Method and system for modeling and energy consumption optimization of spherical hot blast stove

Abstract

The invention discloses a method and system for ball type hot blast furnace sintering process modeling and energy consumption optimization, and can realize purposes of energy saving and cost reduction. The method includes the steps: S1, according to heat transfer and fluid mechanics principles, establishing a regenerative chamber transient heat transfer model of a hot blast furnace in two stages of furnace sintering and air feeding, and providing boundary conditions and initial conditions for model calculation; S2, calculating the regenerative chamber transient heat transfer model, according to the calculated results of the regenerative chamber transient heat transfer model and with combination of a working system of the hot blast furnace, establishing an optimization model taking the coal gas volume as an optimized target and meeting the dome temperature, the exhaust gas temperature, the hot air flow quantity and temperature, the thermal efficiency and other constraint conditions by a method of time-dividing optimization of the coal gas flow quantity; S3, solving the optimization model, to obtain a change curve of the coal gas flow quantity having minimum energy consumption along with the time; and S4, controlling the coal gas flow quantity of the ball type hot blast furnace sintering process according to the change curve of the coal gas flow quantity along with the time.

Description

technical field [0001] The invention relates to the technical field of hot blast stoves, in particular to a method and system for modeling the firing process of a spherical hot blast stove and optimizing energy consumption. Background technique [0002] The hot blast stove is an important part of the blast furnace ironmaking system. It provides high temperature hot air for the blast furnace ironmaking process and is the main energy source of the blast furnace. According to statistics, every time the hot air temperature increases by 100°C, the combustion temperature of the tuyeres can be increased by 20-300°C, the output can be increased by 3%-5%, the coke ratio can be reduced by 4%-7%, and the injection of pulverized coal can be increased by 15-40Kg / t, so the hot blast stove plays a very important role in the realization of energy saving and emission reduction in the blast furnace ironmaking process. The hot blast stove is mainly divided into two working stages: furnace fi...

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Problems solved by technology

Although the patent adopts the rapid combustion method to save the combustion time, it does not consider the heat storage efficiency, which causes a waste of gas

And due to the time lag of the hot blast stove firing process, the method of adjusting the hot blast stove according to the change of the excess air coefficient cannot change the firing status in time, resulting in unstable firing

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