Tank container arrangement with nested tank chambers

Abstract

Portable, freestanding tank container arrangement (1; 2; 3) for the delivery and on-site withdrawal of fuel, comprising: - a first, closed tank chamber (10) for fuel, - a separate, second enclosed tank chamber (12; 112; 212), - a common support structure (26) for supporting the tank container arrangement (1; 2; 3) during transport of the tank container arrangement (1; 2; 3), and - separate lockable filling openings (48) and separate withdrawal openings of the two tank chambers (10, 12; 112; 212), wherein the volume of the first tank chamber (10) is at least a multiple of the volume of the second tank chamber (12; 112; 212) and wherein the tank arrangement (1; 2; 3) has at least one dispensing device (32, 34) with pump (38) and dispensing nozzle (36), characterized by the fact that the second tank chamber (12; 112; 212) is arranged in the first tank chamber (10).

Description

[0001] The invention relates to a transportable, freestanding tank container arrangement with a closed tank chamber for flammable liquids, in particular a tank chamber for diesel fuel, and a further closed tank chamber for liquids, in particular a tank chamber for additives for a fuel or a commercial vehicle.

[0002] Transportable tank assemblies for fuels or additives are known, for example, as Intermediate Bulk Containers (IBCs) for the transport and storage of liquid fuels. They can be, for example, cuboid or round. Transportable fuel tanks with a dispensing device are also known, which are used, for example, for refueling or adding additives to commercial vehicles at their place of use.

[0003] EP 1 460 031 A1 discloses a forklift-transportable dispensing pump for a urea solution with an integrated urea solution container, a pump, and a dispensing nozzle. WO 2011 / 024191 A2 discloses a mobile tank system with separate tank chambers for fuels and additives, wherein the liquids are mixed together via mixing valves and corresponding pumps before dispensing via a dispensing nozzle. DE 10 2012 112 241 C9 discloses a mobile tank system with separate tank chambers for fuels and a urea solution, which can be dispensed independently of each other using separate pumps and dispensing nozzles.

[0004] Particularly when using a urea solution such as a 32.5% urea solution as an additive for a commercial vehicle, the use of such a tank arrangement at low ambient temperatures is difficult and subject to limitations, as the urea solution begins to crystallize at temperatures below -11.5°C.

[0005] To prevent this process, the prior art uses, for example, a dedicated heated housing around the additive tank chamber (see EP 1 460 031 A1). This is disadvantageous for a tank arrangement with a first tank chamber for fuels and a second tank chamber for additives; particularly when dimensioned as an IBC, the additional features reduce the available volume of the tank chambers.

[0006] It is therefore an object of the invention to create an improved transportable tank container arrangement, in particular with improved functionality at low ambient temperatures.

[0007] The problem is solved according to the invention by a tank container arrangement according to claim 1. Further preferred embodiments of the invention are solved by the dependent claims.

[0008] The invention comprises a transportable, freestanding tank container arrangement for the delivery and on-site withdrawal of fuel, comprising a first, closed tank chamber for fuel, a (separate) second closed tank chamber, a common support structure for supporting the tank container arrangement during transport of the tank container arrangement, and separate lockable filling openings and separate withdrawal openings of the two tank chambers, wherein the volume of the first tank chamber is at least a multiple of the volume of the second tank chamber and wherein the tank container arrangement has at least one dispensing device with pump and dispensing nozzle, characterized in that the second tank chamber is arranged in the first tank chamber.

[0009] Preferably, the second tank chamber is located partially or completely within the first tank chamber. The shared support structure allows for easy handling of two different liquids in separate tank chambers during transport, and enables the provision of different liquids that are frequently needed together. By arranging the second tank chamber within the first, the first tank chamber serves as thermal insulation for the second. This is particularly advantageous when the second tank chamber is positioned within the first in such a way that it is at least partially surrounded by the liquid in the first tank chamber. In this case, not only the wall of the first tank chamber but also the fuel it contains provides insulation for the second tank chamber.Preferably, the second tank chamber is arranged in the first tank chamber in such a way that it is still surrounded by the fuel contained in the first tank chamber even when the first tank chamber is partially emptied.

