Device and method for on-line measurement of chloride ions in sewage of urea hydrolyzer

Abstract

The invention discloses a device and a method for on-line measurement of chloride ions in sewage of a urea hydrolyzer, an outlet of a first sampling valve is communicated with a reaction center through a coil cooler, a filter tube, a cation exchange column and a reverse osmosis unit in sequence, and a luminescent tube is arranged on one side in the reaction center; a color sensor is arranged on the other side in the reaction center; an outlet of the second demineralized water reagent bottle, an outlet of the phenolphthalein indicator reagent bottle, an outlet of the nitric acid solution reagent bottle, an outlet of the sodium hydroxide solution reagent bottle, an outlet of the potassium chromate solution reagent bottle and an outlet of the silver nitrate standard solution reagent bottle are communicated with an inlet of the multi-channel switching valve, and an outlet of the multi-channel switching valve is communicated with the reaction center; according to the device and the method, the chloride ion concentration in the sewage of the urea hydrolyzer can be measured on line.

Description

Technical Field

[0001] The invention belongs to the technical field of online measurement in the field of urea hydrolysis, and relates to a device and method for online measurement of chloride ions in sewage liquid of a urea hydrolyzer. Background Art

[0002] In recent years, urea hydrolysis to produce ammonia has become the mainstream technical route for urea ammonia production in coal-fired units. Due to the quality problem of urea raw materials, the urea effluent has a high salt content and is easy to crystallize, causing pipeline blockage. At present, due to the accumulation of chlorides in the actual operation of the urea hydrolyzer, a large amount of chloride ions can cause pitting corrosion of 316L stainless steel, affecting the safe and stable operation of the denitrification system. Therefore, the control of chloride ions in the urea hydrolysis process is particularly important. At present, the detection of chloride ions in the urea hydrolyzer effluent includes molar method, point titration method, spectrophotometry method, electrode method and ion chromatography method. At present, the molar method, point titration method and spectrophotometry method all require the use of silver nitrate standard solution for testing. The test step needs to be mixed with hydrogen exchange resin to eliminate NH4 + The ion exchange resin is easily contaminated by organic matter, resulting in NH4 + The removal rate is reduced, NH4 + The reaction with silver ions to form a silver ammonium complex consumes the silver nitrate standard solution, resulting in an inflated measurement result. Ion chromatography is expensive, and most companies lack the testing conditions, preventing large-scale application. Furthermore, all five methods require laboratory testing, which requires taking water samples from the site and returning them to the lab for testing. These methods are unable to detect chloride ion concentrations in wastewater in a timely manner.

[0003] Therefore, there is an urgent need to develop a highly accurate device and solution for online measurement of chloride ions in the urea hydrolyzer effluent. Timely and accurate detection of chloride ion content provides accurate and effective data support for solutions to corrosion in the flue gas denitrification urea hydrolysis process system. Summary of the Invention

[0004] The object of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a device and method for online measurement of chloride ions in the wastewater of a urea hydrolyzer. The device and method can measure the chloride ion concentration in the wastewater of a urea hydrolyzer online.

[0005] To achieve the above-mentioned object, the present invention discloses a device for online measurement of chloride ions in urea hydrolyzer wastewater, comprising a first sampling valve, a coil cooler, a filter tube, a cation exchange column, a reverse osmosis device, a reaction center, a second desalted water reagent bottle, a phenolphthalein indicator reagent bottle, a nitric acid solution reagent bottle, a sodium hydroxide solution reagent bottle, a potassium chromate solution reagent bottle, a silver nitrate standard solution reagent bottle, and a multi-channel switching valve;

[0006] The outlet of the first sampling valve is connected to the reaction center through a coil cooler, a filter tube, a cation exchange column and a reverse osmosis device in sequence. A light-emitting tube is provided on one side of the reaction center, and a color sensor is provided on the other side of the reaction center.

