Title
Integration of a high-pressure piperazine capture plant with a power plant: an energetic evaluation
Author
van der Ham, L.V.
de Kler, R.C.F.
Goetheer, E.L.V.
Publication year
2013
Abstract
Post-combustion CO2 capture can have a significant contribution to the reduction of CO2 emissions. However, it also requires a considerable amount of energy, causing a significant decrease in the net electricity output of the power plant it is associated with. A vast array of research initiatives is currently aimed at reducing this decrease. One of the main approaches is the development of improved solvents, replacing the conventionally used 30 wt% aqueous mono-ethanolamine (MEA) solution. Recently, Rochelle et al. [1] reported on the use of aqueous piperazine (PZ) and concluded that it could be the new standard solvent for CO2 capture. One of the discussed advantages of PZ is its thermal stability, allowing the regeneration step of the absorption process to be done at a temperature of 150 °C, instead of the 120 °C which is typically used for MEA solutions. This increased regeneration temperature, in combination with a higher CO2 desorption pressure, is claimed to allow a better energy performance of the capture plant. In the current work, we perform a more-detailed analyses of the energetic performance of a 1000 MWel coal-fired power plant in combination with a post-combustion CO2 capture process using 40 wt% aqueous PZ as solvent. Similar to the work by de Miguel Mercader et al. [2], the energy penalty will be evaluated by the integrated use of two types of model approaches. In this work, the capture plant is modeled in detail using Aspen Plus, while the power plant and CO2 compression are modeled with a high-level approach using efficiency performance curves that are based on a combination of fundamental and empirical relations. For the power plant, these curves give the operational envelope of the plant and describe the plant efficiency as function of power plant load and thermal energy withdrawal characteristics.
Subject
TS - Technical Sciences
Fluid Mechanics Chemistry & Energetics
Industrial Innovation
CO2 capture
Piperazine
Power plant integration
Energy efficiency
GTR - Gas Treatment
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TNO identifier
491769
Source
Conference Proceedings of the 7th Trondheim CCS Conference, 4-6 June, 2013, Trondheim, Norway
Document type
conference paper