Shale Pyrolysis Retort With Zigzag Flow and Zoned Steam Heating
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Solution Overview
Problem
Shale oil production costs are uncompetitive with conventional crude oil due to high costs of retorting equipment, pre-production costs, energy costs, and water costs, limiting the economic viability of oil shale production.
Innovation Solution
A shale pyrolysis system with a retort featuring alternating angled sides and rounded corners, coupled with steam distributors and collectors for crossflow steam, and a steam temperature control subsystem to deliver varying steam temperatures across the retort, facilitating continuous shale movement and efficient pyrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional retorting equipment is used, then shale pyrolysis can be performed, but production costs become uncompetitive with conventional crude oil
Solution Approach 1:
The retort is divided into multiple zones with different temperature profiles (higher-temperature steam to upper sections, lower-temperature steam to lower sections), allowing simultaneous optimization of different pyrolysis stages in separate spatial regions, thereby improving overall productivity without requiring a single complex high-cost reactor
Solution Approach 2:
Different sections of the retort receive steam at different temperatures tailored to local pyrolysis requirements, with upper sections receiving higher-temperature steam for initial cracking and lower sections receiving lower-temperature steam for secondary processing, optimizing conversion efficiency while reducing total energy input costs
2Productivity
If high temperatures are applied throughout the retort, then pyrolysis reaction rate increases, but energy costs increase
Solution Approach 1:
The system applies higher-temperature steam locally to upper retort sections where primary pyrolysis occurs, and lower-temperature steam to lower sections where secondary processing occurs, maintaining high reaction rates where needed while reducing overall energy consumption
Solution Approach 2:
The retort is segmented into temperature zones with independent steam delivery, allowing the system to optimize reaction kinetics in the upper zone without unnecessarily heating the lower zone, thereby reducing total energy input while maintaining productivity
3Productivity
If steam is delivered uniformly across all retort sections, then equipment simplicity is maintained, but pyrolysis efficiency decreases
Solution Approach 1:
The steam temperature control subsystem delivers different temperatures to different retort sections (higher-temperature to upper sections, lower-temperature to lower sections), optimizing pyrolysis efficiency for each local zone while using a relatively simple control architecture based on staged steam injection
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 system enhances shale pyrolysis efficiency by maintaining optimal temperature zones, reducing production costs, and improving the economic competitiveness of shale oil production.
Implementation Method 1
steam distributors coupled to the first side and collectors coupled to the second side to produce crossflow of steam and heat across the descending shale from the first side to the second side
Implementation Method 2
a steam temperature control subsystem coupled to the steam distributors and configured to deliver higher-temperature steam to one or more upper sections of the retort and lower-temperature steam to one or more lower sections of the retort
Implementation Method 3
At suitably high temperatures, kerogen in the shale thermally decomposes, releasing gases and vapors that may be recovered as shale gas and shale oil
Implementation Method 4
The second side is opposite the first side and the first side and the second side include descending angled surfaces at alternating angles to produce zig-zag motion of shale descending through the retort
Data Source
AI summary
A shale pyrolysis system includes a retort with a first side and a second side. The second side is opposite the first side and the first side and the second side include descending angled surfaces at alternating angles to produce zig-zag motion of shale descending through the retort. Corners of the retort that change direction of the shale are rounded. The system includes steam distributors coupled to the first side and collectors coupled to the second side to produce crossflow of steam and heat across the descending shale from the first side to the second side, and a steam temperature control subsystem coupled to the steam distributors and configured to deliver higher-temperature steam to one or more upper sections of the retort and lower-temperature steam to one or more lower sections of the retort.