JPH07332651A - Powder blow-in device - Google Patents

Abstract

PURPOSE:To prevent the blockade of a powder supply nozzle of a powder blow-in device. CONSTITUTION:In a blow-in device which is provided with an injection tank 1 which houses powder 2 and at least one powder supply nozzle 3 which blows the powder 2 stored in the infection tank 1 to a supply end 4 by way of a feed line 5, a shut off valve 13 is installed to the rear end of the powder supply nozzle 3 while a powder discharge line 16, which is connected to a collection tank 17 by way of a shutoff valve 18, is installed near a shutoff valve 7 located between the powder supply nozzle 3 and the feed line 5. An inactive feed pipe is connected to a spot near a shutoff valve 13 installed to the rear end of the powder supply nozzle 3 by way of a shutoff valve 15. This construction makes it possible to operate stabilized power blow-in operations and eliminate the need for the maintenance to close the powder supply nozzle 3 and cut down expenses accordingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for blowing powder particles into a supply end of a blast furnace or the like.

[0002]

2. Description of the Related Art A blowing device for blowing pulverized coal or ore powder (hereinafter referred to as powder or granular material) into a supply end of a blast furnace or the like generally has an injection tank for containing the granular material and a powder or granular material in the injection tank. It is provided with at least one powder and granular material supply nozzle for supplying to a supply end of a blast furnace or the like. The powder and granular material blowing device, the powder and granular material supply nozzle is connected to the feeding path connected to the tuyere of the blast furnace, the powder and granular material in the injection tank is through the powder and granular material supply nozzle and the feeding path. Is blown into the tuyere of the blast furnace.

When the powdery particles are blown into the blast furnace, as shown in FIG. 2, high pressure air 33 is supplied from a booster line 32 provided separately in the feeding path 31, whereby powdery particles in the injection tank 34 are supplied. Body 35 to blast furnace 3
Send to 6. On the other hand, when the feeding of the powder / granular material 35 is stopped, the powder / granular material supply nozzle 37 of the blowing device of the powder / granular material 35 is used.
The shut-off valve 38 provided at the connecting portion between the feed path 31 and the feed path 31 is first closed, and then, when all the powder and granules in the feed path 31 are blown into the blast furnace 36, the shut-off valve provided near the tuyere of the blast furnace 36. It is common to operate by the procedure of closing the valve 39. In addition,
Reference numeral 40 denotes an inert gas supply system for fluidizing the powder or granules 35 in the injection tank 34 and keeping the pressure in the injection tank 34 constant.

In the above-mentioned powdery-particulate blowing device, when the supply of the powdery-granular material 35 is stopped for a long period of time, the powdery-granular material condenses in the powdery-particles supply nozzle 37 to cause blockage, which makes re-feeding difficult. There were cases where Therefore, as a measure for preventing the blockage due to the condensation of the powder or granular material, the powder or granular material supply nozzle 37 has been kept warm.
It has not been possible to completely prevent the agglomeration of the powder and granules inside, and a great deal of manpower and cost are required to eliminate the agglomeration of the powder and granules.

As an agglomeration preventing device for the powder or granular material in the powder or granular material blowing device, a shut-off valve provided at a connecting portion between the powder or granular material supply nozzle and the supply path is temporarily closed when the powder or granular material is not supplied. After the injection tank is pressurized to a predetermined pressure, the shutoff valve is opened again, and the injection tank, the granular material supply nozzle, and the residual granular material processing for discharging the granular material remaining in the feeding path by discharging the residual granular material. Device provided with means (Japanese Utility Model Laid-Open No. 2-49925), injection tank for containing powder and granular material, and at least one powder and granular material supply nozzle for blowing powder and granular material in the injection tank to a supply end through a feeding path. In a blowing device provided with a device, a back-feeding line is provided at the tip of the powder or granular material supply nozzle to discharge the powder or granular material remaining in the nozzle into the injection tank. (JP-A-5-124727) have been proposed.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The device disclosed in Japanese Patent Publication No. 25 does not stop the feeding of the powder or granular material while leaving the powder or granular material in the injection tank, but leaves the powder or granular material in the injection tank, the powder or granular material supply nozzle, or the supply path. All the powder particles are discharged and pressure-fed by the residual powder particle processing means. Further, in the device disclosed in Japanese Patent Laid-Open No. 5-124727, even if the powder or granules stagnating in the powder or granular material supply nozzle are discharged into the injection tank, the powder or granular material enters the powder or granular material supply nozzle again. In some cases, re-blowing may be difficult.

