Device and method for avoiding crystallization of ammonia gas sampling pipe and ammonia supply pipeline

Abstract

The invention discloses a device and method for avoiding crystallization of an ammonia gas sampling pipe and an ammonia supply pipeline, the device comprises a first electromagnetic valve, a second electromagnetic valve, an ejector and a controller, the first electromagnetic valve is arranged on a steam pipeline; the second electromagnetic valve is arranged on the water supply pipeline; the ejector is connected with a steam pipeline and a water supply pipeline; the ejector is connected with the porous flange on the ammonia gas sampling pipeline through an ejection pipeline; the controller is used for controlling the first electromagnetic valve to be opened, opening the gas source and controlling the second electromagnetic valve to be opened when the ammonia gas sampling pipeline is blocked due to crystallization, so that hot water enters the ejector, and steam and the hot water are ejected to the ammonia gas sampling pipeline through the ejector so as to dissolve ammonia gas crystals in the ammonia gas sampling pipeline. Ammonia crystals in the ammonia sampling pipeline can be effectively dissolved, so that the safety and stability of ammonia conveying can be ensured, and normal monitoring and display of environmental protection parameters of a unit can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of denitration equipment in thermal power plants, and particularly to a device, a method and an ammonia supply pipeline for avoiding crystallization of ammonia sampling pipes. Background Art

[0002] In the ammonia sampling link of the denitration system in a thermal power plant, it generally aims to ensure the stable operation of the power plant equipment, improve power generation efficiency and environmental protection benefits. The ammonia sampling link generally relies on automatic control technology to realize real-time monitoring of the operating parameters of the ammonia sampling pipeline through temperature sensors, pressure sensors, etc.

[0003] However, due to the low temperature in cold winter, ammonia is likely to form ammonia crystals in the ammonia sampling pipeline, causing blockage, so that the measuring device cannot monitor the pipeline data, which affects the safe and stable operation of the ammonia supply system and also affects the normal monitoring of the environmental protection parameters of the unit. Summary of the Invention

[0004] The present invention aims to solve at least to some extent the technical problems in the related art. To this end, the first object of the present invention is to provide a device for avoiding crystallization of ammonia sampling pipes, which can effectively dissolve the ammonia crystals in the ammonia sampling pipes, thereby ensuring the safety and stability of ammonia transportation, and further ensuring the normal monitoring of the environmental protection parameters of the unit.

[0005] The second object of the present invention is to provide an ammonia supply pipeline.

[0006] The third object of the present invention is to provide a method for avoiding crystallization of ammonia sampling pipes.

[0007] To achieve the above object, the present invention is realized through the following technical solutions:

[0008] A device for avoiding crystallization of ammonia sampling pipes, comprising:

[0009] A first solenoid valve, arranged on the steam pipeline, and the steam pipeline is connected to a gas source;

[0010] A second solenoid valve, arranged on the water supply pipeline, and the water supply pipeline is connected to a hot water tank, and the hot water tank stores hot water within a preset temperature range;

[0011] An ejector, the intake end of the ejector is connected to the steam pipeline, the water inlet end of the ejector is connected to the water supply pipeline, and the water outlet end of the ejector is connected to the ammonia sampling pipeline through an injection pipeline;

[0012] A controller, which is respectively connected to a first solenoid valve and a second solenoid valve. The controller is used to control the first solenoid valve to open and turn on the gas source when the ammonia sampling pipeline is crystallized and blocked, and control the second solenoid valve to open so that hot water enters the ejector, so as to eject steam and hot water into the ammonia sampling pipeline through the ejector to dissolve the ammonia crystals in the ammonia sampling pipeline.

[0013] Preferably, the device further includes a porous flange, which is arranged on the ammonia sampling pipeline, and the injection pipeline is connected to the ammonia sampling pipeline through the porous flange.

[0014] Preferably, the porous flange includes at least a pair of trumpet-shaped injection pipes, and at least a pair of trumpet-shaped injection pipes are symmetrically distributed on both sides of the ammonia sampling pipeline and are connected to the ammonia sampling pipeline.

[0015] Preferably, one end of the ammonia sampling pipeline is connected to the ammonia main pipe, and the other end of the ammonia sampling pipeline is connected to a transmitter, and the transmitter is used to detect the pressure of the ammonia sampling pipeline.

