Insufficient exhaust is one of the faults that are prone to occur in LNG filling equipment. What are the main reasons for its occurrence? The following Xiaobian to say the specific situation.
1. Intake filter fault: scale inhibition, reduce displacement; Inhalation pipe is too long, pipe diameter is too small, increase suction resistance, affect air volume, clean the filter regularly.
2 displacement compressor speed is reduced, so that reduce: air compressor improper use of air compressor displacement is at a certain height, compressor inlet temperature and humidity design, when it exceeds the standard used in the plateau, and reduce the suction pressure, displacement is inevitably reduced.
3. The cylinder, piston and piston ring are seriously worn and out of tolerance, which increases the corresponding clearance and leakage and affects the exhaust volume. When normal wear and tear, the piston ring and other wearing parts should be replaced in time. If the installation is not correct and the clearance is not appropriate, it should be corrected according to the drawing. If no drawings are available, empirical data can be obtained. For the clearance between the piston and the cylinder along the circumference, if it is a cast iron piston, the clearance value is 0.06/100-0.09/100 of the cylinder diameter; For aluminum alloy pistons, the clearance value is 0.12/100-0.18/100 of air diameter; For steel pistons, you can take a smaller value of the aluminum alloy pistons.
4. The packing box is not tight and the air leakage is reduced. The reason is that the packing box itself is not manufactured without packing box; Secondly, because the piston rod and packing box do not work properly during the installation process, leakage is caused by wear and strain, lubricating oil is usually filled in the packing box, can play the role of lubrication, sealing and cooling.
5. Displacement affected by failure of suction and exhaust valves of the compressor. Shards of metal or other debris fall between the seat and valve, resulting in loose closure and leakage. This affects not only the displacement but also the level change between pressure and temperature; The problem may be due to a manufacturing quality problem, such as the warp valve, where the second seat and disc form a leak due to severe wear.
6. The spring force of the air valve does not match the air force. Too much elastic force will slow the opening of the valve plate, too small elastic force will make the closure of the valve plate delay, which will not only affect the air volume, but also affect the increase of power, will also affect the life of the valve plate and the valve spring. At the same time, it also affects the change of gas pressure and temperature.
7. The compression force of the compression valve is not appropriate. If the pressure is low, the bonnet will be deformed and damaged. The general pressure strength can be calculated by the following formula: P=k1/4 dp2.D is the diameter of the valve cavity, P2 is atmospheric pressure, and K is greater than 1. Generally 1.5~2.5.K=1.5~2.0. Under high pressure, K=1.5~2.5. The practice proves that this method is a better method. The valve is faulty, the bonnet must be heated, the pressure is not normal.
The above is the reason for the insufficient exhaust capacity of LNG filling equipment summarized by Xiaobian. If you have other questions about LNG filling equipment, please continue to pay attention to us.