Science and technology information air pressure hollowing out and fig cans () causes of rape and fat treatment Tang Shuzhi, Meihe Coal Mine, Hongmei Town, Meihekou City, Jilin Province This paper introduces the role of wind bag in air compressor and analyzes air pressure. The direct and indirect causes of the blast package explosion proposed feasible preventive measures. Air Compressor Air Bag Explosion Cause Air Compressor is an energy conversion device that converts electrical energy into pressure energy. The compressed air produced by it can drive the wind drill, wind pick, rock drill, pneumatic rock loader and concrete used by the mine. Air-driven equipment such as jets. In addition, pneumatic gates in auxiliary production, forging machines and air hammers in machining equipment are also powered by air compressors. As a large-scale fixed equipment for coal mines, air compressors have always played an indispensable role in the development of coal mines at home and abroad. However, in the history of coal mining, accidents involving air compressor explosions are common occurrences, such as the occurrence of a 2-stage cylinder exhaust valve and a 2-stage piston explosion in a mine in Shanxi. Other coal mines in the country have also exploded, for example, cylinders. Accidents such as pipeline explosions and wind-blown explosions.

1. The air storage tank (commonly known as wind bag) plays a role in the air compressor. The air storage tank (hereinafter referred to as the wind pack) is a closed container located between the air compressor main unit and the pipe network. The amount of compressed air, one is to stabilize the periodic pulsed airflow discharged by the air compressor to ensure a smooth supply of air; the second is to separate the oil and water in the compressed air. Wind bags are generally welded by steel plates and are divided into horizontal and vertical.

2. There are many reasons for the explosion of wind-bag explosion caused by air-bag explosion. The comprehensive analysis can be summarized into two categories: direct cause and indirect cause. The direct causes are overpressure and over-temperature; the indirect causes are wind-bag design and manufacturing defects, fatigue aging, etc. The direct cause of D 2.1 wind-bag explosion is that the rated pressure of the air compressor wind bag is generally the current. 8MPa, the pressure greater than this rating, called overpressure. The gas pressure in the wind bag is determined by the pressure regulator and the safety valve. Once the two problems occur at the same time, the gas pressure in the wind bag rises sharply, exceeding the strength limit of the wind bag, which will lead to an explosion accident; In the event of failure, the wind-blown explosion caused by man-made pressure regulator operation errors, although not many, occasionally occurs. During normal adjustment, the pressure regulator's handle adjustment device causes the spring to be gradually compressed until the air pressure rises to the rated value. 8MPa; if the driver or maintenance worker operates the opposite, the spring is at the compression limit at the beginning, and the locking value has already exceeded 0.8MPa. After the start-up, the gas pressure rises sharply in a short time until the load is full, and then the load is overloaded. Failure, the safety valve fails, so that the gas pressure in the wind bag is up to IMPa, which is easy to cause the wind bag to explode more. The parts of the unloading valve in the pressure regulator are faulty, and the automatic unloading cannot be realized when the system is overpressured. The pressure is reduced, and the pressure gauge fails and the safety valve fails. The gas pressure in the wind bag is as high as IMPa or more, and it is easy to cause the wind bag to explode.

There are two types of explosions caused by over-temperature air compressor air bags. One is a coke combustion explosion, and the other is a lubricating oil and its oil and gas combustion explosion. The cylinder lubrication of mining air compressors is generally lubricated with thin oil of No. 13 compressor oil. Some oil molecules will be carried into the pipeline and wind package by compressed air to form oil and gas. It takes a long time to self-liquefy and deposit in the wind. In the lower part of the bag, drivers and maintenance workers are required to regularly discharge oil and water exhaust valves according to regulations. If the driver is not operating properly, or the exhaust valve is not flexible, not in place, and the pipe is not smooth, it is easy to cause excessive oil and oil concentration. The exhaust temperature of the air compressor is often close to 190 ° C. Once the system is overheated for some reason, the engine flash point is reached, and the oil and oil in the wind bag will immediately burn and explode. In addition, in the cylinder, the exhaust pipe, the valve, and the wind bag of the air compressor, a part of the lubricating oil accompanying the air flow is oxidized by the hot air to form a carbide. The worse the oil quality, the greater the oil supply, the worse the air filtration, the higher the temperature, and the more carbides are formed. This kind of carbide is composed of a mixture of solid oxygen, hydrocarbons and impurities. It is attached to the cylinder, exhaust pipe, valve and wind wall. It is called carbon deposit and is flammable. If there is no regular cleaning, when the secondary exhaust gas temperature of the air compressor is too high, the ambient temperature is too high, the spark is generated by electrostatic discharge, the impact spark is generated when the carbon particles are moving, and the carbon deposit reaches one of the autoignition temperature conditions, it may be Causes burning and explosion.

