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, in particular to an ammonia-containing tail gas treatment device of an evaporative crystallization system and the evaporative crystallization system, and the device comprises a tail gas liquefaction mechanism, a liquid storage tank and a reaction kettle. Wherein the tail gas liquefaction mechanism is configured to liquefy ammonia-containing tail gas; the liquid storage tank is communicated with the tail gas liquefaction mechanism through a first driving element, and the first driving element is used for conveying liquefied ammonia-containing tail gas to the liquid storage tank for storage; the reaction kettle is provided with a liquid inlet and an exhaust port, and the liquid inlet is configured to be used for adding a hydrogen peroxide solution into the reaction kettle; the reaction kettle is communicated with the liquid storage tank through a second driving element, the second driving element is used for conveying liquefied ammonia-containing tail gas in the liquid storage tank into the reaction kettle to be mixed with a hydrogen peroxide solution to react, and the exhaust port is constructed to discharge gas 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 tail gas liquefaction mechanism, the tail gas liquefaction mechanism being configured to liquefy the ammonia-containing tail gas;

[0006] A liquid storage tank, the liquid storage tank is connected to the tail gas liquefaction mechanism through a first driving element, and the first driving element is used to transport the liquefied ammonia-containing tail gas to the liquid storage tank for storage;

[0007] A reactor, wherein the reactor has a liquid inlet and an exhaust port, wherein the liquid inlet is configured to be used for adding a hydrogen peroxide solution into the reactor; the reactor is connected to the liquid storage tank via a second drive element, wherein the second drive element is used for transporting the liquefied ammonia-containing tail gas in the liquid storage tank to the reactor to mix with the hydrogen peroxide solution for reaction, and the exhaust port is configured to discharge the gas in the reactor.

[0008] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0009] A gas reflux pipe is connected to the liquid storage tank and the gas inlet of the tail gas liquefaction mechanism, and is configured to guide the unliquefied ammonia-containing tail gas in the liquid storage tank to the tail gas liquefaction mechanism.

[0010] In one embodiment, the tail gas liquefaction mechanism comprises:

[0011] A condensing box, the condensing box having a refrigerant liquid inlet and a refrigerant liquid discharge port, the refrigerant liquid discharge port being located above the refrigerant liquid inlet;

[0012] The heat exchange coil is located in the condensing tank and between the refrigerant liquid inlet and the refrigerant liquid outlet, and two ports are extended from the condensing tank, one of which is used to receive gaseous ammonia-containing tail gas, and the other port is connected to the liquid storage tank through a first driving element.

[0013] In one embodiment, the cold medium is calcium chloride refrigeration liquid.

[0014] In one embodiment, the ammonia-containing tail gas treatment device includes at least two stages of reactors arranged in sequence, and the two adjacent stages of the reactors are connected by a third driving element. The third driving element is used to transport the mixed liquid of the hydrogen peroxide solution and the liquefied ammonia-containing tail gas in the previous stage of the reactor to the next stage of the reactor, and the exhaust port of the previous stage of the reactor is connected to the next stage of the reactor.

[0015] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0016] 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.

[0017] In one embodiment, the gas recovery device comprises:

[0018] 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;

[0019] 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 nitrogen 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 nitrogen storage tank for storage.

[0020] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0021] A liquid recovery mechanism is configured to introduce the liquid produced in the last stage of the reactor into the regulating tank.

[0022] In one embodiment, the ammonia-containing tail gas treatment device further comprises:

[0023] 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;

[0024] 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,

[0025] A control element is communicatively connected with the alarm element and is configured to control the reactor to shut down after receiving an alarm.

[0026] 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.

[0027] 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 utilizes the tail liquefaction system to liquefy the ammonia-containing tail gas and then introduces it into the hydrogen peroxide solution in the reactor, and the two react chemically to generate harmless gas 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. It can be seen that the ammonia-containing tail gas generated by evaporation and crystallization has a reduced ammonia content in the tail gas after being treated by the device disclosed in the present invention, thereby reducing the impact of the tail gas on the environment and improving the health of the operators.