[0007] The outlet of the second desalted water reagent bottle, the outlet of the phenolphthalein indicator reagent bottle, the outlet of the nitric acid solution reagent bottle, the outlet of the sodium hydroxide solution reagent bottle, the outlet of the potassium chromate solution reagent bottle and the outlet of the silver nitrate standard solution reagent bottle are connected to the inlet of the multi-channel switching valve, and the outlet of the multi-channel switching valve is connected to the reaction center.

[0008] The device for online measurement of chloride ions in urea hydrolyzer wastewater of the present invention is further improved in that:

[0009] Furthermore, the outlet of the first sampling valve is connected to the reaction center via the coil cooler, the second sampling valve, the filter tube, the third sampling valve, the cation exchange column, the sixth sampling valve, the reverse osmosis device, and the seventh sampling valve in sequence.

[0010] Furthermore, a temperature sensor is included, which is arranged on the coil cooler 2.

[0011] Furthermore, the sulfuric acid solution reagent bottle is connected to the cation exchange column via a fourth sampling valve.

[0012] Furthermore, the first deionized water reagent bottle is connected to the cation exchange column via a fifth sampling valve.

[0013] Furthermore, it also includes a controller, which is connected to the first sampling valve, the temperature sensor, the second sampling valve, the third sampling valve, the fourth sampling valve, the fifth sampling valve, the sixth sampling valve, the seventh sampling valve, the reaction center, the injection pump, the multi-channel switching valve, the light-emitting tube and the color sensor.

[0014] Furthermore, the cation exchange column is a color-changing strong acid cation resin exchange column.

[0015] Furthermore, the first sampling valve is provided before the sewage valve of the urea hydrolyzer.

[0016] Furthermore, the controller is connected to an alarm.

[0017] The present invention discloses a method for online measurement of chloride ions in urea hydrolyzer wastewater, comprising the following steps:

[0018] Control the first sampling valve to open, and the liquid flows into the coil cooler; after a preset time, close the first sampling valve, start the second sampling valve, and the liquid flows into the filter tube to filter solid particles; after a preset time, close the second sampling valve, start the third sampling valve to open, and the liquid flows into the cation exchange column; after a preset time, close the third sampling valve, start the sixth sampling valve, and the liquid flows into the reverse osmosis device; after a preset time, close the sixth sampling valve, start the seventh sampling valve, and the liquid flows into the reaction center;

[0019] The deionized water output from the second deionized water reagent bottle enters the reaction center through the syringe pump for sufficient mixing to complete automatic dilution. The syringe pump adds the phenolphthalein indicator in the phenolphthalein indicator reagent bottle to the reaction center through the multi-channel switching valve. The light-emitting tube is turned on. When the color sensor detects that the color of the reaction center is colorless, the syringe pump adds the sodium hydroxide solution in the sodium hydroxide solution reagent bottle to the reaction center through the multi-channel switching valve. When the color sensor detects that the color of the reaction center changes from colorless to red, the syringe pump drops the nitric acid solution in the nitric acid solution reagent bottle into the reaction center through the multi-channel switching valve. When the color sensor detects that the color changes from red to colorless, the syringe pump drops the potassium chromate solution in the potassium chromate solution reagent bottle into the reaction center through the multi-channel switching valve. Then, the syringe pump drops the silver nitrate standard solution in the silver nitrate standard solution reagent bottle into the reaction center through the multi-channel switching valve. When the color sensor detects that the color of the solution in the reaction center changes from yellow to brick red, the addition amount of the silver nitrate standard solution is calculated.

[0020] The controller calculates the chloride ion concentration in the urea wastewater according to the added amount of the silver nitrate standard solution.

