DE2112541B1

DE2112541B1 - Device for top gas extraction in high pressure blast furnaces

Info

Publication number: DE2112541B1
Application number: DE19712112541
Authority: DE
Inventors: Gerhard Dr-Ing Hausberg; Karl-Rudolf Hegemann
Original assignee: Gottfried Bischoff Bau Kompl Gasreinigungs und Wasserrueckkehlanlagen GmbH and Co KG
Current assignee: Gottfried Bischoff Bau Kompl Gasreinigungs und Wasserrueckkehlanlagen GmbH and Co KG
Priority date: 1971-03-16
Filing date: 1971-03-16
Publication date: 1972-08-03
Also published as: ZA721819B

Description

Dabei können auch mehrere Regelkörper dieses Auf-Several control bodies of this structure can also be

baus gleichsam stufenförmig hintereinandergeschaltet sein. - Neben der Gestaltung der erfindungsgemäßen Vorrichtung mit kreisförmigen Querschnitten sind auch entsprechende Gestaltungen mit rechteckigen oder quadratischen Querschnitten möglich, wobei sich die Verhältnisse auch bei rechteckigem Querschnitt nicht wesentlich ändern, jedoch in fertigungstechnischer Hinsicht Vereinfachungen erreichbar sind.baus can be connected in series, as it were. - Next to the design of the device according to the invention with circular cross-sections are also corresponding designs with rectangular or square cross-sections possible, although the relationships are not significantly different even with a rectangular cross-section change, but simplifications can be achieved in terms of manufacturing technology.

Um eine Strömung mit möglichst geringem Turbulenzgrad im Bereich des Drosselkörpers sicherzustellen und bei verhältnismäßig geringer Baulänge des Drosselkörpers in Strömungsrichtung für alle Betriebsbedingungen ausreichende Drosselung zu erreichen, kann es zweckmäßig sein, daß der Drosselkörper und/oder der umgebende Abzugskanal zusätzliche Drosseirippen aufweisen, die vorzugsweise radial angeordnet sind. Es werden so der Strömung gleichsam zusätzliche Grenzschichten einverleibt, was die Drosselwirkung verbessert. A flow with the lowest possible degree of turbulence in the area ensure the throttle body and with a relatively short overall length of the Throttle body in flow direction sufficient throttling for all operating conditions To achieve, it may be useful that the throttle body and / or the surrounding Extracting channel have additional throttle ribs, which are preferably arranged radially are. In this way, additional boundary layers are incorporated into the flow, which improves the choke effect.

Die durch die Erfindung erreichten Vorteile sind darin zu sehen, daß bei Einsatz einer erfindungsgemäßen Vorrichtung zum Gichtgasabzug bei Hochdruck-Hochöfen die Vorrichtung in den Regelkreis für den Druck im Hochdruck-Hochofen ohne weiteres einbezogen werden kann, wobei sich eine befriedigende Regeibreite erreichen läßt. Unabhängig davon wird die Drosselung durch diesen Einsatz der Vorrichtung als Regelglied praktisch nicht beeinflußt, so daß das abzuziehende Gichtgas weitgehend mit vorgegebenem Druck der weiteren Verwendung zugeführt werden kann. Geräuschbelästigung der Umwelt tritt nicht ein. Infolge der Anordnung eines Ringspaltwaschers als wesentliches Bauteil ist die erfindungsgemäße Vorrichtung ohne weiteres auch zur Aufnahme der Temperaturen in der Lage, mit denen das Gichtgas aus dem Hochdruck-Hochofen austritt. The advantages achieved by the invention can be seen in that when using a device according to the invention for top gas extraction in high-pressure blast furnaces the device in the control loop for the pressure in the high-pressure blast furnace easily can be included, whereby a satisfactory range can be achieved. Regardless of this, the throttling is achieved through this use of the device as a control element practically not influenced, so that the furnace gas to be withdrawn largely with the predetermined Pressure can be supplied for further use. Noise nuisance to the environment does not occur. As a result of the arrangement of an annular gap washer as essential Component is the device according to the invention without further ado for receiving the Temperatures at which the furnace gas exits the high-pressure blast furnace.

Gleichzeitig wird schon im Ringspaltwascher eine intensive Reinigung erreicht bzw. insofern vorbereitet, als durch nachgeschaltete Abscheider in der erfindungsgemäßen Vorrichtung benetzte Stäube abgeschieden werden können.At the same time, intensive cleaning takes place in the annular gap washer achieved or prepared to the extent that by downstream separators in the device according to the invention wetted dusts can be deposited.

Im folgenden wird die Erfindung an Hand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung ausführlicher erläutert. Es zeigt F i g. 1 einen Hochofen mit der erfindungsgemäßen Vorrichtung in der Seitenansicht, F i g. 2 einen Axialschnitt durch eine erfindungsgemäße Vorrichtung in vergrößertem Maßstab. In the following, the invention is based on a merely one embodiment Illustrative drawing explained in more detail. It shows F i g. 1 a blast furnace with the device according to the invention in a side view, FIG. 2 an axial section by a device according to the invention on an enlarged scale.

