Hydrogen Pilot Burner Layout for Pulverized Coal Light-Off
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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 ignition systems have high capital costs and require frequent maintenance.
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 lowering maintenance and operational costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diesel or fuel oil is used for cold boiler light-off and heat up, then ignition is achieved, but particulate and carbon monoxide emissions increase and operating costs rise
Solution Approach 1:
The patent changes the chemical composition parameter of the ignition fuel from traditional diesel/fuel oil to hydrogen. Hydrogen's unique combustion characteristics (clean burning, high flame temperature) resolve the contradiction by providing reliable ignition while eliminating particulate and CO emissions associated with hydrocarbon fuels.
Solution Approach 2:
The patent employs a simple, inexpensive burner design that injects hydrogen directly without complex plasma generation equipment. This disposable-like simplicity in the ignition system eliminates the need for expensive, maintenance-intensive plasma torches while achieving the desired emission reduction.
2Reliability
If plasma torches are used for ignition, then ignition capability is achieved, but capital cost increases and maintenance requirements increase
Solution Approach 1:
The patent replaces the complex electrical/mechanical plasma generation system with a simple chemical combustion system using hydrogen injection. This substitution eliminates high-voltage electricity requirements, water cooling systems, and frequent maintenance needs while maintaining effective ignition capability.
Solution Approach 2:
The patent uses a simple, low-cost burner design for hydrogen injection rather than expensive plasma torches. This approach treats the ignition system as a simple, replaceable component rather than a complex, maintenance-intensive device, significantly reducing capital and operational costs.
3Ease of operation
If traditional burners are used, then operational simplicity is maintained, but turndown ratio and durability are limited
Solution Approach 1:
The patent implements a dynamic burner system where hydrogen injection rate can be varied to achieve different load conditions. The burner maintains simplicity in design while gaining adaptability through variable hydrogen flow control, enabling turndown ratios greater than 10:1 through proportional fuel-oxidant adjustment.
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 costs, and improved durability with minimal maintenance, leveraging enhanced combustion kinetics for environmentally friendly operation.
Implementation Method 1
hydrogen output from an outlet of the inner hydrogen conduit and hydrogen oxidant output from an outlet of the hydrogen oxidant conduit are allowed to mix with a first portion of a flow of pulverized coal... to form a pilot flame
Data Source
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.