What are the requirements for the coal-fired boiler used in the food industry?

1. Steam Quality and Stability
High steam purity: No contamination by coal ash, soot, or other impurities.
Stable steam output: Constant pressure and temperature to ensure consistent food processing results.
2. Hygiene and Safety
No direct contact: Boiler water, combustion gases, or particulates must not come into contact with food.
Proper water treatment: To prevent scaling, corrosion, and contamination.
Regular cleaning and maintenance: Prevents microbial growth and buildup of residues.
3. Emission Standards
Adherence to environmental regulations: Limits on SO₂, NOₓ, particulate matter, and CO emissions.
Dust collectors and scrubbers: Installation of filtration and scrubbing systems to reduce emissions.
Ash handling: Safe disposal or treatment of coal ash to avoid contamination.
4. Energy Efficiency
High thermal efficiency: To minimize fuel consumption and operational costs.
Heat recovery systems: Use of economizers or air preheaters to improve efficiency.
5. Automation and Control
Automated controls: For fuel feeding, combustion, blowdown, and water supply.
Safety interlocks: To prevent accidents and ensure safe operation.
6. Material and Construction
Food-grade materials: For any part in contact with process steam or water.
Corrosion-resistant alloys: Especially in water tubes and steam lines.
7. Compliance and Certification
Comply with local boiler codes: ASME, CE, or relevant national standards.
Periodic inspection and certification: By authorized bodies.
8. Installation and Siting
Adequate ventilation: To prevent buildup of harmful gases.
Safe distance from food processing areas: To reduce contamination risk.
9. Water Quality
Boiler feedwater treatment: Deaeration, softening, and chemical dosing to prevent scaling and corrosion.