Polymer Pellet Flow Rate Measurement via Carrier Fluid Pressure
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Solution Overview
Problem
Existing polymer pellet transport systems lack accurate measurement of flow rates, leading to incomplete or inaccurate knowledge of polymer pellet flow, which affects the determination of appropriate additive amounts in extruders.
Innovation Solution
A system and process that utilize a carrier fluid flowing through a transfer line, with pressure sensors measuring differential pressure between upstream and downstream locations to determine the mass flow rate of polymer pellets, allowing for precise control of additive feeding and flow direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive mass flow devices are used to measure polymer pellet flow rate, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses carrier fluid as an intermediary medium to indirectly measure polymer pellet flow rate. Pressure sensors measure the carrier fluid pressure, which serves as a mediator to determine pellet flow rate without directly measuring the pellets themselves. This resolves the contradiction by providing accurate measurement through an intermediate substance rather than complex direct measurement devices.
Solution Approach 2:
The patent replaces expensive mechanical mass flow measurement devices with a pressure-based measurement system. By measuring carrier fluid pressure upstream and downstream of the pellet feed point, the system substitutes complex mechanical flow measurement with simpler pressure sensing, reducing device complexity while maintaining measurement precision.
2Reliability
If high system elevation is used to enable gravity-assisted pellet flow, then flow reliability is improved, but manufacturing cost and system complexity increase
Solution Approach 1:
The patent uses pneumatic principles by introducing a carrier fluid to transport polymer pellets through the transfer line. The pressurized carrier fluid replaces gravity as the driving force, eliminating the need for high system elevation structures while maintaining reliable pellet flow. This resolves the contradiction by using fluid dynamics rather than gravitational potential energy.
3Productivity
If carrier fluid flow rate is increased to improve pellet transport speed, then productivity is improved, but energy consumption and system complexity increase
Solution Approach 1:
The patent implements feedback control by measuring carrier fluid pressure upstream and downstream of the pellet feed point and using this information to determine pellet flow rate. This feedback mechanism allows the system to optimize carrier fluid flow rate, maintaining productivity while minimizing energy consumption by adjusting flow only as needed rather than continuously high flow.
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
Enables accurate determination of polymer pellet flow rates and volumes, facilitating optimal additive feeding and efficient transport, reducing the need for expensive mass flow devices and lowering system elevation and operational costs.
Implementation Method 1
measuring a first pressure value of the carrier fluid at a location in the transfer line upstream of the feed location, measuring a second pressure value of the carrier fluid and polymer pellets at a downstream location in the transfer line which is downstream of the feed location, and determining a mass flow rate of the polymer pellets flowing in the transfer line based on a differential pressure between the first pressure value and the second pressure value
Data Source
AI summary
A process is described that includes flowing a carrier fluid through a transfer line, feeding polymer pellets into the transfer line at a feed location, measuring a first pressure value of the carrier fluid at a location in the transfer line upstream of the feed location, measuring a second pressure value of the carrier fluid and polymer pellets at a downstream location in the transfer line which is downstream of the feed location, and determining a mass flow rate of the polymer pellets flowing in the transfer line based on a differential pressure between the first pressure value and the second pressure value.