[0010] Preferably, the first tank chamber is for diesel fuel and the second tank chamber is for an aqueous urea solution. In particular, the second tank chamber can be for a 32.5% urea solution for exhaust aftertreatment in a suitable catalyst. Such a urea solution is AUS 32 according to ISO 22241 and is known, for example, under the brand name AdBlue®. This allows easy access to the urea solution when refueling commercial vehicles with diesel fuel. Thus, the shared support structure simplifies the supply of diesel fuel and urea solution to a commercial vehicle. For example, the tank arrangement forms a transportable tank system for the delivery of fuel and additives and for refueling commercial vehicles or machinery on site.

[0011] The diesel fuel in the first tank chamber acts as insulation for the urea solution. If the ambient temperature of the tank assembly drops, the diesel fuel buffers this temperature change, and the temperature in the second tank chamber decreases more slowly. This delays or prevents precipitation of the urea solution. As a result, the urea solution remains fully or largely available for refueling a vehicle with selective catalytic reduction (SCR) exhaust aftertreatment.

[0012] If, for example, the second tank chamber is a tank chamber for diesel fuel additives, these are also insulated or buffered by the first tank chamber and the liquid contained in the chamber, and an unwanted change in the properties is successfully prevented.

[0013] According to a preferred embodiment of the invention, the tank assembly further comprises a heating device for heating at least one of the tank chambers. The heating device can, for example, comprise at least one heating element, such as a heating mat and / or a heating rod. The heating element can, for example, be an electric heating element. The heating element can, for example, form at least one loop. Such a heating device can, for example, be electrically operated and further comprises, for example, a connection that is accessible from the outside of the tank assembly. By means of such a heater, the first tank chamber and / or the second tank chamber can be heated in such a way that the fuel in the first tank chamber and the liquid in the second tank chamber exhibit the desired properties even at very low temperatures.The heating of the first and / or second tank chamber can take place directly or indirectly.

[0014] The tank system also includes, for example, a temperature sensor. This sensor is designed to automatically switch the heating device on and / or off depending on the preset target temperature, thereby regulating the temperature in the first and / or second tank chamber. The temperature sensor can be located, for example, in the first or second tank chamber, or outside the tank chambers. This ensures that the liquids contained in the tank system maintain a predetermined temperature or temperature range.

[0015] According to a preferred embodiment of the invention, the heating device is configured to heat the first tank chamber. For example, the heating device is configured to heat the first tank chamber directly.

[0016] According to a preferred embodiment of the invention, at least one heating element of the heating device is arranged in the first tank chamber.

[0017] These embodiments simplify the design of the tank arrangement, as only one heating device is required for both tank chambers. The fuel in the first tank chamber is preferably heated to a temperature corresponding to the minimum operating temperature of the liquid in the second tank chamber. If this liquid contains, for example, a urea solution, the fuel in the first tank chamber is heated to a temperature of at least -11 °C. This ensures that the temperature of the urea solution in the second tank chamber is also at least -11 °C, thus effectively preventing crystallization of the urea solution. Simultaneously, this ensures that the fuel in the first tank chamber remains above its minimum operating temperature.Furthermore, the fuel is generally less corrosive than a urea solution, so the heating element located in the first tank chamber is not attacked by the urea solution and therefore does not need to be made of stainless steel, for example.

[0018] According to a preferred embodiment of the invention, the second tank chamber is arranged in the first tank chamber such that the second tank chamber abuts only one wall or only two opposite walls of the first tank chamber, for example only a lower wall or only a lower and an upper wall.

[0019] This embodiment allows the second tank chamber to be surrounded as completely as possible by the liquid contained in the first tank chamber, without complicating the mounting of the second tank chamber within the first. For example, the second tank chamber can be attached to the wall of the first tank chamber or to a mounting connected to that wall. It is also possible, of course, for the second tank chamber to be arranged within the first tank chamber in such a way that none of its sides directly abut any side wall of the first tank chamber, but rather only to dedicated mountings. One wall of the first tank chamber against which the second tank chamber abuts could, for example, be the floor of the first tank chamber, and a wall opposite this could, for example, be the top (ceiling) of the first tank chamber.Furthermore, for example, the second tank chamber can be located in the middle of the bottom of the first tank chamber.

