A system for recovering ammonia-containing wastewater

Abstract

The utility model relates to a chemical industry, specifically is a kind of ammonia-containing wastewater recovery system, including the recovery tank of buried sealing arrangement, each recovery tank and the number of ammonia-containing wastewater discharge port correspond;Inclined arrangement's recovery pipeline is inserted into the ground and is communicated with the tank cavity of recovery tank, the end of recovery pipeline located on ground is communicated with the outlet of reversing valve, the reversing valve first inlet of reversing valve is communicated with corresponding ammonia-containing wastewater discharge port, and the reversing valve second inlet of reversing valve is communicated with flushing pipe;Recovery pipeline includes coaxially arranged inner sleeve and outer sleeve, and inner sleeve is along the axis of outer sleeve and is slidably engaged with outer sleeve, and the lumen of inner sleeve is for ammonia-containing wastewater flow.The utility model is overall buried design, avoid ammonia ion volatile pollution, only retain one section of recovery pipeline mouth to be located on ground, greatly reduce the occupancy rate to plant space, and it is convenient for the cleaning of pipeline.

Description

Technical Field

[0001] This utility model relates to the chemical industry, specifically an ammonia-containing wastewater recovery system. Background Technology

[0002] In urea production, the process condensate and the flushing water from equipment, pipelines, and pumps contain a large amount of ammonia ions, which together form ammonia-containing wastewater. To treat this ammonia-containing wastewater, drainage ditches are usually dug in the plant area. The ammonia-containing wastewater is collected through the drainage ditches and then flows into the sewage ditch in the plant area for centralized treatment. However, during the process of collecting ammonia-containing wastewater through the drainage ditches, the ammonium ions in the wastewater will be converted into free ammonia and volatilize into the air in large quantities, causing environmental pollution.

[0003] To solve this problem, the usual approach is to install recycling pipelines within the factory area to collect wastewater discharged from various ammonia-containing wastewater outlets and then collect it in a sewage ditch for centralized treatment. However, while this method of laying a large number of pipelines avoids the volatilization of ammonia ions, it also occupies a lot of factory space. In addition, the winding and complex pipelines are difficult to clean, and any node may affect the normal operation of the entire system. Therefore, a solution is urgently needed. Utility Model Content

[0004] To avoid and overcome the technical problems existing in the prior art, this utility model provides an ammonia-containing wastewater recovery system. This utility model adopts an overall buried design, which avoids ammonia ion volatilization pollution while only retaining a section of the recovery pipeline at ground level, significantly reducing the space occupied in the plant area and facilitating pipeline cleaning.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An ammonia-containing wastewater recovery system includes buried, sealed recovery tanks, each corresponding to a number of ammonia-containing wastewater discharge outlets; an inclined recovery pipeline inserted underground and connected to the tank cavity of the recovery tank, with the above-ground end of the recovery pipeline connected to the outlet of a reversing valve, the first inlet of the reversing valve connected to the corresponding ammonia-containing wastewater discharge outlet, and the second inlet of the reversing valve connected to a flushing pipe; the recovery pipeline includes an inner sleeve and an outer sleeve arranged coaxially, the inner sleeve slidingly engaging with the outer sleeve along its axis, and the cavity of the inner sleeve supplying flow for ammonia-containing wastewater.

[0006] As a further embodiment of this utility model: a groove is provided on the recycling tank, and the underground pipe opening of the outer sleeve is coaxially connected to the groove opening of the recycling tank. A filter box is provided inside the recycling tank. The surface of the filter box is in the shape of a filter screen. A water inlet corresponding to the position of the groove opening of the recycling tank is provided on the filter box to allow solid matter to enter. Wastewater in the inner sleeve passes through the groove opening of the recycling tank and the filter box in sequence and then enters the recycling tank. The pipe opening of the inner sleeve abuts and is positioned against the filter box.

[0007] As a further improvement of this utility model: the top of the recovery tank is provided with an openable tank cover, and the tank cover is independently provided with a manhole corresponding to the vertical position of the filter box. The suction pipe is inserted into the recovery tank and cooperates with the submersible pump to suction ammonia-containing wastewater.

[0008] As a further improvement of this utility model: a flip-openable and closable pipe cover is installed at the opening of the outer tube. An axial hole is opened on the cover plate of the pipe cover to connect with the inner tube. The outlet of the reversing valve is connected to the inner tube through the opening on the cover plate of the pipe cover. The inner tube is pressed and fixed by the pipe cover.

