KR100544576B1 - Injection method of ore particles - Google Patents

Abstract

The present invention relates to a method for injecting ore particles into the riser (reactor) through the U-shaped conduit (loop chamber), which is a non-mechanical valve. By appropriately controlling the present invention, there is provided a method for stably injecting ore particles into the riser.

The present invention injects the ore particles into the riser through a U-shaped conduit including a vertical portion in which the ore particles are introduced, a weir portion in which the ore particles are discharged, and a horizontal portion connecting the vertical portion and the wear portion in an ore particle communication relationship. In the way,

When injecting ore particles into the riser through the vertical part, the horizontal part, and the weir part of the U-shaped conduit, gas is injected from the horizontal part bottom from the outer part of the weir part to the center of the horizontal part, and the bottom part and the upper part of the horizontal part. The gist of the ore particles is characterized in that the gas is injected from the outer portion of the vertical portion therebetween.

Ore particles, injection, U-shaped conduits, risers (reactors), gas injection, non-mechanical valves

Description

Injecting Ore Particles {Method for Injecting Ore Particles}

1 is a schematic view showing a conventional J-shaped non-mechanical solid re-injection apparatus

Figure 2 is a schematic diagram schematically showing a non-mechanical solid re-injection apparatus installed in the vertical tangential air injection portion in the vertical portion of the conventional U-shaped conduit

Figure 3 is a schematic diagram schematically showing a U-shaped non-mechanical solid re-injection apparatus used in the present invention

Figure 4 is a graph showing the pressure change signal due to the solid flow in the riser when the air is injected according to the conventional method

5 is a graph showing the pressure change signal due to the solid flow in the riser when air is injected from the improved air inlet of the non-mechanical valve according to the present invention.

Explanation of symbols on the main parts of the drawings

1, 11, 21. . . Vertical sections 2, 12, 22. . . Horizontal section 3, 18, 23. . . Vertical injection section

5, 25. . . Horizontal injection section 7, 17, 27. . . Riser 24. . . Wear Department

The present invention relates to a method of injecting ore particles into the riser (reactor) through the U-shaped conduit (loop chamber), which is a non-mechanical valve, and more specifically to a U-shaped conduit (loop chamber), which is a non-mechanical valve. The present invention relates to a method for stably injecting ore particles by appropriately controlling the injection position of the gas when the ore particles are injected into the riser (reactor).

The valves applied to the method for injecting solids such as ore particles into the reactor include mechanical valves for controlling the solid flow by the mechanical driving unit according to the particle flow rate control method and non-mechanical valves controlled by the air or gas injection amount.

In particular, when operating at high temperature and high pressure, there are many non-mechanical valves without mechanical driving parts, low manufacturing and maintenance costs, and no sealing problems.

Non-mechanical valves are now widely used in circulating fluidized beds where reinjection of particles into the reactor is essential.

Examples of the development of such a non-mechanical solid reinjection apparatus include US Patent No. 4,951,612 and Korean Patent No. 0250625.

U. S. Patent No. 4,951, 612 discloses a non-mechanical solid reinjection device in the form of a roof seal.

The non-mechanical solid re-injection device is configured such that the horizontal and vertical portions of the conduit form a J-shape, and injects air into the horizontal and vertical portions of the conduit so that the solid particles can flow to reinject the solid into the riser. do.

That is, as shown in Figure 1, the non-mechanical solid re-injection device in the device for delivering the solid collected in the cyclone (not shown) to the riser (7), the vertical portion 1 and the horizontal portion (2) J-shaped conduit composed of a), characterized in that the air inlet portion 3 of the vertical portion of the conduit and the air inlet portion 5 of the horizontal portion of the conduit.

On the other hand, the Republic of Korea Patent No. 0250625 has a J-shaped conduit consisting of the horizontal portion and the vertical portion of the conduit, the air injection portion of the vertical portion of the electrical conduit of 30 ° to 50 ° in the solid flow direction with respect to the vertical wall of the conduit A non-mechanical solid refilling device is disclosed which is configured to incline and inject air in a tangential direction.

