[Q&A Question 002] 2017.01.02
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This post was last edited by 955559 on 2017-7-21 at 13:28. [Q&A Question 002] 2017.01.02: Why do reciprocating compressors in hydrogenation units use multi-stage compression? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 1. Improve efficiency ； 2. Reduce exhaust temperature ； 3. Reduce the force on the piston rod ； 4. Increase the volume coefficient. 2017 Q&A Summary Thread (updates have started) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have started) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Xinchang Cup – 2016 Haichuan Top 10 Selection – Please recommend candidates http://bbs.hcbbs.com/thread-1654112-1-1.html Third Round of Haichuan Outstanding Management Members Selection http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: Haichuan Chemical Forum)
The compression ratio of a single-stage compressor is too high; the high temperatures impose excessive requirements on the materials used
High pressure is required, and the exhaust temperature after primary compression is high
Meets the process pressure requirements! Inter-stage cooling is used to prevent excessive temperatures and protect the equipment.
The function of a hydrogen compressor is to pressurize the raw hydrogen gas and feed it into the reaction system. Such compressors typically have a large pressure difference between the inlet and outlet, and a relatively low flow rate; reciprocating compressors are commonly used for this purpose. The compression ratio per stage of a reciprocating compressor is generally 2–3.5; depending on the pressure of the hydrogen source and the pressure in the reaction system, 2 to 3 compression stages are usually used. Most components of a reciprocating compressor are components that move back and forth, and the airflow is pulsatory; as a result, reciprocating compressors cannot operate for long periods of time, and spare units are usually provided. Reciprocating compressors are generally driven by electric motors, connected through rigid couplings. The motors have high power but low speed, and synchronous motors are commonly used.