The Roots blower in power plants is a key equipment for forced ventilation, high-pressure gas delivery, and other processes. Its structural characteristics and performance advantages can support complex working conditions. The following analysis is based on core functions, technical characteristics, application scenarios, and selection recommendations:
1、 Core functions and operating principles
The Roots blower rotates synchronously in reverse within the cylinder through two "8" shaped rotors, utilizing the sealed chamber formed by the rotors and cylinder wall to achieve gas compression and delivery. Its forced gas transmission characteristics keep the flow stable during pressure fluctuations, making it suitable for scenarios that require continuous and stable gas supply. In power plants, this equipment can be used for boiler forced ventilation, flue gas desulfurization and pressurization, etc., to ensure that combustion efficiency and environmental indicators meet the standards.
2、 Technical characteristics and performance advantages
Traffic stability
The flow fluctuation within the pressure regulation range is less than 5, which can cope with the fluctuation of pipeline resistance caused by changes in power plant load. For example, stable gas supply can still be maintained when adjusting the combustion conditions of the boiler.
Medium cleanliness
The rotor gap sealing technology ensures that the discharged gas does not contain lubricating oil, avoiding pollution to the thermal system of the power plant, and is suitable for processes that require high purity of the medium.
Wide pressure adaptability
The single-stage pressure ratio can reach 1.7, and the pressure range after multi-stage series connection covers 9.8kPa to 196kPa, which can meet the pressure requirements of different process links in the power plant, such as the pressure requirements of the desulfurization system booster fan.
Temperature resistance and corrosion resistance
By using high-temperature resistant bearings and stainless steel materials, stable performance can be maintained and equipment life can be extended when transporting hot air below 150 ℃ or sulfur-containing flue gas.
3、 Typical application scenarios
Boiler forced ventilation
In coal-fired power plants, Roots blowers provide primary and secondary air to boilers to ensure complete combustion of fuel. Its air volume regulation range is wide and can adapt to different needs of 300MW to 1000MW units.
Flue gas desulfurization and pressurization
In the wet desulfurization system, the Roots blower provides oxidizing air to the absorption tower, promoting the oxidation of calcium sulfite. Its corrosion-resistant design can adapt to flue gas environments containing SO, ensuring desulfurization efficiency.
Ash conveying
In the pneumatic ash removal system, the positive pressure airflow generated by the Roots blower can transport fly ash to the ash silo, with a conveying distance of over 500 meters, reducing the cost of manual ash cleaning.
4、 Key parameters for selection
Flow and pressure matching
Calculate the required air volume based on the tonnage of the boiler or the scale of the desulfurization system. For example, the air volume requirement for the primary fan of a 600MW unit boiler is about 150m3/min, and the pressure requirement is 25kPa.
Material and protection level
When transporting sulfur-containing flue gas, 316L stainless steel material with a protection level not lower than IP55 should be selected to adapt to the high temperature and high humidity environment of power plants.
Energy efficiency and noise control
Priority should be given to selecting models with isothermal efficiency ≥ 75, and equipped with mufflers to ensure noise level ≤ 85dB (A), meeting the environmental protection requirements of the power plant.
Redundant design
The key link (such as desulfurization oxidation fan) needs to adopt a "one in use, one backup" configuration. In case of a single equipment failure, the backup fan can automatically switch to ensure the continuous operation of the system.
