JP2023551664A - Ammonia storage system temperature control process - Google Patents

Abstract

- at least one start storage cartridge (8) of ammonia in adsorbed form in a start salt; - at least one main storage cartridge (10) of ammonia in an adsorbed form in a main salt; at least one main storage cartridge (10), the ammonia desorption temperature of which is higher than the ammonia desorption temperature of the main salt; - a heater (34) arranged to heat the starter cartridge; and - an ammonia consumption device. (6); - at least one heat transfer fluid circulation line arranged to provide heat exchange between the heat transfer fluid and each of the start cartridge (8), the main cartridge (10) and the device (6); (22); and - an ammonia circulation line (12) connecting a start cartridge (8), a main cartridge (10) and a device (6). ).

Description

The present invention relates to thermal management of ammonia storage systems on vehicles. More particularly, the present invention relates to a vehicle ammonia storage system and a thermal management process for the system.

Ammonia has several functions that can be performed on the vehicle of a motor vehicle. Particularly popular are energy carriers in fuel cells that operate directly with ammonia or with dihydrogen (in the latter case it is necessary to crack the ammonia before supplying it to the cell). It can be used as a. Furthermore, mention may also be made of the catalytic reduction of exhaust gas in heat engine vehicles.

In order to store ammonia on board a vehicle, it is known to store it in the form of a gas adsorbed or adsorbed on salt in storage cartridges. This is one of the safe storage methods for ammonia. In that case, ammonia must first be desorbed before it can be consumed. Patent Document 1 discloses an ammonia storage system in the preamble of claim 8. In the context of the description of the present invention, for brevity, the terms absorption and desorption will be used to refer to the storage and release of gaseous ammonia into and from the salt, respectively; if the storage is by absorption, then by adsorption. I will not question the origin of this.

Since the ammonia desorption reaction is endothermic, it is necessary to heat the storage cartridge to enable ammonia desorption. Therefore, when a vehicle needs to consume ammonia, it is known to heat the cartridge, such as by using a heat transfer fluid. Still, the inertia of heat transfer required for desorption of ammonia in the cartridge may prevent it from proceeding quickly enough, such as when the ammonia is used as a feed to a fuel cell when the vehicle is started. , which may adversely affect the operation of the vehicle.

EP2181963B1

The present invention aims inter alia to solve that problem by allowing rapid desorption of ammonia, in particular when starting the vehicle.

Therefore, the present invention provides a heat management process in a vehicle ammonia storage system, which system includes:
- at least one ammonia storage cartridge, referred to as a starter cartridge, of ammonia in salt-absorbed form, referred to as a starter salt;
- at least one ammonia storage cartridge, called main cartridge, in which the ammonia desorption temperature under a given pressure is higher for the starting salt, and a storage cartridge for ammonia in salt-absorbed form, called main salt; ,
- a heater arranged to heat the at least one starter cartridge to desorb ammonia stored in the starter salt;
- an ammonia consumption device such as a fuel cell;
- at least one heat transfer fluid circulation line arranged to perform heat transfer between the heat transfer fluid and each of the at least one start cartridge, the at least one main cartridge and the ammonia consumer;
- an ammonia circulation line connecting the at least one start cartridge, the at least one main cartridge and an ammonia consumption device, in the thermal management process:
- in a start configuration, activating a heater to heat the at least one start cartridge, restricting circulation of heat transfer fluid toward the at least one start cartridge, and circulating heat transfer fluid in a line to heat the at least one start cartridge; heating two main cartridges;
- in the feed configuration, the heater is stopped and the heat transfer fluid continues to be circulated in the line to heat the at least one main cartridge, so that ammonia can be circulated in the line towards the at least one starter cartridge; A thermal management process is contemplated in which steps are performed.

Therefore, the storage system includes at least one starter cartridge for supplying the consuming device by quickly heating the starter cartridge until the at least one main cartridge starts desorbing ammonia. Equipped with a starter cartridge equipped with a heater that allows quick removal of ammonia.

