With the unprecedented development of the international steel market, the demand for blast furnace raw materials is developing rapidly. In addition to the substantial increase in demand for sintering raw materials, the demand for pellet raw materials and pellets also increased significantly with the development of blast furnace burden structure. The proportion of pelletized ore output is also increasing in the total output, and the further increase of the international market demand for pelletized ore has also promoted the scale of pelletized ore production to shift to large-scale.
Since 1954 that NHI manufactured 18 square meters sintering machine, till now NHI has been designing and manufacturing complete equipment of sintering pellet for over 60 years. In the 1990s, NHI and Hitachi Zosen, Japan, jointly designed and manufactured two 450 square meter sintering machines and accessories for Shanghai Baosteel Group. Since then, on the basis of absorbing the advanced technology, we have continuously provided sintering pellet equipment for major domestic steel groups and established our leading position in this field.
2.Composition of complete equipment
According to the sintering production process, our company mainly produces the mixer, sintering machine, single tooth roller crusher, sintering annular cooler and auxiliary equipment. According to the pellet production process, our company mainly produces dryer, moistening mill, pelletizing plate, travelling grate, rotary kiln, pellet annular cooler and auxiliary equipment.
3.Technical features and advantages
NHI can design and manufacture a complete set of equipment with advanced level of over 600m2 sintering line and annual output of 5 million tons pellet line. In 2013, NHI cooperated with Khorasan, Iran, for an annual output of 2.5 million tons of pellets project, becoming the first domestic manufacturer with EPC performance of belt pelletizing production line and independent design and manufacturing capacity of belt sintering complete equipment. In 1976 and 1991, NHI provided Baotou Iron and steel and Anshan Iron and steel with 1.2 million T/A and 2 million T/A oxidized pellet plants respectively. Among the about 70 pelletizing plants operating in China, 35 of them adopt NHI products such as grate, rotary kiln and annular cooler. The annular cooler for the 5 million tons / year pelletizing plant in China is manufactured by NHI.
In terms of the manufacturing of the main equipment of the pelletizing, NHI has the design and manufacturing capacity of the large sintering machines.The 660 square meters sintering machine manufactured by our company for Taiyuan Iron and steel is running well. At the same time, our company is also the first professional manufacturer with the ability of designs and manufactures rotary equipment in China. It is a designated manufacturer of rotary kiln of the Former Ministry of Machinery. At present, the design and manufacturing specifications of rotary kiln are from Φ2.5 to Φ8.2m, the length is from 15m to 165m, and the specifications of annular cooler are from 35m2 to the largest 248m2 in China.