EP2700875B1 - Method for the thermal processing of roadway rubble or oil sludge containing PAK - Google Patents

Description

The invention relates to a method according to claim 1.

Older roads were often made using a road surface using pitch (coal tar) as the binder. Since pitch contains a high proportion of PAHs (polycyclic aromatic hydrocarbons, lead substance: benzo (a) pyrene), which are harmful to the environment, the use of such is Pitch-containing road-breaking material is no longer allowed today. Therefore, the immediate reuse of only mechanically treated, pitch-bearing roadworking material in an asphalt mixing plant is eliminated. Rather, the split contained in the road breaking material must be freed of the pitch-containing binder before it can then be used to produce fresh asphalt.

A plant of the type mentioned, with which this required treatment can take place, is in the DE 10 2009 025 361 B4 described. This plant is stationarily positioned near an asphalt mixing plant. Thus, in Germany z. For example, each one central system a federal state as a catchment area. For treatment, the PAK-containing road-breaking material from the entire catchment area is transported to the stationary facility. This leads to a high transport wall. To set up the known system, a foundation is needed, which makes costly changes to the installation as well as a finally required dismantling of the plant.

Oil sludge can basically be disposed of by essentially identical procedures. With regard to their seizure and especially the location of the seizure, they may have similar problems as described above for road-breaking material. This is the case, for example, when an oil pipeline breaks.

Object of the present invention is to provide a system of the type mentioned in such a way that the costs associated with their creation, operation and possibly demolition costs are reduced.

This object is achieved by the features f) to k) of claim 1.

According to the invention, therefore, the logistics structure is compared with the prior art vice versa: While in the latter the roadside material or oil sludge is transported to the stationary, central processing plant, according to the invention, the treatment plant moves to the place of Eduktanfalls.

Surprisingly, it has also been found that the inventive concept of the mobile plant in comparison to a stationary system has a significant potential savings in the field of transport volumes and thus the transport costs. The installation, changes in the installation and disassembly of the system according to the invention require a maximum of the use of a crane. The mobile system can be converted quickly, if this z. B. is required for reasons of space. It can also be operated at temporarily assigned locations and can be removed after the execution of the process task with little effort. Finally, the modules used according to the invention can be replaced variably and quickly in the event of changes in the process control or modernization measures.

The invention is characterized in that it additionally has a module, in which the components required for the supply of the other modules, in particular a generator, tanks for operating media such as water, gas, compressed air, fuel are summarized. While the construction of a stationary plant is not possible at every location, since a basic infrastructure with respect to the supply streams is a prerequisite, in this preferred embodiment of the invention, the mobile plant can be operated at any construction site, as they are with respect to the supply of the corresponding energy sources and media self-sufficient. This provides a high degree of availability and security for the plant operator.

According to the invention, at least a part of the modules are connected to each other via shape-changing tubes or hoses. This facilitates the repositioning of the modules, if this is necessary, for example, in the further movement or the change of a construction site for reasons of space.

It has also proven to be useful to divide the plant components according to the features a) to f) into four modules. With an average capacity of the system, the required transportability of the individual modules is thus generally achieved.

Between the afterburner and the filter device, a flue gas cooler is advantageously arranged to protect the filter.

Figur 1

schematisch und in Perspektive ein erstes Ausführungsbeispiel einer mobilen Anlage zur thermischen Behandlung von PAK-haltigem Straßenaufbruchmaterial;

Figur 2

in einer ähnlichen Ansicht wie in Figur 1 ein zweites Ausführungsbeispiel einer derartigen Anlage.

Exemplary embodiments of the invention will be explained in more detail below for the case of the treatment of road breaking material with reference to the drawing. The thermal treatment of oil sludge is always carried out in same way. Show it

FIG. 1

schematically and in perspective a first embodiment of a mobile plant for the thermal treatment of PAH-containing road-breaking material;

FIG. 2

in a similar view as in FIG. 1 a second embodiment of such a system.

First, on the FIG. 1 Referenced. The plant shown here and designated overall by the reference numeral 1 is intended for mobile use at various construction sites, to which it can be transported by means of low-loaders on roads. Appendix 1 includes all the essential components necessary to carry out the above mentioned DE 10 2009 025 361 B4 described method are determined. Because of the functioning of the installed system, reference is made to this document, unless otherwise stated below. These components are divided into four modules 2, 3, 4, 5, which are supported by trailers 6, 7, 8, 9. The trailer 6, 7, 8, 9 with the components constructed thereon can be connected in a known manner with a tractor for transport.

The number of modules 2, 3, 4, 5 depends on the size of the system; In general, four modules 2, 3, 4, 5 are adequate as shown. For systems with smaller or larger capacity, fewer or more modules can be used.

On the first module 2, a filling container 10 is constructed, the automatically or manually supplied PAH-containing material that in FIG. 1 is shown schematically and provided with the reference numeral 11. The filling container 10 represents a feeding station in the terminology of the claims. Via a line 12, the PAH-containing material enters a rotary kiln 13, where it is thermally processed in a known manner. Via a further line 14 at the end of the rotary kiln 13, the thermally treated and now PAH-free material (inert material, which bears the reference numeral 15) ejected and transported away for reuse.

The trailer 7 of the second module 3 carries a cyclone 16, via a flexible pipe or hose connection 17, the flue gases from the rotary kiln 13 of the first module 2 are supplied. The cyclone 16 is in FIG. 1 presented in his working position, in which he has a considerable height. It can be folded for transport about an axis 18 in an approximately horizontal position. The freed from residual solids in the cyclone 16 flue gases are supplied via a pipe 19 to a Nachbrenneinrichtung 20, in which any remaining unwanted organic components are burned. If necessary, the afterburner 20, similar to the cyclone 16, can be folded down when this is necessary for transport. The corresponding axis is not shown in FIG.

