GB2248562A

GB2248562A - A chimney installation

Info

Publication number: GB2248562A
Application number: GB9021269A
Authority: GB
Inventors: Paul Martyn Hallett
Original assignee: F E BEAUMONT Ltd
Current assignee: F E BEAUMONT Ltd
Priority date: 1990-10-01
Filing date: 1990-10-01
Publication date: 1992-04-15
Anticipated expiration: 2010-10-01
Also published as: GB9021269D0; GB2248562B

Abstract

A chimney installation (2) comprises a chimney and a 16 cyclone separator arrangement (4) which is mounted beside the chimney adjacent a base part of the chimney and which is for removing particulate matter from flue gases from common inlet (14) before the flue gases enter the chimney, the cyclone separator arrangement (4) comprising a pair of cyclone separators (6, 8) which are connected together and which are each provided with a helical device such as a blade (10, 12), which acts during use to deflect incoming gases downwardly and tangentially for the purpose of separating particulate matter from the flue gases. The chimney may be single or multi flue. <IMAGE>

Description

A CHIMNEY INSTALLATION This invention relates to a chimney installation and, more especially, this invention relates to a chimney installation for the separation of particulate matter from flue gases.

In an our United Kingdom patent specification No.

1409064, we have described and claimed a chimney installation for the separation of particulate matter from flue gases. This chimney installation comprises a chimney and a cyclone separator arrangement which is mounted beside the chimney adjacent a base part of the chimney.

The chimney installation described in our patent is required to be of a large size. More specifically, in order for the chimney installation to work efficiently and with little pressure lost, the flue gases passing through it have to be slowed down to about 12 m/sec, and this in turn means that a typical chimney installation needs to be about ten times higher than the diameter of its flue inlet.

It is an aim of the present invention to provide a chimney installation which is able to utilise the advantages of the chimney installation of our above mentioned patent, but which is able to be produced in a considerably reduced size.

Accordingly, this invention provides a chimney installation comprising a chimney and a cyclone separator arrangement which is mounted beside the chimney adjacent a base part of the chimney and which is for removing particulate matter from flue gases before the flue gases enter the chimney, the cyclone separator arrangement comprising a pair of cyclone separators which are connected together and which are each provided with a helical device which acts during use to deflect incoming gases downwardly for the purpose of separating particulate matter from the flue gases.

Usually, the helical device will act during use to deflect the incoming gases downwardly and tangentally.

The two cyclone separators may advantageously have a common gas inlet, and separate gas outlets.

Each cyclone separator may comprise a hollow column with an upper tangential inlet leading to the helical device, the helical device extending within an annular space between a cylindrical outer shell portion of the column and an inner outlet pipe which projects downwardly into the column, the lower end of the pipe being open within the column for the entry of the gases and the upper end of the pipe communicating with the base part of the chimney so as to lead the gases into the base part of the chimney, the lower end of the column having an outlet aperture for the passage of particulate material separated from the gases.

Preferably, the helical device is a helical blade which extends for one complete revolution about the outlet pipe, the blade spanning the annular space between the outlet pipe and the cylindrical outer shell portion of the column.

Preferably, the inlet has a depth in a vertical direction coinciding with the vertical dimension spanned by the helical blade. The said one complete revolution may start and finish at an angular position coinciding with the tangential transition between the inlet and the hollow column.

The inlet may be one which is of rectangular cross section, having a width in a horizontal direction equal to the radial dimensions of the annular space.

Preferably, the open lower end of the pipe is disposed below the lower extremity of the helical device.

The lower end of the cylindrical shell portion may adjoin a downwardly tapering frusto-conical shell portion leading to the outlet aperture.

The chimney installation of the present invention may be such that with a comparable pressure loss as would occur in the chimney installation of our United Kingdom patent specification No. 1409064, the chimney installation of the present invention would be much smaller, for example 70% in all directions. Size for size, compared with the chimney installation of our previous patent specification, the chimney installation of the present invention would have only approximately one quarter of the original pressure loss. It will thus be seen that the chimney installation of the present invention is able to work extremely efficiently and with little pressure loss, even over relatively small sizes of installation.

An embodiment of the invention will now be described solely by way of example and with reference to the accompanying drawings in which: Figure 1 is a front view of a chimney installation; Figure 2 is a side view of the chimney installation; Figure 3 is a top plan view of the chimney installation; Figure 4 is a front view which is similar to that shown in Figure 1 but in which part of the chimney installation is omitted in order to show more detail on the remaining part of the chimney installation; Figure 5 is a top plan view of the part of the chimney installation as shown in Figure 4; Figure 6 is a view on the line B-B shown in Figure 4; and Figure 7 is a top plan view of a frame part of the chimney installation as shown in Figure 1.

