JPH02174909A - Dust collecting filter device for exhaust gas - Google Patents

Abstract

PURPOSE:To prevent clogging due to dust by providing an exhaust gas influent passage and a cleaned gas effluent passage and a fine porous material layer, and disposing the exhaust gas influent passage and the cleaned gas effluent passage so that the gas is vertically passed through the fine porous material. CONSTITUTION:A gas permeable element 1 consists of a thick porous layer 3 and a thin fine porous layer 4. The fine porous layer 4 and a wall body part 3a constitute a plane plate type gas permeable wall. The exhaust gas is made flow in from a direction A and flow out to a direction B. Spacer parts 3b make parts 3c to be gas passages when the element is piled up on other element. The fine porous layer 4 consists of the layer having pores of several mum diameter which are smaller than that of the porous layer 3, and makes the clogging to be difficult to grow as well as acts to prevent the clogging.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a filter device for collecting exhaust gas and dust.

[Conventional technology]

Conventional exhaust gas dust collection filter devices include those using a cylindrical filter and those using a flat filter. In the case of flat filters, the filters are stacked horizontally.

[Problem to be solved by the invention]

A cylindrical filter has a low utilization rate and is undesirable because it increases the size of the device. A flat filter placed horizontally in a trench has the disadvantage that dust cannot be removed effectively.

In addition, conventionally, no measures have been taken to prevent clogging with dust in either case.

The present invention (1) Structure that can be made smaller.

(2) Structure that prevents dust from damaging the filter.

(3) Structure that makes it easy to remove dust stuck in the filter.

An object of the present invention is to provide a filter device for collecting exhaust gas and dust having the following features.

[Means to solve the problem]

The present invention has solved the above-mentioned problems, and includes: a plurality of vertical exhaust gas inflow paths entering from above and going downward; a plurality of horizontal purified gas outflow paths leading to side exits; and a thick porous layer with the same pores. a thin fine pore layer having pores with a smaller diameter than the pores of the solid layer, and vertically partitioning the exhaust gas inflow path and the purified gas outflow path with the fine pore layer facing the exhaust gas inflow path side; This invention relates to a filter device for collecting exhaust gas and dust, which has a plurality of flat gas permeable walls made of a material.

[Effect]

In the device of the present invention, since the fine pore layer is provided on the exhaust gas side of the gas permeable wall, the exhaust gas inflow path and the waste permeable wall are vertically provided, so that the waste gas contained in the exhaust gas is removed by backwashing. Dust tends to fall downward. Furthermore, since the gas permeable walls are in the form of flat plates, by maintaining appropriate spacing between the gas permeable walls, it is possible to create a device with high space utilization efficiency and to downsize the device.

〔Example〕

1 to 3 show @1 embodiment of the present invention.

Figures 1(a) and 1(b) show filter elements made of ceramic material used in this example;
#'i Gas-permeable element 1, the same figure (b) shows gas-impermeable element 2.

Figure 1 (a) shows a gas permeable element with a one-thick porous layer 3 and thin pores/! ! It consists of 4. The porous layer 3 is a portion made of air permeable open cells, and is composed of a wall portion 3a and a spacer portion 3b. Pore/44
is a layer with a pore diameter of several μm, which is smaller in diameter than the bubbles of porous N43.

The fine pore layer 4 and the wall portions 3a and K constitute a flat gas permeable wall. This element is designed to allow exhaust gas to flow in from the direction of arrow A in the figure and to permeate and flow out in the direction of arrow B. Spacer part 3b
This is to maintain the spacing when overlapping one element with another element, as will be described later. Also, when the elements are stacked in this way, the portion 30 in the figure becomes the gas flow path. Since the pore diameter of the fine pore layer 4 is small, clogging due to dust is unlikely to occur, and in combination with a device that blows out backwashing gas, which will be described later, dust can be easily removed, so that it has a clogging prevention effect. This is an eggplant book.

The gas impermeable element 2 shown in FIG. 1(b) consists of a porous material [3] and a glaze layer 5. The porous layer 3 is of the same quality and shape as that used in the gas permeable element 1 described above. The glaze layer 5 is coated and fired on the flat surface of the porous layer 13 in order to prevent ventilation of the porous layer 13. Since this element 2Fi gas is not intended to permeate, the part 3 in the figure does not need to be porous or made of ceramic material.
As will be described later, in this example, element 1 and element 2 are overlapped and bonded and used in high-temperature gas, so heat resistance and thermal expansion coefficients need to match. Therefore, they are made of the same material.

FIG. 2 shows the element block 6 used in this embodiment. FIG. 5A is a side view of the device, and also shows the vertical direction in the state of use. FIG. 5B is a plan view of the element block viewed from above (in the direction of arrow A in the figure). Element block 6 is element 1
and elements 2 are alternately stacked and bonded so that the directions of the gas flow paths 3c are perpendicular to each other, and the overall shape is compact. Reference numeral 7 in the figure is a stop plate for closing the open side of the gas flow path to form a gas flow path or for closing an unnecessary open end, and the contact surface with the element is bonded. As described later, this element plotter is used by closing the lower part of the device when filtering dust in exhaust gas.

In FIG. 2, 151 gases during dust filtration are indicated by arrows.

In FIG. 2, during dust filtration, soot 12 and exhaust gas are injected from the upper surface of the seven element block L1 along arrow A, and flow vertically downward into the element block from the open end of the element 2.

This exhaust gas is gas Il'I11. of element 2. The dust passes through the gas permeable wall made up of the fine pores N4 of the element 1 and the wall portion 3a from the passageway while being filtered. The purified gas travels horizontally through the gas flow path of element 1 toward the open end and flows along arrow B from the side of the element block.

