Ammonia-containing tail gas treatment device of evaporative crystallization system and evaporative crystallization system

Abstract

The utility model relates to the technical field of ammonia-containing tail gas treatment, and particularly discloses an ammonia-containing tail gas treatment device of an evaporative crystallization system and the evaporative crystallization system. The device comprises a reaction kettle and an anti-backflow gas guide mechanism, the reaction kettle is provided with a liquid inlet, and the liquid inlet is configured to allow a hydrogen peroxide solution to be added into the reaction kettle; the anti-backflow gas guide mechanism is configured to guide the ammonia-containing tail gas into the hydrogen peroxide solution in the reaction kettle for reaction and prevent the hydrogen peroxide solution from flowing back in the direction opposite to the guide direction of the ammonia-containing tail gas. The reaction kettle is further provided with an exhaust port, and the exhaust port is configured to exhaust gas in the reaction kettle. According to the device, ammonia-containing tail gas is guided into a hydrogen peroxide solution in the reaction kettle by utilizing the anti-backflow gas guide mechanism, the ammonia-containing tail gas and the hydrogen peroxide solution are subjected to chemical reaction to generate harmless gas nitrogen and water, finally, gas in the reaction kettle is discharged through the exhaust port, and the water and the hydrogen peroxide solution are mixed and stored in the reaction kettle, so that the ammonia content of the tail gas is reduced; the influence of tail gas on the environment is reduced and the health degree of operators is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia-containing tail gas treatment, and in particular to an ammonia-containing tail gas treatment device of an evaporation crystallization system and an evaporation crystallization system. Background Art

[0002] The evaporation and crystallization system is used to produce sodium chloride, sodium sulfate, miscellaneous salts, etc. Since the front-end section has not installed the process of removing ammonium ions, the ammonium ions are converted into ammonia gas during the back-end evaporation and crystallization process. The ammonia gas is discharged to the outside along with the exhaust gas, making the entire evaporation and crystallization workshop have a strong pungent odor, which damages the physical and mental health of the workers. Utility Model Content

[0003] In order to solve the technical problems existing in the prior art, the present disclosure provides an ammonia-containing tail gas treatment device of an evaporation crystallization system and an ammonia-containing tail gas treatment device.

[0004] In a first aspect, the present disclosure provides an ammonia-containing tail gas treatment device for an evaporation crystallization system, the ammonia-containing tail gas treatment device comprising:

[0005] A reactor having a liquid inlet configured to allow the addition of a hydrogen peroxide solution into the reactor;

[0006] an anti-backflow gas guiding mechanism, wherein the anti-backflow gas guiding mechanism is configured to guide the ammonia-containing tail gas into the hydrogen peroxide solution in the reactor and prevent the hydrogen peroxide solution in the reactor from flowing back in the direction opposite to the input direction of the ammonia-containing tail gas;

[0007] The reactor further has an exhaust port, which is configured to allow the gas to be discharged from the reactor, wherein the gas includes an incompletely reacted ammonia-containing tail gas and nitrogen generated after the reaction.

[0008] In one embodiment, the anti-backflow air guiding mechanism comprises:

[0009] Airway;

[0010] An air-guiding shell, which is arranged in the reaction kettle and below the liquid inlet, and has a hollow cavity and is provided with a plurality of vent holes connected with the hollow cavity;

[0011] A water baffle, the water baffle is rotatably disposed in the air guide shell and is located below the plurality of air vents, the other end of the air guide pipe is inserted into the reactor and communicates with the hollow cavity of the air guide shell below the water baffle;

[0012] The water baffle is in an initial position under the action of its own weight, and when in the initial position, the water baffle disconnects the air guide pipe and the vent hole;

[0013] When the pressure of the ammonia tail gas in the air duct is greater than the deadweight of the water baffle and the pressure applied by the hydrogen peroxide solution, the water baffle rotates upward around its own rotation axis from the initial position to connect the vent hole and the air duct.

[0014] In one embodiment, the anti-backflow air guide mechanism includes two water baffles, and the two water baffles share the same rotating shaft and are rotatably axially symmetrically arranged in the air guide shell.

