Fluidized Bed Polymerization Reactor With Vortex-Forming Inlet Nozzle
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Solution Overview
Problem
Conventional fluidized bed polymerization reactors face limitations in increasing production rate and frequency of contact between catalyst and reactants, leading to reduced production per unit volume and increased maintenance and operating costs, with existing methods causing drastic changes in reaction conditions and additional investment costs.
Innovation Solution
A fluidized bed polymerization reactor design featuring a plenum, distribution plate, and inlet nozzle with specific geometric configurations, including an acute angle of less than 90° and a distance of 100 mm or more between the dispersion plate and inlet nozzle, promoting a vortex phenomenon to enhance catalyst and reactant contact and facilitate efficient removal of residual particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fluidized bed polymerization reactor design is used, then heat transfer properties and temperature uniformity are improved, but production rate and catalyst-reactant contact frequency are limited
Solution Approach 1:
The reactor is divided into distinct functional zones: a plenum chamber for gas distribution, a fluidized bed reaction zone, and a cyclone separator. The distribution plate with multiple holes segments the gas flow into numerous small streams, enhancing mixing and contact between catalyst and reactants while maintaining temperature uniformity through distributed injection points
Solution Approach 2:
A cyclone separator is introduced as an intermediary device between the fluidized bed and the discharge system. This cyclone uses centrifugal force to separate polymer particles from gas, increasing the residence time of catalyst-reactant contact and enabling higher production rates without compromising the fluidized bed's temperature uniformity
2Productivity
If condensation-inducing substances are added to circulating gas, then production amount is increased, but reaction conditions change drastically and additional investment costs are incurred
Solution Approach 1:
Instead of changing the chemical composition of the circulating gas by adding condensation-inducing substances, the invention changes physical parameters: the gas flow rate, pressure, and velocity are optimized to enhance mass transfer and catalyst-reactant contact frequency. The distribution plate geometry and inlet nozzle configuration are adjusted to improve mixing efficiency, achieving higher production without altering reaction chemistry or requiring additional equipment
3Productivity
If liquid is directly injected into bubble fluidized bed, then production amount is increased, but pump installation and condensate storage are required
Solution Approach 1:
The invention uses pneumatic injection through the distribution plate, where gas pressure drives the circulating gas through the fluidized bed. This eliminates the need for liquid pumps and condensate storage systems while maintaining enhanced production rates. The gas-phase injection system leverages the existing fluidized bed dynamics to achieve efficient mixing and reaction
4Duration of action of moving object
If fluidized bed properties are used, then solid processing is simplified and residence time is extended, but catalyst-reactant contact frequency is reduced
Solution Approach 1:
The distribution plate is designed with specific hole patterns and geometries that create turbulent flow patterns and intermittent mixing zones within the fluidized bed. This mechanical disturbance increases the frequency of catalyst-reactant encounters while maintaining the extended residence time characteristic of fluidized beds, effectively resolving the contradiction between contact frequency and residence time
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 design enhances polymerization production rate, improves process stability, reduces maintenance and operating costs, and allows switching between High Sorption Mode and Non-Sorption Mode, preventing process shutdowns due to sorption amounts of 1% to 5%.
Implementation Method 1
promoting a vortex phenomenon to enhance catalyst and reactant contact
Implementation Method 2
the solid reactant also moves like a fluid
Data Source
Figure 1~2
Figure 3
AI summary
Proposed is a fluidized bed polymerization reactor, including a plenum located in a lower part of the fluidized bed polymerization reactor, a distribution plate located inside the plenum and having a hollow center, a discharge pipe discharging polymer particles, as connected to the hollow center of the dispersion plate and having a hollow cylindrical structure, and an inlet nozzle located on the outer surface of the plenum. The fluidized bed polymerization reactor is characterized in that an acute angle (θ) between a long axis of the inlet nozzle and a tangent of the plenum at an intersection with the long axis of the inlet nozzle is less than 90°, and a distance (d) between a lowermost end of the dispersion plate and an uppermost end of the inlet nozzle is 100 mm or more.