Bell Furnace

Low maintenance and operating costs.

Bogie hearth furnaces have complex structures including furnace doors and lifting mechanisms, furnace cars and drive mechanisms, and sealing and drive components, resulting in a large workload for daily maintenance. In contrast, bell-type furnaces have virtually no transmission mechanisms and simpler sealing structures, leading to less maintenance and repair work and lower maintenance costs.

Short construction period and low total cost.

Bell-type furnaces have a simple overall structure with fewer purchased and machined parts, making manufacturing and construction simple, with a short cycle, low cost, and quick commissioning.

High efficiency and energy saving.

The bell-type furnace hood is movable, and in suitable locations, two furnaces can be built under one hood. Therefore, bell-type furnaces offer high output, high efficiency, and low energy consumption. Compared to bogie hearth furnaces, bell-type furnaces have better airtightness, essentially cutting off airflow exchange between the inside and outside of the furnace. For the same specifications, bell-type furnaces have less heat loss than bogie hearth furnaces, making them more energy-efficient.

"Regarding the challenges of efficiency and uniformity in heat treatment of large workpieces, there are already mature solutions available in practical engineering. For example, the 90㎡ bell-type heat treatment furnace I designed and constructed for our client achieved both improved furnace temperature uniformity and reduced heat loss through a combination of technologies including lightweight fiber lining, self-preheating burners, and triple soft and hard sealing.

Please continue reading to see how we solved this problem."

Due to the large furnace loading capacity and heavy load, the foundation was constructed using a monolithic cast-in-place reinforced concrete structure. The excavation depth was 1856mm, above the groundwater level. During excavation, some areas with scattered sections of the original refining furnace foundation, approximately 3000mm deep, were discovered. During construction, after leveling the original soil layer with pneumatic picks, a layer of crushed stone and slag was added to eliminate any potential fulcrum reaction from the old foundation. The foundation consists of layers from the original soil layer to the furnace bottom.

Therefore, the refractory lining of the furnace bottom and furnace platform is a composite brick layer to increase its strength.

The furnace bottom is formed by laying 204mm clay bricks on top of 136mm lightweight clay bricks as insulation. To meet the needs of the combustion system, six rows of combustion channels (696mm × 680mm × 10208mm) are built above the clay brick layer, with adjustable cover plates forming the lower heating channel area. During production, shims and workpieces are placed on top of this.

Since the furnace platform serves the dual purpose of fixing the furnace body and bearing the load of the furnace hood, its structural and strength design is particularly important. The furnace platform steel structure includes: furnace steel structural columns fixed to the foundation, furnace shell steel plates, burner fixing structure, sand sealing groove, and furnace platform sealing plate, etc., with a total steel weight of 22t. Its refractory lining consists of: 50mm fiber felt + a layer of lightweight bricks laid vertically + 348mm clay bricks.

Because the refractory lining of the furnace bottom and furnace platform is subject to strict requirements on strength and flatness, the saturation of the mortar, the thickness of the brick joints and the pass rate of the expansion joint width are strictly assessed during the masonry process to ensure that they meet the requirements of the drawings and GB200-1987 standard.

Production practice has proven that the thermal insulation effect and load-bearing strength are both excellent.

We are one of the most professional bell furnace manufacturers and suppliers in China. With abundant experience, we warmly welcome you to buy high quality bell furnace made in China here from our factory. Thank you for your interest in our products.