A raw material storage device for producing nitrate in chemical industry

Abstract

The application discloses a raw material storage device for nitrate production in the chemical industry, and belongs to the technical field of raw material storage devices, which comprises a storage tank body, relief ports are connected to the two sides of the top of the storage tank body, a breather valve is installed on the relief port, a main pipeline is connected to the air inlet and outlet of the breather valve, and an air inlet pipe is connected to the main pipeline; tail gas recovery mechanisms are symmetrically arranged on the storage tank body, the tail gas recovery mechanisms comprise recovery boxes which are fixed to the storage tank body through supporting rods, the two recovery boxes are connected to the main pipelines on the two sides respectively, a solution tank is fixed to the top wall of each recovery box, and two liquid outlet hoses are connected to the bottom of the solution tank; the raw material storage device can realize automatic spraying after waste gas accumulation reaches a standard and automatic shutdown after a reaction is completed, does not need uninterrupted spraying operation, greatly saves electric energy consumption and alkali consumption, and reduces invalid volatilization and loss of alkali.

Description

Technical Field

[0001] This invention relates to the field of raw material storage equipment technology, and specifically to a raw material storage device for the chemical production of nitrates. Background Technology

[0002] In the chemical production of nitrates, nitric acid is one of the most crucial raw materials, and its storage safety and stability directly affect the continuity and safety of nitrate production. Currently, industrially, dedicated storage tanks are commonly used for large-scale storage of nitric acid to meet the raw material supply needs of continuous production. This storage method has advantages such as large capacity, good sealing, and convenient operation, and is the mainstream raw material storage method in the nitrate production field.

[0003] However, nitric acid, as a strong oxidizing and unstable acid, will undergo a slow decomposition reaction even under normal temperature and pressure storage conditions, in a sealed state. The decomposition reaction equation is: 4HNO3 → 4NO2 + O2 + 2H2O. During the decomposition process, nitrogen dioxide gas is continuously produced, which in turn reacts with water in the storage tank to generate nitric oxide gas (NO). Due to the sealed internal space of the storage tank, as NO... 2、 As NO gas accumulates, the pressure inside the tank gradually increases. To ensure the safe operation of the storage tank and prevent accidents such as leakage, deformation, or even explosion due to excessive pressure, the storage tank is equipped with a breather valve to balance the pressure inside and outside the tank and decompose the generated NO. 2、 NO gas will then be continuously discharged into the external environment through the breathing valve.

[0004] NO 2、 NO is a toxic, harmful, and irritating gas with strong corrosive properties. Direct emission into the atmosphere not only causes severe air pollution and damages the ecological environment but also poses a significant threat to the health of operators. Furthermore, it violates national integrated emission standards for air pollutants and environmental protection requirements for chemical production. Therefore, the emission of NO from the breather valve of the storage tank is a serious concern. 2、 NO gas recovery is an essential environmental protection process in the storage of nitric acid.

[0005] Currently, the mainstream treatment method in the industry involves installing a gas collection pipe at the outlet of the storage tank's breather valve to collect the emitted NO2 and NO gases. These gases are then introduced into a dedicated spray tower where they are recovered and converted into usable products such as sodium nitrite and sodium nitrate through alkaline scrubbing and absorption, achieving resource utilization of the waste gas and compliance with emission standards. While this method can solve the emission pollution problem to some extent, it has many insurmountable drawbacks in practical application, seriously affecting the practicality, economy, and flexibility of nitric acid storage equipment.

[0006] First, the existing spray tower treatment system is a large, independently installed piece of equipment. Its bulky size and complex structure require dedicated space for installation, which undoubtedly increases the overall footprint of the nitric acid storage system. This is particularly problematic for chemical production workshops with limited space or storage scenarios requiring temporary setup, as the presence of the spray tower significantly restricts the flexibility of equipment placement. Second, because the spray tower and storage tank are separate structures, when the nitric acid storage tank needs to be moved, the spray tower, along with its associated gas collection pipes and connecting components, must be disassembled, transported, and reinstalled separately. This not only increases transportation costs and workload but also increases the risk of pipe leaks and component damage during disassembly and installation, hindering the flexible transfer and rapid deployment of the storage tank.

