DE2345211B1

DE2345211B1 - Device for the thermal treatment of the flue gases from processing plants for bituminous mix

Info

Publication number: DE2345211B1
Application number: DE2345211A
Authority: DE
Inventors: Dietrich Martens
Original assignee: HEISE ALFELDER EISEN
Current assignee: HEISE ALFELDER EISEN
Priority date: 1973-09-07
Filing date: 1973-09-07
Publication date: 1974-11-21

Description

Auch Anlaufvorgänge in der Aufbereitungsanlage für bituminöses Mischgut sind besser beherrschbar. Um die Entstaubungsanlage auf Betriebstemperatur vorzuwärmen, ist es nicht mehr erforderlich, den Brenner der Trockentrommel zu benutzen. Es wird lediglich der Heißgaserzeuger des Wärmetauschers betrieben, wobei die vom Rauchgasventilator aus der Trockentrommel abgesaugte Luft im Wärmetauscher aufgeheizt wird, so daß die Entstaubungsanlage ohne Kondenserscheinungen die Betriebstemperatur erreicht Ganz wesentlich ist dabei, daß die termische Belastung der Trockentrommel vermieden wird.Also start-up processes in the processing plant for bituminous mix are more manageable. To preheat the dedusting system to operating temperature, it is no longer necessary to use the dryer drum burner. It will only the hot gas generator of the heat exchanger operated, with the one from the flue gas fan Air sucked out of the drying drum is heated in the heat exchanger so that the dedusting system reaches operating temperature without condensation It is very important that the thermal load on the drying drum is avoided will.

Der Heißgaserzeuger ist in aller Regel mit einem Mischluftventilator versehen, der zusätzlich oder an Stelle der Ventilatoren zur Führung des Behandlungsgases vorgesehen ist. Lediglich zum Zwecke der Erhöhung der Temperatur der Rauchgase wird der Brenner des Heißgaserzeugers betrieben, während die Ventilatoren bzw. der Mischluftventilator immer dann allein betrieben werden, wenn eine Kühlung der Rauchgase erfoderlich ist. Der Brenner des Heißgaserzeugers ist in Abhängigkeit von der Austrittstemperatur der Rauchgase aus dem Wärmetauscher schalt- oder regelbar. The hot gas generator is usually with a mixed air fan provided, in addition to or instead of the fans for guiding the treatment gas is provided. Merely for the purpose of increasing the temperature of the flue gases is the burner of the hot gas generator operated while the fans or the mixed air fan operated alone whenever a cooling of the flue gases is necessary is. The burner of the hot gas generator depends on the outlet temperature the flue gases from the heat exchanger can be switched or regulated.

Der Erfindungsgedanke ist an Hand bevorzugter Ausführungsbeispiele in den Zeichnungen dargestellt und im folgenden erläutert. Es zeigt F i g. 1 einen schematisierten Querschnitt durch die Vorrichtung, F i g. 2 eine schematisierte Ansicht der Vorrichtung in einer ersten Ausführungsform und F i g. 3 eine schematisierte Ansicht der Vorrichtung in einer zweiten Ausführungsform. The idea of the invention is based on preferred exemplary embodiments shown in the drawings and explained below. It shows F i g. 1 one schematic cross section through the device, F i g. 2 a schematic View of the device in a first embodiment and FIG. 3 a schematic View of the device in a second embodiment.

Die Vorrichtung zum thermischen Behandeln der Rauchgase besitzt einen Wärmetauscher 1, in dessen Innern durch eine Vielzahl von plattenförmigen Wänden 2, Kanäle3 zur Führung der Rauchgase und Kanäle 4 zur Führung des Behandlungsgases gebildet sind. Am Anschluß S treten die Rauchgase in den Wärmetauscher 1 ein. Über den Anschluß 6 verlassen die thermisch behandelten Rauchgase den Wärmetauscher. The device for the thermal treatment of the flue gases has a Heat exchanger 1, inside by a plurality of plate-shaped walls 2, channels 3 for guiding the flue gases and channels 4 for guiding the treatment gas are formed. The flue gases enter the heat exchanger 1 at connection S. Above leave connection 6 the thermally treated flue gases enter the heat exchanger.

Der Wärmetauscher 1 wird hier beispielsweise im Kreuzstrom betrieben, wobei Axialventilatoren 7 zur Führung des Behandlungsgases, z. B. Kühlluft, am Eingang der Kanäle 4 vorgesehen sind. Ebenfalls am Eingang der Kanäle 4 ist ein Heißgaserzeuger 8 angeordnet, der einen Brenner 9 und einen Mischluftventilator 10 besitzt. Wie Fig. 2 zeigt, kann der Mischluftventilator 10 relativ groß ausgelegt sein und die Aufgaben der Axialventilatoren 7 zusätzlich übernehmen. Es ist aber auch möglich, wie in F i g. 3 dargestellt, daß Axialventilatoren und Mischluftventilator 10 nebeneinander vorgesehen sind. In diesem Fall kann der Mischluftventilator 10 kleiner ausgelegt werden. The heat exchanger 1 is operated here, for example, in cross flow, axial fans 7 for guiding the treatment gas, e.g. B. cooling air, at the entrance of the channels 4 are provided. There is also a hot gas generator at the entrance to ducts 4 8, which has a burner 9 and a mixed air fan 10. As Fig. 2 shows, the mixed air fan 10 can be designed to be relatively large and the Take on tasks of the axial fans 7 in addition. But it is also possible as in Fig. 3 shown that axial fans and mixed air fan 10 side by side are provided. In this case, the mixed air fan 10 can be designed to be smaller will.

