Gasifier Start-Up Burner Inert Atmosphere Control
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Solution Overview
Problem
During the start-up process of an integrated gasification combined cycle facility, the initial nitrogen gas supply leads to the production of combustion exhaust gas with residual oxygen, causing excessive temperature increases in filter elements and potential black smoke discharge due to unburned char, which is undesirable.
Innovation Solution
A gasifier start-up method involving a start-up burner that ignites a start-up fuel and oxygen-containing gas under an inert atmosphere, and an oxygen-level reducing step by mixing inert gas into combustible gas, to prevent oxygen production and char combustion, thereby preventing black smoke occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nitrogen gas is supplied during start-up, then the gasifier can be purged and pressurized, but combustion exhaust gas with residual oxygen is produced causing excessive temperature increase in filter elements
Solution Approach 1:
The patent extracts and removes the oxygen-containing combustion exhaust gas from the system by introducing inert gas (nitrogen or carbon dioxide) to displace and purge the oxygen-containing gas. This prevents the oxygen from reaching the filter elements and causing excessive temperature increases, while still allowing the start-up process to proceed efficiently.
Solution Approach 2:
The patent creates an inert atmosphere within the gasifier by supplying inert gas (nitrogen or carbon dioxide) during the start-up process. This inert environment prevents combustion reactions that would produce oxygen-containing exhaust gas, thereby eliminating the root cause of excessive filter element temperature while maintaining start-up productivity.
2Ease of operation
If oxygen-containing gas is supplied to the porous filter, then combustion can occur, but unburned char is discharged causing black smoke
Solution Approach 1:
The patent maintains an inert atmosphere in the gasifier during start-up by continuous supply of inert gas, which prevents the formation of oxygen-containing combustion exhaust gas. This eliminates the source of unburned char that would otherwise be discharged as black smoke, while still allowing controlled combustion to occur when needed.
Solution Approach 2:
The patent converts the potentially harmful oxygen-containing combustion exhaust gas into a beneficial inert atmosphere by introducing inert gas. This transforms the problem of black smoke discharge into an opportunity to control the combustion environment, ensuring complete combustion when required and preventing char discharge during start-up.
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 method effectively inhibits the temporary occurrence of black smoke during gasifier start-up by reducing oxygen levels in the gas to the ignition limit or lower, allowing normal operation without oxygen-containing gas supply to the porous filter, thus preventing char discharge.
Implementation Method 1
a start-up burner igniting step of supplying a start-up fuel and oxygen-containing gas to a start-up burner and igniting the start-up fuel and the oxygen-containing gas in the gasifier under an inert atmosphere
Implementation Method 2
an oxygen-level reducing step of reducing the level of oxygen in gas to an ignition limit or lower by mixing inert gas into combustible gas generated in the gasifier
Data Source
AI summary
A gasifier start-up method for a gasifier capable of preventing or inhibiting a temporary occurrence of black smoke when a gasifier is started-up. A gasifier start-up method for a gasifier, in which a gasifying agent and a solid carbonaceous fuel are supplied and gasified, includes a start-up burner igniting step of supplying a start-up fuel and oxygen-containing gas to a start-up burner and igniting the start-up fuel and oxygen-containing gas, under an inert atmosphere in which an inside of the gasifier around the start-up burner is filled with inert gas; and an oxygen-containing-gas supply adjusting step of adjusting the supply of the oxygen-containing gas such that combustion gas obtained after the combustion reaction of the start-up fuel and the oxygen-containing gas becomes the inert gas, which contains little oxygen.