DE1458893A1 - Device for treating exhaust gases from a metallurgical furnace - Google Patents

Description

DR..W. SCHALK DIPL.-ING. PETER WlRTH '-DIPL.-JNG.G. E. M. DANNENBERG · DR. V. SCHMIED-KOWARZIK

FRANKFURT AM MAIN OR. MCHINHIIMm STK. »9

12/13/1965

PW / lu / la ■ Case 64J298

as 64: 300

Soppers Company, Inc.
Pittsburgh, PA., USA

Device for treating exhaust gases from a metallurgical furnace

The invention relates to a receiving device for hot substances flowing out of metallurgical furnaces, e.g. exhaust gases, and relates in particular to an evaporation absorption device for use in a basic and oxygen-operating furnace, e.g. a steel converter.

When steel is made in such a furnace, oxygen is blown onto the surface or into a metal bath located in a converter} this creates large amounts of hot, escaping substances such as gases, smoke and dust. These substances fall in an amount in the order of 4,950 m / min or more, and its temperature can 1.93O ⁰ C or more. These hot exhaust gases are generally first taken up by a receiving or collecting hood, the one in the still floating one, on October 23, 1964 by Hartmann Mitchell and Alexander T. Dortenzo

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application filed in the United States of America Ser. Ho. 406 114 (corresponding to the German patent application K 57 336 Vla / I8b) described device can be the same. The gases are cooled from around 1,930 ° C to a temperature of around 649 ° O in such a receiving hood. The gases then flow into an evaporation chamber, in which they are further cooled and humidified by means of water atomizers or spray nozzles arranged at suitable points within this chamber.

The cooled gases expand in the evaporation chamber and lose most of their speed, so that they can be treated further after flowing through this chamber.

A known evaporation chamber consists of heavy, internally water-cooled plates. Such chambers have a massive and heavy steel construction} therefore and because of the weight of the cooling water in the plates are a massive supporting structure and a correspondingly strong foundation is required.

The evaporation chamber according to the invention has a generally hollow treatment space with side walls and closure devices at its ends and with inlet and outlet openings for the flowing gases formed at suitable points in the side walls. Part of the chamber or container is

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designed as a sprinkler or .. Befeuohtungteil and has arranged at a distance from one another on vertical pipes which form a frame on which a plurality of one another connected, downwardly and inwardly inclined panels is detachably attached, the panels being the walls surrounding the gas of the sprinkling part of the chamber.

A flowable cooling medium, e.g. water, is introduced into the pipelines forming the frame and flows into them at the top and flows through horizontal lines lying adjacent to the upper ends of the pipelines forming the frame the end. The cooling medium escapes on the plates and flows downwards as PiIm. That flowing downward as a film Cooling medium is collected in trough-shaped or trough-shaped collecting or collecting devices at points that follow one another at intervals caught, overflows and overflows in these facilities again as Ulm further downwards. In this way it is achieved that the cooling medium, while flowing down to the lower end of the sprinkling part, is repeatedly collected and anew is distributed, after which the cooling medium is appropriately distributed derived*

The exhaust gases flow into the lower part of the cooling and evaporation chamber, a _f yorzugaweise at a unteresten the end of the loading. The trickle or humidification zone of this chamber adjacent Stellet flow in this upwards and out at a point adjacent to the head end of the chamber.

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The closure at the lower end of the device according to the invention has a funnel in which dirt and other material particles washed out of the outflowing gases collect and from which they are removed.

The invention is "for example" below with reference to the drawings described in more detail, namely shows

Pig. 1 is a view of an evaporation receiving chamber for gases according to a preferred embodiment of the invention}

]? ig. 2 shows a sectional view along the line II-II of FIG. 1;

Fig. 3 shows, on a larger scale, a view of part of the sprinkling zone after Pig. 1;

Pig. 4 is a sectional view along the line IV-IV of Pig. 3;

Pig. Figure 5 is a sectional view along line V-V of Pig. 3 and Pig. Figure 6 is a schematic view of the Pig device. 1 in a basic furnace system that works with oxygen.