During the feeding configuration, a portion of the ammonia released from the at least one main cartridge serves to fill the at least one starting cartridge. In fact, when the heater is turned off, the at least one part of the at least one The temperature within the two start cartridges drops below the desorption temperature of the start salt when ready for feeding. The starting salt of the at least one starting cartridge can then absorb ammonia from the at least one main cartridge. Thereby, the at least one start cartridge is ready for the next start of the vehicle.

Meanwhile, during the feed configuration, the heat transfer fluid is configured to heat the at least one main cartridge and at the same time cool the at least one start cartridge, so that during the start configuration the heat transfer fluid The amount of heat imparted to the starting cartridge can be redistributed to the at least one main cartridge by means of a heat transfer fluid when ready for delivery. By doing so, the energy balance of the thermal management process is optimized.

Advantageously, the ammonia storage capacity of the at least one start cartridge is smaller than the ammonia storage capacity of the at least one main cartridge.

Therefore, the desorption of ammonia in the at least one start cartridge is accelerated accordingly.

Advantageously, the ammonia storage system further comprises a pressure sensor in the ammonia circulation line and switches from the start configuration to the supply configuration when the pressure sensor measures an ammonia pressure above a predetermined threshold, such as 2 bar or 3 bar. The transition will take place.

The attitude change can thus be driven by pressure sensor measurements and can be easily implemented.

Advantageously,
- in a supply peak regime, activating a heater to heat the at least one starter cartridge, restricting circulation of heat transfer fluid toward the at least one starter cartridge, and continuing to circulate heat transfer fluid through the line to heat the at least one starter cartridge; A step of heating the at least one main cartridge is further performed.

This allows the invention to cope with momentary peaks in ammonia consumption by the consumer. That is, the at least one starting cartridge acts both as a buffer for starting the vehicle and as a complementary ammonia tank that can release ammonia very quickly.

Advantageously, the heater comprises an induction heater.

This type of heater is suitable for quickly heating the at least one starter cartridge.

Advantageously, the starting salt comprises magnesium chloride or manganese chloride or a mixture of both.

Advantageously, the main salt comprises calcium chloride or strontium chloride or a mixture of both.

These salts have desorption temperatures well apart from each other so that the heat transfer fluid and their cartridges, whether cooling the at least one starter cartridge or heating the at least one main cartridge, It is possible to increase the efficiency of heat transfer between

According to one embodiment of the invention, during the feeding regime, the at least one starting cartridge is at a temperature between the ammonia desorption temperature of the main salt and the ammonia desorption temperature of the starting salt under a given pressure. Heat transfer fluid is further circulated to cool the at least one starter cartridge.

Thereby, the heat transfer fluid cools the at least one starter cartridge to enable the at least one starter cartridge to absorb ammonia for the next start or next consumption peak, and supplies the ammonia consumer to the at least one starter cartridge. Heating of the at least one main cartridge so as to allow ammonia to be desorbed can be performed at the same time in the delivery configuration. Therefore, the organization of the heat transfer in the storage system can be simplified, and thus the structure of the system, in particular the circulation lines of the heat transfer fluid, can be simplified. Furthermore, it can be seen that the thermal energy imparted to the at least one starting cartridge by the heater during the starting condition is not lost. This is because the thermal energy is utilized to reheat the heat transfer fluid during the dispensing configuration, which heat transfer fluid will in turn provide heating of the at least one main cartridge. In this way, the energy consumption of the storage system can be optimized.

According to another embodiment of the invention, the ammonia storage system comprises:
- a first heat transfer fluid circulation line arranged for heat transfer between the heat transfer fluid and the at least one starter cartridge;
- a second heat transfer fluid circulation line arranged to exchange heat between the heat transfer fluid and each of the at least one main cartridge and the ammonia consuming device;
The ammonia storage system is arranged to allow exchange of heat between the heat transfer fluid in the first line and the heat transfer fluid in the second line, preferably without intermixing of the heat transfer fluids in the two lines. It further includes a heat exchanger.

