Low-temperature membrane evaporation ammonia water purification device

Abstract

The utility model relates to the technical field of wastewater treatment, and discloses a low-temperature film evaporation ammonia water purification device which comprises an ammonia water tank, a falling film evaporator, a separation tank, a condenser, a collection tank and a preheating mechanism which are sequentially connected through pipelines, a first pump body is arranged on the pipeline, a steam inlet pipe and a steam outlet pipe are arranged on the falling-film evaporator, and a cold water inlet pipe and a cold water outlet pipe are arranged on the condenser. According to the low-temperature film evaporation ammonia water purification device, through the design of the preheating bin, the introduction temperature of ammonia water is higher, the heat exchange process with the falling-film evaporator is more effective, and the heat exchange efficiency is improved; the heat exchange efficiency can be improved, the operation time can be shortened, meanwhile, steam generated by the falling-film evaporator is used for preheating ammonia water, energy can be fully utilized, the external heating requirement can be reduced, and therefore the overall energy consumption is reduced, and the system energy efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a low-temperature membrane evaporation ammonia water purification device. Background Art

[0002] With the acceleration of industrialization, the treatment of ammonia has become a key issue in environmental protection and resource utilization. Ammonia contains a large amount of ammonia nitrogen, which poses a significant threat to the aquatic ecosystem. Therefore, the development of efficient ammonia purification and refining technologies is particularly important. Due to its high efficiency and energy-saving properties, the falling film evaporator has gradually become a typical device for ammonia treatment. The operating principle of the falling film evaporator is to utilize the thin film flow of liquid on the heat exchanger tube wall, combined with the phase change during evaporation, to separate the water from other components (such as ammonia) in the liquid.

[0003] When ammonia water is purified by a falling film evaporator, if the temperature of the ammonia water is low, the evaporation rate of the ammonia water is slow, resulting in a prolonged overall processing time, thereby affecting the purification efficiency.

[0004] Therefore, we proposed a low-temperature membrane evaporation ammonia purification device to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to solve the above-mentioned problems.

[0006] To achieve the above-mentioned object, the utility model adopts the following technical solution: comprising an ammonia water tank, a falling film evaporator, a separation tank, a condenser, a collecting tank and a preheating mechanism, wherein the ammonia water tank, the falling film evaporator, the separation tank, the condenser and the collecting tank are sequentially connected by pipelines, a first pump body is provided on the pipelines, a steam inlet pipe and a steam outlet pipe are provided on the falling film evaporator, and a cold water inlet pipe and a cold water outlet pipe are provided on the condenser;

[0007] The preheating mechanism includes a preheating tank arranged between the pump body and the falling film evaporator, a sandwich is arranged inside the side wall of the preheating tank, the steam outlet pipe is connected to one side of the sandwich, and a steam exhaust pipe is arranged on the other side of the sandwich.

[0008] Furthermore, it also includes a temperature control mechanism, which includes a temperature control bin and a temperature sensor arranged on the temperature control bin, one end of the temperature control bin is connected to the steam outlet pipe, and the other end is connected to the interlayer through a connecting pipe, a temporary storage bin is provided on the cold water inlet pipe, the temperature control bin is connected to the steam inlet pipe through a heating pipe, and the temperature control bin is connected to the top of the temporary storage bin through a cooling pipe.

[0009] Furthermore, a second pump body is provided on the connecting pipe.

[0010] Furthermore, both the heating pipe and the cooling pipe are provided with electric proportional valves.

[0011] Furthermore, the connection point between the connecting pipe and the interlayer is lower than the connection point between the exhaust pipe and the interlayer.

[0012] Furthermore, a filter is provided between the ammonia water and the first pump body.

[0013] Beneficial effects of the utility model:

[0014] 1. The design of the preheating chamber allows for a higher ammonia inlet temperature, making the heat exchange process with the falling film evaporator more effective, improving heat exchange efficiency and reducing operation time. Furthermore, the use of steam generated by the falling film evaporator to preheat ammonia fully utilizes energy, reduces external heating requirements, and thus reduces overall energy consumption and improves system energy efficiency.

[0015] 2. The temperature control mechanism can flexibly adjust the preheating temperature. When the temperature of the steam exhaust pipe is low, the preheating temperature is increased by introducing high-temperature steam. When the temperature is high, the cold air in the temporary storage bin can be used to cool the preheating bin, ensuring that the ammonia water is always maintained at the optimal preheating temperature and improving the effectiveness of heat exchange. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the preheating bin of the present utility model.

[0018] The names corresponding to the marks in the figure are:

[0019] 1. Ammonia water tank; 2. Falling film evaporator; 3. Separation tank; 4. Condenser; 5. Collection tank; 6. First pump body; 7. Preheating tank; Interlayer 71; 8. Steam inlet pipe; 9. Steam outlet pipe; 10. Exhaust pipe; 11. Cold water inlet pipe; 12. Cold water outlet pipe; 13. Temporary storage bin; 14. Temperature control bin; 15. Connecting pipe; 16. Heating pipe; 17. Cooling pipe; 18. Second pump body; 19. Temperature sensor; 20. Electric proportional valve; 21. Filter. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0021] Embodiments of the present utility model:

[0022] Example 1

[0023] Such as 1 and Figure 2 As shown, the utility model provides a low-temperature film evaporation ammonia purification device, comprising an ammonia tank 1, a falling film evaporator 2, a separation tank 3, a condenser 4, a collection tank 5 and a preheating mechanism. The ammonia tank 1, the falling film evaporator 2, the separation tank 3, the condenser 4 and the collection tank 5 are sequentially connected by pipelines, a first pump body 6 is provided on the pipelines, the falling film evaporator 2 is provided with a steam inlet pipe 8 and a steam outlet pipe 9, and the condenser 4 is provided with a cold water inlet pipe 11 and a cold water outlet pipe 12;

[0024] The preheating mechanism includes a preheating tank 7 arranged between the pump body 6 and the falling film evaporator 2. An interlayer 71 is provided inside the side wall of the preheating tank 7. The steam outlet pipe 9 is connected to one side of the interlayer 71. An exhaust pipe 10 is provided on the other side of the interlayer 71.

