KR20030052393A - An apparatus for treatment of the fallen below grid in fluidized beds reactor for reduction of iron ore fines - Google Patents

Abstract

PURPOSE: A falling ore treating apparatus is provided to prevent a nozzle of a gas dispersing plate from being clogged by discharging falling ore to an exterior before falling ore is attached to the nozzle of the gas dispersing plate. CONSTITUTION: A falling ore treating apparatus includes a falling ore bin(41) and a controller(46). An outer surface of the falling ore bin(41) is connected to the other end of an ascending pipe(42), which is connected to a wall of a fluid bed reactor(10). The falling ore bin(41) is also connected to the other end of a gas exhaust pipe(44), which is connected to a gas discharging pipe(13). Pressure in the falling ore bin(41) is maintained lower than pressure at a lower portion of a gas dispersing plate(12). The controller(46) intermittently opens or closes a falling ore discharging valve formed in the ascending pipe(42) and a gas exhaust valve formed in the gas exhaust pipe(44). Pressure at the lower portion of the gas dispersing plate(12) is measured by a first pressure meter(47) and pressure in the falling ore bin(41) is measured by a second pressure meter(48).

Description

TECHNICAL APPARATUS FOR AN FLOWED FUEL FLOOR {AN APPARATUS FOR TREATMENT OF THE FALLEN BELOW GRID IN FLUIDIZED BEDS REACTOR FOR REDUCTION OF IRON ORE FINES}

The present invention relates to an apparatus for treating falls in a fluidized bed furnace, and more particularly, in a gas-solid reaction process using a fluidized bed furnace, a gas dispersed by discharging the falling rocks generated under the gas distribution plate installed in the fluidized bed furnace as a riser. The present invention relates to an apparatus for treating falling light in a fluidized bed furnace to prevent nozzle clogging of a plate.

In general, the iron ore fluidized-bed reduction reactor (hereinafter referred to as the fluidized bed) is a gas-powder reaction process in which gas and powder react with each other in the fluidized bed furnace, as shown in FIG. 10 is passed through the gas inlet pipe 11 connected to the lower portion of the through the gas distribution plate 12 and discharged to the gas discharge pipe 13 of the upper to the fluidized bed, but the iron ore powder is charged in the ore charge pipe in the charging bin (20) Ore charged into the fluidized bed furnace 10 through 14 and flow-reduced or reduced by the gas introduced from the bottom is discharged to the outside through the ore discharge pipe 15.

In this process, when the operation of the gas is unstable or temporarily interrupted, ores on the gas distribution plate 12 do not flow properly and fall on the gas distribution plate 12 by their own weight, some of which Through the nozzle of the gas distribution plate 12, the lower portion of the gas distribution plate 12 is moved downward and remains under the gas distribution plate 12.

However, when the operation is normalized again and the gas is normally introduced again through the gas introduction pipe 11, the falling light falling to the lower portion of the gas distribution plate 12 flows by the introduced gas, the gas being the only passage. Through the nozzle of the distribution plate 12 is to move to the upper portion of the gas distribution plate 12.

During this process, some ore is attached to the inner surface of each nozzle of the gas distribution plate 12 to reduce its inner diameter. As a result, the gas supply to the upper portion of the gas distribution plate is not smooth, and thus, the distribution plate differential pressure increases. In the upper part of the gas distribution plate 12, the flow of the iron ore is not smooth, and the operation is often stopped eventually.

Therefore, the present invention has been proposed to solve the conventional problems as described above, the object of which is to attach to the gas distribution plate nozzle during the movement by the gas flow to the top of the gas distribution plate when operating fall fall down the gas distribution plate It is to provide a fall light treatment apparatus in a fluidized bed furnace to prevent the operation interruption by clogging the nozzle of the gas distribution plate by discharging to the outside by using the pressure at the bottom of the dispersion plate before the end.

1 is a block diagram showing a typical fluidized bed furnace,

2 is a block diagram showing an apparatus for treating falls in a fluidized bed furnace according to the present invention.

Explanation of symbols on the main parts of the drawings

10 ..... Fluidized Bed Furnace 12 ..... Gas Dispersion Plates

13 ..... gas discharge pipe 14 ..... ore charge pipe

15 ..... Ore drain pipe 30 ..... Scrubber

41 ..... Nakwang Bin 42 .....

