WO2018133115A1

WO2018133115A1 - Exhaust gas treatment apparatus

Info

Publication number: WO2018133115A1
Application number: PCT/CN2017/072240
Authority: WO
Inventors: 王吉; 孙洪雷; 姜大力; 李成龙; 何雨
Original assignee: 吉林省众鑫汽车装备有限公司
Priority date: 2017-01-23
Filing date: 2017-01-23
Publication date: 2018-07-26

Abstract

Disclosed is an exhaust gas treatment apparatus, comprising a treatment device (7), a solid ammonia storage tank (1), a first heating device and an ammonia injection control unit (2). The treatment device (7) separates some exhaust gas and communicates same with the first heating device so as to provide heat therefor. The first heating device heats the solid ammonia storage tank (1) to enable the solid ammonia storage tank to release ammonia. A gas outlet of the solid ammonia storage tank (1) is in communication with the ammonia injection control unit (2). The ammonia injection control unit (2) is in communication with the treatment device (7) via an ammonia outlet pipe (11) so as to provide ammonia to the treatment device for treating exhaust gas in an exhaust gas pipe. A second heating device (6) is disposed in a pipeline from the gas outlet of the solid ammonia storage tank (1) to the treatment device (7) and/or on the ammonia injection control unit (2). The second heating device (6) enables the ammonia from the solid ammonia storage tank (1) to be heated in the pipeline through which the ammonia flows to the treatment device, and enables the ammonia injection control unit (2) in the pipeline to also be heated so as to keep the ammonia in the optimal temperature condition before entering the treatment device (7) for reaction and ensure that the exhaust gas treatment apparatus operates normally at an extremely low outdoor temperature.

Description

Exhaust gas treatment device

Technical field

The invention relates to the technical field of exhaust gas treatment, and in particular to an exhaust gas treatment device.

Background technique

In recent years, China's air pollution is very serious, and nitrogen oxides are one of the important causes of acid rain, haze and photochemical smog. One of the main sources of nitrogen oxide pollution in China is the emission of motor vehicle exhaust. In the prior art, ammonia gas is generally used to treat the exhaust gas, and the release of the ammonia gas is obtained by heating the solid ammonia storage tank, and the obtained ammonia gas needs to pass through the ammonia gas injection control unit before entering the exhaust gas discharge pipe to treat the exhaust gas. Ammonia gas is better at the right temperature.

At present, in the cold regions, due to the lower temperature, the ammonia gas will gradually decrease after flowing out of the solid ammonia storage tank. NH3HCO3 and NH3CO3 will be produced in the whole system, and the ammonia gas will be liquefied to form liquid ammonia, which will affect the treatment effect.

Therefore, how to provide an exhaust gas treatment device to avoid the generation of NH3HCO3, NH3CO3, and avoid liquefaction of ammonia gas is a technical problem to be solved by those skilled in the art.

Summary of the invention

In view of the above, an object of the present invention is to provide an exhaust gas treatment device to avoid generation of NH3HCO3, NH3CO3, and avoid liquefaction of ammonia gas.

In order to achieve the above object, the present invention provides the following technical solutions:

An exhaust gas treatment device includes a processor, a solid ammonia storage tank, a first heating device, and an ammonia gas injection control unit, the processor is disposed on the exhaust pipe, and the processor divides a part of exhaust gas and the first a heating device is connected to provide heat thereto, the first heater heating the solid ammonia storage tank to release ammonia gas, and an air outlet of the solid ammonia storage tank is connected to the ammonia gas injection control unit. The ammonia gas injection control unit communicates with the processor through an ammonia gas outlet pipe to supply ammonia gas to treat the exhaust gas in the exhaust gas pipe, and the gas outlet of the solid ammonia storage tank is connected to the pipeline of the processor And/or the ammonia gas injection control unit is provided with a second heating device.

Preferably, the ammonia gas injection control unit includes an outer wall, and the outer wall is provided with the second heating device.

Preferably, the ammonia gas injection control unit is provided with a temperature sensor, the ammonia gas injection control unit further comprising a data processing device, the data processing device receiving a temperature signal of the temperature sensor and controlling the temperature according to the temperature signal Opening and closing of the second heating device.

Preferably, the second heating device is a coil heating device or a thermistor heating device.

Preferably, the ammonia gas injection control unit includes a preheating rail assembly and a gas rail assembly that are sequentially connected, and an air outlet of the solid ammonia storage tank is in communication with the preheating rail assembly, and the air rail assembly is disposed on the air rail assembly. The ammonia gas outlet pipe is in communication with the processor, the ammonia gas outlet pipe is provided with an ammonia gas metering valve, and the ammonia gas metering valve is provided with the second heating device.

