阅读说明：本技术 用于输送cng或lng燃料的输送系统 (A conveying system for carrying CNG or LNG fuel ) 是由 M.比佩斯 M.韦斯纳 于 2019-06-04 设计创作，主要内容包括：本发明涉及一种用于输送CNG或LNG燃料的输送系统,具体而言涉及一种用于将CNG或LNG燃料(2)从燃料箱(3)输送至转换装置(4)的输送系统(1),其中,输送系统(1)至少具有管路(5)、加热设备(6)和气压调节器(7),其中,管路(5)可经由第一端部(8)与燃料箱(3)相连接且经由第二端部(9)与气压调节器(7)相连接；其中,至少管路(5)可经由加热设备(6)加热。(The invention relates to a delivery system for delivering CNG or LNG fuel, in particular a delivery system (1) for delivering CNG or LNG fuel (2) from a fuel tank (3) to a conversion device (4), wherein the delivery system (1) has at least a line (5), a heating device (6) and a gas pressure regulator (7), wherein the line (5) is connectable to the fuel tank (3) via a first end (8) and to the gas pressure regulator (7) via a second end (9); wherein at least the line (5) can be heated via a heating device (6).)

1. A delivery system (1) for delivering CNG or LNG fuel (2) from a fuel tank (3) to a conversion device (4), wherein the delivery system (1) has at least a line (5), a heating device (6) and a gas pressure regulator (7), wherein the line (5) is connectable with the fuel tank (3) via a first end (8) and with the gas pressure regulator (7) via a second end (9); wherein at least the line (5) is heatable via the heating device (6).

2. The delivery system (1) according to claim 1, wherein the heating device (6) comprises at least a heating source (10) and a first chamber (11) in which a first heat transfer medium (12) is arranged; wherein the heating of the line (5) is effected by the heating source (10) at least via the first heat transfer medium (12).

3. The delivery system (1) according to claim 2, wherein the heating device (6) comprises at least a second chamber (13) in which a second heat transfer medium (14) is arranged; wherein the heating of the line (5) is effected by the heating source (10) first via the second heat transfer medium (14) and then at least via the first heat transfer medium (12).

4. The delivery system (1) according to any one of the preceding patent claims 2 and 3, wherein the heating comprises at least a phase change of at least the first heat transfer medium (12).

5. The delivery system (1) according to claim 4, wherein the first heat transfer medium (12) changes at least partially from a liquid state to a gaseous state after warming up, and the pipeline (5) is heatable by condensation of the first heat transfer medium (12).

6. The delivery system (1) according to any one of the preceding patent claims 2 to 5, wherein the line (5) is directly acted upon by the first heat transfer medium (12).

7. The delivery system (1) according to any one of the preceding patent claims, wherein the heating device (6) comprises at least an electric heating source (10).

8. The delivery system (1) according to any of the preceding patent claims, wherein the heating device (6) comprises an exhaust gas (15) as heating source (10), wherein the exhaust gas (15) is formed by combustion of the CNG or LNG fuel (2).

9. A conversion plant (4) comprising at least a transport system (1) according to any of the preceding patent claims and a waste gas line (16) downstream of the conversion plant (4) for leading out CNG or LNG fuel (2) converted in the conversion plant (4).

10. The conversion installation (4) according to claim 9, wherein the heating device (6) comprises an exhaust gas (15) as a heating source (10), wherein the exhaust gas (15) is formed by combustion of the CNG or LNG fuel (2) in the conversion installation (4); wherein the exhaust gas (15) is available as a heating source (10) downstream or upstream of the exhaust gas aftertreatment device (17).

11. The changeover device (4) according to claim 10, wherein exhaust gases (15) used as the heating source (10) can be conducted to the heating apparatus (5) via a bypass (18) of the exhaust gas line (16); wherein the bypass (18) is adjustable with respect to the volume flow of the exhaust gas (15) via an adjusting device (19).

