Abstract
The process flow schematic of fuel-consuming equipment with thermochemical waste-heat recuperation by steam methane reforming with an addition of flue gas to the reaction mixture is suggested. The advantages of such a thermochemical recuperation (TCR) system compared with the TCR system by steam methane reforming are shown and justified. Based on the first law energy analysis, the heat inputs and outputs of the TCR system were determined. To determine the exhaust gases heat transformed into chemical energy of a new synthetic fuel, the thermodynamic analysis by minimizing Gibbs energy via Aspen HYSYS was performed. It was found that with an increase in the mole fraction of combustion products in the reaction mixture, the enthalpy of the methane reforming reaction increases, especially noticeable at the temperature range above 1000 K. Based on the heat, balance of the TCR system was established that the addition of combustion products to the reaction mixture has the following effects: reducing the heat input for steam production in a steam generator; reduction of the steam generator size because of the need to produce a smaller amount of steam in comparison with TCR by pure steam methane reforming; and reducing the amount of heat transferred through the wall of the reformer and, as a consequence, reduction in size of the reformer.
| Original language | English |
|---|---|
| Pages (from-to) | 2216-2226 |
| Number of pages | 11 |
| Journal | International Journal of Energy Research |
| Volume | 43 |
| Issue number | 6 |
| DOIs | |
| State | Published - May 2019 |
| Externally published | Yes |
Keywords
- energy efficiency
- flue gas
- heat balance
- thermochemical recuperation
- waste-heat
