An online pre-cleaning device for medium and low temperature flue gas in a rotary hearth furnace

Abstract

The invention relates to a medium and low temperature smoke online pre-ash-removal device of a rotary hearth furnace. The medium and low temperature smoke online pre-ash-removal device of the rotary hearth furnace comprises a smoke main pipe, a settling chamber, a first valve, a second valve, a bypass pipe and a third valve, wherein the first end of the smoke main pipe is connected with an air outlet of an external preheating furnace; the second end of the smoke main pipe is connected with an air inlet of an external heat exchanger; the position, close to the first end, of the smoke main pipe is provided with the first valve; the position, close to the second end, of the smoke main pipe is provided with the second valve; the position, between the first valve and the second valve, of the smoke main pipe is connected with the settling chamber; a first opening is formed in the position, between the first end and the first valve, of the smoke main pipe; a second opening is formed in the position, between the second end and the second valve, of the smoke main pipe; the two ends of the bypass pipe are in closed connection with the first opening and the second opening respectively; the position, close to the first valve, of the bypass pipe is provided with the third valve.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to an online pre-cleaning device for low-temperature flue gas in a rotary hearth furnace. Background technique [0002] The temperature of the flue gas output from the outlet of the rotary hearth furnace is as high as 900 ℃ ~ 1100 ℃. In order to efficiently utilize the waste heat of the flue gas, the existing production line of the rotary hearth furnace is equipped with a heat exchanger, which can be used to transfer the heat required by the rotary hearth furnace. The air is preheated to 300 ℃ ~ 600 ℃ to reduce the energy consumption of the production line. The heat exchange process is as follows: the temperature of the flue gas from the rotary hearth furnace is 900°C-1100°C, it is cooled to 600°C-800°C by the waste heat boiler, and the exhaust gas at 600°C-800°C is exchanged by the heat exchanger. The temperature drops to 180°C to 250°C. Since most of the rotary hearth furnaces are prod...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of high cost caused by the fact that the rotary hearth furnace production line in the prior art requires multiple sets of heat exchangers to solve the problem of dust removal, thereby providing a dust removal device with less investment and easy operation

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