Ammonia-containing wastewater treatment and recovery of ammonium sulfate crystallization device

Abstract

The application provides a crystallization device for treating ammonia-containing wastewater and recovering ammonium sulfate, and belongs to the technical field of ammonia-containing wastewater treatment. The device comprises an ammonia-containing wastewater storage tank, a reaction tank, a stirring assembly, a driving assembly, a transmission assembly and a piston assembly. The ammonia-containing wastewater storage tank and the reaction tank are placed side by side. Heating assemblies are arranged on the inner bottom of the ammonia-containing wastewater storage tank and the reaction tank. The stirring assembly is arranged inside the ammonia-containing wastewater storage tank and the reaction tank. The driving assembly is installed on the top of the reaction tank and is used to drive the stirring assembly to rotate, so as to stir the ammonia-containing wastewater in the ammonia-containing wastewater storage tank and the dilute sulfuric acid solution in the reaction tank. Compared with the prior art, the embodiment of the application can automatically complete the mixing reaction of the quantitative ammonia gas and the quantitative dilute sulfuric acid solution when the ammonia gas in the ammonia-containing wastewater is recovered and utilized, thereby improving the crystallization yield of ammonium sulfate.

Description

Technical Field

[0001] This invention belongs to the field of ammonia-containing wastewater treatment technology, specifically a device for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater. Background Technology

[0002] Nitrogen is one of the main pollutants in industrial and domestic wastewater. The discharge of ammonia-containing wastewater can lead to eutrophication of water bodies, cause the proliferation of microorganisms in the water, reduce dissolved oxygen levels, cause mass fish deaths, and even lead to the drying up of lakes, posing a great threat to the ecological environment and human health.

[0003] Currently, the treatment of ammonia-containing wastewater mostly involves heating the wastewater to release the ammonia gas, which is then passed into a dilute sulfuric acid solution to react with the sulfuric acid and form an ammonium sulfate solution. The ammonium sulfate solution is then heated to evaporate excess water, saturating the solution and causing crystals to precipitate. However, the amount of ammonia supplied during the ammonium sulfate crystallization process is often difficult to control. Too much ammonia leads to waste, while too little ammonia results in the formation of ammonium bisulfate. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide an apparatus for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: An apparatus for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater includes an ammonia-containing wastewater storage tank, a reaction tank, a stirring assembly, a drive assembly, a transmission assembly, and a piston assembly. The ammonia-containing wastewater storage tank and the reaction tank are placed side by side, and both the ammonia-containing wastewater storage tank and the reaction tank are equipped with heating components at their inner bottom. The stirring assembly is installed inside the ammonia-containing wastewater storage tank and the reaction tank. The drive assembly is installed on the top of the reaction tank and is used to drive the stirring assembly to rotate, thereby stirring the ammonia-containing wastewater inside the ammonia-containing wastewater storage tank and the dilute sulfuric acid solution inside the reaction tank. The piston assembly is disposed between the ammonia-containing wastewater storage tank and the reaction tank, and the transmission assembly is disposed at the top of the reaction tank. When the drive assembly drives the stirring assembly to rotate, the transmission assembly transmits the rotational power of the stirring assembly to the piston assembly, causing the piston assembly to reciprocate, thereby pumping a fixed amount of ammonia gas from inside the ammonia-containing wastewater storage tank to a fixed amount of dilute sulfuric acid solution inside the reaction tank.

[0006] As a further improvement of the present invention: the stirring assembly includes two sets of stirring vertical rods. One set of stirring vertical rods extends from the top of the ammonia-containing wastewater storage tank to the bottom, and the bottom of the stirring vertical rods penetrates the top wall of the ammonia-containing wastewater storage tank and extends into the interior of the ammonia-containing wastewater storage tank. The other set of stirring vertical rods extends from the top of the reaction tank to the bottom, and the bottom of the stirring vertical rods penetrates the top wall of the reaction tank and extends into the interior of the reaction tank. Several stirring horizontal rods are fixedly installed on the rods of both sets of stirring vertical rods located inside the ammonia-containing wastewater storage tank and the reaction tank.

