ammonia-combustion-psr-nox-control-

A numerical study of ammonia combustion in a Perfectly Stirred Reactor (PSR) focusing on the effects of equivalence ratio and inlet temperature on pollutant emissions (NO, NO₂, N₂O, and unburned NH₃), with the aim of developing strategies for low-NOx combustion.

Ammonia Combustion in PSR for NOx and Pollutant Control

📌 Overview

This repository contains a numerical study of ammonia (NH₃) combustion in a Perfectly Stirred Reactor (PSR). The study investigates the effect of inlet temperature and equivalence ratio (ϕ) on:

• Pollutant emissions (NO, NO₂, N₂O)
• Unburned ammonia (NH₃ slip)
• Combustion temperature trends

The long-term objective is to develop insights for a low-emission, low-NOx ammonia combustor.

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⚙️ Method

• Tool used: ANSYS Chemkin-Pro (Aurora + Reactor Network)

• Reactor model: Perfectly Stirred Reactor (PSR)

• Operating conditions:

  • Pressure: 1 atm
  • Inlet temperature: 298 K, 600 K, 900 K
  • Equivalence ratio sweep: 0.6 → 1.3
  • Residence time: typically 0.01 s (varied in some cases)

• Output species tracked: NO, NO₂, N₂O, NH₃, O₂, H₂O, radicals (H, OH, HO₂)

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📊 Results

The study produced trends for:

1. Temperature vs ϕ → maximum temperature observed near slightly rich conditions.

2. NO, NO₂, N₂O vs ϕ →

   • NO decreases with higher ϕ (fuel-rich).
   • NO₂ and N₂O levels also decrease, but with different magnitudes.

3. Unburned NH₃ vs ϕ → increases rapidly under rich conditions (ϕ > 1).

4. Effect of inlet temperature (298 K → 900 K) → higher Tin leads to higher peak combustion temperatures and alters pollutant distributions.

👉 (This section will be expanded with your actual plots and key takeaways once you upload the PPT.)

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📈 Plots

All simulation results are summarized in the plots/ folder and the presentation slides (results_presentation.pptx).

• φ vs Temperature
• φ vs Pollutant emissions (NO, NO₂, N₂O)
• φ vs NH₃ slip
• Comparison of different inlet temperatures

👉 Will embed graphs here once available.

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🛠 Requirements

• ANSYS Chemkin-Pro (Aurora module)
• Python 3.x (optional, for post-processing)
• Excel (for quick CSV handling)

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🚀 How to Use

1. Open the Chemkin input files (input/) in Aurora.
2. Run PSR simulations with the specified equivalence ratio sweep.
3. Export CSV outputs for pollutants and temperature.
4. Use Excel/Python scripts in analysis/ to generate plots.

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📚 Citation

If you use this work, please cite as: Dipendra K. Dewangan, “Parametric Study of Low-Emission Ammonia Combustion in PSR Reactors,” M.Tech Thesis, IIT Kanpur, 2025.