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Clean fossil fuel heat and power plants - Nebb process solutions

[ Introduction ] [ General information ] [ Nebb process solutions ] [ ZENG-Oxyfuel pilot plant ]

[ Oxyfuel power process ] [ CESAm ] [ Combined hydrogen and power ]

Oxyfuel power process

Nebb has developed an oxyfuel power process with optimal separation of CO₂ and H₂O. Pressurized separation is advantageous for utilization of the heat of condensation from the steam.

The main marked for this process is coal based power production where gasified coal is the fuel for the gas turbine.

Figure 1 shows the principle of our process solution with electric power production with zero emissions of CO₂ and NO_X. The idea is to design a simple zero emission power plant with oxygen combustion under stoichiometric conditions. The process consists of a gas turbine in combination with a steam turbine that recovers energy in the expanded exhaust gas.

Figure 1: Nebb oxyfuel power process

The process is similar to a conventional combined cycle power plant, where the biggest difference is the work medium in the process that is generated by oxygen combustion. The energy in the expanded warm exhaust gas produce steam in a Heat Recovery Steam Generator (HRSG) that is principally similar as in a conventional combined cycle power plant.

Cooled exhaust gas, mainly CO₂ and vapour, is recycled back to a compressor. After the compressor some of the pressurized CO₂/H₂O-mixture is led to a Heat Recovery Condenser Separator- (HRCS) unit, where CO₂ and H₂O are separated by cooling and vapour condensation. Rejected heat from the condensation process is utilized in the bottoming steam cycle. After HRCS the CO₂ gas is further compressed to a delivery pressure.

The special feature of this process is pressurized separation of CO₂/H₂O mixture. The pressurized separation makes it easier to utilize rejected heat from vapour condensation. The condensation temperature is depending on the condensation pressure; a higher separation pressure gives a higher separation temperature.

A higher temperature level represents larger exergy, a theoretical size that indicate the potential to produce work from a given energy source. This means that the higher condensation pressure/temperature the bigger is the potential to transform rejected heat from condensation to high quality energy as work.

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	Tuesday, October 7th 2008	Markets > Energy > Clean fossil fuels Clean fossil fuel heat and power plants - Nebb process solutions [ Introduction ] [ General information ] [ Nebb process solutions ] [ ZENG-Oxyfuel pilot plant ] [ Oxyfuel power process ] [ CESAm ] [ Combined hydrogen and power ] Oxyfuel power process Nebb has developed an oxyfuel power process with optimal separation of CO₂ and H₂O. Pressurized separation is advantageous for utilization of the heat of condensation from the steam. The main marked for this process is coal based power production where gasified coal is the fuel for the gas turbine. Figure 1 shows the principle of our process solution with electric power production with zero emissions of CO₂ and NO_X. The idea is to design a simple zero emission power plant with oxygen combustion under stoichiometric conditions. The process consists of a gas turbine in combination with a steam turbine that recovers energy in the expanded exhaust gas. Figure 1: Nebb oxyfuel power process The process is similar to a conventional combined cycle power plant, where the biggest difference is the work medium in the process that is generated by oxygen combustion. The energy in the expanded warm exhaust gas produce steam in a Heat Recovery Steam Generator (HRSG) that is principally similar as in a conventional combined cycle power plant. Cooled exhaust gas, mainly CO₂ and vapour, is recycled back to a compressor. After the compressor some of the pressurized CO₂/H₂O-mixture is led to a Heat Recovery Condenser Separator- (HRCS) unit, where CO₂ and H₂O are separated by cooling and vapour condensation. Rejected heat from the condensation process is utilized in the bottoming steam cycle. After HRCS the CO₂ gas is further compressed to a delivery pressure. The special feature of this process is pressurized separation of CO₂/H₂O mixture. The pressurized separation makes it easier to utilize rejected heat from vapour condensation. The condensation temperature is depending on the condensation pressure; a higher separation pressure gives a higher separation temperature. A higher temperature level represents larger exergy, a theoretical size that indicate the potential to produce work from a given energy source. This means that the higher condensation pressure/temperature the bigger is the potential to transform rejected heat from condensation to high quality energy as work. Next >> 1996-2008 © Nebb Engineering as webmaster@nebb.no