Cyclone Separator with Tangential Discharge and Offset Gas Inlet
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In fluid catalytic cracking processes, direct discharge of a mixture of solids and gaseous fluids into cyclone separators leads to instability and increased catalyst losses due to high solid loading, requiring more efficient separation methods to reduce catalyst losses and enhance process stability.
Innovation Solution
A separation apparatus comprising a cylindrical separation vessel with a tangentially oriented discharge opening for the mixture conduit, a gas recovery conduit with a radially offset inlet below the discharge opening, and an annular flange to reduce stagnant areas and facilitate tangential velocity, allowing for effective separation of solid particles from gaseous fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct discharge of high solid loading mixture into cyclone separators is used, then initial separation is achieved, but catalyst losses increase and process stability deteriorates
Solution Approach 1:
The invention divides the separation process into two distinct stages: a first cyclone separator for initial separation of high solid loading mixtures, and a second cyclone separator for final separation. This segmentation allows each cyclone to be optimized for its specific function, with the first cyclone handling high catalyst loads and the second cyclone achieving complete separation, thereby reducing overall catalyst losses while maintaining high productivity.
Solution Approach 2:
The first cyclone separator acts as an intermediary device between the reactor and the second cyclone separator. It pre-treats the high solid loading mixture by removing a portion of the catalyst, reducing the loading before the mixture enters the second cyclone. This intermediary separation protects the second cyclone from excessive catalyst loads that would cause instability and increased losses.
2Loss of substance
If large diameter cyclones are used to handle high solid loading, then catalyst losses are reduced, but device complexity and space requirements increase
Solution Approach 1:
Instead of using a single large diameter cyclone, the invention segments the separation function into two smaller cyclones. The first cyclone is designed for high solid loading conditions, and the second cyclone completes the separation. This segmentation reduces the complexity of designing and operating a single large cyclone while achieving the same or better catalyst loss reduction.
3Productivity
If pressure pulses occur in high solid loading discharge, then initial separation is maintained, but solids carryover with vapor increases
Solution Approach 1:
The first cyclone separator serves as a buffer and intermediary that dampens pressure pulses before they reach the second cyclone. By handling the high solid loading and associated pressure fluctuations in the first cyclone, the second cyclone operates under more stable conditions, reducing solids carryover with the vapor stream and improving overall process reliability.
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 apparatus improves the efficiency of solid-gas separation by reducing catalyst losses and minimizing coke formation, enhancing the overall stability and performance of the fluid catalytic cracking process.
Implementation Method 1
Cyclonic separators are well known and operate by imparting a tangential velocity to gases containing entrained solid particles that forces the heavier solid particles outwardly away from the lighter gases
Implementation Method 2
the centripetal acceleration associated with an outer vortex causes catalyst particles to migrate towards the outside of the barrel
Implementation Method 3
A gas recovery conduit within the vessel has an inlet and an intermediate portion. The inlet is for withdrawing gaseous fluids from within the open interior of the separation vessel at a location below the discharge opening and is radially offset from the mixture conduit.
Data Source
AI summary
An apparatus for separating solid particles from a stream of a mixture of gaseous fluids and solid particles has a separation vessel. A mixture conduit extends vertically into a central section of the separation vessel and defines a discharge opening located within the vessel and tangentially oriented for discharging the stream into an open interior of the vessel and imparting a tangential velocity to the stream. A gas recovery conduit within the separation vessel has an inlet for withdrawing gaseous fluids from within the open interior of the separation vessel at a location below the discharge opening and radially offset from the mixture conduit. An intermediate portion of the gas recovery conduit is located above the inlet within the separation vessel and has a diameter greater than a diameter of the inlet.