An ammonium nitrate solution sampling apparatus

Abstract

The utility model relates to an ammonium nitrate solution sampling equipment, it includes: density measurement unit, sampling unit, the sampling unit includes the sampling jar, the liquid inlet pipe that one end communicates with the lower part of sampling jar and another end communicates with the connecting pipe and the overflow pipe that one end communicates with the upper part of sampling jar and another end communicates with the connecting pipe, install first electric control ball valve on the liquid inlet pipe, the liquid preparation unit, the liquid preparation unit includes the high tank, the water inlet pipe that one end communicates with the lower part of high tank, the overflow pipe that one end communicates with the upper part of high tank and another end communicates with the water inlet pipe and install first liquid level meter in the high tank, install third electric control ball valve on the water inlet pipe, install fourth electric control ball valve on the overflow pipe, the proportioning unit is installed with second liquid level meter, second thermometer and pH meter, so can realize the continuous measurement to density, and can measure the pH value of the solution after proportioning.

Description

Technical Field

[0001] This utility model relates to chemical sampling and analysis instruments, specifically to a sampling device for ammonium nitrate solution. Background Technology

[0002] Ammonium nitrate is a white crystalline powder of ammonium salt. It is highly soluble in water, hygroscopic, and prone to clumping. It absorbs a large amount of heat upon dissolution and decomposes explosively upon impact or heating. It also decomposes in alkaline conditions. It is mainly used as fertilizer and in industrial and military explosives. Factors affecting the stability of ammonium nitrate solutions include concentration, temperature, pH, organic matter, oils, and chloride ions. A pH below 4.0 makes the solution significantly acidic, accelerating the decomposition of ammonium nitrate. Therefore, the pH and concentration of ammonium nitrate solutions should be regularly monitored during actual production and storage.

[0003] In 2021, the Ministry of Emergency Management issued the "Notice on Further Strengthening the Safety Management of Ammonium Nitrate," requiring that "ammonium nitrate production enterprises should strengthen process technology management, strictly control process parameters such as raw material ratio, reaction temperature, and pH value, and establish a sound system for regular testing." However, because the temperature during the production and storage of ammonium nitrate solution is between 120℃ and 180℃, and the crystallization temperature of 92% ammonium nitrate solution is basically around 110℃, it is extremely easy to crystallize, posing a technical challenge of not being able to monitor and adjust the pH of the ammonium nitrate solution online.

[0004] Chinese utility model patent application number 202320865236.6 discloses a technology in ammonium nitrate production, specifically involving an online detection and automatic adjustment system for the pH of high-concentration, high-temperature ammonium nitrate solutions. It includes, in sequence according to the process flow: a pipeline mixer, a dilute ammonium nitrate flow indicator, a dilute ammonium nitrate pH sensor, and a water treatment device. High concentration detection is achieved through the dilution of the process solution, and high-temperature measurement is achieved through the pipeline mixer equipped with a cooling device. This system solves the problem of online stable pH detection during the continuous production and storage of high-concentration, high-temperature ammonium nitrate solutions. The detection results are accurate and reliable, eliminating the safety risks associated with manual sampling, avoiding the delays in manual testing results, and ensuring safe production. However, this online detection and automatic adjustment system cannot detect the density of the ammonium nitrate solution.

[0005] Chinese utility model patent application number 202320081208.5 discloses a pH measurement system for ammonium nitrate solution, comprising: a neutralizer, a condenser, a sampling device, a pH meter, and a waste liquid tank, wherein the neutralizer, condenser, and sampling device are connected in sequence; the pH meter is disposed in the sampling device; the waste liquid tank is disposed below the sampling device; the sampling device includes: a liquid-blocking plate, a liquid-blocking plate moving mechanism, a hollow cylinder, and a rinsing mechanism; a liquid-blocking plate is movably disposed at the lower end of the hollow cylinder; the liquid-blocking plate moving mechanism is connected to the liquid-blocking plate and is used to move the liquid-blocking plate; the rinsing mechanism is disposed above the hollow cylinder. This ammonium nitrate solution pH measurement system has a large sampling capacity and cannot be used to measure the density of the ammonium nitrate solution. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art by providing an ammonium nitrate solution sampling device (which is also applicable to the sampling and analysis of acidic and alkaline liquids such as ammonium chlorate solution that are at high temperatures and easily crystallize).