[0009] As a further embodiment of this utility model: the inner sleeve includes at least two sets of branch pipes arranged sequentially along the axial direction, each branch pipe has a positioning groove at its opening, the positioning grooves of two adjacent branch pipes are inserted and positioned, and then locked and positioned by fastening bolts, and the mating surfaces of two adjacent branch pipes are sealed with sealing rings.

[0010] As a further embodiment of this utility model: the second inlet of the reversing valve is coaxially arranged with the inner sleeve, and the second inlet of the reversing valve is connected to the flushing pipe through a check valve; the first inlet of the reversing valve is connected to the ammonia-containing wastewater discharge port through a detachable connecting joint.

[0011] As a further improvement of this invention, an electrochemical sensor is installed in the recovery tank to monitor the gas concentration.

[0012] As a further improvement of this utility model: the outer sleeve is a stainless steel pipe, and the inner sleeve is a polyethylene pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. This utility model adopts an overall buried design, avoiding ammonia ion volatilization pollution while retaining only one section of the recovery pipeline at ground level, significantly reducing the space occupied in the plant area. During wastewater discharge, the reversing valve switches to connect the first inlet and outlet, allowing ammonia-containing wastewater to flow into the filter box of the recovery tank through the inner sleeve of the recovery pipeline. Solid impurities are intercepted, and the liquid enters the tank cavity. After short-term discharge, the reversing valve switches to connect the second inlet and outlet, allowing flushing water to enter the recovery pipeline through a check valve to clean the inner sleeve and prevent crystallization on the inner sleeve wall. Once the wastewater in the recovery tank reaches the set capacity, a submersible pump extracts the wastewater from the recovery tank through a suction pipe, and the wastewater is transported by a wastewater transfer truck to a treatment station for centralized processing, forming a closed-loop recovery system. The inner and outer sleeve design of the recovery pipeline allows the inner sleeve to be pulled out for independent cleaning when the flushing and crystallization removal effect is insufficient.

[0014] 2. The inner sleeve of this utility model is made up of multiple branch pipes. When flushing cannot remove stubborn crystals or a section of the pipe is corroded and damaged, it is not necessary to replace the entire pipeline. After the inner sleeve is pulled out and disassembled, each branch pipe can be cleaned or partially replaced, further reducing maintenance costs. The alternating operation of flushing and disassembly effectively reduces the crystal adhesion on the inner sleeve wall and maintains the pipeline's long-term smooth flow. The insertion and positioning bolt fixing method of the inner sleeve facilitates quick disassembly and assembly.

[0015] 3. This utility model effectively intercepts crystals and solid particles in wastewater by setting up a mesh filter box in the recycling tank to prevent clogging. Combined with the regularly used flushing pipeline, it effectively reduces the crystals on the inner sleeve wall.

[0016] 4. The outer sleeve cap of this utility model can press and seal the inner sleeve. After opening, the inner sleeve can be pulled out for regular cleaning. The one-way valve at the flushing pipe inlet effectively prevents harmful gases such as ammonia in the recovery system from leaking back through the flushing pipe, thus improving safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the inner sleeve in this utility model.

[0019] In the picture: 1. Reversing valve; 2. Recovery pipeline; 11. Reversing valve outlet; 12. Reversing valve first inlet; 13. Reversing valve second inlet; 21. Outer sleeve; 22. Inner sleeve; 221. Branch pipe; 222. Fastening bolt; 223. Sealing ring; 224. Positioning groove; 23. Pipe cover; 3. Recycling tank; 31. Filter box; 311. Inlet; 32. Suction pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-2In this embodiment of the present invention, an ammonia-containing wastewater recovery system is provided. Each ammonia-containing wastewater discharge outlet in the plant area is equipped with a recovery tank 3 underground. A tank cover is installed at ground level with the recovery tank 3, allowing for cleaning after the cover is opened. Each tank cover also has an independently operable manhole. A filter box 31, fixedly connected to the tank wall of the recovery tank 3, is located directly below the manhole along the vertical direction. The filter box 31 has a mesh-like wall for filtering crystals and solid particles from the wastewater. A slot is formed in the tank wall of the recovery tank 3 for welding and fixing to the outer sleeve 21 of the recovery pipeline 2. An inlet 311, coaxially arranged with the slot of the recovery tank 3, is provided on the filter box 31. The diameter of the inlet 311 is smaller than the diameter of the slot of the recovery tank 3 to facilitate positioning of the inner sleeve 22 of the recovery pipeline 2.