[0015] In one embodiment, a stop ring is further provided on the inner wall of the air guide housing, and the water baffle plate located at the initial position abuts against the stop ring.

[0016] In one embodiment, a first control valve is provided on the air guide pipe, and the first control valve is configured to allow the ammonia-containing tail gas to flow from the air guide pipe to the air guide shell, while preventing the hydrogen peroxide solution in the reactor from flowing back from the air guide pipe.

[0017] In one embodiment, the ammonia-containing tail gas treatment device includes at least two stages of reactors arranged in sequence, each stage of the reactor is provided with the anti-backflow gas guiding mechanism, and the anti-backflow gas guiding mechanism of the reactor of the latter stage introduces the gas discharged from the reactor of the previous stage into the reactor of the latter stage for continued reaction.

[0018] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0019] A gas recovery device is configured to detect the ammonia concentration in the gas discharged from the last stage of the reactor, store the gas that meets the preset storage concentration requirements, and directly discharge the gas that does not meet the preset storage concentration requirements into the atmosphere.

[0020] In one embodiment, the gas recovery device comprises:

[0021] A gas concentration detection element, wherein the gas concentration detection element is configured to detect the concentration of ammonia in the gas discharged from the last stage of the reactor;

[0022] A control valve, wherein the control valve is configured to connect the exhaust port and the atmosphere when the ammonia concentration in the gas discharged from the last stage reactor exceeds the preset recovery concentration; and to connect the exhaust port and the gas storage tank when the ammonia concentration in the gas discharged from the last stage reactor does not exceed the preset recovery concentration, so as to guide the discharged gas into the gas storage tank for storage.

[0023] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0024] A liquid recovery mechanism is configured to introduce the liquid generated in the reactor into the regulating tank.

[0025] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0026] A detection element, wherein the detection element is configured to detect working parameters in the reactor, wherein the working parameters include a liquid level in the reactor and / or a pressure in the reactor;

[0027] an alarm element, the alarm element being in communication with the detection element and sounding an alarm when an operating parameter exceeds a preset parameter; and / or,

[0028] A control element is communicatively connected with the alarm element and is configured to control the reactor to shut down after receiving an alarm.

[0029] In a second aspect, the present disclosure provides an evaporation crystallization system, which includes an evaporation crystallization device and an ammonia-containing tail gas treatment device as described in any of the above embodiments, wherein the evaporation crystallization device is configured to treat crystalline salt by-products produced after treating wastewater, and the ammonia-containing tail gas treatment device is used to treat the ammonia-containing tail gas produced by the evaporation crystallization device treating wastewater.

[0030] One of the beneficial effects of the ammonia-containing tail gas treatment device of the evaporation crystallization system disclosed in the present invention is that the ammonia-containing tail gas treatment device disclosed in the present invention uses an anti-backflow gas guide mechanism to guide the ammonia-containing tail gas into the hydrogen peroxide solution in the reactor, and the two react chemically to generate harmless gases nitrogen and water, and finally the gas in the reactor is discharged from the exhaust port, while the water is mixed with the hydrogen peroxide solution and stored in the reactor. Obviously, the ammonia content of the tail gas of the evaporation crystallization device is reduced after being treated by the ammonia-containing tail gas treatment device disclosed in the present invention, the impact of the tail gas on the environment is reduced, and the health of the operators is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0032] Figure 1 is a schematic structural diagram of an ammonia-containing tail gas treatment device disclosed in an embodiment;

[0033] Figure 2 The figure is a schematic diagram of the structure of the anti-backflow air guide mechanism disclosed in an embodiment.

[0034] Figure 1 and Figure 2 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0035] Reactor: 10: reactor body; 11: stirring blade; 12: driving mechanism; 13: liquid level detection element; 14: pressure detection element;

[0036] Anti-backflow air guide mechanism: 20 air guide pipe; 21 air guide shell; 210 air vent; 22 water baffle; 23 rotating shaft; 24 stop ring; 25 first control valve;

[0037] Gas recovery mechanism: 30 gas concentration detection element; 31 main exhaust pipe; 32 first exhaust pipe; 33 second exhaust pipe; 34 drying mechanism; 35 compressor; 36 nitrogen storage tank; 37 first switch valve; 38 second switch valve; 39 third switch valve;

[0038] Liquid recovery mechanism: 40 main liquid discharge pipe; 41 pump. DETAILED DESCRIPTION

[0039] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure unless otherwise specifically stated.