[0016] Preferably, the device further includes a check valve, which is arranged on the injection pipeline and is used to prevent the reverse flow of hot water.

[0017] Preferably, the device further includes a manual valve, which is arranged on the ammonia sampling pipeline and is used to close the ammonia sampling pipeline during maintenance.

[0018] To achieve the above object, the second aspect of the present invention provides an ammonia supply pipeline, including:

[0019] An ammonia main pipe;

[0020] An ammonia sampling pipeline; and

[0021] The device for avoiding crystallization of the ammonia sampling pipe as described above, and the ammonia sampling pipeline is respectively connected to the ammonia main pipe and the device.

[0022] To achieve the above object, the third aspect of the present invention provides a method for avoiding crystallization of the ammonia sampling pipe, which is applied to the device or the ammonia supply pipeline as described above, and the method includes:

[0023] Obtain the pipeline crystallization volume data corresponding to the low-temperature period of the ammonia sampling pipeline;

[0024] Obtain the hot water injection volume data corresponding to the pipeline crystallization volume data of the ammonia sampling pipeline in the low-temperature period, and establish a data analysis model based on the mapping relationship between the two;

[0025] When the ammonia sampling pipeline is crystallized, obtain the real-time pipeline crystallization volume data, and determine the corresponding hot water injection volume according to the data analysis model for injection, so as to dissolve the ammonia crystals in the ammonia sampling pipeline.

[0026] Preferably, the temperature range of the hot water is 60 - 80°C, and the hot water is mixed with a surfactant.

[0027] Preferably, the method further includes determining the crystallization degree according to the real-time pipeline crystallization volume data, and adjusting the injection time and injection frequency of the injector according to the crystallization degree.

[0028] The present invention has at least the following technical effects:

[0029] The present invention provides a solution to avoid crystallization of the ammonia sampling pipe. A device for avoiding crystallization of the ammonia sampling pipe is provided. The device provides a specific connection mode of pipelines and related equipment. Under this device, when the ammonia sampling pipeline is blocked by crystallization, the controller can control the first solenoid valve to open, turn on the gas source, and control the second solenoid valve to open, so that hot water enters the injector. Then, the steam and hot water are sprayed into the ammonia sampling pipeline through the injector to eliminate the ammonia crystals in the ammonia sampling pipeline by means of purging and high-temperature dissolution, thus ensuring the smoothness of the ammonia sampling pipeline, ensuring the normal transportation of ammonia, and further ensuring the normal monitoring and display of environmental protection parameters.

[0030] In addition, the device provided by the present invention further includes a porous flange. The porous flange includes a plurality of horn-shaped injection pipes. The plurality of horn-shaped injection pipes are symmetrically distributed on both sides of the ammonia sampling pipeline and are connected thereto. Through the plurality of horn-shaped injection pipes, it can be ensured that hot water and steam are injected into each section position and both sides of the ammonia sampling pipeline to ensure that the crystals in the ammonia sampling pipeline are dissolved without dead angles, thereby fundamentally solving the problem of crystal dissolution. The present invention also gives the specific temperature range of the hot water capable of dissolving ammonia crystals; the present invention also gives a solution of mixing a surfactant with the hot water. Through the wetting, dispersion, solubilization and inhibition of crystal growth effects of the surfactant, the dissolution of crystals is promoted in the form of a mixed solution.

[0031] Finally, the present invention also provides a method for avoiding crystallization of the ammonia sampling pipe. Through the coupling relationship between the pipeline crystallization volume data and the hot water injection volume data in the low-temperature period, the timed and quantitative injection of hot water can be realized, and further the problem of ammonia crystallization in the ammonia sampling pipeline can be eliminated. Among them, determining the crystallization degree according to the pipeline crystallization volume data and adjusting the injection time and injection frequency of the injector according to the crystallization degree can accurately and effectively eliminate the ammonia crystallization problem.

[0032] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0033] Figure 1Schematic structural diagram of the device for preventing crystallization of ammonia sampling pipe in the embodiment of the present invention.

[0034] Figure 2 Schematic plan view of the porous flange in the embodiment of the present invention.

[0035] Figure 3 Cross-sectional view of the porous flange in the embodiment of the present invention.

[0036] Figure 4 Schematic three-dimensional structure view of the porous flange in the embodiment of the present invention.

