CN215486218U

CN215486218U - Ammonia supply system and vehicle

Info

Publication number: CN215486218U
Application number: CN202121448810.5U
Authority: CN
Inventors: 张克金; 丰永刚; 张鹏; 韩建; 崔新然; 曹婷婷; 边海东
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2022-01-11
Anticipated expiration: 2031-06-28

Abstract

The utility model discloses an ammonia supply system and a vehicle. The ammonia gas storage component comprises a poor ammonia tank filled with the ammonia storage material and an ammonia-rich tank filled with the ammonia storage material, wherein the poor ammonia tank and the ammonia-rich tank are connected through a one-way valve, and only the ammonia gas between the poor ammonia tank and the ammonia-rich tank is allowed to flow from the ammonia-rich tank to the ammonia-poor tank in a one-way mode. The ammonia gas delivery assembly comprises an air guide pipe, and the air guide pipe is connected to the lean ammonia tank and the front end of the SCR post-processor of the vehicle. The vehicle comprises a vehicle body, an exhaust pipe arranged on the vehicle body, and an SCR postprocessor and the ammonia supply system, wherein the SCR postprocessor is arranged at the tail end of the exhaust pipe. The design of the double ammonia tank can realize that the single ammonia tank is lighter and the total capacity meets longer endurance, and the lighter ammonia tank has more space which can be arranged on a small vehicle. Therefore, the ammonia supply system has the advantages that the requirement on the size of the required arrangement space is reduced, the limitation on the arrangement space is smaller, and the ammonia supply system can be well applied to small vehicles.

Description

Ammonia supply system and vehicle

Technical Field

The utility model relates to the field of tail gas treatment, in particular to an ammonia supply system and a vehicle.

Background

As a travel tool, the automobile greatly facilitates the daily life of people, and the number of the automobiles is increased along with the progress of economy and society. However, since the emission of nitrogen oxides contained in automobile exhaust gases undesirably causes serious environmental pollution, the standards for automobile exhaust emissions are becoming more stringent. Currently, in the market, SCR (Selective Catalytic Reduction) uses ammonia gas as a reducing agent, which is the preferred technical route for commercial vehicle aftertreatment, and the reaction equation is as follows:

NO+NO₂+2NH₃→2N₂+3H₂O

4NO+O₂+4NH₃→4N₂+6H₂O

2NO₂+O₂+4NH₃→3N₂+6H₂O。

from the national fourth and fifth standards to the national sixth standard, SCR methods are generally used in vehicles to reduce the amount of nitrogen oxides emitted.

However, in the operation of the SCR post-processor in the conventional vehicle, the ammonia gas decomposed by the liquid urea aqueous solution is mostly a reducing agent, and the urea system needs to be equipped with components such as a urea storage container, a urea pump, an injection module, a metering module and the like, and has a large volume. Therefore, the liquid urea system cannot be applied to nitrogen oxide purification of passenger vehicles or small commercial vehicles.

And to large-scale commercial car usually adopt the solid ammonia system, through filling the large-scale ammonia storage container who has stored up the ammonia material, adsorb the ammonia and store at normal atmospheric temperature to adopt the heating method to release the ammonia under specific operating mode, supply to SCR post processor, satisfy SCR post processor's operating mode demand.

When the solid ammonia system is applied to a passenger vehicle or a small commercial vehicle, the large ammonia storage container which is too large in size and weight cannot be supported in consideration of the limited space of the passenger vehicle or the small commercial vehicle; if the volume of the ammonia storage container is simply reduced, the problem of insufficient ammonia storage amount exists.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an ammonia supply system that can be applied to a small vehicle space and that satisfies the demand for the amount of ammonia stored in the small vehicle.

It is also necessary to provide a vehicle equipped with the above-described ammonia supply system.

An ammonia supply system comprising:

the ammonia gas storage assembly comprises a lean ammonia tank filled with an ammonia storage material and an ammonia-rich ammonia tank filled with the ammonia storage material, wherein the lean ammonia tank and the ammonia-rich ammonia tank are connected through a one-way valve, and only ammonia gas between the lean ammonia tank and the ammonia-rich ammonia tank is allowed to flow from the ammonia-rich ammonia tank to the lean ammonia tank in a one-way mode; and

and the ammonia gas conveying assembly comprises an air guide pipe, and the air guide pipe is connected with the ammonia poor tank and the SCR (selective catalytic reduction) postprocessor in the vehicle.

