KR100418980B1 - N2 reparation method in burden hopper - Google Patents

Abstract

The present invention is to fill the ore in the hopper two hopper (Hoper) for charging the mineral in the furnace during operation of the blast furnace, and then to charge the inside of the hopper higher than the nominal pressure for the smooth charging into the furnace to be charged at an appropriate level. A method for nitrogen compensation of a top hopper, comprising: a method in which a volume compensation control is possible with nitrogen as much as ore flows into the furnace (1) during the secondary charging process among the top charging devices in the blast furnace (1) operation. A communication controller for instrumentation control is installed in the process computer so as to check the amount of ore and linked to the PLC; An operation step of calculating an overall base of the ore when the operator sets a different setting amount for each kind of ore when the operation index is changed; After the set ore is imported from the raw material to the top hopper (Hopper) (10-1, 10-2) through the transport belt to recognize the type of ore imported to the hopper (10-1, 10-2) Light type recognition step; Weighing measuring step of measuring the weight of the species based on the species (Coke, Ore, Small) imported to the top hopper (10-1, 10-2); A pressure detecting step of detecting the present pressure of the blast furnace and the main pressure of nitrogen supplied to the factory when the measured weighing value is transmitted; A calculation step of calculating a compensation amount of nitrogen by calculating a current ore discharge speed and a missing volume on the basis of the recognized mineral species when the charging start proceeds; In order to supply the calculated amount of nitrogen for the volume compensation during the charging, the opening degree of the nitrogen pressure fluctuations (16-1, 16-2) is controlled, and the flow rate is controlled by detecting and comparing the current nitrogen flow rate at the controlled opening degree. It is composed of nitrogen flow control step, and it is possible to charge the nitrogen with the proper amount without expensive consumption of the expensive nitrogen when charging the nitrogen for smooth flow of the ore when it is charged into the furnace. It can operate stably without any effect on actual operation and can have the absolute effect of energy saving.

Description

N2 reparation method in burden hopper}

The present invention relates to a nitrogen compensation method of the top hopper according to the charge characteristics, in particular in the hopper two hopper (Hoper) for charging the mineral in the furnace during operation of the blast furnace

The present invention relates to a nitrogen compensation method of a top hopper, which is charged at a proper level after filling the hopper with a higher pressure than the top pressure for smooth charging into the furnace after filling the ore.

1 is a perspective view of a flow rate control pressure for charging a conventional blast furnace ore, Figure 2 is a control time chart of the conventional compensation equalization, it will be described with reference to the following.

In the blast furnace (1), charging means blowing hot air at a high temperature (1200 ° C) through the tuyere (2) for the production of molten metal and supplying fuel to two hoppers (10-1, 10-2) installed on the blast furnace (1). Coke and raw material sintered ore are set at the proper ratio and imported to each hopper for each type, and then the USV (Upper Seal Valve) (14-1, 14-2) is closed and the primary pressure squeegee ( Open PEV: Premary Equalising Valve (16-1,16-2) to equalize pressure lower than nominal pressure (-0.05mg / ㎠) and make secondary equalization valve so that ore can flow smoothly into the furnace. Open the valve (13-1, 13-2) and apply the pressure higher than the nominal pressure (+ 0.05mg / ㎠), and open the LSV (Lower Seal Valve) (12-1, 12-2) when the specified level is reached. After the angle and the designated notch, the MCG (11-1, 11-2) is opened and the contents are sprayed into the furnace.

When the charging of the charged material is completed, close the MCG (Meterial Flowrate Gate) (11-1, 11-2) of the top hopper and lower seal valve (LSV) to bring the charged hopper to atmospheric pressure for import of the next ore. Close (12-1,12-2) and open RV (Relife Valve) (15-1,15-2) to dissipate to atmosphere and detect Hopper pressure and when it reaches atmospheric pressure, RV (Relife Valve) (15 -1,15-2) and close the USV (Upper Seal Valve) (14-1,14-2) to wait for the next import of ore. It will be repeated and charge about 125 Charges per day.

In the charging of blast furnace, the secondary charging nitrogen is expensive, and due to the frequent trouble of the facility, the pressure supplied to all parts of the steelworks is severely hunted, which greatly affects the operation. Excess nitrogen is used to supply and it is used more than necessary for the secondary charging, there is a problem affecting other facilities.

