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Annike cone column rotary cutting top burning hot blast stove ultra-low emission-the third party authoritative test report is here!

Time:

2023-04-22

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In September 2020, China proposed to the world 2030 "carbon peak" and 2060 "carbon neutral" target. For the steel industry, it is no longer simply a requirement for quality and output, but also to meet the requirements of energy saving, carbon reduction and environmental protection.

In September 2022, the ironmaking branch of China metal society organized relevant experts to hold a seminar on energy saving and emission reduction technology of hot blast stove in Beijing. The meeting stressed that in the process of developing energy saving technology of hot blast stove, we should pay attention to the low pollution and low emission technology of hot blast stove. Zhengzhou Annike participated as an invited unit and made a report entitled "Energy Saving and Environmental Protection Technology for Top Burning Hot Blast Stove". The report made a detailed analysis of the energy saving and emission reduction approaches and potential of hot blast stoves, and focused on the technical application and ultra-low emission cases of cone column rotary cutting hot blast stoves jointly developed by Annike and MCC Jingcheng.

A blast furnace in a steel enterprise in Shanxi is equipped with 3 cone-column rotary-cutting top-burning hot stoves, which have been put into operation in 2022 for more than a year. Recently, a third-party monitoring agency conducted an online test on the flue gas emission composition index of the hot blast stove system and issued a CMA test report.

Figure 1 | On-site flue gas detection

Figure 2 | Real-time detection data of flue gas composition on site

The test report shows that the vault temperature of the hot blast stove is 1302-1323 ℃, the air supply temperature is 1213-1228 ℃, and the average NOx content in the flue gas is less than 30mg/nm, which is more than 80% lower than the 150mg/nm of the national ultra-low emission standard, creating considerable economic and social benefits for customers.

One of the hot blast stoves in the blast furnace of an iron and steel enterprise in Hebei adopts the design of Kalujin-like hot blast stove. CO emissions are more than 3000mg/nm all the year round, exceeding the local emission standard limit of 500mg/nm. Normal production cannot be carried out under the control of environmental protection policies, which brings great environmental pressure to the enterprise and has to stop production. After receiving the notice from the owner, Anneke arrived at the site to conduct a detailed investigation on the design and operation of all blast furnaces for 3 days, fully understood the various design and operation parameters of different blast furnaces, and conducted a mathematical model study on the combustion status of hot blast furnaces under different operating systems, and found that there were different degrees of defects in the design of hot blast stove burners. In view of the problems existing in the burner design, Anneke formulated the transformation plan of the cooling furnace, maintenance and drying furnace of the hot blast furnace, and completed the transformation of the hot blast furnace burner in 35 days (15 days for each of the cooling furnace and drying furnace) under the condition of extremely limited transformation conditions. The CO content in flue gas of the modified burner under different operating systems is lower than 350 mg/m, which is 88% lower than that before the modification. A few days ago, we are discussing with the owner the CO renovation project of several other blast furnace hot blast stove flue gas, and strive to reduce the CO emission in the flue gas of each blast furnace hot blast stove by more than 85%.

Since its inception, Anneke cone column rotary cutting top-fired hot blast stove has successively achieved remarkable economic and social benefits in nearly 3000 hot blast stoves, which is especially suitable for the application of new construction or renovation projects of global blast furnaces. Anneke will continue to devote itself to the technological innovation of top-burning hot blast stove and the research and development and production of supporting refractory materials. Through continuous optimization and upgrading of the furnace structure and refractory material configuration, Anneke will realize ultra-low emission or even zero emission of pollutants in exhaust gas, comprehensively promote the energy-saving, low-carbon and green development of hot blast stove, and help the smooth realization of the national double-carbon target.

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