Numerical Modeling and Optimization of a Natural Gas and Coke Oven Gas Mixing Flow Field

2016 ◽  
Author(s):  
Xiang Liu ◽  
Bin Wu ◽  
Guangwu Tang ◽  
Yuchao Chen ◽  
Armin K. Silaen ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Flow Rate ◽  
Cfd Simulation ◽  
Coke Oven ◽  
Thermal Control ◽  
Pipeline System ◽  
Coke Oven Gas ◽  
Computational Fluid Dynamics Cfd ◽  
Integrated Steel Plant

Coke oven gas (COG) is a by-product of the coke making process. In the steelmaking industry, COG is often injected along with natural gas as fuel into blast furnace to replace coke for cost reduction. For an integrated steel plant, NG is always more expensive than COG. Especially, NG is purchased externally, and COG is generated internally. To lower the total fuel cost, the operators always try to maximize COG usage and only use NG as supplement for thermal control. However, it is found that such simple concept could not be implemented successfully. Every time, as NG flow rate increases, the COG flow rate decreases automatically. As a result, total fuel supply is short than expected, and the blast furnace finally loses thermal stability. A comprehensive investigation was conducted. Computational fluid dynamics (CFD) was used to model the COG and NG pipeline system. It is identified that mixing of COG and NG has a critical impact. In the existing pipeline system, COG and NG is simply mixed at a joint where COG and NG meet. CFD simulation identified that the current mixing of COG and NG is not adequate, causing COG flow out of control as NG flow varies. A new design of COG and NG joint is developed by adding baffles to ensure the COG flow can be adjusted as needed.

Atmospheric Tests of a Full Scale Gas Turbine Burner Fed With Blast Furnace Gas and Coke Oven Gas

2019 ◽  
Author(s):  
Edoardo Bertolotto ◽  
Alberto Amato ◽  
Li Guoqiang
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Gas Turbine ◽  
Coke Oven ◽  
Full Scale ◽  
Flame Stability ◽  
Coke Oven Gas ◽  
Stability Range ◽  
Blast Furnace Gas ◽  
Inlet Conditions

Abstract The present paper describes atmospheric experimental tests of a new Ansaldo Energia full scale burner which was designed to burn fuels byproduct of steel making processes (mixtures of Blast-Furnace Gas (BFG) and Coke-Oven Gas (COG)), characterized by very low heating values (LHV∼2–3.5 MJ/kg) and very low stoichiometric air/fuel ratios (∼0.5–1 kg/kg). In particular, flame stability and blow-out margins were assessed for different burner variants and fuel compositions such as pure BFG, blends of BFG with increasing content of COG, and also a synthetic mixture of natural gas, hydrogen and nitrogen (NG/H2/N2). Except for pressure, all burner inlet conditions were simulated as in the actual gas turbine engine. The best performing burner among those tested demonstrated an excellent burning stability behavior over a wide operating range and stably burned pure BFG without any supplementary fuel. Furthermore, considering that in most operating concepts gas turbine engines for Ultra-Low BTU applications require a back-up fuel (such as oil, propane or natural gas) to ignite and ramp up or to perform load-rejections, the present atmospheric tests also assessed maneuvers to switch from natural gas operation to syngas operation. Also in this type of dual-fuel operation the burner demonstrated a wide flame stability range.

Operating Experience of Ansaldo V94.2 K Gas Turbine Fed by Steelworks Gas

2002 ◽  
Author(s):  
Federico Bonzani ◽  
Giacomo Pollarolo ◽  
Franco Rocca
Keyword(s):  
Blast Furnace ◽  
Natural Gas ◽  
Gas Turbine ◽  
Operating Experience ◽  
Coke Oven ◽  
Operating Conditions ◽  
Total Power ◽  
Dual Fuel ◽  
Coke Oven Gas ◽  
Blast Furnace Gas

ANSALDO ENERGIA S.p.A. has been commissioned by ELETTRA GLT S.p.A, a company located in Trieste, Italy for the realisation of a combined cycle plant where all the main components (gas turbine, steam turbine, generator and heat recovery steam generator) are provided by ANSALDO ENERGIA. The total power output of the plant is 180 MW. The gas turbine is a V94.2 K model gas turbine dual fuel (natural gas and steelworks process gas), where the fuel used as main fuel is composed by a mixture of natural gas, blast furnace gas and coke oven gas in variable proportions according to the different working conditions of the steel work plant. The main features adopted to burn such a kind of variability of fuels are reported below: • fuel as by product of steel making factory gas (coke oven gas “COG”, blast furnace gas “BFG”) with natural gas integration; • modified compressor from standard V94.2, since no air extraction is foreseen; • dual fuel burner realised based on Siemens design. This paper describes the operating experience achieved on the gas turbine, focusing on the main critical aspect to be overcome and on to the test results during the commissioning and the early operating phase. The successful performances carried out have been showing a high flexibility in burning with stable combustion a very different fuel compositions with low emissions measured all operating conditions.

Model Study of Shaft Injection of Reformed Coke Oven Gas in a Blast Furnace

2020 ◽  
Vol 34 (11) ◽  
pp. 15048-15060
Author(s):  
Ziguang Zhao ◽  
Xiaobing Yu ◽  
Yansong Shen ◽  
Yuntao Li ◽  
Hui Xu ◽  
...  
Keyword(s):  
Blast Furnace ◽  
Coke Oven ◽  
Coke Oven Gas ◽  
Model Study

Experimental Study of the Reforming of Methane with Carbon Dioxide over Coal Char

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Yanbing Li ◽  
Rui Xiao ◽  
Baosheng Jin ◽  
Huiyan Zhang
Keyword(s):  
Carbon Dioxide ◽  
Flow Rate ◽  
Fixed Bed ◽  
Coke Oven ◽  
Fixed Bed Reactor ◽  
Internal Diameter ◽  
Generation System ◽  
Coke Oven Gas ◽  
Surface Areas ◽  
Conversion Of Methane

As one of the fundamental issues of the new poly-generation system on the basis of gasification gas and coke oven gas, carbon dioxide reforming of methane experiments have been performed over coal chars derived from different parent coals in a lab-scale fixed-bed reactor (internal diameter 12 mm, length 700 mm). The char derived from TongChuan coal exhibited higher activity than other samples employed under the same conditions. After the reforming reaction, the char samples were covered with different amounts of carbon deposition which resulted in the surface areas decrease. As the flow rate of feed gas increased from 200 ml/min to 600 ml/min over the Xuzhou char sample at 1050 degrees Celsius, the conversion of methane decreased from 52.7% to 17.5% and the H2 /CO dropped from 0.75 to 0.55. While maintaining the flow rate of CO2 at 20ml/min at 1050 degrees Celsius, the mole ratio of reactants CH4/CO2 was varied from 1 to 1.75 which led to the H2/CO ratio increase from 0.75 to 1.2.

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