KR920004983B1 - Injecting process for the powder coal into the blast furnace - Google Patents

Abstract

A feeding method of pulverized coal to blast furnace consists of charging feed tanks (3a1,3a2,3a3; 3b1,3b2,3b3) with pulverized through putting valve (2) from storage vessels (1A,1B), pressurizing feed tanks by opening pressurizing valve (6), transferring fine coal to pick-up (10) by opening feeding valve (4), and introducing it to blast furnace (11) by a great quantity of transfer air (9). In the method, three feed tanks are used by turns and emptied feed tank is charged again with pulverized coal and pressurizing gas after venting its inner pressure. When a manufacturing facility of pulverized coal gets out of order, one (3a3) of feed tanks (3a1,3a2,3a3) is changed as transfer tank (3a3) by connecting feed valve (4) to storage vessel (1B) via transfer tube (8a). It has advantages of reducing manufacturing cost of pig iron by increasing output and cutting down fuel expense.

Description

How to blow pulverized coal in blast furnace

1 is a schematic diagram of a pulverized coal injection device for blowing pulverized coal into a blast furnace according to a conventional method;

2 is a schematic diagram of a pulverized coal injection device for blowing high pulverized coal according to the present invention;

* Explanation of symbols for main parts of the drawings

1, 1A, 1B: reservoir 2: inlet valve

3, 3a ₁ , 3a ₂ , 3a ₃ , 3b ₁ , 3b ₂ , 3b ₃ : Blowing tank 4: Blowing valve

5a: Transfer valve 6: Charge valve

8a, 8b: transfer piping 11: blast furnace

12: pressure relief valve

According to the present invention, when the pulverized coal injection facility for producing coal and crushed coal is blown into the blast furnace is installed alone for each blast furnace, and there are two or more blast furnaces or two or more facilities are installed in one area, The present invention relates to a method for injecting pulverized coal of a blast furnace which is transported to another facility that lacks sufficient amount and blows into the blast furnace.

Conventionally, as shown in FIG. 1, pulverized coal blowing facilities installed for each blast furnace can be broadly classified into manufacturing facilities and blowing facilities.

The pulverized coal produced in the manufacturing facility is stored in the storage tank 1 of the blowing facility, and a certain amount is injected into the blowing tank 3 through the inlet valve 2, and then the filling valve 6 is opened to open the blowing valve 4 after filling. Open it and send it to the pick-up 10 by pressure, pressurize it with a large amount of conveying air 9, and blow into the blast furnace 11, and blow the next one immediately after one of the three blowing tanks is completed. The tank starts blowing and the blowing tank is discharged the internal pressure through the pressure discharge valve 12, and after receiving a certain amount again, the charging tank in the charged state.

However, since the pulverized coal production facility and the pulverized coal injection facility are installed in one conventional blast furnace, when one pulverized coal production facility is stopped due to a failure, the pulverized coal injection is not possible in the blast furnace or the amount of blown coal is reduced in other manufacturing facilities. Even if the production volume remained large, there was no transfer method and apparatus between the blowing facilities, and thus the transfer blowing was impossible.

Therefore, in order to solve the above problems, the present invention sets one of three pulverized coal injection tanks located under the pulverized coal storage tank of each facility for two blast furnaces as a transfer tank and transfers the transfer tank to the pulverized coal storage of other facilities. The purpose of the present invention is to provide a method for blowing pulverized coal into a blast furnace, which is connected to a pipe, injects the extra pulverized coal into the blowing tank, and then transfers the pressure to other equipment to blow into the blast furnace.

Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIG. 2, the pulverized coal produced in the manufacturing facility is stored in the storage tank 1A of the blowing facility, and a predetermined amount is introduced into the blowing tank 3 through the inlet valve 2, followed by a filling valve 6. Open the blow valve (4), open it and send it to the pick-up (10) by pressure, pressurize it as a large amount of conveying air (9), blow the combustion into the blast furnace (11), and blow in one of the three blow tanks. As soon as the tank is completely blown in, the next blow tank starts blowing, and the blow-in tank is discharged from the internal pressure through the pressure discharge valve 12, and after receiving a certain amount again, the blow-in waits in the charged state.

This proceeds automatically by a continuous blowing program. _Three injection tanks (3a ₁ , 3a ₂ , 3a ₃ ) are installed but only two can be pulverized coal continuously. One of the three can be controlled by a program as a spare. Select the tank-specific selection switch (in / out) to out.

The present invention is characterized by a method of transferring the pulverized coal to the pulverized coal blowing facility (hereinafter referred to as "relative facility") of the ride, and one of the three blowing tanks (3a ₁ , 3a ₂ , 3a) transfer tank Select (3a ₃ ) to connect the transfer pipe (8a) from the front end of the intake valve (4) to the counterpart storage tank (1B), and then install the transfer valve (5a). A nitrogen inlet valve (7a) is installed to prevent pulverized coal deposit and seizure in the pipe and to clean the pipe.

It must be installed equally in the counterpart equipment.

In FIG. ₂ , 3b ₁ , 3b ₂ , 3b ₃ is a blow tank, 8b is a transfer pipe, and 5b and 7b represent a transfer valve and a nitrogen inlet valve, respectively.