[0037] Figure 5 Flow chart of the method for preventing crystallization of ammonia sampling pipe in the embodiment of the present invention. Detailed implementation manners

[0038] The following details this embodiment. Examples of the embodiment are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0039] The following describes the device, method and ammonia supply pipeline for preventing crystallization of ammonia sampling pipe in this embodiment with reference to the accompanying drawings.

[0040] Figure 1 Schematic structural diagram of the device for preventing crystallization of ammonia sampling pipe in the embodiment of the present invention.

[0041] As Figure 1 shown, the device includes a first solenoid valve 1, a second solenoid valve 2, an ejector 3, a controller 4 and a hot water tank 5. Among them, the first solenoid valve 1 is arranged on the steam pipeline, and the steam pipeline is connected to the gas source; the second solenoid valve 2 is arranged on the water supply pipeline, and the water supply pipeline is connected to the hot water tank 5, and the hot water tank 5 stores hot water in a preset temperature range such as 60 - 80 °C. The air inlet end of the ejector 3 is connected to the steam pipeline, the water inlet end of the ejector 3 is connected to the water supply pipeline, and the water outlet end of the ejector 3 is connected to the ammonia sampling pipeline 11 (see Figure 2 ). The controller 4 is respectively connected to the first solenoid valve 1 and the second solenoid valve 2. When the ammonia sampling pipeline 11 is crystallized and blocked, the controller 4 is used to control the first solenoid valve 1 to open, turn on the gas source, and control the second solenoid valve 2 to open, so that hot water enters the ejector 3, so as to spray steam and hot water to the ammonia sampling pipeline 11 through the ejector 3 to eliminate the ammonia crystals in the ammonia sampling pipeline 11 by means of steam purging and hot water high-temperature dissolution. It can be understood that the amount of hot water can be controlled by the second solenoid valve 2. In this embodiment, the controller 4 can be a PLC (Programmable Logic Controller) control cabinet.

[0042] In this embodiment, by adopting the above structure and control method, and the mixing method of hot water and ammonia crystals within the temperature range of 60 - 80 °C, the ammonia crystals can be dissolved, solving the problem of crystallization blockage in the ammonia sampling pipeline 11. Among them, the mixing of hot water and ammonia crystals mainly causes the physical melting and dissolution of ammonia crystals, forming ammonia and ammonia aqueous solution, which does not affect the normal transportation of ammonia, ensures the smoothness of the ammonia sampling pipeline 11, and ensures the normal monitoring and display of environmental protection parameters.

[0043] Further, one end of the ammonia sampling pipeline 11 is connected to the ammonia main pipe 10 for transporting ammonia, and the other end of the ammonia sampling pipeline 11 is connected to the transmitter 7. The transmitter 7 is a pressure measuring point device for detecting the pressure of the ammonia sampling pipeline.

[0044] Further, the device further includes a porous flange 6, which is arranged on the ammonia sampling pipeline 11, and the injection pipeline is connected to the ammonia sampling pipeline 11 through the porous flange 6.

[0045] Figure 2 It is the schematic plan view of the porous flange 6 of the embodiment of the present invention. Figure 3 It is the sectional view of the porous flange 6 of the embodiment of the present invention. Figure 4 It is the schematic three-dimensional view of the porous flange 6 of the embodiment of the present invention. As Figures 2 - 4 shown, the porous flange 6 includes 6 trumpet-shaped injection pipes (i.e., three pairs of trumpet-shaped injection pipes), and the 6 trumpet-shaped injection pipes are symmetrically distributed on both sides of the ammonia sampling pipeline 11 and are connected to the ammonia sampling pipeline 11.

[0046] Specifically, Figures 2 - 4 the porous flange 6 in [description] includes a cylindrical component, the cylindrical component is sleeved on the ammonia sampling pipeline 11, an arc-shaped connecting rod is arranged on the back of the top of the cylindrical component, vertical connecting rods perpendicular to the horizontal plane are arranged at both ends of the arc-shaped connecting rod, and three injection pipes are arranged on the vertical connecting rods. The three injection pipes all penetrate the cylindrical component in the horizontal direction and point to the ammonia sampling pipeline 11 and are connected to the ammonia sampling pipeline 11. On the side of the cylindrical component close to the injection pipes, the three injection pipes, the vertical connecting rods and the arc-shaped connecting rod together form three trumpet-shaped injection pipes. On the opposite side of the corresponding cylindrical component, there are also three trumpet-shaped injection pipes. Thus, the porous flange 6 includes a total of 6 trumpet-shaped injection pipes, and in order to increase the injection area, the injection nozzles of all injection pipes are trumpet-shaped.

