Automatic collection system and method for synthetic ammonia

Abstract

The invention provides an automatic collection system and method for synthetic ammonia. The automatic collection system comprises a gas injection device, a liquid injection device, a collection device and a control device. The collecting device comprises a sampling platform and a plurality of sampling pipes, each sampling pipe is used for being communicated with the gas injection device and the liquid injection device so as to receive the ammonia gas injected by the gas injection device and the absorption liquid injected by the liquid injection device, and the ammonia gas is dissolved in the absorption liquid. The control device controls the liquid pump to be in a first working state, so that the absorption liquid in the liquid storage tank flows out of the liquid injection pipe in a first preset duration and a first preset flow; and controlling the multi-way valve to be in a second working state, so that the ammonia gas flows out from a gas passage communicated with the sampling pipe at a second preset time length and a second preset flow. According to the device provided by the invention, the problems of low sampling efficiency and limited data accuracy caused by traditional manual sampling of ammonia gas are solved.

Description

Technical Field

[0001] The present application relates to the technical field of synthetic ammonia collection, and in particular to a synthetic ammonia automatic collection system and method. Background Art

[0002] Ammonia (NH3) is an excellent hydrogen storage medium. At the same time, ammonia has a wide range of liquefaction conditions, which makes it easy to store and transport. It can also release hydrogen efficiently through catalytic cracking or decomposition. In the industrial production of synthetic ammonia, the detection of ammonia concentration is an important means to monitor reaction efficiency and adjust process parameters. In the ammonia synthesis system, the ammonia product is dissolved by absorption, utilizing the property of ammonia being easily soluble in water or other absorption liquids, and an ammonia sample is extracted from the reaction product stream of ammonia synthesis. The sampling tube is then sent to the laboratory, and the ammonia in the absorption liquid is analyzed by chemical reaction or physical detection methods to obtain the ammonia concentration, so as to achieve accurate monitoring of the ammonia content in the industrial process or environment.

[0003] In the process of collecting synthetic ammonia by absorption method, each sampling tube needs to be manually added with absorption liquid and the amount of addition needs to be recorded. At the same time, the number of each sampling tube and the corresponding sampling batch need to be manually recorded. It is also necessary to manually control the introduction of synthetic ammonia product gas and record the ventilation time of each group of product gas. It can be seen that manual sampling to obtain ammonia samples is only suitable for sampling needs with low sampling frequency, and there are many disadvantages such as inaccurate addition of absorption liquid, inaccurate sampling time, and high labor costs. It cannot meet the sampling needs of industrial synthetic ammonia product sampling and analysis or laboratory synthetic ammonia analysis and testing with high sampling frequency and precise data requirements.

[0004] Automated sampling technology has been applied to many industrial fields, and the sampling objects are pollutants in the air, polluted rivers, industrial water quality, industrial dust, etc. However, the high toxicity, high volatility and high solubility of ammonia in the ammonia synthesis system require special sealing and handling measures. Conventional automatic sampling devices are not well adapted to the characteristics of ammonia and are incompatible with process conditions. Therefore, there is currently no standardized proprietary solution for automatic sampling of synthetic ammonia in the industry. Experimenters still rely on traditional manual sampling, which has low sampling efficiency and limited data accuracy. Summary of the invention

[0005] In view of the above problems, one of the purposes of the present invention is to provide an automatic synthetic ammonia collection system to solve the problems of low sampling efficiency and limited data accuracy caused by traditional manual sampling of ammonia. The second purpose of the present invention is to provide an automatic synthetic ammonia collection method.

[0006] To achieve one of the objectives, the first aspect of the present invention provides an automatic collection system for synthetic ammonia, the technical solution adopted is: A synthetic ammonia automatic collection system, the system comprising: A gas injection device, comprising a multi-way valve and at least one gas passage, wherein the gas injection device is used to communicate with the synthetic ammonia system to receive and distribute ammonia gas discharged from the synthetic ammonia system; The liquid injection device comprises a liquid storage tank, a liquid pump and a liquid injection pipe which are connected in sequence, wherein the liquid storage tank stores absorption liquid; A collection device, comprising a sampling platform and a plurality of sampling tubes installed on the sampling platform, each of the sampling tubes being used to communicate with one of the gas passages and the liquid injection tube, respectively, to receive the ammonia gas injected by the gas injection device and the absorption liquid injected by the liquid injection device, so that the ammonia gas is dissolved in the absorption liquid; A control device, connected to the multi-way valve and the liquid pump, respectively, for: Controlling the liquid pump to be in a first working state, so that the absorption liquid in the liquid storage tank flows out from the liquid injection pipe at a first preset time length and a first preset flow rate; and, The multi-way valve is controlled to be in a second working state, so that the ammonia gas flows out from the gas passage connected to the sampling tube at a second preset time length and a second preset flow rate.

[0007] Optionally, a sand plate air guide tube is provided at the outlet of the gas passage connected to the sampling tube.

[0008] Optionally, the system further comprises: A rotating mechanism, comprising a first driving motor and a rotating shaft connected to each other, wherein the rotating shaft is connected to the sampling platform; Wherein, the control device is connected to the first drive motor and is used to: The first driving motor is controlled to drive the rotating shaft to rotate in a preset motion mode, thereby driving the sampling platform to rotate, so that the position of the sampling tube is opposite to the position of the injection tube, or the position of the sampling tube is opposite to the position of the sand plate air guide tube.

[0009] Optionally, the system further comprises: The lifting mechanism comprises a second driving motor, a lifting rod and a carrying plate, wherein the second driving motor is drivingly connected to the lifting rod, both ends of the lifting rod are connected to the carrying plate, and the rotating mechanism is arranged on the carrying plate; Wherein, the control device is connected to the second drive motor and is used for: The second driving motor is controlled to drive the lifting rod to move up and down, thereby driving the sampling platform to switch between a first height position and a second height position; wherein the first height position is lower than the second height position.

[0010] Optionally, the control device is further used for: When the sampling platform is at the first height position, controlling the first driving motor to drive the sampling platform to rotate; When the position of the sampling tube is opposite to the position of the injection tube, controlling the second driving motor to drive the sampling platform to move from the first height position to the second height position; and When the position of the sampling tube is opposite to the position of the sand plate air guide tube, the second driving motor is controlled to drive the sampling platform to the second height position.

