JP2002239345A - Device for treating exhaust gas pallet filled with having honeycomb catalyst - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for treating exhaust gas having pallet filled with a honeycomb catalyst where a pressure loss is low when the exhaust gas passing through the device, where the gas to be treated is uniformly and efficiently distributed into catalyst layers without being directly passed through or short-circuited, where the reaction ratio is high, and where filling up a reactor with the catalyst and replacement of the deteriorated catalyst are greatly facilitated, in a fixed-type device for treating exhaust gas so as to treat harmful gas components. SOLUTION: This device for treating exhaust gas comprises a structure comprising a catalyst pallet group composed of a plurality of pallet unit layers each formed by horizontally arranging a plurality of pallets 103 formed by stacking honeycomb- shaped catalyst elements 101 in matrix shapes and housing them in a case having a through-hole in the upper and lower directions and a housing 6 for the pallet group composed of the pallet unit layers 104 multiply arranged in vertical direction with spaces there between. The structure body containing the housing for the housing 106 of the pallet group for treating the exhaust gas is provided with a guide means for movably supporting the pallets and the pallets have slidable sliding parts and a guide means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust gas treatment apparatus containing a harmful gas component and having a honeycomb catalyst-filled pallet. More specifically, the present invention relates to a device for treating diesel engine exhaust gas, exhaust gas from various incinerators, firing furnaces, and reaction furnaces, which decomposes or oxidizes harmful gas components of exhaust gas with a catalyst to detoxify the exhaust gas.

[0002]

2. Description of the Related Art In order to protect human health and keep the environment of the earth favorable, it is an important and essential technology to reduce harmful substances discharged in industrial activities as much as possible. Therefore, by discharging the exhaust gas from diesel engines and the gases discharged from large-scale facilities such as incinerators, firing furnaces, and reaction furnaces through stationary catalyst reactors, harmful gas components are decomposed or oxidized and removed before discharge. Has been taken.

[0003] Such an exhaust gas treatment apparatus has a large amount of exhaust gas and requires an enormous catalyst area, so that the apparatus scale becomes large. Therefore, depending on the catalyst loading method or the loading structure, for example, even if a large pressure loss occurs, or even if the catalyst layer circulation path is large, the reaction rate is limited, and the gas to be treated is uniformly and effectively distributed. However, there has been a problem that an enormous amount of time and effort are required for loading the catalyst into the reactor and replacing the deteriorated catalyst.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is directed to a stationary exhaust gas treatment apparatus for treating harmful gas components, which has a low pressure loss through an exhaust gas treatment apparatus. The gas to be treated flows uniformly through the catalyst layer without short-circuiting and short-circuiting, and the reaction rate is higher than before even if the total catalyst layer flow length is the same. It is an object of the present invention to provide an exhaust gas treatment device having a honeycomb catalyst-filled pallet, which is extremely convenient for filling and replacing a deteriorated catalyst.

[0005]

An exhaust gas treatment apparatus having a honeycomb catalyst-filled pallet according to the present invention is divided into a plurality of partitions parallel to a gas flow direction to form a plurality of cells having a polygonal cross section and being long in the gas flow direction. A honeycomb-shaped catalyst element having a matrix is stacked in a matrix, and a plurality of pallets housed in a vertically penetrated case are arranged in a horizontal direction to form a pallet unit layer. Exhaust gas treatment having a multilayered arrangement of exhaust gas treatment catalyst pallets and an inlet / outlet through which the gas to be treated flows in a vertical direction and through which the treated gas can flow out through each honeycomb type catalyst element of the exhaust gas treatment catalyst pallets. An exhaust gas treatment device comprising a structure including a housing for a group of catalyst pallets, the housing comprising a group of catalyst pallets for exhaust gas treatment. And a guide means for movably supporting the pallet, the pallet having a sled provided on the left and right sides of the pallet slidable with the guide means, and further abutting the housing and the edge thereof. A pallet provided before and after the pallet.

[0006] The catalyst packed structure of the catalyst packed tower type reactor is, for example, packed with a pellet or granular catalyst at an appropriate density, the catalyst itself is formed as a block having an open-cell porous structure, or a fibrous or woven fabric. Although the cloth-like catalyst is packed at an appropriate density, if the device has a high gas flow rate or if the catalyst expands or swells due to the reactants on the catalyst surface, the packing with high pressure loss It is not preferable because it becomes a tower, so the surface component perpendicular to the gas flow direction, which is resistant to gas flow, is reduced as much as possible, and it is divided by a plurality of partition walls parallel to the gas flow direction. Therefore, it is preferable to use a honeycomb catalyst element having a plurality of cells having a polygonal cross section and being long in the gas flow direction.

