What is the connection method for the main sulfur dioxide fan?

I have compared the above three methods for regulating air volume, and it turns out that the approach using an inverter, a speed increase gearbox, and a coupling is more energy-efficient and cost-effective, as well as more reliable. The investment can be recovered in about 2 years (an imported 2000KW inverter costs around 2 million). For sulfuric acid production plants with a capacity of less than 120,000 tons, the second option can also be considered, depending on the company’s financial situation.

Our plant uses No. 2 for the 120,000 tons of sulfuric acid

It is also possible to connect directly if power permits.

A turbine + coupling + fan is used

Reply to 2# Next Life: Using an inverter is costly, and its high power level can affect the operation of surrounding electrical devices

Reply to 2# Next Life: Frequency converters are used in various fields of industrial control thanks to their features of power saving, energy efficiency, reliability, and high performance. They ensure precise regulation, reduce the workload on workers, and improve economic efficiency; however, they also introduce certain interference issues. The power supply and electrical equipment on site can affect the frequency converter, and the high harmonics generated by the frequency converter during operation can also interfere with the operation of surrounding equipment. If the interference problems associated with the inverter are not resolved properly, not only will the system fail to operate reliably, but it will also affect the proper functioning of other devices. Therefore, it is necessary to explore the interference issues in inverter application systems in order to promote their further widespread use. Harm of harmonics and electromagnetic radiation: 1) Harmonics cause additional harmonic losses in electrical components within the power grid, reducing the efficiency of power transmission and distribution equipment as well as consumer devices. 2) Harmonics can be transmitted through the power grid to other electrical appliances, affecting the proper operation of many devices. For example, harmonics can cause mechanical vibrations in transformers, leading to local overheating, insulation degradation, and a shortened lifespan, which may result in damage; moreover, the harmonics that are transmitted can interfere with the normal functioning of electrical equipment. 3) Harmonics can cause local resonance in the power grid, thereby amplifying the harmonics. 4) Harmonic or electromagnetic radiation interference can cause the relay protection devices to malfunction, leading to inaccurate readings on electrical meters and even preventing them from functioning properly. 5) Electromagnetic radiation interference can disrupt weak electrical signals such as control signals and detection signals that pass near the output wires of the inverter; in severe cases, this can prevent the system from receiving accurate detection signals or cause disruption to the control system.

I agree with adopting 3: inverter + gearbox + coupling

Reply to 1# qhjhne: Our old fans use a hydraulic coupler + gearbox + coupling, while the new ones use an inverter + gearbox + coupling; both are good options.

Our old fans use a hydraulic coupling + gearbox + coupling, while the new ones employ a gearbox + coupling; the load is adjusted by adjusting the opening angle of the guide vanes at the fan inlet

Our fans use variable frequency drives, which deliver excellent results and are easy to use.