Deamination evaporation combined system
By using a combined ammonia removal and evaporation system, which combines a stripping tower and a multi-effect heating evaporator with a steam compressor, the problems of low treatment efficiency and resource waste in sodium sarcosinate wastewater have been solved, achieving efficient and energy-saving ammonia nitrogen removal and resource recovery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI SENON CO LTD
- Filing Date
- 2025-05-12
- Publication Date
- 2026-06-19
AI Technical Summary
Wastewater containing high concentrations of ammonia nitrogen and organic pollutants generated during the production of sodium sarcosinate is difficult to treat effectively, leading to environmental pollution and resource waste. Existing technologies are inefficient and costly, and cannot achieve emission standards.
The ammonia removal and evaporation combined system includes a stripping tower, a nitrogen absorption tower, and a multi-effect heating evaporator. It utilizes a steam compressor to improve thermal energy utilization and separates ammonia nitrogen through stripping and flash evaporation to achieve resource recovery and utilization.
It effectively removes ammonia nitrogen, saves energy and reduces consumption, realizes resource recovery and environmentally friendly treatment of sodium sarcosinate wastewater, reduces treatment costs and improves treatment efficiency.
Smart Images
Figure CN224377702U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater recycling, and more specifically, it relates to a combined ammonia removal and evaporation system. Background Technology
[0002] Sodium sarcosinate, an important chemical raw material, is widely used in food, pharmaceuticals, and daily chemicals. However, the production process of sodium sarcosinate generates a large amount of wastewater containing high concentrations of ammonia nitrogen and organic pollutants. If this wastewater is discharged directly without effective treatment, it will not only cause serious environmental pollution, such as eutrophication of water bodies and disruption of ecological balance, but may also lead to soil and air pollution in surrounding areas, endangering human health. Traditional wastewater treatment processes suffer from low efficiency, high costs, and inability to achieve discharge standards when dealing with such complex wastewater.
[0003] In addition to sodium sarcosinate, sodium sarcosinate wastewater also contains free ammonia nitrogen. Evaporation alone is insufficient for treating this wastewater, as it cannot effectively separate ammonia nitrogen during the treatment process. For the treatment of this specific industry wastewater, such as sodium sarcosinate wastewater, there are no widely applicable mature technologies or products yet, and the process remains in the research and development stage.
[0004] This application aims to provide a denitrification and evaporation combined system for the comprehensive treatment of sodium sarcosinate wastewater, achieving efficient nitrogen removal, energy saving and consumption reduction, and resource recycling, providing a more efficient and sustainable solution for concentrating sodium sarcosinate wastewater for various industries. Utility Model Content
[0005] This invention overcomes the shortcomings of existing sodium sarcosinate wastewater, which contains a large amount of ammonia nitrogen, making it difficult to achieve ideal treatment results. It provides a combined ammonia removal and evaporation system that can efficiently remove nitrogen, save energy and reduce consumption to achieve resource recycling, and provide a more efficient and sustainable solution for concentrating sodium sarcosinate wastewater for various industries.
[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0007] An ammonia removal and evaporation combined system includes an ammonia removal system and an evaporation system. The ammonia removal system includes a stripping tower, a nitrogen absorption tower, and an ammonia product tank. The evaporation system includes several heating evaporators and a steam compressor. At least one heating evaporator is connected to the steam compressor. The steam compressor or the heating evaporator is connected to the stripping tower. The liquid outlet of the stripping tower is connected to the heating evaporator. The gas outlet of the stripping tower is connected in series with the nitrogen absorption tower and the ammonia product tank.
[0008] The ammonia removal and evaporation combined system is a combined treatment system used to process ammonia-containing materials with recoverable components. It removes nitrogen through stripping, then concentrates the material through flash evaporation, separating the moisture to obtain a solid or near-solid material. This allows for material recovery and reuse, preventing direct discharge into the environment and meeting environmental protection requirements.
[0009] This application uses steam as the stripping medium, provided by a self-evaporating system, which fully utilizes the steam generated by the evaporation system to improve the utilization rate of water and heat resources. The stripped steam mixed with ammonia nitrogen is absorbed by a nitrogen absorption tower. By utilizing the full contact between liquid water and ammonia nitrogen, the amount of ammonia nitrogen dissolved in the water is increased, producing corresponding ammonia water. The ammonia water is stored in an ammonia product tank as a resource for reuse.