[0047] In this embodiment, by setting the above-mentioned trumpet-shaped injection pipe structure, it can be ensured that hot water and steam are injected into each section position and both sides of the ammonia sampling pipeline 11, so as to ensure that the ammonia crystals in the ammonia sampling pipeline 11 are dissolved without dead angles, thus fundamentally solving the problem of dissolving ammonia crystals.

[0048] Further, the device further includes a check valve 8 which is arranged on the injection pipeline and used to prevent the backflow of hot water. The device further includes a manual valve 9 which is arranged on the ammonia sampling pipeline 11 and used to close the ammonia sampling pipeline 11 during the maintenance of the pipeline or the device.

[0049] The working principle of this device is as follows:

[0050] In winter with low temperature, the ammonia sampling pipeline 11 is prone to blockage and the ammonia pressure display is abnormal. The staff remotely control the PLC control cabinet, i.e., the controller 4. The controller 4 sends an opening instruction to the second solenoid valve 2. After hot water enters the ejector 3, the second solenoid valve 2 closes. The controller 4 opens the first solenoid valve 1, i.e., opens the gas source, and sprays hot water and steam at 60 - 80 °C into the porous flange 6 through the ejector 3. The steam and hot water flow into the ammonia sampling pipeline 11 through the horn-shaped injection pipe of the porous flange 6, contact the ammonia crystals in the ammonia sampling pipeline 11, and generate ammonia and ammonia water after reaction, so that the ammonia sampling pipeline 11 remains unblocked and the normal display of environmental protection parameters is also ensured. Of course, the method of spraying hot water into the ammonia sampling pipeline 11 regularly and quantitatively in low-temperature weather can also be adopted to effectively prevent the low-temperature crystallization of the ammonia sampling pipeline 11.

[0051] Further, the present invention also provides an ammonia supply pipeline, including: an ammonia main pipe 10, an ammonia sampling pipeline 11, and the above device for preventing the crystallization of the ammonia sampling pipe, wherein the ammonia sampling pipeline 11 is respectively connected to the ammonia main pipe 10 and the above device.

[0052] Further, the present invention also provides a method for preventing the crystallization of the ammonia sampling pipe, which is applied to the above device or the above ammonia supply pipeline.

[0053] Figure 5 It is a flowchart of the method for preventing the crystallization of the ammonia sampling pipe in the embodiment of the present invention. As Figure 5 shown, the method includes:

[0054] Step S101: Obtain the pipeline crystallization volume data corresponding to the low-temperature period of the ammonia sampling pipeline.

[0055] Step S102: Obtain the hot water injection volume data corresponding to the pipeline crystallization volume data of the ammonia sampling pipeline in the low-temperature period, and establish a data analysis model based on the mapping relationship between the two.

[0056] Step S103: When the ammonia sampling pipeline crystallizes, obtain the real-time pipeline crystallization volume data, and determine the corresponding hot water injection volume according to the data analysis model for injection, so as to dissolve the ammonia crystals in the ammonia sampling pipeline.

[0057] The following describes in detail the operation steps of the device for preventing the crystallization of the ammonia sampling pipe in combination with this method.

[0058] To effectively solve the crystallization problem of ammonia supply pipelines and ammonia sampling pipelines in thermal power plants and ensure no adverse impact on ammonia transportation, the following steps are recommended:

[0059] Step 1: Analyze the crystallization reasons

[0060] (1) Temperature factor: Low temperature may cause ammonia to condense into solids on the inner wall of the pipeline.

[0061] (2) Pressure change: Pressure fluctuations may prompt the precipitation of ammonia crystals.

[0062] (3) Impurity influence: Impurities in the pipeline may promote the formation of crystals.

[0063] Step 2: Select a suitable solution

[0064] Based on the above analysis, it is recommended to use hot water or an aqueous solution with a small amount of surfactant as the spraying medium. This solution has the following advantages:

[0065] (1) Effectiveness: Hot water can increase the solubility of crystalline substances, soften or dissolve the crystals.

