Gasification Quench Ring Membrane Wall Cooling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Prior gasification systems face issues with thermal damage, corrosion, and slag accumulation, leading to premature wear and maintenance needs in the quench ring and metal floor of gasifiers, particularly due to high-temperature and corrosive syngas exposure, which can result in refractory erosion and quench ring overheating.
Innovation Solution
A gasification system with a membrane wall comprising refractory bricks and a cooling system using liquid coolant tubes to protect the quench ring and metal floor from hot syngas and slag, including a castable refractory material layer and a pump system for circulating coolant, forming a gas-tight barrier and maintaining a protective water film to prevent overheating and corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a quench ring is used to cool syngas, then cooling efficiency is improved, but thermal damage and corrosion from high-temperature syngas exposure worsen
Solution Approach 1:
A refractory lining is introduced as an intermediary protective layer between the hot syngas and the quench ring. This refractory barrier absorbs and withstands the thermal and chemical assault from the syngas, allowing the quench ring to perform its cooling function without direct exposure to the harmful high-temperature environment, thus resolving the contradiction between cooling efficiency and thermal damage resistance
Solution Approach 2:
The system employs a composite structure combining refractory materials with the quench ring assembly. The refractory lining (made of heat-resistant ceramic or brick materials) is applied to the inner surface of the quench ring or reaction chamber, creating a composite system where the refractory layer protects the metallic quench ring from thermal damage while the quench ring provides active cooling, thus maintaining both cooling efficiency and reliability
2Temperature
If refractory bricks are used to protect the metal floor, then thermal protection is improved, but refractory erosion from corrosive syngas worsens
Solution Approach 1:
A protective membrane wall is introduced as an intermediary barrier between the refractory bricks and the corrosive syngas. This membrane wall (typically made of corrosion-resistant alloy) prevents direct contact between the refractory material and the corrosive gases, eliminating erosion while preserving the thermal protection function of the refractory layer
Solution Approach 2:
The system uses a composite construction where refractory bricks are combined with a protective membrane wall coating or cladding. The refractory provides thermal insulation and heat resistance, while the outer membrane wall layer protects against chemical corrosion from the syngas, thus resolving the contradiction between thermal protection and erosion resistance
3Strength
If a metal floor is used to support the structure, then structural strength is improved, but wear and corrosion from hot syngas exposure worsens
Solution Approach 1:
The refractory lining and membrane wall serve as intermediary protective layers between the metal floor and the corrosive hot syngas. These layers shield the metal floor from direct exposure to harmful conditions, allowing the metal structure to maintain its strength without suffering from wear and corrosion
Solution Approach 2:
The floor assembly is constructed as a composite system combining metal structural elements with refractory and membrane wall protective layers. The metal provides structural strength and load-bearing capacity, while the refractory and membrane wall layers provide thermal and chemical protection, thus resolving the contradiction between structural strength and corrosion resistance
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 solution effectively reduces wear and corrosion of the quench ring and metal floor, extending the lifespan of gasifier components and minimizing downtime for maintenance by maintaining a stable temperature and preventing slag accumulation, thus enhancing the operational reliability of the gasification system.
Implementation Method 1
a cooling system using liquid coolant tubes to protect the quench ring and metal floor from hot syngas and slag
Implementation Method 2
a pump system for circulating coolant, forming a gas-tight barrier and maintaining a protective water film
Implementation Method 3
A gasification system with a membrane wall comprising refractory bricks and a cooling system using liquid coolant tubes
Implementation Method 4
maintaining a protective water film to prevent overheating and corrosion
Data Source
AI summary
A gasification system for the partial oxidation of a carbonaceous feedstock to at least provide a synthesis gas, the system comprising a reactor chamber and a quench section below the reactor chamber. An intermediate section connecting the reactor chamber to the quench section comprises at least one layer of refractory bricks arranged on and supported by the reactor chamber floor, the refractory bricks enclosing a reactor outlet opening. A membrane wall extends downwardly from the reactor outlet opening of the reactor chamber floor. A pump system is provided communicating with a source of a liquid coolant for circulating the liquid coolant through the tubes of the membrane wall.