[0007] More importantly, the NO2 emissions from nitric acid decomposition exhibit significant fluctuations and sporadic occurrences: when stored statically at room temperature in tanks, NO2 emissions remain at trace levels and remain stable; however, when the tanks are fed or discharged, or when the ambient temperature fluctuates significantly, NO2 emissions experience brief peaks before quickly returning to trace levels. Existing spray towers, to ensure effective gas treatment, require continuous operation, continuously spraying alkaline solution regardless of exhaust concentration or volume. This operating mode results in significant waste of alkaline solution and electricity during periods of low and sporadic gas emissions, leading to substantial resource waste and significantly increasing the operating costs of nitric acid storage, which contradicts the trend of energy conservation and emission reduction in chemical production. Summary of the Invention

[0008] The purpose of this invention is to provide a raw material storage device for nitrate production in the chemical industry, and to solve the following technical problems: the current equipment used for storing raw materials (nitric acid) for nitrate production has many shortcomings, such as large space occupation, inconvenience for tank transportation, serious waste of resources, high maintenance costs, and high risk of leakage, which make it difficult to meet the actual needs of safe, environmentally friendly, energy-saving and flexible storage of nitric acid in chemical production.

[0009] The objective of this invention can be achieved through the following technical solutions:

[0010] A raw material storage device for the chemical production of nitrates includes a storage tank body. Both sides of the top of the storage tank body are connected to pressure relief ports. A breather valve is installed on the pressure relief port. The inlet and outlet of the breather valve are connected to a main pipeline. An air inlet pipe is connected to the main pipeline.

[0011] The storage tank body is symmetrically equipped with a tail gas recovery mechanism. The tail gas recovery mechanism includes a recovery box fixed to the storage tank body by a support rod. The two recovery boxes are respectively connected to the main pipes on both sides. A solution tank is fixed to the top wall of the recovery box. Two liquid outlet hoses are connected to the bottom of the solution tank, and one end of the two liquid outlet hoses extends into the recovery box. A piston baffle is movably arranged inside the recovery box. Spraying mechanisms are symmetrically arranged on the lower surface of the piston baffle. The two liquid outlet hoses are respectively connected to the two spraying mechanisms. A triggering mechanism is arranged between the piston baffle and the solution tank.

[0012] As a further aspect of the present invention, a one-way valve is installed on both the main pipe and the air inlet pipe.

[0013] As a further aspect of the present invention: a rectangular scraper is fixed on the lower surface of the piston partition, and the cross-section of the scraper is a right-angled triangle.

[0014] As a further embodiment of the present invention: the triggering mechanism includes telescopic rods symmetrically arranged on the upper surface of the piston partition, and touch switches symmetrically installed on the inner surface of the top wall of the recovery tank. The two telescopic rods are respectively located directly below the two touch switches. A magnetic pump is installed on the liquid outlet hose, and the two touch switches are electrically connected to the two magnetic pumps respectively.

[0015] As a further aspect of the present invention: the telescopic rod includes a sleeve fixed to the piston partition, a push rod is movably disposed at the top of the sleeve, and a first spring is connected between the bottom end of the push rod and the sleeve.

[0016] As a further aspect of the present invention: the top of both sides of the recycling bin is connected to a connecting pipe, and a hollow block is fixed to the top of both sides of the recycling bin. A limiting block is movably provided on one side of the hollow block. One end of the limiting block extends into the recycling bin, and a second spring is connected between the other end and the inner wall of the hollow block.

[0017] As a further aspect of the present invention: the top wall of the recycling bin is symmetrically provided with connecting holes.

[0018] As a further aspect of the present invention: the spraying mechanism includes multiple spray pipes fixed to the lower surface of the piston partition, the multiple spray pipes are interconnected by connecting pipes, multiple nozzles are evenly arranged on the lower surface of the spray pipes, and a liquid inlet block is connected to one of the spray pipes, the liquid inlet block is connected to the liquid outlet hose.