Preferably, the second heating device is plural, and the first ammonia pressure sensor is disposed on the pipeline connecting the solid ammonia storage tank and the preheating rail assembly, and the preheating rail assembly and the air rail total a proportional shut-off valve is disposed on the communication line, the air rail assembly is provided with a second pressure sensor, and the second heating device is further disposed on the first pressure sensor and/or the proportional shut-off valve And/or on the second pressure sensor.

Preferably, the ammonia gas injection control unit includes a preheating rail assembly and a gas rail assembly that are sequentially connected, and an air outlet of the solid ammonia storage tank is in communication with the preheating rail assembly, and the air rail assembly is disposed on the air rail assembly. An ammonia gas outlet pipe is in communication with the processor, and the second heating device is disposed on the preheating rail assembly and/or the gas rail assembly, respectively.

Preferably, the second heating device is disposed on the ammonia gas outlet pipe.

Preferably, the second heating device is disposed on a pipeline connecting the air outlet of the solid ammonia storage tank with the ammonia gas injection control unit.

Preferably, the second heating device is a corrugated heating device, and the second heating device is heated by the exhaust gas.

The exhaust gas treatment device provided by the invention comprises a processor, a solid ammonia storage tank, a first heating device and an ammonia gas injection control unit, wherein the processor is disposed on the exhaust pipe, and the processor divides a part of the exhaust gas and the The first heating device communicates with it to provide heat, and the first heater stores the solid The ammonia tank is heated to release ammonia gas, and an outlet port of the solid ammonia storage tank is in communication with the ammonia gas injection control unit, and the ammonia gas injection control unit is connected to the processor through an ammonia gas outlet pipe to provide the same Ammonia gas is used to treat the exhaust gas in the exhaust gas pipe, and a second heating device is disposed on the gas outlet of the solid ammonia storage tank to the processor and/or the ammonia gas injection control unit. The second heating means allows the ammonia gas exiting the gas outlet of the solids storage tank to be heated on the line flowing to the processor and also heated on the ammonia injection control unit on the line so that the ammonia gas enters The processor can maintain the optimal temperature state before the reaction, avoiding the generation of NH3HCO3, NH3CO3, avoiding the liquefaction of ammonia gas, and ensuring that the exhaust gas treatment device operates normally at an extremely low outdoor temperature.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are Some embodiments of the present invention may also be used to obtain other drawings based on these drawings without departing from the art.

1 is a schematic structural diagram of an exhaust gas treatment device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an exhaust gas treatment device according to an embodiment of the present invention.

In Figure 1 and Figure 2 above:

Solid ammonia storage tank 1, ammonia injection control unit 2, first pressure sensor 3, preheating rail assembly 4, proportional shutoff valve 5, second heating device 6, processor 7, second pressure sensor 8, temperature sensor 9 The ammonia gas metering valve 10, the ammonia gas outlet pipe 11, the corrugated heating device 12, and the air rail assembly 13.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematic structural diagram of an exhaust gas treatment device according to an embodiment of the present invention. FIG. 2 is a schematic structural view of an exhaust gas treatment device according to an embodiment of the present invention.

The exhaust gas processing device provided by the embodiment of the invention comprises a processor 7, a solid ammonia storage tank 1, a first heating device and an ammonia gas injection control unit 2. The processor 7 is disposed on the exhaust pipe, and the processor 7 distributes a part of the exhaust gas and The first heating device communicates with the heat, the first heater heats the solid ammonia storage tank 1 to release the ammonia gas, and the gas outlet of the solid ammonia storage tank 1 communicates with the ammonia gas injection control unit 2, and the ammonia gas injection control unit 2 communicating with the processor 7 through the ammonia gas outlet pipe 11 to supply ammonia gas to treat the tail gas in the tail gas pipe, the gas outlet of the solid ammonia storage tank 1 to the pipeline of the processor 7 and/or the ammonia gas injection control unit 2 A second heating device 6 is provided thereon. The second heating means 6 allows the ammonia gas exiting the gas outlet of the solids storage tank 1 to be heated on the line flowing to the processor 7 and also heated on the ammonia injection control unit 2 on the line, thereby enabling The ammonia gas can be kept at the optimum temperature state before entering the processor 7, avoiding the generation of NH3HCO3, NH3CO3, avoiding the liquefaction of the ammonia gas, and ensuring that the exhaust gas treatment device operates normally at an extremely low outdoor temperature.

