scholarly journals Characteristics of Oxyfuel and Air–Fuel Combustion in an Industrial Water Tube Boiler

2014 ◽  
Vol 35 (16-17) ◽  
pp. 1394-1404 ◽  
Author(s):  
Rached Ben-Mansour ◽  
Mohamed A. Habib ◽  
Medhat A. Nemitallah ◽  
Mohammed Rajhi ◽  
Kabir A. Suara
Keyword(s):  
Fuel Combustion ◽  
Industrial Water ◽  
Water Tube

WET BURNING – THE MODERN TREND IN ENVIRONMENTAL BENIGN FUEL COMBUSTION AND IN SOLUTION TO THE PROBLEM OF SUSTAINABLE DEVELOPMENT OF THE POWER GENERATION

2018 ◽  
pp. 96-117 ◽  
Author(s):  
B. S. Soroka
Keyword(s):  
Numerical Simulation ◽  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Fuel Combustion ◽  
Transport Processes ◽  
Cfd Modeling ◽  
Furnace Chamber ◽  
Modern Trend ◽  
Atmospheric Air ◽  
No Formation

The article considers the role and place of water and water vapor in combustion processes with the purpose of reduction the effluents of nitrogen oxides and carbon oxide. We have carried out the complex of theoretical and computational researches on reduction of harmful nitrogen and carbon oxides by gas fuel combustion in dependence on humidity of atmospheric air by two approaches: CFD modeling with attraction of DRM 19 chemical kinetics mechanism of combustion for 19 components along with Bowman’s mechanism used as “postprocessor” to determine the [NO] concentration; different thermodynamic models of predicting the nitrogen oxides NO formation. The numerical simulation of the transport processes for momentum, mass and heat being solved simultaneously in the united equations’ system with the chemical kinetics equations in frame of GRI methane combustion mechanism and NO formation calculated afterwards as “postprocessor” allow calculating the absolute actual [CO] and [NO] concentrations in dependence on combustion operative conditions and on design of furnace facilities. Prediction in frame of thermodynamic equilibrium state for combustion products ensures only evaluation of the relative value of [NO] concentration by wet combustion the gas with humid air regarding that in case of dry air – oxidant. We have developed the methodology and have revealed the results of numerical simulation of impact of the relative humidity of atmospheric air on harmful gases formation. Range of relative air humidity under calculations of atmospheric air under impact on [NO] and [CO] concentrations at the furnace chamber exit makes φ = 0 – 100%. The results of CFD modeling have been verified both by author’s experimental data and due comparing with the trends stated in world literature. We have carried out the complex of the experimental investigations regarding atmospheric air humidification impact on flame structure and environmental characteristics at natural gas combustion with premixed flame formation in open air. The article also proposes the methodology for evaluation of the nitrogen oxides formation in dependence on moisture content of burning mixture. The results of measurements have been used for verification the calculation data. Coincidence of relative change the NO (NOx) yield due humidification the combustion air revealed by means of CFD prediction has confirmed the qualitative and the quantitative correspondence of physical and chemical kinetics mechanisms and the CFD modeling procedures with the processes to be studied. A sharp, more than an order of reduction in NO emissions and simultaneously approximately a two-fold decrease in the CO concentration during combustion of the methane-air mixture under conditions of humidification of the combustion air to a saturation state at a temperature of 325 K.

Modeling of Solid Fuel Combustion in Furnaces with a Circulating Fluidized Bed

2008 ◽  
Vol 39 (1) ◽  
pp. 65-78
Author(s):  
Yu. S. Teplitskii ◽  
V. A. Borodulya ◽  
V. I. Kovenskii ◽  
E. P. Nogotov
Keyword(s):  
Fluidized Bed ◽  
Solid Fuel ◽  
Circulating Fluidized Bed ◽  
Fuel Combustion ◽  
Solid Fuel Combustion

FLUE GAS PURIFICATION FROM SULFUR OXIDES AND ASH DURING SOLID FUEL COMBUSTION IN LOW-POWER BOILERS

2020 ◽  
Vol 21 (4) ◽  
pp. 355-374
Author(s):  
S. V. Plashykhin ◽  
T. V. Bojko ◽  
D. N. Skladannyy ◽  
Ju. A. Zaporozhets ◽  
Artem S. Safiants
Keyword(s):  
Low Power ◽  
Solid Fuel ◽  
Flue Gas ◽  
Fuel Combustion ◽  
Sulfur Oxides ◽  
Gas Purification ◽  
Solid Fuel Combustion ◽  
Flue Gas Purification

Modifikasi Steam Boiler pada Alat Sterilisasi untuk Minimasi Kontaminan Mikroba Media Tumbuh Jamur (Baglog)

2017 ◽  
Vol 11 (2) ◽  
pp. 131-138
Author(s):  
Hermanto ,SP
Keyword(s):  
Stainless Steel ◽  
Steam Boiler ◽  
Water Tube

Pada umumnya petani jamur dalam melakukan proses sterilisasi masih menggunakan alat sederhana berupa bejana dari drum bekas yang dipanaskan dengan tungku/gas elpiji, sehingga suhu tidak tercapai (< 100 oC), waktu pemanasan terlalu lama (6-8 jam) dan lebih 30% terkontaminasi oleh jamur liar. Tujuan dari modifikasi alat ini adalah mengetahui suhu dan tekanan yang optimal pada proses sterilisasi media tumbuh jamur (Baglog), sehingga  kontaminasi jamur liar dapat berkurang, kapasitas produksi dapat ditingkatkan dan waktu sterilisasi baglog dapat dipersingkat. Metode yang digunakan  adalah pertama melakukan desain gambar alat, kemudian pembuatan alat, uji coba dan unjuk kerja alat. Modifikasi Alat, terdiri dari 2 (dua) Unit yaitu Boiler dan Sterilisator. Boiler adalah bejana tertutup dimana panas pembakaran dialirkan ke air sampai terbentuk air panas atau steam, kemudian digunakan untuk mengalirkan panas ke suatu proses. Unit  boiler yang digunakan tipe  Water Tube Boiler, tipe ini  air umpan boiler  mengalir melalui pipa–pipa masuk ke dalam bejana. Air yang tersikulasi dipanaskan oleh gas pembakar membentuk steam pada daerah uap dalam bejana. Unit  boiler terbuat dari  plat baja tebal 3,5 mm, tinggi 125 cm dan diameter 57 cm, dilengkapi dengantermometer,presure gauge,savety valve,kran pengalir uap panas. Bagian dalam bawah terdapat pipa pemanas air dari pipa schedule 1 inch, yang dipasang horizontal 20 buah. Di bagian samping dipasang pipa kaca tebal 5 mm untuk memantau level air. Kaki dari besi baja Kanal U/ UNP  tinggi 30 cm. Sterilisator atau autoklaf ; alat pemanas tertutup untuk mensterilisasi suatu benda menggunakan uap bersuhu dan bertekanan tinggi (1210C, 15 lbf/in2) selama kurang lebih 15 menit. Suhu yang tinggi inilah yang akan membunuh microorganisme. Unit sterilisator dari plat stainless steel tebal 2 mm, tinggi 150 cm dan diameter 120 cm. Bagian dalam diberi plat stainless steel vorporasi tebal 1,3 mm dan rak dorong dari kawat stainless steel setinggi 27 cm. Bagian atas dipasang   termometer. Kaki dari baja siku  setinggi  50 cm. Hasil uji coba unjuk kerja alat diperoleh  kapasitas stelisator 350-500 baglog, suhu  berkisar 100-120 0C tekanan 1,5-1,9 bar, waktu tercapainya suhu pada alat 2-3 jam.

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