Description
Key words: iron ore ball dryer, iron concentrate pellet dryer, iron concentrate pellet dryer, iron ball drying equipment, rotary drum dryer
Classification: slime engineering industry
Case overview: pellet dryer, also known as iron concentrate pellet dryer. The equipment is mainly used for drying iron concentrate pellets, slag produced by molten rock after rapid water quenching in iron and steel works, as well as carbide slag, limestone, clay, river sand, quartz sand, water slag and other large proportion materials, which is widely used in building materials, chemical industry, casting and other industries.
Why is the pellet dried?
If the green ball is not dry and enters the preheating zone with a large amount of water, the water in the ball will evaporate violently, which will split and even burst. However, the raw pellets without sufficient drying are directly roasted in high temperature zone without bursting in time. Due to the high moisture content in the ball and the evaporation absorption of a large amount of heat energy, the pellet can not rise to the specified temperature quickly, which will inevitably prolong the roasting time, reduce the productivity and cause serious fuel consumption. In addition, it is necessary to dry the pellets with magnetite concentrate or ore powder.
In the traditional iron concentrate drying process, the drying furnace is set at the feed end of the rotary drum dryer, and the waste gas pipe is set at the discharge end, so that the material flow and hot flue gas flow in the same direction. The disadvantages of this process are:
1. The average temperature difference between flue gas and iron concentrate is small, the heat exchange efficiency is low, and the energy consumption is large;
2. The size of the equipment is large, the initial investment cost is high, and the operation cost is high;
3. As the feeding chute is set in the high temperature flue gas area, the belt of the feeding belt conveyor and the lining plate of the feeding chute will be damaged by hot air pouring or hot flue gas baking;
4. Due to the cross between the feed chute and the hot air pipe of the drying furnace, the feeding chute will reduce the air supply area of the hot air pipeline of the drying furnace;
5. The high temperature flue gas in the dryer can not be discharged in time when the dryer accident occurs or the furnace is dried in the early stage of production, which makes it very difficult to deal with the drying and production accidents;
6. The forced ventilation process is adopted for the dry waste gas. Due to no effective measures taken at the feed end and the discharge end, the air leakage is serious and the working load of the dust removal fan and dust collector is increased.
Our company introduced advanced technology at home and abroad, combined with the historical experience of iron ore ball drying at home and abroad, developed a new pellet dryer to solve these problems.
Pellet dryer, also known as iron concentrate pellet dryer. The equipment is mainly used for drying iron concentrate pellets, slag produced by molten rock after rapid water quenching in iron and steel works, as well as carbide slag, limestone, clay, river sand, quartz sand, water slag and other large proportion materials, which is widely used in building materials, chemical industry, casting and other industries. In China, the pellet dryer produced by our company is the pellet drying equipment of mechanical industry technology. The materials entering the dryer should not stick to the cylinder wall and the lifting plate. The temperature of the gas entering the dryer for heat exchange should not be higher than 750 ℃. If there are special requirements for high-temperature drying, the inlet inner cylinder and lifting plate of the dryer can be made of heat-resistant plate. This series of pellet dryer is composed of steel structure frame, frying pan, material lifting and guiding device, rolling ring supporting wheel and transmission mechanism.
Iron concentrate pellet dryer:
a drying furnace is set at the discharge end of the rotary drum dryer to make the material flow and hot air flow form a countercurrent movement form; the drying furnace is equipped with a chimney, and an electric valve is set on the chimney; the material outlet of the rotary drum dryer is blocked by the dried iron concentrate through the dragging discharging method; the outlet of the feeding chute is close to the inner wall of the rotary drum dryer, and the cross between the feed chute and the exhaust gas pipeline meets The wind surface adopts streamline design. The advantages of this design are: good heat exchange effect, effectively reduce energy consumption of iron concentrate drying process; reduce the size of drying cylinder and equipment investment; in case of dryer accident or furnace drying in the early stage of production, it can discharge high-temperature flue gas in an emergency to prevent the flue gas from burning the belt of feeding belt conveyor and the lining plate of feeding chute; adopting drag discharge mode, the serious pollution of drying workshop is fundamentally solved Low drying efficiency and high equipment failure rate.
