| Claims Claim :1 The present invention “Hybrid System for CO2 Direct Air Capture - District Air Cooling (DAC-DC)” is providing a new method, apparatus and work steps for CO2 direct air capture (or CO2 from industrial flue gas) combined with district air cooling application in order to decrease the high cost of carbon capture process, According to the thermodynamics properties of the main components of air (or flue gas): CO2 changes its gaseous phase into a liquid phase under much less temperature and much less pressure than the other two major air components N2 and O2, So the present invention is based on compressing and cooling air/flue gas to the limit of liquefying CO2 only and separate it mechanically for sequestration or utilization while keeping N2 and O2 at their original gaseous phase overlaying the liquefied CO2 (according to their densities) to be released as cooled-pressurized N2 and O2 gases for district air cooling, with recovering the compressional thermal heat energy and the flow energy of the released cooled-pressurized N2 and O2 gases. Claim-2 the method according to claim 1 wherein said means combining carbon capture process with cooling applications Claim-3 the method according to claim 1 and claim 2 wherein said means capture CO2 from air or from any source by phase change separation under compression without use any CO2 absorbent material or membrane. Claim-4 The method according to claim 1 wherein said means using any district cooling process to capture CO2 from air or from any source Claim-5 The method according to claim 1 wherein said means compressing air under high pressure and cooling it by any heat exchanger with turbine to retrieve energy for any district cooling or any industrial cooling process with or without capturing CO2. Claim-6The apparatus according to claim 1 wherein said means a system for carbon capture consisting of: • High pressure air compressor 10 to compress air from atmosphere into the gases stratification towers 100 & 200 alternatively. • Two gases stratification towers 100 & 200 (to work alternatively for continuous district air cooling feeding) Each gases stratification tower 100 & 200 is connected from bottom with liquid drain pipe 102 with outlet liquid valve 104 to discharge the liquified CO2 and the condensated water to the COz/H2O collection tank 106. • Heat exchanger 20 with ORC cycle or steam cycle 30 connected to the two gases stratification assembly 100 & 200 to decrease the temperature under the high pressurized compressed air until converting CO2 from its original gaseous phase into a liquid phase while Nz and O2 will remain in their original gaseous phase overlaying the liquefied CO2 according to their densities. And also, to retrieve the generated thermal in order to reduce the energy consumption within the system. • CO2 collection tank 300 to store the separated CO2 for sequestration or utilizations/ • Flow turbine generator 400 to discharge the pressurized and cooled Nz and O2 gases within the gases stratification towers 100 & 200 through it in order to retrieve some energy and to decrease the kinetic energy, temperature and pressure of them e cooled and pressurized N2 and O2 gases 10 Claim-7The apparatus according to claim 1 wherein said means a system for district cooling or refrigeration consists of two or more pressure vessels working alternatively for continuous feeding with or without flow turbine generator. Claim8- the working steps according to claim 1 wherein said means steps asfollowing • The main compressor 10 will continuously compress air from atmosphere directly into the gases stratification towers 100 & 200 alternatively. • The compressed air temperature will be increased due to compression process. • The heat exchanger 20 will absorb the heat from the compressed air and cool it down within the gases stratification towers 100 and electricity will be generated by the ORC cycle or steam cycle 30. • The cooling process will be continued until reach to the desired pressure and temperature of CO2 liquifi cation. • Wait to establish the equilibrium between the different air components as the liquified CO2 and water will sink below the gaseous phase N2 and O2 • Open the outlet liquid valve 104 to discharge the liquified CO2 and the condensated water to the CO2/H2O collection tank 106 • Close the outlet liquid valve 104 • Open the CO2 outlet valve Open the CO2 outlet valve 302 & 108 • The liquified CO2 will return to gaseous phase as the pressure being released and will be compressed into the CO2 collection tank 300 through the valves 108 and 302 while the water will be discharged as a waste water through the valve 1 10. • Release the compressed-cooled N2 and O2 gases from the gases stratification towers 100 through the valve 1 12 to the flow turbine 400 for district air cooling and to recover energy and generate electricity. • While processing the cooled-compressed air within the gases stratification towers 100 the previous operations will be done within the gases stratification towers 200 in order to keep continuous district cooling feeding. • Discharge the captured CO2 from the CO2 collection tank 300 through the valve 304 for sequestration or utilization. |
Field of the invention:
The present invention is related to carbon capture and district cooling
Background Art :
COz capture became a mandatory to avoid global warming There are many technologies to capture COz from point source emitters and from atmosphere as Direct Air Capture DAC system. Also, there are many district cooling technologies.
For example, US8119091B2, US20100218507A1 patents that use absorbent to capture CO2 , WO2017218395A1 patent that use membrane to capture CO2
And the US 2015/0336044 Al patent for direct air capture from atmosphere.
Problems and defect in the prior art
The existing carbon capture technologies are very expensive to achieve the global climate goal. While all district cooling technologies are consuming high power energies associated with high COz/GHG emissions.
