Quench Water Separator Calming Baffle for Coke Separation
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Solution Overview
Problem
Conventional quench water separators face challenges in handling large quantities of coke/tar, leading to high pressure drops and increased fouling, which affects the separation efficiency and furnace run length in steam cracker quench systems.
Innovation Solution
The implementation of a calming baffle in the quench water separator, extending from one end of the shell to a perforated baffle that covers at least a third of the internal cross-sectional area, reduces eddies and aids in the settlement of pytar/coke material, separate from the fluid flow, enhancing the separation of coke/tar from water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional quench water separators are used without calming baffles, then the structure is simple, but the separation efficiency is poor and fouling is high
Solution Approach 1:
The separator is divided into multiple functional compartments using baffles: a feed compartment, a separation compartment, and a settled material compartment. The baffle creates distinct zones for different separation functions, improving overall separation efficiency by organizing the complex separation process into manageable segments.
Solution Approach 2:
The baffle acts as an intermediary structure between the feed stream and the settled material collection area. It mediates the flow transition, creating a calm zone that facilitates effective separation while preventing direct mixing between incoming feed and settled materials.
2Productivity
If high velocity feed is introduced directly into the separator, then the processing speed is high, but eddies are formed and separation efficiency decreases
Solution Approach 1:
The baffle is positioned to intercept the high-velocity feed stream before it enters the main separation zone. It preliminarily reduces the flow velocity and dissipates eddies in advance, creating a calm feed condition that enables effective separation in the downstream compartment without sacrificing overall processing throughput.
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 design improves oil/water separation, minimizes pytar/coke fouling, and increases the residence time of particles, leading to more efficient separation and reduced re-entrainment of settled materials, thereby optimizing the performance of quench water separators.
Implementation Method 1
The feed calming compartment is adapted to receive feed flowing into the quench water separator and reduce eddies in the feed
Implementation Method 2
aid in the settlement of pytar/coke material
Data Source
AI summary
Systems and methods of removing coke/tar from water in a quench water recycling loop of a steam cracker quench system are disclosed. The systems include a quench water separator that has a feed calming compartment for reducing eddies in feed to the quench water separator. The feed calming compartment is defined, at least in part, by a perforated baffle in the quench water separator. The methods include the use of the quench water separator with the perforated baffle and the calming compartment to separate coke/tar from quench water in the quench water recycling loop.