Carbon dioxide (CO2) is for some crops dosed during the season inside the greenhouse. The added carbon dioxide (CO2) assist the plants to grow faster and the revenues of the greenhouse are increased.
At present day commonly used ways to get these CO2 are: burning natural gas in a CHP or boiler, buying liquid CO2 in tanks or gaseous CO2 from a "dedicated pipe" (OCAP). All have their specific disadvantages (cost, low profitability, excess heat, etc.).
The opportunity CATO offers is to remove CO2 from flue gases and use the CO2 gas in the immediate vicinity. Biggest advantage of this solution is the low operational cost because no further processing is required. The costs of liquefaction and compression to high pressure are cancelled. Also, the gaseous CO2 does not have to be dried at local application.
The CO2 capture plant consist of an absorber, regenerator and several pump and heat exchangers.
The flue gases are in the absorbers brought in counter-current operation made into contact with the liquid amine operation is. The unsaturated amine liquid is added at the top of the absorber and the flue gases at the bottom. The amine absorbs liquid ( while it is falling down ), carbon dioxide ( CO2) until it is saturated . To ensure optimal contact between the liquid and the amine flue gas scrubbers are equipped with specially selected " internals " . At the upper side the flue gases without the CO2 leaves the absorber. At the bottom the saturated amine pumped away to the regenerator.
Saturated amine must be regenerated in order to use it again. This is done in the regenerator by " cooking " the CO2 out from the amine liquid. In order to prevent water loss , the off-gases of the regenerator (CO2 and water vapor ) are condensed and fed back into the process. Also a part of the energy is recovered.
The after a final purification 100 % pure CO2 that is released in the regenerator is dosed to the greenhouses.
For optimal recirculation of the liquid amine a number of pumps are incorporated in the circuit . In addition, plurality of heat exchangers are mounted in order to provide heating and cooling of the liquid amine.
This technology is very robust and has been for many years been successfully used in the petrochemical industry.
• Liquid CO2 production is energy intensive. By switching to gaseous CO2 much electricity is being saved.
• Through CO2 to produce on-site, there is no transport by trucks required . • The costs for gaseous CO2 are lower. As a result, it pays to inject more CO2 in greenhouses and thus increase production. Various sources of CO2 are interesting. Please contact us to discuss your requirements.