Figure 3 shows the aforementioned element bronze. This shows a cross-sectional view of an exhaust gas dust collection filter unit (tt) with the bottom covered with a casing.The element block 6 is drawn in the center.
This is shown in FIG. 2(a) as a sectional view of the same block 6 viewed from the direction of arrow C. In the upper half, element 2 is shown with a solid line, and in the lower half, element 1 is shown with a solid line. In the figure, 8 is a casing, 91 is an exhaust gas inflow duct, 10V', i is a purified gas outflow duct,
11 is a dust hopper. Further, 12 is a discharge valve provided at the bottom of the hopper. When performing exhaust gas filtration with this device, it is closed, and when exhausting dust, it is opened after stopping the injection of exhaust gas. 13 is a backwash pipe with many small holes on its surface, 14 is a backwash valve installed on the pipe, and 15 is a backwash gas (gas or air) in the backwash pipe.
It is a backwash gas source for sending.

In this device, when performing dust filtration, the discharge valve 12
Inject exhaust gas along arrow A with the door closed. The gas flows through the opening of the element block 6.
It enters the tank, passes through the gas permeable wall of element 2, is purified, and flows out in the direction of arrow B K ff). The dust contained in the 4 lid gas at -4 tt adheres to the surface of the pore layer 10 of the gas permeable wall.

When using this device, backwashing is sometimes performed to remove dust that has settled on the fine pore layer 11. At this time t''1, the backwash valve 14 is opened, and the backwash gas sent from the backwash gas source 15 is ejected from the small hole of the backwash vibrator. The backwashing gas passes through the gas t;η in a direction Vζglτ opposite to that during dust filtration. Dust flows through the gas passage of element 1.
, and put it in the hopper.

In Niremen (I) of this device, the fine pore layer 4 is provided on the side that comes into contact with the exhaust gas containing dust, thereby preventing dust from entering the pores of the porous layer and causing visual clogging. Also, dust is only attached to the surface.
Therefore, during backwashing, I/C+ can be easily removed and dissolved by backwashing gas. tJF gas inflow path is vertical VC
, Since the gas permeable walls provided are also vertical, it is easy for dust t-i to fall off.

FIG. 4 shows an element block 6' of a second embodiment of the present invention.
shows. Same figure (a) Vi side view, same 1's1 (11
) is a plan view seen from the north. This embodiment is the same as the first embodiment except for the configuration of the V1 element block.

The illustrated element block 6' is composed of only the gas permeable element 1 shown in FIG. A sealing plate 7 is attached to the side except for the purification gas outlet. Niremen that composes the exhaust gas intake channel)
1 is in contact with the fine pore layer 4 and has a symmetrical shape as if it were a partition plate, so the exhaust gas passes through this part,
Therefore, there is no need to use the element 2 having a medicinal layer. As a component of the element block,
Using homogeneous products is effective in preventing mistakes during assembly.

In this block, exhaust gas flows along arrow A7C and flows in 12, and purified gas flows along arrow B.

Although the internal flow is slightly different from the first embodiment, the population and exit flow are the same as in the first embodiment.

As described in detail above, in this embodiment 1/C, the filter block is constructed by stacking the filter elements in layers, which is useful for downsizing the entire apparatus R. In addition, the fine pore layer prevents clogging, and dust can be easily removed during backwashing. Since the exhaust gas inflow path and the gas permeable wall are vertical, the dust that is brushed off naturally falls downward and is deposited in the hopper, making post-processing easy.

〔Effect of the invention〕

Since the exhaust gas dust collecting filter device of the present invention is constituted by a flat gas permeable wall, the space utilization efficiency is good and the device can be downsized. Furthermore, since a fine pore layer is provided on the surface of the gas permeable wall that comes into contact with the exhaust gas, clogging due to dust is prevented and dust can be easily removed during backwashing. Further, since the exhaust gas inflow path and the gas permeable wall are vertical, the dust that is brushed off easily falls and is therefore easy to dispose of.

[Brief explanation of the drawing]

Figure 1g1 (a) is a perspective view of a gas permeable element used in the first embodiment of the present invention, Figure 1 (b) is a perspective view of a gas impermeable element of the above embodiment, and Figure 2 (a) is a perspective view of the gas impermeable element of the above embodiment. FIG. 4(a) is a side view of the element block of the embodiment, FIG. 4(b) is a plan view of the element block, FIG. (141I side view of the same figure) is a plan view of the above element block. DESCRIPTION OF SYMBOLS 1... Gas permeable element, 2... Gas impermeable element, 3... Porous layer, 3a... Wall body part, 3b...
Spacer part, 3C...Gas flow path, 4...Porous layer, 5...Glaze layer, 6.6'...Niremendobukur1tsu, 7...Sealing plate, 8...Casing ,
9... Exhaust gas inflow duct, 10... Purified gas outflow duct, 11... Dust hopper, 12...
- Discharge valve, 13... Backwash valve, 14... Backwash valve, 15... Backflow gas source.

Claims (1)

[Claims] A plurality of vertical exhaust gas inflow passages entering from above and going downward; a plurality of horizontal purification gas outflow passages leading to side exits; and a thick porous layer and a thin slit having pores smaller in diameter than the pores of the same porous layer. and a plurality of flat gas permeable walls made of a ceramic material that vertically partition the exhaust gas inflow path and the purified gas outflow path with the fine pore layer facing toward the exhaust gas inflow path. Features a filter device for collecting exhaust gas and dust.