In one embodiment, the ammonia supply system comprises a control assembly, wherein the control assembly is in communication connection with an engine, the SCR aftertreatment device and the ammonia gas delivery assembly in a vehicle and is used for monitoring and controlling the operation of the engine according to the monitored current working condition of the engine; and is also used for monitoring and controlling the supply of ammonia gas in the ammonia gas storage assembly according to the monitored current working condition of the SCR post-processor.

In one embodiment, the control assembly comprises an engine ECU and a metering control DCU, wherein the engine ECU is in communication connection with the metering control DCU;

the engine ECU is used for monitoring the current working condition of the engine and controlling the operation of the engine; and the metering control DCU is used for monitoring the current working condition of the SCR postprocessor and controlling the supply of ammonia in the ammonia storage assembly.

In one embodiment, the ammonia gas delivery assembly comprises a proportional valve connected between the ammonia-lean tank and the gas guide tube;

the proportional valve is in communication connection with the metering control DCU, and the metering control DCU controls the opening of the proportional valve according to the current working condition of the SCR post-processor.

In one embodiment, the ammonia supply system comprises a heating device for heating the ammonia lean tank.

In one embodiment, the heating device is an electric heating bag, and the electric heating bag is wrapped on the outer surface of the ammonia-poor tank.

In one embodiment, the heating device is heated by preheating with the vehicle antifreeze solution.

In one embodiment, the ammonia-lean tank is placed in the engine compartment or trunk of a vehicle.

In one embodiment, the ammonia-poor tank and the ammonia-rich tank are respectively filled with 1 kg-1.4 kg of ammonia storage materials.

A vehicle comprises a vehicle body, an exhaust pipe arranged on the vehicle body, an SCR (selective catalytic reduction) postprocessor and the ammonia supply system; the SCR postprocessor is arranged at the tail end of the exhaust pipe.

The ammonia supply system comprises an ammonia gas storage assembly for storing ammonia gas and an ammonia gas delivery assembly for delivering the stored ammonia gas to the SCR post-processor of the vehicle, wherein the ammonia gas storage assembly comprises two ammonia tanks, one ammonia tank is an ammonia poor tank for directly providing the ammonia gas for the SCR of the vehicle, and the other ammonia tank is an ammonia rich tank serving as a compensation tank of the ammonia poor tank. The design of the double ammonia tank can enable each single ammonia tank to be lighter, meanwhile, the total capacity can meet the endurance of longer mileage, the lighter ammonia tank has more space which can be arranged on a small vehicle, and in addition, compared with the traditional liquid urea ammonia source, the scheme of adopting the solid ammonia source is simplified. Therefore, the ammonia supply system can reduce the size requirement of the required arrangement space, has smaller limitation on the arrangement space, and can be well applied to small vehicles.

Drawings

FIG. 1 is a schematic diagram of an ammonia supply system according to an embodiment of the present invention.

10. An ammonia gas storage assembly; 11. a lean ammonia tank; 12. an ammonia-rich ammonia tank; 13. a one-way valve; 14. an electrical heating pack; 20. an ammonia gas delivery assembly; 21. a proportional valve; 22. an air duct; 31. an engine ECU; 32. a metering control DCU; 4. an engine; 5. an exhaust pipe; 6. SCR postprocessor.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1, an ammonia supply system according to an embodiment of the present invention includes an ammonia gas storage assembly 10 and an ammonia gas delivery assembly 20. The ammonia gas storage assembly 10 comprises a lean ammonia tank 11 filled with an ammonia storage material and an ammonia-rich ammonia tank 12 filled with the ammonia storage material, wherein the lean ammonia tank 11 and the ammonia-rich ammonia tank 12 are connected through a one-way valve 13, only ammonia gas between the lean ammonia tank 11 and the ammonia-rich ammonia tank 12 is allowed to flow from the ammonia-rich ammonia tank 12 to the lean ammonia tank 11 in a one-way mode, and the ammonia storage material is filled in both the lean ammonia tank 11 and the ammonia-rich ammonia tank 12. The ammonia gas delivery assembly 20 includes a gas conduit 22, and the gas conduit 22 is connected to the ammonia-lean tank 11 and the SCR aftertreatment unit 6 of the vehicle.