On the trailer 8 of the third module 4, a flue gas cooler 21 is constructed, to which the hot flue gases are supplied via a flexible tube or hose connection 22, which leave the afterburner 20 of the second module 3. In the flue gas cooler 21, the flue gases are produced by injecting water or with help a heat exchanger is cooled to a suitable low temperature and then via a line 23 of a filter device, in the illustrated embodiment, a fabric filter 24, respectively. The latter is also located on the trailer 8 of the third module 4. A suction fan 25 on the trailer 8 finally pulls the cooled flue gases from the fabric filter 24 and sets the entire flow upstream system components under negative pressure. The extracted from the suction fan 25 flue gases, which are now cleaned according to the requirements of the 17th BimSchV a (public regulation in Germany), can be discharged through a chimney 26 in the outside atmosphere.

The third module 5 of the system 1 comprises, supported by its trailer 9, all those components which are required to supply the process-active components on the three modules 2, 3, 4. This is especially true for components that are required for power, such as a generator 27, which is essential in particular at construction sites that are far away from the public power supply. Of course, in addition a connection option for the network can be present. Other tanks 27, 28, 29, 30 contain auxiliary media, such as. As air, gas, water or diesel fuel.

The operation of the plant 1 described is as follows:

If road work involves large amounts of PAH-containing road break-up, this is not transported by truck to a more or less remote stationary facility. Instead, the in FIG. 1 shown plant 1 with the help of four, each a module 2, 3, 4, 5 carrying low loaders spent at the site. Of course, first, the connections between the individual modules, in particular the flexible pipe or hose connections 17, 22 and the electrical connections, solved. The various modules 2, 3, 4, 5 are then placed on site, the arrangement largely taking place in accordance with the available spatial conditions.

The system 1 is made ready by the various compounds, in particular the flexible pipe or hose connections 17, 22 and the electrical connections are made. Then, the operation can begin in principle the same way as in the DE 10 2009 025 361 B4 is described. One difference, however, is that it dispenses with the generation of heat from the resulting flue gases and instead the flue gases are cooled while losing the corresponding heat. This is simply due to the fact that there are generally no customers for this heat on site at the construction site.

However, as shown by dashed lines in the drawing, the heat stuck in the flue gases of the rotary kiln 13 and / or the afterburner 20 may be used to preheat the oxidizing air. This can be done for example with the aid of the flue gas cooler 21, the fresh air for this purpose air is supplied, which is supplied after heating with cooling of the flue gases to the rotary kiln 13 and / or the post-combustion device 20.

When the construction site along a repaired Road progresses, the mobile plant 1 can follow this site, so that the transport routes are always very short.

In FIG. 2 is a plant for the thermal treatment of PAH-containing roadbreak shown, the only difference is that it is not intended for the exclusive road transport on low loaders but possibly also for transport by train or ship or other trucks. For this purpose, the trailer 6, 7, 8 are replaced by platforms 106, 107, 108, which are each on four legs and which may also be accommodated in containers. Incidentally, the plant corresponds to the FIG. 2 in the function and structure of the individual modules and the connections between them and those of Annex 1 of the FIG. 1 , Corresponding parts are therefore in FIG. 2 denoted by the same reference numeral plus 100.

Claims (4)

1. Method for operation of a system for thermal preparation of reclaimed road material containing PAHs, or of oil sludges, which comprises following system components:

   a) a loading station (10; 110) for pre-comminuted reclaimed road material or oil sludges (11; 111);

   b) a rotary tube kiln (13; 113) in which the reclaimed road material (11; 111) or the oil sludges are burned, while oxidation air is fed in;

   c) a dust separator (16; 116) to which the flue gases produced in the rotary tube kiln (13; 113) are fed;

   d) an after-burning device (20; 120) to which the flue gases leaving the dust separator (16; 116) are fed;

   e) a filtering device (24; 124) to which the flue gases arising in the after-burning device (20; 120) are fed,
   characterized in that

   f) the system components (10, 13, 16, 20, 24; 110, 113, 116, 120, 124) according to the features a) to e) are divided into a plurality of modules (2, 3, 4; 102, 103, 104) each of which have a weight and dimensions, such that they may individually be transported using low loaders or trucks;

   g) the modules (2, 3, 4; 102, 103, 104) are positioned in spatial proximity to the point of origin of the reclaimed road material containing PAHs or of the oil sludges;

   h) the modules (2, 3, 4; 102, 103, 104) at least in part are connected to one another by pipes or hoses (17, 22; 117, 122) that are of a variable shape;

   i) after task completion at a first point of origin the modules (2, 3, 4; 102, 103, 104) are disconnected from each other and are transported to a next point of origin;
   wherein

   k) an additional module (5; 105) is used in which the components required to supply the other modules (2, 3, 4; 102, 103, 104), in particular a power unit (27; 127), tanks (28, 29, 30, 31; 128, 129, 130, 131) for operating media such as water, gas, compressed air, fuel, are grouped together.
2. Method according to claim 1, characterized in that the system components (10, 13, 16, 20, 24; 110, 113, 116, 120, 124) according to the features a) to e) are divided into four modules (2, 3, 4, 5; ,102, 103, 104, 105).
3. Method according to one of the preceding claims, characterized in that a flue gas cooler (21; 121) is arranged between the after-burning device (20; 120) and the filtering device (24; 124).
4. Method according to one of the preceding claims, characterized in that the heat in the flue gases from the rotary tube kiln (13; 113) and/or the after-burning device (20; 120) is used at least in part for pre-heating the oxidation air, which is fed to the rotary tube kiln (13; 113) and/or the after-burning device (20; 120).

Images