43 ..... Exhaust exhaust valve 44 ..... Exhaust gas pipe

45 ..... exhaust gas valve 46 ..... controller

47,48 ... 1,2 pressure gauge 49 ..... flow meter

As a technical configuration for achieving the above object, the present invention,

It is equipped with an ore charge and discharge pipe in which charge iron ore is charged and discharged, and a gas introduction and discharge pipe in which gas is introduced and discharged, while an ore supplied downward through the ore charge pipe is upwardly supplied through the gas introduction pipe. In a fluidized bed furnace having a gas distribution plate through which gas passes to form a fluidized bed by interaction with gas, and reducing iron ore,

The other end and the outer surface of the riser pipe is connected to the furnace wall of the fluidized bed passage lower than the installation height of the gas distribution plate, and the other end of the exhaust pipe is connected to the other end of the exhaust pipe and the powder transfer is possible The felling discharge valve of the rising pipe and the exhaust gas valve of the exhaust gas pipe are intermittently connected to each other so as to maintain a lower pressure in the falling light container than the pressure of the lower portion of the gas dispersion plate, and to transport the falling light into the falling container. In order to control the cross-opening and repetition repeatedly, a pressure measurement value is received from a first pressure gauge for measuring the pressure of the lower part of the gas distribution plate and a second pressure gauge for measuring the pressure of the fall light bin, and compares the pressure values. It characterized in that it is discharged to the outside of the lower fall to the outside of the nozzle so as not to adhere to the nozzle of the gas distribution plate A camel light treatment device in a same layer as the by maryeonham.

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

FIG. 2 is a block diagram showing an apparatus for treating falls in a fluidized bed furnace according to the present invention. As shown in FIG. 2, the apparatus 1 of the present invention has a lower portion of the gas distribution plate 12 of the fluidized bed furnace 10. By dropping the falling light fall into the nozzle of the gas distribution plate 12 when restarting the operation, it is quickly discharged to the outside to maintain normal operation, such a device (1) is the falling light bin (41) And controller 46.

That is, the fall light bin 41 is a storage tank installed between the fluidized bed furnace 10 and the gas discharge pipe 13 through which the flow reaction of gas and powder is performed, and between the knocked light bin 41 and the fluidized bed furnace 10 is A rising pipe 42 having one end connected to the furnace wall of the fluidized bed 10 lower than the installation height of the gas distribution plate 12 provided in the fluidized bed 10, and the other end connected to the falling light bin 41. In addition, the rising pipe 41 is provided with a fall light discharge valve 43 which is opened and closed by the controller 46 to control the flow flow.

In addition, one end is connected between the falling light bin 41 and the gas discharge pipe 13 to a gas discharge pipe 13 through which the exhaust gas discharged from the fluidized bed 10 flows, and the other end communicates with the falling light bin 41. The exhaust gas pipe 44 to be connected is provided and configured, and the exhaust gas pipe 44 is also equipped with an exhaust gas valve 45 which is opened and closed by an operation signal of the controller 46.

On the other hand, the controller 46 is connected to the first pressure gauge 47 installed in the fluidized bed 10 so as to measure the pressure of the lower portion of the gas distribution plate 12, the pressure value measured is received, A control member which is also electrically connected to a second pressure gauge 48 installed to measure the pressure of the falling light bin 41 and receives the measured pressure value, which is lower than the pressure under the gas distribution plate 12. Relatively lowering the pressure in the fall light discharge discharge port 43 of the riser pipe 42 so that the fall does not pass through the nozzle of the gas distribution plate 12, the air flows through the riser pipe 42 into the fall light bin (41) ) And the exhaust gas valve 45 of the exhaust gas pipe 44 intermittently cross-opening control.

In addition, a drain line (not shown) having a drain valve may be disposed below the light dropping bin 41 so as to process the falling light remaining after the falling light is discharged to the gas discharge pipe 13 through the exhaust gas pipe 44. good. However, the drain valve should be opened after the internal pressure is kept sufficiently low, such as at the end of an operation or at a temporary idle.