That is, the non-mechanical solid re-injection apparatus, as shown in Figure 2, in the device for transferring the solid collected in the cyclone (not shown) to the riser 17, the vertical portion 11 and the horizontal portion 12 J-shaped conduit consisting of, characterized in that the air inlet portion 18, the lower tangential air inlet portion 14, and the air inlet portion 15 of the horizontal portion of the conduit is provided with a vertical portion of the conduit.

The conventional non-mechanical solid reinjection apparatuses inject the particles into the riser by controlling the amount of gas injected into the riser while maintaining the entire horizontal portion in a minimum fluidized state or above.

In this case, particles with good fluidity such as sand particles or FCC particles can be stably reinjected into the riser.

However, when injecting ore particles having a relatively low flowability by using the conventional non-mechanical solid reinjection apparatuses described above, the flowability is considerably lowered, so that the gas in the vertical tube is maintained while maintaining the entire horizontal portion at the minimum fluidization state or higher. In the case of injection, a large bubble is formed in the vertical tube so that the flow of solid particles becomes unstable or the particles are not re-injected into the riser, which makes it impossible to operate the operator.

An object of the present invention is to provide a method for stably injecting ore particles into a riser by appropriately controlling a gas injection position when injecting ore particles into a riser through a U-shaped conduit.

The present invention injects the ore particles into the riser through a U-shaped conduit including a vertical portion in which the ore particles are introduced, a weir portion in which the ore particles are discharged, and a horizontal portion connecting the vertical portion and the wear portion in an ore particle communication relationship. In the way,

When injecting ore particles into the riser through the vertical part, the horizontal part and the weir part of the U-shaped conduit, the gas is injected through the horizontal injection part provided at the bottom of the horizontal part from the outer part to the center of the horizontal part, and The present invention relates to an ore particle injection method comprising injecting gas through a vertical injection portion provided at an outer portion of a vertical portion between a bottom portion and an upper portion of the horizontal portion.

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

As shown in FIG. 3, the present invention provides a vertical portion 21 into which the ore particles are introduced, a weir portion 24 from which the ore particles are discharged, and a vertical portion 21 and the wear portion 24. It is applied to a method of injecting the ore particles into the riser 27 through the U-shaped conduit including a horizontal portion 22 for connecting in communication.

In the present invention, when the ore particles are injected into the riser 27 through the vertical portion 21, the horizontal portion 22, and the wear portion 24 of the U-shaped conduit, the outer portion 24a of the wear portion 24. A horizontal injection portion 25 is provided at the horizontal portion bottom portion 22a to the center of the horizontal portion 22 to inject gas, and the outer portion of the vertical portion between the bottom portion 22a and the upper portion 22b of the horizontal portion. By injecting gas with the vertical injection portion 23 provided at 21a, the ore particles can be stably injected into the riser 27.

Examples of the gas include air or inert gas.

Hereinafter, the position selection of the gas injection unit in the present invention will be described.

The gas injected through the horizontal injection unit 25 provided in the horizontal tube 22 allows the particles in the horizontal tube to have fluidity so that the particles can be injected into the riser 27.

At this time, the amount of gas injected through the horizontal inlet 25 of the horizontal tube 22 cannot inject sufficient ore particles into the riser 27, so that the vertical injection unit provided in the vertical unit 21 ( The amount of ore particles injected into the riser 27 is adjusted by varying the amount of gas injected through 23.

However, in the case of ore particles, when air is injected from two horizontal injection portions 25 and 35 provided at the horizontal portion of the conduit, the ore particles are initially injected by forming a large bubble in the vertical tube 21. It has been observed that the flow of the ore is very unstable or not injected into the ascension tube.

Therefore, when the ore particles are injected into the riser 27, the gas is injected into the horizontal portion 25a of the horizontal portion bottom portion 22a from the outer portion 24a of the wear portion 24 to the center of the horizontal portion 22. ), Gas should be injected.

