A device for cooling circulating water of blast furnace by using low-temperature residual heat of sintering

Abstract

The invention provides a device and method used for cooling blast furnace circulating water through sintering low-temperature exhaust heat. The device comprises a sintering area and a blast furnace area. The sintering area comprises a sintering machine big flue in which low-temperature smoke is generated, the third section and the fourth section of a ring cooling machine, two sets of smoke-type lithium bromide refrigerators, a circulating water device and a water collecting box. The circulating water device and the water collecting box are commonly used. The blast furnace area comprises cooling walls, furnace bottoms, coiled pipes, tuyere hot blast valves and tuyere small sleeves of two blast furnaces. The cooling walls, the furnace bottoms, the coiled pipes, the tuyere hot blast valves and the tuyere small sleeves of the two blast furnaces need to be cooled through circulating water and are connected with heat exchangers and pipelines of the cooling walls, the furnace bottoms, the coiled pipes, the tuyere hot blast valves and the tuyere small sleeves of the two blast furnaces respectively, and the heat exchangers are connected with the water collecting box through water pumps. According to the device and method used for cooling the blast furnace circulating water through the sintering low-temperature exhaust heat, the low-temperature waste gas exhaust heat discharged by sintering is used fully, cooling of blast furnace equipment is achieved, and the energy saving effect is good; in addition, operation and maintenance are easy, intensified smelting of the blast furnaces is facilitated, and the yield is improved.

Description

technical field [0001] The invention relates to the field of low-temperature waste heat recovery, in particular to a device for cooling blast furnace circulating water by using low-temperature waste heat of sintering in the metallurgical industry. Background technique [0002] In the process of iron and steel production, the energy consumption of the sintering process accounts for almost 10% of the energy consumption of the entire enterprise, which is the second largest energy-consuming process after ironmaking. In the sintering process, about 50% of the heat energy is taken away by the sintering main exhaust gas and the exhaust gas of the ring cooler, and the waste heat of the sintering machine main exhaust flue gas accounts for about 13% to 23% of the energy consumption of the sintering process, but for a large sintering machine The low-temperature 100-150°C waste heat utilization of the flue has been neglected by many companies, but the large flue has abundant waste heat ...

AI Technical Summary

Problems solved by technology

At present, domestic heat exchange equipment mainly includes tubular heat exchangers, air coolers, plate heat exchangers, evaporative coolers, closed cooling towers, etc., tubular heat exchangers, air coolers, closed cooling towers, etc., almost There is too much water consumption, and the investment, energy consumption and operating costs of the entire system cannot reach the most economical characteristics

Even if more evaporative air coolers are used at present, the cooling process consumes energy, and the water temperature cannot be effectively guaranteed in different seasons, especially in summer, the cooling effect is not ideal, and a large amount of cooling water needs to be added to ensure the cooling cycle of the blast furnace water temperature

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