Solids Heat Exchanger with Induction Heating for Drill Cuttings
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Solution Overview
Problem
Current methods for processing drill cuttings are inefficient in terms of space, energy, and cost, as they require transporting large volumes of hydrocarbon-contaminated materials from drilling rigs to shore for treatment, and existing heat treatment technologies lack effective heat control over a wide temperature range, restricting the separation of oil, water, and solids.
Innovation Solution
A solids heat exchanger apparatus using a shell and tube configuration with screw conveyors and a filter-condenser system, capable of operating between 100 and 800 degrees Celsius, employing thermal oil, flue gases, or induction heating to vaporize oil and water from drill cuttings, allowing for on-site treatment and efficient separation of hydrocarbons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical manipulation methods are used to heat drill cuttings for separation, then the equipment can process the material, but the throughput is limited to 2-3 tons per hour and energy consumption is high at 750 kW
Solution Approach 1:
The patent replaces the mechanical manipulation system (electric motor-driven) with a thermal field-based system using induction heating coils. The induction heating coils generate electromagnetic fields that directly heat the drill cuttings through eddy currents, eliminating the need for mechanical agitation and大幅提升 throughput while reducing energy consumption.
Solution Approach 2:
The patent changes the heating parameter from mechanical friction-based heating to electromagnetic induction heating, enabling temperature control over a wider range (100-800°C) and significantly improving processing efficiency. The induction heating system allows for precise temperature control and faster heating rates, directly addressing the throughput limitation.
2Temperature
If existing heating apparatus are used for heat treatment, then heating can be achieved, but effective heat control over a wide temperature range is lacking
Solution Approach 1:
The heating system is segmented into multiple independent induction heating coils that can be controlled separately. This allows different zones of the processing chamber to be heated to different temperatures simultaneously, enabling precise temperature control across a wide range (100-800°C) for effective separation of oil, water, and solids.
Solution Approach 2:
The induction heating coils are designed with dynamic control capabilities, allowing real-time adjustment of heating power and temperature distribution. The system can dynamically respond to process requirements, maintaining optimal temperature control across the entire operating range through feedback mechanisms and variable frequency drives.
3Productivity
If drill cuttings are stored and transported to shore for treatment, then processing can occur, but space utilization is inefficient and costs increase
Solution Approach 1:
The drilling rig is equipped with self-contained induction heating and separation equipment, enabling it to process its own drill cuttings on-site. This eliminates the need for external transport and shore-based processing facilities, achieving self-sufficiency in waste management and significantly improving space utilization on the rig.
Solution Approach 2:
The induction heating apparatus is designed as a multi-functional system that can handle various types of drill cuttings and operating conditions. The equipment serves multiple purposes: heating, separation, and potential recycling of materials, making the drilling rig self-sufficient and eliminating the need for dedicated transport and shore processing infrastructure.
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 apparatus enables efficient on-site treatment of drill cuttings, reducing oil content to less than 0.5%, allowing for safe disposal at sea and reclaiming base oil, while enhancing energy efficiency and throughput, and accommodating a wide range of materials and processes.
Implementation Method 1
an induction heating coil surrounding the vessel
Implementation Method 2
heating the drill cuttings for the purposes of separation of the oil and water from the solid matter
Data Source
Figure 1
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AI summary
A solids heat exchanger (10) is in the form of a shell and tube arrangement having a shell section (11) through which heated oil (12) passes and a tube section (13). A screw conveyor (14) extends along its length and has a drive motor (15). Drill cuttings or other hydrocarbon contaminated materials are fed in through an inlet (16) and then conveyed along the tube (13) where heat transfer takes place. On exiting the tube (13) oil and water vapour rises and escapes through a first outlet (17) while the now cleaned drill cuttings or other materials fall through a second outlet (18) forming a discharge zone. The apparatus aims to reduce the oil content of the solids to less than 0.5%. The solids can then simply be disposed of. The base oil can be reclaimed and reused.