Method and special device for collecting surplus heat of flushing cinder hot water of iron-smelting furnace

Abstract

The invention relates to a method for collecting surplus heat of flushing cinder hot water of an iron-smelting furnace. Heat of flushing cinder hot water can be collected through the method, the recycling of resources is realized so that the energy is saved and the pollution to environment is lightened, therefore, the invention also provides a special device of the method for collecting the surplus heat of the hot water. The method is characterized in that the flushing cinder hot water is sent to a circulating evaporator after being filtered to be used for heating working medium, the working medium is gasified, gasified steam drives a power machine to drive a generator; the working medium leaving the power machine is condensed to be liquid, the liquid flows back to the circulating evaporator to be gasified for being recycled; the temperature of the flushing cinder hot water leaving the circulating evaporator is reduced, the flushing cinder hot water returns to the iron-smelting furnace to be continuously used for flushing cinder, the working medium is changed into steam after absorbing heat in a heat exchanger, and the steam enters the power machine for applying work. The special device is characterized by comprising a flushing cinder hot water circulating loop and a medium circulating loop, wherein the flushing cinder hot water circulating loop comprises a filtering device, a circulating hot water pump, an evaporating heat exchanger, a water cooling pond and a cinder flushing device; the circulating loop comprises a medium circulating pipe of the evaporating heat exchanger, a power machine, a condenser and an organic working medium pump.

Description

(1) Technical field [0001] The invention relates to the technical field of waste heat collection and recovery equipment, in particular to a hot water heat exchange device for flushing slag in an ironmaking blast furnace. (2) Background technology [0002] In the blast furnace ironmaking process of the iron and steel plant, the temperature of the slag produced is about 1000°C. The slag is quenched into slag and granulated by the high-speed water flow provided by the slag flushing water pump in the slag flushing box for the production of cement. This process can produce a large amount of low-temperature hot water at a temperature of 80-95°C. Studies have shown that the lower the temperature of the slag washing water, the higher the activity of the cement made from the slag. Therefore, in the current production process, the slag washing water is introduced into the air cooling tower after sedimentation and filtration, and then circulated to wash the slag again after cooling. ...

AI Technical Summary

Problems solved by technology

In this way, a large part of heat is lost in the air cooling tower, which not only causes a waste of energy, but also causes thermal pollution to the environment.

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