JPH05256121A - Gas treatment equipment - Google Patents

Abstract

PURPOSE:To obtain backwashing effect with a few backwashing gas by providing exhaust nozzles for backwashing gas in opposition to the downstream end side of filters and providing a restricting member to restrict the flow of backwashing gas backward. CONSTITUTION:A gas treatment equipment consists of a mainframe 10, a pair of gas filters 20a. 20b and a backwashing mechanism 30. The mainframe has a casing 11 formed with a gas exhaust port 11a, gas inflow ports 11c, lid and a dust discharge port 11b, and the gas filters 20a, 20b are ceramic honeycomb structures. The backwashing mechanism 30 has a backwashing gas supply pipe 31 with several exhaust nozzles arranged on the downstream side of respective filters and a gas restricting member 32 arranged on the downstream side of the supply pipe 31. In this way, backwashing gas is guided into a gas outflow port to obtain great backwashing effect with a few backwashing gas.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas treatment for treating exhaust gas emitted from engines of various vehicles, ships, industrial equipment, etc., such as diesel engine exhaust gas, and various gases emitted from various factories. Regarding the device.

[0002]

2. Description of the Related Art Dust containing various fine particles such as combustible fine particles and non-combustible fine particles is mixed in various kinds of exhaust gas, and when such exhaust gas is released to the atmosphere without any treatment, air pollution. Cause of. Therefore, various kinds of gas treatment methods and treatment apparatuses have been proposed and used conventionally. As disclosed in Japanese Patent Laid-Open No. 159408/1989 as a type of these gas treatment method and treatment apparatus, inside the casing having the gas inflow hole and the gas outflow hole, between the inflow hole and the outflow hole, The inner holes of a group having a large number of inner holes arranged in parallel with each other, which are located in a checkered pattern, form an inflow passage of the gas to be treated by being plugged by the end side opening A gas processing device in which a columnar filter element in which the inner hole of the No. group is plugged at the opening on the other end side to form an outflow passage for the processed gas is used as a filter, and a method of using the device. Is proposed. In this type of gas treatment apparatus, the gas to be treated permeates the inflow passage of the filter element and passes through the partition wall of the inner hole to flow out to the outflow passage, while dust in the gas to be treated is trapped on the side surface of the inflow passage of the partition wall. Gathered.

[0003]

By the way, the gas treatment apparatus has various problems as described below. (1) In the gas processing apparatus, after a predetermined time of operation, the dust in the gas to be processed adheres to the partition wall surface of the filter to a considerable extent to increase the pressure loss of the filter and lower the filter function. For this reason, it is necessary to separate the dust adhering to the partition wall surface to regenerate the filter function, and in general, a backwashing mechanism is provided. The backflushing mechanism is equipped with a jet nozzle that ejects backflushing gas such as pressurized air and pressurized nitrogen, but it is essential to backflush with as little backflush gas as possible during backflushing. ..

(2) In the gas treatment device, the installation of filters in the casing, maintenance and inspection of the installed filters are important tasks, and fixing and removal to and from the casing are facilitated by simple means. It is essential that you can do it.

(3) In the gas treatment apparatus, it is necessary to dispose a plurality of filters in order to enhance the gas treatment capacity. However, a plurality of filters are provided in the casing so that the area occupied by the apparatus is as small as possible. To place
The filters may be arranged in a plurality of stages in the vertical direction. However,
In the gas processing device, the communication passage of the gas to be processed is in communication with the upstream end of the filter and the dust discharge hole, and the dust separated from the filter by backwashing falls through the communication passage into the dust discharge hole. The dust concentration becomes higher as it goes downward in the communication passage, and the lower the filters are, the more heavily loaded the dust becomes.

Therefore, it is an object of the present invention to solve at least one of these problems.

[0007]

The first invention of the present invention is as follows:
-An inner hole with one end side plugged and the other end side open and another end side with the other end side plugged-A large number of inner holes with the other end side open in parallel. A filter comprising one or a plurality of columnar filter elements forming a passage and the other forming an outlet passage for the treated gas is provided between the inflow hole and the outflow hole in a casing having a gas inflow hole and a gas outflow hole. Is a gas processing device arranged horizontally or vertically, and a jet nozzle for jetting a back cleaning gas facing the downstream end of the filter,
A regulating member for regulating the backward flow of the backwash gas ejected from the ejection nozzle is disposed on the rear side of the ejection nozzle opposite to the side where the filter is disposed.