[0019] As a further aspect of the present invention: the lower surface of the recycling bin is symmetrically provided with collection grooves, a guide rod is fixed on the top wall of the recycling bin, the guide rod is slidably connected to the piston partition, and a stop block is fixed at the bottom end of the guide rod.

[0020] The beneficial effects of this invention are:

[0021] (1) The present invention integrates the waste gas recovery and treatment structure directly on the outside of the storage tank body, abandoning the traditional separate layout of the independent external spray tower. It does not require separate planning of a dedicated installation site, which greatly reduces the overall space occupied by the entire raw material storage equipment. At the same time, the integrated structure has strong integrity, and the storage tank can be moved and transported as a whole without disassembling the waste gas treatment components. The disassembly and assembly process is simple, which effectively improves the flexibility of equipment deployment and adapts to the needs of different production sites.

[0022] (2) The NO2 and NO waste gas discharged by the breathing valve of the present invention can be uniformly stored in the sealed inside the recovery box. The waste gas is enriched and gathered by gradually raising the piston baffle by the air pressure inside the box. The waste gas with scattered gas volume and large concentration fluctuation is concentrated and concentrated, effectively balancing the concentration of waste gas components, making the NO to NO2 ratio more in line with the alkaline solution absorption reaction conditions, and the gas-liquid contact reaction is more complete, greatly improving the absorption and purification efficiency of nitrogen oxides, and making it easier for the tail gas emission to meet the environmental protection emission standards.

[0023] (3) The present invention relies on the piston diaphragm movement and triggering mechanism to realize the automatic start and stop of the spraying mechanism. The spraying operation is only started when the waste gas inside the recovery box accumulates to the set pressure value. The spraying stops automatically after the pressure inside the box decreases. This completely changes the operation mode of the traditional spraying equipment that runs continuously around the clock. It can greatly reduce the consumption of alkaline reagents and the power consumption of the spraying equipment, avoid the waste of resources in the process of treating low-concentration scattered waste gas from the root, and effectively reduce the environmental protection operation cost of nitric acid raw material storage stage. Attached Figure Description

[0024] The invention will now be further described with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a three-dimensional structural diagram of the breathing valve and recovery box of the present invention;

[0027] Figure 3 This is a first-view structural diagram of the interior of the recycling bin of the present invention;

[0028] Figure 4 This is a second-view structural diagram of the interior of the recycling bin of the present invention;

[0029] Figure 5 This is a front view of the recycling bin of the present invention;

[0030] Figure 6 This is a schematic diagram of the telescopic rod of the present invention;

[0031] Figure 7This is a three-dimensional structural diagram of the connecting tube and hollow block of the present invention;

[0032] Figure 8 This is a schematic diagram of the internal structure of the hollow block of the present invention;

[0033] Figure 9 This is a schematic diagram of the spray mechanism of the present invention.

[0034] In the diagram: 1. Tank body; 2. Pressure relief port; 3. Breathing valve; 4. Support rod; 5. Recovery box; 6. Main pipeline; 7. Air inlet pipe; 8. Solution tank; 9. Connecting hole; 10. Piston baffle; 11. Scraper; 12. Liquid outlet hose; 13. Spraying mechanism; 1301. Spray pipe; 1302. Spray head; 1303. Connecting pipe; 1304. Liquid inlet block; 14. Telescopic rod; 1401. Sleeve; 1402. Top rod; 1403. First spring; 15. Touch switch; 16. Guide rod; 17. Collection tank; 18. Connecting pipe; 19. Hollow block; 20. Limiting block; 21. Second spring.