[0011] Optionally, the system further comprises: The base is provided with the liquid injection pipe and the sand plate air guide pipe on the base and is located above the sampling platform.

[0012] Optionally, the sampling platform is circular, and has a plurality of mounting holes in a circumferential array on the sampling platform, and each mounting hole is clamped to each sampling tube.

[0013] Optionally, the sampling platform includes an upper mounting plate and a lower mounting plate connected to each other, the upper mounting plate is provided with a plurality of through holes, the lower mounting plate is provided with a plurality of slots, and each sampling tube axially passes through each of the through holes and is snapped into each of the slots.

[0014] To achieve the second purpose, the second aspect of the present invention provides a method for automatically collecting synthetic ammonia, and the technical solution adopted is: A method for automatically collecting synthetic ammonia, relying on the automatic collecting system for synthetic ammonia provided by the first aspect of the present invention, the method comprises: In response to a collection instruction input by a user, the liquid pump is controlled to be in a first working state, so that the absorption liquid in the liquid storage tank flows from the liquid injection pipe to the sampling pipe on the sampling platform at a first preset time and a first preset flow rate; The multi-way valve is controlled to be in a second working state, so that ammonia gas flows from the gas passage connected to the sampling tube to the sampling tube injected with the absorption liquid on the sampling platform at a second preset time and a second preset flow rate, thereby realizing automatic collection of the ammonia gas.

[0015] Compared with the prior art, this application has the following significant improvements: The device provided by the embodiment of the present invention includes: a gas injection device, including a multi-way valve and at least one gas passage, the gas injection device is used to communicate with the synthetic ammonia system to receive and distribute the ammonia discharged from the synthetic ammonia system; a liquid injection device, including a liquid storage tank, a liquid pump and a liquid injection pipe that are connected in sequence, and the liquid storage tank stores an absorption liquid; a collection device, including a sampling platform and a plurality of sampling tubes installed on the sampling platform, each of the sampling tubes is respectively connected to one of the gas passages and the liquid injection pipe to receive the ammonia injected by the gas injection device and the absorption liquid injected by the liquid injection device, so that the ammonia is dissolved in the absorption liquid; a control device, which is respectively connected to the multi-way valve and the liquid pump, and is used to: control the liquid pump to be in a first working state, so that the absorption liquid in the liquid storage tank flows out from the liquid injection pipe at a first preset time and a first preset flow rate; and control the multi-way valve to be in a second working state, so that the ammonia flows out from the gas passage connected to the sampling tube at a second preset time and a second preset flow rate.

[0016] By adopting the technical solution of the present invention, the system is designed for the automatic sampling requirements of the synthetic ammonia system, and the sampling is optimized based on the liquid absorption method. The manual operation is replaced by automated equipment, which greatly improves the sampling efficiency, reduces the dependence on manual operation, and reduces the labor cost; at the same time, it realizes timed and quantitative continuous sampling, greatly improves the work efficiency, and is particularly suitable for high-frequency sampling requirements; the magnetic control valve can control multiple gas passages at the same time, which is suitable for quantitative testing of multi-channel synthetic ammonia systems, and enhances the flexibility and applicability of the system; the control system controls the liquid injection device to inject liquid at a fixed time and quantity, and controls the gas injection device to inject gas at a fixed time and quantity, and the dual control mechanism ensures that the sampling conditions of each sampling tube are consistent (that is, the liquid injection amount and gas injection amount of each sampling are completely consistent), avoids the problems of inaccurate addition of absorption liquid and / or gas, inaccurate time control, and improves the accuracy and reliability of subsequent test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 This is a schematic diagram of the process flow of the automatic collection system for synthetic ammonia according to an embodiment of the present application; Figure 2 It is a schematic diagram of the composition structure of the gas injection device according to one embodiment of the present application; Figure 3 It is a schematic diagram of the composition structure of the liquid injection device according to one embodiment of the present application; Figure 4 It is a schematic diagram of the overall structure of the automatic collection system for synthetic ammonia according to one embodiment of the present application; Figure 5 It is a flow chart of the steps of the automatic collection method of synthetic ammonia described in one embodiment of the present application.

[0019] Description of reference numerals: 1. Air inlet pipeline; 2. Air outlet pipeline; 3. Detection pipeline; 4. Multi-way valve; 5. Liquid storage tank; 6. Liquid pump; 7. Liquid injection pipe; 8. Sampling platform; 9. Sampling tube; 10. Rotating shaft; 11. First drive motor; 12. Second drive motor; 13. Lifting rod; 14. Sand plate air guide pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] like Figure 1 As shown, Figure 1 The schematic diagram of the process principle of the automatic collection system of synthetic ammonia of the present invention is shown, which is an automatic collection system of synthetic ammonia, a gas injection device, including a multi-way valve 4 and at least one gas passage, the gas injection device is used to communicate with the synthetic ammonia system to receive and distribute ammonia discharged from the synthetic ammonia system; a liquid injection device, including a liquid storage tank 5, a liquid pump 6 and a liquid injection pipe 7 connected in sequence, and the liquid storage tank 5 stores absorption liquid; a collection device, including a sampling platform 8 and a plurality of sampling pipes 9 installed on the sampling platform 8, each sampling pipe 9 is used to communicate with a gas passage and the liquid injection pipe 7 respectively, to receive ammonia injected by the gas injection device and absorption liquid injected by the liquid injection device, so that the ammonia is dissolved in the absorption liquid; a control device, respectively connected to the multi-way valve 4 and the liquid pump 6, for: The liquid pump 6 is controlled to be in the first working state, so that the absorption liquid in the liquid storage tank 5 flows out from the injection pipe 7 at a first preset time and a first preset flow rate; and the multi-way valve 4 is controlled to be in the second working state, so that the ammonia gas flows out from the gas passage connected to the sampling pipe 9 at a second preset time and a second preset flow rate.

