JPH03293010A - Dust collector - Google Patents

Abstract

PURPOSE:To prevent the breakage of a porous air-permeable ceramic cylinder erected on the opening of the partition wall of a vessel by introducing a high- pressure gas into the upper part of the vessel from a backwashing pipe in backwashing to release dust accumulated on the inner wall of the cylinder. CONSTITUTION:An exhaust gas discharge pipe 6 and a backwashing pipe 8 are connected to the upper part of the closed vessel 3, and an exhaust gas supply pipe 4 and a dust discharge pipe 5 are connected to the lower part. The vessel 3 is separated into the upper and lower parts by the partiton wall 2 having an opening (a). The porous air-permeable ceramic cylinder 101 with the upper end closed and lower end opened is almost vertically erected on the opening (a). A high-pressure gas is introduced into the upper part of the vessel 3 from the backwashing pipe 8 in backwashing to release the dust accumulated on the cylinder 101 downward. Since the pressure of the high-pressure gas acts on the outer surface of the cylinder, a compressive force is generated in the cylinder, and the ceramic cylinder is never broken.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dust collector that is applied to remove high-temperature gas from a combustion device for solid fuel such as coal.

[Conventional technology]

A conventional example will be explained with reference to FIGS. 9 to 10IIF.

In FIG. 9, a horizontal plate 2 is provided inside the container 3, and upper and lower chambers 15. ] Classified into 4. A connecting tool 16 is installed on the horizontal plate 2.
A porous, breathable ceramic film is installed with the open end facing up and the closed end facing down. The lower chamber 14 of the container 3 is provided with an air supply pipe 4 and a dust discharge pipe 5.

An exhaust pipe 6 having a valve 7 is attached to the upper chamber 15, and a backwash pipe 8 is attached to the upper chamber 15, and a high-pressure gas main pipe 9 is supplied through the valve 10.
It is connected to the.

High-temperature gas containing powder is fed from the air supply pipe 4. This gas passes through the furnace tube 1, becomes powder-free, and is discharged through the exhaust pipe 6 and valve 7.

As shown in FIG. 10(a), a gap where gas containing particles 18 from the air supply pipe 4 passes through the furnace cylinder 1 as shown by an arrow 17;
The particles 18 remain on the surface of the furnace cylinder 1 and accumulate 19 as shown in FIG. 2(b).

When it accumulates to a certain extent, backwashing is performed. For backwashing, close the valve 7, open the valve 10, and introduce the high-pressure gas in the main pipe 9 into the upper chamber 15. The particles accumulated on the surface of the F cylinder 1 will be removed from the
As shown in Figure (C), the backwashing flow 20 causes the particles to peel off from the surface of the furnace cylinder and fall. The fallen particles are discharged from the dust discharge pipe 5.

[Problems to be Solved by the Invention] In the conventional example described above, in the case of backwashing, the pressure inside the furnace cylinder becomes higher than that outside. As shown in FIG. 11, an internal pressure 22 is applied to the furnace cylinder 1, and tensile forces 23 and 24 are generated within the furnace cylinder 1.

Although the ceramic of the furnace tube 1 has high strength against compressive force,
It has a weak tensile strength and may be damaged.

[Means to solve the problem]

The present invention takes the following measures to solve the above problems.

That is, as a dust collector, there is a sealed container to which an exhaust gas discharge pipe and a backwash pipe are connected to the upper part and an exhaust gas supply pipe and a dust discharge pipe to the lower part, and an opening to separate the upper part and the lower part. A partition wall and a porous, air-permeable ceramic cylinder, which is provided substantially vertically above the opening and whose upper end is closed and whose lower end is open, are provided.

(Function) By the above means, normally, the exhaust gas containing particles is guided from the exhaust gas supply pipe to the lower part of the container.Then, the particles are filtered on the inner surface of the cylinder, and the clean gas exits to the upper part and passes through the exhaust gas discharge pipe. Particles (dust particles) fall downward and are discharged from the dust discharge pipe.