[0035] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the invention. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual size and shape of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1 to 9As shown, this invention is a raw material storage device for nitrate production in the chemical industry, including a storage tank body 1. Pressure relief ports 2 are connected to both sides of the top of the storage tank body 1. Breathing valves 3 are installed on the pressure relief ports 2. The inlet and outlet of the breathing valves 3 are connected to a main pipeline 6, and an inlet pipe 7 is connected to the main pipeline 6. A tail gas recovery mechanism is symmetrically arranged on the storage tank body 1. The tail gas recovery mechanism includes recovery boxes 5 fixed to the storage tank body 1 by support rods 4. The two recovery boxes 5 are respectively connected to the main pipelines 6 on both sides. A solution tank 8 is fixed to the top wall of the recovery box 5, and the bottom of the solution tank 8... The tank is connected to two outlet hoses 12, one end of which extends into the recovery tank 5. A piston baffle 10 is movably installed inside the recovery tank 5. Spray mechanisms 13 are symmetrically arranged on the lower surface of the piston baffle 10, and the two outlet hoses 12 are respectively connected to two spray mechanisms 13. A triggering mechanism is provided between the piston baffle 10 and the solution tank 8. Nitric acid raw material is added to the storage tank body 1 for storage. During storage, with changes in temperature and other conditions, nitric acid decomposes to produce nitrogen dioxide gas. The nitrogen dioxide gas also reacts with the water in the storage tank. The reaction generates nitric oxide gas. The mixed gas enters the recovery tank 5 through the breather valve 3 and the main pipe 6. Initially, the piston baffle 10 is located at the bottom of the recovery tank 5, and the spray mechanism 13 is not working. The mixed gas accumulates below the piston baffle 10. During this process, nitric oxide and nitrogen dioxide spontaneously mix thoroughly, forming a mixed component that is easily absorbed by the alkali solution in advance, reducing the problem of poor absorption of single nitric oxide. As the decomposition proceeds, the amount of mixed gas entering the recovery tank 5 gradually increases, and the concentration rises to match the optimal absorption ratio of the alkali solution. The air pressure inside the recovery tank 5 gradually increases, pushing the piston baffle 10 upward. When the piston baffle 10 moves close to the top of the recovery tank 5, the trigger mechanism works, spraying the alkaline solution pre-stored in the solution tank 8 through the spraying mechanism 13. The alkaline solution reacts with the mixed gas to generate sodium nitrite and sodium nitrate. The mixture of sodium nitrite and sodium nitrate can be recycled or treated harmlessly. After the mixed gas is completely reacted, the air pressure below the piston baffle 10 decreases, and the piston baffle 10 automatically descends and resets. There is no need for long-term uninterrupted spraying, saving electricity and reducing the volatilization and loss of alkaline solution.

[0038] See Figure 2 Both the main pipe 6 and the air inlet pipe 7 are equipped with one-way valves; the two one-way valves are in opposite directions. The one-way valve on the main pipe 6 allows the gas discharged from the breather valve 3 to enter the recovery box 5 through the main pipe 6, while the one-way valve on the air inlet pipe 7 allows outside air to be replenished to the storage tank body 1 through the air inlet pipe 7.

[0039] See Figure 3 and Figure 4 A rectangular scraper 11 is fixed on the lower surface of the piston partition 10, and the cross section of the scraper 11 is a right triangle. The scraper 11 can clean the inner wall of the recovery box 5 when the piston partition 10 falls rapidly, thus preventing crystallization.

[0040] See Figures 3 to 6 The triggering mechanism includes telescopic rods 14 symmetrically arranged on the upper surface of the piston partition 10, and touch switches 15 symmetrically arranged on the inner surface of the top wall of the recovery tank 5. The two telescopic rods 14 are located directly below the two touch switches 15 respectively. A magnetic pump is installed on the liquid outlet hose 12, and the two touch switches 15 are electrically connected to the two magnetic pumps respectively. The telescopic rod 14 includes a sleeve 1401 fixed on the piston partition 10. A top rod 1402 is movably arranged on the top of the sleeve 1401. A first spring 1403 is connected between the bottom end of the top rod 1402 and the sleeve 1401. When the piston partition 10 is pushed up to the top of the recovery tank 5 by air pressure, the two telescopic rods 14 will contact the two touch switches 15 respectively, thereby activating the magnetic pump and sending the alkaline solution into the spraying mechanism 13 through the liquid outlet hose 12. Then the alkaline solution is sprayed out evenly and reacts with the mixed gas.