The present invention is directed to the existing exhaust gas treatment device. When the vehicle is started, the vehicle generates exhaust gas, and the entire vehicle is powered on. The data processing device receives the data signal in the CAN line and issues an instruction to be processed by the processor. The exhaust gas reaches the solid ammonia storage tank 1 through the first heating device, supplies heat to the solid ammonia storage tank 1, and the solid ammonia storage tank 1 is heated to release ammonia gas, and the ammonia gas is heated in the solid ammonia storage tank 1 to reach The purpose of gas source heating is to effectively ensure the purity of ammonia. In order to allow the ammonia gas to remain in the optimum temperature state after passing through the ammonia gas supply line to the ammonia gas injection control unit and from the ammonia gas injection control unit 2, the present invention provides a solution at the gas outlet of the solid ammonia storage tank 1. A second heating device 6 is disposed on the pipeline to the processor 7 and/or the ammonia gas injection control unit 2, that is, a second position can be set at any position on the gas outlet of the solid ammonia storage tank 1 to the line of the processor 7. A second heating device 6 can be provided at any position or component of the heating device 6, and the ammonia gas injection control unit 2. The ammonia gas which is discharged from the gas outlet of the solid ammonia storage tank 1 is heated on the line which flows to the processor 7, and can also be heated on the ammonia gas injection control unit 2 on the pipeline, so that the ammonia gas enters the treatment. Before the reaction of the reactor 7 is maintained at the optimum temperature state, avoiding the generation of NH3HCO3, NH3CO3, avoiding the liquefaction of the ammonia gas, and ensuring that the exhaust gas treatment device operates normally at an extremely low outdoor temperature.

In order to further optimize the above scheme, the ammonia gas injection control unit 2 is provided with a temperature sensor 9, The ammonia gas injection control unit 2 further includes a data processing device that receives the temperature signal of the temperature sensor 9 and controls the opening and closing of the second heating device 7 in accordance with the temperature signal. The second heating device 7 is a coil heating device or a thermistor heating device.

In specific implementation, when the vehicle is started, the whole vehicle is powered on, and the ammonia gas injection control unit 2 is also powered on, and the temperature of the ammonia gas in the ammonia gas injection control unit 2 is measured in real time by the temperature sensor 9, and the data is fed back to the data processing device. The calculation is performed by the data processing device and an instruction is issued to turn the second heating device 7 on the outer wall on or off. The temperature of the entire ammonia gas injection control unit 2 can be maintained such that the ammonia gas is heated after entering the ammonia gas injection control unit 2 through the ammonia gas supply line, and the ammonia gas is maintained by the adjustment of the temperature sensor 9 and the data processing device. Optimal temperature status.

Specifically, the present invention provides four solutions, and heating by one or more superpositions of the four schemes can ensure that the exhaust gas treatment device operates normally at an extremely low outdoor temperature. The exhaust emissions of motor vehicles can always meet the requirements of national laws and regulations even in alpine regions.

The first solution is to provide a second heating device 6 on the outer wall of the ammonia gas injection control unit: that is, the ammonia gas injection control unit 2 includes an outer wall on which the second heating device 6 is disposed. The second heating device 6 enables the ammonia gas entering the ammonia gas injection control unit 2 to be heated, so that the ammonia gas is maintained at an optimum temperature state, avoiding the generation of NH3HCO3, NH3CO3, avoiding the liquefaction of the ammonia gas, and ensuring that the exhaust gas treatment device is at an outdoor temperature. Very low conditions are working properly.

The second solution is a component heating scheme in which a second heating device 6 is provided on a key component of the ammonia gas injection control unit 2: the ammonia gas injection control unit 2 includes a preheating rail assembly 4 and a total air rail in sequence. 13, the gas outlet of the solid ammonia storage tank 1 is in communication with the preheating rail assembly 4, the ammonia rail outlet pipe 11 is provided with the ammonia gas outlet pipe 11 and the processor 7 is connected, and the ammonia gas outlet pipe 11 is provided with ammonia gas metering. The valve 10 and the ammonia metering valve 10 are provided with a second heating device 6. The second heating device 6 is disposed on the key component of the ammonia gas injection control unit 2 to ensure that the ammonia gas entering the ammonia gas injection control unit 2 is heated while passing through the component, so that the ammonia gas is maintained at an optimum temperature state to avoid generating NH3HCO3. NH3CO3 avoids liquefaction of ammonia gas and ensures that the exhaust gas treatment device operates normally at extremely low outdoor temperatures.

Of course, it can also be disposed on other key components. The second heating device 6 is plural. The first ammonia pressure sensor 3 is disposed on the pipeline connecting the solid ammonia storage tank 1 and the preheating rail assembly 4, and the preheating rail assembly is provided. 4 A proportional shut-off valve 5 is disposed on the pipeline communicating with the air rail assembly 13, and a second pressure sensor 8 is disposed on the air rail assembly 13, and the second heating device 6 is also disposed on the first pressure sensor 3 and/or proportionally cut off On valve 5 and/or on second pressure sensor 8.