Therefore, the present invention allows separate thermal management of the at least one start cartridge and the at least one main cartridge while preventing loss of thermal energy by means of a heat exchanger. Furthermore, it can be seen that the thermal energy imparted to the at least one starting cartridge by the heater during the starting condition is not lost. This means that the thermal energy is utilized to reheat the heat transfer fluid in the first line during the delivery regime, which heat transfer fluid in turn heats the heat transfer fluid in the second line by the heat exchanger; This is because the at least one main cartridge will be heated indirectly. In this way, the energy consumption of the storage system can be optimized.

Advantageously, the process is performed on a vehicle.

In the present invention,
- at least one ammonia storage cartridge, referred to as a starter cartridge, of ammonia in salt-absorbed form, referred to as a starter salt;
- at least one ammonia storage cartridge, called main cartridge, in which the ammonia desorption temperature under a given pressure is higher for the starting salt, and a storage cartridge for ammonia in salt-absorbed form, called main salt; ,
- a heater arranged to heat the at least one starter cartridge to desorb ammonia stored in the starter salt;
- an ammonia consumption device;
- at least one heat transfer fluid circulation line arranged to perform heat transfer between the heat transfer fluid and each of the at least one start cartridge, the at least one main cartridge and the ammonia consumer;
- An ammonia storage system for a vehicle is also contemplated, comprising an ammonia circulation line connecting the at least one starter cartridge, the at least one main cartridge and an ammonia consumption device.

Advantageously, the storage system further comprises a control unit arranged to carry out a thermal management process as described above.

According to one embodiment of the invention, the heater comprises a pipe made of a conductive material, preferably a ferromagnetic material, the pipe comprising:
- heated by induction,
- configured to form a section of a heat transfer fluid circulation line;

Preferably, the outer part of the at least one starter cartridge forming the container or jacket of the at least one starter cartridge is made of a material, such as plastic, which is not subject to induction heating.

According to the present invention, a motor vehicle comprising an ammonia storage system as described above is also contemplated.

The invention will now be introduced through the following description, given by way of example only and with reference to the accompanying drawings, in which: FIG.

1 is a diagram showing a vehicle ammonia storage system according to a first embodiment of the present invention; FIG. 2 is an overall view on a larger scale of the starting cartridge of the ammonia storage system of FIG. 1; FIG. FIG. 3 is a diagram showing a vehicle ammonia storage system according to a second embodiment of the present invention.

FIG. 1 shows an ammonia storage system 2 for a vehicle 4 according to a first embodiment of the invention.

The ammonia storage system 2 comprises an ammonia consumption device 6. Ammonia consumption device 6 is a device of vehicle 4 that needs to be supplied with ammonia for operation. It can be an ammonia-type fuel cell or a hydrogen-type fuel cell with a cracking module configured to crack ammonia into a gas mixture comprising dihydrogen. It can also be a catalytic reduction device for vehicle exhaust gas. These various types of ammonia consuming devices are known and will not be described further.

The ammonia storage system 2 comprises at least one ammonia storage cartridge, referred to as a starter cartridge 8, of ammonia in salt-absorbed form, referred to as a starter salt. Although the ammonia storage system 2 here comprises only one starting cartridge 8, it can be envisaged that the ammonia storage system comprises a plurality of starting cartridges, such as two or more. The starter cartridge 8 allows storage of ammonia in gaseous form. For this purpose, the starting cartridge 8 is provided with a matrix containing a starting salt, into which the ammonia is absorbed. Here, the starting salt comprises magnesium chloride or manganese chloride, or a mixture of both.

The ammonia storage system 2 comprises at least one ammonia storage cartridge, called main cartridge 10, of ammonia in salt-absorbed form, called main salt. Although the ammonia storage system 2 here comprises two main cartridges 10, it can be envisaged that the ammonia storage system comprises a larger number of main cartridges. The main cartridge 10 allows storage of ammonia in gaseous form. Therefore, the main cartridges 10 each include a matrix containing a main salt, into which ammonia is absorbed. Here, the main salt comprises calcium chloride or strontium chloride, or a mixture of both. The starting salt has an ammonia desorption temperature T _d higher than the ammonia desorption temperature T _p of the main salt under a given pressure, such as 2 or 3 bar. The merits of this property will be discussed later.

