Apparatus for controlling the pressure of hopper in the blast furnace

专利摘要:
PURPOSE: An apparatus for controlling top gas pressure in a blast furnace is provided which controls the top gas pressure so that a stable top gas pressure is maintained during charging of raw materials into the blast furnace by increasing a pressure of a hopper in the state that raw materials are supplied into the hopper. CONSTITUTION: In an apparatus for controlling top gas pressure in a blast furnace in which operation of the blast furnace is performed by supplying raw materials from a hopper and charging the raw materials supplied from the hopper into the blast furnace, the apparatus for controlling top gas pressure in the blast furnace comprises a connection means(40) which is connected to the hopper and the blast furnace so that a gas inside the furnace passes through the connection means(40); an open-and-shut means(41) which is installed at the connection means(40) so as to control flowing of the gas inside the furnace passing through the connection means(40); and a control means(23) controlling opening or closing of the open-and-shut means(41) depending on the supplying state of raw materials of the hopper, the charging state of the raw materials from the hopper into the blast furnace and the equalized pressure state between the hopper and the blast furnace.
公开号:KR20020033861A
申请号:KR1020000064025
申请日:2000-10-30
公开日:2002-05-08
发明作者:김창오；진민식；김영석
申请人:이구택；주식회사 포스코；
IPC主号:

专利说明:

