Multifunctional liquid ammonia sensor and tail gas treatment liquid ammonia device
By designing a multi-functional liquid ammonia sensor, using control valves and heating pipelines to achieve gasification and transportation of liquid ammonia, the problem that liquid ammonia sensors in the prior art cannot be adapted to the SCR system, and the efficiency and climate benefits of exhaust gas treatment are improved.
Patent Information
- Application Number
- CN202421811073.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-29
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-07-29
AI Technical Summary
The existing liquid ammonia sensors cannot adapt to ammonia gas directly involved in the exhaust gas treatment of the SCR system, and cannot effectively gasify and transport ammonia gas, resulting in long reaction time and climate greenhouse effects problems.
A multifunctional liquid ammonia sensor is designed, including a mounting piece, a first on-off control valve, a piping joint and a heating pipe. The on-off between the liquid ammonia tank and the piping joint is controlled through the control valve, and the liquid ammonia is heated by heating the heating pipe to gasify it, integrating the liquid level, temperature and pressure measurement functions.
Effective gasification and transportation of liquid ammonia is achieved, the problem of insufficient pressure at low temperatures is solved, the structure is simplified and the reaction efficiency of the SCR system is improved.
Smart Images
Figure CN223062512U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of tail gas treatment, in particular to a multifunctional liquid ammonia sensor and a tail gas treatment liquid ammonia device. Background Art
[0002] The mainstream technical route for diesel vehicle tail gas treatment is the SCR system. In the SCR system, the urea solution is stored in a urea tank provided on the vehicle. At the same time, a urea sensor is used in the urea tank to detect the liquid level, concentration and temperature of the urea solution in the urea tank, and the urea sensor has a liquid suction pipe through which the urea solution in the urea tank is sucked out. The SCR system first performs hydrolysis and pyrolysis reactions on the urea solution to generate ammonia gas NH3 and carbon dioxide CO2, and then uses ammonia gas NH3 to participate in the NOX reduction. However, this technology generates excess carbon dioxide CO2 gas, and the molecular structure of this gas is very stable and difficult to decompose.
[0003] If the liquid ammonia method is adopted, it supports ammonia gas to directly participate in the NOX reduction reaction of the SCR system, skipping the first step of hydrolysis and no longer generating carbon dioxide CO2. This not only shortens the reaction time and makes the tail gas purification more efficient, but also can alleviate the climate greenhouse effect once promoted. However, no one in the market focuses on the exploration, application and development in the field of ammonia gas directly participating in the automotive tail gas treatment system.
[0004] When using the liquid ammonia method to directly participate in automotive tail gas treatment with ammonia gas, a liquid ammonia tank is required to store liquid ammonia. Under standard atmospheric pressure, when the temperature of the liquid ammonia tank reaches the boiling point of -33.34°C, it vaporizes to form ammonia gas. Therefore, the liquid ammonia tank also needs to be equipped with sensors to control the liquid level, temperature, air pressure sensing and air pressure supply, gas path control and low-temperature boost of the liquid ammonia tank. However, most of the existing liquid ammonia sensors are of single structures such as liquid level detection, pressure detection or heating, and cannot be adapted to the exhaust gas treatment system that uses ammonia gas to directly participate in the SCR reaction. Although the existing multifunctional urea sensors in the market integrate liquid level, temperature and pressure measurement modules, the principle of the urea sensor is to suck out the urea solution in the urea tank through a liquid suction pipe, while the liquid ammonia sensor does not require a liquid suction pipe and needs to vaporize the liquid ammonia to form ammonia gas and transport the ammonia gas. Therefore, the existing multifunctional urea sensors cannot be directly converted into liquid ammonia sensors.
[0005] Therefore, it is necessary to provide at least a multifunctional liquid ammonia sensor that can effectively vaporize liquid ammonia and transport ammonia gas, and a tail gas treatment liquid ammonia device with the multifunctional liquid ammonia sensor. Summary of the Utility Model
[0006] The first object of the present utility model is to provide a multifunctional liquid ammonia sensor that can effectively vaporize liquid ammonia and transport ammonia gas.
