KR100340577B1 - Device for controlling the discharge and charge of fine particles through a standpipe of fluidized bed reactor - Google Patents

Abstract

In the gas-solid reaction process using two or more fluidized bed furnaces, the present invention impairs the flow of powder due to gas backflow that frequently occurs during the discharge / charge of fine particles through a standpipe between the fluidized bed furnaces. The present invention relates to a device for controlling the discharge and charging of powder in a standpipe with an improved fluidized bed so as to maintain the flow of powder while preventing dust.

The present invention is a facility for performing the discharge and charging of the powder through the front and rear stand pipes (104a, 104b) for communicating between the low pressure fluidized bed (100) and the high pressure fluidized bed (200), the The front and rear stand pipes 104a and 104b have a gas and material hermetically sealed first and second valve (2) and (3) such that the contents of the front stand pipe 104a are smaller than the contents of the rear stand pipe 104b. Is provided, and the front and rear stand pipes 104a and 104b are provided with a fluidized bed provided with a plurality of gas inlets P through which inert gas is blown, thereby providing a powder discharge and charging control device in the standpipe.

Description

DEVICE FOR CONTROLLING THE DISCHARGE AND CHARGE OF FINE PARTICLES THROUGH A STANDPIPE OF FLUIDIZED BED REACTOR}

In the gas-solid reaction process using two or more fluidized bed furnaces, the present invention impairs the flow of powder due to gas backflow that frequently occurs during the discharge / charge of fine particles through a standpipe between the fluidized bed furnaces. The present invention relates to a device for controlling the discharge and charging of powder in a standpipe with an improved fluidized bed so as to maintain the flow of powder while preventing dust.

In general, in two-stage gas-solid reaction processes, such as iron-iron ore fluidized-bed reduction reactors, the gas and powder flows are counter-flow. As shown in FIG. 1, that is, gas flows from a high pressure fluidized bed reactor (hereinafter referred to as a high pressure fluidized bed) 200 to a low pressure fluidized bed reactor (hereinafter referred to as a low pressure fluidized bed) 100, but the powder is a low pressure fluidized bed furnace. Since it flows from the 100 to the high-pressure fluidized bed 200, the discharge and charging of the powder is made through the standpipe 104 installed between the low pressure, high-pressure fluidized bed (100, 200), the discharge of such powder At the time of charging / initiation (especially when starting the operation and filling the low pressure fluidized bed reactor 100 and then discharged / loaded into the high pressure fluidized bed 200), the flow of powder may be disturbed by the reverse gas flow. Moreover, when the particle size distribution of the powder to be used is wide, the relatively small particle powder is scattered by the gas flowing back through the standpipe 104 and thus cannot flow from the low pressure fluidized bed reactor 100 to the high pressure fluidized bed reactor 200. Particle size classification by furnace may occur, resulting in non-fluidization phenomenon in the high pressure fluidized bed 200 and overfilling in the low pressure fluidized bed 100, resulting in a problem that the operation must be stopped eventually.

In addition, in order to prevent such a phenomenon, reducing the inner diameter of the standpipe 104 is likely to cause clogging.

Therefore, in the related art, when the opening and closing valve 105 is installed in the standpipe to fill the low pressure fluidized bed 100 at the start of operation, the valve 105 is closed and the first discharge / loading into the high pressure fluidized bed 200 is performed. The valve 105 can be opened or periodically operated by opening the valve, but this cannot fundamentally solve the problem caused by the backflow of gas.

Accordingly, the present invention has been made to solve the above problems, the object of which is to provide a plurality of valves in the standpipe, and if necessary to install a closed hopper between the valves when discharging / loading the powder in the standpipe An object of the present invention is to provide a device for controlling the discharge and charging of powder from a standpipe to a fluidized bed that blocks the flow of backflow gas and maintains the flow of powder by gravity to enable smooth operation.

1 is a schematic diagram showing a powder discharge and charging control device according to the prior art,

Figure 2 is a schematic diagram showing a first embodiment of the powder discharge and charging control device in the standpipe of the fluidized bed according to the present invention,

Figure 3 is a schematic view showing a second embodiment of the powder discharge and charging control device in the fluidized bed furnace standpipe according to the present invention.

