Hydrogen supplying and conveying device for tail gas denitration system

Abstract

The utility model provides a hydrogen supply and delivery device for a tail gas denitration system, which comprises a hydrogen tank, an exhaust pipeline, a gas inlet pipeline and a pressure sensor, the gas inlet pipeline is communicated with the hydrogen tank and is used for supplying and conveying hydrogen to the hydrogen tank; the exhaust pipeline is communicated with the hydrogen tank and used for exhausting hydrogen in the hydrogen tank, a protection valve and an injection valve are arranged on the exhaust pipeline, and the protection valve is arranged at the gas inlet end of the injection valve and used for limiting the hydrogen in the hydrogen tank from flowing to the injection valve; and the injection valve is used for regulating and controlling the on-off of the exhaust pipeline. The protection valve is arranged to limit passing of hydrogen under the ideal air pressure, the exhaust pipeline can exhaust the hydrogen under the ideal air pressure, the pressure sensor is arranged to continuously monitor the pressure of the hydrogen in the hydrogen tank, the gas supply state of the hydrogen is conveniently monitored, the exhaust air pressure state is conveniently monitored, and the connection state of all devices on the hydrogen tank is conveniently monitored.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile tail gas denitration, in particular to a hydrogen supply and transmission device for a tail gas denitration system. Background Art

[0002] The NOX emitted by the engine test bench needs to be denitrated before being discharged. Since the denitration reaction of NOX needs to reach 350℃, but when the engine is just started, at low idle speed or the aftertreatment system is far away from the engine, the exhaust gas temperature is far from 350℃, and is only about 100℃. Therefore, it is generally necessary to heat it before denitration.

[0003] In order to prevent energy waste, hydrogen is used as a reducing agent to denitrify NOX and convert it into N2 and H2O. When hydrogen is used as a reducing agent, it is only necessary to supply compressed hydrogen to the reaction catalyst. The reaction can occur when the reaction temperature reaches 100°C. At the same time, the reactants do not contain carbon, and no CO2 is produced after combustion, which facilitates gas emissions.

[0004] The invention with publication number CN117225183A proposes a tail gas denitration device, which relates to the technical field of tail gas treatment equipment, including a tower body, one side of the tower body is connected to an air intake pipe, a catalyst spray rack is installed on the top of the tower top, a decomposition reaction layer is fixed below the catalyst spray rack, and a rolling air intake mechanism is provided between the decomposition reaction layer and the catalyst spray rack, and the rolling air intake mechanism is used to change the direction of tail gas intake. However, the above tail gas denitration device is still inconvenient to supply compressed hydrogen to the reaction device when in use, so this scheme specifically proposes a hydrogen supply device for the tail gas denitration system to solve the above problem. Utility Model Content

[0005] In view of this, the utility model proposes a hydrogen supply and transmission device for an exhaust gas denitrification system, which limits the passage of hydrogen at an ideal pressure by setting a protective valve, so that the exhaust pipeline can discharge hydrogen at an ideal pressure, and continuously monitors the hydrogen pressure in the hydrogen tank by setting a pressure sensor, thereby facilitating the monitoring of the hydrogen supply status, the monitoring of the exhaust pressure status, and the monitoring of the connection status of various components on the hydrogen tank.

[0006] The technical solution of the utility model is implemented as follows: The utility model provides a hydrogen supply and delivery device for an exhaust gas denitration system, including a hydrogen tank, an exhaust pipeline, an intake pipeline and a pressure sensor, wherein:

[0007] Hydrogen tank, used to store hydrogen;

[0008] an air inlet pipeline, connected to the hydrogen tank, and used for supplying hydrogen to the hydrogen tank;

[0009] an exhaust pipeline, which is in communication with the hydrogen tank and is used to discharge the hydrogen in the hydrogen tank. A protection valve and an injection valve are provided on the exhaust pipeline. The protection valve is provided at the air inlet end of the injection valve and is used to limit the flow of hydrogen in the hydrogen tank to the injection valve. The injection valve is used to regulate the on-off of the exhaust pipeline;

[0010] The pressure sensor is arranged on the hydrogen tank and is used to monitor the gas pressure in the hydrogen tank.

[0011] On the basis of the above technical solution, preferably, it also includes an exhaust nozzle, wherein:

[0012] The exhaust nozzle is an SCR nozzle, which is arranged on the exhaust pipeline and is connected with the outlet end of the injection valve.

[0013] On the basis of the above technical solution, preferably, it also includes an emptying pipeline, wherein:

[0014] The exhaust pipeline is connected to the hydrogen tank and is used to exhaust the gas in the hydrogen tank into the external atmosphere.