The ammonia storage system 2 includes an ammonia circulation line 12 connecting a start cartridge 8, a main cartridge 10, and an ammonia consumption device 6. The ammonia circulation line 12 can lead the ammonia released from the starter cartridge 8 and the main cartridge 10 to the ammonia consumption device 6 .

The ammonia circulation line 12 is equipped with a quantitative metering unit 14 capable of metering the amount of ammonia delivered from the cartridges 8 , 10 towards the ammonia consumption device 6 . The ammonia circulation line 12 further includes a pressure sensor 16 that can measure the pressure of ammonia within the ammonia circulation line 12.

The ammonia circulation pipe 12 is provided with an on/off valve 18a configured to be electrically controllable at the ammonia outlet of the start cartridge 8. The on-off valve 18a can occupy an open position that allows the flow of ammonia in both directions through the valve, and a closed position that prevents the flow of ammonia in both directions through the valve.

The ammonia circulation line 12 includes a passive valve 20 at the ammonia outlet of each main cartridge 10. "Passive" means that the valve operates without being supplied with energy or controlled by equipment provided for that purpose. Each passive valve 20 is configured to prevent ammonia in the ammonia circulation line 12 from entering the main cartridge 10 to which it is connected. Each passive valve 20 is configured to allow ammonia in the main cartridge 10 to flow toward the ammonia circulation line 12 when the ammonia pressure in the main cartridge 10 to which it is connected is sufficiently high. be done.

Ammonia storage system 2 includes a heat transfer fluid circulation line 22 arranged to exchange heat between the heat transfer fluid and each of start cartridge 8 , main cartridge 10 and ammonia consumer 6 . In FIG. 1, the direction of circulation of the heat transfer fluid in the circulation line 22 is indicated by arrows.

Heat transfer fluid circulation line 22 has a four-way valve 24 defining four sections. The first section 26 corresponds to the heat transfer fluid outlet of the ammonia consumer 6 . The second section 28 corresponds to the heat transfer fluid inlet of the starter cartridge 8 . The third section 30 corresponds to the heat transfer fluid inlet of the main cartridge 10. The third section 30 includes an on/off valve 18b configured to be electrically controllable for each main cartridge 10. The third section 30 is also fed by the heat transfer fluid outlet of the starter cartridge 8 . The fourth section 32 corresponds to the heat transfer fluid inlet of the ammonia consumer 6. The fourth section 32 is further fed by a heat transfer fluid outlet of the main cartridge 10 .

FIG. 2 shows the arrangement of the starter cartridge 8 in the ammonia storage system 2. As shown in this figure, the ammonia storage system 2 includes a heater 34 configured to heat the starter cartridge 8 to desorb ammonia stored in the starter salt. Here, the heater 34 is an induction type heater. The heater comprises a pipe 36 made of a conductive material, here a ferromagnetic material, and connected to an alternating current power supply 38 . The pipe 36 is coiled around the starter cartridge 8. By heating the pipe 36 in a self-evident manner by induction heating, the starter cartridge 8 is also heated. The outer jacket of the starter cartridge 8 is made of plastic to prevent induction heating. Pipe 36 is connected to a source of cooling fluid configured to cool pipe 36 when induction heating is stopped.

According to one specific embodiment of the invention, the pipe 36 is connected to the heat transfer fluid circulation line 22 to form a section of the heat transfer fluid circulation line 22 . In that case, the pipe 36 forms an inductive heat source and also forms a heat exchanger as a section of the heat transfer fluid circulation line 22 . In other words, the heater 34 can not only apply heat to the start cartridge 8 but also absorb the heat of the start cartridge 8 . This helps reduce the number of components of the ammonia storage system 2, which also facilitates design and reduces manufacturing costs.