Technical Field

The present invention relates to a delivery system for delivering CNG or LNG fuel from a fuel tank to a conversion device (e.g. an internal combustion engine) or a heating device. The conveying system can be used in particular in mobile systems, for example in motor vehicles. The delivery system may also be used in stationary systems, for example for delivering fuel to a heating device, in which the fuel is converted by combustion for generating heat.

Background

In the case of gas vehicles which are operated with CNG ("compressed natural gas") or LNG ("liquefied natural gas"), cold starts, for example, are critical, in particular at high loads, since after a few meters the gas pressure regulator or other components, such as, for example, the injectors, may already freeze and thus can stall the vehicle.

It is known that air pressure regulators can be integrated into the water circuit of a motor vehicle. This solution has however proven to be too sluggish, that is to say that the heat transfer may not be achieved just fast enough in the case of a cold start, so that icing may additionally occur.

Alternatively, a parking heating device may be used for heating, which however should be put into use sufficiently early due to the thermal inertia of the system. The shut-down heating device then requires a prior use schedule and usually consumes a lot of fuel.

Furthermore, a bivalent fuel system can be maintained in which a cold start and a cold start with gasoline are effected and only thereafter adjusted to CNG or LNG fuel.

Disclosure of Invention

The object of the present invention is to at least partially solve the problems posed with regard to the prior art. Particularly advantageous heating should be proposed in the case of transport systems for transporting CNG or LNG fuels.

A conveying system with the features according to patent claim 1 contributes to this task. Advantageous developments are the subject matter of the dependent patent claims. The features mentioned individually in the patent claims can be combined with one another in a technically meaningful manner and can be supplemented by facts from the description and/or details from the drawings, in which further embodiments of the invention are indicated.

Delivery systems for delivering CNG or LNG fuel from a fuel tank to a conversion device, such as an internal combustion engine, are proposed. The delivery system has at least one line, a heating device and a gas pressure regulator, wherein the line is connectable to the fuel tank via a first end and to the gas pressure regulator via a second end. At least the pipe (possibly additionally the gas pressure regulator) can be heated via a heating device.

It is then proposed, in particular, to heat a line for CNG or LNG fuel which runs between the fuel tank and the gas pressure regulator. The CNG or LNG fuel thus has sufficient temperature before being let down via the gas pressure regulator, so that ice formation can be excluded.

The heating device comprises in particular at least a heating source and a first chamber in which a first heat transfer medium is arranged. The heating of the line is effected by a heating source and at least via a first heat transfer medium.

The heating source is mainly a heat source. The temperature increase of the CNG or LNG fuel is then achieved by heat conduction and/or heat transfer from a heating source. Here, the heating source may generate heat, for example, by combustion of CNG or LNG fuel or by resistance heating or use the heat thus generated.

Starting from the heating source, the heating of the line is in particular always effected at least via the first heat transfer medium. The heat transfer medium may be a solid, liquid or gaseous medium. The first heat transfer medium has in particular a different raw material, a different material or a different composition than the first chamber.

The line extends in particular through the first chamber and is preferably acted upon in particular directly (beaufschlagen, sometimes referred to as loading) within the first chamber by means of the first heat transfer medium.

it is also possible that the line is arranged with a heat-conducting connection to the first chamber, and that the wall of the first chamber forms a heat-conducting connection between the line and the first heat transfer medium.

In particular, the line is arranged in particular gas-tight with respect to the first chamber or with respect to the first heat transfer medium.

According to a further embodiment, the heating device comprises at least a second chamber in which a second heat transfer medium is arranged. The heating of the line is effected by the heating source firstly via the second heat transfer medium and then at least via the first heat transfer medium.

In particular, national or regional legislation can be taken into account in such a way that it specifies, for example, a minimum spacing between the heating source and the pipe guiding the fuel, or in which a certain temperature of, for example, the first heat transfer medium contacting the pipe is not allowed to be exceeded.

The heating comprises in particular at least a phase change of at least the first heat transfer medium (and if possible also the second heat transfer medium).

It is particularly proposed that at least the first heat transfer medium has a phase change from solid to liquid, from solid to gas and preferably from liquid to gas during heating by the heating source and for the heating line.

