deaerator

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing deaerators in thermal power plants have limited deaeration efficiency due to short steam residence time and inadequate contact surface area between steam and water, leading to corrosion of boiler tubes and reduced heat exchanger performance.

Innovation Solution

A deaerator design that includes a tank with a spray unit and steam supply unit configured to spray water and steam in the same and opposite directions, utilizing baffles and porous plates to increase residence time and contact surface area, and a bleed unit to remove air, enhancing turbulence and deaeration efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If steam is sprayed in one direction only, then the deaerator structure is simple, but the residence time of steam is short and contact surface area is limited

Engineering Contradiction:

Improvedeaerator structureVSAvoidsteam residence time

Core Design Contradiction:

Device complexityVSDuration of action of moving object

Solution Approach 1:

The steam supply unit is divided into multiple nozzles positioned at different locations and orientations within the tank. Each nozzle sprays steam in a different direction (upward, downward, sideways) to segment the steam injection points, thereby increasing the residence time and contact surface area without significantly complicating the overall structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the tank receive steam sprayed in different directions from specifically positioned nozzles. The local spray direction and intensity are optimized for each region to maximize steam-water contact time and surface area, while the global structure remains relatively simple.

Inventive Principle:

Principle #3Local quality

2Device complexity

If steam is sprayed in one direction only, then the deaerator structure is simple, but the contact surface area of water with steam is limited

Engineering Contradiction:

Improvedeaerator structureVSAvoidcontact surface area

Core Design Contradiction:

Device complexityVSArea of stationary object

Solution Approach 1:

The steam supply system uses multiple nozzles positioned at different locations (top, bottom, sides of the tank) with different spray orientations. This segmentation of steam injection points creates multiple contact zones between steam and water, significantly increasing the total contact surface area while keeping each individual nozzle simple.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Steam injection is extended from a single-direction (one-dimensional) approach to multi-directional (three-dimensional) spraying. Nozzles are positioned to spray steam upward, downward, and sideways, utilizing three-dimensional space to maximize contact surface area without proportionally increasing structural complexity.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If deaeration effect is not increased, then gases such as oxygen are included in water supplied to the boiler, but increasing deaeration requires larger deaerator size

Engineering Contradiction:

Improvedeaeration effectVSAvoiddeaerator size

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

The patent changes the parameters of steam injection by positioning nozzles at different locations and orienting them in different directions. This parameter optimization increases the effectiveness of deaeration per unit volume, allowing high deaeration effect to be achieved in a compact deaerator size.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The deaerator utilizes a composite approach combining multiple steam injection methods (different directions, different positions) within a single compact unit. This composite strategy achieves superior deaeration effect without requiring a larger overall deaerator volume.

Inventive Principle:

Principle #40Composite materials

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 maximizes deaeration effect, prevents boiler tube corrosion, and improves thermal power plant efficiency by extending steam residence time and increasing contact surface area, allowing for miniaturization of the deaerator while maintaining or reducing its size.

Implementation Method 1

Methodology Applied

Scientific EffectTurbulence: Turbulence

Implementation Method 2

a spray unit installed at an upper portion of the tank to supply water

Methodology Applied

Scientific EffectSpray: Spray

Implementation Method 3

a bleed unit installed at the upper portion of the tank to be adjacent to the spray unit so as to bleed air of an inside of the tank

Methodology Applied

Scientific EffectGas removal:

Data Source

PatentEP3153792B1deaerator

Publication Date: 2020.11.04 DOOSAN HEAVY IND & CONSTR CO LTD

Figure 1
Figure 2
Figure 3~4

AI summary

The present invention relates to a deaerator for a thermal power plant capable of maximizing a deaeration effect, preventing a boiler tube from corroding, and increasing efficiency of a thermal power plant by forming a steam supply unit to spray steam sprayed from a steam supply unit in an internal space of a tank in the same direction as and the opposite direction to water sprayed from a spray unit according to a space in which the spray unit is installed to increase a residence time of the steam and a contact surface area of the steam with the water.