Heat Recovery Steam Generator Water Separation
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Solution Overview
Problem
The high number of decentralized water separation elements in heat recovery steam generators leads to increased construction and maintenance costs, as well as geometric limitations, due to the need for numerous T-piece water separation elements, which complicates the distribution of the water-steam mixture to superheater tubes, causing inhomogeneities and potential turbulence.
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, which collects flow medium from multiple evaporator tubes and uses a star distributor design to ensure homogeneous distribution, and the incorporation of flow turbulence dampers to mitigate turbulence caused by phase differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of decentralized water separation elements are used, then reliable water separation is achieved, but construction and maintenance costs increase
Solution Approach 1:
Multiple water separation elements are merged into a single centralized water separation chamber. The patent combines the functions of numerous individual T-piece water separation elements into one unified structure where water-steam mixtures from multiple evaporator tubes are collected and separated in a common chamber, reducing the total number of components while maintaining separation effectiveness
Solution Approach 2:
The centralized water separation chamber serves multiple functions simultaneously: it acts as a collection point for water-steam mixtures from multiple evaporator tubes, provides water separation through inertial forces, and distributes the separated steam to superheater tubes. This multi-functional design replaces numerous specialized components with a single versatile structure
2Reliability
If a large number of decentralized water separation elements are used, then water separation is achieved, but geometric flexibility is reduced
Solution Approach 1:
By merging multiple water separation functions into a single centralized chamber, the patent frees up geometric space and allows more flexible arrangement of evaporator tubes and superheater tubes. The consolidated structure eliminates the need to accommodate numerous individual water separation elements throughout the system, providing greater design freedom for optimizing the geometric configuration
3Device complexity
If water-steam mixture is distributed directly to superheater tubes, then simple distribution is achieved, but inhomogeneous flow and turbulence occur
Solution Approach 1:
The centralized water separation chamber acts as an intermediary between evaporator tubes and superheater tubes. It receives water-steam mixtures from multiple evaporator tubes, performs separation through inertial forces, and provides a stabilized, more homogeneous steam flow to the superheater tubes, preventing direct turbulence transmission
4Reliability
If numerous water separation elements are used, then water separation is reliable, but maintenance requirements increase
Solution Approach 1:
By consolidating multiple water separation elements into a single centralized chamber, the patent reduces the number of components that require maintenance. Instead of inspecting, cleaning, and repairing numerous individual water separation elements distributed throughout the system, maintenance personnel only need to access and service one centralized chamber
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 reduces the number of water separation elements, lowers production costs, ensures even distribution to superheater tubes, and maintains operational flexibility by preventing turbulence, thus reducing mechanical and thermal loads on components.
Implementation Method 1
the T-piece water separation element is designed for inertial separation of the water-steam mixture flowing from the upstream evaporator tube into the inflow tube piece. Due to its comparatively higher inertia, the water portion of the flow medium flowing in the inflow pipe section flows further at the transition point
Implementation Method 2
a distributor element is arranged on the steam side between the respective water separation element and the inlet header of the downstream superheater heating surfaces... ensure homogeneous distribution
Implementation Method 3
the incorporation of flow turbulence dampers to mitigate turbulence caused by phase differences
Implementation Method 4
A heat recovery steam generator is a heat exchanger that recovers heat from a hot gas stream
Implementation Method 5
In a once-through steam generator, the heating of the evaporator tubes leads to a complete evaporation of the flow medium in the evaporator tubes in one pass
Data Source
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AI summary
The invention relates to a waste heat steam generator (1) having a plurality of evaporator tubes (4) which are connected in parallel on the flow medium side, a plurality of overheating tubes (26) being mounted downstream of the evaporator tubes by means of a water separation system. Said water separation system comprises a number of water separating elements (12), each water separation element being respectively mounted downstream of a plurality of evaporator tubes (4) and/or upstream of a plurality of overheating tubes (26). Each water separating element (12) comprises an inlet pipe (14) which is respectively connected upstream to the evaporator tubes (4), said inlet pipe extending into a water evacuation pipe when seen in the longitudinal direction. A plurality of outflow pipes (18) branch off in the transitional area, said pipes being connected to a inlet collector (28) of the overheating tubes (26) which are respectively connected downstream. The aim of the invention is to provide said type of waste heat steam generator which is characterised in that it has a particularly high level of operational flexibility with comparatively low construction and reparation complexity. As a result, a distribution element (34) is arranged on the steam side between the respective water separating element (12) and the inlet collector (28).