Gasifier Quench Ring Shielding Gas Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gasifiers face efficiency and operability issues due to thermal stresses and corrosion in the quench chamber, which reduces the lifespan of quench rings and other components.
Innovation Solution
A shielding gas system is introduced to protect the quench ring and transition section by flowing a shielding gas, such as nitrogen or carbon dioxide, along the surface, creating an insulating barrier that inhibits thermal stress and corrosion, and reduces syngas recirculation in stagnant zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a quench ring is used to cool syngas in a gasifier, then the syngas temperature is reduced to saturation temperature, but the quench ring is subjected to thermal stresses and corrosion which reduces its lifespan
Solution Approach 1:
The patent introduces an inert shielding gas (nitrogen or carbon dioxide) that flows along the quench ring surface to create a protective atmosphere. This inert gas barrier prevents direct contact between the corrosive syngas/slag environment and the quench ring material, thereby reducing thermal stress and corrosion while maintaining the quench ring's cooling function and extending its operational lifespan.
Solution Approach 2:
The shielding gas acts as an intermediary substance between the syngas and the quench ring. By introducing this intermediate layer, the patent protects the quench ring from direct exposure to harmful thermal and chemical conditions, allowing the quench ring to perform its cooling function without suffering rapid degradation from thermal stress and corrosion.
2Productivity
If the quench chamber operates at high temperature to gasify carbonaceous materials, then syngas production efficiency is improved, but thermal stresses and corrosion increase reducing operability
Solution Approach 1:
The patent maintains high-temperature gasification conditions for efficient syngas production while introducing a shielding gas atmosphere that protects the quench ring and transition section. This creates a dual environment: the bulk gasification zone operates at high temperature for productivity, while the protected zones maintain reliability by being shielded from thermal stress and corrosion through the inert gas barrier.
Solution Approach 2:
The patent applies protective shielding gas flow specifically to critical components (quench ring and transition section) that are most vulnerable to thermal stress and corrosion, while allowing the main gasification chamber to operate at high temperature. This localized protection approach maintains overall system productivity while enhancing reliability of specific vulnerable components.
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 shielding gas system effectively reduces thermal stress and corrosion on the quench ring and transition section, enhancing the operational efficiency and lifespan of gasifier components.
Implementation Method 1
The flow of shielding gas creates an insulating barrier that protects the quench ring and the transition section by inhibiting thermal stress and/or corrosion
Implementation Method 2
The flow of shielding gas creates an insulating barrier that protects the quench ring and the transition section by inhibiting thermal stress and/or corrosion
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A system 10 includes a gasifier 12. The gasifier 12 includes a reaction chamber 31 configured to convert a feedstock 28 into a synthetic gas 30, a quench chamber 32 configured to cool the synthetic gas, and a transition section 60 between the reaction chamber 31 and the quench chamber 32. The gasifier also includes a quench ring 66 configured to provide a first flow of a coolant to the quench chamber 32 and a shielding gas system 11 configured to provide a second flow of a shielding gas to protect at least one of the quench ring 66 or the transition section 60.