Ammonia nitrogen recovery device for treating evaporation condensate water in adsorption mode
By designing an ammonia nitrogen recovery device for treating evaporated condensate water, using selective adsorption materials and desorption liquid separation system, the problems of high energy consumption and unstable water-producing ammonia nitrogen concentration in the prior art are solved, and the high-efficiency and low-energy-consuming ammonia nitrogen recovery effect is achieved.
Patent Information
- Application Number
- CN202421171748.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-05-27
AI Technical Summary
The existing ammonia nitrogen recovery technology has problems such as high energy consumption, unstable concentration of water-producing ammonia nitrogen, and large limitations in the use of by-products, making it difficult to effectively recover ammonia nitrogen in the evaporated condensate in the fertilizer industry.
An ammonia nitrogen recovery device for adsorption treatment of evaporated condensate water is designed. It adopts a structure connected to the adsorption tank and the water production tank. It uses a selective adsorption material to adsorb ammonia nitrogen, and reflow or recycling it according to the ammonia nitrogen concentration through a desorption liquid separation system to reduce the energy consumption of the evaporation system.
It has achieved efficient recycling of evaporative condensate with ammonia nitrogen concentration <500mg/L in the fertilizer industry, with a water production rate of up to 97%, a water production ammonia nitrogen concentration of up to <10mg/L, and a desorption liquid ammonia nitrogen recovery rate of up to 94%. The system has low energy consumption and low operating costs, and the device can be produced in a modular manner to achieve unattended operation.
Smart Images
Figure CN222665477U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ammonia nitrogen recovery, in particular to an ammonia nitrogen recovery device for treating evaporated condensed water by adsorption. Background Art
[0002] Common ammonia nitrogen recovery technologies include membrane concentration, gaseous membrane separation and recovery of ammonia nitrogen, ammonia evaporation, and struvite method.
[0003] Membrane concentration method: The membranes commonly used in the ammonia nitrogen wastewater concentration and recovery process are nanofiltration membrane, reverse osmosis membrane and DTRO membrane. These membrane processes use the pressure on both sides of the membrane as the driving force. When the ammonia nitrogen wastewater flows through the membrane surface, the clean water can pass smoothly, while the ammonia nitrogen is intercepted, realizing the separation of water and ammonia nitrogen. However, to concentrate the low-concentration ammonia nitrogen wastewater to a high-concentration ammonia nitrogen wastewater suitable for evaporation, it is necessary to go through multiple stages of concentration, which consumes a lot of energy. Affected by the inlet water temperature, the ammonia nitrogen concentration of the produced water is unstable.
[0004] Gas membrane separation method: using a hydrophobic microporous membrane with excellent performance, with the vapor pressure difference of the permeable component (ammonia) as the driving force, to remove, recover and enrich the volatile ammonia in the ammonia nitrogen wastewater. This method consumes a certain amount of sodium hydroxide, and the recovered product is ammonium sulfate, and the by-product ammonium salt has great limitations in use.
[0005] Ammonia evaporation method: Ammonia evaporation method is suitable for wastewater with high concentration of ammonia nitrogen. Its basic principle is to heat ammonia water to evaporate, and then condense it into a mixture of ammonia gas and water by cooling to achieve ammonia separation. This method is suitable for large-scale production and can prepare high-purity ammonia water, but it requires high technical level and advanced equipment, and the cost is relatively high.
[0006] Struvite method: This method is a high-concentration ammonia nitrogen wastewater treatment method that has emerged in recent years. It is seldom used in China. This method mainly uses phosphates and magnesium salts to react with ammonia nitrogen for co-precipitation, and recycles struvite as a slow-release fertilizer to compensate for part of the wastewater treatment costs, greatly reducing the overall cost of wastewater treatment. However, the cost of using phosphates and magnesium salts is relatively high, and it will cause secondary phosphorus pollution in the reaction liquid.
[0007] To this end, the inventor has conducted useful explorations and attempts and found a solution to the above-mentioned problem. The solution to be introduced below is produced under this background. Utility Model Content
[0008] The technical problem to be solved by the utility model is to provide an ammonia nitrogen recovery device for treating evaporated condensed water by adsorption in view of the deficiencies and defects of the prior art.
