Ammonia nitrogen on-line analyzer
By designing an online ammonia nitrogen analyzer, ammonia nitrogen is separated from water samples using a distillation device, which solves the problem of interference from complex substances in wastewater and improves the accuracy and efficiency of ammonia nitrogen detection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 中石化(天津)石油化工有限公司
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-21
AI Technical Summary
In existing technologies, the detection of ammonia nitrogen in wastewater is affected by complex substances in the water sample, resulting in poor detection accuracy.
An online ammonia nitrogen analyzer is used, which combines a peristaltic pump, a quantitative device, a valve module, a colorimetric device, and a distillation device. The ammonia nitrogen is separated from the water sample by the distillation device and then measured by colorimetry in the colorimetric device, thus avoiding interference from complex substances.
It improves the accuracy of ammonia nitrogen detection, especially in industrial wastewater detection, reducing interference from turbidity, color, metal ions and organic matter, and achieving efficient ammonia nitrogen concentration calculation.
Smart Images
Figure CN224535810U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of water quality analysis technology, and in particular to an online ammonia nitrogen analyzer. Background Technology
[0002] Ammonia nitrogen detection in wastewater is one of the core indicators of water quality monitoring. Ammonia nitrogen content reflects the degree of pollution of water bodies by domestic sewage, agricultural runoff, and industrial wastewater. Industrial wastewater samples contain more complex pollutants with higher concentrations and more interfering substances, including oil, metal ions, and organic matter.
[0003] In related technologies, sodium salicylate or Nessler's reagent spectrophotometry is used to directly detect ammonia nitrogen content in wastewater. However, this method is affected by other complex substances in the water sample, and the interference cannot be eliminated by diluting the water sample or adding masking agents, resulting in poor accuracy of wastewater ammonia nitrogen detection. Utility Model Content
[0004] The purpose of this application is to provide an online ammonia nitrogen analyzer to solve the technical problem that the accuracy of ammonia nitrogen detection in wastewater is poor due to interference from other complex substances in the water sample.
[0005] To achieve the above objectives, this application provides an online ammonia nitrogen analyzer, which includes a reversible peristaltic pump, a quantitative device, a valve module, a colorimetric device, and a distillation device. The valve module includes a first valve port, a second valve port, a sample valve, and a colorimetric valve. The first valve port is connected to the second valve port, and the sample valve and the colorimetric valve are respectively connected to the second valve port.
[0006] The peristaltic pump is connected to the metering device through a first pipe, the metering device is connected to the first valve port through a second pipe, the second valve port is connected to the distillation device through a third pipe, the distillation device is connected to the colorimetric device through a fourth pipe, and the colorimetric device is connected to the colorimetric valve through a fifth pipe.
[0007] The peristaltic pump is used to pump the water sample from the sample valve into the metering device, and also to pump the water sample from the metering device into the distillation device; the distillation device is used to distill ammonia nitrogen from the water sample and deliver it to the colorimetric device for colorimetric analysis.
[0008] Optionally, the distillation apparatus includes a steam oven, a distiller, and a cooling water system; the second valve port is connected to the steam oven via the third pipe; and the distiller is mounted on the fourth pipe.
[0009] The steam oven is used to convert dissolved ammonia nitrogen and ammonia ions in the water sample into ammonia gas, and the cold water system is used to convert water vapor in the distiller into liquid water so that the ammonia gas can be separated from the liquid water.
[0010] Optionally, the online ammonia nitrogen analyzer further includes a gas pump connected to the third pipeline, the gas pump being used at least to deliver ammonia gas from the steam oven to the distiller.
[0011] Optionally, the air pump is also used to continuously blow ambient air into the steam oven after the water sample is distilled, in order to balance the air pressure inside the steam oven.
[0012] Optionally, the valve assembly module further includes a pure water valve, which is connected to the second valve port.
[0013] Optionally, the online ammonia nitrogen analyzer further includes an inlet valve and an outlet valve assembly. The inlet valve has a common end, a normally closed end, and a normally open end. The common end of the inlet valve is connected to the second valve port. The normally closed end of the inlet valve is connected to the distillation device through the third pipeline. The normally open end of the inlet valve is connected to the outlet valve assembly.
