KR20000000036U - Solids Removal Device of Pulverized Coal Transfer Pipe - Google Patents

Abstract

The present invention relates to a solids removal device of pulverized coal conveying pipe which enables a smooth flow of pulverized coal by preventing the solids from sticking inside the conveying pipe by the solids removing device which puts iron pieces and sand into the conveying pipe. The first storage unit 1 and the first storage unit 1, in which an auxiliary hopper 6 is installed to easily transport sand 4 and shot balls 5 to the main hopper 12 to remove the sticking coal. The second storage unit (2) for maintaining the high pressure so that the sand (4) and the shot ball (5) introduced from the auxiliary hopper (6) of the main body to maintain a certain amount, and to be introduced into the transfer pipe 18, and the second The sand 4 and the shot ball 5 stored in the main hopper 12 of the storage unit 2 are easily supplied to the transfer pipe 18 by a connection pipe 21 having one end inserted into the transfer pipe 18. The summary is made up of a conveying pipe connecting portion (3).

Description

Solids Removal Device of Pulverized Coal Transfer Pipe

The present invention is a pulverized coal transfer facility for supplying pulverized coal which is used as auxiliary heat source to produce molten iron in the blast furnace inside the blast furnace, irregular solids in the transfer pipe when the coal type is changed or the humidity of rainy season is high. The present invention relates to a solids removal device of a pulverized coal conveying pipe which prevents the growth of the pulverized coal from flowing smoothly by a solids removal device for introducing iron pieces and sand into the conveying pipe.

[0003] In conventional pulverized coal manufacturing equipment, which is generally known, coal drying and a gas for transporting the coal are required, and a constant temperature (about 250 ° C.) is maintained in order to maintain the outlet temperature of the extraction duct and the bag filter chamber at a manageable temperature. A part of the waste gas for the blast furnace is boosted using a booster to preheat the inside of the mill and the bag filter to keep the work process smooth.

Then, the lump coal is conveyed to the grinding mill through the conveyor belt, and the appropriate amount is input, whereby the coal ground to a certain particle size is passed through the bag filter to be finely divided and sent to the pulverized coal storage tank, and the pulverized coal is supplied to the blast furnace. In order to use as an auxiliary heat source by supplying the pulverized coal injected into the conveying pipe at an air pressure of high pressure (14 kg / ㎠) by the air compressor to the blast furnace to be sprayed to the inside with a plurality of blow lances.

Conventional pulverized coal manufacturing equipment related to this technique is, as shown in Figure 1, the coal stored in the coal hopper 101 through the belt conveyor in the coal mill, falling through the coal feeder 102 into the mill 103 The mill 103, which is a manufacturing facility of pulverized coal, is operated, and the fine powder ground with the west gas in the mill 103 sends the pulverized coal to the bag filter 104 by the waste gas of the hot stove. The fine powder collected by the bag filter 104 is stored in the storage tank 105 through a valve, and the stored fine coal is transported by nitrogen (N2) gas that is loaded and charged in the feed tank 106 while the valve is opened. It is sent to the distribution tank 108 separated into 34 places through), connected to the 34 vent holes 111 inserted into the blast furnace 110 through the blow pipe 109 connected to the distribution tank 108. To be sprayed to the inside of the blast furnace 110 It is made of.

However, in the above pulverized coal manufacturing equipment, the pulverized coal is pulverized in the blast furnace 110 because the pulverized coal is fixed to the inner surface of the transfer pipe 107 when the pulverized coal contains moisture. The amount of blowing is uneven, which affects the management of yellowing (heat distribution and ventilation in the furnace), which makes it difficult to operate smoothly, thereby directly affecting production.

In addition, in order to prevent the seizure phenomenon when performing the operation of removing the fixing portion through one side of the conveying pipe 107, work in a state in which the operation is stopped or diminished (loading by reducing the amount of ore) and blasting (inside the blast furnace) By reducing the amount of hot air blown into the air), the production is reduced, the cost is increased, and the work load is increased by the high-pressure heat source injected into the conveying pipe 107, and a fatal safety accident occurs. There were many problems such as.

The present invention is to improve the various problems as described above, the purpose is to remove the pulverized coal stuck in the transfer pipe in the normal operation state without the work such as photosensitive or wind blowing, the amount of production due to shortening or stopping the operation It is to provide a solids removal device of the pulverized coal transport pipe to prevent the deterioration of the fire in advance, to prevent the safety accidents caused by the work in the high temperature state, and to improve the productivity by maintaining the sulfur in a stable state.

As a technical configuration for achieving the above object, the present invention, the first storage unit and the first and second discharge valve is installed in the discharge pipe connected to the lower side of the auxiliary hopper is installed to accommodate the sand and Shot Ball (Shot Ball) and The main hopper which is connected to the discharge pipe of the first storage unit is installed on the upper side, and the upper and lower limit bar is installed on the upper side of the main hopper is installed, the air connected to the booster to the side of the main hopper A supply pipe is coupled to the upper and lower sides, and a second storage part in which a vent valve is installed at a lower side of the main hopper and a discharge pipe in which a primary discharge valve is coupled to a bottom of the hopper of the second storage part are connected and expanded at a lower side thereof. The high pressure of the pulverized coal conveying pipe, which is connected to the pipe, is composed of a conveying pipe connecting part which inclinedly couples the connecting pipe to which the shock valve and the secondary discharge valve are coupled to the lower side of the expansion pipe. By provision of a mold removal device.