The third solution is a gas unit heating scheme in which a second heating device 6 is provided on a corresponding gas unit of the ammonia gas injection control unit 2: the ammonia gas injection control unit 2 includes a preheating rail assembly 4 and gas that are sequentially connected The rail assembly 13, the air outlet of the solid ammonia storage tank 1 is in communication with the preheating rail assembly 4, and the air rail assembly 13 is provided with an ammonia gas outlet pipe 11 communicating with the processor 7, the preheating rail assembly 4 and/or Or a second heating device 6 is provided on the air rail assembly 13, respectively.

The fourth solution is a pipeline heating scheme in which a second heating device 6 is provided on the ammonia gas outlet pipe 11 of the ammonia gas injection control unit 2 or is connected to the ammonia gas injection control unit 2 at the gas outlet of the solid ammonia storage tank 1. The second heating device 6 is disposed on the pipeline: that is, the second heating device 6 is disposed on the ammonia gas outlet pipe 11; 2. The second heating device 6 is disposed at the gas outlet of the solid ammonia storage tank 1 and the ammonia injection control unit. 2 connected pipes. Wherein, the second heating device 6 is a corrugated heating device 12, and the second heating device 6 is heated by the exhaust gas. After the ammonia gas flows out of the ammonia gas outlet pipe 11, it will enter the exhaust gas discharge pipe and react with the exhaust gas. Then, in addition to the above heating of the ammonia gas in the injection control unit 2, a corrugated heating device 12 is added to the ammonia gas outlet pipe 11, The ammonia gas can also be heated in the ammonia gas outlet pipe 11. Finally, it arrives in the processor together with the vehicle exhaust in gaseous form, and fully mixes with the vehicle exhaust in the processor to achieve the purpose of exhaust gas treatment. Through the above heating scheme, the exhaust emissions of the motor vehicle can always be satisfied even in the alpine region. National laws and regulations.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

An exhaust gas treatment device includes a processor, a solid ammonia storage tank, a first heating device, and an ammonia gas injection control unit.

The processor is disposed on the exhaust pipe,

The processor distributes a portion of the exhaust gas to communicate with the first heating device to provide heat thereto, and the first heater heats the solid ammonia storage tank to release ammonia gas.

An air outlet of the solid ammonia storage tank is in communication with the ammonia gas injection control unit, and the ammonia gas injection control unit communicates with the processor through an ammonia gas outlet pipe to supply ammonia gas to the exhaust gas in the exhaust gas pipe Processing,

It is characterized in that

A second heating device is disposed on the gas outlet of the solids storage tank to the line of the processor and/or the ammonia injection control unit.
The exhaust gas treatment apparatus according to claim 1, wherein said ammonia gas injection control unit comprises an outer wall, and said outer wall is provided with said second heating means.
The exhaust gas treatment device according to claim 1, wherein a temperature sensor is disposed in the ammonia gas injection control unit.

The ammonia gas injection control unit further includes a data processing device that receives a temperature signal of the temperature sensor and controls opening and closing of the second heating device according to the temperature signal.
The exhaust gas treatment device according to claim 1, wherein the second heating device is a coil heating device or a thermistor heating device.
The exhaust gas treatment device according to claim 2, wherein said ammonia gas injection control unit comprises a preheating rail assembly and a gas rail assembly that are sequentially connected,

An air outlet of the solid ammonia storage tank is connected to the preheating rail assembly, and the ammonia air outlet tube is disposed on the air rail assembly and communicates with the processor.

An ammonia gas metering valve is arranged on the ammonia gas outlet pipe,

The second heating device is disposed on the ammonia metering valve.
The exhaust gas treatment device according to claim 5, wherein the second heating device is a plurality of

a first pressure sensor is disposed on the pipeline connecting the solid ammonia storage tank and the preheating rail assembly,

The preheating rail assembly is provided with a proportional shut-off valve on the pipeline communicating with the air rail assembly.

a second pressure sensor is disposed on the air rail assembly,

The second heating device is also arranged on the first pressure sensor and/or on the proportional shut-off valve and/or on the second pressure sensor.
The exhaust gas treatment device according to claim 2, wherein said ammonia gas injection control unit comprises a preheating rail assembly and a gas rail assembly that are sequentially connected,

An air outlet of the solid ammonia storage tank is connected to the preheating rail assembly, and an ammonia gas outlet pipe is disposed on the air rail assembly to communicate with the processor.

The second heating device is disposed on the preheating rail assembly and/or on the air rail assembly, respectively.
The exhaust gas treatment device according to claim 1, wherein said second heating means is disposed on said ammonia gas outlet pipe.
The exhaust gas treatment device according to claim 1, wherein said second heating means is provided on a line communicating with an outlet of said solid ammonia storage tank and said ammonia injection control unit.
The exhaust gas treatment device according to any one of claims 8 or 9, wherein the second heating device is a corrugated heating device, and the second heating device is heated by exhaust gas.