[0009] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:
[0010] An ammonia nitrogen recovery device for treating evaporated condensed water by adsorption, characterized in that it comprises a raw water tank (1), a raw water pump (2), an adsorption tank (4), and a water production tank (5);
[0011] The raw water tank (1) is used to store evaporated condensed water raw water, and the raw water tank (1) is connected to the adsorption tank (4) via the raw water pump (2);
[0012] The adsorption tank (4) is connected to the water production tank (5), and the water production tank (5) is used to store water produced after ammonia nitrogen is desorbed. The produced water can be used for salt preparation and desorption and flushing of the adsorption tank (4), and excess produced water can be reused for production.
[0013] In a preferred embodiment of the utility model, it also includes a pH adjustment system, which includes a pipeline mixing valve (3), an online pH meter (6), an acid dosing pump (7), and an acid storage tank (8);
[0014] The pipeline mixing valve (3) is connected to the pipeline between the raw water pump (2) and the adsorption tank (4), and is connected to the acid dosing pump (7) and the acid storage tank (8) in sequence through the pipeline mixing valve (3). The acid dosing pump (7) controls the acid dosage through the online pH meter (6).
[0015] In a preferred embodiment of the utility model, it also includes a desorption salt preparation tank (9), a flushing pump (10), a desorption pump (11) and a desorption liquid separation system;
[0016] The desorption salt preparation tank (9) is connected to the adsorption tank (4) via a desorption pump (11), and the liquid discharged during the desorption process enters the desorption liquid separation system; the water production tank (5) is connected to the adsorption tank (4) via a flushing pump (10); and the adsorption tank (4) is saturated with desorption flushing water using a device to produce water.
[0017] In a preferred embodiment of the utility model, the desorption liquid separation system includes an electromagnetic flowmeter (12), a reflux desorption liquid electric valve (13), an ammonia nitrogen recovery liquid electric valve (14), and an ammonia nitrogen recovery desorption liquid storage tank (15);
[0018] The ammonia nitrogen recovery desorption liquid storage tank (15) is connected to the adsorption tank (4) via an electromagnetic flowmeter (12). The concentrated liquid and flushing water discharged during the desorption process of the saturated adsorption material are fed back through the electromagnetic flowmeter (12) to control the opening and closing of the reflux desorption liquid electric valve (13) and the ammonia nitrogen recovery liquid electric valve (14). When the ammonia nitrogen concentration of the desorption liquid is low, the reflux desorption liquid electric valve (13) is opened, and the ammonia nitrogen recovery liquid electric valve (14) is closed at the same time, and the low ammonia nitrogen concentration desorption liquid is refluxed to the raw water tank (1) through the pipeline. When the ammonia nitrogen concentration of the desorption liquid is very high, the reflux desorption liquid electric valve (13) is closed, and the ammonia nitrogen recovery liquid electric valve (14) is opened at the same time, and the high ammonia nitrogen concentration desorption liquid is discharged to the ammonia nitrogen recovery desorption liquid storage tank (15) through the pipeline.
[0019] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:
[0020] One of the advantages of this utility model is that it is suitable for the recovery of ammonia nitrogen from evaporation condensed water with ammonia nitrogen concentration <500mg / L in the fertilizer industry. The device does not introduce new ions, and the evaporation condensed water does not need to be cooled. The treatment effect is good, the water production rate can reach 97%, the pH value of the produced water is 6-9, and the ammonia nitrogen concentration of the produced water is stable <10mg / L; the high-concentration ammonia nitrogen desorption liquid returns to the evaporation system to evaporate and recover ammonia nitrogen, and the ammonia nitrogen recovery rate of the desorption liquid can reach 94%. This utility model occupies a small area, the system is safe to use, low in energy consumption, good in water saving, and low in operating costs. The adsorption material desorption agent uses industrial salt, and the water used during the operation of the device is all produced by the device itself. This device can be produced in a modular manner, with a high degree of integration and automation, stable product quality, and unmanned operation.
[0021] The second advantage of the utility model is that the working principle of the adsorption material used is similar to the ion exchange principle. The adsorption material is an ammonia nitrogen selective adsorption material. The material has a large working adsorption exchange capacity. After adsorption saturation, 15%-18% salt solution is used for desorption. Compared with traditional hydrogen cation exchange resins, it has the advantages of neutral effluent pH, salt instead of acid for desorption, higher operation safety, low equipment corrosion requirements, low desorption water consumption, and low operating costs.
[0022] The third advantage of the utility model is that it innovatively introduces a desorption liquid separation system. According to the ammonia nitrogen concentration change curve in the desorption liquid during the desorption process of the saturated adsorption material, an electromagnetic flow meter is used to control the valve switching. The low ammonia nitrogen concentration desorption liquid returns to the original water pool for further treatment, and the high ammonia nitrogen concentration desorption liquid returns to the evaporation system to recover ammonia nitrogen, which greatly reduces the energy consumption of the evaporation system. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0024] Figure 1 The utility model is a schematic structural diagram of an embodiment.