[0066] (2) Safety: The aqueous solution will not corrode the pipeline material.

[0067] (3) Compatibility: It will not chemically react with ammonia, ensuring the safety of ammonia transportation.

[0068] (4) Environmental friendliness: It is friendly to humans and the environment.

[0069] Step 3: Implement the spraying operation

[0070] (1) Prepare tools and materials:

[0071] 1) Hot water spraying equipment.

[0072] 2) Temperature control device to ensure the water temperature is appropriate (recommended not to exceed 80°C).

[0073] 3) Surfactant (optional), which can promote the dissolution of ammonia crystals in the form of a mixture through the wetting, dispersion, solubilization, and inhibition of crystal growth effects of the surfactant.

[0074] (2) Operation process:

[0075] 1) Preheat: Heat the water to an appropriate temperature (recommended 60 - 80°C).

[0076] 2) Mix the surfactant: If necessary, add the surfactant in proportion and stir evenly.

[0077] 3) Injection operation: Obtain real-time data on the volume of crystallization in the pipeline, determine the amount of hot water to be injected based on the pipeline crystallization volume data, and use an injection device, i.e., an injector, to evenly inject a fixed amount of hot water into the crystallization site.

[0078] 4) Duration: Determine the degree of crystallization based on the pipeline crystallization volume data, and adjust the injection time and frequency according to the degree of crystallization. For example, determine different grades of crystallization degrees based on different pipeline crystallization volume data, and correspondingly determine the injection time and injection frequency according to different grades of crystallization degrees.

[0079] 5) Cleaning residues: After the injection is completed, rinse the pipeline with clean water to ensure that there is no residual solution.

[0080] Step Four: Preventive Measures

[0081] 1) Regular maintenance: Regularly inspect the pipeline to promptly detect and handle crystallization problems.

[0082] 2) Temperature control: Maintain an appropriate temperature inside the pipeline to prevent crystallization caused by low temperature.

[0083] 3) Pressure management: Reasonably adjust the pipeline pressure to avoid crystallization caused by pressure fluctuations.

[0084] 4) Impurity filtration: Add a filtration device to the ammonia supply system to reduce the impact of impurities on crystallization.

[0085] Step Five: Precautions

[0086] 1) Safety protection: Wear protective equipment (such as gloves and goggles) during the operation to prevent injuries caused by splashing of high-temperature water or solution.

[0087] 2) Temperature control: Avoid thermal stress damage to the pipeline caused by excessive water temperature.

[0088] 3) Environmental protection treatment: Properly handle the used solution and wastewater to meet environmental protection requirements.

[0089] By implementing the above steps, the crystallization problem in the pipeline can be effectively resolved, while ensuring the safety and stability of ammonia transportation.

[0090] In summary, the present invention provides a solution to avoid crystallization of the ammonia sampling pipe. A device for avoiding crystallization of the ammonia sampling pipe is provided, and the device provides a specific connection mode for pipelines and related equipment. Under this device, when the ammonia sampling pipeline is blocked by crystallization, the controller can control the first solenoid valve to open, turn on the gas source, and control the second solenoid valve to open, so that hot water enters the ejector. Then, the steam and hot water are ejected into the ammonia sampling pipeline through the ejector to eliminate the ammonia crystals in the ammonia sampling pipeline by means of purging and high-temperature dissolution, thus ensuring the smoothness of the ammonia sampling pipeline, the normal transportation of ammonia, and further ensuring the normal monitoring and display of environmental protection parameters.

[0091] In addition, the device provided by the present invention further includes a porous flange, which includes a plurality of horn-shaped injection pipes. The plurality of horn-shaped injection pipes are symmetrically distributed on both sides of the ammonia sampling pipeline and are connected thereto. Through the plurality of horn-shaped injection pipes, it can be ensured that hot water and steam are injected into each section of the ammonia sampling pipeline and both sides of the pipeline, so as to ensure that the crystals in the ammonia sampling pipeline are dissolved without dead angles, thus fundamentally solving the problem of crystal dissolution. The present invention also gives the specific temperature range of the hot water that can dissolve ammonia crystals; the present invention also gives a solution of mixing hot water with a surfactant. Through the wetting, dispersing, solubilizing and crystal growth inhibition effects of the surfactant, the dissolution of crystals is promoted in the form of a mixed solution.