FIG. 2 illustrates an example of the honeycomb catalyst element. The prism-shaped catalyst element 101 and the partition 201 are made of a material having a catalytic function.
In the example shown in the figure, a plurality of cells 202 are formed by a large number of vertical partition walls orthogonal to each other. The gas to be treated reacts with the catalyst on the cell wall while passing through the element in the vertical direction.

In addition, as a packing structure, if the unit elements are integrated in a matrix form and once stored in a case as a catalyst unit and handled as a module, it is easy to assemble and repair the apparatus. FIG. 1 (B) illustrates this, in which the catalyst elements 101 are integrated in a matrix and sealed between adjacent elements with a heat-resistant packing (not shown) so that the gas to be treated escapes between the elements. The catalyst unit 102 is formed so as not to be short-circuited. The catalyst unit 102 is accommodated in a vertically penetrated case (not shown in the figure) to form a pallet 103.

FIG. 3 shows an example in which the case is placed in a vertically penetrated case.
(A) and (B) show. In FIG. 3A, the side plate is made of a heat-resistant plate (usually a metal plate), and the bottom is provided with catalyst element support means 301. As shown in FIGS. 3 (A) and 3 (B), the center of the element 101 is placed at the intersection of the supporting means, and the adjacent elements are sealed with a heat-resistant packing 302 so that the gas to be processed does not come off between the elements. .

FIG. 1A illustrates the entire apparatus of the present invention. A plurality of the pallets 103 are arranged in a horizontal direction to form a pallet unit layer 104, and the unit layers are arranged in a multilayer structure in a vertical direction to form an exhaust gas. The processing pallet group 105 is used.
The exhaust gas treatment pallet group 105 is surrounded by a housing 106 of a housing structure that covers the exhaust gas treatment pallet and allows exhaust gas to be introduced only into the exhaust gas treatment pallet group.
08. The housing structure includes, in addition to the cover plate of the housing, a structure (not shown) that supports the cover plate and forms a framework that supports the exhaust gas treatment pallet group.

On the other hand, FIG. 5 shows an example in which the structure including the housing includes guide means for movably supporting the pallet, and the pallet has the guide means and a slidable sled portion. . That is, in FIG.
06 or the guide means 401 in the housing structure.
Each of the plurality (three) of the pallets 103 includes the guide means and a slidable sled portion 402. As a result, a heavy pallet can be easily taken in and out of the apparatus in units of pallets, so that time and labor are not required for assembly and maintenance.

Further, in the exhaust gas treatment apparatus having a honeycomb catalyst-filled pallet of the present invention, the sled portion has a gas sealing function at a sliding portion in contact with the guide means, and the flange portion abuts the edge thereof. It is characterized by having a gas sealing function with the seal part of the housing.

To explain this with reference to the example of FIG. 7, in order to prevent the gas passing through the housing 106 from passing through the catalyst layer inside the pallet, and coming off the cylinder between the pallets 103 and short-circuiting, the guide means 401 and the sled are used. The contact sliding portion with the portion 402 needs to be airtight. As a result, the airtightness of the left and right pallets is maintained. Means for achieving this is not particularly limited, but does not necessarily require the interposition of heat-resistant packing, and can be achieved by making the finishing accuracy of the metal touch of the contact sliding portion appropriate. The security of the pallet before and after the pallet will be described with reference to FIGS. 5 and 6.
1, 404-2 are replaced with seal portions 410, 409 of the housing.
Can be achieved by contacting the

FIG. 4 is a detailed example of the pallet,
The pallet 103 includes a case measuring plate 406 and a case front plate 40.
4 and the case rear plate 405 are bolted 406 respectively.
The case 303 is constituted by the catalyst element supporting means attached to the bottom part (not shown). The case 303 is filled with a plurality of catalyst elements 101 in a matrix, and the adjacent catalyst elements are sealed with a heat-resistant packing 302 or the like. The bottom is provided with a pallet sled portion 402, which is in contact with guide means 401 attached to the housing structure and is movably supported.

