Polyolefin Solids Recovery System with Pressure Differential Control
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Solution Overview
Problem
The carryover of polyolefin solids in gas phase reactor overhead systems leads to fouling and plugging, resulting in unplanned shutdowns and increased maintenance costs due to the inability of existing solids recovery systems to effectively separate and return polymer fines to the reactor.
Innovation Solution
A method and system for operating a gas phase reactor that includes a solids recovery system with a separation vessel and a motive device, where the pressure of the motive fluid supply is measured and adjusted based on calculated pressure drops to ensure adequate flow and prevent fouling, utilizing a control system to manage the solids recovery process and return solids to the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional solids recovery system is used to separate polyolefin solids from overhead gas, then some solids are removed, but fouling and plugging still occur due to incomplete solids collection
Solution Approach 1:
The system incorporates a pressure differential control mechanism that continuously monitors and adjusts the motive fluid flow rate to maintain optimal pressure differential across the solids recovery system. This feedback control ensures consistent solids separation performance and prevents fouling by maintaining proper flow conditions throughout operation.
Solution Approach 2:
The invention changes the operating parameters of the solids recovery system by dynamically adjusting the motive fluid flow rate based on pressure differential measurements. This parameter adjustment optimizes the balance between solids removal efficiency and prevention of fouling, resolving the contradiction between complete solids collection and system reliability.
2Quantity of substance
If the motive fluid flow rate is increased to improve solids collection, then more solids are recovered, but pressure drop increases and system efficiency decreases
Solution Approach 1:
The system transitions from static to dynamic operation by continuously adjusting the motive fluid flow rate based on real-time pressure differential measurements. This dynamic adjustment allows the system to maintain high solids recovery efficiency while minimizing energy loss through pressure drop, as the flow rate is optimized rather than maximized.
Solution Approach 2:
The pressure differential control system serves itself by automatically adjusting the motive fluid flow rate without external intervention. The system monitors its own performance and self-regulates to maintain optimal operating conditions, balancing solids recovery with energy efficiency autonomously.
3Reliability
If a complex control system is implemented to optimize solids recovery, then fouling is reduced, but device complexity increases
Solution Approach 1:
The control system uses a straightforward feedback mechanism that monitors pressure differential and adjusts motive fluid flow rate accordingly. This simple feedback loop achieves effective fouling prevention without requiring complex control algorithms or multiple sensors, maintaining system simplicity while improving reliability.
Solution Approach 2:
The system uses pneumatic control through the motive fluid itself to adjust flow conditions and prevent fouling. By utilizing the existing gas phase fluid dynamics rather than introducing separate mechanical control systems, the invention achieves fouling prevention with minimal additional complexity.
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
This approach reduces the occurrence of fouling and plugging, minimizing downtime and maintenance costs by effectively separating and returning polymer solids, thereby maintaining continuous polyolefin production.
Implementation Method 1
a separation vessel to separate the solids from the overhead gas of the gas phase reactor
Implementation Method 2
a motive device to facilitate return of the solids to the gas phase reactor... measuring a pressure of a motive fluid supply to the solids recovery system; calculating a pressure drop in the solids recovery system
Data Source
AI summary
A system and method for a gas phase reactor to polymerize olefin into a polyolefin, and for a solids recovery system to separate solids from overhead gas discharged from the gas phase reactor and to return the solids to the gas phase reactor. A control system may perform a fluid flow calculation of the solids recovery system. The solids recovery system may employ a vertical motive device and/or horizontal motive device.