CONTROL DEVICE OF THE BROADER DEVICE {APPARATUS FOR CONTROLLING THE PRESSURE OF HOPPER IN THE BLAST FURNACE}
[21] The present invention relates to a stationary pressure control device for controlling the stationary pressure to be charged without changing the pressure in the hopper hopper (2) when charging the raw material in the hopper (2) into the blast furnace (1), smooth and stable, In more detail, the raw material is supplied from the top hopper 2 and the pressure of the top hopper 2 is increased in the state of supply and supply completed to maintain the same pressure with the internal pressure of the blast furnace. The present invention relates to a stationary pressure control device for controlling a stationary pressure so as to maintain a stable stationary pressure when loading raw materials.
[22] Typically, in the blast furnace (1) is reduced by using carbon monoxide produced by the reaction of coke and oxygen to produce molten iron. The reducing gas generated in the lower part of the blast furnace 1 is in contact with the charged raw material while raising the furnace 1 to transfer heat and reduce the iron ore. In the lower part of the blast furnace, slag is produced by using a subsidiary material such as calcium carbonate to prevent the required molten iron from hardening. The gas which has risen is discharged out, and the molten iron collected in the lower part is taken out as a starting point.
[23] Conventionally, in order to supply raw materials from the hopper 2 by a conveyor belt during operation of the blast furnace 1 and to load the raw materials stored in the hopper 2 into the blast furnace 1, the hopper 2 and the blast furnace 1 The internal pressure is kept at equal pressure.
[24] At this time, the method of maintaining the same pressure by opening the first pressure equalizing valve 14 to introduce the semi-clean gas in the gas cleaning equipment into the top hopper (2) to increase the pressure in the top hopper (2). The elevated pressure is detected by the hopper pressure detector 7 and represented by the hopper pressure indicator 8. When the pressure rises above a predetermined value as described above, the top hopper differential pressure control system 6 generates a first equalization completion signal. After the completion of the first equalization, the second equalization blocking valve 5 is opened, and the secondary equalization is completed by performing secondary pressure with nitrogen gas.
[25] When the charging valve (MCG) attached to the lower part of the top hopper 2 is opened in the state of equalization completion, the raw material falls (loading) into the lower blast furnace by its own weight.
[26] In response to the signal of the hopper weight detector 9, when the loading completion state is detected by the charging state detection unit 10, the charging valve (MCG) attached to the bottom of the top hopper 2 is closed and the raw material is supplied again in the top hopper. The static pressure in the high pressure state should be equal to the atmospheric pressure. To this end, the back pressure valve 16 is opened to back up the pressure in the hopper.
[27] When the back pressure is completed, the raw material is supplied to the top hopper 2 again and the above operation is repeated.
[28] As the above process is repeated, the molten iron is produced and discharged by the hot air and the reducing action blown from the raw material and the hot stove in the blast furnace 1.
[29] However, in the conventional method as described above, since the raw material in the top hopper (2) enters the blast furnace at the beginning of charging, the top pressure increases, which is calculated by the second operator (12) to open the top pressure control valve (13). As the back pressure increases, the amount of raw material inside the hopper decreases as charging continues, and in this case, the furnace gas from the blast furnace (1) rapidly flows into the hopper, which causes the pressure of the government to fluctuate (reduce) rapidly. .
[30] The second operator 12 detects and calculates the output to decrease the output, thereby controlling the top pressure while closing the top pressure control valve 13, but controlling the pressure decrease because the speed of change of the pressure changes faster than the control speed. I could not.
[31] If the top pressure is greatly reduced, the load distribution control becomes unstable when the raw material is charged and the lower load impacts the blast furnace operation. In addition, if nitrogen is excessively introduced into the top hopper 2 during the secondary equalization and the differential pressure with the blast furnace 1 is higher than a certain value, the gas emergency discharge valve 15 is opened to execute the differential pressure control. Air pollution has caused environmental pollution.
[32] The present invention is to solve the problems as described above, the purpose of the connecting means for connecting the interior of the hopper (2) and the blast furnace (1) to each other so that the furnace gas can pass through each other after the completion of the second pressure equalization (40). ) And opening / closing means (41) in the connecting means (40) to open the gas pipe valve (41) at the completion of the second equalization pressure, and the high temperature furnace gas flows into the hopper (2). The pressure control device which minimizes the gas shrinkage at the start and maintains the pressure in the top hopper (2) and the blast furnace (1) during the actual loading after a certain time to stabilize the load distribution control to smooth the blast furnace work. In providing.
[1] 1 is a schematic diagram of a conventional feedstock raw material loading and static pressure control;
[2] 2 is a block diagram of a static pressure control apparatus according to the present invention;
[3] 3 is a schematic view of an embodiment of a top raw material loading and a top pressure control apparatus according to the present invention;
[4] 4 is a conventional chart of top raw material loading and top pressure control time;
[5] 5 is a time chart of the raw material loading and the static pressure control according to the present invention;
[6] Figure 6 (a) is a view related to the change in the stationary pressure according to the conventional raw material loading;
[7] Figure 6 (b) is the degree related to the top pressure change according to the loading of the top raw material according to the present invention;
[8] * Explanation of symbols for the main parts of the drawings *
[9] 1 ... Blast Furnace 2 ... Hopper Hopper
[10] 3 ... hopper differential pressure detector 4 ... hopper secondary equalization control valve
[11] 5 ... Hopper 2nd Equalizer Valve 2
[12] 6 ... first operator 7 ... hopper pressure detector
[13] 8 ... Hopper pressure indicator 9 ... Hopper weight detector
[14] 10 ... charging status detector 11 ... pressure sensor
[15] 12 ... second operator 13 ... static pressure control valve
[16] 14 ... Hopper 1st Equalizer Valve 1
[17] 15 ... Gas Emergency Relieuing Valve
[18] 16 ... Back pressure valve 20 ... Supply state detection unit
[19] 21 ... Equal pressure detector 23 ... Control means
[20] 40 ... connecting means 41 ... switching means
[33] In order to achieve the above object, the present invention provides a static pressure control apparatus for a blast furnace device that receives raw materials from the hopper 2 and charges the received raw materials into the blast furnace 1 to perform blast furnace work.