The ammonia supply system of the present application fills ammonia gas into the ammonia lean tank 11 and the ammonia rich tank 12 in advance before use, and the filled ammonia gas is absorbed by the ammonia storage materials filled in the ammonia lean tank 11 and the ammonia rich tank 12 and stored in a solid form. For use in an ammonia system, ammonia stored in the ammonia-lean tank 11 is released as a gas and transported to the SCR aftertreatment unit 6 via the gas duct 22. With the consumption of the ammonia gas in the ammonia-poor tank 11, a certain vacuum degree is formed in the ammonia-poor tank 11, and when the vacuum degree is greater than the vacuum degree in the ammonia-rich tank 12, a pressure difference is generated between the vacuum degree and the vacuum degree, so that the ammonia gas in the ammonia-rich tank 12 flows to the ammonia-poor tank 11 along the check valve 13. The ammonia tank in the ammonia gas storage assembly 10 is designed into two, one is an ammonia-poor tank 11 for directly supplying ammonia gas to the SCR aftertreatment device of the vehicle, and the other is an ammonia-rich tank 12 as a compensation tank of the ammonia-poor tank 11. The design of the double ammonia tank can realize that the total capacity can meet the endurance of longer mileage while each individual ammonia tank is lighter, and the lighter ammonia tank has more space which can be arranged on a small vehicle, and in addition, compared with the traditional liquid urea ammonia source, the scheme of adopting the solid ammonia source is simplified. Therefore, the ammonia supply system has the advantages that the requirement on the size of the required arrangement space is reduced, the limitation on the arrangement space is smaller, and the ammonia supply system can be well applied to small vehicles.

Further, the ammonia-poor tank 11 and the ammonia-rich tank 12 are filled with 1kg to 1.4kg of ammonia storage material. Although a single ammonia tank is more portable and has a smaller capacity, the total capacity of two ammonia tanks is sufficient for the displacement and mileage of a small vehicle. It is understood that the capacity of the ammonia-lean tank 11 and the ammonia-rich tank 12 may be designed according to the requirement, and the capacity between the two is not necessarily the same, for example, the capacity of the ammonia-lean tank 11 is designed to be smaller and lighter, such as 0.8kg, and the like, and is not limited in particular.

Further, the ammonia supply system comprises a heating device for heating the ammonia lean tank 11. The heating device can provide a proper and relatively stable temperature environment for the ammonia poor tank 11, so as to ensure the heat release performance of ammonia in the ammonia poor tank 11 and the stability of providing ammonia gas

Specifically, the ammonia-lean tank 11 is placed in the engine compartment or trunk of the vehicle. The poor ammonia tank 11 is placed in an engine compartment or a trunk, so that the external influence of partial ambient temperature and air cooling effect in driving on the release of ammonia gas from solid ammonia and stable ammonia supply is naturally eliminated, and once the poor ammonia tank 11 is set to a proper temperature, the temperature can be maintained for a long time, and the stability of ammonia supply of a system is ensured.

In some embodiments, the heating device is used for preheating by using the antifreeze solution of the vehicle, the original heat source of the vehicle can be fully utilized by using the antifreeze solution for preheating, and a separate heating device is not used for specially heating the ammonia-poor tank 11, so that the heating device is economical and practical.

In some embodiments, the heating device is an electric heating bag 14, and the electric heating bag 14 is wrapped on the outer surface of the ammonia-lean tank 11. Adopt the mode of electrical heating, device simple structure, response speed is fast, and compare exhaust heating and can need not wait carminative production direct heating, such heating method does not have special requirement to the position simultaneously, and is very convenient.

In some embodiments, the ammonia supply system further includes a control assembly 30 communicatively coupled to the engine 4, the SCR aftertreatment device 6, and the ammonia delivery assembly 20 of the vehicle for monitoring and controlling operation of the engine 4 based on the monitored current operating conditions of the engine 4. And at the same time for monitoring and controlling the supply of ammonia gas in the ammonia gas storage assembly 10 in accordance with the monitored current operating conditions of the SCR aftertreatment device 6. The addition of the control assembly 30 allows for better monitoring of vehicle operating conditions and exhaust treatment conditions within the SCR aftertreatment device 6 and better tailoring of the ammonia supply system operation based on the status of the conditions obtained.

