CE05 - Une énergie durable, propre, sûre et efficace

Thermochemical hybrid processes for valorization of waste heat in eco-industrial parks – ThermHyVal

Submission summary

This project focuses on several energy key issues: the valorization of low-temperature thermal sources; the growing demand in electricity and cold; the management of the variability of sources and demands by processes able to store heat and restitute electricity and/or cold; the inter-industrial cooperation for the development of eco-industrial parks (EIP), and their extension towards the exchange of several forms of energy (electricity, cooling, heat).

To address these issues, an innovative thermodynamic cycle is proposed. This process is a real technological breakthrough due to its multifunctionality: It is called hybrid because it combines two technologies, sorption processes (mainly thermochemical) and steam power plants, allowing the cogeneration of electricity and/or cold and integrating a storage function. Its development requires expertise in the two scientific and technical fields related to these two technologies.
This process is discontinuous, and operates in two phases:
- a charging phase: the available hot source is used to decompose a reactive solid S, which generates steam, which is then condensed. This working fluid is stored in the liquid state at ambient temperature;
- a discharging phase with production of electricity and/or cold: the condensate feeds an evaporator where evaporation takes place at low temperature to produce a cooling effect. This vapour is then expanded in an expansion device in order to produce electricity. In the reactor, this steam reacts with the solid S in an exothermic synthesis reaction.
Several internal heat or cold recoveries can be integrated into this basic cycle, making it possible to design advanced cycles with improved performances.

The scientific issues involved are as follows:
- the integration of the subsystems constituting the hybrid systems, the adequacy of their operating modes and the optimization of overall performance.
- the mass and thermal couplings between cycle components, a key point for the analyzing these hybrid processes. These couplings can have antagonistic effects on the performance of each component, and evolve over the reaction.
- the dynamic aspects of the process operation with characteristic times of the components that can be significantly different
- the integration of this type of process in eco-industrial parks
- the systemic approach that will have to be developed for EIP, implementing exchanges of several energy forms: this approach will have to consider the modelling difficulties related to the coupling of electricity, steam and cold networks simultaneously. The level of details of the process model will have to be adapted to the industrial system in which it is included.

The expected results are threefold: 1) experimental proof of concept of the hybrid cogeneration process, 2) dynamic simulation tools and analysis of the behaviour of such a hybrid process and its optimization, 3) evaluation of the impact and contributions of this innovative process for EIPs, complemented by a concrete case study.
The project is structured in three tasks addressing different scales: the component, the process and its integration in an EIP by both numerical and experimental approaches:
1) Development of numerical tools for the dynamic analysis of the main components and the process, including the optimization of its performance.
2) Experiments, from the characterization of the expansion device, to the experimentation of the whole hybrid process including a supervision system.
3) Integration of the process in an EIP, from the development of models for the optimization of the exchanges within the EIP, to a case study on real data in order to analyze the contributions of the process and to establish integration guidelines.

Project coordination

Maxime Perier-Muzet (Laboratoire procédés, matériaux, énergie solaire)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

PROMES Laboratoire procédés, matériaux, énergie solaire

Help of the ANR 280,945 euros
Beginning and duration of the scientific project: March 2021 - 42 Months

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