Multistage spray tower system with automatic dosing function

Abstract

This utility model relates to a multi-stage spray tower system with automatic dosing function. The multi-stage spray tower system with automatic dosing function includes multiple spray towers, a dosage detection device, a liquid level detection device installed in each spray tower, a dosing device, a control valve group, and a control device, enabling automatic dosing in different operating modes. During waste gas treatment, the dosage detection device monitors the dosage of the liquid in the frontmost spray tower only. When the detected dosage falls below a preset threshold, the prepared absorbent is automatically added to multiple spray towers, ensuring that the treatment efficiency of the absorbent in each spray tower remains stable within a certain range during waste gas treatment, and automatically increasing the concentration of the absorbent in the spray towers. Automatic dosing is achieved by installing a dosage detection device only in the frontmost spray tower; dosage detection devices are not needed in the other spray towers, significantly reducing the number of instruments required.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment equipment technology, and in particular to a multi-stage spray tower system with automatic dosing function. Background Technology

[0002] A spray tower is a type of jet-type tray scrubber that is highly effective in treating industrial waste gas and wastewater. It has advantages such as simple structure, low price, good corrosion resistance, light weight, and large waste gas treatment capacity. It is suitable for the absorption and purification of acid and alkali mist gases generated during the production of large equipment in industries such as instrument electroplating and metallurgy.

[0003] A spray tower equipped with nozzles atomizes liquid into a mist or raindrops. Gas enters from the bottom of the tower and comes into close contact with the mist or raindrops, facilitating mass transfer and absorption of readily soluble components. However, multi-stage spray towers operating in series require multiple monitoring instruments on each tower for monitoring. Without these instruments, automatic dosing cannot be performed periodically, leading to a decreasing absorbent concentration. Failure to replenish absorbent in a timely manner results in decreasing absorption efficiency and reduced overall treatment capacity. Therefore, traditional multi-stage spray towers cannot simultaneously address both the issues of excessive monitoring and declining treatment efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a multi-stage spray tower system with automatic dosing function that can simultaneously solve the problems of excessive instruments and decreasing treatment efficiency of absorbent liquid in traditional multi-stage spray towers.

[0005] A multi-stage spray tower system with automatic dosing function includes:

[0006] Multiple spray towers are arranged sequentially at intervals; the bottom ends of the multiple spray towers are connected in series; each spray tower has an air outlet at its top; each spray tower has an air inlet and a chemical dosing port at its bottom; the air outlet of each spray tower is connected to the air inlet of the next adjacent spray tower; the bottom of the foremost spray tower also has a drain outlet.

[0007] A dosage detection device is used to monitor the dosage of medicine in the absorbent liquid inside the front spray tower.

[0008] The liquid level detection device installed in each of the spray towers is used to collect the liquid level information in the corresponding spray tower.

[0009] A dosing device is used to prepare an absorbent solution with a preset drug content; the outlet of the dosing device is connected to multiple dosing ports via a dosing pump.

[0010] The control valve assembly includes a first switch valve disposed on the communication passage between the bottom ends of two adjacent spray towers, a second switch valve disposed on the communication passage between the dosing pump and each dosing port, and a third switch valve disposed at the drain port.

[0011] The control device is communicatively connected to the dosage detection device and the multiple liquid level detection devices in the tower, and is also connected to the dosing pump, the multiple first switching valves, the multiple second switching valves and the third switching valve, and is used to switch the working mode of the multi-stage spray tower system with automatic dosing function to the start-up mode or the waste gas treatment dosing circulation mode by controlling the dosing pump, the multiple first switching valves, the multiple second switching valves and the third switching valve to open and close in a preset sequence.

[0012] When in the start-up mode, the absorbent liquid prepared in the dosing device can be added to multiple spray towers until the absorbent liquid level in each spray tower is greater than or equal to the preset high liquid level in the tower.

[0013] When in the waste gas treatment dosing circulation mode, waste gas treatment can be performed, and when the content of the absorbent in the front spray tower is lower than the preset dosage threshold, the absorbent in the front spray tower can be discharged through the drain port, and after the absorbent flows freely between multiple spray towers, the absorbent prepared in the dosing device is replenished to multiple spray towers.