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: an ammonium nitrate solution sampling device, wherein the ammonium nitrate solution is stored in a storage tank, the storage tank comprising a tank body, a circulation pipe installed on the tank body, and a circulation pump installed on the circulation pipe, comprising: A density measuring unit, comprising a first measuring connecting tube and a density meter mounted on the first measuring connecting tube; both ends of the first measuring connecting tube are connected to the circulation tube and are respectively located on both sides of the circulation pump; The sampling unit includes a sampling tank, an inlet pipe with one end connected to the lower part of the sampling tank and the other end connected to the connecting pipe, and an overflow pipe with one end connected to the upper part of the sampling tank and the other end connected to the connecting pipe. A first electrically controlled ball valve is installed on the inlet pipe, and a second electrically controlled ball valve is installed on the overflow pipe. The liquid preparation unit includes a high-level tank, an inlet pipe connected to the lower part of the high-level tank at one end, an overflow pipe connected to the upper part of the high-level tank at one end and the inlet pipe at the other end, and a first level gauge installed in the high-level tank. A third electrically controlled ball valve is installed on the inlet pipe, and a fourth electrically controlled ball valve is installed on the overflow pipe. The mixing unit includes a mixing tank with a vent hole at the top, a discharge pipe connected at one end to the bottom of the sampling tank and at the other end to the mixing tank, a water outlet pipe connected at one end to the bottom of the high-level tank and at the other end to the mixing tank, and a second thermometer, a pH meter and a second level gauge installed in the mixing tank. A fifth electrically controlled ball valve is installed on the discharge pipe and a sixth electrically controlled ball valve is installed on the water outlet pipe.

[0008] Ideally, one end of the first measuring connection tube is connected to the circulation tube and located downstream of the circulation pump, while the other end is connected to the circulation tube and located upstream of the circulation pump.

[0009] Furthermore, the density measuring unit also includes a first pressure reducing valve installed on the first measuring connecting pipe and located upstream of the densitometer, a first check valve installed on the first measuring connecting pipe and located downstream of the densitometer, and a first thermometer installed on the first measuring connecting pipe and located between the densitometer and the first pressure reducing valve.

[0010] Furthermore, the connection point between the inlet pipe and the connecting pipe is located between the densitometer and the first pressure reducing valve; the connection point between the overflow pipe and the connecting pipe is located downstream of the densitometer.

[0011] Optimally, the liquid preparation unit further includes a pipeline booster pump installed on the inlet pipe and upstream of the third electrically controlled ball valve, a ninth electrically controlled ball valve installed on the inlet pipe and upstream of the pipeline booster pump, and a pressure gauge installed on the inlet pipe and located between the pipeline booster pump and the third electrically controlled ball valve. The connection between the overflow pipe and the inlet pipe is located between the ninth electrically controlled ball valve and the pipeline booster pump.

[0012] Optimally, the proportioning unit further includes an aeration mechanism, which includes an air pump and an aeration pipe with one end connected to the air pump and the other end extending into the proportioning tank.

[0013] Furthermore, the aeration pipe includes a first pipe body with one end connected to the air pump and the other end extending to the bottom of the mixing tank, and an air outlet ring formed at the other end of the pipe body and having multiple air outlet holes. The discharge pipe includes a second pipe body with one end connected to the bottom of the sampling tank and the other end extending to the bottom of the mixing tank, and a plurality of discharge holes opened at the other end of the second pipe body.

[0014] Ideally, it also includes: The draining unit includes a draining pipe with one end connected to the bottom of the mixing tank and the other end connected to the inlet pipe, a seventh electrically controlled ball valve installed on the draining pipe, a return pipe with one end connected to the inlet pipe and the other end connected to the circulation pipe, and an eighth electrically controlled ball valve and a second check valve installed on the return pipe in sequence. The connection between the drain pipe and the inlet pipe is located between the ninth electrically controlled ball valve and the pipeline booster pump; The connection between the return water pipe and the inlet water pipe is located between the third electrically controlled ball valve and the pressure gauge. The connection point between the return water pipe and the circulation pipe is located upstream of the circulation pump.