The present invention was devised to improve the above-mentioned conventional problem, and by recognizing ore species by type of ore charged in the blast furnace to compensate by the volume discharged by the type of ore which is charged into the furnace from the hopper, with ideal nitrogen usage Its purpose is to provide nitrogen compensation method for the hopper of the top hopper according to the characteristics of the blast furnace charge which can prevent the accident of the facility by increasing the supply of nitrogen to other facilities.

1 is a perspective view of a flow control pressure for charging a conventional blast furnace ore

2 is a control time chart of a conventional compensation equalization

3 is an overall perspective view for loading ore into the blast furnace;

4 is a perspective view of a volume compensation controller for each type of minerals when the ore is loaded into the blast furnace;

5 is a chart of the performance compensation compensation chart according to the present invention.

6 is a flow chart showing a control method according to the nitrogen compensation method of the present invention

7 is a detailed flowchart illustrating a control method according to the nitrogen compensation method of the present invention.

<Explanation of symbols for the main parts of the drawings>

1: Blast Furnace 2: Blowhole 3: DustCatcher

4: Bischoff Scrubber 10-1,10-2: Hopper

11-1,11-2: MCG (Meterial Flowrate Control Gate)

12-1,12-2: LSV (Lower Seal Valve)

13-1,13-2: Secondly Equalising Valve

14-1, 14-2: USV (Upper Seal Valve) 15-1, 15-2: RV (Relife Valve)

16-1.16-2: PEV (Premary Equalising Valve)

20: PLC (Programmable Logic Controller) 100: Controller

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

An embodiment of the nitrogen compensation method according to the present invention,

In the blast furnace (1) operation, the volume compensation control with nitrogen as the ore flows into the furnace (1) in the secondary charging process of the top charging device,

A communication controller for instrumentation control is installed in the process computer so that the operator can check the set amount of ore, and the link is linked to the PLC;

An operation step of calculating an overall base of the ore when the operator sets a different setting amount for each kind of ore when the operation index is changed;

After the set ore is imported from the raw material to the top hopper (Hopper) (10-1, 10-2) through the transport belt to recognize the type of ore imported to the hopper (10-1, 10-2) Light type recognition step;

Weighing measuring step of measuring the weight of the species based on the species (Coke, Ore, Small) imported to the top hopper (10-1, 10-2);

A pressure detecting step of detecting the present pressure of the blast furnace and the main pressure of nitrogen supplied to the factory when the measured weighing value is transmitted;

A calculation step of calculating a compensation amount of nitrogen by calculating a current ore discharge speed and a missing volume on the basis of the recognized mineral species when the charging start proceeds;

In order to supply the amount of nitrogen calculated for volume compensation at the time of charging, the opening degree of the nitrogen pressure fluctuations 16-1 and 16-2 is controlled, and the flow rate is controlled by detecting and comparing the current nitrogen flow rate at the controlled opening degree. Nitrogen flow control step,

When charging the ore into the furnace, it is desirable to enable the charging with an appropriate amount without expensive consumption of expensive nitrogen during nitrogen charging for smooth flow of the ore.

3 is an overall perspective view for loading ore into the blast furnace, FIG. 4 is a perspective view of a volume compensation controller for each type of mineral loading when the ore is charged into the blast furnace, FIG. 7 is a flowchart illustrating a control method according to the nitrogen compensation method of the present invention, and FIG. 7 is a detailed flowchart illustrating the control method according to the nitrogen compensation method of the present invention.

In the blast furnace operation, due to the change of the operation index and other situations, the operator sets the amount of ore according to the base through the process computer 110, and the operation proceeds to the value set here. The monitor 120 to monitor whether the charging is made properly

As the ore is transported through the transport belt for charging, as shown in FIG. 3, two hoppers 10-1 and 10-2 of the top are first selected in the standby state. The upper seal valve (14-1) performs the open operation, and after the import of the ore is completed to the end, one hopper (10-1) USV (upper seal valve) 14-1 is selected. Will be CLOSE.

