Fluidized-bed Gasification Furnace Bed Material Dispersion
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Solution Overview
Problem
As the throughput of coal or other raw materials increases in fluidized-bed gasification, it becomes difficult to ensure that the bed material effectively passes to every corner of the gasification furnace, leading to uneven temperature distribution and reduced gasification efficiency, and the use of heat-resistant partitions complicates the furnace structure and increases production costs.
Innovation Solution
A fluidized-bed gasification method where the bed material is supplied from a downcomer into a dispersion section along the width of the bed-material-introduction-side wall, fluidized by blowing a fluidizing gas, and then evenly distributed into the gasification furnace, eliminating the need for heat-resistant partitions by ensuring uniform bed material distribution across the width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the throughput of raw material is increased, then productivity is improved, but the bed material cannot effectively pass to every corner of the gasification furnace, leading to uneven temperature distribution and reduced gasification efficiency
Solution Approach 1:
The gasification furnace is divided into multiple sections with separate bed material introduction sections at different locations. This segmentation allows bed material to be introduced at multiple points simultaneously, ensuring uniform distribution across the entire furnace volume even at high throughput conditions, thereby maintaining effective gasification throughout all sections.
Solution Approach 2:
Different regions of the gasification furnace are provided with dedicated bed material introduction sections tailored to local requirements. Each introduction section is positioned and designed to deliver bed material specifically to its corresponding region, ensuring that every corner receives adequate bed material for maintaining proper temperature and gasification efficiency.
2Manufacturing precision
If heat-resistant partitions are installed to ensure uniform bed material distribution, then gasification efficiency is improved, but the furnace structure becomes complicated and production costs increase
Solution Approach 1:
The invention removes the need for heat-resistant partitions by extracting the bed material distribution function to separate introduction sections positioned at strategic locations. Bed material is introduced directly at multiple points without requiring partition structures, thereby achieving uniform distribution while maintaining a simple, partition-free furnace structure that reduces complexity and production costs.
3Temperature
If heat-resistant partitions are installed to maintain temperature uniformity, then gasification efficiency is improved, but production costs increase
Solution Approach 1:
The furnace is segmented into multiple zones with dedicated bed material introduction sections, allowing each zone to maintain its own temperature uniformity through localized bed material supply. This eliminates the need for expensive heat-resistant partitions while achieving the desired temperature distribution, thereby reducing production costs.
Solution Approach 2:
The invention extracts the temperature control function from passive heat-resistant partitions to active bed material introduction sections. By introducing bed material at multiple strategic locations, temperature uniformity is achieved through process control rather than structural barriers, eliminating the need for costly partition installations.
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 method allows for even bed material distribution across the gasification furnace, maintaining desired gasification efficiency and preventing unreacted char discharge, while simplifying the furnace structure and reducing production costs by eliminating the need for heat-resistant partitions.
Implementation Method 1
blowing a fluidizing gas into the dispersion section to fluidize the bed material
Implementation Method 2
a gasification section for gasification of raw material supplied from a raw material feeder by heat of the bed material
Implementation Method 3
the char is burned and the bed material is heated while they are raised
Data Source
AI summary
Provided are a fluidized-bed combustion furnace 1, a separator 8 for separation into bed material 11 and an exhaust gas, a fluidized-bed gasification furnace 40 into which the bed material 11 is introduced through a downcomer 46 and into which raw material is introduced, a circulation passage for circulating char and the bed material 11 to the combustion furnace 1, a dispersion section 43 extending along a width of a bed-material-introduction-side wall 41 of the gasification furnace 40 to receive the bed material 11 from the downcomer, fluidizing-gas introduction means 47 for blowing fluidizing gas into the dispersion section 43 to fluidize the bed material 11 in the section 43, and a supply section 48 for supplying the bed material 11 in the dispersion section 43 to the fluidized-bed gasification furnace 40 substantially evenly throughout the width on the bed-material-introduction side.