A second aspect of the present invention has a large number of inner holes which are closed at one end and open at the other end and a plurality of inner holes which are closed at the other end and open at the other end. One of the two inner holes forms an inflow passage for the gas to be treated and the other inner hole forms an outflow passage for the treated gas. A gas processing device, which is disposed horizontally or vertically between the inflow hole and the outflow hole in a casing having an outflow hole, wherein the casing and one side of the filter are used as a fixing means of the filter to the casing. It is characterized by adopting a fixing means for interposing a packing made of an elastic material, and pressing the filter from the other side of the filter to the packing side with a pressing bolt.

A third aspect of the present invention has a large number of inner holes which are closed at one end and open at the other end and a plurality of inner holes which are closed at the other end and open at the other end. One of the two inner holes forms an inflow passage for the gas to be treated and the other one forms an outflow passage for the treated gas. And a gas processing device having a gas outlet hole and a dust outlet hole in a lower portion, the gas treating apparatus being horizontally arranged between the inlet hole and the outlet hole, wherein the filters are vertically arranged in a plurality of stages. It is characterized in that they are arranged so as to intersect with each other, and communication passages for the gas to be treated which communicate with the upstream ends of these filters and the dust discharge holes are independently provided.

[0010]

In the gas treating apparatus of the first invention having such a structure, the regulating member is arranged at the rear of the ejection nozzle on the side opposite to the side where the filter is arranged, and ejects from the ejection nozzle. Since the flow of backwash gas is restricted to the rear, most of the backwash gas that is ejected while the backwash gas is suppressed from scattering is guided from the downstream end of the filter to the gas outflow hole and to the gas inflow hole side. Can be discharged. Therefore, a large backwashing effect can be obtained with a small amount of backwashing gas.

Further, in the gas treatment apparatus according to the second aspect of the present invention, as a fixing means for fixing the filter to the casing, a packing made of an elastic material is interposed between the casing and one side of the filter to fix the filter. Since the fixing means that pushes the packing side from the other side of the filter with the pressing bolt is adopted, it is not necessary to use a large number of mounting bolts as in the past, and the fixing work of the filter can be done from one direction. As a result, fixing work and removal work become easy.

Furthermore, in the gas treating apparatus according to the third aspect of the present invention, the filters are arranged in a plurality of stages in the vertical direction and intersect each other, and the upstream ends of these filters and the dust discharge. Since the communication passages for the gas to be processed, which communicate with the holes, are provided independently of each other, it is possible to evenly distribute the dust load of the filters arranged on the upper stage side and the filters arranged on the lower stage side. Is.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show a gas treatment apparatus according to the present invention. The gas treatment apparatus includes an apparatus body 10, a pair of upper and lower gas filters 20a and 20b, and a backwash mechanism 30. The apparatus main body 10 includes a cylindrical casing 11 and a partition wall member 1 disposed inside the casing 11.
The casing 11 has a gas discharge hole 11a at the top and a dust discharge hole 1 at the bottom.
1b and has a pair of inflow holes 11c for the process gas in the upper side and a pair of inflow holes 11d for the process gas in the intermediate side.

As shown in FIGS. 1 to 3, both partition members 12 and 13 are fixed in a casing 11 to form two accommodating chambers R1 and R2 at the top and bottom, and four communication passages P1 and P2.
And has wall portions 12b, 13 having openings 12a, 13a in a pair of two wall portions facing each other.
b and walls 12c and 13c having no opening at all. In addition, the two partition members 12 and 13 are separated from each other by 9
The openings 12a and 13a are arranged so as to intersect with each other at 0 degrees.
Is displaced by 90 degrees. The first communication passage P1 is the first
It communicates with the gas inflow hole 11c and the dust discharge hole 11b, and also communicates with the first storage chamber R1 through the opening 12a of the first partition member 12. The second communication passage P2 communicates with the second gas inflow hole 11d and the dust exhaust hole 11b, and also communicates with the second storage chamber R2 through the opening 13a of the second partition member 13. The first and second storage chambers R1 and R2 communicate with each other through a communication hole 12d provided at the bottom of the first partition member 12, and the storage chambers R1 and R2 accommodate filters 20a and 20b.

