KR100584995B1 - Apparatus for continuous insertion for fine coal by using mediation hopper and the same method - Google Patents

Abstract

The present invention is to supply the pulverized coal used as a fuel coke (COKE) replacement in the blast furnace process in a certain amount with the hot air inside the blast furnace to secure the heat balance in the furnace, pulverized coal using intermediary hopper to maximize the productivity improvement It relates to a continuous blowing device and a blowing method.

The present invention provides a storage hopper for storing pulverized coal, which has been separated by a plurality of bag filters; A lower portion of the storage hopper is connected via an import valve, and a charge valve and a vent valve are respectively connected to either side thereof, and on the other side thereof, a pressure detector and an ultrasonic level detector for detecting the pressure and level of the pulverized coal, respectively. Intermediate hopper is installed; A suction hopper connected to an import valve at a lower portion of the intermediary hopper, and having a charge valve and a vent valve connected to both sides thereof; And a blow valve connected to a lower portion of the blow hopper and configured to selectively open and close to blow pulverized coal into the blast furnace.

Blast furnace, pulverized coal, intermediary hopper, vibration generator, pressure detector

Description

Apparatus for continuous insertion for fine coal by using mediation hopper and the same method}

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram for demonstrating the grinding | pulverized coal injection process in the conventional blast furnace.

2 is a block diagram of a conventional pulverized coal injection device.

3 is a conventional pulverized coal injection flowchart.

Figure 4 is a block diagram of a pulverized coal continuous blowing device using an intermediary hopper according to an embodiment of the present invention.

Figure 5 is a front sectional view of the intermediary hopper shown in FIG.

6 is an operational flowchart of the present invention.

<Explanation of symbols for main parts of drawing>

1: blast furnace 5: pulverized coal storage hopper

21: import valve 23: vent valve

25: charging valve 27: intake valve

28: blown hopper 30: intermediary hopper

30-11,30-12: vibration generator 30-2: pressure detector

30-3: Ultrasonic Level Detector

The present invention relates to a continuous pulverized coal injection device using an intermediary hopper, and in particular, by supplying the pulverized coal used as a replacement for the coke (COKE) fuel in the blast furnace process with a constant amount of hot air in the blast furnace to ensure the heat balance in the furnace, The present invention relates to a pulverized coal continuous blowing device and a blowing method using an intermediary hopper to maximize productivity improvement.

As shown in FIG. 1, in general, in the pulverized coal blowing process, coke supplied from a coke manufacturing plant is dispersedly stored in two storage hoppers 1-1 and 1-2. The pulverized coal production process consists of two lines, and a feed feeder 2 is used to feed coke in a predetermined amount to the grinding mills (MILL) 3-1 and 3-2 in order to prepare fine powder (pulverized coal production by belt speed control). Dosage control).

The coke dropped into the grinding mills 3-1 and 3-2 is converted into fine fine powder through grinding process, and the prepared fine powder is transferred to the bag filters 4-1 to 4-4 by exhaust gas and is returned to the bag. After the separation operation of the exhaust gas and the fine powder is performed in the filter, the separated fine powder is stored in the storage hopper 5.

Three blowing hoppers 6, 7, and 8 are prepared as a step for blowing the fine powder into the blast furnace, and each blowing hopper 6 to 8 is circulated in a blow-pressure vane-import-charge-waiting process. Blown.

When the blow hoppers 6 to 8 are in the blown mode, the amount of fine powder cut out in the storage hopper 5 changes according to the pressure of the blow hopper, and the fine powder cut out from the blow hoppers 6 to 8 arrives at the top of the blast furnace. It is then distributed to be blown into each of the 34 blowholes, and then blown through the blast furnace.

Referring to Figure 2 in more detail, when the differential blowing amount for the blast furnace is determined the pressure of the blowing hopper (6, 7, 8) in accordance with the blowing amount and the storage hopper (5) when running the blow hopper charging mode by the set pressure ), Which acts on the charging valves (15, 16, 17).

Once the charge is complete, it will remain at stand-by for the next blow while maintaining the current pressure. When the standby hoppers 6 to 8 receive a blow command according to the entire sequence execution, the blow valves 18, 19, and 20 are opened, and the low residual amount of the blow hoppers 6 to 8 is set in advance. When the value is reached, the blowing mode is terminated and the next waiting blow hopper continues to blow (see Fig. 3).

In addition, the hopper is blown is completed, the pressure valve (VENT VALVE) (9, 10, 11) for venting the internal pressure (VENT) is operated, the upper differential storage hopper 5 when the hopper pressure drops to atmospheric pressure level FILLING VALVE (12, 13, 14) is opened to receive derivatives from.

