Roots blower It occupies an important position in the smelting industry. The main smelting processes from ore to steel making include ore sintering, ironmaking and steelmaking, that is, fans are required in all processes of steel smelting. 1. Ancient air blower for sintering
The ore for smelting shall be sintered before smelting. Sintering machine shall be used for sintering, and the main exhaust fan and cooling fan of flue gas shall be used for sintering furnace.
2. Roots blower for coke oven gas transmission
Coke is the main fuel and reducing agent for steel smelting, as well as the proppant and loosening agent for the particles in the blast furnace. After being pumped out by the fan, the gas in the coke oven must be partly used as the fuel of the coke oven, partly pressurized and sent to the steel plant as the fuel, and the other part used to produce other by-products.
The typical representative product of coke oven gas transportation is Roots blower, whose main structural feature is that the unit is composed of motor, gear booster engine, centrifugal blower, lubrication system and instrument control system. The casing is of horizontal split structure, and there are horizontal and longitudinal positioning keyways under the bearing box to keep the body well aligned and adapt to the thermal expansion of the casing; The bearing box and housing are cast together to enhance rigidity and facilitate disassembly and maintenance.
The rotor is composed of main shaft, impeller, spacer sleeve, balance plate and half coupling; The impeller is welded with high-strength alloy steel.
The bearing is divided into support bearing and thrust bearing. The support bearing is elliptical pad sliding bearing, and the thrust bearing is Mitchell double-sided thrust sliding bearing. The seals are located between stages, at the inlet of impeller, around the balance plate and at both ends of the shaft. They are labyrinth type snap ring seals.
3. Blast furnace blower
In the process of pig iron smelting, the blast furnace blower must be used to transport a certain amount of combustion supporting air (or oxygen) to the blast furnace to increase the furnace temperature. In addition, it is necessary to send combustion air to the centrifugal fan in the hot blast furnace.
The oxygen for the iron and steel industry lies in strengthening the smelting process. In steelmaking, it is used for oxygen top blown converter steelmaking, oxygen bottom blown converter steelmaking, open hearth furnace oxygen blowing steelmaking, electric furnace oxygen steelmaking, etc. In particular, oxygen top blown converter steelmaking has become a major way for the rapid development of iron and steel industry. The amount of oxygen used in steelmaking is very large. It is obtained by deep freezing from the air using air separation equipment. Air compressor, oxygen compressor, heating blower and turbine expander must be used in each set of oxygen generator, which is commonly referred to as "four major oxygen generators"
4. Converter secondary flue gas dedusting fan
The converter secondary flue gas dedusting system refers to the flue gas collection and dedusting at all dust raising points except for the purification and recovery of converter flue gas. Including converter iron mixing, converter converting, argon blowing station, hot metal slagging station and hot metal pouring station.
5. Centrifugal compressor for power station of steel plant Centrifugal compressor is developed on the basis of imported technology. The main feature is the overall assembled structure, and a common base is used for the compressor, gearbox, intermediate gas cooler and lubricating oil system. The inlet is equipped with inlet regulating blades, which is the most economical method to optimize the operating performance of the compressor at non operating points. The inlet regulating blade is automatically adjusted according to the actual operation on site, which can realize the constant pressure output of the compressor outlet in the change of air flow.
6. Cupola fan
In addition to the fans required in the steel smelting process, the cupola (such as cupola, oil furnace and pulverized coal furnace) commonly used in general mechanical foundry plants need to use blowers (high-pressure fans or blowers) to press enough air to support combustion.
7. Blast furnace gas residual pressure recovery turbine power generation device
The blast furnace gas residual pressure recovery turbine power generation device is an energy recovery device that uses the gas pressure at the top of the blast furnace to expand and work through the turbine to drive the generator to generate electricity. The TRT device not only recovers the energy released by the original pressure relief valve (about 30% of the energy required by the blast furnace blower), but also purifies the gas, and improves the control quality of the blast furnace top pressure.
