Process integration study of tail-end Ca-Looping process for CO 2 capture in cement plants

Comparison of Technologies for CO2 Capture from Cement Production—Part 1: Technical Evaluation

“…The calciner is modeled assuming complete calcination of the sorbent. Based on the data presented by Martínez et al [47], this assumption is justified considering the high residence time of the solids in a CFB calciner and the assumed calcination temperature of 920 • C. Further details about simulations of the CaL reactors are given by Spinelli et al [48], and details on the methodology used for simulation of the overall process, with extensive sensitivity analysis on the main process parameters are given by De Lena et al [49].…”

Experimental carbonation of CaO in an entrained flow reactor

“…13 The synergy between the Ca-looping and the cement production processes relies on the use of lime as part of the feedstock used for clinker production that allows integration of the purged CaO from the Ca-looping process into the clinker production line. Different configurations have been proposed in the literature for integrating the Ca-looping process into a cement plant, 14,15 but the most integrated option where the carbonator is integrated into the preheating tower of the clinker production line aims at the highest efficiency. 16 In this configuration, the carbonator of the Ca-looping process treats the flue gas exiting the rotary kiln after being properly cooled.…”

Calcination kinetics of cement raw meals under various CO2 concentrations

“…The power generated can then partially compensate for the energy required for the air separation unit and for the CO 2 compressor, thereby reducing the energy penalty of the CO 2 capture operation. [31][32][33] Different configurations have been proposed for the integration of calcium looping processes into cement plants. One alternative is the tail-end arrangement, where both carbonator and calciner reactors are independent units and the integration with the cement plant is carried out through introduction of the feed into the carbonator of the flue gas exiting the kiln and through purging CaO from the calciner, which replaces some of the calcium oxide required for the clinker production.…”

“…This configuration allows the operation in fluidized-bed reactors in a similar way to post-combustion CaL systems envisaged for the CO 2 capture in power plants, which reduces the uncertainties of this technology and facilitates its scaling-up. 27,28,31 In recent studies, the feasibility of this arrangement has been experimentally demonstrated in pilot plants of 30 kW th (ref. 34) and 200 kW th .…”