[0015] Due to the application of the above technical solutions, this utility model has the following advantages compared with the prior art: The ammonium nitrate solution sampling device of this utility model is directly connected to the circulation pipe of the storage tank, and the sampling volume can be very small, minimizing the impact on the process system; and it adopts a density measurement unit, sampling unit, liquid preparation unit and ratio unit with a specific structure to cooperate, so as to realize continuous density measurement, thereby adjusting the concentration ratio in real time according to density changes; and it can measure the pH value of the prepared solution. Attached Figure Description

[0016] Figure 1 This is a schematic diagram illustrating the application of the ammonium nitrate solution sampling device of this utility model; Figure 2 This is a schematic diagram of the structure of the ammonium nitrate solution sampling device of this utility model; Figure 3 This is a partial structural schematic diagram of the ammonium nitrate solution sampling device of this utility model; Figure 4 This is another structural schematic diagram of the ammonium nitrate solution sampling device of this utility model; Figure 5 This is a schematic diagram of the discharge pipe in the ammonium nitrate solution sampling device of this utility model; Figure 6 This is a schematic diagram of the aeration pipe in the ammonium nitrate solution sampling device of this utility model. Detailed Implementation

[0017] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0018] Ammonium nitrate solution (currently available, such as a concentration of approximately 92% and a temperature of 120-130°C) is typically stored in storage tank 1' (usually provided by the production company, and can be selected according to actual needs, such as vertical or underground tanks of 10 cubic meters, 20 cubic meters, or 30 cubic meters). Storage tank 1' includes a tank body 11', a circulation pipe 12' installed on the tank body 11', and a circulation pump 13' installed on the circulation pipe 12'. Specifically, one end of the circulation pipe 12' is connected to the lower part of the tank body 11', and the other end is connected to the top of the tank body 11'.

[0019] like Figures 1 to 4 The ammonium nitrate solution sampling device shown is installed on the circulation pipe 12' and mainly includes a density measurement unit 1, a sampling unit 2, a solution preparation unit 3, and a proportioning unit 4.

[0020] The density measuring unit 1 includes a first measuring connecting pipe 11 and a density meter 14 mounted on the first measuring connecting pipe 11. Both ends of the first measuring connecting pipe 11 are connected to the circulation pipe 12' and are located on both sides of the circulation pump 13'. Specifically, one end of the first measuring connecting pipe 11 is connected to the circulation pipe 12' and is located downstream of the circulation pump 13', while the other end is connected to the circulation pipe 12' and is located upstream of the circulation pump 13' (the definitions of upstream and downstream in this application are based on the flow direction of the material, and the same applies below; the diameter of the first measuring connecting pipe 11 can be conventionally selected according to actual needs, such as preferably a stainless steel pipe with a specification of DN10, and the same applies below). Thus, when the circulation pump 13' is working, a portion of the ammonium nitrate solution in the circulation pipe 12' (downstream of the circulation pump 13') flows into the first measuring connecting pipe 11 and then flows back into the circulation pipe 12' (upstream of the circulation pump 13'), enabling continuous density measurement.

[0021] In this embodiment, the density measuring unit 1 further includes a first pressure reducing valve 12 installed on the first measuring connecting pipe 11 and located upstream of the densitometer 14, a first check valve 15 installed on the first measuring connecting pipe 11 and located downstream of the densitometer 14, and a first thermometer 13 installed on the first measuring connecting pipe 11 and located between the densitometer 14 and the first pressure reducing valve 12; i.e., see Figure 1 The flow direction of the material within the first measuring connection pipe 11 is specified. The first measuring connection pipe 11 is sequentially equipped with a first pressure reducing valve 12, a first thermometer 13, a densitometer 14, and a first check valve 15. The densitometer 14 can be a conventional density measuring instrument such as a tuning fork densitometer or a mass flow meter. Alternatively, a first manual sampling branch pipe 16 (equipped with a valve) can be connected to the first measuring connection pipe 11 according to actual needs. The connection point between the first manual sampling branch pipe 16 and the first measuring connection pipe 11 can be located between the first thermometer 13 and the densitometer 14 to facilitate manual sampling. Furthermore, various conventional valves can be added to the first measuring connection pipe 11 to enrich or optimize the control functions of the density measuring unit 1, depending on actual requirements.