[0028] In addition, the ammonia-containing tail gas treatment device disclosed in the present invention uses at least two-stage reactors 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 ammonia pollution to the environment to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 is a schematic structural diagram of an ammonia-containing tail gas treatment device disclosed in an embodiment;

[0031] Figure 2 yes Figure 1 A local enlarged structural schematic diagram;

[0032] Figure 3 yes Figure 1 Schematic diagram of the local enlarged structure at point B.

[0033] Figures 1 to 3 The one-to-one correspondence between the component names and the reference numerals is as follows:

[0034] Tail gas liquefaction mechanism: 10 condenser; 11 heat exchange coil; 100 refrigerant medium inlet; 101 refrigerant medium outlet;

[0035] 2 liquid storage tank; 3 gas return pipe; 4 first driving element; 5 second driving element;

[0036] Reactor: 60 kettle body; 61 stirring blade; 62 driving mechanism; 63 liquid level detection element; 64 pressure detection element; 65 third driving element;

[0037] Gas recovery mechanism: 70 gas concentration detection element; 71 main exhaust pipe; 72 first exhaust pipe; 73 second exhaust pipe; 74 drying element; 75 compressor; 76 nitrogen storage tank; 77 first switch valve; 78 second switch valve; 79 third switch valve;

[0038] Liquid recovery mechanism: 80 liquid discharge pipe; 81 eighth control valve;

[0039] 91 first control valve; 92 second control valve; 93 third control valve; 94 fourth control valve; 95 fifth control valve; 96 sixth control valve; 97 seventh control valve. DETAILED DESCRIPTION

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Combination Figure 1 and Figure 2In one embodiment, the ammonia-containing tail gas treatment device of the evaporation crystallization system of the present disclosure includes a tail gas liquefaction mechanism, a liquid storage tank 2 and a reactor. The tail gas liquefaction mechanism is configured to liquefy the ammonia-containing tail gas; the liquid storage tank 2 is connected to the tail gas liquefaction mechanism through a first drive element 4, and the first drive element 4 is used to transport the liquefied ammonia-containing tail gas to the liquid storage tank 2 for storage; the reactor has a liquid inlet and an exhaust port, and the liquid inlet is configured to add a hydrogen peroxide solution into the reactor; the reactor is connected to the liquid storage tank 2 through a second drive element 5, and the second drive element 5 is used to transport the liquefied ammonia-containing tail gas in the liquid storage tank 2 to the reactor to mix with the hydrogen peroxide solution for reaction, and the exhaust port is configured to discharge the gas in the reactor.

[0046] The working process of the ammonia-containing tail gas treatment device disclosed in the present invention is as follows: first, the gaseous ammonia-containing tail gas discharged from the evaporation crystallization device is liquefied and treated by the tail gas liquefaction mechanism; secondly, the first driving element 4 is started to transport the liquefied ammonia-containing tail gas to the liquid storage tank 2; thirdly, the second driving element 5 is started to transport the liquefied ammonia-containing tail gas in the liquid storage pipe to the reactor, so that it is mixed with the hydrogen peroxide solution in the reactor to react chemically according to formula (1) to generate nitrogen and water; finally, the gas in the reactor is discharged from the exhaust port.

[0047] 2NH 3 +3H 2 O 2 →N 2 +6H 2 O Formula (1)

[0048] Among them, NH 3 is the chemical formula of ammonia, H 2 O 2 is the chemical formula of hydrogen peroxide solution, N 2 is the chemical formula of nitrogen, H 2 O is the chemical formula of water.

[0049] The ammonia-containing tail gas treatment device disclosed in the present invention utilizes a tail liquefaction system to liquefy the ammonia-containing tail gas and then introduce it into the hydrogen peroxide solution in the reactor. The two react chemically to generate harmless gases, nitrogen and water. 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. It can be seen that the ammonia-containing tail gas generated by evaporation and crystallization is treated by the device disclosed in the present invention to reduce the ammonia content of the tail gas, reduce the impact of the tail gas on the environment, and improve the health of operators.