In particular, the first heat transfer medium at least partially changes from a liquid state to a gaseous state after warming up, and the circuit may be heated by condensation (sometimes referred to as liquefaction) of the first heat transfer medium.

The line may in particular be acted upon directly by the first heat transfer medium or the line extends through the first chamber, so that the first heat transfer medium directly contacts the line.

The phase transition from liquid to gas is advantageous. Here, the cold first heat transfer medium may become hot at the bottom of the first chamber (downwards with respect to the direction of gravity) and gradually evaporate. The gaseous first heat transfer medium can rise in the first chamber and condense at the cover of the first chamber (in a thermally conductive connection with the line) or directly at the line and drip back again to the bottom.

Due to the condensation process, a very high heat exchange can be achieved compared to liquid-liquid or gaseous-gaseous embodiments of the first heat transfer medium (i.e. without phase change). Furthermore, the amount of the first heat transfer medium can be significantly reduced compared to liquid-liquid embodiments, in particular by a computationally easily ascertainable amount of the liquid to be evaporated.

In particular, only the evaporated first heat transfer medium contacts the tubes, so that the largest possible area of the tubes can be used for condensation of the first heat transfer medium.

This embodiment is particularly equally applicable to the second heat transfer medium. In this case, the second heat transfer medium condenses at the cover of the second chamber, which is arranged in a thermally conductive connection to the first chamber.

The heating device comprises in particular at least an electric heating source, or the heating source generates heat by resistance heating.

Alternatively or additionally, the heating device may comprise exhaust gas as the heating source. The exhaust gas is formed by combustion of, inter alia, CNG or LNG fuel. The combustion of CNG or LNG fuels is effected in particular only in internal combustion engines, the exhaust gases being conducted away from the internal combustion engine to the surroundings. Alternatively, the additionally generated exhaust gas may also be used as the heating source. The heat of the exhaust gas may be used as the heating source.

Furthermore, a conversion device, for example an internal combustion engine, is proposed, comprising at least the delivery system and an exhaust gas line downstream of the conversion device for conducting away CNG or LNG fuel converted (into exhaust gas) in the conversion device.

The heating device comprises in particular an exhaust gas as heating source, wherein the exhaust gas is formed by combustion of CNG or LNG fuel in the conversion means. The exhaust gas can be obtained in particular downstream or upstream of the exhaust gas aftertreatment device as a heating source. In this case, it is particularly conceivable that heat is extracted from the exhaust gas downstream of the exhaust gas aftertreatment device, so that an early and effective exhaust gas treatment is achieved by the exhaust gas aftertreatment device.

The exhaust gases used as the heating source can be led to the heating device, in particular, via a bypass of the exhaust gas line.

The bypass can be regulated in terms of the volumetric flow of the exhaust gas via a regulating device (for example via a valve).

Furthermore, a motor vehicle with the internal combustion engine (as a conversion device) is proposed. Internal combustion engines are used to drive motor vehicles.

Embodiments relating to a conveying system can be transferred in particular to conversion devices and motor vehicles and vice versa.

It should be pointed out in advance that the terms "first", "second" … … are used here first of all (only) to distinguish a plurality of objects, dimensions, or processes of the same type, i.e. the relevance and/or the order of these objects, dimensions, or processes is not mandatory in particular. If dependency and/or order is necessary, it is expressly stated herein or otherwise obvious to one of ordinary skill in the art upon studying the specifically stated design.

Drawings

The invention and the technical field are explained in more detail below with reference to the drawings. It should be noted that the present invention should not be limited by the proposed embodiments. In particular, it is also possible to extract partial aspects of the facts stated in the drawings and to combine them with other components and knowledge from the present description, as long as they are not explicitly shown otherwise. It should be noted in particular that the drawings and the dimensional ratios shown in particular are purely schematic. Wherein:

Fig. 1 shows a switching device with a conveying system in a first embodiment variant;

Fig. 2 shows a switching device with a conveying system in a second embodiment variant;

Fig. 3 shows a changeover device with a conveying system in a third embodiment variant;

Fig. 4 shows a changeover device with a conveying system in a fourth embodiment variant;

Figure 5 shows a part of a heating device with a first chamber;

Fig. 6 shows a part of another heating device with a first chamber and a second chamber.