[0015] On the basis of the above technical solution, preferably, it also includes an intake valve and an exhaust valve, wherein:

[0016] An air intake valve, arranged on the air intake pipeline, for regulating the on-off of the air intake pipeline;

[0017] The drain valve is arranged on the drain pipeline and is used to regulate the on-off of the drain pipeline.

[0018] On the basis of the above technical solution, preferably, the protection valve, injection valve, intake valve and exhaust valve are all pneumatic diaphragm valves.

[0019] On the basis of the above technical solution, preferably, it further comprises a plurality of solenoid valves, wherein:

[0020] A plurality of solenoid valves are connected with the protection valve, the injection valve, the intake valve or the exhaust valve, and are used to control the protection valve, the injection valve, the intake valve or the exhaust valve.

[0021] On the basis of the above technical solution, preferably, it also includes a gas transmission pipeline, wherein:

[0022] The gas pipeline is connected to the intake valve, and the protection valve, injection valve and exhaust valve are all connected to the gas pipeline. The pressure sensor is arranged on the gas pipeline to monitor the gas pressure in the gas pipeline.

[0023] On the basis of the above technical solution, preferably, it further comprises a compressed air input device connected to the gas pipeline, and the compressed air input device is used to supply compressed air to the gas pipeline.

[0024] On the basis of the above technical solution, preferably, it also includes an OBD alarm electrically connected to the pressure sensor, for feeding back the air pressure monitored by the pressure sensor.

[0025] Compared with the prior art, the hydrogen supply and delivery device for the tail gas denitration system of the utility model has the following advantages:

[0026] Beneficial effects:

[0027] (1) The protective valve is used to limit the passing air pressure, thereby completing the discharge processing of the compressed hydrogen for the denitration reaction of automobile exhaust. During the exhaust, the injection valve can be used to control the on-off of the exhaust pipeline. By setting a protective valve to limit the passage of hydrogen at an ideal air pressure, the exhaust pipeline can discharge hydrogen at an ideal air pressure. By setting a pressure sensor to continuously monitor the hydrogen pressure in the hydrogen tank, it is convenient to monitor the hydrogen supply status, the exhaust pressure status, and the connection status of each device on the hydrogen tank.

[0028] (2) In a specific implementation, the SCR nozzle is a selective catalytic reduction nozzle. By arranging the SCR nozzle in the exhaust pipe, the compressed hydrogen in the exhaust pipe can be sprayed out in the form of fine mist through the SCR nozzle, which is convenient for the catalytic reduction reaction of nitrogen oxides. When the catalytic reduction reaction of nitrogen oxides is carried out, nitrogen oxides and hydrogen are adsorbed on the surface of the catalyst. Under the action of the catalyst, the nitrogen oxides and hydrogen undergo a redox reaction to generate nitrogen and water. The arrangement of the SCR nozzle helps to increase the redox reaction efficiency of nitrogen oxides. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 This is a schematic structural diagram of a hydrogen supply and transmission device for a tail gas denitration system of the utility model;

[0031] Figure 2 This is a system schematic diagram of a hydrogen supply and transmission device for a tail gas denitration system of the utility model. DETAILED DESCRIPTION

[0032] The following will be combined with the implementation of the utility model to clearly and completely describe the technical solutions in the implementation of the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figures 1-2 As shown, the hydrogen supply device for the exhaust gas denitration system of the utility model is characterized by comprising a hydrogen tank 1, an exhaust pipeline 2, an intake pipeline 3 and a pressure sensor 4, wherein the hydrogen tank 1 is used to store hydrogen; the intake pipeline 3 is connected to the hydrogen tank 1, and is used to supply hydrogen to the hydrogen tank 1; the exhaust pipeline 2 is connected to the hydrogen tank 1, and is used to discharge the hydrogen in the hydrogen tank 1, and a protection valve 21 and an injection valve 22 are provided on the exhaust pipeline 2, the protection valve 21 is provided at the intake end of the injection valve 22, and is used to limit the flow of hydrogen in the hydrogen tank 1 to the injection valve 22, and the injection valve 22 is used to regulate the on-off of the exhaust pipeline 2; the pressure sensor 4 is provided on the hydrogen tank 1, and is used to monitor the air pressure in the hydrogen tank 1.

