An electric furnace flue gas waste heat full vaporization, regenerative recovery system and its working method

Abstract

Disclosed is an electric furnace flue gas waste heat complete vaporization and heat accumulation type recovery system. An intermittent high-temperature flue gas heat accumulation device and a heat convection superheater are connected between a combustion settling chamber and a heat convection evaporator in sequence. The intermittent high-temperature flue gas heat accumulation device and the heat convection superheater are additionally arranged in an existing flue gas waste heat recovery system, wherein the intermittent high-temperature flue gas heat accumulation device is applied to a high-temperature flue gas outlet of the combustion settling chamber. When the flue gas flow and temperature fluctuation of an electric furnace happens due to feeding, stable output of the flue gas temperature is achieved through a heat absorption and release reaction of a heat accumulator. When normal smelting is conducted, the temperature of flue gas generated by the electric furnace is high, and part of heat of the flue gas is absorbed by the heat accumulator after the flue gas passes through the intermittent high-temperature flue gas heat accumulation device. When feeding of the electric furnace is conducted, the temperature of flue gas generated by the electric furnace is low, the low-temperature flue gas absorbs the heat in the heat accumulator again after the flue gas passes through the intermittent high-temperature flue gas heat accumulation device, then a stable heat accumulation function is fulfilled, and the situation that high-quality steam is generated by follow-up heating is guaranteed.

Description

technical field [0001] The invention relates to an electric furnace flue gas waste heat full vaporization, regenerative recovery system and a working method thereof, belonging to the technical field of energy utilization in electric furnace smelting. Background technique [0002] Traditional electric furnace flue gas is cooled by circulating water, which not only does not recover waste heat resources but also consumes a lot of electric energy, while the existing electric furnace flue gas waste heat recovery has been implemented. However, at present, there are many problems in the recovery efficiency, safety, matching with the smelting conditions of the electric furnace, and the quality of the steam recovered by the system. These problems have restricted the popularization and development of electric furnace flue gas waste heat technology. [0003] The recovery efficiency of the electric furnace flue gas waste heat recovery system is low. The main problem is that the existin...

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Problems solved by technology

[0004] In terms of safety, the existing waste heat recovery system does not consider the problem of flue gas heat storage, so the convective evaporator in the waste heat recovery system is designed and manufactured according to the peak temperature of the electric furnace flue gas at 1000°C, which requires extremely high processing and manufacturing of the waste heat recovery system, and Frequent fluctuations of flue gas can easily lead to problems such as open welding of welding points, which will have a great impact on the safety of system operation

Moreover, the existing waste heat recovery system is designed to mix water cooling and vaporization cooling, so there are many auxiliary equipment and complex system layout, and it is difficult to arrange multiple media pipelines

[0005] In terms of the quality of the steam recovered by the waste heat recovery system, the current electric furnace flue gas waste heat recovery system is determined by the nature of electric furnace smelting, and the flue gas is in a state of periodic fluctuation. The flue gas has a high temperature period and a low temperature period. Produce steam without continuous steam superheating

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