* Explanation of symbols for the main parts of the drawings *

2 ........ 1st valve 3 ........ 2nd valve

4 ........ Hopper 100 ...... Low Pressure Fluidized Bed Furnace

101,201 ... Chapter 1,2 Entrance 102,202 ... 1,2 Gas supply port

103,203 ...... 1st and 2nd outlet 104a, 104b ...... Before and after stand pipe

200 ........ High pressure fluidized bed P ......... Gas inlet

The present invention as a technical configuration for achieving the above object,

In the equipment for discharging and charging the powder through the front and rear stand pipes connecting the low pressure fluidized bed and the high pressure fluidized bed,

The front and rear stand pipes are provided with a length of the front stand pipe shorter than the rear stand pipe so that the amount of powder of the contents filled in the front stand pipe is less than the amount of powder of the contents filled in the rear stand pipe. The closed first and second valves are installed, and the front and rear stand pipes are provided with a plurality of gas inlets through which inert gas is blown.

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

Figure 2 is a schematic diagram showing a first embodiment of the powder discharge and charging control device in the fluidized bed furnace standpipe according to the present invention, as shown, the powder through the first and second charges 101, 201 The front and rear stand pipes 104a and 104b are installed between the low pressure and high pressure fluidized bed passages 100 and 200, and the front end stand pipe 104a and the rear end stand pipe 104b are inserted between the front and rear stand pipes 104b. A gas and material hermetic first valve 2 is installed to control the flow of powder filled in the standpipe 104a, and the gas and material to control the flow of powder filled in the rear end pipe 104b are also provided. A material sealed second valve 3 is provided.

That is, the first and second valves (2) and (3) are provided so that the amount of powder which is the contents filled in the front end pipe 104a is smaller than the amount of powder which is the contents of the rear stand pipe 104b. The rear stand pipes 104a and 104b are provided with a plurality of gas inlets P to inject a high pressure inert gas for purging and flow.

Here, the second valve 3 is preferably installed in close proximity to the high pressure fluidized bed 200 so as to secure a sufficient amount of powder filled in the rear stand pipe 104b .

On the other hand, Figure 2 shows a second embodiment of the powder discharge and charging control device in the fluidized bed furnace standpipe according to the present invention, as shown, is provided in the front and rear standpipe 104a (104b) Between the first and second valves (2) and (3), the powder is stored in the low pressure fluidized bed (100) via the shear stand pipe (104a) when the first valve (2) is opened, and the second valve ( 3) is equipped with a closed hopper (4) to charge the powder stored in the high pressure fluidized bed 200 via the rear end pipe (104b) when the opening, the 1,2 valve (2) (3) is the In the vicinity of the front and rear ends of the sealed hopper 4, a gas inlet P through which an inert gas is blown is also provided in the front and rear stand pipes 104a and 104b as described above.

Referring to the operation and effects of the powder discharge and charging control device in the standpipe with a fluidized bed according to the present invention having the configuration as described above are as follows.

First, when the working gas is supplied to the second gas supply port 202 of the high pressure fluidized bed 200 before starting operation, it is continuously introduced into the first gas supply port 102 of the low pressure fluidized bed 100.

At this time, when the lengths of the standpipes 104a and 104b communicating between the low pressure fluidized bed 100 and the high pressure fluidized bed 200 are sufficiently secured, the front side first valve 2 and the rear side second valve (3) in the state of closing the powder raw material is first charged into the low-pressure fluidized bed through the first charge 101.

When the height of the raw material fluidized bed reaches the height of the first outlet 103 and the powder is sufficiently accumulated in the front stand pipe 104a between the first outlet 103 and the closed first valve 2, the closed first front side valve (2) is opened, and the powder accumulated in the front end stand pipe 104a is transferred into the rear end stand pipe 104b by gravity. At this time, since the second valve 3 which is kept closed during the powder transfer into the rear stand pipe 104b is provided in close proximity to the high pressure fluidized bed 200, the first and second valves 2 ( 3) A sufficient amount of powder can be secured in the rear stand pipe 104b between the two ends.

Subsequently, the first valve 2 is closed to wait for a predetermined time until the powder is sufficiently accumulated in the front stand pipe 104a, and the second valve 3, which has been closed, is opened to operate the rear stand pipe ( 104b) is charged into the high pressure fluidized bed 200 through the second charging inlet 201 without gravity flow through the second charging inlet 201, and the second valve (3) is closed when charging is completed. Return to its original state.

