Device for preparing ammonia water from low-concentration ammonia steam condensate
By designing an ammonia water preparation device for low-concentration ammonia steam condensate, the problem of excessive emissions of ammonia-containing tail gas in nitrophosphate fertilizer production was solved, ammonia recovery and environmentally friendly emissions were achieved, and production costs were reduced.
Patent Information
- Application Number
- CN202422780807.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-14
- Publication Date
- 2025-09-19
- Estimated Expiration
- 2034-11-14
AI Technical Summary
In the existing technology, during the production of nitrophosphate fertilizers, excessive emissions of ammonia-containing tail gas cause environmental pollution and waste of resources, and the cost of deammoniation water is high, which cannot meet environmental protection requirements.
A device for preparing ammonia water from low-concentration ammonia steam condensate is designed. The ammonia-containing tail gas is treated through condensers, separators and other equipment, condensed into ammonia water and recycled to ensure that the tail gas meets emission standards.
It realizes the recycling and utilization of ammonia, reduces production costs, ensures that tail gas emissions meet emission standards, and reduces environmental pollution and waste of resources.
Smart Images
Figure CN223351041U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of environmental engineering and chemical engineering, and particularly relates to a device for preparing ammonia water from low-concentration ammonia steam condensate. Background Art
[0002] The production process of nitrophosphate fertilizer includes the following steps: nitric acid decomposition of phosphate rock, separation of acid-insoluble matter, freezing and crystallization of the acidolysis solution, filtration and separation of calcium nitrate, ammonia neutralization of the mother liquor, concentration of the nitrophosphate fertilizer solution and absorption of ammonia and carbon dioxide, conversion of calcium nitrate, filtration and separation of calcium carbonate, and concentration of the ammonium nitrate solution. The concentration steps of the nitrophosphate fertilizer solution and the ammonium nitrate solution generate ammonia-containing process condensate. In the prior art, a deammonification stripping tower is often used to deammonify this process condensate. After treatment in the deammonification stripping tower, the process condensate generates ammonia-containing tail gas and deammonified water. The deammonified water, with a total nitrogen content of less than 10 parts per million (PPM), is qualified water and enters the circulating water system as make-up water, while the ammonia-containing tail gas is directly discharged. However, since the ammonia content in the ammonia-containing tail gas exceeds the standard, the direct discharge of the ammonia-containing tail gas does not meet environmental protection requirements and causes environmental pollution. In addition, the inability to recover ammonia in the ammonia-containing tail gas is a waste of resources, resulting in an increase in the production cost of nitrophosphate fertilizer. Utility Model Content
[0003] Aiming at the above-mentioned problems of low conversion rate of finished products, substandard wastewater discharge and cost reduction, the utility model designs a device for preparing ammonia water from low-concentration ammonia steam condensate.
[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:
[0005] A device for preparing ammonia water from low-concentration ammonia steam condensate, comprising a deamination stripping tower, a pressure indicating regulating valve, an electromagnetic three-way valve, a condenser, a separator, a liquid seal tank, a positive pressure storage tank, an ammonia water density meter, an ammonia water circulation lifting pump, a No. 3 regulating flow indicating valve, an ammonia water storage tank, a process condensate tank, a process condensate storage tank, a No. 2 regulating flow indicating valve, the air outlet of the deamination stripping tower is connected to the air inlet of the condenser through a pipeline, a pressure indicating regulating valve and an electromagnetic three-way valve are sequentially provided on the pipeline between the deamination stripping tower and the condenser, the third end of the electromagnetic three-way valve is connected to the outside world, the water inlet of the separator is connected to the water outlet of the condenser through a pipeline, the water outlet of the separator is connected to the water inlet of the liquid seal tank through a pipeline, and the water outlet of the liquid seal tank is connected to the The water inlet of the positive pressure storage tank is connected through a pipeline. The positive pressure storage tank is provided with an ammonia density meter. The pipeline between the water outlet of the positive pressure storage tank and the water inlet of the ammonia storage tank is provided with a No. 3 regulating flow indicating valve. The water outlet of the positive pressure storage tank is connected to the water inlet of the process condensate storage tank through a pipeline. An ammonia circulation lifting pump and a No. 2 regulating flow indicating valve are sequentially provided on the pipeline between the positive pressure storage tank and the process condensate storage tank. The liquid outlet of the process condensate tank is connected to the liquid replenishing port of the process condensate storage tank through a pipeline. The water outlet of the process condensate storage tank is connected to the water inlet of the deamination stripping tower through a pipeline. The water outlet of the deamination stripping tower is connected to the water inlet of the deamination water storage tank. A steam inlet is provided below the deamination stripping tower for introducing saturated steam.
