Online monitoring and adjusting device for pH value of high-temperature and high-concentration ammonium nitrate solution

Abstract

The invention discloses an online monitoring and adjusting device for the pH value of a high-temperature high-concentration ammonium nitrate solution. The online monitoring and adjusting device is used for detecting the pH value of an ammonium nitrate hot concentrated solution in a storage tank body. An ammonium nitrate solution feeding pipe and an acidic regulating liquid feeding assembly are arranged at the top of the storage tank body, an ammonium nitrate solution discharging pipe and an alkaline regulating liquid feeding assembly are arranged at the bottom of the storage tank body, and a solution circulating structure comprising a solution circulating pipeline, a one-way pump and a pH value testing assembly which are communicated with the tank body is arranged on the outer side wall of the storage tank body; the solution circulating pipeline is provided with a one-way pump and a pH value testing assembly, and the pH value testing assembly is used for statically detecting the pH value of the ammonium nitrate solution. Real-time monitoring of the pH value of the ammonium nitrate solution and automatic quantitative adjustment after deviation of the pH value are achieved, the accuracy of adjustment of the pH value of the ammonium nitrate solution is guaranteed, and real-time monitoring of the pH value of the high-temperature and high-concentration ammonium nitrate solution is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of ammonium nitrate pH value testing, and in particular to an online monitoring and regulating device for the pH value of a high-temperature and high-concentration ammonium nitrate solution. Background Art

[0002] At present, in the storage link of high-temperature ammonium nitrate solution at home and abroad, its pH value adopts sampling test method, that is, a small amount of sample is taken from the high-temperature ammonium nitrate solution storage tank, cooled to room temperature, and then diluted to 10% concentration with deionized water, and then tested with a pH meter. In the prior art, when testing high-temperature ammonium nitrate solution, multiple links such as sampling, transfer, dilution and testing are involved, and the detection process is long, which is not conducive to real-time monitoring of the pH value of the ammonium nitrate solution, and it is even more impossible to achieve fully automatic quantitative adjustment.

[0003] Regarding the detection of the pH value of ammonium nitrate solution, Chinese patent CN201710827314.2 discloses a method for detecting whether the pH value of ammonium nitrate solution in emulsion explosive is qualified, which specifically discloses a method for detection using a pH indicator. This method also requires sampling, cooling, and dilution, cannot be automated and continuous, and has low work efficiency; Chinese patent CN201410010939.6 discloses a method for detecting and adjusting the pH of ammonium nitrate solution used in the production of emulsion explosives, which specifically discloses an online monitoring method for ammonium nitrate solution, but this method requires the solution to be pre-cooled to about 90°C and then the pH value of the solution is measured in a flowing state. After multiple tests, it was found that a large amount of crystals will appear in the commercially available high-concentration ammonium nitrate solution at this temperature, and the flowing state has a great influence on the pH value of the hot concentrated ammonium nitrate solution, resulting in a large deviation in the measurement result.

[0004] Therefore, it is urgent to propose an online monitoring and adjustment device for the pH value of a high-temperature and high-concentration ammonium nitrate solution to realize real-time monitoring of the high-temperature ammonium nitrate solution, thereby adjusting the pH value of the high-temperature ammonium nitrate solution in real time. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides an online monitoring and adjustment device for the pH value of a high-temperature and high-concentration ammonium nitrate solution, which realizes real-time monitoring and precise adjustment of the pH value of a high-temperature and high-concentration ammonium nitrate solution inside a storage tank.

[0006] The present invention adopts the following technical solutions:

[0007] An online pH value monitoring and regulating device for a high-temperature and high-concentration ammonium nitrate solution is used to detect the pH value of a hot concentrated ammonium nitrate solution in a storage tank body. An ammonium nitrate solution feed pipe and an acidic regulating liquid feed assembly are arranged on the top of the storage tank body, an ammonium nitrate solution discharge pipe and an alkaline regulating liquid feed assembly are arranged on the bottom of the storage tank body, and a solution circulation structure is arranged on one side of the storage tank body;

[0008] The solution circulation structure includes a solution circulation pipeline, a one-way pump and a pH value testing component;

[0009] The solution circulation pipeline comprises a first circulation pipe section, a second circulation pipe section and a third circulation pipe section, wherein the first circulation pipe section is connected to the lower part of the storage tank body, the third circulation pipe section is connected to the upper part of the storage tank body, and the second circulation pipe section is used to connect the first circulation pipe section and the third circulation pipe section;

[0010] The one-way pump is located and installed at one end of the first circulation pipe section close to the storage tank body;

[0011] The second circulation pipe section is provided with a pH value testing component for detecting the pH value of the ammonium nitrate solution.

[0012] Preferably, the acidic regulating liquid feed assembly comprises an acidic regulating liquid feed pipe and an acidic regulating liquid nozzle installed at the end of the acidic regulating liquid feed pipe; the alkaline regulating liquid feed assembly comprises an alkaline regulating liquid feed pipe and an alkaline regulating liquid nozzle installed at the end of the alkaline regulating liquid feed pipe.

[0013] Preferably, the first circulation pipe section of the solution circulation pipeline is horizontally inclined downward, the third circulation pipe section is horizontally inclined upward, and the second circulation pipe section is installed in a vertical direction.

[0014] Preferably, the outer wall of the solution circulation pipeline and the outer wall of the pH value testing component are both wrapped with a polymer insulation layer, and the polymer insulation layer is wrapped with a stainless steel protective layer.

[0015] Preferably, the pH testing component includes a pH testing pipeline and a high-temperature pH meter. The pH testing pipeline is connected to the second circulation pipe section and has a closed top. A test control valve is provided on the pH testing pipeline. A high-temperature pH meter is provided on the top of the pH testing pipeline. A drain port and a flushing port are provided on the pH testing pipeline. The drain port is provided at the bottom of the side wall of the pH testing pipeline and is connected to a drain collection bucket through a drain pipe. The flushing port is provided at the top of the side wall of the pH testing pipeline. The flushing port is connected to a hot water pipe through a flushing pipe. A control valve is provided on the flushing pipe to avoid the discharge of ammonium nitrate solution into the external environment and affecting the external environment during the detection process.

[0016] Preferably, the side wall of the storage tank is provided with a stainless steel inner wall, a high-pressure steam coil, an organic polymer insulation layer and a stainless steel protective layer in sequence from the inside to the outside; the high-pressure steam coil is wound inside the tank wall and is made of stainless steel.

[0017] Preferably, a stirring assembly is provided in the storage tank body, and a liquid level meter and a temperature sensor are provided on the inner wall of the storage tank body.

