1. Fire of natural gas compressor system
Natural gas leakage and electric sparks (open flames) from the prime mover are the key reasons for natural gas compressor fire and explosion accidents. The fire hazard of the compressor system is shown in the following aspects:
① Easy to form explosive mixture
Natural gas leaks through defective parts such as cylinder connections, suction and exhaust valves, shaft seals, flanges, welds and seals of equipment and pipelines; local corrosion and perforation of equipment, fatigue fractures or poor ventilation in the natural gas compressor cavity cause the accumulation of oil and gas; upstream-coming dirty materials or the stuck filter caused by not being cleaned up in time and especially the release cause the high-pressure natural gas to spray out. It will form an explosive gas mixture with the air. When it encounters a fire source, an explosion or fire in the space will happen.
② Source of ignition
There are ilegal operations (such as using open flames, non-explosion-proof tools), not wearing anti-static overalls and work shoes, etc. according to regulations; the natural gas compressor device not taking anti-static measures or anti-static measures being defective, etc.; explosion-proof lamps, switches, and electrical facilities being selected incorrectly or the wiring not meeting the specifications. The internal combustion engine drives the natural gas compressor but he exhaust pipe of the internal combustion engine has no heat insulation layer and no fire cover at the exit; when the exhaust pipe passes through the roof, the height of the nozzle from the roof is not enough; when the exhaust pipe passes through the side wall, the exhaust direction is towards the emission oil and gas or explosive dangerous places.
③ Extremely high temperature in the equipment
The temperature of natural gas will increase rapidly after being compressed. If the cooling system in the equipment cannot operate effectively, the viscosity of the lubricating oil will be reduced, the lubricating effect will be lost, the friction of the operating parts of the equipment will increase, and the temperature inside the equipment will be extremely high; at the same time the cooling water (coolant) polymerizes and decomposes, which may cause spontaneous combustion and cause a fire.
④ Mistaken operation
Operators may make operational errors due to psychological, physical or emotional influences. For example, before the compressor device is shipped, the air in the process is not replaced; when the compressor needs to be stopped in an emergency, the operator is too nervous to close the intake valve in time, which will also cause the over-pressure of the air supply equipment and eventually cause an explosion. In addition, if the outlet of the natural gas compressor is artificially closed or blocked by foreign objects that have not been cleaned in time, it may cause the pressure to be held down and cause a physical explosion of the natural gas compressor.
⑤ Equipment defects
Equipment defects or faults occur in various links such as design, manufacturing, installation, operation and maintenance, mainly due to poor materials and manufacturing processes. For example, the safety valve is blocked or damaged and malfunctions, and the explosion is caused by the over-pressure part which is not discharged in time; the improper operation caused by the reading error or display distortion of the pressure or temperature display instrument causes the explosion; the mechanical strength of the pressure parts of the natural gas compressor does not meet the requirements or the strength is reduced due to water turbidity, corrosive media, etc., which can cause a physical explosion under normal operating pressure.
2. Mechanical damage of natural gas compressor
The natural gas compressor coupling is exposed, causing mechanical damage.
3. Noise of natural gas compressor
In the natural gas compressor room, compressors and other high-speed running equipment produce relatively large mechanical noise; these noises are between 90-118 dB, which are strong noises. In addition to damaging to the auditory organs, noise also has adverse effects on the nervous system and cardiovascular system. Prolonged exposure to noise can cause headache, dizziness, fatigue, dizziness, loss of memory, insomnia, dreaminess, and neurasthenia. The effect on the cardiovascular system is manifested as accelerated heartbeat, arrhythmia, and affects fat metabolism, increasing cholesterol and the incidence of coronary heart disease.
4. Lubrication of natural gas compressor
Lubrication is an important guarantee for the good operation of the unit. Poor lubrication will lead to major faults, such as cross-head wearing or engine connecting rod fault due to poor lubrication. Most of the mechanical faults are caused by poor lubrication, so as long as the unit can be operated under good lubrication conditions, most faults will be avoided. In order to reduce the occurrence of faults due to lubrication, we must first control the quality of lubricating oil. So equipment lubrication is a key task of equipment management.
5. Temperature of natural gas compressor
The temperature of the lubricating oil of the engine and natural gas compressor and the temperature of the bearing of the engine and natural gas compressor are all very important factors before the unit is shipped and loaded. Especially production in winter, ensuring various temperatures properly can reduce most of the faults. For example, such as the compressor requires that the lubricating oil temperature reaches 30°C before it can be loaded, so the operator must wait until the temperature reaches 30°C before loading, otherwise it will affect the service life of the unit and even cause serious fault of the unit.
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