Pig. 1 shows an evaporation chamber for exhaust gases, generally designated 11, with a rectangular upper part 13 , a rectangular lower part 15 and with a truncated pyramid-shaped funnel part 17.

The upper part 13 has four vertical, flat plates 19 which are connected to one another at their vertical longitudinal edges

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-uifl a grass pipe with a substantially rectangular cross-section form. The upper end of part 13 is open, but is preferably closed by means of a valve or shut-off device 21 stored in the interior, which will be discussed further below will. In one of the vertical walls 19 adjacent to the valve device 21 there is a gas outlet line 23 preferably with a round cross-section. This line 23 is designed as a throttle valve or butterfly valve Throttle or shut-off device 25 is provided and continues in the gas outlet line 27.

The lower part or the sprinkling zone 15 is integrally connected to the lower end of the upper chamber part 13 and has a frame 29 which is arranged at a distance from one another te, vertical lines lying at the corners / meanwhile

33

these lying rectangular pipes / possesses. Between Corner ducts 32 are a plurality of vertically arranged, inclined plates 31 attached to the walls of the lower Form chamber part 15 (Fig. 3 and 4).

The vertical corner lines 32 generally have a square cross-section. In the embodiment shown in the drawing, they have cross-sectional dimensions of 152.4 ^x 152.4 mm and a wall thickness of 5.2 mm. On each side surface of the lower part 15 are located between the Eokleitungen 32 im

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generally two vertical intermediate lines 33. In the one shown Embodiment, these intermediate lines have a rectangular cross section of 101.6 χ 152.4 mm "with a wall thickness of 5.2 mm.

The upper and lower ends of the vertical lines 32, 33 are closed with suitable closure means, e.g. with plates 34, closed, which are welded to the walls of the lines or attached to them in another suitable manner can. In the vicinity of the upper end of the lines 32, 33 there is a transverse and horizontal line 35 » This line is expediently connected to a connector projecting from a wall of one of the vertical lines 32, 33 37 connected. Such a connection can be made with a suitable coupling 39 », for example a Victaulic coupling, getting produced. The horizontal line 35 is at its free end that is adjacent to the next vertical line is closed with a plate 41 which can be welded to the line 35. The horizontal line 35 also has in its downwardly directed wall a longitudinal slot 43 which is relatively narrow and practically over the entire length of the Line 35 runs (Fig. 4).

Each inclined plate 31 has a flat plate, which is conveniently is supported by angle pieces 47 at their vertical edges. The elbows 47 are in a suitable V / eise,

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ζ. B. by welding, attached to the plate 45 "} the plate 31 is in each case between adjacent vertical lines 32, 33 by means of nuts that are attached to the walls of the lines 32, fastened studs 48 are screwed, held in place. To accommodate the stud bolts 48 have the Elbows 47 on one edge slots 49. In this way it is achieved that the plates easily in the interior of the chamber part 13 can be installed and just as easily removed. Each plate 31 is inclined downwardly, approximately as in FIG Fig. 4 shown, and the lower edge of the respective upper plate is approximately at the same level with the upper edge of the next one lower plate. A generally horizontal closure and sealing plate 51 is near the lower edge of one each plate attached to this, for example by welding, and extends over the upper, horizontal edge of the next, plate underneath (Fig. 4). The horizontal closing plate 51 is not on the top edge of the next, however, attached to the plate underneath, but just rests against it. As a result, although the horizontal end plate forms between adjacent vertical plates create a seal flowing off Gases, but still allows the plate to which it is attached to be easily removed whenever necessary.

down and
The plates 31 are, as mentioned, / inclined inwards, so that water flowing through the horizontal line 35 and exiting through the longitudinal slot 43 onto the inner / vertical surface

essentially

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which hits the plates and flows down as a film of water. With the exception of the top plate, every plate is close by At its upper end a trough-shaped or trough-shaped distribution device 53 is provided, by means of which the water is collected and is redistributed. The collecting and distributing device 53 runs across the plate 31 and is closed at its ends so that the water can collect therein. the Trough or recess 53 is spaced from the surface of the plate to which it is attached by means of suitable spacers 57 is held. The distribution trough 53 is preferably substantially perpendicular to the surface of the plate to which it is attached is, arranged (Pig. 4), and between it and the plate one or more spaces or through openings are formed.