[0007] As a further improvement of the present invention: the drive assembly includes a motor, a first gear, a second gear, a transmission belt, and a pulley. The motor is fixedly installed on the inner top wall of the reaction vessel. The first gear is located at the output end of the motor. The second gear is fixedly located outside the stirring rod on the reaction vessel. The second gear meshes with the first gear. There are two sets of pulleys. The two sets of pulleys are respectively fixedly located outside the two sets of stirring rods. The two sets of pulleys are connected by the transmission belt.

[0008] As a further improvement of the present invention: the two sets of stirring rods are hollow inside, and the upper ends of the two sets of stirring rods are connected to gas supply pipes through rotary joints. An air inlet is provided on the stirring rod of the reaction vessel, and the air inlet is located in the inner area of ​​the reaction vessel. The lower end of the stirring rod located on the ammonia-containing wastewater storage tank is rotatably connected to an exhaust pipe via a rotary joint, and the end of the exhaust pipe away from the stirring rod extends to the outside of the ammonia-containing wastewater storage tank.

[0009] As a further improvement of the present invention: the piston assembly includes a gas storage tank, a piston block, a first ammonia inlet pipe, a first ammonia outlet pipe, a second ammonia outlet pipe, and a second ammonia inlet pipe. The gas storage tank is fixedly disposed between the ammonia-containing wastewater storage tank and the reaction tank. The piston block is movably disposed inside the gas storage tank. The first end face of the gas storage tank is connected to the ammonia-containing wastewater storage tank through the first ammonia inlet pipe, and the second end face of the gas storage tank is connected to the reaction tank through the first ammonia outlet pipe. One end of the second ammonia outlet pipe is connected to the reaction vessel, and the other end is connected to the cavity inside the gas storage tank located between the piston block and the first end face. One end of the second ammonia inlet pipe is connected to the reaction vessel, and the other end is connected to the cavity inside the gas tank located between the piston block and the second end face. One-way valves are installed inside the first ammonia inlet pipe, the first ammonia outlet pipe, the second ammonia outlet pipe, and the second ammonia inlet pipe.

[0010] As a further improvement of the present invention: a first sliding groove is provided on the side wall of the gas storage tank. The transmission assembly includes a rack, a third gear, a support plate, a fourth gear, a connecting cross plate, a lever, a sliding plate, and a slide bar. The support plate is fixedly installed on the side wall of the gas storage tank. A rotating shaft is rotatably mounted on the inner top wall of the support plate. The fourth gear is fixedly mounted outside the rotating shaft. The upper part of one end of the connecting cross plate is fixedly connected to the bottom of the rotating shaft, and the lower part of the other end is fixedly connected to the lever. One end of the slide rod is fixedly connected to the piston block, and the other end extends from the first slide groove to the outside of the gas storage tank and is connected to the slide plate. A second slide groove is provided on the upper part of the slide plate, and the lever extends into the second slide groove. The third gear is fixedly installed outside the stirring vertical rod, and the rack is slidably installed in the ammonia-containing waste.

[0011] As a further improvement of the present invention: a guide assembly is further provided between the ammonia-containing wastewater storage tank and the reaction tank, the guide assembly being used to guide the sliding of the rack.

[0012] As a further improvement of the present invention: the guiding assembly includes a guide rod and a slider. The guide rod is disposed on the side of the rack, and the end of the guide rod is fixedly connected to the ammonia-containing wastewater storage tank and the top of the reaction tank through a support. The slider is fixedly disposed on the side wall of the rack and is slidably sleeved on the outside of the guide rod.

[0013] As a further improvement of the present invention: the slider is also connected to one of the sets of supports by an elastic element, which provides elastic support for the slider.

[0014] As a further improvement of the present invention: a wastewater inlet pipe is provided at the top of the ammonia-containing wastewater storage tank, a wastewater outlet pipe is provided at the bottom of the side wall of the ammonia-containing wastewater storage tank, and a valve is provided inside the wastewater outlet pipe; a dilute sulfuric acid inlet pipe is provided at the top of the reaction tank, a saturated ammonium sulfate solution outlet pipe is provided at the bottom of the side wall of the reaction tank, and a valve is provided inside the saturated ammonium sulfate solution outlet pipe.