The ammonia storage system 2 comprises a control unit 40 configured to control the operation of each element of the ammonia storage system 2, in particular the operation of the metering unit 14, the on-off valves 18a, 18b and the heater 34.

The thermal management process of the ammonia storage system 2 carried out by the control unit 40 on the vehicle 4 will now be described.

It is assumed that the vehicle 4 is initially in a stopped state. When a vehicle is started, the process begins with a starting position.

In the start mode, the heater 34 is activated to heat the start cartridge 8 and the start salt that has absorbed ammonia. During this heating, the circulation of heat transfer fluid toward the starter cartridge 8 is restricted so that the starter cartridge 8 is not unnecessarily cooled. Upon heating, the starting salt reaches the ammonia desorption temperature T _d . Then, desorption of ammonia from the starting salt begins. In the starting condition, the on-off valve 18a is opened and the ammonia desorbed from the starting salt can thereby leave the starting cartridge 8 and be supplied to the ammonia circulation line 12. Ammonia is metered by quantitative metering unit 14 and provided to ammonia consumption device 6 .

During the start condition, on-off valve 18b is opened and heat transfer fluid is circulated into circulation line 22 to heat main cartridge 10. Initially, the temperature of the heat transfer fluid is low, but as the device 6 consumes the ammonia, it releases heat, which is absorbed by the heat transfer fluid and increases the temperature of the heat transfer fluid. Under this condition, the heat transfer fluid heats the main cartridge 10 more slowly than the heater 34 heats the starter cartridge 8, so that the ammonia is desorbed from the starter cartridge 8 first.

During the start condition, the heat transfer fluid continues to heat the main cartridge 10 and the main salt of the main cartridge 10 reaches its ammonia desorption temperature T _p . Then, desorption of ammonia from the starting salt begins. This desorbed ammonia exits the main cartridge 10 and is supplied to the ammonia circulation line 12 through the passive valve 20, thereby increasing the ammonia pressure within the ammonia circulation line 12.

During the start condition, the device 6 is supplied with ammonia primarily from the start cartridge 8 .

When the pressure sensor 16 measures an ammonia pressure above a predetermined threshold, such as 2 bar or 3 bar, a transition is made from the start configuration to the supply configuration.

During the feed configuration, heater 34 is turned off and heat transfer fluid is circulated towards starter cartridge 8 . The temperature T _f of the heat transfer fluid is then between the ammonia desorption temperature T _p of the main salt and the ammonia desorption temperature T _d of the starting salt. The heat transfer fluid is thus able to cool the starter cartridge 8, so that the starter salt finishes desorbing ammonia. Therefore, the fact that the start salt has an ammonia desorption temperature T _d higher than the ammonia desorption temperature T _p of the main salt makes it possible to simultaneously cool the start cartridge 8 and the main cartridge 10 with the same heat transfer fluid. I understand that there is something.

In the feed configuration, the on-off valve 18a is kept open to allow ammonia from the main cartridge 10 to fill the starter cartridge 8. The temperature reduction of the starter salt by the heat transfer fluid allows the absorption of ammonia by the starter salt. When the start cartridge 8 has sufficiently absorbed ammonia, the on/off valve 18a is closed. Thereby, the starting cartridge 8 can be prepared for ammonia release for the next starting of the vehicle 4, etc.

In the feed configuration, the main cartridge 10 is heated by continuing to circulate the heat transfer fluid through the circulation line 22 so that the main cartridge 10 continues to release ammonia for as long as the device 6 requires. This management is controlled by the control unit 40 and the quantitative metering unit 14.

During the feeding configuration, the device 6 is primarily supplied with ammonia by the main cartridge 10.

