An on-line detecting device for chlorine ion concentration in an absorption tower

Abstract

The application discloses an online detection device for chlorine ion concentration of an absorption tower, which comprises a tower body, a sampling device connected with the tower body and used for sampling pulp samples in the tower body, a detection device connected with the sampling device, an analysis processing module signal-connected with the sampling device and the detection device, and a sample recovery device connected with the analysis processing module and used for recovering the sample and cleaning the detection device. The application provides the online detection device for the chlorine ion concentration of the absorption tower. The pulp samples in the absorption tower are detected by a PH value detection device and a chlorine ion concentration detection device, and the hardware equipment of the device is sent with instructions to drive each link to work according to the detection results. The application has a short detection period, can timely find the excessive chlorine ion concentration, can implement specific response methods according to the change when the PH value and the chlorine ion concentration are detected, and thus the damage of the chlorine ion to the inside of the absorption tower is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of online detection technology, more particularly to an online chloride concentration detection device for an absorption tower. BACKGROUND

[0002] In the limestone-gypsum wet flue gas desulfurization process of a thermal power plant, 0.01%-0.2% of chlorine elements contained in coal enter the desulfurization device with flue gas after combustion, and the chloride ions gradually accumulate in the absorption slurry due to the recycling of water in the desulfurization device, which can cause the chloride ion concentration of the absorption tower slurry to seriously exceed the standard. The chloride ion concentration exceeding the standard of the absorption tower not only causes damage and corrosion to the system equipment corrosion prevention, causes the desulfurization efficiency to decrease and the gypsum scaling tendency to increase, but also affects the quality of gypsum and increases the plant power consumption rate, which seriously affects the safe, stable and economic operation of the desulfurization device.

[0003] In view of the problem of chloride ion concentration exceeding the standard of the absorption tower, the conventional measures and methods mainly take the sampling of the laboratory, and the chemical method of silver nitrate precipitation is used to determine the concentration in the sample. In the implementation process, the cycle is long, the labor is large, and the chloride ion concentration cannot be found in time when it is excessive, which can easily cause damage to the inside of the absorption tower by chloride ions. Therefore, an online chloride concentration detection device for an absorption tower is urgently needed. SUMMARY

[0004] Therefore, the present application provides an online chloride concentration detection device for an absorption tower.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] An online chloride concentration detection device for an absorption tower, characterized in that it comprises a tower body.

[0007] A sampling device connected to the bottom end of the tower body for obtaining a slurry sample inside the tower body.

[0008] A detection device connected to the sampling device for detecting the pH value and chloride ion concentration of the sample.

[0009] An analysis processing module signal connected to the sampling device and the detection device for controlling the operation of the sampling device and analyzing and processing the detection results.

[0010] A sample recovery device connected to the analysis processing module for recovering the sample.

[0011] Preferably, in the above-mentioned online chloride concentration detection device for an absorption tower, the tower body is internally provided with a slurry pool and an air inlet channel.

[0012] Detection holes are arranged on the two side walls below the tower body.

[0013] Preferably, in the above-mentioned online detection device for chloride ion concentration in absorption tower, the sampling device comprises:

[0014] A sampling pipeline is fixedly connected to the detection holes on the two sides of the tower body, and the liquid extraction end of the sampling pipeline penetrates through the detection holes and extends to the bottom of the slurry;

[0015] A sampling cylinder is fixedly connected to the liquid discharge end of one of the sampling pipelines, and a recovery valve is arranged at the bottom end of the sampling cylinder, which is connected to the sample recovery device; a liquid level sensor is arranged on the inner wall of the sampling cylinder.

[0016] An electromagnetic valve is arranged between the sampling pipeline and the sampling cylinder.