[0020] According to a preferred embodiment of the invention, the second tank chamber is arranged within the first tank chamber such that it extends at least partially between two opposing walls of the first tank chamber and rests only against these walls. The second tank chamber can, for example, have its filling and dispensing openings in the area that rests against a wall of the first tank chamber. Furthermore, for example, the first tank chamber can have at least one opening in this area, such that the second tank chamber, or at least its filling and dispensing openings, is accessible through this opening. Alternatively, for example, the second tank chamber can rest against the wall of the first tank chamber only at the edges of such an opening; in this case, it is advantageous if it thereby creates a liquid-tight seal with the first tank chamber.Another conceivable embodiment involves the second tank chamber extending partially out of the wall it abuts through an opening in the wall. Even in this configuration, the second tank chamber would only contact the wall of the first tank chamber at the edges of the opening.

[0021] These exemplary embodiments have the advantage that the second tank chamber can have the greatest possible distance from the walls of the first tank chamber on the sides where it does not abut the first. This allows the liquid volume between the walls of the first and second tank chambers to be as large as possible, thus improving insulation and the buffering effect. The placement at the bottom of the first tank chamber ensures that the second tank chamber, or rather the liquid volume within it, remains insulated from the fuel in the first tank chamber even when the latter is partially emptied.This is particularly advantageous when the second tank compartment is emptied in conjunction with the first; that is, when a volume of liquid is removed from the first tank compartment, an equal volume of liquid is removed from the second tank compartment relative to its total volume. This ensures that the levels in the first and second tank compartments drop uniformly, and the liquid in the second tank compartment remains surrounded by the liquid in the first.

[0022] According to a preferred embodiment of the invention, the second tank chamber extends substantially between a lower wall and an upper wall of the first tank chamber. Preferably, the first tank chamber, with a substantially uniform cross-section, extends between a lower wall and an upper wall (ceiling, top) of the first tank chamber. For example, the second tank chamber can be substantially cuboid or cylindrical. For example, the first tank chamber can be cuboid.

[0023] Preferably, the floor area of ​​the second tank chamber corresponds to 6-15% of the floor area of ​​the first tank chamber. In other words, the floor area of ​​the second tank chamber corresponds to 6 / 100 to 15 / 100 of the floor area of ​​the first tank chamber. For example, the floor area of ​​the second tank chamber corresponds to 8% or 8 / 100 of the floor area of ​​the first tank chamber. More preferably, the volume of the second tank chamber corresponds to 6-15% of the remaining volume of the first tank chamber, where the remaining volume of the first tank chamber refers to the volume of the total volume not occupied by the second tank chamber. For example, the volume of the second tank chamber can correspond to 8% of the remaining volume of the first tank chamber.

[0024] According to a further preferred embodiment of the invention, the second tank chamber is surrounded by the (free) interior space of the first tank chamber over the majority of its height, i.e., by the interior space of the first tank chamber corresponding to the remaining volume. Preferably, the second tank chamber is surrounded by the (free) interior space of the first tank chamber over its entire height. The height of the second tank chamber refers to its vertical extent, i.e., the direction that is vertical during normal transport or use of the tank arrangement. The free interior space of the first tank chamber refers to the space extending between the walls of the first tank chamber. Figuratively speaking, there is therefore a gap between the second tank chamber and the walls of the first tank chamber over the majority of its height.

[0025] According to a preferred embodiment of the invention, the first tank chamber is at least partially made of metal. Preferably, the second tank chamber is made of plastic or of steel resistant to 32% aqueous urea solution (e.g., AUS 32), e.g., stainless steel. This gives the first tank chamber advantages with regard to its stability and mechanical resistance, and the second tank chamber is particularly resistant to corrosive liquids contained within it, such as an aqueous urea solution.

