Production and construction analysis of the air compressor exhaust temperature is too high troubleshooting and transformation text, Sun Peng Hao Jianyu Xia Yougang Liu Lingyu Shandong Huaju Energy Company Jidong Xincun Power Plant Hill summary high exhaust, the degree is the air compressor due to the system Various questions, rise faults. If the air compressor is running without sufficient lubrication or cooling, the body will sit in the high temperature for a long time. Excessive oil, lower the number of gas transmissions and increase the power consumption, the lubricating oil dryness will also be reduced, too high temperature will also change the physical coefficient value of the rotor and bearing materials, causing the bearing to produce abnormal friction, There is even a bearing loose-beading accident. If the degree is too high, the lubricating oil will be heated under the catalysis of the metal to generate free carbonic acid and moisture carbon which are harmful to the work. In severe cases, the whole host screw will be stuck or stopped. Jump phenomenon, which affects the normal production of enterprises.
In addition to the cooling reform, the air compressor is a kind of mechanical equipment for compressing gas. The compression of the gas is achieved by a change in volume, which is achieved by the rotary motion of the rotor in the casing by the compressor. After the air is compressed, it is work on the air. The temperature must be raised. After the heat is transferred, it is transmitted to the cylinder block. The cylinder body is heated. When the heat is overheated, the temperature of the discharged air exceeds the specified value. However, the temperature will also change the physical coefficient of the rotor and bearing materials in the body. In severe cases, the whole host will be locked and stopped. Although the air compressor manufacturers have installed protection devices at high temperatures, they are faulty. The existence of this protection device will also cause the protection device to operate frequently, which affects the normal production of the enterprise.
Our factory uses 3 sets of CommScope oil-injected screw air compressors introduced in 1998. The model, 3 power 17 equipment implements two operation of the machine, that is, two operating platforms are used for standby. The gas production time is 86,000 hours and 84,000 hours respectively. Ten thousand hours. Due to the long operating time, the equipment is often operated at a higher exhaust temperature of 76.0, 95., more, even up to 2, especially in summer. In the conventional treatment methods, such as replacing the lubricating oil air cleaner to clean the oil cooler cooling water line or even replacing the new temperature control valve, the effect is still not satisfactory.
Air compressor failure introduction High exhaust temperature is the most common failure of screw air compressor, which is the most harmful. Usually, the operating temperature of the screw air compressor is between 65 and 85. The maximum exhaust temperature of the machine is set to Celsius. When this temperature is exceeded, the alarm will be automatically stopped. If the equipment is operated under high exhaust temperature conditions for a long time, too high temperature will cause changes in the physical coefficient values ​​of the rotor and bearing materials, causing abnormal friction loss of the bearings and even bearing loose beads accidents. Excessive oil temperature will also lower the gas transmission coefficient and increase the power consumption, and the viscosity of the lubricating oil will also decrease. If the temperature is too high, the lubricating oil will be thermally decomposed under the catalysis of the metal to generate free carbonic acid which is harmful to the work and If the water is carbonized, it will cause the whole host screw to jam or stop jumping. Although the air compressor is equipped with a protection device for preventing high temperature, the malfunction is often produced.
The failure caused by the high temperature of the air compressor cooler was excluded at noon on July 24, 2007. At that time, during the hot summer, the temperature of the engine room had exceeded 4, and the high temperature alarm of the air compressor stopped. Because the system urgently needs to use the wind to transport the ash, the operator violates the rules without clearing the cause of the failure. After several starts and stops, the temperature control device is disconnected from the equipment and put into operation. After ten minutes of operation, the host screw is stuck. .
After the disintegration of the host, it was found that the bearing was damaged, the yin and yang rotor and the stator were strained, and the end cap was seriously worn. After the disintegration of the oil cooler circulation pipeline and other components, it is analyzed and confirmed that the cooling water pipeline in the faulty oil cooler is blocked by scale, resulting in a decrease in the efficiency of the lubricating oil radiator, and the gap increase after the bearing damage caused by the excessive oil inlet temperature. Large, the axial and turbulent displacement of the yin and yang rotor, causing strain on the yin and yang rotor and stator, the end cover is severely worn. The main reason for the excessive oil temperature is caused by the failure of the oil cooler. Because the cooling water pipeline in the oil cooler is thin, the water is fouled by heat and fouling, causing the pipeline to become clogged, resulting in insufficient cooling water flow, so that the oil temperature cannot be lowered.
In response to the question of the accident, solving the problem of cooling water has become a top priority. Most of the oil cooler failures are closely related to the water cooling system. The conventional treatment method for the cooling pipeline is to add a descaling agent and a chemical in the cooling water, and use a water pump to drive the pressurized water into the oil cooling water pipeline to be immersed and repeatedly rinsed, and the cleaning effect is better, and the scale can be removed. . However, the descaling agent is highly corrosive, and frequent washing will make the pipe wall thinner, which will affect the pressure resistance and service life of the pipe. To solve the problem fundamentally, the cooling water is used in the initial stage of use, and drinking tap water is used. With the shortage of water resources and the rising price of water, it is a big economic burden for enterprises. After repeated trials and demonstrations, the use of treated water from sewage treatment plants instead of drinking tap water for cooling water is used to save resources and reduce costs. It is a good choice for enterprises regardless of economic benefits or environmental protection. At the same time, the water pressure caused by the shortage of tap water is prevented from being unstable, and the temperature difference fluctuates greatly, and the malfunction caused by fouling or blockage of the wall of the cooling water system is also reduced.
1 Add a water treatment system, softly re-treat the water, so that it is not easy to scale, use a pressure pump to drive into the cooling pipe to increase the pressure. Install a filter at the water inlet and clean the filter regularly. This maintenance is simple and convenient, while reducing the equipment failure rate and extending the system life cycle.
2 Remove the original water main pipe, increase the diameter of the pipe from the original 20 to 40 to increase the flow area, remove the original recoil waterway, replace it with the inner wall smooth 15 cm to 纟 20 cm, reduce the scale After the pipe wall is built, the resistance of the cooling pipe is reduced and enters the purpose of the oil cooler.
After the system is modified and used, the cooling effect of the equipment is obviously improved, and the temperature rise phenomenon is basically eliminated. The air quality is better, the fuel consumption is reduced, and the efficiency of the air compressor is also increased accordingly. Through the above reform measures, the air compressor has been running continuously until now, and the phenomenon of high exhaust gas temperature has not occurred again. The air compressor can run for a long time under any weather conditions and load conditions, and the exhaust gas temperature can be controlled between 80 and 90. It is completely operated within the ideal temperature range of the screw air compressor, and the economic benefits of the enterprise are also obviously improved.
In order to ensure that the air compressor can run smoothly and reliably for a long time and extend the service life of the unit, it must be operated strictly in accordance with the equipment operation rules, develop detailed maintenance plans, regularly check and maintain, keep the equipment clean, and reduce dust and debris intrusion into the oil cooler cooling pipeline. Wait, make sure the cooling system is unobstructed.
Xing Ziwen's theoretical design and application of screw compressor. Beijing Machinery Industry Press 2008; 6 Lan Yunliang Air Compressor Technology Northwestern Polytechnical University Press. 2008; 10 Yu Yongzhang volumetric air compressor repair Beijing Machinery Industry Press. 2007;1 Xing Ziwen screw air compressor theory design and application Beijing Machinery Industry Press 2007; 7 5 Chen Guanguo machinery and equipment maintenance Beijing Machinery Industry Press 20089
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