[0017] Preferably, in the above-mentioned online detection device for chloride ion concentration in absorption tower, the detection device comprises:

[0018] A pH sensor is fixedly connected to the top end of the sampling cylinder, and the bottom end contacts the slurry sample;

[0019] A chloride ion concentration detection unit is arranged inside the sampling cylinder, which comprises: a probe arranged at the bottom of the sampling cylinder for contacting the slurry sample; and a chloride ion concentration sensor connected to the probe, which obtains the chloride ion concentration value of the slurry sample according to the data collected by the probe.

[0020] Preferably, in the above-mentioned online detection device for chloride ion concentration in absorption tower, the analysis and processing module comprises:

[0021] A database is connected to the pH sensor, the chloride ion concentration sensor and the liquid level sensor, and receives and stores the pH data, the chloride ion concentration data and the liquid level data; the database contains preset pH data range, chloride ion concentration data range and liquid level data range;

[0022] An analysis unit compares the detection results of different parameters in the database with the preset parameter range, and generates an alarm instruction according to the analysis result; the analysis unit obtains the liquid level data of the liquid level sensor in real time, and generates a liquid delivery instruction according to the liquid level data;

[0023] A processor is signal-connected to the analysis unit for receiving the alarm instruction and the liquid level instruction; the processor is connected to the electromagnetic valve.

[0024] A pH alarm is signal-connected to the processor, which is provided with a correct alarm lamp, a high-acid alarm lamp and a high-alkali alarm lamp.

[0025] a chlorine ion concentration alarm connected to the processor, provided with a correct alarm lamp and an error alarm lamp;

[0026] the alarm instruction comprises:

[0027] the detected PH value data is A, and the preset PH value data range is between A and A;

[0028] the detected chlorine ion concentration data is B, and the preset chlorine ion concentration data range is between B and B;

[0029] when A < A < A, the analysis unit sends a first-level instruction to the processor; when A < A, the analysis unit sends a second-level instruction to the processor; and when A > A, the analysis unit sends a third-level instruction to the processor;

[0030] when B < B < B or B < B, the analysis unit sends a fourth-level instruction to the processor; and when B > B, the analysis unit sends a fifth-level instruction to the processor;

[0031] the infusion instruction comprises:

[0032] the detected liquid level data is C, and the preset liquid level data is between C and C;

[0033] when C < C, the analysis unit sends a sixth-level instruction to the processor; and when C < C < C or C > C, the analysis unit sends a seventh-level instruction to the processor.

[0034] Preferably, in the above-mentioned absorption tower chlorine ion concentration online detection device, when the processor receives the first-level instruction, the correct alarm lamp of the PH value alarm is driven to light up, and the recovery valve is driven to open;

[0035] when the processor receives the second-level instruction, the high-acid alarm lamp of the PH value alarm is driven to light up, and the recovery valve is driven to open;

[0036] when the processor receives the third-level instruction, the high-alkali alarm lamp of the PH value alarm is driven to light up, and the recovery valve is driven to open;

[0037] when the processor receives the fourth-level instruction, the correct alarm lamp of the chlorine ion concentration alarm is driven to light up, and the recovery valve is driven to open;

[0038] when the processor receives the fifth-level instruction, the error alarm lamp of the chlorine ion concentration alarm is driven to light up, and the recovery valve is driven to open;

[0039] The processor drives the electromagnetic valve to open and drives the recovery valve to close when receiving the sixth level instruction;

[0040] The processor drives the electromagnetic valve to close and drives the recovery valve to close when receiving the seventh level instruction.

[0041] Preferably, in the above-mentioned online detection device for chloride ion concentration in absorption tower, the sample recovery device comprises:

[0042] An absorption tower drainage pit is arranged below the detection device to receive the detected slurry sample, and a recovery pipeline II is arranged between the absorption tower drainage pit and the tower body;

[0043] A recovery pipeline I has its liquid inlet end connected to the corresponding side recovery valve and its liquid outlet end arranged inside the absorption tower drainage pit;

[0044] A filter assembly is arranged in the recovery pipeline I to filter the slurry sample through a filter screen;

