We also consider (1) process streams with variable heat loads and temperatures, and (2) multiple steam types of variable temperature.
In this paper, the extension of the operating line method (Irazoqui, 1986, Chem. Engng Sci.41, 5) for the optimal synthesis of heat-and-power systems with dominant power load to the more general case of multiple steam levels is made.
It is demonstrated that in the case of parallel heat exchangers utilizing only latent heat, a minimum total steam flowrate is obtained by optimally selecting steam levels, but that in the case of hot liquid reuse, introducing multiple steam levels increases the minimum total steam flowrate attainable under those conditions.
An interesting feature of the optimal solution for the integration problem with multiple steam levels is that integration gaps arise.
In the prediction of productivity in the late stage of multiple rounds of steam stimulation, the dynamic changes in the compression coefficient of reservoirs need to be considered.
In other words, after multiple rounds of steam stimulation in the thermal recovery of heavy oil, the effects of temperature on the compression coefficient gradually decreased.
In order to further study the formation energy in the late stage of multiple rounds of steam stimulation, the influences of different maximum effective confining pressures on the compression coefficient of rocks were analyzed.
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The capital cost was scaled for higher capacity with the six-tenth rule for the CHP plant and the steam dryer, while multiple pieces of equipment of the same size (the maximum size supplied by vendors) were added for steam pretreatment, filter press and anaerobic digester.
