Hydrogen-Fired Fluidized Bed Calcination With Pipe-in-Pipe Fuel Lance
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Solution Overview
Problem
Existing calcination processes in fluidized bed furnaces face inefficiencies and high CO2 emissions, particularly in the use of conventional fuels, which limits their environmental and operational performance.
Innovation Solution
Utilizing a hydrogen-enriched gas mixture as fuel in a circulating fluidized bed furnace for calcination, combined with a pipe-in-pipe fuel lance and controlled injection, to enhance mixing and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional fuels are used in fluidized bed furnaces for calcination, then the calcination process can be maintained, but CO2 emissions are high and environmental performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameter of the fuel from conventional carbon-based fuels to hydrogen-enriched gas mixtures (10-100% hydrogen). This fundamental parameter change transforms the combustion chemistry, producing water instead of CO2, thereby resolving the contradiction between maintaining calcination productivity and reducing harmful emissions.
Solution Approach 2:
The patent employs gas-phase fuels (natural gas, biogas, or synthetic gas) that can be rapidly introduced and controlled, replacing traditional solid fuel systems. This enables flexible adjustment of fuel composition and rapid response to operational requirements while achieving low emissions.
2Object-affected harmful factors
If hydrogen-enriched gas mixture is used as fuel, then CO2 emissions are reduced, but fuel composition control and injection system complexity increase
Solution Approach 1:
The patent employs a pipe-in-pipe fuel lance configuration where an inner pipe delivers hydrogen-enriched gas and an outer pipe delivers secondary fuel or air. This nested structure integrates multiple fuel delivery functions into a single compact device, managing the complexity of hydrogen injection while maintaining system compactness and operational control.
Solution Approach 2:
The patent uses a pipe-in-pipe fuel lance as an intermediary device that mediates between the hydrogen gas source and the combustion zone. This intermediary structure enables controlled introduction of hydrogen, manages mixing with secondary fuels, and facilitates safe operation by separating different gas flows within the single lance assembly.
3Object-affected harmful factors
If hydrogen-enriched gas mixture is used as fuel, then environmental performance is improved, but mixing efficiency and furnace condition control become more challenging
Solution Approach 1:
The patent enables dynamic control of fuel composition by adjusting the ratio of hydrogen-enriched gas to secondary fuel in the pipe-in-pipe lance. This dynamic adjustment capability allows real-time optimization of combustion characteristics, maintaining ease of operation while achieving superior environmental performance through flexible fuel mixing control.
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 process achieves efficient calcination with low or zero CO2 emissions and improved control over furnace conditions, while allowing flexibility in fuel composition and reducing environmental impact.
Implementation Method 1
a hydrogen-enriched gas mixture is used as fuel for the calcination process
Implementation Method 2
fuel particles are suspended in a hot, bubbling fluidity bed of ash and other particulate materials (sand, limestone, ore etc.) through which jets of air are blown
Data Source
AI summary
A circulating fluidized bed (CFB) furnace for heating and/or calcination of a material is disclosed. A process for calcination of a material is further.