Pressurizer Water Level Control Using Variable-Speed Charging Pump
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Solution Overview
Problem
The existing pressurizer water level control systems in pressurized water reactors are complex, requiring multiple actuating mechanisms and occupying significant space, with complicated control logic.
Innovation Solution
A pressurizer water level control system utilizing a charging pump with adjustable rotational speeds, controlled by a temperature-based water level setting and deviation range, simplifying the control logic and reducing the number of actuating mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional water level control methods using charge valves, discharge valves, and pump switching are employed, then water level control can be achieved, but the control logic becomes complicated and the number of actuating mechanisms increases
Solution Approach 1:
The invention extracts and eliminates unnecessary actuating mechanisms (charge valves, discharge valves, and their control systems) from the traditional water level control system. By using only the charging pump with variable speed control, the system removes complex valve mechanisms while maintaining effective water level control through single-point actuation.
Solution Approach 2:
The charging pump is given multiple functions: it not only charges the pressurizer but also controls water level by varying its speed. This multi-functional approach replaces the need for separate charge valves, discharge valves, and pump switching mechanisms, simplifying the overall control system while maintaining control reliability.
2Adaptability or versatility
If multiple actuating mechanisms (charge valves, discharge valves, pumps) are used for water level control, then control flexibility is improved, but the equipment occupies larger space
Solution Approach 1:
The invention merges the functions of charge valves, discharge valves, and pump control into a single variable-speed charging pump system. This consolidation reduces the number of separate components and their associated piping, thereby reducing equipment space while maintaining control flexibility through speed variation.
Solution Approach 2:
The charging pump serves multiple purposes: water level control, pressure regulation, and system charging. This universal application of a single device eliminates the need for multiple specialized components, reducing overall equipment footprint while preserving adaptability.
3Adaptability or versatility
If traditional control modes with multiple valves and pumps are used, then water level adjustment range is improved, but the number of actuating mechanisms increases
Solution Approach 1:
The invention introduces dynamic speed control of the charging pump to replace static on/off control of multiple valves and pumps. By continuously varying the pump speed, the system achieves a wide water level adjustment range while using only one actuating mechanism, eliminating the need for multiple discrete control elements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system ensures accurate water level regulation with reduced equipment complexity and frequency of actuator use, optimizing space utilization and control accuracy.
Implementation Method 1
The temperature measuring module respectively measures the temperatures of the cold leg and the hot leg of the primary loop system, and obtains an average temperature of the primary loop system
Implementation Method 2
The water level measuring device detects a real-time water level value of the pressurizer
Implementation Method 3
The charging pump is provided in the charging channel to supply water to the primary loop system, and the charging pump controls the water supply speed according to the control command
Data Source
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AI summary
A water level control system of a pressue regulator of a pressurized water reactor comprises a heat exchanger, a one-loop system, a temperature measurement module, a water level setting value generation module, a pressure regulator, a water level measurement apparatus, a rotational speed control module and an upper filling pump. The heat exchanger is communicated with the one-loopp system by means of an upper filling channel (l) and a lower discharge channel (2), respectively. The temperature measurement module respectively measures the temperature of a cold pipe section (3) and a hot pipe section (4) of the one-loop system and obtains the average temperature of the one-loop system. The temperature measurement module is in communication connection with the water level setting value generation module, and the water level setting value generation module, according to the average temperature, generates a water level setting value of the pressure regulator, The water level measurement apparatus measures the real-time water level value of the pressure regulator, The rotational speed control module, according to the water level setting value and the real-time water level value, generates a control command for controlling the rotational speed of the upper filling pump (5). The upper filling pump (5) is arranged in the upper filing channel, so as to supply water to the one-loop system, and the upper filling pump (5) controls the water supply speed according to the control command, such that adjustment precision can be ensured while frequent actions of an actuating mechanism are avoided.