[0018] Preferably, it also includes a control system, which includes a central processing system, a liquid level and pH value acquisition module, a pH value conversion module, an acid-base deviation determination module and a pH value adjustment module, and the liquid level and pH value acquisition module, the pH value conversion module, the acid-base deviation determination module and the pH value adjustment module are respectively connected to the central processing system;

[0019] in,

[0020] The liquid level and pH value acquisition module is connected to the liquid level meter and the high-temperature pH meter respectively, and is used to collect the liquid level height in the storage tank and the pH value detected by the high-temperature pH meter; the liquid level and pH value acquisition module transmits the detected liquid level height and pH value to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion;

[0021] The pH value conversion module is used to convert the pH value detected by the high-temperature pH meter into the corresponding pH value after dilution under normal temperature conditions; the pH value conversion module transmits the converted pH value of the ammonium nitrate solution to the central processing system for storage, and the central processing module sends the converted pH value of the ammonium nitrate solution to the acid-base deviation determination module for acid-base deviation determination;

[0022] The acid-base deviation determination module is used to compare the pH value converted by the pH value conversion module with the preset value to determine whether there is a safety hazard in the storage process of the ammonium nitrate solution. If the pH value of the ammonium nitrate solution after conversion exceeds the safety range, a pH value adjuster is added; the acid-base deviation determination module feeds back the determination result to the central processing system, and the central processing system transmits the determination result of the acid-base deviation determination module, the pH value of the high-temperature and high-concentration ammonium nitrate solution, and the liquid level height inside the storage tank to the pH value adjustment module, and the pH value adjustment module controls the pH value adjustment module to add an acidic adjustment liquid or an alkaline adjustment liquid into the storage tank to adjust the pH value of the ammonium nitrate solution;

[0023] The pH value adjustment module is used to determine the injection amount of the acidic adjustment liquid or the alkaline adjustment liquid according to the judgment result of the acid-base deviation judgment module and the pH value of the high-temperature and high-concentration ammonium nitrate solution using the injection amount calculation formula, and add the acidic adjustment liquid or the alkaline adjustment liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution.

[0024] Preferably, a pH value conversion formula is provided in the pH value conversion module;

[0025] When pH < 2.02, the pH value conversion formula is:

[0026] y = 8.14x- 11.51 (1)

[0027] When pH>2.02, the pH value conversion formula is:

[0028] y = 11.11x - 17.40 (2)

[0029] In the formula,

[0030] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0031] y—pH value after dilution at room temperature.

[0032] Preferably, the judgment condition in the acid-base deviation judgment module is:

[0033] If the pH value converted by the pH conversion module is 5.0±0.5, it is judged that there is no safety hazard; if the pH value converted by the pH conversion module is less than 4.5 or greater than 5.5, it is judged that the pH value deviates and needs to be adjusted; if the pH value is less than 3.5 or greater than 6.5, it is judged that there is a serious safety hazard and the ammonium nitrate solution in the storage tank needs to be immediately drained.

[0034] Preferably, when the pH value adjustment module adds acidic adjusting liquid or alkaline adjusting liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution according to the judgment result of the acid-base deviation judgment module, the injection amount of the acidic adjusting liquid or alkaline adjusting liquid injected into the storage tank body is determined in combination with the pH value of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height inside the storage tank, and the concentration of the acidic adjusting liquid or the alkaline adjusting liquid.

[0035] Preferably, the calculation formula for the injection amount of the alkaline regulating solution is:

[0036]

[0037] In the formula,

[0038] z1—the amount of alkaline regulating solution injected, in kg;

[0039] D—tank diameter, in m;

[0040] H—liquid level height, in m;

[0041] x—pH value of high temperature and high concentration ammonium nitrate solution.

[0042] Preferably, the calculation formula for the injection amount of the acidic regulating liquid is:

[0043]

[0044] In the formula,

[0045] z2—injection amount of acidic regulating liquid, in kg;

[0046] D—tank diameter, in m;

[0047] H—liquid level height, in m;

[0048] x—pH value of high temperature and high concentration ammonium nitrate solution.

[0049] The beneficial effects of the present invention are:

[0050] (1) The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution proposed by the present invention provides a pH value testing pipeline on one side of a solution circulation pipeline, and detects the pH value of the high-temperature and high-concentration ammonium nitrate solution in the pH value testing pipeline, thereby ensuring that the high-temperature and high-concentration ammonium nitrate solution remains stationary during the detection process, thereby avoiding the influence of the flow of the high-temperature and high-concentration ammonium nitrate solution on the measured pH value during the detection process.

[0051] (2) The present invention utilizes the pH conversion formula preset in the pH conversion module to realize the conversion of the pH value before and after dilution of the high-temperature and high-concentration ammonium nitrate solution, and proposes a safe range of the pH value of the high-temperature and high-concentration ammonium nitrate solution, thereby providing technical support for the online monitoring of the pH value of the high-temperature and high-concentration ammonium nitrate solution.

[0052] (3) According to the relationship between the pH value of the high-temperature and high-concentration ammonium nitrate solution and the concentration of the acidic / alkaline regulating solution, the present invention establishes the relationship between the pH value of the high-temperature and high-concentration ammonium nitrate solution and the injection amount of the alkaline regulating solution, as well as the relationship between the pH value of the high-temperature and high-concentration ammonium nitrate solution and the injection amount of the acidic regulating solution, thereby realizing automatic quantitative adjustment of the pH value of the high-temperature and high-concentration ammonium nitrate solution after deviation, ensuring the accuracy of the pH value adjustment of the high-temperature and high-concentration ammonium nitrate solution, and facilitating the real-time monitoring of the pH value of the high-temperature and high-concentration ammonium nitrate solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 The present invention is a schematic structural diagram of an online pH value monitoring and regulating device for a high-temperature and high-concentration ammonium nitrate solution located outside a storage tank.

[0055] Figure 2 The present invention is a schematic structural diagram of the device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution located inside a storage tank.

[0056] Figure 3 It is a schematic diagram of the alkaline regulating solution feeding assembly of the present invention.

[0057] Figure 4 It is a schematic diagram of the structure of the pH value testing component of the present invention.

[0058] Figure 5 It is a structural schematic diagram of the control system of the present invention.

[0059] In the figure, 1. storage tank body, 11. stirring assembly, 12. liquid level gauge, 13. temperature sensor, 2. high-pressure steam coil, 3. ammonium nitrate solution feed pipe, 4. ammonium nitrate solution discharge pipe, 5. acidic regulating liquid feed assembly, 51. acidic regulating liquid feed pipe, 52. acidic regulating liquid nozzle, 6. alkaline regulating liquid feed assembly, 61. alkaline regulating liquid feed pipe, 62. alkaline regulating liquid nozzle, 7. solution circulation structure, 71. first circulation pipeline, 72. second circulation pipeline, 73. third circulation pipeline, 74. pH value test pipeline, 75. test control valve, 77. high temperature pH meter, 8. one-way pump. DETAILED DESCRIPTION

[0060] The present invention provides an online monitoring and regulating device for the pH value of a high-temperature and high-concentration ammonium nitrate solution. In order to make the purpose, technical scheme and effect of the present invention clearer and more specific, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0061] The present invention is described in detail below with reference to the accompanying drawings.

[0062] Example 1

[0063] An online pH value monitoring and adjustment device for high-temperature and high-concentration ammonium nitrate solution is used to detect the pH value of the hot concentrated ammonium nitrate solution in the tank body. Figure 1 shown.

[0064] The side wall of the storage tank is provided with a stainless steel inner wall, a high-pressure steam coil 2, an organic polymer insulation layer and a stainless steel protective layer in sequence from the inside to the outside. The high-pressure steam coil is wound inside the tank wall and is made of stainless steel.

[0065] The top of the storage tank body 1 is provided with an ammonium nitrate solution feed pipe 3 and an acidic regulating liquid feed assembly 5, wherein the acidic regulating liquid feed assembly 5 comprises an acidic regulating liquid feed pipe 51 and an acidic regulating liquid nozzle 52 installed at the end of the acidic regulating liquid feed pipe. Figure 2 As shown, the acidic regulating liquid spray head 52 is configured as a shower head with a conical structure, and a plurality of acidic regulating liquid spray holes are evenly arranged at the bottom of the conical structure for evenly spraying the acidic regulating liquid in the ammonium nitrate solution.