[0007] The second object of the present utility model is to provide a tail gas treatment liquid ammonia device, which has a multifunctional liquid ammonia sensor that can vaporize liquid ammonia and transport ammonia gas.
[0008] To achieve the above first object, the present utility model provides a multifunctional liquid ammonia sensor, including a mounting member, a first on-off control valve, an air pipe joint, a heating pipe, a water inlet pipe joint module and a water outlet pipe joint module. The mounting member is used to connect with a liquid ammonia tank, and the mounting member is provided with a through mounting hole; the first on-off control valve is hermetically arranged in the mounting hole, one end of the first on-off control valve is connected to the air pipe joint, and the first on-off control valve is used to control the on-off between the inside of the liquid ammonia tank and the air pipe joint. The other end of the air pipe joint is used to connect with an ammonia gas pipeline; the water inlet end of the heating pipe penetrates through the mounting member and is connected to the water inlet pipe joint module, and the water outlet end of the heating pipe penetrates through the mounting member and is connected to the water outlet pipe joint module. The heating pipe is used to heat the liquid ammonia in the liquid ammonia tank.
[0009] Compared with the prior art, the multifunctional liquid ammonia sensor of the present utility model realizes the transportation of ammonia gas in the liquid ammonia tank by setting a mounting member installed on the liquid ammonia tank and opening a mounting hole in the mounting member. At the same time, by setting a first on-off control valve in the mounting hole and connecting the first on-off control valve to the air pipe joint, the on-off between the inside of the liquid ammonia tank and the air pipe joint is controlled by the first on-off control valve. When ammonia gas is needed to directly participate in the NOX reduction reaction of the SCR system, the first on-off control valve controls the communication between the inside of the liquid ammonia tank and the air pipe joint, so that the ammonia gas in the liquid ammonia tank can be transported out through the first on-off control valve and the air pipe joint. When ammonia gas is not needed, the on-off between the inside of the liquid ammonia tank and the air pipe joint can be controlled by the first on-off control valve, so as to stop transporting ammonia gas. In addition, the present utility model also sets a heating pipe, which can heat the liquid ammonia in the liquid ammonia tank, so that the liquid ammonia is heated up and effectively vaporized until the air pressure in the liquid ammonia tank reaches the standard range, thus solving the problem of inability to supply gas due to insufficient pressure at low temperature. Therefore, the multifunctional liquid ammonia sensor of the present utility model can effectively vaporize liquid ammonia and transport ammonia gas.
[0010] Preferably, the water inlet pipe joint module includes a water inlet pipe joint and a second on-off control valve. The second on-off control valve is connected between the water inlet pipe joint and the water inlet end of the heating pipe, and the second on-off control valve is used to control the on-off between the water inlet pipe joint and the water inlet end of the heating pipe.
[0011] Preferably, the multi-functional liquid ammonia sensor further includes a liquid level and temperature measurement module which is disposed through the mounting member, and the liquid level and temperature measurement module is used for detecting the liquid level and temperature of the liquid ammonia in the liquid ammonia tank.
[0012] Preferably, the multi-functional liquid ammonia sensor further includes a float which is sleeved on the liquid level and temperature measurement module in a vertically movable manner.
[0013] Preferably, the multi-functional liquid ammonia sensor further includes a limiting member which is disposed on the liquid level and temperature measurement module and is used for restricting the upward movement of the float.
[0014] Preferably, a connector for communication connection is disposed on the liquid level and temperature measurement module.
[0015] Preferably, a pressure measurement module for detecting the pressure in the liquid ammonia tank is disposed on the mounting member.
[0016] Preferably, the multi-functional liquid ammonia sensor further includes a bottom plate which is connected to the end of the heating pipe far away from the mounting member, and the bottom plate is used for connecting to the bottom of the liquid ammonia tank.
[0017] Preferably, the first on-off control valve is a solenoid valve, a manual control valve or a needle control valve.