2.2 Indirect Causes of Wind-Bag Explosion 2.2.1 Wind-Bag Design and Manufacturing Defects If the wind package is unqualified at the factory, or the material is improperly selected, or there are local defects, or improper storage, etc., the mechanical strength of the wind-bag will be reduced. Design standard requirements. Even if the wind bag is working at rated pressure, it will still explode; it will be more explosive when overpressured.

The reciprocating air compressor has intermittent process of suction and exhaust. The pressure and velocity of the airflow in the pipeline are pulsating cyclically changing. The gas pressure is large and small, and the airflow speed is fast and slow. When the pulsating air flows through the pipe bends, valves or reducers, it also causes the pipe to vibrate. The more uneven the pulsating pressure, the higher the pressure, the larger the diameter of the pipe, the greater the exciting force and the greater the vibration; when the pulsating airflow causes the frequency of the pipe vibration to be the same or similar to the natural frequency of the pipe structure system, it will also cause Resonance, vibration will be stronger. The result of the system vibration is that the joint components between the various links are subjected to repeated vibration stresses, so that the system including the wind bag is subjected to additional fatigue load, so that looseness, cracking, etc. occur, and leakage occurs, and the explosion is caused by .

3, measures to prevent air compressor air package explosion Wind pack is an important pressure vessel, to prevent wind-blown explosion not only to prescribe the right medicine, but also to start from the source, strict control.

3.1 Measures to prevent windbreaker defects (1) Strictly close the order. Before ordering, it is necessary to check the valid qualification documents of the air compressor and wind bag manufacturer, such as "Production Manufacturing License", "Coal Mine Safety Sign Permit", "Quality Certification", "Product Acceptance Certificate", " Installation Qualifications and relevant documents for special requirements for pressure vessels in the country. After the confirmation is correct, the ordering technical agreement can be signed, and then the formal contract is signed according to the requirements of the technical agreement. Before leaving the factory, we must send technical experts to participate in the factory test, strict acceptance, to ensure product quality.

(2) Strictly shut down transportation. Prevent the wind bag from bumping and scratching during transportation.

(3) Strictly install the equipment. Before installation, be sure to check the surface of the wind bag for damage. After confirming that there is no problem, please allow careful installation according to the national installation regulations for pressure vessels. The newly installed wind kit must also be tested.

(4) Strictly overhaul and reform. The overhaul and renovation of the wind bag must be carried out in accordance with the management method of the pressure vessel, and only the unit holding the permit can proceed. After the overhaul or renovation, the wind bag must be tested and the test can only be used.

(1) Strictly implement the regular training system, assessment system, certification system and safe operation procedures for drivers and maintenance workers to ensure the correct operation of the staff.

(2) The pressure regulator is the key inspection object for overpressure, and it is guaranteed to be in good condition.

(3) Take the safety valve as the key inspection object for overpressure and ensure it is in good condition.

(4) Use the pressure gauge as the key inspection object for overpressure and ensure it is in good condition.

(1) Correctly select qualified laboratory units, strictly select compressor oil and mechanical oil, and oils with unqualified indicators cannot be used. First, we must ensure that the flash point of the compressor oil is not lower than 215 °C. Second, we must ensure that the friction is not increased due to excessive ash and mechanical impurities, and the temperature of the system is increased. Third, the oil quality should be improved, the carbon deposit should be reduced, and the amount of combustible materials should be reduced.

(2) Use the air filter as the key inspection object for over-temperature to ensure clean air intake.

(3) The cooling water pump is used as the key inspection object for over-temperature, and the scale of the snake tube is often inspected and cleaned to ensure that the cooling effect is normal, so that the outlet water temperature is lower than 40 ° C. (4) The cool water pool is used as the key inspection object for over-temperature, ensuring The equipment is in good condition and the water supply is sufficient.

(5) The wind-covered pergola is the key inspection object for over-temperature, ensuring that the wind bag is not exposed to the sun and is well ventilated.

(6) All kinds of thermometers should be used as the key inspection objects for over-temperature, ensuring that they are intact.

3.4 Reliable automatic monitoring and monitoring The protection and alarm device system can realize automatic power-off and shutdown when over-pressure and over-temperature. When an important parameter exceeds the standard, automatic alarm can be realized.

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