[0066] The bottom of the storage tank body is provided with an ammonium nitrate solution discharge pipe 4 and an alkaline regulating liquid feed assembly 6, wherein the alkaline regulating liquid feed assembly 6 comprises an alkaline regulating liquid feed pipe 61 and an alkaline regulating liquid nozzle 62 installed at the end of the alkaline regulating liquid feed pipe. Figure 3 As shown, the alkaline regulating liquid nozzle 62 is configured as an arc-shaped circular tube structure, which is made of stainless steel material. A plurality of alkaline regulating liquid spraying holes are evenly arranged on the top of the arc-shaped circular tube for evenly spraying the alkaline regulating liquid in the ammonium nitrate solution.

[0067] A solution circulation structure 7 is provided on one side of the storage tank body, a stirring assembly 11 is provided in the storage tank body, a liquid level meter 12 and a temperature sensor 13 are provided on the inner wall of the storage tank body, and in this embodiment, four temperature sensors are evenly arranged along the circumferential direction on the inner wall of the storage tank body.

[0068] The solution circulation structure 7 includes a solution circulation pipeline, a one-way pump 8 and a pH value testing component. The solution circulation pipeline includes a first circulation pipeline section 71, a second circulation pipeline section 72 and a third circulation pipeline section 73, wherein the first circulation pipeline section 71 is connected to the lower part of the storage tank body, the third circulation pipeline section 73 is connected to the upper part of the storage tank body, and the second circulation pipeline section 72 is used to connect the first circulation pipeline section and the third circulation pipeline section. The solution circulation pipeline is made of stainless steel material, the first circulation pipeline section of the solution circulation pipeline is horizontally inclined downward, the third circulation pipeline section is horizontally inclined upward, and the second circulation pipeline section is installed in a vertical direction. The outer walls of the first circulation pipeline section, the second circulation pipeline section, the third circulation pipeline section and the pH value testing component are all wrapped with a polymer insulation layer, and the polymer insulation layer is wrapped with a stainless steel protective layer. The one-way pump 8 is located at one end of the first circulation pipeline section installed near the storage tank body; the pH value testing component is installed on the second circulation pipeline section for detecting the pH value of the ammonium nitrate solution.

[0069] The pH value testing assembly includes a pH value testing pipeline 74 and a high temperature pH meter 77. Figure 4 As shown, a test control valve 75 is provided on the pH value test pipeline 74, the top of the pH value test pipeline is closed, and a high-temperature pH meter is provided on the top of the pH value test pipeline. In this embodiment, the high-temperature pH meter has the characteristics of acid resistance, corrosion resistance and high temperature resistance, and the working temperature can reach up to 130°C. A drain port and a flush port are provided on the pH value test pipeline. The drain port is provided at the bottom of the side wall of the pH value test pipeline and is connected to the drain collection bucket through a drain pipe. The flush port is provided at the top of the side wall of the pH value test pipeline. The flush port is connected to the hot water pipe through a flushing pipe. A control valve is provided on the flushing pipe to avoid the discharge of ammonium nitrate solution into the external environment during the detection process to affect the external environment.

[0070] The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution in this embodiment also includes a control system, such as Figure 5As shown, it also includes a control system, which includes a central processing system, a liquid level and pH value acquisition module, a pH value conversion module, an acid-base deviation judgment module and a pH value adjustment module. The liquid level and pH value acquisition module, the pH value conversion module, the acid-base deviation judgment module and the pH value adjustment module are respectively connected to the central processing system.

[0071] in,

[0072] The liquid level and pH value acquisition module is connected to the liquid level meter and the high-temperature pH meter respectively, and is used to collect the liquid level height in the storage tank and the pH value detected by the high-temperature pH meter; the liquid level and pH value acquisition module transmits the detected liquid level height and pH value to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion;

[0073] The pH value conversion module is used to convert the pH value detected by the high-temperature pH meter into the corresponding pH value after dilution under normal temperature conditions; the pH value conversion module transmits the converted pH value of the ammonium nitrate solution to the central processing system for storage, and the central processing module sends the converted pH value of the ammonium nitrate solution to the acid-base deviation determination module for acid-base deviation determination;

[0074] The acid-base deviation determination module is used to compare the pH value converted by the pH value conversion module with the preset value to determine whether there is a safety hazard in the storage process of the ammonium nitrate solution. If the pH value of the ammonium nitrate solution after conversion exceeds the safety range, a pH value adjuster is added; the acid-base deviation determination module feeds back the determination result to the central processing system, and the central processing system transmits the determination result of the acid-base deviation determination module, the pH value of the high-temperature and high-concentration ammonium nitrate solution, and the liquid level height inside the storage tank to the pH value adjustment module, and the pH value adjustment module controls the pH value adjustment module to add an acidic adjustment liquid or an alkaline adjustment liquid into the storage tank to adjust the pH value of the ammonium nitrate solution;

[0075] The pH value adjustment module is used to determine the injection amount of the acidic adjustment liquid or the alkaline adjustment liquid according to the judgment result of the acid-base deviation judgment module and the pH value of the high-temperature and high-concentration ammonium nitrate solution using the injection amount calculation formula, and add the acidic adjustment liquid or the alkaline adjustment liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution.

[0076] The pH value conversion formula preset in the pH value adjustment module in this embodiment;

[0077] When pH < 2.02, the pH value conversion formula is:

[0078] y = 8.14x- 11.51 (1)

[0079] When pH>2.02, the pH value conversion formula is:

[0080] y = 11.11x - 17.40 (2)

[0081] In the formula,

[0082] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0083] y—pH value after dilution at room temperature.

[0084] The acid-base deviation judgment module has preset judgment conditions. In this embodiment, the judgment conditions are:

[0085] If the pH value converted by the pH conversion module is 5.0±0.5, it is judged that there is no safety hazard; if the pH value converted by the pH conversion module is less than 4.5 or greater than 5.5, it is judged that the pH value deviates and needs to be adjusted; if the pH value is less than 3.5 or greater than 6.5, it is judged that there is a serious safety hazard and the ammonium nitrate solution in the storage tank needs to be immediately drained.

[0086] When the pH value adjusting module adds acidic adjusting liquid or alkaline adjusting liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution according to the judgment result of the acid-base deviation judgment module, the injection amount of the acidic adjusting liquid or alkaline adjusting liquid injected into the storage tank body is determined according to the pH value of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height inside the storage tank, and the concentration of the acidic adjusting liquid or the alkaline adjusting liquid. The pH value adjusting module is used to control the acidic adjusting liquid feeding component or the alkaline adjusting liquid feeding component to inject the acidic adjusting liquid or the alkaline adjusting liquid into the storage tank body, so as to adjust the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the tank body to within a preset safety range, thereby ensuring the storage safety of the high-temperature and high-concentration ammonium nitrate solution.

[0087] In this embodiment, the injection amount calculation formula preset in the pH value adjustment module includes an alkaline adjustment liquid injection amount calculation formula and an acidic adjustment liquid injection amount calculation formula.

[0088] in,

[0089] The calculation formula for the injection amount of the alkaline regulating solution is:

[0090]

[0091] In the formula,

[0092] z1—the amount of alkaline regulating solution injected, in kg;

[0093] D—tank diameter, in m;

[0094] H—liquid level height, in m;

[0095] x—pH value of high temperature and high concentration ammonium nitrate solution.

