Hot water submersible pump instrument selection and control protection requirements

Hot water submersible pumps are widely used in various types of geothermal wells, hot springs and high temperature hot water lifting devices. The purpose of the control system is to monitor the operation status of the hot water submersible pump group, Whether the ancillary system is working properly, early detection of hot water submersible pump components failure, make predictive maintenance plans to reduce unplanned downtime, to avoid catastrophic accidents. Monitoring instrumentation, control and protection system settings generally meet:
(1), different types of geothermal wells, hot spring wells and high temperature hot water lifting device process operation requirements and protection of technological equipment (or other equipment within the device) requirements;
(2), the requirements of safe and efficient operation of hot water submersible pumps and the requirements of operation status monitoring;
(3), ancillary systems, such as lubricating oil stations, control and protection requirements
(4), drive system control protection requirements.
  Hot water submersible pump monitoring can be divided into online real-time monitoring [hot water submersible pump intelligent control] and off-line periodic monitoring of two categories, for small, general use, or less important in the device pump can be considered cyclical Monitoring (eg using a portable monitor). For the high investment of large pumps, you can consider setting up a more complete online monitoring system.
1), on-line monitoring instrumentation, control and protection system settings to consider the use of hot water submersible pumps, geothermal wells, hot springs and high temperature hot water lifting device in the importance of (pump caused by the loss of production), pump Failure probability, failure mode, the second hazard caused by the accident, the cost and time of the maintenance, the operating conditions, the operation mode, the operation experience and so on.
  As a general principle, the following two factors can be considered:
    ① the principle of reliability. Reliability of the first principle is: simple is reliable; so in the configuration monitoring, control and protection system, to avoid the configuration too much, not too much of the necessary instruments, if too much is not necessary to set the instrument and control, Not only can not increase the reliability of the pump group but also become the source of the accident.
    ② economic principles. The configuration of the monitoring, control and protection system takes into account the economy, such as an investment and subsequent maintenance costs. At the same time, the monitoring, control and protection of the pump should also take into account the environmental protection needs, such as the impact of leakage of the hot water submersible pump seal on the environment.
2), according to QJR hot water submersible pump type, structural characteristics, component failure mode, to determine the physical parameters to be monitored. Commonly used monitoring parameters are power monitoring, temperature monitoring (such as bearing temperature, oil temperature, shell temperature, motor stator winding temperature), corrosion monitoring, leak monitoring (such as QJR well with hot water submersible pump inlet and outlet valve leakage, mechanical seal Leakage monitoring), pressure monitoring (inlet and outlet pressure), speed monitoring, phase monitoring, well hot water submersible pump flow monitoring, bearing vibration monitoring, shaft vibration monitoring, shaft displacement monitoring, axial thrust monitoring, torque monitoring, no sealing heat Water submersible pump bearing wear monitoring, lubricating oil analysis.
3) Select the monitoring method, monitor the instrument and the installation location according to the physical parameters of the monitoring. By monitoring, recording and analyzing the physical parameters of certain parts of the hot water submersible pump, the operation status of the hot water pump is judged, controlled and protected, and the QJR hot water submersible pump maintenance plan is made according to the change trend of the recorded monitoring data