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CLIMIT-Forskning, utvikling og demo av CO2-håndtering

Combined fixed bed processes for improved energy efficiency and with low penalty for CO2 capture

Alternative title: Kombinasjon av faststoff prosesser for økt energieffektivitet med laver fangstkostnader for CO2

Awarded: NOK 7.0 mill.

Project goals and objectives: The COMPOSITE project aims at merging two different CO2 capture technologies in order to utilize and strengthen their advantages and at the same time moderate their disadvantages. More specifically, the COMPOSITE project applies Chemical Looping Oxygen Production (CLOP) for Enhanced Pressurised Coal Gasification (EPCG) to produce syngas to be utilized in Chemical Looping Combustion (CLC). The integration of these technologies and the material and energy transfer between the reactors is the main novelty of COMPOSITE. Our main objective in COMPOSITE is to increase the energy conversion efficiency via this novel process intensification with inherent CO2 capture. Project outcome: Evaluation of the COMPOSITE concept integrated in an IGCC-environment gives a very high net energy efficiency (LHV) of 43-45% depending on type of gas cleaning. This efficiency is one of the highest obtained for coal-fired power generation including CO2 capture, and have efficiency close to the original process without capture (47%). The COMPOSITE technology can thus pave the way for efficient use of coal as a source including capture and pressurisation of CO2 for storage. Such process is of high importance for getting greener coal fired powerplant emitting very low amount of CO2 (5% of coal combusted). But there is still need for more research to get smarter solution avoiding some of the challenges seen, which relate to higher cost and complexity. Technical advantages: In the combined COMPOSITE process, the oxygen carrier material (OCM) will not be in direct contact with coal. Only the cleaned syngas produced after the hot gas cleaning step will be in direct contact thereby prolonging the lifetime of the oxygen carrier material. Several other advantages are seen in this process; the air separation unit (ASU) for the oxygen production can be avoided, while hot cleaning will avoid energy loss for this step, and the semi hot lean pressurised air can also be further heated and utilized in this concept with higher heating value. Moreover, the OCM used in this concept will be exposed to lower temperature and gas gradients during the redox processes giving a better prospective for the lifetime of the OCM. All together this can pave the way for a more efficient and sustainable power production based on fossil fuel. The main added-value of the project: The COMPOSITE project has demonstrated that this novel integration can produce CO2 neutral power with net efficiency of more than 45 LHV%.

This project aims at merging two different CO2 capture technologies into one, in order to utilize and strengthen their advantages and at the same time moderate their disadvantages. In this case use Chemical Looping Oxygen Production (CLOP) for Enhanced Pressurised Coal Gasification (EPCG) to produce syngas to be utilized in Chemical Looping Combustion (CLC). In the combined process the oxygen carrier materials (OCM) will not be in direct contact with coal. Only the cleaned syngas produced after the gas cleaning step will be in direct contact thereby prolonging the materials life time. Several other advantages are seen in this process. E.g. an ASU for the oxygen production can be avoided, hot cleaning will avoid energy loss for this step, and the semi hot lean pressurised air can also be further heated and utilized in this concept with higher heating value. The OCM used in this concept will be exposed for lower temperature and gas gradients during the redox processes giving a better prospective for the life time of the OCM. All together can this pave the way for a more efficient and sustainable power production based on fossil fuel. The aim of the COMPOSITE project is to study the potential of such a new concept through, collecting kinetics data from experiments and further use them in modelling of the CLOP, EPCG and CLC parts to establish boundary condition that further can be used for the overall energy- and mass balances for calculation of energy efficiency and the penalty of CO2 capture. The outcome will then be further used to benchmark this technology against state-of-the-art CO2 capture technology.

Funding scheme:

CLIMIT-Forskning, utvikling og demo av CO2-håndtering