Electrical Heating Oil Shale Retorting with Cross-Flow Gas
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Solution Overview
Problem
Conventional methods for retorting oil shale to extract hydrocarbons from kerogen result in low-quality synthetic crude oil, are costly, and environmentally unsustainable, as they rely on fossil fuel combustion and large infrastructure, failing to capture the full value of kerogen's chemical components.
Innovation Solution
A method and system for retorting oil shale using electrical energy, preferably from renewable sources, combined with a cross-flow sweep gas, to convert kerogen into valuable hydrocarbon streams, optimizing temperature and pressure conditions to produce high-value products like asphalt binder, alpha-olefins, and aromatics, while minimizing environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fossil fuel combustion is used to heat the retorting unit, then the process can achieve the required high temperatures for kerogen decomposition, but the environmental impact increases and energy sustainability deteriorates
Solution Approach 1:
The patent replaces the conventional mechanical/chemical combustion system with an electrical heating system. Electrical energy is used to heat the retorting unit, substituting the fossil fuel combustion process. This eliminates direct emissions from the heating process while maintaining the required high temperatures for kerogen decomposition, thereby resolving the contradiction between achieving high temperature and reducing environmental impact.
2Productivity
If large-scale infrastructure is built for conventional retorting operations, then production capacity increases, but capital costs and environmental pressures increase
Solution Approach 1:
The patent applies segmentation by dividing the retorting process into modular, scalable units. Instead of requiring large-scale integrated infrastructure, the system can be implemented as smaller modular plants that can be distributed and scaled incrementally. This reduces the complexity and environmental pressure of any single facility while maintaining overall production capacity through multiple units.
3Quantity of substance
If synthetic crude oil is produced through conventional retorting, then hydrocarbons are extracted from kerogen, but the product quality is low and requires costly further processing
Solution Approach 1:
The patent applies parameter changes by optimizing the retorting conditions (temperature, pressure, heating rate, atmosphere composition) to produce higher quality hydrocarbon products directly. By carefully controlling these parameters, the process generates products with better quality characteristics that require less extensive downstream processing, thereby resolving the contradiction between extracting hydrocarbons and achieving high product quality.
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 enables the production of high-value hydrocarbon products with reduced environmental burden and infrastructure requirements, utilizing modular, scalable systems that can be sited near oil shale deposits, thereby reducing costs and emissions.
Implementation Method 1
heating the heated retorting unit, at least partially, using electrical energy
Implementation Method 2
conveying a cross-flow sweep gas across a moving bed of the oil shale within the heated retorting unit, wherein the heated cross-flow sweep gas carries the kerogen oil out of the heated retorting unit
Implementation Method 3
Decomposition of the kerogen macromolecules to form more valuable smaller molecules is achieved by breaking chemical bonds, typically carbon-carbon bonds. Breaking chemical bonds is an endothermic process and thus external energy, in the form of heat, must be supplied. The decomposition of kerogen in this manner is typically called pyrolysis
Data Source
AI summary
A method of retorting oil shale is provided, comprising: continuously feeding oil shale into a retorting unit; heating the retorting unit using renewable electrical energy; converting the oil-shale kerogen into kerogen oil; conveying a cross-flow sweep gas across a moving bed of the oil shale, to carry the kerogen oil out of the retorting unit; recovering the kerogen oil; and recovering spent oil shale. The combination of electrical heating and cross-flow retorting achieves uniform heating to optimize the production of hydrocarbons. A system for retorting oil shale is also provided, comprising: a retorting unit; an inlet for continuously feeding oil shale; electrical-energy elements within the retorting unit; an inlet for conveying a cross-flow sweep gas through the retorting unit; and an outlet for the cross-flow sweep gas carrying the kerogen oil. The principles of the invention may be applied to ex situ systems, in situ systems, or hybrid systems.