List of reference numerals

1 conveying system

2 fuel

3 Fuel tank

4 switching device

5 pipeline

6 heating device

7 air pressure regulator

8 first end part

9 second end portion

10 heating source

11 first chamber

12 first heat transfer medium

13 second chamber

14 second heat transfer medium

15 exhaust gas

16 waste gas line

17 exhaust gas post-treatment equipment

18 bypass

19 adjustment device

20 bottom

21 a cover part.

Detailed Description

Fig. 1 shows a first embodiment variant of a changeover device 4 with a conveying system 1. Fig. 2 shows an internal combustion engine 4 with a delivery system 1 in a second embodiment variant. Fig. 3 shows a third embodiment variant of a changeover device 4 with a conveying system 1. Fig. 4 shows a fourth embodiment variant of a changeover device 4 with a conveyor system 1. Fig. 1 to 4 are next generally explained.

The conversion device 4 (internal combustion engine) comprises a delivery system 1 and an exhaust gas line 16 downstream of the conversion device 4 for conducting out exhaust gases 15 generated in the conversion device 4.

Here, the heating device 6 comprises an exhaust gas 15 as heating source 10, wherein the exhaust gas 15 is formed by combustion of CNG or LNG fuel 2 in the conversion means 4. The exhaust gas 15 may be captured as the heating source 10 downstream (fig. 1) or upstream (fig. 2 and 4), or both downstream and upstream (fig. 3) of the exhaust gas after-treatment device 17.

the exhaust gas 15 used as the heating source 10 may be led to the heating device 6 via a bypass 18 of an exhaust gas line 16.

The bypass 18 can be regulated in terms of the volumetric flow of the exhaust gas 15 via a regulating device, for example via a valve (fig. 4).

The delivery system 1 has a line 5, a heating device 6 and a gas pressure regulator 7, wherein the line 5 is connected to the fuel tank 3 via a first end 8 and to the gas pressure regulator 7 via a second end 9. The line 5 can be heated via a heating device 6.

The heating device 6 comprises a heating source 10 and a first chamber 11 in which a first heat transfer medium 12 is arranged. The heating of the pipe 5 is effected by a heating source 10 and at least via a first heat transfer medium 12.

Fig. 5 shows a part of the heating device 6 with the first chamber 11. The pipe 5 extends through the first chamber 11 and is acted upon directly inside the first chamber 11 by the first heat transfer medium 12. The line 5 is arranged or embodied gas-tightly with respect to the first chamber 11 and with respect to the first heat transfer medium 12.

The first heat transfer medium 12 has a phase change from liquid to gas during heating by the heating source 10 and for heating the line 5. The line 5 may be heated by condensation of the first heat transfer medium 12.

The pipe 5 is acted upon directly by the first heat transfer medium 12, since the pipe 5 extends through the first chamber 11.

The cold first heat transfer medium 12 heats up and gradually evaporates in the area of the bottom 20 (downwards with respect to the direction of gravity) of the first chamber 11. The gaseous first heat transfer medium 12 can rise in the first chamber 11 and condense directly at the line 5 and drip back again to the bottom 20.

only the evaporated first heat transfer medium 12 contacts the tubes 5, so that the largest possible area of the tubes 5 can be used for condensation of the first heat transfer medium 12.

fig. 6 shows a part of a further heating device 6 with a first chamber 11 and a second chamber 13. The pipe 5 is arranged here in a heat-conducting connection to the first chamber 11, and the wall (cover 21) of the first chamber 11 forms a heat-conducting connection between the pipe 5 and the first heat transfer medium 12.

The heating device 6 additionally comprises a second chamber 13 in which a second heat transfer medium 14 is arranged. The heating of the line 5 is effected by a heating source 10 firstly via a second heat transfer medium 14 and then at least via a first heat transfer medium 12.