Pressure Equalizing Structure for Gasification Furnace
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Solution Overview
Problem
In conventional gasification furnace apparatuses, in-furnace gas flowing out into the annulus section causes natural convection and results in continuous outflow of gas and accompanying dust, affecting the reliability of the pressure vessel and requiring significant cleanup efforts.
Innovation Solution
A pressure equalizing structure is implemented where the communication between the gasification furnace and the annulus section occurs in a region where the in-furnace gas temperature is higher than the annulus temperature, reducing natural convection and the outflow of in-furnace gas and dust by ensuring the gas flows out at a higher temperature, and incorporating a dust tray to collect the dust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure equalizing pipe is provided to communicate between the inside of the furnace and the annulus section, then pressure equalization is achieved, but in-furnace gas flows out into the annulus section causing natural convection and continuous outflow of gas and dust
Solution Approach 1:
The patent changes the temperature parameter of the equalizing gas by introducing it from a location downstream of the heat exchanger where the gas has been heated. This temperature parameter change prevents natural convection in the annulus section, resolving the contradiction between pressure equalization stability and harmful gas/dust outflow
Solution Approach 2:
The patent uses an intermediary approach by introducing external equalizing gas from the furnace outlet side rather than allowing direct outflow of cold in-furnace gas. This intermediary gas serves as a mediator that achieves pressure equalization without causing natural convection or dust carryover
2Reliability
If in-furnace gas temperature is lower than annulus temperature in the equalization region, then pressure equalization can occur, but natural convection is triggered causing continuous gas outflow
Solution Approach 1:
The patent modifies the temperature parameter of the equalizing gas by sourcing it from a location where the gas temperature exceeds the annulus temperature. This parameter change eliminates the temperature differential that drives natural convection, thereby stabilizing the gas flow while maintaining pressure equalization function
3Reliability
If pressure equalization is achieved by direct communication, then differential pressure fluctuations are suppressed, but dust accompanies the gas flow out into the annulus section
Solution Approach 1:
The patent introduces an intermediary equalizing gas from the furnace outlet side that is free of dust. This intermediary gas achieves pressure equalization and differential pressure control without carrying dust into the annulus section, thus preventing dust loss while maintaining pressure control reliability
Solution Approach 2:
The patent changes the physical state parameters of the equalizing gas by sourcing it from a location where the gas has been heated and cleaned. This parameter change ensures the equalizing gas is at a temperature higher than the annulus and free of dust, resolving both the pressure control and dust loss issues
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 effectively suppresses natural convection and reduces the amount of in-furnace gas and dust flowing into the annulus section, enhancing the durability and reliability of the pressure vessel and reducing cleanup time and labor.
Implementation Method 1
when the pressures are equalized at a place where the gas temperature inside the furnace (hereinafter called "in-furnace gas temperature") is lower than the temperature inside the annulus section (hereinafter called "annulus temperature"), the in-furnace gas flows out into the annulus section at temperature lower than the temperature of the inert gas and causes natural convection inside the annulus section
Data Source
AI summary
A pressure equalizing structure that includes: a gasification furnace (3) for gasifying a carbon-containing fuel; a pressure vessel (5) housing the gasification furnace (3); an annulus section (7) filled with an inert gas and provided between the gasification furnace (3) and the pressure vessel (5). A pressure equalizing part (13), which is connected to the gasification furnace (3) to communicate between the inside of the gasification furnace (3) and the inside of the annulus section (7), is provided in a region where the in-furnace gas temperature inside the gasification furnace (3) is higher than the annulus temperature inside the annulus section (7).