AOD converter flue gas waste heat recovery apparatus

Abstract

The invention provides an AOD convertor flue gas waste heat recovery apparatus comprising a high-temperature flue gas evaporation cooling part and a low-temperature flue gas waste heat recovery part. The high-temperature flue gas evaporation cooling part comprises a fire hole fixed segment smoke canal, a middle I segment smoke canal, a middle II segment smoke canal, a middle III segment smoke canal, an end segment smoke canal and a steam dome which are communicated one by one, and the middle I segment smoke canal, the middle II segment smoke canal, the middle III segment smoke canal, the end segment smoke canal, the steam dome and the ascending pipe and the corresponding descending pipe which are communicated with the upper side thereof together form a natural cycle system; the low-temperature flue gas waste heat recovery part comprises a pre-heater, a heat exchanger, a coal economizer, a deaerator and a water supply pump, wherein, the pre-heater and the deaerator form a natural loop through the connected ascending pipe and descending pipe for heating and deoxidizing the water in the deaerator and saving the steam consumption, the deoxidized water is then pumped by the water supply pump to the steam dome through the coal economizer, therefore, smoke temperature can be reduced sufficiently and heat can be recovered, in addition, because no recirculating pump is added to the heat exchanger singly, the electrical energy is saved.

Description

technical field [0001] The invention relates to a cooling waste heat recovery device in the technical field of iron and steel metallurgy and energy saving, in particular to an AOD converter flue gas waste heat recovery device. Background technique [0002] In the traditional converter steelmaking mode, the furnace gas volume is small, the flue gas temperature is high, the flue gas temperature fluctuates greatly, and the dust content is high, so the converter flue gas is generally treated with water cooling. Take the AOD converter as an example, please refer to figure 1 As shown, the flue gas produced by the AOD converter smelting is extracted from the top of the furnace, cooled by the water-cooled flue, and then cooled to about 150°C by the mechanical air cooler or spray cooler, then purified by the bag filter, and passed by the fan. The chimney vents to atmosphere. [0003] Because the cooling equipment for traditional AOD converter flue gas treatment is industrial water ...

AI Technical Summary

Problems solved by technology

In order to recover the heat of AOD converter flue gas, reduce the energy consumption index per ton of steel, and improve the circular economic benefits of the whole plant, relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general The product does not have an appropriate structure to solve the above problems, which is obviously a problem that relevant industry players are eager to solve

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