Technology for long-distance direct injection of pulverized coal

Abstract

The invention discloses a technology for long-distance direct injection of pulverized coal. The technology comprises the following steps of a, fluidization mixing, wherein a part of conveyed gas is injected into an injection tank from the middle of the injection tank, a cone end of the injection tank needs enough fluidization equipment, a fluidization process is carried out at the bottom of the injection tank and the materials are discharged from an upper part of the injection tank, b, pulverized coal conveying, wherein a gas tangential-feeding-type mixer is adopted, a flow rate is controlled by pipe diameter grading adjustment comprising that when a pipe flow rate is more than 3m / s, the pipe diameter is increased so that the pipe flow rate is greater than or equal to a lowest flow rate of pulverized coal conveying, c, pulverized coal distribution, wherein an equal-head loss tubing design is adopted so that the total length of each pipe is equal and the number of elbows of each pipe is same, and a branch pipe conveying flow rate is controlled in a way that when a coal injection amount is greater than 1t / h, more spray guns are used and when the coal injection amount is reduced, the used spray guns are reduced, and d, pipe blocking prevention and elimination, wherein a flowing state in the current pipe is determined by a detector on the pulverized coal pipe, a pulverized coal flowing rate in the pipe is controlled to more than 3m / s, the pipe is automatically cleaned according to the determination result of the detector when the pulverized coal flowing rate is less than 3m / s, remote and manual blocking elimination devices needs to be arranged on the way of the pulverized coal pipe so that when the blocking situation is not serious, a remote blocking-elimination process is carried out on an operation screen and when the blocking situation is serious, a manual pipe sectionalized-cleaning process is carried out on site. The technology can be widely used as a method for long-distance direct pulverized coal injection of iron-making production.

Description

Technical field: [0001] The invention relates to a method for injecting pulverized coal, especially a method for directly injecting pulverized coal over a long distance. Background technique: [0002] Using pulverized coal as fuel and reducing agent to partially replace coke and inject it into the blast furnace can not only reduce production costs, but also make coal resources more effectively utilized. Therefore, it has been widely used in blast furnace ironmaking production. The traditional blast furnace injection The pulverized coal blowing process is as follows: the processed pulverized coal is transported to the injection station, and then the injection station uses compressed air as a carrier to transport it to the tuyere of the blast furnace through the delivery pipeline, and sprays the pulverized coal into the blast furnace from the tuyere with a spray gun . When the amount of pulverized coal injected exceeds a certain amount during production, the pulverized ...

AI Technical Summary

Problems solved by technology

The existence of too much unburned coal powder will affect the normal production of the blast furnace, often manifested as the accumulation of hearth in the furnace, the poor gas permeability of the material column, and the abnormal distribution of gas in the furnace, which will cause the blast furnace to go wrong