Ammonia decomposition in the thermochemical waste-heat recuperation systems: A view from low and high heating value

Dmitry Pashchenko*, Ravil Mustafin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

This paper is devoted to the investigation of the thermochemical waste-heat recuperation system based on ammonia decomposition. Thermochemical waste-heat recuperation system consists of a reactor, an ammonia preheater, and a condenser. The thermodynamic analysis of the TCR system was performed via Aspen HYSYS software. The heat balance was calculated for the different operating parameters such as temperature (100–700°C) and pressure (1–20 bar). The heat balance showed that in the temperature range from 150–500°C there are heat deficits in the TCR system. To cover this deficit up to 15% of steam from flue gas have to be condensed. For compensating the heat deficit was suggested using a condenser after a preheater. The heat of H2O condensation is covered a significant part of the heat deficit. The heat recovery rate was determined and showed that the TCR system has a maximum efficiency in the temperature range above 500°C and pressure above 20 bar. The heat recuperated in the reactor is 2–5 times higher than the heat recuperated in the preheater. The heat transformation coefficient (ratio between the combustion heat of the ammonia decomposition products and ammonia) is about 1.16 for in the temperature range above 500°C.

Original languageEnglish
Article number114959
JournalEnergy Conversion and Management
Volume251
DOIs
StatePublished - 1 Jan 2022

Keywords

  • Ammonia
  • Decomposition
  • Hydrogen-rich fuel
  • Thermochemical recuperation
  • Thermodynamic analysis

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