Feedstock Dryer Steam Redirection IGCC Plant
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Solution Overview
Problem
High moisture content in solid fuels like biomass and low rank coals makes them difficult to gasify efficiently, leading to increased energy costs and operational issues such as fouling and plugging during handling and conveyance.
Innovation Solution
Redirecting medium pressure steam from existing IGCC plant components like the sulfur recovery unit and water-gas shift reactor to dry solid feedstock, utilizing its thermal energy for evaporation without significant changes to existing plant infrastructure, thereby enhancing energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional heating methods are used to remove moisture from solid feedstock, then moisture content is reduced, but energy consumption increases significantly
Solution Approach 1:
The system uses steam generated by the gasifier's own water-gas shift reactor and sulfur recovery unit to dry the feedstock, making the system self-sufficient. The steam that would otherwise be wasted is now utilized to remove moisture from feedstock, eliminating the need for external energy sources and reducing overall energy consumption.
Solution Approach 2:
The invention recovers steam from the water-gas shift reactor and sulfur recovery unit that would otherwise be discarded or underutilized. By capturing this steam and redirecting it to the feedstock dryer, the system transforms a waste resource into a valuable drying medium, significantly reducing the energy required for moisture removal.
2Ease of operation
If high moisture content feedstock is used for gasification, then feedstock handling is simplified, but gasification efficiency decreases and operational problems increase
Solution Approach 1:
The system performs preliminary drying of the feedstock using steam from plant components before the feedstock enters the gasifier. This pre-treatment step reduces moisture content to optimal levels, ensuring efficient gasification while maintaining ease of handling. The drying occurs upstream of the gasification process, preparing the feedstock in advance.
3Loss of energy
If steam is redirected from existing IGCC plant components for drying feedstock, then energy efficiency is enhanced, but plant complexity increases
Solution Approach 1:
The steam generated by the water-gas shift reactor and sulfur recovery unit serves dual purposes: maintaining its original function in the IGCC process and simultaneously providing heat for feedstock drying. This multi-functionality approach enhances energy efficiency without requiring separate dedicated steam generation systems, thereby limiting the increase in plant complexity.
Solution Approach 2:
The invention introduces a feedstock dryer as an intermediary component that captures steam from existing plant components and transfers it to the feedstock. This intermediary device facilitates the steam redirection process while integrating smoothly with the existing IGCC infrastructure, minimizing the increase in overall system complexity.
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 allows for more efficient drying of high moisture content feedstock, reducing energy consumption and operational challenges, while maintaining high plant efficiency with minimal modifications to existing systems.
Implementation Method 1
a heat exchanger that may transfer heat from a steam... to a solid feedstock
Implementation Method 2
The moisture in the fuel may be removed through heating
Data Source
AI summary
Steam may be used to dry feedstock prior to delivery to a gasifier. A steam supply may be delivered to embodiments such as a feedstock dryer. Heat from the steam may then be transferred into the feedstock and used in drying the feedstock. Steam pressures may include pressures from 75 pounds per square inch up to and including 900 pounds per square inch.