KR0116083Y1 - Device for blind protecter with blast furnace pulverizer coal lance - Google Patents

Abstract

The present invention relates to a blast-furnace fish-lance clogging prevention device of pulverized coal production line, more specifically, various foreign substances generated during pulverizer coal injection process that produces pulverized coal through crushing process in raw coal bin. And a cyclone with screens formed on the upper and lower sides of the fish lance to prevent the blockage of the blast-furnace fish lance so that impurities are filtered out before being injected into the pulverizer coal lance. In order to prevent clogging of the blast furnace fisheye fish lance caused by various foreign matters and contaminants generated during the process, the crushed coal fish is produced by centrifugal force at the transport line connected to the pickup point and the blast furnace fishfish fish lance. Install a cyclone to remove foreign matters from pulverized coal and separate foreign matters on the upper and lower sides inside the cycle. Install the upper and lower screen to remove, but the nitrogen purge valve for injecting nitrogen to the upper screen is installed in the discharge line of the cyclone, the vent valve is installed under the cyclone to remove the accumulated foreign matter on the lower screen, Manual valves are installed in the supply and discharge lines to block the inflow and outflow of pulverized coal during the internal repair of the cyclone.

Description

Blast Furnace Fish Lance Blocking Device for Pulverized Coal Production Line

1 is a schematic diagram of a blast furnace fisheye fishlance according to the prior art.

Figure 2 is a schematic view of the blast furnace fish-hole fish crust blocking device according to the present invention.

* Explanation of symbols for main parts of the drawings

6: Transport Line 8: Blast Furnace Fish Lance

9: pick-up point 10, 11: cyclone

12, 13: screen 14: nitrogen purge valve

15: discharge line 16: vent valve

17: Supply line 18, 19: Valve

The present invention relates to a blast-furnace fish-lance clogging prevention device of pulverized coal production line, more specifically, various foreign substances generated during pulverizer coal injection process that produces pulverized coal through crushing process in raw coal bin. And a cyclone with screens formed on the upper and lower sides of the fish lance to prevent the blockage of the blast-furnace fish lance from being caught before the dust is injected into the pulverizer coal lance. It would be.

In the blast furnace tuyere fish lance system according to the prior art, as shown in FIG. 1, the coal supplied from the coal briquette 1 through the transportation facility 2 through the crushing process 3 is collected. (cyclone, bag filter) (4) to collect the pulverized coal and stored in the main tank (5) filled with inert gas, which is sent to the transport line (6) continuously by the feeding system (pickling) The transport air 7 is supplied from the pick-up point 9 to transfer the pulverized coal to the distribution valve and finally burned by blasting from the blast furnace mouthpiece fishlance 8.

As described above, various foreign matters and contaminants generated during the production, storage, and blowing of pulverized coal from the yard yard workshop during the process are blocked in the blast furnace windfish lance, which causes the injecting of pulverized coal. Due to uneven distribution of circumferential furnaces, it can cause unsatisfaction. There was a risk of occurrence.

The present invention is to solve the problems of the prior art as described above, during the production and injection process of pulverized coal by the cyclone formed inside the upper and lower screens for removing foreign matters installed at the tip of the fish lance during the process of producing pulverized coal. Blocking the blast furnace blowfish fish lance prevents clogging of the blast furnace blowfish fish lance, improving productivity by increasing the pulverized coal injection rate and providing uniform blast distribution by blast furnace circumference. The purpose is.

A feature of the present invention for achieving the above object is that the pick-up point (9) and in that it is possible to prevent clogging of the blast furnace fisheye fish Lance by various foreign matters and contaminants generated during the process of producing pulverized coal Foreign matters are installed on the upper and lower sides of the cyclones 10 and 11 by installing cyclones 10 and 11 for removing the foreign matter from the pulverized coal by the centrifugal force in the transport line 6 connected to the blast furnace vent fish lance 8. The upper and lower screens 12 and 13 are installed to separate and remove the nitrogen purge, and a nitrogen purge valve 14 for injecting nitrogen into the upper screen 12 is installed in the discharge line 15 of the cyclone 10 and the lower screen. The vent valve 16 is installed below the cyclone 10 to remove foreign matter accumulated in the cyclone 10, and the inside of the cyclone 10 is supplied to the supply and discharge lines 17 and 15 of the cyclone 10. Manual valves (18) and (19) are provided to block the inflow and outflow of pulverized coal during repair. It will be installed.

Hereinafter, with reference to the accompanying drawings, the blast furnace inflatable fish crust prevention device according to the present invention will be described in detail.

Centrifugal force in the transport line 6 between the pick-up point 9 and the blast furnace fish lance 8 so as to prevent clogging of the blast furnace mouth fish lance by various foreign substances and contaminants generated during the process of producing pulverized coal. By installing the cyclone 10 (11) to remove the foreign matter contained in the pulverized coal, because the cyclone 10 (11) has the same configuration, the configuration and operation of one side cyclone 11 is as follows It is omitted from the description.