[0025] In the figure: 1. Raw water tank; 2. Raw water pump; 3. Pipeline mixing valve; 4. Adsorption tank; 5. Water production tank; 6. Online pH meter; 7. Acid dosing pump; 8. Acid storage tank; 9. Desorption salt preparation tank; 10. Flushing pump; 11. Desorption pump; 12. Electromagnetic flowmeter; 13. Reflux desorption liquid electric valve; 14. Ammonia nitrogen recovery liquid electric valve; 15. Ammonia nitrogen recovery desorption liquid storage tank. DETAILED DESCRIPTION
[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0027] The terms such as "upper", "lower", "left", "right", "middle", etc. used in this description are only for the convenience of description and are not intended to limit the scope of application of the present invention. Changes or adjustments in their relative relationships shall be deemed to be within the scope of application of the present invention without substantially changing the technical content.
[0028] Water inlet requirements for this utility model device:
[0029] 1. The raw water containing ammonia nitrogen is evaporation condensation water, and the raw water has no obvious suspended solids.
[0030] 2. The raw water temperature is lower than 120℃, the ammonia nitrogen concentration is controlled within 500mg / L, and the maximum ammonia nitrogen concentration shall not exceed 800mg / L.
[0031] 3. The content of substances such as iron ions and strong oxidants in raw water is strictly controlled to prevent damage to the functional groups of the adsorbent.
[0032] 4. The filling height of adsorption material in the adsorption tank shall not exceed 3000mm.
[0033] like Figure 1 As shown, a specific embodiment of the utility model provides an ammonia nitrogen recovery device for treating evaporative condensed water by adsorption, comprising a raw water tank 1, a raw water pump 2, an adsorption tank 4, and a produced water tank 5; the raw water tank 1 is used to store raw water of evaporative condensed water, and the raw water tank 1 is connected to the adsorption tank 4 through the raw water pump 2; the adsorption tank of the utility model embodiment has an adsorption material that is an ammonia nitrogen adsorbing resin, the adsorption tank 4 is connected to the produced water tank 5, the produced water tank 5 is used to store produced water after ammonia nitrogen desorption, the produced water can be used for salt preparation and desorption and flushing of the adsorption tank 4, and the excess produced water can be reused for production.
[0034] The device is provided with a desorption liquid separation system, which includes an electromagnetic flowmeter 12 , a reflux desorption liquid electric valve 13 , an ammonia nitrogen recovery liquid electric valve 14 , and an ammonia nitrogen recovery desorption liquid storage tank 15 .
[0035] The ammonia nitrogen recovery desorption liquid storage tank 15 is connected to the adsorption tank 4 through the electromagnetic flowmeter 12. The concentrated liquid and flushing water discharged during the desorption process of the saturated adsorption material are fed back through the electromagnetic flowmeter 12 to control the opening and closing of the reflux desorption liquid electric valve 13 and the ammonia nitrogen recovery liquid electric valve 14 respectively; when the ammonia nitrogen concentration of the desorption liquid is low, the reflux desorption liquid electric valve 13 is opened, and the ammonia nitrogen recovery liquid electric valve 14 is closed at the same time, and the low ammonia nitrogen concentration desorption liquid is refluxed to the raw water tank 1 through the pipeline; when the ammonia nitrogen concentration of the desorption liquid is very high, the reflux desorption liquid electric valve 13 is closed, and the ammonia nitrogen recovery liquid electric valve 14 is opened at the same time, and the high ammonia nitrogen concentration desorption liquid is discharged to the ammonia nitrogen recovery desorption liquid storage tank 15 through the pipeline. Through the desorption liquid separation system, the volume of the ammonia nitrogen recovery liquid of the device can be effectively reduced, the energy consumption of the evaporation system can be reduced, and a high ammonia nitrogen recovery rate can be ensured at the same time.
[0036] The device is also provided with a pH regulating system, which includes a pipeline mixing valve 3, an online pH meter 6, an acid dosing pump 7, and an acid storage tank 8. The pipeline mixing valve 3 is connected to the pipeline between the raw water pump 2 and the adsorption tank 4, and the acid dosing pump 7 and the acid storage tank 8 are connected in sequence through the pipeline mixing valve 3. The acid dosing pump 7 controls the acid dosage through the online pH meter 6.