In the case of backwashing, when high-pressure gas is introduced into the upper part of the container from the backwash pipe, the dust that has accumulated on the inner surface of the cylinder is pushed inward, separated, and falls downward. The dust thus accumulated on the inner surface of the cylinder falls downward and is removed from the exhaust gas discharge pipe. Furthermore, since the pressure of the high-pressure gas is applied to the outer surface of the cylinder at this time, compressive force is generated in the cylinder, so there is no risk of damage to the ceramics. In this way, you can replace the dust collector with high reliability.

〔Example〕

A first embodiment of the present invention will be described with reference to FIG.

The closed container 3 has a backwash pipe 8 connected to its upper part and is connected to a high-pressure gas main pipe 9 via a valve 10. Further, an exhaust gas discharge pipe (exhaust pipe) 6 is connected to the upper part and has a valve 7. Furthermore, an exhaust gas supply pipe (air supply pipe) 4 and a dust discharge pipe 5 are connected to the lower part.

A partition wall (horizontal plate) 2 is provided to separate the upper and lower parts, and the partition wall 2 is provided with an opening a having a diameter equal to the inner diameter of the furnace cylinder, which will be described later. A furnace cylinder 101 made of porous, air-permeable ceramics with a closed upper end and an open lower end is placed almost vertically over the opening a of the partition wall 2 and connected with a connector 16.

In the above configuration, normally, the exhaust gas containing particles is guided from the exhaust gas supply pipe 4 to the lower part of the container 3. Thereafter, particles are exposed to the inner surface of the furnace tube 101 (see FIG. 2(a)), and clean gas comes out to the top and is discharged from the exhaust gas discharge pipe 6. Further, the particles (dust) 18 fall downward and are discharged from the dust discharge pipe 5.

Dust 18 accumulates to some extent 119 (
(See FIG. 2(b)) Then, backwashing is performed.

In the case of backwashing, the valve 7 is closed and high pressure gas is discharged from the backwash pipe 8 to the container 3.
When introduced into the upper part of the furnace cylinder 10, it accumulates on the inner surface of the furnace cylinder 10.
The dust is pushed inward, peels off, and falls downwards (
(See Figure 2(C)). In this way, the dust accumulated on the inner surface of the 7th furnace cylinder +01 is removed.

Also, at this time, as shown in Part 3, the pressure of the high pressure gas is 1
22 is applied to the outer surface of the furnace tube 101, compressive forces 123 and 124 are generated in the furnace tube 101, so there is no risk of the ceramics being damaged. In this way, you can replace the dust collector with high reliability.

A second embodiment of the present invention will be explained with reference to FIGS. 4 and 5.

In FIG. 4, an exhaust gas discharge pipe 6 is connected to the upper part of the closed container 3a. Further, an exhaust gas supply pipe 4 and a dust discharge pipe 5 are connected to the lower part. Furthermore, a lower partition wall 2a and an upper partition wall 37 that partition the upper and lower parts are provided inside the container 3a. Each partition wall 2a, 37 has opposing openings, and a cylinder 101 made of ceramic or wood is inserted into the opening.
will be provided. Details of these are shown in FIG. Partition wall 2
A metal receiving plate 2 that is thinner than the thickness of the partition wall 2a is installed in the opening a.
4 is inserted and attached. At the center of the receiving plate 24 is a furnace cylinder 1.
A hole with the same inner diameter as 0 is drilled, and the upper part is finished into a spherical band shape C. Furthermore, a hole 55 is provided around the hole to allow a temperature regulating fluid to pass therethrough. Further, a groove is bored around the upper part of the hole and a packing 27 is provided.

The lower end of the furnace tube 101 is inserted into a cap-shaped lower end block 28 . The lower end block 28 has a hole penetrating the inner diameter of the furnace cylinder 101, and the area around the hole is finished in the shape of a spherical band d corresponding to the spherical band C described above.