[0022] Specifically, if Figure 2The composition structure diagram of the gas injection device is shown. The gas injection device is connected to the outlet of the synthetic ammonia system to collect ammonia from the synthetic ammonia system. And the ammonia is guided to the collection device through the multi-way valve 4 and the gas passage. It can be known that the multi-way valve 4 has multiple outlets, and the gas flow direction is changed by controlling the movement or rotation of the valve, so as to realize the opening and closing of different gas passages. Among them, one of the multiple gas passages is directly connected to the sampling tube 9 of the collection device, and the gas passage is named as the detection pipeline 3 below, and the remaining gas passages can be connected to different objects respectively to realize the different uses of ammonia. Therefore, by connecting the multi-way valve 4 with multiple gas passages, the valve position of the multi-way valve 4 can be switched to open and close different gas passages to control the flow direction of ammonia. When there is a detection demand, the ammonia is introduced into the sampling tube 9 of the collection device through the detection pipeline 3 through the multi-way valve 4 for sampling and analysis of ammonia. When there is no detection demand, the ammonia can be discharged through other gas passages through the multi-way valve 4, without affecting the subsequent processing steps of the synthetic ammonia system.

[0023] In some embodiments, two gas passages may be provided, and the other gas passage serves as an outlet pipe 2 to discharge ammonia gas to a tail gas treatment system for treating waste gas during normal operation of the ammonia synthesis system.

[0024] In some embodiments, when there is a need for detection, the detection pipeline 3 and the gas outlet pipeline 2 can be opened at the same time, so that part of the ammonia flows to the detection pipeline 3 for sampling and analysis, and the other part flows to the gas outlet pipeline 2 for collection. In this embodiment, a flow sensor can be provided on the detection pipeline 3 to detect the flow of ammonia passing through the detection pipeline 3.

[0025] It can be known that the outlet of the synthetic ammonia system is usually equipped with a flow sensor. Therefore, when the detection pipeline 3 is flowing and the gas outlet pipeline 2 is disconnected, the flow rate of ammonia passing through the detection pipeline 3 can be grasped by the flow sensor of the synthetic ammonia system.

[0026] In some embodiments, a three-way valve, a four-way valve, a five-way valve, etc. can be selected according to the number of gas passages. Among them, the multi-way valve 4 can be selected from an electric multi-way valve 4, a magnetically controlled multi-way valve 4, or a hydraulic multi-way valve 4. In this embodiment, the multi-way valve 4 is selected as a magnetically controlled valve, which uses magnetic force to realize the opening of the valve, and has a fast response speed, so as to quickly respond to the flow parameter control of the ammonia gas in the gas passage.

[0027] Among them, Figure 3The schematic diagram of the composition structure of the liquid injection device is shown. The liquid injection device guides the absorption liquid to the collection device through the liquid storage tank 5, the liquid pump 6 and the liquid injection tube 7. The liquid storage tank 5 stores the absorption liquid, and the absorption liquid can be a sulfuric acid solution. The liquid pump 6 is arranged on the liquid pipeline, and the liquid pipeline is connected to the liquid storage tank 5 and the liquid injection tube 7 respectively, so that the absorption liquid is pumped to the liquid injection tube 7 through the liquid pipeline by the liquid pump 6, and injected into the sampling tube 9 through the liquid injection tube 7.

[0028] In some embodiments, the liquid pump 6 may include any one of a plunger pump, a diaphragm pump, a gear pump and a peristaltic pump. Preferably, the present embodiment uses a peristaltic pump to be suitable for the delivery of sulfuric acid solution. Optionally, the flow rate of the peristaltic pump ranges from 10ml to 100ml with an accuracy of ±0.1mL. The liquid outlet of the peristaltic pump is connected to the injection tube 7, and the injection tube 7 may be a stainless steel filling needle.

[0029] Among them, Figure 4 The overall structural diagram of the automatic collection system for synthetic ammonia is shown. The collection device includes a sampling platform 8 and a plurality of sampling tubes 9. The sampling platform 8 is used to install the plurality of sampling tubes 9. The top of each sampling tube 9 is opened in the middle. Each sampling tube 9 receives the absorption liquid and ammonia gas successively through the top opening, so that the ammonia gas is dissolved in the absorption liquid during the sampling process, thereby realizing the sampling of the ammonia sample to facilitate subsequent detection.

[0030] Among them, the control device is responsible for managing the entire sampling process. The control device is specifically a PLC (Programmable Logic Controller). The working status of the control liquid pump 6 and the multi-way valve 4 is judged and executed by the PLC. PLC is a controller dedicated to industrial automation. In the synthetic ammonia system, PLC can control and monitor various equipment, dispatch and coordinate the operation of various subsystems. After receiving the control signal from the PLC, the execution unit of the subsystem is responsible for controlling the production and transmission of ammonia, such as the switching and control of equipment such as valves, pumps, and pipelines. In this embodiment, the collection system is integrated into the PLC, and the coordinated control of components such as the multi-way valve 4, peristaltic pump, rotating mechanism, and lifting mechanism controlled by the PLC is realized to realize the continuous, timed, and quantitative automatic collection of ammonia products.

[0031] In this embodiment, the PLC controls the valve position, opening time and valve opening of the multi-way valve 4, thereby controlling the ammonia gas to flow out of the detection pipeline 3 from the second preset time and the second preset flow rate. The PLC controls the operation speed and injection time of the liquid pump 6, thereby controlling the absorption liquid to flow out of the liquid pipeline at the first preset time and the first preset flow rate. At the same time, the PLC can automatically record data such as sampling time, absorption liquid dosage, and ammonia gas intake, which is convenient for subsequent analysis and management.

[0032] When the multi-way valve 4 is in the first working state, that is, the operating speed of the liquid pump 6 (peristaltic pump) is at the target speed, the injection time is the target time, and in this working state, the absorption liquid flows at the first preset time and the first preset flow rate, so that the absorption liquid is injected into each sampling tube 9 with the same content each time during the injection process. When the multi-way valve 4 is in the second working state, that is, the valve position of the multi-way valve 4 is at the target position, the gas injection time is the target time, and the valve opening is the target opening. In this working state, ammonia flows at the second preset time and the second preset flow rate, so that ammonia is injected into each sampling tube 9 with the same content each time during the injection process. Optionally, the gas injection time is 1min-60min.

[0033] Specifically, the control system receives in real time the real-time flow parameters transmitted by the flow sensor configured at the outlet of the synthetic ammonia system, thereby controlling the valve opening of the multi-way valve 4 to control the flow of ammonia to be the second preset flow.

