Distributor Element for Homogeneous Steam Distribution in Once-Through Generators
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Solution Overview
Problem
Once-through steam generators with decentralized water separation systems face high construction and maintenance costs due to the large number of T-piece water separation elements required, which also limits geometric parameters and operational flexibility.
Innovation Solution
The introduction of a distributor element on the steam side between the water separation elements and the inlet collector of the superheater tubes ensures homogeneous distribution of the steam or water-steam mixture to the superheater tubes, allowing for a reduced number of water separation elements and simpler system design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of T-piece water separation elements are used in the decentralized water separation system, then water separation effectiveness is improved, but construction costs and device complexity increase
Solution Approach 1:
Multiple T-piece water separation elements are merged into a single centralized water separation chamber where flue gases from multiple evaporator tubes converge. This consolidation maintains water separation effectiveness while reducing the total number of separate elements, thereby lowering construction costs and simplifying the overall device structure.
Solution Approach 2:
The centralized water separation chamber serves multiple functions simultaneously: it acts as a water separation element, a flow distribution chamber, and a transition zone to the superheater. This multi-functionality eliminates the need for separate dedicated components for each function, reducing device complexity while maintaining effectiveness.
2Reliability
If a large number of T-piece water separation elements are used, then water separation is improved, but manufacturing and construction costs increase
Solution Approach 1:
The patent consolidates multiple water separation functions into a single centralized chamber, reducing the number of manufactured components from many T-piece elements to one integrated structure. This significantly lowers manufacturing and construction costs while maintaining the necessary water separation performance through the combined flow paths.
3Adaptability or versatility
If many water separation elements are used, then operational flexibility is maintained, but geometric parameters are limited
Solution Approach 1:
The centralized water separation chamber is designed with a three-dimensional flow path that allows flue gases from multiple evaporator tubes to converge and mix before entering the superheater. This spatial arrangement maintains operational flexibility by handling variable flow conditions from different tubes while occupying a compact geometric footprint, thus not limiting the overall plant geometry.
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 solution reduces construction costs and complexity while maintaining operational flexibility, ensuring even distribution and homogeneous temperature across superheater tubes, minimizing mechanical stress from thermal expansion.
Implementation Method 1
Each of the water separation elements comprising an inflow pipe section connected to the respective upstream evaporator pipes, which, viewed in its longitudinal direction, merges into a water discharge pipe section
Implementation Method 2
a distributor element on the steam side between the water separation elements and the inlet collector of the superheater tubes ensures homogeneous distribution of the steam or water-steam mixture to the superheater tubes
Implementation Method 3
the supplied water flows in a number of tubes, which transfer the energy in the form of radiant heat from the burner flames and/or by convection and/or by heat conduction from the flue gas produced during combustion
Implementation Method 4
the supplied water flows in a number of tubes, which transfer the energy in the form of radiant heat from the burner flames and/or by convection and/or by heat conduction from the flue gas
Implementation Method 5
steam generators are usually designed as water-tube boilers, i.e. the supplied water flows in a number of tubes, which transfer the energy in the form of radiant heat from the burner flames and/or by convection and/or by heat conduction from the flue gas
Data Source
AI summary
The generator (1) has a combustion chamber (2) with a set of burners for fossil fuels. An outer wall (12) of the chamber is formed from evaporation and overheating pipes, which are mounted upstream and downstream of a water separator system (22), respectively. The separator system has a set of water separation elements (24), where each separation element has an inlet tube (28) connected to upstream evaporator tubes. A distributor element (42) is arranged on an evaporator side between the water separator elements and an inlet collector (40) of the overheating pipes.