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| Title | Bench-Scale Testing on 02/C02 Combustion for C02 Recovery |
| Creator | Miyamae, Shigehiro; Kiga, Takashi; Takano, Shin-ichi; Omata, Koji; Kimura, Naokazu |
| Publisher | Digitized by J. Willard Marriott Library, University of Utah |
| Date | 1994 |
| Spatial Coverage | presented at Maui, Hawaii |
| Abstract | Evaluating the characteristics of burnout efficiency, NOx conversion and flame behavior on pulverized coal firing with 02/flue gas recycling combustion for CO2 recovery, a bench-scale testing was conducted using a 1.2MWt tunnel type test furnace. From the viewpoint of the plant safety on full scale 02 combustion with recycled flue gas, pulverized coal was transported by flue gas as a primary stream and 02 conc. in a secondary stream was also limited to be less than 35%. Consequently, these limitations caused poor flame stability and char burnout due to lowering flame temperature by flue gas recycling. Enhancing the char burnout performance, therefore, an attempt was made to supply a part of pure 02 as a tertiary stream to the burner throat through an 02 injection nozzle. When 02 conc. in the secondary stream kept constantly to above limited value, the increase of the tertiary stream apparently improved the flame stability and the char burnout efficiency, as was expected. NOx emissions was not affected significantly by the presence of the tertiary stream, and it was found that lower NOx conversion was obtainable on 02/C02 combustion. |
| Type | Text |
| Format | application/pdf |
| Language | eng |
| Rights | This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee. |
| Conversion Specifications | Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth. |
| Scanning Technician | Cliodhna Davis |
| ARK | ark:/87278/s6pz5cd6 |
| Setname | uu_afrc |
| ID | 9501 |
| Reference URL | https://collections.lib.utah.edu/ark:/87278/s6pz5cd6 |
Page Metadata
| Title | Page 3 |
| Format | application/pdf |
| OCR Text | 3 (3) higher net plant efficiency on CO 2 recovery -higher gross plant efficiency by minimizing dry gas loss -lower energy penalty on CO2 recovery The authors also suggested that the 02/C02 combustion system was more economical than the conventional CO2 scrubbing process, as shown in Fig.3. Consequently, the 02/C02 combustion system is expected to be one of the promissing 'system on CO2 recovery from pulverized coal fired power stations. Firstly, an attempt was made to conduct an experimental works by a drop tube (electrically heated) furnace to study the characteristics of 02/C02 combustion, fundamentally. By the substitution of CO2 for N2 in air, NOx conversion decreased and it's effectiveness was counted to be 10-20%, while the char burnout was not affected. On 02/C02 combustion, the increase of 02 conc. in the oxidant enhanced the char burnout and the it's effect was found to become significant at the condition of reduced 02/fuel ratio to fuel rich. NOx conversion, which was briefly estimated from fuel-N content with ignoring thermal-NOx, decreased in the fuel rich 02 combustion, otherwise increased in the fuel lean O2 combustion, with the increase of O2 conc. of the oxidant. The fate of NOx ' in the oxidant -gas was also analyzed, taking into considerations of actual flue gas recycle. NOx was greatly decomposed into molecular N2 by reducing 02/fuel ratio, and it's reduction rate was estimated more than 90% at 02/fuel ratio of 0.8. This behavior was recognized to be similar reaction mechanism as the in-furnace NOx reduction. Consequently, the results on the drop tube furnace showed that 02/C02 combustion had a better char burnout and lower NOx emissions on comparison with the conventinal air combustion. Especially, NOx conversion could be reduced to 2%, which corresponded wi th about 40-50 ppm on air combustion. As a next research step, accordingly, an attempt was made to conduct a bench-scale test by a tunnel type test furnace. The paper described the experimental results on the bench-scale testing. |
| Setname | uu_afrc |
| ID | 9483 |
| Reference URL | https://collections.lib.utah.edu/ark:/87278/s6pz5cd6/9483 |