Techno-economic assessment of two novel feeding systems for a dry-feed gasifier in an IGCC plant with Pd-membranes for CO2 capture

Abstract

This study focuses on the application of Pd-based membranes for CO 2 capture in coal fuelled power plants. In particular, membranes are applied to Integrated Gasification Combined Cycle with two innovative feeding systems. In the first feeding system investigated, CO 2 is used both as fuel carrier and back-flushing gas for the candle filters, while in the second case N 2 is the fuel carrier, and CO 2 the back-flushing gas. The latter is investigated because current dry feed technology vents about half of the fuel carrier, which is detrimental for the CO 2 avoidance in the CO 2 case. The hydrogen separation is performed in membrane modules arranged in series; consistently with the IGCC plant layout, most of the hydrogen is separated at the pressure required to fuel the gas turbine. Furthermore, about 10% of the overall hydrogen permeated is separated at ambient pressure and used to post-fire the heat recovery steam generator. This layout significantly reduces membrane surface area while keeping low efficiency penalties.The resulting net electric efficiency is higher for both feeding systems, about 39%, compared to 36% of the reference Selexol-based capture plant. The CO 2 avoidance depends on the type of feeding system adopted, and its amount of vented gas; it ranges from 60% to 98%. From the economic point of view, membrane costs are significant and shares about 20% of the overall plant cost. This leads in the more optimistic case to a CO 2 avoidance cost of 35 €/t CO2 , which is slightly lower than the reference case.

Hydrogen production in a Pore-Plated Pd-membrane reactor: Experimental analysis and model validation for the Water Gas Shift reaction

“…These membranes can be used as an independent unit for precombustion CO 2 capture in a H 2 production plant [8] or, the most interesting, in a membrane reactor, combining reaction and separation operations in an single step [9]. Besides equipment saving, membrane reactors can increase the amount of hydrogen because of the continuous product separation which shifts the reaction towards the product side [10]. Both membrane preparation strategies and best module configuration have been widely studied, although they are still under development.…”

Prediction and validation of external cooling loop cryogenic carbon capture (CCC-ECL) for full-scale coal-fired power plant retrofit

“…CO 2 penetrates the membrane faster than other species, specifically N 2 . The membranes are commonly made from polymers 33 and are sometimes made from other materials such as palladium 34 . The membrane selectively separates components in the stream, specifically the CO 2 molecules.…”

“…The distinct advantage they have is the absence of toxic chemicals. Membrane separation requires replacement membranes 35 as well as significant pumping power 36 , the latter resulting in energy penalties within the range of 0.95-1.9 MJ e /kg CO 2 captured 34,37 . They also struggle to produce high purity CO 2 .…”

Forecasting Energy-Related CO2 Emissions Employing a Novel SSA-LSSVM Model: Considering Structural Factors in China

“…The results show that the efficiency improved over 6 percentage points compared with first generation atmospheric oxy-combustion technology, which means SPOC makes up for the loss of efficiency due to carbon capture technology. Membranes [39,40] are another way to capture carbon, and Rezakazemi M [41] summarized the current status and future directions of mixed matrix membranes (MMMs), which will promote the development of carbon capture technologies.…”