[34] A connection means 40 connected to the hopper 2 and the blast furnace 1 to allow the gas inside the furnace to pass therethrough;
[35] An opening / closing means (41) installed in the connecting means (40) to control the flow of the furnace gas passing into the connecting means (40);
[36] The raw material supply state of the top hopper (2) and the loading state of the raw material from the top hopper (2) into the blast furnace (1) and the pressure equalization state between the top hopper (2) and the blast furnace (1) Control means 23 for controlling the opening and closing of the opening and closing means 41.
[37] In addition, the control means 23
[38] Supply state detection unit 20 for detecting the supply state of the raw material in the top hopper (2),
[39] A charging state detection unit 10 for detecting a charging state of raw materials from the top hopper 2 into the blast furnace 1;
[40] And a pressure equalization state detection unit 20 for detecting a pressure equalization state between the top hopper 2 and the blast furnace 1, and after completion of supply and demand at the supply and demand state detection unit 20, the pressure equalization state detection unit 21 The opening and closing means 41 is opened at the time when the equalization completion is detected, and the charging state detection unit 10 is controlled to close the opening and closing means 41 at the time when the charging completion is detected.
[41] The connecting means 40 is not limited to the pipe, and may include any means for allowing gas to flow in. The supplied state detecting unit 20, the charged state detecting unit 10, and the equalizing state detecting unit 21 are respectively The supply and demand conditions of the raw material of the top hopper (2), the top pressure and the pressure equalization state inside the blast furnace (1) are detected, and further, supply and demand completion, charging completion and pressure equalization completion are respectively detected.
[42] Hereinafter, an apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
[43] FIG. 2 is a block diagram illustrating a top raw material loading and a top pressure control apparatus according to the present invention. The part of the blast furnace apparatus for the top pressure control apparatus according to the present invention is shown in FIG. Is displayed.
[44] 2 shows a hopper 2 receiving raw materials; Blast furnace (1) to charge the raw material from the hopper 2 to perform the blast furnace work; A hopper weight detector (9) for detecting the weight of the raw material of the top hopper (2); A differential pressure gauge (3) for detecting a pressure difference between the pressure hopper (2) and the blast furnace (1); One side is connected to the top hopper (2) and the other side is connected to the blast furnace (1) connecting means for allowing the furnace gas to pass through; An opening / closing means (41) installed in the connecting means to control the flow of the furnace gas passing into the connecting means (40); A supply-demand state detection unit 20 and a charged-state detection unit 10 for detecting a supply-demand state and a charged state, respectively, as signals from the weight detector 9; A pressure equalization state detection unit 21 for detecting a pressure equalization state by a signal of the differential pressure gauge 3; It includes the supply state detection unit 20, the charging state detection unit 10 and the equalization state detection unit 21 and the opening and closing of the opening and closing means 41 by the signal of each detection unit (20, 10, 21) Control means 23 for controlling are shown.
[45] In order to receive raw materials from the hopper 2, the pressure of the hopper 2 is equal to the pressure inside the blast furnace 1 in order to be charged into the blast furnace 1.
[46] When the supply-demand state is detected by the supply-demand state detector 20 by the weight value detected by the weight detector 9 and the equalization state is detected by the equalization state detector 21 by the signal from the differential pressure gauge 3, When the detected value detected by the set value is detected as a set value by operating the opening and closing means (41) newly established in the present invention passes the furnace gas inside the blast furnace (1) through the connecting means 40 into the hopper 2 (2). And control the flow of the furnace gas. The furnace gas is passed between the hopper 2 and the blast furnace 1 so that the pressure of the blast furnace and the blast furnace 1 maintains a uniform pressure even when charging, thereby smoothly charging without fluctuation of the blast pressure.
[47] Opening / closing of the opening and closing means 41 is performed by the control means 23. The control means 23 opens the supply-demand state detection unit 20, the charged state detection unit 10 and the equalization state detection unit 21. Include. When supply and demand completion is detected in the supply and demand state detection unit 20 and the completion of pressure equalization is detected in the pressure equalization state detector 21, the control means 23 is operated to open the opening and closing means 41 and the raw material starts to be charged. When charging is completed, when the charging completion is detected in the charging state detection unit 10, the opening and closing means 41 is closed by the operation of the control means 23.
[48] Hereinafter, the present invention will be described in more detail with reference to a schematic diagram of an embodiment according to the present invention of FIG. 3.
[49] Figure 3 shows a part of the blast furnace apparatus showing a schematic diagram of an embodiment of the loading of the raw material according to the present invention and the static pressure control device according to the present invention, the same reference numerals are shown in the parts corresponding to Figs. It is.
[50] A top hopper (2) receiving raw materials weighed for blast furnace work; Blast furnace (1) for receiving the raw material received from the hopper (2) to perform the blast furnace work; A weight detector 9 for detecting the amount of raw material supplied to the top hopper 2; Supply state detection unit 20 for detecting the supply and demand state of the raw material with a signal of the amount of the raw material detected by the weight detector (9); A charged state detector 20 detecting a charged state with a signal of the amount of raw material detected by the weight detector 9; A differential pressure gauge (3) for detecting a pressure difference between the top hopper (2) and the blast furnace; A pressure equalization state detection unit 21 for detecting a pressure equalization state by receiving a signal from the differential pressure gauge 3; Connection means 40 for connecting the interior of the top hopper (2) and the blast furnace (1) to allow the furnace gas to pass through; Opening and closing means (41) for controlling the flow of the furnace gas passing through the connecting means (40); In the stationary pressure control device of the blast furnace device comprising a control means 23 for controlling the opening and closing operation of the opening and closing means 41, the raw material is supplied from the top hopper (2) and the amount of the received raw material is a hopper weight detector It is detected by (9) and the supply and demand completion detection unit 20 is detected by the signal from the hopper weight detector (9) is completed raw material supply and supply in the top hopper (2). For stable and smooth loading of the raw material in the top hopper (2) into the blast furnace (1), the pressure should be equalized with each other. Open and discharge the semi-clean gas from the gas cleaning equipment 200 into the top hopper (2) to increase the pressure in the top hopper (2). The raised top pressure is detected by the hopper pressure detector 7 and represented by the hopper pressure indicator 8. As described above, the first pressure is increased by raising the top pressure to a predetermined value or more. When the top pressure rises above a certain value, the top hopper differential pressure regulator 6 generates a first equalization completion signal and completes the first equalization. At the time when the first equalization is completed, the hopper secondary equalization blocking valve 5 (shown in FIG. 1) is opened to carry out the second equalization with nitrogen gas.