[0040] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0041] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0042] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0043] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] See also Figure 1 In one embodiment, the ammonia-containing tail gas treatment device of the evaporation crystallization system disclosed in the present invention includes a reactor and an anti-backflow gas guide mechanism. The reactor has a liquid inlet, which is configured to allow the addition of a hydrogen peroxide solution into the reactor; the anti-backflow gas guide mechanism is configured to introduce the ammonia-containing tail gas into the hydrogen peroxide solution in the reactor for reaction, and prevent the hydrogen peroxide solution from flowing back in the opposite direction of the input direction of the ammonia-containing tail gas. The reactor also has an exhaust port, which is configured to exhaust the gas from the reactor, the gas including the ammonia-containing tail gas that has not been completely reacted and the nitrogen generated after the reaction.

[0045] The working process of the ammonia-containing tail gas treatment device disclosed in the present invention is: adding a hydrogen peroxide solution into a reactor, then introducing the ammonia-containing tail gas into the hydrogen peroxide solution in the reactor through an anti-backflow gas guide mechanism to react, and at the same time, preventing the hydrogen peroxide solution from flowing back in the direction opposite to the introduction direction of the ammonia-containing tail gas, and after the ammonia-containing tail gas and the hydrogen peroxide solution undergo a chemical reaction according to formula (1) to generate nitrogen and water, the gas in the reactor is discharged.

[0046] 2NH3+3H2O2→N2+6H2O formula (1)

[0047] Among them, NH3 is the chemical formula of ammonia, H2O2 is the chemical formula of hydrogen peroxide solution, N2 is the chemical formula of nitrogen, and H2O is the chemical formula of water.

[0048] The ammonia-containing tail gas treatment device disclosed in the present invention uses an anti-backflow gas guide mechanism to guide the ammonia-containing tail gas into the hydrogen peroxide solution in the reactor, and the two react chemically to generate harmless gases nitrogen and water, and finally the gas in the reactor is discharged from the exhaust port, while the water is mixed with the hydrogen peroxide solution and stored in the reactor. Obviously, the ammonia content of the tail gas of the evaporation crystallization device is reduced after being treated by the ammonia-containing tail gas treatment device disclosed in the present invention, thereby reducing the impact of the tail gas on the environment and improving the health of the operators.

[0049] For details, see Figure 1 In one embodiment, the reactor of the present disclosure includes a reactor body 10, which may be a hollow closed box structure with a cross-sectional shape of a circle, a square, an ellipse, etc. The reactor body 10 is provided with a liquid inlet, an air inlet, and an exhaust port, wherein the liquid inlet is provided on the valve body top cover, and the hydrogen peroxide solution is added into the reactor body 10 through the liquid inlet, and the air inlet and the exhaust port are both provided on the side wall of the reactor body 10, and the air inlet and the exhaust port are both located below the liquid inlet in the height direction. The material of the reactor body 10 is based on the conditions for the chemical reaction between ammonia and hydrogen peroxide solution, for example, the material of the reactor body 10 has corrosion resistance and pressure resistance.

[0050] Combination Figure 1 and Figure 2 The anti-backflow air guide mechanism includes an air guide pipe 20, an air guide shell 21 and a water baffle 22, wherein one port of the air guide pipe 20 is used to input the ammonia-containing tail gas generated by the evaporation crystallization device, that is, it is connected to the tail gas exhaust port of the evaporation crystallization device. The air guide shell 21 is arranged in the reactor and is located below the liquid inlet. The air guide shell 21 has a hollow cavity, and the air guide shell 21 is provided with a plurality of vents 210 connected to the hollow cavity.