[0018] To achieve the above second object, the present invention provides a tail gas treatment liquid ammonia device, which includes a liquid ammonia tank and the above multi-functional liquid ammonia sensor. An accommodating cavity with an opening is provided in the liquid ammonia tank, and the accommodating cavity is used for storing liquid ammonia. The mounting member is installed on the liquid ammonia tank and closes the opening of the accommodating cavity. The heating pipe extends into the accommodating cavity, and the first on-off control valve is used for controlling the on-off between the accommodating cavity and the gas pipe joint.
[0019] Compared with the prior art, the tail gas treatment liquid ammonia device of the present utility model is provided with a multi-functional liquid ammonia sensor. The multi-functional liquid ammonia sensor is installed on the liquid ammonia tank through an installation part, and an installation hole is opened in the installation part to facilitate the transportation of ammonia gas in the liquid ammonia tank. At the same time, a first on-off control valve is arranged in the installation hole, and the first on-off control valve is connected to the gas pipe joint. The first on-off control valve is used to control the on-off between the inside of the liquid ammonia tank and the gas pipe joint. When ammonia gas is needed to directly participate in the NOX reduction reaction of the SCR system, the first on-off control valve controls the accommodation cavity of the liquid ammonia tank to communicate with the gas pipe joint, so that the ammonia gas in the accommodation cavity of the liquid ammonia tank can be transported out through the first on-off control valve and the gas pipe joint. When ammonia gas is not needed, the first on-off control valve can be used to control the accommodation cavity of the liquid ammonia tank to be disconnected from the gas pipe joint, thereby stopping the transportation of ammonia gas. In addition, the present utility model also solves the problem of insufficient gas supply due to insufficient pressure at low temperature by arranging a heating pipeline, which can heat the liquid ammonia in the liquid ammonia tank, so that the liquid ammonia is heated and effectively vaporized until the air pressure in the liquid ammonia tank reaches the standard range. Therefore, the tail gas treatment liquid ammonia device of the present utility model can effectively vaporize liquid ammonia and transport ammonia gas. Brief Description of the Drawings
[0020] Figure 1 is a three-dimensional structure diagram of the multi-functional liquid ammonia sensor of the present utility model.
[0021] Figure 2 is an exploded view of the tail gas treatment liquid ammonia device of the present utility model.
[0022] Figure 3 is a structural diagram of the assembled tail gas treatment liquid ammonia device of the present utility model.
[0023] Figure 4 is an internal structural diagram of the tail gas treatment liquid ammonia device of the present utility model. Detailed Description of the Preferred Embodiments
[0024] In order to describe in detail the technical content and structural features of the present utility model, the following further description is made in conjunction with the embodiments and the accompanying drawings.
[0025] Please refer to Figures 1 to 4 , the tail gas treatment liquid ammonia device 200 of the present utility model includes a liquid ammonia tank 201 and a multi-functional liquid ammonia sensor 100.
[0026] Among them, the multifunctional liquid ammonia sensor 100 includes a mounting member 1, a first on-off control valve 2, a gas pipe joint 3, a heating pipe 4, an inlet water pipe joint module 5 and an outlet water pipe joint module 6. The mounting member 1 is used to connect with the liquid ammonia tank 201, and the mounting member 1 is provided with a through mounting hole; the first on-off control valve 2 is hermetically arranged in the mounting hole, and one end of the first on-off control valve 2 is connected to the gas pipe joint 3. The first on-off control valve 2 is used to control the on-off between the inside of the liquid ammonia tank 201 and the gas pipe joint 3, and the other end of the gas pipe joint 3 is used to connect with the ammonia gas pipeline; the water inlet end of the heating pipe 4 penetrates through the mounting member 1 and is connected to the inlet water pipe joint module 5, and the water outlet end of the heating pipe 4 penetrates through the mounting member 1 and is connected to the outlet water pipe joint module 6. The heating pipe 4 is used to heat the liquid ammonia in the liquid ammonia tank 201. Among them, the first on-off control valve 2 can adopt an existing solenoid valve structure. By electrically connecting the solenoid valve to the controller of the vehicle, the on-off of the first on-off control valve 2 can be electrically controlled, but it is not limited thereto. For example, the first on-off control valve 2 can also adopt an existing manual control valve or Needle-type control valve .
