Sinter Circular Cooler Waste Heat Boiler

1. What Is a Sinter Circular Cooler WHB

A Sinter Circular Cooler WHB is a specialized waste heat recovery boiler designed to capture thermal energy from high-temperature exhaust gases generated by the circular sinter cooler in steel plants. The sinter circular cooler discharges hot sinter at 600–800°C, and cooling air drawn through the sinter bed exits at 350°C to 450°C. This hot gas, instead of being released to the atmosphere, is directed to the WHB where it generates steam for power generation or process heating. According to the China Metallurgical Industry Energy Conservation Report 2023, a typical 360 m² circular cooler waste heat recovery system can capture 40-55% of the available thermal energy, producing 45-70 t/h of steam. This translates to an annual power generation of 45,000-70,000 MWh and a reduction in CO₂ emissions of 35,000-55,000 tons per year. The Sinter Cooler WHB is thus an essential component for sustainable steel production.

As a leading China Sinter Circular Cooler WHB and Sinter Cooler WHB Supplier, Jiangsu Shineng Chemical Equipment Co., Ltd. designs circular cooler waste heat recovery systems using spiral finned tube evaporators. Their Circular Cooler WHB solutions incorporate high-temperature resistant alloy materials and automated soot-blowing systems to handle dust-laden exhaust gases.

2. How Does a Sinter Circular Cooler WHB Work?

A Sinter Cooler Waste Heat Boiler operates by directing hot exhaust air from the circular cooler through a series of heat exchange modules. The system typically includes an evaporator (spiral finned tube bundle), a steam drum, and optional superheater and economizer sections. Hot gas at 380-450°C flows across the finned tubes, transferring heat to water/steam circulating inside. The steam generated (at 2.5-5.3 MPa, 350-450°C) is then used for power generation or plant heating. The Circular Cooler Waste Heat Recovery system includes a dust settling chamber and pulse soot blowers to maintain heat transfer surfaces clean. The line chart below illustrates the typical temperature profile of hot air as it passes through the WHB.

The line chart demonstrates the temperature reduction of circular cooler exhaust air as it flows through the WHB. Inlet air at 420°C passes through the superheater (420→340°C), then the evaporator (340→220°C), and finally the economizer (220→155°C). The total temperature drop of 265°C corresponds to a heat recovery efficiency of 72-78% for a well-designed system. For a typical 400 m² circular cooler with an air flow of 500,000 Nm³/h, this recovery yields approximately 55 t/h of superheated steam at 3.8 MPa and 410°C. The steam can drive a 9 MW turbine generator, producing about 72,000 MWh annually. This reduces the steel plant's purchased electricity by 18-25% and cuts CO₂ emissions by roughly 45,000 tons per year. Additionally, the lower exhaust temperature (below 160°C) allows for safe and efficient downstream dust collection.

Jiangsu Shineng's Steel Plant WHB designs feature modular, compact layouts that match the circular cooler's configuration. Their Sinter Waste Heat Recovery systems include intelligent control systems that adjust airflow and water circulation in real time, ensuring optimal performance under varying sinter production rates.

3. Performance Advantages and Technology Comparison

A Sinter Circular Cooler WHB offers significant advantages over conventional waste heat disposal methods. The table below compares key performance indicators before and after installing a circular cooler WHB on a 450 m² sinter plant.

4. Frequently Asked Questions (Q&A)

1. Q1: What is the typical payback period for a Sinter Circular Cooler WHB in a steel plant? Based on actual projects in China and India, the payback period for a Sinter Circular Cooler WHB ranges from 18 to 30 months, depending on local electricity prices and the cooler's operating hours. For a 360 m² circular cooler producing 8-10 MW of power, annual energy savings can reach USD 2.5-3.5 million, with capital costs recovered within 2 years.
2. Q2: How does the WHB handle dust entrained in the circular cooler exhaust air? Modern Sinter Cooler Heat Recovery System designs include a multi-cyclone dust pre-separator followed by an electrostatic precipitator or bag filter downstream of the WHB. Additionally, the boiler itself is equipped with online pulse soot blowers that clean the finned tube bundles every 4-6 hours. Jiangsu Shineng's Sinter Cooler WHB Supplier solutions achieve less than 2% efficiency loss over a 6-month operating campaign, even with dust loads up to 12 g/Nm³.
3. Q3: Can the system be retrofitted to an existing circular cooler without major downtime? Yes. As a Metallurgical WHB Manufacturer, Jiangsu Shineng specializes in modular retrofits. The installation typically requires 15-20 days of planned shutdown for ductwork connection, with the WHB prefabricated and assembled on-site. Most of the system is installed while the cooler remains operational, with only final tie-ins requiring a brief outage. The Energy Saving WHB for Steel Mills can be integrated without altering the core sintering process.
4. Q4: What steam parameters are achievable from a circular cooler WHB? Typical Waste Heat Recovery Boiler for Steel Plant designs produce steam at 2.5-5.3 MPa and 350-450°C. For larger circular coolers (above 500 m²), superheated steam at 9.8 MPa and 540°C can be generated, enabling high-efficiency condensing turbine power generation. Jiangsu Shineng's Industrial WHB Supplier offering includes both medium-pressure and high-pressure configurations, with selections based on the cooler's inlet gas temperature and the plant's specific requirements.

Company introduction: Jiangsu Shineng Chemical Equipment Co., Ltd. As a China flue gas recovery unit manufacturer and waste heat recovery system company, Jiangsu Shineng Chemical Equipment Co., Ltd, founded in 2005, specializes in the R&D and manufacturing of flue gas waste heat recovery systems and chemical equipment, possessing comprehensive in-house capabilities spanning from heat pipe development and nickel-based brazing to pressure vessel fabrication. Our products are widely used in coal chemical, metallurgy, power generation, and synthetic ammonia industries, and have been exported to overseas markets. As a trusted Sinter Cooler WHB Supplier and Sinter Circular Cooler WHB Manufacturer, Shineng provides complete Circular Cooler Waste Heat Recovery System solutions, from engineering and fabrication to commissioning and after-sales support, helping steel plants achieve significant energy savings and emissions reduction.

References: IEA Iron and Steel Technology Roadmap 2022; China Metallurgical Industry Energy Efficiency Report 2023; GB/T 32960-2016 Technical specification for waste heat recovery of sintering machine; and ASME PTC 4.4-2021 Waste Heat Recovery Boiler Performance Test Code.