[0034] The first preset time and the second preset time are values ​​set by the experimenter according to the required liquid injection content and gas injection content, and this embodiment does not limit this. When the first preset time reaches the preset value, the injection of the absorption liquid is automatically stopped, and when the second preset time reaches the preset value, the injection of ammonia is automatically stopped.

[0035] In the present embodiment, the first working state and the second working state also include a start-up time, and the start-up time of the liquid pump 6 precedes the start-up time of the multi-way valve 4. The control device starts the liquid pump 6 first and then starts the multi-way valve 4 according to the instructions set by the user, so as to automatically inject liquid first and then gas. Specifically, the execution sequence logic is set in the PLC program, and the PLC first sends a signal to start the liquid pump 6 according to the sampling instruction output by the user to ensure that the absorption liquid is injected into the sampling tube 9. When the injection time of the liquid pump 6 is reached, it is deemed that the liquid pump 6 has completed the injection task, and the PLC starts the multi-way valve 4 to introduce ammonia into the sampling tube 9. Therefore, the absorption liquid is injected first to ensure that the sampling tube 9 is filled with a sufficient amount of absorption liquid, and then the ammonia is introduced to prevent ammonia leakage or ammonia volatilization loss caused by the absence of liquid in the sampling tube 9 during the sampling process, thereby ensuring the safety of the system.

[0036] In this embodiment, multiple sampling can be performed, that is, after a sampling tube 9 is sampled, after a certain interval, the multi-way valve 4 and the liquid pump 6 are started again to collect ammonia samples of the same synthetic ammonia system at different time periods, so as to dynamically monitor the production status of each system. Among them, the next collection can be manually started by the experimenter through the PLC, or it can be automatically started by the PLC system. In the automatic start mode, the interval time from the completion of the sampling of the previous sampling tube 9 to the start of the sampling of the next sampling tube 9 can be pre-set in the PLC.

[0037] In summary, this system is designed for the automatic sampling needs of the synthetic ammonia system. It optimizes sampling based on the liquid absorption method, replaces manual operation with automated equipment, greatly improves sampling efficiency, reduces dependence on manual operation, and reduces labor costs; realizes timed and quantitative continuous sampling, greatly improves work efficiency, and is especially suitable for high-frequency sampling needs; the magnetic control valve can control multiple gas passages at the same time, which is suitable for quantitative testing of multi-channel synthetic ammonia systems, and enhances the flexibility and applicability of the system; the control system controls the liquid injection device to inject liquid at a fixed time and quantity, and controls the gas injection device to inject gas at a fixed time and quantity, and the dual control mechanism ensures that the sampling conditions of each sampling tube 9 are consistent (that is, the liquid injection amount and gas injection amount of each sampling are completely consistent), avoiding problems such as inaccurate addition of absorption liquid and / or gas, inaccurate time control, and improving the accuracy and reliability of subsequent test results. In this way, through the coordinated work of the multi-way valve 4, the liquid pump 6 and the control device, the standardization, automation and safety of sampling are realized, filling the gap in the industry, and is suitable for industrial synthetic ammonia product analysis and laboratory research.

[0038] Preferably, a plurality of gas injection devices are provided, and the plurality of gas injection devices are used to connect different synthetic ammonia systems; wherein each gas injection device includes a three-way valve and two gas passages, the three-way valve includes an inlet and two outlets, the two gas passages are specifically a detection pipeline 3 and an outlet pipeline 2, the inlet of the three-way valve is connected to the corresponding synthetic ammonia system through the air inlet pipeline 1, and the two outlets of the three-way valve are respectively connected to the detection pipeline 3 and the outlet pipeline 2, and control the on-off of the detection pipeline 3 and the outlet pipeline 2; wherein the outlet pipeline 2 is used to be connected to the exhaust gas treatment system, and the detection pipeline 3 is connected to the sampling pipe 9.

[0039] In this embodiment, each gas injection device is equipped with an independent three-way valve and two gas passages, so that the system can sample ammonia produced by different synthetic ammonia systems respectively, and each detection pipeline 3 is connected to a sampling tube 9, thereby realizing multi-channel collection of ammonia produced by multiple synthetic ammonia systems under different process conditions (such as raw material ratio, pressure, temperature, gas composition, etc.). During the non-sampling period, the valve of the three-way valve moves to connect the inlet with the outlet of the corresponding gas outlet pipeline 2, and at the same time cuts off the connection between the inlet and the outlet of the corresponding detection pipeline 3, and the synthetic ammonia product gas directly enters the tail gas treatment system through the gas outlet pipeline 2 without interfering with normal production. During sampling, the outlet of the three-way valve corresponding to the gas outlet pipeline 2 is closed, and the outlet of the corresponding detection pipeline 3 is opened, and the system automatically switches to the detection pipeline 3 to introduce ammonia into the sampling tube 9 for sampling and analysis.

[0040] Among them, multiple gas injection devices can work at the same time, respectively receiving ammonia output from different synthetic ammonia systems, and guiding different ammonia samples to different sampling tubes 9 of the collection device. The gas flow pressure resistance range of each gas path is 0-1MPa. Therefore, each sampling path of this system is independent, and supports multiple groups of sampling tubes 9 to work at the same time. It can collect ammonia samples of different concentrations, components and properties, meet the sampling requirements of different synthetic ammonia systems, and is suitable for large-scale sampling. At the same time, it ensures that the tail gas treatment and sampling process do not interfere with each other. This not only improves the efficiency and accuracy of sampling, but also provides support for the comprehensive analysis and optimization of ammonia concentrations from different sources.

[0041] As an improvement of this embodiment, a sand plate air guide tube 14 is provided at the outlet of the detection pipeline 3. The sand plate air guide tube 14 has a porous feature and is made of corrosion-resistant and high-temperature-resistant metal or synthetic material, and can be inserted into the sampling tube 9 and located in the absorption liquid. Therefore, the ammonia gas transmitted from the detection pipeline 3 is injected into the absorption liquid of the sampling tube 9 through the sand plate air guide tube 14. The porous feature evenly distributes the ammonia gas in the absorption liquid to form dispersed small bubbles, thereby increasing the contact area and time between the ammonia gas and the absorption liquid and promoting the dissolution efficiency.

