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TECHNOLOGY

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    Anike is aiming at the development of internationally advanced high-temperature, long-life, low-energy hot-blast furnace technology, and is committed to the research and application of key technologies for ultra-large blast furnace high air temperature. Through the thermal calculation of the hot blast stove, resistance calculation, flow field analysis, three-dimensional design, and the use of computer fluid dynamics (CFD) to comprehensively analyze the working mechanism of the hot blast stove, the world's first top-fired hot blast stove was established. The simulation comprehensive test platform forms the core technology of the 4th generation of new top-fired hot blast stove (Annex type).

    The 4th generation of new top-burning hot blast stove (Annex type) R&D system

    Digital Simulation of the 4th Generation of New Type Top Burning Hot Air Furnace {An Nike Type)

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    The 4th generation of the new top-burning hot blast stove (Annex type) was developed using Gambit software, and the corresponding physical model was established and meshed. The total number of furnace grids reached 1.3 million, ensuring the accuracy of the calculation.

    CFD calculation result

    Temperature field calculation

    The test hollow gas is double preheated, and the maximum temperature in the hot air furnace is measured at 1380 ° C, and the surface temperature of the lattice brick at the end of the air supply is between 1265 ° C and 1296 ° C, which can meet the demand of 1250 ° C for air supply.

    In the test, the maximum CO concentration on the surface of the checker brick was measured, 0.005%, and the three-dimensional hybrid burner could ensure complete combustion under a small air excess coefficient, thereby increasing the combustion temperature and the supply air temperature.

    Cold state and hot state simulation experiment of the 4th generation new top-burning hot blast stove (Anikeke type)

    In order to verify the correctness of the numerical extreme results, according to the initial conditions and boundary conditions of the design prototype parameters and numerical calculations, the company simulated the 2500m3 blast furnace hot blast stove and established the 4th generation new top-fired hot blast stove according to the ratio of 1:10 (An Nike ()) The overall simulation experimental device.

    Taking the Shougang Jingtang 5500m3 top-fired hot blast stove as the prototype, the company established two hot-test hot blast stoves according to the ratio of 1:5, adopting the work system of “one burn and one send”, and the hot state simulates the actual working process of the hot blast stove. On the two hot test hot blast stoves, 289 temperature measuring points and corresponding gas flow measuring points were set, and the hot air furnace hot state test was carried out several times. Through the on-line detection and test of the temperature change of the regenerator grid brick in the hot air furnace combustion and air supply state, combined with the pressure detection and the smoke component detection, the temperature field distribution and combustion condition in the test hot blast stove are analyzed. The hottest test of the hot blast stove verified the numerical calculation results of the combustion process and heat transfer process of the top-fired hot blast stove, which provided theoretical and experimental basis for the optimal design of the actual hot blast stove and rational allocation of refractory materials.