In-Line Flocculant Injection for Mature Fine Tailings Dewatering
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Solution Overview
Problem
Current methods for dewatering mature fine tailings in the oil sands industry face challenges such as inefficient mixing and use of chemical additives, high maintenance requirements, and inability to achieve reliable dewatering due to the non-Newtonian behavior of mature fine tailings, leading to incomplete reaction and inefficient polymer usage.
Innovation Solution
An in-line injection device with a complementary conduit and multiple injection outlets is used to introduce a flocculating agent into the fluid flow of mature fine tailings, increasing the exposed surface area of the agent for improved mixing and reaction, thereby enhancing flocculation and dewatering efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional injection methods are used to introduce flocculating agent into mature fine tailings, then the injection process is simple, but the mixing efficiency is poor and polymer usage is inefficient
Solution Approach 1:
The injection system is segmented into multiple injection outlets distributed across the pipe cross-section, allowing the flocculating agent to be injected at multiple locations simultaneously. This segmentation improves mixing efficiency and ensures more uniform distribution of the polymer throughout the mature fine tailings stream, reducing waste and improving dewatering effectiveness.
Solution Approach 2:
Different regions of the pipe cross-section are targeted with injection outlets positioned to address local mixing needs. The injection outlets are strategically located to ensure the flocculating agent reaches areas where mixing is most needed, creating locally optimized conditions for flocculation throughout the entire stream.
2Reliability
If flocculating agent is injected into mature fine tailings, then flocculation is promoted, but mixing is incomplete due to non-Newtonian behavior
Solution Approach 1:
The single injection point is divided into multiple injection outlets arranged in a pattern across the pipe cross-section. This segmentation allows the flocculating agent to be introduced at multiple locations, creating multiple mixing zones that collectively ensure complete mixing throughout the non-Newtonian mature fine tailings stream, overcoming the limitations of conventional single-point injection.
Solution Approach 2:
The multiple injection outlets act as intermediaries that facilitate the interaction between the flocculating agent and the mature fine tailings. By distributing the injection points, the system creates intermediate mixing zones that bridge the gap between the injected polymer and the bulk material, ensuring thorough contact and reaction despite the non-Newtonian behavior of the tailings.
3Device complexity
If conventional injection methods are used, then the device complexity is low, but the maintenance requirements are high
Solution Approach 1:
The injection device is segmented into multiple outlets that can be individually accessed and maintained. This modular segmentation allows for easier repair and maintenance of specific injection points without requiring shutdown or complex disassembly of the entire system, reducing overall maintenance requirements despite the increased number of injection points.
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 solution enables faster and more efficient mixing of flocculating agents with mature fine tailings, reducing polymer usage and maintenance, while promoting effective flocculation and dewatering, thus addressing the inefficiencies of existing methods.
Implementation Method 1
the injection outlets being shaped and sized, and each having an orifice substantially smaller than that of the feed inlet so as to increase dispersion of the flocculating agent about the main outlet
Implementation Method 2
improve mixing of the fluid flow with said flocculating agent via an increased exposed surface area of the flocculating agent
Implementation Method 3
injection device for inline-injection of flocculating agent into a fluid flow of a pipeline of mature fine tailings in order to promote reaction of the flocculent agent with the mature fine tailings
Data Source
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AI summary
A method and device for in-line injecting of flocculent agent into a fluid flow of mature fine tailings (MFT). The method includes the steps of: a) providing a fluid flow of mature fine tailings to be treated along a given channel fluidly connected to the pipeline; b) providing a source of flocculating agent; and c) introducing flocculating agent inside the fluid flow of mature fine tailings via a plurality of injection outlets for injecting the flocculating agent into the fluid flow in a dispersed manner so as to increase an exposed surface area of the injected flocculating agent and thus increase a corresponding reaction with the mature fine tailings, for an improved flocculation of said mature fine tailings, and/or other desired end results. Also disclosed is a kit with corresponding components for assembling the in-line injection device to be connected in-line with the pipeline carrying the mature fine tailings to be treated.