[0006] Furthermore, the water outlet of the process condensate storage tank is connected to the cold end inlet of the stripping tower preheater through a pipeline, the process condensate lifting pump is arranged on the pipeline between the process condensate storage tank and the stripping tower preheater, the cold end outlet of the stripping tower preheater is connected to the water inlet of the deamination stripping tower through a pipeline, a No. 1 regulating flow indicating valve is provided on the pipeline between the cold end outlet of the stripping tower preheater and the deamination stripping tower, the water outlet of the deamination stripping tower is connected to the hot end inlet of the stripping tower preheater through a pipeline, and the hot end outlet of the stripping tower preheater is connected to the water inlet of the deamination water storage tank through a pipeline.
[0007] Furthermore, the water outlet of the positive pressure storage tank is connected to the water supply port of the liquid seal tank, and a liquid seal circulation valve is provided on the pipeline between the water outlet of the positive pressure storage tank and the water supply port of the liquid seal tank.
[0008] Furthermore, the gas outlet of the positive pressure storage tank is connected to the gas outlet of the deamination stripping tower through a pipeline.
[0009] Compared with the prior art, the utility model has the following advantages:
[0010] The utility model treats the ammonia-containing tail gas by adding a condenser, a separator, etc., condenses the ammonia in the ammonia-containing tail gas into ammonia water for recycling, effectively reducing production costs and ensuring that the treated tail gas meets environmental emission standards.
[0011] The ammonia water obtained by condensation of the utility model can be circulated and concentrated in the system to directly obtain ammonia water that meets the concentration requirements. Compared with the traditional method of preparing ammonia water by adding liquid ammonia, the preparation cost of ammonia water is saved.
[0012] The utility model produces ammonia water of a certain concentration by stripping ammonia steam condensate, cooling and condensing ammonia-containing steam, and then repeatedly circulating. While producing qualified ammonia water, the utility model realizes ultra-low emission of ammonia steam condensate of the device. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a process flow chart of the utility model;
[0014] In the figure: deamination stripping tower 1, pressure indicating regulating valve 2, electromagnetic three-way valve 3, condenser 4, separator 5, liquid seal tank 6, positive pressure storage tank 7, ammonia density meter 8, ammonia circulation lifting pump 9, No. 3 regulating flow indicating valve 10, ammonia storage tank 11, process condensate tank 12, process condensate storage tank 13, No. 2 regulating flow indicating valve 14, process condensate lifting pump 15, liquid seal circulation valve 16, deamination water storage tank 17, stripping tower preheater 18, No. 1 regulating flow indicating valve 19. DETAILED DESCRIPTION
[0015] In order to further illustrate the technical solution of the present invention, the present invention will be further described below through embodiments.