If there is a peak of ammonia consumption in the device 6, the feed peak mode is carried out, in which case the heater 34 is activated to heat the start cartridge 8, which is refilled with ammonia during the feed mode. do. During this heating, the circulation of heat transfer fluid toward the starter cartridge 8 is restricted so that the starter cartridge 8 is not unnecessarily cooled. Upon heating, the starting salt reaches the ammonia desorption temperature T _d . Then, desorption of ammonia from the starting salt begins. During peak supply conditions, the on-off valve 18a is opened and the ammonia desorbed from the starting salt can thereby leave the starting cartridge 8 and be supplied to the ammonia circulation line 12. Ammonia is metered by quantitative metering unit 14 and provided to ammonia consumption device 6 . During the peak feeding regime, the main cartridge 10 is heated by the heat transfer fluid in the same manner as during the feeding regime. Therefore, during peak supply conditions, the device 6 receives ammonia supply from both the start cartridge 8 and the main cartridge 10.

FIG. 3 shows an ammonia storage system 2' according to a second embodiment of the invention.

The ammonia storage system 2' includes a first heat transfer fluid circulation line 22a arranged such that the heat transfer fluid circulation line 22 allows exchange of heat between the heat transfer fluid and the starter cartridge 8; , the first embodiment in that it includes a second heat transfer fluid circulation line 22b arranged to enable exchange of heat between the heat transfer fluid and each of the main cartridge 10 and the ammonia consumption device 6. different from the ammonia storage system of Circulation of the heat transfer fluid in the first line 22a is performed by a pump 42. The ammonia storage system 2' is capable of exchanging heat between the heat transfer fluid in the first line 22a and the heat transfer fluid in the second line 22b without mixing of the heat transfer fluids in the two lines 22a, 22b. It further includes a heat exchanger 44 configured as follows.

The ammonia storage system 2' includes a three-way valve 25 instead of the four-way valve of the ammonia storage system of the first embodiment. In fact, the second port has been replaced by a heat exchanger 44. The remaining three ports are configured in the same way as in the first embodiment.

The ammonia storage system 2' comprises a control unit 40 configured to carry out a thermal management process of the ammonia storage system 2' similar to that of the first embodiment.

The invention is not limited to the embodiments introduced, but other embodiments will be obvious to those skilled in the art.

In particular, a temperature is set in the heat transfer fluid circulation line to ensure that the temperature T _f of the heat transfer fluid is between the ammonia desorption temperature T _p of the main salt in the feed configuration and the ammonia desorption temperature T _d of the starting salt. It can be envisaged to provide a sensor.

In each embodiment, means other than a pressure sensor could be used to determine the timing of transition from start to feed configuration. For example, a predefined abaque of ammonia storage system data can be used as a criterion for determining when to transition from start to feed. More generally, in order to determine when to make the transition from the start condition to the feed condition, any means or method that can directly or indirectly measure the amount of ammonia in the ammonia circulation line is suitable. It is.

2, 2' Ammonia storage system 4 Vehicle 6 Ammonia consumption device 8 Start cartridge 10 Main cartridge 12 Ammonia circulation line 14 Quantitative metering unit 16 Pressure sensor 18a, 18b On-off valve 20 Passive valve 22 Heat transfer fluid circulation line 22a First transfer Thermal fluid circulation line 22b Second heat transfer fluid circulation line 24 Four-way valve 25 Three-way valve 26 First section 28 Second section 30 Third section 32 Fourth section 34 Heater 36 Pipe 38 AC power supply 40 Control unit 42 Pump 44 Heat exchanger

Claims (11)

