JPS6229089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a catalytic reaction device, and more particularly to the structure of a device for preventing short-circuit flow of reaction gas when a catalyst unit is assembled.

Recently, large-sized catalytic reaction devices have been used as exhaust gas denitrification devices in thermal power plants. In this case, it is desired to make dust removal, replacement, assembly, etc. of the catalyst easy and efficient. Along with this, in order to achieve high denitration efficiency with low resistance to gas flow and to meet the above requirements, a plate-shaped catalyst is housed in a single box frame with gaps, forming a catalyst unit, and installed in the reaction gas passage. It has a structure. FIG. 1 shows a catalyst unit 1 in a perspective view with a portion of the plate-shaped catalyst 1a taken out. In the catalyst unit, a plate-shaped catalyst 1a is housed in a box-shaped frame 1b with its surface parallel to the gas flow. Note that the catalyst housed in the catalyst unit in the present invention is not limited to a plate-shaped catalyst, but may be other cylindrical or granular catalysts. The inventors have adopted an integrated catalyst unit structure in which a plurality of catalyst units are housed within a box frame to facilitate assembly and replacement in a large-scale reaction gas processing apparatus. However, in this case, the reaction gas flows into the gap between the side walls of the catalyst unit frame and the passage between the catalyst unit and the side wall of the reactor, resulting in a so-called gas short-circuit flow, and dust accumulates on the upper surface of the cross beam, causing the reaction gas to This results in problems such as a reduction in processing efficiency and the possibility of failure due to the accumulation of dust from the cross beams to the bottom surface of the integrated catalyst unit due to the blockage of the gas passages.

It is an object of the present invention to prevent the occurrence of such problems and to propose a structure of a catalytic reaction device that is free from reaction gas leakage and short circuits and free from dust accumulation on the upper surface of the cross beam.

In short, this invention provides a fixed seal plate on one side of the bottom surface of the integrated catalyst unit, and by assembling the fixed seal plate, short-circuit flow of gas between the integrated catalyst units is prevented. The catalytic reaction device is characterized by having a structure in which a joint plate is provided to prevent short-circuit flow of gas, and a dust accumulation prevention member is provided on the upper surface of the cross beam.

The structure of the device according to the present invention will be explained below with reference to the drawings. As shown in FIG. 3, the catalytic reaction device 3 has an inlet duct 3a for the reaction gas attached to the upper end thereof, and the reaction gas flows downward and is discharged from the outlet duct 3b. In the catalytic reaction device 3, integrated catalyst units 2 are installed in multiple stages, two stages in the drawing.
Furthermore, a small integrated catalyst unit 2' may be placed on the uppermost stage. Such an integrated catalyst unit does not occupy any wasted space when assembled. However, each integrated catalyst unit weighs approximately 600 kg, and its handling and assembly requires labor and special consideration for safety.

FIG. 4 schematically shows the assembly process using the assembly trolley proposed earlier by the inventors. The integrated catalyst unit 2 is placed on an assembly trolley 4 and is carried into position by the force of a wire 6 connected to a winch 5. Lowering at a fixed position may be done by a hydraulic device 4' or by a manual hoist 8 assembled to the ceiling rail 7. In this case, as mentioned above, if the seal plate 9 is attached to one side of the bottom surface of the integrated catalyst unit as shown in FIG. 2 and FIG. The reactor gas is sealed to prevent short-circuit flow of the reactant gas. Incidentally, a plurality of rectifying bars 2b are provided on the upper end surface side of the frame 2a of the integrated catalyst unit 2, which also serves as reinforcement.

FIG. 5 is a sectional view taken along the line DD in FIG. 3, and this drawing shows that when the integrated catalyst unit is assembled, it can be seen that due to the presence of the column 10 of the catalytic reaction device, a considerable gap f will be created between the pillar 10 and the wall surface 11. I understand. Therefore, when assembling the integrated catalyst unit 2, it is necessary to automatically attach a wall seal plate 12 to the wall surface 11 to prevent the reaction gas from flowing through the gap f. FIG. 8 is a partial sectional view showing the integrated catalyst unit 2 assembled on the wall side. The stopper 13 is used for determining the stop position of the cart and is attached to the wall surface 11. In this case, in order to prevent dust from accumulating in the gap f and to block gas, a bridge plate 14 is provided to bridge the surface between the upper end of the integrated catalyst unit 2 and the wall 11, as shown in FIG.

The cross beam 15 of the catalytic reaction device 3 located close to the bottom of the integrated catalyst unit 2 is generally an I-shaped member with a flat top surface, so that dust contained in the reaction gas can cross-link with the bottom of the integrated catalyst unit. Therefore, depending on the conditions, there is an opportunity to increase based on this. Therefore, as shown in FIG. 10, a folded member that forms a slope with a base angle larger than the angle of repose of the dust, that is, a longitudinal member having a mountain-shaped cross section, is attached to the upper surface of the I-shaped member to prevent dust accumulation 16.
This contributes to continuous operation of the device without dust accumulation.

By implementing this invention, there will be no leakage due to gas short-circuit flow, the efficiency of removing harmful components contained in gas will be increased, and continuous operation of the device will be possible without causing bridging accidents due to dust accumulation. The catalyst unit can be easily replaced, and various other effects can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a catalyst unit, FIG. 2 is a perspective view of an integrated catalyst unit, FIG. 3 is a partially cutaway side view of a catalytic reaction apparatus according to the present invention, and FIG. 4 is an integrated catalyst unit using a truck. A partial side view of the device to explain the assembly work, FIG. 5 is taken from D-D in FIG. 3.
6 is a sectional view taken along the line EE in FIG. 5, FIG. 7 is a cross-sectional view showing the relationship between the seal plate 9 and the integrated catalyst unit, and FIG. 8 is a detailed view of part A in FIG. 3.
FIG. 9 is a detailed view of section B, and FIG. 10 is a detailed view of section C. DESCRIPTION OF SYMBOLS 1...Catalyst unit, 2...Integrated catalyst unit, 2a...Frame, 3...Catalytic reaction device, 4...Dolly, 5...Winch, 7...Ceiling rail, 8...
Manual hoist, 9... Seal plate, 10...
Column, 11... Wall surface, 12... Wall seal plate, 13... Stopper, 14... Bridge plate, 15... Cross beam, 16... Dust accumulation prevention member.

Claims (1)

[Claims] 1. In a reactor in which a plurality of integrated catalyst units each containing a plurality of catalyst units containing catalyst members housed in a box frame are assembled in its gas passage, the gap between adjacent integrated catalyst units A seal plate provided on one side of the bottom of the integrated catalyst unit is used to seal the integrated catalyst unit, and a wall seal plate extending from the reactor wall is used to seal the gap between the side surface of the integrated catalyst unit and the reactor wall. A catalytic reaction apparatus characterized in that bridge plates that bridge sides and walls prevent short-circuit flows of processing gases, and dust accumulation prevention members are provided on the upper surfaces of beams of the reactor to prevent dust accumulation.