Deamination tower
By designing a multi-stage structure and components for the ammonia removal tower, the problems of difficult removal of ammonia nitrogen and scaling in ammonia nitrogen wastewater were solved, achieving efficient ammonia nitrogen removal and reduced scaling.
Patent Information
- Application Number
- CN202422693204.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-06
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-11-06
AI Technical Summary
Ammonia nitrogen is difficult to remove effectively from ammonia nitrogen wastewater, and the addition of alkaline solution causes Ca and Mg ions to precipitate, increasing scaling problems on the surface of tower internals and packing.
Design an ammonia stripping tower, including an inlet pipe, a outlet pipe, an exhaust pipe, and vertically connected from top to bottom a condensation and concentration structure, a distillation structure, a stripping ammonia stripping structure, a falling film evaporation structure, and a reboiler structure. Utilize multiple floating valve trays, a water distributor, a perforated metal corrugated packing, and a condenser to achieve efficient stripping and condensation of ammonia nitrogen and prevent scaling.
It achieves efficient removal of ammonia nitrogen, reduces scaling on the internal components and packing surfaces of the tower, and improves ammonia removal efficiency and equipment operational stability.
Smart Images
Figure CN223620168U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of ammonia removal tower technology, and more specifically, relates to an ammonia removal tower. Background Technology
[0002] In the production of non-ferrous metallurgy and new energy cathode materials, ammonia nitrogen wastewater is a common type of industrial wastewater. It not only contains high concentrations of ammonia nitrogen pollutants but is also rich in inorganic salts, particularly Ca and Mg ions. The presence of these components poses a significant challenge to wastewater treatment. Traditionally, stripping ammonia removal technology has been widely used in the treatment of such wastewater due to its high efficiency. This technology removes ammonia nitrogen by heating the wastewater to release it as ammonia gas.
[0003] However, in practice, ammonia nitrogen wastewater often contains solid particulate impurities, which easily deposit and adhere to the internal components and packing surfaces of the ammonia stripping tower during the stripping process. Simultaneously, to optimize the stripping effect, it is usually necessary to add alkali to the wastewater during the pretreatment stage to adjust its pH to a suitable range, thereby promoting ammonia nitrogen stripping efficiency. However, this step also exacerbates the scaling problem, as the addition of alkali makes it easier for Ca and Mg ions in the wastewater to form insoluble hydroxide precipitates. These precipitates further intensify scaling on the tower internals and packing surfaces. Utility Model Content
[0004] The purpose of this application is to provide an ammonia removal tower to solve the technical problem of difficulty in removing ammonia from ammonia nitrogen wastewater in the prior art.
[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:
[0006] A deammonia removal tower is provided, comprising an inlet pipe, a outlet pipe, an exhaust pipe, and a condensation and concentration structure, a distillation structure, a stripping deammonia removal structure, a falling film evaporation structure, and a tower bottom structure connected sequentially from top to bottom in a vertical direction;
[0007] The inlet pipe leads into the stripping and ammonia removal structure, and the raw liquid sequentially passes through the stripping and ammonia removal structure and the falling film evaporation structure to generate ammonia-containing vapor and waste liquid; the outlet pipe is located at the bottom end of the column bottom structure, and the waste liquid is discharged through the outlet pipe; the exhaust pipe is located at the top of the condensation and concentration structure, and the ammonia-containing vapor is discharged from the exhaust pipe after passing through the distillation structure and the condensation and concentration structure.
[0008] As a further improvement to the above technical solution:
[0009] Optionally, the stripping and ammonia removal structure includes multiple floating valve trays, which are arranged sequentially in a vertical direction, allowing ammonia-containing vapor to pass through each of the floating valve trays in sequence.
[0010] Optionally, the floating valve tray includes a tray body and a liquid guide plate. The liquid guide plate is connected to one end of the tray body and is used to guide the liquid to flow to the lower layer of the floating valve tray. The positions of the liquid guide plates of each floating valve tray are arranged alternately in the vertical direction.
[0011] Optionally, the vertical spacing between the floating valve trays ranges from 400mm to 600mm.
[0012] Optionally, the falling film evaporation structure includes a water collector and a falling film evaporator reboiler arranged sequentially in a vertical direction. The water collector is located at the bottom of the stripping and ammonia removal structure. After the raw liquid passes through the water collector, it drips onto the falling film evaporator reboiler to generate ammonia-containing vapor. The raw liquid that does not form ammonia-containing vapor flows into the bottom structure as waste liquid.
[0013] Optionally, the distillation structure includes a metal perforated plate corrugated packing, through which ammonia vapor can pass to contact the ammonia vapor with the reflux ammonia water.
