Integrated Drying Gasification System for Coal
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Solution Overview
Problem
Conventional gasification processes face challenges in efficiently drying water-containing coal due to the complexity and high cost of pressurization systems, and the need for additional heat exchangers to adjust synthesis gas temperature, which increases equipment size and operational costs.
Innovation Solution
A gasification method and integrated drying system that uses recycled synthesis gas from a gasifier to dry coal in a dryer, followed by a loop seal type transfer system to transfer dried coal to the gasifier without a heat exchanger, enhancing drying capacity and simplifying the process by eliminating the need for mechanical valves and additional heat exchangers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a conventional pressurization system with mechanical valves is used to transfer dried coal to the gasifier, then the coal can be supplied at high pressure, but the system becomes complex and expensive
Solution Approach 1:
The patent replaces the conventional mechanical valve-based pressurization system with a pneumatic system using a loop seal and aeration gas. Dried coal is fluidized and transported through a loop seal mechanism driven by gas flow rather than mechanical valves, eliminating complex mechanical components while maintaining high-pressure supply capability
Solution Approach 2:
The invention uses pneumatic principles by introducing aeration gas to fluidize dried coal and create a gas-solid mixture that can be transported through pipelines and loop seals. This pneumatic transport system replaces mechanical pressurization methods, reducing device complexity while achieving the required supply pressure
2Temperature
If a heat exchanger is added to adjust synthesis gas temperature before drying coal, then the drying temperature can be controlled, but the equipment size and cost increase
Solution Approach 1:
The patent employs the self-service principle by utilizing the inherent temperature characteristics of synthesis gas directly from the gasifier for the drying process. The high-temperature synthesis gas is routed directly to the dryer without intermediate heat exchangers, allowing the system to self-regulate temperature based on the gasifier's output rather than requiring active temperature adjustment equipment
Solution Approach 2:
The invention extracts and eliminates the heat exchanger component from the conventional drying system. By taking out the heat exchanger and directly connecting the gasifier to the dryer, the system reduces equipment size and cost while maintaining effective drying through direct utilization of synthesis gas temperature
3Productivity
If synthesis gas is cooled before recycling to the dryer, then the drying efficiency improves, but the equipment size increases due to additional heat exchangers
Solution Approach 1:
The patent merges the synthesis gas recycling function directly with the drying process by routing hot synthesis gas from the gasifier outlet directly to the dryer inlet. This combined approach eliminates separate cooling and heating equipment, achieving high drying capacity through the integrated heat transfer from synthesis gas to coal while minimizing equipment footprint
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 increases the drying capacity of water-containing coal by 3 to 4 times, reduces equipment costs, and allows for the co-production of high-quality coal and synthesis gas, while simplifying the process and improving the transfer of dried coal to the gasifier.
Implementation Method 1
transferring the residual separated dried coal to a gasifier in a fluidic state using a loop seal type transfer means to which aeration gas is supplied by a plurality of ports
Implementation Method 2
drying the water-containing coal in the dryer, in which thermal energy necessary for drying the water-containing coal is supplied in contact with synthesis gas
Implementation Method 3
C+1/2O2 → CO (partial oxidation)
Implementation Method 4
C + H2O → CO + H2 (steam reforming)
Implementation Method 5
C + CO2 → 2CO (carbon dioxide reforming)
Data Source
Figure 1
Figure 2~3
AI summary
The present invention relates to a gasification process for efficiently co-producing synthesis gas and high-grade coal from water-containing coal, and to an integrated drying and gasification system for realizing the same.