We know that in the biological contact oxidation treatment, aerobic microorganisms need to consume dissolved oxygen when they oxidize and decompose organic matter, so it is necessary to supplement dissolved oxygen to sewage in time. Using microporous aerator, the oxygen transfer rate is 25% – 32%. Roots blower is a volume rotary blower, which is the basic equipment of blowing, transferring oxygen and aeration in biochemical reaction process of sewage treatment plant. The most important feature of the system is that when the pressure is adjusted within the allowable range, the flow rate changes little, and the pressure selection range is wide.
What kinds of Roots blower can be used in sewage treatment process?
There are many sewage treatment processes, and there are many types of Roots blowers used. Today, EVP vacuum pump manufacturer briefly introduces the types of Roots blowers used:
The types of blowers in sewage treatment process include roots blower, centrifugal blower, magnetic suspension blower, air suspension blower, air compressor and ventilation equipment.
(1) The characteristic of Roots blower is that in the design pressure range, when the resistance of pipe network changes, the flow change is very small, and the work adaptability is strong. Three leaf roots blower has high efficiency and small air flow pulsation. Stable operation and low noise.
(2) The magnetic levitation blower is characterized by advanced magnetic bearing technology, gearbox free frequency conversion high-speed motor and oil-free and non-contact magnetic bearing, which ensures the economic and reliable operation of the blower and reduces the amount of maintenance. The whole blower has compact structure, small volume, light weight and no vibration.
(3) The air suspension blower adopts the air cooling system of “high speed direct connected motor” and “air suspension bearing”. It has the advantages of high efficiency, low noise, energy saving and environmental protection, reliable operation, and the air inlet flow of the blower can be adjusted in the range of 40% ~ 100% only by controlling the motor speed with frequency conversion.
Roots blower is simple in principle and structure, stable in performance and easy to manage and maintain. However, the safe operation and service life of the blower ultimately depends on the normal use and standard maintenance of the equipment. It is necessary to strengthen the three-level inspection system of the equipment and deal with the abnormal or hidden trouble in time to ensure the safe, reliable and stable operation of the fan.
First of all, roots blower must be started under no-load condition. Before starting, all inlet and exhaust valves of the fan shall be opened. After normal starting, the valves shall be adjusted gradually to make the air volume reach the required value. It is not allowed to adjust to the rated air volume once. Roots blower should not be shut down suddenly under full load operation. It is necessary to gradually reduce the air volume before shutdown, so as to avoid damaging the fan.
In the process of normal operation, each shift of the post personnel should regularly carry out patrol inspection, focusing on whether the bolts in each part are loose, whether there is oil leakage in the lubricating parts, whether the bearing temperature at both ends and the fan shell temperature are normal, and make various inspection records. Regularly check the lubrication and cooling system of Roots blower, pay attention to the quality of lubricating oil, and listen carefully to whether there is noise in the operation of blower, so as to judge the operation of rotor shaft and impeller.
Secondly, the overload or abnormal operation of Roots blower is gradually reflected. There is a quantitative change process. It is necessary to pay attention to the inlet and exhaust pressure of the fan, the temperature rise of the bearing and the running load current of the fan motor. If the above parameters fluctuate, it is necessary to carry out a comprehensive diagnosis and inspection of the fan, and deal with it in time to avoid further expansion of the fault.
The roots blower shall be overhauled once a year regularly, and the clearance between impeller and impeller, impeller and shell, impeller and wallboard shall be inspected and adjusted in time. If the clearance exceeds the allowable range, experienced maintenance personnel shall be responsible for adjustment. It is forbidden to make random adjustment to ensure the rated air supply volume of borz blower, ensure the safe operation of Roots blower and maximize the extension The service life of Roots blower.
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