No-fluctuation hot blast stove converting method

Abstract

The no-fluctuation hot blast stove changing method belongs to the field of blast furnace iron smelting technology in metallurgic industry, and aims at providing stove changing method without fluctuation in cold air blast pressure. The method is that during changing hot blast stove from combustion state to air blast state, cold air is pressurized to the hot blast stove for feed the hot blast from the hot blast stove to the blast furnace before making the hot blast stove enter the air blast state. The cold air from the independent compressed air packet is purified and dewatered before being led into the hot blast stove through a equalizing valve. The method can avoid pressure fluctuation during stove changing, ensure continuous stable air blast, short stove changing time, raised blast temperature and realize the automatic control of stove changing pressurizing.

Description

Technical field: [0001] The invention relates to a method for changing a hot blast stove of an ironmaking blast furnace in the metallurgical industry. Background technique: [0002] The hot blast stove is an accessory device that provides high-temperature hot air for the blast furnace. In the operation of the hot blast stove, it is necessary to ensure the stability and continuity of the air supply to the blast furnace, and to prevent vicious production accidents. The hot stove production process is realized by switching the working state of each valve. The hot blast stove usually has three states: combustion, air supply, and stew. The process of switching from the combustion state to the air supply state is called furnace replacement. During furnace replacement, it must be ensured that at least one hot blast stove is in the state of supplying air, and the other hot blast stove can be transformed into combustion or other states. In the current hot blast furnace replacemen...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the disadvantages of poor opening accuracy of the manual control pressure equalizing valve, long furnace replacement time; the same cold air source is used for charging and air supply, which causes large fluctuations in the air supply pressure of the blast furnace and affects the smooth operation of the blast furnace, etc. Design a fluctuating furnace replacement method for hot blast stoves, that is, use an independent compressed air source instead of the blast furnace cold air as the gas source for pressure equalization during furnace recharging, avoiding the use of cold air for both air supply and pressurization The pressure fluctuation of the cold air caused by it improves the operation accuracy, shortens the furnace change time, and ensures the continuous and stable air supply of the hot blast furnace

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