[0026] According to a further preferred embodiment of the invention, the first tank chamber is formed by a first tank container, and the tank container arrangement includes a protective wall which is firmly connected to the first tank container and forms a torsionally rigid supporting structure for the entire tank container arrangement.

[0027] For example, the first tank chamber is formed by the first tank container, and the second tank chamber is formed by a second tank container. The second tank container is at least partially located inside the first tank container.

[0028] According to a further preferred embodiment of the invention, the tank assembly comprises separate dispensing connections for the two tank chambers, and the tank assembly includes a dispensing device with a pump and nozzle for each of the two tank chambers. The dispensing connections are connected to the dispensing openings of the tank chambers, for example, via suitable pipes or hoses. Preferably, the pump of at least one of the dispensing devices is connected or connectable to a dispensing connection of an associated tank chamber. This embodiment is particularly advantageous if the second tank chamber contains an aqueous urea solution. Thus, both tank chambers can be accessed separately in a simple manner, allowing a vehicle to be refueled accordingly with fuel and a urea solution.In an embodiment where the second tank chamber contains an additive for the fuel in the first tank chamber, it is also conceivable, for example, that the tank arrangement includes a mixing valve which adds the additive to the fuel when it is dispensed. In this case, for example, only one dispensing port connected to the two dispensing openings is required, as well as only one dispensing device with pump and nozzle.

[0029] According to one embodiment of the invention, the first tank chamber and / or the tank container is single-walled or double-walled.

[0030] According to one embodiment of the invention, the filling and emptying openings of the two tank chambers are arranged in, on and / or above a ceiling of the first tank chamber.

[0031] According to one embodiment of the invention, the tank assembly comprises at least one compartment provided with a hinged cover, in which the extraction connections and / or the filling openings of the two tank chambers and / or the connection for the heating device are arranged. This particularly protects the connections or filling openings during transport of the tank assembly and prevents unauthorized access during storage. The compartment is preferably arranged above the ceiling of the first tank chamber.

[0032] According to one embodiment of the invention, the tank assembly comprises a base that is rigidly connected to the supporting structure and forms openings for the tines of a forklift. This can simplify transport of the tank assembly using a forklift. Furthermore, for example, the tank assembly includes retaining elements on its supporting structure, by means of which the tank assembly can be transported, for example, by means of a crane. Furthermore, for example, the retaining elements of the tank assembly also serve as retaining elements for another tank assembly of the same design arranged above it, thus making the tank assembly stackable.

[0033] According to one embodiment of the invention, the supporting structure comprises interconnected side walls of the tank container arrangement.

[0034] In the invention, the various embodiments can be combined with each other in any way, insofar as technically possible, and are not limited to their respective features.

[0035] Preferred embodiments are explained in more detail below with reference to the drawing. It shows: Fig. 1-3 schematic cross-sectional views of a transportable, cuboid tank container arrangement according to three embodiments of the invention; Fig. 4 a schematic side view of the tank arrangement in Fig. 1 to 3 with an open cover; and Fig. 5 a schematic top view of part of the tank arrangement in Fig. 3 below the cover.

[0036] Fig. Figure 1 shows a cross-sectional view of a cuboid, transportable, freestanding tank assembly 1 with a first closed tank chamber 10 for diesel fuel and a separate, second closed tank chamber 12 for a 32.5% aqueous urea solution. The volume of the second tank chamber 12 is approximately 8% of the volume of the first tank chamber 10. If, for example, approximately 8% of the diesel fuel is required for the selective catalytic reduction (SCR) of nitrogen oxides in diesel engine exhaust gases, the specified volume ratios ensure that, under normal circumstances, during refueling with diesel fuel and urea solution, the urea supply is not exhausted before the diesel supply.If the volume of the first tank chamber is several times the volume of the second tank chamber, this results in particularly good economic efficiency with regard to the required refilling processes and any residual quantities when transporting the tank arrangement to the filler.

[0037] The first tank chamber 10 is formed by a first tank container 14, which has an inner shell 16 and an outer shell 18, both made of steel. The inner shell 16 has a U-shaped cross-section, so that the tank container 14 is single-walled at the top and double-walled in the area of ​​the side walls and the bottom. Alternatively, the tank container 14 can also be single-walled or double-walled on all sides.