[0022] The recovery pipeline 2 is inserted into the ground at an angle. Its structure is a double-sleeve design, including an inner sleeve 22 and an outer sleeve 21 arranged coaxially. The inner sleeve 22 slides along the axis of the outer sleeve 21, and the lengths of the inner sleeve 22 and outer sleeve 21 correspond. After the outer sleeve 21 is pre-inserted and fixed underground, its end is welded to the wall of the recovery tank 3. Then, the inner sleeve 22 is inserted into the outer sleeve 21 from the ground until it abuts and is positioned against the filter box 31. The opening of the inner sleeve 22 is coaxially connected to the inlet 311 of the filter box 31, serving as a flow channel for ammonia-containing wastewater. The wastewater in the inner sleeve 22 passes through the filter box 31 to filter solids and then enters the recovery tank 3 for storage. When the wastewater in the recovery tank 3 reaches a set volume, the suction pipe 32 is inserted into the recovery tank 3 and, in conjunction with a submersible pump, extracts the ammonia-containing wastewater and transfers it to a transport vehicle for centralized treatment. An electrochemical sensor can be installed in the recovery tank 3 to monitor the gas concentration. If the concentration exceeds the standard, the ammonia-containing wastewater will be extracted in advance.

[0023] A flip-top cap 23 is installed at the opening of the outer sleeve 21 on the ground. The cap 23 has an axially oriented hole for connecting to the inner sleeve 22. The cap connects to the inner sleeve 22 while simultaneously pressing and securing it. A sealing ring can be installed between the cap 23 and the inner sleeve 22 to improve sealing performance. The outer sleeve 21 is made of corrosion-resistant stainless steel, and the inner sleeve 22 is made of chemically resistant polyethylene.

[0024] The inner sleeve 22 is composed of at least two sets of branch pipes 221 connected sequentially along the axial direction. A positioning groove 224 is provided at the opening of each branch pipe 221. Adjacent branch pipes are positioned by insertion through the positioning grooves. The shape of the positioning grooves 224 is not limited. In this application, the ends of the branch pipes 221 have a two-stage stepped columnar groove structure. The positioning grooves 224 at the ends of two adjacent branch pipes 221 are respectively narrower on the outside and wider on the inside, and wider on the outside and narrower on the inside, thus forming an integral structure after insertion. After insertion, each branch pipe 221 is locked by fastening bolts 222. The positions of the fastening bolts 222 correspond to the positions of each positioning groove 224, locking each branch pipe 221 radially. The mating surfaces of each branch pipe 221 are sealed with sealing rings 223 to ensure that the pipeline does not leak during long-term use. Positioning grooves 224 are not provided at the openings of the branch pipes 221 located at both ends.

[0025] It also includes a two-inlet, one-outlet reversing valve 1. The reversing valve outlet 11 of the reversing valve 1 is connected to the inner sleeve 22 through an opening on the cover plate of the pipe cover 23, directly conveying wastewater into the inner sleeve 22. The first inlet 12 of the reversing valve is connected to the ammonia-containing wastewater discharge port through a detachable connection joint, such as a corrugated connection joint, for receiving wastewater. A valve is installed at the first inlet 12 of the reversing valve to control its opening and closing. The second inlet 13 of the reversing valve is connected to the flushing pipe for system flushing. During flushing operations, the valve at the first inlet 12 of the reversing valve is closed. To maximize the flushing effect, the second inlet 13 of the reversing valve is coaxially arranged with the reversing valve outlet 11. A check valve can be installed at the second inlet 13 of the reversing valve to prevent waste gas leakage. Regular flushing removes crystals on the wall of the inner sleeve 22.

[0026] The inner sleeve 22 features a segmented design. If the flushing effect is unsatisfactory after prolonged use, the connection between the ammonia-containing wastewater discharge port and the first inlet 12 of the reversing valve can be disconnected first. Then, the pipe cover 23 can be opened, and the branch pipe 221 can be pulled out as a whole. After extraction, each branch pipe 221 can be disassembled and cleaned independently to remove stubborn crystals from its inner wall. If a section of branch pipe 221 suffers excessive corrosion damage, that section of branch pipe 221 can also be directly replaced.