[0010] The steam fed into the stripping tower must be high-temperature steam. The high-temperature steam can be fed from the steam compressor or it can be high-temperature steam generated by the heating evaporator and heated by a dedicated deammoniation tower heater.
[0011] The evaporation system employs a multi-effect heating evaporator for repeated heating and evaporation to save energy and reduce total heat energy consumption. A steam compressor compresses the incoming steam to replenish heat energy, and the heated high-temperature steam is then used as a heat source medium in the heating evaporator to raise the temperature of the material.
[0012] Preferably, the nitrogen absorption tower is also connected to a water tank, which supplies water for ammonia absorption to the nitrogen absorption tower via a water pump. The water tank is connected to the top of the ammonia absorption tower. The water supplied by the water tank enters the nitrogen absorption tower and comes into contact with and absorbs the ammonia gas entering the tower.
[0013] Preferably, three heating evaporators are used, connected in series. The steam outlet of the steam compressor is connected to the first-effect and third-effect heating evaporators, the steam outlet of the first-effect heating evaporator is connected to the second-effect heating evaporator, and the outlets of the second-effect and third-effect heating evaporators are connected to the steam compressor. The steam compressor provides heat energy, and the steam generated by the second and third-effect heating evaporators is used as a medium. After compression to increase its calorific value, the steam is returned to the first and third-effect heating evaporators. This steam pipeline connection effectively utilizes heat and improves the efficiency of heat entropy utilization. For liquid materials with higher temperatures, relatively low-temperature secondary steam is used for heating.
[0014] Preferably, the first-effect and second-effect heating evaporators are forced falling film evaporators. The combined use of forced falling film evaporators and steam compressors is suitable for materials with high viscosity and heat sensitivity, such as sodium sarcosinate, and has the advantages of high efficiency, low energy consumption, fast evaporation rate, high heat transfer efficiency, small footprint, and large processing capacity.
[0015] As a preferred option, the third-effect heating evaporator is a forced circulation evaporator. Forced circulation evaporators offer advantages such as strong adaptability, low scaling, high full-tube heat transfer coefficient, fast flow rate, resistance to salt precipitation, continuous operation, long operating cycles, and easy cleaning. They are particularly suitable for concentrating materials with high specific gravity, high viscosity, and easy crystallization. Since the concentration of the material entering the forced circulation evaporator is already relatively high, using a third-effect heating evaporator as a forced circulation evaporator can reduce the probability of scaling.
[0016] Preferably, the outlet of the third-effect evaporator is also connected to a condenser and a vacuum pump. By extracting some of the steam through the condenser and vacuum pump, a negative pressure is created between the third and second-effect evaporators and the first-effect evaporator, guiding the liquid material from the first-effect evaporator to the second and third-effect evaporators.
[0017] Preferably, the stripping tower and nitrogen absorption tower are equipped with steam inlets located at the bottom of the towers, and liquid inlets located at the top. The gas flows upwards from the bottom and the liquid flows downwards from the top of the stripping tower and nitrogen absorption tower, increasing the contact area and contact time, thereby ensuring thorough stripping and dissolution.
[0018] Preferably, the top of the nitrogen absorption tower is also equipped with a waste gas exhaust port. In addition to separating ammonia nitrogen from liquid materials, the stripping method can also separate other impurities. These impurities undergo secondary separation in the nitrogen absorption tower, and the gaseous impurity waste gas is led out of the nitrogen absorption tower through the waste gas exhaust port for further treatment.
[0019] Preferably, the feed liquid entering the stripping tower is also connected to a regulating pipe for supplying alkali solution. The regulating pipe supplies alkali solution to the feed liquid to be separated to adjust the overall pH value, making the ammonia nitrogen in the feed liquid easier to separate by stripping.
[0020] Compared with the prior art, the beneficial effects of this utility model are:
[0021] The stripping system and the evaporation system are combined, and the steam generated by the evaporation system is used as the stripping medium to make full use of water resources and latent heat resources and improve resource utilization efficiency. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the present invention;
[0023] Figure 2 This is a schematic diagram of the stripping system of this utility model;
[0024] Figure 3 This is a schematic diagram of the evaporation system of this utility model;
[0025] In the picture:
[0026] 1. Stripping tower; 2. Nitrogen absorption tower; 3. Ammonia product tank; 4. Water tank; 5. Exhaust gas outlet; 6. First-effect evaporator; 7. Third-effect evaporator; 8. Second-effect evaporator; 9. Steam compressor; 10. Regulating pipe; 11. Condenser; 12. Vacuum pump; 13. Crystallization slurry tank. Detailed Implementation
[0027] The present disclosure will be further described below with reference to the accompanying drawings and embodiments.