Die Vorrichtung kann sowohl zum Kühlen als auch zum Erhitzen der Rauchgase eingesetzt werden. Zu Kühlzwecken werden allein die Axialventilatoren 7 und/oder der Mischluftventilator 10 betrieben. Zu Aufheizzwecken wird der Brenner 9 des Heißgaserzeugers8 eingeschaltet bzw. in Abhängigkeit von der Austrittstemperatur der Rauchgase geregelt. Mit dieser Vorrichtung ist es möglich, bei sämtlichen Betriebsbedingungen die Rauchgase in einem optimalen Temperaturbereich der Entstaubungsanlage zuzuführen, so daß Betriebsstörungen, wie im Stand der Technik bekannt, vermieden werden. The device can be used both for cooling and for heating Flue gases are used. Only the axial fans are used for cooling purposes 7 and / or the mixed air fan 10 operated. The burner is used for heating purposes 9 of the hot gas generator 8 switched on or depending on the outlet temperature the flue gases regulated. With this device it is possible under all operating conditions to supply the flue gases to the dedusting system in an optimal temperature range, so that malfunctions, as known in the prior art, are avoided.

Claims

Claims: 1. Device for the thermal treatment of the flue gases of processing plants for bituminous mix with a heat exchanger, the channels for guiding the flue gases and channels separated from them for guiding the treatment gas having, wherein the channels for guiding the treatment gas connected to fans are, characterized in that a hot gas generator having a burner (9) (8) provided and at the entrance of the channels (4) for guiding the treatment gas is connected to the heat exchanger (1).

2. Apparatus according to claim 1, characterized in that the hot gas generator (8) is provided with a mixed air fan (10).

3. Apparatus according to claim 1 and 2, characterized in that the mixed air fan (10) is provided instead of the fans (7).

4. Apparatus according to claim 2 or 3, characterized in that the burner (9) of the hot gas generator (8) as a function of the outlet temperature the flue gases from the heat exchanger (1) can be switched or regulated.

The invention relates to a device for thermal treatment the flue gases from processing plants for bituminous mix with a heat exchanger, the channels for guiding the flue gases and channels separated therefrom for guiding the Having treatment gas, the channels for guiding the treatment gas Fans are connected.

Processing plants for bituminous mix usually have an elongated drying drum for heating the rock minerals. In this Drying drum, the rock minerals are heated by a burner. The heated ones Flue gases inevitably lead fine rock particles out of the rock to be heated away with himself. The flue gases are usually sent to dedusting systems, which can be equipped with cloth filters. The ones in the cloth filter dust collectors The cloths used may only be exposed to a certain permissible temperature will. It is therefore known to be between the drying drum and the cloth filter dedusting system to switch on a heat exchanger, which only serves as a cooler for the flue gases and can also be designed as a pre-separator. This heat exchanger has Chambers for guiding the flue gases and corresponding chambers for guiding the cooling air, the z. B. is pressed with axial fans through the corresponding chambers. The flue gases are cooled through the chamber walls. by the type of material to be reprocessed the flue gases with too low a temperature in the filter dedusting, so that the water vapor contained in the flue gases condenses. This is made up of dust and water-forming sludge clogs the cloths and the conveyor elements of the dedusting system, which makes it inoperable.

It is known to remedy this deficiency, for example the internals to be changed in the drying drum in such a way that by a relatively smaller material veil in the drum the heat transfer deteriorates and the outlet temperature of the Flue gases is increased. When processing certain materials for which a Relatively high flue gas outlet temperature from the drying drum already present was, the cooler is not sufficient to cool the flue gases so that their temperature is low enough to act on the filter cloths.

On the other hand, attempts have also been made in the flue gas pipe to install a so-called auxiliary burner and the flue gases before entering the Heat up the filter cloths. This solution requires a considerable amount of additional material and due to the often changing operating conditions in the flue gas line, there is an uncertainty in the perfect function of the auxiliary burner. There is a risk of soot formation and thus the clogging of the filter cloths.

In addition, there are processing plants for bituminous mix the further problem that these systems started up from the cold state Need to become. The cloth filter dedusting system must be at operating temperature be preheated to avoid falling below the dew point and deposits will. As a rule, the burner of the drying drum is used for this purpose, whereby the drying drum is operated without rock minerals. The thermal load the drying drum is in this condition and the resulting wear considerable.

It is the object of the present invention to provide the described To eliminate disadvantages and to show a device of the type described above, with which it is possible, regardless of the type of material to be processed, the To supply flue gases to the dust extraction system in an optimal temperature range.

This is achieved according to the invention in that a burner having hot gas generator provided and at the entrance of the channels for guidance of the treatment gas is connected to the heat exchanger. This makes it possible the temperature of the flue gases before entering the cloth filter dedusting system to increase or decrease according to the prevailing operating conditions. The heat exchanger can be operated in a simple manner as a heater or as a cooler. It is with it in all cases possible, the optimal temperature range of the flue gases in the dust extraction system to adjust.