The object of the present invention is to prevent the blockage of the powdery or granular material supply nozzle, which has been inevitable in the past, and to blow the powdery or granular material which can easily remove the blockage even if the powdery or granular material supply nozzle is blocked. To provide a device.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted various tests and examinations in order to achieve the above object. As a result, after the stagnant powder or granules are discharged into the powder or granule supply nozzle, the blockage valve is provided at the rear end of the powder or granule supply nozzle to prevent the powder or granules from entering the powder or granule supply nozzle again. It is possible to prevent the discharge of powder particles that are stagnant in the powder particle supply nozzle via a recovery tank and a cutoff valve that are separately provided near the cutoff valve between the powder particle supply nozzle and the feeding path. It has been confirmed that the present invention can be achieved by providing a powder / particle discharge line to be connected, and connecting an inert gas supply pipe through a shutoff valve in the vicinity of a blocking valve provided at the rear end of the powder / particle supply nozzle. Arrived

That is, the present invention provides an injection tank equipped with an injection tank for containing powder and granular material, and at least one powder and granular material supply nozzle for blowing the powder and granular material in the injection tank to a supply end through a feed path. A shutoff valve is provided at the rear end of the powder and granular material supply nozzle, and a powder and granular material discharge that is connected via a shutoff valve to a recovery tank that is separately provided near the shutoff valve between the powder and granular material supply nozzle and the feeding path. The powdery or granular material blowing device is characterized in that a line is provided and an inert gas supply pipe is connected to the vicinity of the shutoff valve provided at the rear end of the powdery or granular material supply nozzle through the shutoff valve.

[0010]

According to the present invention, the shutoff valve is provided at the rear end of the powder and granular material supply nozzle, and the recovery tank and the shutoff valve are separately provided near the shutoff valve between the powder and granular material supply nozzle and the feeding path. By connecting an inert gas supply pipe through a shutoff valve in the vicinity of the shutoff valve provided at the rear end of the granule supply nozzle, a powder discharge line connected to Close the shutoff valve between the supply path and the shutoff valve provided at the rear end of the particulate supply nozzle, and shut off from the recovery tank that is separately provided near the shutoff valve between the particulate supply nozzle and the feed path. By opening the shutoff valve of the particulate discharge line connected through the valve, and opening the shutoff valve of the inert gas supply pipe,
The granular material remaining in the granular material supply nozzle is discharged to the recovery tank through the granular material discharge line by the inert gas supplied from the inert gas supply pipe into the granular material supply nozzle. Then, close the shutoff valve of the particulate discharge line connected to the recovery tank provided in the vicinity of the shutoff valve between the particulate supply nozzle and the feeding path, and shut off the shutoff valve of the inert gas supply pipe. When closed, it is possible to prevent the granular material from entering the granular material supply nozzle. In the device for blowing powder or granules, when the blowing of powder or granules was stopped, the powder or granules remaining in the powder or granule supply nozzle were discharged to a separately provided recovery tank. It is also possible to discharge from the vicinity of the shutoff valve between the particle supply nozzle and the supply path to the upper part of the injection tank by using a pipe.

When the powder or granular material of the present invention is blown into the supply end by the blowing device, the shutoff valve provided at the rear end of the powder or granular material supply nozzle is opened to feed the powder or granular material to the powder or granular material supply nozzle. Close the shutoff valve of the particulate discharge line connected to the recovery tank installed near the shutoff valve between the passage and the inert gas supply pipe, and shut off the shutoff valve of the inert gas supply pipe from the booster line to the high pressure air or After supplying an inert gas such as high-pressure nitrogen gas to blow the supply route, open the shutoff valve between the powder supply nozzle and the supply route, the powder in the injection tank will It is blown to the supply end through the granular material supply nozzle and the supply path.

In order to stop the blowing of the granular material, first, the shutoff valve between the granular material supply nozzle and the feeding path is closed,
When the powder particles in the feeding path are exhausted, the high-pressure air supply valve from the booster line and the shutoff valve near the supply end of the feeding path are closed. At this stage, since the granular material remains in the granular material supply nozzle, the shut-off valve provided at the rear end of the granular material supply nozzle is closed and the granular material supply nozzle and the feeding path are separated. If the shutoff valve of the particulate discharge line connected to the recovery tank installed near the shutoff valve is opened and the shutoff valve of the inert gas supply pipe is opened, the particulates remaining in the particulate supply nozzle Is discharged to the recovery tank via the particulate discharge line by the inert gas supplied from the inert gas supply pipe, closes the shutoff valve of the powder discharge line connected to the recovery tank, and supplies the inert gas. Close the pipe shutoff valve.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to FIG. FIG. 1 is an explanatory view of the overall structure of the powdery or granular material blowing device of the present invention. In FIG. 1, 1 is an injection tank, 2 is an injection tank 1.
Granules such as pulverized coal stored inside, 3 is a granule supply nozzle for supplying the granules 2 to the blast furnace 4, and 5 is a feeding arranged between the granule supply nozzle 3 and the blast furnace 4. By route, feeding route 5
Is connected to the tuyere of the blast furnace 4 via the valve 6, and the other end is connected to the tip of the powdery or granular material supply nozzle 3 via the valve 7. Reference numeral 8 denotes a booster line separately provided in the feeding path 5, and this booster line 8 is provided with a valve 9 for supplying and stopping high-pressure air or high-pressure nitrogen gas. Reference numeral 10 denotes an inert gas supply line such as nitrogen gas for fluidizing the powdery particles 2 in the injection tank 1 and for keeping the pressure in the injection tank 1 constant. It is connected to 1. Reference numeral 13 is a valve provided at the rear end of the powder / particle supply nozzle 3, 14 is an inert gas supply pipe branched from the inert gas supply line 10 near the valve 13 and connected via a valve 15, 16 is powder particles It is a powder and granular material discharge line connected to the vicinity of the valve 7 at the tip of the body supply nozzle 3, and is connected to the recovery tank 17 via a valve 18.

