Sintering Waste Heat Boiler on Main Flue Gas Duct

1. What Is a Sintering Waste Heat Boiler

A Sintering Waste Heat Boiler is a specialized waste heat recovery boiler designed to capture thermal energy from hot flue gases generated during the iron ore sintering process in steel plants. In a typical sintering machine, the sinter bed produces exhaust gases at 300°C to 450°C, while the sinter cooler (hot sinter discharge) releases air at 350°C to 550°C. A Sintering WHB recovers both heat sources to produce superheated steam for power generation or process use. According to the China Metallurgical Industry Energy Efficiency Report 2023, sintering accounts for about 10-15% of a steel plant's total energy consumption, and waste heat recovery can capture 35-50% of the available thermal energy. For a 360 m² sintering machine, this translates to steam production of 60-90 t/h, generating 8-12 MW of electricity. The recovered energy significantly reduces the plant's carbon footprint and operating costs.

As a specialized China Sintering Waste Heat Boiler and Sintering Machine WHB Manufacturer, Jiangsu Shineng Chemical Equipment Co., Ltd. designs and supplies complete waste heat recovery systems for steel plants. Their Steel Plant WHB solutions incorporate finned tube heat exchangers, dust removal systems, and anti-corrosion designs for high-sulfur sintering flue gas.

2. How Does a Sintering Waste Heat Boiler Work?

A Sintering Waste Heat Recovery Boiler typically consists of two independent heat recovery sections: one for the sinter cooler (hot air from the sinter discharge) and one for the sintering machine exhaust gas. Hot gases at 350–550°C enter the boiler and flow across finned tube bundles, transferring heat to water/steam. The system includes an economizer, evaporator, superheater, and steam drum. A forced circulation or natural circulation design is selected based on gas temperature and pressure requirements. The Sinter Cooler WHB often uses a separate circuit to avoid cross-contamination with the strand gas.

Jiangsu Shineng's Metallurgical Waste Heat Boiler designs incorporate self-cleaning finned tubes and pulse soot-blowing systems to handle high dust loads (up to 15 g/Nm³). Their Sintering Waste Heat Recovery System has been successfully installed in multiple 300-500 m² sinter plants across Asia, achieving over 95% operational availability.

3. Performance Advantages and Technology Comparison

A Sintering Waste Heat Boiler provides multiple benefits: reduced fuel consumption, lower CO₂ emissions, and improved plant profitability. The table below compares key performance indicators for a steel plant before and after installing a WHB on its 450 m² sintering line.

4. Frequently Asked Questions (Q&A)

1. Q1: What is the typical payback period for a sintering waste heat boiler in a steel plant? Based on multiple projects in China and Southeast Asia, the payback period for a Sintering Waste Heat Recovery System ranges from 1.5 to 3 years, depending on local electricity prices and operating hours. For a 360 m² sinter machine producing 8 MW of power, annual savings can exceed USD 3 million, with capital costs recovered within 24 months.
2. Q2: Can a sintering WHB handle the high dust content of sinter flue gas without frequent cleaning? Yes. Modern Sinter Cooler WHB designs incorporate low-resistance finned tubes with wide pitch (12-20 mm) and online pulse soot-blowing systems. Jiangsu Shineng's units operate at dust loads up to 18 g/Nm³ with cleaning intervals of 6-8 hours, achieving 96% thermal performance retention over a 6-month campaign. For heavy fouling, offline water washing during scheduled maintenance restores full capacity.
3. Q3: What steam parameters are typically achieved in a sintering waste heat boiler? Most Industrial WHB Manufacturer designs for sintering produce superheated steam at 3.8-5.3 MPa and 400-450°C. Larger systems (500 m² and above) can achieve 9.8 MPa, 540°C for high-efficiency power generation. The choice depends on the gas inlet temperature (higher temperature allows higher pressure) and downstream turbine requirements. Jiangsu Shineng offers both medium-pressure and high-pressure designs as a Custom Sintering WHB provider.
4. Q4: How does a sintering WHB compare to a conventional boiler in terms of efficiency? A Sintering Waste Heat Boiler operates on "free" waste heat and typically achieves 78-84% heat recovery efficiency from the flue gas stream, whereas a conventional fuel-fired boiler has 88-92% efficiency but consumes fuel. The net primary energy saving is substantial: every 1 MW of power from a WHB avoids 2.5-3.0 MW of fuel input in a separate boiler. This makes Waste Heat Recovery Boiler for Steel Plant one of the most effective decarbonization technologies available.

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 leading Sintering Waste Heat Boiler Supplier and Sintering Machine WHB Manufacturer, Shineng provides complete Energy Saving WHB for Steel Industry solutions, from design and fabrication to commissioning and after-sales support.

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.