Title:
ABNORMAL OPENING DEGREE DETECTION DEVICE AND ABNORMAL OPENING DEGREE DETECTION METHOD FOR CONTROL VALVE
Document Type and Number:
WIPO Patent Application WO/2018/230237
Kind Code:
A1
Abstract:
The present invention enables highly-accurate detection of an abnormal degree of opening of a control valve, such as a flow control valve or a pressure control valve, without the need to install or construct new instrumentation equipment. The present invention is a method for detecting an abnormal opening degree of a flow control valve on a liquid process line, wherein data is created in advance for a theoretical approximation formula derived from a command opening degree for the control valve and a flow rate of liquid relative to that command opening degree, and a theoretical flow rate value at a predetermined command opening degree found from the theoretical approximation formula is compared to an actually-measured value of the flow rate of the liquid, thereby detecting an abnormal opening degree of the control valve. Also, the present invention is a method for detecting an abnormal opening degree of a pressure control valve on a gas process line, wherein data is created in advance for a theoretical approximation formula derived from an average value of command values for an operating load in one pressure change cycle of a reaction container to which the control valve is connected as well as from a pressure change cycle duration, and a theoretical cycle duration at a command value for a predetermined operating load found from the theoretical approximation formula is compared to an actual cycle duration, thereby detecting an abnormal opening degree of the control valve.
Inventors:
NOZAKI SHIGERU (JP)
Application Number:
PCT/JP2018/018971
Publication Date:
December 20, 2018
Filing Date:
May 16, 2018
Export Citation:
Assignee:
SUMITOMO METAL MINING CO (JP)
International Classes:
G05B23/02; G05D7/06; G05D16/00
Foreign References:
| JP2005267572A | 2005-09-29 | |||
| JP2013088946A | 2013-05-13 |
Attorney, Agent or Firm:
SHOBAYASHI Masayuki et al. (JP)
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