In addition, the gas discharge pipe 13 includes a flow meter 49 for detecting a gas flow rate discharged therethrough, and the gas flow rate detected by the flow meter 49 is directly above the gas distribution plate 12 in the controller 46. When the gas flow rate is lowered to 1 m / s or less, the exhaust gas of the exhaust gas pipe 45 of the fall light bin 41 maintained at a lower level than the lower pressure of the gas distribution plate 12 in the controller 46. The valve 44 is closed, and the falling light discharge valve 43 of the rising pipe 42 is opened and closed instantaneously so that the falling light falls using the pressure difference between the lower part of the gas distribution plate 12 and the falling light bin 41. Allow it to flow into the light bin 41. Thereafter, in order to lower the pressure of the light dropping bin 41, the exhaust gas valve 45 of the light dropping bin 41 is opened to decrease the pressure and then close. This process is performed intermittently or repeatedly so that the falling light of the lower portion of the gas distribution plate 12 can be effectively transported to the falling light bin 41 through the rising pipe 43.

The operation and effects of the present invention having the configuration as described above will be described.

First, the ore is charged into the fluidized bed 10 through the ore charge pipe 14, and the gas is introduced into the lower part of the fluidized bed 10 through the gas introduction pipe 11 and installed in the vicinity of the lower gas distribution plate ( It is uniformly supplied to the fluidized bed via the nozzle of 12).

After completion of the reaction in the fluidized bed furnace 10, the gas discharged to the outside through the gas outlet 13 is equipped with a scrubber (Scrubber) mounted to the end of the gas outlet 13 to process the fine powder remaining in the gas before discharged By passing through 30, the fine powder is collected and discharged by the water sprayed from the scrubber 30, and only the clean exhaust gas is discharged to the outside.

In addition, the ore charged into the fluidized bed furnace 10 is flow-reduced by the gas supplied from the lower portion of the gas distribution plate 12, the reduced ore is discharged to the outside through the ore outlet 15, in this process If the gas supply into the fluidized bed 10 is not constant and unstable or abruptly stopped, the ferrite ore that has flowed on the upper portion of the gas distribution plate 12 is moved by its own weight onto the surface of the gas distribution plate 12. The sitting iron ore having a particle size smaller than the nozzle inner diameter of the gas distribution plate 12 passes through the nozzle and falls to the lower portion of the gas distribution plate 12.

At this time, the measured value of the flow meter 49 mounted on the exhaust gas pipe 13 of the fluidized bed 10 is lowered, and the measured value is transmitted to the controller 46.

The falling light is attached to the nozzle inner wall in the process of ascending to the upper portion of the gas distribution plate 12 through the nozzle of the gas distribution plate 12 which is the only passage in the normal supply of the gas through the gas introduction pipe 11. The inner diameter gradually narrows down. As a result, the gas supply through the nozzle of which the inner diameter is narrowed is relatively increased, thereby gradually increasing the differential pressure in the gas distribution plate 12, and finally, the gas supply through the gas distribution plate 12 is smoothly made. The operation of charged iron ore while not supported is not performed properly and the operation is stopped.

Therefore, the apparatus 1 of the present invention is the gas supply when the gas supply is normally performed through the gas inlet pipe 11 in the state in which a fall occurs in the lower portion of the gas distribution plate 12 due to the anxiety and interruption of the gas supply. The fall light is discharged to the outside through the riser so that the fall light existing in the lower part of the dispersion plate 12 does not adhere while passing through the nozzle.

That is, when the gas is re-introduced through the gas introduction pipe 11, the controller 41 immediately transmits an electrical signal to the falling light discharge valve 43 installed in the rising pipe 42 to open it, while the gas discharge pipe is opened. An electrical signal is also sent to the exhaust gas valve 45 of the exhaust gas pipe 44 communicating with (13) to close it.

In this case, the internal pressure of the light dropping bin 41 to which the rising pipe 42 is connected is lower than that of the gas dispersing plate 12 so that the pressure difference is lower than the pressure of the gas dispersing plate 12. The fallen light fall is conveyed into the light fall bin 41 through the rising pipe 42, and discharged. At this time, by adjusting the opening and closing time of the fallout discharge valve 43, it is possible to instantaneously discharge the falllight through the riser pipe 42 into the fallout bin 41 without disturbing the entire gas flow.

In addition, as described above, when the fall light is conveyed by the pressure difference from the lower portion of the gas distribution plate 12 having a high pressure to the open light fall discharge valve 43 due to the pressure difference, the fall fall bin 41, The pressure inside the light bin 41 gradually increases, and the pressure in the lower portion of the gas distribution plate 12 and the pressure in the light dropping bin 41 become equal to each other. 47) and the pressure measurement values measured in the second pressure gauge 48 installed in the light dropping bin 41 are compared with each other in the controller 46, and the pressure drop no longer falls into the light dropping bin 41 due to the pressure difference. The transmission of light becomes impossible.