[0050] For details, see Figure 3In one embodiment, the reactor of the present disclosure includes a reactor body 60, which may be a hollow closed box structure with a cross-sectional shape of a circle, a square, an ellipse, etc. The reactor body 60 is provided with a liquid inlet, an air inlet, and an exhaust port, wherein the liquid inlet is provided on the top cover of the reactor body 60, and the hydrogen peroxide solution is added into the reactor body 60 through the liquid inlet, and the air inlet and the exhaust port are both provided on the side wall of the reactor body 60, and both are located below the liquid inlet in the height direction. The material of the reactor body 60 is based on the conditions for the chemical reaction between ammonia gas and the hydrogen peroxide solution, for example, the material of the reactor body 60 has corrosion resistance and pressure resistance.

[0051] In detail, continue to combine Figure 1 and Figure 2 In one embodiment, the tail gas liquefaction mechanism disclosed in the present invention includes a condenser 10 and a heat exchange coil 11. The condenser 10 has a refrigerant inlet 100 and a refrigerant drain port 101, and the refrigerant drain port 101 is located above the refrigerant inlet 100; the heat exchange coil 11 is located in the condenser 10 and between the refrigerant inlet 100 and the refrigerant drain port 101, so that the heat exchange coil 11 is completely immersed in the refrigerant, and both ports of the heat exchange coil 11 extend from the condenser 10, one of which is used to receive gaseous ammonia-containing tail gas, and the other port is connected to the liquid storage tank 2 through the first driving element 4.

[0052] The specific working process of the exhaust gas liquefaction mechanism of the above structure is: first, the refrigerant is input into the condenser 10 through the refrigerant liquid inlet 100 until the heat exchange coil 11 is completely immersed in the refrigerant; secondly, the gaseous ammonia-containing exhaust gas is input into the heat exchange coil 11. Due to the temperature difference between the refrigerant and the ammonia-containing exhaust gas, the refrigerant absorbs the heat of the ammonia-containing exhaust gas to liquefy it. At the same time, the first driving element 4 is started, and the liquefied ammonia-containing exhaust gas is input from the heat exchange coil 11 into the liquid storage tank 2 for storage.

[0053] The present disclosure adopts a heat exchange tube type tail gas liquefaction mechanism, which has a simple structure and is easy to operate. Of course, in other embodiments, the tail gas liquefaction mechanism can also be implemented by equipment such as a cooling tower.

[0054] More specifically, in one embodiment, the refrigerant medium of the present invention is a calcium chloride refrigerant. Since the evaporation crystallization workshop is equipped with a calcium chloride refrigeration system, the calcium chloride refrigerant produced by the system can be used to liquefy and treat the ammonia-containing tail gas, without the need to purchase cooling towers and other equipment with gas liquefaction functions, thereby controlling the overall cost of the device within a relatively low range.

[0055] Continue to see Figure 1In one embodiment, the ammonia-containing tail gas treatment device disclosed herein further includes a gas reflux pipe 3, which connects the liquid storage tank 2 and the gas inlet of the tail gas liquefaction mechanism, and is configured to guide the gas in the liquid storage tank 2 to the heat exchange coil 11 of the tail gas liquefaction mechanism.

[0056] This arrangement can prevent the situation where the gas pressure in the liquid storage tank 2 is high and the liquefied ammonia-containing tail gas cannot be discharged into the water liquid storage tank 2, thereby ensuring the working safety and reliability of the ammonia-containing tail gas treatment device.

[0057] Continue to see Figure 3 In order to make the chemical reaction of the mixed solution in the reactor more complete, the ammonia-containing tail gas treatment device also includes a stirring blade 61 and a driving mechanism 62 for driving the stirring blade 61 to rotate. During the rotation of the stirring blade 61, 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.

[0058] Continue to see Figure 3 In one embodiment, the ammonia-containing tail gas treatment device disclosed in the present invention includes three-stage reactors arranged in sequence, and two adjacent stages of reactors are connected by a third driving element 65. The third driving element 65 is used to transport the mixed liquid of the hydrogen peroxide solution and the liquefied ammonia-containing tail gas in the previous stage reactor to the next stage reactor, and the exhaust port of the previous stage reactor is connected to the next stage reactor.