[0015] Compared with the prior art, the beneficial effects of the present invention are: In this embodiment of the invention, when ammonia-containing wastewater needs to be treated, the ammonia-containing wastewater can be introduced into an ammonia-containing wastewater storage tank, and a fixed amount of dilute sulfuric acid solution can be introduced into a reaction tank. Then, the heating component is activated, and simultaneously, the driving component drives the stirring component to rotate, thus stirring the ammonia-containing wastewater in the storage tank and the dilute sulfuric acid solution in the reaction tank. When the stirring component rotates, the transmission component transmits its rotational power to the piston component, causing the piston component to reciprocate. This draws a fixed amount of ammonia gas released from the heated ammonia-containing wastewater in the storage tank into the fixed amount of dilute sulfuric acid solution in the reaction tank, where it reacts with the dilute sulfuric acid solution to generate ammonium sulfate solution. The ammonium sulfate solution is heated by the heating component at the bottom of the reaction tank, evaporating excess water, saturating the ammonium sulfate solution, and causing crystals to precipitate. Compared to existing technologies, this method automatically completes the mixing reaction of a fixed amount of ammonia gas and a fixed amount of dilute sulfuric acid solution when recovering and utilizing ammonia gas from ammonia-containing wastewater, thereby increasing the crystallization yield of ammonium sulfate. Attached Figure Description

[0016] Figure 1 A schematic diagram of a device for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater. Figure 1 ; Figure 2 A schematic diagram of a device for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater. Figure 2 ; Figure 3 A schematic diagram of a device for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater. Figure 3 ; Figure 4 A schematic diagram of a device for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater. Figure 4 ; Figure 5 for Figure 1 Enlarged view of region A in the middle; Figure 6 for Figure 2 Enlarged view of region B in the middle; Figure 7 for Figure 4 Enlarged diagram of region C in the middle; In the diagram: 10-Ammonia-containing wastewater storage tank, 101-Wastewater inlet pipe, 102-Wastewater outlet pipe, 103-Exhaust pipe, 20-Reaction tank, 201-Dilute sulfuric acid inlet pipe, 202-Saturated ammonium sulfate solution outlet pipe, 30-Stirring assembly, 301-Stirring rod, 302-Stirring crossbar, 303-Gas supply pipe, 304-Gas inlet, 40-Drive assembly, 401-Motor, 402-First gear, 403-Second gear, 404-Drive belt, 405-Pulley, 50-Transmission assembly, 501-Rack, 502-Third gear. 503-Support plate, 504-Rotating shaft, 505-Fourth gear, 506-Connecting cross plate, 507-Toggle lever, 508-Slide plate, 509-Slide rod, 510-Guide rod, 511-Slider, 512-Elastic element, 60-Piston assembly, 601-Gas storage box, 6011-First end face, 6012-Second end face, 602-Piston block, 603-First ammonia inlet pipe, 604-First ammonia outlet pipe, 605-Second ammonia outlet pipe, 606-Second ammonia inlet pipe, 607-Third ammonia outlet pipe, 608-First slide groove. Detailed Implementation

[0017] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] In the description of this invention, it should be understood that the terms "center", "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 invention 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 invention.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0021] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 This embodiment provides an ammonia-containing wastewater treatment and recovery ammonium sulfate crystallization device, including an ammonia-containing wastewater storage tank 10, a reaction tank 20, a stirring assembly 30, a driving assembly 40, a transmission assembly 50, and a piston assembly 60. The ammonia-containing wastewater storage tank 10 and the reaction tank 20 are placed side by side. Heating components are provided on the bottom inner sides of both the ammonia-containing wastewater storage tank 10 and the reaction tank 20. The stirring assembly 30 is disposed inside the ammonia-containing wastewater storage tank 10 and the reaction tank 20. The driving assembly 40 is installed on the top of the reaction tank 20 to drive the stirring assembly 30 to rotate, thereby controlling the ammonia-containing wastewater. The ammonia-containing wastewater inside the ammonia wastewater storage tank 10 and the dilute sulfuric acid solution inside the reaction tank 20 are stirred. The piston assembly 60 is disposed between the ammonia-containing wastewater storage tank 10 and the reaction tank 20. The transmission assembly 50 is disposed on the top of the reaction tank 20. When the drive assembly 40 drives the stirring assembly 30 to rotate, the transmission assembly 50 transmits the rotational power of the stirring assembly 30 to the piston assembly 60, causing the piston assembly 60 to reciprocate, thereby pumping a fixed amount of ammonia gas from the ammonia-containing wastewater storage tank 10 into a fixed amount of dilute sulfuric acid solution inside the reaction tank 20.

