Sequential Zone Heating of Hydrocarbonaceous Material
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Solution Overview
Problem
Current methods for producing hydrocarbons from hydrocarbonaceous materials, such as oil shale, require significant energy input and increase the carbon footprint due to the use of fossil fuels for heating, which is inefficient and environmentally impactful.
Innovation Solution
The method involves sequentially heating zones of crushed hydrocarbonaceous material, starting from a lower zone and moving upward or downward, using a dynamic high-temperature production region that is maintained by injecting heated gas and then a cooler fluid to reclaim heat and redirect it to adjacent zones, reducing overall energy input and enhancing production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fossil fuels are used to provide heat for pyrolysis of oil shale, then hydrocarbon production is achieved, but energy expense and carbon footprint increase significantly
Solution Approach 1:
The patent merges the heating function with the hydrocarbon production process by using the produced hydrocarbons themselves as the heat source. The hydrocarbons generated from pyrolysis are combusted to provide the thermal energy needed for continued pyrolysis, creating a self-sustaining system where the product serves the function of the external energy input that would otherwise be required from fossil fuels.
Solution Approach 2:
The system achieves self-service by using the hydrocarbons produced from oil shale pyrolysis to fuel the heating process. The produced hydrocarbons are combusted to generate the heat required for further pyrolysis, making the system self-sufficient and eliminating the need for external fossil fuel inputs.
2Productivity
If fossil fuels are used to provide heat for pyrolysis of oil shale, then hydrocarbon production is achieved, but carbon footprint increases
Solution Approach 1:
The patent converts the potentially harmful combustion of fossil fuels into a beneficial process by combusting the produced hydrocarbons instead. This transforms what would be waste emissions into a useful heat source, eliminating the carbon footprint associated with fossil fuel combustion while maintaining the necessary thermal input for hydrocarbon production.
3Productivity
If entire body of hydrocarbonaceous material is heated uniformly, then hydrocarbon production is achieved, but energy efficiency decreases
Solution Approach 1:
The patent segments the heating process into distinct zones within the hydrocarbonaceous material body. Rather than uniform heating, the system creates a moving high-temperature production region that progresses through the material, with cooler zones following behind. This segmentation allows heat to be concentrated where needed for pyrolysis while cooler zones can recover and transfer heat back to the advancing front, reducing overall energy loss.
Solution Approach 2:
The system employs a dynamic heating approach where the high-temperature production region moves through the hydrocarbonaceous material over time. This dynamic progression allows different portions of the material to be heated sequentially rather than simultaneously, enabling heat recovery from cooler zones to be applied to the advancing hot front, thereby improving energy efficiency.
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 reduces the overall energy required for hydrocarbon production, increases efficiency, and allows for the recovery of heat from spent material, resulting in a more sustainable and cost-effective process for hydrocarbon extraction.
Implementation Method 1
A lower heating conduit can be embedded in the lower zone and an upper heating conduit embedded in the upper zone... flow of a heat transfer fluid through the heating conduits
Implementation Method 2
Valves can be used to control flow of the heat transfer fluid through the heating conduits... sequentially allow the heat transfer fluid to flow through the lower heating conduit and then through the upper heating conduit
Implementation Method 3
Heating oil shale allows kerogen in the oil shale to break down through the process of pyrolysis, yielding liquid and vapor hydrocarbon compounds
Data Source
AI summary
Systems for heating a body of crushed hydrocarbonaceous material to produce hydrocarbons therefrom can involve heating multiple zones of the body of material sequentially. An exemplary system can include a body of crushed hydrocarbonaceous material having a lower zone and an upper zone. A lower heating conduit can be embedded in the lower zone, while an upper heating conduit is embedded in the upper zone. A collection conduit is embedded in the upper zone at a location above the upper heating conduit. A lower heating valve is also operatively associated with the lower heating conduit and is capable of switchably flowing a heat transfer fluid through the lower heating conduit. An upper heating valve is operatively associated with the upper heating conduit and capable of switchably flowing the heat transfer fluid through the upper heating conduit. The lower heating valve and upper heating valve are also configured to sequentially flow the heat transfer fluid through the lower heating conduit and then through the upper heating conduit or through the upper heating conduit and then through the lower heating conduit.