[0096] The calculation formula for the injection amount of the acidic regulating liquid is:

[0097]

[0098] In the formula,

[0099] z2—injection amount of acidic regulating liquid, in kg;

[0100] D—tank diameter, in m;

[0101] H—liquid level height, in m;

[0102] x—pH value of high temperature and high concentration ammonium nitrate solution.

[0103] Example 2

[0104] In this embodiment, the online monitoring and regulating device for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Embodiment 1 is used to actually apply the online monitoring and regulating device for the pH value of the high-temperature and high-concentration ammonium nitrate solution to the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the storage tank, specifically comprising the following steps:

[0105] Step 1, preheating the storage tank, using a high-pressure steam coil disposed in the tank wall to heat the inside of the storage tank, thereby increasing the storage temperature inside the storage tank to avoid overall or partial crystallization of the ammonium nitrate solution inside the storage tank. When the storage tank is empty, high-pressure steam is continuously introduced into the high-pressure steam coil, and the high-pressure steam coil is used to heat the internal temperature of the storage tank to a preset safe storage temperature of the ammonium nitrate solution, thereby completing the preheating of the storage tank before the ammonium nitrate solution is injected.

[0106] Step 2, open the ammonium nitrate solution feed pipe, use the ammonium nitrate solution feed pipe to inject the high-temperature and high-concentration ammonium nitrate solution into the storage tank, and at the same time, open the stirring component in the storage tank body to keep the high-temperature and high-concentration ammonium nitrate solution in a flowing state at all times, so as to avoid the high-temperature and high-concentration ammonium nitrate solution from precipitating crystal particles and accumulating in the storage tank due to loss of temperature. During the injection of the high-temperature and high-concentration ammonium nitrate solution, use the liquid level gauge on the inner wall of the storage tank to monitor the liquid level in the storage tank in real time. After the injection is completed, close the ammonium nitrate solution feed pipe and stop injecting the high-temperature and high-concentration ammonium nitrate solution into the storage tank.

[0107] Step 3, in order to ensure the uniformity of the high-temperature and high-concentration ammonium nitrate solution in the storage tank in the vertical direction, open the solution circulation structure, and use the one-way pump provided in the solution circulation structure to extract the high-temperature and high-concentration ammonium nitrate solution from the bottom of the storage tank. After the extracted high-temperature and high-concentration ammonium nitrate solution flows through the solution circulation pipeline, it is re-injected into the storage tank from the top of the storage tank.

[0108] Step 4, according to the set monitoring time, the pH value of the high-temperature and high-concentration ammonium nitrate solution in the storage tank is tested at regular intervals, and the pH value of the high-temperature and high-concentration ammonium nitrate solution is tested using the pH value testing component. During the test, the test control valve is converted from a closed state to an open state. After the high-temperature and high-concentration ammonium nitrate solution enters the pH value testing pipeline, the test control valve is closed to form a closed space in the pH value testing pipeline. The pH value of the high-temperature and high-concentration ammonium nitrate solution is measured using a high-temperature pH meter in the pH value testing pipeline and transmitted to the liquid level and pH value acquisition module of the central processing system. After the measurement is completed, the control valve set on the drain pipe is opened to discharge the high-temperature and high-concentration ammonium nitrate solution in the pH value testing pipeline into the drain collection bucket through the drain pipe connected to the drain port, thereby avoiding the pollution of the high-temperature and high-concentration ammonium nitrate solution to the environment. After the test solution is discharged, the test pipeline is rinsed with hot water to avoid the residual ammonium nitrate solution from losing temperature and crystallizing and clogging the pipeline.

[0109] In step 5, the central processing module transmits the pH value detected by the high-temperature pH meter to the central processing system. The central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion, and sends the conversion result of the detected pH value to the acid-base deviation judgment module for acid-base deviation judgment. If the pH value converted by the pH value conversion module is 5.0±0.5, it is judged that there is no safety hazard; if the pH value converted by the pH value conversion module is less than 4.5 or greater than 5.5, it is judged that the pH value deviates and needs to be adjusted, and enters step 6; if the pH value is less than 3.5 or greater than 6.5, it is judged that there is a serious safety hazard and the ammonium nitrate solution in the storage tank needs to be emptied immediately.

[0110] Step 6, the central processing system transmits the judgment result of the acid-base deviation judgment module, the pH value of the high-temperature and high-concentration ammonium nitrate solution, and the liquid level height inside the storage tank to the pH value adjustment module, and uses the pH value adjustment module to calculate the injection amount of the acidic adjustment liquid or the alkaline adjustment liquid to be injected, and adds the acidic adjustment liquid or the alkaline adjustment liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution.

[0111] Step 7, according to the injection amount determined by the pH value adjustment module, use the acidic adjustment liquid feeding component or the alkaline adjustment liquid feeding component to inject the acidic adjustment liquid or the alkaline adjustment liquid into the storage tank to adjust the pH value of the ammonium nitrate solution in the storage tank.

[0112] Step 8, after a period of time, the pH value of the ammonium nitrate solution in the storage tank is measured again. When the pH value of the ammonium nitrate solution in the storage tank is converted to a pH value diluted at room temperature and is within a preset safety range, it indicates that the pH value adjustment of the ammonium nitrate solution is completed.

[0113] Example 3

[0114] In this embodiment, the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 1 and the online monitoring and adjustment method for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 2 are used to actually apply the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution to the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the storage tank, specifically comprising the following steps:

[0115] Step 1, preheating the storage tank. In this embodiment, the diameter of the storage tank is set to 3m. The high-pressure steam coil arranged in the tank wall is used to heat the inside of the storage tank to increase the storage temperature inside the storage tank to avoid the overall or partial crystallization of the ammonium nitrate solution inside the storage tank. When the storage tank is empty, 200-300kPa high-pressure steam is continuously introduced into the high-pressure steam coil. After continuous heating for 1 hour, the high-pressure steam coil is used to heat the internal temperature of the storage tank to the preset safe storage temperature of the ammonium nitrate solution, thereby completing the preheating treatment of the storage tank before the ammonium nitrate solution is injected.

[0116] Step 2, open the ammonium nitrate solution feed pipe, and use the ammonium nitrate solution feed pipe to inject a high-temperature and high-concentration ammonium nitrate solution with a concentration of 91% and a temperature of 120°C into the storage tank, and at the same time turn on the stirring component in the storage tank body to keep the high-temperature and high-concentration ammonium nitrate solution in a flowing state at all times, thereby preventing the high-temperature and high-concentration ammonium nitrate solution from precipitating crystal particles and accumulating in the storage tank due to loss of temperature.

[0117] During the injection of the high-temperature and high-concentration ammonium nitrate solution, the liquid level in the storage tank is monitored in real time using a liquid level gauge on the inner wall of the storage tank. After the injection is completed, the ammonium nitrate solution feed pipe is closed and the monitored liquid level is 2m.

[0118] Step 3, in order to ensure the uniformity of the high-temperature and high-concentration ammonium nitrate solution in the storage tank in the vertical direction, open the solution circulation structure, and use the one-way pump provided in the solution circulation structure to extract the high-temperature and high-concentration ammonium nitrate solution from the bottom of the storage tank. After the extracted high-temperature and high-concentration ammonium nitrate solution flows through the solution circulation pipeline, it is re-injected into the storage tank from the top of the storage tank.