[0051] The water baffle 22 is rotatably arranged in the air guide shell 21 and is located below the plurality of vents 210. The other end of the air guide pipe 20 is inserted into the reactor and communicated with the hollow cavity of the air guide shell 21 below the water baffle 22. The water baffle 22 is in the initial position under the action of its own weight. When in the initial position, the water baffle 22 disconnects the air guide pipe 20 and the vents 210, that is, when in the initial position, there is basically zero clearance between the water baffle 22 and the inner wall of the air guide shell 21. The water baffle 22 isolates the air guide shell 21 into an upper chamber and a lower chamber that are independent of each other. The upper chamber is communicated with the plurality of vents 210, and the lower chamber is communicated with the air guide pipe 20. At this time, even if there is tail gas containing ammonia in the air guide pipe 20, it cannot enter the reactor, and of course, the hydrogen peroxide solution in the reactor will not flow back from the reactor into the air guide pipe 20.

[0052] When the pressure of the ammonia tail gas in the air guide pipe 20 is greater than the deadweight of the water baffle 22 and the pressure applied by the hydrogen peroxide solution on the water baffle 22, the water baffle 22 rotates upward from the initial position around its own rotation axis, and at the same time, a gap is generated between the water baffle 22 and the inner wall of the air guide shell 21 and gradually increases until the force on the water baffle 22 reaches a balance again. In other words, the air guide pipe 20 is connected with a plurality of gaps between the water baffle 22 and the inner wall of the air guide shell 21, and the ammonia tail gas in the air guide shell 21 sequentially passes through the gap and a plurality of vents 210 into the hydrogen peroxide solution in the reactor, until the ammonia tail gas stops being introduced into the air guide pipe 20 or the pressure of the ammonia tail gas is less than the deadweight of the water baffle 22 and the pressure of the hydrogen peroxide solution, the water baffle 22 rotates downward around its own rotation axis until it abuts against the inner wall of the air guide shell 21 until the gap between the two is zero, that is, it returns to the initial position.

[0053] Obviously, the anti-backflow gas guiding mechanism disclosed in the present invention utilizes a simple structure to cleverly achieve the goal of allowing the ammonia-containing tail gas to be normally introduced into the hydrogen peroxide solution in the reactor, ensuring repeated mixing and contact between the two to produce a relatively sufficient chemical reaction, while also preventing the problem of hydrogen peroxide solution backflowing into the gas guiding pipe 20 through the vent hole 210.

[0054] Further, in one embodiment, the anti-backflow air guide device of the present disclosure includes two water baffles 22, and the two water baffles 22 share the same rotating shaft 23 and are rotatably axially symmetrically arranged in the air guide shell 21. It can be understood that the shape of the two water baffles 22 after splicing matches the shape of the cross section inside the air guide shell 21, that is, when located in the initial position, there is basically zero gap between the two water baffles 22 and the inner wall of the air guide shell 21.

[0055] When the pressure of the ammonia-containing tail gas in the air guide pipe 20 is greater than the dead weight of the two water baffles 22 and the pressure applied to the two water baffles 22 by the hydrogen peroxide solution, the two water baffles 22 rotate upward around their own rotation axes from the initial positions. At the same time, a gap is generated between the water baffles 22 and the inner wall of the air guide shell 21 and gradually increases until the forces on the two water baffles 22 are balanced again.

[0056] The rotating shaft 23 is located directly above the air guide pipe 20 . With this arrangement, when the tail gas containing ammonia is introduced into the air guide housing 21 , the water baffles 22 on both sides of the rotating shaft 23 are subjected to balanced force, and both rotate upward around the rotating shaft 23 smoothly.

[0057] Further, see Figure 2 A stop ring 24 is also provided on the inner wall of the air guide housing 21 , and the water baffle plate 22 located at the initial position abuts against the stop ring 24 .

[0058] It can be understood that the anti-backflow air guiding mechanism disclosed in the present invention limits the downward rotation angle of the water baffle plate 22 under its own weight and the pressure of the hydrogen peroxide solution through the stop ring 24, and in the initial position, the water baffle plate 22 forms a zero-gap fitting relationship with the inner wall of the air guide shell 21 through the stop ring 24, thereby avoiding the water baffle plate 22 from scratching the inner wall of the air guide shell 21 during rotation when the water baffle plate 22 and the inner wall of the air guide shell 21 are in contact and fit, thereby extending the service life of the anti-backflow air guiding mechanism to a certain extent.