[0022] The sampling unit 2 includes a sampling tank 21, an inlet pipe 22 (preferably a DN10 stainless steel pipe) with one end connected to the lower part of the sampling tank 21 and the other end connected to the connecting pipe 11, and an overflow pipe 24 (preferably a DN8 stainless steel pipe) with one end connected to the upper part of the sampling tank 21 and the other end connected to the connecting pipe 11. A first electrically controlled ball valve 23 is installed on the inlet pipe 22, and a second electrically controlled ball valve 25 is installed on the overflow pipe 24. In this embodiment, the connection between the inlet pipe 22 and the connecting pipe 11 is located between the densitometer 14 and the first pressure reducing valve 12, preferably between the densitometer 14 and the first thermometer 13, and more preferably between the densitometer 14 and the first manual sampling branch pipe 16; while the connection between the overflow pipe 24 and the connecting pipe 11 is located downstream of the densitometer 14, preferably between the densitometer 14 and the first check valve 15. In this embodiment, the sampling tank 21 is made of a DN25 stainless steel tube (outer diameter 26.9mm, wall thickness 3.2mm, inner diameter 20.5mm, net height 420mm, and internal volume 139ml). The sampling volume is small (i.e. only 139ml), which has the least impact on the process system. A first vent pipe with a specification of DN10 is installed on the top of the sampling tank 21, and a first vent electrically controlled ball valve 26 is installed on the first vent pipe.

[0023] In this application, the sampling principle of sampling unit 2 is as follows: close the fifth electrically controlled ball valve 421 (hereinafter referred to as the fifth), open the first electrically controlled ball valve 23 and the second electrically controlled ball valve 25 (temporarily open the first venting electrically controlled ball valve 26 to remove air from the sampling tank 21; after the air is vented or the material is circulated, close the first venting electrically controlled ball valve 26 to prevent the material from flowing out); after the sampling tank 21 is full, close the first electrically controlled ball valve 23 and the second electrically controlled ball valve 25, open the fifth electrically controlled ball valve 421 and the first venting electrically controlled ball valve 26, so that the material in the sampling tank 21 (quantitative, such as 139ml) flows into the mixing unit 4 to achieve sampling; after all the material in the sampling tank 21 is emptied, repeat the above operation.

[0024] The liquid preparation unit 3 includes a high-level tank 31, an inlet pipe 32 connected to the lower part of the high-level tank 31 at one end (the other end of the inlet pipe 32 can be connected to the owner's water supply device, such as the existing demineralized water tank 2'), an overflow pipe 33 connected to the upper part of the high-level tank 31 at one end and connected to the inlet pipe 32 at the other end (in this way, the overflow water of the high-level tank 31 flows into the inlet pipe 32, thereby realizing the recycling of the overflow water; the specifications of the inlet pipe 32 and the overflow pipe 33 can be conventionally selected according to actual needs, preferably DN10 stainless steel pipes), and a first level gauge 38 installed in the high-level tank 31. A third electrically controlled ball valve 34 is installed on the inlet pipe 32, and a fourth electrically controlled ball valve 39 is installed on the overflow pipe 33. In this embodiment, the liquid preparation unit 3 also includes a pipeline booster pump 36 installed on the inlet pipe 32 and upstream of the third electrically controlled ball valve 34, a ninth electrically controlled ball valve 37 installed on the inlet pipe 32 and upstream of the pipeline booster pump 36, and a pressure gauge 35 installed on the inlet pipe 32 and located between the pipeline booster pump 36 and the third electrically controlled ball valve 34. The connection between the overflow pipe 33 and the inlet pipe 32 is located between the ninth electrically controlled ball valve 37 and the pipeline booster pump 36. That is, the inlet pipe 32 is sequentially equipped with the ninth electrically controlled ball valve 37, the pipeline booster pump 36, the pressure gauge 35, and the third electrically controlled ball valve 34 in the direction from the demineralized water tank 2' to the high-level tank 31. In addition, various conventional valves can be added to the inlet pipe 32 according to actual needs to enrich or optimize the control functions of the density liquid preparation unit 3.

[0025] The function of the liquid preparation unit 3 is to provide a certain volume of water to mix with the ammonium nitrate solution to form a diluted ammonium nitrate solution of the required concentration (e.g., a mass concentration of 10%, which can be set conventionally according to actual needs). In this embodiment, the high-level tank 31 is preferably an N80 seamless stainless steel pipe with an outer diameter of 89mm, a wall thickness of 4.0mm, an inner diameter of 81mm, and a net height of 420mm inside the tank. A second vent pipe with a specification of DN10 is installed on its top, and a second vent solenoid ball valve is installed on the second vent pipe.