[0041] See Figures 3 to 8 The top of both side walls of the recycling bin 5 are connected to connecting pipes 18. Hollow blocks 19 are fixed to the top of both sides of the recycling bin 5. A limiting block 20 is movably installed on one side of each hollow block 19. One end of the limiting block 20 extends into the recycling bin 5, and the other end is connected to the inner wall of the hollow block 19 by a second spring 21. To ensure sufficient alkali solution reacts with the mixed gas, initially, the limiting block 20 is embedded in the inner wall of the recycling bin 5 and does not affect the movement of the piston partition 10. When the piston partition 10 passes the connecting pipe 18, the mixed gas below the piston partition 10 enters the connecting pipe 18 through it. After the piston partition 10 passes the limiting block 20, the air pressure pushes the limiting block 20 to move, and the limiting blocks 20 on both sides extend, fixing the height of the piston partition 10. Even in the early stages of the reaction, when the gas pressure at the bottom of the piston partition 10 decreases, the piston partition 10 will not descend, ensuring that the spraying mechanism 13 has sufficient working time. As the reaction proceeds, the gas pressure at the bottom of the piston partition 10 decreases significantly or even becomes slightly negative, drawing the gas from the connecting pipe 18 and the hollow block 19 into the recovery box 5. At this point, the limiting block 20 re-embeds into the side wall of the recovery box 5, and the piston partition 10 will descend. Furthermore, due to the increased weight of the piston partition 10 and the spraying mechanism 13 during the spraying process, the friction with the limiting block 20 will increase appropriately, reducing the reset speed of the limiting block 20. This allows the mixed gas from the connecting pipe 18 and the hollow block 19 to be fully drawn into the recovery box 5, preventing the mixed gas from being discharged above the piston partition 10 after it descends.

[0042] See Figure 2 and Figure 3 The top wall of the recycling box 5 is symmetrically provided with connecting holes 9; the connecting holes 9 connect the upper part of the piston partition 10 with the outside world, balance the air pressure above the piston partition 10 at all times, and eliminate the influence of air pressure blockage on the lifting and lowering movement of the piston partition 10.

[0043] See Figure 4 and Figure 9 The spraying mechanism 13 includes multiple spray pipes 1301 fixed to the lower surface of the piston partition 10. The multiple spray pipes 1301 are interconnected by connecting pipes 1303. Multiple nozzles 1302 are evenly arranged on the lower surface of the spray pipes 1301. One of the spray pipes 1301 is connected to an inlet block 1304, which is connected to the outlet hose 12. The inlet block 1304 is a hollow structure. After the alkaline solution is discharged through the outlet hose 12, it enters the inlet block 1304 and then enters each spray pipe 1301. Finally, it is evenly sprayed out through multiple nozzles 1302. The nozzles 1302 are large-diameter anti-clogging nozzles.

[0044] See Figure 3 The lower surface of the recycling box 5 is symmetrically provided with collection tanks 17, and a guide rod 16 is fixed on the top wall of the recycling box 5. The guide rod 16 is slidably connected to the piston partition 10, and a stop is fixed at the bottom end of the guide rod 16. The mixture of sodium nitrite and sodium nitrate eventually falls into the collection tank 17, and the mixture can be cleaned periodically.

[0045] The working principle of this invention is as follows: Nitric acid, the raw material for nitrate production, is stored inside the storage tank 1. Under conditions such as normal temperature storage, temperature fluctuations, and material feeding and discharging, nitric acid will slowly decompose to produce nitrogen dioxide gas. Nitrogen dioxide will further react with water vapor inside the storage tank to generate nitric oxide. The two gases mix to form a mixed waste gas of nitrogen oxides. After the waste gas is depressurized by the breather valve 3 at the top of the storage tank, it is transported unidirectionally into the recovery tank 5 through the main pipeline 6. In the initial state, the piston baffle 10 is stopped at the initial position at the bottom of the recovery tank 5, and the magnetic pump and the spraying mechanism 13 are both in a stopped state. The mixed waste gas can be continuously accumulated and placed in the sealed cavity below the piston baffle 10, so that nitric oxide and nitrogen dioxide can be fully and spontaneously mixed to achieve the optimal reaction ratio, effectively improving the industry problem that single nitric oxide is difficult to be absorbed by alkaline solution.