[0014] In one embodiment, the drug dosage detection device includes a conductivity meter and a pH meter; both the conductivity meter and the pH meter are installed in the frontmost spray tower and are used to monitor the conductivity and pH value in the frontmost spray tower, respectively; when the conductivity value is found to be greater than a preset conductivity threshold and the pH value is within a preset pH value range, it indicates that the drug content in the absorbent liquid in the frontmost spray tower is greater than or equal to the preset drug dosage threshold.

[0015] In one embodiment, the preset conductivity threshold is 300 μS / cm, and the preset pH value range is 6 to 8.

[0016] In one embodiment, the dosing device further includes a dosing liquid level detection element; the dosing liquid level detection element is used to monitor the liquid level information of the absorbent liquid in the dosing device; the control device is communicatively connected to the dosing liquid level detection element and is used to control the dosing pump to start, multiple first switch valves to open, multiple second switch valves to open, and the third switch valve to close when the multi-stage spray tower system with automatic dosing function is in the start-up mode, so as to inject the prepared absorbent liquid in the dosing device into multiple spray towers respectively.

[0017] In one embodiment, in the foremost spray tower, the height of the drain outlet is lower than the height of the dosing port and the height of the air inlet.

[0018] In one embodiment, the bottom ends of the plurality of spray towers are connected in series, and the position height of the connecting ports is lower than the position height of their respective air inlets and chemical dosing ports.

[0019] In one embodiment, the bottom ends of the plurality of spray towers are connected in series via a first connecting pipe equipped with the first switching valve.

[0020] In one embodiment, the system further includes a dosing pipeline, which includes a main dosing pipe and a plurality of branch dosing pipes, each having one end connected to one end of the main dosing pipe. The end of the main dosing pipe away from the branch dosing pipes is connected to the outlet of the dosing pump. The ends of the plurality of branch dosing pipes away from the main dosing pipe are respectively connected to a plurality of dosing ports. Each branch dosing pipe is provided with a second switching valve.

[0021] The aforementioned multi-stage spray tower system with automatic dosing function automatically switches its operating mode between start-up mode and waste gas treatment dosing circulation mode via a control device, and can achieve automatic dosing in both operating modes. During waste gas treatment, the first spray tower is the first to come into contact with and treat the waste gas, thus experiencing the highest concentration of waste gas. Therefore, a dosing detection device monitors only the dosing content in the liquid of the first spray tower. When the dosing content falls below a preset threshold, the absorbent liquid in the first spray tower is discharged, and the prepared absorbent liquid from the dosing device is automatically replenished to the last spray tower. Simultaneously, the absorbent liquid flows freely between multiple spray towers, achieving the purpose of replenishing absorbent liquid to multiple spray towers. This ensures that the treatment efficiency of the absorbent liquid in each spray tower remains stable within a certain range during waste gas treatment, automatically increasing the concentration of absorbent liquid in the spray towers and reducing labor costs. Moreover, automatic dosing can be achieved by installing a dosage detection device only in the front spray tower, and no dosage detection devices are needed in the other spray towers, which greatly reduces the number of instruments.

[0022] Moreover, the multi-stage spray tower system with automatic dosing function mentioned above will only discharge the absorbent liquid in the front spray tower each time it discharges liquid during the waste gas treatment process. Compared with the traditional method of independently detecting parameters and independently dosing chemicals between multiple spray towers, the above method of only discharging the absorbent liquid in the front spray tower can greatly reduce the waste of absorbent liquid and reduce the cost of waste gas treatment.

[0023] Furthermore, in traditional multi-stage spray tower systems where multiple spray towers operate independently with separate monitoring and dosing, the absorbent concentration in one tower may be higher than in the next. In such cases, waste gas exiting one tower and entering another could become contaminated there, affecting the overall treatment efficiency. However, in the aforementioned multi-stage spray tower system with automatic dosing, the absorbent flows freely between the towers. After the absorbent in the frontmost tower is discharged, it flows sequentially from the rear to the front, ensuring consistent concentration across all towers. During dosing, absorbent is first added to the rearmost tower, while simultaneously flowing sequentially from the rearmost towers to the front, until all towers reach a preset high level. This further ensures consistent concentration, preventing contamination of the treated waste gas and guaranteeing a higher treatment efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a multi-stage spray tower system with automatic dosing function in a preferred embodiment of the present invention.