[0038] The second tank chamber 12 is formed by a second tank container 20, which is made, for example, of plastic, in particular polyethylene (PE), or of stainless steel. The second tank container 20 is arranged within the first tank container 14 such that it extends between the upper wall 11 or top (ceiling) and the lower wall 13 or bottom of the first tank container. In the present embodiment, the upper wall 11 is formed, for example, by the outer shell 18, and the lower wall 13 by the inner shell 16. The two tank chambers 10, 12 are formed by separate tank containers 14, 20, which are made of different materials. The second tank container 20 is arranged within the first tank container 14 such that the tank container 20 has a gap to the first tank container 14 on all sides that are not in contact with the walls 11 or 13.

[0039] Above the first tank 14, a compartment 22 is formed, which is laterally surrounded by a protective wall 24. The protective wall 24 is, for example, made of steel. The protective wall 24 and the side walls of the outer shell 18 of the first tank 14 form, for example, the predominant part of the lateral outer surfaces of the cuboid tank arrangement.

[0040] For example, the protective wall 24, together with the upper wall 11 of the second tank 14, forms a basin. The upper wall 11 is formed, for example, by the outer shell 18 of the first tank 14.

[0041] The protective wall 24 is rigidly connected to the first tank container 14 and together they form a torsionally rigid support structure 26 for the entire tank container assembly. The second tank container 20 is connected to the first tank container 14, for example, via brackets (not shown). A base 30 of the tank container assembly is rigidly connected to the support structure 26 and provides access openings for the tines of a forklift truck to facilitate transport of the tank container assembly using a forklift truck.

[0042] Compartment 22 contains dispensing devices 32 and 34 for urea solution and diesel fuel, respectively, each comprising a dispensing nozzle 36 and a pump 38. The respective dispensing nozzle 36 is connected to the respective pump 38 via a flexible supply line (as shown in...). Fig. 5, supply line shown with dashed lines). The dispensing device 32 is connected via a withdrawal port 40 to the withdrawal opening of the second tank chamber 12 and to a suction line 42 arranged in the tank chamber 12 (as in Fig. 5 (shown as dashed lines).

[0043] The dispensing device 34 is connected via a withdrawal port 44 to the withdrawal opening of the first tank chamber 10 and to a suction line in the form of a suction hose or suction pipe 46 arranged in the tank chamber 10 (as shown in Fig. 5 (shown as dashed lines).

[0044] The tank chambers 10 and 12 are also provided on their respective upper sides with filling openings 48 closed by means of lids, as shown in Fig. 1 and Fig. Figure 5 shows the first tank 14 having an opening in its upper wall 11, or the first tank chamber 10, through which the filling opening 48 of the second tank 20, or the second tank chamber 12, is accessible. The filling opening 48 of the first tank chamber 10 is connected to a filling pipe 55 that extends into the lower third of the first tank chamber 10.

[0045] A cover 50 of compartment 22 is formed by a hinged lid which is pivotally mounted on side hinges.

[0046] The tank assembly 1 further comprises a heating device 58. This is, for example, an electric heating device with a connection 60 for an external power source. The heating device 58 further comprises a temperature sensor for the ambient temperature on the heating device 58 and a temperature-controlled heating element 62. The heating element 62 is designed to heat the fuel in the first tank chamber 10. In the present embodiment, the heating element 62 is designed as a heating rod that heats the fuel in the first tank chamber 10. The heating element 62 can also be designed as a heating mat or similar. The heating device 58 is designed such that the connection 60 is arranged in the compartment 22.

[0047] Fig. Figure 2 shows an embodiment of the tank container arrangement 2, which is described in Fig. The embodiment shown in Figure 1 essentially corresponds to the embodiment shown. Similar features are accordingly numbered with the same reference numerals, and reference is made to the description in Figure 1. Fig. 1 referred.