[0045] A recovery pump is arranged inside the recovery pipeline II and is controlled to act through a liquid level interlocking assembly; the liquid level interlocking assembly comprises a liquid level sensor II, a liquid level detector and an alarm display, the liquid level sensor II and the liquid level detector are respectively arranged inside the absorption tower drainage pit and the tower body and are connected in circuit with the alarm display to realize advanced alarm for high and low liquid levels in the absorption tower drainage pit and the tower body; the recovery pump is connected with the alarm display and is driven to work when the slurry inside the absorption tower drainage pit reaches a specified value;

[0046] A flushing assembly is arranged above the sampling cylinder and comprises a water tank, a high-pressure pump and a nozzle; a flushing pipeline is arranged between the water tank and the nozzle, and the nozzle penetrates through the top plate of the sampling cylinder; the flushing assembly is electrically connected with the recovery valve and works synchronously with the recovery valve.

[0047] Preferably, in the above-mentioned online detection device for chloride ion concentration in absorption tower, the tower body further comprises:

[0048] A concentration reduction device is connected in signal with the processor; the concentration reduction device comprises a dosing tank and an electromagnetic valve II, and silver nitrate crystals are arranged in the dosing tank; the processor is driven to close the electromagnetic valve II when receiving a fourth level instruction, and the processor is driven to open the electromagnetic valve II when receiving a fifth level instruction to dose silver nitrate crystals into the slurry pool to react with hydrogen chloride in the slurry to generate silver chloride precipitate and nitric acid;

[0049] The PH value adjusting device is connected with the processor, and the PH value reducing device is arranged at the bottom of the slurry and comprises a dosing tank one, a dosing tank two, a valve one and a valve two; when the processor receives the first-level instruction, the valve remains closed; when the processor receives the second-level instruction, the valve one is driven to open to release the alkaline solution in the dosing tank one; when the processor receives the first-level instruction, the valve one is closed again; when the processor receives the third-level instruction, the valve two is driven to open to release the acidic solution in the dosing tank two; when the processor receives the first-level instruction, the valve one is closed again.

[0050] Preferably, in the above-mentioned absorption tower chloride ion concentration on-line detection device, the database draws a function curve diagram of the detection results of the same parameter, and displays the function curve diagram through the display screen; the increasing and decreasing trends of the chloride ion concentration and the PH value in the absorption tower are predicted by calculating the slope of the curve.

[0051] The process of the present application is as follows: first, the electromagnetic valve is opened, the slurry sample in the slurry pool is transported to the sampling cylinder along the sampling pipeline, and the electromagnetic valve is closed when the liquid level in the sampling cylinder reaches the standard; the PH value sensor detects the sample in the sampling cylinder to obtain PH value data; the chloride ion concentration detection unit detects the chloride ion concentration of the sample through the probe and the chloride ion concentration sensor to obtain chloride ion concentration data; the database receives the PH value data, the chloride ion concentration data and the liquid level data in the sampling cylinder; the analysis unit compares the PH value data, the chloride ion concentration data and the liquid level data in the sampling cylinder with the preset data range in the database respectively, and sends alarm instructions and liquid level instructions to the processor according to the comparison results; the processor controls the working state of the PH alarm, the chloride ion concentration alarm, the extraction pump, the recovery valve and the recovery pump according to the instructions, so as to realize on-line detection of the chloride ion concentration; after the detection process is completed, the recovery valve is opened to flow the sample in the sampling cylinder into the absorption tower drainage pit, and the recovery pump is driven by the liquid level interlocking to transport the slurry sample in the absorption tower drainage pit back to the slurry pool; the processor controls the reducing concentration device and the PH adjusting device according to the alarm instructions, so as to reduce the chloride ion concentration in the slurry pool and adjust the PH value.

