Smelting Roots blower is a gas conveying equipment designed specifically for the smelting industry. Based on the basic principle of Roots blower, it achieves continuous gas conveying and compression by synchronously rotating two three or two bladed impellers in the cylinder in reverse. Its core advantages lie in stable flow rate, wide pressure range, compact structure, and high temperature resistance, which can meet the needs of high pressure, large flow rate, and continuous operation in smelting processes. The following is an explanation from four aspects: technical characteristics, application scenarios, selection points, and maintenance:
1、 Technical features
1. Forced gas transmission characteristics: Roots blower belongs to positive displacement blower, with stable flow rate at constant speed, independent of outlet pressure changes, suitable for scenarios where gas flow rate needs to be controlled in smelting.
2. Pressure adaptability: Single stage pressure rise is usually ≤ 58.8kPa, and two-stage series connection can increase it to 117.6kPa, meeting the requirements of smelting blast furnace blowing, converter steelmaking and other processes.
3. High temperature resistant design: using high temperature resistant materials (such as cast iron, stainless steel) and special sealing structures, it can withstand high temperature gases in the smelting environment (inlet temperature ≤ 40 ℃).
4. Low vibration and noise: The three bladed impeller design reduces gas pulsation, with a vibration speed of ≤ 4.5mm/s and noise of ≤ 85dB (A), meeting the requirements of industrial environments.
2、 Application scenarios
1. Blast furnace blowing: providing high-pressure air for ironmaking blast furnaces, promoting coke combustion, and maintaining a high temperature reduction environment inside the furnace.
2. Converter steelmaking: blowing oxygen or oxygen enriched air into the converter to remove impurities such as carbon, silicon, and manganese from the molten iron and improve the quality of the molten steel.
3. Smelting furnace gas supply: provides the necessary air for combustion in the smelting furnace, ensuring full combustion of fuel and improving thermal efficiency.
3、 Key selection points
1. Flow and pressure matching: Calculate the required air volume (m3/min) and pressure (kPa) based on the smelting process requirements, and select the appropriate model. For example, the 150 type has a flow range of 10.39-27.05m3/min and a pressure increase of 9.8-58.8kPa.
2. Material selection: High temperature environments require the use of heat-resistant cast iron or stainless steel materials to prevent component deformation or corrosion.
3. Sealing performance: High sealing structures such as labyrinth seals and mechanical seals are preferred to avoid gas leakage affecting smelting efficiency.
4. Motor power: Reserve a power margin of 10-15 based on the fan shaft power and actual operating conditions to ensure long-term stable operation.
4、 Maintenance and upkeep
1. Regular inspection: Check the oil level, temperature, and vibration value daily, clean the air filter weekly, and check the gear wear condition monthly.
2. Lubrication management: Use ISO VG 32-46 lubricating oil, change it every 2000 hours, and change the oil for the first time after 200 hours of operation.
3. Gap adjustment: Regularly calibrate the gaps between the impeller and the casing, as well as between the impeller and the side plate, to ensure that the total gap is ≤ 0.4mm and prevent collision wear.
4. Fault handling: When abnormal vibration, noise, or temperature rise is detected, immediately stop the machine and inspect key components such as gears and bearings, and replace worn parts in a timely manner.
5. Typical case: A steel plant uses a 200 type Roots blower to supply air to the blast furnace. By optimizing the gear clearance to 0.12mm and upgrading it to a mechanical seal structure, the lifespan of the blower is extended to over 8 years, and the annual failure rate is reduced by 60%.
The smelting Roots blower can significantly improve smelting efficiency and product quality through precise selection and scientific maintenance, and is an indispensable key equipment in modern smelting processes.
