System for utilizing carbon dioxide of flue gas captured by cold heat of liquefied natural gas
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Solution Overview
Problem
Current methods for regasifying liquefied natural gas (LNG) either harm marine ecosystems or waste energy, and there is a need for a system that can efficiently capture carbon dioxide from power generation flue gases for use in natural gas mining.
Innovation Solution
A system that utilizes the cold heat of LNG to capture carbon dioxide from power generation flue gases, which is then used as a filler in natural gas mining, incorporating a regasification and capture facility that exchanges heat with LNG to regasify the LNG and capture dry ice, and a transportation system to transport the dry ice to mining facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If seawater is used for regasification of LNG, then regasification can be achieved, but marine ecosystems are harmed
Solution Approach 1:
The patent introduces a closed-loop heat exchanger system as an intermediary between LNG and seawater. The heat exchanger allows thermal energy transfer from seawater to LNG for regasification, while preventing direct contact between seawater and the LNG storage tank, thus eliminating marine ecosystem harm while maintaining regasification capability
Solution Approach 2:
The system uses the ambient seawater temperature as a free heat source for regasification, and simultaneously uses the cold heat of LNG to drive power generation. The cold heat of LNG serves the dual purpose of power generation and providing cooling for the regasification process, making the system self-sufficient
2Use of energy by moving object
If natural gas is burned to generate heat for regasification, then regasification can be achieved, but energy is wasted
Solution Approach 1:
The patent implements a continuous cycle where LNG is regasified, the regasified natural gas is combusted to generate electricity, and the exhaust heat from power generation is used for seawater heating or industrial purposes. This continuous utilization of energy at multiple stages eliminates energy waste while maintaining regasification capability
Solution Approach 2:
The system changes the temperature parameter of seawater from ambient temperature to heated temperature through heat exchange with LNG cold heat and power generation exhaust. This parameter change enables the seawater to be used for heating or industrial processes, eliminating energy waste while maintaining regasification
3Object-generated harmful factors
If carbon dioxide is captured from flue gas, then carbon dioxide emissions are reduced, but additional processing equipment is required
Solution Approach 1:
The patent merges the carbon dioxide capture process with the existing power generation and regasification facilities. The cold heat of LNG is used to condense carbon dioxide from flue gas, and the captured carbon dioxide is utilized for enhanced oil recovery. This merging approach reduces carbon dioxide emissions without requiring completely separate processing equipment
Solution Approach 2:
The system converts harmful carbon dioxide emissions into a beneficial resource for enhanced oil recovery. The carbon dioxide that would normally be released into the atmosphere is instead captured and injected into oil fields to increase natural gas production, transforming an environmental problem into an economic benefit
4Power
If cold heat of LNG is used for power generation, then power generation efficiency is increased, but regasification temperature control becomes more difficult
Solution Approach 1:
The patent segments the LNG regasification process into multiple stages with different temperature requirements. The first stage uses cold heat exchange to regasify LNG at controlled temperatures, while the second stage uses exhaust heat from power generation to further warm the gas. This segmentation allows power generation efficiency to be maximized while maintaining precise temperature control during regasification
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 system increases power generation efficiency, reduces carbon dioxide emissions, generates profit through carbon emission rights, and improves natural gas mining performance by using captured carbon dioxide as a filler.
Implementation Method 1
the flue gas produced at the power generation facility and the LNG exchange heat with each other such that the LNG is regasified at an increased temperature
Implementation Method 2
the flue gas produced at the power generation facility and the LNG exchange heat with each other such that the LNG is regasified at an increased temperature and that the dry ice is captured from the carbon dioxide contained in the flue gas
Data Source
AI summary
A system captures carbon dioxide from a flue gas of a power generation facility by using cold heat of liquefied natural gas and utilizes the captured carbon dioxide for mining natural gas, using heat of the flue gas to regasify the LNG. Solidified dry ice is captured from gaseous carbon dioxide contained in the flue gas, and the captured dry ice is used as filler when mining natural gas. The system includes a mining facility, a vehicle to transport LNG liquefied by the mining facility; and a facility for regasifying the transported LNG and capturing dry ice from the carbon dioxide. In the regasification and capture facility, the flue gas exchanges heat with the LNG, thereby regasifying the LNG at an increased temperature and capturing the dry ice from the carbon dioxide. The captured dry ice is transported to the mining facility, which uses it for mining the natural gas.