[0025] Driven by the first pump body 6, ammonia water flows from the ammonia water tank 1 into the preheating tank 7 and the falling film evaporator 2 in sequence. In the falling film evaporator 2, the steam inlet pipe 8 enters relatively high temperature steam (preferably 60°C-90°C, to effectively promote the evaporation of ammonia water while minimizing the risk of damage to temperature-sensitive components). The ammonia water is evaporated by the falling film evaporator 2, and the evaporated gas (i.e., ammonia gas) will escape from the upper end or side end of the heating tube together with water vapor as secondary steam. Since the temperature is lower than the boiling point of water, the proportion of water vapor is small. The evaporated gas enters the condenser 4 from the separation tank 3 for condensation, and is collected by the collection tank 5 after forming ammonia liquid; before the ammonia water enters the falling film evaporator 2, it first enters the preheating tank 7 for preheating. The preheating tank is heated by the waste heat after heat exchange in the falling film evaporator 2. The waste heat is passed into the interlayer 71 to preheat the ammonia water in the preheating tank 7 and is then discharged from the exhaust pipe 10.

[0026] Example 2

[0027] like Figure 1 As shown, on the basis of the first embodiment of the present invention: a temperature control mechanism is additionally provided, the temperature control mechanism includes a temperature control bin 14 and a temperature sensor 19 arranged on the temperature control bin 14, one end of the temperature control bin 14 is connected to the steam outlet pipe 9, and the other end is connected to the interlayer 71 through a connecting pipe 15, a second pump body 18 is provided on the connecting pipe 15, a temporary storage bin 13 is provided on the cold water inlet pipe 11, the temperature control bin 14 is connected to the steam inlet pipe 8 through a heating pipe 16, the temperature control bin 14 is connected to the top of the temporary storage bin 13 through a cooling pipe 17, an electric proportional valve 20 is provided on both the heating pipe 16 and the cooling pipe 17, and the temperature sensor 19 and the electric proportional valve 20 can be connected to an external controller (such as a PLC controller, etc.). This connection method is a prior art and will not be described here.

[0028] When the waste heat from the steam outlet pipe 9 enters the temperature adjustment bin 14 for temperature adjustment before entering the preheating tank 7 to ensure that it is at the optimal preheating temperature, the temperature sensor 19 detects the waste heat temperature in the bin. When the waste heat temperature is too high, the electric proportional valve 20 on the cooling pipe 17 is opened to let in cold air to cool the waste heat; when the waste heat temperature is too low, the electric proportional valve 20 on the heating pipe 16 is opened to let in hot air to heat the waste heat.

[0029] As a preferred solution, the connection point between the connecting pipe 15 and the interlayer 71 is lower than the connection point between the exhaust pipe 10 and the interlayer 71. Since the steam floats upward, the steam coverage area is increased and the contact range is more uniform.

[0030] As a preferred solution, a filter 21 is provided between the ammonia water tank 1 and the first pump body 6. The filter 21 is a mesh filter or a membrane filter to intercept solid impurities in the ammonia water.

Claims

1. A low-temperature membrane evaporation ammonia purification device, characterized by: The invention comprises an ammonia water tank (1), a falling film evaporator (2), a separation tank (3), a condenser (4), a collecting tank (5) and a preheating mechanism. The ammonia water tank (1), the falling film evaporator (2), the separation tank (3), the condenser (4) and the collecting tank (5) are sequentially connected through pipelines. A first pump body (6) is provided on the pipeline. A steam inlet pipe (8) and a steam outlet pipe (9) are provided on the falling film evaporator (2). A cold water inlet pipe (11) and a cold water outlet pipe (12) are provided on the condenser (4). The preheating mechanism comprises a preheating tank (7) arranged between a first pump body (6) and a falling film evaporator (2); an interlayer (71) is provided inside a side wall of the preheating tank (7); the steam outlet pipe (9) is connected to one side of the interlayer (71); and a steam exhaust pipe (10) is provided on the other side of the interlayer (71).

2. The low-temperature membrane evaporation ammonia purification device according to claim 1, characterized in that: The invention also includes a temperature regulating mechanism, which includes a temperature regulating chamber (14) and a temperature sensor (19) arranged on the temperature regulating chamber (14). One end of the temperature regulating chamber (14) is connected to the steam outlet pipe (9), and the other end is connected to the interlayer (71) through a connecting pipe (15). A temporary storage chamber (13) is provided on the cold water inlet pipe (11). The temperature regulating chamber (14) is connected to the steam inlet pipe (8) through a heating pipe (16), and the temperature regulating chamber (14) is connected to the top of the temporary storage chamber (13) through a cooling pipe (17).

3. The low-temperature membrane evaporation ammonia purification device according to claim 2, characterized in that: A second pump body (18) is provided on the connecting pipe (15).

4. The low-temperature membrane evaporation ammonia purification device according to claim 2, characterized in that: The heating pipe (16) and the cooling pipe (17) are both provided with an electric proportional valve (20).

5. The low-temperature membrane evaporation ammonia purification device according to claim 2, characterized in that: The connection point between the connecting pipe (15) and the interlayer (71) is lower than the connection point between the exhaust pipe (10) and the interlayer (71).

6. The low-temperature membrane evaporation ammonia purification device according to claim 1, characterized in that: A filter (21) is provided between the ammonia water tank (1) and the first pump body (6).

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