F i g. 3 einen Schnitt in Richtung A-A durch den Gegenstand nach Fig. 2 und Fig. 4 eine andere Ausführungsform des Gegenstandes nach F i g. 2. F i g. 3 shows a section in the direction A-A through the object FIGS. 2 and 4 show another embodiment of the object according to FIG. 2.

Die in den Figuren dargestellte Vorrichtung dient zum Gichtgasabzug bei Hochdruck-Hochöfen. Sie besteht in ihrem grundsätzlichen AuEbau aus einem Abzugskanal 1, der an die Gicht 2 des Hochofens 3 angeschlossen wird, und einer verstellbaren Drosseleinrichtung. Die Drosseleinrichtung weist zunächst einen Ringspaltwascher mit verstellbarem Regelkörper 4 auf, der mit dem Abzugskanal oder Mantel 5 einen verstellbaren Regelspalt 6 bildet. An den Regelkörper 4 schließt ein im wesentlichen zylindrischer oder auch kegelförmiger Drosselkörper 7 an, der mit dem Abzugskanal 1 einen Drosselspalt 8 bildet. Verstellt man den Regelkörper 4 in Richtung des Pfeiles 9, so verändert sich der Regelspalt 6 in seiner Spaltbreite, der Drosselspalt 8 jedoch nur unbeachtlich in seiner Spaltlänge 10. Das hat zur Folge, daß der Regelvorgang und der Drosselvorgang gleichsam entkoppelt sind, wobei der Regelkörper 4 ohne weiteres in den Regelkreis für den Druck im Hochdruck-Hochofen einbezogen werden kann. Wie immer nach Maßgabe dieses Regelkreises der Regelkörper 4 eingestellt wird, stets erfolgt im Drosselspalt die angestrebte Entspannung. Dabei ist die Auslegung so getroffen, daß bei dieser Entspannung eine störende Geräuschbelästigung der Umwelt nicht eintritt. The device shown in the figures is used to vent the furnace gas in high pressure blast furnaces. In its basic structure, it consists of an exhaust duct 1, which is connected to the furnace 2 of the blast furnace 3, and an adjustable one Throttle device. The throttle device initially has an annular gap washer with adjustable control body 4, which with the exhaust duct or jacket 5 a adjustable regulating gap 6 forms. At the control body 4 includes a substantially cylindrical or conical throttle body 7, which is connected to the exhaust duct 1 forms a throttle gap 8. Adjusting the control body 4 in the direction of the arrow 9, the control gap 6 changes in its gap width, the throttle gap 8 but only insignificant in its gap length 10. This has the consequence that the control process and the throttling process are, as it were, decoupled, the control body 4 readily can be included in the control loop for the pressure in the high-pressure blast furnace. As The control body 4 is always set in accordance with this control loop, always the desired relaxation takes place in the throttle gap. The interpretation is like this taken that with this relaxation an annoying noise pollution of the environment does not occur.

Im Ausführungsbeispiel nach bevorzugter Ausführungsform der Erfindung besitzt der Ringspaltwascher einen im wesentlichen kegelförmigen, in Strömungsrichtung verjüngten Regelkörper 4. Diesem Regelkörper 4 ist ein entsprechend kegelförmiger Abzugskanal oder Mantel 5 zugeordnet. Bei der Ausführungsform nach Fig. 1 ist nur ein einziger solcher Regelkegel 4 vorgesehen. Bei der Ausführungsform nach F i g. 4 sind mehrere Regelkegel 4 gleichsam stufenförmig hintereinandergeschaltet. In the exemplary embodiment according to a preferred embodiment of the invention the annular gap washer has an essentially conical shape in the direction of flow tapered control body 4. This control body 4 is a correspondingly conical Flue duct or jacket 5 assigned. In the embodiment of FIG. 1 is only a single such control cone 4 is provided. In the embodiment according to FIG. 4, several control cones 4 are connected in series, as it were, in stages.

Aus der F i g. 2 entnimmt man, daß der Drosselkörper 7 und der umgebene Abzugskanal 1 zusätzliche Drossel rippen 11 aufweisen, wodurch erreichbar ist. daß die Strömung sich unter allen Betriebsbedingungen in Bereichen mit niedrigem Turbulenzgrad bewegt. From FIG. 2 it can be seen that the throttle body 7 and the surrounding Discharge duct 1 have additional throttle ribs 11, which can be achieved. that the flow under all operating conditions in areas with a low degree of turbulence emotional.

Vor dem Regelkörper 4 befindet sich eine bei Ringspaltwaschern übliche Düse 12 zum Eindüsen einer Waschflüssigkeit. Dadurch ist die dargestellte Vorrichtung ohne weiteres zur Aufnahme der Temperaturen des Gichtgases in der Lage. Gleichzeitig wird eine Reinigung der Gichtgase erreicht, die mitgeführten Stäube werden von der Waschflüssigkeit benetzt, sie werden im Topf 13 unter der erfindungsgemäßen Vorrichtung abgefangen, wo sie als Schlammwasser oder Schlamm abgezogen werden. In front of the regulating body 4 there is one which is common with annular gap washers Nozzle 12 for injecting a washing liquid. This is the illustrated device readily able to record the temperatures of the furnace gas. Simultaneously a cleaning of the furnace gases is achieved, the dust is removed from the Wash liquid wetted, they are in the pot 13 under the device according to the invention intercepted where they are withdrawn as mud water or sludge.