On the other hand, when the length of the front and rear end pipes 104a and 104b provided between the low pressure and high pressure fluidized bed passages 100 and 200 is not sufficiently secured, the front side first valve 2 is opened and the rear end side. After the second valve 3 is closed, the powder material is charged into the low pressure fluidized bed passage 100 through the charging hole 101, and the height of the fluidized bed reaches the height of the first discharge port 103 so that the front and rear stand pipes are high. When sufficiently stacked in the 104a and 104b, the opened first valve 2 is closed and the second valve 3 is opened to allow the front and rear stand pipes 104a between the first and second valves 2 and 3 to be opened. The powder accumulated in the 104b can be charged to the high pressure fluidized bed 200 by gravity without disturbing the flow of the powder due to the backflow of the gas, and when the charging is completed, the second valve 3 is closed and the first valve 2 is closed. Open and wait until the powder is sufficiently accumulated in the front and rear stand pipes (104a, 104b).

By repeating the opening and closing operations of the first and second valves (2) and (3) as described above, when the raw material is filled in the high-pressure fluidized bed 200 and discharged through the second outlet 203, the normal operation is reached. Operation is performed while the first and second valves (2) and (3) are all open, and the discharge / loading of the powder through the front and rear stand pipes 104a and 104b is poor due to gas backflow. When released, the first and second valves (2) and (3) open and close in the same manner as above to perform the operation. If clogging occurs in each of the front and rear stand pipes 104a and 104b in the operation of opening and closing the first and second valves 2 and 3, the front and rear stand pipes 104a and 104b may be closed. Blow up the high-pressure inert gas through the inlet (P) installed in each element to solve clogging.

On the other hand, in the case of using the second embodiment of the present invention as shown in FIG. 3, the operation gas is started through the second gas supply port 202 and the first gas supply port 101 as described above. The powder raw material is introduced into the low pressure and high pressure fluidized bed passage (100) (200) through the first inlet (101) while the front side first valve (2) is opened and the rear side second valve (3) is closed. After charging to the fluidized bed furnace 100, when the height of the fluidized bed reaches the height of the first outlet 103, the powder via the front end stand pipe 104a is stored in the sealed hopper 4 by weight.

When the powder is sufficiently stored in the hopper 4 disposed between the first and second valves 2 and 3, the first valve 2 provided on the front side of the hopper 4 is closed while the hopper 4 is closed. The second valve installed at the rear end is opened, and the powder stored in the hopper 4 is charged into the high pressure fluidized bed 200 in a total gravity manner. At this time, since the gas flowing back from the high pressure fluidized bed 100 to the low pressure fluidized bed 100 is blocked by the closed first valve 2, the gas flow is not affected at all.

When the charging of the powder is finished, the second valve 3 is closed again, and the first valve is opened again to wait for the powder to be sufficiently stored in the empty hopper, which is moved to the entire high pressure fluidized bed 200. . In addition, when clogging occurs in the front and rear stand pipes 104a and 104b during the operation of opening and closing the first and second valves, the inert gas is blown through the gas inlet P installed in each element. Open the flow path.

According to the present invention as described above, when the powder is transferred from the low pressure fluidized bed furnace to the high pressure fluidized bed furnace through the stand pipe, the first and second valves installed in the stand pipe and the hopper installed therebetween are selectively opened. The gas flow in the fluidized bed furnace prevents the flow disturbance of the powder frequently generated by the gas flowing back to the low pressure fluidized bed furnace, so that the powder flow can be stably maintained, so that the operation can be performed without the conventional non-fluidization phenomenon and the overload phenomenon in the low fluidized bed furnace. The effect that can be performed stably is obtained.

Claims (3)

In a facility for discharging and charging the powder through the front and rear stand pipes (104a, 104b) for communicating between the low pressure fluidized bed (100) and the high pressure fluidized bed (200), The front and rear stand pipes 104a and 104b have a length of the front stand pipe 104a that is shorter than the rear stand pipe 104b so that the amount of powder content of the contents to be filled in the front stand pipe 104a is the rear end stand. Gas and material sealed first and second valves (2) and (3) are installed to be smaller than the powder content of the contents filled in the pipe (104b), and inert gas is applied to the front and rear stand pipes (104a) and (104b). Control device for discharging and charging the powder in the standpipe, characterized in that a plurality of blown gas inlet (P) is installed. The method of claim 1, Between the first and second valves (2) and (3), powder is stored in the low pressure fluidized bed (100) via the shear stand pipe (104a) when the first valve (2) is opened, and the second valve ( 3) When the opening of the fluidized bed characterized in that it is equipped with a closed hopper (4) to charge the stored powder via the rear end pipe ( 104b) to the high-pressure fluidized bed 200, discharge and charge the powder in the standpipe Control unit. The method of claim 1, The second valve (3) is discharged in the fluidized bed furnace standpipe, characterized in that it is installed in close proximity to the high pressure fluidized bed 200 so as to ensure a sufficient amount of powder filled in the rear stand pipe (104b) and Charge control device.