【Q&A Question 177】2017.06.26
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This post was last edited by 955559 on 2017-7-21 23:05. [Q&A Question 177] June 26, 2017: What are the main parameters of a reciprocating compressor? The reference answers can be seen after responding; points will be awarded for identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Note: For questions of the type \"one question per day,\" if a person replies continuously for a month, that is, posts more than 30 times, their score will be assigned as 2 points, which is the lowest possible score. Click once to reply; if multiple replies are made, points will be awarded as appropriate, as deleting posts is also a waste of time. 1. Rotational speed 2. Stroke 3. Average piston speed 4. Pressure 5. Displacement 6. Piston force. Scoring criteria: Incorrect answers earn 2 wealth points; *incomplete* answers earn 3–8 points. Correct answers with a detailed explanation earn 10 wealth points, while correct answers with insufficient additional details earn 15–20 wealth points. Please score according to these criteria. Note: If there are editing records after answering, only points will be awarded to those who participated. For continuous malicious spamming, 2 points will be deducted each time, with no upper limit. Pure numbers, pure emojis, or random letters that have nothing to do with the answer are all considered malicious spamming; points will start to be deducted after three warnings. 2017 Q&A Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updating now) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (fully updated) http://bbs.hcbbs.com/thread-1597792-1-1.html
1. Displacement. The displacement of a reciprocating compressor generally refers to the volume of gas discharged by the last stage of the compressor per unit of time, expressed in terms of the pressure and temperature at the inlet of the first stage. The common units for measuring displacement are m3/min or m3/h. The rated discharge volume of a compressor (the discharge volume indicated on the compressor’s nameplate) refers to the discharge volume under specific inlet conditions. 2. Exhaust pressure. The discharge pressure of a reciprocating compressor generally refers to the pressure of the gas that is finally discharged from the compressor. It should be measured at the outlet pipe of the last stage of the compressor, with MPa being the common unit of measurement. The discharge pressure of a compressor is not fixed; the discharge pressure indicated on the compressor’s nameplate refers to the rated discharge pressure. In reality, the compressor can operate at any pressure below the rated value, and it can also operate at pressures higher than the rated value as long as the strength and discharge temperature allow it. 3. Rotational speed. The rotational speed of the crankshaft in a reciprocating compressor is commonly expressed in r/min, and it represents a key structural parameter of such compressors. 4. Piston force. The piston force is the resultant of the gas force and the reciprocating inertial force at any rotation angle of the crankshaft; it acts on the piston rod or piston pin. 5. Piston stroke. During operation, the distance that the piston travels from one end stop to the other is called a stroke, with the common unit being m (meter). 6. Power. The work consumed by a reciprocating compressor is used in part to compress the gas, and this is known as indicated work; the other part is used to overcome mechanical friction, and this is called frictional work. The total work required by the main shaft is the sum of these two, and it is referred to as shaft work. The work consumed per unit of time is called power, with common units being watts (W) or kilowatts (kW). The shaft power of a compressor is the sum of the indicated power and the frictional power.
Intake pressure, exhaust pressure, intake temperature, exhaust temperature, filter pressure drop, motor bearing temperature, stator temperature, motor current, lubricating oil temperature, lubricating oil pressure, cooling water temperature, compressor bearing temperature
I misread the question; I thought it was referring to operating parameters
Inlet pressure Outlet pressure Inlet temperature Outlet temperature
Inlet pressure Outlet pressure Inlet temperature Outlet temperature
Inlet pressure Outlet pressure Inlet temperature Outlet temperature Lubricant oil temperature Lubricant oil pressure Cooling water pressure
1. Displacement 2. Exhaust pressure 3. Rotational speed 4. Piston force 5. Piston stroke 6. Power
Inlet and outlet pressures, pressure ratio, lubricating oil temperature, cooling water temperature, unit vibration, return valve opening degree, current, etc
1. Displacement. The displacement of a reciprocating compressor generally refers to the volume of gas discharged by the last stage of the compressor per unit of time, expressed in terms of the pressure and temperature at the inlet of the first stage. The common units for measuring displacement are m3/min or m3/h. The rated discharge volume of a compressor (the discharge volume indicated on the compressor’s nameplate) refers to the discharge volume under specific inlet conditions. 2. Exhaust pressure. The discharge pressure of a reciprocating compressor generally refers to the pressure of the gas that is finally discharged from the compressor. It should be measured at the outlet pipe of the last stage of the compressor, with MPa being the common unit of measurement. The discharge pressure of a compressor is not fixed; the discharge pressure indicated on the compressor’s nameplate refers to the rated discharge pressure. In reality, the compressor can operate at any pressure below the rated value, and it can also operate at pressures higher than the rated value as long as the strength and discharge temperature allow it. 3. Rotational speed. The rotational speed of the crankshaft in a reciprocating compressor is commonly expressed in r/min, and it represents a key structural parameter of such compressors. 4. Piston force. The piston force is the resultant of the gas force and the reciprocating inertial force at any rotation angle of the crankshaft; it acts on the piston rod or piston pin. 5. Piston stroke. During operation, the distance that the piston travels from one end stop to the other is called a stroke, with the common unit being m (meter). 6. Power. The work consumed by a reciprocating compressor is used in part to compress the gas, and this is known as indicated work; the other part is used to overcome mechanical friction, and this is called frictional work. The total work required by the main shaft is the sum of these two, and it is referred to as shaft work. The work consumed per unit of time is called power, with common units being watts (W) or kilowatts (kW). The shaft power of a compressor is the sum of the indicated power and the frictional power.