An ammonia water production system

Abstract

The application discloses an ammonia water production system and relates to the technical field of chemical production. The ammonia water production system comprises an ammonia water preparation device, a liquid ammonia storage unit, an ultrapure water storage tank and an ammonia water storage tank. The liquid ammonia storage unit comprises a liquid ammonia feeding main pipe, an ammonia gas discharging main pipe, a liquid ammonia discharging main pipe and a plurality of liquid ammonia storage tanks. The liquid ammonia feeding inlet of the liquid ammonia storage tank is communicated with the liquid ammonia feeding main pipe through a liquid ammonia feeding branch pipe. The ammonia gas outlet of the ammonia gas discharging branch pipe of the liquid ammonia storage tank is communicated with the ammonia gas discharging main pipe through an ammonia gas discharging branch pipe. The liquid ammonia discharging inlet of the liquid ammonia storage tank is communicated with the liquid ammonia discharging main pipe through a liquid ammonia discharging branch pipe. The ultrapure water storage tank is communicated with the water inlet of the ammonia water preparation device through a water supply pipe. The ammonia water storage tank is communicated with the discharging outlet of the ammonia water preparation device. The ammonia water storage tank is used for storing ammonia water products. The ammonia gas in the liquid ammonia storage tank is injected into a transport tank so as to improve the discharging efficiency of the liquid ammonia in the transport tank, thereby improving the storage efficiency of the liquid ammonia and reducing the production cost of the ammonia water.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical production, in particular to an ammonia water production system. BACKGROUND

[0002] Ammonia water, also known as ammonia water, refers to the aqueous solution of ammonia. Ammonia water is generally used as agricultural fertilizer. In chemical industry, it is often used to produce various ammonium salts, amine reagents for organic synthesis, and catalysts for producing thermosetting phenolic resin; in textile industry, it is often used in wool, silk, and printing and dyeing industries for washing wool, oil stains on woolen cloth, and greige cloth, assisting dyeing, adjusting pH value, etc.; in addition, it is also often used in pharmaceutical industry, leather making, hot water bottle liner (silver plating liquid preparation), rubber, and oil and fat alkalization.

[0003] The preparation of ammonia water is usually obtained by gasification of liquid ammonia and reaction with pure water. The liquid ammonia needs to be heated and vaporized before the reaction, and cooling water is needed for cooling after the reaction. Both steps require a large amount of energy consumption.

[0004] Chinese patent document CN211035256U describes a high-purity ammonia water preparation equipment which adopts gasification and cooling method, and the production efficiency is relatively low, and the energy consumption is still not low; Chinese patent document CN204454614U describes a high-purity ammonia water continuous production device which adopts hot water and cold water as heat source, and the energy consumption is also relatively high, and at the same time adopts pressure reduction evaporation method, and the production efficiency is very low.

[0005] In addition, the prior art does not solve the problem of liquid ammonia residue and ammonia gas residue in the process of unloading liquid ammonia from tank car to storage tank. SUMMARY

[0006] The purpose of the present application is to provide an ammonia water production system to solve the problems existing in the prior art and reduce the production cost of ammonia water.

[0007] To achieve the above purpose, the present application provides the following scheme:

[0008] The present application provides an ammonia water production system, comprising:

[0009] an ammonia water preparation device;

[0010] A liquid ammonia storage unit, comprising a liquid ammonia feed header, an ammonia gas discharge header, a liquid ammonia discharge header, and a plurality of liquid ammonia storage tanks, the liquid ammonia feed inlets of the liquid ammonia storage tanks being in communication with the liquid ammonia feed header via liquid ammonia feed sub-headers, the ammonia gas outlets of the ammonia gas discharge sub-headers of the liquid ammonia storage tanks being in communication with the ammonia gas discharge header via ammonia gas discharge sub-headers, and the liquid ammonia discharge inlets of the liquid ammonia storage tanks being in communication with the liquid ammonia discharge header via liquid ammonia discharge sub-headers; the liquid ammonia feed header being configured to communicate with the ammonia discharge outlets of the transport tanks of a liquid ammonia tanker, the ammonia gas discharge header being configured to communicate with the ammonia gas inlets of the transport tanks, and the liquid ammonia discharge header being configured to communicate with the liquid ammonia inlets of the ammonia water generator;

[0011] A purified water storage tank, the purified water storage tank being in communication with the water inlets of the ammonia water generator via a water supply pipe, the water supply pipe being provided with a first water pump;

[0012] An ammonia water storage tank, the feed inlets of the ammonia water storage tank being in communication with the discharge outlets of the ammonia water generator, the ammonia water storage tank being configured to store the finished ammonia water product.