It is zv / angular, under each channel 53 a plurality at intervals to arrange mutually arranged support brackets or consoles 59, each of which has an opening 61, the purpose of which will be described further below. These brackets can be welded to the channel 53 as well as to the plate 45 or in be attached in any suitable manner.

Near the lower edge of the lowermost plate 31 is one Supply line 63 is provided for the sprinkling water (3 ig. 1 and 2), which is connected to the vertical corner lines 32 and the

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'Intermediate lines 33 is connected. From Figures 2 and 6 it can be seen that in one side of the chamber 11, namely in the lower part bäw. the sprinkling zone 15, an opening 65 is located. The upper end of a hood 67 provided on a basic and oxygen-operating furnace, as shown and described in the aforementioned, pending application, is connected in a suitable manner to the chamber 11 via this opening. As mentioned earlier, the substances or gases flowing out of such a furnace 70 flow on the way over the hood 67 into the evaporation chamber 11 according to the invention. The exhaust gases flow through the opening 65 into the chamber 11 and essentially upwards through the whole chamber 11 through.

The upper end of the lower part or the sprinkling zone 15 is expediently at the lower end of the upper chamber part 13 attached. Such a connection is preferably made by means of a sliding connection, which is an am outer circumference of the upper end of the lower chamber part 15 'has provided angle piece 69 which is arranged so that it is with the walls 19 of the upper chamber part 19 in sliding contact.

The pipes 32, 33 are connected to one another at the upper end and in an appropriate manner by means of a U-shaped

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Part 71 fastened at a distance from one another, the part 71 », as shown at 73, is screwed to a plate 75 which in turn is attached to the pipelines in any suitable manner. Between the upper ends of the pipes 32, 33 is a vertically downwardly extending plate 77, which, as shown at 79, in appropriate Way is bent knee-shaped in such a way that a lower portion 81 of the plate downwards and outwards to the uppermost plate 31 is directed towards. This lower section 81 expediently forms part of a gas seal and also serves to deflect the water that emerges from the horizontal pipe 35 against the plate 31.und on the plate 45 a film of water forms. The plate 77 running vertically downwards

en

is conveniently attached to angle pieces by means of screw / bolt 85 83 attached, which in turn are attached to the vertical tubes 32, 33 (Pig. 4).

The sliding connection between the elbow 69 and the walls 19 is through two more elbows 87, .89, which, as in Pig. 4 shown, can be welded together, from contamination protected. The angle piece 89 can be attached to the walls 19,

en
as shown, be fastened by means of screw / bolts 91 or in some other suitable manner. The angle pieces 87, 89 are arranged essentially in such a way that / efSe legs of the angle piece 87 at a distance from and parallel to the upright

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Leg of the elbow 69 runs. The downward leg of the elbow 87 thus extends over the vertical leg of the elbow 69 addition and in this way forms a seal for the sliding connection.

The one in Pig. 1, the funnel-shaped chamber part 17 shown is in one piece connected mit.dem lower end of the sprinkling zone 15. The funnel part 17 consists of a substantially straight section 95 and a truncated pyramid-shaped section 95 * which is attached to the former by means of bolts 97, for example. The walls of the truncated pyramid-shaped section 95 are stiffened in an appropriate way by angle pieces 99 that run laterally and that are arranged in the vertical direction in abs. The lower end of the frusto-pyramidal Section 95_ is by means of two matching, screwed together planes 101 with a conventional one Line 103 for the discharge / äüü the exhaust gas washed out solid particles connected.

The evaporation chamber 11 is expediently on different

Levels supported by a dedicated facility, for example by one of the evaporation chamber surrounding, consisting of elbows device 105, which in expedient Way with an adjacent Traglooden 107 and adjacent · Beams 109 connected 1st. (Pig. 1 and 2) The chamber 11 can

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by a corresponding construction, e.g. by horizontal Beams and supports 111, to be supported in the vertical direction and / or held vertically.

