The reverse water gas shift (RWGS) reaction can convert CO2 into useful industrial raw materials, which meets the
requirement and trend of carbon-neutral energy development. For the one-dimensional tubular plug flow RWGS reactor,
the heat transfer process was assumed to obey the linear phenomenological heat transfer law 〈q∝Δ(Τ-1)〉. Under the
conditions that all of the CO yield, inlet temperature, inlet pressure and inlet compositions were given and the temperature
of the heat source outside the tube was fully controllable, the minimum total entropy generation rate (EGR) of the RWGS
reactor and the corresponding optimal temperature distribution of the heat source outside the tube were solved by applying
finite time thermodynamics and optimal control theory. The optimization results were further compared to the
performances of two reference reactors with the constant and the linear heat source temperatures and those for the case
with Newtonian heat transfer law 〈q∝Δ(Τ)〉. The results show that optimizing the heat-source temperature distribution
could reduce the total EGR of the RWGS reactor by more than 48% compared to those of the two reference reactors, and
the main reduction is the EGR in heat transfer and chemical reaction processes; heat transfer laws have significant effects
on the minimum total EGR of the RWGS reactor and the corresponding optimal temperature distribution of the heat source
outside the tube. The obtained results in this paper have certain guiding significance for the design of RWGS reactors in
actual engineering.
Based on the theory of finite-time thermodynamics(FTT), the model of the one-dimensional plug flow reactor for CO2 hydrogenation to light olefins unit with fully temperature controllable heat source temperature and the linear phenomenological heat transfer law is established and optimized. Under the condition of a given decene (C10H20) yield, the optimization objective is to minimize the production of entropy rate. The optimal process configuration for the minimum production of entropy of the reactor is obtained and compared with the reference reactor with constant heat source temperature and optimization results for the case with Newtonian heat transfer law. It shows that the production of entropy of the optimal reactor is reduced by 45.82% compared with the reference reactor. The optimal configuration of the heat source temperature has a rapid decrease firstly, then a rapid increase and a slow decrease finally. The heat transfer law is one of the important factors which affect the production of entropy minimization of the reactor. The obtained results in this paper have a certain theoretical guidance for the optimal design and operation of CO2 hydrogenation to light olefins unit reactor in engineering.
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