[51] When the differential pressure between the inside of the top hopper 2 and the inside of the blast furnace 1 is detected by the differential pressure gauge 3 and the top hopper differential pressure (the top hopper pressure-the open pressure) reaches the set value (0 Kg / cm2), the differential pressure gauge 3 The equalization completion is detected by the equalization state detection unit 21 that detects the equalization state by the signal detected by the second equalization. However, even when the secondary equalization is completed, the hopper secondary equalization valve (5) is kept open so that charging is smoothly and stably while charging the hopper differential pressure is maintained at the set value while charging is completed. Close the hopper secondary equalization valve (5) when back pressure starts. When the equalization completion detected by the equalization state detection unit 21 is detected by a signal from the differential pressure gauge 3 in a state where supply and demand completion detected by the supply state detection unit 20 is detected, the control means according to the present invention ( 23 is operated to open and close the opening and closing means 41 to allow the furnace gases to pass through each other through the connecting means 40.
[52] At this time, when the opening / closing means 41 is opened, the high-temperature (150-200 ° C.) furnace gas is introduced into the inside of the low-temperature (atmosphere) furnace hopper 2 due to the temperature difference. State is achieved.
[53] After the supply and demand is completed as described above, the opening and closing means 41 is opened by the operation of the control means 23 in a state where sufficient equalization pressure is maintained, and the blast furnace 1 into the hopper 2 through the connecting means 40. Since the internal gas continues to be supplied, even when raw material charging starts, negative pressure does not occur as in the prior art and charging in a stable state is possible.
[54] When the raw material in the top hopper (2) starts to be charged into the blast furnace (1) by its own weight, and when the raw material loading is completed, the charged state detection unit (10) by the signal of the weight value detected by the raw material hopper weight detector (9) In the charging completion is detected and the opening and closing means 41 by the operation of the control means 23 is closed.
[55] After the charging is completed, the secondary equalizing valve (5), which was opened at the time of completion of the first equalizing pressure to maintain the equalization state, is closed, and the back pressure valve (16) is opened to lower the pressure of the elevated hopper (2) to atmospheric pressure. Apply back pressure so that the raw material can be supplied again.
[56] When the back pressure is completed, it is possible to supply the raw material to the top hopper 2 again as the first time and to perform the above-described process again.
[57] FIG. 5 is a time chart diagram of a raw material loading and a static pressure control according to the present invention, which is compared with FIG. 4 which shows a conventional time chart. FIG. 5 shows the raw material in the hopper 2 as shown in FIG. 5. When supply and demand starts and supply is completed, the first equalizing valve 14 (EV1) is opened to perform the first equalizing to a predetermined value or more, and after the first equalizing is completed, close the first equalizing valve 14 and Open the differential equalization valve (5; EV2) and perform secondary equalization so that the top hopper differential pressure (hopper pressure-blast furnace pressure) becomes the set value (0 Kg / cm2).
[58] When the opening and closing means 41 is opened by the operation of the control means 23 of the present invention by the completion signal of the secondary equalization and charging starts after a predetermined time, the hopper secondary equalization control valve unlike the conventional one shown in FIG. It can be seen that (4) remains almost pulled, and no increase in the hopper differential pressure occurs, so that the gas emergency discharge valve 15 (ERV) does not operate unlike the conventional method of FIG. That is, since the newly opened and closed means 41 is opened by the secondary equalization completion signal, the pressure of the top hopper 2 is always equal to the top pressure so that the differential pressure cannot be increased.
[59] When charging is completed, when the charging state detection unit 10 detects the completion of charging, the opening and closing means 41 is closed by the operation of the control means 23.
[60] When the raw material loading is completed, the elevated pressure of the top hopper 2 must be backed to supply the raw material back to the top hopper 2, so that the back pressure is opened by opening the back pressure valve 16; The same conditions as when supply and demand commence.
[61] Figure 6 shows a comparison of the static pressure change according to the loading of the raw material after installing the connecting means 40 and the opening and closing means 41 according to the prior art and the present invention. That is, Figure 6 (a) shows a change in the stationary pressure according to the conventional raw material loading, Figure 6 (b) shows a change in the static pressure according to the raw material loading according to the present invention. As shown in the prior art, the fluctuation range of the peak pressure at the time of raw material loading was -0.05 to +0.04 Kg / cm2, but it can be seen that the fluctuation range can be reduced to -0.02 to +0.01 Kg / cm2 according to the present invention.
[62] As described above, the present invention has a problem in that the loading pressure is greatly changed when the raw material is loaded into the blast furnace 1 from the hopper 2 so that the distribution of the internal blast furnace contents becomes unstable and eventually affects the blast furnace operation. In the present invention, it is designed to maintain a stable state without fluctuation of the top pressure even when the raw material is loaded, so that the stable top pressure control is possible and the differential pressure of the top hopper can be prevented, thereby preventing air pollution and blast furnace operation stability. There is an effect that can improve the molten iron production.

