Problems with compression by piston compressors
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I have a setup equipped with a set of piston compressors for compressing ammonia; it features two-stage cylinders that compress the ammonia into liquid ammonia. After passing through the first cylinder of the compressor, is ammonia in a liquid or gaseous state? The equipment operator said that piston compressors are most sensitive to the presence of liquid; if liquid is present, it can damage the piston. So after passing through the second stage of compression, isn’t ammonia in a liquid state inside the second cylinder? Won’t this cause damage to the cylinder? I don’t quite understand; please explain, extra points appreciated
First, it’s important to understand why piston engines are reluctant to compress liquids Because the compressibility of liquids is very low, it leads to liquid-liquid compression in piston compressors. The equipment on your end is a piston compressor with two cylinders. The intake valve of the cylinder is usually a solenoid valve. If one cylinder is loaded, it operates at 50%, and if both cylinders are loaded simultaneously, it operates at 100%. When the two cylinders operate simultaneously, it is not the case that one cylinder continues to compress while the other one has already completed its compression ； It is two piston cylinders that compress simultaneously, and then discharge (expel) the high-temperature, high-pressure liquid ammonia (with some ammonia gas possibly present as well). If it is for cooling, there are usually air-cooled radiators or water-cooled systems using ammonia as a coolant; this fluid then enters an oil separator (which may not be present in some systems) to separate the oil from the ammonia, thereby preventing oil from entering the system. Then it is expanded and cooled through a throttle valve. Different systems may have different controls and equipment. But it’s generally the same. I hope this helps you.
Under normal conditions, as the temperature of the compressed gas rises, the gas remains in a gaseous state at high temperatures; however, after being discharged from the cylinder and cooled by a cooler, its temperature drops and the gas then turns into a liquid state
It must be a gas that is compressed; it should turn into a liquid after coming out. Reciprocating compressors do not allow the presence of liquid
It is still necessary to consider the entire process – what are the compressor exhaust pressure and exhaust temperature? By avoiding the pressure and temperature at which ammonia liquefies, what is compressed must be a gas; there’s no doubt about that.
There’s no doubt about this: liquids are incompressible. If it keeps functioning properly, it proves that what all the sea friends said is absolutely correct!
There’s no doubt about this: liquids are incompressible. If it keeps functioning properly, it proves that what all the sea friends said is absolutely correct!
You must be referring to the ammonia cycle machine, which has a two-cylinder design. You can understand it by considering the properties of ammonia: gaseous ammonia exists in the second cylinder in a gaseous state, not a liquid state
Does the secondary outlet become liquid only after heat is extracted?