[0026] In this application, the working principle of the liquid preparation unit 3 is basically the same as that of the sampling unit 2: the sixth electrically controlled ball valve 431 (described below) is closed, and the third electrically controlled ball valve 34 and the fourth electrically controlled ball valve 39 are opened (the second venting electrically controlled ball valve is temporarily opened to remove air from the high-level tank 31. After the air is vented or the material is circulated, the second venting electrically controlled ball valve is closed to prevent the material from flowing out); when the liquid level in the high-level tank 31 reaches the required level (indicated by the first liquid level gauge 38, which can be obtained by combining the concentration calculation result with the aforementioned parameters of the high-level tank 31) or when the high-level tank 31 is full (or indicated by the first liquid level gauge 38), the third electrically controlled ball valve 34 and the fourth electrically controlled ball valve 39 are closed; the sixth electrically controlled ball valve 431 and the second venting electrically controlled ball valve are opened, so that the material (water) in the high-level tank 31 flows into the mixing unit 4 to be mixed with the aforementioned ammonium nitrate solution to dilute it to the corresponding concentration. A more preferable method is to: Pour material (water) into the high-level tank 31 until water overflows from the overflow pipe 33; close the third and fourth electrically controlled ball valves 34 and 39; and open the sixth and second venting ball valves 431, allowing some of the material (water) in the high-level tank 31 to flow into the proportioning unit 4. At this point, pay attention to the difference in liquid level drop indicated by the first level gauge 38. This precise control of the difference in liquid level drop allows for precise control of the volume of material (water) conveyed into the high-level tank 31, thereby accurately diluting the ammonium nitrate solution. This control method is more accurate than the previously described method. After all or part of the material in the high-level tank 31 has been emptied, repeat the above operation.

[0027] The mixing unit 4 is used to receive the ammonium nitrate solution delivered by the sampling unit 2 and the water delivered by the solution preparation unit 3, thereby mixing them to form a diluted solution (the concentration of the diluted solution can be conventionally adjusted according to the volume of water delivered by the solution preparation unit 3, such as 10wt%). The mixing unit 4 includes a mixing tank 41 with a vent hole at the top, a discharge pipe 42 connected at one end to the bottom of the sampling tank 21 and at the other end to the mixing tank 41, a water outlet pipe 43 connected at one end to the bottom of the high-level tank 31 and at the other end to the mixing tank 41, and a second thermometer 46, a pH meter 47 and a second level gauge 44 installed in the mixing tank 41. A fifth electrically controlled ball valve 421 is installed on the discharge pipe 42, and a sixth electrically controlled ball valve 431 is installed on the water outlet pipe 43. In this embodiment, to accelerate the mixing speed, the proportioning unit 4 further includes an aeration mechanism 45, which includes an air pump 452 and an aeration pipe 451 connected at one end to the air pump 452 and extending to the bottom of the proportioning tank 41 at the other end. Specifically, the aeration pipe 451 includes a first pipe body 4511 connected at one end to the air pump 452 and extending to the bottom of the proportioning tank 41 at the other end, and an air outlet ring 4512 formed at the other end of the pipe body 4511 and having multiple air outlet holes 4513 (e.g., Figure 6As shown), aeration is introduced into the mixing tank 41 to accelerate the mixing speed; while the discharge pipe 42 includes a second pipe body 4211 with one end connected to the bottom of the sampling tank 21 and the other end extending into the mixing tank 41 (extending to the bottom of the mixing tank 41) and multiple discharge holes 4212 opened at the other end of the second pipe body 4211, which also accelerates the mixing speed (e.g. Figure 5 (As shown). In this embodiment, a second manual sampling branch pipe 48 (with a valve installed on it) is also installed on the mixing tank 41 to facilitate manual sampling.

