Concentric Swirler Steam Separator for BWR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Boiling water reactors face a challenge in achieving high steam separation capability while minimizing pressure loss, which affects the quality of steam and thermal power output.
Innovation Solution
The steam separator design incorporates a smaller auxiliary swirler concentric with a main swirler, utilizing centrifugal force to separate steam and water, thereby reducing pressure loss and maintaining high steam quality at the outlet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steam separator is designed to improve steam separation capability, then the separation capability increases, but pressure loss increases
Solution Approach 1:
The steam separator is divided into multiple functional stages: a first stage with a main swirler for peripheral flow separation, and a second stage with an auxiliary swirler for axial flow separation. This segmentation allows each stage to handle specific flow patterns efficiently, improving overall separation capability while managing pressure loss through distributed separation rather than a single large separator.
Solution Approach 2:
Different regions of the steam separator are designed with different separation mechanisms tailored to local flow characteristics. The main swirler handles the peripheral region where centrifugal force is effective, while the auxiliary swirler addresses the axial region near the center. This local optimization ensures high separation efficiency in each region without requiring excessive pressure drop across the entire system.
2Productivity
If the core flow rate is increased to increase thermal power, then thermal power increases, but pressure loss increases and steam quality decreases
Solution Approach 1:
The steam separator design incorporates dynamic flow adaptation through the dual-swirler configuration that responds to varying flow rates. At higher core flow rates, the auxiliary swirler in the second stage becomes increasingly effective at handling the increased axial flow, maintaining separation performance and steam quality even as thermal power increases. This dynamic response allows the system to operate efficiently across a range of power levels.
Solution Approach 2:
The invention adds a vertical dimension to separation by implementing a two-stage arrangement where the first stage main swirler and second stage auxiliary swirler operate at different elevations. This vertical stacking creates additional separation zones without increasing the horizontal footprint, allowing high flow rates to be handled effectively while maintaining compact reactor design and controlling pressure loss.
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 design enhances steam separation efficiency, allowing for increased core flow rate and thermal power without increasing pressure loss, ensuring effective separation of steam and water.
Implementation Method 1
the steam separator separates the gas-liquid two-phase flow into steam and water. The separated water is introduced to the main swirler. When the water passes the main swirler, the water is separated at the inner wall by centrifugal force.
Data Source
AI summary
A steam separator comprises an outer main swirler and an inner auxiliary swirler which is smaller than the main swirler. The swirlers are provided so as to be concentric on the inner wall at the lower side of the first stage inner cylinder. In the steam separator, when the gas-liquid two-phase flow which flows in the vicinity of the axial center of the first stage inner cylinder passes the auxiliary swirler, it is separated into steam and water by the centrifugal force. The separated water (droplets) is introduced into the main swirler. When the separated water (droplets) passes the main swirler, it is separated at the inner wall side of the first stage inner cylinder by the centrifugal force.Pressure loss in a steam separator is reduced and steam separation capability is increased without increasing the moisture from the steam separator.