Quick Lime Reforming Agent for Tar Decomposition in Produced Gas
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Solution Overview
Problem
Low temperature gasification of coal generates excessive tar, reducing fuel conversion efficiency and increasing operating costs, while conventional high-temperature reforming methods require large equipment and complex processes, and the use of oxygen further increases costs and safety concerns.
Innovation Solution
A method and device using calcium carbonate as a catalyst to reform tar in produced gas, generated by reacting quick lime with carbon dioxide, and regenerating quick lime through combustion, allowing for tar decomposition at lower temperatures with reduced oxygen consumption and equipment size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If low temperature gasification is performed to reduce combustion requirements, then fuel conversion efficiency and calorific value are improved, but tar content increases significantly
Solution Approach 1:
The patent introduces a reforming agent (metal oxide or metal hydroxide) as an intermediary substance that catalyzes the decomposition of tar into CO and H2 at low temperatures. This mediator enables tar removal without requiring high temperature combustion, thus resolving the contradiction between maintaining low temperature operation and reducing tar content.
Solution Approach 2:
The patent changes the chemical parameters of the gasification system by introducing specific reforming agents (metal oxides like Fe2O3, CuO, MnO2 or metal hydroxides) that alter the reaction pathways. This parameter change enables tar decomposition at lower temperatures through catalytic action, maintaining fuel conversion efficiency while reducing harmful tar content.
2Object-generated harmful factors
If conventional high temperature reforming is used to remove tar, then tar decomposition is effective, but equipment size and complexity increase
Solution Approach 1:
The patent changes the temperature parameter from conventional high temperature (above 1000°C) to low temperature (below 1000°C) operation by introducing catalytic reforming agents. This parameter change enables effective tar decomposition at lower temperatures, significantly reducing the equipment size and complexity required for the reforming process.
Solution Approach 2:
The patent replaces the mechanical/thermal system of high temperature combustion with a chemical catalytic system. Instead of using high temperature heat to decompose tar, the invention uses catalytic action of metal oxides or hydroxides to facilitate tar decomposition at lower temperatures, simplifying the equipment requirements.
3Productivity
If oxygen is used for combustion to maintain high calorific value, then fuel conversion efficiency improves, but equipment cost and operating cost increase
Solution Approach 1:
The patent introduces a reforming agent (metal oxide or metal hydroxide) as an intermediary that enables tar decomposition without requiring oxygen combustion. This mediator allows the system to maintain high calorific value by converting tar into CO and H2 through catalytic action rather than combustion, eliminating the need for expensive oxygen equipment.
Solution Approach 2:
The patent uses inexpensive metal oxides or metal hydroxides as reforming agents that can be easily supplied and replaced. These cheap catalytic materials enable effective tar decomposition without requiring expensive oxygen generation equipment, significantly reducing both equipment cost and operating cost while maintaining high calorific value.
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 method effectively reduces tar content in produced gas, increasing fuel conversion efficiency and calorific value, while minimizing equipment size and operational costs, and allows for stable continuous operation with improved catalyst activity.
Implementation Method 1
quick lime absorbs carbon dioxide in the produced gas to generate calcium carbonate
Implementation Method 2
calcium carbonate is burnt using heat by combustion of the auxiliary fuel to return the calcium carbonate to the quick lime
Implementation Method 3
calcium carbonate is burnt using heat by combustion of the auxiliary fuel to return the calcium carbonate to the quick lime
Implementation Method 4
a reforming reaction of the tar is performed with calcium as a catalyst using heat generated when the calcium carbonate is generated
Data Source
AI summary
Provided is a method of reforming a produced gas to reform tar contained in the produced gas from a gasification furnace. Quick lime comes in contact with a produced gas (3) from a gasification furnace (2) in a reformer (1) such that the quick lime absorbs carbon dioxide in the produced gas to generate calcium carbonate, and reforming reaction of the tar is performed with calcium as a catalyst using heat of reaction emitted during that time. In addition, as the calcium carbonate of the reformer (1) is supplied and burnt in a reforming agent regenerator (8), the quick lime is regenerated and supplied into the reformer (1) again. According to the above configuration, it is possible to provide a method and device for reforming a produced gas that are capable of simplifying equipment and operation thereof.