CO2 Recovery Steam Extraction Segmentation
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Solution Overview
Problem
The amine absorption method for carbon dioxide recovery in thermal power plants results in significant energy consumption and reduced power generation output due to the large amount of steam required for regenerating the absorption liquid, leading to a decrease in turbine output.
Innovation Solution
A carbon dioxide recovery system with multiple stages of loaded absorption liquid heating means in the regeneration tower, utilizing steam with different pressures extracted from a turbine to heat the absorption liquid, reducing the need for high-pressure steam and minimizing turbine output reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high pressure steam is extracted from the low pressure turbine to supply the reboiler for heating the loaded absorption liquid, then the absorption liquid can be regenerated effectively, but the output of the low pressure turbine is significantly lowered and power generation output is reduced
Solution Approach 1:
The reboiler heating process is segmented into multiple stages: a first reboiler uses low pressure steam for initial heating, and a second reboiler uses high pressure steam for final heating to regeneration temperature. This segmentation allows optimization of steam usage at different stages, reducing the total amount of high pressure steam extracted from the turbine while maintaining effective regeneration.
Solution Approach 2:
The invention changes the pressure parameter of steam used at different heating stages. By using low pressure steam in the first reboiler and high pressure steam in the second reboiler, the system optimizes energy utilization and reduces the overall impact on turbine output while achieving effective absorption liquid regeneration.
2Temperature
If all thermal energy required for the reboiler is supplemented by steam extracted from the low pressure turbine, then the loaded absorption liquid can be heated to regeneration temperature, but the amount of steam extracted becomes large, causing significant reduction in power generation output
Solution Approach 1:
The heating process is divided into two segments: first reboiler heating to an intermediate temperature using low pressure steam, and second reboiler heating to final regeneration temperature using high pressure steam. This segmentation reduces the total high pressure steam requirement compared to using high pressure steam for the entire heating process.
Solution Approach 2:
The invention applies parameter changes by using different pressure levels of steam for different heating stages. Low pressure steam is used for the first heating stage and high pressure steam for the second stage, optimizing energy efficiency and minimizing the impact on power generation output while achieving the required regeneration temperature.
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 approach allows for efficient regeneration of the absorption liquid while reducing the amount of high-pressure steam required, thereby maintaining turbine output and improving power generation efficiency.
Implementation Method 1
a carbon dioxide absorption tower which absorbs and removes carbon dioxide from a combustion exhaust gas of the boiler by an absorption liquid
Implementation Method 2
a regeneration tower which heats and regenerates a loaded adsorption liquid with carbon dioxide absorbed therein
Data Source
AI summary
The carbon dioxide recovery system includes a carbon dioxide absorption tower which absorbs and removes carbon dioxide from the combustion exhaust gas of a boiler by an absorption liquid, and a regeneration tower which heats and regenerates the loaded absorption liquid with carbon dioxide. The regeneration tower includes plural loaded absorption liquid heating means, which heat the loaded absorption liquid and remove carbon dioxide in the loaded absorption liquid. The turbine includes plural lines which extract plural kinds of steam with different pressures from the turbine and which supply the plural kinds of steam to the plural loaded absorption liquid heating means as their heating sources. The plural lines make the pressure of supplied steam increase from a preceding stage of the plural loaded absorption liquid heating means to a post stage of the plural loaded absorption liquid heating means.