The US8119091B2, US20100218507A1 patents need high consumption of hydrocarbon fuel associated with extra CO2emissions as aheat source to recycle the absorbent without retrieving the waste heat energy
The WO2017218395A1 patent that use membrane to capture CO2 needs high power consumption and high maintenance without retrieving energy
The US 2015/0336044 Al patent needs very high energy consumption per ton of captured CO2 as the CO2 concentration at atmosphere is very low (about 400 ppm) without retrieving energy and also it takes very large surface footprint to be installed.
Disclosure Of The Invention :
New in the invention
The present invention “Hybrid System for CO2 Direct Air Capture - District Air Cooling (DAC-DC)” is providing a new method, apparatus and work steps for CO2 direct air capture (or CO2 from industrial flue gas) combined with district air cooling /industrial cooling/ large scale refrigeration applications in order to decrease the high cost of carbon capture process through retrieving the most of the energy consumed during the process. And to reduce the high cost of district air cooling/ industrial cooling without using any echo-harmful refrigerant as the most of large-scale cooling and refrigeration use
According to the thermodynamics properties of the main components of air (or flue gas): CO2 changes its gaseous phase into a liquid phase under much less temperature and much less pressure than the other two major air components N2 and O2, So the present invention is based on compressing and cooling air/flue gas to the limit of liquefying CO2 only and separate it mechanically for sequestration or utilization while keeping N2 and O2 at their original gaseous phase overlaying the liquefied CO2 (according to their densities) to be released as cooled-pressurized Ni and O2 gases for district air cooling, with recovering the compressional thermal heat energy and the flow energy of the released cooled-pressurized N2 and O2 gases.
Full description
The present invention “Hybrid System for CO2 Direct Air Capture - District Air Cooling (DAC-DC)” is providing a new method, apparatus and work steps for CO2 direct air capture (or CO2 from industrial flue gas) combined with district air cooling application in order to decrease the high cost of carbon capture process. According to the thermodynamics properties of the main components of air (or flue gas): CO2 changes its gaseous phase into a liquid phase under much less temperature and much less pressure than the other two major air components N2 and O2, So the present invention is based on compressing and cooling air/flue gas to the limit of liquefying CO2 only and separate it mechanically for sequestration or utilization while keeping N2 and O2 at their original gaseous phase overlaying the liquefied CO2 (according to their densities) to be released as cooled-pressurized
N2 and O2 gases for district air cooling, with recovering the compressional thermal heat energy and the flow energy of the released cooled-pressurized N2 and O2 gases.
Invention components
The present invention as shown in fig 1 &2 is consists of: -
• High pressure air compressor 10 to compress air from atmosphere into the gases stratification towers 100 & 200 alternatively.
• Two gases stratification towers 100 & 200 (to work alternatively for continuous district air cooling feeding) Each gases stratification tower 100 & 200 is connected from bottom with liquid drain pipe 102 with outlet liquid valve 104 to discharge the liquified CO2 and the condensated water to the CO2/H2O collection tank 106.
• Heat exchanger 20 with ORC cycle or steam cycle 30 connected to the two gases stratification assembly 100 & 200 to decrease the temperature under the high pressurized compressed air until converting CO2 from its original gaseous phase into a liquid phase while N2 and O2 will remain in their original gaseous phase overlaying the liquefied CO2 according to their densities. And also, to retrieve the generated thermal in order to reduce the energy consumption within the system.
• CO2 collection tank 300 to store the separated CO2 for sequestration or utilizations/
• Flow turbine generator 400 to discharge the pressurized and cooled N2 and O2 gases within the gases stratification towers 100 & 200 through it in order to retrieve some energy and to decrease the kinetic energy, temperature and pressure of them e cooled and pressurized N2 and O2 gases
Invention Work Steps
The working steps of the present, invention as shown in fig 1 and 2
• The main compressor 10 will continuously compress air from atmosphere directly into the gases stratification towers 100 & 200 alternatively.
1 The compressed air temperature will be increased due to compression process.
• The heat exchanger 20 will absorb the heat from the compressed air and cool it down within the gases stratification towers 100 and electricity will be generated by the ORC cycle or steam cycle 30 .
• The cooling process will be continued until reach to the desired pressure and temperature of CO2 liquification.
• Wait to establish the equilibrium between the different air components as the liquified CO2 and water will sink, below the gaseous phase N2 and O2
• Open the outlet liquid valve 104 to discharge the liquified CO2 and the condensated water to the CO2/H2O collection tank 106
• Close the outlet liquid valve 104
• Open the CO2 outlet valve 302 & 108
• The liquified CO2 will return to gaseous phase as the pressure being released and will be compressed into the CO2 collection tank 300 through the valves 108 and 302 while the water will be discharged as a waste water through the valve 110.
• Release the compressed-cooled N2 and O2 gases from the gases stratification towers 100 through the valve 112 to the flow turbine 400 for district air cooling and to recover energy and generate electricity,
• While processing the compressed air within the gases stratification towers 100 the previous operations will be done within the gases stratification towers 200 in order to keep continuous district cooling feeding.
• Discharge the captured CO2 from the CO2 collection tank 300 through the valve 304 for sequestration or utilization.
Brief description of Drawing :
Fig -1 Showing a profile for the main component of the present invention
Fig -2 Showing a plan view for the main component of the present invention
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