[0059] Furthermore, a first control valve 25 is provided on the air duct 20 , and the first control valve 25 is configured to allow the ammonia-containing tail gas to flow from the air duct 20 to the air duct housing 21 , while preventing the hydrogen peroxide solution in the air duct housing 21 from flowing back from the air duct 20 .

[0060] It can be understood that when the water retaining plate 22 fails due to structural damage or other faults, the first control valve 25 can prevent the hydrogen peroxide solution from flowing back, thus playing an emergency protection role. The first control valve 25 can be a one-way valve, which allows the ammonia-containing tail gas to flow along the conduit toward the air guide shell 21 and prevents the hydrogen peroxide solution from flowing back along the air guide pipe 20. Of course, in other embodiments, the first control valve 25 can also be a switch valve, and its driving mode can be manual or electromagnetic.

[0061] Further, see Figure 1 After adding hydrogen peroxide solution to the preset liquid level through the liquid inlet, ammonia-containing tail gas is introduced into the hydrogen peroxide solution through the anti-backflow gas guide mechanism to allow the two to undergo a chemical reaction in the reactor.

[0062] In order to make the chemical reaction between the two more complete, the ammonia-containing tail gas treatment device also includes a stirring blade 11 and a driving mechanism 12 for driving the stirring blade 11 to rotate. During the rotation of the stirring blade 11, the hydrogen peroxide solution and the ammonia-containing tail gas can be promoted to mix more evenly, thereby making the chemical reaction between the two more complete.

[0063] Continue to see Figure 1 In one embodiment, the ammonia-containing tail gas treatment device disclosed in the present invention includes three-stage reactors arranged in sequence, each stage reactor is provided with an anti-backflow gas guide mechanism, and the exhaust port and the air inlet between two adjacent stages of reactors are connected through the anti-backflow gas guide mechanism in the latter stage reactor.

[0064] With such an arrangement, when the ammonia-containing tail gas treatment device of the present invention is working, the ammonia-containing tail gas is first introduced into the primary reactor to chemically react with the hydrogen peroxide solution therein, the reaction gas after the reaction and the ammonia-containing tail gas that has not yet reacted fully are introduced into the secondary reactor via the anti-backflow gas guiding mechanism of the secondary reactor, and continue to chemically react with the hydrogen peroxide solution in the secondary reactor, the reaction gas after the reaction and the ammonia-containing tail gas that has not yet reacted repeatedly are introduced into the tertiary reactor via the anti-backflow gas guiding mechanism of the tertiary reactor to continue to react, and finally the reaction gas and a small amount of ammonia-containing tail gas mixed therewith are discharged from the exhaust port of the tertiary reactor.

[0065] Obviously, the ammonia-containing tail gas treatment device disclosed in the present invention uses a three-stage reactor to perform multi-stage ammonia removal treatment on the ammonia-containing tail gas, thereby improving the ammonia removal efficiency and controlling the amount of harmful ammonia in the discharged reaction gas to the minimum content, thereby avoiding the pollution of ammonia to the environment to the greatest extent.

[0066] Of course, the number of reactors in the ammonia-containing tail gas treatment device disclosed herein can be an integer different from three, such as two or four. The more reactors there are, the more complete the reaction between the hydrogen peroxide solution and the ammonia-containing tail gas, and the better the ammonia removal effect, but the cost of the ammonia-containing tail gas treatment device will also increase accordingly. Therefore, those skilled in the art can select an appropriate number of reactors based on ammonia removal efficiency and cost control considerations.

[0067] That is to say, the ammonia-containing tail gas treatment device disclosed in the present invention includes at least two stages of reactors arranged in sequence, each stage of the reactor is provided with an anti-backflow gas guiding mechanism, and the anti-backflow gas guiding mechanism of the rear stage reactor guides the exhaust gas of the previous stage reactor into the rear stage reactor for continued reaction.

[0068] Continue to see Figure 1 The ammonia-containing tail gas treatment device disclosed in the present invention also includes a gas recovery device, which is configured to detect the ammonia concentration in the gas discharged from the last stage reactor, and store the reaction gas that meets the preset storage concentration requirements, and directly discharge the gas that does not meet the preset storage concentration requirements into the atmosphere.