[0013] Preferably, a circulating cooling unit is further included, the circulating cooling unit comprising a first cooling water source, a water inlet pipe, a water return pipe, and a circulating pipeline fixedly arranged in the ammonia water generator, one end of the water inlet pipe being in communication with one end of the first cooling water source, and the other end of the water inlet pipe being in communication with one end of the circulating pipeline, one end of the water return pipe being in communication with the other end of the first cooling water source, and the other end of the water return pipe being in communication with the other end of the circulating pipeline, the water inlet pipe being provided with a circulating water pump.

[0014] Preferably, a plurality of recovered ammonia water units are further included, each of the recovered ammonia water units comprising a recovered ammonia water storage tank, the recovered ammonia water storage tank being configured to store recovered ammonia water, and the recovered ammonia water storage tank being in communication with the ammonia water generator via a recovered ammonia water supply pipe;

[0015] The recovered ammonia water supply pipe is provided with a second water pump, a shut-off valve, and a flow meter.

[0016] Preferably, a spray cooling unit is further included, the spray cooling unit comprising a second cooling water source, a cooling water header, and a plurality of spray modules, each of the spray modules corresponding to one of the liquid ammonia storage tanks, and each of the spray modules being arranged directly above the corresponding liquid ammonia storage tank; each of the spray modules comprising a plurality of spray heads, the spray heads being in communication with the cooling water header via a pipeline, and the cooling water header being in communication with the second cooling water source.

[0017] Preferably, a tail gas absorption tank is further included, the tail gas absorption tank being configured to store purified water, and the purified water in the tail gas absorption tank being configured to absorb residual ammonia gas in other tanks.

[0018] Preferably, a first electromagnetic valve is arranged on the liquid ammonia inlet manifold, a second electromagnetic valve is arranged on the ammonia gas outlet manifold, and a third electromagnetic valve is arranged on each of the liquid ammonia outlet branch pipes.

[0019] Preferably, the number of the liquid ammonia storage tanks is three.

[0020] A waste ammonia water tank is further arranged in parallel with the ultra-pure water storage tank, and the waste ammonia water tank is communicated with the water supply pipe, and the waste ammonia water tank is used for storing waste ammonia water.

[0021] Preferably, an ammonia gas compressor is arranged on the ammonia gas outlet manifold, and the ammonia gas compressor is used for pumping the ammonia gas in the liquid ammonia storage tank into the transport tank.

[0022] Preferably, a liquid ammonia delivery pump is arranged on the liquid ammonia outlet manifold, and the liquid ammonia delivery pump is used for pumping the liquid ammonia in the liquid ammonia storage tank into the ammonia water preparation device.

[0023] Preferably, a cut-off valve, a regulating valve and a flow meter are further arranged on the liquid ammonia outlet manifold.

[0024] The present application has the following technical effects relative to the prior art:

[0025] The ammonia water production system of the present application improves the discharge efficiency of the liquid ammonia in the transport tank by injecting the ammonia gas in the liquid ammonia storage tank into the transport tank, thereby improving the storage efficiency of the liquid ammonia; the residual ammonia in the transport tank is discharged into the recovery ammonia water tank, and the ultra-pure water in the recovery ammonia water tank is combined with the residual ammonia to form recovery ammonia water, and the recovery ammonia water is fully utilized by the ammonia water preparation device to produce ammonia water, thereby realizing the comprehensive recovery and reuse of the ammonia gas, greatly reducing the production cost, and effectively preventing the potential pollution of the ammonia gas to the environment. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 Fig. 1 is a structural schematic diagram of the ammonia water production system of the present application;