[0048] In Fig. 2 The second tank chamber 112 is formed by a second tank container 120, which is arranged at the bottom 13 of the first tank container 14. In contrast to the one in Fig. In the embodiment shown in Figure 1, the second tank container 120 rests only against the bottom 13 of the first tank container 14 and preferably has a gap to the walls of the first tank container 14 on all other sides. The filling opening 48 of the second tank chamber 112 is connected to the second tank chamber 112 via a filling pipe 55. Fig. Figure 3 shows an embodiment of the tank container arrangement 3, which incorporates the in Fig. 1 and Fig. The embodiments shown in section 2 essentially correspond to the embodiments shown. Similar features are accordingly numbered with the same reference numerals, and reference is made to the description in section 2. Fig. 1 referred.

[0049] In Fig. 3 The second tank chamber 212 is formed by a second tank container 220, which extends from the bottom 13 of the first tank container 14 through its top 11 into compartment 22. In contrast to Fig. 1 The first tank container 14 or the first tank chamber 10 has an opening in the top 11 through which the second tank container 220 extends into the compartment 22.

[0050] Fig. Figure 4 shows a view of the tank container arrangement 1, 2, 3 on an end face of the tank container arrangement with the cover 50 opened. The cover 50 is supported by a holding device in the form of a gas spring 52.

[0051] Fig. Figures 1 to 4 show retaining elements 54 in the form of eyelets arranged at four upper corners of the tank container assembly. These eyelets are designed as crane eyes and can also serve for securing the tank during transport. They are firmly connected to the supporting structure 26.

[0052] The tank container arrangement 1, 2, 3 is stackable. The retaining elements 54 of one tank container arrangement simultaneously serve as retaining elements for gripping the base 30 of a tank container arrangement positioned above it. In the stacked state, this secures the tank container arrangements against lateral slippage.

[0053] Fig. Figure 5 schematically shows a view of compartment 22 below cover 50, as shown in Fig. 3. The dispensing ports 40, 44, the filling openings 48 of the two tank chambers, and the dispensing nozzles 36 and pumps 38 of the dispensing devices 32, 34 are arranged in the compartment 22 next to the second tank container 220 or the second tank chamber 212. This embodiment also corresponds to the one shown in Fig. 1 embodiment shown, wherein in this the opening 48 of the second tank container 20 is accessible from compartment 22 (see Fig. 1).

[0054] Optionally, holders 56 for the dispensing nozzles 36 are attached to the outer wall of the second tank chamber 12. The holders 56 form, for example, upwardly open pockets to accommodate one dispensing nozzle 36 each. The holders 56 are preferably made of steel. Furthermore, the upper section of the heating device 58, which includes the connection 60, is arranged in compartment 22.

[0055] The tank system is a transportable system for the on-site delivery and removal of flammable liquids, particularly diesel fuel. Optionally, the tank system is also suitable for the stationary storage of flammable liquids, particularly diesel fuel.

[0056] In contrast to the described embodiment, the second tank chamber 12 can also have a wall made of stainless steel or coated steel. For example, the second tank container 20 can have a plastic lining on the inside, for example made of polyethylene, and / or be coated with a corrosion-protective material.

[0057] Furthermore, the first tank chamber 10 can, for example, have a wall made of a different material, such as plastic, in particular polyethylene (PE). This wall can, for example, be a third, innermost wall of tank chamber 10.

[0058] The arrangement of the filling opening 48 and the withdrawal port 44 of the first tank chamber 10 or the first tank container 14, as well as the arrangement of the brackets 56, dispensing nozzles 36 and pumps 38, corresponds for all illustrated embodiments to the arrangement in Fig. 5.

