JPH11114339A - Ceramic filter device for treatment of exhaust gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent decrease in sealing property between filter elements and an outer frame in a filter device comprising laminated ceramic filter elements by disposing spacers between the laminated layers of filter elements so support the laminated filter elements. SOLUTION: The filter device 10 consists of a plurality of filter elements 11 stacked into a plural number of layers and arranged in a plural number of lines which are supported and integrated by an outer frame 12 and a pressing plate 13. In this device, the filter elements 11 each with a metallic spacer 14 and a pair of sealing members 15 are stacked to form four stages and arranged into five lines parallel to each other. The elements are inserted in the outer frame and supported in the vertical and horizontal directions. Namely, the sealing member 15 is interposed between the filter elements 11 parallel to each other and the filter elements 11 stacked are supported with the spacer 14. Thereby, the sealing member 15 is prevented from compression over a setting value, and decrease in the sealing property between the filter element 11 and the outer frame 12 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a ceramic filter device for treating exhaust gas.

[0002]

2. Description of the Related Art In an exhaust gas treatment apparatus that captures dust in exhaust gas discharged from various vehicles, ships, industrial equipment, combustion furnaces and the like and discharges the exhaust gas as clean gas, one end is plugged and the other end is open. A filter device having, as main components, a prismatic ceramic filter element having a large number of internal holes and a large number of internal holes which are sealed at the other end and open at one end.

[0003] In this case, in order to enhance the exhaust gas treatment capacity, a plurality of filter elements are stacked and supported by a metal outer frame from the outside in a state of being laminated, and the filter elements are horizontally placed in a casing constituting an exhaust gas treatment apparatus. It is used by being arranged in a state. In this case, one of both inner holes of each filter element constitutes an inlet for the gas to be treated, and the other constitutes an outlet for the treated gas.

In such a ceramic filter device, the gas to be treated leaks to the treated gas (clean gas) side between the filter elements and between each filter element and the outer frame, and the clean gas flows to the gas side to be treated. In order to prevent leakage, a seal member is interposed between each filter element and between each filter element and the outer frame.

[0005]

By the way, in the filter device, since each sealing member interposed between each filter element gradually reduces its elastic force, it is compressed by the load of the filter element to reduce its thickness. This is greatly reduced, and a gap is generated between the uppermost filter element and the frame. For this reason, the sealing property between the filter element and the frame is impaired. Accordingly, it is an object of the present invention to address such a problem.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a ceramic filter device for treating exhaust gas, and more particularly to a large number of inner holes which are plugged at one end and open at the other end and plugged at the other end. A prismatic ceramic filter element having a large number of open inner holes is supported and integrated by a metal outer frame from the outside in a state of being stacked via a seal member, and is arranged in a horizontal state. Further, the present invention relates to a ceramic filter device for treating exhaust gas, wherein one of the inner holes of each of the filter elements constitutes an inlet for a gas to be treated and the other constitutes an outlet for a treated gas.

According to the present invention, there is provided a filter device of the type described above, wherein a spacer for receiving the laminated filter element is interposed between the laminations of the filter elements. The spacer is preferably made of metal.

[0008]

In the filter device constructed as described above, since each of the laminated filter elements is received by the spacer interposed between the filter elements, the filter elements are interposed between the filter elements. The seal member does not receive a load equal to or more than a certain value defined by the thickness relationship with the spacer from each filter element, and the seal member between each filter element does not reduce the thickness more than set. .

Therefore, according to the filter device, each seal member interposed between the filter elements is compressed more than the set value, the thickness is greatly reduced, and a large gap is generated between the uppermost filter element and the outer frame. The sealing performance between the filter element and the frame body is prevented from deteriorating, and the gas to be treated leaks to the clean gas side from between each filter element, between each filter element and the outer frame, and the clean gas is removed. Leakage to the gas to be treated is prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show a ceramic filter device 10 according to an embodiment of the present invention.
In the filter device 10, a plurality of quadrangular prism-shaped filter elements 11 stacked in a plurality of layers and arranged in parallel are supported and integrated by an outer frame 12 and a pressing plate 13. The filter element 11 has a rectangular columnar shape and a honeycomb structure having a large number of inner holes arranged in parallel with each other. As shown in FIG. 3, each inner hole is open at the upstream end and plugged at the downstream end. A first inner hole 11a,
There are two types of second inner holes 11b whose upstream end is plugged and whose downstream end is open.

[0011] As shown in FIG.
Each of the compartments divided into a plurality of stages in the casing 21 constituting the exhaust gas treatment device 20 is used while being stacked in a plurality of stages and arranged in a state of being arranged in a plurality of rows on the left and right.