[0022] When ammonia-containing wastewater needs to be treated, the ammonia-containing wastewater can be introduced into the ammonia-containing wastewater storage tank 10, and a certain amount of dilute sulfuric acid solution can be introduced into the reaction tank 20. Then, the heating component is activated, and the driving component 40 drives the stirring component 30 to rotate, so as to stir the ammonia-containing wastewater in the ammonia-containing wastewater storage tank 10 and the dilute sulfuric acid solution in the reaction tank 20. When the stirring component 30 rotates, the transmission component 50 transmits its rotational power to the piston component 60, so that the piston component 60 moves back and forth, thereby drawing a certain amount of ammonia gas volatilized from the ammonia-containing wastewater in the ammonia-containing wastewater storage tank 10 into a certain amount of dilute sulfuric acid solution in the reaction tank 20, so as to react with the dilute sulfuric acid solution to generate ammonium sulfate solution. The ammonium sulfate solution is heated by the heating component at the bottom of the inner side of the reaction tank 20, thereby evaporating excess water, so that the ammonium sulfate solution is saturated and crystals precipitate.

[0023] Please see Figure 1 In one embodiment, the stirring assembly 30 includes two sets of stirring vertical rods 301. One set of stirring vertical rods 301 extends above the ammonia-containing wastewater storage tank 10 at its upper end and penetrates the top wall of the ammonia-containing wastewater storage tank 10 and extends into the interior of the ammonia-containing wastewater storage tank 10 at its lower end. The other set of stirring vertical rods 301 extends above the reaction tank 20 at its upper end and penetrates the top wall of the reaction tank 20 and extends into the interior of the reaction tank 20 at its lower end. Both sets of stirring vertical rods 301 are fixedly provided with a plurality of stirring horizontal rods 302 on the rods located inside the ammonia-containing wastewater storage tank 10 and the reaction tank 20.

[0024] The drive assembly 40 drives two sets of vertical stirring rods 301 to rotate, which in turn drives several horizontal stirring rods 302 to rotate, thereby stirring the ammonia-containing wastewater inside the ammonia-containing wastewater storage tank 10 and the dilute sulfuric acid solution inside the reaction tank 20. When the horizontal stirring rods 302 stir the ammonia-containing wastewater, they work in conjunction with heating to drive the ammonia gas in the ammonia-containing wastewater to evaporate quickly. When the stirring rods 302 stir the dilute sulfuric acid solution, they work in conjunction with heating to enable the dilute sulfuric acid solution to react quickly with the ammonia gas pumped into the dilute sulfuric acid solution to quickly generate ammonium sulfate.

[0025] Please see Figure 1 , Figure 2 , Figure 3 as well as Figure 4 In one embodiment, the drive assembly 40 includes a motor 401, a first gear 402, a second gear 403, a transmission belt 404, and pulleys 405. The motor 401 is fixedly mounted on the inner top wall of the reaction vessel 20. The first gear 402 is disposed at the output end of the motor 401. The second gear 403 is fixedly disposed outside the stirring rod 301 located on the reaction vessel 20. The second gear 403 meshes with the first gear 402. There are two sets of pulleys 405. The two sets of pulleys 405 are respectively fixedly disposed outside the two sets of stirring rods 301. The two sets of pulleys 405 are connected by the transmission belt 404.

[0026] The motor 401 drives the first gear 402 to rotate, and the meshing action of the first gear 402 and the second gear 403 drives the corresponding stirring rod 301 to rotate. When the stirring rod 301 rotates, it drives the corresponding pulley 405 to rotate. Through the transmission action of the transmission belt 404, it drives another set of pulleys 405 and another set of stirring rods 301 to rotate synchronously. When the two sets of stirring rods 301 rotate synchronously, they drive several stirring crossbars 302 on them to rotate, thereby stirring the ammonia-containing wastewater and the dilute sulfuric acid solution respectively.

[0027] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 as well as Figure 7 In one embodiment, the two sets of stirring rods 301 are hollow inside. The upper ends of the two sets of stirring rods 301 are connected to gas supply pipes 303 through rotary joints. An air inlet 304 is provided on the stirring rods 301 located in the reaction tank 20. The air inlet 304 is located in the inner area of ​​the reaction tank 20. The lower end of the stirring rods 301 located in the ammonia-containing wastewater storage tank 10 is rotatably connected to an exhaust pipe 103 through a rotary joint. The end of the exhaust pipe 103 away from the stirring rods 301 extends to the outside of the ammonia-containing wastewater storage tank 10.