When the powder or granular material 2 is blown into the blast furnace 4, the valve 13 provided at the rear end of the powder or granular material supply nozzle 3 is opened, and the valve 7 between the powder or granular material supply nozzle 3 and the feeding path 5 is opened. Powder discharge line 16 connected to a recovery tank 17 provided in the vicinity
The valve 18 is closed, and the valve 15 of the inert gas supply pipe 14 connected near the valve 13 is closed. Then, the valve 6 and the valve 9 are opened to supply the high pressure air or the high pressure nitrogen gas 9 from the booster line 8 into the feeding path 5 to blow the inside of the feeding path 5. When the valve 7 is opened after a certain period of time, the granular material 2 in the injection tank 1 is blown from the tuyere of the blast furnace 4 through the granular material supply nozzle 3 and the supply path 5. At this time, the valves 11 and 12 of the inert gas supply line 10 are opened so as to fluidize the powdery or granular material 2 in the injection tank 1 and keep the pressure in the injection tank 1 constant. Inert gas is supplied into the injection tank 1.

In order to stop the blowing of the powder or granules 2 into the blast furnace 4, the valve 7 is first closed, and when the powder or granules in the feed path 5 are no longer blown into the blast furnace 4, the booster line 8 is closed. The valve 9 and the valve 6 of the feeding path 5 are closed. At this stage, since the granular material 2 remains in the granular material supply nozzle 3, the valve 13 at the rear end of the granular material supply nozzle 3 is closed and the valve 18 and the valve 15 are closed as the next operation. When opened, the inert gas is blown into the rear end of the granular material supply nozzle 3 through the inert gas supply pipe 14, and the granular material 2 remaining in the granular material supply nozzle 3 is discharged from the granular material discharge line. 16
And is discharged to the recovery tank 17 via. The valve 15 and the valve 18 are closed at the time when the powder / granule 2 is exhausted from the powder / granule supply nozzle 3.

In the present invention, the powdery or granular material supply nozzle 3
A valve 13, a granular material discharge line 16 and an inert gas supply pipe 14 are provided in the collection tank 17 to collect all the granular material 2 remaining in the granular material supply nozzle 3 when the blowing of the granular material 2 is stopped. Since the particles are discharged to the nozzle, it is possible to prevent the powder or granular material supply nozzle 3 from being blocked due to the aggregation of the powder or granular material 2.
In addition, when starting the blowing of the powdery particles 2, the blowing of the powdery particles 2 can be started smoothly.

[0017]

As described above, according to the device of the present invention, the powder / granule supply nozzle of the injection tank is not clogged, and stable powder / granule injection is possible. As a result, it is possible to perform a stable operation of blowing the granular material into the blast furnace without reducing the number of the granular material blowing lines, and maintenance of the powder or granular material supply nozzle is not required, so that the cost can be reduced accordingly.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the overall configuration of a powdery or granular material blowing device according to the present invention.

FIG. 2 is an explanatory view of the overall configuration of a conventional powder / granule blowing device.

[Explanation of symbols]

 1, 34 Injection tank 2, 35 Powders 3, 37 Powders supply nozzle 4, 36 Blast furnace 5, 31 Feeding route 6, 7, 9, 11, 12, 13, 15, 18 Valve 8, 32 Booster line 10 Inert Gas Supply Line 14 Inert Gas Supply Pipe 16 Powder Discharge Line 17 Recovery Tank 33 Air 38, 39 Shutoff Valve 40 Inert Gas Supply System

Claims (1)

[Claims] 1. A blowing device comprising: an injection tank for containing powder and granular material; and at least one powder and granular material supply nozzle for blowing the powder and granular material in the injection tank to a supply end through a feeding path. A cutoff valve is provided at the rear end of the body supply nozzle, and a powder discharge line connected via a cutoff valve to a separately provided recovery tank is provided near the cutoff valve between the powder supply nozzle and the feeding path. A powdery or granular material blowing device, characterized in that an inert gas supply pipe is connected to the powdery or granular material supply nozzle in the vicinity of a shutoff valve provided at the rear end of the powdery or granular material supply nozzle.