[0034] In the specific implementation, the air pressure passing through the protection valve 21 is limited. When the hydrogen tank 1 needs to be pressurized and hydrogen is supplied, the protection valve 21 and the injection valve 22 are closed, and the hydrogen tank 1 is continuously supplied with gas through the intake pipe 3. During the supply period, the air pressure in the hydrogen tank 1 is continuously monitored by the pressure sensor 4. When the air pressure in the hydrogen tank 1 reaches the ideal pressure value within the predetermined time, the protection valve 21 and the injection valve 22 are opened to discharge the compressed air from the exhaust pipe 2, thereby completing the discharge process of the compressed hydrogen for the denitration reaction of the automobile exhaust. During the exhaust period, the exhaust pipe 2 can be regulated by the injection valve 22. If the hydrogen pressure in the hydrogen tank 1 does not reach the ideal pressure within the predetermined time, an error report is required for maintenance. By setting a protective valve 21 to limit the passage of hydrogen at an ideal pressure, the exhaust pipe 2 can discharge hydrogen at an ideal pressure. By setting a pressure sensor 4 to continuously monitor the hydrogen pressure in the hydrogen tank 1, it is convenient to monitor the hydrogen supply status, the exhaust pressure status, and the connection status of each device on the hydrogen tank 1.

[0035] As a preferred embodiment, it further includes an exhaust nozzle 23 , wherein the exhaust nozzle 23 is an SCR nozzle, which is arranged on the exhaust pipeline 2 and is connected to the gas outlet end of the injection valve 22 .

[0036] In a specific implementation, the SCR nozzle is a selective catalytic reduction nozzle. By arranging the SCR nozzle on the exhaust pipe 2, the compressed hydrogen on the exhaust pipe 2 can be sprayed out in the form of fine mist through the SCR nozzle, so as to facilitate the catalytic reduction reaction of nitrogen oxides. When the catalytic reduction reaction of nitrogen oxides is carried out, nitrogen oxides and hydrogen are adsorbed on the surface of the catalyst. Under the action of the catalyst, the nitrogen oxides undergo an oxidation-reduction reaction with hydrogen to generate nitrogen and water. The arrangement of the SCR nozzle helps to increase the efficiency of the oxidation-reduction reaction of nitrogen oxides.

[0037] The specific chemical formulas for the oxidation and reduction of nitrogen oxides and hydrogen are: 2H2+2NO→N2+2H2O; 4H2+2NO2→N2+4H2O.

[0038] As a preferred embodiment, it also includes an exhaust pipeline 5, wherein the exhaust pipeline 5 is connected to the hydrogen tank 1 and is used to discharge the gas in the hydrogen tank 1 into the external atmosphere.

[0039] Specifically, before hydrogen is supplied, the hydrogen tank 1 needs to be purged and emptied. When the hydrogen tank 1 is emptied, the intake pipe 3 and the exhaust pipe 2 are closed, and the exhaust pipe 5 is opened. The pressure sensor 4 continuously monitors the air pressure in the hydrogen tank 1. When the air pressure in the hydrogen tank 1 is close to 0 or the exhaust pipe 5 is opened to reach a preset value, the emptying of the hydrogen tank 1 is completed. When the hydrogen tank 1 is purged, the intake pipe 3, the protection valve 21 and the injection valve 22 are opened, and an inert gas is introduced through the intake pipe 3. The inert gas can flow through each pipe, thereby completing the purging of each pipe.

[0040] As a preferred embodiment, it also includes an intake valve 31 and an exhaust valve 51, wherein the intake valve 31 is arranged on the intake pipeline 3 to regulate the on-off of the intake pipeline 3; the exhaust valve 51 is arranged on the exhaust pipeline 5 to regulate the on-off of the exhaust pipeline 5.

[0041] In a specific implementation, the on-off of the intake pipeline 3 can be regulated by the intake valve 31 , and the on-off of the exhaust pipeline 5 can be regulated by the exhaust valve 51 .

[0042] As a preferred embodiment, the protection valve 21, the injection valve 22, the air intake valve 31 and the exhaust valve 51 are all pneumatic diaphragm valves.

[0043] As a preferred embodiment, it further includes a plurality of solenoid valves 6 , wherein the plurality of solenoid valves 6 are used to control the protection valve 21 , the injection valve 22 , the intake valve 31 or the exhaust valve 51 .

[0044] In a specific implementation, multiple valves are regulated by multiple solenoid valves 6 , and a control cabinet is provided outside to control the multiple solenoid valves 6 .

[0045] As a preferred embodiment, it also includes a gas pipeline 7, wherein the gas pipeline 7 is connected to the intake valve 31, and the protection valve 21, the injection valve 22 and the exhaust valve 51 are all connected to the gas pipeline 7, and the pressure sensor 4 is arranged on the gas pipeline 7 for monitoring the air pressure in the gas pipeline 7.

[0046] As a preferred embodiment, it also includes a compressed air input device connected to the air pipeline 7, and the compressed air input device is used to supply compressed air to the air pipeline 7.

[0047] Such a design allows the hydrogen to be compressed while passing through the gas pipeline 7, and compressed air can also be supplied into the gas pipeline 7. The supply of compressed air can speed up the compression of the hydrogen. At the same time, the supply of compressed air can supply sufficient oxygen to the redox reaction to speed up the redox efficiency of nitrogen oxides.

