Methods for large reciprocating compressor capacity control: A review based on pulse signal concept |
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Authors: | ZhaoLin Gu XiongPo Hou ZanShe Wang ShiYu Feng XiuFeng Gao Yun Li |
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Institution: | 1 School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China; 2 School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China; 3 College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract: | Large reciprocating compressors are important equipment used in a wide range of process industries. Most of these compressors
have huge power requirements and their capacity often needs to be regulated. Advanced technologies in compressor capacity
control are effective approaches for saving large amounts of energy in process industries. This paper reviews the basic theories
and the state of the art of the capacity control technologies. In particular, a compressor working procedure is first presented
using an analogy to the pulse signal concept. Compressor capacity control methods are classified into pulse frequency modulation
and pulse amplitude modulation from a perspective of pulse signal processing. The mechanisms and feasibility of some important
methods, including dead volume variable control, partial-stroke and full-stroke suction valve opening, are reviewed. Based
on the pulse signal concept, a duty cycle regulation method for capacity control is introduced, and the performance and implementation
of the new method are compared with those of the existing suction valve opening methods. The duty cycle regulation method
has integrated advantages over the other methods in terms of regulating precision, pressure stability, energy saving and reliability.
All the suction valve opening methods can cause gas reflux, resulting in the so-called breathing effect. The breathing effect
has negative effects on regulation performance and compressor security, which needs further investigation in the future. |
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Keywords: | reciprocating compressor capacity control suction valve opening duty cycle regulation |
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