[0016] like Figure 1As shown, a device for preparing ammonia water from low-concentration ammonia steam condensate includes a deamination stripping tower 1, a pressure indicating regulating valve 2, an electromagnetic three-way valve 3, a condenser 4, a separator 5, a liquid seal tank 6, a positive pressure storage tank 7, an ammonia water density meter 8, an ammonia water circulation lifting pump 9, a No. 3 regulating flow indicating valve 10, an ammonia water storage tank 11, a process condensate tank 12, a process condensate storage tank 13, and a No. 2 regulating flow indicating valve 14. The air outlet of the deamination stripping tower 1 is connected to the air inlet of the condenser 4 through a pipeline. The pressure indicating regulating valve 2 and the electromagnetic three-way valve 3 are sequentially provided on the pipeline between the deamination stripping tower 1 and the condenser 4. The third end of the electromagnetic three-way valve 3 is connected to the outside world. The separator 5 The water inlet is connected to the water outlet of the condenser 4 through a pipeline, the water outlet of the separator 5 is connected to the water inlet of the liquid seal tank 6 through a pipeline, the water outlet of the liquid seal tank 6 is connected to the water inlet of the positive pressure storage tank 7 through a pipeline, the positive pressure storage tank 7 is provided with an ammonia density meter 8, the pipeline between the water outlet of the positive pressure storage tank 7 and the water inlet of the ammonia storage tank 11 is provided with a No. 3 regulating flow indicating valve 10, the water outlet of the positive pressure storage tank 7 is connected to the water inlet of the process condensate storage tank 13 through a pipeline, and an ammonia circulation lifting pump 9 and a No. 2 regulating flow indicating valve 14 are provided in sequence on the pipeline between the positive pressure storage tank 7 and the process condensate storage tank 13, and the liquid outlet of the process condensate tank 12 is connected through The pipeline is connected to the liquid replenishing port of the process condensate storage tank 13, and the water outlet of the process condensate storage tank 13 is connected to the water inlet of the deamination stripping tower 1 through a pipeline. The water outlet of the deamination stripping tower 1 is connected to the water inlet of the deamination water storage tank 17. A steam inlet is provided below the deamination stripping tower 1 for introducing saturated steam, and the circulating positive pressure is used to concentrate to ensure continuous and stable operation, effectively improving the efficiency and finished product conversion rate. The water outlet of the process condensate storage tank 13 is connected to the cold end inlet of the stripping tower preheater 18 through a pipeline, and the process condensate lifting pump 15 is arranged on the pipeline between the process condensate storage tank 13 and the stripping tower preheater 18, and the cold end outlet of the stripping tower preheater 18 is connected to the cold end outlet of the stripping tower preheater 18. The pipeline is connected to the water inlet of the deamination stripping tower 1. A No. 1 regulating flow indicating valve 19 is provided on the pipeline between the cold end outlet of the stripping tower preheater 18 and the deamination stripping tower 1. The water outlet of the deamination stripping tower 1 is connected to the hot end inlet of the stripping tower preheater 18 through a pipeline. The hot end outlet of the stripping tower preheater 18 is connected to the water inlet of the deamination water storage tank 17 through a pipeline. The water outlet of the positive pressure storage tank 7 is connected to the water supply port of the liquid seal tank 6. A liquid seal circulation valve 16 is provided on the pipeline between the water outlet of the positive pressure storage tank 7 and the water supply port of the liquid seal tank 6. The air outlet of the positive pressure storage tank 7 is connected to the air outlet of the deamination stripping tower 1 through a pipeline, which plays the role of a safety valve.
[0017] Process flow: such as Figure 1As shown, the process condensate stored in the process condensate storage tank 13 is lifted to the deamination stripping tower 1 by the process condensate lifting pump 15. Before going to the deamination stripping tower 1, the process condensate is heated by heat exchange with the deammonium water discharged from the deamination stripping tower 1 in the stripping tower preheater 18. The deammonium water discharged from the deamination stripping tower 1 is cooled by heat exchange in the stripping tower preheater 18 and then stored in the deammonium water storage tank 17. The ammonia tail gas discharged from the deamination stripping tower 1 enters the condenser 4. Under the dual action of the set pressure and the condenser 4, it is condensed into ammonia water. Then, the ammonia water and the gas are separated by the separator 5. Separation, the exhaust gas that meets the emission requirements after separation is directly discharged into the atmosphere, and the ammonia water enters the positive pressure storage tank 7 through the liquid seal tank 6. The ammonia water density meter 8 on the positive pressure storage tank 7 detects the ammonia water in the positive pressure storage tank 7. When the concentration of the ammonia water reaches the set standard, the ammonia water is stored in the ammonia water storage tank 11. When the concentration of the ammonia water does not reach the set standard, it enters the process condensate storage tank 13 for recycling treatment again. When the liquid seal tank 6 lacks water, the ammonia water in the positive pressure storage tank 7 can be returned to the liquid seal tank through the ammonia water circulation lifting pump 9, thereby ensuring the stability of the pressure of the entire system.