[0027] The liquid ammonia tank 201 is provided with a receiving cavity 201a with an opening. The receiving cavity 201a is used to store liquid ammonia. The mounting member 1 is installed on the liquid ammonia tank 201 and closes the opening of the receiving cavity 201a. The heating pipe 4 extends into the receiving cavity 201a. The first on-off control valve 2 is used to control the on-off between the receiving cavity 201a and the gas pipe joint 3. Further, the mounting member 1 is fixedly connected to the liquid ammonia tank 201 through bolts 11, and a sealing ring 202 is provided between the mounting member 1 and the opening of the receiving cavity 201a.
[0028] In the present utility model, the first on-off control valve 2 is arranged in the mounting hole, and the first on-off control valve 2 is connected to the gas pipe joint 3. The first on-off control valve 2 is used to control the on-off between the inside of the liquid ammonia tank 201 and the gas pipe joint 3. When ammonia gas is required to directly participate in the NOX reduction reaction of the SCR system, the first on-off control valve 2 controls the communication between the receiving cavity 201a of the liquid ammonia tank 201 and the gas pipe joint 3, so that the ammonia gas in the receiving cavity 201a of the liquid ammonia tank 201 can be transported out through the first on-off control valve 2 and the gas pipe joint 3. When ammonia gas is not needed, the first on-off control valve 2 can be used to control the disconnection between the receiving cavity 201a of the liquid ammonia tank 201 and the gas pipe joint 3, thereby stopping the transportation of ammonia gas.
[0029] Please refer to Figures 1 to 4, in one embodiment, the water inlet joint module 5 includes a water inlet joint 51 and a second on-off control valve 52. The second on-off control valve 52 is connected between the water inlet joint 51 and the water inlet end of the heating pipe 4. The second on-off control valve 52 is used to control the on-off between the water inlet joint 51 and the water inlet end of the heating pipe 4. The water inlet joint 51 can be connected to the water pipe of the vehicle engine. When the ambient temperature is lower than -40°C, the second on-off control valve 52 connects the water inlet joint 51 and the water inlet end of the heating pipe 4. The hot water of the engine enters the heating pipe 4 through the water pipe via the water inlet joint 51, thereby radiating heat to heat the liquid ammonia in the accommodation cavity 201a of the liquid ammonia tank 201, causing the liquid ammonia to heat up and vaporize until the air pressure in the liquid ammonia tank 201 reaches the standard range, thus solving the problem of insufficient gas supply due to insufficient pressure at low temperatures. Among them, the second on-off control valve 52 can adopt an existing solenoid valve structure. By electrically connecting the solenoid valve to the vehicle controller, the on-off of the second on-off control valve 52 can be electronically controlled, but it is not limited thereto. For example, the second on-off control valve 52 can also adopt an existing manual control valve.
[0030] Please refer to Figure 1 and Figure 4 , in one embodiment, the multi-functional liquid ammonia sensor 100 further includes a liquid level and temperature measurement module 7. The liquid level and temperature measurement module 7 is disposed through the mounting member 1. The liquid level and temperature measurement module 7 is used to detect the liquid level and temperature of the liquid ammonia in the liquid ammonia tank 201. Further, the multi-functional liquid ammonia sensor 100 further includes a float 71. The float 71 is sleeved on the liquid level and temperature measurement module 7 in a vertically floating manner. The float 71 can float on the liquid ammonia surface in the accommodation cavity 201a of the liquid ammonia tank 201. Even further, the multi-functional liquid ammonia sensor 100 further includes a limiting member 72. The limiting member 72 is disposed on the liquid level and temperature measurement module 7 and is used to limit the upward movement of the float 71.
[0031] Please refer to Figure 1 and Figure 4 , in one embodiment, a connector 73 for communication connection is provided on the liquid level and temperature measurement module 7. Among them, the liquid level and temperature measurement module 7 can be electrically connected to the vehicle controller through the connector 73, so as to feedback the detected liquid ammonia level information and temperature information to the controller, so that the controller can perform corresponding operation control.