Therefore, in order to prevent this in advance, the first pressure gauge 47 and the second pressure gauge 48 are always compared in the controller 46, so that the falling light discharge valve 43 and the exhaust gas valve 45 are intermittently maintained so that a constant pressure difference is maintained. Or by repeatedly opening and closing the gas dispersion plate 12 by the pressure difference to the light dropping bin 41 through the ascending pipe 43 effectively by opening and closing each other crosswise and repeatedly. The supplied gas is uniformly supplied to the upper portion of the gas distribution plate through the nozzle to form a stable fluidized bed.

On the other hand, since the operation of discharging the falling light collected in the falling light bin 41 is higher than the pressure of the gas discharge pipe 13 than the internal pressure of the falling light bin 41, the rising pipe 42 using this pressure difference. When the falling-drain valve 43 of the exhaust gas valve 45 of the exhaust-gas pipe 44 connected between the gas discharge pipe 13 and the falling-kwang bin 41 in the closed state through the controller 46, The falling light collected in the light bin 41 can be discharged to the gas discharge pipe 13 through the exhaust gas pipe 44 by the pressure difference, and the exhaust gas together with the falling light discharged into the gas discharge pipe 13 is the exhaust gas dust collecting processing device. While passing through the scrubber 30, the exhaust gas is separated into clean exhaust gas and fine powder, and the exhaust gas is discharged to the outside, and the fine powder is wet-dusted to be discharged externally in the form of sludge.

When the internal pressure of the light dropping bin 41 is lowered to an atmospheric pressure state, the exhaust gas valve 45 of the exhaust gas pipe 44 which is opened is closed to operate to generate the falling light generated under the gas distribution plate 12. Maintaining an atmospheric pressure lower than the pressure of the lower portion of the gas distribution plate 12 so that the operation to discharge the air to the riser can be repeated.

Then, the exhaust gas pipe 44 of the falling light bin 41 is connected to the gas discharge pipe 13 at the front of the scrubber 30, or the pressure difference between the lower portion of the gas distribution plate 12 and the falling light bin 41 is increased. Another scrubber is installed to discharge the fall light more effectively and quickly, and the exhaust gas pipe 44 is connected thereto to collect the fine powder contained in the exhaust gas of the fall light bin 41 to be connected to the stack and exhausted.

<Example>

1) Specification and condition of reduction device

end. Low / High Pressure Fluidized Bed Furnace

-Reduction part (distribution plate) inner diameter: 0.2m

-Enlarged part inner diameter: 0.4m

-Conical bottom angle: 5 °

-Slope height (from gas distribution plate surface): 1.1m

I. Riser

-Inner diameter: 50mm

-Tilt angle: 60 ° (based on ground surface)

All. Raw material

Powder: Iron ore (-8mm)

-Chemical composition-

T. Fe: 62.17%, FeO: 0.51%, SiO ₂ : 5.5%, TiO ₂ : 0.11%, Mn: 0.05%, S: 0.012%, P: 0.65%, Crystalline water: 2.32%

-Particle size distribution-

-0.05mm: 4.6%, 0.05-0.15mm: 5.4%, 0.15-0.5mm: 16.8%, 0.5-4.75mm: 59.4%, 4.75-8mm: 13.8%

gas

Chemical Composition

CO: 65%, H ₂ : 25%, CO ₂ : 5%, N ₂ : 5%

-Temperature: High Pressure Flow Reduction Furnace: 850 ℃

-Flow rate: 1.3 to 1.5 m / s (distributed plate)

Pressure: 2.0∼2.5 bar, g

By comparing the experimental results according to whether the installation of the riser 42 which can handle the fall of the lower part of the gas distribution plate 12 when performing the experiment by operating the fluidized bed furnace of the iron ore under the above experimental conditions. Same as

Table 1 below shows the experimental results in the fluidized bed furnace of the present invention in which the apparatus for treating falls is provided through the gas riser pipe, and in the conventional fluidized bed furnace not provided, and in the case of installing the rising pipe 42, Stable operation duration is also greatly increased afterwards to maintain 1.5 times or more, and at the same time, the differential pressure in the gas distribution plate 12 is very stable and continuously low.

