Geometrical Design Of Stand Pipe Air Distributors For The Combustion Of Municipal Solid Waste In A Fluidised Bed

2012 ◽  
Author(s):  
Anwar Johari ◽  
H. Hashim ◽  
M. Rozainee

Reka bentuk geometri bagi penyalur udara untuk pembakaran sisa buangan sampah perbandaran telah dihasilkan. Reka bentuk baru ini membolehkan bahan tidak terbakar dikeluarkan dengan mudah melalui ruang antara penyalur udara. Turus terbendalir dihasilkan menggunakan turus Perspex di mana udara disalurkan melalui penyalur udara di bawahnya. Untuk mendapatkan reka bentuk geometri yang sesuai, beberapa parameter reka bentuk telah dikaji. Kesan saiz bukaan, kesan jarak antara antara bukaan dan kesan jarak antara penyalur udara telah dikaji untuk mendapatkan reka bentuk geometri yang paling sesuai dan berdasarkan kepada kualiti perbendaliran di dalam turus terbendalir. Saiz bukaan yang dikaji adalah 1.5 mm, 2 mm, 3 mm dan 5 mm. Hasil kajian menunjukkan bukaan 3 mm menghasilkan kualiti perbendaliran yang stabil. Jarak antara bukaan yang dikaji adalah 10 mm, 20 mm, 30 mm dan 40 mm dan didapati buih udara yang terhasil adalah stabil apabila menggunakan jarak antara bukaan 10 mm. Jarak antara penyalur udara yang dikaji adalah 30 mm, 40 mm, 50 mm, 60 mm dan 70 mm. Hasil kajian menunjukkan jarak terbaik dari segi kestabilan buih udara bagi penyalur udara adalah 70 mm. Kata kunci: Penyalur udara; turus terbendalir; saiz bukaan; jarak antara bukaan; jarak penyalur udara The new geometrical design of stand–pipe air distributor for the combustion of the municipal solid waste was presented. The new design of the air distributors enables penetration of incombustible and unburnt carbon through opening between the air distributors, thus providing easy maintenance work. The fluidized bed experimental rig was constructed using Perspex column in which air was supplied through the distributors below it. In order to establish the final geometrical design of the air distributors, several design parameters were investigated. The effect of orifice size, distance between orifice and distance between distributor pipes on the fluidization behaviour were studied. Investigation on the effects of various orifice sizes of 1.5 mm, 2 mm, 3 mm, 4 mm and 5 mm showed that the 3 mm orifice size exhibited the most stable fluidization behaviour. Investigation on some selected orifice distances of 10 mm, 20 mm, 30 mm and 40 mm also found that the 10 mm orifice distance exhibited stable growths of bubbles. Various pipe distances of 30 mm, 40 mm, 50 mm, 60 mm and 70 mm were also investigated and the most suitable pipe distance was 70 mm. Key words: Air distributor; fluidized bed; orifice size; orifice distance; pipe distance

2002 ◽  
Vol 2002.12 (0) ◽  
pp. 293-295
Author(s):  
Daijyo KIMURA ◽  
Yasunobu HAMADA ◽  
Hiroo NIKAIDO ◽  
Tadashi ITO ◽  
Takashi SHIMONASHI

Author(s):  
Samuel P. Lucido ◽  
Willard Wilson

Abstract County State Aid Highway (CSAH) 13, located in Polk County Minnesota, was to be paved with 2.25 miles of new bituminous in October of 2000. Prior to the end of the 2000 construction season, a portion of one lane of the base course was installed, with the remainder to be completed in spring of 2001. The bituminous was amended with ash generated at the municipal solid waste combustor located in Fosston Minnesota. One third of the road was to be paved with traditional bituminous, one third was to be paved with bituminous in which a portion of the aggregate was replaced with “new” ash and one third was to be paved with bituminous in which a portion of the aggregate was replaced with “old” ash. “New” combustor ash is ash generated after the installation of an up-front materials recovery facility (MRF) and “old” combustor ash is ash generated before the installation of the MRF. Ash-amended bituminous was to be used in the base course and binder course of the pavement profile. Significant environmental and structural testing was performed prior to construction. Environmental and structural testing was also performed simultaneously with the construction process. Environmental testing completed in 2000 included: analysis of stack emissions from the bituminous plant, evaluation of breathing zone particulates at the bituminous plant, and analysis of surface water runoff from the ash-amended bituminous. Structural testing included trial mix design parameters. The road was also instrumented to collect water that may infiltrate through the ash-amended bituminous. Environmental testing to be completed in 2001 includes: evaluation of impacts to soils adjacent to the roadway and evaluation of infiltration water collected in the under-pavement collectors. Post-construction pavement testing is also to be completed in 2001. This paper presents the initial results of environmental and structural testing as well as construction issues.


Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 141
Author(s):  
Zhengzhen Yao ◽  
Zhonghui Xu ◽  
Qin Shuai ◽  
Xiaoyue Chen ◽  
Zao Jiang ◽  
...  

This study aims to explore the solidification performance of municipal solid waste incineration fly ash (MSWIFA) through co-mechanical treatment with circulation fluidized bed combustion fly ash (CFBCFA). The mineral characterization, physical properties, and leaching resistance of the solidified bodies are investigated by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetry-differential thermal analysis (TG-DTA), compressive strength, porosity, and leaching test, respectively. C–S–H, ettringite (AFt), and Friedel’s salt (FS) are the predominant hydrate products in the CFBCFA based solidified bodies, which are similar to the cement based solidified bodies. However, CFBCFA based solidified bodies exhibit higher compressive strength (36.7 MPa) than cement based solidified bodies (11.28 MPa), attributing to the three reasons: lower porosity and more compact internal structure of CFBCFA based solidified bodies; large amounts of Ca(OH)2 originating from MSWIFA are conducive to promoting the hydration reaction extent and compressive strength of the CFBCFA based solidified bodies; excessive Ca(OH)2 would cause compressive strength deterioration for the cement based solidified bodies. The heavy metals (Zn, Cu, Cr, Cd, and Pb) concentrations in the extraction solution of the CFBCFA based solidified bodies are far below the requirements of Chinese National Standard GB 5085.3-2007. The solidification of MSWIFA through co-mechanical treatment could be an ideal substitute for cement solidification technology.


2020 ◽  
Vol 22 (3) ◽  
pp. 836-850
Author(s):  
Astryd Viandila Dahlan ◽  
Hiroki Kitamura ◽  
Yu Tian ◽  
Hirofumi Sakanakura ◽  
Takayuki Shimaoka ◽  
...  

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