[0059] The embodiments shown in the figures can of course be combined in any way with the embodiments described above, insofar as technically possible, and are not limited to their illustrated features. Reference figures 1 Tank container arrangement 2 Tank container arrangement 3 Tank container arrangement 10 first tank chamber 11 upper wall 12 second tank chamber 13 lower wall 14 first tank 16 inner jacket 18 Outer jacket 20 second tank 22-fold 24 Protective wall 26 Supporting structure 30 Stand base 32 Delivery facility 34 Dispensing facility 36 Fuel nozzle 38 Pump 40 Extraction port second tank chamber 42 Suction line second tank chamber 44 Extraction connection first tank chamber 46 Suction line first tank chamber 48 filling openings tank chambers 50 Coverage 52 Gas spring 54 retaining elements 55 filling pipes tank chambers 56 brackets 58 Heating device 60 connection 62 Heating element 112 second tank chamber 120 second tank 212 second tank chamber 220 second tank QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] EP 1 460 031 A1 [0003, 0005] WO 2011 / 024191 A2

[0003] DE 10 2012 112 241 C9

[0003]

Claims

[1] Transportable, freestanding tank container arrangement (1; 2; 3) for the delivery and on-site withdrawal of fuel, comprising: - a first, closed tank chamber (10) for fuel, - a separate, second enclosed tank chamber (12; 112; 212), - a common support structure (26) for supporting the tank container arrangement (1; 2; 3) during transport of the tank container arrangement (1; 2; 3), and - separate lockable filling openings (48) and separate withdrawal openings of the two tank chambers (10, 12; 112; 212), wherein the volume of the first tank chamber (10) is at least a multiple of the volume of the second tank chamber (12; 112; 212) and wherein the tank arrangement (1; 2; 3) has at least one dispensing device (32, 34) with pump (38) and dispensing nozzle (36), characterized by , that the second tank chamber (12; 112; 212) is arranged in the first tank chamber (10). [2] Tank container arrangement according to claim 1, wherein the first tank chamber (10) is a tank chamber for diesel fuel and the second tank chamber (12; 112; 212) is a tank chamber for an aqueous urea solution. [3] Tank container arrangement according to one of claims 1 or 2, wherein the tank container arrangement (1; 2; 3) further comprises a heating device (58) for heating at least one of the tank chambers (10, 12; 112; 212). [4] Tank container arrangement according to claim 3, wherein the heating device (58) is configured to heat the first tank chamber (10). [5] Tank container arrangement according to claim 3 or 4, wherein at least one heating element of the heating device (58) is arranged in the first tank chamber (10). [6] Tank container arrangement according to one of the preceding claims, wherein the second tank chamber (12; 112; 212) is arranged in the first tank chamber (10) such that the second tank chamber (12; 112; 212) abuts only one wall (13) or only two opposite walls (11, 13) of the first tank chamber (10). [7] Tank container arrangement according to one of the preceding claims, wherein the second tank chamber (12; 212) is arranged in the first tank chamber (10) such that it extends at least partially between two opposing walls (11, 13) of the first tank chamber (10) and is only in contact with these walls. [8] Tank container arrangement according to one of the preceding claims, wherein the second tank chamber (12; 212) extends substantially between a lower wall (13) and an upper wall (11) of the first tank chamber (10) and wherein the floor area of ​​the second tank chamber (12; 212) corresponds to 6-15% of the floor area of ​​the first tank chamber (10). [9] Tank container arrangement according to one of the preceding claims, wherein the second tank chamber (12; 112; 212) is surrounded by the interior of the first tank chamber (10) over the majority of its height. [10] Tank container arrangement according to one of the preceding claims, wherein the first tank chamber (10) is at least partially made of metal and the second tank chamber (12; 112; 212) is made of plastic or steel resistant to 32% aqueous urea solution. [11] Tank container arrangement according to one of the preceding claims, wherein the first tank chamber (10) is formed by a first tank container (14), and wherein the tank container arrangement (1; 2; 3) comprises a protective wall (24) which is rigidly connected to the first tank container (14) and forms a torsionally rigid support structure (26) for the entire tank container arrangement (1; 2; 3). [12] Tank container arrangement according to one of the preceding claims, wherein the tank container arrangement (1; 2; 3) comprises separate withdrawal connections (40, 44) of the two tank chambers (10, 12; 112; 212), and wherein the tank container arrangement (1; 2; 3) comprises a dispensing device (32, 34) with pump (38) and dispensing nozzle (36) for each of the two tank chambers (10, 12; 112; 212).

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