Analysis and solution of the three reasons for the high temperature of the exhaust of the compressor dryer

Analysis and solution of the three reasons for the high temperature of the exhaust of the compressor dryer Analysis and solution of the three reasons for the high temperature of the exhaust of the compressor dryer 1. High refrigerant pressure The cold dryer uses Freon and other refrigerator-like cooling devices to dry the compressed air. The refrigerant has high requirements on working conditions and external environment. For example, the flow rate of the circulating water of the water cooling unit will change the pressure and temperature of the refrigerant. . An increase in water temperature and a decrease in water flow can directly lead to an increase in refrigerant pressure. Generally, when the pressure rises to 0.18MPa, the refrigerant pressure reaches the upper limit, and the cold and dry unit automatically shuts down. Increased refrigerant pressure causes an increase in the exhaust pressure and exhaust temperature of the dryer unit. In this case, the refrigeration effect of the refrigerant system of the dryer is not effective, and the higher temperature of the compressed air cannot be processed in a timely and effective manner. The quality of the air is affected to a certain extent. If the user's process requirements are high, "this kind of compressed air is an unqualified product". The products produced by customers will also be waste products. The economic loss is great. Second, the heat dissipation of the precooler pipe is large The pre-cooler mainly dissipates heat through the pipeline, because the compressed air undergoes a compression process and the gas expands itself with a certain high temperature. It must be cooled through several processes to reach the normal use standard. The pre-cooler is a part of the dryer. As long as the compressed air is cooled by this component, the heat dissipation of the pre-cooler's pipes will increase, and its cooling effect will be affected. The exhaust temperature of the dryer is too high, which affects the quality of compressed air products. Therefore, when looking for the reason for the high exhaust temperature of the cold and dry machine, the large heat dissipation of the precooler pipe is a factor that cannot be ignored. The solution is to overhaul the pre-cooler and find out the problem of large heat dissipation in the pipeline. Third, the intake air temperature is too high, the intake air volume is large The intake air temperature is high. The cold dryer will not respond very quickly to its high temperature during processing. It cannot effectively reduce the intake air temperature in a timely manner. Naturally, it will cause the exhaust temperature to increase. The temperature of the intake air of the dryer is determined by the compressor exhaust temperature. When the temperature of the compressed air exhaust is high, it generally enters the cold dryer through the secondary cooling of the buffer tank first, but some have buffer tanks, and some small equipment do not have special buffer tanks. Entering the dryer directly causes the intake air temperature of the dryer to be higher. There are many reasons for the high discharge temperature of the air compressor. The main reason is the poor effect of the cooler or failure. Sometimes it may be that after the compressor runs for a certain period of time, there are many scales inside the water-cooled compressor cooler, which blocks the cooler, causing the exhaust temperature to increase. Cooler scale clogging is generally not easy to be paid attention to, especially for screw units, because “generally, the circulating water used by screw units is more often than clean circulating water," and there are more impurities in the clean circulating water. Less, therefore, it is slower to form scale, but there is also the possibility of scale formation. Once the scale is formed, it is not discovered in time, it will generate high temperature. Only after the scale is cleared can the phenomenon of excessive exhaust temperature be eliminated. Clogged oil filters and oil-water separators can also cause high temperatures. Oil filters and oil-water separators are generally composed of paper fiber cotton-like materials and wire meshes. These materials can effectively filter particles and other impurities in air and grease. And the impurities that are going to settle at the bottom of the filter are discharged as waste oil and water, but this kind of failure is sometimes not easy to find, sometimes the impurities are adsorbed on the fiber cotton, and it is not easy to be clear. Device. The filter fails, the compressor exhaust temperature rises, and it is necessary to replace the oil filter and the oil and gas separation filter in time. However, “some machines have replaced the new oil-gas separation air core in time." The exhaust temperature is still very high. There are two possibilities here: one is that the alarm of high exhaust temperature at that time has not been lifted. The alarm system does not recognize it. Even if the filter core is replaced. It is still an alarm, but this alarm is a false alarm, as long as it is eliminated on the operation panel. Some operators do n’t know this situation, or do n’t dare to operate it, or because it is displayed in English, which brings trouble to the identification. There is another type of problem, that is, some compressors are very sensitive to the design of the oil and gas separator, it is the upper part of the gas, the lower part is the oil, and the failure on the operation panel is not an oil-rich alarm, it is a gas-rich alarm. Both alarms affect the normal operation of the equipment. Only after the pressure of the oil and gas is balanced, this alarm phenomenon can be eliminated. But it is not an easy thing to really eliminate it. This situation will also cause false alarms caused by the exhaust temperature. The other is that the heat sink of the air cooler has thick dust, which prevents it from dissipating heat normally, and the dust should be blown off in time. Furthermore, the intake air volume is large, making it impossible for the dryer to process so much compressed air as soon as possible, and it can only be treated in a hurry, and then quickly discharged. In such a case, the exhaust temperature of the dryer will naturally increase. The amount of compressor displacement is sometimes related to the compressor's pipe network system. It may be that when the air volume is small, the compressor's displacement is not adjusted in time, resulting in an increase in displacement. Generally, frequency conversion technology should be used. Adjust the displacement of the compressor. However, most of the existing compressors do not have frequency conversion technology. It is quite difficult to automatically adjust the air intake of the compressor. If a qualified company "can transform the compressor with frequency conversion technology", the general frequency conversion technology conversion requires 10,000 to tens of thousands of yuan, depending on the size and difficulty of the compressor. The cost of the frequency conversion technology conversion is generally within three months The investment can be recovered within a few years. This is a method to solve the excessively high exhaust temperature of the cold dryer, and it is also a good way to save energy and electricity.

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