Pyrolysis Gasification Apparatus Using Superheated Steam
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Solution Overview
Problem
Current pyrolysis gasification technologies using solid refuse fuel are economically inefficient and prone to corrosion due to the use of high-temperature electric heaters, making it difficult to commercialize and maintain thermal efficiency in large-scale applications.
Innovation Solution
A pyrolysis gasification apparatus utilizing superheated steam for heating, which includes a cylindrical superheated steam housing, a tubular screw casing, and a conveying screw with heat accumulators to efficiently pyrolyze solid refuse fuel, eliminating the need for electric heaters and enhancing thermal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high temperature electric heaters are used to pyrolyze solid refuse fuel, then the pyrolysis temperature can be maintained at 450°C or higher, but the operational cost increases significantly and corrosion problems occur in large-scale applications
Solution Approach 1:
The system uses the refuse fuel itself as the heating source through direct injection into the screw conveyor, eliminating the need for external electric heaters. The fuel pyrolyzes and the resulting hot gases directly heat subsequent fuel material, creating a self-sustaining thermal process that significantly reduces operational costs while maintaining pyrolysis temperature.
Solution Approach 2:
The patent replaces the electric heating system with a direct fuel injection and combustion system. Instead of using electrical energy converted to heat through resistive heating elements, the system directly introduces fuel particles into the screw conveyor where they combust, providing thermal energy more efficiently and at lower operational cost.
2Use of energy by stationary object
If exhaust gas is injected into the pyrolysis apparatus for heating, then operational costs are reduced, but corrosion of the pyrolysis device occurs
Solution Approach 1:
The system extracts and utilizes the thermal energy from fuel combustion directly within the pyrolysis chamber, separating the heating function from the exhaust gas handling. By burning fuel directly in the screw conveyor, the system captures heat at the source rather than attempting to reuse exhaust gases, avoiding corrosion while maintaining energy efficiency.
3Ease of operation
If electric heaters are used for pyrolysis, then temperature control is straightforward, but the system becomes economically inefficient for large-scale operations
Solution Approach 1:
The system automatically maintains pyrolysis temperature through self-sustaining combustion of injected fuel particles. The thermal process regulates itself as hot gases from combustion continuously heat subsequent fuel material, eliminating the need for expensive electric heating while maintaining effective temperature control through the inherent thermal inertia and continuous fuel supply.
4Reliability
If conventional electric heating is used, then the pyrolysis process can be maintained, but thermal efficiency is insufficient for economically viable large-scale application
Solution Approach 1:
The patent replaces inefficient electric heating with direct fuel combustion within the pyrolysis chamber. This substitution dramatically improves thermal efficiency by eliminating heat transfer losses associated with electric heating elements and insulation, as the combustion occurs directly among the fuel particles being processed, ensuring maximum thermal energy utilization.
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 use of superheated steam improves the economic viability and thermal efficiency of the pyrolysis process, allowing for higher temperature control and increased fuel yield while reducing residue emissions, thus facilitating the commercialization of the technology and minimizing environmental impact.
Implementation Method 1
superheated steam may move through a movement path formed between an inside of the superheated steam housing and an outside of the screw casing to pyrolyze the solid refuse fuel
Implementation Method 2
a conveying screw with a plurality of screw blades on an outer peripheral surface, the conveying screw being installed inside the screw casing in the horizontal direction and rotating to convey the solid refuse fuel
Implementation Method 3
superheated steam is injected into the superheated steam housing
Data Source
AI summary
Provided is a pyrolysis gasification apparatus for solid refuse fuel. The apparatus includes: a superheated steam housing formed in a cylindrical shape and installed in a horizontal direction, in which superheated steam is injected into the superheated steam housing; a screw casing formed in a tubular shape extending from one end to the other end inside the superheated steam housing and installed in the horizontal direction inside the superheated steam housing, in which solid refuse fuel (SRF) is introduced into the screw casing; a conveying screw with a plurality of screw blades on an outer peripheral surface, the conveying screw being installed inside the screw casing in the horizontal direction and rotating to convey the solid refuse fuel; and a superheated steam supplier for supplying superheated steam into the superheated steam housing, in which the superheated steam may move through a movement pat.