1. Furnace top design
① The shape of the refractory brick furnace top is conical, and the angle between the arch and the horizontal brick is designed to be 10 °. For safety reasons, a 15 ° angle is used.
② The thickness of the furnace top still adopts a refractory brick thickness of 230mm.
③ The ring beams and arches are not reinforced, and the ring beams are poured in nine sections. Expansion joints between each section are filled with 6mm asbestos boards.
④ The arch is composed of 12 fan-shaped surfaces, with 3mm asbestos board filled between the 12 joints. To reduce the excessive thrust of the arch on the ring beam due to high temperature, 6mm asbestos board is filled between the two to provide cushioning.
⑤ There is no asbestos board pasted around the arch ring beam, and the 120mm well platform at the top outlet is poured separately.
⑥ Due to the change in the angle between the cone and the top, in order to ensure the insulation effect at the top, a 10 # channel steel is used as a lifting ring for the top cover, raising it by 100mm.
2. Improvement plan for the construction of boiling layer furnace lining
The construction of the boiling layer furnace used to use refractory brick lining in the past. Due to the complex structure of the boiling layer and multiple opening positions, the refractory lining needs to be overhauled every year when the furnace is shut down. There are more openings in the 6.6 ㎡ boiling furnace, with a total of 10 locations including 6 water tanks, feed ports, overflow ports, manholes, and ignition holes. To enhance the overall integrity, it has been decided to use casting material for overall pouring at the top of all openings, and to use overall pouring in weaker areas such as the junction between the overflow port and the left and right water tanks, and the junction between the furnace door and the left and right water tanks.
Before opening the furnace, strict oven maintenance work should be carried out to discharge free water and chemical crystallization water from the casting material, and to avoid sudden temperature changes during ignition and heating process that may cause explosions. When drying the oven, control the heating rate between 25-50 ℃/h, strictly control the constant temperature stage during the heating process, and avoid uneven distribution of oven temperature.
Contact me:
Email:wp@cnjingganrefractory.com/sdwenping@163.com
TEL: 86-0533-4188518 / FAX: 86-0533-4188518
Rose:+86-13275332819(wechat/whatsapp number)