Upper and lower screens 12 and 13 of a mesh structure for removing foreign matters separated from pulverized coal by centrifugal force are installed on the upper and lower sides of the cyclone 10, and nitrogen (N ₂ ) is prevented to prevent clogging of the upper screen 12. The nitrogen purge valve 14 is installed in the discharge line 15 of the cyclone 10 to inject the gas, and the vent valve 16 is a cyclone to remove the foreign matter accumulated in the lower screen 13. 10) is installed downward, the manual valve 20 for the inspection and repair inside the cyclone 10 is installed on the lower peripheral side of the cyclone 10, the supply and discharge line 17 of the cyclone (10) Manual valves 18 and 19 are provided at 15 to block the inflow and outflow of pulverized coal during internal repair.

Referring to the operation of the blast furnace blowfish fish crust prevention device according to the present invention configured as described above, the pick-up point (9) by passing through the crushing process, the collecting process, the blowing facility from the crushed coal during the process of producing fine coal When the pulverized coal delivered to the gas passes through the operating cyclone 10 (called a normal mode), the cyclone vent valve 16, the transport inlet valve 21, and the nitrogen purge valve 14 are operated by the operator. ), The transport outlet valve 22, the cyclone inlet valve 18, and the cyclone nitrogen seal valve 24 are opened at the same time, so the pulverized coal passing through the pickup point 9 is inlet valve. As it passes through the cyclone 10 and is supplied to the cyclone 10, the heavy foreign matter contained in the pulverized coal falls under the lower screen 13 by the centrifugal force of the cyclone 10, and the light foreign matter is transferred to the upper screen 12.Ryeojyeo only pulverized coal (coke) of the removed foreign matters and impurities which would be injected into the blast furnace tuyeres fish lance (8) through the network out valve 22 is burned.

In addition, when problems such as internal repair and inspection occur in both cyclones 10 and 11 and use the existing line (called by-pass mode), the cyclone inlet valve 18 and nitrogen seals are operated by the driver. Since each of the valve 24, the vent valve 16, and the nitrogen purge valve 14 is closed and the outlet valve 22 and the inlet valve 21 are opened, the pulverized coal passing through the pickup point 9 is the inlet valve. (21) is passed through the outer valve 22 in order to be supplied to the blast furnace vent fish lance (8).

On the other hand, when nitrogen gas is injected into the cyclone 10 to prevent clogging of the upper and lower screens 12 and 13 of the cyclone 10 (called a vent mode), the cyclone is operated by a driver. Each of the inlet valve 18, the transport inlet valve 21, and the transport outlet valve 22 is closed and the nitrogen seal valve 24, the cyclone vent valve 16, and the nitrogen purge valve 14 are opened. Therefore, foreign matters clogged in the upper screen 12 or accumulated foreign matters in the lower screen 13 are sent to a separate main tank (not shown) through the cyclone vent valve 16, and after this, nitrogen purge after 60 seconds. The valve 14 can be closed and the cyclone holding manual valve 20 can be opened.

In the internal repair of the cyclone (called off mode), all of the valves that are automatically opened and closed by the operator's operation are closed and the manual valves are also completely repaired.

As described above, the blast-furnace fish lance blockage preventing device of the pulverized coal production line according to the present invention is a cyclone in which the upper and lower screens installed at the pickup point and the transport line connected to the blast-furnace fish lance are produced. By removing foreign matters and contaminants contained in the pulverized coal, only the pure coke is blown into the blast furnace balloon fish lance, which prevents the block lance from being blocked, thereby increasing the blowing rate of pulverized coal, thereby improving the cost and productivity. It is possible to prevent the risk of safety accidents by preventing the backflow of gas.

Claims (1)

The transport line connected to the pick-up point 9 and the blast furnace fish lance 8 can be prevented from clogging the blast furnace balloon fish lance by various foreign substances and contaminants generated during the process. 6) by installing a cyclone (10) (11) for removing foreign matters of pulverized coal by centrifugal force, and the upper and lower screens (12) (13) for separating and removing foreign matters in the upper and lower sides of the cyclone (10) (11). Although installed, the nitrogen purge valve 14 for injecting nitrogen to the upper screen 12 is installed in the discharge line 15 of the cyclone 10, the cyclone to remove the foreign matter accumulated on the lower screen (13) 10) A vent valve 16 is installed downward, and a manual valve for blocking the inflow and discharge of pulverized coal during internal repair of the cyclone 10 in the supply and discharge lines 17 and 15 of the cyclone 10. Blast furnace of pulverized coal production line, characterized in that each of the (18) (19) is installed Nine fish lance blockage protection.