[0028] When the heating component at the bottom of the inner side of the reaction tank 20 heats the dilute sulfuric acid solution, the generated steam enters the corresponding stirring rod 301 through the air inlet 304, then enters another set of stirring rods 301 through the gas inlet pipe 303, and finally exits through the exhaust pipe 103. During this process, the steam passes through the ammonia-containing wastewater inside the ammonia-containing wastewater storage tank 10, thereby assisting in the heating of the ammonia-containing wastewater, realizing the recovery and utilization of steam waste heat, and reducing the energy consumption required to heat the ammonia-containing wastewater.

[0029] Please see Figure 1 , Figure 2 as well as Figure 3 In one embodiment, the piston assembly 60 includes a gas storage tank 601, a piston block 602, a first ammonia inlet pipe 603, a first ammonia outlet pipe 604, a second ammonia outlet pipe 605, and a second ammonia inlet pipe 606. The gas storage tank 601 is fixedly disposed between the ammonia-containing wastewater storage tank 10 and the reaction tank 20. The piston block 602 is movably disposed inside the gas storage tank 601. The first end face 6011 of the gas storage tank 601 is connected to the ammonia-containing wastewater storage tank 10 through the first ammonia inlet pipe 603, and the second end face 6012 of the gas storage tank 601 is connected to the first ammonia outlet pipe 605 through the first ammonia outlet pipe 606. The gas outlet pipe 604 is connected to the reaction vessel 20. One end of the second ammonia outlet pipe 605 is connected to the reaction vessel 20, and the other end is connected to the cavity inside the gas storage tank 601 located between the piston block 602 and the first end face 6011. One end of the second ammonia inlet pipe 606 is connected to the reaction vessel 20, and the other end is connected to the cavity inside the gas storage tank 601 located between the piston block 602 and the second end face 6012. One-way valves are provided inside the first ammonia inlet pipe 603, the first ammonia outlet pipe 604, the second ammonia outlet pipe 605, and the second ammonia inlet pipe 606.

[0030] When the motor 401 drives the two sets of stirring rods 301 to rotate to stir the ammonia-containing wastewater and dilute sulfuric acid solution, the transmission assembly 50 transmits the rotational power of the stirring rods 301 to the piston block 602, causing the piston block 602 to reciprocate inside the gas storage tank 601. When the piston block 602 moves in one direction, the one-way valves inside the first ammonia inlet pipe 603 and the first ammonia outlet pipe 604 open, while the one-way valves inside the second ammonia outlet pipe 605 and the second ammonia inlet pipe 606 close. The piston block 602 draws the ammonia gas inside the ammonia-containing wastewater storage tank 10 through the first ammonia inlet pipe 603 into the cavity between the piston block 602 and the first end face 6011, and simultaneously pressurizes the ammonia gas in the cavity between the piston block 602 and the second end face 6012 through the first ammonia outlet pipe 604 to the reaction tank 20. Inside, when the piston block 602 moves in another direction, the one-way valves inside the first ammonia inlet pipe 603 and the first ammonia outlet pipe 604 are closed, while the one-way valves inside the second ammonia outlet pipe 605 and the second ammonia inlet pipe 606 are opened. The piston block 602 draws ammonia from inside the ammonia-containing wastewater storage tank 10 through the second ammonia inlet pipe 606 into the cavity between the piston block 602 and the second end face 6012. At the same time, it pressurizes the ammonia in the cavity between the piston block 602 and the first end face 6011 through the second ammonia outlet pipe 605 into the reaction tank 20. Therefore, as the piston block 602 reciprocates along the inside of the gas storage tank 601, a fixed amount of ammonia from inside the ammonia-containing wastewater storage tank 10 can be continuously drawn into the reaction tank 20, thereby achieving a continuous supply of ammonia and improving the reaction efficiency of ammonium sulfate.