[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.
[0029] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0030] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "vertical," "horizontal," "side," and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements in this disclosure, and do not specifically refer to any component or element in this disclosure, nor should they be construed as limiting this disclosure.
[0031] In this disclosure, terms such as "fixed connection," "connected," and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this disclosure based on the specific circumstances, and they should not be construed as limitations on this disclosure.
[0032] Example:
[0033] A combined deammonia-evaporation system, with reference to Figure 1As shown in the figure, the liquid flow direction is represented by solid lines and the gas flow direction is represented by dashed lines. It includes a deammoniation system and an evaporation system. The deammoniation system includes a stripping tower 1, a nitrogen absorption tower 2, and an ammonia product tank 3. The evaporation system includes several heating evaporators and a steam compressor 9. At least one heating evaporator is connected to the steam compressor 9. The steam compressor 9 or the heating evaporator is connected to the stripping tower 1. The liquid outlet of the stripping tower 1 is connected to the heating evaporator. The gas outlet of the stripping tower 1 is successively connected in series with the nitrogen absorption tower 2 and the ammonia product tank 3.
[0034] Refer to Figure 2 As shown, the nitrogen absorption tower 2 is also connected to a water tank 4. The water tank 4 supplies water for absorbing ammonia to the nitrogen absorption tower 2 through a water storage pump, and the water tank 4 is connected to the top of the ammonia absorption tower. The water provided by the water tank 4 enters the nitrogen absorption tower 2 and contacts and absorbs the ammonia entering the nitrogen absorption tower 2. The stripping tower 1 and the nitrogen absorption tower 2 are provided with steam inlets, which are located at the bottoms of the stripping tower 1 and the nitrogen absorption tower 2. The stripping tower 1 and the nitrogen absorption tower 2 are provided with liquid inlets, which are located at the tops of the stripping tower 1 and the nitrogen absorption tower 2. The gas in the stripping tower 1 and the nitrogen absorption tower 2 flows upward from the bottom, and the liquid flows downward from the top, increasing the contact area and contact time, so as to fully strip and dissolve. The top of the nitrogen absorption tower 2 is also provided with an exhaust gas outlet 5. In addition to separating ammonia nitrogen in the material liquid, the stripping method can also separate and obtain other impurities. The impurities are secondarily separated through the nitrogen absorption tower 2, and the gaseous impurity waste gas is led out of the nitrogen absorption tower 2 through the exhaust gas outlet for separate treatment. The feed liquid entering the stripping tower 1 is also connected to a regulating pipe 10 for supplying alkali liquor. The regulating pipe 10 supplies alkali liquor to the raw material liquid to be separated to adjust the overall pH value, so that the ammonia nitrogen in the liquid tends to be more easily separated by the stripping method.
[0035] Refer to Figure 3 As shown, the number of heating evaporators is three, and each heating evaporator is arranged in series. The steam outlet of the steam compressor 9 is connected to the first-effect heating evaporator 6 and the third-effect heating evaporator 7. The steam outlet of the first-effect heating evaporator 6 is connected to the second-effect heating evaporator 8. The outlets of the second-effect heating evaporator 8 and the third-effect heating evaporator 7 are connected to the steam compressor 9. Using the heat energy provided by the steam compressor 9 and using the steam generated by the second-effect and third-effect heating evaporators 7 as the medium, after compressing and boosting the calorific value, it is transported back to the first-effect and third-effect heating evaporators 7. Through the above-mentioned steam pipeline connection form, the heat can be effectively utilized and the utilization efficiency of the thermal entropy can be improved. For the material liquid with a relatively high temperature, relatively low-temperature secondary steam is used for heating.
