Design and Experimental Investigation of Calcium Looping Process for 3‐kW_th and 1.9‐MW_th Facilities

Abstract

The calcium looping CO2 capture process using calcium oxide as a regenerable solid sorbent has been under development at the Industrial Technology Research Institute (ITRI) of Taiwan for several years. The 3‐kWth test facility built at ITRI is mainly composed of a fluidized‐bed carbonator and a rotary kiln calciner. The calcination efficiency, the CO2 capture efficiency, and operating stability were investigated. In addition, a cold model test facility has been constructed and a 1.9‐MWth pilot plant designed by ITRI is currently being erected. The combination of calcium looping and cement manufacturing process reduces the cost of adsorbent and calcination energy consumption.

Pilot plant experience with calcium looping

“…The transport of solid material takes place via a pneumatic conveying link. To ensure smooth solid flow and prevent mixing of gases between the two reactors, a series of tanks are used (Chang et al, 2013). Lab-scale experiments with this design have shown promising results, with high CO 2 capture, close to the equilibrium capture efficiency.…”

“…The INCAR-CSIC facility reported a maximum capture efficiency of 90% (Alonso et al, 2010), while the CANMET facility and Stuttgart facility reported 94% (Lu et al, 2008) and 93% , respectively. Chang et al (2013) Later, Ohio State University (Wang et al, 2010), Tsinghua University (Fang et al, 2009), and ITRI (Chang et al, 2013) successfully demonstrated process feasibility. As a result of their simplicity, lab-scale plants were used for detailed parametric studies.…”

“…The flue gas recirculation in the rotary kiln is expected to improve the temperature distribution (Chang et al, 2013). First results from the ITRI pilot plant are planned for 2014.…”

“…Table 9.2 gives a detailed comparison of these three pilot plants. Another 1.9 MW th (Chang et al, 2013) pilot plant for cement application was built and commissioned at ITRI, Taiwan in 2013. The facility design at ITRI is based on the 3 kW th lab-scale plant, where the carbonator is a BFB and the calcination is achieved in a rotary kiln.…”

“…Up to now, the pilot plant has been operated 1400 and 700 h in CO 2 capture mode. Stable oxy-fuel regeneration with flue gas recycle in the calciner was operated for more than 300 h. 9.2.2.4 The 1.9 MW th pilot plant at ITRI, Taiwan At ITRI, Taiwan, a 1.9 MW th pilot plant was planned and erected in 2013 for CO 2 capture from cement plant flue gases (Chang et al, 2013). The pilot plant is based on ITRI's design of a 3 kW th lab-scale pilot plant.…”