Further, the control module 30 includes an engine ECU31 and a metering control DCU32, the engine ECU31 being communicatively coupled to the metering control DCU 32. The engine ECU31 may be one that is originally equipped with the vehicle, and only pins and interfaces are reserved for communication with the metering control DCU 32. The engine ECU31 is used to monitor the current operating conditions of the engine 4 and control the operation of the engine 4, and the dosing control DCU32 is used to monitor the current operating conditions of the SCR aftertreatment device 6 and control the supply of ammonia gas to the ammonia gas delivery assembly 20.

Further, the ammonia gas delivery assembly 20 comprises a proportional valve 21, the proportional valve 21 is connected between the ammonia-lean tank 11 and the gas guide pipe 22, the proportional valve 21 is in communication connection with a metering control DCU32, and the metering control DCU32 controls the opening degree of the proportional valve 21 according to the current working condition of the SCR postprocessor 6. A proportional valve 21 is added and the proportional valve 21 is communicatively connected to the metering control DCU32 and controlled by the metering control DCU 32. The metering control DCU32 can more accurately know the required ammonia amount by detecting the working condition of the SCR post processor 6, and then sends an instruction to the proportional valve 21 to change the opening of the proportional valve 21 so as to control the ammonia spraying amount, so that the ammonia supply system can more accurately provide ammonia.

The utility model further provides a vehicle which comprises a vehicle body, an exhaust pipe 5 arranged on the vehicle body, an SCR post processor 6 and the ammonia supply system, wherein the SCR post processor is arranged at the tail end of the exhaust pipe.

The ammonia tank of the ammonia storage assembly 10 of the ammonia supply system is designed into two, namely a lean ammonia tank 11 for directly supplying ammonia gas for the vehicle SCR, and an ammonia-rich tank 12 as a compensation tank of the lean ammonia tank 11. The design of the double ammonia tank can enable each single ammonia tank to be lighter, meanwhile, the total capacity can meet the endurance of longer mileage, the lighter ammonia tank has more space which can be arranged on a small vehicle, and in addition, compared with the traditional liquid urea ammonia source, the scheme of adopting the solid ammonia source is simplified. Therefore, the ammonia supply system can reduce the size requirement of the required arrangement space, has smaller limitation on the arrangement space, and can be well applied to small vehicles. Meanwhile, a control assembly is added to better monitor the running state of the vehicle and the tail gas treatment state in the SCR postprocessor 6, and the work of the ammonia supply system is better allocated according to the acquired state condition, so that the ammonia supply system can more accurately provide ammonia gas, and the SCR can be ensured to work well.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An ammonia supply system, comprising:

2. An ammonia supply system according to claim 1, comprising a control assembly communicatively connected to an engine, the SCR aftertreatment device and the ammonia delivery assembly in a vehicle for monitoring and controlling operation of the engine in accordance with monitored current operating conditions of the engine; and is also used for monitoring and controlling the supply of ammonia gas in the ammonia gas storage assembly according to the monitored current working condition of the SCR post-processor.

3. The ammonia supply system of claim 2, wherein the control assembly includes an engine ECU and a metering control DCU, the engine ECU communicatively coupled to the metering control DCU;

4. The ammonia supply system of claim 3, wherein the ammonia gas delivery assembly comprises a proportional valve connected between the ammonia lean tank and the gas conduit;

5. An ammonia supply system in accordance with claim 1, comprising a heating device for heating the ammonia lean tank.

6. An ammonia supply system as defined in claim 5, wherein the heating device is an electrical heating pack wrapped around an exterior surface of the ammonia lean tank.

7. An ammonia supply system according to claim 5, wherein the heating means is preheated by the antifreeze solution of the vehicle.

8. The ammonia supply system of claim 1, wherein the ammonia lean tank is placed in a vehicle engine compartment or a vehicle trunk.

9. The ammonia supply system according to claim 1, wherein the ammonia-poor tank and the ammonia-rich tank are filled with 1kg to 1.4kg of ammonia storage material.

10. A vehicle comprising a vehicle body, an exhaust pipe provided on the vehicle body, an SCR aftertreatment device, and the ammonia supply system of claims 1-9; the SCR postprocessor is arranged at the tail end of the exhaust pipe.