[0119] Step 4, every 2 hours, the high temperature and high concentration ammonium nitrate solution in the storage tank is tested for pH, and the pH value of the high temperature and high concentration ammonium nitrate solution is tested using a pH test component. During the test, the test control valve is converted from a closed state to an open state. After the high temperature and high concentration ammonium nitrate solution enters the pH test pipeline, the test control valve is closed to form a closed space in the pH test pipeline. The pH value of the high temperature and high concentration ammonium nitrate solution is measured using a high temperature pH meter in the pH test pipeline and transmitted to the liquid level and pH value acquisition module of the central processing system. In this embodiment, the pH value of the high temperature and high concentration ammonium nitrate solution measured by the high temperature pH meter is 1.92. After the measurement, the control valve provided on the drain pipe is opened, and the high temperature and high concentration ammonium nitrate solution in the pH test pipeline is discharged into the drain collection bucket through the drain pipe connected to the drain port, thereby avoiding the pollution of the high temperature and high concentration ammonium nitrate solution to the environment. After the test solution is discharged, the test pipeline is rinsed with hot water to avoid the residual ammonium nitrate solution from losing temperature and crystallizing and clogging the pipeline.

[0120] Step 5, the central processing module transmits the pH value detected by the high temperature pH meter to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion, and sends the conversion result of the detected pH value to the acid-base deviation judgment module for acid-base deviation judgment. In this embodiment, the pH value conversion formula is:

[0121] y = 8.14x- 11.51 (1)

[0122] In the formula,

[0123] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0124] y—pH value after dilution at room temperature.

[0125] After conversion, the pH value of the ammonium nitrate solution after dilution at room temperature is 4.1, which exceeds the safe range of the pH value of the ammonium nitrate solution. The acid-base deviation judgment module determines that there are safety hazards in the storage process of the ammonium nitrate solution.

[0126] Step 6, the central processing system transmits the judgment result of the acid-base deviation judgment module and the pH value of the high-temperature and high-concentration ammonium nitrate solution of 1.92 to the pH value adjustment module. Combined with the tank diameter of 3m and the liquid level height of 2m in the tank, the pH value adjustment module calculates and determines that ammonia water with a concentration of 98% needs to be injected into the tank, and the injection amount of ammonia water is 0.77kg.

[0127] Step 7, according to the injection amount determined by the pH value adjustment module, use the alkaline adjustment liquid feeding component to slowly inject the alkaline adjustment liquid into the storage tank. In this embodiment, the alkaline adjustment liquid is liquid nitrogen, which is injected into the storage tank after preheating to adjust the pH value of the ammonium nitrate solution in the storage tank. During the injection of liquid ammonia, the stirring component is turned on to continuously stir the injected liquid ammonia.

[0128] Step 8, after 10 minutes, measure the pH value of the ammonium nitrate solution in the storage tank again. In this embodiment, the pH value of the ammonium nitrate solution in the storage tank after the injection of liquid ammonia is measured to be 2.01. The corresponding pH value of normal temperature dilution after conversion is 4.8, which is within the safety range of the preset pH value of the ammonium nitrate solution, and the adjustment of the pH value of the ammonium nitrate solution is stopped.

[0129] Example 4

[0130] In this embodiment, the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 1 and the online monitoring and adjustment method for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 2 are used to actually apply the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution to the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the storage tank, specifically comprising the following steps:

[0131] Step 1, preheating the storage tank. In this embodiment, the diameter of the storage tank is set to 4m. The high-pressure steam coil arranged in the tank wall is used to heat the inside of the storage tank to increase the storage temperature inside the storage tank to avoid the overall or partial crystallization of the ammonium nitrate solution inside the storage tank. When the storage tank is empty, 200-300kPa high-pressure steam is continuously introduced into the high-pressure steam coil. After continuous heating for 1 hour, the high-pressure steam coil is used to heat the internal temperature of the storage tank to the preset safe storage temperature of the ammonium nitrate solution, thereby completing the preheating treatment of the storage tank before the ammonium nitrate solution is injected.

[0132] Step 2, open the ammonium nitrate solution feed pipe, and use the ammonium nitrate solution feed pipe to inject a high-temperature and high-concentration ammonium nitrate solution with a concentration of 90% and a temperature of 115°C into the storage tank, and at the same time turn on the stirring component in the storage tank body to keep the high-temperature and high-concentration ammonium nitrate solution in a flowing state at all times, thereby preventing the high-temperature and high-concentration ammonium nitrate solution from precipitating crystal particles and accumulating in the storage tank due to loss of temperature.

[0133] During the injection process of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height in the storage tank is monitored in real time using a liquid level gauge on the inner wall of the storage tank. After the injection is completed, the ammonium nitrate solution feed pipe is closed, and the injection of the high-temperature and high-concentration ammonium nitrate solution into the storage tank is stopped. The monitored liquid level height is 3 meters.

[0134] Step 3, in order to ensure the uniformity of the high-temperature and high-concentration ammonium nitrate solution in the storage tank in the vertical direction, open the solution circulation structure, and use the one-way pump provided in the solution circulation structure to extract the high-temperature and high-concentration ammonium nitrate solution from the bottom of the storage tank. After the extracted high-temperature and high-concentration ammonium nitrate solution flows through the solution circulation pipeline, it is re-injected into the storage tank from the top of the storage tank.

[0135] Step 4, every 2 hours, the high-temperature and high-concentration ammonium nitrate solution in the storage tank is tested for pH, and the pH value of the high-temperature and high-concentration ammonium nitrate solution is tested using a pH test component. During the test, the test control valve is converted from a closed state to an open state. After the high-temperature and high-concentration ammonium nitrate solution enters the pH test pipeline, the test control valve is closed to form a closed space in the pH test pipeline. The pH value of the high-temperature and high-concentration ammonium nitrate solution is measured using a high-temperature pH meter in the pH test pipeline and transmitted to the liquid level and pH value acquisition module of the central processing system. In this embodiment, the pH value of the high-temperature and high-concentration ammonium nitrate solution measured by the high-temperature pH meter is 2.08. After the measurement, the control valve provided on the drain pipe is opened, and the high-temperature and high-concentration ammonium nitrate solution in the pH test pipeline is discharged into the drain collection bucket through the drain pipe connected to the drain port, thereby avoiding the pollution of the high-temperature and high-concentration ammonium nitrate solution to the environment. After the test solution is discharged, the test pipeline is rinsed with hot water to avoid the residual ammonium nitrate solution from losing temperature and crystallizing and clogging the pipeline.

[0136] Step 5, the central processing module transmits the pH value detected by the high temperature pH meter to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion, and sends the conversion result of the detected pH value to the acid-base deviation judgment module for acid-base deviation judgment. In this embodiment, the pH value conversion formula is:

[0137] y = 11.11x - 17.40 (2)

[0138] In the formula,

[0139] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0140] y—pH value after dilution at room temperature.

[0141] After conversion, the pH value of the ammonium nitrate solution after dilution at room temperature is 5.7, which exceeds the safe range of the pH value of the ammonium nitrate solution. The acid-base deviation determination module determines that there are safety hazards in the storage process of the ammonium nitrate solution.

[0142] Step 6, the central processing system transmits the judgment result of the acid-base deviation judgment module and the pH value of the high-temperature and high-concentration ammonium nitrate solution of 2.08 to the pH value adjustment module. Combined with the storage tank diameter of 4m and the liquid level height of 3m in the storage tank, the pH value adjustment module calculates and determines that concentrated nitric acid with a concentration of 63% needs to be injected into the storage tank, and the injection amount of concentrated nitric acid is 3.41kg.

