Method and device for collecting steam of flushing cinder and afterheat of hot water in iron-making blast furnace

Abstract

The invention provides a method and a device for collecting the steam of flushing cinder and the afterheat of hot water in an iron-making blast furnace, which belong to the technical field of afterheat recovery. The method comprises the following steps of: delivering the filtered slag quenching water from a conventional blast furnace slag processing system to a circulating pre-heater to heat a working medium, allowing the slag quenching water at a lower temperature from circulating pre-heater to return to the blast furnace to flush slag; introducing the working medium heated by the pre-heater into a circulating evaporator in which the working medium absorbs the heat released in the condensation process of the flushing cinder steam and evaporates and allowing the vaporized steam to drive a steam turbine so as to drive a generator to generate power; and condensing the working medium departing from the steam turbine into liquid, returning the liquid to the circulating pre-heater and evaporator and recycling the liquid by repeated heating and vaporization. The device comprises a flushing cinder steam heat-exchange loop, a slag quenching water heat-exchange circulation loop and a working medium circulation loop. The method and the device have the advantages of maximizing the cyclic utilization of the flushing quenching heat and the water source, reducing the pollution of the flushing cinder steam to the environment and recycling the energy sources and the natural resources.

Description

technical field [0001] The invention belongs to the technical field of waste heat collection, and provides a method and a device for collecting waste heat of ironmaking blast furnace slag flushing steam and hot water. Background technique [0002] During the blast furnace ironmaking process in the iron and steel plant, the temperature of the molten slag produced is about 1500°C. The molten slag is rapidly granulated and quickly cooled into water slag by the high-speed water flow provided by the slag flushing water pump in the punching box, which is used as the main cement for the production of cement. Add raw materials. This process can produce a large amount of steam at 100°C and low-temperature hot water at 80-95°C. In the current water slag production process, the steam is generally released directly, which not only loses precious water resources, but also wastes a lot of heat, and pollutes the environment. In order to ensure the safe operation of the system, the slag f...

AI Technical Summary

Problems solved by technology

In the current slag production process, the steam is generally released directly, which not only loses precious water resources, but also wastes a lot of heat, and pollutes the environment

In order to ensure the safe operation of the system, the slag flushing water generally enters the cooling tower after filtering and sedimentation, and then circulates the slag flushing water again after cooling, which causes the heat of the slag flushing water to be lost in the cooling tower, and the heat lost in the cooling tower Steam also pollutes the environment

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