[0042] In this embodiment, the first drive motor 11 is rotationally connected to the rotating shaft 10 through a coupling, and the rotating shaft 10 is fixedly connected to the sampling platform 8. The first drive motor 11 provides rotational power, controls the rotation angle and speed of the rotating shaft 10, and drives the sampling platform 8 to rotate to different angles at a certain speed through the rotating shaft 10, so that the sampling tube 9 fixed on the sampling platform 8 is in different positions. When the sampling platform 8 rotates to the position of the sampling tube 9 on it and the injection tube 7, it can ensure that the absorption liquid is smoothly injected into the sampling tube 9. When the sampling platform 8 rotates to the position of the sampling tube 9 on it and the sand plate air guide tube 14, it can ensure that ammonia is smoothly injected into the sampling tube 9.

[0043] Among them, the PLC controls the rotation direction, rotation speed and rotation angle of the first drive motor 11, drives the sampling tube 9 to the liquid injection position, aligns the sampling tube 9 with the position of the liquid injection tube 7, and starts the liquid injection mode; drives the sampling tube 9 to the gas injection position again, aligns the sampling tube 9 with the position of the sand plate air guide tube 14, and starts the gas injection mode, wherein the liquid injection position and the gas injection position are different. Therefore, on a fixed platform, different sampling tubes 9 are automatically switched to the liquid injection or gas injection position through the rotating mechanism, avoiding the manual movement of the position of the sampling tube 9, improving the efficiency of automated sampling, and automatically and accurately aligning the liquid injection and gas injection positions, avoiding the waste of absorption liquid and the leakage of ammonia, and ensuring the safety and stability of sampling.

[0044] As a specific explanation of this embodiment, the system also includes: a base, a liquid injection tube 7 and a sand plate air guide tube 14 are arranged on the base, and are located above the sampling platform 8. The base is an inverted L-shape, including a vertical plate extending vertically and a horizontal plate extending horizontally, the vertical plate is adjacent to the sampling platform 8 and installed on the ground, the horizontal plate connected to the vertical plate is located above the sampling platform 8, and the liquid injection tube 7 and the sand plate air guide tube 14 penetrate the horizontal plate, extend toward the sampling platform 8, and are both at a distance from the sampling tube 9 on the sampling platform 8.

[0045] The sampling platform 8 is circular, and a plurality of mounting holes are arranged in a circular array on the sampling platform 8, and each mounting hole is clamped with each sampling tube 9. There is a certain unit angle between two adjacent sampling tubes 9 on the disc-type sampling platform 8, and the unit angle is 360° divided by the number of sampling tubes 9. The unit angle is preferably 15°. The injection tube 7 and the sand plate air guide tube 14 are arranged on the horizontal plate at the same angle as the unit angle of the sampling tube 9, and are directly opposite the sampling tube 9. Therefore, each time the sampling tube 9 rotates one unit angle, the position of the latter sampling tube 9 is at the position of the former sampling tube 9, and each sampling tube 9 is aligned with the injection tube 7 or the sand plate air guide tube 14.

[0046] The preset motion mode includes a continuous sampling mode, an alternating sampling mode or a batch sampling mode.

[0047] The continuous sampling mode is that the first drive motor 11 rotates 360° clockwise, so that each sampling tube 9 on the sampling platform 8 is aligned with the injection tube 7 in turn along the rotation direction. After each rotation by a unit angle, the liquid pump 6 injects liquid into the sampling tube 9 located below the injection tube 7. After all the sampling tubes 9 are injected with liquid, the sampling platform 8 rotates 360° clockwise or counterclockwise again until the position of each sampling tube 9 is aligned with the sand plate air guide tube 14 one by one, and then the gas injection of all the sampling tubes 9 is completed one by one.

[0048] The alternating sampling mode is that the first drive motor 11 rotates clockwise by a unit angle, so that the sampling tube 9 on the sampling platform 8 is aligned with the injection tube 7, and the liquid pump 6 injects liquid into the current sampling tube 9. After the first drive motor 11 continues to rotate by a unit angle, the sampling tube 9 on the sampling platform 8 that has just completed liquid injection is aligned with the sand plate air guide tube 14, and the multi-way valve 4 injects gas into the current sampling tube 9 to complete the sampling of one sampling tube 9; the liquid pump 6 continues to inject liquid into the current sampling tube 9, and the cycle is repeated in sequence until all sampling tubes 9 have completed liquid injection and gas injection.

[0049] The batch sampling mode is to rotate the sampling platform 8 to the position of a specified number of sampling tubes 9 (for example, the first half of the sampling tubes 9) so that they are opposite to the injection tubes 7 one by one. After the first batch of sampling tubes 9 are injected with liquid one by one, these sampling tubes 9 are injected with gas one by one. Rotate to the next batch of sampling tubes 9 and repeat the above steps.

[0050] In combination with the above embodiments, when multiple gas injection devices are provided, each gas injection device is connected to a sampling tube 9 through a sand plate gas guide tube 14. When the continuous sampling mode is adopted, after all the sampling tubes 9 are filled with liquid, multiple sand plate gas guide tubes 14 are connected to multiple sampling tubes 9, and gas is injected into multiple sampling tubes 9 at the same time.

[0051] For ease of understanding, four sampling tubes 9 are provided on the disc, and the distance between two adjacent sampling tubes 9 is 90°. They are numbered 1, 2, 3, and 4. The initial position is that sampling tube 1 9 is aligned with injection tube 7. Taking the continuous sampling mode as an example, the other modes can be referred to: Liquid is injected into sampling tube No. 1 9 by the liquid pump 6 in the first working state, and the injection of liquid into sampling tube No. 1 9 is completed; the first drive motor 11 rotates 90° clockwise, and sampling tube No. 2 9 is aligned with the injection tube 7, and liquid is injected into sampling tube No. 2 9 by the liquid pump 6 in the first working state; the first drive motor 11 rotates 90° clockwise, and sampling tube No. 3 9 is aligned with the injection tube 7, and liquid is injected into sampling tube No. 3 9 by the liquid pump 6 in the first working state; the first drive motor 11 rotates 90° clockwise, and sampling tube No. 4 9 is aligned with the injection tube 7, and liquid is injected into sampling tube No. 4 9 by the liquid pump 6 in the first working state; the injection of liquid into all sampling tubes 9 is completed.