[0143] Step 7, according to the injection amount determined by the pH value adjustment module, the acidic adjusting liquid is slowly injected into the storage tank using the acidic adjusting liquid feeding component. In this embodiment, the acidic adjusting liquid is concentrated nitric acid, which is injected into the storage tank after preheating to adjust the pH value of the ammonium nitrate solution in the storage tank. During the injection of concentrated nitric acid, the stirring component is turned on to continuously stir the injected concentrated nitric acid.

[0144] Step 8, after 10 minutes, measure the pH value of the ammonium nitrate solution in the storage tank again. In this embodiment, the pH value of the ammonium nitrate solution in the storage tank after the injection of concentrated nitric acid is measured to be 2.02. The corresponding pH value of normal temperature dilution after conversion is 5.0, which is within the safety range of the preset pH value of the ammonium nitrate solution, and the adjustment of the pH value of the ammonium nitrate solution is stopped.

[0145] Example 5

[0146] In this embodiment, the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 1 and the online monitoring and adjustment method for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 2 are used to actually apply the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution to the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the storage tank, specifically comprising the following steps:

[0147] Step 1, preheating the storage tank. In this embodiment, the diameter of the storage tank is set to 2.5m. The high-pressure steam coil arranged in the tank wall is used to heat the inside of the storage tank to increase the storage temperature inside the storage tank to avoid the overall or partial crystallization of the ammonium nitrate solution inside the storage tank. When the storage tank is empty, 200-300kPa high-pressure steam is continuously introduced into the high-pressure steam coil. After continuous heating for 1 hour, the high-pressure steam coil is used to heat the internal temperature of the storage tank to the preset safe storage temperature of the ammonium nitrate solution, thereby completing the preheating treatment of the storage tank before the ammonium nitrate solution is injected.

[0148] Step 2, open the ammonium nitrate solution feed pipe, and use the ammonium nitrate solution feed pipe to inject a high-temperature and high-concentration ammonium nitrate solution with a concentration of 91% and a temperature of 125°C into the storage tank, and at the same time turn on the stirring component in the storage tank body to keep the high-temperature and high-concentration ammonium nitrate solution in a flowing state at all times, thereby preventing the high-temperature and high-concentration ammonium nitrate solution from precipitating crystal particles due to loss of temperature and accumulating in the storage tank.

[0149] During the injection process of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height in the storage tank is monitored in real time using a liquid level gauge on the inner wall of the storage tank. After the injection is completed, the ammonium nitrate solution feed pipe is closed, and the injection of the high-temperature and high-concentration ammonium nitrate solution into the storage tank is stopped. The monitored liquid level height is 1.5 meters.

[0150] Step 3, in order to ensure the uniformity of the high-temperature and high-concentration ammonium nitrate solution in the storage tank in the vertical direction, open the solution circulation structure, and use the one-way pump provided in the solution circulation structure to extract the high-temperature and high-concentration ammonium nitrate solution from the bottom of the storage tank. After the extracted high-temperature and high-concentration ammonium nitrate solution flows through the solution circulation pipeline, it is re-injected into the storage tank from the top of the storage tank.

[0151] Step 4, every 2 hours, the high temperature and high concentration ammonium nitrate solution in the storage tank is tested for pH, and the pH value of the high temperature and high concentration ammonium nitrate solution is tested using a pH test component. During the test, the test control valve is converted from a closed state to an open state. After the high temperature and high concentration ammonium nitrate solution enters the pH test pipeline, the test control valve is closed to form a closed space in the pH test pipeline. The pH value of the high temperature and high concentration ammonium nitrate solution is measured using a high temperature pH meter in the pH test pipeline and transmitted to the liquid level and pH value acquisition module of the central processing system. In this embodiment, the pH value of the high temperature and high concentration ammonium nitrate solution measured by the high temperature pH meter is 1.73. After the measurement, the control valve provided on the drain pipe is opened, and the high temperature and high concentration ammonium nitrate solution in the pH test pipeline is discharged into the drain collection bucket through the drain pipe connected to the drain port, thereby avoiding the pollution of the high temperature and high concentration ammonium nitrate solution to the environment. After the test solution is discharged, the test pipeline is rinsed with hot water to avoid the residual ammonium nitrate solution from losing temperature and crystallizing and clogging the pipeline.

[0152] Step 5, the central processing module transmits the pH value detected by the high temperature pH meter to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion, and sends the conversion result of the detected pH value to the acid-base deviation judgment module for acid-base deviation judgment. In this embodiment, the pH value conversion formula is:

[0153] y = 8.14x- 11.51 (1)

[0154] In the formula,

[0155] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0156] y—pH value after dilution at room temperature.

[0157] After conversion, the pH value of the ammonium nitrate solution after dilution at room temperature is 2.6, which exceeds the safe range of the pH value of the ammonium nitrate solution. The acid-base deviation determination module determines that there is a safety hazard in the storage process of the ammonium nitrate solution, which exceeds the safe range of the pH value of the ammonium nitrate solution. After the determination by the acid-base deviation determination module, emergency measures are taken to discharge all the ammonium nitrate solution in the storage tank using the ammonium nitrate solution discharge pipe arranged at the bottom of the storage tank body.

[0158] Example 6

[0159] In this embodiment, the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 1 and the online monitoring and adjustment method for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 2 are used to actually apply the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution to the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the storage tank, specifically comprising the following steps:

[0160] Step 1, preheating the storage tank. In this embodiment, the diameter of the storage tank is set to 4m. The high-pressure steam coil arranged in the tank wall is used to heat the inside of the storage tank to increase the storage temperature inside the storage tank to avoid the overall or partial crystallization of the ammonium nitrate solution inside the storage tank. When the storage tank is empty, 200-300kPa high-pressure steam is continuously introduced into the high-pressure steam coil. After continuous heating for 1 hour, the high-pressure steam coil is used to heat the internal temperature of the storage tank to the preset safe storage temperature of the ammonium nitrate solution, thereby completing the preheating treatment of the storage tank before the ammonium nitrate solution is injected.

[0161] Step 2, open the ammonium nitrate solution feed pipe, and use the ammonium nitrate solution feed pipe to inject a high-temperature and high-concentration ammonium nitrate solution with a concentration of 90% and a temperature of 115°C into the storage tank, and at the same time turn on the stirring component in the storage tank body to keep the high-temperature and high-concentration ammonium nitrate solution in a flowing state at all times, thereby preventing the high-temperature and high-concentration ammonium nitrate solution from precipitating crystal particles and accumulating in the storage tank due to loss of temperature.

[0162] During the injection process of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height in the storage tank is monitored in real time by using a liquid level gauge on the inner wall of the storage tank. After the injection is completed, the ammonium nitrate solution feed pipe is closed, and the injection of the high-temperature and high-concentration ammonium nitrate solution into the storage tank is stopped. The monitored liquid level is 2 meters.

[0163] Step 3, in order to ensure the uniformity of the high-temperature and high-concentration ammonium nitrate solution in the storage tank in the vertical direction, open the solution circulation structure, and use the one-way pump provided in the solution circulation structure to extract the high-temperature and high-concentration ammonium nitrate solution from the bottom of the storage tank. After the extracted high-temperature and high-concentration ammonium nitrate solution flows through the solution circulation pipeline, it is re-injected into the storage tank from the top of the storage tank.