Auch im Regelspalt 6 bzw. Drosselspalt 8 kann zusätzlich eine Waschflüssigkeit eingedüst werden.A washing liquid can also be used in the regulating gap 6 or throttle gap 8 be injected.

Claims

Claims: 1. Device for furnace gas extraction with pressure reduction for high-pressure blast furnaces, consisting of an exhaust duct with adjustable throttle device, characterized in that the throttle device has an annular gap washer with adjustable Control body (4) and thus adjustable rule gap (6) and on the control body (4) a substantially cylindrical throttle body (7) is connected, which with Discharge duct (1) forms a throttle gap (8).

2. Apparatus according to claim 1, characterized in that the annular gap washer an essentially conical control body which tapers in the direction of flow (4) and the regulating body (4) a correspondingly conical discharge duct (5) is assigned.

3. Apparatus according to claim 2, characterized in that several conical control bodies (4) are connected in series.

4. Apparatus according to claim 3, characterized in that the throttle body (7) and / or the surrounding exhaust duct (1) have additional throttle ribs (11).

The invention relates to a device for top gas extraction with pressure reduction in high pressure furnaces. - High pressure blast furnaces with pressing from Z. B. 3.5 ata are used in recent times to an increasing extent. The furnace gas in these high-pressure blast furnaces must be expanded to pressures of about 1 ata, for example, for further use in smelting operations and z. Am Usual industrial furnaces to be introduced as heating gas or to be burned in boilers. This pressure reduction brings about the large amounts of gas and also the high temperatures the blast furnace gases to be evacuated have considerable problems.

Devices for top gas extraction with pressure reduction in high pressure blast furnaces are known in various embodiments. Of course you can't are designed as normal reducing valves. They consist in their fundamental Construction generally from a special exhaust duct with adjustable throttle device, in turn as a plate or disk with a plurality of passages and therein adjustable reducers is constructed. The reducers are connected in parallel. These are conventional sliders or screens. That makes difficulties with large amounts of gas when a pressure regulation of the pressure is required in the high-pressure blast furnace and the reducing devices as control elements are included in a corresponding control loop. In fact, the rule width is very limited in the known embodiments. On top of that, at least for certain settings of the reducing devices (via the control loop) in the Throttle device sound flow can adjust, which is a significant noise nuisance caused.

In other areas of technology, for example in systems for cleaning Converter exhaust gases are known as so-called annular gap washers, which come from a flow channel trained coat and an adjustable built-in body exist with the jacket has an annular gap that adjusts itself with the adjustment of the installation body forms. In general, the installation body is designed as a cone and against a corresponding coat adjustable. The adjustment is used here to control the annular gap washer as a scrubber to set different converter gas quantities. The problems around the extraction of furnace gas in high-pressure blast furnaces through annular gap washers are still used today has not been affected. - The concept of the annular gap washer includes that in the direction of flow at least one nozzle is arranged in front of the installation body, with which a washing liquid, mostly water, is given up. It comes to a wetting of the entrained in the gas Dusts through this washing liquid, so that the wetted dusts behind the annular gap washer can be easily deposited.

The invention is based on the object of a device for venting the furnace gas in high-pressure blast furnaces with which over a large control range a perfect relaxation of the furnace gas can be achieved without that disturbing noise pollution of the environment occurs.

The invention relates to a device for top gas extraction with pressure reduction for high-pressure blast furnaces, consisting of a discharge duct with an adjustable throttle device. The invention consists in that the throttle device has an annular gap washer has adjustable control body and thus adjustable control gap and to the Control body a substantially cylindrical throttle body is connected to the forms a throttle gap with the exhaust duct. The regulation is according to the invention on the one hand and the throttling on the other hand, as it were separated. One achieves so without Another sufficient control width, the adjustment of the control gap reducing the throttle gap only a little along its length and therefore hardly changed in terms of flow. Consequently it is achieved that regardless of the setting of the control body of the throttle body can be interpreted in such a way that the desired relaxation is always achieved will. Without difficulty, the interpretation can always be made so that disruptive Sound flow or even overtone flow under normal operating conditions of the Device does not adjust. For this purpose it is generally sufficient to use the device to be designed and operated in such a way that the flow in all cross sections is only slight Has degree of turbulence. - The expression "essentially cylindrical throttle body" Within the scope of the invention also always includes embodiments in which the throttle body is designed to be slightly conical or slightly conical. It just has to be ensured be that the throttling effect is only slightly when the control body is adjusted changes.

In particular, there are several possibilities within the scope of the invention. Thus, a preferred embodiment of the invention is characterized in that the annular gap washer has an essentially conical shape that tapers in the direction of flow Has regulating body and the regulating body has a correspondingly conical exhaust duct part assigned.