When the Hopper (10-1) USV (Upper Seal Valve) 14-1 of the Hopper (10-1) confirms the completion of the CLOSE operation, the gravity sedimentation is completed in the Dust Catcher (3), which is the primary vibration damper, to load the ore into the furnace. When the gas damped with water in the bischoff scrubber (4), the primary vibration damper, opens the primary pressure equalizer (PEV) (16-1) to fill the hopper (10-1) pressure and reaches the nominal pressure of -0.05 g / ㎠ Close operation and open secondary secondary pressure transformer (SEV) (13-1) for smooth loading of ore into the blast furnace (1) and pressurize until the static pressure + 0.05g / ㎠ and the designated level according to the drop of ore If the specified level is detected by the level detector, the LSV (Lower Seal Valve) 12-2 is opened.When the set angle and the designated notch are reached, MCG 11-1 is opened. Will drop ore.

The ore imported to the top hopper (10-1) is “0” by the weighing device, and the MCG (11-1) is fully open to prevent the ore and dust from being caught in the seat, and immediately close the operation. The LSV 12-1 then closes to complete the charging operation.

The other side of the hopper (10-2), which is waiting, also imports the next mineral and performs the same charging and charging operation as in the previous step.

Hopper 10-1, 10-2 performs such a charging operation, respectively. At this time, if the ore is discharged from the raw material as a means to improve the conventional pressure equalization method, select the Hopper discharged from the raw material PLC (20) and transfer the value to the open-top PLC (Programmable Logic Controller) (20) 20 is a signal sent from the raw material PLC (20) to determine the type of light and send the value to the instrumentation signal controller (100), where the top PLC (20) is the conventional PEV (13-1) for the first equalization , 13-2) and the PEV (16-1,16-2) Close operation when the static pressure reaches -0.05g / ㎠ and open SEV (13-1,13-2) for the secondary pressure When the static pressure reaches + 0.05g / ㎠, it waits until the designated charging level is detected in that state.When the charging level is reached, the LSV (12-1,12-2) is opened and the designated angle and the designated notch If the MCG (11-1, 11-2) is open.

At this time, the main pressure of the current nitrogen (5.5) based on the top pressure (operating pressure: 2.55Kg / cm 2) detected by the instrumentation signal controller 100 with the wide type signal inputted from the stationary PLC 20 to the instrumentation signal controller 100. Kg / ㎠), and when the pressure is steady, calculate the volume of ore imported in the Hopper (10-1), the charging time by type, and the discharge rate of ore (㉰). In addition, the amount of nitrogen compensation is calculated based on Equation (1) so that the discharge volume according to the flow of ore can be compensated with nitrogen.

Import light (ton) * 3,600 (sec) / tilting rotation speed * set rotation speed * ore specific gravity = nitrogen compensation amount (Nm ² / Hr) --- Equation 1

부피 Volume by charge (based on current industry).

Coke: 22 Ton / Charge / 0.5 (Coke specific gravity) = 44㎥

Ore: 88 Ton / Charge / 2.2 (Sinter specific gravity) = 40㎥

Small: 23 Ton / Charge / 2.2 (Small Specific Gravity) = 10.4㎥

장 Charge time by type

Coke: 7.5 seconds / 1 rotation (Tilting rotation speed) * 12 rotation = 90 seconds / Charge

Ore: 7.5 seconds / 1 turn (Tilting rotation speed) * 10 turns = 75 seconds / Charge

Small: 7.5 seconds / 1 rotation (Tilting rotation speed) * 6 rotation = 45 seconds / Charge

㉰Charge speed by type

Coke: 44㎥ / 90 seconds = 0.48㎥ / second

Ore: 40㎥ / 75 seconds = 0.53㎥ / second

Small: 10.4㎥ / 45 seconds = 0.23㎥ / second

질소 Nitrogen amount compensated for loading

Coke: 0.48㎥ / sec * 3600 = 1728 ㎥ / Hr

Ore: 0.53㎥ / sec * 3600 = 1908 ㎥ / Hr

Small: 0.23㎥ / sec * 3600 = 828 ㎥ / Hr

As described above, when the volume of each charge, the loading time of each species, the loading speed of each species, and the amount of compensation nitrogen when loading the minerals are calculated, the instrumentation signal controller ( In step 100), the SEV (13-1, 13-2) valve opening value is output for each light type, and the compensated nitrogen amount is controlled while detecting the flow rate in the output opening degree. At this time, the operations of the SEVs 13-1 and 13-2, which are previously Full Open (FIG. 2), perform volume compensation control (FIG. 5) only as much as the output sent from the instrumentation signal controller 100.