[0052] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a device for online detection of chloride ion concentration in an absorption tower. The present invention uses a pH value detection device and a chloride ion concentration detection device to detect slurry samples in the absorption tower, and sends instructions to the hardware of the device according to the detection results to drive the operation of each link, thereby achieving the effect of online detection. The present invention has a short detection cycle and requires no manual labor during implementation. It can detect excessive chloride ion concentration in a timely manner. When changes in pH value and chloride ion concentration are detected, specific countermeasures can be implemented to address the changes, thereby avoiding damage to the inside of the absorption tower caused by chloride ions. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0054] Figure 1 The attached figure is a schematic diagram of the structure of the present invention;

[0055] Figure 2 The attached figure is a schematic diagram of the process of this invention;

[0056] Figure 3 The attached figure is a flowchart of the sample recovery device of the present invention;

[0057] Figure 4 The attached figure is a flowchart of the present invention, the concentration reduction device, and the pH adjustment device.

[0058] In the diagram: 1. Tower body; 2. Sampling pipeline; 3. Solenoid valve; 4. Sampling cylinder; 5. Recovery valve; 6. Recovery pipeline one; 7. Filter assembly; 9. Recovery pump; 10. Absorption tower drainage pit; 11. Recovery pipeline two; 20. Water tank; 21. High-pressure pump; 22. Nozzle. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] In the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, cannot be understood as a limitation on the present application.

[0062] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] Embodiment 1:

[0064] The present embodiment provides an online detection device for chloride ion concentration in an absorption tower, as shown in the figure, comprising a tower body 1; Figure 1

[0065] Connected to the bottom end of the tower body 1, used to obtain the slurry sample inside the tower body 1;

[0066] Detection device, connected to the sampling device, used to detect the PH value and chloride ion concentration of the sample;

[0067] Analysis processing module, signal connected to the sampling device and detection device, used to control the working of the sampling device and analyze and process the detection results;

[0068] Sample recovery device, connected to the analysis processing module, used to recover the sample.

[0069] ​The principle of the technical scheme is: based on the structure of the absorption tower, combining the PH detection device, the chloride ion concentration detection device, the database, the analysis unit, the processing unit and the recovery device, the dispersed subsystems are organically interconnected to establish an integrated system of operation, detection, analysis, operation and feedback.

[0070] The beneficial effects of the technical scheme are: the detection period is short during the implementation of the application, no labor is needed, the chloride ion concentration can be detected in time when it is excessive, and specific response methods can be implemented according to the changes in the PH value and the chloride ion concentration, thereby avoiding damage to the inside of the absorption tower caused by chloride ions.

[0071] Embodiment 2:

[0072] The embodiment provides an absorption tower chloride ion concentration online detection device, as shown in the drawing, the inside of the tower body 1 is provided with a slurry pool and an air inlet channel. Figure 1

[0073] The detection holes are provided with two, which are respectively arranged on the two side walls below the tower body 1.

[0074] The principle of the technical scheme is: the slurry water entering the recovery water pool is classified by the waste water cyclone, and the dilute liquid is treated by adding chemicals and discharged. The slurry water entering the recovery water pool is respectively the top flow of the gypsum cyclone, the filter liquid drainage of the belt dewatering machine steam-water separator, the filter liquid drainage of the belt dewatering machine steam-water separator, and the weir drainage of the belt dewatering machine. According to the structure of the existing absorption tower, the structure is improved.

[0075] The beneficial effects of the technical scheme are: the technology of the application is more suitable for the widely used absorption tower.

[0076] Embodiment 3:

[0077] The embodiment provides an absorption tower chloride ion concentration online detection device, as shown in the drawing, the inside of the tower body 1 is provided with a slurry pool and an air inlet channel. Figure 1

[0078] The sampling pipeline 2 is fixedly connected to the detection holes on the two sides of the tower body 1, and the liquid suction end of the sampling pipeline 2 penetrates through the detection holes and extends to the bottom of the slurry;

[0079] The sampling cylinder 4 is fixedly connected to the liquid discharge end of one of the sampling pipelines 2, and the bottom end is provided with a recovery valve 5 connected to a sample recovery device; the inner wall of the sampling cylinder 4 is provided with a liquid level sensor 1.