[0014] Optionally, the discharge valve assembly includes a waste liquid discharge valve and a wastewater discharge valve. The waste liquid discharge valve has a common end, a normally closed end, and a normally open end. The common end of the waste liquid discharge valve is connected to the normally open end of the sample inlet valve. A waste liquid container is connected to the normally closed end of the waste liquid discharge valve. The normally open end of the waste liquid discharge valve is connected to the wastewater discharge valve, and a wastewater container is connected to the wastewater discharge valve.
[0015] Optionally, the colorimetric device includes a colorimeter and a heater, wherein the heater is disposed inside the colorimeter or connected to the colorimeter for controlling the temperature of the colorimeter.
[0016] Optionally, the online ammonia nitrogen analyzer further includes a waste discharge pump, which is connected to the fourth pipeline.
[0017] Optionally, the valve assembly module further includes multiple reagent valves, each of which is connected to the second valve port.
[0018] This application provides an online ammonia nitrogen analyzer, which has the following advantages:
[0019] The online ammonia nitrogen analyzer includes a peristaltic pump, a quantitative device, a valve module, a colorimetric device, and a distillation device. To use the analyzer, open the sample valve, close the colorimetric valve, and start the peristaltic pump. The peristaltic pump rotates forward, pumping the wastewater sample to be tested from the second valve port through the first valve port into the quantitative device, where quantification is performed. After quantification, close the sample valve, and the peristaltic pump rotates backward, pumping the sample from the quantitative device through the valve module into the distillation device. Inside the distillation device, ammonia nitrogen is distilled from the sample and transferred to the colorimetric device. The peristaltic pump rotates forward, pumping the reagent used for colorimetry into the quantitative device. After quantification, open the colorimetric valve, and the peristaltic pump rotates backward, pumping the reagent into the colorimetric device to react with the ammonia nitrogen. After the reaction, absorbance is measured in the colorimetric device to calculate the ammonia nitrogen concentration in the water sample.
[0020] This application separates ammonia nitrogen from the wastewater sample through distillation before it is pumped into the colorimetric device, and then performs spectrophotometric colorimetric determination. This avoids interference from other complex substances in ammonia nitrogen detection, thereby improving the accuracy of ammonia nitrogen detection. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the structure of the online ammonia nitrogen analyzer provided in the embodiments of this application;
[0023] Figure 2 This is a schematic diagram of the online ammonia nitrogen analyzer provided in the embodiments of this application;
[0024] Figure 3 Another system schematic diagram of the online ammonia nitrogen analyzer provided in the embodiments of this application.
[0025] The markings in the image are as follows:
[0026] 1. Peristaltic pump; 2. Quantitative device; 3. Valve assembly module; 31. First valve port; 32. Second valve port; 33. Sample valve; 34. Colorimetric valve; 35. Pure water valve; 36. Reagent valve; 4. Colorimetric device; 41. Colorimeter; 42. Heater; 5. Distillation apparatus; 51. Oven; 52. Distiller; 53. Cold water system; 6. First pipeline; 7. Second pipeline; 8. Third pipeline; 9. Fourth pipeline; 10. Fifth pipeline; 11. Air pump; 12. Sample inlet valve; 13. Discharge valve assembly; 131. Waste liquid discharge valve; 132. Wastewater discharge valve; 14. Waste discharge pump. Detailed Implementation
[0027] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.
[0028] In the description of this application, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc. used in this application to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device and element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0029] In the description of this application, it should be understood that the terms "first," "second," etc., are used to describe various types of information, but these terms are not limited to them and are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.
[0030] Ammonia nitrogen detection in wastewater is one of the core indicators of water quality monitoring. Ammonia nitrogen content reflects the degree of pollution of water bodies by domestic sewage, agricultural runoff, and industrial wastewater. Generally speaking, ammonia nitrogen includes both dissolved ammonia nitrogen (NH3) and free ammonia ions (NH4). + .
