Gasifier Start-Up Stabilizer Flame Control
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Solution Overview
Problem
Dry coal feed is difficult to control during gasification start-up due to poor ignitability and sensitivity to flow rate and pressure conditions, making it challenging to maintain a stable flame and achieve reliable ignition.
Innovation Solution
A gasification system with a fuel feed system that includes a stabilization fuel line to initiate a stabilizer flame, gradually increasing the dry fuel flow rate to normal operating conditions while decreasing the stabilization fuel flow rate, and ceasing the stabilizer flame once stability is achieved, eliminating the need for additional start-up equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pilot-burner flame is used during start-up, then ignition can be achieved, but the system requires additional equipment and increased complexity
Solution Approach 1:
The patent removes the external pilot-burner equipment by extracting the ignition function directly into the gasifier combustion chamber. The stabilizer flame is generated within the gasifier using a stabilization fuel line, eliminating the need for separate pilot-burner hardware while maintaining reliable ignition capability
Solution Approach 2:
The stabilization fuel line serves multiple functions: it provides ignition fuel during start-up, maintains a stabilizer flame during low-flow conditions, and can be integrated with the existing fuel feed system. This multi-functionality eliminates the need for dedicated pilot-burner equipment while achieving the same ignition reliability
2Device complexity
If dry coal feed is used during start-up, then the system can operate with simplified fuel handling, but flow rate control becomes difficult and unreliable
Solution Approach 1:
The patent applies preliminary action by establishing a stabilizer flame using stabilization fuel before introducing or increasing the dry coal feed flow rate. This preliminary flame provides the thermal energy needed to ensure reliable ignition and stable combustion before the full dry fuel flow is established, overcoming the flow control difficulties at low rates
Solution Approach 2:
The stabilization fuel acts as an intermediary substance that bridges the gap between system start-up and normal dry fuel operation. It provides the necessary thermal energy and stable combustion conditions during the transition period, making the dry fuel feed system more reliable during the critical start-up phase
3Reliability
If stabilization fuel is used to initiate a stabilizer flame, then reliable ignition and stable flame maintenance are achieved, but additional fuel handling requirements are introduced
Solution Approach 1:
The patent merges the stabilization fuel handling with the existing fuel feed system infrastructure. The stabilization fuel line is integrated into the gasifier's fuel delivery system, sharing common components such as the fuel feed system controller, flow meters, and injection points, thereby minimizing additional handling complexity while achieving reliable flame stability
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 approach ensures reliable ignition and stable flame maintenance during gasification start-up, improving refractory life and reducing the complexity of start-up equipment, while maintaining stable gasifier performance.
Implementation Method 1
enable the stabilization fuel line to inject the stabilization fuel into the gasifier to initiate a stabilizer flame inside the gasifier
Implementation Method 2
dry fuel can be transported by a compressible fluid into a conveyance system
Data Source
AI summary
A gasification system including a first feed line, a second feed line, a stabilization fuel line, and a fuel feed system controller including a processor. The processor is programmed to enable the stabilization fuel line to inject a stabilization fuel into a gasifier to initiate a stabilizer flame inside the gasifier, enable the first feed line to inject a dry fuel into the gasifier at a start-up dry fuel flow rate, increase the flow rate of the dry fuel from the start-up dry fuel flow rate to a normal operating condition (NOC) dry fuel flow rate, decrease a flow rate of the stabilization fuel as the flow rate of the dry fuel increases to the NOC dry fuel flow rate, and prevent the stabilization fuel line from injecting the stabilization fuel into the gasifier once the flow rate of the dry fuel is at the NOC dry fuel flow rate.