Conventional Fluidized Bed Furnace In the case of a fluidized bed furnace employing the apparatus of the present invention Total duration of experiment (hr) 37 56 Frequency of gas flow defect 5 5 Number of lift valve openings and closings 0 11 Gas dispersion plate differential pressure (mbar) at the end of the experiment 165 54

According to the present invention as described above, when the gas supply is interrupted and the operation abnormality, the falling of the falling light generated in the lower portion of the gas distribution plate to the fluidized bed by the operation restart pressure through the rise pipe through the rising pipe to discharge the falling light, It is possible to prevent the phenomenon of the nozzle of the gas distribution plate that is introduced to be blocked by falling light, thereby achieving an effect that can continuously maintain the operation.

While the invention has been shown and described with respect to specific embodiments thereof, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit or scope of the invention as set forth in the claims below. I would like to clarify that knowledge is easy to know.

Claims (3)

It is equipped with the ore charge and discharge pipe 14 and 15 which charge and discharge of a ferrous iron ore, and the gas introduction and discharge pipe 11 and 13 which introduce and discharge gas are provided, and through the ore charge pipe 14, A fluidized bed furnace (10) having a gas distribution plate (12) through which the gas passes to form a fluidized bed by interaction between a gas supplied upwardly through the gas introduction pipe (11) and a gas supplied downward (10) (10) ), The other end and the outer surface of the rising pipe 42, one end of which is connected to the furnace wall of the fluidized bed 10 lower than the installation height of the gas distribution plate 12 is connected in communication, one end is connected to the gas discharge pipe (13) The falling light bin 41 is connected in communication with the other end of the exhaust gas pipe 44 to enable powder transfer, and the pressure in the falling light bin 41 is kept lower than the pressure under the gas distribution plate 12. (41) cross-cutting control of the falling-out exhaust valve of the upcoming pipe and the exhaust-gas valve of the exhaust pipe to intermittently or repeatedly so that the falling of the sky flows, and to measure the pressure of the lower part of the gas distribution plate 12 to control this. The pressure measurement value is received from the first pressure gauge 47 and the second pressure gauge 48 for measuring the pressure of the light dropping bin 41, and the controller 46 is provided to compare the pressure values. On the nozzle to prevent falling light Camel light treatment device in a fluidized bed to the light, characterized in that the discharge process to the outside. The method of claim 1, The gas discharge pipe 13 includes a flow meter 49 for detecting a gas flow rate discharged therethrough, and the gas flow rate detected by the flow meter 49 is directly above the gas distribution plate 12 in the controller 46. When the gas flow rate falls below 1 m / s, the controller 46 continuously maintains the pressure of the light dropping bin 41 lower than the lower portion of the gas distribution plate 12 and controls the exhaust gas valve 44 of the exhaust gas pipe 44. 45) and only the fall discharge valve 43 is instantaneously opened and closed in the state where the fall discharge valve 43 is closed, so that a fall light is transferred from the lower portion of the distribution plate to the fall light bin 41 through the riser pipe 42 due to the pressure difference. Since the pressure of the fallout bin 41 is increased by opening and closing the fallout discharge valve 4, the exhaust gas valve 45 is opened to bring the pressure of the fallout bin 41 to the level before the opening of the fallout discharge valve. If lowered, the exhaust gas valve 45 is closed, and then the light drop valve Opening and closing of the bar is carried out intermittently or repeatedly so that the falling light of the lower part of the gas distribution plate is discharged to the falling light bin 41 through the rising pipe by the pressure difference between the lower part of the gas distribution plate and the falling light bin. Light fall treatment apparatus in a fluidized bed furnace characterized by the above-mentioned. The method according to claim 1 or 2, The exhaust gas pipe 44 of the fall light bin 41 is connected to the gas discharge pipe 13 at the front end of the scrubber 30, or the pressure difference between the lower portion of the gas distribution plate 12 and the light fall bin 41 is increased. Another scrubber is installed to discharge the gas more effectively and quickly, and the exhaust gas pipe 44 is connected thereto to collect and collect the fine powder contained in the exhaust gas of the falling light bin 41 to be connected to the stack for exhausting. Falling light treatment apparatus in a fluidized bed furnace.