[0031] like Figures 1 to 3 As shown in the embodiment of this application, an online ammonia nitrogen analyzer is provided, including a reversible peristaltic pump 1, a quantitative device 2, a valve module 3, a colorimetric device 4, and a distillation device 5. The valve module 3 includes a first valve port 31, a second valve port 32, a sample valve 33, and a colorimetric valve 34. The first valve port 31 is connected to the second valve port 32, and the sample valve 33 and the colorimetric valve 34 are respectively connected to the second valve port 32. The peristaltic pump 1 is connected to the quantitative device 2 through a first pipe 6, the quantitative device 2 is connected to the first valve port 31 through a second pipe 7, the second valve port 32 is connected to the distillation device 5 through a third pipe 8, the distillation device 5 is connected to the colorimetric device 4 through a fourth pipe 9, and the colorimetric device 4 is connected to the colorimetric valve 34 through a fifth pipe 10. The peristaltic pump 1 is used to pump water samples from the sample valve 33 into the quantitative device 2, and also to pump water samples from the quantitative device 2 into the distillation device 5. The distillation device 5 is used to distill ammonia nitrogen from the water sample and deliver it to the colorimetric device 4 for colorimetric analysis.
[0032] In this embodiment, the peristaltic pump 1 rotates forward or reverse under different control commands. When the peristaltic pump 1 rotates forward, it pumps the solution from the valve group module 3 into the metering device 2. When the peristaltic pump 1 rotates in reverse, it pumps the solution from the metering device 2 into the valve group module 3.
[0033] For example, valve module 3 is an eight-way valve or an eight-way valve combination with eight independent control channels or functional modules. Sample valve 33 and colorimetric valve 34 are two of these valves, and either valve can be opened to connect it to the system pipeline.
[0034] Based on the above technical solution, sample valve 33 is opened, colorimetric valve 34 and other valves in valve group module 3 are closed, and peristaltic pump 1 is started. Peristaltic pump 1 rotates forward to pump the wastewater sample to be tested (hereinafter referred to as water sample) from the second valve port 32 through the first valve port 31 into the quantitative device 2 (i.e., pumped from valve group module 3 into quantitative device 2), where quantification is performed. After quantification is completed, sample valve 33 is closed, and peristaltic pump 1 rotates in reverse to pump the water sample from quantitative device 2 through the second valve port 32 into distillation device 5. Inside distillation device 5, ammonia nitrogen is distilled from the water sample and transported to colorimetric device 4. Peristaltic pump 1 rotates forward to pump the reagent used for colorimetry into quantitative device 2. After quantification, colorimetric valve 34 is opened, and peristaltic pump 1 rotates in reverse to pump the reagent into colorimetric device 4 to react with ammonia nitrogen. After the reaction, absorbance is detected in colorimetric device 4 to calculate the ammonia nitrogen concentration in the water sample.
[0035] In this embodiment, before the water sample is pumped into the colorimetric device 4, ammonia nitrogen is separated from the water sample by distillation using the distillation device 5 before spectrophotometric colorimetric determination. This avoids interference from other complex substances in ammonia nitrogen detection, thereby improving the accuracy of ammonia nitrogen detection. This distillation process avoids interference from turbidity, color, metal ions, and organic matter in the water sample, improving the accuracy of ammonia nitrogen detection and making it suitable for the detection of industrial wastewater.
[0036] In some embodiments, such as Figure 2 and Figure 3 As shown, the valve group module 3 also includes multiple reagent valves 36, which are respectively connected to the second valve port 32.