[0025] The reference numerals in the attached diagram are as follows: 100. Multi-stage spray tower system with automatic dosing function; 110. Spray tower; 111. Air outlet; 112. Air inlet; 113. Dosing port; 114. Drain outlet; 120. Dosing level detection device; 121. Conductivity meter; 122. pH meter; 130. Liquid level detection device inside the tower; 140. Dosing device; 150. Dosing pump; 160. Control valve group; 161. First switching valve; 162. Second switching valve; 163. Third switching valve; 170. Control device; 180. Dosing liquid level detection device; 190. First connecting pipe; 201. Dosing pipeline; 2011. Dosing main pipe; 2012. Dosing branch pipe. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements. It is also understood that when an element is referred to as being "between" two elements, it may be the only one between the two elements, or there may be one or more intermediate elements.

[0029] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0030] Appendix Figure 1 The diagram illustrates the structure of a multi-stage spray tower system with automatic dosing function according to an embodiment of the present invention. For ease of explanation, the accompanying drawings only show structures relevant to embodiments of the present invention.

[0031] Please see Figure 1 The multi-stage spray tower system 100 with automatic dosing function in the preferred embodiment of this utility model includes multiple spray towers 110, a dosing detection device 120, a tower liquid level detection device 130 installed in each spray tower 110, a dosing device 140, a control valve group 160 and a control device 170.

[0032] Multiple spray towers 110 are arranged sequentially at intervals. The bottom ends of the multiple spray towers 110 are connected in series. Each spray tower 110 has an air outlet 111 at its top. Each spray tower 110 has an air inlet 112 and a chemical dosing port 113 at its bottom. The air outlet 111 of each spray tower 110 is connected to the air inlet 112 of the next adjacent spray tower. The bottom of the foremost spray tower 110 also has a drain port 114.

[0033] The dosage detection device 120 is used to monitor the dosage of the absorbent in the front spray tower 110.

[0034] The liquid level detection element 130 inside the tower is used to collect the liquid level information inside the corresponding spray tower 110.

[0035] The dosing device 140 is used to prepare an absorbent solution with a preset dosage. The outlet of the dosing device 140 is connected to multiple dosing ports 113 via a dosing pump 150. The dosing device 140 can mix the added reagent and water in a certain proportion by stirring, vibration, or other means to obtain the prepared absorbent solution.

[0036] The control valve assembly 160 includes a first switch valve 161 disposed on the communication passage between the bottom ends of two adjacent spray towers 110, a second switch valve 162 disposed on the communication passage between the dosing pump 150 and each dosing port 113, and a third switch valve 163 disposed at the drain port 114.

[0037] The control device 170 is communicatively connected to the dosage detection element 120 and multiple tower liquid level detection elements 130, and is also connected to the dosing pump 150, multiple first switching valves 161, multiple second switching valves 162 and third switching valves 163, and is used to switch the working mode of the multi-stage spray tower system 100 with automatic dosing function to the start-up mode or the waste gas treatment dosing circulation mode by controlling the dosing pump 150, multiple first switching valves 161, multiple second switching valves 162 and third switching valves 163 to open and close in a preset sequence.

[0038] When in startup mode, the absorbent liquid prepared in the dosing device 140 can be added to multiple spray towers 110 until the absorbent liquid level in each spray tower 110 is greater than or equal to the preset high liquid level in the tower.

[0039] When in the waste gas treatment dosing circulation mode, it can treat waste gas, and when the content of the absorbent in the front spray tower 110 is lower than the preset dosing threshold, it can discharge the absorbent in the front spray tower 110 through the drain port 114, and ensure that the absorbent flows between multiple spray towers 110 by gravity, and then replenish the absorbent prepared in the dosing device 140 to multiple spray towers 110.

