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A blast furnace and furnace top technology, applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of gas combustion volume reduction, ignition gun difficult to ignite the gas in the furnace, explosion, etc., to reduce time-consuming and avoid furnace Vertex fire, the effect of improving safety performance
Active Publication Date: 2020-01-03
SGIS SONGSHAN CO LTD
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Problems solved by technology
If the depth of the material line in the furnace is greater than 2.5 meters after the wind shutdown, it is difficult for the flame of the ignition gun to directly contact the gas in the furnace, and it is difficult to ignite and time-consuming; if the temperature of the furnace top is too low after the wind shutdown, the gas concentration in the furnace is low, The fire of the musket is difficult to ignite the gas in the furnace; if the furnace top equipment failure or the feeding system fails to feed the material and the wind is shut down, the material line after the wind break is more than 4 meters, and the danger of furnace top fire at this time is relatively high. It is easy to cause a large amount of gas combustion on the top of the furnace to reduce the volume and inhale air, causing explosion accidents
[0005] Under the existing technical conditions, there is no set of safe, effective and mature technical solutions for furnace top ignition. When blast furnace operators perform furnace top ignition, there are great safety risks and they often fail to ignite and affect the shutdown time of the blast furnace.
Method used
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Embodiment 1
[0028] A blast furnace top ignition method, its operating steps are:
[0029] a) The blast furnace is in the later stage of the last slag and iron discharge before the wind shutdown. The calculation theory is that the slag and iron are clean, and the blast furnace taphole has a tendency to come in the wind. , steam with a pressure of 0.6MPa is fed into the top of the furnace, nitrogen with a pressure of 0.8MPa is fed into the gravity dust collector, the feeding system in the furnace is manually loaded, and the feeding time is determined according to the temperature of the furnace top. ℃ range, the depth of the material line is within 2.5 meters, the air reduction range is based on the iron mouth not blowing. When the wind comes in, open the furnace top, let the gravity dust collector disperse, and shut down the blast furnace;
[0030] b) After the blast furnace is shut down, the bag glasses valve will be closed, the blast furnace will be shut down for 15 minutes, the backflow...
Embodiment 2
[0034] When the blast furnace is shut down under abnormal conditions, the depth of the material line cannot be controlled, and the temperature of the furnace top is usually higher than 200°C. At this time, the ignition operation on the furnace top is prohibited. After the shutdown, the operation steps for the depth of the material line are greater than 4 meters:
[0035] e) After the wind is turned off, the depth of the material line is greater than 4 meters, the maximum amount of steam or nitrogen is introduced into the top of the furnace, and the water leakage cooling wall in the main body area of the blast furnace is closed.
[0036] f) Organize personnel to remove the tuyere blowpipe, seal all the tuyere with water gun mud and add a sealing plate to the tuyere;
[0037] g) Block the tuyere for 60 minutes, the reaction in the furnace is relieved, the top gas is gradually stabilized, put ore or slag into the furnace, and the amount is controlled by the depth of the material...
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Abstract
The invention relates to a blast furnace top ignition method. The method comprises the operation steps that (a) theoretical slag iron complete discharging time is calculated at the later stage of thelast slag iron discharging before damping down of a blast furnace; (b) a cloth bag glasses valve is closed after the damping down of the blast furnace, a backflow valve is opened after the damping down of the blast furnace, part of gas flow in the furnace is led out along a backflow pipe, and a furnace top ignition manhole is opened after backflow of the part of gas flow; (c) a coal gas kindling material is ignited and then put in an ignition port of an ignition gun, the ignition gun is turned on, and then the coal gas is ignited; and (d) furnace top steam and nitrogen are closed, the ignitiongun is turned on and extended into the furnace, the top of flame of the ignition gun is in contact with the material surface, the coal gas in the furnace automatically combusts when meeting the kindling material of the ignition gun, and the furnace top ignition operation is completed. By normalizing the furnace top ignition operation steps, the safety performance of the furnace top ignition operation of blast furnace operators can be improved, the time consumed by the furnace top ignition operation is shortened, and the danger caused by furnace top ignition in the abnormal damping down stateof the blast furnace is avoided.
Description
technical field [0001] The invention belongs to the technical field of blast furnace ironmaking, and relates to a blast furnace top ignition method. Background technique [0002] The blast furnace shutdown is a very important link in the blast furnace production. Generally, the shutdown time is more than 4 hours. According to the process requirements, the manhole at the top of the furnace is opened for ignition operation. The purpose is to burn the gas generated in the furnace in the shutdown state, so as to ensure the The maintenance work in the furnace top area is safe. [0003] At present, the top fire of the blast furnace shutdown furnace is basically to open the ignition manhole, ignite the ignition gun, start the ignition gun, allow the ignition gun to stretch into the top of the material surface in the furnace, and use the flame of the ignition gun as a kindling to ignite the gas in the furnace. [0004] There are many drawbacks and weak points in the existing method...
Claims
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Application Information
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