1. Large Muffleless Belt H2 Reduction Furnace
The heat-resistant steel mesh belt drive and the synchronous self-rotating roller drive are combined to form a coupled drive, and combined with the muffle-free H2 reduction furnace body to implement wide-band surface, long-distance, and large-load transmission. At present, the production capacity of a single reduction furnace can reach 10,000 - 30,000 t/year (later goal: taking the furnace width of 10m × length of 300m as an example, the production capacity of a single unit can reach more than 500,000-800,000 t/year). Since the mesh belt mainly bears the bearing material during the movement, its high-temperature service life can reach 1-2 years, which greatly reduces the operating cost; due to the use of electricity or natural gas heating and muffle-free reduction furnace and hydrogen reduction, the emission of carbon dioxide is reduced, and the Highly automated and very environmentally friendly large H2 reduction furnace.
2. Technical Features
●Muffle-free reduction furnace body is composed of preheating section + N group reduction section + cooling section;
●Reduction temperature: 900‑1200℃; H2/CO coupling reduction gas pressure 100-500Pa;
●Due to the use of mesh belt drive system and synchronous self-rotating roller coupling transmission, high temperature, wide surface, long distance, large load transmission can be implemented, and its unit area can be loaded up to 50-80kg/m2;
● Since the mesh belt mainly bears the bearing material during the movement, its high temperature service life can reach 1-2 years, which greatly reduces the operating cost;
●Taking the furnace width of 2.5m × length of 70-150m as an example, the production capacity of a single unit can reach 20,000-30,000 t/year;
●Due to the use of electricity or natural gas heating, muffle-free reduction furnace and hydrogen reduction, carbon dioxide emissions are reduced, and it is a large-scale H2 reduction furnace with high automation and environmental protection.
3. Raw Fuel Conditions
●Natural Gas: according to the furnace type
●Binder: Special for Ore Powder(with catalytic reduction function) ; Annual Demand: Calculated according to 2-5% of mineral powder.
●Internally Prepared Reducing Agent: C≥85.0%, the annual demand is calculated as 20-30% of the mineral powder. (Can produce material charcoal, etc.)
4. Process Flow
The iron oxide pellets are evenly distributed on the heat-resistant steel mesh belt, and are coupled and driven by the mesh belt transmission system and the synchronous self-rotating roller, and enter the muffle-free reduction furnace body (preheating section + N group reduction section + cooling section) to complete the reduction process. , reduction temperature: 900-1200℃; due to the use of mesh belt transmission system and synchronous self-rotating roller coupling transmission, high temperature, wide-band surface, long-distance, large-load transmission can be implemented, and its unit area can be loaded up to 50-80kg/m2. The mesh belt is mainly responsible for bearing materials during movement, and its high-temperature service life can reach 1-2 years, which greatly reduces operating costs; due to the use of electricity and natural gas heating, muffle-free reduction furnace and hydrogen reduction system, carbon dioxide emissions are reduced. Highly automated and very environmentally friendly large H2 reduction furnace.
5. Workshop Composition
The direct reduction workshop is mainly composed of the following systems:
（1）Raw Material System
The raw material system is mainly to compress the iron fine powder into the reduction furnace for reduction after drying, aiming to provide qualified charge for the reduction furnace. The process is as follows: iron powder with appropriate water content, binder and catalytic reducing agent are weighed separately under the warehouse, and after weighing, enter the powerful mixer system to add water for mixing, and then send it to the high-pressure briquetting machine through the belt. After pressing, the green pellets are sent to the dryer for drying through the belt conveyor, and the dried finished pellets are transported to the finished pellet warehouse by the belt.
（2）Reduction Furnace System
This large muffless belt TYPE H2 reducing furnace is composed of muffless reducing furnace, steel mesh belt driving system and several synchronous self-driving rollers. Muffless reducing furnace is successively divided into preheating section +N group reduction section + cooling section. The N group reduction section is the main body of the furnace. Two mesh belt driving wheels and two tensioning wheels of the steel mesh belt driving system are respectively installed outside the muffless reducing furnace. A number of synchronous self-rotating rollers are uniformly installed on the furnace body of muffle reduction furnace. The preheating section and cooling section are respectively connected to the front and back ends of the furnace body with flanges. The front end of the preheating section is provided with furnace gas discharge pipe, N2 inlet pipe and valve.
The cooling section is provided with N2 intake pipes and valves, and an N2 air-tight curtain is set at the end of the cooling section; each group of reduction sections is provided with several heating radiant tubes, H2 intake pipes and valves, and the steel mesh belt is sleeved on the two mesh belt drive wheels and On the two tensioning pulleys, and the steel mesh belt passes through the interior of the muffleless reduction furnace, it is located on all the synchronous self-rotating rollers and is in close contact with the synchronous self-rotating rollers.
Process advantages: reduction temperature: 900-1200 ℃, conversion of natural gas + N2 gas into reducing gas (pressure: 100-500pa positive pressure), and H2/CO coupling reduction with pellets containing catalytic reducing agent at high temperature to achieve rapid The reduction effect, the metallization rate of sponge iron can reach about 90-98% by adjusting the amount of catalytic reducing agent, the reduction temperature and the speed of the mesh belt.
（3）Outlet System
DRI pellets are directly sent to the silo in the steelmaking workshop through the conveying device for steelmaking use, or (optional) briquetting by the briquetting device and transported to the finished product storage place for storage.
Post time: Aug-15-2022