FIG. 5 is an example of an assembly view of the pallet shown in FIG. The frame including the sled portion 402 and the front and rear flange portions 404-1 and 405-1 shown in FIG. 5B from the lower surface of the above-described case 303 shown in FIG. When completed, it is fitted into the guide means 401 provided in the housing structure.

FIG. 6 is a cross-sectional side view of an example in which a pallet is installed in a housing structure, and illustrates a sealing state of front and rear surfaces of the pallet. The pallet front flange 404-1 abuts on the heat insulator / seal portion of the pallet take-out door provided on the housing 106, and the pallet rear flange 405-1 abuts on the seal portion 410 provided on the housing 106, thereby completing the seal. are doing. As a result, the left, right, front and rear of the gas flow are sealed, and all the flows pass through the catalyst layer.

Further, in the exhaust gas treatment apparatus having the honeycomb catalyst-filled pallet of the present invention, the honeycomb-shaped catalyst elements integrated on the pallet are divided into a plurality of pieces in the longitudinal direction to form a catalyst unit, and the catalyst units have a predetermined interval. And arranged vertically.

Considering the process in which the harmful gas component passes through the catalyst cell and reacts with the catalyst wall parallel to the passage direction, the apparent reaction speed is not only the reaction speed involving the essential catalyst but also the catalyst wall. The rate of mass transfer of harmful components and other substances in the vertical direction,
In other words, it depends on the diffusion speed. Since this diffusion rate is not constant but fluctuates depending on conditions, there is a boundary film with a virtual thickness, and if it does not pass through the boundary film, it will not reach the reaction point, and the thickness will change depending on the conditions. May be useful for engineering handling. In this type of catalytic reaction in the context of the present invention, the longer the distance the gas passes through the inside of the cell along the catalyst wall, the greater the film thickness (or film resistance) may increase. Have been discovered. In other words, the longer the distance the gas passes, the lower the apparent reaction rate, the lower the reaction rate per effective passage distance, and the lower the efficiency. Based on this principle, the present inventors filed an invention of a discontinuous honeycomb type catalyst in Japanese Patent Application No. 11-223906 by limiting the gas passage length parallel to the wall of the honeycomb catalyst. The present invention includes a more specific device structure of the unpublished prior application technology.

That is, as an intermittent method, for example, an apparatus having an extremely multi-stage structure can be used by setting the height in the dimensions of the pallet low (appropriate height).
On the contrary, both the structure and the handling are complicated. Therefore, in the present invention, a honeycomb-shaped catalyst element having a short longitudinal direction is integrated into a catalyst unit in a pallet, and the catalyst unit is vertically arranged with a certain interval so that the element is divided into a plurality of pieces in the pallet in a vertical direction. As a result, the gas passage length of each element, and thus the cell, is limited while the pallet is appropriately sized for handling.

More specifically, an exhaust gas treatment apparatus having a honeycomb catalyst-filled pallet according to the present invention is characterized in that the pallet has a plurality of catalyst units that can be stacked, in which the stacked honeycomb-type catalyst elements are housed in a vertically penetrated case. It has a catalyst element support means provided at the bottom of the catalyst unit for supporting the catalyst element, a spacer for keeping the interval between the catalyst units, and a guide fixing means for fixing and stacking the catalyst units in place. And

Further, the exhaust gas treating apparatus having the honeycomb catalyst-filled pallet of the present invention is characterized in that the spacer is formed by extending an upper portion of a vertical wall forming a case of the catalyst unit. That is, a part of the case wall can also serve as the spacer.

Further, the exhaust gas treatment apparatus having the honeycomb catalyst-filled pallet according to the present invention is characterized in that the spacer has a variable stopper for variably setting the interval between the catalyst units. Thereby, the interval can be freely changed and set to the optimum condition.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the description of the above-mentioned means for solving the problem, the present invention has been described by way of example. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
However, the dimensions and materials of the components described in the present embodiment,
Unless otherwise specified, the shape, its relative arrangement, etc.
It is not intended to limit the scope of the present invention only to this, but merely as an illustrative example.