1 is a schematic diagram showing a pulverized coal production plant of a typical blast furnace

Figure 2 is a schematic diagram showing the installation state of the solids removal device in the pulverized coal production equipment according to the present invention

Figure 3 is a schematic diagram showing the solids removal device of the pulverized coal transfer pipe according to the present invention

Explanation of symbols on the main parts of the drawings

1 ... 1st storage 2 ... 2nd storage

3.Transfer piping connection 6 ... Secondary hopper

7.Exhaust piping 8 ... Controller

12 Main hopper 14 Height adjuster

16.Air supply piping 18 ... Transport piping

21 Connection pipe 22 Air control valve

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic view showing a solid matter removal apparatus installed state in the pulverized coal production equipment according to the present invention, Figure 3 is a schematic view showing a solid material removal device of the pulverized coal transport pipe according to the present invention, The fine powder is sent to the bag filter 34 by the waste gas of the hot stove, and the fine powder collected in the bag filter 34 is stored in the storage tank 35 through a valve, and the stored fine coal is opened in the feed tank ( Loaded to 36 and sent to the distribution tank 38 is separated into a plurality of places through the transfer pipe 18, a plurality of inside the blast furnace 40 through the blown pipe 39 connected to the distribution tank 38 In the pulverized coal manufacturing facility connected to the vent 41 to inject pulverized coal, the first storage unit (3) on the feed tank 36 side of the feed pipe (18) connecting the feed tank (36) and the distribution tank (38). 1) and the fixed carbon made up of the second storage portion (2) and the transfer pipe connection portion (3) It is achieved by the configuration in which the device is installed.

The first storage unit 1, which stores sand and shot balls that are introduced into the conveying pipe to which pulverized coal is transported and removes fixed coals, includes sand (particle size 3 to 5 mm) 4 and shot ball (4 to 6). A cone-shaped auxiliary hopper 6 is installed to accommodate a 5 mm particle size 5), and a discharge pipe 7 is connected to a lower side thereof, and a controller 8 is connected to the discharge pipe 7. ) Are first and second discharge valves 9 and 10 electrically connected to each other.

The second storage part 2 which is connected to the lower end of the discharge pipe 7 of the first storage part 1 and adjusts the storage amount of the sand 4 and the shot ball 5 has a discharge pipe 7 at the upper end. The main hopper 12 of the sealed type is connected to both sides and the support frame 11 is coupled to each other, and the upper and lower limit detection bars 13 and 13a of different lengths are coupled to the upper one side of the main hopper 12. The height adjusting port 14 is installed, and the air supply pipes 16 and 16a connected to the boosters 15 up and down sides of the main hopper 12 are respectively coupled to the lower side of the main hopper 12. The vent valve 17 is installed, and the air control valves 22 and 22a installed in the booster 15 and the air supply pipes 16 and 16a are electrically connected to the controller 8.

The conveying pipe connection part 3 for supplying the sand 4 and the shot ball 5 stored in the main hopper 12 to the conveying pipe 18 through which the pulverized coal is conveyed is primarily formed on the bottom surface of the main hopper 12. A discharge pipe 7a to which the discharge valve 9a is coupled is connected, and the expansion pipe 19 is connected to the lower side thereof, and the check valve 20 and the secondary discharge valve 10a are connected to the lower side of the expansion pipe 19. Is connected to the coupling pipe 21 is coupled to the end is inclined coupled to the inside of the transfer pipe 18, the first and second control valve (9a) 10a is configured to be electrically connected to the controller (8) Is done.

Reference numeral 23 is a pressure gauge for measuring the pressure in the main hopper 12.

Referring to the operation of the present invention made of such a configuration as follows.

As shown in Fig. 2 and 3, the ground fine powder is sent to the bag filter 34 by the waste gas of the hot stove, wherein the fine powder collected in the bag filter 34 is stored in the storage tank 35 through the valve The pulverized coal is stored in and sent to the lower feed tank 36, and the pulverized coal loaded in the feed tank 36 is sent to the distribution tank 38 separated into a plurality of places through the transfer pipe 18, the distribution tank The pulverized coal is injected by inserting it into the vent hole 41 inside the blast furnace 40 through the blown pipe 39 connected to the 38.

In addition, the connection pipe 21 inserted into the transfer pipe 18 is inserted and coupled inclined in the same direction as the flow direction of the pulverized coal, so that the sand 4 and the shot ball 5 stored in the main hopper 12 are transferred to the pipe 18. Sand (4) and shot ball (5) easily flows into the pulverized coal flowing at a high speed when it is introduced into the inside of the pulverized coal, and is transported together with the pulverized coal so that the solid matter (fixed coal) that is fixed inside the conveying pipe 18 is fixed. Cleaning by the impact and to prevent the occurrence of deposits inside the conveying pipe (18).