[0048] As a preferred implementation, it also includes an OBD alarm electrically connected to the pressure sensor 4 for feeding back the air pressure monitored by the pressure sensor 4 .

[0049] In specific implementation, the current theoretical maximum injection amount is calculated according to n=PV / RT, the opening time of the injection valve 22 is determined, and it is judged whether the pressure drop is normal. If it is normal, exhaust continues; if it is abnormal, an OBD alarm is issued.

[0050] The working principle of the utility model is introduced as follows:

[0051] First, the drain valve 51 is opened to drain the hydrogen tank 1, and then the intake valve 31, the protection valve 21 and the injection valve 22 are opened at the same time to complete the purging of each pipeline. Specifically, when hydrogen needs to be supplied, the protection valve 21 and the injection valve 22 are closed, and the hydrogen tank 1 is continuously supplied with gas through the intake pipeline 3. During the gas supply, the air pressure in the hydrogen tank 1 is continuously monitored by the pressure sensor 4. When the air pressure in the hydrogen tank 1 reaches the ideal pressure value within a predetermined time, the protection valve 21 and the injection valve 22 are opened to discharge the compressed air from the exhaust pipeline 2 through the exhaust nozzle 23, thereby completing the discharge of the compressed hydrogen.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hydrogen supply device for a tail gas denitration system, characterized in that: It comprises a hydrogen tank (1), an exhaust pipeline (2), an intake pipeline (3) and a pressure sensor (4), wherein: A hydrogen tank (1), used for storing hydrogen; An air intake pipeline (3) is connected to the hydrogen tank (1) and is used to supply hydrogen to the hydrogen tank (1); An exhaust pipeline (2) is connected to the hydrogen tank (1) and is used to discharge the hydrogen in the hydrogen tank (1). A protection valve (21) and an injection valve (22) are provided on the exhaust pipeline (2). The protection valve (21) is provided at the air inlet end of the injection valve (22) and is used to limit the flow of hydrogen in the hydrogen tank (1) to the injection valve (22). The injection valve (22) is used to regulate the on-off of the exhaust pipeline (2); A pressure sensor (4) is arranged on the hydrogen tank (1) and is used to monitor the gas pressure in the hydrogen tank (1).

2. The hydrogen supply and delivery device for the tail gas denitration system according to claim 1, characterized in that: Also included is an exhaust nozzle (23), wherein: The exhaust nozzle (23) is an SCR nozzle, which is arranged on the exhaust pipeline (2) and is connected to the gas outlet end of the injection valve (22).

3. The hydrogen supply and delivery device for the tail gas denitration system according to claim 1, characterized in that: It also includes an exhaust pipeline (5), wherein: The exhaust pipeline (5) is connected to the hydrogen tank (1) and is used to exhaust the gas in the hydrogen tank (1) into the external atmosphere.

4. The hydrogen supply and delivery device for the tail gas denitration system according to claim 3, characterized in that: It also includes an air intake valve (31) and an exhaust valve (51), wherein: An air intake valve (31), arranged on the air intake pipeline (3), and used for regulating the on-off of the air intake pipeline (3); The drain valve (51) is arranged on the drain pipeline (5) and is used to regulate the on-off of the drain pipeline (5).

5. The hydrogen supply and delivery device for the tail gas denitration system according to claim 4, characterized in that: The protection valve (21), the injection valve (22), the air intake valve (31) and the exhaust valve (51) are all pneumatic diaphragm valves.

6. The hydrogen supply and delivery device for the tail gas denitration system according to claim 5, characterized in that: It also includes a plurality of solenoid valves (6), wherein: A plurality of solenoid valves (6) are connected to the protection valve (21), the injection valve (22), the intake valve (31) or the exhaust valve (51), and are used to control the protection valve (21), the injection valve (22), the intake valve (31) or the exhaust valve (51).

7. The hydrogen supply and delivery device for the tail gas denitration system according to claim 6, characterized in that: It also includes a gas transmission pipeline (7), wherein: The gas pipeline (7) is connected to the gas inlet valve (31), and the protection valve (21), the injection valve (22) and the exhaust valve (51) are all connected to the gas pipeline (7). The pressure sensor (4) is arranged on the gas pipeline (7) and is used to monitor the gas pressure in the gas pipeline (7).

8. The hydrogen supply and delivery device for the tail gas denitration system according to claim 7, characterized in that: It also comprises a compressed air input device connected to the air delivery pipeline (7), and the compressed air input device is used to supply compressed air to the air delivery pipeline (7).

9. The hydrogen supply and delivery device for the tail gas denitration system according to claim 1, characterized in that: It also includes an OBD alarm electrically connected to the pressure sensor (4) and used to feed back the air pressure monitored by the pressure sensor (4).

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