[0040] For ease of understanding, the working process of the multi-stage spray tower system 100 with automatic dosing function described above is briefly described below:

[0041] (1) Add water and reagents in a preset ratio into the dosing device 140 so as to prepare the absorbent liquid required for waste gas treatment using the dosing device 140.

[0042] (2) The operating mode of the multi-stage spray tower system 100 with automatic dosing function is switched to the start mode by the control device 170. At this time, the dosing pump 150 is in the open state, and all the second switch valves 162 and all the third switch valves 163 are in the open state. The dosing pump 150 injects the absorbent liquid prepared in the dosing device 140 into multiple spray towers 110 respectively. During the dosing process, multiple tower liquid level detectors 130 monitor the liquid level in their respective spray towers 110. Once the liquid level in the spray tower 110 is detected to be greater than or equal to the preset high liquid level in the tower, the control device 170 immediately controls the second switch valve 162 corresponding to the spray tower 110 to close until the liquid level in all spray towers 110 is greater than or equal to the preset high liquid level in the tower. Then, all the second switch valves 162 and the dosing pump 150 are closed to complete the start dosing action.

[0043] (3) The operating mode of the multi-stage spray tower system 100 with automatic dosing function is switched to the wastewater treatment dosing circulation mode by the control device 170. At this time, the dosing pump 150, all the first switch valves 161, all the second switch valves 162 and the third switch valve 163 are closed. The waste gas to be treated is input into the air inlet 112 of the frontmost spray tower 110. The waste gas passes through all the spray towers 110 in series and flows out from the air outlet 111 of the last spray tower 110, so as to use the absorbent liquid in the spray tower 110 to treat the waste gas in multiple stages.

[0044] During wastewater treatment, the dosage detection device 120 monitors the dosage of the absorbent in the frontmost spray tower 110 in real time. When the dosage of the absorbent in the frontmost spray tower 110 is detected to be less than the preset dosage threshold, the control device 170 controls the third switch valve 163 to open. At this time, the absorbent in the frontmost spray tower 110 is discharged through the drain port 114. The third switch valve 163 is closed when the liquid level detection device 130 detects that the liquid level in the frontmost spray tower 110 is less than or equal to the first preset low liquid level. At the same time, all the first switch valves 161 are opened to connect the bottom ends of multiple spray towers 110 in sequence. At this time, the absorbent in multiple spray towers 110 will flow towards the frontmost spray tower 110 through mutual flow. The liquid flows in the front spray tower 110 until the liquid level detection device 130 detects that the liquid level in the last spray tower 110 has dropped to less than or equal to the second low liquid level. Then, the second switch valve 162 corresponding to the last spray tower 110 is opened, and the dosing pump 150 is started to pump the absorbent liquid prepared in the dosing device 140 into the last spray tower 110. The absorbent liquid is then replenished to all the front spray towers 110 in sequence through the last spray tower 110 until the liquid level in the last spray tower 110 is detected to be greater than or equal to the preset high liquid level in the tower. Then, the second switch valve 162 corresponding to the last spray tower 110 is closed, and the dosing pump 150 is turned off to facilitate the treatment of exhaust gas again.

[0045] Therefore, the above-mentioned multi-stage spray tower system 100 with automatic dosing function can automatically switch the working mode to the start-up mode and the exhaust gas treatment dosing cycle mode through the control device 170, and can realize the automatic dosing function in both working modes.

[0046] In the waste gas treatment process, the first spray tower 110 is the first to come into contact with the waste gas and undergo waste gas treatment. Therefore, the concentration of waste gas in the first spray tower 110 is also the highest. So, the dosage detection device 120 monitors the dosage of the liquid in the first spray tower 110. When the dosage is found to be lower than the preset threshold, the absorbent liquid in the first spray tower 110 is discharged. Then, the absorbent liquid prepared in the dosing device 140 is automatically replenished to the last spray tower 110. At the same time, the absorbent liquid flows between multiple spray towers 110 by gravity to achieve the purpose of replenishing the absorbent liquid in multiple spray towers 110. This ensures that the treatment efficiency of the absorbent liquid in each spray tower 110 of the multi-stage spray tower system 100 with automatic dosing function is kept within a stable range during the waste gas treatment process, realizes the automatic increase of the absorbent liquid concentration in the spray tower 110, and reduces labor costs. Moreover, the automatic dosing function can be achieved by only installing a dosage detection device 120 in the front spray tower 110, and there is no need to install dosage detection devices 120 in the other spray towers 110, which greatly reduces the number of instruments.

