EFFA Calculation Tool Smoke Primary Products

What Are Smoke Primary Products?

When a fuel burns, not all of the material is converted into carbon dioxide and water. A portion of the original material is released as various gases and particles that are collectively known as smoke primary products. These are the directly emitted substances that form the basis for further atmospheric transformation and health impact assessments.

Typical primary products include:

• Carbon monoxide (CO)
• Carbon dioxide (CO) while a greenhouse gas, it is a primary product of complete combustion.
• Oxides of nitrogen (NOx)
• Sulphur oxides (SOx)
• Volatile organic compounds (VOCs)
• Particulate matter (PM. and PM)
• Polycyclic aromatic hydrocarbons (PAHs)
• Formaldehyde and other aldehydes

Understanding the quantity of each primary product is essential for compliance with environmental regulations, for evaluating health risks, and for optimizing combustion processes.

Why Use the EFFA Calculation Tool?

The European Fire and Fuel Analysis (EFFA) Calculation Tool is a webbased application designed to estimate emissions of the aforementioned primary products from a wide variety of combustion scenarios. It is particularly useful for:

1. Regulatory reporting providing the data required by EU Directives, national legislation, and the Global Reporting Initiative.
2. Project feasibility studies assessing the environmental performance of new power plants, industrial furnaces, or wastetoenergy facilities before construction.
3. Operational monitoring enabling plant operators to track emission trends and identify opportunities for improvement.
4. Research and education giving students and scientists a transparent method for calculating emissions from experimental data.

Core Features of the Tool

Feature	Description
Fuel library	Over 150 preloaded fuel types, including coal, lignite, biomass, plastics, and municipal waste.
Combustion models	Incorporates both complete and incomplete combustion equations, with options for staged combustion.
Custom input	Allows users to define custom fuel composition, moisture content, and excess air percentage.
Result export	CSV, Excel and PDF formats for easy sharing and archiving.
Scenario comparison	Sidebyside visualisation of multiple cases, highlighting differences in emissions.
Regulatory thresholds	Builtin limit values for EU, US EPA and WHO standards, with colourcoded alerts.

How the Calculations Work

The tool follows a stepwise procedure that mirrors the physical processes in a furnace:

1. Fuel characterization User supplies the mass fractions of carbon, hydrogen, sulphur, nitrogen, oxygen and ash, together with moisture and ash composition.
2. Stoichiometric combustion The tool computes the theoretical oxygen demand based on the fuel composition.
3. Excess air and efficiency Realworld combustion typically uses excess air. The user enters the percent excess air, and the tool adjusts the flame temperature and conversion efficiencies accordingly.
4. Emission factors Empirical or modelderived factors for each primary product are applied, taking into account temperature, residence time, and pollutantspecific control technologies (e.g., SCR for NOx).
5. Mass balance The final step checks that the sum of emitted species plus the retained ash matches the input fuel mass, providing a diagnostic report.

Input Parameters What You Need to Know

Accurate results depend on reliable input data. The most influential parameters are:

• Carbon content (C%) Determines CO and CO emissions.
• Hydrogen content (H%) Affects water vapour formation and influences the creation of CO, CH and VOCs.
• Sulphur content (S%) Directly linked to SO and, through oxidation, to sulphate particles.
• Nitrogen content (N%) Primary source of NO and NO.
• Moisture (M%) Reduces flame temperature, increasing incomplete combustion products such as CO and PM.
• Ash composition Certain mineral species catalyse the formation of specific pollutants (e.g., calcium reduces SO).
• Excess air (%) Too much air can lower temperature, raising CO, while too little can cause unburned hydrocarbons.

Interpreting the Output

The tool presents results in three main sections:

1. Emission Summary Table

Pollutant	Mass (kg/h)	Specific emission (g/MJ fuel)	Regulatory limit	Status
CO	2850	820
CO	12	3.5	10 g/MJ	Compliant
NO	23	6.7	8 g/MJ	Compliant
SO	8.1	2.3	4 g/MJ	Compliant
PM.	1.2	0.35	0.5 g/MJ	Compliant

2. Graphical Trends

Line graphs display how each pollutant varies with changes in excess air or moisture. Users can hover over points for exact values, making it straightforward to identify optimal operating ranges.

3. Diagnostic Alerts

If the mass balance error exceeds 1%, a warning appears suggesting possible input inconsistencies, such as missing ash components or unrealistic moisture levels.

Case Study Biomass Boiler Optimization

A 5MW biomass boiler burning mixed wood chips was evaluated using the EFFA tool. Initial settings (20% moisture, 15% excess air) produced the results below:

• CO: 450kg/h
• CO: 18kg/h (exceeds the 10g/MJ limit)
• NO: 6kg/h (within limit)
• PM.: 1.8kg/h (just above the 0.5g/MJ limit)

By reducing excess air to 8% and predrying the chips to 12% moisture, emissions changed to:

• CO: 440kg/h (slight reduction)
• CO: 4kg/h (compliant)
• PM.: 0.9kg/h (compliant)

The example demonstrates how simple operational tweaks, identified through the tool, can bring a plant back into compliance while improving overall efficiency.

Integrating EFFA with Other Environmental Tools

Many organisations use the EFFA Calculation Tool as a component of a larger environmental management system (EMS). Typical integration points include:

• Lifecycle assessment (LCA) software EFFA provides the inventory data for the combustion stage.
• Continuous emissions monitoring systems (CEMS) Realtime data can be fed into the tool for dynamic forecasting.
• Carbon accounting platforms CO results are automatically logged for reporting under GHG Protocol guidelines.

Best Practices for Reliable Results

1. Validate fuel analysis with a certified laboratory before entering data.
2. Use the most recent version of the tool; emission factors are periodically updated to reflect new research.
3. Document every input change (e.g., a new fuel batch) to maintain an audit trail.
4. Crosscheck a subset of calculations manually or with an independent software package at least once per year.
5. When modeling control technologies (scrubbers, electrostatic precipitators), include their removal efficiencies explicitly in the scenario.

Conclusion

The EFFA Calculation Tool offers a transparent, flexible, and standardsaligned method for quantifying smoke primary products from any combustion source. By supplying detailed fuel characteristics and operating parameters, users obtain a comprehensive emissions profile that supports regulatory compliance, operational optimisation, and strategic planning. Regular use of the toolpaired with accurate input data and sound engineering judgmenthelps organisations reduce environmental impact while maintaining economic performance.