Waste heat recovery method for improving stability of unstable waste heat resource in sintering process

Abstract

The invention discloses a waste heat recovery method for improving the stability of an unstable waste heat resource in the sintering process. According to the waste heat recovery method, in the sintering process, temperature data of a plurality of wind chambers are acquired; a longitudinal temperature variation curve of sintering ores on a sintering ore deposit section is simulated according to the temperature data; the conveying speed of a conveyor belt and an air draft negative-pressure regulation valve of each wind chamber are regulated according to ingredient data and thickness of raw ores, so that the highest temperature point of the temperature variation curve is located at the last arranged wind chamber of the tail end of the sintering ore deposit section. By means of the method, the accuracy of the sintering final temperature reaches up to 90% or more, and the waste heat recovery rate can be increased by 5% or more; moreover, the quality of the sintering ores can be improved, and the return mire rate is reduced by 1% or more.

Description

technical field [0001] The invention relates to a stable waste heat recovery method for increasing unstable waste heat resources in the sintering process, and improves the heat and stability of the sintering waste heat recovery system by improving the control accuracy of the sintering end temperature control. Background technique [0002] In the process of iron and steel production, the energy consumption of the sintering process accounts for about 10% of the total energy consumption, ranking second only to the iron-making process. In the total energy consumption of the sintering process, nearly 50% of the heat energy is discharged into the atmosphere in the form of sensible heat of the flue gas of the sintering machine and the waste heat flue gas of the cooler. As a country with a large steel production capacity, the current power generation of sintering waste heat power generation projects in the country is only about 9kwh / t. The main reason is that the temperature fluctua...

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Problems solved by technology

However, if the sintering waste heat power generation wants to operate continuously and stably, it can only be operated in a low-load area with low temperature, which not only reduces the waste heat recovery effect, but also reduces the operation rate of the waste heat recovery system (when the load is lower than 25% of the rated value, the system shuts down )

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