[0052] After the liquid injection is completed, sampling tube No. 1 9 is aligned with the sand plate air guide tube 14, and gas is injected into sampling tube No. 1 9 through the multi-way valve 4 in the second working state to complete the gas injection into sampling tube No. 1 9; the first drive motor 11 rotates 90° clockwise, at this time, sampling tube No. 2 9 is aligned with the sand plate air guide tube 14, and gas is injected into sampling tube No. 2 9 through the multi-way valve 4 in the second working state; and so on, the gas injection into sampling tubes No. 3 and No. 4 9 is completed.

[0053] Similarly, after the liquid injection is completed, the first driving motor 11 rotates 90° counterclockwise for 3 times to complete the gas injection of No. 4, No. 3, No. 2 and No. 1 one by one.

[0054] It can be understood that the relationship between the rotation angle and the movement time of the first drive motor 11 is fixed, so the time for each rotation of the first drive motor 11 by a unit angle is fixed. Therefore, the PLC system can integrate a timing unit, collect the movement time of the first drive motor 11 through the timing unit, and determine the position of the current sampling tube 9 based on the movement time. For example, two adjacent sampling tubes 9 are 15° and rotate 15° per second, so every 15° rotation of the injection tube 7 and the sand plate air guide tube 14 corresponds to a new sampling tube 9.

[0055] Therefore, the control system can receive the movement time of the first drive motor 11, the preset time required for liquid injection and gas injection, determine the total time interval required for each sampling tube 9 to rotate from the liquid injection position to the gas injection position, and complete the liquid injection and gas injection. The control system automatically starts the next rotation according to the total time interval, and automatically starts the peristaltic pump and the magnetic control valve to achieve automatic continuous rotation sampling.

[0056] In some embodiments, for ammonia samples of the same ammonia synthesis system at different time periods, the total time interval also includes the set sampling interval time.

[0057] It can also be known that the total time interval of each sampling is determined by the timing unit. Before each sampling process, the experimenter needs to install multiple sampling tubes 9 in sequence on the sampling platform 8 to achieve liquid and gas injection operations within a continuous time interval. For example, sampling is performed once every 30 minutes, and once every 60 minutes, that is, after completing the sampling of a sampling tube 9 within 30 minutes, after an interval of 60 minutes, the first drive motor 11 continues to rotate, the peristaltic pump and the magnetic control valve are turned on, and the sampling of the next sampling tube 9 continues.

[0058] Of course, when only one or several sampling tubes 9 are needed for sampling, the experimenter can also manually place the sampling tube 9 directly at the liquid injection position or the gas injection position, that is, the position where the sampling tube 9 is relative to the liquid injection tube 7 or the sand plate air guide tube 14, and directly start the liquid injection or gas injection operation at this position.

[0059] Of course, the PLC can control the movement of the first drive motor 11 according to instructions manually input by the user, such as starting and stopping rotation. When the rotation stops, the user manually inputs an instruction to start automatic liquid injection or gas injection.

[0060] Furthermore, the system also includes: a lifting mechanism, including a second drive motor 12, a lifting rod 13 and a supporting plate, the second drive motor 12 is drivingly connected to the lifting rod 13, both ends of the lifting rod 13 are connected to the supporting plate, and a rotating mechanism is provided on the supporting plate; wherein, the control device is connected to the second drive motor 12, and is used to: control the second drive motor 12 to drive the lifting rod 13 to rise and fall, thereby driving the sampling platform 8 to switch between the first height position and the second height position; wherein, the first height position is lower than the second height position.

[0061] In this embodiment, the second drive motor 12 provides power for the lifting rod 13, and the lifting rod 13 is connected to the carrier plate, driving the carrier plate to move up and down, thereby driving the sampling platform 8 on the carrier plate to move up and down. The lifting rod 13 can select two mutually symmetrical Z-shaped lifting rods 13, and the two Z-shaped lifting rods 13 are hinged at the middle position, and the automatic lifting of the carrier plate is realized by the rotation of the intersection point. This structure is a common mechanical structure, and this embodiment will not be described in detail.

[0062] The PLC is connected to the second drive motor 12 and is responsible for controlling the start, stop and movement direction of the second drive motor 12. Specifically, the PLC sets the range of motion of the lifting rod 13, that is, lifting and lowering between the first height position and the second height position. At the first height position, the sampling platform 8 is at the lowest position, at which time the sampling tube 9 and the injection tube 7, or the sand plate air guide tube 14 are at a longer distance; at the second height position, the sampling platform 8 is at the highest position, at which time the sampling tube 9 and the injection tube 7, or the sand plate air guide tube 14 are at a shorter distance or overlap in the height direction. By controlling the lifting and lowering of the sampling platform 8 at the first height position and the second height position by the second drive motor 12, it is possible to avoid interference between the sampling tube 9 and the injection tube 7 or the sand plate air guide tube 14 when the first drive motor 11 rotates.

[0063] Among them, the PLC can start and stop the second drive motor 12 according to the instructions input by the user. Specifically, the first drive motor 11 is started at the first height position to drive the sampling tube 9 to rotate to the injection position. After the sampling tube 9 and the injection tube 7 are aligned, the second drive motor 12 is started to drive the sampling tube 9 to move from the first height position to the second height position, that is, gradually approach the injection tube 7, and stop at the preset height position, and inject liquid through the injection tube 7. Among them, when the sampling tube 9 is at the preset height position, the outlet of the injection tube 7 can be slightly higher than, equal to, or slightly lower than the inlet of the sampling tube 9.

[0064] Of course, the first height position can also be a position where the outlet of the injection tube 7 is flush with the inlet of the sampling tube 9. When the sampling platform 8 is at the first height position, the first drive motor 11 is directly started to drive the sampling tube 9 to rotate to the injection position without starting the second drive motor 12. Liquid is injected through the injection tube 7 at the first height position.

[0065] After the liquid injection is completed, the second drive motor 12 is started to drive the sampling tube 9 to descend from the preset height position to the first height position, or directly at the first height position, the first drive motor 11 is started to drive the sampling tube 9 to rotate to the gas injection position, and the sampling tube 9 and the sand plate air guide tube 14 are aligned, and then the second drive motor 12 is started to drive the sampling tube 9 to move from the first height position to the second height position, and gas is injected at the second height position through the sand plate air guide tube 14. In this embodiment, when the sampling tube 9 is at the second height position, the sand plate air guide tube 14 extends into the sampling tube 9 as the sampling tube 9 gradually rises.