[0080] The electromagnetic valve 3 is arranged between the sampling pipeline 2 and the sampling cylinder 4.

[0081] The principle of the technical scheme is: by extracting the sample in the slurry pool into the sampling cylinder, an environment is provided for the detection process of the two parameters.​​

[0082] The beneficial effects of the technical solution are: reducing the errors that are prone to occur when detecting two parameters of a sample.

[0083] Embodiment 4:

[0084] The embodiment provides an online detection device for chloride ion concentration in an absorption tower, as shown in the figure, the detection device comprises: Figure 1

[0085] A pH sensor is fixedly connected to the top end of the sampling cylinder 4, and the bottom end contacts the slurry sample;

[0086] A chloride ion concentration detection unit is arranged in the sampling cylinder 4, and comprises: a probe arranged at the bottom of the sampling cylinder 4 and used for contacting the slurry sample; and a chloride ion concentration sensor connected to the probe, which obtains the chloride ion concentration value of the slurry sample according to the data collected by the probe.

[0087] The principle of the technical solution is that the chloride ion sensor is prior art, which is an instrument for dry analysis of chloride ion content. Its main features are convenient use, automatic operation, high sensitivity and selectivity. The chloride ion detector adopts an ion selective electrode method, and through the professional software and chemical anti-interference reagents provided, the water-soluble chloride ion content of inorganic materials such as concrete, sand, stone, cement and mixed water is quickly determined at room temperature, so as to achieve the purpose of preventing premature corrosion of concrete steel bars. The chloride ion content determination instrument is light in weight, small in size, convenient for users to carry, and suitable for on-site detection.

[0088] It adopts an electrode method principle, digitally displays the value of chloride ion, does not need reagent, automatically converts the reading value into milligrams per liter, automatically calibrates three points, automatically latches the current value after the reading is stable, and the minimum reading of the instrument is 0.1 milligrams per liter. The chloride ion selective electrode first opens the discharge valve and the cleaning valve at the same time, the chloride ion detector allows the cleaning liquid to clean the reaction pool for a set time. After the cleaning valve is closed, the sample valve is opened, and the discharge valve is opened for a few seconds at this time, the sample water is used to wash away the residual cleaning liquid drops. Then the discharge valve is closed, and the siphon is automatically adjusted to the sample volume. At this time, the stirring pump is activated and works for a set time. Finally, the values of the ion selective potential and the ion concentration are displayed.

[0089] ​PH sensors are known in the art and include a reference electrode, a glass electrode whose potential depends on the pH of the surrounding solution, and a galvanometer capable of measuring small potential differences in a highly resistive circuit. The BPHSCAN series of waterproof pen-type pH meters includes 10 / 20 / 30 three models, the instrument is suitable for measuring non-high temperature, non-corrosive liquid pH value due to the use of the latest electrode design and solid circuit technology, now the best PH meter acidity meter can distinguish 0.005 pH unit. The basic function of the reference electrode is to maintain a constant potential as a control for measuring various deviations. The silver-silver oxide electrode is the most commonly used reference electrode in the PH meter | acidity meter. The function of the glass electrode is to establish a potential difference that responds to changes in the hydrogen ion activity of the measured solution. Put the pH-sensitive electrode and the reference electrode in the same solution to form a primary cell, the potential of the cell is the algebraic sum of the potential of the glass electrode and the reference electrode. E cell = E reference + E glass, if the temperature is constant, the potential of this cell changes with the pH value of the solution to be measured, and it is difficult to measure the potential generated by the cell in the PH meter acidity meter, because the electromotive force is very small, and the impedance of the circuit is very large 1-100MΩ; Therefore, the signal must be amplified to be sufficient to drive the standard millivolt meter or milliammeter. The function of the galvanometer is to amplify the potential of the primary cell several times, and the amplified signal is displayed through the meter, and the degree of deflection of the meter pointer indicates the strength of the signal it drives, for the needs of use, the pH meter acidity meter ammeter dial is marked with corresponding pH value; And the digital PH meter acidity meter directly displays the pH value in numbers.