[0027] During the wastewater discharge stage, reversing valve 1 switches to connect with the first inlet 12 and outlet 11. Ammonia-containing wastewater flows into the filter box 31 of the recovery tank 3 through the inner sleeve 22 of the recovery pipeline 2, where solid impurities are intercepted and liquid enters the tank cavity. After a short-term discharge operation, reversing valve 1 switches to connect with the second inlet 13 and outlet 11. Flushing water enters the recovery pipeline 2 through a check valve to clean the inner sleeve 22 and prevent crystallization on the inner sleeve 22 wall. Once the wastewater in the recovery tank 3 reaches the set capacity, a submersible pump extracts the wastewater from the recovery tank through the suction pipe 32, and the wastewater is transported by a wastewater transfer truck to the treatment station for centralized processing.

[0028] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0029] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

Claims

1. An ammonia-containing wastewater recovery system, characterized in that, The system includes buried sealed recycling tanks (3), each recycling tank (3) corresponding to the number of ammonia-containing wastewater discharge outlets; an inclined recycling pipeline (2) is inserted underground and connected to the cavity of the recycling tank (3), the end of the recycling pipeline (2) located above ground is connected to the outlet of the reversing valve (1), the first inlet (12) of the reversing valve (1) is connected to the corresponding ammonia-containing wastewater discharge outlet, and the second inlet (13) of the reversing valve (1) is connected to the flushing pipe; the recycling pipeline (2) includes an inner sleeve (22) and an outer sleeve (21) arranged coaxially, the inner sleeve (22) slides along the axis of the outer sleeve (21) and the outer sleeve (21), and the cavity of the inner sleeve (22) is used for the flow of ammonia-containing wastewater.

2. The ammonia-containing wastewater recovery system according to claim 1, characterized in that, The recycling tank (3) has an opening. The underground pipe opening of the outer sleeve (21) is coaxially connected to the opening of the recycling tank (3). The recycling tank (3) is equipped with a filter box (31). The surface of the filter box (31) is in the shape of a filter screen. The filter box (31) has an inlet (311) corresponding to the position of the opening of the recycling tank (3) for solids to enter. The wastewater in the inner sleeve (22) passes through the opening of the recycling tank (3) and the filter box (31) in sequence and then enters the recycling tank (3). The pipe opening of the inner sleeve (22) is in contact with the filter box (31) for positioning.

3. The ammonia-containing wastewater recovery system according to claim 2, characterized in that, The top of the recovery tank (3) is provided with an openable tank cover. The tank cover is independently provided with a manhole corresponding to the vertical position of the filter box (31). The suction pipe (32) is inserted into the recovery tank (3) and cooperates with the submersible pump to suck up ammonia-containing wastewater.

4. The ammonia-containing wastewater recovery system according to claim 1, characterized in that, A flip-opening and closing pipe cover (23) is installed at the pipe opening of the outer tube (21). The cover plate of the pipe cover (23) has an axial hole to connect with the inner tube (22). The reversing valve outlet (11) of the reversing valve (1) is connected to the inner tube (22) through the hole on the cover plate of the pipe cover (23). The inner tube (22) is pressed and fixed by the pipe cover (23).

5. An ammonia-containing wastewater recovery system according to any one of claims 1 to 4, characterized in that, The inner sleeve (22) includes at least two sets of branch pipes (221) arranged sequentially along the axial direction. Each branch pipe (221) has a positioning groove (224) at its opening. After the positioning grooves (224) of two adjacent branch pipes (221) are inserted and positioned, they are locked and positioned by fastening bolts (222). The mating surfaces of two adjacent branch pipes (221) are sealed with sealing rings (223).

6. An ammonia-containing wastewater recovery system according to any one of claims 1 to 4, characterized in that, The second inlet (13) of the reversing valve (1) is coaxially arranged with the inner sleeve (22), and the second inlet (13) of the reversing valve is connected to the flushing pipe through a check valve; the first inlet (12) of the reversing valve (1) is connected to the ammonia-containing wastewater discharge port through a detachable connecting joint.

7. An ammonia-containing wastewater recovery system according to any one of claims 1 to 4, characterized in that, An electrochemical sensor is installed in the recovery tank (3) to monitor the gas concentration.

8. An ammonia-containing wastewater recovery system according to any one of claims 1 to 4, characterized in that, The outer sleeve (21) is a stainless steel pipe, and the inner sleeve (22) is a polyethylene pipe.

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