GB2272593A

GB2272593A - Measuring the burden profile in a shaft furnace

Info

Publication number: GB2272593A
Application number: GB9323353A
Authority: GB
Inventors: Hans-Otto Kreuz
Original assignee: Dango and Dienenthal Maschinenbau GmbH
Current assignee: Dango and Dienenthal Maschinenbau GmbH
Priority date: 1992-11-13
Filing date: 1993-11-12
Publication date: 1994-05-18
Also published as: GB9323353D0; LU88418A1; DE4238704A1; JPH06212223A; BE1007697A6

Abstract

The apparatus 2 is inserted into the furnace head 4 and has a lance 5 which carries a measuring head 6 with a radar sonde at its front end. The lance 5 is positioned horizontally but non-radially, with the measuring head being at the point on the line of the lance closest to the central axis of the furnace (Fig 3). During operation of the furnace 1, the lance 5 adopts a fixed measuring position outside the range of action of a rotating chute 16 entering into the furnace head 4 for charging the furnace 1 with ore, aggregates and coke. During subsequent operation of the blast furnace 1, the surface profile 3 of the burden can be measured as required by scanning the field of view of the radar sonde included in the measuring head 6 of the lance 5 diametrically across the burden 3 in the furnace chamber 17 to obtain a depth 18 profile. <IMAGE>

Description

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Description

2272593 Title: Apparatus for measuring the burden profile in a shaft furnace The invention relates to an apparatus f or measuring the burden profile in a shaft furnace, comprising a radar device arranged at the front end of a lance and scanning the surf ace of the burden without contact, the direction of radiation of which can be pivoted through a def ined angle to both sides about the longitudinal axis of the lance.

For optimum operation of a shaft furnace, especially a blast furnace, it is important, inter alia, to have precise knowledge of the burden surface profile, wherein, especially with respect to the automation of large blast furnaces, it must be possible to obtain evaluation of this knowledge which accurately reflects the facts in order to obtain the most uniform furnace charge possible and a reproducible surf ace prof ile of the burden.

DE 37 15 762 Al describes a generic apparatus for measuring the burden profile, having a tubular lance with a measuring head which is inserted into the. furnace chamber in the radial direction in a horizontal plane below the furnace head only for measuring purposes and otherwise adopts a rest position outside the furnace chamber, so that the furnace can be charged with ore, aggregates and coke. The entire drive f or the insertion and withdrawal of the lance with the measuring head is situated on a platform which is mounted on a frame mounted on the furnace.

The f rame construction and the drive for the measuring lance require capital costs approximately equivalent to the purchase price of the profile measuring apparatus.

The aim of the invention is to develop the generic measuring apparatus in such a manner that the tubular lance with the measuring head can remain in the measuring position during operation of the furnace and thus the drive for the lance and the frame with the platfoi;.in for receiving the lance drive can be dispensed with.

This problem is solved according to the invention by a measuring apparatus with the features according to the single claim.

By virtue of the fact that the lance of the profile measuring apparatus carrying the measuring head with a radar donde is inserted in the furnace head outside the range of action of the feeding device for the ore, aggregates and coke entering into the furnace head, the lance can remain in the measuring position during operation of the furnace, so that the surface profile of the burden can be measured if necessary via the diameter of the cylindrical furnace chamber and the depth. As no drive is required for---theinsertion and removal of the measuring lance in and out of the furnace, the frame with the platform for mounting the measuring lance drive required in the generic measuring apparatus according to DE 37 15 762 A1 can be dispensed with and the measuring apparatus can be mounted on the furnace hood. The measuring lance can be shorter as a result of the fact that the diameter of the furnace head into which the generic measuring apparatus is inserted is smaller than the diameter of the cylindrical furnace chamber. The constructional differences between the profile measuring apparatus according to the invention and the generic measuring apparatus available on the market described hereinbefore allow for a considerable reduction in capital costs when fitting shaft furnaces with the new measuring apparatus.

The invention will now be described in more detail with respect to a shaft furnace with a chute and a furnace with a bell for feeding of the ore, aggregates and coke with reference to the accompanying schematic drawings, in which:

Figure 1 Figure 2 Figure 3 is a longitudinal section of a furnace head with a chute and the new profile measuring apparatus; is a longitudinal section of the furnace head according to Fig. 1 offset by 900; is a top view of the furnace head according to Figures 1 and 2, and Figures 4 to 6 are views corresponding to Figures 1 to 3 of a furnace head with a bell and the new measuring apparatus.