[0021] The present invention has the following beneficial effects:

[0022] The device and method for online measurement of chloride ions in urea hydrolyzer wastewater disclosed by the present invention are as follows: during specific operation, the wastewater is pretreated by a coil cooler, a filter tube, a cation exchange column, and a reverse osmosis device to avoid influence on detection; a second desalted water reagent bottle, a phenolphthalein indicator reagent bottle, a nitric acid solution reagent bottle, a sodium hydroxide solution reagent bottle, a potassium chromate solution reagent bottle, and a silver nitrate standard solution reagent bottle are switched by a multi-channel switching valve for automatic liquid inlet; and a color sensor is used to determine the liquid inlet endpoint to achieve automatic control; finally, the chloride ion concentration in the urea wastewater is calculated according to the added amount of the silver nitrate standard solution, thereby achieving the purpose of online measurement of the chloride ion concentration in the urea hydrolyzer wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 This is a control principle diagram of the present invention.

[0026] Among them, 1 is the first sampling valve, 2 is the coil cooler, 3 is the temperature sensor, 4 is the second sampling valve, 5 is the filter tube, 6 is the third sampling valve, 7 is the cation exchange column, 8 is the fourth sampling valve, 9 is the sulfuric acid solution reagent bottle, 10 is the fifth sampling valve, 11 is the first desalted water reagent bottle, 12 is the sixth sampling valve, 13 is the reverse osmosis device, 14 is the seventh sampling valve, 15 is the reaction center, 16 is the injection pump, 17 is the multi-channel switching valve, 18 is the controller, 15-1 is the light-emitting tube, 15-2 is the color sensor, 17-1 is the second desalted water reagent bottle, 17-2 is the phenolphthalein indicator reagent bottle, 17-3 is the nitric acid solution reagent bottle, 17-4 is the sodium hydroxide solution reagent bottle, 17-5 is the potassium chromate solution reagent bottle, and 17-6 is the silver nitrate standard solution reagent bottle. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of the present invention, it is to be understood that the terms “include” and “comprise” indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0029] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0030] It should be further understood that the term "and / or" as used in the present specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0031] It should be understood that although the terms "first," "second," and "third" may be used to describe preset ranges in embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0032] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0035] Example 1

[0036] refer to Figure 1 and Figure 2The device for online measurement of chloride ions in urea hydrolyzer wastewater of the present invention includes a first sampling valve 1, a coil cooler 2, a temperature sensor 3, a second sampling valve 4, a filter tube 5, a third sampling valve 6, a cation exchange column 7, a fourth sampling valve 8, a sulfuric acid solution reagent bottle 9, a fifth sampling valve 10, a first desalted water reagent bottle 11, a sixth sampling valve 12, a reverse osmosis device 13, a seventh sampling valve 14, a reaction center 15, a syringe pump 16, a multi-channel switching valve 17, a controller 18, a light-emitting tube 15-1, a color sensor 15-2, a second desalted water reagent bottle 17-1, a phenolphthalein indicator reagent bottle 17-2, a nitric acid solution reagent bottle 17-3, a sodium hydroxide solution reagent bottle 17-4, a potassium chromate solution reagent bottle 17-5, and a silver nitrate standard solution reagent bottle 17-6;

[0037] The outlet of the first sampling valve 1 is connected to the reaction center 15 in sequence through the coil cooler 2, the second sampling valve 4, the filter tube 5, the third sampling valve 6, the cation exchange column 7, the sixth sampling valve 12, the reverse osmosis 13, and the seventh sampling valve 14. The temperature sensor 3 is arranged on the coil cooler 2, the sulfuric acid solution reagent bottle 9 is connected to the cation exchange column 7 through the fourth sampling valve 8, and the first desalted water reagent bottle 11 is connected to the cation exchange column 7 through the fifth sampling valve 10; a light-emitting tube 15-1 is provided on one side of the reaction center 15, and a color sensor 15-2 is provided on the other side of the reaction center 15.

[0038] The outlet of the second desalted water reagent bottle 17-1, the outlet of the phenolphthalein indicator reagent bottle 17-2, the outlet of the nitric acid solution reagent bottle 17-3, the outlet of the sodium hydroxide solution reagent bottle 17-4, the outlet of the potassium chromate solution reagent bottle 17-5 and the outlet of the silver nitrate standard solution reagent bottle 17-6 are connected to the inlet of the multi-channel switching valve 17, and the outlet of the multi-channel switching valve 17 is connected to the reaction center 15.