It is desirable to provide platforms and handrails 113 for operators at different levels in the chamber, Es It is furthermore desirable to provide conduits 115 running all the way around the chamber at other levels, which are arranged in rows Supply water to spray nozzles 117 arranged within the chamber. Such an arrangement of stages and lines is in Pig. 1 suggested.

When a basic furnace 70 operating with oxygen is in operation, the hot exhaust gases, as mentioned earlier, pass over the hood 67 through the opening 65 into the evaporation chamber. The gases then have a temperature of about 649 ⁰ C · However, the dry, hot exhaust gases contain dirt and other foreign matter that must be removed, and the gas must be cooled before further treatment. The exhaust gases rising up in the chamber 11 meet the water emerging from the spray nozzles 117, which cools the gases, and the moistened dirt particles fall down into the funnel part 17, from which they are removed via the line 103.

Water is circulated in the supply line 63 and by means of one or more pumps (not shown) in the corner or

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Intermediate lines 32, 33 promoted upwards. The water then flows in the horizontal lines 35 and emerges from deep long slots 4-3 in the form of a water film. The film of water that both on the top plate 31 and on the plate section 81 meets, flows in a designated in Fig. 4 with A first zone, down over the surface of the top plate. Bs is collected in the first distribution troughs 53 until it is in it has reached a certain height at which it is due to the upwardly inclined arrangement of the channel over the rear or outer The edge of the bowl overflows. The overflowing water then in turn forms water films on the plates in the designated with B. Zone. These latter y / water films flow through the whole Zone B, in the same way as the former, down the inner surfaces of the plates and collect in the troughs below these plates. The water collects in these distribution channels up to a level where it is above the Overflows the trailing edges of the gutters and forms further films on the plates in a zone marked with C. In this way the cooling water flows intermittently over the plates downwards until it has reached the lowest end of the sprinkling zone 15, • where * it is in a lowest one, of which the chamber 11 enclosing Elbow 105 formed gutter is collected. The cooling water can then be drained off in a suitable manner.

According to the invention, the plates 31 have such dimensions that they can be replaced quickly and easily. It may be,

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that such plates must be removed and replaced from time to time. It can be seen that each plate is simply Loosening the nuts on the stud bolts 48 can be removed. You can then by attaching a lifting device

associated with this

direction, e.g. a / shackle in the provided in the bracket 59 Holes 61 can be removed by moving the plate inward and then moving it up through the top of the Chamber 11 takes out. The panels according to the invention are simpler and cheaper and significantly lighter than the previously used cooling jacket plates.

In the preferred embodiment of the invention shown and described herein, the chamber 11 has a rectangular cross-section, and the vertical corner and intermediate lines 32, 33 are substantially rectangular. It is understood, however, that the invention does not apply to the embodiment shown and described is restricted * The chamber and ducts can be cylindrical, oval, or square if preferred or any suitable shape and arrangement.

According to the invention, the frame made up of pipelines bears the weight of the plates 31 and in the lines of the frame all of the cooling and trickling water supplied is conveyed to the head part of the trickling zone of the chamber. In addition, the panels are arranged in a simple and convenient manner on the frame so that the panels can be removed quickly and easily when required.

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According to the invention, the frame consisting of pipelines occurs in place of the conventional headers and the conventional Pipeline system through which the water is usually too common spray nozzles arranged in rows. Headers and piping systems are expensive to install and expensive to maintain. It is a feature of the invention that the Cooling medium, which in most cases will be water, has several functions. First, the medium flows through the pipes of the frame and cools them, while it flows to others Purposes is directed upwards. Second, it affects the flow down over the inner plate surfaces and as Film spread water in the exhaust gas by evaporating it into the grass stream. Thirdly, that which is spread out as a film cools Cooling medium the surface of the plates, as the medium constantly evaporates into the gases flowing through the chamber *.

