The Simulation Study On Combustion Of The Blast Furnace Gas Engine

Blast furnace gas is one kind of high-quality, efficient and clean fuel. But it is also with highly toxic. The acid pollution and dust pollution caused by coal-fired boiler on the environment can be effectively solved if we can make good use of the BFG. The waste of energy can be fully and effectively utilized to improve the environment with good social and economic benefits.The test methods of combustion characteristics were summarized. The major influencing factors in the laminar flow combustion experiments were fuel properties, equivalence ratio, initial temperature, initial pressure and additives. The methods of image interpretation and image processing of high-speed camera were put forward.The constant volume combustion experiments of BFG were experimented in the constant volume combustion bomb. The direct photographic technique was used to get flame propagation process under laminar condition. The pressure and temperature of BFG could be simulated to accord with the end of the compression stroke of engine. The pressure, flame propagation speed and Markstein lengths were changed with the change of components, equivalence ratio, initial pressure and initial temperature. The influences to combustion properties of BFG under different initial conditions were studied to provide the design basis of BFG engine. The results show that the stability of flame propagation was better nearby theoretical equivalence ratios. The influence to the laminar flame propagation speed without stretching was weaker than the stretched flame propagation speed. The laminar flame propagation speed without stretching was slower than the stretched flame propagation speed at same equivalence ratios. The Markstein lengths and flame propagation speed improved which means the stability improved with the increase of carbon monoxide in BFG The influence of BFG components was greater than equivalence ratios. The stretched flame propagation speed was slower with the increase of pressure. Pressure did not play a major role in the stability of the flame. The flame front became unstable with increase of flame propagation speed when the premixed gas initial temperature was increased.In this paper, the combustion characteristics of BFG have been studied by the experimental research of premixed laminar combustion characteristics in visualization of Constant Volume Combustion Bomb. The combustion data can provide a theoretical basis for blast furnace gas engine with highly efficient.