[0164] Step 4, every 2 hours, the high temperature and high concentration ammonium nitrate solution in the storage tank is tested for pH, and the pH value of the high temperature and high concentration ammonium nitrate solution is tested using a pH test component. During the test, the test control valve is converted from a closed state to an open state. After the high temperature and high concentration ammonium nitrate solution enters the pH test pipeline, the test control valve is closed to form a closed space in the pH test pipeline. The pH value of the high temperature and high concentration ammonium nitrate solution is measured using a high temperature pH meter in the pH test pipeline and transmitted to the liquid level and pH value acquisition module of the central processing system. In this embodiment, the pH value of the high temperature and high concentration ammonium nitrate solution measured by the high temperature pH meter is 2.25. After the measurement, the control valve provided on the drain pipe is opened, and the high temperature and high concentration ammonium nitrate solution in the pH test pipeline is discharged into the drain collection bucket through the drain pipe connected to the drain port, thereby avoiding the pollution of the high temperature and high concentration ammonium nitrate solution to the environment. After the test solution is discharged, the test pipeline is rinsed with hot water to avoid the residual ammonium nitrate solution from losing temperature and crystallizing and clogging the pipeline.

[0165] Step 5, the central processing module transmits the pH value detected by the high temperature pH meter to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion, and sends the conversion result of the detected pH value to the acid-base deviation judgment module for acid-base deviation judgment. In this embodiment, the pH value conversion formula is:

[0166] y = 11.11x - 17.40 (2)

[0167] In the formula,

[0168] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0169] y—pH value after dilution at room temperature.

[0170] After conversion, the pH value of the ammonium nitrate solution after dilution at room temperature is 7.06, which exceeds the safe range of the pH value of the ammonium nitrate solution. The acid-base deviation determination module determines that there is a safety hazard in the storage process of the ammonium nitrate solution, which exceeds the safe range of the pH value of the ammonium nitrate solution. After the determination by the acid-base deviation determination module, emergency measures are taken to discharge all the ammonium nitrate solution in the storage tank using the ammonium nitrate solution discharge pipe arranged at the bottom of the storage tank body.

[0171] Example 7

[0172] In this embodiment, the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 1 and the online monitoring and adjustment method for the pH value of the high-temperature and high-concentration ammonium nitrate solution proposed in Example 2 are used to actually apply the online monitoring and adjustment device for the pH value of the high-temperature and high-concentration ammonium nitrate solution to the pH value of the high-temperature and high-concentration ammonium nitrate solution inside the storage tank, specifically comprising the following steps:

[0173] Step 1, preheating the storage tank. In this embodiment, the diameter of the storage tank is set to 3m. The high-pressure steam coil arranged in the tank wall is used to heat the inside of the storage tank to increase the storage temperature inside the storage tank to avoid the overall or partial crystallization of the ammonium nitrate solution inside the storage tank. When the storage tank is empty, 200-300kPa high-pressure steam is continuously introduced into the high-pressure steam coil. After continuous heating for 1 hour, the high-pressure steam coil is used to heat the internal temperature of the storage tank to the preset safe storage temperature of the ammonium nitrate solution, thereby completing the preheating treatment of the storage tank before the ammonium nitrate solution is injected.

[0174] Step 2, open the ammonium nitrate solution feed pipe, and use the ammonium nitrate solution feed pipe to inject a high-temperature and high-concentration ammonium nitrate solution with a concentration of 90% and a temperature of 120°C into the storage tank, and at the same time turn on the stirring component in the storage tank body to keep the high-temperature and high-concentration ammonium nitrate solution in a flowing state at all times, thereby preventing the high-temperature and high-concentration ammonium nitrate solution from precipitating crystal particles and accumulating in the storage tank due to loss of temperature.

[0175] During the injection process of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height in the storage tank is monitored in real time using a liquid level gauge on the inner wall of the storage tank. After the injection is completed, the ammonium nitrate solution feed pipe is closed, and the injection of the high-temperature and high-concentration ammonium nitrate solution into the storage tank is stopped. The monitored liquid level is 1 meter.

[0176] Step 3, in order to ensure the uniformity of the high-temperature and high-concentration ammonium nitrate solution in the storage tank in the vertical direction, open the solution circulation structure, and use the one-way pump provided in the solution circulation structure to extract the high-temperature and high-concentration ammonium nitrate solution from the bottom of the storage tank. After the extracted high-temperature and high-concentration ammonium nitrate solution flows through the solution circulation pipeline, it is re-injected into the storage tank from the top of the storage tank.

[0177] Step 4, every 2 hours, the high temperature and high concentration ammonium nitrate solution in the storage tank is tested for pH, and the pH value of the high temperature and high concentration ammonium nitrate solution is tested using a pH test component. During the test, the test control valve is converted from a closed state to an open state. After the high temperature and high concentration ammonium nitrate solution enters the pH test pipeline, the test control valve is closed to form a closed space in the pH test pipeline. The pH value of the high temperature and high concentration ammonium nitrate solution is measured using a high temperature pH meter in the pH test pipeline and transmitted to the liquid level and pH value acquisition module of the central processing system. In this embodiment, the pH value of the high temperature and high concentration ammonium nitrate solution measured by the high temperature pH meter is 1.89. After the measurement, the control valve provided on the drain pipe is opened, and the high temperature and high concentration ammonium nitrate solution in the pH test pipeline is discharged into the drain collection bucket through the drain pipe connected to the drain port, thereby avoiding the pollution of the high temperature and high concentration ammonium nitrate solution to the environment. After the test solution is discharged, the test pipeline is rinsed with hot water to avoid the residual ammonium nitrate solution from losing temperature and crystallizing and clogging the pipeline.

[0178] Step 5, the central processing module transmits the pH value detected by the high temperature pH meter to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion, and sends the conversion result of the detected pH value to the acid-base deviation judgment module for acid-base deviation judgment. In this embodiment, the pH value conversion formula is:

[0179] y = 8.14x- 11.51 (1)

[0180] In the formula,

[0181] x—pH value of high-temperature and high-concentration ammonium nitrate solution;

[0182] y—pH value after dilution at room temperature.

[0183] After conversion, the pH value of the ammonium nitrate solution after dilution at room temperature is 3.9, which exceeds the safe range of the pH value of the ammonium nitrate solution. The acid-base deviation determination module determines that there are safety hazards in the storage process of the ammonium nitrate solution.

[0184] Step 6, the central processing system transmits the judgment result of the acid-base deviation judgment module and the pH value of the high-temperature and high-concentration ammonium nitrate solution of 1.89 to the pH value adjustment module. Combined with the tank diameter of 3m and the liquid level height of 1m in the tank, the pH value adjustment module calculates and determines that ammonia water with a concentration of 98% needs to be injected into the tank, and the injection amount of ammonia water is 0.67kg.

[0185] Step 7, according to the injection amount determined by the pH value adjustment module, use the alkaline adjustment liquid feeding component to slowly inject the alkaline adjustment liquid into the storage tank. In this embodiment, the alkaline adjustment liquid is liquid nitrogen, which is injected into the storage tank after preheating to adjust the pH value of the ammonium nitrate solution in the storage tank. During the injection of liquid ammonia, the stirring component is turned on to continuously stir the injected liquid ammonia.

[0186] Step 8, after 10 minutes, measure the pH value of the ammonium nitrate solution in the storage tank again. In this embodiment, the pH value of the ammonium nitrate solution in the storage tank after the injection of liquid ammonia is measured to be 1.92. The corresponding pH value of normal temperature dilution after conversion is 4.1, which is outside the safe range of the preset pH value of the ammonium nitrate solution. The alkaline regulating liquid may be deteriorated. Stop adjusting the pH value of the ammonium nitrate solution and immediately report it to relevant technical personnel for processing.

[0187] It should be noted that some parts not described in the present invention can be implemented by adopting or drawing on existing technologies.

