Energy-Saving Approaches and Methods for High-Pressure Centrifugal Blowers

Energy-Saving Approaches and Methods for High-Pressure Centrifugal Blowers

According to surveys, the power consumption of high-pressure centrifugal blowers accounts for approximately 10% of national energy usage. National standards require these blowers to achieve an efficiency of 70% or higher, yet the average operational efficiency of existing units ranges only between 40% and 60%. High-pressure centrifugal blowers possess significant energy-saving potential. This paper aims to facilitate the development of energy-saving initiatives for high-pressure centrifugal blowers by briefly introducing methods and approaches for enhancing their energy efficiency. From the perspective of high-pressure centrifugal blower platform selection, promoting the use of high-efficiency, energy-saving models is a crucial energy conservation strategy. For instance, consider high-pressure centrifugal blowers. In the 1950s, the overall efficiency of internal models ranged from 50% to 65%, and new series of products emerged. Therefore, selecting new high-efficiency series and various specialized energy-saving high-pressure centrifugal fans is essential. Five key aspects must be considered when choosing a high-pressure centrifugal blower. Through analysis and calculation, reasonably determine the required air pressure and air volume. Conduct relevant tests or refer to actual measurement data from the equipment system to establish the maximum air pressure and air volume needed by the system. Considering testing errors in provided data and variations in machine performance during operation, air volume and pressure should be adjusted as follows: Q = (1.05–1.10)L; P = (1.00–1.15)P. From an energy-saving perspective, accurately calculate required pressure and air volume to minimize the gap between actual operating values and calculated data to within 10%, ensuring the high-pressure centrifugal blower operates within its high-efficiency zone. Additionally, to accurately determine adjustment methods and facilitate easier tuning, it is essential to estimate the common air pressure and minimum air pressure of the high-pressure centrifugal blower. 1.2 Select the appropriate high-pressure centrifugal blower type based on environmental conditions, such as moderate operating conditions and specific requirements, including explosion-proof high-pressure centrifugal blowers, dust-proof high-pressure centrifugal blowers, and sealed high-pressure centrifugal blowers. 1.3 Several methods exist for determining the high-pressure centrifugal blower model. One can select an enhanced performance curve and determine based on the specific performance curve of the high-pressure centrifugal blower model. Calculations and selection can be performed based on the performance curve or directly on the blower's performance. The operating point of the high-pressure centrifugal blower should be within the high-efficiency range. To ensure stable operation, the performance specification sheet must be selected. 1.4 When determining the adjustment plan, select the high-pressure centrifugal blower and decide the adjustment method based on the type of load. For high-flow applications, auxiliary adjustment methods like inlet orifice or cascade speed control may be employed. Variable speed control is suitable for low-flow or intermittent flow conditions. In variable-flow scenarios, the adjustment mode defines the flow variation range, i.e., the adjustment depth. 1.5 Conduct economic and technical comparisons of initial investment versus operational and management costs for integrated platforms. For specific pressure and air volume requirements, multiple high-pressure centrifugal blower types are typically available for selection. At this stage, it is necessary to compare the purchase, installation costs, power consumption, and operational management fees of the high-pressure centrifugal blower. Naturally, the machine purchase costs and operational/maintenance expenses required for various adjustment schemes must also be included. Unreasonable duct configuration not only increases resistance and wastes energy but also deteriorates the inlet and outlet conditions of the high-pressure centrifugal blower. This significantly reduces the blower's efficiency and adversely affects its performance. 2.1 Inlet Ducting The water flow at the inlet of the high-pressure centrifugal blower should be relatively uniform. If no connecting ductwork exists prior to the inlet, a relatively open space without nearby obstructions is required. A straight pipe section of at least 25 times the inlet diameter (inlet diameter) is needed before the high-pressure centrifugal blower inlet. This straight section must be perfectly aligned with the inlet elbow and other conical pipes. 2.2 The outlet pipe of the high-pressure centrifugal blower must also connect to a straight pipe section of at least 25mm (equivalent to the outlet diameter). If the outlet pipe cross-section expands, flow losses and energy consumption in the outlet pipe will increase. A reducer must be installed at the outlet of the high-pressure centrifugal blower. The expansion angle of the reducer must be below the expansion angle of the intelligent reducer. When the outlet pipe bends, a guide rod must be installed.