No-fluctuation hot blast stove converting method

A hot blast stove, no fluctuation technology, applied in furnaces, blast furnaces, heating furnaces, etc., can solve problems such as shortening the furnace replacement time, affecting the straight line of the blast furnace, and poor opening accuracy of the pressure equalizing valve

Inactive Publication Date: 2007-01-03
TIANJIN TIANTIE METALLURGICAL GRP
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  • Abstract
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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 fo...

Method used

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  • No-fluctuation hot blast stove converting method

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Embodiment Construction

[0010] The accompanying drawing is a flow chart of the process when the hot blast stove is replaced with pressure. The compressed air is drawn from the compressed air bag 1 of the blast furnace compressed air system. Pressure valve 4 is connected with cold air duct 6 after cold air valve 5 . Put the cold air pressure equalizing valve 7 in the normally closed state as a backup. Connect the compressed air equalizing valve to the microcomputer in the main control room, and when the hot blast furnace changes from the combustion state to the air supply state, close the gas regulating valve 8, close the air regulating valve 9, close the gas shut-off valve 10, and close the gas combustion valve 11. Cut off the blast furnace gas 12 entering the hot blast stove, close the air combustion valve 13, cut off the combustion air 14 entering the hot blast stove, close the flue valve 15 (the waste air valve 16 is closed at this time), and open the compressed air equalizing valve 4 (pressuriza...

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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...

Claims

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Application Information

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IPC IPC(8): C21B9/14
Inventor 刘瑞东庞顺清贺大鹏田桂秋
Owner TIANJIN TIANTIE METALLURGICAL GRP
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