[0069] It should be noted that the preset storage concentration mentioned herein refers to the ammonia content in the post-reaction gas, which is usually set to the preset storage concentration value of ammonia in the post-reaction gas. If the ammonia concentration in the post-reaction gas is greater than the preset storage concentration value of ammonia, it means that the conditions for storing the post-reaction gas are not met. On the contrary, if the ammonia concentration in the post-reaction gas is less than or equal to the preset storage concentration value of ammonia, it means that the conditions for storing the post-reaction gas are met. This limitation is mainly to consider the recycling of nitrogen in the post-reaction gas. If the ammonia concentration in the nitrogen is too high (preset storage concentration value), it means that even if these nitrogen are recycled and stored, they do not meet the use requirements, so they are directly discharged into the atmosphere. Although the ammonia content exceeds the preset storage concentration requirement, its concentration meets the emission standards and will not cause pollution to the atmosphere.

[0070] For details, see Figure 1 The gas recovery device includes a gas concentration detection element 30, a second control valve and a nitrogen storage tank 36, wherein the gas concentration detection element 30 is configured to detect the concentration of ammonia in the gas discharged from the last-stage reactor; the control valve is configured to connect the exhaust port and the atmosphere when the ammonia concentration in the gas discharged from the last-stage reactor exceeds the preset recovery concentration; when the ammonia concentration in the gas discharged from the last-stage reactor does not exceed the preset recovery concentration, the exhaust port and the nitrogen storage tank 36 are connected to guide the discharged gas into the nitrogen storage tank 36 for storage.

[0071] In detail, the second control valve includes a first switch valve 37, a second switch valve 38 and a third switch valve 39, wherein the first switch valve 37 is arranged on the main exhaust pipe 31 connected to the exhaust port, the second switch valve 38 and the third switch are arranged on the first branch exhaust pipe 32 and the second branch exhaust pipe 33 respectively, and the first branch exhaust pipe 32 and the second branch exhaust pipe 33 are connected in parallel and then in series with the main exhaust pipe 31, the first branch exhaust pipe 32 is directly connected to the atmosphere, and the second branch exhaust pipe 33 is connected to the nitrogen storage tank 36. It can be understood that the purpose of connecting the exhaust port and the atmosphere or the nitrogen storage tank 36 can be achieved by controlling the first switch valve 37, the second switch valve 38 and the third switch valve 39.

[0072] Of course, in order to further improve the quality of the recovered gas, the gas recovery device disclosed in the present invention also includes a drying mechanism 34 and a compressor 35 which are sequentially arranged on the second exhaust pipe 33, wherein the drying mechanism 34 is configured to dry the exhaust gas from the last stage reactor and introduce it into the compressor 35, and the compressor 35 is used to compress the dried gas and send it into the nitrogen storage tank 36.

[0073] Continue to see Figure 1In one embodiment, the ammonia-containing tail gas treatment device of the present disclosure further includes a liquid recovery mechanism, which is configured to introduce the liquid generated in the reactor into the regulating tank.

[0074] In detail, the liquid recovery mechanism further includes a main drain pipe 40 connecting the reactor and the regulating tank, and a pump 41 arranged on the main drain pipe 40 to pump the liquid in the reactor into the regulating tank.

[0075] When the number of reactors is greater than one, based on the number of reactors, the liquid recovery mechanism further includes branch drainage pipes which are the same in number as the number of reactors and are arranged in parallel with each other, and the branch drainage pipes in parallel with each other are respectively connected to the corresponding reactors and drainage pipes.

[0076] In addition, in one embodiment, the ammonia-containing tail gas treatment device of the present disclosure further includes a detection element and an alarm element, wherein the detection element is configured to detect the working parameters in each reactor, the working parameters including the liquid level in the reactor and / or the pressure in the reactor, and the alarm element is connected to the detection element in communication, and an alarm is issued when the working parameter exceeds the preset parameter. The detection element may include an ammonia concentration detection element, a pressure detection element 14, and a liquid level detection element 13. The alarm element may be a sound alarm, a light alarm, or a sound and light combination alarm.

