Effect of Desulfurization Ash with Different Desulfurization Temperature and Gypsum Content on the Fluidity, Strength and Rebar Protection of Cement Based Materials

2010 ◽  
Vol 168-170 ◽  
pp. 940-944
Author(s):  
Xiao Dong Wen ◽  
Guo Song Li ◽  
Jiu Yong Song ◽  
Zhi Nan Gao
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Low Temperature ◽  
Flue Gas ◽  
Development Trend ◽  
Weight Percentage ◽  
Steel Rebar ◽  
High Temperature Furnace ◽  
Gypsum Content ◽  
Temperature Furnace

Depending on the desulfurization reaction temperature，it can be divided into fly ash generated at high-temperature furnace zone and at low-temperature flue gas zone. For simulating those two kinds of desulfurization ash, the ordinary fly ash mixed with different weight percentage of CaSO4•2H2O is divided into 2 groups, the first group is followed by calcining at 900 , another drying at 100 . And then by the experiment of workability, strength and steel rebar protection, the effect of morphology and amount of gypsum on material properties and the pretreatment method are studied. The results show that: compared with ordinary fly ash, those two kinds of desulfurization ash can improve workability, but the improving ability of desulfurization ash at high-temperature furnace zone weaker than another’s, in addition, amount of gypsum in desulfurization ash on fluidity has a threshold; Secondly, desulfurization ash can decrease strength, and the early strength of desulfurization ash at high-temperature furnace zone higher than another’s, but the development trend of later strength is in the opposite direction. Thirdly, those two kinds of desulfurization ash are harmless for steel rebar, and the steel rebar’s passive film compactness is followed desulfurization ash formed at low-temperature flue gas zone＞desulfurization ash formed at high-temperature furnace zone＞ordinary fly ash.

Improvement Research on Furnace Flue Tube of Three Medium Dryer System Used by Fan Mills

2013 ◽  
Vol 448-453 ◽  
pp. 3301-3305
Author(s):  
Zhen Yao Qu ◽  
Qiang Wang
Keyword(s):  
Low Temperature ◽  
Flue Gas ◽  
Large Scale ◽  
Gas Temperature ◽  
Test Bed ◽  
Hot Air ◽  
High Temperature Furnace ◽  
Water Side ◽  
Unit Capacity ◽  
Temperature Furnace

Pulverizing system equipped by fan mills uses three medium (ie. low-temperature furnace smoke, high-temperature furnace smoke, hot air) for drying coal, especially in large-scale plants burning lignite. A constantly increasing unit capacity leads to a more complicated design for pulverizing system, with a heavier weight of furnace smoke tube. This paper focuses on a research of water-cooled membrane flue tube instead of traditional inner and outer insulation tube through experiments like changing water side parameters to replace the low-temperature flue pipe from three medium to two medium (ie. adjustable-temperature furnace smoke, hot air). This paper studies heat transfer coefficient of water-cooled furnace smoke pipe at different flow rate and flue gas temperature though a established water-cooled furnace smoke pipe test bed. It is using a certain mathematic method to obtain dimensionless relationship among Nu, Re, Pr and obtain the dimensionless rule equation of water-cooled furnace smoke tube.

New high- and low-temperature apparatus for synchrotron polycrystalline X-ray diffraction

1998 ◽  
Vol 5 (3) ◽  
pp. 929-931 ◽  
Author(s):  
C. C. Tang ◽  
G. Bushnell-Wye ◽  
R. J. Cernik
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Closed Cycle ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Temperature Furnace ◽  
Wide Range ◽  
Powder Samples ◽  
Heater Coil ◽  
Temperature Furnace

A high-temperature furnace with an induction heater coil and a cryogenic system based on closed-cycle refrigeration have been assembled to enhance the non-ambient powder diffraction facilities at the Synchrotron Radiation Source, Daresbury Laboratory. The commissioning of the high- and low-temperature devices on the high-resolution powder diffractometer of Station 2.3 is described. The combined temperature range provided by the furnace/cryostat is 10–1500 K. Results from Fe and NH4Br powder samples are presented to demonstrate the operation of the apparatus. The developments presented in this paper are applicable to a wide range of other experiments and diffraction geometries.

scholarly journals PENGARUH FOULING TERHADAP LAJU PERPINDAHAN PANAS PADA SUPERHEATER BOILER CFB PLTU SEBALANG

Power Plant ◽  
2018 ◽  
Vol 6 (1) ◽  
pp. 48-57
Author(s):  
Redaksi Tim Jurnal
Keyword(s):  
High Temperature ◽  
Fly Ash ◽  
Chemical Composition ◽  
Low Temperature ◽  
Fluidized Bed ◽  
Flue Gas ◽  
Circulating Fluidized Bed