(Embodiment 1) FIGS. 8 and 9 are diagrams showing a first embodiment of the present invention. In FIG. 8, honeycomb-shaped catalyst elements 101 having a desired length are integrated and vertically penetrated,
By stacking a plurality of catalyst units 601 housed in a case 403 provided with a spacer 603 on the upper side in multiple stages to form one pallet, a module having catalyst elements vertically divided within one pallet can be obtained. it can. Each of the catalyst units 601 is stacked and fixed in multiple stages by guide fixing means 604. Further, the catalyst element 1
To collect and store 01, the bottom of the case is
What is necessary is just to use the catalyst support means shown to (A) and (B).
In FIG. 9A, the flat bar 702 has a required number of flat bars 702 in the lateral direction and both ends thereof are attached to the side plates of the left and right cases.
4, the bar 703 is welded in the front-rear direction to the required number of measurement plates at the welding points 704 shown in the figure, and the intersection of the flat bar and the bar is embedded in the flat bar as shown in the figure. I have.

FIG. 9B shows an example in which the catalyst supporting means is constituted by a simple mesh. The guide fixing means may have a structure 701 in addition to 604 in FIG. 9A.

(Embodiment 2) In addition to the method in which two opposite walls of the case are extended upward so as to maintain a space with the upper case, the catalyst spacing in this embodiment shown in FIG. If the spacer 801 is formed in such a manner that a plate material of a desired height is sandwiched between the plate member and the plate member 803 bolted to the position opposite to the guide fixing means 604, the bolt position and the height of the sandwiched plate material are changed. Thereby, the interval can be easily adjusted.

(Embodiment 3) As shown in FIG. 10B, a spacer 802 made of a single plate is not sandwiched as in the previous embodiment.
Can be bolted (803) to the guide fixing means 604 and adjusted by the hole position or plate height.

(Embodiment 4) Further, a spacer 901 in which bolt fastening is replaced by welding 9 as shown in FIG.

[0029]

As explained above, according to the present invention, in a stationary exhaust gas treatment apparatus for treating harmful gas components,
Low pressure loss in the exhaust gas passing through the processing unit, the flow of the gas to be treated can be uniformly and effectively carried out in the catalyst layer without short-circuiting and short-circuiting. This has made it possible to provide an exhaust gas treatment apparatus having a honeycomb catalyst-filled pallet, which has a high efficiency and is extremely convenient for charging a catalyst to a reactor and replacing a deteriorated catalyst.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an exhaust gas treatment device having a honeycomb catalyst-filled pallet.

FIG. 2 Schematic diagram of a catalyst element

FIG. 3 is a schematic diagram illustrating a case where a pallet is formed by storing a catalyst element in a case.

FIG. 4 is a schematic diagram illustrating a detailed structure of a pallet.

FIG. 5 is a schematic diagram illustrating the assembly of a pallet.

FIG. 6 is a cross-sectional side view of a pallet installed in a housing.

FIG. 7 is a front sectional view in which a pallet unit layer is installed in a housing.

FIG. 8 is a schematic diagram illustrating a case where the divided catalyst elements are stored in a case to form a pallet.

FIG. 9 is a schematic diagram illustrating catalyst supporting means of the case and the like.

FIG. 10 is a schematic diagram showing two examples of a variable stopper.

FIG. 11 is a schematic view showing another example of the variable stopper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Catalyst element 102 Catalyst unit 103 Pallet 104 Pallet unit layer 105 Exhaust gas treatment pallet group 106 Housing structure housing 107 Exhaust gas inlet 108 Processing gas outlet 109 Exhaust gas 201 Partition wall 202 Cell 301 Catalyst element support means 302 Packing 303 Case 401 Housing structure Guide means 402 Pallet sled portion 404 Case front plate 404-1 Pallet front flange 405 Case rear plate 405-1 Pallet rear flange 406 Case measurement plate 409 Insulating material and seal portion 410 Seal portion 411 Extraction port door 600 Gas flow 601 Vertical direction Catalyst unit 602 divided into two parts 603 Division interval 603 Spacer 604 Guide fixing means 701 Other examples of guide fixing means 702 Flat bar 703 Bar 704 Contact points 705 mesh 801 spacer 802 spacer 803 bolted 901 spacer

[Procedure amendment]

[Submission date] April 19, 2001 (2001.4.1
9)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

To explain this with reference to the example of FIG. 7, in order to prevent the gas passing through the housing 106 from passing through the catalyst layer inside the pallet, and coming off the cylinder between the pallets 103 and short-circuiting, the guide means 401 and the sled are used. The contact sliding portion with the portion 402 needs to be airtight. As a result, the airtightness of the left and right pallets is maintained. Means for achieving this is not particularly limited, but does not necessarily require the interposition of heat-resistant packing, and can be achieved by making the finishing accuracy of the metal touch of the contact sliding portion appropriate. The security of the pallet before and after the pallet will be described with reference to FIGS. 5 and 6.
1, the seal portion of the housing 405-1 410,409
Can be achieved by contacting the

