Feed Zone Delivery System for Carbonaceous Feedstock Density Reduction and Gas Mixing
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Solution Overview
Problem
Current feedstock delivery systems for thermochemical conversion of carbonaceous materials face challenges in maintaining high feedstock throughput, ensuring uniform distribution within reactors, and managing reactor pressure, which affects the efficiency of thermochemical reactions.
Innovation Solution
A feedstock delivery system comprising a weigh feeder, densification system, density reduction system, and gas and carbonaceous material mixing system, with a computer-controlled gas and carbonaceous material mixing chamber that regulates mass flow, density, and gas introduction to optimize reaction conditions within the reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbonaceous feedstock is continuously introduced into the reactor to maintain high throughput, then productivity is improved, but reactor pressure control becomes difficult and thermochemical reaction efficiency deteriorates
Solution Approach 1:
The feedstock is pre-densified before introduction into the reactor, creating a compact form that can be precisely controlled. This preliminary densification allows the feedstock to be introduced in a controlled manner that maintains reactor pressure while achieving high throughput
Solution Approach 2:
The system changes the physical state of feedstock from loose to densified form, and then controls its introduction rate and distribution. This parameter change in feedstock density and introduction characteristics enables simultaneous achievement of high throughput and pressure control
2Productivity
If feedstock is introduced at high rate to increase productivity, then feedstock throughput is improved, but uniform distribution within reactor deteriorates
Solution Approach 1:
The feedstock introduction system is segmented into multiple injection points distributed throughout the reactor. The densified feedstock is introduced at multiple locations simultaneously, ensuring uniform distribution while maintaining high overall throughput
Solution Approach 2:
Different regions of the reactor receive feedstock through dedicated injection points with optimized characteristics. This local quality approach ensures each region receives appropriate feedstock distribution, maintaining uniformity across the entire reactor volume
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 system ensures high feedstock throughput, uniform distribution, and controlled pressure, enhancing the efficiency of thermochemical reactions and product gas production.
Implementation Method 1
a densification system (2D0) configured to compress the weighed carbonaceous material (2C-02) received from the weigh feeder and form a densified carbonaceous material (2D-02)
Implementation Method 2
a density reduction system (2F1) configured to reduce the density of the densified carbonaceous material (2D-02) after it exits the densification system (2D0) to thereby form de-densified carbonaceous material
Implementation Method 3
a gas and carbonaceous material mixing system (2G1) configured to receive said de-densified carbonaceous material and introduce a gas into said de-densified carbonaceous material to form a carbonaceous material and gas mixture
Data Source
AI summary
A feedstock delivery system transfers a carbonaceous material, such as municipal solid waste, into a product gas generation system. The feedstock delivery system includes a splitter for splitting bulk carbonaceous material into a plurality of carbonaceous material streams. Each stream is processed using a weighing system for gauging the quantity of carbonaceous material, a densification system for forming plugs of carbonaceous material, a de-densification system for breaking up the plugs of carbonaceous material, and a gas and carbonaceous material mixing system for forming a carbonaceous material and gas mixture. A pressure of the mixing gas is reduced prior to mixing with the carbonaceous material, and the carbonaceous material to gas weight ratio is monitored. A transport assembly conveys the carbonaceous material and gas mixture to a first reactor where at least the carbonaceous material within the mixture is subject to thermochemical reactions to form the product gas.