2023-07-30 22:00:00
Waste heat is generated heat that is not used, and is therefore released into the atmosphere. It is particularly present in various industrial sectors such as ceramics, metallurgy, glassware, food, construction, etc. Part of the waste heat in these industrial sectors is in the form of hot fumes. Depending on the sector and the industrial process, the fumes released have different characteristics in terms of temperature, composition, flow rate and emission intermittency. To date, waste industrial heat is still undervalued.
The recovery of industrial waste heat by thermocline storage appears to be a potential solution. It is a storage system consisting of an insulating envelope which is filled with a thermal storage material. During the charging phase, the hot fumes generated by an industrial site pass through this envelope and transfer the heat to the storage material. A temperature gradient zone (thermocline zone) is formed within the storage material, which delimits the hot and cold zones. This thermocline gradually moves towards the outlet of the storage envelope. During the discharge phase, a fluid at ambient temperature (for example air) circulates in the system and recovers the stored heat, generating a hot fluid at the outlet. This hot fluid is used and thus the waste heat is recovered.
This article presents the waste heat deposits that are available in France and around the world, the recovery solutions, in particular the thermocline storage solution. Heat transfer fluids and heat storage materials are discussed. An example of a recent industrial application for recovering fumes from a ceramics production site is presented.
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