[0047] Therefore, the multi-stage spray tower system 100 with automatic dosing function solves the problems of excessive instruments and the decreasing efficiency of absorbent treatment in the traditional multi-stage spray tower 110. It ensures that the efficiency of absorbent treatment can be kept stable within a certain range while reducing the number of instruments.

[0048] Moreover, in the process of treating waste gas, the multi-stage spray tower system 100 with automatic dosing function will only discharge the absorbent liquid in the front spray tower 110 each time it discharges liquid. Compared with the traditional method of independently detecting parameters and dosing chemicals between multiple spray towers, the above method of only discharging the absorbent liquid in the front spray tower 110 can greatly reduce the waste of absorbent liquid and reduce the cost of waste gas treatment.

[0049] In addition, the traditional method of independent detection and dosing of multiple spray towers may result in a situation where the concentration of absorbent in the previous spray tower is higher than that in the next spray tower. In this case, the exhaust gas exiting from the previous spray tower and entering the next spray tower may be contaminated in the next spray tower, thus affecting the overall effect of exhaust gas treatment. In the aforementioned multi-stage spray tower system 100 with automatic dosing function, because the absorbent liquid can flow freely between multiple spray towers 110, after the absorbent liquid in the frontmost spray tower 110 is discharged, the absorbent liquid in the subsequent spray towers 110 will flow sequentially from the rear to the front, ensuring that the concentration of the absorbent liquid in multiple spray towers 110 is consistent. Moreover, during dosing, absorbent liquid is first added to the rearmost spray tower 110, and at the same time, the absorbent liquid in the rearmost spray towers 110 will also flow sequentially from the rear to the front, until the liquid level of the absorbent liquid in all spray towers 110 reaches the preset high level, further ensuring that the concentration of the absorbent liquid in all spray towers 110 is consistent, avoiding the pollution of the waste gas during the treatment process, and ensuring a high waste gas treatment effect.

[0050] In some embodiments, the drug dosage detection device 120 includes a conductivity meter 121 and a pH meter 122. Both the conductivity meter 121 and the pH meter 122 are disposed within the foremost spray tower 110 and are used to monitor the conductivity and pH values ​​within the foremost spray tower 110, respectively. Both the conductivity meter 121 and the pH meter 122 are communicatively connected to the control device 170. When the detected conductivity value is greater than a preset conductivity threshold and the pH value is within a preset pH range, it indicates that the drug content in the absorbent liquid within the foremost spray tower 110 is less than or equal to the preset drug dosage threshold.

[0051] Therefore, by monitoring the conductivity and pH value of the absorbent in the front spray tower 110 using a conductivity meter 121 and a pH meter 122 respectively, the drug content in the absorbent in the front spray tower 110 can be monitored.

[0052] The waste gas to be treated often contains electrolytes, acidic or alkaline substances. During the waste gas treatment process, the absorbent liquid in the spray tower 110 comes into contact with the waste gas to absorb the electrolytes and acidic or alkaline substances in the waste gas. As the amount of electrolytes and acidic or alkaline substances in the waste gas absorbed by the absorbent liquid increases, the conductivity of the absorbent liquid will gradually increase, and the pH value of the absorbent liquid will gradually become neutral. Therefore, the amount of chemical in the absorbent liquid can be accurately determined by the conductivity and pH value.

[0053] Furthermore, in some embodiments, the preset conductivity threshold is 300 μS / cm, and the preset pH range is 6–8. Thus, when the conductivity meter detects that the conductivity of the absorbent in the frontmost spray tower 110 is greater than or equal to 300 μS / cm, and the pH meter 122 detects that the pH of the absorbent in the frontmost spray tower 110 is within the range of 6–8, it indicates that the drug content in the absorbent in the frontmost spray tower 110 is already very low, and the expected waste gas treatment effect cannot be achieved.