[0046] As nitric acid continues to decompose, the volume and concentration of waste gas inside the recovery tank 5 increase, meeting the optimal absorption reaction conditions for the alkaline solution. At the same time, the gas pressure inside the tank continues to increase, pushing the piston partition 10 to slide smoothly upward along the guide rod 16. When the piston partition 10 rises to the top limit position of the recovery tank 5, the telescopic rod 14 on the upper surface of the piston partition 10 rises synchronously. The first spring 1403 inside the sleeve 1401, in conjunction with the top rod 1402, adaptively buffers and precisely touches the touch switch 15 on the top wall of the recovery tank 5. Through electrical linkage, the corresponding magnetic pump is started synchronously. The alkaline absorption liquid pre-stored inside the solution tank 8 enters each connected spray pipe 1301 through the liquid outlet hose 12 and the liquid inlet block 1304. Finally, it is evenly atomized and sprayed downward through the bottom large-diameter anti-clogging nozzle 1302, fully contacting the high-concentration nitrogen oxide mixed waste gas below to undergo a neutralization reaction, generating a mixed solution of sodium nitrite and sodium nitrate, which can be subsequently recycled or treated harmlessly.

[0047] As the piston partition 10 moves upward and passes the installation positions of the connecting pipe 18 and the limiting block 20, some waste gas is temporarily stored inside the connecting pipe 18 and the hollow block 19. At the same time, the air pressure inside the box pushes the limiting block 20 to extend inward against the elastic force of the second spring 21, forming a mechanical limit lock on the piston partition 10 that has moved upward to the position. Even if the air pressure inside the chamber drops slightly in the early stage of the spray reaction, the piston partition 10 will not fall back prematurely, effectively extending the spray operation time and ensuring that the alkali solution and waste gas react fully. As the spray absorption reaction continues, the waste gas below the piston partition 10 is continuously consumed, the air pressure continues to decrease and a slight negative pressure is formed, which can draw all the residual waste gas temporarily stored inside the connecting pipe 18 and the hollow block 19 into the recovery box 5 for secondary deep absorption, preventing residual waste gas from lingering and leaking out. In addition, during the spray operation, the weight of the alkali solution attached to the piston partition 10 and the spray mechanism 13 increases, which can increase the contact friction with the limiting block 20, delay the limit reset speed, and further ensure the complete purification of residual waste gas.

[0048] After the waste gas inside the recycling bin 5 has completely reacted and the negative pressure has stabilized, the second spring 21 drives the limit block 20 to automatically reset and release the limit constraint. The piston partition 10 falls quickly down along the guide rod 16 under its own weight to reset. During the descent, the scraper 11 at the bottom can scrape off the nitrate crystals, scale, and residual liquid film adhering to the inner wall of the recycling bin 5 from top to bottom, thus preventing piston jamming, cavity blockage, and other malfunctions caused by crystal accumulation. The mixed waste liquid of sodium nitrite and sodium nitrate generated by the reaction naturally settles into the collection tank 17 at the bottom of the recycling bin 5, which can be cleaned and recycled by staff regularly. At the same time, after the piston partition 10 resets, the telescopic rod 14 disengages from the point. When the touch switch 15 is activated, the magnetic pump automatically shuts off and stops, and the spraying mechanism 13 stops operating, completing a full intermittent waste gas purification cycle. The entire set of equipment abandons the traditional continuous operation mode of the spraying tower. Relying on the pure mechanical linkage logic of air pressure storage, mechanical triggering, time delay limit, and gravity reset, it achieves automatic spraying after the waste gas accumulation reaches the standard and automatic shutdown after the reaction is completed. There is no need for uninterrupted spraying operation, which greatly saves energy consumption and alkali consumption, reduces the ineffective volatilization and loss of alkali, and at the same time, the integrated structure greatly reduces the equipment footprint and facilitates the overall transportation of the storage tank. The entire process is a closed gas collection reaction, which significantly improves the waste gas treatment efficiency and equipment operation stability.