[0077] Of course, in one embodiment, the ammonia-containing tail gas treatment device of the present disclosure further includes a control element, which is communicatively connected to the alarm element and is configured to control the reactor to shut down after receiving an alarm.

[0078] In summary, the ammonia-containing tail gas treatment device disclosed in the present invention can realize the intelligent reaction process, so that the accuracy and precision of the whole process can be controlled. No harmful pollutants are produced in the whole treatment process, only nitrogen and water are produced, and the nitrogen and water produced are recovered and recycled to reduce production costs. For the treatment of substandard nitrogen, since the ammonia content is very low, it can be directly discharged to the outside world without any negative impact on the environment.

[0079] For ease of understanding, refer to Figure 1 , combined with an application scenario to explain in detail the specific working process of the ammonia-containing tail gas treatment device disclosed in the present invention.

[0080] First, the first-stage reactor, the second-stage reactor and the third-stage reactor are filled with hydrogen peroxide solution respectively, and the liquid level of the hydrogen peroxide solution is monitored in real time by the liquid level detection element 13 to prevent overflow into the ventilation and backflow prevention device.

[0081] The ammonia-containing tail gas generated by the evaporation crystallization device enters the primary reactor through the air duct 20, and reacts with the hydrogen peroxide solution in the reactor body 10. The ammonia concentration detection element at the air inlet can monitor the ammonia concentration of the tail gas in real time. The gas generated after the reaction enters the secondary reactor through the air duct 20 for reaction, and the gas generated by the reaction enters the tertiary reactor through the air duct 20 for reaction.

[0082] After the stirring is completed, the gas finally generated is detected by the gas concentration detection element 30 at the exhaust pipe. If it meets the standard, it can be dried and compressed by the drying mechanism 34 and the compression device, and then enter the nitrogen storage tank for storage and reuse; the gas that does not meet the standard can be directly discharged because the ammonia concentration has been greatly reduced at this time.

[0083] The liquid finally produced by the reaction in the three-stage reactor is mainly water, which can flow from the respective branch drain pipes into the main drain pipe through the action of pump 41, and finally enter the regulating tank for reuse, ensuring that no harmful substances are produced in the whole process. The replacement frequency of hydrogen peroxide in the first-stage reactor is higher, and the replacement frequency of the second and third stages is lower. During the reaction process, the control element controls and monitors the working parameters such as the liquid level, pressure and ammonia concentration in the reactor in real time through various detection elements. If there is an abnormality, an alarm will be immediately issued and emergency stop measures will be automatically taken to ensure the controllability and safety of the whole reaction process.

[0084] In addition to the above-mentioned ammonia-containing tail gas treatment device, the present disclosure also provides an evaporation crystallization system, which includes an evaporation crystallization device and an ammonia-containing tail gas treatment device as described in any of the above embodiments, wherein the evaporation crystallization device is configured to produce a crystalline salt by-product after treating wastewater, and the ammonia-containing tail gas treatment device is used to treat the ammonia-containing tail gas generated by the evaporation crystallization device when treating wastewater.

[0085] It should be noted that the evaporation and crystallization system disclosed in the present invention has all the technical features of the ammonia-containing tail gas treatment device disclosed in the present invention, and therefore has the corresponding technical effects of the above-mentioned ammonia-containing tail gas treatment device. Those skilled in the art can fully realize it based on the existing technology, and it will not be repeated herein.

[0086] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. An ammonia-containing tail gas treatment device for an evaporation crystallization system, characterized in that: The ammonia-containing tail gas treatment device comprises: A reactor having a liquid inlet configured to allow the addition of a hydrogen peroxide solution into the reactor; an anti-backflow gas guiding mechanism, wherein the anti-backflow gas guiding mechanism is configured to guide the ammonia-containing tail gas into the hydrogen peroxide solution in the reactor and prevent the hydrogen peroxide solution in the reactor from flowing back in the direction opposite to the input direction of the ammonia-containing tail gas; The reactor further has an exhaust port, which is configured to allow gas to be discharged from the reactor, wherein the gas includes an incompletely reacted ammonia-containing tail gas and nitrogen generated after the reaction.

