System used for sinter ore cooling and sensible heat efficient recycling

Abstract

A system used for sinter ore cooling and sensible heat efficient recycling comprises a stepping sintering machine used for sintering mixed iron ore materials, a vertical cooling kiln used for cooling sinter ore which is sintered and crushed, a feeding mechanism arranged between a discharging opening of the stepping sintering machine and a feed inlet of a material receiving funnel of the vertical cooling kiln, a gravity dust remover, a high-temperature smoke unit, a discharging machine, a belt conveyer and a vertical double-pressure waste heat boiler used for heat exchange, wherein the gravity dust remover and the high-temperature smoke unit are connected with a gas outlet in the upper portion of the vertical cooling kiln, and the discharging machine and the belt conveyer are arranged on a discharging opening of the vertical cooling kiln. A gas outlet of the vertical double-pressure waste heat boiler is connected with a gas inlet of a low-temperature gas unit, a gas outlet of the low-temperature gas unit is connected with a gas inlet in the lower portion of the vertical cooling kiln, and a heat exchange pipe of the vertical double-pressure waste heat boiler is connected with a power generation system. By means of the system, the sinter ore and cooling air can flow reversely in a closed space, cooling time of the sinter ore is prolonged, heat exchange is sufficient, heat efficiency of the system is greatly improved, and efficient recycling of sensible heat of the sinter ore is achieved.

Description

technical field [0001] The invention relates to cooling and sensible heat recovery of sintered ore in the iron and steel industry. In particular, it relates to a system for sinter cooling and sensible heat efficient recovery and utilization that can replace traditional on-machine cooling to realize sintering. Background technique [0002] The energy consumption of the sintering process in the iron and steel production process accounts for about 10% to 20% of the total energy consumption, which is the second largest energy consumption process after the ironmaking process. In the energy consumption of sintering, the sensible heat of sintering ore accounts for about 30% of the total energy consumption of sintering, and the recovery ratio of this part of energy consumption is less than 30%, which wastes a lot of energy, has huge recovery space, and has great market potential. There are three kinds of sinter cooling methods at present: one is on-machine cooling, that is, the sin...

AI Technical Summary

Problems solved by technology

[0004] 1. Serious air leakage and high power consumption

The three cooling methods are to place the sinter on the trolley, and cool the sinter by blowing or drawing air. The sealing problem between the trolley and the bellows is difficult to solve. Generally, the air leakage rate is more than 20%, or even as high as 50%. , increased cooling power consumption

[0005] 2. Insufficient heat exchange

Cross-flow heat exchange between sinter and cooling air in belt cooler or ring cooler, the heat transfer effect is poor; the accumulation height of sinter material layer is low, the heat exchange time between sinter and cooling air is short, and the heat exchange is insufficient

[0006] 3. Low utilization efficiency of waste heat

Because the two ends of the cooling machine cannot be sealed, a large amount of wild wind is mixed in. Since the wild wind does not pass through the sintered material layer, it not only increases the power and power consumption of the fan, but also greatly reduces the temperature of the flue gas after heat exchange; In the existing sintering machine waste heat power generation system, the air is generally taken from the higher temperature sections I and II of the belt cooler or ring cooler, and the temperature difference between the sintering ore and the cooling air heat exchange end is large, the flue gas temperature is low, and the working capacity is lost. Large, low waste heat utilization efficiency

[0007] 4. Large fluctuations in waste heat parameters

[0008] 5. Regardless of the belt cooler or the annular cooler, they are bulky, high investment, high energy consumption, heavy equipment maintenance workload, and long project investment recovery period

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