Each of the gas filters 20a and 20b is a filter 21 to 2 formed by stacking a plurality of filter elements each having a plurality of rectangular columnar ceramic honeycomb structures integrated.
4, 25 to 28 are horizontally arranged in four rows. Each filter has the same structure, and one end of each of the many through holes of the honeycomb structure is plugged in a staggered arrangement,
Moreover, the other end opening of the through hole whose one end opening is plugged is open. In addition, in the through hole having the opening on one end side, the opening on the other end side is plugged. As a result, the large number of through holes are divided into two groups, a gas inflow hole and a gas outflow hole, and the gas to be processed that has flowed into the gas inflow hole passes through the partition wall and flows out into the gas outflow hole, and is discharged as a processed gas. To be done. Such structures and functions of filters are known.

The first gas filter 20a has a first storage chamber R1.
And the second gas filter 20b is housed in the second storage chamber R2, and the inflow hole side of each filter 20a, 20b has an opening 12a, 13a of each partition member 12, 13.
Is facing. Therefore, the gas to be treated that has flowed into the first communication passage P1 from the first gas inflow hole 11c of the casing 11 flows through the opening 12a of the first partition member 12 into the inflow hole of the first filter 20a and the partition wall. Permeate to the outflow hole and is discharged to the atmosphere through the exhaust hole 11a as a treated gas. Further, the gas to be treated, which has flowed into the second communication passage P2 from the second gas inflow hole 11d of the casing 11, passes through the opening 13a of the second partition wall member 13 into the inflow hole of the second filter 20b and the partition wall. Permeate to the outflow hole and is discharged to the atmosphere through the exhaust hole 11a as a treated gas.

Thus, the backwash mechanism 30 is shown in FIGS.
As shown in (1), it is provided corresponding to each of the filters 21 to 24, 25 to 28, and has a backwashing gas supply pipe 31 having a plurality of ejection nozzles, and a gas regulating member 32. A plurality of supply pipes 31 are provided for each filter on the outflow hole side (downstream side) of each filter. Also,
A gas regulating member 32 is disposed downstream of the location where each supply pipe 31 is disposed. The gas regulating member 32 has a wall portion 32a
Has a plurality of openings 32b in the vertical and horizontal directions, and covers the rear part of each supply pipe 31.

The rectangular filter elements forming the filters 21 to 24 and 25 to 28 are fixed in the casing 11 at the corners in the vertical and horizontal directions by the fixing means 40 shown in FIGS. 6 and 7. There is. Fixing means 40
Is a packing 41 made of an elastic material and a pressing bolt 42. The packing 41 includes a flange portion 43 provided on the filter element and the wall portions 12b, 1 of the partition wall members 12, 13.
Flange part 4 provided between the 3b and the other side
A pressing bolt 42 is screwed onto the No. 4 so as to be able to move forward and backward. The pressing bolt 42 faces the flange portion 43, and the flange portion 43 is attached to the wall portions 12 b and 13 via the packing 41.
It is pressed against b. Thereby, each filter element is fixed to each partition member 12, 13.

In the gas treating apparatus having such a structure, the gas to be treated flows into the communicating passages P1 and P2 from the first inflow hole 11c and the second inflow hole 11d of the casing 11 and also into the first communicating passage P1. The gas to be treated is the partition member 1.
2 from the opening 12a into the filter 20a from the upstream side, permeate the partition of each through hole, flow out from the opening 32b of the gas regulating member 32, and as a treated gas, the discharge hole 1
Emitted from 1a to the atmosphere. During this period, the backwashing gas is regularly supplied to each supply pipe 31 and is ejected from the ejection nozzle to the downstream side of the filter 20a to remove the dust trapped in the partition wall. 12
It flows out from b to the 1st communicating path P1, and is discharged outside from discharge hole 11b.

Further, the gas to be treated which has flowed into the second communication passage P2 flows from the opening 13a of the partition wall member 13 into the filter 20b from its upstream side, passes through the partition walls of the respective through holes, and opens in the gas regulating member 32. The gas flows out from the portion 32b and is discharged to the atmosphere through the discharge hole 11a as a processed gas. During this period, the backwashing gas is regularly supplied to each supply pipe 31 and is ejected from the ejection nozzle to the downstream side of the filter 20b to remove the dust trapped in the partition wall.
From the third opening 13b to the second communication passage P2, the lungs are discharged to the outside from the discharge hole 11b.

By the way, in the gas treatment apparatus,
The following three means are adopted and each has the following effects.

(1) In the gas treatment apparatus, since the gas regulating member 32 is disposed behind the supply pipe 31 to regulate the backward flow of the backwash gas ejected from the ejection nozzle, It is possible that most of the backwashing gas that is jetted while suppressing the scattering of the wash gas flows into the filters 20a and 20b from the downstream side of the filters 20a and 20b and discharges to the upstream side of the filters 20a and 20b. it can. Therefore, a large backwashing effect can be obtained with a small amount of backwashing gas.