[0039] The controller 18 is connected to the first sampling valve 1, the temperature sensor 3, the second sampling valve 4, the third sampling valve 6, the fourth sampling valve 8, the fifth sampling valve 10, the sixth sampling valve 12, the seventh sampling valve 14, the reaction center 15, the injection pump 16, the multi-channel switching valve 17, the light-emitting tube 15-1 and the color sensor 15-2. The controller 1 controls the operation of the first sampling valve 1, the temperature sensor 3, the second sampling valve 4, the third sampling valve 6, the fourth sampling valve 8, the fifth sampling valve 10, the sixth sampling valve 12, the seventh sampling valve 14, the reaction center 15, the injection pump 16, the multi-channel switching valve 17, the light-emitting tube 15-1 and the color sensor 15-2.

[0040] The coil cooler 2 is an automatic cleaning coil cooler.

[0041] The filter tube 5 is an automatic cleaning filter.

[0042] The cation exchange column 7 is a color-changing strong acid cation resin exchange column.

[0043] The reverse osmosis device 13 is an automatic cleaning reverse osmosis device.

[0044] The first sampling valve 1 is arranged before the drain valve of the urea hydrolyzer.

[0045] The controller 18 is connected to an alarm for sounding an alarm when the measured chloride ion concentration is too high.

[0046] The first sampling valve 1 , the second sampling valve 4 , the third sampling valve 6 , the fourth sampling valve 8 , the fifth sampling valve 10 , the sixth sampling valve 12 , and the seventh sampling valve 14 are all electric valves.

[0047] Example 2

[0048] refer to Figure 1 and Figure 2 The present invention discloses a method for online measurement of chloride ions in urea hydrolyzer wastewater. The method for online measurement of chloride ions in urea hydrolyzer wastewater is implemented based on the system for online measurement of chloride ions in urea hydrolyzer wastewater. The device for online measurement of chloride ions in urea hydrolyzer wastewater includes a first sampling valve 1, a coil cooler 2, a temperature sensor 3, a second sampling valve 4, a filter tube 5, a third sampling valve 6, a cation exchange column 7, a fourth sampling valve 8, a sulfuric acid solution reagent bottle 9, and a fifth sampling valve. 10, a first desalted water reagent bottle 11, a sixth sampling valve 12, a reverse osmosis device 13, a seventh sampling valve 14, a reaction center 15, a syringe pump 16, a multi-channel switching valve 17, a controller 18, a light-emitting tube 15-1, a color sensor 15-2, a second desalted water reagent bottle 17-1, a phenolphthalein indicator reagent bottle 17-2, a nitric acid solution reagent bottle 17-3, a sodium hydroxide solution reagent bottle 17-4, a potassium chromate solution reagent bottle 17-5, and a silver nitrate standard solution reagent bottle 17-6. The specific connection relationship is as shown in the first embodiment;

[0049] Specifically, the method for online measurement of chloride ions in urea hydrolyzer wastewater comprises the following steps:

[0050] Control the first sampling valve 1 to open, and the liquid flows into the coil cooler 2. After 5 minutes, the first sampling valve 1 is closed. When the temperature measured by the temperature sensor 3 is less than Y degrees, the second sampling valve 4 is activated, and the liquid flows into the filter tube 5 to filter solid particles. After 5 minutes, the second sampling valve 4 is closed, and the third sampling valve 6 is activated and opened, and the liquid flows into the cation exchange column 7. After 5 minutes, the third sampling valve 6 is closed, and the sixth sampling valve 12 is activated, and the liquid flows into the reverse osmosis device 13. After 5 minutes, the sixth sampling valve 12 is closed, and the seventh sampling valve 14 is activated, and the liquid flows into the reaction center 15. The deionized water output from the second deionized water reagent bottle 17-1 enters the reaction center 15 through the injection pump 16 and is fully mixed for 2 minutes to complete automatic dilution. The syringe pump 16 adds the phenolphthalein indicator in the phenolphthalein indicator reagent bottle 17-2 to the reaction center 15 and stirs it evenly through the multi-channel switching valve 17; the light-emitting tube 15-1 is turned on, and when the color sensor 15-2 detects that the color of the reaction center 15 is colorless, the syringe pump 16 adds the sodium hydroxide solution in the sodium hydroxide solution reagent bottle 17-4 to the reaction center 15 and stirs it evenly through the multi-channel switching valve 17; when the color sensor 15-2 detects that the color of the reaction center 15 changes from colorless to red, the syringe pump 16 adds the nitric acid solution reagent bottle 17-5 to the reaction center 15 through the multi-channel switching valve 17. -3 is added dropwise to the reaction center 15, and when the color sensor 15-2 detects that the color changes from red to colorless, the potassium chromate solution in the potassium chromate solution reagent bottle 17-5 is added dropwise to the reaction center 15 by the injection pump 16 through the multi-channel switching valve 17 and stirred evenly, and then the silver nitrate standard solution in the silver nitrate standard solution reagent bottle 17-6 is added dropwise to the reaction center 15 by the injection pump 16 through the multi-channel switching valve 17. When the color sensor 15-2 detects that the color of the reaction center 15 changes from yellow to brick red, it is the end point, and the amount of silver nitrate standard solution added is calculated.

[0051] The controller 18 calculates the chloride ion concentration in the urea wastewater according to the amount of the silver nitrate standard solution added.

[0052] Then, the fourth sampling valve 8 is opened, and the sulfuric acid solution in the sulfuric acid solution reagent bottle 9 is dripped into the cation exchange column 7 for regeneration. After 20 minutes, the fourth sampling valve 8 is closed, and the fifth sampling valve 10 is opened. The deionized water in the first deionized water reagent bottle 11 is dripped into the cation exchange column 7 for cleaning, completing the regeneration of the cation exchange column 7. The syringe pump 16 automatically cleans the second deionized water reagent bottle 17-1 through the multi-channel switching valve 17. After cleaning, the syringe pump 16, coil cooler 2, filter tube 5, and reverse osmosis device 13 are closed, completing the automatic cleaning and completing the chloride ion detection.

[0053] It should be noted that the present invention has a simple structure and can realize an automated measurement process. The present invention can conveniently realize the online measurement of chloride ions in the sewage liquid of the urine hydrolyzer without manual intervention.

[0054] Those skilled in the art will readily identify other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0055] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0056] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A device for online measurement of chloride ions in urea hydrolyzer wastewater, characterized in that: The invention comprises a first sampling valve (1), a coil cooler (2), a filter tube (5), a cation exchange column (7), a reverse osmosis device (13), a reaction center (15), a second desalted water reagent bottle (17-1), a phenolphthalein indicator reagent bottle (17-2), a nitric acid solution reagent bottle (17-3), a sodium hydroxide solution reagent bottle (17-4), a potassium chromate solution reagent bottle (17-5), a silver nitrate standard solution reagent bottle (17-6), and a multi-channel switching valve (17); The outlet of the first sampling valve (1) is connected to the reaction center (15) through the coil cooler (2), the filter tube (5), the cation exchange column (7) and the reverse osmosis device (13) in sequence. A light-emitting tube (15-1) is provided on one side of the reaction center (15), and a color sensor (15-2) is provided on the other side of the reaction center (15); The outlet of the second desalted water reagent bottle (17-1), the outlet of the phenolphthalein indicator reagent bottle (17-2), the outlet of the nitric acid solution reagent bottle (17-3), the outlet of the sodium hydroxide solution reagent bottle (17-4), the outlet of the potassium chromate solution reagent bottle (17-5) and the outlet of the silver nitrate standard solution reagent bottle (17-6) are connected to the inlet of the multi-channel switching valve (17), and the outlet of the multi-channel switching valve (17) is connected to the reaction center (15).

2. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 1, characterized in that: The outlet of the first sampling valve (1) is connected to the reaction center (15) through the coil cooler (2), the second sampling valve (4), the filter tube (5), the third sampling valve (6), the cation exchange column (7), the sixth sampling valve (12), the reverse osmosis device (13), and the seventh sampling valve (14) in sequence.

3. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 2, characterized in that: It also includes a temperature sensor (3), which is arranged on the coil cooler (2).

4. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 3, characterized in that: The sulfuric acid solution reagent bottle (9) is connected to the cation exchange column (7) via the fourth sampling valve (8).

5. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 4, characterized in that: The first deionized water reagent bottle (11) is connected to the cation exchange column (7) via the fifth sampling valve (10).

6. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 5, characterized in that: The device further comprises a controller (18), which is connected to the first sampling valve (1), the temperature sensor (3), the second sampling valve (4), the third sampling valve (6), the fourth sampling valve (8), the fifth sampling valve (10), the sixth sampling valve (12), the seventh sampling valve (14), the reaction center (15), the injection pump (16), the multi-channel switching valve (17), the light-emitting tube (15-1) and the color sensor (15-2).

7. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 1, characterized in that: The cation exchange column (7) is a color-changing strong acid cation resin exchange column.

8. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 1, characterized in that: The first sampling valve (1) is arranged before the sewage discharge valve of the urea hydrolyzer.

9. The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 6, characterized in that: The controller (18) is connected to an alarm.

10. A method for online measurement of chloride ions in urea hydrolyzer wastewater, characterized in that: The device for online measurement of chloride ions in urea hydrolyzer wastewater according to claim 1 comprises the following steps: The first sampling valve (1) is controlled to open, and the liquid flows into the coil cooler (2). After a preset time, the first sampling valve (1) is closed, and the second sampling valve (4) is started, and the liquid flows into the filter tube (5) to filter solid particles. After a preset time, the second sampling valve (4) is closed, and the third sampling valve (6) is started and opened, and the liquid flows into the cation exchange column (7). After a preset time, the third sampling valve (6) is closed, and the sixth sampling valve (12) is started, and the liquid flows into the reverse osmosis device (13). After a preset time, the sixth sampling valve (12) is closed, and the seventh sampling valve (14) is started, and the liquid flows into the reaction center (15); The deionized water output from the second deionized water reagent bottle (17-1) enters the reaction center (15) through the syringe pump (16) for full mixing and automatic dilution. The syringe pump (16) adds the phenolphthalein indicator in the phenolphthalein indicator reagent bottle (17-2) to the reaction center (15) through the multi-channel switching valve (17); the light-emitting tube (15-1) is turned on, and when the color sensor (15-2) detects that the color of the reaction center (15) is colorless, the syringe pump (16) adds the sodium hydroxide solution in the sodium hydroxide solution reagent bottle (17-4) to the reaction center (15) through the multi-channel switching valve (17); when the color sensor (15-2) detects that the color of the reaction center (15) changes from colorless to red, the syringe pump (16) turns on. (16) adding the nitric acid solution in the nitric acid solution reagent bottle (17-3) to the reaction center (15) through the multi-channel switching valve (17), and when the color sensor (15-2) detects that the color changes from red to colorless, the potassium chromate solution in the potassium chromate solution reagent bottle (17-5) is added to the reaction center (15) through the multi-channel switching valve (17), and then the silver nitrate standard solution in the silver nitrate standard solution reagent bottle (17-6) is added to the reaction center (15) through the syringe pump (16) through the multi-channel switching valve (17), and when the color sensor (15-2) detects that the color of the solution in the reaction center (15) changes from yellow to brick red, the amount of the silver nitrate standard solution added is calculated; The controller (18) calculates the chloride ion concentration in the urea wastewater according to the amount of the silver nitrate standard solution added.

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