Моделирование энергосберегающих промышленных установок с термохимической регенерацией

Abstract

The article explains importance of elaborating scientific and technical solutions aimed at creating energy-saving and environmentally friendly technologies based on thermochemical recovery (TCR) of the heat of natural gas combustion products. To address this challenge, the authors propose to use the SCAN (Steam Conversion Analyzer) software package, a computation system based on the results from numerical investigation of the processes that occur during thermochemical heat recovery and intended for providing the necessary information support to specialists in charge for developing process flow diagrams involving the use of TCR. A characteristic feature of the above-mentioned software system is that it combines mathematical models intended for calculating process flow diagrams (represented by lumped-parameter or system models) and models for calculating hydrodynamic and heat-and-mass transfer processes accompanied by chemical reactions in the apparatuses included in the composition of process flow diagrams (represented by distributed-parameter or detailed models). The SCAN package allows the user to select packages and subroutines that make it possible to minimize the computation time and resources required to perform the computation. In addition, the system includes features for tracking how the values of sought characteristics depend on the degree of detail (accuracy) of the model describing the process under study. The SCAN software system includes a library module containing the process flow diagrams of installations and individual apparatuses within their composition. Each example is supplemented with recommendations for modeling and arranging the processes, which were obtained as a result of numerical calculations. Two examples of using the SCAN software system for elaborating circuit solutions and simulating the processes involving TCR are given. The first example is devoted to the scheme for analyzing the TCR of the heat of gas turbine exhaust gases, and the second one is devoted to modeling the processes according to an algorithm combining system and detailed calculations. It is pointed out that the SCAN software system offers the possibility to study the effect the design features of apparatuses (including the design of reaction elements that make up the conversion reactor) and the process operating parameters have on the conversion completeness degree. It also allows the user to evaluate the saving of fuel in a production process or in generating electricity.