Classification: slime engineering industry
Case overview: pellet dryer, also known as iron concentrate pellet dryer. The equipment is mainly used for drying iron concentrate pellets, slag produced by molten rock after rapid water quenching in iron and steel works, as well as carbide slag, limestone, clay, river sand, quartz sand, water slag and other large proportion materials, which is widely used in building materials, chemical industry, casting and other industries.
Why is the pellet dried?
If the green ball is not dry and enters the preheating zone with a large amount of water, the water in the ball will evaporate violently, which will split and even burst. However, the raw pellets without sufficient drying are directly roasted in high temperature zone without bursting in time. Due to the high moisture content in the ball and the evaporation absorption of a large amount of heat energy, the pellet can not rise to the specified temperature quickly, which will inevitably prolong the roasting time, reduce the productivity and cause serious fuel consumption. In addition, it is necessary to dry the pellets with magnetite concentrate or ore powder.
In the traditional iron concentrate drying process, the drying furnace is set at the feed end of the rotary drum dryer, and the waste gas pipe is set at the discharge end, so that the material flow and hot flue gas flow in the same direction. The disadvantages of this process are:
1. The average temperature difference between flue gas and iron concentrate is small, the heat exchange efficiency is low, and the energy consumption is large;
2. The size of the equipment is large, the initial investment cost is high, and the operation cost is high;
3. As the feeding chute is set in the high temperature flue gas area, the belt of the feeding belt conveyor and the lining plate of the feeding chute will be damaged by hot air pouring or hot flue gas baking;
4. Due to the cross between the feed chute and the hot air pipe of the drying furnace, the feeding chute will reduce the air supply area of the hot air pipeline of the drying furnace;
5. The high temperature flue gas in the dryer can not be discharged in time when the dryer accident occurs or the furnace is dried in the early stage of production, which makes it very difficult to deal with the drying and production accidents;
6. The forced ventilation process is adopted for the dry waste gas. Due to no effective measures taken at the feed end and the discharge end, the air leakage is serious and the working load of the dust removal fan and dust collector is increased.
Our company introduced advanced technology at home and abroad, combined with the historical experience of iron ore ball drying at home and abroad, developed a new pellet dryer to solve these problems.
Pellet dryer, also known as iron concentrate pellet dryer. The equipment is mainly used for drying iron concentrate pellets, slag produced by molten rock after rapid water quenching in iron and steel works, as well as carbide slag, limestone, clay, river sand, quartz sand, water slag and other large proportion materials, which is widely used in building materials, chemical industry, casting and other industries. In China, the pellet dryer produced by our company is the pellet drying equipment of mechanical industry technology. The materials entering the dryer should not stick to the cylinder wall and the lifting plate. The temperature of the gas entering the dryer for heat exchange should not be higher than 750 ℃. If there are special requirements for high-temperature drying, the inlet inner cylinder and lifting plate of the dryer can be made of heat-resistant plate. This series of pellet dryer is composed of steel structure frame, frying pan, material lifting and guiding device, rolling ring supporting wheel and transmission mechanism.
Iron concentrate pellet dryer:
a drying furnace is set at the discharge end of the rotary drum dryer to make the material flow and hot air flow form a countercurrent movement form; the drying furnace is equipped with a chimney, and an electric valve is set on the chimney; the material outlet of the rotary drum dryer is blocked by the dried iron concentrate through the dragging discharging method; the outlet of the feeding chute is close to the inner wall of the rotary drum dryer, and the cross between the feed chute and the exhaust gas pipeline meets The wind surface adopts streamline design. The advantages of this design are: good heat exchange effect, effectively reduce energy consumption of iron concentrate drying process; reduce the size of drying cylinder and equipment investment; in case of dryer accident or furnace drying in the early stage of production, it can discharge high-temperature flue gas in an emergency to prevent the flue gas from burning the belt of feeding belt conveyor and the lining plate of feeding chute; adopting drag discharge mode, the serious pollution of drying workshop is fundamentally solved Low drying efficiency and high equipment failure rate.
The iron concentrate drying equipment for pelletizing comprises a rotary kiln, an exhaust gas pipeline connected with the rotary kiln, a drying furnace, a feeding chute, a feeding belt conveyor arranged on the upper part of the feeding chute, and a discharging belt conveyor arranged below the discharge end of the rotary drum dryer, which is characterized in that the waste gas pipeline is arranged at the feed end of the rotary drum dryer, and the feeding chute is arranged at the feeding end of the rotary drum dryer The drying furnace is arranged at the discharge end of the rotary drum dryer. A hot air pipe is arranged between the discharge end of the rotary drum dryer and the drying furnace. The hot air pipe is fixedly connected with the tail sealing cover of the rotary drum dryer. The top of the rotary kiln is provided with smoke, and the lower part of the smoke is arranged under the smoke There are electric valves in the section.