[0037] For example, valve module 3 is an eight-way valve, including a sample valve 33, a colorimetric valve 34, a pure water valve 35, a standard solution valve, and four reagent valves 36. The four reagent valves 36 are designated as a first reagent valve, a second reagent valve, a third reagent valve, and a fourth reagent valve. Before distillation, the first reagent valve is opened to extract dilute acid, and the peristaltic pump 1 is started to pump the dilute acid into the quantitative device 2 for quantitative measurement. The first reagent valve is then closed, and the colorimetric valve 34 is opened to pump the dilute acid into the colorimetric device 4. Then, the colorimetric valve 34 is closed. The second reagent valve is opened to extract sodium hydroxide, and the peristaltic pump 1 is started to pump the sodium hydroxide into the quantitative device 2 for quantitative measurement. The second reagent valve is then closed, and the sodium hydroxide is pumped into the distillation device 5. The distillation device 5 distills ammonia nitrogen from the water sample and delivers it to the colorimetric device 4, where the distilled ammonia nitrogen is absorbed by the dilute acid in the colorimetric device 4. Open the third and fourth reagent valves in sequence to add sodium salicylate and sodium dichloroisocyanurate solutions to colorimetric device 4 to accelerate the colorimetric reaction. After the reaction is complete, perform spectrophotometric colorimetric determination.
[0038] In some embodiments, such as Figure 3 As shown, the distillation apparatus 5 includes a steam oven 51, a distiller 52, and a cooling water system 53. The second valve port 32 is connected to the steam oven 51 through a third pipe 8, and the distiller 52 is installed on a fourth pipe 9. The steam oven 51 is used to convert dissolved ammonia nitrogen and ammonia ions in the water sample into ammonia gas, and the cooling water system 53 is used to convert water vapor in the distiller 52 into liquid water so that ammonia gas can be separated from the liquid water.
[0039] In this embodiment, ammonia nitrogen includes dissolved ammonia nitrogen NH3 and free ammonia ions NH4. + Dissolved ammonia nitrogen can be converted into ammonia gas by heating at high temperature in steam oven 51; free ammonia ions can be converted into ammonia gas by adding reagents.
[0040] Specifically, the steam oven 51 is equipped with a heating wire. The inlet of the still 52 is connected to the steam oven 51, the outlet of the still 52 is connected to the inlet of the still 52, and the outlet of the still 52 is connected to the colorimetric device 4. After the peristaltic pump 1 pumps the water sample into the steam oven 51, the heating wire heats the water sample in the steam oven 51, converting the dissolved ammonia nitrogen and ammonia ions in the water sample into ammonia gas. After the ammonia gas enters the still 52, the cooling water system 53 converts the water vapor in the still 52 into liquid water, so that the ammonia gas is separated from the liquid water. The ammonia gas then enters the colorimetric device 4 for colorimetric reaction.
[0041] In some embodiments, the chilled water system 53 includes a chilled water pump, a chiller, and a circulation pipeline. The chilled water pump is installed on the circulation pipeline, which runs through the distiller 52. After the chiller dispenses chilled water, the chilled water is pressurized by the chilled water pump to circulate in the circulation pipeline. The chilled water in the circulation pipeline condenses ammonia and nitrogen vapor in the distiller 52, causing the temperature to rise. Then, the chilled water returns to the chiller through the circulation pipeline for the next cooling cycle.
[0042] In some embodiments, such as Figure 2 and Figure 3 As shown, the online ammonia nitrogen analyzer also includes a gas pump 11, which is connected to a third pipeline 8. The gas pump 11 is used at least to transport ammonia gas from the steam oven 51 to the distiller 52.
[0043] Specifically, the air inlet of the air pump 11 is connected to the atmosphere, and the air outlet of the air pump 11 is connected to the third pipe 8. During the distillation process, the air pump 11 is started to pressurize and transport the ammonia nitrogen vapor in the steam oven 51 to the distiller 52, thereby accelerating the distillation reaction process of ammonia nitrogen and improving the detection efficiency of ammonia nitrogen.
[0044] In some embodiments, the air pump 11 is also used to continuously blow ambient air into the steam oven 51 after the water sample is distilled, in order to balance the air pressure inside the steam oven 51.
[0045] Specifically, after the water sample is distilled, the steam oven 51 remains under high temperature and high pressure. Air is continuously blown into the steam oven 51 by the air pump 11 to balance the air pressure inside the steam oven 51. Furthermore, the steam oven 51 remains at an extremely high temperature, and the continuous blowing of air by the air pump 11 can also cool the steam oven 51 and accelerate the cooling process.
