Today we will briefly introduce to you how to apply the air filter after the air compressor in the generator.
The harm of dust to the air compressor: the population filter of the generator air compressor is mainly to remove dust particles in the air and prevent the dust from affecting the balance of the compressor impeller. Dust has three hazards to high-speed aerodynamic equipment:
(1) Scaling. Small particle dust (particle size <5, um) forms solid scaling inside the equipment, which affects the airflow movement, reduces the operating efficiency of the equipment, drifts the "surge curve", destroys the dynamic balance of the impeller, and increases the shaft vibration of the rotor. , resulting in the diesel generator being forced to shut down for maintenance.
(2) Wear. Large particles of dust (particle size ≥ 5, um) hit the blades and airflow channels, causing surface wear.
(3) Corrosion. Corrosive dust causes chemical corrosion of equipment. In petrochemical plants, where aerodynamic equipment must run year-round, downtime can mean downtime. In order to ensure their trouble-free and high-efficiency operation, and to minimize the number of downtimes and maintenance workloads, it is necessary to install an air filter with excellent performance at the air intake to reduce dust damage to the equipment. The filtration effect of the air filter directly affects the long-term operation of the air compressor.
Performance indicators of air compressor air filter: The performance indicators of the filter are mainly the dust removal efficiency, resistance and the dust holding capacity of the filter. The definition of dust removal efficiency is the percentage of dust captured by the filter to the total dust brought into the filter by the gas, usually expressed in r/.
That is =(G2/G1)×100% In the formula: G1:——g/h of dust with filter in unit time; G2:——g/h of dust captured by filter in unit time.
Different particle diameters have different dust removal efficiencies. When measuring the dust removal ability of the filter, the size of the particle size must be specified. The comparison is made under the premise of the same particle size, which is the classification efficiency. Resistance refers to the pressure drop of gas passing through the filter, the smaller the better under the premise of ensuring the filtration accuracy. As the resistance of the filter gradually rises, it will affect the inlet pressure of the air compressor, causing the energy consumption of the air compressor to increase; when the resistance is too large, it will also cause the air compressor to surge. Therefore, when the resistance of the filter reaches or is close to the allowable vacuum pressure of the air compressor, the filter material should be replaced in time.
The dust holding capacity of the generator indicates the amount of dust captured by the unit area of the filter from the time when the filter material starts to work to the time when the filter material needs to be replaced, expressed in g/m2. This indicator reflects the consumption of filter materials and the production cost of filters.
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