[0090] The beneficial effects of the technical solution are: through the detection of the existing mature chloride ion concentration sensor and PH value sensor, the detection result is more accurate, and the detection speed is faster.

[0091] Embodiment 5:

[0092] The embodiment provides an absorption tower chloride ion concentration on-line detection device, as shown in Figure 1 The analysis processing module includes:

[0093] The database is connected with the PH value sensor, the chloride ion concentration sensor and the liquid level sensor one, receives and stores the PH value data, the chloride ion concentration data and the liquid level data; The database contains preset PH value data range, chloride ion concentration data range and liquid level data range;

[0094] The analysis unit compares the detection results of different parameters in the database with the preset parameter range respectively, and generates an alarm instruction according to the analysis result; The analysis unit obtains the liquid level data of the liquid level sensor one in real time, and generates a transfusion instruction according to the liquid level data;

[0095] A processor, which is signal-connected to an analysis unit and is used to receive an alarm instruction and a liquid level instruction; the processor is connected to a solenoid valve 3;

[0096] A pH value alarm, which is signal-connected to the processor and is provided with a correct alarm lamp, a high acid alarm lamp and a high alkali alarm lamp;

[0097] A chloride ion concentration alarm, which is signal-connected to the processor and is provided with a correct alarm lamp and an error alarm lamp;

[0098] The alarm instruction includes:

[0099] Suppose the detected pH value data is A, and the preset pH value data range is between A0 and A1;

[0100] Suppose the detected chloride ion concentration data is B, and the preset chloride ion concentration data range is between B0 and B1;

[0101] When it is determined that A0 < A < A1, the analysis unit sends a first-level instruction to the processor; when it is determined that A < A0, the analysis unit sends a second-level instruction to the processor; when it is determined that A > A1, the analysis unit sends a third-level instruction to the processor;

[0102] When it is determined that B0 < B < B1 or B < B0, the analysis unit sends a fourth-level instruction to the processor; when it is determined that B > B1, the analysis unit sends a fifth-level instruction to the processor;

[0103] The infusion instruction includes:

[0104] Suppose the detected liquid level data is C, and the preset liquid level data is between C0 and C1;

[0105] When it is determined that C < C0, the analysis unit sends a sixth-level instruction to the processor; when it is determined that C0 < C < C1 or C > C1, the analysis unit sends a seventh-level instruction to the processor.

[0106] The principle of this technical solution is: receiving detection data through a database and making a determination according to the preset data in the database; using instructions at different levels to drive the working states of each hardware device.

[0107] The beneficial effect of this technical solution is: realizing real-time online detection, avoiding the problems of long cycle, slow time and large labor volume brought by manual sampling detection, and ensuring the reaction speed when each hardware receives an instruction.

[0108] Example 6:

[0109] This embodiment provides an online detection device for the chloride ion concentration in an absorption tower, as Figure 1As shown, when the processor receives the first level instruction, it drives the correct alarm light of the PH value alarm to light up and drives the recovery valve 5 to open;

[0110] When the processor receives the second level instruction, it drives the high acid alarm light of the PH value alarm to light up and drives the recovery valve 5 to open;

[0111] When the processor receives the third level instruction, it drives the high alkali alarm light of the PH value alarm to light up and drives the recovery valve 5 to open;

[0112] When the processor receives the fourth level instruction, it drives the correct alarm light of the chloride ion concentration alarm to light up and drives the recovery valve 5 to open;

[0113] When the processor receives the fifth level instruction, it drives the error alarm light of the chloride ion concentration alarm to light up and drives the recovery valve 5 to open;

[0114] When the processor receives the sixth level instruction, it drives the electromagnetic valve 3 to open and drives the recovery valve 5 to close;

[0115] When the processor receives the seventh level instruction, it drives the electromagnetic valve 3 to close and drives the recovery valve 5 to close.