A support plate 36 is inserted and attached to the opening in the partition wall 37 on one side. A hole e with a diameter slightly larger than the outer diameter of the furnace tube 101 (about +10 degrees) is bored in the center of the support plate 36,
The area around hole e is finished in the shape of a torus. Further, a hole 61 is provided around the hole e for passing a temperature regulating fluid.

The lower part of the furnace cylinder 101 is supported by the support plate 24 with the lower surface of the lower end block 28 against the gasket 27, and the upper end is supported by the support plate 26.
is inserted into hole e. Note that heat insulating materials 25 and 26 are applied to the upper and lower surfaces of the receiving plate 24.

In the above configuration, normally, high-temperature (approximately 1000"C) gas containing dust is introduced from the exhaust gas supply pipe 4 to the lower part of the container 3a. The gas passes through the hole in the receiving plate 24
It is filtered from the inside of 01 and exits to the outside.

Thereafter, the exhaust gas is led to the outside through the exhaust pipe 6. The receiving plate 24 and the support plate 36 are temperature-controlled by fluid passing through the holes 25.61, which reach a considerable high temperature. The hole is formed by deformation due to this temperature, e
The shape and position of the part change. For example, the center lines 22 and 23 of the hole e before the gas introduction become the center line 22' after the gas introduction due to deformation due to temperature.

23'. However, in this case as well, the lower end of the furnace cylinder 101 is in a freely supported state simply by the lower surface of the lower block 28 sliding on the packing 27 and swinging.

In this way, external forces due to thermal deformation from the receiving plate 24 and the supporting plate 36 are not applied to the tr cylinder 101, and the lower end is always kept airtight by the packing 27.

Therefore, high reliability can be achieved. The other functions are almost the same as those of the first embodiment, so the explanation will be omitted.

A third embodiment of the invention is shown in FIG.

The top portion 102 of the furnace tube 101a in the first and second embodiments is formed tightly or non-ventilated.

In this way, one part of the furnace tube 101a is made airtight or the pores are made smaller than the other part to lower the ventilation rate (increase rigidity).
By this, the furnace cylinder 101a due to the backwash pressure during backwashing.
The deformation of the dust layer is not uniform, and the dust layer easily falls from the inner surface of the furnace cylinder 101a.

A fourth embodiment of the present invention is shown in FIG.

In the furnace tubes of the first and second embodiments, the furnace tube 101
A portion 103 of the side surface b is formed in the direction of the generatrix in a dense or air-impermeable manner. The operation is almost the same as that of the third embodiment, so the explanation will be omitted.

A fifth embodiment of the present invention is shown in FIG.

In the furnace tubes of the first and second embodiments, the tube 101
A portion 104 of the side surface of c is formed tightly or non-ventilated in the circumferential direction. The operation is almost the same as that of the third embodiment.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the first embodiment of the present invention, and FIGS.
4 is a longitudinal sectional view of the second embodiment of the present invention, FIG. 5 is a detailed view of the cylindrical portion of the same embodiment, and FIG.
The figure is a vertical cross-sectional view of the tube section of the third embodiment of the present invention, FIG. 7 is a cross-sectional view of the furnace tube section of the fourth embodiment of the present invention, and FIG. FIG. 9 is a vertical cross-sectional view of the furnace barrel, FIG. 9 is a vertical cross-sectional view of a conventional example, and FIGS. 10 and 11 are explanatory views of the operation of the conventional example. 1, 101.101a, ]01b, 101cm'
IP cylinder, 2... Compartment wall (horizontal plate), 3... Container, 4
...Exhaust gas supply pipe, 5.Dust discharge pipe, 6.
...Exhaust gas discharge pipe, 8...Backwash pipe.

Claims (1)

[Claims] A closed container having an upper part connected to an exhaust gas discharge pipe and a backwash pipe and a lower part connected to an exhaust gas supply pipe and a dust discharge pipe, a partition wall having an opening and dividing the upper part and the lower part, and a partition wall having an opening and dividing the upper part and the lower part; A dust collector comprising a porous, breathable ceramic cylinder that is installed almost vertically above the cylinder and has a closed upper end and an open lower end.