[0188] In addition, the optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, the technical scheme of the embodiments of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the present invention. In addition, it should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

Claims

1. An online monitoring and regulating device for the pH value of a high-temperature and high-concentration ammonium nitrate solution, used for detecting the pH value of a hot concentrated ammonium nitrate solution in a storage tank, characterized in that: An ammonium nitrate solution feed pipe and an acidic regulating liquid feed assembly are arranged on the top of the storage tank body, an ammonium nitrate solution discharge pipe and an alkaline regulating liquid feed assembly are arranged on the bottom of the storage tank body, and a solution circulation structure is arranged on one side of the storage tank body; The solution circulation structure includes a solution circulation pipeline, a one-way pump and a pH value testing component; The solution circulation pipeline comprises a first circulation pipe section, a second circulation pipe section and a third circulation pipe section, wherein the first circulation pipe section is connected to the lower part of the storage tank body, the third circulation pipe section is connected to the upper part of the storage tank body, and the second circulation pipe section is used to connect the first circulation pipe section and the third circulation pipe section; The one-way pump is located and installed at one end of the first circulation pipe section close to the storage tank body; The second circulation pipe section is provided with a pH value testing component for detecting the pH value of the ammonium nitrate solution.

2. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 1, characterized in that: The acidic regulating liquid feed assembly comprises an acidic regulating liquid feed pipe and an acidic regulating liquid nozzle installed at the end of the acidic regulating liquid feed pipe; the alkaline regulating liquid feed assembly comprises an alkaline regulating liquid feed pipe and an alkaline regulating liquid nozzle installed at the end of the alkaline regulating liquid feed pipe.

3. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 1, characterized in that: The first circulation pipe section of the solution circulation pipeline is horizontally inclined downward, the third circulation pipe section is horizontally inclined upward, and the second circulation pipe section is installed in a vertical direction.

4. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 1, characterized in that: The outer wall of the solution circulation pipeline and the outer wall of the pH value testing component are both wrapped with a polymer insulation layer, and the polymer insulation layer is wrapped with a stainless steel protective layer.

5. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 1, characterized in that: The pH value testing component includes a pH value testing pipeline and a high-temperature pH meter. The pH value testing pipeline is connected to the second circulation pipe section and has a closed top. A test control valve is arranged on the pH value testing pipeline. A high-temperature pH meter is arranged on the top of the pH value testing pipeline. A drain port and a flushing port are arranged on the pH value testing pipeline. The drain port is arranged at the bottom of the side wall of the pH value testing pipeline and is connected to a drain collection bucket through a drain pipe. The flushing port is arranged at the top of the side wall of the pH value testing pipeline. The flushing port is connected to a hot water pipe through a flushing pipe. A control valve is arranged on the flushing pipe to avoid the discharge of ammonium nitrate solution into the external environment and affecting the external environment during the detection process.

6. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 1, characterized in that: The side wall of the storage tank is provided with a stainless steel inner wall, a high-pressure steam coil, an organic polymer insulation layer and a stainless steel protective layer in sequence from the inside to the outside. The high-pressure steam coil is wound inside the tank wall and is made of stainless steel.

7. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 5, characterized in that: A stirring assembly is arranged in the storage tank body, and a liquid level meter and a temperature sensor are arranged on the inner wall of the storage tank body.

8. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 1, characterized in that: It also includes a control system, which includes a central processing system, a liquid level and pH value acquisition module, a pH value conversion module, an acid-base deviation determination module and a pH value adjustment module, and the liquid level and pH value acquisition module, the pH value conversion module, the acid-base deviation determination module and the pH value adjustment module are respectively connected to the central processing system; in, The liquid level and pH value acquisition module is connected to the liquid level meter and the high-temperature pH meter respectively, and is used to collect the liquid level height in the storage tank and the pH value detected by the high-temperature pH meter; the liquid level and pH value acquisition module transmits the detected liquid level height and pH value to the central processing system, and the central processing system transmits the pH value collected by the liquid level and pH value acquisition module to the pH value conversion module for conversion; The pH value conversion module is used to convert the pH value detected by the high-temperature pH meter into the corresponding pH value after dilution under normal temperature conditions; the pH value conversion module transmits the converted pH value of the ammonium nitrate solution to the central processing system for storage, and the central processing module sends the converted pH value of the ammonium nitrate solution to the acid-base deviation determination module for acid-base deviation determination; The acid-base deviation determination module is used to compare the pH value converted by the pH value conversion module with the preset value to determine whether there is a safety hazard in the storage process of the ammonium nitrate solution. If the pH value of the ammonium nitrate solution after conversion exceeds the safety range, a pH value adjuster is added; the acid-base deviation determination module feeds back the determination result to the central processing system, and the central processing system transmits the determination result of the acid-base deviation determination module, the pH value of the high-temperature and high-concentration ammonium nitrate solution, and the liquid level height inside the storage tank to the pH value adjustment module, and the pH value adjustment module controls the pH value adjustment module to add an acidic adjustment liquid or an alkaline adjustment liquid into the storage tank to adjust the pH value of the ammonium nitrate solution; The pH value adjustment module is used to determine the injection amount of the acidic adjustment liquid or the alkaline adjustment liquid according to the judgment result of the acid-base deviation judgment module and the pH value of the high-temperature and high-concentration ammonium nitrate solution using the injection amount calculation formula, and add the acidic adjustment liquid or the alkaline adjustment liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution.

9. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 8, characterized in that: The pH value conversion module is provided with a pH value conversion formula; When pH < 2.02, the pH value conversion formula is: y = 8.14x- 11.51 (1) When pH>2.02, the pH value conversion formula is: y = 11.11x - 17.40 (2) In the formula, x—pH value of high-temperature and high-concentration ammonium nitrate solution; y—pH value after dilution at room temperature.

10. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 8, characterized in that: The judgment conditions in the acid-base deviation judgment module are: If the pH value converted by the pH conversion module is 5.0±0.5, it is judged that there is no safety hazard; if the pH value converted by the pH conversion module is less than 4.5 or greater than 5.5, it is judged that the pH value deviates and needs to be adjusted; if the pH value is less than 3.5 or greater than 6.5, it is judged that there is a serious safety hazard and the ammonium nitrate solution in the storage tank needs to be immediately drained.

11. The device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 8, characterized in that: When the pH value adjustment module adds acidic adjusting liquid or alkaline adjusting liquid into the storage tank body to adjust the pH value of the ammonium nitrate solution according to the judgment result of the acid-base deviation judgment module, the injection amount of the acidic adjusting liquid or alkaline adjusting liquid injected into the storage tank body is determined in combination with the pH value of the high-temperature and high-concentration ammonium nitrate solution, the liquid level height inside the storage tank, and the concentration of the acidic adjusting liquid or the alkaline adjusting liquid.

12. An online monitoring and regulating device for pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 11, characterized in that: The calculation formula for the injection amount of the alkaline regulating solution is: In the formula, z1—the amount of alkaline regulating solution injected, in kg; D—tank diameter, in m; H—liquid level height, in m; x—pH value of high temperature and high concentration ammonium nitrate solution.

13. A device for online monitoring and regulating the pH value of a high-temperature and high-concentration ammonium nitrate solution according to claim 11, characterized in that: The calculation formula for the injection amount of the acidic regulating liquid is: In the formula, z2—injection amount of acidic regulating liquid, in kg; D—tank diameter, in m; H—liquid level height, in m; x—pH value of high temperature and high concentration ammonium nitrate solution.

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