[0036] The first-effect evaporator 6 and the second-effect evaporator 8 are forced falling film evaporators. The combined use of the forced falling film evaporator and the steam compressor 9 is suitable for materials with high viscosity and heat sensitivity, such as sodium sarcosinate, offering advantages such as high efficiency, low energy consumption, fast evaporation rate, high heat transfer efficiency, small footprint, and large processing capacity. The third-effect evaporator 7 is a forced circulation evaporator. Forced circulation evaporators have advantages such as strong adaptability, low scaling, high full-tube heat transfer coefficient, fast flow rate, resistance to salt precipitation, continuous operation, long operating cycle, and easy cleaning. They are particularly suitable for concentrating materials with high specific gravity, high viscosity, and easy crystallization. Since the concentration of the material entering the forced circulation evaporator is already relatively high, using the third-effect evaporator 7 as a forced circulation evaporator can reduce the probability of scaling. The outlet of the third-effect evaporator 7 is also connected to the condenser 11 and the vacuum pump 12. By extracting a portion of the steam through condenser 11 and vacuum pump 12, a negative pressure is created between the third-effect and second-effect / first-effect heating evaporators 6, guiding the liquid material from the first-effect to the second-effect and third-effect heating evaporators 7. The material leaving the third-effect heating evaporator 7 enters the crystallizer 13 for solid-liquid separation.
[0037] The ammonia removal and evaporation combined system is a combined treatment system used to process ammonia-containing materials with recoverable components. It removes nitrogen through stripping, then concentrates the material through flash evaporation, separating the moisture to obtain a solid or near-solid material. This allows for material recovery and reuse, preventing direct discharge into the environment and meeting environmental protection requirements.
[0038] This application uses steam as the stripping medium, provided by a self-evaporating system, which fully utilizes the steam generated by the evaporation system to improve the utilization rate of water and heat resources. The stripped steam mixed with ammonia nitrogen is absorbed by nitrogen absorption tower 2. By utilizing the full contact between liquid water and ammonia nitrogen, the amount of ammonia nitrogen dissolved in the water is increased, producing corresponding ammonia water. The ammonia water is stored in ammonia product tank 3 as a resource for reuse.
[0039] The steam fed into the stripping tower 1 must be high-temperature steam. The high-temperature steam can be fed from the steam compressor 9 or it can be high-temperature steam generated by the heating evaporator and heated by a dedicated deammoniation tower heater.
[0040] The evaporation system uses a multi-effect heating evaporator for repeated heating and evaporation to save energy and reduce total heat energy consumption. The incoming steam is compressed by the steam compressor 9 to replenish the heat energy, and the heated high-temperature steam is then sent to the heating evaporator as a heat source medium to increase the temperature of the material.
[0041] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.
Claims
1. A deaminative evaporation combined system, characterized by, It includes an ammonia removal system and an evaporation system. The ammonia removal system includes a stripping tower, a nitrogen absorption tower, and an ammonia product tank. The evaporation system includes several heating evaporators and a steam compressor. At least one heating evaporator is connected to the steam compressor. The steam compressor or heating evaporator is connected to the stripping tower. The liquid outlet of the stripping tower is connected to the heating evaporator. The gas outlet of the stripping tower is connected in series with the nitrogen absorption tower and the ammonia product tank.
2. The deaminative evaporation combined system according to claim 1, characterized in that, The nitrogen absorption tower is also connected to a water tank, which supplies water for absorbing ammonia to the nitrogen absorption tower via a water pump. The water tank is connected to the top of the ammonia absorption tower.
3. The ammonia removal and evaporation combined system according to claim 1, characterized in that, There are three heating evaporators, which are connected in series. The steam outlet of the steam compressor is connected to the first-effect heating evaporator and the third-effect heating evaporator. The steam outlet of the first-effect heating evaporator is connected to the second-effect heating evaporator. The outlets of the second-effect heating evaporator and the third-effect heating evaporator are connected to the steam compressor.
4. The deaminative evaporation combined system according to claim 3, characterized in that, The first-effect and second-effect heating evaporators are forced falling film evaporators.
5. The deaminative evaporation combined system according to claim 3, characterized in that, The third-effect heating evaporator is a forced circulation evaporator.
6. The deaminative evaporation combined system according to claim 3, characterized in that, The outlet of the third-effect evaporator is also connected to a condenser and a vacuum pump.
7. The ammonia removal and evaporation combined system according to claim 2, characterized in that, The stripping tower and nitrogen absorption tower are equipped with steam inlets located at the bottom of the stripping tower and nitrogen absorption tower, and liquid inlets located at the top of the stripping tower and nitrogen absorption tower.
8. The deaminative evaporation combined system according to claim 7, characterized in that, The top of the nitrogen absorption tower is also equipped with an exhaust port for waste gas.
9. The deaminative evaporation combined system according to any one of claims 1 to 8, characterized in that, The liquid feed entering the stripping tower is also connected to a regulating pipe for supplying alkali solution.