The above is a new one. Receiving device for outflowing substances or a new vaporization chamber for these substances for use in basic and oxygen-working ovens described. Such a chamber is light in weight, easier to build and to maintain, and for cooling and treatment. ; <3.es _; : Gases; is more effective and better '· and more economical than domestic, known devices for receiving and treating exhaust gases from metallurgical furnaces. ■ -, <

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Claims (1)

; 14Ö8Ö93 ν, .- .:, 13.12.1965 Koppers Company, "Inc. (^ Frank« * · 'a.Main oase 64 * 298 ' Gr. Eschenheimer sir. 39 Pittsburgh, PA., USA & 64s300 Claims 1, device for treatment, preferably for cooling and Cleaning of hot exhaust gases containing solid particles from a metallurgical furnace, in particular a basic one Blown steel converter, with an elongated treatment space having an inlet and an outlet opening for the exhaust gases and means arranged therein for introducing flowing coolants and / or cleaning agents, e.g. Water, the exhaust gases if desired before entering the Treatment room in an exhaust gas collection hood arranged on the furnace are pretreated, characterized in that the devices for introducing coolants and / or cleaning agents into the treatment room (11) at a distance from one another substantially vertical pipelines (32,33) arranged on the outside of the treatment room exist and a support frame (29) for the walls (31) of the treatment room (11), at least one supply line (63) connected to the vertical pipelines for the Cooling and / or cleaning agent is provided, and that ·. ■■ · .. =. ■ = ■■■■ ■ - '■' ■ · - ² 80 9902/035 9 inside the treatment room between the upper ends of two or more adjacent vertical pipelines a line (35) extending essentially horizontally and transversely to the vertical lines is connected to at least one of the two vertical lines at its upper end and one or more in its wall Openings (43) for dispensing the coolant and / or cleaning agent onto the surface of the Has walls (31). 2. Device according to Anspruoh 1, characterized in that within the support frame (29) extending from top to bottom and towards the lower end inwards into the treatment room (11) inclined plates (31) next to each other and below or above each other between the vertical pipes (32,33) and are attached to these, preferably releasably, the panels with the vertical lines at least the walls a part (15) of the treatment room (11). 3. Apparatus according to claim 2, characterized in that each vertical pipe (32,33) at its upper end with each one of the substantially horizontally extending transverse lines (35) is connected, and that in a horizontal direction between two adjacent vertical pipes each one of the inclined plates (31) is arranged. 4. Device according to one of the preceding claims, daduroh characterized in that at least one trough-shaped or trough-shaped device (53) surrounding the treatment room for collecting on the inside of the plates (31) 8099-02 / 0359 herabflie 13enden cooling or cleaning agent beneath at least ten an waagerech- formed from these plates' ^J mantle zone (A or B or 0) of the wall of the treatment chamber (11) and the upper end of the next lower mantle zone following plate or plates (31 ) is arranged and has emptying openings (at 57) in such an arrangement that the coolant or cleaning agent is distributed over the plate "or plates of the next lower zone. 5. Apparatus according to claim 4> characterized in that the trough-shaped or channel-shaped device (53) essentially facing the interior of the treatment room (11) Running along inner surfaces of the inclined plates (31) and at such a distance (at 57) from these inner surfaces these and is arranged inclined to the horizontal, that between the inner surface of each plate and that adjacent to it- ' th side wall of the channel-shaped device (53) or several passage channels are formed for the coolant or cleaning agent overflowing over this side wall are. 6 * Device according to one of the preceding claims, characterized in that preferably on the outside of the treatment room. (11) a plurality of ring lines (115) for the supply of cooling and / or cleaning fluid arranged in the position of one another and with in the interior of the treatment room spray nozzles (117) provided in rows are connected - 4 809902/0359 7ο Device according to one of the preceding claims, characterized in characterized in that the inlet opening (65) for the exhaust gases to be treated in. Near the lower end and the Outlet opening (23) is provided in the vicinity of the upper end of the treatment room. 8. Device naoh one of the preceding claims, characterized in that one as a butterfly valve or throttle valve trained shut-off device (21) is provided in the vicinity of the upper end of the treatment room (11). 9. Device according to one of the preceding claims, characterized in that a Auffangtriohter (17) for receiving the humidified in the treatment room (11) and washed out of the exhaust gas Solid particles at the lower end of the treatment room is provided· The patent attorney 809902/0359