权利要求:
Claims (3)
[1" claim-type="Currently amended] In the furnace pressure control apparatus of the blast furnace apparatus which receives raw material from the top hopper (2), charges the received raw material into the blast furnace (1), and performs blast furnace work.
A connection means 40 connected to the hopper 2 and the blast furnace 1 to allow the gas inside the furnace to pass therethrough;
An opening / closing means (41) installed in the connecting means (40) to control the flow of the furnace gas passing into the connecting means (40);
The raw material supply state of the top hopper (2) and the loading state of the raw material from the top hopper (2) into the blast furnace (1) and the pressure equalization state between the top hopper (2) and the blast furnace (1) Control means 23 for controlling the opening and closing of the opening and closing means 41
Furnace pressure control device of the blast furnace apparatus comprising a
[2" claim-type="Currently amended] The method according to claim 1, wherein the control means (23)
Supply state detection unit 20 for detecting the supply state of the raw material in the top hopper (2),
A charging state detection unit 10 for detecting a charging state of raw materials from the top hopper 2 into the blast furnace 1;
Equalization state detection unit 20 for detecting the equalization state between the top hopper (2) and the blast furnace (1)
Furnace pressure control device of the blast furnace device characterized in that it comprises a
[3" claim-type="Currently amended] The method of claim 1,
The control means 23 opens the opening and closing means 41 at the time when the completion of the equalization pressure is detected by the equalization state detection unit 21 after the completion of supply and demand is detected by the supply state detection unit 20, and the charging state detection unit ( The control device of the blast furnace apparatus, characterized in that to control to close the opening and closing means 41 when the charging completion is detected in 10).

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同族专利:

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公开号 | 公开日

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引用文献:

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公开号 | 申请日 | 公开日 | 申请人 | 专利标题

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法律状态:
2000-10-30|Application filed by 이구택, 주식회사 포스코

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2000-10-30|Priority to KR1020000064025A

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2002-05-08|Publication of KR20020033861A

优先权:

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申请号 | 申请日 | 专利标题

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KR1020000064025A|KR20020033861A|2000-10-30|2000-10-30|Apparatus for controlling the pressure of hopper in the blast furnace|