(2) In the gas treatment apparatus, as a fixing means for fixing the filter elements of the filters 20a, 20b to the partition members 12, 13, the partition member 12,
13 and the flange portion 43 provided on the filters 20a and 20b
A pressing bolt 42 in which a filter element is screwed to a flange portion 44 with a packing 41 made of an elastic material interposed therebetween.
Since the means for pressing against the partition members 12 and 13 via the packing 41 is adopted, it is not necessary to employ a large number of mounting bolts as in the conventional case, and the fixing work of the filter can be performed from one direction. This makes fixing work and removal work easier.

(3) In the gas treating apparatus, each of the filters 20a and 20b is vertically arranged in two stages and is separated from each other by 9 stages.
The filters 20a, 2 are arranged so as to cross each other at 0 degrees.
0b upstream side and the dust discharge hole 11 of the casing 11
Since the communication passages P1 and P2 for the gas to be processed, which communicate with b, are provided independently of each other, the filter 2 disposed on the upper stage side is provided.
0a and the load of dust on the filter 20b arranged on the lower side can be distributed substantially evenly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view schematically showing the configuration of a gas treatment device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 showing the arrangement of filters in the gas processing apparatus.

FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1 showing the arrangement of filters in the gas processing apparatus.

FIG. 4 is a partially enlarged vertical sectional view of the gas processing apparatus.

FIG. 5 is a partially enlarged cross-sectional view of the gas treatment device.

FIG. 6 is a partially enlarged vertical sectional view of another portion of the gas treatment device.

FIG. 7 is a partial enlarged cross-sectional view of another portion of the gas treatment device.

[Explanation of symbols]

10 ... Device main body, 11 ... Casing, 11a ... Gas outflow hole, 11b ... Dust discharge hole, 11c, 11d ... Gas inflow hole, 12, 13 ... Partition member, 20a, 20b ... Filter unit, 21-24, 25-28 ... filter, 30 ...
Backwash mechanism, 31 ... Supply pipe, 32 ... Gas regulating member, 4
0 ... Fixing means, 41 ... Packing, 42 ... Pressing bolt,
43, 44 ... brackets. P1, P2 ... Communication passage, R1, R2
… Accommodation room.

Claims (3)

[Claims] 1. An inner hole having an end side plugged and the other end side open, and an inner hole having the other end side plugged and having a large number of inner holes open at the end side, one of these inner holes being provided A filter comprising one or a plurality of columnar filter elements forming an inflow passage for the gas to be treated and the other for forming an outflow passage for the treated gas is introduced into the casing having a gas inflow hole and a gas outflow hole. A gas treatment device horizontally or vertically disposed between the hole and the outflow hole, the ejection nozzle ejecting the backwashing gas facing the downstream end of the filter, and the filter in the ejection nozzle. A gas treatment device, wherein a regulating member for regulating the backward flow of the backwashing gas ejected from the ejection nozzle is disposed on the rear side opposite to the side where the gas is disposed. 2. An inner hole having an end side plugged and the other end side open, and an inner hole having the other end side plugged and having a large number of inner holes open at the end side arranged side by side, and one of these inner holes is provided. A filter comprising one or a plurality of columnar filter elements forming an inflow passage for the gas to be treated and the other for forming an outflow passage for the treated gas is introduced into the casing having a gas inflow hole and a gas outflow hole. A gas treatment device arranged horizontally or vertically between the hole and the outflow hole, wherein a packing of an elastic material is interposed between the casing and one side of the filter as a fixing means of the filter with respect to the casing. And a fixing means for pressing the filter from the other side of the filter to the packing side with a pressing bolt. 3. An inner hole having an end side plugged and the other end side open, and an inner hole having the other end side plugged and having a large number of inner holes open at the end side, and both of these inner holes are provided. A filter comprising one or a plurality of columnar filter elements forming an inflow passage for the gas to be treated and the other for forming an outflow passage for the treated gas is provided with a gas inflow hole and a gas outflow hole in the upper part and a filter element in the lower part. A gas processing device horizontally disposed between the inflow hole and the outflow hole in a casing having a dust discharge hole, wherein the filters are arranged in a plurality of stages in the vertical direction and intersect each other. A gas treatment device, wherein a communication passage for a gas to be treated, which communicates with an upstream end of each filter and the dust discharge hole, is independently provided.