Understanding the Science of Burning Waste Gas in Fired Heaters

Burning waste gas in fired heaters is an integral process. Tapping into this practice provides a sustainable means to dispose of waste gases while simultaneously fueling the heaters, ultimately promoting energy efficiency and economic savings.

This discussion is oriented towards engineers and professionals in the oil and gas sector who appreciate the value of precise and technically in-depth explanations. Here, we will dissect the intricacies of burning waste gas, explore the chemical and mechanical considerations, address environmental impacts, and suggest best practices for optimizing the process.

The Chemistry of Combustion

Combusting waste gas in fired heaters involves a complex interplay of chemistry and thermodynamics. The primary chemical reaction at its core is the combustion reaction. 

Chemical and Process Considerations:

• Fuel-to-Oxygen Ratio: The stoichiometry of the waste gas and oxygen input must be carefully balanced to facilitate complete combustion and minimize the production of harmful by-products like carbon monoxide and nitrogen oxides (NOx).
• Flame Stability: Ensuring flame stability is crucial since it influences the burners' efficiency and safety. Flame stabilization requires understanding the waste gas composition, which can vary and often includes inert gases.
• Ignition Temperature: Engineers must maintain temperatures above the ignition point of the waste gas, ensuring that the heater operates in a safe envelope and preventing flameouts.

Mechanical Design of Fired Heaters for Waste Gas

The mechanical design of fired heaters is pivotal for effectively using waste gas as a fuel source. This involves aspects such as burner design, heat exchanger configuration, fuel delivery systems, and stack design.

Key Mechanical Elements:

• Burner Types
• Heat Recovery Systems
• Flue Gas Handling

Best Practices for Optimizing Performance

For engineers looking to optimize the burning of waste gas in fired heaters, several best practices can improve performance and safety, all while adhering to environmental norms.

Optimization Techniques:

• Regular Maintenance
• Advanced Controls
• Training and Safety Protocols

Diving Deeper 

Leveraging waste gas as a fuel in fired heaters is a testament to engineering innovation and commitment to sustainability. Doyle Bishop takes a deep dive into how Tulsa Heaters Midstream leverages its technology to meet this request of its customers.