Drying process of iron concentrate pellet dryer:
1. The wet iron concentrate is fed into the rotary drum dryer by the feeding belt conveyor through the feed chute, and flows to the discharge end of the rotary drum dryer,
2. The drying furnace at the discharge end of the rotary drum dryer sends drying hot air to the rotary drum dryer through hot air pipe, so that the wet iron concentrate material flow and hot air flow form a countercurrent movement form,
3. After heat exchange between dry hot air and wet iron concentrate material flow, it is discharged into rotary drum dryer through waste gas pipeline,
4. The dried iron concentrate flows to the outlet of the rotary drum dryer,
5. Adopting drag discharge mode, that is, the running speed of the discharging belt conveyor is reduced from 1.1-1.3 M / s to 0.7-0.8 M / s, so that the dried iron concentrate at the outlet of the rotary drum dryer is in the stacking state, and the outlet of the rotary drum dryer is in the material sealing state,
6. The iron concentrate discharged slowly from the discharge port to the discharge belt conveyor is evenly dragged out and sent to the next process.
Features of iron concentrate pellet dryer are as follows:
1. A drying furnace is set at the discharge end of the rotary drum dryer to make the material flow and the drying hot air form a countercurrent movement form;
2. Chimney is set on the top of drying furnace, and electric valve is set on the chimney pipe;
3. Drag discharging mode is adopted to block the outlet of dryer through the dried iron concentrate. The discharging belt conveyor slowly and evenly pulls out the iron concentrate, and the dried iron concentrate is continuously added to the outlet;
4. The outlet of the feed chute is as close as possible to the inner wall of the rotary drum dryer to lock the air;
5. The windward side of the intersection of feed chute and exhaust pipe is streamline;
6. Under the condition of treating the same amount of iron concentrate, the average temperature difference of countercurrent is larger than that of downstream flow, and the heat exchange effect is good, which effectively reduces the energy consumption of iron concentrate drying process;
7. Due to the good heat transfer effect, the drying cylinder size of rotary drum dryer can be reduced and the equipment investment can be reduced;
8. The drying furnace is equipped with smoke @, which can discharge high-temperature flue gas in case of an accident of the dryer without damaging the dryer; it can also be used in the drying of the furnace at the initial stage of production, because there is no material passing through the drying cylinder of the rotary drum dryer, The equipment is unable to resist the high temperature flue gas during drying, so the high temperature flue gas is discharged in time through the smoke? So as to protect the dryer from damage;
9. As the feeding chute is close to the low temperature area of flue gas, the flue gas will not burn the belt of the feeding belt conveyor and the lining plate of the feeding chute;
10. The outlet of the feed chute should be close to the inner wall of the rotary drum dryer as far as possible, so that the materials discharged from the chute will seal the outlet of the feeding chute, and the external cold air will not enter the drying cylinder of the rotary drum dryer, thus playing the role of air lock;
11. Increase the effective area of hot air pipe of drying furnace, the resistance of hot air is small and the flow rate is large;
12. The way of dragging discharging is to block the outlet of the dryer through the dried iron concentrate, and the discharging belt conveyor slowly and evenly pulls out the iron concentrate. At the same time, the dried iron concentrate is continuously added to the discharge outlet to form a dynamic balance, that is, the balance between the feed and discharge, so that there is no fire or air leakage in this area, which fundamentally solves the drying workshop Serious pollution, low drying efficiency and high equipment failure rate;
13. The windward side of the intersection of the feed chute and the exhaust pipe is streamline, which reduces the resistance to the exhaust gas and reduces the probability of dust adhering to the feed chute.
The slag dryer, metal powder dryer, iron concentrate pellet dryer and other drying equipment designed by Changzhou Haomai drying Engineering Co., Ltd. are reasonable in design, excellent in production, stable in performance, advanced in technology, high in output and low in energy consumption, It can be used to dry slag, iron concentrate pellets, metal powder, fly ash, lignite and other wet materials to meet most of the customer's needs.
