Dry dedusting and sensible heat recovery system for electric furnace flue gas

Abstract

The invention discloses a dry dedusting and sensible heat recovery system for electric furnace flue gas. The system comprises a main line and parallel branches, wherein the main line comprises a front main line and a back main line; the front main line comprises a primary settling chamber, an evaporation cooling flue and a secondary settling chamber which are connected in turn; the back main line comprises a low-temperature deduster, a variable frequency induced draft fan and a chimney which are connected in turn; the parallel branches comprise a first branch and a second branch which are arranged in parallel; the first branch is provided with a spray cooling tower; and the second branch comprises a high-temperature deduster and a waste heat boiler which are connected in turn. In the system, the evaporation cooling flue in a square channel form is adopted, so that a flue gas circulation area is increased, the sensible heat of the flue gas can be recovered effectively, and part of high-temperature flue gas can be captured; the form that the spray cooling tower and the waste heat boiler are connected in parallel is adopted so as to ensure the normal operation of an electric furnace; and a divisional dedusting mode is adopted so as to effectively improve the heat efficiency of a heat exchanger and ensures the capture rate of the flue gas.

Description

technical field [0001] The invention relates to the field of electric furnace steelmaking, in particular to an electric furnace flue gas dry dust removal system and a sensible heat recovery system thereof. Background technique [0002] In a typical electric furnace steelmaking production process, the flue gas temperature fluctuates between 100 and 1300°C, and the flue gas flow and temperature of the electric furnace vary with the stages of primary feeding, smelting, secondary feeding, smelting, and tapping in the smelting cycle. fluctuate periodically. At the same time, the flue gas also contains 100-150g / m 3 The dust, the dust is fine and sticky, such as the dust discharged from the electric furnace mouth, the particle size is less than 10μm, accounting for more than 80%. [0003] There is currently no technology and equipment that can effectively utilize the waste heat of flue gas that contains viscous fine dust under fluctuating conditions of medium and low temperature....

AI Technical Summary

Problems solved by technology

At present, waste heat boilers are also used to recover the heat of electric furnace flue gas, but the effect is not ideal, because the electric furnace flue gas is unstable and has a high ash content, and the problem of contamination of the heating surface is difficult to solve

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