PLC-based nuclear power station electric heat tracing control system and control method thereof
A technology of control system and electric heat tracing, which is applied in general control system, control/regulation system, program control in sequence/logic controller, etc. It can solve the problem of lower control accuracy of boron heat tracing system and drift of temperature switch set point , Increase the number of regular adjustments, etc., to save time and labor costs, reduce the number of equipment, and reduce the number of regular adjustments
Pending Publication Date: 2020-06-12
CHINA NUCLEAR POWER ENG CO LTD
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Problems solved by technology
Due to the characteristics of the mechanical structure of the mechanical thermostat, after a period of operation, many temperature switches have set point drift, micro switches do not operate, micro switches do not reset, etc., which not only reduces the control accuracy of the boron heat tracing system, but also Moreover, the number of regular adjustments has been increased, which brings a lot of extra work to the operation and maintenance of the site
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Embodiment
[0018] The specific technical solution provided in this embodiment is to transform the structure of the existing nuclear power plant electric heat tracing control system. By maximizing the use of the original system structure and equipment, taking into account the operability and engineering investment of the transformation, reducing system equipment, and realizing nuclear power plant Heat tracing controls for boron-containing piping and equipment.
[0019] The specific modification plan is to figure 1 The electric heat tracing control system of the original mechanical thermostat, remove the temperature bulb and meter head of the original mechanical thermostat, and the control cable termination from the thermostat meter head to the heat tracing circuit board; remove the low voltage from the alarm cabinet, power supply cabinet to the alarm cabinet Cable termination, control cable termination from the heating circuit board to the alarm cabinet; removal of the local temperature i...
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The invention relates to a PLC-based nuclear power station electric heat tracing control system and a control method thereof. The PLC-based nuclear power station electric heat tracing control system includes a normal heat tracing cable and a standby heat tracing cable which are used for conducting heat tracing on a pipeline or equipment, and a normal thermocouple and a standby thermocouple which correspond to the normal heat tracing cable and the standby heat tracing cable; the standby loop thermocouple is connected with a standby loop thermocouple collecting box, and the standby loop thermocouple collecting box is connected with a standby PLC control cabinet; the normal loop thermocouple is connected with the normal loop thermocouple acquisition box, the normal loop thermocouple acquisition box is connected with the DCS cabinet, and the DCS cabinet is connected with the normal PLC control cabinet; the standby PLC control cabinet and the normal PLC control cabinet are respectively connected with the switch cabinet, and the switch cabinet is connected with the operator station. The control performance of the system is improved, the structure of the system is simplified, the controlfunction, the display function and the alarm function of an original system are completely reserved, the number of on-site devices is greatly reduced, and therefore the number of times of regular adjustment and calibration is reduced, and a large amount of time cost and labor cost are saved for on-site operation and maintenance.
Description
technical field [0001] The invention belongs to the design technology of nuclear power plants, and in particular relates to a PLC-based nuclear power plant electric heat tracing control system and a control method thereof. Background technique [0002] There are a large number of boron-containing process pipelines in nuclear power plants. In order to maintain the normal circulation of boron solution and prevent boric acid crystallization, a boron heat tracing system must be installed to heat the pipeline system to ensure that the process medium in the pipeline system is available during normal operation or shutdown of the nuclear power plant. Keep the temperature of the process medium in the piping system, including mechanical piping, valves, pumps, filters, tanks and instrumentation, within the specified operating range. Generally, the piping system that needs heat tracing has an insulation layer. In some occasions, the process medium in the piping system needs to be heated...
Claims
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IPC IPC(8): G05B19/05G05D23/32
CPCG05B19/058G05D23/32G05B2219/163
Inventor 杨萧范遂谭悦
Owner CHINA NUCLEAR POWER ENG CO LTD