[0037] Furthermore, the device is also provided with a desorption salt preparation tank 9, a flushing pump 10, and a desorption pump 11; the desorption salt preparation tank 9 is connected to the adsorption tank 4 through the desorption pump 11, and the liquid discharged during the desorption process enters the desorption liquid separation system; the water production tank 5 is connected to the adsorption tank 4 through the flushing pump 10. The adsorption tank 4 is saturated with desorption flushing water using the device to produce water, and the device does not need to be provided with a separate flushing water tank.
[0038] This device is suitable for the recovery of ammonia nitrogen from evaporation condensed water with ammonia nitrogen concentration <500mg / L in the fertilizer industry. The device does not introduce new ions, and the evaporation condensed water does not need to be cooled. The treatment effect is good, the water production rate can reach 97%, the pH value of the produced water is 6-9, and the ammonia nitrogen concentration of the produced water is stable <10mg / L; the high-concentration ammonia nitrogen desorption liquid returns to the evaporation system to evaporate and recover ammonia nitrogen, and the ammonia nitrogen recovery rate of the desorption liquid can reach 94%. The utility model occupies a small area, the system is safe to use, low in energy consumption, good in water saving, and low in operating costs. The adsorption material desorption agent uses industrial salt, and the water used during the operation of the device is all produced by the device itself. This device can be produced in a modular manner, with a high degree of integration and automation, stable product quality, and unmanned operation.
[0039] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.
Claims
1. An ammonia nitrogen recovery device for treating evaporated condensed water by adsorption, characterized in that: It comprises a raw water tank (1), a raw water pump (2), an adsorption tank (4), a produced water tank (5), and a desorption liquid separation system; The raw water tank (1) is used to store evaporated condensed water raw water, and the raw water tank (1) is connected to the adsorption tank (4) via the raw water pump (2); The adsorption tank (4) is connected to the water production tank (5), and the water production tank (5) is used to store water produced after ammonia nitrogen is desorbed. The produced water can be used for salt preparation and desorption and flushing of the adsorption tank (4), and the excess produced water can be reused for production; The desorption liquid separation system comprises an electromagnetic flow meter (12), a reflux desorption liquid electric valve (13), an ammonia nitrogen recovery liquid electric valve (14), and an ammonia nitrogen recovery desorption liquid storage tank (15); The ammonia nitrogen recovery desorption liquid storage tank (15) is connected to the adsorption tank (4) via an electromagnetic flowmeter (12). The concentrated liquid and flushing water discharged during the desorption process of the saturated adsorption material are fed back through the electromagnetic flowmeter (12) to control the opening and closing of the reflux desorption liquid electric valve (13) and the ammonia nitrogen recovery liquid electric valve (14). When the ammonia nitrogen concentration of the desorption liquid is low, the reflux desorption liquid electric valve (13) is opened, and the ammonia nitrogen recovery liquid electric valve (14) is closed at the same time, and the low ammonia nitrogen concentration desorption liquid is refluxed to the raw water tank (1) through the pipeline. When the ammonia nitrogen concentration of the desorption liquid is very high, the reflux desorption liquid electric valve (13) is closed, and the ammonia nitrogen recovery liquid electric valve (14) is opened at the same time, and the high ammonia nitrogen concentration desorption liquid is discharged to the ammonia nitrogen recovery desorption liquid storage tank (15) through the pipeline.
2. The ammonia nitrogen recovery device for treating evaporated condensed water by adsorption as claimed in claim 1, characterized in that: It also includes a pH adjustment system, which includes a pipeline mixing valve (3), an online pH meter (6), an acid dosing pump (7), and an acid storage tank (8); The pipeline mixing valve (3) is connected to the pipeline between the raw water pump (2) and the adsorption tank (4), and is connected to the acid dosing pump (7) and the acid storage tank (8) in sequence through the pipeline mixing valve (3). The acid dosing pump (7) controls the acid dosage through the online pH meter (6).
3. The ammonia nitrogen recovery device for adsorption treatment of evaporated condensed water as claimed in claim 2, characterized in that: It also includes a desorption salt preparation tank (9), a flushing pump (10), a desorption pump (11) and a desorption liquid separation system; The desorption salt preparation tank (9) is connected to the adsorption tank (4) via a desorption pump (11), and the liquid discharged during the desorption process enters the desorption liquid separation system; the water production tank (5) is connected to the adsorption tank (4) via a flushing pump (10); and the adsorption tank (4) is saturated with desorption flushing water using a device to produce water.