Quenching furnace flue gas reusing device and reusing method based on quenching furnace flue gas reusing device

Abstract

The invention discloses a quenching furnace flue gas reusing device and a reusing method based on the quenching furnace flue gas reusing device. The device comprises a quenching furnace and a tempering furnace which are arranged side by side; a flue gas pipeline is mounted in the quenching furnace; a transverse flue gas main pipe is disposed at the bottom of the tempering furnace and extends towards the outside of the tempering furnace; a three-way pipe is disposed at one end of the flue gas pipeline and provided with a quenching furnace chimney and a connecting pipeline; an air mixing pipe is disposed in the middle of the connecting pipeline; a high-temperature suction fan is disposed at the end of the connecting pipeline; the high-temperature suction fan is communicated with one end of the transverse flue gas main pipe. The quenching furnace flue gas reusing device and the reusing method based on the quenching furnace flue gas reusing device have the beneficial effects that large part of waste heat of original exhausted wasted quenching furnace flue gas can be reused economically and efficiently in the low-temperature tempering furnace so that a low-temperature steel plate entering the furnace can be pre-heated and extra energy consumption caused by burning of coal gas which is needed to generate heat to heat the steel plate when the low-temperature furnace does not have external flue gas to pre-heat the steel plate can be omitted.

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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