Enabling Three-Fuel Burner Thermal Oxidation of Sour and NCG-Handling Gases for TNPL’s Paper Mill

Andritz Technologies Pvt Ltd required a reliable,safe, and emission-compliant system to manage complex waste gas streamsgenerated at the TNPL paper mill. The core challenge was to design and supply athermal oxidizer capable of:

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• Safely combusting chemically complex, high-sulphur (sour gas) and NCG-laden gas streams.
• Maintaining critical fuel flexibility by accommodating three different fuels (Methanol, LDO, and Natural Gas) based on fluctuating site availability.
• Ensuring high Destruction and Removal Efficiency (DRE) and compliance with strict emissions and safety standards across varying plant conditions.

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CRA engineered and supplied a fully enclosed,skid-mounted Thermal Oxidizer System featuring an advanced combustiondesign tailored for multi-fuel and high-sulfur gas streams.

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Scope of Supply and Engineering:

The entire solution was designed, manufactured, andfactory-tested in-house by CRA, and delivered as a fully skid-mounted package.The solution included:

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• Custom Three-Fuel Burner: Designed to seamlessly support operation on Methanol, LDO, and Natural Gas.
• Integrated Combustion System: Enclosure, pilot system, forced draft fan, and comprehensive piping.
• Advanced Engineering: Detailed structural design, FEA validation (Finite Element Analysis), radiation and acoustic analysis, electrical engineering, and interlock safety logic.

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CRA provided a robust, ready-to-operate solution bydelivering a skid-mounted unit with fully integrated controls, instrumentation,and full-service commissioning.

CRA’s custom-engineered solution enabled Andritzand TNPL to achieve high-efficiency thermal oxidation of a chemically complexgas stream while maintaining essential operational flexibility and achievingkey environmental targets.

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• Compliance and Safety: The fully integrated oxidizer system allows reliable, safe operation across fluctuating plant conditions, ensuring stable combustion, and meeting all emissions and safety standards.
• Operational Flexibility: The custom three-fuel burner provides critical fuel flexibility, supporting long-term operational reliability despite     variations in site fuel availability.
• High Efficiency: The advanced combustion design successfully handled the high-sulphur sour gas, achieving superior destruction and removal efficiency.

This project is a testament to CRA's expertise indelivering intricately tailored, reliable, and scalable thermal oxidationsolutions.

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Through close collaboration with Andritz and byleveraging its in-house engineering capabilities, CRA successfully mergedspecialized mechanical systems with advanced safety logic, effectively meetingcomplex operational requirements for waste gas management under strictconstraints.

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