In the exhaust gas device 20, the casing 2
The support members 22 are vertically arranged in a plurality of stages within 1 to form each compartment, and the aggregate of the filter device 10 is arranged on each support member 22. In the casing 21, a supply hole 21a for the gas to be treated is formed at the top, a discharge hole 21b for the treated gas is formed at the lower side, and a drop hole 21c for dust is formed at the bottom. Are formed.

In the casing 21, the outer peripheral side is formed as an inflow passage r1 for the gas to be treated, and the central portion is formed as an outflow passage r2 for the treated gas. In each filter device 10, the upstream end of the filter element 11 is located on the inflow passage r1 side, and the downstream end thereof is located on the outflow passage r2 side. The hole and the second inner hole 11b are formed as an outlet for the treated gas.

The filter element 11 constituting the filter device 10 is a metal plate-like spacer 1.
4. It is stacked in four layers via a pair of sheet-shaped sealing members 15 and inserted into the outer frame 12 in a state of being arranged in five rows, and is supported in the vertical and horizontal directions.
A seal member similar to the seal member 14 is interposed between the parallel filter elements 11.

The filter device 10 is composed of a total of 20 filter elements 11, and each laminated filter element 11 is provided with an interposed spacer 1
4 has been accepted.

An exhaust gas treatment device 20 using the filter device 10 configured as described above treats exhaust gas containing dust 2 generated from various factories and the like as a gas to be treated. The gas to be treated supplied at a predetermined pressure reaches the upstream end of each filter element 11 of the filter device 10 and is introduced into a number of first inner holes 11a opened at the upstream end.
The gas to be treated introduced into each first inner hole 11a passes through each partition and flows out to each second inner hole 11b. During this time, dust in the gas to be treated is captured and adhered to each partition surface, The gas to be treated is purified and treated as a treated gas in each second inner hole 11b.
Is discharged to the outside through the discharge hole 21b from the opening at the downstream end.

In the exhaust gas treatment apparatus 20, high-pressure cleaning gas is ejected from the ejection pipe 23 of the backwashing mechanism to the downstream side of the filter device 10 by controlling the opening and closing of the solenoid valve during the treatment of the gas to be treated. . Thereby, the second inner hole 11
b, and the pressure difference between the inside of the first inner hole 11a is increased, and the dust trapped and adhered to each partition wall surface is released.
The detached dust falls into a storage chamber (not shown) through the drop hole 21c.

By the way, in the filter device 10, the stacked filter elements 11 are received by the spacers 14 interposed between the filter elements 11, so that the filter elements 11 are interposed between the filter elements 11. The sealing member 15 does not receive a load equal to or more than a predetermined value defined by the thickness relationship with the spacer 14 from each filter element 11, and each filter element 11
The thickness of the seal member 15 in between does not decrease more than the set value.

Therefore, according to the filter device 10,
Each seal member 1 interposed between each filter element 11
5 is compressed more than the set value to greatly reduce the thickness, and no large gap is generated between the uppermost filter element 11 and the outer frame 12.
The sealing performance between the outer frame 12 and the outer frame 12 is prevented from being reduced.
Leakage of the gas to be treated from the space between the two to the clean gas side and leakage of the clean gas to the gas to be treated side are prevented.

[Brief description of the drawings]

FIG. 1 is a front view of a filter device according to an example of the present invention.

FIG. 2 is a longitudinal sectional view of the filter device taken along a line 2-2 of FIG. 1;

FIG. 3 is a partial plan view (a) on the upstream side and a partial plan view (b) on the downstream side of a filter element constituting the filter device.

FIG. 4 is a schematic vertical sectional side view of an exhaust gas treatment apparatus using the filter device.

[Explanation of symbols]

10 ... Filter device, 11 ... Filter element, 11
a, 11b: inner hole, 12: outer frame, 13: push plate, 14: spacer, 15: seal member, 20: exhaust gas treatment device, 2
DESCRIPTION OF SYMBOLS 1 ... Casing, 21a ... Supply hole, 21b ... Discharge hole, 2
1c: falling hole, 22: support member, 23: ejection pipe, r1 ...
Inflow passage, r2 ... outflow passage.

Claims (2)

[Claims] 1. A prismatic ceramic filter element having a number of inner holes which are plugged at one end and open at the other end and a number of inner holes which are plugged at the other end and open at one end forms a sealing member. Are supported and integrated from the outside by a metal outer frame in a stacked state, and are disposed in a horizontal state so that one of the inner holes of each of the filter elements has an inflow hole for the gas to be treated. In the ceramic filter device for exhaust gas treatment, the other of which constitutes a treated gas outflow hole, a spacer for receiving the laminated filter element is interposed between the respective filter elements. A ceramic filter device for treating exhaust gas. 2. The ceramic filter device according to claim 1, wherein said spacer is made of metal.