Method for cleaning and dust removal of large-scale blast furnace bustle pipe by devices

Abstract

The invention provides a method for cleaning and dust removal of a large-scale blast furnace bustle pipe by devices. According to the method, a cleaning device is distributed and arranged on a bustle pipe of a blast furnace body and is divided into an inner annular scavenging pipe and an outer annular scavenging pipe; staggered scavenging holes are parallelly dug at one side corresponding to the inner annular scavenging pipe and the outer annular scavenging pipe of the bustle pipe, wherein one ends of the scavenging pipes are sealed and plugged, and one ends are connected with a compressed air pipeline through a compressed air valve; and during the cleaning, a subsection valve is opened, the subsection cleaning is implemented, in the same section of 1 / 4 circular arc, the inner annular scavenging pipe is firstly opened for cleaning for 2 to 4 minutes, then, the outer annular scavenging pipe is opened for cleaning for 2 to 4 minutes, next, the inner annular scavenging pipe and the outer annular scavenging pipe are simultaneously used for cleaning for 2 minutes until the 1 / 4 circular arc is cleanly cleaned, then, the operation is repeated, and the next section of 1 / 4 circular arc of the bustle pipe is scavenged until the whole scavenging is cleanly scavenged.

Description

technical field [0001] The invention relates to the cleaning operation of blast furnace hot air surrounding pipes, especially for 2500m 3 The large-scale blast furnace has safe, simple, fast and practical promotion value. Background technique [0002] The blast furnace hot air pipe surrounds the blast furnace body, which is a very important air supply equipment for the blast furnace. When the former tapping and the two tapholes of the large blast furnace are overlapped, a large amount of dust is deposited on the hot air surrounding pipe. Especially after the blast furnace is injected with blue carbon, the coal injection pipe is frequently worn, and the leaked coal powder is also deposited on the hot air. On the surrounding pipe, the upper part of the hot blast surrounding pipe of the blast furnace is seriously accumulated with dust, which is difficult to eradicate. At present, the hot blast surrounding pipe of the blast furnace needs to be cleaned regularly once a week. Th...

AI Technical Summary

Problems solved by technology

[0002] The blast furnace hot air pipe surrounds the blast furnace body, which is a very important air supply equipment for the blast furnace. When the former tapping and the two tapholes of the large blast furnace are overlapped, a large amount of dust is deposited on the hot air surrounding pipe. Especially after the blast furnace is injected with blue carbon, the coal injection pipe is frequently worn, and the leaked coal powder is also deposited on the hot air. On the surrounding pipe, the upper part of the hot blast surrounding pipe of the blast furnace is seriously deposited with dust, which is difficult to eradicate

At present, the hot blast surrounding pipe of the blast furnace needs to be cleaned regularly once a week. The cleaning method is to open a cleaning hole at an interval of 2 meters on the annular platform above the hot blast surrounding pipe. First, connect a 2-meter-long ∮15mm steel pipe with a rubber pipe to see the waterworks. Then turn on the high-pressure 0.65Mpa compressed air, run the blast furnace from each cleaning hole for a week, and purge section by section; the problems of the purge method: 1) The temperature of the hot air inside the hot air surrounding pipe of the blast furnace is about 1000°C-1200°C, If the dust, coal powder and other attachments on the hot air surrounding pipe cannot be cleaned up in a timely and effective manner, the attachment will insulate the upper steel pipe outside the hot air surrounding pipe. Since the steel shell cannot effectively dissipate heat and cool, it will cause the outer upper steel pipe of the hot air surrounding pipe to Due to high temperature deformation and redness, in severe cases, the hot air surrounding pipe will blow open accidents, seriously affecting the normal production of the blast furnace

2) The gas concentration on the annular platform above the hot air surrounding pipe of the blast furnace body is high, generally around 800ppm (the highest is about 1600ppm), and there is a great potential safety hazard when hydraulic workers clean up here

3) At least 2-3 people are required to cooperate with each other to clean the blast furnace body hot air pipe. The operation time of the blast furnace in the old area is at least 1 hour, and the operation time of the blast furnace in the new area is at least 2 hours. This operation activity takes a long time; 4) Each operation time , all need to prepare at least 40 meters long rubber tubes to connect up and down, move back and forth, and need to be rectified and retracted after use, which is a waste of manpower and equipment

Images