Ammonia Water Regeneration via Flash Evaporation and Compression
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Solution Overview
Problem
Current carbon dioxide capture systems, particularly those using chemical absorption methods, face significant energy loss due to the need for heating by a reboiler, which increases costs and reduces efficiency in reducing CO2 emissions.
Innovation Solution
A method and system utilizing an ammonia water regenerating system that includes a heat exchanger, stripper, flash drums, and compressors to regenerate ammonia water, replacing the traditional reboiler with flash drums and compressors to minimize energy loss by using flashed steam as a heat source and recompressing steam to reduce energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reboiler is used to heat the stripper for carbon dioxide capture, then carbon dioxide can be removed effectively, but a large amount of energy loss is generated
Solution Approach 1:
The patent utilizes phase transitions of water (liquid to vapor) in flash drums to generate steam that serves as the heating medium for the stripper. Rich solvent is flashed to produce steam, which then heats the stripper to release CO2, eliminating the need for external reboiler heating and reducing energy loss while maintaining effective CO2 removal
Solution Approach 2:
The system uses the rich solvent itself to generate the steam needed for stripping through the flashing process. The rich solvent is flashed in the flash drum to produce steam, which then serves as the heating medium for the stripper, creating a self-sufficient system that does not require external energy input for heating
2Productivity
If ammonia water is used to capture carbon dioxide, then carbon dioxide can be removed effectively, but the cost of capture increases due to energy consumption
Solution Approach 1:
The patent employs flash evaporation of rich ammonia water to generate steam that heats the stripper. This phase transition process converts the thermal energy in the rich solvent into useful heating energy, eliminating the need for external fuel combustion and reducing both energy consumption and capture costs while maintaining high CO2 removal efficiency
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 effectively reduces energy loss and enhances the efficiency of carbon dioxide capture, achieving the goal of lowering capture costs and emissions while maintaining effective CO2 removal.
Implementation Method 1
The heat exchanger is for performing a heat exchange treatment on a rich solvent and a lean solvent
Implementation Method 2
A first flashing step is performed, wherein the rich solvent is flashed in the first flash drum to form a first steam and a first flash liquid
Implementation Method 3
A first compressing step is performed, wherein the first steam is compressed by the first compressor and transferred to the first gas inlet of the stripper
Implementation Method 4
A stripping step is performed, wherein the first flash liquid is stripped by the first steam in the stripper to generate a carbon dioxide stripping gas and the lean solvent
Implementation Method 5
A second flashing step is performed, wherein the lean solvent is flashed in the second flash drum to form a second steam and a second flash liquid
Implementation Method 6
A second compressing step is performed, wherein the second steam is compressed by the second compressor and transferred to the second gas inlet of the stripper
Data Source
AI summary
A method for regenerating ammonia water after capturing carbon dioxide with aqueous ammonia includes steps as follow. An ammonia water regenerating system is provided, wherein the ammonia water regenerating system includes a heat exchanger, a stripper, a second pump, a first flash drum, a first compressor, a second flash drum and a second compressor. A first flashing step is performed, wherein the rich solvent is flashed to form a first steam and a first flash liquid. A first compressing step is performed, wherein the first steam is compressed. A stripping step is performed, wherein the first flash liquid is stripped. A second flashing step is performed, wherein the lean solvent is flashed to form a second steam and a second flash liquid. A second compressing step is performed, wherein the second steam is compressed.