[0028] Fig. 1 is a structural schematic diagram of the ammonia water production system of the present application;

[0029] 1. Ammonia preparation unit; 2. Liquid ammonia storage tank; 3. Liquid ammonia feed main pipe; 4. Ammonia discharge main pipe; 5. Liquid ammonia discharge main pipe; 6. Liquid ammonia feed branch pipe; 7. Ammonia discharge branch pipe; 8. Liquid ammonia discharge branch pipe; 9. First solenoid valve; 10. Second solenoid valve; 11. Third solenoid valve; 12. Ammonia compressor; 13. Liquid ammonia transfer pump; 14. Shut-off valve; 15. Regulating valve; 16. Flow meter; 17. Ultrapure water storage tank; 18. Ammonia storage tank; 19. Inlet pipe; 20. Circulation pipeline; 21. Return water pipe; 22. Circulating water pump; 23. Recovered ammonia storage tank; 24. Recovered ammonia supply pipe; 25. Cooling water main pipe; 26. Nozzle; 27. Tail gas absorption tank; 28. Liquid ammonia tank truck; 29. ​​Transport tank. Detailed Implementation

[0030] 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.

[0031] The purpose of this invention is to provide an ammonia production system to solve the problems existing in the prior art and reduce the production cost of ammonia.

[0032] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 As shown, this embodiment provides an ammonia water production system 100, including:

[0034] Ammonia water preparation device 1;

[0035] The liquid ammonia storage unit includes a liquid ammonia inlet main pipe 3, an ammonia outlet main pipe 4, a liquid ammonia outlet main pipe 5, and several liquid ammonia storage tanks 2. The liquid ammonia inlet of the liquid ammonia storage tank 2 is connected to the liquid ammonia inlet main pipe 3 through a liquid ammonia inlet branch pipe 6. The ammonia outlet of the ammonia outlet branch pipe 7 of the liquid ammonia storage tank 2 is connected to the ammonia outlet main pipe 4 through an ammonia outlet branch pipe 7. The liquid ammonia outlet of the liquid ammonia storage tank 2 is connected to the liquid ammonia outlet main pipe 5 through a liquid ammonia outlet branch pipe 8. The liquid ammonia inlet main pipe 3 is used to connect to the ammonia unloading port of the transport tank 29 of the liquid ammonia tank truck 28. The ammonia outlet main pipe 4 is used to connect to the ammonia inlet of the transport tank 29. The liquid ammonia outlet main pipe 5 is used to connect to the liquid ammonia inlet of the ammonia water generator 1.

[0036] Ultrapure water storage tank 17 is connected to the inlet of ammonia water generator 1 via a water supply pipe, and a first water pump is installed on the water supply pipe.

[0037] The waste ammonia water tank 30 is connected in parallel with the ultra-pure water tank, and is connected with the water supply pipe. The waste ammonia water tank 30 is used to store waste ammonia water with low concentration generated in other processes. The first water pump is used to pump the ultra-pure water in the ultra-pure water tank 17 or the waste ammonia water in the waste ammonia water tank 30 into the ammonia water preparation device 1.

[0038] The ammonia water tank 18 is connected with the outlet of the ammonia water preparation device 1, and is used to store the finished ammonia water.

[0039] In the use of the ammonia water production system 100, the ammonia gas in the liquid ammonia tank 2 is injected into the transport tank 29 to improve the discharge efficiency of the liquid ammonia in the transport tank 29, thereby improving the storage efficiency of the liquid ammonia. The liquid ammonia in the liquid ammonia tank 2 and the ultra-pure water supplied by the ultra-pure water tank 17 can be directly used to produce ammonia water, and the production cost is low.

[0040] It is worth noting that the number of liquid ammonia tanks 2 in the embodiment is three, and one or two of the liquid ammonia tanks 2 are used as standby tanks. In actual application, the number of liquid ammonia tanks 2 can be adjusted as needed. The ammonia water preparation device 1 is a commercially available product known in the art, and its specific structure and working principle will not be described in detail in this embodiment.