When the differential transfer from the storage hopper 5 to the blowing hoppers 6 to 8 is completed for a predetermined amount or more, the import valves 12, 13 and 14 are closed again, and then the pressure is proportional to the current blast furnace blowing amount to prepare for the next blowing again. After charging, it is kept in the standby state.

At this time, the three blowing hoppers (6,7,8) is cycled through the process of receiving the fine powder, filling the pressure, blowing into the blast furnace, First, the mechanical properties of the pipe and valve constituting the three blowing hopper is different Therefore, although the same pressure condition is applied to each blowing hopper 6 to 8, the blowing amount deviation appears in the pulverized coal blowing process.

Second, at the time when the blow hoppers 6 to 8 are replaced, that is, the blow valve of the preceding hopper is closed and the blow valve of the trailing hopper is opened, continuous blow is made, and the blowing amount of the fine powder is momentarily in the process of operating the blow valve. As a result, there is a problem that uninjected or fluctuation is caused, which causes the pulverized coal injection to be momentarily stopped at A, B and C positions where each hopper is switched as shown in FIG. 3.

Third, the fine powder has the property of easy sticking, and the fine powder is fixed to the blown pipe of each hopper so that the cross-sectional area of the pipe is different for each blown hopper, even though the fine powder is blown at the same pressure. Each one is different from each other, resulting in a variation in the blowing amount. Therefore, there is a problem that the in-house frost relief occurs as the heat balance in the furnace is not constant due to the above-mentioned problems.

The present invention has been made in order to solve the above problems of the prior art, by continuously carrying out the pulverized coal to be injected into the blast furnace through the intermediary hopper, to solve the pressure deviation and blowing amount deviation to the best state of the furnace fluctuation and thermal balance The purpose of the present invention is to provide a pulverized coal continuous blowing device and a blowing method using an intermediary hopper that can be maintained, and to improve productivity through stabilization of yellowing.

The pulverized coal continuous blowing device using the intermediary hopper according to the present invention for realizing the above object comprises a storage hopper in which pulverized coal is separated by a plurality of bag filters; A lower portion of the storage hopper is connected via an import valve, and a charge valve and a vent valve are respectively connected to either side thereof, and on the other side thereof, a pressure detector and an ultrasonic level detector for detecting the pressure and level of the pulverized coal, respectively. Intermediate hopper is installed; A suction hopper connected to an import valve at a lower portion of the intermediary hopper, and having a charge valve and a vent valve connected to both sides thereof; And a blow valve connected to a lower portion of the blow hopper and configured to selectively open and close to blow pulverized coal into the blast furnace.

In addition, the method for continuously blowing pulverized coal using the intermediary hopper according to the present invention includes a method for blowing pulverized coal into the blast furnace as the apparatus, comprising: a back pressure command step of bringing the pressure of the storage hopper into an atmospheric pressure state; A pressure equalization command step of performing a pressure equalization of the intermediate hopper according to the differential amount of the intermediate hopper after the back pressure command step; And a pulverized coal discharge command step of operating the vibration generator and opening the vent valve of the intermediary hopper while transmitting the pulverized coal into the blast furnace through the blowing hopper after the pressure equalizing command step.

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

Figure 4 is a block diagram of a pulverized coal continuous blowing device using an intermediary hopper according to an embodiment of the present invention, Figure 5 is a front sectional view of the intermediate hopper shown in Figure 4, as shown in Figure 4, the pulverized coal storage Intermediate hopper 30 is installed in the lower portion of the hopper 5 via the import valve 21, and the pressure relief valve 22 and the vent valve 23 are connected to both left and right sides of the intermediate hopper 30, respectively.

In addition, one injection hopper 28 for directly injecting pulverized coal into the blast furnace 1 is installed in the lower portion of the intermediary hopper 30 via an import valve 24, and both left and right sides of the injection hopper 28 are provided. The charging valve 25 and the vent valve 26 are connected to each other, and a blow valve 27 is connected to the lower portion of the blow hopper 28.

As shown in FIG. 5, the intermediary hopper 30 is provided with pressure detectors 30-2 and ultrasonic level detectors 30-3 for detecting the pressure and level of pulverized coal, respectively, on both sides of the upper and left sides thereof. Vibration generators 30-11 and 30-12 are installed at the lower part of the pressure reducing valve 22 and the vent valve 23 to prevent the coal dust from sticking.

On the other hand, the pulverized coal continuous blowing method using the intermediary hopper according to the present invention is carried out through the apparatus according to the present invention configured as described above, it will be described as follows.