[0059] Based on the above structure, when the ammonia-containing tail gas treatment device of the present disclosure is working, the ammonia-containing tail gas after liquefaction treatment by the tail gas liquefaction mechanism is first introduced into the primary reactor to react chemically with the hydrogen peroxide solution therein. After waiting for a preset period of time, the third driving element 65 connecting the primary reactor and the secondary reactor is started to transport the mixed solution in the primary reactor to the secondary reactor to continue to react chemically with the hydrogen peroxide solution in the secondary reactor. After waiting for a preset period of time again, the third driving element 65 connecting the secondary reactor and the tertiary reactor is started to transport the mixed solution in the secondary reactor to the tertiary reactor to continue to react chemically with the hydrogen peroxide solution in the tertiary reactor. 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.

[0060] 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 the amount of harmful ammonia in the gas discharged from the reactor is controlled to the minimum content, thereby avoiding ammonia pollution to the environment to the greatest extent.

[0061] 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.

[0062] It should be noted that, among the multi-stage reactors of the ammonia-containing tail gas treatment device disclosed in the present invention, only the reactor body of the first-stage reactor is provided with a liquid inlet, and it is only necessary to add a hydrogen peroxide solution therein, and no liquid inlet is required to be reserved for other reactors. The third driving element between two adjacent reactors can introduce the mixed solution after the previous reactor reacts for a preset time into the next-stage reactor.

[0063] Furthermore, 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.

[0064] 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.

[0065] For details, see Figure 3 The gas recovery device includes a gas concentration detection element 70, a control valve and a nitrogen storage tank 76, wherein the gas concentration detection element 70 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 76 are connected to guide the discharged gas into the nitrogen storage tank 76 for storage.

[0066] In detail, the control valve includes a first switch valve 77, a second switch valve 78 and a third switch valve 79, wherein the first switch valve 77 is arranged on the main exhaust pipe 71 connected to the exhaust port, the second switch valve 78 and the third switch valve 79 are arranged on the first branch exhaust pipe 72 and the second branch exhaust pipe 73 respectively, and the first branch exhaust pipe 72 and the second straight exhaust pipe are connected in parallel and then connected in series with the main exhaust pipe 71, the first branch exhaust pipe 72 is directly connected to the atmosphere, and the second branch exhaust pipe 73 is connected to the nitrogen storage tank 76. It can be understood that the purpose of connecting the exhaust port and the atmosphere or the nitrogen storage tank 76 can be achieved by controlling the first switch valve 77, the second switch valve 78 and the third switch valve 79.

[0067] 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 element 74 and a compressor 75 which are sequentially arranged on the second exhaust pipe 73, wherein the drying element 74 is configured to dry the exhaust gas from the last stage reactor and introduce it into the compressor 75, and the compressor 75 is used to compress the dried gas and send it into the nitrogen storage tank 76.

[0068] In one embodiment, the ammonia-containing tail gas treatment device of the present disclosure further includes a liquid recovery mechanism, and the liquid recovery mechanism is configured to introduce the liquid generated in the reactor into the regulating tank.

[0069] For details, see Figure 3 The liquid recovery mechanism includes a drain pipe 80 connecting the reactor and the regulating tank, and a pump disposed on the drain pipe 80 to pump the liquid in the reactor into the regulating tank. In addition, an eighth control valve 81 is disposed on the drain pipe 80, and the eighth control valve 81 is used to selectively open or block the drain pipe 80. Specifically, when the reactor is working, the eighth control valve 81 is in a working state of blocking the drain pipe 80. When the discharge timing is met, the eighth control valve 81 is switched to a working state of opening the drain pipe 80, and the solution in the reactor is discharged through the drain pipe 80.

[0070] 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 64, and a liquid level detection element 63. The alarm element may be a sound alarm, a light alarm, or a sound and light combination alarm.

[0071] Of course, in one embodiment, the ammonia-containing tail gas treatment device disclosed herein 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, and the control element is a PLC control module.

[0072] Furthermore, the ammonia-containing tail gas treatment device of the present disclosure further comprises a display screen, which is in communication connection with the control element and is configured to display and automatically control the operating status of each device in real time. The display screen is a touch screen.