[0066] After the gas injection is completed, the second driving motor 12 is started to drive the sampling tube 9 to descend from the second height position to the first height position to prepare for the next cycle.

[0067] Therefore, before the first driving motor 11 is started, the sampling tube 9 is first lowered to keep the sampling tube 9 away from the liquid injection tube 7 or the sand plate air guide tube 14, and the rotation is started at a low position. During the rotation process, the sampling tube 9 will not collide with the liquid injection tube 7 at the liquid injection position, and will not collide with the sand plate air guide tube 14 at the air injection position; and after the sampling tube 9 is in the correct liquid injection position or air injection position through the first rotating motor, the sampling platform 8 is lifted and lowered to make the sampling tube 9 close to the liquid injection tube 7 or the sand plate air guide tube 14 to achieve accurate connection and operation, and avoid inaccurate docking or misalignment of the sampling tube 9 with the liquid injection tube 7 or the sand plate air guide tube 14 during the lifting operation, which wastes time or damages mechanical parts. And the height of the sampling tube 9 at the liquid injection position is lower than that at the air injection position, so as to avoid the escape or incomplete absorption of ammonia.

[0068] Preferably, the control device is also used to: when the sampling platform 8 is at a first height position, control the first drive motor 11 to drive the sampling platform 8 to rotate; when the position of the sampling tube 9 is relative to the position of the injection tube 7, control the second drive motor 12 to drive the sampling platform 8 to move from the first height position to the second height position; and when the position of the sampling tube 9 is relative to the position of the sand plate air guide tube 14, control the second drive motor 12 to drive the sampling platform 8 to be at the second height position.

[0069] In this embodiment, a distance sensor can be set at the first height position. Therefore, when the sampling platform 8 is at the first height position, the control device controls the first drive motor 11 to rotate in a preset motion mode based on the height position information collected by the distance sensor after receiving the collection instruction input by the user.

[0070] In combination with the above embodiments, the current position of the sampling tube 9 can be determined by the timing unit. When the sampling tube 9 is relative to the injection tube 7, the control system automatically sends a lifting signal to the second drive motor 12, starts the second drive motor 12, and drives the sampling platform 8 to rise to a preset height position, so that the sampling tube 9 is flush with the injection tube 7 for easy injection. Similarly, when the sampling tube 9 rotates to a position where it docks with the sand plate air guide tube 14, the control system automatically sends a lifting signal to the second drive motor 12, raises the sampling platform 8 to a second height position, and inserts the sand plate air guide tube 14 into the sampling tube 9, thereby realizing the gas injection operation.

[0071] Therefore, the entire process does not require manual intervention. The system can automatically determine whether the sampling tube 9 is in the liquid injection position or the gas injection position and adjust the height accordingly, thereby realizing automatic liquid injection and gas injection, making the operation more efficient, saving time and improving the accuracy of sample collection.

[0072] In combination with the above embodiment, when the time for starting the rotation next time is determined by a timing unit, the total time interval also includes the lifting time required for each liquid injection or gas injection.

[0073] In another embodiment, the sampling platform 8 includes an upper mounting plate and a lower mounting plate connected to each other, the upper mounting plate is provided with a plurality of through holes, the lower mounting plate is provided with a plurality of slots, and each sampling tube 9 axially passes through each through hole and is snapped into each slot. In this embodiment, the upper mounting plate and the lower mounting plate are connected by three circumferential arrays of fixing pins, and the relatively arranged through holes and slots form a mounting hole, the sampling tube 9 is installed in the mounting hole, and the sampling tube 9 is axially and radially fixed by the upper and lower mounting plates to prevent the sampling tube 9 from falling off or shifting due to vibration or rotation during operation. Among them, the through hole of the upper mounting plate is designed according to the shape of the tube body of the sampling tube 9, for example, a circular hole; the slot of the lower mounting plate can be designed according to the bottom shape of the sampling tube 9 (for example, circular, elliptical or conical) to adapt to different types of sampling tubes 9.

[0074] See also Figure 5 , Figure 5 The flowchart of the steps of the automatic collection method of synthetic ammonia of the present invention is shown. The method relies on an automatic collection system of synthetic ammonia as provided by the present invention. The method comprises the following steps: S1, in response to a collection instruction input by a user, controlling the liquid pump 6 to be in a first working state, so that the absorption liquid in the liquid storage tank 5 flows from the injection pipe 7 to the sampling pipe 9 on the sampling platform 8 at a first preset time length and a first preset flow rate; S2, control the multi-way valve 4 to be in the second working state, so that ammonia gas flows from the gas passage connected to the sampling tube 9 to the sampling tube 9 injected with the absorption liquid on the sampling platform 8 at a second preset time and a second preset flow rate, thereby realizing automatic collection of ammonia gas.

[0075] Furthermore, before step S1, the following steps are also included: S101, controlling the first driving motor 11 to drive the rotating shaft 10 to rotate in a preset motion mode, thereby driving the sampling platform 8 to rotate, so that the position of the sampling tube 9 is opposite to the position of the injection tube 7; Furthermore, before step S2, the following steps are also included: S201 , controlling the first driving motor 11 to drive the rotating shaft 10 to rotate in a preset motion mode, thereby driving the sampling platform 8 to rotate, so that the position of the sampling tube 9 is opposite to the position of the sand plate air guide tube 14 .

[0076] Furthermore, after step S101, the following steps are further included: S102, controlling the second driving motor 12 to drive the sampling platform 8 to move from the first height position to the second height position; Furthermore, after step S201, the following steps are further included: S202 , controlling the second driving motor 12 to drive the sampling platform 8 to be at a second height position.

[0077] As for the method embodiment, since it is basically similar to the device embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the device embodiment.

[0078] For example: a synthetic ammonia automatic collection method uses the above synthetic ammonia automatic collection system to monitor an ammonia synthesis reaction. An ammonia sample needs to be collected once every hour, each collection time is 30 minutes, and a total of 24 collections are required. According to these requirements, we can set the controller to operate in the following way: (1) Every 60 minutes, the PLC starts the first drive motor 11 and rotates the sampling platform 8 by 15°, so that the current sampling tube 9 faces the injection tube 7 at the end of the peristaltic pump; (2) PLC controls the peristaltic pump to add 50 mL of absorption liquid into the current sampling tube 9.

