JPS589689B2 - Catalyst packed bed - Google Patents

Description

Detailed Description of the Invention The present invention provides a support structure for a catalyst packed bed in a denitrification device that uses a built-in catalyst to remove NOx (nitrogen oxides) from combustion exhaust gas generated in various combustion devices, such as boiler combustion devices. Regarding the improvement of

Generally, the supporting member of the catalyst packed bed of this type of denitrification device has the problem that dust in the exhaust gas from the combustion device adheres to it, reducing the denitrification efficiency and increasing the pressure loss of the exhaust gas.

In addition, there are problems in that the supporting member deteriorates due to changes over time, and it becomes unable to withstand thermal expansion due to high catalytic reaction temperatures (350°C to 400°C), leading to damage to the supporting member. The reality is that a support structure for a catalyst packed bed that can address these problems has not yet been developed.

The present inventor has proposed a support structure for a catalyst packed bed that can solve the above-mentioned conventional problems. A holding frame 7 having a plurality of partition sections 8 and 9 with two opposing sides open in the packed bed.
In each of the partition sections 8 and 9 of the holding frame 7, there are two wire mesh panels or perforated plates 1 each with a catalyst sandwiched therebetween.
2, a reinforcing grating 13 superimposed on the outside of the wire mesh panel or perforated plate 12, and the reinforcing grating 13.
and a stopper 16 for holding the catalyst on the holding frame 7.

The present invention will be specifically described below with reference to the accompanying drawings.

1 and 2, 1 is a combustion exhaust gas inlet duct, 2 is a reactor inlet duct, 3 is a reactor main body, 4 is a catalyst layer, 5 is a reactor outlet duct, 6 is an exhaust gas outlet duct,
These members form a denitrification device in which a plurality of catalyst layers 4 are arranged as shown in FIG.
Combustion exhaust gas discharged from a combustion device (not shown) enters the reactor body 3 via the reactor inlet duct 2, where NOx is removed by the catalyst in the catalyst layer 4, and then passes through the reactor outlet duct 5. The fact that the exhaust gas is discharged to the outside from the outlet duct 6 is almost the same as in conventional denitrification equipment, but the catalyst layer 4 in the present invention is different from the conventional one in that it has the following structure. The structure is completely different from that of the original.

That is, in FIG. 2, 7 is a rectangular catalyst layer partitioned into a plurality of equal compartments 10 by horizontal partition frames 8 and vertical partition frames 9 in parallel and equally spaced stages, and with two opposing sides open. In each compartment 10 of the holding frame 7, a single catalyst layer A. are installed respectively.

3 and 4, reference numeral 11 denotes a layered catalyst of uniform thickness, 12 wire mesh panels stacked on both sides of the layered catalyst 11 with these panels in between, and 13 each outer surface of the wire mesh panels 12. With the reinforcing grating superimposed on the A. is formed.

The wire mesh panel 12 of this single catalyst layer A has a mesh structure in which horizontal threads are removed or warp threads are removed, and its peripheral frame portions are protruded at appropriate locations on the holding frame 7 and partition frames 8 and 9, as shown in FIG. Wire mesh panel holding plate 14 (however, partition frame 8
, 9 (not shown) and the peripheral frame 13 of the reinforcing grating 13
a, and is fixed to the peripheral frame 13a of the reinforcing grating 13 with fixing bolts 15.

The single-sided reinforced grating 13 is formed of a peripheral frame 13a and a plurality of bone members 13b stretched at uniform intervals between opposing frames of the peripheral frame 13a.
In b, the wire mesh panel 12 is evenly reinforced.

Reference numeral 16 denotes a stopper for holding the single catalyst layer A- in the compartment 10, and the stopper 16 is provided with suitable fixing means on both sides of the holding frame 7 and the partition frames 8, 9 at appropriate positions on the compartment 10 side as shown in the figure. For example, multiple pieces are fixed together by welding.

17 is the opposing stopper 16 of these stoppers 16.
This reinforcing material 17 is a reinforcing material installed between the reinforcing gratings 13 and has the role of pressing any part on the outside of the reinforcing grating 13.

Then, the single catalyst layer A having the above structure is attached to each section 1 of the holding frame 7.
0, the catalyst layer 4 of the present invention is installed as described above.
The catalyst layer 4 is disposed within the reactor main body 3 of the gutter removal device as shown in FIG.

The catalyst layer of the present invention is configured as described above, and performs the function of removing NOx in the combustion exhaust gas discharged from a combustion device in the same manner as the conventional catalyst layer.According to the present invention, (1) Since the holding frame 7 is divided into a plurality of equal-sized sections 10 and each of the catalyst layers A is incorporated in each section 10, manufacturing is easy, design standardization is possible, and costs can be reduced. It is measured.

(2) Since the frame members 13b of the reinforcing grating 13 of each catalyst layer unit A are oriented vertically or horizontally, and the wire mesh panel 12 also has a mesh structure with no weft threads or warp threads, the ducts in the combustion exhaust gas will not adhere. Therefore, the pressure loss of the exhaust gas can be small, and there is no risk of deterioration in denitrification efficiency.

(3) Each catalyst layer alone A. The reinforcement grating 13
Since the wire mesh panels are mounted in each compartment 10 by the stoppers 16 and by bolts, replacement due to deterioration over time is easy.

(4) Each catalyst layer alone A. Since the wire mesh panel 12 has a bolted structure, the wire mesh panel 12 can prevent thermal expansion at high temperatures.
A wire mesh can absorb enough water.

(5) Since the catalyst 11 is sandwiched between the wire mesh panels 12 and reinforced with the reinforcing grating 13 having rib members 13b at uniform intervals, uniform reinforcement can be obtained and the structure can sufficiently withstand catalyst pressure. This improves durability.

The following practical effects can be mentioned.

In the above example, the wire mesh panels 12 are used on both sides of the catalyst 11, but these may be perforated plates.

[Brief explanation of the drawing]

The drawings are schematic illustrations of an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a front view of one section of the holding frame. FIG. 4 is a view taken along the line IV--IV in FIG. 3, and FIG. 5 is an enlarged view of section V in FIG. 4... Catalyst packed bed, 7... Holding frame, 8, 9... Partition frame, 10... Compartment, 11... Catalyst, 12... Wire mesh panel,
13... Reinforcement grating, 16... Stoppa.

Claims (1)

[Claims] 1 A holding frame 7 having a plurality of partition sections 8 and 9 with open two opposing sides in a flat catalyst packed bed with at least two opposing sides formed of metal panels or perforated plates.
and two wire mesh panels or perforated plates 1 each housed in each of the partition sections 8 and 9 of the holding frame 7 with the catalyst sandwiched therebetween.
2, a reinforcing grating 13 stacked on the outside of the same wire mesh panel or perforated plate 12, and the reinforcing grating 13
and a stopper 16 for holding the catalyst in the holding frame 7.