[0041] In an optional scheme of the embodiment, a circulating cooling unit is further included, which comprises a first cooling water source, an inlet pipe 19, a return pipe 21, and a circulating pipeline 20 fixed in the ammonia water preparation device 1. One end of the inlet pipe 19 is connected with one end of the first cooling water source, and the other end is connected with one end of the circulating pipeline 20. One end of the return pipe 21 is connected with the other end of the first cooling water source, and the other end is connected with the other end of the circulating pipeline 20. A circulating water pump 22 is arranged on the inlet pipe 19. In the working process, the circulating pipeline 20 is used to cool the ammonia water preparation device 1, so that the temperature of the ammonia water preparation device 1 is kept stable.

[0042] In an optional scheme of the embodiment, a plurality of recovery ammonia water units are further included. Each recovery ammonia water unit comprises a recovery ammonia water tank 23 connected with the ammonia water preparation device 1 through a recovery ammonia water supply pipe 24. A second water pump, a shut-off valve 14, and a flow meter 16 are arranged on the recovery ammonia water supply pipe 24. The recovery ammonia water tank 23 stores recovery ammonia water, which can be used as raw material for the ammonia water preparation device 1 to prepare ammonia water. The second water pump is used to pump the recovery ammonia water in the recovery ammonia water tank 23 into the ammonia water preparation device 1. In the embodiment, the number of recovery ammonia water units is two, one of which is used normally, and the other is used as a standby.

[0043] In an optional solution of the embodiment, preferably, a spray cooling unit is further included, the spray cooling unit includes a second cooling water source, a cooling water main pipe 25 and a plurality of spray modules, each of the spray modules corresponds to one of the liquid ammonia storage tanks 2 and is arranged directly above the corresponding liquid ammonia storage tank 2; each of the spray modules includes a plurality of spray heads 26, the spray heads 26 are communicated with the cooling water main pipe 25 through pipelines, and the cooling water main pipe 25 is communicated with the second cooling water source. The spray cooling unit is used for spraying cooling water to cool the corresponding liquid ammonia storage tank 2.

[0044] In an optional solution of the embodiment, preferably, a tail gas absorption tank 27 is further included, the tail gas absorption tank 27 stores ultrapure water therein, the ultrapure water in the tail gas absorption tank 27 is used for absorbing residual ammonia gas in other tank bodies (including but not limited to the liquid ammonia storage tanks 2 and the recovered ammonia water storage tank 23), the tail gas absorption tank 27 is further communicated with the ammonia water preparation device 1 through a pipeline, a third water pump is arranged on the connecting pipeline between the tail gas absorption tank 27 and the ammonia water preparation device 1, the ultrapure water in the tail gas absorption tank 27 absorbs ammonia water generated by tail gas and can be supplied to the ammonia water preparation device 1 as raw material, and the third water pump is used for pumping the ammonia water in the tail gas absorption tank 27 into the ammonia water preparation device 1.

[0045] In an optional solution of the embodiment, preferably, a first electromagnetic valve 9 is arranged on the liquid ammonia feeding main pipe 3, a second electromagnetic valve 10 is arranged on the ammonia gas discharging main pipe 4, and a third electromagnetic valve 11 is arranged on each of the liquid ammonia discharging branch pipes 8; a valve is arranged on each of the liquid ammonia feeding branch pipes 6 and each of the ammonia gas discharging branch pipes 7; an ammonia gas compressor 12 is arranged on the ammonia gas discharging main pipe 4, the ammonia gas compressor 12 is used for pumping the ammonia gas in the liquid ammonia storage tank 2 into the transport tank 29; a liquid ammonia conveying pump 13 is arranged on the liquid ammonia discharging main pipe 5, the liquid ammonia conveying pump 13 is used for pumping the liquid ammonia in the liquid ammonia storage tank 2 into the ammonia water preparation device 1. A shut-off valve 14, a regulating valve 15 and a flow meter 16 are further arranged on the liquid ammonia discharging main pipe 5.