[0073] 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.

[0074] Furthermore, combined with Figure 2 and Figure 3 In one embodiment, the ammonia-containing tail gas treatment device of the present disclosure further includes a plurality of control valves, specifically, a first control valve 91 is arranged on the pipeline between the heat exchange coil 11 and the first drive element 4, and the first control valve 91 is used to conduct or block the heat exchange coil 11 and the first drive element 4; a second control valve 92 is arranged on the pipeline between the liquid storage tank 2 and the second drive element 5, and the first control valve 91 is used to conduct or block the liquid storage tank 2 and the second drive element 5; a third control valve 93 is arranged on the gas reflux pipe 3, and the third control valve 93 is used to conduct or block the gas reflux pipe 3; a fourth control valve 92 is arranged on the pipeline between the liquid storage tank 2 and the second drive element 5, and the first control valve 91 is used to conduct or block the liquid storage tank 2 and the second drive element 5; a third control valve 93 is arranged on the gas reflux pipe 3, and the third control valve 93 is used to conduct or block the gas reflux pipe 3; a fourth control valve 92 is arranged on the pipeline between the liquid storage tank 2 and the second drive element 5, and the first control valve 92 ... Valve 94 is arranged at the liquid inlet of the reactor, and the fourth control valve 94 is used to open or close the liquid inlet of the reactor; the fifth control valve 95 is arranged on the pipeline between the liquid outlet of the adjacent previous reactor and the third drive element 65, and the fifth control valve 95 is used to connect or block the reactor and the third drive element 65; the sixth control valve 96 is arranged at the exhaust port of the reactor, and the sixth control valve 96 is used to open or close the exhaust port of the reactor; the seventh control valve 97 is arranged at the air inlet of the heat exchange coil 11 of the tail gas liquefaction mechanism, and the seventh control valve 97 is used to open or close the air inlet of the heat exchange coil 11.

[0075] It can be imagined that the ammonia-containing tail gas treatment device disclosed in the present invention is provided with control valves on its various pipelines to control the conduction or blocking of the pipeline according to actual work needs, which can meet the needs of different application scenarios.

[0076] In addition, the control element can communicate with the first control valve 91, the second control valve 92, the third control valve 93, the fourth control valve 94, the fifth control valve 95, the sixth control valve 96 and / or the seventh control valve 97, and can automatically control these control valves to open or block the pipelines in which they are located based on the actual working scenario, thereby achieving the purpose of intelligent control.

[0077] It should be noted that, in one embodiment, the first driving element 4, the second driving element 5, and the third driving element 65 are all pumps. Of course, these three driving elements can also be implemented by other devices as long as they can generate power to make the liquid flow in a specified direction.

[0078] For ease of understanding, refer to Figure 2 and Figure 3 , 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.

[0079] The ammonia-containing exhaust gas generated by the evaporation and crystallization device first enters the exhaust gas liquefaction mechanism through the seventh control valve 97. The ammonia concentration detection element at the air inlet can monitor the ammonia concentration of the exhaust gas in real time. The liquefied ammonia-containing exhaust gas then enters the liquid storage tank 2 through the first control valve 91 and the first drive element 4 for storage. At the same time, the original gas in the liquid storage tank 2 is merged into the air inlet of the exhaust gas liquefaction mechanism through the gas reflux pipe 3 to prevent the high gas pressure in the liquid storage tank 2 from causing the liquid to not be discharged into the liquid storage tank 2.

[0080] Then, the liquefied ammonia-containing tail gas in the liquid storage tank 2 enters the primary reactor through the second control valve 92 and the second drive element 5, and at the same time, the hydrogen peroxide solution enters the primary reactor through the hydrogen peroxide feed pipe. The liquid level in the reactor is controlled by the liquid level detection element 63. After the liquid level reaches below the overflow port, the feeding is stopped and the stirring blade 61 starts stirring. After the preset stirring time, the liquid in the primary reactor is transferred to the secondary reactor through the fifth control valve 95 and the third drive element 65 to perform the same operation. After the preset stirring time, the liquid in the secondary reactor is transferred to the tertiary reactor for stirring.

