JPS5812052B2 - Packing scraping device for solid-gas contact equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for scraping contact powder and granular materials from a packed bed of contact powder and granular materials in a solid-gas contact device, and particularly to a device for scraping out contact powder and granular materials from a packed bed of contact powder and granular materials in a solid-gas contact device, and in particular to a solid-gas contact device in a dry flue gas denitrification device. The present invention relates to a device for scraping catalyst particles from a catalyst packed bed of the device.

A solid-gas contact reaction apparatus in which a gas containing dust or the like is passed through a catalyst packed bed to carry out a reaction is equipped with a scraping device for extracting particulate materials such as catalyst particles in order to prevent dust from adhering.

For example, taking as an example a dry flue gas denitration device for gas such as boiler combustion exhaust gas, this scraping device will be explained using FIG. 1, which is a schematic diagram of the vicinity of the catalyst packed bed.

The reactor casing 1 is filled with a catalyst 2 held on a ventilation plate 3 such as a wire mesh or perforated plate facing at a predetermined interval, and a plate-shaped catalyst packed bed is provided as a whole, and a line is installed perpendicularly to this catalyst packed bed. Combustion exhaust gas is sent from line 4, and clean exhaust gas is taken out from line 5.

A catalyst supply section 6 is provided at the upper end of this catalyst packed bed, and a discharge section 7 is provided at the lower end.The catalyst falling from the discharge section 7 is received by a pedestal 8; A rotary blade 9 is installed in parallel with the rotary blade 9, and by rotating this blade 9, the surface of the catalyst is scraped out.

However, in this method, the catalyst remains in a corner where the discharge part 7 and the pedestal 8 intersect and accumulates together with dust, clogging the discharge part 7 and obstructing the function of the rotary blades. Since the positional relationship between the two is constant, there is a drawback that it is not possible to adjust the exhaust amount of the catalyst or take sufficient measures to prevent damage to the catalyst.

The inventors of the present invention have conducted various studies in order to eliminate the above-mentioned drawbacks of the scraping device. As a result, the inventors have installed a part of the corner where the catalyst discharge part intersects with the pedestal as a resting place for powder particles such as catalyst so that the catalyst can flow smoothly. The present invention was achieved by discovering that a slope shape with corners is sufficient.

That is, the present invention comprises a powder packed bed which is perpendicular to the flow direction of the gas to be treated, a powder discharge section below the bed, a pedestal below the pedestal for receiving the powder, and a connection between the discharge section and the pedestal. In a solid-gas contact device that has rotating blades installed parallel to each other in the middle, the intersection between the discharge part and the pedestal has a slope shape corresponding to the angle of repose of the powder, and a slit-shaped opening is provided just before the rotating blade installation part. The present invention relates to a packed material scraping device for a solid-gas contact device, characterized in that it is provided with:

The apparatus of the present invention will be further explained with reference to FIG. 2, which shows the same parts as in FIG. 1, and FIG. 3, which is an enlarged view of the part surrounded by dotted lines in FIG.

A reactor casing 01 is filled with a catalyst 02 held by ventilation plates 03 such as wire mesh or perforated plates facing each other at a predetermined interval, and a catalyst packed bed having an overall flat plate shape is attached.

A catalyst supply section 06 is provided at the top of this catalyst packed bed, and a discharge section 07 is provided at the bottom.

A pedestal 08 is attached below the till protrusion 07, and a rotating blade 09 is installed in parallel above the pedestal 08.

The discharge section 07 is composed of a discharge guide plate 010 reinforced with an upper reinforcing channel 017, a closing plate 011, and a guide plate 012 for guiding the catalyst. opening 020
The rotary blade 09 is arranged to face the opening 020.

Further, an opening area adjustment plate 013 for the opening 020 is provided at the tip of the guide plate 012, and the adjustment plate positioning bolt 01
The installation is fixed in step 4.

The discharge guide plate 010 and the guide plate 012, which are the intersection of the discharge part 07 and the pedestal 08, have a slope of the angle of repose, and this angle of repose varies depending on the powder or granule material, but the angle of repose is 3.
0° to 60° (catalyst containing dust).

It is preferable to attach an inspection manhole 016 to the center of the closing plate 011.

The pedestal 08 is connected to the discharge guide plate 010, and connected to the closing plate 011 and the pedestal 08 to form the lower chute 01 of the scraping device.
5 is provided and reinforced with a lower chute reinforcement channel 018.

The catalyst 02 is supplied and filled into the layer formed by the ventilation plate 03 from the catalyst supply section 06 .

The gas to be treated is introduced from 04 perpendicular to the catalyst packed bed, brought into contact with the catalyst 02 in the packed bed, and reacted, after which the reacted gas is taken out from line 05.

When this gas passes through, the catalyst is moved to prevent dust from adhering to the ventilation plate 03, increasing pressure loss and reducing reaction efficiency.

When the rotating blade 09 attached at the bottom is rotated to scrape out the surface of the catalyst 02, the catalyst will move to the discharge guide plate 0 as shown by the arrow.
10 and guide plate 012, passes through the opening 020 over the pedestal 08, and exits from the lower chute 015.

In the present invention, the discharge guide plate 010, which is the intersection between the discharge section 07 and the pedestal 08, has a slope of the angle of repose, so that the catalyst is smoothly discharged without accumulating and remaining at the intersection.

Furthermore, an opening area adjustment plate 013 at the tip of the guide plate 012
By adjusting the positioning bolt 014, the opening area of the opening 020 can be freely adjusted and the amount of catalyst discharge can be adjusted.
It is also possible to inject hot air or the like along 2) to help flow the catalyst particles.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram for explaining the structure near the conventional catalyst packed bed, and FIG. 2 is a schematic diagram for explaining the structure near the catalyst packed bed in the apparatus of the present invention corresponding to FIG.
FIG. 3 is an enlarged view of the portion surrounded by the dotted line in FIG. 2.

Claims (1)

[Claims] 1. A powder packed bed almost perpendicular to the flow direction of the gas to be treated, a powder discharge section below it, a pedestal for receiving the powder and granule below it, and a bed parallel to the middle between the discharge section and the pedestal. In the solid-gas contact device having a rotary vane installed, the intersection of the discharge part and the pedestal has a slope shape corresponding to the angle of repose of the powder, and a slit-shaped opening is provided immediately before the rotary vane installation part. A packed material scraping device for a solid-gas contact device featuring features.