Integrated Dryer Water-Gas-Shift Catalyst for Gasification
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Solution Overview
Problem
Conventional gasification processes that utilize the thermal energy of synthesis gas to dry water-containing carbonaceous feedstocks only achieve limited advantages, and there is a need to enhance the efficiency of the gasification process by integrating a dryer with a water-gas-shift catalyst to maximize hydrogen and synthesis gas production.
Innovation Solution
A gasification method and system that involves integrating a dryer with a water-gas-shift catalyst, where a water-containing carbonaceous feedstock is dried while performing a water-gas-shift reaction, followed by solid-gas separation, and recycling a portion of the gasification product back into the dryer to utilize its energy for drying, with the catalyst supported on a monolithic structure for optimal steam production and hydrogen generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a dryer is disposed in front of a gasification reactor to dry water-containing carbonaceous feedstock using thermal energy of synthesis gas, then the feedstock can be dried, but additional equipment and energy consumption are required
Solution Approach 1:
The patent combines the dryer and water-gas-shift reactor into a single integrated unit. The dryer receives water-containing carbonaceous feedstock and heats it to remove water, while the water-gas-shift catalyst layer performs the water-gas-shift reaction simultaneously. This integration eliminates the need for separate drying equipment and reduces overall system complexity.
Solution Approach 2:
The integrated dryer-water-gas-shift reactor performs multiple functions: drying the feedstock by evaporating water, performing the water-gas-shift reaction to adjust H2/CO ratio, and providing thermal energy utilization. This multi-functional design replaces what would traditionally require separate units for each function.
2Productivity
If steam is supplied to a gasifier to gasify carbonaceous feedstock, then synthesis gas production increases, but additional energy input is required
Solution Approach 1:
The patent implements a feedback mechanism where part of the synthesized gas is recycled back to the integrated dryer-water-gas-shift reactor. This recycled gas provides thermal energy to drive the water-gas-shift reaction and drying process, reducing the need for external energy input while maintaining high synthesis gas production.
Solution Approach 2:
The system uses its own output (synthesized gas) to fuel the preprocessing stage (drying and water-gas-shift reaction). The recycled synthesized gas serves as both the product and the energy source for the reaction, creating a self-sustaining energy loop that minimizes external energy requirements.
3Manufacturing precision
If the ratio of carbon monoxide to hydrogen in synthesis gas is adjusted to 1:2 by water-gas-shift reaction, then the gas is suitable for Fischer-Tropsch and methanol synthesis, but additional reactors or hydrogen supply are needed
Solution Approach 1:
The patent merges the water-gas-shift reaction function into the dryer unit by incorporating a water-gas-shift catalyst layer. This allows the H2/CO ratio adjustment to occur simultaneously with the drying process, eliminating the need for separate water-gas-shift reactors and simplifying the overall process structure while achieving the required 1:2 H2/CO ratio for downstream applications.
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 enhances the efficiency of gasification by maximizing hydrogen production, reducing the need for additional steam, and optimizing the H2/CO ratio in synthesis gas, while minimizing energy consumption and equipment costs by integrating the water-gas-shift catalyst within the dryer.
Implementation Method 1
a dryer integrated with a water-gas-shift catalyst is disposed in front of a gasifier... performing a water-gas-shift reaction using the steam produced from the drying of the water-containing carbonaceous feedstock as a reactant
Implementation Method 2
drying the water-containing carbonaceous feedstock in the dryer while performing a water-gas-shift reaction using the steam produced from the drying
Implementation Method 3
recycling a part of the gasification product into the dryer in the step b) to provide an energy source for drying the water-containing carbonaceous feedstock
Data Source
Figure 1a
Figure 1b
Figure 2~3a
AI summary
The present invention relates to a gasification process and system, wherein a dryer integrated with a water-gas-shift catalyst is disposed in front of a gasifier.