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction contents]

(Embodiment 1) FIGS. 8 and 9 are diagrams showing a first embodiment of the present invention. In FIG. 8, honeycomb-shaped catalyst elements 101 having a desired length are integrated and vertically penetrated,
By constructing one pallet by stacking a plurality of catalyst units 601 housed in a case 303 provided with a spacer 603 at the top, a module having catalyst elements vertically divided within one pallet can be obtained. it can. Each of the catalyst units 601 is stacked and fixed in multiple stages by guide fixing means 604. Further, the catalyst element 1
To collect and store 01, for example,
What is necessary is just to use the catalyst support means shown in (A) and (B).
In FIG. 9 (A), the required number of flat bars 702 are set in the horizontal direction,
4, the bar 703 is welded to the required number of measurement plates in the front-rear direction at the welding point 704 shown in the drawing, and the intersection of the flat bar and the bar is embedded in the flat bar as shown in the figure. I have.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tetsuo Sato 12 Nishikicho, Naka-ku, Yokohama-shi F-term in Mitsubishi Heavy Industries, Ltd. Yokohama Works 3G091 AA18 AB01 BA07 BA38 BA39 GA06 GA12 GA13 GA16 GA21 GB01Z HA08 HA12 HA26 HA27 HA28 HA31 HA32 HA33 HA47 4D048 AB01 AB03 BB02 BB18 CA02 CA07 CA08 CB02 CC02 CC08 CC32 CC36 CC58 4G069 AA11 CA02 CA03 CA07 CA10 EA18 EE07

Claims (6)

[Claims] 1. A honeycomb-shaped catalyst element having a plurality of cells long in the gas flow direction is stacked in a matrix by being partitioned by a plurality of partition walls parallel to the gas flow direction, and housed in a case vertically penetrated. A plurality of pallets are arranged in the horizontal direction, a pallet unit layer is formed, and furthermore, the pallet unit layers are separated and vertically arranged in multiple layers,
An exhaust gas treatment catalyst pallet group, and an exhaust gas treatment catalyst pallet group having an entrance through which a gas to be treated flows in a vertical direction and through which the treated gas can flow out through each honeycomb type catalyst element of the exhaust gas treatment catalyst pallet group. An exhaust gas treatment device comprising a structure including a housing, wherein the structure including a housing of a group of exhaust gas treatment catalyst pallets is provided with guide means for movably supporting the pallet, and the pallet slides with the guide means. An exhaust gas treatment device having a honeycomb catalyst-filled pallet, comprising a sled portion provided on the left and right sides of the pallet, and a flange portion provided on the front and rear sides of the pallet which abuts the housing and the edge thereof. 2. A method according to claim 1, wherein said sled portion has a gas sealing function at a sliding portion in contact with said guide means, and said flange portion has a gas sealing function at a sealing portion of a housing in contact with an edge thereof. An exhaust gas treatment apparatus having the honeycomb catalyst-filled pallet according to claim 1. 3. A honeycomb catalyst element integrated on the pallet is divided into a plurality of pieces in a longitudinal direction to form a catalyst unit, and the catalyst units are arranged in a vertical direction with a certain interval. An exhaust gas treatment apparatus having the honeycomb catalyst-filled pallet according to claim 1 or 2. 4. A pallet comprising a plurality of stackable catalyst units, each of which includes a stacked honeycomb type catalyst element housed in a vertically penetrated case, and a catalyst element provided at the bottom of the catalyst unit for supporting the catalyst element. The honeycomb catalyst according to any one of claims 1 to 3, further comprising a support unit, a spacer for keeping a distance between the catalyst units, and a guide fixing unit for fixing and stacking the catalyst units in a fixed position. Exhaust gas treatment device with a filling pallet. 5. An exhaust gas treatment apparatus having a honeycomb catalyst-filled pallet according to claim 4, wherein said spacer is formed by extending an upper portion of a vertical wall forming a case of a catalyst unit. 6. The exhaust gas treatment device having a honeycomb catalyst-filled pallet according to claim 4, wherein the spacer has a variable stopper for variably setting a catalyst unit interval.