A method and device for multi-point recovery and efficient utilization of waste heat at the tail of a sintering machine

Abstract

Disclosed is a method for multi-point recovery and efficient utilization of waste heat at the tail of a sintering machine. The method includes the following steps that (1) a sintering mixture is put on a sintering machine trolley 1 for ignition, and sintering is started; (2) a radiation heat exchanger 3 is arranged above a turning lane 2 at the tail of the sintering machine, fed water enters the radiation heat exchanger 3 and carries out heat exchange with the empty trolley 1 above the turning lane 2, and the fed water is heated into low-temperature water; (3) convection heat exchangers 6 arearranged in the positions, corresponding to a plurality of air boxes 4 at the tail of the sintering machine, of a flue 5, the low-temperature water enters the convection heat exchangers 6 and carriesout heat exchange with high-temperature flue gas in the flue 5, and steam is generated after the low-temperature water is heated through the high-temperature flue gas; and (4) the steam is used by users. Through comprehensive multi-point recovery of the waste heat of the high-temperature flue gas and sensible heat of the turning lane at the tail of the sintering machine, the waste heat recovery and utilization rate is increased, and the operating environment nearby the turning lane is improved.

Description

technical field The invention relates to a sinter tail waste heat utilization device, in particular to a method and device for multi-point recovery and efficient utilization of sinter tail waste heat, belonging to the field of sinter production in the iron and steel industry. Background technique The waste heat resources carried by 1 ton of sinter ore in large and medium-sized iron and steel enterprises in my country are about 0.94-1.02GJ, accounting for about 65%-71% and 11%-12% of the total waste heat resources in the sintering process and iron and steel enterprises, respectively. Compared with large and medium-sized iron and steel enterprises in developed countries, the recovery rate of sinter waste heat resources in my country's iron and steel enterprises is lower than the average level of 30% to 45% of major foreign large and medium-sized iron and steel enterprises, only 28% to 30%. Therefore, the efficient recovery and utilization of sinter waste heat resources has bec...

AI Technical Summary

Problems solved by technology

(1) Waste heat recovery is not complete;

(2) The operating environment near the return lane is harsh;

(3) The adjustment method is not flexible, the quality of steam production is unstable, and it cannot meet the various heat needs of users

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