The blast f urnace 1 according to Figures 1 to 3 is provided with an apparatus 2 for measuring the surface profile 3 of the burden, which is inserted into the furnace head 4.

The measuring apparatus 2 has a lance 5 which carries a measuring head 6 with a radar sonde 7 at its f ront end. A socket 9 for the passage of the lance with a flange 10 is secured to the gas collector casing 8 of the furnace head 4, a slide valve 11, a seal 12 and an expansion joint 13 being provided on said flange.

The lance 5 with the measuring head 6 is arranged in a vertical plane 1414 which extends parallel to and at a distance from one vertical coordinate plane x-x of a system of coordinates x, y, the origin of which is situated in the centre 15 of the furnace.

During operation of the furnace 1, the lance 5 with the measuring head 6 adopts a fixed measuring position 51 outside the range of action of a rotating chute 16 entering into the furnace head 4 for charging the furnace 1 with ore, aggregates and coke. In the measuring position 51 of the lance 5, the measuring head 6 is situated in the other,vertical coordinate plane y-y of the system of coordinates x, y.

During operation of the blast furnace 1, the surface profile 3 of the burden can be measured if necessary via the diameter of the cylindrical furnace chamber 17 or the depth 18 in the vertical coordinate plane y-y by the radar probe 7 included in the measuring head 6 of the lance 5.

In order to measure the surface profile 3 of the burden, the measuring head 6 is pivoted by a motor drive through an angle wabout the longitudinal axis of the lance 5, so that the radar rays 19 of the radar sonde 7 situated in the measuring head 6 scan the entire diameter of the furnace chamber 17 in the vertical coordinate plane y-y.

1 Ir It is f urthermore possible for the lance 5 with the measuring head 6 to be rotated by a motor drive about the longitudinal axis for measuring the burden surface.

In order to measure the depth 18 at the point def ined by the measuring position of the measuring head 6, the rays 19 of the radar sonde 7 are directed vertically downwards on to the burden surface 3.

In order to set the precise measuring position 51 of the lance 5 when the prof ile measuring apparatus 2 is inserted into the furnace head 4 and f or repairs and maintenance, the lance 5 with the measuring head 6 is inserted into or withdrawn from the furnace head 4 by means of an appropriate drive 20 which can be advanced towards the furnace 1 or a crane.

Figures 4 to 6 show the insertion of the prof ile measuring apparatus 2 into the furnace head 4 of a blast furnace 1 which is provided with a bell 21 which can be lowered for the feeding of ore, aggregates and coke.

Claims

CLAIMS:

1. Apparatus for measuring the burden profile in a shaft furnace, comprising a radar sonde arranged at the front end of a lance and scanning the surface of the burden without contact, the direction of radiation of the sonde being swingable about the longitudinal axis of the lance, characterized in that the lance is inserted in the head of the shaft furnace and is arranged in a vertical plane parallel to and spaced from the first of two vertical planes which intersect in the central axis of the furnace and are orthogonal to each other, and that the lance is located outside the range of action of the feeding device for the ore, aggregates and coke entering into the furnace head with the radar sonde. situated in the region of the second vertical plane.

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2. Apparatus f or measuring the burden prof ile in a shaft furnace, comprising a radar sonde arranged at the f ront end of a lance and scanning the surf ace of the burden without contact, the direction of radiation of which can be pivoted through a defined angle to both sides about the longitudinal axis of the lance, characterised in that the lance (5) with the measuring head (6) provided at the front end thereof for receiving the radar sonde (7) is inserted in the head (4) of the shaft furnace (1) and is arranged in a vertical plane (14-14) which extends parallel to one vertical coordinate plane (x-x) of a system of coordinates (x, y), the origin of which is situated in the centre point (15) of the furnace, and that the lance (5) adopts an adjustable measuring position (51) fixed during operation of the furnace (1) outside the range of action of the feeding device for the ore, aggregates an coke entering into the furnace head (4), e.g. in the form of a rotating chute (16) or a bell (21) which can be lowered, the measuring head (6) of the lance (5) being situated in the region of the other vertical coordinate plane (y-y) of the system of coordinates (X, Y) -