Closed Relief System for Polyolefin Loop Reactors
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Solution Overview
Problem
Existing polyolefin loop reactor systems often lack effective pressure relief mechanisms, leading to potential hazards and inefficiencies, particularly in containing solids during relief scenarios without plugging the flare system.
Innovation Solution
A closed reactor relief system (CRRS) is implemented, featuring a dedicated cyclone vessel and relief instrument system to separate slurry components during relief events, preventing direct atmospheric discharge and reducing the likelihood of reactor fouling through interlock functions and controlled pressure management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a traditional open relief system is used, then the structure is simple, but solids can enter the flare system causing plugging and hazards
Solution Approach 1:
A cyclone separator is introduced as an intermediary device between the relief valve and the flare system. This cyclone separator captures solids from the relief discharge before they can enter the flare system, preventing plugging while maintaining system functionality. The cyclone acts as a mediator that separates the harmful solids from the gas stream without requiring complete system redesign.
Solution Approach 2:
The relief system is segmented into distinct functional zones: a relief valve section, a cyclone separator section, and a flare section. This segmentation allows each component to perform its specific function optimally - the relief valve handles pressure relief, the cyclone separates solids, and the flare processes the gas - while preventing solids from traveling between sections.
2Reliability
If pressure relief capacity is increased, then safety is improved, but the size of relief valves and vessels increases
Solution Approach 1:
The cyclone separator serves as a mediator that protects downstream flare equipment from solids, allowing the use of appropriately sized relief valves without excessive oversizing. By placing the cyclone in the flow path, the system can maintain effective pressure relief capacity while preventing solids from causing blockages that would require larger safety margins in component sizing.
3Object-affected harmful factors
If direct atmospheric discharge is used, then the system is simple, but reactor fouling and upset conditions are more likely
Solution Approach 1:
The cyclone separator acts as an intermediary that prevents solids from reaching the flare system and potentially causing reactor fouling or upset conditions. By capturing solids in the cyclone before discharge, the system maintains simpler operation compared to more complex filtration or separation systems while still preventing harmful effects.
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 CRRS effectively contains pressure relief discharges, minimizes the risk of reactor fouling, and optimizes relief valve and vessel sizing, enhancing safety and operational efficiency by preventing solids from entering the flare system and reducing the probability of upset conditions.
Implementation Method 1
A dedicated cyclone vessel and relief instrument system to separate slurry components during relief events
Data Source
AI summary
A reactor system including an enclosed pressure relief system and/or a control system. The enclosed pressure relief system including a slurry separation system communicatively coupled with a pressure relief valve coupled to a loop reactor such that activation of the pressure relief valve results in discharge of a slurry from the loop reactor to the slurry separation system, wherein the slurry separation system is capable of separating solid and liquid components from gas components of the slurry and transmitting the gas components to a flare via a flare header.