[0081] After the stirring is completed, the generated gas is detected by the gas concentration detection element 70 at the main exhaust pipe 71 to detect the ammonia content in the discharged gas. If it meets the standard, it can be dried and compressed by the drying element 74 and the compressor 75 and then enter the nitrogen storage tank for storage and reuse; the gas that does not meet the standard can be discharged directly, because the ammonia concentration has been greatly reduced at this time, and discharging it into the environment has almost no impact on the environment, meeting the environmental protection requirements while improving the health of the staff.

[0082] The liquid produced by the reaction is mainly water, which can be returned to the regulating tank for reuse, ensuring that no harmful substances are produced in the entire process. During the reaction, the control element and various detection elements control and monitor the working parameters such as the liquid level, pressure and ammonia concentration in the reactor in real time. If there is any abnormality, an alarm will be immediately issued and emergency shutdown measures will be automatically taken to ensure the controllability and safety of the entire reaction process.

[0083] 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.

[0084] 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.

[0085] 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 tail gas liquefaction mechanism, the tail gas liquefaction mechanism being configured to liquefy the ammonia-containing tail gas; a liquid storage tank, the liquid storage tank being connected to the tail gas liquefaction mechanism via a first drive element (4), the first drive element (4) being used to transport the liquefied ammonia-containing tail gas to the liquid storage tank for storage; A reactor, the reactor having a liquid inlet and an exhaust port, the liquid inlet being configured to be used for adding a hydrogen peroxide solution into the reactor; the reactor being connected to the liquid storage tank via a second drive element (5), the second drive element (5) being configured to transport the liquefied ammonia-containing tail gas in the liquid storage tank into the reactor to mix with the hydrogen peroxide solution for reaction, and the exhaust port being configured to discharge the gas in the reactor.

2. The ammonia-containing tail gas treatment device according to claim 1, characterized in that: The ammonia-containing tail gas treatment device also includes: A gas reflux pipe (3), the gas reflux pipe (3) being connected to the liquid storage tank and the gas inlet of the tail gas liquefaction mechanism, and being configured to guide the gas in the liquid storage tank to the tail gas liquefaction mechanism.

3. The ammonia-containing tail gas treatment device according to claim 1, characterized in that: The tail gas liquefaction mechanism comprises: A condensing box (10), the condensing box (10) having a refrigerant liquid inlet (100) and a refrigerant liquid discharge port (101), the refrigerant liquid discharge port (101) being located above the refrigerant liquid inlet (100); A heat exchange coil (11), the heat exchange coil (11) being located in the condensing tank (10) and between the refrigerant liquid inlet (100) and the refrigerant liquid outlet (101), and having two ports extending from the condensing tank (10), one of the ports being used to receive gaseous ammonia-containing tail gas, and the other port being connected to the liquid storage tank via a first driving element (4).

4. The ammonia-containing tail gas treatment device according to claim 3, characterized in that: The refrigerant is calcium chloride refrigerant.

5. The ammonia-containing tail gas treatment device according to any one of claims 1 to 4, characterized in that: The ammonia-containing tail gas treatment device comprises at least two stages of reactors arranged in sequence, wherein the two adjacent stages of reactors are connected via a third driving element (65), wherein the third driving element (65) is used to transport a mixed liquid of a hydrogen peroxide solution and liquefied ammonia-containing tail gas in the reactor of the previous stage to the reactor of the next stage, and an exhaust port of the reactor of the previous stage is connected to the reactor of the next stage.

6. The ammonia-containing tail gas treatment device according to claim 5, 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.

7. The ammonia-containing tail gas treatment device according to claim 6, characterized in that: The gas recovery device comprises: A gas concentration detection element (70), the gas concentration detection element (70) being 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 nitrogen 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 nitrogen storage tank for storage.

8. The ammonia-containing tail gas treatment device according to claim 5, characterized in that: The ammonia-containing tail gas treatment device also includes: A liquid recovery mechanism is configured to introduce the liquid in the last stage of the reactor into the regulating tank.

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 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.

10. 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 9, 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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