[0031] Please see Figure 1 as well as Figure 5 In one embodiment, a first sliding groove 608 is provided on the side wall of the gas storage tank 601. The transmission assembly 50 includes a rack 501, a third gear 502, a support plate 503, a fourth gear 505, a connecting cross plate 506, a lever 507, a sliding plate 508, and a sliding rod 509. The support plate 503 is fixedly installed on the side wall of the gas storage tank 601. A rotating shaft 504 is rotatably disposed on the inner top wall of the support plate 503. The fourth gear 505 is fixedly disposed outside the rotating shaft 504. The upper part of one end of the connecting cross plate 506 is fixedly connected to the bottom of the rotating shaft 504, and the lower part of the other end is fixedly connected to the bottom of the rotating shaft 504. The part is fixedly connected to the lever 507. One end of the slide rod 509 is fixedly connected to the piston block 602, and the other end extends from the first slide groove 608 to the outside of the gas storage tank 601 and is connected to the slide plate 508. The upper part of the slide plate 508 is provided with a second slide groove. The lever 507 extends into the second slide groove. The third gear 501 is fixedly disposed outside the stirring vertical rod 301. The rack 502 is slidably disposed between the ammonia wastewater storage tank 10 and the reaction tank 20. The rack 502 meshes with the third gear 501 and the fourth gear 505.

[0032] When the stirring rod 301 rotates, it drives the third gear 501 to rotate synchronously. When the third gear 501 rotates, it drives the rack 502 to slide through meshing with the rack 502. When the rack 502 slides, it drives the rotating shaft 504, the connecting horizontal plate 506 and the lever 507 to rotate through meshing with the fourth gear 505. When the lever 507 rotates, it acts on the inner wall of the second slide groove, thereby actuating the slide plate 508 so that the slide plate 508 drives the slide rod 509 to move back and forth along the inside of the first slide groove 608. When the slide rod 509 moves back and forth, it drives the piston block 602 to move back and forth along the inside of the gas storage tank 601, thereby continuously pumping the ammonia gas inside the ammonia wastewater storage tank 10 to the inside of the reaction tank 20, so that the ammonia gas continuously reacts with the dilute sulfuric acid solution.

[0033] In one embodiment, a guide assembly is provided between the ammonia-containing wastewater storage tank 10 and the reaction tank 20. The guide assembly is used to guide the sliding of the rack 502, thereby ensuring that the rack 502 can smoothly mesh with the third gear 501 and the fourth gear 505 when sliding, and thus smoothly drive the piston block 602 to reciprocate along the inside of the gas storage tank 601.

[0034] Please see Figure 6 In one embodiment, the guiding assembly includes a guide rod 510 and a slider 511. The guide rod 510 is disposed on the side of the rack 502. The end of the guide rod 510 is fixedly connected to the top of the ammonia-containing wastewater storage tank 10 and the reaction tank 20 via a support. The slider 511 is fixedly disposed on the side wall of the rack 502 and is slidably sleeved on the outside of the guide rod 510.

[0035] When the third gear 501 meshes with the rack 502, the rack 502 can slide smoothly through the sliding engagement between the slider 511 and the guide rod 510.

[0036] Please see Figure 6 In one embodiment, the slider 511 is further connected to one of the sets of supports by an elastic element 512, which provides elastic support for the slider 511.

[0037] When the rack 502 slides and drives the slider 511 to slide along the outside of the guide rod 510, the elastic element 512 is compressed. As the third gear 501 meshes with the rack 502, the rack 502 drives the piston block 602 to move back and forth inside the gas storage tank 601. When the piston block 602 pumps a certain amount of ammonia into the reaction tank 20 to react with a certain amount of dilute sulfuric acid solution to generate ammonium sulfate, the rack 502 disengages from the third gear 501, and the elastic element 512 maintains its current compressed state. Subsequently, as the stirring vertical rod 301 and the third gear 501 continue to rotate, the stirring horizontal rod 302 stirs the dilute sulfuric acid solution, the rack 502 stops sliding, and the piston block 602 remains stationary, thereby stopping the continued supply of ammonia into the reaction tank 20, thus avoiding too much or too little ammonia reacting with the dilute sulfuric acid solution, thereby improving the ammonium sulfate generation effect.

[0038] In one embodiment, the elastic element 512 can be a spring or a metal sheet, and there is no limitation on this.

