High-Temperature Deposition Solution Injector for Nuclear Reactors
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Solution Overview
Problem
Conventional deposition solution injectors in nuclear reactors face blockage issues due to the deposition of materials within the injection tap and along the feed-water line, leading to reduced platinum deposition on reactor surfaces and potential reactor shutdowns, as the ambient temperature solution breaks down when mixed with high-temperature, high-velocity feed-water.
Innovation Solution
A method and apparatus that inject the deposition solution beyond the boundary layer of the feed-water flow, using a hollow injector tube with a distal end extending beyond the bulk flow, a pipe stub for support, and an injection slot located downstream to prevent blockage and smearing, ensuring the solution is fully integrated into the bulk flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the deposition solution is injected at the conventional injection tap location, then the solution can be delivered into the feed-water line, but the solution breaks down and deposits material within the injection tap causing blockage
Solution Approach 1:
The injection tap is extracted from the conventional location and repositioned to extend beyond the boundary layer into the bulk flow region. This removes the injection point from the harmful boundary layer environment where decomposition and deposition occur, eliminating blockage while maintaining injection function.
Solution Approach 2:
The boundary layer itself becomes the intermediary element that the design accounts for. By positioning the injection tap to extend through the boundary layer into the bulk flow, the boundary layer acts as a separator between the injection point and the deposition-prone region, preventing material from depositing within the tap.
2Ease of manufacture
If the deposition solution is injected into the boundary layer region, then injection is simpler, but the solution cannot escape the boundary layer causing smearing of deposited material along the feed-water line
Solution Approach 1:
The injection point is extracted from the boundary layer region and positioned in the bulk flow region. This removes the injection location from the confined boundary layer, allowing the deposition solution to disperse freely into the bulk flow and prevent smearing along the pipe wall.
Solution Approach 2:
The injection geometry transitions from a wall-attached tap to an extended tap protruding into the flow field. This dimensional change allows the injection point to access the three-dimensional bulk flow region, enabling proper dispersion of the deposition solution and preventing two-dimensional smearing along the pipe surface.
3Device complexity
If the injection tap extends only to the inner surface of the feed-water line, then the tap structure is simpler, but deposited material forms within the end of the injection tap
Solution Approach 1:
The injection tap structure is modified with different local qualities: the main body remains simple and wall-attached, while the distal end extends beyond the boundary layer into the bulk flow. This localized geometric modification prevents deposition in the extended region while maintaining structural simplicity elsewhere, ensuring platinum reaches the reactor surfaces.
Data Source
AI summary
A method and apparatus for a deposition solution injector for a nuclear reactor that may inject an ambient temperature deposition solution into a high temperature, high pressure feed-water flow line. The method and the apparatus ensures that the deposition solution is delivered in a location within the feed-water that is beyond a boundary layer of flowing water, to prevent smearing of the solution and prevent clogging of the deposition solution within the injector. The axial cross-sectional profile of the injector, and the location of an injection slot on the injector, may reduce vortex eddy flow of the feed-water into the injector to further reduce injector blockage.