2. The ammonia-containing tail gas treatment device according to claim 1, characterized in that: The anti-backflow air guiding mechanism comprises: Airway; An air-guiding shell, which is arranged in the reaction kettle and below the liquid inlet, and has a hollow cavity and is provided with a plurality of vent holes connected with the hollow cavity; A water baffle, the water baffle is rotatably disposed in the air guide shell and is located below the plurality of air vents, the other end of the air guide pipe is inserted into the reactor and communicates with the hollow cavity of the air guide shell below the water baffle; The water baffle is in an initial position under the action of its own weight, and when in the initial position, the water baffle disconnects the air guide pipe and the vent hole; When the pressure of the ammonia tail gas in the air duct is greater than the deadweight of the water baffle and the pressure applied by the hydrogen peroxide solution, the water baffle rotates upward from the initial position around its own rotation axis to connect the vent hole and the air duct.

3. The ammonia-containing tail gas treatment device according to claim 2, characterized in that: The anti-backflow air guide mechanism comprises two water baffles, and the two water baffles share the same rotating shaft and are rotatably arranged in the air guide shell in an axisymmetric manner.

4. The ammonia-containing tail gas treatment device according to claim 3, characterized in that: A stop ring is also provided on the inner wall of the air guide housing, and the water baffle plate located at the initial position abuts against the stop ring.

5. The ammonia-containing tail gas treatment device according to claim 2, characterized in that: The air guide pipe is provided with a first control valve, and the first control valve is configured to allow the tail gas containing ammonia to flow from the air guide pipe to the air guide shell, while preventing the hydrogen peroxide solution in the reactor from flowing back from the air guide pipe.

6. The ammonia-containing tail gas treatment device according to any one of claims 1 to 5, characterized in that: The ammonia-containing tail gas treatment device includes at least two stages of reactors arranged in sequence, each stage of the reactor is provided with the anti-backflow gas guide mechanism, and the anti-backflow gas guide mechanism of the reactor of the latter stage guides the gas discharged from the reactor of the previous stage into the reactor of the latter stage for continued reaction.

7. The ammonia-containing tail gas treatment device according to claim 6, characterized in that: The ammonia-containing tail gas treatment device also includes: A gas recovery device is configured to detect the ammonia concentration in the gas discharged from the last stage of the reactor, store the gas that meets the preset storage concentration requirements, and directly discharge the gas that does not meet the preset storage concentration requirements into the atmosphere.

8. The ammonia-containing tail gas treatment device according to claim 7, characterized in that: The gas recovery device comprises: A gas concentration detection element, wherein the gas concentration detection element is configured to detect the concentration of ammonia in the gas discharged from the last stage of the reactor; A control valve, wherein the control valve is configured to connect the exhaust port and the atmosphere when the ammonia concentration in the gas discharged from the last stage reactor exceeds the preset recovery concentration; and to connect the exhaust port and the gas storage tank when the ammonia concentration in the gas discharged from the last stage reactor does not exceed the preset recovery concentration, so as to guide the discharged gas into the gas storage tank for storage.

9. The ammonia-containing tail gas treatment device according to claim 1, characterized in that: The ammonia-containing tail gas treatment device also includes: A liquid recovery mechanism is configured to introduce the liquid generated in the reactor into the regulating tank.

10. The ammonia-containing tail gas treatment device according to claim 1, characterized in that: The ammonia-containing tail gas treatment device also includes: A detection element, wherein the detection element is configured to detect working parameters in the reactor, wherein the working parameters include a liquid level in the reactor and / or a pressure in the reactor; an alarm element, the alarm element being in communication with the detection element and sounding an alarm when an operating parameter exceeds a preset parameter; and / or, A control element is communicatively connected with the alarm element and is configured to control the reactor to shut down after receiving an alarm.

11. An evaporation crystallization system, characterized in that: The evaporation and crystallization system comprises an evaporation and crystallization device and an ammonia-containing tail gas treatment device according to any one of claims 1 to 10, wherein the evaporation and crystallization device is configured to treat the crystallized salt by-product produced after the wastewater is treated, and the ammonia-containing tail gas treatment device is used to treat the ammonia-containing tail gas produced by the evaporation and crystallization device in treating the wastewater.

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