[0028] The ammonium nitrate solution sampling device also includes a draining unit 5. The draining unit 5 includes a drain pipe 51 connected at one end to the bottom of the mixing tank 41 and at the other end to the inlet pipe 32; a seventh electrically controlled ball valve 52 installed on the drain pipe 51; a return pipe 53 connected at one end to the inlet pipe 32 and at the other end to the circulation pipe 12'; and an eighth electrically controlled ball valve 54 and a second check valve 55 installed on the return pipe 53 and arranged sequentially. At this time, the connection between the drain pipe 51 and the inlet pipe 32 is located between the ninth electrically controlled ball valve 37 and the pipeline booster pump 36, and preferably upstream of the connection between the overflow pipe 33 and the inlet pipe 32. The connection between the return pipe 53 and the inlet pipe 32 is located between the third electrically controlled ball valve 34 and the pressure gauge 35, and the connection between the return pipe 53 and the circulation pipe 12' is upstream of the circulation pump 13' (preferably upstream of the connection between the other end of the first measuring connection pipe 11 and the circulation pipe 12'). Thus, by closing the fifth solenoid ball valve 421 and the sixth solenoid ball valve 431, and opening the seventh solenoid ball valve 52, the mixed solution (diluted ammonium nitrate solution) contained in the mixing tank 41 can be discharged into the inlet pipe 32 through the drain pipe 51 (at this time, the third solenoid ball valve 34 and the ninth solenoid ball valve 37 need to be closed), and then fed into the circulation pipe 12' through the return pipe 53, realizing the recovery of the diluted ammonium nitrate solution (since the volume of the diluted ammonium nitrate solution is very small relative to the volume of the ammonium nitrate solution stored in the tank 11', the recovery of the diluted ammonium nitrate solution has little impact on its performance). In addition, various conventional valves can be added to the return pipe 53 according to actual needs to enrich or optimize the control function of the return pipe 53.

[0029] The ammonium nitrate solution sampling device also includes a rinsing unit, which includes a rinsing drain pipe 6 connected at one end to the inlet pipe 32 and at the other end to the first measuring connection pipe 11. The connection point between one end of the rinsing drain pipe 6 and the inlet pipe 32 is located upstream of the connection point between the return pipe 53 and the inlet pipe 32 (i.e., between the connection point between the return pipe 53 and the inlet pipe 32 and the pressure gauge 35). The connection point between the other end of the rinsing drain pipe 6 and the first measuring connection pipe 11 is located upstream of the first pressure reducing valve 12. Through the control of the aforementioned valves (such as closing the first check valve 15, the third electric ball valve 34, the second electric ball valve 25, etc.), water in the desalination tank 2' is introduced into the mixing tank 41 for rinsing (especially the pH meter 47), and then fed into the circulation pipe 12' through the draining unit 5. A third check valve 62 and an eighth electrically controlled ball valve 61 are installed on the flushing drain pipe 6 (both the third check valve 62 and the eighth electrically controlled ball valve 61 are installed near the first measuring connection pipe 11, with the third check valve 62 being closer to the first measuring connection pipe 11). This flushing unit achieves the cleaning function, preventing crystallization and blockage of the sampling equipment; moreover, the easily damaged pH meter 47 can avoid prolonged immersion in ammonium nitrate solution, achieving maintenance-free operation and long-term use. In this application, it is also preferable to connect the aforementioned valves to a PLC controller, using the PLC controller to achieve automated control of the ammonium nitrate solution sampling equipment and continuous periodic pH measurement.

[0030] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An ammonium nitrate solution sampling device, wherein the ammonium nitrate solution is stored in a storage tank (1'), the storage tank (1') comprising a tank body (11'), a circulation pipe (12') installed on the tank body (11'), and a circulation pump (13') installed on the circulation pipe (12'), characterized in that it include: Density measuring unit (1), the density measuring unit (1) includes a first measuring connecting pipe (11) and a density meter (14) installed on the first measuring connecting pipe (11); both ends of the first measuring connecting pipe (11) are connected to the circulation pipe (12') and are respectively located on both sides of the circulation pump (13'); The sampling unit (2) includes a sampling tank (21), an inlet pipe (22) with one end connected to the lower part of the sampling tank (21) and the other end connected to the connecting pipe (11), and an overflow pipe (24) with one end connected to the upper part of the sampling tank (21) and the other end connected to the connecting pipe (11). A first electrically controlled ball valve (23) is installed on the inlet pipe (22), and a second electrically controlled ball valve (25) is installed on the overflow pipe (24). Liquid preparation unit (3), the liquid preparation unit (3) includes a high-level tank (31), an inlet pipe (32) connected to the lower part of the high-level tank (31) at one end, an overflow pipe (33) connected to the upper part of the high-level tank (31) at one end and connected to the inlet pipe (32) at the other end, and a first level gauge (38) installed in the high-level tank (31). A third electrically controlled ball valve (34) is installed on the inlet pipe (32), and a fourth electrically controlled ball valve (39) is installed on the overflow pipe (33). The mixing unit (4) includes a mixing tank (41) with a vent hole at the top, a discharge pipe (42) connected at one end to the bottom of the sampling tank (21) and at the other end to the mixing tank (41), a water outlet pipe (43) connected at one end to the bottom of the high-level tank (31) and at the other end to the mixing tank (41), and a second thermometer (46), a pH meter (47) and a second level gauge (44) installed in the mixing tank (41). A fifth electrically controlled ball valve (421) is installed on the discharge pipe (42), and a sixth electrically controlled ball valve (431) is installed on the water outlet pipe (43).

