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The role of dust removal fan performance test in condition management

Release time: 2019/11/4 Click times: 1759

1. Conducive to the stable operation of the dust removal fan and its system The design of the dust removal fan and its system should meet the system's required flow rate and pressure. The operating point is near the high efficiency point of the dust removal fan. However, during long-term operation, due to blade deformation and increased pipe resistance, the efficiency of the dust removal fan will decrease year by year, and the power consumption of the motor will increase. At the same time, the air volume and air pressure will decrease to a certain extent, which can not meet the requirements of the system work. For example, taking a dust removal fan of a steel plant as an example, the fan efficiency measured in the 1999 fan performance survey was about 70%. Before the conversion of the converter and dust removal system in 2004, the fan was tested for performance. The measured efficiency of the fan is only 51%, and the output power of the motor is increased from 2 298 kW to 2 582 kW. Based on the annual operation of 8 000 h, it consumes about 2.2 million kW of electricity per year. In addition, the air volume and air pressure have also decreased to a certain extent, which can no longer meet the needs of new converter dust removal. An additional dust removal fan must be added.

For such high-power fans, it is necessary to use the performance testing technology of the dust removal fan to track the flow, pressure and efficiency of its operating conditions, and to perform timely maintenance and replacement of the inefficient dust removal fan.

2. Establish a mechanism to effectively supervise the operation efficiency of the dust removal fan equipment to prevent waste of energy.
Another example is that the original design air volume of a unit's hot air system was 46 000 Nm '/ h. After technical transformation and hot air system optimization, the required air volume of the system was reduced to about 28 000 Nm' / h, which saved energy. But while the system was being transformed. The dust removal fan in the system has not been adjusted accordingly. Just closing the valve in the small system to reduce the air volume, causing all the fans in the hot air system to appear as a "big horse drawn car", the fan work is extremely unstable. Especially for the two furnace gas fans, the operating point is close to the "surge point", which is more frequent. The improvement work of the dust removal fan of this system was implemented in 2005. Through the performance test of the fan, the working point of the dust removal fan was determined. Based on this, the dust removal fan was re-modeled to produce a fan with lower wind pressure but suitable for the current working conditions. Increased the safe operation of the dust removal fan. This not only ensures the safe operation of the dust removal fan, but also plays a role in energy saving.

3. Conducive to the improvement of the effectiveness of the configuration of the dust removal fan and the pipe network system. The dust removal fan always works in conjunction with its pipe network system. After the gas has obtained external work in the wind dust collector, the relationship between the pressure rise and the meteor is based on the performance of the fan. The pattern presented by the curve changes. When the gas passes through the pipe network, the relationship between its pressure rise and flow rate follows the characteristic curve of the pipe network. Therefore, the gas flow of the fan and the pipe network is completely equal. At the same time, part of the total pressure generated by the dust removal fan is used to overcome the resistance in the pipe network, and part of it is converted into the kinetic energy of the airflow at the Ft of the pipe network. The effective power of the dust removal fan is proportional to the total pressure of the fan. When used to overcome the increase in the resistance part of the pipe network, that is, the static pressure part, the kinetic energy of the airflow at the outlet of the pipe network will be reduced, that is, the flow of the dust removal fan will be reduced. . Therefore, poor pipe network layout will affect the performance of the fan. For example, structural forms such as pipe joints, elbows, and valves, or sudden expansion, shrinkage, and sharp bends of pipelines will increase the local force loss and reduce the efficiency of the fan system. Pressure loss in pipelines includes loss of resistance along the way and loss of local force limit. The resistance loss along the journey is determined by factors such as the air velocity, the length of the pipeline, the cross-section of the pipeline, and the roughness of the pipe wall. The local resistance loss is related to the cross-sectional area of the pipeline and the transition form of the pipeline.

Therefore, by testing the flow rate, static pressure and dynamic pressure of the pipe network, defects in the pipeline system can be found, and the section, length, smoothness of the inner wall and the transition forms of the ducts with different sections can be reasonably selected. Effectively reduce the pressure loss of the pipeline and improve the transportation efficiency of the pipeline. When the pressure or flow of a single dust removal fan cannot meet the requirements of the system, and multiple dust removal fans are required to be used in conjunction or in parallel, the pressure and flow of the system's operating point should be selected by the dust removal fan performance test method after the test. Match.

[Source: Suzhou Dingyu Energy Saving Equipment Co., Ltd.] [ Favorite this page ] [ Print this page ] [ Close ]
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