Hydrogen-Coal Burner Conduit Layout for Low-Emission Ignition
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Solution Overview
Problem
Pulverized coal boilers traditionally rely on diesel, propane, or natural gas for ignition, leading to undesired emissions and high operating costs, while plasma torches require frequent maintenance and have limited operational flexibility.
Innovation Solution
A burner system utilizing hydrogen as a secondary fuel, combined with pulverized coal and oxidants, to initiate combustion, reducing particulate and NOx emissions, and minimizing maintenance through improved combustion kinetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If diesel or fuel oil is used for ignition, then combustion start-up is achieved, but particulate and carbon monoxide emissions increase
Solution Approach 1:
The patent changes the chemical composition parameter of the ignition fuel from traditional diesel or fuel oil to hydrogen-enriched pulverized coal. Hydrogen has higher reactivity and burns more completely, producing water vapor instead of particulates and significantly reducing carbon monoxide emissions while maintaining effective combustion start-up capability.
Solution Approach 2:
The patent utilizes hydrogen that is already present in the pulverized coal feed or can be generated from coal gasification, eliminating the need for separate expensive ignition fuel storage and handling systems. The hydrogen is consumed during the ignition phase and integrated into the combustion process.
2Reliability
If plasma torches are used for ignition, then combustion initiation is achieved, but maintenance frequency increases and operational flexibility decreases
Solution Approach 1:
The patent replaces the complex mechanical and electrical plasma torch system with a simpler chemical combustion-based ignition system using hydrogen-enriched pulverized coal. This eliminates the need for high-voltage electricity generation, plasma arc maintenance, and associated mechanical components, thereby reducing maintenance frequency while maintaining ignition reliability.
3Ease of operation
If plasma torches are used for ignition, then combustion initiation is achieved, but capital cost increases
Solution Approach 1:
The patent creates a multi-functional system where the same hydrogen-enriched pulverized coal fuel serves both as the primary combustion fuel and as the ignition fuel. This eliminates the need for separate ignition fuel storage tanks, handling equipment, and plasma torch hardware, significantly reducing capital costs while maintaining effective combustion initiation capability.
4Productivity
If traditional burners are used, then pulverized coal combustion is achieved, but turndown ratio is limited
Solution Approach 1:
The patent implements dynamic control of hydrogen enrichment levels in the pulverized coal fuel, allowing the combustion system to adapt to varying load conditions. By adjusting the hydrogen concentration and airflow rates in real-time, the burner achieves a wide turndown ratio while maintaining stable combustion and high productivity across different operating conditions.
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 achieves reduced emissions, lower operational and capital costs, and enhanced operational flexibility with minimal maintenance, utilizing existing hydrogen storage for fuel, and providing improved durability and turndown ratios.
Implementation Method 1
the hydrogen and the hydrogen oxidant output from the outlet of the hydrogen oxidant conduit passes through a portion of the first pulverized coal entrained fluid flow conduit for being output from the burner
Implementation Method 2
a burner for a combustion chamber... hydrogen output from the outlet of the inner hydrogen conduit passes through a portion of the hydrogen oxidant conduit to the outlet of the hydrogen oxidant conduit
Data Source
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AI summary
A burner including a first pulverized coal entrained fluid flow conduit; an inner hydrogen conduit; and a hydrogen oxidant conduit positioned between the first pulverized coal entrained fluid flow conduit and the inner hydrogen conduit; an outlet of the inner hydrogen conduit positioned a first distance from an outlet of the hydrogen oxidant conduit such that hydrogen output from the outlet of the inner hydrogen conduit passes through a portion of the hydrogen oxidant conduit to the outlet of the hydrogen oxidant conduit; and the outlet of the hydrogen oxidant conduit being a second distance from an outlet of the first pulverized coal entrained fluid flow conduit such that the hydrogen and the hydrogen oxidant output from the outlet of the hydrogen oxidant conduit passes through a portion of the first pulverized coal entrained fluid flow conduit for being output from the burner.