Water-Cooled Roots Blower
News 14.06.2022
A water-cooled Roots blower is a special high-pressure, heavy-duty and high-temperature resistant blower equipped with a circulating water cooling system based on a standard Roots blower. Its core function is to solve the problem of excessive temperature rise during high-pressure / long-time operation.
I. Working Principle
- Gas Delivery (Same as Standard Roots Blower)The motor drives synchronous gears to rotate a pair of 8-shaped / three-lobe rotors in reverse directions, forming closed volume chambers inside the casing. Gas is forcibly pushed from the inlet to the outlet (a positive displacement blower with stable flow and pressure determined by load).
- Water Cooling (Core Difference)Cooling water jackets / channels are built into the casing and bearing housing.
- Circulating cooling water (softened water) flows through the channels to absorb heat generated by rotor compression, gas compression and bearing friction.
- Hot water flows out, is cooled by a cooling tower / heat exchanger and then recycled.
- The casing temperature is stably controlled at 60–90°C.
II. Structural Features
- Casing: with surrounding water cooling jacket (double wall).
- Bearing Housing: built-in cooling chamber for direct bearing cooling.
- Rotors: made of ductile iron / stainless steel, thickened, high-temperature resistant and high-precision.
- Water Cooling Circuit: water pump, filter, pipelines, temperature control valve.
- Gearbox: optional oil cooling (lubricating oil cooled by heat exchanger).
III. Water-Cooled vs. Air-Cooled (Key Differences)
表格
| Item | Water-Cooled Roots Blower | Air-Cooled Roots Blower |
|---|---|---|
| Cooling Method | Forced cooling by circulating water | Natural / fan air cooling |
| Applicable Pressure | > 58 kPa (high pressure) | ≤ 58 kPa (medium & low pressure) |
| Heat Dissipation Efficiency | High, precise temperature control | Average, affected by environment |
| Continuous Operation | 24-hour uninterrupted operation available | Prone to overheating at high temperature / pressure |
| Applicable Gas Temperature | Transport gas ≤ 150°C | Transport gas ≤ 80°C |
| Maintenance | Scale prevention and frost protection required | Simple |
IV. Main Advantages
- Stable High Pressure: Pressure up to 120–300 kPa.
- Precise Temperature Control: Avoids rotor thermal expansion seizure, lubricating oil failure and seal aging.
- Longer Service Life: Extends bearing and gear life by 1–2 times.
- Continuous Reliability: Suitable for 24-hour full-load and high-temperature environments.
- Gas Quality Protection: Prevents deterioration when conveying chemical gases, special gases.
V. Typical Applications
- Chemical & Petrochemical Industry: High-pressure / high-temperature delivery of chlorine, ammonia, coal gas, biogas, etc.
- Wastewater Treatment: Deep water aeration (high pressure, long-time operation).
- Electric Power & Metallurgy: Boiler material return, blast furnace air supply, flue gas desulfurization.
- Pneumatic Conveying: Long-distance high-pressure conveying of powder and granular materials.
- Aquaculture: Deep water oxygenation (high pressure, high-temperature environment).
VI. Operation & Maintenance Tips
- Water Quality: Must use softened water / pure water to prevent scaling and clogging of water channels.
- Water Pressure: Inlet water pressure 0.2–0.4 MPa.
- Water Temperature: Inlet water ≤ 30°C, outlet water ≤ 60°C.
- Daily Inspection: Check water pressure, water temperature and water leakage.
- Regular Maintenance: Clean filters, remove scale annually (citric acid cleaning).
- Frost Protection: Drain all cooling water if shutdown for a long time.
VII. Selection Recommendations
Transport medium temperature > 40°C → Choose water-cooled type.
Pressure > 58 kPa → Choose water-cooled type.
24-hour continuous operation → Choose water-cooled type.
High ambient temperature & poor ventilation → Choose water-cooled type.