[0116] The beneficial effects of the technical solution are: through the first level, second level, third level, fourth level, fifth level, sixth level and seventh level instructions to control the working state of the recovery valve, alarm and extraction pump, the reliability and transparency of the system are improved.

[0117] Embodiment 7:

[0118] The embodiment provides an online chloride ion concentration detection device for an absorption tower, as shown in the accompanying drawings. Figure 1 As shown, the sample recovery device comprises:

[0119] An absorption tower drainage pit 10 is arranged below the detection device and is used for receiving the detected slurry sample, and a recovery pipeline two 11 is arranged between the absorption tower drainage pit 10 and the tower body;

[0120] A recovery pipeline one 6 is connected to the corresponding side recovery valve 5 at the liquid inlet end and is arranged inside the absorption tower drainage pit 10 at the liquid outlet end;

[0121] A filter assembly 7 is arranged in the recovery pipeline one 6 and filters the slurry sample through a filter screen;

[0122] A recovery pump 9 is arranged in the recovery pipeline 11 and is controlled by the liquid level interlocking assembly. The liquid level interlocking assembly includes a liquid level sensor 2, a liquid level detector and an alarm display. The liquid level sensor 2 and the liquid level detector are arranged in the absorption tower drainage pit 10 and the tower body 1 respectively and are connected with the alarm display in circuit to realize advanced alarm for high and low liquid levels of the absorption tower drainage pit 10 and the tower body 1. The recovery pump 9 is connected with the alarm display. When the slurry in the absorption tower drainage pit 10 reaches a specified value, the recovery pump is driven to work.

[0123] A flushing assembly is arranged above the sampling cylinder 4 and includes a water tank 20, a high-pressure pump 21 and a nozzle 22. A flushing pipeline 23 is arranged between the water tank and the nozzle. The nozzle penetrates the top plate of the sampling cylinder 4. The flushing assembly is electrically connected with the recovery valve 5 and works synchronously with the recovery valve 5.

[0124] The beneficial effects of the technical solution are that the recovery pump is added to the recovery pipeline. The recovery pump is driven to work by the instructions received by the processor to realize the purpose of returning the slurry sample to the slurry pool.

[0125] Embodiment 8:

[0126] The embodiment provides an absorption tower chloride ion concentration on-line detection device, as shown in the drawing, the tower body 1 further includes: Figure 1

[0127] A concentration reduction device is connected with the processor in signal. The concentration reduction device includes a dosing tank and an electromagnetic valve 2. Silver nitrate crystals are arranged in the dosing tank. When the processor receives the fourth instruction, the electromagnetic valve 2 is driven to be closed. When the processor receives the fifth instruction, the electromagnetic valve 2 is driven to be opened to put the silver nitrate crystals into the slurry pool to react with hydrogen chloride in the slurry to generate silver chloride precipitate and nitric acid.

[0128] A PH value adjusting device is connected with the processor in signal. The PH value adjusting device is arranged at the bottom of the slurry and includes a dosing tank 1, a dosing tank 2, a valve 1 and a valve 2. When the processor receives the first instruction, the valve is kept closed. When the processor receives the second instruction, the valve 1 is driven to be opened to release the alkaline solution in the dosing tank 1. When the processor receives the first instruction, the valve 1 is restored to be closed. When the processor receives the third instruction, the valve 2 is driven to be opened to release the acidic solution in the dosing tank 2. When the processor receives the first instruction, the valve 1 is restored to be closed.

[0129] The principle of the technical solution is that the silver nitrate crystals are easily dissolved in water. The silver nitrate crystals react with chloride ions in the slurry pool to generate silver chloride precipitate and nitric acid.

[0130] Ag++Cl-==AgCl↓;

[0131] Taking hydrogen chloride contained in the slurry as an example, the reaction formula is:​

[0132] AgNO3 + HCl → HNO3 + AgCl↓; a precipitate is then formed, which needs to be cleaned regularly by staff after precipitation.