[0046] In other embodiments, other heat dissipation devices may also be provided, such as heat dissipation devices around the steam oven 51. The heat dissipation devices may be water-cooled devices or air-cooled devices, without specific limitations.
[0047] In some embodiments, such as Figure 2 and Figure 3 As shown, the valve group module 3 also includes a pure water valve 35, which is connected to the second valve port 32.
[0048] Specifically, before pumping the water sample to be tested into the distillation apparatus 5, the system's pipes and devices are cleaned to prevent other impurities from entering and affecting the detection results. During cleaning, the pure water valve 35 is opened, other valves in the valve group module 3 are closed, and the peristaltic pump 1 is started. The peristaltic pump 1 rotates forward to pump pure water from the valve group module 3 into the quantitative device 2. After quantification in the quantitative device 2, the pure water valve 35 is closed, and the peristaltic pump 1 rotates in reverse to pump pure water from the quantitative device 2 through the valve group module 3 into the distillation apparatus 5, thereby cleaning the distillation apparatus 5 and the system pipes. After cleaning, the solution is drained, and then the sample valve 33 is opened, the peristaltic pump 1 is started, and the water sample is pumped into the distillation apparatus 5 according to the above operation to carry out the above distillation and colorimetric reaction process.
[0049] In some embodiments, such as Figure 2 As shown, the online ammonia nitrogen analyzer also includes an injection valve 12 and an exhaust valve group 13. The injection valve 12 has a common end, a normally closed end and a normally open end. The common end of the injection valve 12 is connected to the second valve port 32. The normally closed end of the injection valve 12 is connected to the distillation device 5 through the third pipe 8. The normally open end of the injection valve 12 is connected to the exhaust valve group 13.
[0050] Specifically, the sample inlet valve 12 is a solenoid three-way valve. When the peristaltic pump 1 rotates forward, the normally closed end of the sample inlet valve 12 is closed, and the normally open end is open. At this time, the valve assembly module 3 is not connected to the distillation device 5. When the peristaltic pump 1 rotates in reverse, under the command of the controller, the normally closed end of the sample inlet valve 12 is open, and the normally open end is closed. The peristaltic pump 1 pumps the water sample through the sample inlet valve 12 into the distillation device 5. After distillation, under the command of the controller, the normally closed end of the sample inlet valve 12 is closed, and the normally open end is open. The wastewater sample solution enters the discharge valve assembly 13 from the sample inlet valve 12 and is discharged through the discharge valve assembly 13.
[0051] In some embodiments, such as Figure 3 As shown, the discharge valve assembly 13 includes a waste liquid discharge valve 131 and a wastewater discharge valve 132. The waste liquid discharge valve 131 has a common end, a normally closed end, and a normally open end. The common end of the waste liquid discharge valve 131 is connected to the normally open end of the sample injection valve 12. A waste liquid container is connected to the normally closed end of the waste liquid discharge valve 131. The normally open end of the waste liquid discharge valve 131 is connected to the wastewater discharge valve 132. A wastewater container is connected to the wastewater discharge valve 132.
[0052] In this embodiment, waste liquid discharge valve 131 is used to discharge the water sample solution after distillation, and wastewater discharge valve 132 is used to discharge the pure aqueous solution after cleaning.
[0053] Specifically, after the cleaning system is completed, the normally closed end of the waste liquid discharge valve 131 is closed, and the normally open end is open. The pure aqueous solution flows from the sample inlet valve 12 through the waste liquid discharge valve 131 into the wastewater discharge valve 132, and is then discharged from the wastewater discharge valve 132 into a wastewater container for collection. After distillation, under the controller's command, the normally closed end of the waste liquid discharge valve 131 is opened, and the normally open end is closed. The wastewater sample solution flows from the sample inlet valve 12 through the waste liquid discharge valve 131 into the wastewater discharge valve 132, and is discharged into the waste liquid container for collection. The wastewater sample solution is then treated to meet wastewater treatment standards before being discharged.
