Method for filtering air on inlet side of centrifugal air compressor in smelting industry

Abstract

The invention relates to a method for filtering air on the inlet side of a centrifugal air compressor in the smelting industry. The method comprises the following steps that (1) the air quality grade in an equipment operating environment is determined; (2) when the air quality reaches the grade that the layer thickness of a reaction layer of reactant on the surface of a test piece is smaller than 2000 angstrom or larger than or equal to 2000 angstrom, the installation position of an inlet filter is raised according to the actual flying dust height on site, so that the surrounding environment of the equipment is preliminarily improved, corrosive gas in the air is analyzed, and a chemical filter material is manufactured; (3) a filter device with the chemical filter material is installed on the inlet side of the air compressor; and (4) a U-shaped water level gauge is installed at the rear end of the filtering device and used for judging whether the flow is enough or not and whether the inlet filtering device is blocked in a large area or not. The method is suitable for the smelting field. By means of the method, the chemical corrosion problem of an impeller, a volute and a cooler of the centrifugal air compressor in the smelting industry is solved fundamentally, the maintenance cost of the air compressor is reduced, and the service life of the air compressor is prolonged.

Description

technical field [0001] The invention relates to a method for filtering air at the inlet side of a centrifugal air compressor in the smelting industry, and is suitable for the smelting field. Background technique [0002] The smelting field usually needs to produce a large amount of compressed air to serve the main process line and provide qualified miscellaneous gas, dry gas and instrument gas. According to the requirements of usage volume and pressure level, modern smelters generally choose centrifugal air compressors as the main equipment at the gas supply end. There are belt corridors and main process workshops, etc., the environment is relatively poor, the air quality is not high, the dust is large, and the dust contains a large amount of sulfide or chloride. [0003] Due to the high-speed rotation of the rotor, the centrifugal air compressor has strict requirements on the vibration of the rotor. In order to ensure safe operation, the air quality requirements on the suc...

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Problems solved by technology

[0003] Due to the high-speed rotation of the rotor, the centrifugal air compressor has strict requirements on the vibration of the rotor. In order to ensure safe operation, the air quality requirements on the suction side are relatively high. However, the traditional filter can only filter large particles of dust, which is not good for the air mixed in the air. The sulfide and chloride in the filter do not have the filtering effect, so it is easy to cause:

[0004] A. The impeller and volute are bonded with dust and cause chemical corrosion. After the bond corrosion reaches a certain level, the high and low speed gears will vibrate greatly. It is necessary to frequently disassemble the compressor volute to clean the impeller bonded matter before normal operation. Too much cleaning will lead to changes in the dynamic balance of the air compressor rotor, resulting in high vibration values ​​after cleaning, and changes in the air flow channel, making the operation of the air compressor deviate from its operating characteristic curve, resulting in problems such as outlet pressure not up to standard , running in this environment for a long time will greatly shorten the service life; in severe cases, it will also cause equipment failure to stop, directly affect production, and even no matter how to clean it, it cannot be started normally;

[0005] B. The core of the cooler is subject to dust bonding and chemical corrosion. After the bonding corrosion reaches a certain level, the temperature between the stages will be high, and the compressed air cannot be cooled normally. It needs to be disassembled and cleaned before it can operate normally. Excessive cleaning will lead to the thinning of the cooler tube wall, which will cause internal leakage of the equipment, compressed air will leak into the cooling water, and cause a series of accidents. On the other hand, the fish scale copper inside the cooler will be corroded for a long time , which will cause the components to oxidize and age prematurely, causing the entire cooler to fail

[0006] For this problem and phenomenon, there are not too many countermeasures at present. The general method is to install the inlet filter in the factory building to reduce the inhalation of dust; or simply clean or replace the impeller, volute and cooler regularly, resulting in a large amount of inventory, Fund take and waste

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