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This study aims to optimize the oxy-circulating fluidized bed combustion (oxy-CFBC) process by reducing the amount of flue gas with high-purity carbon dioxide. To achieve this, the stable transition from air mode to oxy mode is tested and validated in a 0.1-MW oxy-CFBC test rig. The results prove that flue gas carbon dioxide separation can achieve 96 vol% (dry) through a stable transition from air mode to oxy mode. Moreover, flue gas production emitted in oxy mode is reduced to one fifth compared to air mode. The proven technologies and oxy-fuel combustion database from this test rig operating experience can be used as empirical operating parameters for the next steps such as demonstration and commercial-scale operation.

Objective: Thí study aims to reseach the clinical and endoscopic features of adenoiditis and the efficacy of adenoidectomy with curette of La Force by local anesthesia. Material and method: To study on 35 children sufferring from adenoiditis, adenoidectomied with curette of La Force by local anesthesia, reviewed after 1 month at Buon Ma Thuot Hospital; with prospective descriptive method and having clinical intervention. Results: Mean of age was 8.1 ± 3.0 year old (2-15 years old). The most frequent preoperative clinical symptoms were nasal obstruction 94.3%, rhinorrhea 85.7%, sleep snoring 65.7%, sweating during sleep 62.9%. The postoperative clinical symptomps remarkably reduced compared with those before operating with rates respectively: nasal obstruction (94.3%-5.7%), rhinorrhea (85.7%-8.6%), sleep snoring (65.7%-14.3%), sweating during sleep (62.9%-20%). Preoperative endoscopic evaluation of hypertrophic degree of adenoids: degree I was 2.9%; degree II was 20%; degree III was 40%; degree IV was 37.1%. The change in hypertrophic degree of adenoids by endoscopic review at 1 month postoperatively: absence of adenoids 28.6%, adenoids being smaller than before operating 68.5%; adenoids having the same volume as before operating 2.9%. Conclusions: After adenoidectomy, the clinical symptomps of adenoiditis remarkably reduced; and by endoscopic review, absence of adenoids 28.6%, adenoids being smaller than before operating 68.5%.