[0032] Please refer to Figure 1 , in one embodiment, a pressure measurement module 8 for detecting the pressure in the liquid ammonia tank 201 is provided on the mounting member 1. By detecting the pressure in the liquid ammonia tank 201 through the pressure measurement module 8, the pressure information in the liquid ammonia tank 201 can be understood and mastered in real time. Among them, the pressure measurement module 8 can be electrically connected to the vehicle controller, so as to feedback the detected pressure information of the liquid ammonia tank 201 to the controller, so that the controller can perform corresponding operation control.
[0033] Please refer to Figure 1 and Figure 4 In one embodiment, the multi-functional liquid ammonia sensor 100 further includes a bottom plate 9, which is connected to the end of the heating pipe 4 away from the mounting member 1, and the bottom plate 9 is used to connect to the bottom of the liquid ammonia tank 201. Specifically, one end of the liquid level and temperature measurement module 7 is inserted into the bottom plate 9, so as to realize the stable positioning of the liquid level and temperature measurement module 7. More specifically, the bottom plate 9 is connected to the heating pipe 4 through a connecting piece 91. Further, a support pad 92 is provided at the bottom of the bottom plate 9, and the support pad 92 is used to connect to the bottom of the liquid ammonia tank 201, so as to improve the anti-vibration ability.
[0034] Combined with Figures 1 to 4 The specific working principle of the tail gas treatment liquid ammonia device 200 of the present utility model is as follows:
[0035] Under standard atmospheric pressure, when the temperature of the liquid ammonia tank 201 reaches the boiling point of liquid ammonia, -33.34 °C, the liquid ammonia in the accommodating cavity 201a gasifies to form ammonia gas. The liquid level and temperature measurement module 7 of the multi-functional liquid ammonia sensor 100 real-time monitors the liquid level and temperature of the liquid ammonia in the liquid ammonia tank 201, and the pressure measurement module 8 real-time monitors the pressure in the liquid ammonia tank 201. The controller timely turns on the refrigeration device of the liquid ammonia tank 201 (the liquid ammonia tank 201 is equipped with a refrigeration device) according to the pressure and temperature signals, and keeps the air pressure in the accommodating cavity 201a of the liquid ammonia tank 201 at about 2.5 Mpa. The first on-off control valve 2 controls the communication between the accommodating cavity 201a of the liquid ammonia tank 201 and the gas pipe joint 3, so that the ammonia gas in the accommodating cavity 201a of the liquid ammonia tank 201 can be transported out through the first on-off control valve 2 and the gas pipe joint 3.
[0036] The multi-functional liquid ammonia sensor 100 also has the function of heating liquid ammonia. The water inlet joint 51 is connected to the water inlet end of the heating pipe 4 through the second on-off control valve 52, and the hot water of the engine enters the heating pipe 4 through the water pipe via the water inlet joint 51, so as to radiate heat to heat the liquid ammonia in the accommodating cavity 201a of the liquid ammonia tank 201, so that the liquid ammonia is heated and gasified until the air pressure in the liquid ammonia tank 201 reaches the standard range.
[0037] In summary, the tail gas treatment liquid ammonia device 200 of the present utility model is provided with a multi-functional liquid ammonia sensor 100. The multi-functional liquid ammonia sensor 100 controls the on-off between the inside of the liquid ammonia tank 201 and the gas pipe joint 3 by setting a first on-off control valve 2. When ammonia is required to directly participate in the NOX reduction reaction of the SCR system, the first on-off control valve 2 controls the communication between the accommodation cavity 201a of the liquid ammonia tank 201 and the gas pipe joint 3, so that the ammonia in the accommodation cavity 201a of the liquid ammonia tank 201 can be transported out through the first on-off control valve 2 and the gas pipe joint 3. The present utility model also sets a heating pipe 4, and the liquid ammonia in the liquid ammonia tank 201 can be heated by using the heating pipe 4, so that the liquid ammonia is heated up and effectively vaporized until the air pressure in the liquid ammonia tank 201 reaches the standard range, thereby solving the problem of inability to supply gas due to insufficient pressure at low temperature. Therefore, the tail gas treatment liquid ammonia device 200 of the present utility model can effectively vaporize the liquid ammonia and transport ammonia. Secondly, the multi-functional liquid ammonia sensor 100 of the present utility model integrates the functions of liquid level, temperature and pressure measurement, and has the characteristics of simple structure and smaller occupied space. Moreover, the multi-functional liquid ammonia sensor 100 of the present utility model can adjust the air pressure in the liquid ammonia tank 201 by setting two control valves, namely a first on-off control valve 2 and a second on-off control valve 52.
