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Improvement of blast furnace straight pipe
The flue gas waste gas preheating system for the blast furnace gas was upgraded during a scheduled maintenance period. The original heat pipe heat exchanger, which provided double preheating for both gas and air, was replaced. Instead of moving the flue gas heat exchanger, the existing air and gas heat exchangers were removed and their heat exchange tubes were relocated into a new tank. This approach made full use of the existing supports, platforms, and external piping, reducing installation time and costs.
At the same time, the company implemented a strict accountability system that ensured every team member was responsible for their role in the project. This system helped maintain discipline and efficiency, aligning with the rigorous standards expected in state-owned enterprises. By focusing on increasing production while reducing energy consumption, the company aimed to drive technological innovation and improve its competitive edge. These efforts supported long-term sustainability, stability, and healthy business growth.
A side-by-side adjustment system for maintaining the correct air-fuel ratio was also introduced. During combustion, the amount of air was automatically adjusted based on the gas flow, ensuring an optimal air-fuel ratio. This allowed the furnace top temperature to reach the desired level quickly and remain stable, which helped increase the heat storage capacity of the regenerator. When the exhaust gas temperature reached the required threshold, the hot blast stove was ready for switching. An exhaust gas analysis system served as a feedback mechanism, allowing real-time adjustments to the air-fuel ratio for improved performance.
To address issues caused by rising wind temperatures, the blast furnace's straight pipe was upgraded. The original air supply device could no longer withstand the higher temperatures, leading to red-hot and damaged pipes. The straight pipe and its castable materials were replaced, and some sections of the pipe and expansion joints were updated. These improvements effectively resolved the problem.
Through these hot blast stove upgrades and other operational enhancements, the wind temperature gradually increased, and key technical and economic indicators saw significant improvement. The overall performance of the facility became more efficient and reliable, supporting the company’s long-term goals of sustainable development.