[0039] Please see Figure 1 In one embodiment, the ammonia-containing wastewater storage tank 10 is provided with a wastewater inlet pipe 101 at the top and a wastewater outlet pipe 102 at the bottom of the side wall of the ammonia-containing wastewater storage tank 10, with a valve inside the wastewater outlet pipe 102. The reaction tank 20 is provided with a dilute sulfuric acid inlet pipe 201 at the top and a saturated ammonium sulfate solution outlet pipe 202 at the bottom of the side wall of the reaction tank 20, with a valve inside the saturated ammonium sulfate solution outlet pipe 202.

[0040] When ammonia reacts with dilute sulfuric acid solution and is heated by the heating element to generate a saturated ammonium sulfate solution, the operator opens the valve in the saturated ammonium sulfate solution outlet pipe 202 to discharge the saturated ammonium sulfate solution and the absorbed crystals. Then, the solution is centrifuged to separate the ammonium sulfate crystals. When the ammonia-containing wastewater in the ammonia-containing wastewater storage tank 10 is used up, the operator can open the valve in the wastewater outlet pipe 102 to discharge the wastewater.

[0041] In one embodiment, the heating component may be an electric heating plate or other structures with heating functions, without limitation.

[0042] In this embodiment of the invention, when ammonia-containing wastewater needs to be treated, the ammonia-containing wastewater can be introduced into the ammonia-containing wastewater storage tank 10, and a measured amount of dilute sulfuric acid solution can be introduced into the reaction tank 20. Then, the heating component is activated, and simultaneously, the driving component 40 drives the stirring component 30 to rotate, thereby stirring the ammonia-containing wastewater inside the ammonia-containing wastewater storage tank 10 and the dilute sulfuric acid solution inside the reaction tank 20. When the stirring component 30 rotates, the transmission component 50 transmits its rotational power to the piston assembly 60, causing the piston assembly 60 to reciprocate. A fixed amount of ammonia gas released from the heated ammonia-containing wastewater in the storage tank 10 is pumped to a fixed amount of dilute sulfuric acid solution inside the reaction tank 20, where it reacts with the dilute sulfuric acid solution to generate ammonium sulfate solution. The ammonium sulfate solution is heated by a heating element at the bottom of the inner side of the reaction tank 20, thereby evaporating excess water, saturating the ammonium sulfate solution, and causing crystals to precipitate. Compared with existing technologies, when recovering and utilizing ammonia gas from ammonia-containing wastewater, the mixing reaction of a fixed amount of ammonia gas and a fixed amount of dilute sulfuric acid solution can be automatically completed, thereby increasing the crystallization yield of ammonium sulfate.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A device for treating and recovering ammonium sulfate crystals from ammonia-containing wastewater, characterized in that, This includes ammonia-containing wastewater storage tanks, reaction tanks, stirring components, drive components, transmission components, and piston components. The ammonia-containing wastewater storage tank and the reaction tank are placed side by side, and both the ammonia-containing wastewater storage tank and the reaction tank are equipped with heating components at their inner bottom. The stirring assembly is installed inside the ammonia-containing wastewater storage tank and the reaction tank. The drive assembly is installed on the top of the reaction tank and is used to drive the stirring assembly to rotate, thereby stirring the ammonia-containing wastewater inside the ammonia-containing wastewater storage tank and the dilute sulfuric acid solution inside the reaction tank. The piston assembly is disposed between the ammonia-containing wastewater storage tank and the reaction tank, and the transmission assembly is disposed at the top of the reaction tank. When the drive assembly drives the stirring assembly to rotate, the transmission assembly transmits the rotational power of the stirring assembly to the piston assembly, causing the piston assembly to reciprocate, thereby pumping a fixed amount of ammonia gas from inside the ammonia-containing wastewater storage tank to a fixed amount of dilute sulfuric acid solution inside the reaction tank.

2. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 1, characterized in that, The stirring assembly includes two sets of stirring rods. One set of stirring vertical rods extends from the top of the ammonia-containing wastewater storage tank to the bottom, and the bottom of the stirring vertical rods penetrates the top wall of the ammonia-containing wastewater storage tank and extends into the interior of the ammonia-containing wastewater storage tank. The other set of stirring vertical rods extends from the top of the reaction tank to the bottom, and the bottom of the stirring vertical rods penetrates the top wall of the reaction tank and extends into the interior of the reaction tank. Several stirring horizontal rods are fixedly installed on the rods of both sets of stirring vertical rods located inside the ammonia-containing wastewater storage tank and the reaction tank.

3. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 2, characterized in that, The drive assembly includes a motor, a first gear, a second gear, a transmission belt, and pulleys. The motor is fixedly installed on the inner top wall of the reaction vessel. The first gear is located at the output end of the motor. The second gear is fixedly located outside the stirring rod on the reaction vessel. The second gear meshes with the first gear. There are two sets of pulleys. The two sets of pulleys are respectively fixedly located outside the two sets of stirring rods. The two sets of pulleys are connected by the transmission belt.

4. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 2, characterized in that, Both sets of stirring rods are hollow inside, and the upper ends of both sets of stirring rods are connected to gas supply pipes via rotary joints. An air inlet is provided on the stirring rod of the reaction vessel, and the air inlet is located in the inner area of ​​the reaction vessel. The lower end of the stirring rod located on the ammonia-containing wastewater storage tank is rotatably connected to an exhaust pipe via a rotary joint, and the end of the exhaust pipe away from the stirring rod extends to the outside of the ammonia-containing wastewater storage tank.

5. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 2, characterized in that, The piston assembly includes a gas storage tank, a piston block, a first ammonia inlet pipe, a first ammonia outlet pipe, a second ammonia outlet pipe, and a second ammonia inlet pipe. The gas storage tank is fixedly disposed between the ammonia-containing wastewater storage tank and the reaction tank. The piston block is movably disposed inside the gas storage tank. The first end face of the gas storage tank is connected to the ammonia-containing wastewater storage tank through the first ammonia inlet pipe, and the second end face of the gas storage tank is connected to the reaction tank through the first ammonia outlet pipe. One end of the second ammonia outlet pipe is connected to the reaction vessel, and the other end is connected to the cavity inside the gas storage tank located between the piston block and the first end face. One end of the second ammonia inlet pipe is connected to the reaction vessel, and the other end is connected to the cavity inside the gas tank located between the piston block and the second end face. One-way valves are installed inside the first ammonia inlet pipe, the first ammonia outlet pipe, the second ammonia outlet pipe, and the second ammonia inlet pipe.

6. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 5, characterized in that, A first sliding groove is provided on the side wall of the gas storage tank. The transmission assembly includes a rack, a third gear, a support plate, a fourth gear, a connecting cross plate, a lever, a sliding plate, and a slide bar. The support plate is fixedly installed on the side wall of the gas storage tank. A rotating shaft is rotatably mounted on the inner top wall of the support plate. The fourth gear is fixedly mounted outside the rotating shaft. The upper part of one end of the connecting cross plate is fixedly connected to the bottom of the rotating shaft, and the lower part of the other end is fixedly connected to the lever. One end of the slide rod is fixedly connected to the piston block, and the other end extends from the first slide groove to the outside of the gas storage tank and is connected to the slide plate. A second slide groove is provided on the upper part of the slide plate, and the lever extends into the second slide groove. The third gear is fixedly installed outside the stirring vertical rod, and the rack is slidably installed between the ammonia-containing wastewater storage tank and the reaction tank. The rack meshes with the third gear and the fourth gear.

7. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 6, characterized in that, A guide assembly is also provided between the ammonia-containing wastewater storage tank and the reaction tank, the guide assembly being used to guide the sliding of the rack.

8. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 7, characterized in that, The guiding assembly includes a guide rod and a slider. The guide rod is disposed on the side of the rack, and the end of the guide rod is fixedly connected to the ammonia-containing wastewater storage tank and the top of the reaction tank through a support. The slider is fixedly disposed on the side wall of the rack and is slidably sleeved on the outside of the guide rod.

9. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 8, characterized in that, The slider is also connected to one of the sets of supports by an elastic element, which provides elastic support to the slider.

10. The ammonium sulfate crystallization device for treating and recovering ammonia-containing wastewater according to claim 1, characterized in that, The ammonia-containing wastewater storage tank is equipped with a wastewater inlet pipe at the top and a wastewater outlet pipe at the bottom of the side wall of the ammonia-containing wastewater storage tank. A valve is installed inside the wastewater outlet pipe. The reaction tank is equipped with a dilute sulfuric acid inlet pipe at the top and a saturated ammonium sulfate solution outlet pipe at the bottom of the side wall of the reaction tank. A valve is installed inside the saturated ammonium sulfate solution outlet pipe.

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