerator of steelmaking open hearth furnace.
Also used in the chemical industry, such as air preheaters or combustion chambers in gas furnaces, regenerative cracking furnaces in man-made oil plants.
Differential wall heat exchanger
In this type of heat exchanger, the cold and hot fluids are separated by a metal so that the two fluids do not mix and transfer heat. In the chemical production, hot and cold fluids are often not in direct contact, so the partition wall heat exchanger is the most commonly used heat exchanger.
Jacket heat exchanger
It is made of a jacket on the outer wall of the container. The heat exchanger is made by installing a jacket on the outer wall of the container, and has a simple structure; however, the heating surface is limited by the wall surface of the container, and the heat transfer coefficient is not high. To improve the heat transfer coefficient and to uniformly heat the liquid in the kettle, the kettle can be heated. Install a stirrer inside. When the jacket is filled with cooling water or a phase change-free heating agent, a spiral partition or other measures to increase the turbulence may be provided in the jacket to increase the heat transfer coefficient on the side of the jacket. In order to supplement the shortage of heat transfer surface, a coil can also be installed inside the kettle. Jacket heat exchangers are widely used for heating and cooling of the reaction process.