2. The ammonium nitrate solution sampling device according to claim 1, characterized in that: One end of the first measuring connecting pipe (11) is connected to the circulation pipe (12') and is located downstream of the circulation pump (13'), while the other end is connected to the circulation pipe (12') and is located upstream of the circulation pump (13').

3. The ammonium nitrate solution sampling device according to claim 1 or 2, characterized in that: The density measuring unit (1) further includes a first pressure reducing valve (12) installed on the first measuring connecting pipe (11) and located upstream of the densitometer (14), a first check valve (15) installed on the first measuring connecting pipe (11) and located downstream of the densitometer (14), and a first thermometer (13) installed on the first measuring connecting pipe (11) and located between the densitometer (14) and the first pressure reducing valve (12).

4. The ammonium nitrate solution sampling device according to claim 3, characterized in that: The connection between the inlet pipe (22) and the connecting pipe (11) is located between the densitometer (14) and the first pressure reducing valve (12); the connection between the overflow pipe (24) and the connecting pipe (11) is located downstream of the densitometer (14).

5. The ammonium nitrate solution sampling device according to claim 1, characterized in that: The liquid preparation unit (3) also includes a pipeline booster pump (36) installed on the water inlet pipe (32) and located upstream of the third electrically controlled ball valve (34), a ninth electrically controlled ball valve (37) installed on the water inlet pipe (32) and located upstream of the pipeline booster pump (36), and a pressure gauge (35) installed on the water inlet pipe (32) and located between the pipeline booster pump (36) and the third electrically controlled ball valve (34). The connection between the overflow pipe (33) and the water inlet pipe (32) is located between the ninth electrically controlled ball valve (37) and the pipeline booster pump (36).

6. The ammonium nitrate solution sampling device according to claim 1, characterized in that: The proportioning unit (4) further includes an aeration mechanism (45), which includes an air pump (452) and an aeration pipe (451) with one end connected to the air pump (452) and the other end extending into the proportioning tank (41).

7. The ammonium nitrate solution sampling device according to claim 6, characterized in that: The aeration pipe (451) includes a first pipe body (4511) with one end connected to the air pump (452) and the other end extending to the bottom of the mixing tank (41), and an air outlet ring (4512) formed at the other end of the pipe body (4511) and having a plurality of air outlet holes (4513). The discharge pipe (42) includes a second pipe body (4211) with one end connected to the bottom of the sampling tank (21) and the other end extending to the bottom of the mixing tank (41), and a plurality of discharge holes (4212) opened at the other end of the second pipe body (4211).

8. The ammonium nitrate solution sampling device according to claim 5, characterized in that, It also includes: The draining unit (5) includes a draining pipe (51) with one end connected to the bottom of the mixing tank (41) and the other end connected to the inlet pipe (32), a seventh electrically controlled ball valve (52) installed on the draining pipe (51), a return water pipe (53) with one end connected to the inlet pipe (32) and the other end connected to the circulation pipe (12'), and an eighth electrically controlled ball valve (54) and a second check valve (55) installed on the return water pipe (53) and arranged in sequence. The connection between the drain pipe (51) and the inlet pipe (32) is located between the ninth electrically controlled ball valve (37) and the pipeline booster pump (36); The connection between the return water pipe (53) and the inlet water pipe (32) is located between the third electrically controlled ball valve (34) and the pressure gauge (35). The connection between the return water pipe (53) and the circulation pipe (12') is located upstream of the circulation pump (13').

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