CaO-based regenerative sorbents for CO2 capture in power generation and H2 production are receiving growing attention. A major challenge for this technology is the decay of sorbent activity with increasing number of the sorption/regeneration cycles. Evaluation of long-term sorbent activity...

Shale gas is viewed by many as a global energy game-changer. However, serious concerns exist that shale gas generates more greenhouse gas emissions than does coal. In this work the related published data are reviewed and a reassessment is made. It is shown that the greenhouse gas effect of shale...

Co-firing peat with lignite for power generation was studied at pilot-scale, focusing on the issue of ash deposition, the major concern for this application. A specially designed probe was used to measure the rate of ash deposition under similar conditions of power plant boiler operation....

This paper presents a concise overview of ash deposition in combustion or co-firing of biomass (woody biomass, agricultural residues, peat, <i>etc.</i>) with other fuels for power/heat generation. In this article, the following five research aspects on biomass combustion ash deposition are reviewed and...

High-temperature CO2 capture by Ca looping cycles was investigated in the presence of SO2. The sorbents tested included natural limestone (HV-P), pellets formed from powdered limestone with a binder (HV-AH) and pellets formed from powdered acetified limestone with a binder (HV10-AH). The binder...

Oxy-fuel combustion experiments have been carried out on an oxygen-fired 100kWth mini-circulating fluidized bed combustion (CFBC) facility. Coal and petroleum coke were used as fuel together with different limestones (and fixed Ca:S molar ratios) premixed with the fuel, for in situ SO2 capture....

This work investigates post-combustion CO2 capture at ambient temperature in a fixed bed by means of CaO-based sorbents. Two sorbents were used: limestone and pellets prepared from powdered limestone using calcium aluminate cement as a binder. The results showed that pre-hydration had a...

Steam can be used to lower calcination temperatures or to provide the process heat for calcination in a Ca-looping cycle because it can be removed from the CO2 stream by simple condensation. Here, the performance of limestone for CO2 removal from flue gases, calcined in the presence of steam,...