Referring to the drawings, there is shown part of a chimney installation 2. The chimney installation 2 comprises a chimney (not shown) and a cyclone separator arrangement 4 mounted beside the chimney adjacent a base part of the chimney. The cyclone separator arrangement 4 is for removing particulate matter from flue gases before the flue gases enter the chimney.

The cyclone separator arrangement 4 comprises a pair of cyclone separators 6, 8 which are connected together as shown and which are each provided with a helical device 10, 12 which acts during use to deflect incoming gases downwardly and tangentially for the purpose of separating particulate matter from the flue gases. The cyclone separators 6, 8 have a common gas inlet 14 and separate gas outlets 16, 18 respectively.

Each gas outlet 16, 18 may form part of a hollow column.

The helical device is preferably a helical blade which extends for one complete revolution about its gas outlets 16 or 18. The helical blade may be as constructed and described in detail in our UK patent specification No. 1409064.

As can be seen from the drawings, each cyclone separator 6, 8 has a downwardly tapering frusto-conical shell portion 20 leading to an outlet aperture 22 for the passage of particulate matter separated from the flue gases.

The cyclone separators 6, 8 are mounted on a frame 24 which has a top part 26 and sloping legs 28 as shown. The legs 28 stand on the ground 30. The overall shape of the frame 24 can best be seen from Figures 3 and 7.

The cyclone separators 6, 8 have a common flange 32 which is provided with bolt holes 34 for enabling the cyclone separators 6, 8 to be bolted to the top part 26 of the frame 24, see Figures 4 and 6.

The cyclone separators 6, 8 may themselves be formed in two separate parts constituted by an upper part 36 and a lower part 38. These two parts may be bolted together via bolt hole 40 as shown in Figure 6.

In use of the chimney installation 2, flue gases pass along the gas inlet 14 and are caused to follow a helical path due to the presence of the helical blade.

This causes particulate matter to be separated from the flue gas by cyclone separation. The separated particulate matter tends to drop down within the cyclone separators 6, 8 into the shell portions 20 and to the outlet apertures 22. The particulate matter can be collected as desired from the outlet apertures 22. Thus, for example, a separate container (not shown) may be attached to the end of each outlet aperture 22. The flue gases having particulate matter separated out are then free to pass upwardly through the gas outlets 16, 18 and into the chimney.

The chimney may be a single chimney or a multi flue chimney.

It is to be appreciated that the embodiment of the invention described above with reference to the accompanying drawings has been given by way of example only and that modifications may be effected. Thus, for example the shape of the cyclone separators 6, 8 may be varied if desired, as may be the shape of the frame 24.

Claims

1. A chimney installation comprising a chimney and a cyclone separator arrangement which is mounted beside the chimney adjacent a base part of the chimney and which is for removing particulate matter from flue gases before the flue gases enter the chimney, the cyclone separator arrangement comprising a pair of cyclone separators which are connected together and which are each provided with a helical device which acts during use to deflect incoming gases downwardly for the purpose of separating particulate matter from the flue gases.

2. A chimney installation according to claim 1 in which the helical device acts during use to deflect the incoming gases downwardly and tangentially.

3. A chimney installation according to claim 1 or claim 2 in which the two cyclone separators have a common gas inlet, and separate gas outlets.

4. A chimney installation according to any one of the preceding claims in which each cyclone separator comprises a hollow column with an upper tangential inlet leading to the helical device, the helical device extending within an annular space between a cylindrical outer shell portion of the column and an inner outlet pipe which projects downwardly into the column, the lower end of the pipe being open within the column for the entry of the gases and the upper end of the pipe communicating with the base part of the chimney so as to lead the gases into the base part of the chimney, the lower end of the column having an outlet aperture for the passage of particulate material separated from the gases.

5. A chimney installation according to claim 4 in which the helical device is a helical blade which extends for one complete revolution about the outlet pipe, the blade spanning the annular space between the outlet pipe and the cylindrical outer shell portion of the column.

6. A chimney installation according to claim 5 in which the inlet has a depth in a vertical direction coinciding with the vertical dimension spanned by the helical blade.

7. A chimney installation according to claim 5 or claim 6 in which the said one complete revolution starts and finishes at an angular position coinciding with the tangential transition between the inlet and the hollow column.

8. A chimney installation according to any one of claims 4 to 7 in which the inlet is of rectangular cross section, having a width in a horizontal direction equal to the radial dimensions of the annular space.

9. A chimney installation according to any one of claims 4 to 8 in which the open lower end of the pipe is disposed below the lower extremity of the helical device.

10. A chimney installation according to any one of claims 4 to 9 in which the lower end of the cylindrical shell portion adjoins a downwardly tapering frusto-conical shell portion leading to the outlet aperture.

11. A chimney installation substantially as herein described with reference to the accompanying drawings.