In addition, the expansion pipe (19) is installed along the discharge pipe (7a) connected to the lower portion of the main hopper 12 to absorb and easily separate the disturbance factors caused by the air mixing and vibration of the main hopper (12) The check valve 20 provided below the expansion pipe 19 prevents air from flowing back through the connection pipe 21 due to the pressure abnormality of the transfer pipe 18.

Further, sand (particle size 3 to 5 mm) 4 and shot ball (iron strip pieces of 4 to 6 mm particle size) 5 introduced to remove the solid matter (fixed coal) are 7 The auxiliary hopper 6 is inserted into the auxiliary hopper 6 of 3: 3, and the upper side of the auxiliary hopper 6 is opened so that the sand 4 and the shot ball 5 can be easily introduced, and the lower side thereof is a cone. It is formed in a shape to be easily discharged to the discharge pipe (7) connected to the bottom of the auxiliary hopper (6).

Subsequently, the controller 8 is installed to operate when the pulverized coal injection of the blast furnace 40 is at least 35 tons per hour and the set pressure of the air compressor is 14.0 kg / cm 2 or more. If the blowing amount is irregular, the controller 8 is turned on to close the secondary discharge valve 10 electrically connected to the controller 8 to stop the inflow of sand and shot balls from the auxiliary hopper 6, Subsequently, the air control valve 22 is closed to prevent inflow of high pressure air into the main hopper 12, and the vent valve 17 is opened to discharge sand and shot balls inside the main hopper 12 to detect the lower limit bar 13a. Stops the operation.

Subsequently, after closing the vent valve 17, the secondary discharge valve 10 and the primary discharge valve 9 are sequentially opened, and the inner side of the main hopper 12 until the upper limit detection bar 13 is operated. Sand and shot balls are injected from the auxiliary hopper 6, and when the feeding is completed, the air control valves 22 and 22a are opened to supply air of high pressure (14㎏ / ㎠) generated by the booster 15. The inside of the main hopper 12 is filled through the pipes 16 and 16a.

Subsequently, the sand 4 and the shot ball 5 filled in the main hopper 12 at a high pressure state are first and second discharge valves 9a electrically connected to the controller 8 at the discharge pipe 7a. 10a is sequentially opened to inject the sand 4 and the shot ball 5 at a high pressure into the conveying pipe 18 through a connecting pipe 21 which is inclinedly coupled to the inner side of the conveying pipe 18. The sand 4 and the shot ball 5 are flowed inside the conveying pipe 18 at a high pressure and a high speed to collide with the solids, thereby removing the solids by the impact force.

In addition, the sand (4) and the shot ball (5) flows along the conveying pipe (18) together with pulverized coal and solids, and is introduced into the blast furnace (40), and naturally incinerated at a high temperature inside the furnace, and the main When the sand 4 and the shot ball 5 in the hopper 12 are introduced into the feed pipe 18 and the lower limit detection bar 13a is operated, the secondary discharge valve 10a is closed, and then the primary discharge valve 9a. And then the vent valve 17 is opened after the secondary discharge valve 10 and the air control valves 22 and 22a are closed, so that the residual pressure in the main hopper 12 is lost so that the next work can be repeated. will be.

As described above, in the solids removal device of the pulverized coal conveying pipe according to the present invention, the pulverized coal stuck to the conveying pipe is removed in the normal operation without undergoing dimming or blasting, thereby reducing the production amount due to the shortening or stopping of the operation. It prevents the phenomenon in advance, prevents safety accidents by eliminating work in a high temperature state, and has excellent effects such as improving productivity by maintaining a constant yellowness in a stable state.

Claims (1)

In pulverized coal manufacturing equipment, The discharge pipe (7) is connected to the lower side of the auxiliary hopper (6) to open the upper side to accommodate the sand (4) and the shot ball (5), and is electrically connected to the controller (8) to the discharge pipe (7) A first storage part 1 in which first and second discharge valves 9 and 10 are sequentially installed; A height of the upper and lower limit detection bar 13 (13a) of different lengths is installed on the upper side of the main hopper 12 is installed in the sealed main hopper 12 is connected to the upper discharge pipe (7). The adjusting hole 14 is installed, the air supply pipes 16 and 16a connected to the booster 15 up and down one side of the main hopper 12 are respectively coupled to the lower side of the main hopper 12. An vent valve 17 is installed, and air control valves 22 and 22a respectively installed at one side of the booster 15 and the air supply pipes 16 and 16a are electrically connected to the controller 8. A second storage unit 2, A discharge pipe 7a to which the primary discharge valve 9a is coupled to the bottom of the main hopper 12 is connected, and a expansion pipe 19 is connected to a lower side thereof, and a shock valve is disposed below the expansion pipe 19. The connecting pipe 21 to which the 20 and the secondary discharge valve 10a are coupled is inclinedly coupled to the inside of the transfer pipe 18, and the first and second control valves 9a and 10a are connected to the controller 8. Solids removal device of the pulverized coal transfer pipe, characterized in that it comprises a transfer pipe connecting portion (3) electrically connected with