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Monday, 04 May 2015 08:01

Carbonic enrichment systems in Greenhouses

Two sources of CO2 are used in greenhouses to conduct carbon fertilization:

  1. The first comes from the use of flue gas (LPG and natural gas) generated in the same holding.
  2. The second uses pure liquefied gas obtained from industrial processes (fermentation, production of fertilizers, etc.).

Gases from industrial processes

depósito criogénico

The gases from industrial processes that allow the production of CO2 in an economic way, are liquefied, distributed and stored in cryogenic tanks to use as carbon dioxide fertilizer in intensive greenhouse cultivation.

For which type of greenhouse is best suitable?

This type of installation is suitable for intensive greenhouse cultivation where:

  • There is no heating demand during most of the crop cycle
  • Where the objective is to cover deficient levels at certain times when the ventilation rate is limited
  • In mild climate areas
  • Where the cultivation accurate carbonic fertilization to obtain an improvement in final quality.

Level of investment in this kind of projects

This facility is typical of projects with a medium level of investment and modernization in order to improve their productivity and quality. Installation from cryogenic tank, is formed by a distribution of plastic materials, similar to those used in drip irrigation systems, with lower densities of emitters due to lower required discharge (80-100 kg / h / Ha . 144-180 Nm / h / ha).

Combustion Gases

CO2 dosing systems which use combustion gases have dual uses:

  1. Heating equipment
  2. Electricy generating systems.

Combustion of each Methane kilogram produces 2.75 kilograms of CO2.

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We can distinguish:

  • Direct combustion systems: Combustion gases remain in the Greenhouse.
  • Central heating systems: When installing a sole generator system in the Greenhouse
  • Internal Combustion Systems: Cogeneration systems used for electricity in greenhouses.