[0014] Optionally, the distillation structure further includes a liquid guiding grid, which is located on top of the metal perforated plate corrugated packing, and the reflux ammonia water can flow through the liquid guiding grid to the metal perforated plate corrugated packing.
[0015] Optionally, the condensation and concentration structure includes a condenser, a rising gas collection plate, and a redistributor arranged vertically from top to bottom. Ammonia-containing vapor passes through the redistributor and the rising gas collection plate in sequence and then contacts the condenser. The condenser is used to condense the water vapor in the ammonia-containing vapor to form ammonia gas and reflux ammonia water. The ammonia gas is discharged from the exhaust pipe, and the reflux ammonia water passes through the rising gas collection plate and the redistributor and then flows back to the metal perforated plate corrugated packing.
[0016] Optionally, a demister may also be included, which is located at the inlet of the exhaust pipe.
[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0018] The ammonia stripping tower provided in this application includes an inlet pipe, a outlet pipe, a steam exhaust pipe, and vertically connected from top to bottom a condensation and concentration structure, a distillation structure, a stripping ammonia stripping structure, a falling film evaporation structure, and a reboiler structure. The inlet pipe leads into the stripping ammonia stripping structure, where the raw liquid sequentially passes through the stripping ammonia stripping structure and the falling film evaporation structure to generate ammonia-containing vapor and waste liquid. The ammonia-containing vapor rises after being heated and undergoes dehydration through the distillation structure and the condensation and concentration structure, forming a high-concentration ammonia-water mixed vapor, which is then discharged from the steam exhaust pipe. The waste liquid flows downwards into the reboiler structure, where the outlet pipe is located at the bottom, allowing the waste liquid to exit the ammonia stripping tower. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the structural layout of the ammonia removal tower in this application.
[0021] The following are the labeling elements in the figure:
[0022] 1. Tower reboiler structure; 2. Falling film evaporator reboiler;
[0023] 3. Water distribution device; 5. Float valve tray;
[0024] 7. Orifice plate corrugated packing; 8. Liquid guiding grid;
[0025] 9. Redistributor; 10. Gas-collecting tray;
[0026] 11. Condenser; 12. Demister. Detailed Implementation
[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.
[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.
[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0031] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.
[0032] like Figure 1 As shown, this application provides a deammoniation tower, including an inlet pipe N5, a outlet pipe N1, an exhaust pipe N10, and a condensation and concentration structure, a distillation structure, a stripping deammoniation structure, a falling film evaporation structure, and a tower bottom structure 1 that are connected sequentially from top to bottom in the vertical direction.
[0033] The inlet pipe N5 leads into the stripping and ammonia removal structure. The raw liquid sequentially passes through the stripping and ammonia removal structure and the falling film evaporation structure, generating ammonia-containing vapor and waste liquid. The ammonia-containing vapor rises after being heated, and after dehydration by the rectification structure and the condensation and concentration structure, it forms a high-concentration ammonia-water mixed vapor, which is then discharged from the exhaust pipe N10. The waste liquid flows downward into the bottom structure 1 of the tower. The drain pipe N1 is located at the bottom of the bottom structure 1, and the waste liquid is discharged from the ammonia removal tower through the drain pipe.
[0034] In one specific embodiment of this application, the stripping ammonia removal structure specifically includes multiple floating valve trays 5. The floating valve trays 5 are arranged sequentially in a vertical direction. The raw liquid flows through the inlet pipe N5 to the uppermost floating valve tray 5. Ammonia-containing vapor can sequentially pass through each floating valve tray 5, thereby ensuring thorough mixing of the ammonia nitrogen in the raw liquid with the rising ammonia-containing vapor for stripping ammonia removal. As the raw liquid flows through each floating valve tray 5 layer by layer, the ammonia nitrogen content decreases progressively.
[0035] In one specific embodiment of this application, the floating valve tray 5 can be a T-shaped guided jet floating valve tray, which includes a tray body, valve orifices, floating valve plates, an overflow weir, and a guide plate. The overflow weir is located on the side edge of the tray body to form a weir for accumulating raw liquid on the tray body, and the height of the overflow weir ranges from 40mm to 75mm. The tray body has multiple valve orifices, each equipped with a movable floating valve plate. As the ammonia-containing vapor rises, it lifts the floating valve plates, allowing the ammonia-containing vapor to pass through the gap between the valve orifice and the floating valve plate, and ensuring sufficient contact between the ammonia-containing vapor and the raw liquid accumulated in the overflow weir. This allows the ammonia nitrogen in the raw liquid to be fully mixed with the rising ammonia-containing vapor for stripping and ammonia removal. The guide plate is connected to one end of the tray body and guides the liquid to flow downwards into the floating valve tray 5. The guide plates of each floating valve tray 5 are arranged alternately in the vertical direction, causing the raw liquid to flow down through multiple bends, increasing the contact path between the ammonia-containing vapor and the raw liquid.