[0054] In this embodiment, the waste liquid discharge valve 131 and wastewater discharge valve 132 can be used to collect and treat pure aqueous solution and sewage sample solution separately, thereby reducing the amount of high-concentration waste liquid collected and lowering the cost of sewage treatment.
[0055] In some embodiments, such as Figure 3 As shown, the colorimetric device 4 includes a colorimeter 41 and a heater 42. The heater 42 is located inside the colorimeter 41 or connected to the colorimeter 41 and is used to control the temperature of the colorimeter 41.
[0056] Specifically, the colorimeter 41 includes a colorimetric cell. Ammonia gas from the distiller 52 enters the colorimetric cell of the colorimeter 41 to carry out a colorimetric reaction. A heater 42 is installed inside the colorimeter 41 to control the temperature of the colorimeter 41, thereby controlling the temperature of the colorimetric solution, accelerating the colorimetric reaction, and improving the detection effect. For example, the heater 42 is a heating wire.
[0057] In some embodiments, such as Figure 3 As shown, the online ammonia nitrogen analyzer also includes a waste discharge pump 14, which is connected to the fourth pipeline 9.
[0058] Specifically, during the distillation process, ammonia nitrogen vapor carries some water sample into the distiller 52. The waste pump 14 is turned on to extract this water sample from the fourth pipe 9, preventing it from entering the colorimetric device 4 and improving the accuracy of the detection.
[0059] In one specific embodiment, the ammonia nitrogen detection process is as follows:
[0060] First, open sample valve 33 and start peristaltic pump 1 to draw sample into quantitative device 2 for quantification. Close sample valve 33, open inlet valve 12 to add sample into distillation device 5, and close inlet valve 12 after completion.
[0061] Second, open the first reagent valve and start the peristaltic pump 1 to draw dilute acid into the quantitative device 2 for quantitative measurement. Close the first reagent valve, open the colorimetric valve 34, add the dilute acid into the colorimetric device 4, and close the colorimetric valve 34 after completion.
[0062] Open the second reagent valve and start the peristaltic pump 1 to draw sodium hydroxide solution into the quantitative device 2 for quantitative measurement. Close the first reagent valve, open the injection valve 12, and add the sodium hydroxide solution into the steam oven. After completion, close the injection valve 12.
[0063] Third, turn on the cold water pump, and the distillation apparatus 5 begins heating and distillation. Turn on the air pump 11, and the ammonia nitrogen distilled in the distillation apparatus 5 is carried by the air pump 11 into the dilute acid of the colorimetric apparatus 4 for absorption. After distillation is completed, cool the oven of the distillation apparatus 5. When the oven temperature drops to room temperature, turn off the circulating cooling water, peristaltic pump 1, and air pump 11.
[0064] Fourth, open the third reagent valve and the fourth reagent valve in sequence, and start the peristaltic pump 1 to add sodium salicylate and sodium dichloroisocyanurate solution to the colorimetric device 4 for reaction.
[0065] Fifth, after the reaction is complete, turn on the light source and detector to detect the absorbance of the water sample, and calculate the water sample value according to the standard curve stored in the PLC.
[0066] Sixth, after completing the water sample testing, clean the colorimetric device 4, the distillation device 5, and the pipelines.
[0067] The beneficial effects of this device are:
[0068] First, the online ammonia nitrogen water quality analyzer of this application can analyze dissolved ammonia nitrogen (NH3) and free ammonia ions (NH4) in wastewater. + It separates from complex matrices, converting them into pure ammonia (NH3), which is then absorbed in a dilute acid solution, eliminating the influence of interfering substances on subsequent detection methods (such as Nessler's reagent method and titration). Distillation removes interfering substances such as turbidity, color, metal ions, and organic matter, improving detection accuracy, making it particularly suitable for the detection of industrial wastewater.
