JPS6135271Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for separating dust from particulate matter containing dust.

In the presence of a catalyst, combustion exhaust gas containing nitrogen oxides is
It reacts with ammonia to render it harmless and is dissipated into the atmosphere, but during the cyclic use of the granular catalyst in the vertical catalyst transfer bed, dust entrained in the combustion exhaust gas adheres to the surface and its activity decreases. Otherwise, the catalyst itself becomes powder and its catalytic action gradually decreases.

In order to separate and remove dust not only from granular catalysts used in the treatment of combustion exhaust gases containing nitrogen oxides but also from fluid granules containing dust, the granules can be passed through a screen (sieve) with a mesh smaller than the particle size. ) and by physical means such as shaking the screen vertically or horizontally, the dust is separated into fine particle size dust that passes through the mesh of the screen and particulate matter that remains on the screen. However, when performing such a separation operation,
If the granular material is a granular material such as a catalyst used in the treatment of combustion exhaust gas containing nitrogen oxides, the strength of the granular catalyst is not so great that it can be molded by solidifying powder with a binder. There was a drawback that even the granular catalyst, which was destroyed by the shaking and could still be used, was powdered and lost in weight.

The present invention relates to a dust separator with a specific structure that eliminates the drawbacks of conventional dust separators as described above. This method efficiently separates dust and powdered materials that adhere to the surface of granular materials with relatively low strength.

That is, the present invention comprises a cylindrical inclined screen which is equipped with a spiral blade inside which moderates the flow of particulate matter including dust and is rotated by a shaft penetrating the screen at an inclined angle, and an inclined casing containing the same;
The casing includes a charging port for charging granular material containing dust into the inclined screen at one end, a reservoir portion for mitigating the impact of charging the granular material, and a dust outlet separated in the center. The gist of the invention is an apparatus for separating dust from particulate matter containing dust, characterized in that the other end is provided with an outlet for discharging the particulate matter from which the dust has been separated from the inclined screen.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An apparatus for separating dust from granular materials containing dust according to the present invention will be described below with reference to drawings showing one embodiment thereof.

In Fig. 1, 4 is an inclined screen 3 which will be described later.
This is a slanted casing with a built-in particulate matter inlet 5 with dust attached to its surface at one end, a particulate matter reservoir part 6, a dust outlet part 7 separated in the center of the bottom, and a dust outlet part 7 at the other end. A discharge port 8 for the separated particulate matter is provided. Also, inside the casing 4 is a shaft 1 on which a spiral blade 2 is attached.
A cylindrical inclined screen 3 having openings at both ends is built in and rotates while being supported by a support arm 1a. Further, the shaft 1 is supported by bearings 9, 9, and rotated by a sprocket wheel 10 driven by a drive device.
Note that the direction of rotation is counterclockwise when viewed from the sprocket wheel 10 side. Specific examples of the material for the inclined screen 3 include wire mesh, porous plate, wedge wire screen, etc., and these must have meshes or slits smaller than the particle size of the granules.

Reference numeral 11 denotes a brush for wiping the surface of the rotating inclined screen 3 to prevent clogging caused by separated dust and powdered substances, and is provided so as to press the surface of the inclined screen 3 against the coil spring 12. It is.

As shown in FIG. 1, the dust separator of the present invention opens the charging port 5 so that the granules move by their own weight from the charging port 5 at one end of the inclined casing 4 to the other end where the discharge port 8 is provided. It's expensive. That is, the particulate matter containing dust introduced from the charging port 5 first accumulates in the reservoir 6, forming a buffer zone.
Next, as the input continues, the granules fall into the buffer area, then slide into the rotating cylindrical inclined screen 3, and while moving to the discharge port 8 due to their own weight, they adhere to the surface of the granules. Only the dust falls from the mesh or slit, is separated and discharged to the dust outlet 7, and the particulate matter falls from the outlet 8. In this case, the flow of the granular material toward the discharge port 8 is relaxed by the spiral vane 2 attached to the shaft 1, and collisions between particles on the way are prevented to the maximum, thereby avoiding the granulation of the granular material itself. This is a major feature of the dust separation device of the present invention.

Figure 3 shows the case where the dust separator of the present invention is applied to equipment that processes combustion exhaust gas containing nitrogen oxides to separate dust accompanying the combustion exhaust gas adhering to the surface of a granular catalyst for reduction. FIG. 2 is a schematic diagram for an example.

In the figure, A is nitrogen oxide-containing combustion exhaust gas mixed with ammonia (reducing agent), which is introduced from the inlet pipe 13 in the direction of the arrow along with dust generated by combustion, and is passed through the ventilation side wall. It passes through the vertical moving bed 14 of the retained granular catalyst, is reduced, detoxified and dust removed, and becomes clean gas, which is discharged into the discharge pipes 15 and 1.
5.

That is, the upper part of the vertical moving bed 14 is connected to the granular catalyst supply hopper 16, and the lower part is in contact with the rotary leaf feeder 17, and the granular catalyst is fed vertically by replenishment from the catalyst supply hopper 16 and rotational discharge from the rotary leaf feeder 17. It moves downward in the mold movement layer 14, during which it comes into contact with combustion exhaust gas, and the dust in the gas adheres to the surface of the granular catalyst. The granular catalyst with dust attached to its surface enters the dust separator of the present invention through the charging port 5 of the dust separator of the present invention, which is connected to the lower hopper forming part 18 of the processing equipment, and is rotated by the shaft 1 into the cylindrical inclined shape shown in FIG. While moving through the screen 3 to the downstream discharge port 8, dust is discharged and separated from the dust discharge port 7, and the purified granular catalyst is taken out from the discharge port 8 and transferred to the moving conveyor 1.
9 to the catalyst supply hopper 16;
It is supplied to the vertical moving layer 14.

As described above, the apparatus for separating dust from granular materials according to the present invention includes a cylindrical inclined screen equipped with spiral blades and rotated by a shaft penetrating the inside, and this cylindrical inclined screen built-in, which also separates dust-containing granular materials. It consists of an inclined casing having a charging port for particles, a discharge port for separated dust, and a discharge port for purified granular materials, and the spiral casing prevents destruction due to collisions between particles during charging of granular materials and dust separation operations. Since the structure uses the buffering effect of the blades to block dust and powdered substances from being attached to the surface, even relatively weak particles can be efficiently separated without causing any damage to the particles themselves. It brings about great effects when applied to a means for cleaning fluid granular catalysts in oxide-containing combustion exhaust gas treatment equipment.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an example of the dust separation device of the present invention, Fig. 2 is a longitudinal sectional view taken along the line X-X of Fig. It is a cross-sectional schematic diagram to which a dust separation device of an example of the invention is applied. 1... Shaft, 2... Spiral blade, 3... Cylindrical inclined screen, 4... Inclined casing, 5
...Charging port, 6...Reservoir, 7...Dust discharge port, 8...Discharge port, 11...Brush, 12...Coil spring, 13...Introduction pipe, 14...Vertical moving bed, 15... ... Outlet pipe, 16 ... Catalyst supply hopper, 17 ... Rotary feeder, 19 ... Moving conveyor, 18 ... Lower hopper forming section.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical inclined screen that is internally equipped with a spiral vane to moderate the flow of particulate matter including dust and is rotated by a shaft penetrating the screen, and an inclined casing that houses the screen. A charging port for charging granular material containing dust into the inclined screen, a reservoir portion for mitigating the charging impact of the granular material, a dust outlet separated in the center, and the slanted screen at the other end. 1. A device for separating dust from particulate matter containing dust, comprising an outlet for discharging the particulate matter from which dust has been separated.