[0036] In one specific embodiment of this application, the vertical distance between each floating valve tray 5 is in the range of 400mm-600mm.
[0037] In one specific embodiment of this application, the falling film evaporation structure includes a water distributor 3 and a falling film evaporator reboiler 2 arranged sequentially along the vertical direction.
[0038] The water distributor 3 is located at the bottom of the stripping and ammonia removal structure. In each floating valve tray 5, the raw liquid overflows from the bottommost floating valve tray 5 onto the water distributor 3, which is used to evenly distribute water onto the evaporation surface of the falling film evaporator-reboiler 2. A steam source is connected to the heat pipe N3 of the falling film evaporator-reboiler 2, heating it with steam. After passing through the water distributor 3, the raw liquid drips onto the falling film evaporator-reboiler 2 to generate ammonia-containing vapor. Through the distribution effect of the floating valve plates on the floating valve trays 5, the ammonia-containing vapor comes into full contact with the raw liquid accumulated in the overflow weir, causing the ammonia in the raw liquid to escape in gaseous form, increasing the ammonia content in the ammonia-containing vapor. The raw liquid that does not form ammonia-containing vapor flows to the bottom structure 1 as waste liquid and is discharged from the ammonia removal tower through the drain pipe N1.
[0039] In one specific embodiment of this application, the distillation structure includes a metal perforated plate corrugated packing 7, through which ammonia vapor can pass to contact the reflux ammonia water. After the reflux ammonia water is heated by the ammonia vapor, the free ammonia in the reflux ammonia water escapes into the ammonia vapor, thereby achieving the purpose of distillation and concentration.
[0040] In one specific embodiment of this application, the distillation structure further includes a liquid guiding grid 8, which is located on top of the perforated metal plate corrugated packing 7. Refluxed ammonia water can flow through the liquid guiding grid 8 to the perforated metal plate corrugated packing 7. The angle of the slats on the liquid guiding grid 8 ranges from 50° to 70°. The liquid guiding grid 8 can evenly distribute the rising ammonia-containing vapor and guide the liquid, preventing splashing of refluxed ammonia water and causing flow deviation.
[0041] In one specific embodiment of this application, the condensation and enrichment structure includes a condenser 11, a rising gas collection plate 10, and a redistributor 9 arranged vertically from top to bottom. Ammonia-containing vapor passes through the redistributor 9 and the rising gas collection plate 10 before contacting the condenser 11. The condenser 11 condenses the water vapor in the ammonia-containing vapor, reducing its water content and forming ammonia gas or high-concentration ammonia-containing vapor. The condensate adhering to the condenser 11 absorbs a small amount of ammonia gas to form reflux dilute ammonia water. A condenser is injected into the condenser 11 through the N7 or N8 port of the heat exchange tubes. The number and specifications of the heat exchange tubes are calculated and selected based on the specific flow rate of the ammonia-containing vapor. The steam temperature at the inlet and outlet of the condenser 11 tubes is measured using temperature measuring devices (T4, T5), and the shell-side circulating cooling water flow rate is adjusted to achieve condensation of water in the steam and further enrichment of ammonia gas or high-concentration ammonia-containing vapor. Ammonia gas or high-concentration ammonia vapor is discharged from the exhaust pipe N10. The returned ammonia water, after passing through the rising gas collection plate 10 and the redistributor 9, flows back to the metal orifice plate corrugated packing 7, where it contacts the ammonia vapor rising from the stripping and ammonia removal structure. The redistributor 9 is specifically a three-stage composite distributor, combining the characteristics of pipe distributors, trough distributors, and disc distributors to form multi-stage buffering and distribution. The distribution troughs in each stage of the distributor have multi-stage teardrop-shaped openings. The function of the redistributor 9 is to ensure uniform liquid distribution under any return flow condition, exhibiting high operational flexibility. The rising gas collection plate 10 allows the lower ammonia vapor to rise smoothly and be evenly distributed. Simultaneously, it collects and guides the upper condensed dilute ammonia water, directing it to the redistributor 9. The rising gas collection plate 10 is air-permeable but water-leakage-free.