6 is an operation flowchart of the present invention, in order to import the pulverized coal into the intermediate hopper 30, the pressure and pressure back pressure to the pressure relief valve 22 and the vent valve 23 for controlling the pressure state of the intermediate hopper 30 Conduct. This process is for importing pulverized coal to the intermediary hopper 30 to replenish the pulverized coal to the blown hopper 28 when the amount of fine powder remaining of the blown hopper 28 is insufficient.

As a means for importing, a back pressure command for setting the pressure of the intermediary hopper 30 to atmospheric pressure is generated, and accordingly, the vent valve 23 is opened to discharge the pressure. When the pressure of the intermediary hopper 30 is detected by the pressure detector 30-2 and reaches atmospheric pressure, the pulverized coal is transferred to the intermediary hopper 30 by opening the import valve 21.

At this time, when the level detection through the ultrasonic level detector 30-3 is equal to or higher than a set value, the import valve 21 is closed and a pressure equalization command is generated to supply pulverized coal to the blowing hopper 28.

In addition, the driver sets the amount of pulverized coal to supply pulverized coal to the blast furnace 1, and when the set amount is determined, the pressure control valve 25 and the vent valve 26 which control the pressure state of the blown hopper 28 are equalized. When the back pressure is applied and the pressure equalization is completed, the pulverized coal is controlled by the intake valve 27.

In this process, since the pressure in the blast furnace 1 is a high pressure, backflow does not occur when nitrogen is supplied at a predetermined pressure or more. The vent valve 26 is closed and the pressure relief valve 25 is opened to supply pressure in comparison with the pressure of the blowing hopper 28, and when the pressure exceeds the set pressure, the import valve 24 is supplied to supply the pulverized coal to the blowing hopper 28. Will open to replenish pulverized coal. In this case, the process of blowing the pulverized coal into the blast furnace 1 through the blowing hopper 28 proceeds continuously so that blowing is continuously performed.

When the transmission is completed, the import valve 24 is closed, the vent valve 23 is opened to the back pressure, and the pulverized coal stuck in the mediation hopper 30 by the vibration generator (30-11, 30-12) You can prevent it.

According to the pulverized coal continuous blowing device and blowing method using the intermediate hopper of the present invention as described above, by blowing the pulverized coal into the blast furnace through the intermediary hopper and one blowing hopper connected to the pulverized coal storage hopper, It is effective to reduce the pulverized coal and prevent the pulverized coal from being uninjected or changed in an instant.

In addition, there is an effect of preventing the sticking of the pulverized coal installed in the intermediary hopper, and improve productivity through stabilization of yellowing.

Claims (5)

A storage hopper in which pulverized coal is separated through a plurality of bag filters; A lower portion of the storage hopper is connected via an import valve, and a charge valve and a vent valve are respectively connected to either side thereof, and on the other side thereof, a pressure detector and an ultrasonic level detector for detecting the pressure and level of the pulverized coal, respectively. Intermediate hopper is installed; A suction hopper connected to an import valve at a lower portion of the intermediary hopper, and having a charge valve and a vent valve connected to both sides thereof; And A blow valve connected to a bottom of the blow hopper and configured to selectively open and close to blow pulverized coal into the blast furnace; Pulverized coal continuous blowing device using an intermediary hopper, characterized in that configured to include. The method of claim 1, The intermediate hopper pulverized coal continuous blowing device using the intermediate hopper, characterized in that each installed a vibration generator for preventing the pulverized coal. In the method of blowing pulverized coal into the blast furnace with the apparatus of claim 1, A back pressure command step of bringing the pressure of the storage hopper into an atmospheric pressure state; A pressure equalization command step of performing a pressure equalization of the intermediate hopper according to the differential amount of the intermediate hopper after the back pressure command step; And A pulverized coal discharge command step of operating the vibration generator and opening the vent valve of the intermediary hopper while transmitting the pulverized coal into the blast furnace through the blowing hopper after the equalization command step; Pulverized coal continuous blowing method using an intermediary hopper, characterized in that consisting of. The method of claim 3, wherein The back pressure command step includes a first step of comparing the remaining amount of pulverized coal in the blown hopper with a set residual amount, a second step of comparing the pressure of the intermediary hopper with atmospheric pressure after the first step, and the pulverized coal into the intermediate hopper after the second step. And a fourth step of transporting, and a fourth step of measuring the amount of pulverized coal in the intermediate hopper after the third step. The method of claim 3, wherein The pressure equalizing step may include a first step of closing the differential feed valve of the intermediary hopper, a second step of closing the pressure vent valve of the intermediary hopper after the first step, and a set pressure of the injection hopper after the second step A third step of checking and storing the first step; a fourth step of equalizing the intermediate hopper after the third step; and a fifth step of opening the charge valve of the intermediate hopper after the fourth step; And a sixth step of comparing the pressure of the intermediary hopper and the pressure of the intake hopper after five steps.

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