[0046] The specific use method of the ammonia water production system 100 of the embodiment is as follows:

[0047] Firstly, when the liquid ammonia tank truck 28 loaded with liquid ammonia arrives at the factory, the ammonia discharging port of the liquid ammonia tank truck 28 is connected with the liquid ammonia feeding main pipe 3 of the factory, and the ammonia gas port of the liquid ammonia tank truck 28 is connected with the ammonia gas discharging main pipe 4 of the factory, so that the liquid ammonia is quickly transferred to the liquid ammonia storage tank 2 of the factory by using the self-pressure of the ammonia gas, thereby realizing the rapid and efficient storage of the liquid ammonia into the liquid ammonia tank truck; this process not only improves the unloading rate of the liquid ammonia, but also reduces the ammonia gas volatilization caused by long-time exposure to the atmosphere, thereby ensuring the environmental safety.

[0048] Then, in order to maximize the recovery of ammonia gas remaining inside the tank truck, after the liquid ammonia transmission is disconnected, the ammonia discharge port of the tank truck is connected to a recovery ammonia water tank pre-filled with ultrapure water; with the help of the residual pressure inside the tank truck, the ammonia gas is guided into the recovery ammonia water tank to react with the ultrapure water to generate recovery ammonia water, effectively preventing the escape of ammonia gas; if necessary, more ultrapure water can also be injected into the tank truck to further capture any remaining ammonia gas, ensuring the complete recovery of ammonia gas.

[0049] Next, according to actual production needs, the required concentration of ammonia water is prepared by accurately calculating the amount of liquid ammonia, the amount of ultrapure water, and the amount and concentration of recovery ammonia water. This calculation process takes into account the mass and concentration of liquid ammonia, recovery ammonia water, and ultrapure water to ensure the accuracy and economy of ammonia water preparation. The final concentration of ammonia water can be calculated by the following formula:

[0050] Ammonia water concentration = (liquid ammonia mass + recovery ammonia water mass * recovery ammonia water concentration) / (liquid ammonia mass + ultrapure water mass). Wherein, the mass of ultrapure water = recovery ammonia water mass * (1 - recovery ammonia water concentration) + the mass of ultrapure water supplied by the ultrapure water storage tank;

[0051] After the calculation is completed, the quantitative recovery ammonia water, ultrapure water, and liquid ammonia will be sent to the ammonia water preparation device 1, and the final target concentration of ammonia water will be produced by accurately controlling the proportion of ingredients. In addition, in order to maintain the safety and efficiency of the production process, the temperature of each tank is continuously monitored, and if necessary, a spray cooling device is used to cool the liquid ammonia tank 2, while a circulating cooling device is used to provide cooling for the ammonia water preparation device 1 to prevent the risk of ammonia gas leakage or explosion caused by overheating.

[0052] It is worth noting that the ammonia water in the waste ammonia water tank 30 and the ammonia water in the tail gas recovery tank 27 can also be used for the preparation of ammonia water. When using the ammonia water in the waste ammonia water tank 30 or the ammonia water in the tail gas recovery tank 27 for the preparation of ammonia water, the principle is the same as the above process, only the required amount needs to be calculated, which will not be expanded in this embodiment.

[0053] In this application, specific examples are used to illustrate the principles and implementation methods of the application. The above examples are only used to help understand the method and core idea of the application; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation and application range will be changed. In summary, the content of this specification should not be understood as a limitation of the application.