Salah satu unit yang paling penting dalam produksi uap pada PLTU adalah boiler. Salah satu boileh jenis PLTU sering digunakan adalah boiler tipe CFB (Circulating Fluidized Bed), dan jenis bahanbakar batu bara yang digunakan banyak mengandung zat basa. Superheater merupakan salah satu komponen terpenting pada boiler. Superheater berfungsi untuk memanaskan uap agar kandungan energi panas dan kekeringannya bertambah sehingga menjadi uap superheat. Permasalahan yang sering terjadi pada superheater yaitu penumpukan abu (fouling) yang terjadi pada tube superheater tersebut. Unsur yang paling berpengaruh pada fouling adalah material basa terutama kadar Na2O. Bila kadar abu batubara banyak, kemudian unsur basa dalam abu juga banyak, ditambah kadar Na2O yang tinggi, maka fouling akan mudah terjadi. Kadar sulfur yang tinggi cenderung mendorong timbulnya fouling. Fouling dapat menyebabkan penurunan laju perpindahan panas antara flue gas dengan steam pada superheater. Potensi fouling dapat diukur menggunakan suatu persamaan, tetapi persamaan tersebut hanya memperhitungkan chemical composition dari batubara tersebut. Dari penelitian diperoleh hasil terjadi penurunan laju perpindahan panas untuk high temperature superheater dari sootblowing satu ke sootblowing selanjutnya sebesar 511,8458 kW atau sekitar 3,012%. Sedangkan penurunan laju perpindahan panas untuk low temperature superheater dari sootblowing satu ke sootblowing selanjutnya sebesar 3421,506 kW atau sekitar 13,028%. Unsur yang paling berpengaruh pada fouling adalah material basa terutama Na, yang dalam hal ini kadar Na2O. Potensi terjadinya fouling yang dihitung dari data analisis fly ash menunjukkan nilai potensi fouling sebesar 4,0069 yang masuk dalam kategori potensi fouling tinggi pada fly ash lignit.

(Cu/NCNTs): a new high temperature technique to prepare a recyclable nanocatalyst for four component pyridine derivative synthesis and nitroarenes reduction

2016 ◽  
Vol 40 (10) ◽  
pp. 8535-8542 ◽  
Author(s):  
Gurpreet Kour ◽  
Monika Gupta ◽  
B. Vishwanathan ◽  
K. Thirunavukkarasu
Keyword(s):  
High Temperature ◽  
Pyridine Derivative ◽  
Furnace Heating ◽  
High Temperature Furnace ◽  
N Doping ◽  
Temperature Furnace

N-Doping has been successfully achieved using a new and simple high temperature furnace heating technique to synthesize a Cu/NCNTs nanocatalyst.

Spectral Interference in Antimony Analysis with High Temperature Furnace Atomic Absorption

1978 ◽  
Vol 11 (10) ◽  
pp. 855-868 ◽  
Author(s):  
Hideo Yamada ◽  
Koichi Uchino ◽  
Hideaki Koizumi ◽  
Tamotsu Noda ◽  
Kazuo Yasuda
Keyword(s):  
High Temperature ◽  
Atomic Absorption ◽  
Spectral Interference ◽  
High Temperature Furnace ◽  
Temperature Furnace

EAF Gas Waste Heat Utilization and Discussion of the Energy Conservation and CO2 Emissions Reduction

2016 ◽  
Vol 35 (2) ◽  
pp. 195-200 ◽  
Author(s):  
Ling-zhi Yang ◽  
Rong Zhu ◽  
Guo-hong Ma
Keyword(s):  
High Temperature ◽  
Energy Saving ◽  
Waste Heat ◽  
Hot Metal ◽  
Coal Gas ◽  
Heat Utilization ◽  
High Temperature Furnace ◽  
Metal Ratio ◽  
Waste Heat Utilization ◽  
Temperature Furnace

AbstractAs a large number of energy was taken away by the high temperature furnace gas during the EAF smelting process, a huge economic and environmental benefits would obtained to recycle and utilize. In this paper, the energy of the EAF was analyzed theoretically with the hot metal ratio of 50%. Combined with the utilization of the gas waste heat during the scrap preheating, electricity generation, production of steam and production of coal gas processes, the effect of the energy saving and emission was calculated with comprehensive utilization of the high temperature furnace gas. An optimal scheme for utilization of the waste heat was proposed based on the calculation. The results show that the best way for energy saving and carbon reduction is the production of coal gas, while the optimal scheme for waste heat utilization is combined the production of coal gas with the scrap preheating, which will save 170 kWh/t of energy and decrease 57.88 kg/t of carbon emission. As hot metal ratio in EAF steelmaking is often more than 50%, which will produce more EAF gas waste heat, optimizing EAF gas waste heat utilization will have more obvious effect on energy saving and emission reduction.

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