On the other hand, according to the existing studies, it is reported that the gas injection portion of the vertical portion is preferably installed at a height corresponding to 2.0 to 2.5 times the diameter of the horizontal portion of the conduit from the horizontal portion of the conduit.

However, in the case of injecting air from the vertical portion at a height corresponding to 2.0 to 2.5 times the diameter of the horizontal portion of the conduit (corresponding to the vertical injection portions 28, 38 and 48 in FIG. 3), Large bubbles or slugs are formed in the part and the flow of solid particles is very unstable.

Therefore, in the present invention, the injection of the gas in the vertical portion should be provided with a vertical injection portion 23 in the outer portion 21a of the vertical portion between the bottom portion 22a and the upper portion 22b of the horizontal portion.

As used herein, the riser refers to a reactor in which a gas and a solid react, and examples thereof include a fluidized bed furnace.

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

(Example)

Ore particles having a particle size distribution and an apparent density as shown in Table 1 below were injected into a riser having a size as shown in Table 2 using a U-shaped conduit having a size as shown in Table 2 below.

At this time, the gas flow rate in the riser and the flow rate of the gas injected through the vertical portion and the horizontal portion was as shown in Table 3.

Gas injection positions in the prior art and the invention is shown in Table 4 below.

As described above, the pressure variation signal due to the flow of the ore particles in the riser during the injection of the ore particles was investigated. The results of the conventional example are shown in FIG. 4, and the results of the invention example are shown in FIG. 5.

   ore   Hammersley (Australian)  Particle size distribution   2 mm or less  Apparent density 4500 kg / m ³

   Riser    Inner diameter: 0.078 m, height: 6.0 m    Roof Room-Vertical Tube    Inner diameter: 0.050 m, height: 1.0 m    Roof Room-Horizontal Tube    140 x 60 mm

 Gas velocity in the riser [m / s]    10-22.5  Flow rate injected into the horizontal pipe [m3 / hr]    6.0-10.0  Flow rate injected into the vertical pipe [m3 / hr]    2.0-6.0

division Gas injection position in the horizontal part Gas injection position of vertical part Conventional example 34mm from the outside of the wear and 100mm from the outside of the wear 125 mm from the bottom of the horizontal section Inventive Example 34mm from the outside of the wear 30mm from the bottom of the horizontal section

As shown in FIG. 4, in the conventional example of injecting gas according to the conventional method, the width of the pressure drop signal change is very large. This is because the flow of the ore injected is very unstable (Fig. 4 (a)).

In addition, in some conditions, the ore was initially injected only, and after about 3 minutes, the ore hardly flowed into the riser due to the formation of large bubbles or slugs in the vertical pipe (FIG. 4 (b)).

However, in the case of the invention injecting gas according to the present invention, as shown in Figure 5, it can be seen that the width of the pressure drop signal change is very small, therefore, in the case of the present invention it is possible to inject a stable solid Able to know.

In addition, by adjusting the amount of gas in the vertical tube was able to adjust the amount of solid injected into the riser from about 0.1 kg / s to 1.0 kg / s.

The present invention has the effect of stably injecting a solid into the reactor (rising pipe) by properly changing the air injection position when injecting ore particles into the rising pipe through the U-shaped conduit consisting of a horizontal portion and a vertical portion will be.

Claims (1)

In the method of injecting the ore particles into the riser through a U-shaped conduit comprising a vertical portion in which the ore particles are introduced, a weir portion in which the ore particles are discharged, and a horizontal portion connecting the vertical portion and the wear portion in an ore particle communication relationship. In When the ore particles are injected into the riser via the vertical portion 21, the horizontal portion 22, and the wear portion 24 of the U-shaped conduit, the horizontal portion 22 is formed at the outer portion 24a of the wear portion 24. Gas is injected through the horizontal injection portion 25 provided at the bottom portion 22a of the horizontal portion up to the center, and is provided at the outer portion 21a of the vertical portion between the bottom portion 22a and the upper portion 22b of the horizontal portion. Ore particle injection method, characterized in that the gas is injected through the vertical injection portion 23

Images