1. What Is a Final Gas Cooler?

The Final Gas Cooler is part of the primary gas cooling system, typically installed after the first-stage cooler. While the first-stage cooler reduces the raw gas temperature from around 700–800°C to approximately 150°C, the final gas cooler further reduces the temperature to 80–100°C, preparing the gas for stable downstream purification.

The horizontal tube-type design makes this cooler compact, easy to maintain, and highly efficient.

2. Working Principle

1. Raw Gas Flow
   Semi-cooled gas from the first-stage cooler enters the shell side of the heat exchanger and flows across the horizontal tube bundle.

2. Cooling Water Circulation
   Cold water circulates through the inside of the tubes, absorbing heat from the gas via indirect heat exchange.

3. Heat Transfer and Tar Condensation
   As the gas cools further, more tar and water vapor condense, enhancing tar recovery and improving gas purity.

4. Discharge
   The cooled gas exits the cooler and continues to purification units such as tar precipitators or chemical absorption systems.

3. Equipment Structure

• Shell-and-Tube Configuration: A classic and proven design

• Horizontal Layout: Suitable for ground-level installation with low height requirements

• Tube Bundles: Made of carbon steel or stainless steel, selected based on the corrosion level of the gas

• Removable Tube Sheets: Allow easy inspection and cleaning

• Drainage Ports: Enable discharge of condensate (tar and water mixture)

4. Key Features & Benefits

5. Typical Technical Specifications

6. Application Scenarios

• Coke oven gas final cooling section

• Gas treatment systems in coal chemical plants

• Retrofit of aging COG cooling lines

• Projects requiring stable gas outlet temperature control

• Systems aiming to improve tar recovery and dust removal efficiency

7. Why Choose a Horizontal Tube-Type Final Cooler?

• Proven and reliable in long-term operation

• Lower pressure drop compared to tower-type solutions

• Suitable for highly polluted or sticky gas

• Compatible with both continuous and batch operations

• Efficient separation of condensates

8. Conclusion

The Horizontal Tube-Type Final Gas Cooler is a critical component in modern coke oven gas cooling systems. It ensures that raw gas is conditioned to the correct temperature for downstream processing, contributing to improved efficiency, environmental performance, and tar recovery.

Whether you are designing a new plant or upgrading an existing system, we offer customized design, fabrication, and technical support to meet your specific needs.

Contact Booyo engineering team today to learn more about how our solutions can enhance your gas treatment process.