[0054] In some embodiments, the dosing device 140 further includes a dosing liquid level detection element 180. The dosing liquid level detection element 180 is used to monitor the liquid level information of the absorbent liquid in the dosing device 140. The control device 170 is communicatively connected to the dosing liquid level detection element 180 and is used to control the dosing pump 150 to start, multiple first switch valves 161 to open, multiple second switch valves 162 to open, and a third switch valve 163 to close when the multi-stage spray tower system 100 with automatic dosing function is in the start-up mode, if the liquid level of the absorbent liquid in the dosing device 140 is detected to be greater than or equal to the preset high dosing liquid level, so as to inject the prepared absorbent liquid in the dosing device 140 into multiple spray towers 110 respectively.

[0055] Thus, before injecting absorbent into the multiple spray towers 110 in the start-up mode, the control device 170 will only control all the second switch valves 162 to open and simultaneously control the dosing pump 150 to start when the dosing level detection element 180 detects that the liquid level in the dosing device 140 is greater than or equal to the preset high dosing level. This is to achieve the purpose of injecting absorbent into the multiple spray towers 110, so as to ensure that the multi-stage spray tower system 100 with automatic dosing function has sufficient absorbent supply in the dosing device 140 each time it is started, and to ensure that a sufficient amount of absorbent can be injected into the multiple spray towers 110 at one time.

[0056] In some embodiments, in the foremost spray tower 110, the height of the drain port 114 is lower than the height of the dosing port 113 and the air inlet 112, respectively. Thus, the drain port 114 is at the lowest position on the foremost spray tower 110, ensuring that the absorbent liquid in the foremost spray tower 110 can flow out at a very fast rate when it needs to be discharged, and ensuring that as much absorbent liquid as possible can automatically flow out through the drain port 114.

[0057] In some embodiments, the connection ports of the bottom ends of the plurality of spray towers 110 are connected in series at a height lower than the corresponding air inlet 112 and chemical dosing inlet 113. Therefore, the connection ports of the bottom ends of the plurality of spray towers 110 are all located at the low position of their respective spray towers 110, so as to ensure that the liquid level in the plurality of spray towers 110 is basically the same after the absorbent liquid in the multiple spray towers 110 flows by gravity and interconnects.

[0058] In some embodiments, the bottom ends of multiple spray towers 110 are connected in series via a first connecting pipe 190, which is provided with a first switching valve 161. The length of the first connecting pipe 190 can be freely selected according to the distance between two adjacent spray towers 110. Therefore, the provision of the first connecting pipe 190 can increase the degree of freedom in the on-site installation of multiple spray towers 110, allowing the spray towers 110 to freely choose the installation position according to the site conditions, and reducing the on-site installation difficulty of multiple spray towers 110.

[0059] In some embodiments, the multi-stage spray tower system 100 with automatic dosing function further includes a dosing pipeline 201, which includes a main dosing pipe 2011 and a plurality of branch dosing pipes 2012, each with one end connected to one end of the main dosing pipe 2011. The end of the main dosing pipe 2011 away from the branch dosing pipes 2012 is connected to the outlet of the dosing pump 150. The ends of the plurality of branch dosing pipes 2012 away from the main dosing pipe 2011 are respectively connected to a plurality of dosing ports 113. Each branch dosing pipe 2012 is provided with a second switching valve 162.

