Ultrapure Water Circulation Pressure Control for Stable Flow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ultrapure water systems face challenges in maintaining consistent flow rates and pressures due to long supply and return pipes, leading to fluctuations that can affect water quality and production yield, especially in large-scale systems with multiple devices, and existing control systems are complex and prone to instability.
Innovation Solution
A liquid circulating system with a supply pipe and return pipe structure that includes pressure and flow rate detectors, regulating valves, and pump controls to stabilize flow rates and pressures, using booster pumps and multiple ion exchange resin treatment sections for maintenance without disrupting operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the supply pipe and return pipe are made long to serve large-scale facilities, then the coverage area is improved, but the pressure loss increases
Solution Approach 1:
The system divides the water supply into multiple circulation paths with separate control. Each path has its own flow rate detector and pump control section, allowing independent optimization of flow rates for different segments of the distribution network, thereby reducing overall pressure loss while maintaining wide coverage.
Solution Approach 2:
The pump rotational frequencies are dynamically adjusted based on real-time flow rate measurements. The pump control sections vary the rotational frequency of each pump according to the detected flow rate, enabling the system to adapt to changing demands and minimize pressure losses in long pipelines.
2Productivity
If the flow rate is increased to meet varying usage demands, then the productivity is improved, but the pressure fluctuation increases
Solution Approach 1:
Flow rate detectors continuously monitor the actual flow rates, and this information is fed back to the pump control sections. The control sections adjust pump rotational frequencies based on this feedback to maintain stable pressure despite variations in water usage demands, resolving the contradiction between productivity and pressure stability.
Solution Approach 2:
The system changes the operational parameters (rotational frequencies) of the pumps dynamically. By adjusting the rotational frequencies of individual pumps based on detected flow rates, the system can increase overall productivity while maintaining stable pressure through parameter optimization.
3Measurement precision
If multiple flowmeters are installed to measure flow rates at multiple water feed lines, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The system merges the measurement and control functions. Instead of using multiple independent flowmeters for each water feed line, the invention uses flow rate detectors combined with centralized pump control sections that can regulate multiple paths based on aggregated flow rate information, reducing the total number of measuring devices while maintaining measurement precision.
4Stability of the object's composition
If a complex control system is used to regulate return pressure based on flow rate, then the pressure stability is improved, but the ease of operation deteriorates
Solution Approach 1:
The pump control sections automatically adjust pump rotational frequencies based on flow rate detector readings without requiring complex external control systems. Each control section independently manages its associated pump based on local flow rate measurements, enabling the system to maintain pressure stability through self-regulating mechanisms rather than complex centralized control.
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 effectively suppresses flow rate fluctuations, maintains stable pressure, and minimizes water quality deterioration, ensuring consistent operation even with varying usage and maintenance needs.
Implementation Method 1
a circulation pump that causes primary pure water within the pure water tank to flow
Implementation Method 2
a pressure regulating valve provided at the return pipe, and reducing pressure within the return pipe
Implementation Method 3
a flow rate meter measuring a flow rate within the return pipe
Implementation Method 4
controls a rotational frequency of the circulation pump on the basis of the detected flow rate such that a pressure within the supply pipe becomes a predetermined value
Data Source
AI summary
A liquid circulating system has: a circulation path having a supply pipe that supplies liquid within a tank via plural treatment sections to a point of use, and a return pipe that returns liquid from the point of use to the tank; a first pump provided at the supply pipe in the midst of the plural treatment sections; a pressure detecting section provided at the return pipe; a regulating valve provided at the return pipe at a downstream side of the pressure detecting section, and regulating pressure of an interior of the return pipe in accordance with pressure detected by the pressure detecting section; a flow rate detecting section provided at the supply pipe between the point of use and a treatment section that is furthest downstream, and detecting a flow rate of liquid at an interior of the supply pipe; and a first pump controlling section that, in accordance with the flow rate detected by the flow rate detecting section, controls the first pump such that liquid flowing in the supply pipe becomes a predetermined flow rate.