The method of conveying pulverized coal to the counterpart equipment is that when one of the three injection tanks is normally operated, when one injection tank 3a ₁ is being blown, the other injection tank 3a ₂ receives the pulverized coal and is in a blow-waiting state. Another blowing tank (3a ₃ ) is discharged to the internal pressure in the blow-up state, and is again charged with the pulverized coal and charged with the nitrogen filling valve (6) and is in the stand-by waiting state again. At this time, if the selection switch of the blowing tank (3a ₃ ), which is in the standby state, is selected as out, the pulverized coal can be continuously blown with only two blowing tanks (3a ₁ , 3a ₂ ) and the pulverized coal transfer of the blown out tank (3a ₃ ) is carried out. When the valve 5a is opened, the pulverized coal in the transfer tank 3a ₃ starts to be transferred to the relative pulverized coal storage tank 1B through the pulverized coal transfer pipe 8a.

At this time, the increase and decrease of the pulverized coal feed speed is possible by adjusting the pressure discharge valve 12 of the filling valve 6 to change the pressure, and the nitrogen inlet valve 7a must be open so that a small amount of nitrogen can be introduced at all times.

The pulverized coal transferred to the relative pulverized coal storage tank 1B is blown into the blast furnace through the same process as the pulverized coal stored in the pulverized coal storage tank 1A.

In the above description, only the transfer tank uses the existing blowing facility consisting of three blowing tanks, but in addition to the existing blowing tank, a new transfer tank is installed and connected to the relative pulverized coal storage tank by a transfer pipe to connect the pulverized coal to the pulverized coal storage tank. It can also be transferred to and blown into the blast furnace.

As described above, the present invention operates the pulverized coal production capacity of the other equipment to the maximum even when equipment abnormalities such as repair work due to the failure of one equipment are supplied to the equipment that lacks the spare, so that both facilities can continuously inject pulverized coal. The more coarse coal is charged, the lower the cost of coke can be reduced, which contributes to the cost reduction of molten iron production in the blast furnace. Although it is possible to maintain the best balance and increase the production of molten iron, in the case of a sudden drop in pulverized coal injection or interruption, the use of coke in fuel is increased due to the deterioration of blast furnace blast furnace, and the amount of molten iron is also reduced, which may cause various side effects. Solves these problems and reduces fuel costs in blast furnace chartering. It is very effective in the charter cost as increased acid amount.

Claims (2)

Pulverized coal produced in each pulverized manufacturing facility is stored in the storage tanks 1A and 1B of each blowing facility, and is injected into the blowing tanks 3a ₁ , 3a ₂ , 3a ₃ , 3b ₁ , 3b ₂ , 3b through the inlet valve 2 ₃ ) After inputting a certain amount to open the charging valve (6), after the charging, open the blow valve (4) to send to the pick-up (10) by the pressure and then pressurized as a large amount of conveying air (9) to the blast furnace (11) Blowing into the internal combustion, one of the three blowing tanks (3a ₁ , 3a ₂ , 3a ₃ , 3b ₁ , 3b ₂ , 3b ₃ ) immediately after the blowing tank has finished blowing, the next blowing tank starts blowing. In the injection tank, the pulverized coal injection method of the blast furnace is configured to discharge the internal pressure through the pressure discharge valve 12, and then receive a predetermined amount, and then wait for the injection in a charged state. If one of the intake tanks (3a ₁ , 3a ₂ , 3a ₃ ) is selected as the transfer tank (3a ₃ ), the intake valve (4) Transfer from the front end to the relative blowing equipment storage tank (1B) connected to a pipe (8a), and to transfer, the transfer piping (8a) a valve (5a) and a nitrogen input valve (7a), 3 of blow tank (3a _1, 3a ₂ , 3a ₃ ) In case of normal operation of all of them, when one blowing tank 3a ₁ is blowing, the other blowing tank 3a ₂ is pulverized and is blown in the compressed air and another blowing tank 3a ₃ After discharging the internal pressure in the blow-in completion state, it is again charged with the pulverized coal and pressurized as the nitrogen-charge valve (6), and then the blow-in standby state is again selected. At this time, the selection switch of the blow-in tank (3a ₃ ) in the blow-in state is selected as out. When two blow tank (3a _1, 3a ₂₎ continuously blow the pulverized coal and open the pulverized coal feed valve (5a) of the out blow tank (3a ₃₎ only the blown tank (3a ₃₎ within the pulverized coal is pulverized coal transport pipes (8a Is transferred to the relative pulverized coal storage tank (1B) through The pulverized coal injection method of the blast furnace, characterized in that the pulverized coal stored in the pulverized coal storage tank 1B is blown into the counter blast furnace 11, The method of claim 1, wherein a transfer tank is additionally installed in the blowing facility, and the transfer tank is connected to the relative storage tanks 1B and 1A by the transfer pipes 8a and 8b, respectively, to blow the pulverized coal into the counter-blast furnace 11. The pulverized coal injection method of the blast furnace characterized by the above-mentioned.

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