[0060] The lengths of the main dosing pipe 2011 and the branch dosing pipe 2012 can be selected according to the actual conditions of the installation site to facilitate the connection between the dosing pump 150 and multiple dosing ports 113, so that the dosing pump 150 and the dosing device 140 can be installed in suitable positions according to the site conditions, effectively reducing the difficulty of on-site installation of the dosing pump 150 and the dosing device 140.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A multi-stage spray tower system with automatic dosing function, characterized in that, include: Multiple spray towers are arranged sequentially at intervals; the bottom ends of the multiple spray towers are connected in series; each spray tower has an air outlet at its top; each spray tower has an air inlet and a chemical dosing port at its bottom; the air outlet of each spray tower is connected to the air inlet of the next adjacent spray tower; the bottom of the foremost spray tower also has a drain outlet. A dosage detection device is used to monitor the dosage of medicine in the absorbent liquid inside the front spray tower. The liquid level detection device installed in each of the spray towers is used to collect the liquid level information in the corresponding spray tower. A dosing device is used to prepare an absorbent solution with a preset drug content; the outlet of the dosing device is connected to multiple dosing ports via a dosing pump. The control valve assembly includes a first switch valve disposed on the communication passage between the bottom ends of two adjacent spray towers, a second switch valve disposed on the communication passage between the dosing pump and each dosing port, and a third switch valve disposed at the drain port. The control device is communicatively connected to the dosage detection device and the multiple liquid level detection devices in the tower, and is also connected to the dosing pump, the multiple first switching valves, the multiple second switching valves and the third switching valve, and is used to switch the working mode of the multi-stage spray tower system with automatic dosing function to the start-up mode or the waste gas treatment dosing circulation mode by controlling the dosing pump, the multiple first switching valves, the multiple second switching valves and the third switching valve to open and close in a preset sequence. When in the start-up mode, the absorbent liquid prepared in the dosing device can be added to multiple spray towers until the absorbent liquid level in each spray tower is greater than or equal to the preset high liquid level in the tower. When in the waste gas treatment dosing circulation mode, waste gas treatment can be performed, and when the content of the absorbent in the front spray tower is lower than the preset dosage threshold, the absorbent in the front spray tower can be discharged through the drain port, and after the absorbent flows freely between multiple spray towers, the absorbent prepared in the dosing device is replenished to multiple spray towers.

2. The multi-stage spray tower system with automatic dosing function according to claim 1, characterized in that, The drug dosage detection device includes a conductivity meter and a pH meter; both the conductivity meter and the pH meter are installed in the frontmost spray tower and are used to monitor the conductivity and pH value in the frontmost spray tower, respectively; when the conductivity value is found to be greater than a preset conductivity threshold and the pH value is within a preset pH value range, it indicates that the drug content in the absorbent liquid in the frontmost spray tower is greater than or equal to the preset drug dosage threshold.

3. The multi-stage spray tower system with automatic dosing function according to claim 2, characterized in that, The preset conductivity threshold is 300 μS / cm, and the preset pH value range is 6 to 8.

4. The multi-stage spray tower system with automatic dosing function according to claim 1, characterized in that, The dosing device also includes a dosing liquid level detection element; the dosing liquid level detection element is used to monitor the liquid level information of the absorbent liquid in the dosing device; the control device is communicatively connected to the dosing liquid level detection element and is used to control the dosing pump to start, multiple first switch valves to open, multiple second switch valves to open, and the third switch valve to close when the liquid level of the absorbent liquid in the dosing device reaches the preset high dosing liquid level, so as to inject the prepared absorbent liquid in the dosing device into multiple spray towers respectively.

5. The multi-stage spray tower system with automatic dosing function according to claim 1, characterized in that, In the frontmost spray tower, the height of the drain outlet is lower than the height of the dosing port and the air inlet.

6. The multi-stage spray tower system with automatic dosing function according to claim 1, characterized in that, The bottom ends of the multiple spray towers are connected in series, and the position of the connecting port is lower than the position of their respective air inlet and chemical dosing port.

7. The multi-stage spray tower system with automatic dosing function according to claim 1, characterized in that, The bottom ends of the multiple spray towers are connected in series through a first connecting pipe equipped with the first switching valve.

8. The multi-stage spray tower system with automatic dosing function according to claim 1, characterized in that, It also includes a dosing pipeline, which includes a main dosing pipe and a plurality of branch dosing pipes, one end of which is connected to one end of the main dosing pipe; the end of the main dosing pipe away from the branch dosing pipes is connected to the outlet of the dosing pump; the ends of the plurality of branch dosing pipes away from the main dosing pipe are respectively connected to a plurality of dosing ports one by one; and each branch dosing pipe is provided with a second switching valve.

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