[0038] The above-disclosed are only the preferred embodiments of the present utility model, and the scope of rights of the present utility model cannot be limited thereby. Therefore, all equivalent changes made according to the claims of the present utility model fall within the scope covered by the present utility model.
Claims
1. A multifunctional liquid ammonia sensor, characterized in that, It includes a mounting piece, a first on-off control valve, a gas pipe joint, a heating pipe, an inlet water pipe joint module and an outlet water pipe joint module. The mounting piece is used to connect with the liquid ammonia tank, and the mounting piece is provided with a through mounting hole; the first on-off control valve is hermetically arranged in the mounting hole, one end of the first on-off control valve is connected with the gas pipe joint, and the first on-off control valve is used to control the on-off between the inside of the liquid ammonia tank and the gas pipe joint. The other end of the gas pipe joint is used to connect with the ammonia gas pipeline; the water inlet end of the heating pipe penetrates through the mounting piece and is connected with the inlet water pipe joint module, and the water outlet end of the heating pipe penetrates through the mounting piece and is connected with the outlet water pipe joint module. The heating pipe is used to heat the liquid ammonia in the liquid ammonia tank.
2. The multifunctional liquid ammonia sensor according to claim 1, wherein The inlet water pipe joint module includes an inlet water pipe joint and a second on-off control valve. The second on-off control valve is connected between the inlet water pipe joint and the water inlet end of the heating pipe, and the second on-off control valve is used to control the on-off between the inlet water pipe joint and the water inlet end of the heating pipe.
3. The multifunctional liquid ammonia sensor according to claim 1, wherein, It further includes a liquid level and temperature measurement module. The liquid level and temperature measurement module penetrates through the mounting piece, and the liquid level and temperature measurement module is used to detect the liquid level and temperature of the liquid ammonia in the liquid ammonia tank.
4. The multifunctional liquid ammonia sensor according to claim 3, characterized in that, It further includes a float. The float is sleeved on the liquid level and temperature measurement module in a vertically floating manner.
5. The multifunctional liquid ammonia sensor according to claim 4, characterized in that, It further includes a limiting piece. The limiting piece is arranged on the liquid level and temperature measurement module and is used to limit the upward movement of the float.
6. The multifunctional liquid ammonia sensor according to claim 3, characterized in that The liquid level and temperature measurement module is provided with a connector for communication connection.
7. The multifunctional liquid ammonia sensor according to claim 1, characterized in that, The mounting piece is provided with a pressure measurement module for detecting the pressure in the liquid ammonia tank.
8. The multifunctional liquid ammonia sensor according to claim 1, wherein, It further includes a bottom plate. The bottom plate is connected to the end position of the heating pipe away from the mounting piece, and the bottom plate is used to connect to the bottom of the liquid ammonia tank.
9. The multifunctional liquid ammonia sensor according to claim 1, wherein The first on-off control valve is an electromagnetic valve, a manual control valve or a needle valve.
10. A tail gas treatment liquid ammonia device, characterized in that, It includes a liquid ammonia tank and the multifunctional liquid ammonia sensor according to any one of claims 1-9. The liquid ammonia tank is provided with a containing cavity with an opening. The containing cavity is used to store liquid ammonia. The mounting piece is installed on the liquid ammonia tank and closes the opening of the containing cavity. The heating pipe extends into the containing cavity, and the first on-off control valve is used to control the on-off between the containing cavity and the gas pipe joint.