[0069] Secondly, the ammonia nitrogen water quality online analyzer of this application achieves full automation of sample addition, pH adjustment, distillation, absorption, and cleaning through logic and flow path control, which improves detection efficiency and realizes online monitoring function without manual intervention.
[0070] Third, the online ammonia nitrogen water quality analyzer of this application uses a micro distillation device to reduce the sample volume (less than 10 mL), reduce reagent consumption, and reduce the distillation time to less than 300 seconds, which greatly reduces the energy consumption of conventional distillation methods.
[0071] It should be understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. It should be noted that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.
[0072] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above descriptions are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. An online ammonia nitrogen analyzer, characterized in that, It includes a reversible peristaltic pump, a metering device, a valve module, a colorimetric device, and a distillation device. The valve module includes a first valve port, a second valve port, a sample valve, and a colorimetric valve. The first valve port is connected to the second valve port, and the sample valve and the colorimetric valve are respectively connected to the second valve port. The peristaltic pump is connected to the metering device through a first pipe, the metering device is connected to the first valve port through a second pipe, the second valve port is connected to the distillation device through a third pipe, the distillation device is connected to the colorimetric device through a fourth pipe, and the colorimetric device is connected to the colorimetric valve through a fifth pipe. The peristaltic pump is used to pump the water sample from the sample valve into the metering device, and also to pump the water sample from the metering device into the distillation device; the distillation device is used to distill ammonia nitrogen from the water sample and deliver it to the colorimetric device for colorimetric analysis.
2. The online ammonia nitrogen analyzer according to claim 1, characterized in that, The distillation apparatus includes a steam oven, a distiller and a cooling water system. The second valve port is connected to the steam oven through the third pipe, and the distiller is installed on the fourth pipe. The steam oven is used to convert dissolved ammonia nitrogen and ammonia ions in the water sample into ammonia gas, and the cold water system is used to convert water vapor in the distiller into liquid water so that the ammonia gas can be separated from the liquid water.
3. The online ammonia nitrogen analyzer according to claim 2, characterized in that, The online ammonia nitrogen analyzer also includes a gas pump, which is connected to the third pipeline. The gas pump is used at least to transport ammonia gas from the steam oven to the distiller.
4. The online ammonia nitrogen analyzer according to claim 3, characterized in that, The air pump is also used to continuously blow ambient air into the steam oven after the water sample is distilled, in order to balance the air pressure inside the steam oven.
5. The online ammonia nitrogen analyzer according to claim 1, characterized in that, The valve group module also includes a pure water valve, which is connected to the second valve port.
6. The online ammonia nitrogen analyzer according to claim 5, characterized in that, The online ammonia nitrogen analyzer also includes an inlet valve and an outlet valve assembly. The inlet valve has a common end, a normally closed end, and a normally open end. The common end of the inlet valve is connected to the second valve port. The normally closed end of the inlet valve is connected to the distillation device through the third pipeline. The normally open end of the inlet valve is connected to the outlet valve assembly.
7. The online ammonia nitrogen analyzer according to claim 6, characterized in that, The discharge valve assembly includes a waste liquid discharge valve and a wastewater discharge valve. The waste liquid discharge valve has a common end, a normally closed end, and a normally open end. The common end of the waste liquid discharge valve is connected to the normally open end of the sample injection valve. A waste liquid container is connected to the normally closed end of the waste liquid discharge valve. The normally open end of the waste liquid discharge valve is connected to the wastewater discharge valve, and a wastewater container is connected to the wastewater discharge valve.
8. The online ammonia nitrogen analyzer according to claim 1, characterized in that, The colorimetric device includes a colorimeter and a heater. The heater is located inside the colorimeter or connected to the colorimeter and is used to control the temperature of the colorimeter.
9. The online ammonia nitrogen analyzer according to claim 1, characterized in that, The online ammonia nitrogen analyzer also includes a waste discharge pump, which is connected to the fourth pipeline.
10. The online ammonia nitrogen analyzer according to any one of claims 1 to 9, characterized in that, The valve assembly module also includes multiple reagent valves, each of which is connected to the second valve port.