Multiple Jets for Fluidized Bed Gasifier Temperature Control
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Solution Overview
Problem
The existing fluidized bed gasifiers face challenges with excessive ash agglomeration and reduced gasification efficiency due to uneven temperature distribution and difficulty in maintenance, particularly with the center jet pipe configuration.
Innovation Solution
The introduction of a plurality of jets symmetrically spaced through the gas distribution grid, connected to a distribution header, provides a high oxygen concentration gas medium, allowing for even temperature distribution and reduced jet penetration depth, while facilitating easier maintenance by eliminating the need to remove bulky ash discharge components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the amount of gas delivered through the center jet pipe is increased to maintain high gasifier capacity, then the gasification efficiency is improved, but the temperature in the center region becomes excessively high causing excessive ash agglomeration
Solution Approach 1:
The single center jet pipe is divided into multiple jets (typically 3-5 jets) arranged in a circular pattern. Each jet delivers gas at high velocity to create localized high-temperature zones, but the distribution across multiple points prevents excessive temperature concentration in a single center region, thereby reducing ash agglomeration while maintaining overall gasification efficiency.
2Speed
If the gas velocity in the center jet pipe is increased to fluidize the bed, then the fluidization is improved, but the jet penetration depth becomes disproportionately large reducing mixing effectiveness
Solution Approach 1:
By segmenting the single high-velocity jet into multiple jets with slightly lower individual velocities, the gas distributes more effectively across the bed. The multiple jets create shorter penetration depths that allow better mixing with particles, while the collective effect of all jets maintains sufficient fluidization velocity throughout the bed.
3Productivity
If the center jet pipe configuration is used to deliver high oxygen concentration gas, then the gasification efficiency is improved, but the maintenance becomes difficult requiring removal of bulky ash discharge components
Solution Approach 1:
The single integrated center jet pipe assembly is segmented into multiple smaller jets that can be independently accessed and maintained. The jets are positioned such that they can be reached through the ash discharge mechanism without requiring complete disassembly of bulky components, enabling easier routine maintenance while preserving the high oxygen concentration delivery capability for efficient gasification.
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 configuration maintains high gasification efficiency by preventing excessive ash agglomeration, ensures uniform temperature distribution, and simplifies maintenance by providing accessible jet replacement without disrupting the ash discharge system.
Implementation Method 1
a plurality of jets positioned through the gas distribution grid through which a second fluidizing medium is introduced into the fluidized bed region for fluidization of the solid feed stock
Implementation Method 2
a gas distribution grid housed in the lower portion of the vessel through which a first fluidizing medium is introduced to fluidize the solid feed stock
Implementation Method 3
The gas stream provided through the center jet pipe to the fluidized bed contains a higher oxygen concentration than oxygen concentration provided through the gas distribution grid. This higher oxygen concentration causes more oxidization of the feed stock in the center region of the fluidized bed
Data Source
AI summary
The present invention relates to apparatuses for fluidized bed using multiple jets to introduce gas into a fluidized bed region and methods of fluidizing. The apparatus for introducing fluidizing medium to a fluidized bed reactor comprises a vessel defining a fluidized bed region and in which solid feed stock is fed, a gas distribution grid housed in the lower portion of the vessel through which a first fluidizing medium is introduced to fluidize the solid feed stock, a plurality of jets positioned through the gas distribution grid through which a second fluidizing medium is introduced into the fluidized bed region for fluidization of the solid feed stock.