Application of Water Jet Descaling Technology in DH Air Compressor Liu Guiyan Yu Demei Qianghong Li Ying Shenyang Blower Group Co., Ltd. Chang Baoqiang Shenyang Machine Tool Group Co., Ltd. Press, and technical requirements for water spray descaling And effects.

1The water spray system passes through the inlet filter before the air enters the air compressor, but when entering the air compressor, the impeller volute will be polluted to different degrees, such as the formation of carbon deposits and corrosion, which will lead to air pressure. Machine efficiency is reduced, energy consumption is increased, and vibration is increased. Therefore, the design of the water spray system can effectively flush the attachments in the impeller flow path. Thereby maintaining a better balance state and higher efficiency of the air compressor rotor. This kind of water spray system has been used by more than ten enterprises in China, and all have achieved good results. The water spray system is mainly composed of a nozzle water pipe total water pipe and a pressure water tank 4, 1.

Air water 4 cylinder design calculation 2 Washing method and effect 2.1 Flushing method The method of flushing the water spray system to remove the attachment is to use the nozzle to spray the atomized water to rinse, the diameter of the droplet is less than 1, accounting for the total number of 5065, with the airflow belt In the impeller blade diffuser and volute of the rotary air compressor. When the air compressor is running, the clean water is directly injected into the inlet passage of the impeller. Since the raw material air carries water, the water sprayed from the nozzle can cover the impeller, fill the entire flow passage, and the impeller rotates at high speed to hit the droplet of water droplets, thereby effectively The attachment in the impeller flow path is washed away to achieve the flushing effect. Moreover, the water passing through the air compressor passes through the interstage cooler, and also has a cleaning effect on them. When cleaning, open the intercooler drain pipe or trap. When the turbid water is drained, the deposit has been washed down until the water is drained.

2.2 Flushing requirements Water quality is best to use completely demineralized water as the spray medium boiler soft water. For example, urban water needs to be filtered to make it free of hard particles.

The amount of water does not exceed the maximum amount allowed by the gas.

The water pressure must be higher than the 0.040.1 level of the inlet air pressure to atomize the sprayed water.

The water tank capacity can be selected as 3000 B.

The optimal time for flushing or timing flushing is done before the equipment is shut down. The air compressor outlet pressure can be reduced, and the exhaust gas temperature is lowered, so that the thermal stress of the impeller can be reduced. At present, there is also flushing in the operation of the air compressor, which is called online flushing. At this time, the inlet vane adjuster should be partially closed to reduce the load of the air 1 and prevent the torque of the pinion shaft from being excessive due to the flushing of the impeller.

The interval and number of flushing intervals are different due to different environments and different deposits due to different environments. Under normal circumstances, users who spray in 12 months or half a year can also decide the frequency and time of spraying according to the actual situation. It can be flushed step by step or single-stage flushing. Usually, the number of flushing in the first stage is more than that in the first level. Further, whether or not flushing is required is mainly determined mainly based on the amplitude of the shaft vibration, power consumption, and the like.

2.3 Flushing Steps Generally, the flushing starts from the first stage impeller of the air compressor, and then flushes to the final stage impeller in turn, or it can be flushed in a single stage.

2.4 Flushing effect The daily evaluation of the running performance of the compressor is a better method compared with the design parameters, but a lot of work is required. In order to simplify the evaluation procedure, for the compressor, three simplified formulas can be used to convert the pressure temperature and flow into thermodynamic parameters, so that the performance of each stage before and after rinsing can be compared in the field. The effect of spray washing.

The calculation formula is the standard flow measured by the QN flowmeter, the inlet pressure of the wind 1 Ps, and the other formulas on the inlet temperature of the leg Ts.

The above formula applies only to dry gases, ignoring the effect of moisture content in the air.

3 Conclusions The attachments on the impeller blades of the compressor are flushed by water spray, the rotor is basically close to the original equilibrium state, the flow passage area is increased, the blade profile is similar to the original design line, and the compressor amplitude is close to the normal value. The machine runs smoothly, the life is extended, the flow rate is increased, the energy consumption is reduced, and the working efficiency of the compressor is improved. At the same time, due to the reduced amplitude, bearing seal oil seal gears, many foreign large air separation devices, the use of water spray technology. It has been proved by practice that the unit runs smoothly and has obvious energy saving effect.

In the early 1980s, the Drum Group began to introduce technology to produce air compressors. So far, it has produced more than 200 units, and more than 10 compressor units have been equipped with water spray systems. At the user's site where the water spray system is installed, after the test, the pressure temperature and flow rate before the water spray are compared with the performance of each stage after the water spray, and the effect has been achieved. It is seen that the spray washing effect is very significant. The expected results were achieved. In addition, when the atmospheric environment is not good and the atmospheric conditions are acidic, the use of this technology is expected to produce more significant economic benefits.

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