[0079] (3) The PLC starts the first drive motor 11 and rotates the platform 15° again, so that the current sampling tube 9 faces the sand plate air guide tube 14, and then starts the second drive motor 12 to raise the sampling platform 8 by 10 cm.

[0080] (4) The PLC controls the magnetic control valve to open, and ammonia enters the absorption liquid in the sampling tube 9 through the detection pipeline 3, and gas collection begins.

[0081] (5) After 30 minutes, the PLC controls the magnetic control valve to reopen, and the unreacted gas is guided to the exhaust gas treatment system through the outlet pipe 2.

[0082] (6) The PLC starts the second drive motor 12 to control the sampling platform 8 to descend and reset, waiting for the next sampling tube 9 to collect the sample in the next cycle.

[0083] It should be noted that, for the method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of the present application are not limited by the described order of actions, because according to the embodiments of the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily required by the embodiments of the present application.

[0084] As for the method embodiment, since it is basically similar to the system embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0085] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0086] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device.

[0087] The above is a detailed introduction to a synthetic ammonia automatic collection system and method provided by the present application. The principle and implementation method of the present application are described in detail using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those skilled in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the protection scope of the present application.

Claims

1. A synthetic ammonia automatic collection system, characterized in that: The system includes: A gas injection device, comprising a multi-way valve and at least one gas passage, wherein the gas injection device is used to communicate with the synthetic ammonia system to receive and distribute ammonia gas discharged from the synthetic ammonia system; The liquid injection device comprises a liquid storage tank, a liquid pump and a liquid injection pipe which are connected in sequence, wherein the liquid storage tank stores absorption liquid; A collection device, comprising a sampling platform and a plurality of sampling tubes installed on the sampling platform, each of the sampling tubes being used to communicate with one of the gas passages and the liquid injection tube, respectively, to receive the ammonia gas injected by the gas injection device and the absorption liquid injected by the liquid injection device, so that the ammonia gas is dissolved in the absorption liquid; A control device, connected to the multi-way valve and the liquid pump, respectively, for: Controlling the liquid pump to be in a first working state, so that the absorption liquid in the liquid storage tank flows out from the liquid injection pipe at a first preset time length and a first preset flow rate; and, The multi-way valve is controlled to be in a second working state, so that the ammonia gas flows out from the gas passage connected to the sampling tube at a second preset time length and a second preset flow rate.

2. The automatic synthetic ammonia collection system according to claim 1, characterized in that: A sand plate air guide pipe is arranged at the outlet of the gas passage communicated with the sampling tube.

3. The automatic synthetic ammonia collection system according to claim 2, characterized in that: The system further comprises: A rotating mechanism, comprising a first driving motor and a rotating shaft connected to each other, wherein the rotating shaft is connected to the sampling platform; Wherein, the control device is connected to the first drive motor and is used to: The first driving motor is controlled to drive the rotating shaft to rotate in a preset motion mode, thereby driving the sampling platform to rotate, so that the position of the sampling tube is opposite to the position of the injection tube, or the position of the sampling tube is opposite to the position of the sand plate air guide tube.

4. The automatic synthetic ammonia collection system according to claim 3, characterized in that: The system further comprises: The lifting mechanism comprises a second driving motor, a lifting rod and a carrying plate, wherein the second driving motor is drivingly connected to the lifting rod, both ends of the lifting rod are connected to the carrying plate, and the rotating mechanism is arranged on the carrying plate; Wherein, the control device is connected to the second drive motor and is used for: The second driving motor is controlled to drive the lifting rod to move up and down, thereby driving the sampling platform to switch between a first height position and a second height position; wherein the first height position is lower than the second height position.

5. The automatic synthetic ammonia collection system according to claim 4, characterized in that: The control device is also used for: When the sampling platform is at the first height position, controlling the first driving motor to drive the sampling platform to rotate; When the position of the sampling tube is opposite to the position of the injection tube, controlling the second driving motor to drive the sampling platform to move from the first height position to the second height position; and When the position of the sampling tube is opposite to the position of the sand plate air guide tube, the second driving motor is controlled to drive the sampling platform to the second height position.

6. The automatic synthetic ammonia collection system according to claim 2, characterized in that: The system further comprises: The base is provided with the liquid injection pipe and the sand plate air guide pipe on the base and is located above the sampling platform.

7. The automatic synthetic ammonia collection system according to claim 1, characterized in that: The sampling platform is circular, and has a plurality of mounting holes in a circumferential array on the sampling platform, and each mounting hole is clamped to each sampling tube.

8. The automatic synthetic ammonia collection system according to claim 7, characterized in that: The sampling platform comprises an upper mounting plate and a lower mounting plate connected to each other, the upper mounting plate is provided with a plurality of through holes, the lower mounting plate is provided with a plurality of slots, and each sampling tube axially passes through each of the through holes and is snapped into each of the slots.

9. The automatic synthetic ammonia collection system according to claim 1, characterized in that: There are multiple gas injection devices, and the multiple gas injection devices are used to connect different synthetic ammonia systems; Wherein, each of the gas injection devices comprises a three-way valve and two gas passages, the inlet of the three-way valve is connected to the corresponding synthetic ammonia system through the gas inlet pipeline, and the outlet of the three-way valve is respectively connected to the two gas passages to control the on-off of the two gas passages; Among them, one of the gas passages is used to communicate with the exhaust gas treatment system, and the other gas passage is connected to the sampling tube.

10. A method for automatically collecting synthetic ammonia, characterized in that: Relying on the automatic collection system for synthetic ammonia according to any one of claims 1 to 9, the method includes: In response to a collection instruction input by a user, the liquid pump is controlled to be in a first working state, so that the absorption liquid in the liquid storage tank flows from the liquid injection pipe to the sampling pipe on the sampling platform at a first preset time and a first preset flow rate; The multi-way valve is controlled to be in a second working state, so that ammonia gas flows from the gas passage connected to the sampling tube to the sampling tube injected with the absorption liquid on the sampling platform at a second preset time and a second preset flow rate, thereby realizing automatic collection of the ammonia gas.

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