[0042] In one specific embodiment of this application, the ammonia removal tower further includes a demister 12, which is located at the inlet of the exhaust pipe. The demister 12 can remove droplets of 3µm-5µm to prevent condensate from exiting the tower with high-concentration ammonia-containing vapor, thereby increasing the concentration of ammonia water exiting the tower, ensuring the quality of recovered ammonia water, reducing the condensation amount of the downstream condensing equipment of the ammonia removal tower, and reducing energy consumption.
[0043] In one specific embodiment of this application, the skirt, insulation layer and other structures of the deammoniation tower are conventional technical features and can be set according to the actual situation of the deammoniation tower, and will not be described in detail here.
[0044] like Figure 1As shown, the main process ports are described as follows: N1 is the drain outlet, N2 is the steam condensate outlet, N3 is the steam inlet; N4 is the non-condensable steam outlet, N5 is the ammonia-nitrogen-containing raw wastewater inlet, N6 is the sampling outlet, N7 is the circulating cooling water outlet, N8 is the circulating cooling water inlet, N9 is the exhaust port, and N10 is the ammonia or high-concentration ammonia-containing steam outlet; P1-P5 are pressure gauge ports, T1-T5 are thermometer ports, G1 / G2 are level gauge ports, and other ports such as sight glasses and manholes are not further indicated in the figure.
[0045] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A deammoniation tower, characterized in that, It includes a liquid inlet pipe, a liquid outlet pipe, a steam outlet pipe, and a condensation and concentration structure, a distillation structure, a stripping and ammonia removal structure, a falling film evaporation structure, and a tower bottom structure connected in sequence from top to bottom in the vertical direction (1). The inlet pipe is connected to the stripping and ammonia removal structure. The raw liquid passes through the stripping and ammonia removal structure and the falling film evaporation structure in sequence to generate ammonia-containing vapor and waste liquid. The drain pipe is located at the bottom end of the tower bottom structure (1). The waste liquid is discharged through the drain pipe. The exhaust pipe is located at the top of the condensation and concentration structure. The ammonia-containing vapor passes through the distillation structure and the condensation and concentration structure and is discharged from the exhaust pipe.
2. The ammonia removal tower as described in claim 1, characterized in that, The stripping and ammonia removal structure includes multiple floating valve trays (5), which are arranged sequentially in the vertical direction, and ammonia-containing vapor can pass through each of the floating valve trays (5) in sequence.
3. The ammonia removal tower as described in claim 2, characterized in that, The floating valve tray (5) includes a tray body and a liquid guide plate. The liquid guide plate is connected to one end of the tray body and is used to guide the liquid to flow to the lower layer of the floating valve tray (5). The positions of the liquid guide plates of each floating valve tray (5) are arranged alternately in the vertical direction.
4. The ammonia removal tower as described in claim 2, characterized in that, The vertical distance between each of the floating valve trays (5) is 400mm-600mm.
5. The ammonia removal tower as described in claim 1, characterized in that, The falling film evaporation structure includes a water collector (3) and a falling film evaporation reboiler (2) arranged in sequence along the vertical direction. The water collector (3) is located at the bottom of the stripping and ammonia removal structure. The raw liquid drips onto the falling film evaporation reboiler (2) after passing through the water collector (3) to generate ammonia-containing vapor. The raw liquid that does not form ammonia-containing vapor flows into the bottom structure (1) as waste liquid.
6. The ammonia removal tower as described in claim 1, characterized in that, The distillation structure includes a metal perforated plate corrugated packing (7), through which ammonia vapor can pass to contact the ammonia vapor with the reflux ammonia water.
7. The ammonia removal tower as described in claim 6, characterized in that, The distillation structure also includes a liquid guiding grid (8), which is located on top of the metal perforated plate corrugated packing (7). The refluxed ammonia water can flow through the liquid guiding grid (8) to the metal perforated plate corrugated packing (7).
8. The ammonia removal tower as described in claim 6, characterized in that, The condensation and concentration structure includes a condenser (11), a rising gas collection plate (10), and a redistributor (9) arranged vertically from top to bottom. Ammonia vapor passes through the redistributor (9) and the rising gas collection plate (10) in sequence and then comes into contact with the condenser (11). The condenser (11) is used to condense the water vapor in the ammonia vapor and form ammonia gas and reflux ammonia water. The ammonia gas is discharged from the exhaust pipe. The reflux ammonia water passes through the rising gas collection plate (10) and the redistributor (9) and then flows back to the metal perforated plate corrugated packing (7).
9. The ammonia removal tower according to any one of claims 1 to 8, characterized in that, It also includes a demister (12), which is located at the inlet of the exhaust pipe.