When charging is complete, the volume compensation control circuit is ignored and the basic control is selected again.

Also, if the nitrogen pressure down phenomenon occurs in the oxygen factory, there is a risk of equipment accident when operating at the current set value, so the equalization method is changed as before when the nitrogen pressure is 3.0kg / ㎠ or less.

In the case of relatively rapid top pressure down, the equalizing method is selected as before.

As described above, the present invention has an effect that it can be economically operated because it can be charged only as long as there is no abnormality in the characteristics of the facility that excessively used nitrogen for charging the ore into the furnace during operation.

Hereinafter, the present invention will be described in more detail with reference to the following examples.

EXAMPLE

In the actual blast furnace operation, the nitrogen pressure is about 375 times a day in two hoppers (10-1, 10-2). Of these, it takes about 7.29 hours for pure charging. The required amount of nitrogen was found to be 36,450 N㎥ / day.

Therefore, in the case of Coke, for example, calculate the amount of nitrogen required to charge 1Charge

-. Coke volume: 22 (Ton / Charge) / 0.5 (Coke specific gravity) = 44 ㎥

-. Coke charging time: 7.5 (Sec / Tilting 1 rotation) * 12 (Rotation / Rotation rotation) = 90 Sec

-. Coke Charge Speed: 44 ㎥ / 90 Sec = 0.48 ㎥

-. Nitrogen compensation amount when loading coke: 0.48 ㎥ * 3600 Sec = 1,728 N㎥ / Hr

As above, the amount of nitrogen needed to charge Coke 1 Charge is 1,728 N㎥ / Hr However, in practice, it is used more than necessary by using 5,000 N㎥ / Hr which is full range.

The light species transported by the transport belt is analyzed by the stationary PLC 20 to transmit the light type signal to the instrumentation signal controller 100, and the instrumentation signal controller 100 analyzes the current peak pressure and nitrogen pressure to discharge the light type. As the volume of nitrogen is calculated according to the speed, the amount of nitrogen is changed differently, so the reliability of the volume compensation control system can be maximized as the most ideal compensation.

As described above, according to the present invention, it is possible to operate stably without any effect on actual operation even with a minimum amount of nitrogen, which is an expensive resource, and have an absolute effect of energy saving.

Claims (1)

In the blast furnace (1) operation, the volume compensation control with nitrogen as the ore flows into the furnace (1) in the secondary charging process of the top charging device, A communication controller for instrumentation control is installed in the process computer so that the operator can check the set amount of ore, and the link is linked to the PLC; An operation step of calculating an overall base of the ore when the operator sets a different setting amount for each kind of ore when the operation index is changed; After the set ore is imported from the raw material to the top hopper (Hopper) (10-1, 10-2) through the transport belt to recognize the type of ore imported to the hopper (10-1, 10-2) Light type recognition step; Weighing measuring step of measuring the weight of the species based on the species (Coke, Ore, Small) imported to the top hopper (10-1, 10-2); A pressure detecting step of detecting the present pressure of the blast furnace and the main pressure of nitrogen supplied to the factory when the measured weighing value is transmitted; A calculation step of calculating a compensation amount of nitrogen by calculating a current ore discharge speed and a missing volume on the basis of the recognized mineral species when the charging start proceeds; In order to supply the amount of nitrogen calculated for volume compensation at the time of charging, the opening degree of the nitrogen pressure fluctuations 16-1 and 16-2 is controlled, and the flow rate is controlled by detecting and comparing the current nitrogen flow rate at the controlled opening degree. Nitrogen flow control step, Nitrogen compensation method characterized in that the charging of the ore into the furnace to allow the flow of the ore to the smooth flow of the ore without the consumption of expensive nitrogen in the appropriate amount only to the required amount.