Basic knowledge of pellet shaft furnace

The top pneumatic distributor has a simple structure and reliable operation.

The upper and lower layers of drying bed have a large drying area, and the gas temperature can be controlled in different zones, which can achieve variable temperature and slow drying, reducing excessive humidity and cracking phenomena.

The drying bed has the functions of air screen and fixed screen, which can separate most of the powder and return ore in advance and discharge them outside the furnace, improving the permeability and airflow distribution of the roasting belt column, enhancing the adaptability to raw materials and operational fluctuations, and making the utilization coefficient of the TCS pellet vertical furnace reach as high as 7-8.33 (t/㎡ · h).

The fire spout and combustion chamber of the baking belt are placed inside the furnace, burning from the inside out, making full use of the edge effect, improving the air flow and temperature in the low-temperature area near the external wall opposite the fire spout, and making the air flow and temperature distribution of the entire baking belt become uniform and reasonable.

The characteristics of circular baking strips. It is convenient to design a larger baking zone area without increasing the width of the baking zone, which is conducive to the large-scale production of the shaft furnace.

The combustion chamber, roasting zone, drying zone, and anti moisture zone can be independently monitored and controlled by computers in different zones, greatly improving operational accuracy. Through debugging and operation, various parameters can be optimized

The circular air guide wall is placed on the outer side of the baking zone wall, with high structural strength and not easily blocked.

The cooling capacity inside the furnace is large, and the average ball outlet temperature can be reduced to below 300 ℃, which not only improves energy utilization rate, but also eliminates the additional investment and environmental issues caused by configuring a large cooling machine outside the furnace, making it easier to meet environmental standards.

The annular discharge truck with variable frequency control on the furnace top has been improved, and the power supply system has a temperature resistance of over 400 ℃. Its structure is simple and reliable, and it can achieve stepless adjustment and good coordination with the fabric.

The effective height of the roasting belt of the TCS pellet shaft furnace is greater than that of the rectangular SP pellet shaft furnace. However, due to the use of a self standing structure, its total height is reduced, which can save belt length and total floor area.

The TCS pellet shaft furnace recovers the waste heat from the drying system to preheat the combustion air, resulting in an average temperature of 230-280 ℃ and a combustion chamber pressure of only 6-8kPa. (The energy-saving shaft furnace can achieve a combustion air temperature of over 600 ℃ and a combustion chamber pressure of only 12-15kPa), thus reducing electricity and gas consumption. Under normal production conditions, the blast furnace gas consumption has decreased to 170-220 cubic meters/ton of ball. In addition, the TCS pellet shaft furnace has a simple structure, Low maintenance costs.

Due to the above comprehensive reasons, compared with the rectangular SP pellet shaft furnace of the same scale, the TCS pellet shaft furnace saves one-third of investment and land, has low energy consumption, low operating and maintenance costs, and a processing cost of 10 yuan/ton of finished pellets.

TCS acid oxidation pellet vertical furnace solves the problem of refined materials and reasonable burden structure in blast furnace ironmaking plants with low investment. It is a low investment and high efficiency project for the technological transformation of steel enterprises and the deep processing of iron concentrate powder in iron mine beneficiation plants. Large modern TCS circular pellet vertical furnace can significantly improve the incoming grade and concentrate level of ironmaking blast furnaces, laying a good foundation for increasing furnace top pressure, enriching oxygen and injecting coal, reducing pig iron costs, improving the production and quality of ironmaking blast furnaces, thereby greatly improving the efficiency of steelmaking and continuous casting machines, reducing steel material consumption and costs, and extending the lifespan of blast furnaces and converters, It is a short-term and rapid technological transformation project for steel enterprises to tap into potential and increase efficiency. It has the characteristics of large scale, high quality, low cost, small land occupation, low investment, low energy consumption, high efficiency, short construction period, and fast effectiveness. Replacing low-quality pellets and raw ore with high-quality shaft furnace pellets and using them in conjunction with high alkalinity sintered ore is the foundation of refined materials. Due to the high grade of TCS shaft furnace pellets ranging from 63% to 65% and FeO lower than 2%, especially the high temperature metallurgical properties such as reduction and pulverization rate, which are greatly superior to imported rich ore blocks and low-quality pellets, the economic benefits of the entire steel enterprise will be greatly improved. All steel enterprises with good economic benefits are following the path of refined materials.