A thermal management process in a vehicle ammonia storage system (2, 2'), said system comprising:
- at least one ammonia storage cartridge, referred to as a starter cartridge (8), of ammonia in salt-absorbed form, referred to as a starter salt;
- at least one ammonia storage cartridge, called main cartridge (10), containing ammonia in the form absorbed in a salt, called main salt, in which the ammonia desorption temperature under a given pressure is higher for said starting salt; a storage cartridge;
- a heater (34) arranged to heat said at least one starting cartridge (8) to desorb ammonia stored in said starting salt;
- an ammonia consumption device (6);
- at least one heat transfer device arranged to allow an exchange of heat between a heat transfer fluid and each of said at least one start cartridge (8), said at least one main cartridge (10) and said ammonia consuming device; a fluid circulation line (22);
- an ammonia circulation line (12) connecting said at least one start cartridge (8), said at least one main cartridge (10) and said ammonia consumption device (6), said thermal management process comprising:
- in a starting configuration, activating said heater (34) to heat said at least one starting cartridge (8) and restricting circulation of heat transfer fluid towards said at least one starting cartridge (8); circulating a thermal fluid through the line (22) to heat the at least one main cartridge (10);
- in the supply mode, the heater (34) is stopped and the heat transfer fluid continues to circulate in the line (22) to heat the at least one main cartridge (10), and ammonia is in the line (12); ) to the at least one start cartridge (8). Said ammonia storage system (2, 2') further comprises a pressure sensor (16) in said ammonia circulation line (12), said pressure sensor (16) having a predetermined threshold value, such as 2 bar or 3 bar. 2. The thermal management process of claim 1, wherein the transition from the start configuration to the feed configuration occurs when an ammonia pressure is measured that exceeds . - activating the heater (34) to heat the at least one starting cartridge (8) and restricting circulation of the heat transfer fluid towards the at least one starting cartridge (8) in a supply peak regime; Thermal management process according to claim 1 or 2, wherein the step of continuously circulating the heat transfer fluid through the line (22) to heat the at least one main cartridge (10) is carried out. Thermal management process according to any one of claims 1 to 3, wherein the heater (34) comprises an induction heater. During the feeding regime, the at least one starting cartridge (8) is provided with the heat transfer fluid at a temperature between the ammonia desorption temperature of the main salt and the ammonia desorption temperature of the starting salt under the given pressure. 5. The thermal management process according to any one of claims 1 to 4, further comprising cycling the at least one starter cartridge to cool the at least one start cartridge. The ammonia storage system (2') comprises:
- a first heat transfer fluid circulation line (22a) arranged to allow an exchange of heat between the heat transfer fluid and the at least one starter cartridge (8);
- a second heat transfer fluid circulation line (22b) arranged to allow exchange of heat between said heat transfer fluid and each of said at least one main cartridge (10) and said ammonia consuming device (6); and
The ammonia storage system (2') facilitates the exchange of heat between the heat transfer fluid in the first line (22a) and the heat transfer fluid in the second line (22b), preferably in two lines. further comprising a heat exchanger (44) arranged to allow said heat transfer fluids to do so without intermixing;
Thermal management process according to any one of claims 1 to 4. Thermal management process according to any one of claims 1 to 6, carried out on a vehicle (4). - at least one ammonia storage cartridge, referred to as a starter cartridge (8), of ammonia in salt-absorbed form, referred to as a starter salt;
- at least one ammonia storage cartridge, called main cartridge (10), of ammonia in salt-absorbed form, called main salt;
- a heater (34) arranged to heat the at least one starter cartridge to desorb ammonia stored in the starter salt;
- an ammonia consumption device (6);
- characterized in that it comprises an ammonia circulation line (12) connecting said at least one start cartridge (8), said at least one main cartridge (10) and said ammonia consumption device (6),
- at least one arranged for heat exchange between a heat transfer fluid and each of said at least one start cartridge (8), said at least one main cartridge (10) and said ammonia consumer (6); for a vehicle, further comprising two heat transfer fluid circulation lines (22), and characterized in that the starting salt has an ammonia desorption temperature higher than the ammonia desorption temperature of the main salt under a given pressure. Ammonia storage system (2, 2'). Ammonia storage system (2, 2') according to claim 8, further comprising a control unit (40) arranged to carry out a thermal management process according to any one of claims 1 to 7. Said heater (34) comprises a pipe (36) made of a conductive material, preferably a ferromagnetic material, said pipe (36) comprising:
- heated by induction,
- Ammonia storage system (2) according to claim 8 or 9, configured to form a section of the heat transfer fluid circulation line (22). A motor vehicle (4) comprising an ammonia storage system (2, 2') according to any one of claims 8 to 10.

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