[0092] Finally, the present invention also provides a method for avoiding crystallization of the ammonia sampling pipe. Through the coupling relationship between the pipeline crystallization volume data and the hot water injection volume data in the low-temperature period, the timed and quantitative injection of hot water can be realized, and then the problem of ammonia crystallization in the ammonia sampling pipeline can be eliminated. Among them, determining the crystallization degree according to the pipeline crystallization volume data and adjusting the injection time and injection frequency of the ejector according to the crystallization degree can accurately and effectively eliminate the ammonia crystallization problem.

[0093] It should be noted that in this article, 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 any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0094] Although the content of the present invention has been described in detail through the above preferred embodiments, it should be recognized that the above description should not be considered as a limitation of the present invention. After those skilled in the art have read the above content, various modifications and alternatives to the present invention will be obvious. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims

1. An apparatus for preventing crystallization of ammonia sampling tubes, characterized in that, Comprising: A first solenoid valve, arranged on a steam pipeline, and the steam pipeline is connected to a gas source; A second solenoid valve, arranged on a water supply pipeline, and the water supply pipeline is connected to a hot water tank, and hot water within a preset temperature range is stored in the hot water tank; An ejector, an air inlet end of the ejector is connected to the steam pipeline, a water inlet end of the ejector is connected to the water supply pipeline, and a water outlet end of the ejector is connected to an ammonia sampling pipeline through an ejection pipeline; A controller, connected to the first solenoid valve and the second solenoid valve respectively, and the controller is configured to, when the ammonia sampling pipeline is crystallized and blocked, control the first solenoid valve to open, turn on the gas source, and control the second solenoid valve to open, so that hot water enters the ejector, so as to eject steam and hot water into the ammonia sampling pipeline through the ejector to dissolve the ammonia crystals in the ammonia sampling pipeline.

2. The device according to claim 1, characterized in that, Further comprising a porous flange, arranged on the ammonia sampling pipeline, and the ejection pipeline is connected to the ammonia sampling pipeline through the porous flange.

3. The device according to claim 2, characterized in that, The porous flange includes at least a pair of trumpet-shaped ejection pipes, and at least a pair of trumpet-shaped ejection pipes are symmetrically distributed on two sides of the ammonia sampling pipeline and are connected to the ammonia sampling pipeline.

4. The device according to any one of claims 1 to 3, characterized in that One end of the ammonia sampling pipeline is connected to an ammonia main pipe, and the other end of the ammonia sampling pipeline is connected to a transmitter, and the transmitter is configured to detect the pressure of the ammonia sampling pipeline.

5. The device according to any one of claims 1 to 3, characterized in that Further comprising a check valve, arranged on the ejection pipeline, for preventing hot water from flowing back.

6. The device according to any one of claims 1 to 3, characterized in that Further comprising a manual valve, arranged on the ammonia sampling pipeline, for closing the ammonia sampling pipeline during maintenance.

7. An ammonia supply pipeline, characterized in that, Comprising: An ammonia main pipe; An ammonia sampling pipeline; And An apparatus for preventing crystallization of an ammonia sampling pipe according to any one of claims 1-6; The ammonia sampling pipeline is respectively connected to the ammonia main pipe and the apparatus.

8. A method for preventing crystallization of ammonia sampling tubes, characterized in that, Applied to the apparatus according to any one of claims 1-6 or the ammonia supply pipeline according to claim 7, the method comprises: Obtaining pipeline crystallization volume data corresponding to a low-temperature period of the ammonia sampling pipeline; Obtaining hot water injection volume data corresponding to the pipeline crystallization volume data of the ammonia sampling pipeline in the low-temperature period, and establishing a data analysis model based on the mapping relationship between the two; When the ammonia sampling pipeline is crystallized, obtaining real-time pipeline crystallization volume data, and determining a corresponding hot water injection volume according to the data analysis model for injection, so as to dissolve the ammonia crystals in the ammonia sampling pipeline.

9. The method according to claim 8, wherein The temperature range of the hot water is 60-80°C, and the hot water is mixed with a surfactant.

10. The method according to claim 8 or 9, characterized in that, The method further comprises determining the crystallization degree according to the real-time pipeline crystallization volume data, and adjusting the injection time and injection frequency of the ejector according to the crystallization degree.

Images