[0049] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A raw material storage device for chemical production of nitrates, comprising a storage tank body (1), wherein both sides of the top of the storage tank body (1) are connected to pressure relief ports (2), and a breather valve (3) is installed on the pressure relief port (2), characterized in that, The inlet and outlet of the breathing valve (3) are connected to the main pipe (6), and the main pipe (6) is connected to the inlet pipe (7). The storage tank body (1) is symmetrically provided with a tail gas recovery mechanism. The tail gas recovery mechanism includes a recovery box (5) fixed on the storage tank body (1) by a support rod (4). The two recovery boxes (5) are respectively connected to the main pipes (6) on both sides. A solution tank (8) is fixed on the top wall of the recovery box (5). Two liquid outlet hoses (12) are connected to the bottom of the solution tank (8), and one end of the two liquid outlet hoses (12) extends into the recovery box (5). A piston partition (10) is movably arranged inside the recovery box (5). A spray mechanism (13) is symmetrically arranged on the lower surface of the piston partition (10), and the two liquid outlet hoses (12) are respectively connected to the two spray mechanisms (13). A triggering mechanism is arranged between the piston partition (10) and the solution tank (8).

2. The raw material storage equipment for nitrate production in chemical industry according to claim 1, characterized in that, One-way valves are installed on both the main pipe (6) and the air inlet pipe (7).

3. The raw material storage equipment for nitrate production in chemical industry according to claim 1, characterized in that, A rectangular scraper (11) is fixed on the lower surface of the piston partition (10), and the cross section of the scraper (11) is a right triangle.

4. The raw material storage equipment for nitrate production in chemical industry according to claim 1, characterized in that, The triggering mechanism includes telescopic rods (14) symmetrically arranged on the upper surface of the piston partition (10), and touch switches (15) symmetrically installed on the inner surface of the top wall of the recovery box (5). The two telescopic rods (14) are located directly below the two touch switches (15). A magnetic pump is installed on the liquid outlet hose (12), and the two touch switches (15) are electrically connected to the two magnetic pumps respectively.

5. The raw material storage equipment for nitrate production in chemical industry according to claim 4, characterized in that, The telescopic rod (14) includes a sleeve (1401) fixed on the piston partition (10), a push rod (1402) is movably provided on the top of the sleeve (1401), and a first spring (1403) is connected between the bottom end of the push rod (1402) and the sleeve (1401).

6. The raw material storage equipment for nitrate production in chemical industry according to claim 1, characterized in that, The top of both sides of the recycling bin (5) is connected to a connecting pipe (18), and a hollow block (19) is fixed on the top of both sides of the recycling bin (5). A limit block (20) is movably provided on one side of the hollow block (19). One end of the limit block (20) extends into the recycling bin (5), and the other end is connected to the inner wall of the hollow block (19) by a second spring (21).

7. A raw material storage device for nitrate production in chemical industry according to claim 1, characterized in that, The recycling bin (5) has symmetrically arranged connecting holes (9) on its top wall.

8. A raw material storage device for nitrate production in chemical industry according to claim 1, characterized in that, The spraying mechanism (13) includes multiple spray pipes (1301) fixed on the lower surface of the piston partition (10). The multiple spray pipes (1301) are interconnected by connecting pipes (1303). Multiple nozzles (1302) are evenly arranged on the lower surface of the spray pipes (1301). One of the spray pipes (1301) is connected to an inlet block (1304), which is connected to the outlet hose (12).

9. A raw material storage device for nitrate production in chemical industry according to claim 1, characterized in that, The lower surface of the recycling bin (5) is symmetrically provided with collection grooves (17), and a guide rod (16) is fixed on the top wall of the recycling bin (5). The guide rod (16) is slidably connected to the piston partition (10), and a stop block is fixed at the bottom end of the guide rod (16).

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