Pressure-equalization energy recovery system for blast-furnace hot-blast stoves, and use method of system

Abstract

The invention discloses a pressure-equalization energy recovery system for blast-furnace hot-blast stoves. The pressure-equalization energy recovery system for the blast-furnace hot-blast stoves comprises a plurality of the hot-blast stoves, a waste pressure recovery tank, a cold air pipeline, a smoke pipeline, a pressure relief pipe and a chimney, wherein a cold air stop valve and a cold air pressure-equalization valve are arranged between each of inlets of the plurality of hot-blast stoves and the cold air pipeline in parallel, a smoke stop valve is arranged between each of outlets of the plurality of hot-blast stoves and the smoke pipeline, and a cold air pressure relief valve is arranged between each of the outlets of the plurality of hot-blast stoves and the pressure relief pipe; a pressure-charging adjustment valve and a pressure-charging valve are arranged between an inlet of the waste pressure recovery tank and the cold air pipeline, and a pressure-pre-equalization valve is arranged between an outlet of the waste pressure recovery tank and the pressure relief pipe; and the smoke pipeline and an outlet end of the pressure relief pipe communicate with the chimney separately,and a main pressure relief valve is further arranged at the outlet end of the pressure relief pipe. The invention further discloses a use method of the recovery system. According to the pressure-equalization energy recovery system for the blast-furnace hot-blast stoves, during application, waste pressure during pressure relief of the hot-blast stoves can be recovered, the fluctuation of a cold airpressure during pressure-charging of the hot-blast stoves can further be reduced, and no power consumption during daily maintenance is achieved; and moreover, a more obvious effect is achieved in thecase of higher capacity of the waste pressure recovery tank.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, energy saving and environmental protection, and more specifically relates to a hot blast stove system for ironmaking blast furnaces, in particular to a pressure equalization energy recovery system for blast furnace hot blast stoves and a method for using the same. Background technique [0002] At present, the blast furnace is generally equipped with three hot blast stoves, and generally adopts the working system of two firing and one delivery, that is, two hot blast stoves are in the firing state, and one hot blast stove is in the air supply state. Turn the hot blast stove that has been fired into the air supply state, and then turn the hot blast stove that has finished the air supply into the furnace state. The hot blast stove has been in this periodic alternate conversion state. When the hot blast stove is blowing air, the hot blast stove is in a high pressure state, and when ...

AI Technical Summary

Problems solved by technology

If the hot blast stove in the high-pressure air supply state is switched to the air supply state, the high-pressure gas in the hot blast stove needs to be unloaded, usually directly emptied through the chimney, resulting in a waste of energy

If the hot blast stove in the firing state is turned into the air supply state, the pressure in the hot blast stove needs to be raised first. Usually, cold air is used to pressurize the hot blast stove, resulting in large fluctuations in the pressure of the cold blast, which affects the production of the blast furnace.

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