Device for reusing flue gas from quenching furnace and method for reusing it

Abstract

The invention discloses a quenching furnace flue gas reusing device and a reusing method based on the device. The device includes: a quenching furnace and a tempering furnace arranged side by side, a flue gas pipeline is arranged in the quenching furnace, and the tempering furnace The bottom is provided with a horizontal flue gas main pipe, and the horizontal flue gas main pipe extends out of the tempering furnace. One end of the flue gas pipe is provided with a three-way pipe, and the three-way pipe is provided with a quenching furnace chimney and a connecting pipe. An air mixing pipe is provided in the middle of the pipe, and a high-temperature suction fan is provided at the end of the connecting pipe, and the high-temperature suction fan communicates with one end of the horizontal flue gas main pipe. The beneficial effects of the present invention are mainly reflected in that most of the waste heat of quenching furnace flue gas that was originally emptied and wasted can be economically and efficiently reused in the low-temperature tempering furnace, which can not only preheat the low-temperature steel plate entering the furnace, but also save When the low-temperature furnace has no external flue gas to preheat the steel plate, it also needs to burn coal gas to generate heat to heat the steel plate. Additional energy consumption.

Description

technical field [0001] The invention relates to a device for reusing flue gas from a quenching furnace and a reusing method based on the device, belonging to the category of high-efficiency utilization of waste heat of flue gas in the field of energy saving. Background technique [0002] Under the background that the whole world is pursuing economic development and environmental coordination, flue gas secondary utilization technology is widely used in the industrial field to recover waste heat, save energy and reduce emissions. There are a large number of high-temperature industrial furnaces in iron and steel enterprises. The current mature flue gas utilization plan is to partially recover the high-temperature flue gas from the furnace through a heat exchanger to preheat the combustion-supporting air, and then install a waste heat boiler to further absorb the remaining flue gas waste heat. Used to produce steam, hot water or generate electricity. Although this flue gas util...

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Problems solved by technology

[0007] In addition, when the tempering furnace is switched from high-temperature tempering to low-temperature tempering, the furnace temperature will be reduced from 600-700°C to about 200°C, and the huge heat storage of the furnace body will cause the furnace switching time to be too long

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