Claims

1. An ammonia water production system characterized by comprising: The application relates to an ammonia water preparation device. The ammonia water preparation device comprises an ammonia water preparation unit, a liquid ammonia storage unit, an ultrapure water storage tank, an ammonia water storage tank and a plurality of recovery ammonia water units. The liquid ammonia storage unit comprises a liquid ammonia feeding main pipe, an ammonia gas discharging main pipe, a liquid ammonia discharging main pipe and a plurality of liquid ammonia storage tanks, the liquid ammonia feeding inlets of the liquid ammonia storage tanks are communicated with the liquid ammonia feeding main pipe through liquid ammonia feeding branch pipes, the ammonia gas outlets of the liquid ammonia storage tanks are communicated with the ammonia gas discharging main pipe through ammonia gas discharging branch pipes, and the liquid ammonia discharging outlets of the liquid ammonia storage tanks are communicated with the liquid ammonia discharging main pipe through liquid ammonia discharging branch pipes; the liquid ammonia feeding main pipe is used for being communicated with the ammonia discharging port of the transport tank of a liquid ammonia tank car, the ammonia gas discharging main pipe is used for being communicated with the ammonia gas inlet of the transport tank, and the liquid ammonia discharging main pipe is used for being communicated with the liquid ammonia inlet of the ammonia water preparation unit; an ammonia gas compressor is arranged on the ammonia gas discharging main pipe, the ammonia gas compressor is used for pumping the ammonia gas in the liquid ammonia storage tanks into the transport tank, and a liquid ammonia conveying pump is arranged on the liquid ammonia discharging main pipe, the liquid ammonia conveying pump is used for pumping the liquid ammonia in the liquid ammonia storage tanks into the ammonia water preparation unit. The ultrapure water storage tank is communicated with the water inlet of the ammonia water preparation unit through a water supply pipe, and a first water pump is arranged on the water supply pipe. The ammonia water storage tank is communicated with the discharging port of the ammonia water preparation unit, and is used for storing ammonia water products. The recovery ammonia water units comprise a recovery ammonia water storage tank, residual ammonia in the transport tank is discharged into the recovery ammonia water tank, the residual ammonia is combined with the ultrapure water in the recovery ammonia water tank to form recovery ammonia water, the recovery ammonia water storage tank is used for storing the recovery ammonia water, and the recovery ammonia water storage tank is communicated with the ammonia water preparation unit through a recovery ammonia water supply pipe.

2. The ammonia water production system according to claim 1, characterized by: A second water pump, a cut-off valve and a flow meter are arranged on the recovery ammonia water supply pipe.

3. The ammonia production system according to claim 1, characterized by: The ammonia water preparation device further comprises a circulating cooling unit, a spraying cooling unit, a tail gas absorption tank and a plurality of valves.

4. The ammonia production system according to claim 1, characterized by: A first cooling water source, a water inlet pipe, a water return pipe and a circulating pipeline fixed in the ammonia water preparation unit are arranged in the circulating cooling unit, one end of the water inlet pipe is communicated with one end of the first cooling water source, the other end of the water inlet pipe is communicated with one end of the circulating pipeline, one end of the water return pipe is communicated with the other end of the first cooling water source, the other end of the water return pipe is communicated with the other end of the circulating pipeline, and a circulating water pump is arranged on the water inlet pipe.

5. The ammonia production system according to claim 1, characterized by: The spraying cooling unit comprises a second cooling water source, a cooling water main pipe and a plurality of spraying modules, the spraying modules correspond to the liquid ammonia storage tanks one by one, and the spraying modules are arranged directly above the corresponding liquid ammonia storage tanks; each spraying module comprises a plurality of nozzles, the nozzles are communicated with the cooling water main pipe through pipelines, and the cooling water main pipe is communicated with the second cooling water source. The tail gas absorption tank stores ultrapure water, and the ultrapure water in the tail gas absorption tank is used for absorbing residual ammonia gas in other tanks. A first electromagnetic valve is arranged on the liquid ammonia feeding main pipe, a second electromagnetic valve is arranged on the ammonia gas discharging main pipe, and a third electromagnetic valve is arranged on each liquid ammonia discharging branch pipe; a valve is arranged on each liquid ammonia feeding branch pipe and each ammonia gas discharging branch pipe.

6. The ammonia production system according to claim 1, characterized by: The number of liquid ammonia storage tanks is three; The system further comprises a waste ammonia water tank connected in parallel with the ultrapure water storage tank, wherein the waste ammonia water tank is connected with the water supply pipe, and the waste ammonia water tank is used for storing waste ammonia water.

7. The ammonia production system according to claim 1, characterized by: The liquid ammonia discharge header is further provided with a cut-off valve, a regulating valve and a flow meter.

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