[0018] The above shows and describes the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be encompassed within the present invention.
[0019] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.
Claims
1. A device for preparing ammonia water from low-concentration ammonia vapor condensate, characterized by: The invention comprises a deamination stripping tower (1), a pressure indicating regulating valve (2), an electromagnetic three-way valve (3), a condenser (4), a separator (5), a liquid seal tank (6), a positive pressure storage tank (7), an ammonia water density meter (8), an ammonia water circulation lifting pump (9), a No. 3 regulating flow indicating valve (10), an ammonia water storage tank (11), a process condensate tank (12), a process condensate storage tank (13), a No. 2 regulating flow indicating valve (14), and the gas outlet of the deamination stripping tower (1) is connected to the pressure regulating valve (2). The air inlet of the condenser (4) is connected to the air inlet of the deamination stripping tower (1). A pressure indicating regulating valve (2) and an electromagnetic three-way valve (3) are sequentially provided on the pipeline between the deamination stripping tower (1) and the condenser (4). The third end of the electromagnetic three-way valve (3) is connected to the outside world. The water inlet of the separator (5) is connected to the water outlet of the condenser (4) through a pipeline. The water outlet of the separator (5) is connected to the water inlet of the liquid seal tank (6) through a pipeline. The water outlet of the liquid seal tank (6) is connected to the water inlet of the liquid seal tank (6). The water inlet of the positive pressure storage tank (7) is connected through a pipeline. The positive pressure storage tank (7) is provided with an ammonia density meter (8). The pipeline between the water outlet of the positive pressure storage tank (7) and the water inlet of the ammonia storage tank (11) is provided with a No. 3 regulating flow indicating valve (10). The water outlet of the positive pressure storage tank (7) is connected to the water inlet of the process condensate storage tank (13) through a pipeline. The pipeline between the positive pressure storage tank (7) and the process condensate storage tank (13) is provided with an ammonia circulation valve (11) and a flow regulating valve (10). A ring lift pump (9) and a No. 2 regulating flow indicating valve (14) are provided. The liquid outlet of the process condensate tank (12) is connected to the liquid replenishing port of the process condensate storage tank (13) through a pipeline. The water outlet of the process condensate storage tank (13) is connected to the water inlet of the deamination stripping tower (1) through a pipeline. The water outlet of the deamination stripping tower (1) is connected to the water inlet of the deamination water storage tank (17). A steam inlet is provided below the deamination stripping tower (1) for introducing saturated steam.
2. The device for preparing ammonia water from low-concentration ammonia vapor condensate according to claim 1, characterized in that: The water outlet of the process condensate storage tank (13) is connected to the cold end inlet of the stripping tower preheater (18) through a pipeline. A process condensate lifting pump (15) is provided on the pipeline between the process condensate storage tank (13) and the stripping tower preheater (18). The cold end outlet of the stripping tower preheater (18) is connected to the water inlet of the deamination stripping tower (1) through a pipeline. A No. 1 regulating flow indicating valve (19) is provided on the pipeline between the cold end outlet of the stripping tower preheater (18) and the deamination stripping tower (1). The water outlet of the deamination stripping tower (1) is connected to the hot end inlet of the stripping tower preheater (18) through a pipeline. The hot end outlet of the stripping tower preheater (18) is connected to the water inlet of the deamination water storage tank (17) through a pipeline.
3. The device for preparing ammonia water from low-concentration ammonia vapor condensate according to claim 1, characterized in that: The water outlet of the positive pressure storage tank (7) is connected to the water supply port of the liquid seal tank (6), and a liquid seal circulation valve (16) is provided on the pipeline between the water outlet of the positive pressure storage tank (7) and the water supply port of the liquid seal tank (6).
4. The device for preparing ammonia water from low-concentration ammonia vapor condensate according to claim 3, characterized in that: The gas outlet of the positive pressure storage tank (7) is connected to the gas outlet of the deamination stripping tower (1) through a pipeline.