[0133] The reactions between alkaline and acidic solutions are existing technologies, both involving the chemical reaction of hydrogen ions. The composition of the two solutions is not fixed, as long as they meet the requirements of alkalinity and acidity.

[0134] The beneficial effects of this technical solution are: by adding silver nitrate crystals, alkaline solution and acidic solution to the slurry tank, chloride ions can be effectively precipitated and the pH value during the precipitation process can be neutralized.

[0135] Example 9:

[0136] This embodiment provides an online detection device for chloride ion concentration in an absorption tower, such as... Figure 1 As shown, the database plots a function curve of the detection results for the same parameter and displays the function curve on the screen; by calculating the slope of the curve, it predicts the increasing or decreasing trend of chloride ion concentration and pH value in the absorption tower.

[0137] The beneficial effects of this technical solution are: by calculating the slope and steepness of the function curve graph, the trend of chloride ion concentration and pH value in the absorption tower can be predicted, and the time of exceeding the standard can be predicted.

[0138] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0139] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An online detection device for chloride ion concentration in an absorption tower, characterized in that, Including the tower body (1); A sampling device is connected to the bottom of the tower body (1) and is used to obtain slurry samples inside the tower body (1); A detection device, connected to the sampling device, is used to detect the pH value and chloride ion concentration of the sample; An analysis and processing module is connected to the sampling device and the detection device by signal, and is used to control the operation of the sampling device and to analyze and process the detection results. A sample recovery device, connected to the analysis and processing module, is used to recover the sample; The tower body (1) is equipped with a slurry pool and an air inlet channel inside; The detection holes are set on the two side walls below the tower body (1); The sampling device includes: The sampling pipeline (2) has its liquid extraction section fixedly connected to the detection holes on both sides of the tower body (1), and the liquid extraction end of the sampling pipeline (2) passes through the detection hole and extends to the bottom of the slurry; The sampling cylinder (4) has its top end fixedly connected to the drain end of one of the sampling pipes (2), and its bottom end is provided with a recovery valve (5), which is connected to the sample recovery device; a liquid level sensor is provided on the inner wall of the sampling cylinder (4). A solenoid valve (3) is disposed between the sampling pipeline (2) and the sampling cylinder (4); The detection device includes: A pH sensor is fixedly connected to the top of the sampling tube (4) at its top and its bottom is in contact with the slurry sample at its bottom. A chloride ion concentration detection unit is set inside the sampling tube (4), and includes: a probe, which is set at the bottom of the sampling tube (4) for contacting the slurry sample; and a chloride ion concentration sensor, which is connected to the probe and obtains the chloride ion concentration value of the slurry sample based on the data collected by the probe. The analysis and processing module includes: The database connects the pH sensor, the chloride ion concentration sensor, and the liquid level sensor, and receives and stores pH data, chloride ion concentration data, and liquid level data; the database contains preset pH data ranges, chloride ion concentration data ranges, and liquid level data ranges. The analysis unit compares the detection results of different parameters in the database with preset parameter ranges and generates alarm commands based on the analysis results; the analysis unit acquires the liquid level data of the liquid level sensor in real time and generates infusion commands based on the liquid level data. The processor is signal-connected to the analysis unit and is used to receive alarm commands and infusion commands; the processor is connected to the solenoid valve (3). A pH alarm is connected to the processor and is equipped with a correct alarm light, a high acid alarm light, and a high alkali alarm light. A chloride ion concentration alarm, whose signal is connected to the processor, is equipped with a correct alarm light and an incorrect alarm light; The alarm instructions include: Let the detected pH value be A, and the preset pH value range be between A0 and A1; Let the detected chloride ion concentration data be B, and the preset chloride ion concentration data range be between B0 and B1; When it is determined that A0 < A < A1, the analysis unit sends a first-level instruction to the processor; when it is determined that A < A0, the analysis unit sends a second-level instruction to the processor; when it is determined that A > A1, the analysis unit sends a third-level instruction to the processor; When it is determined that B0 < B < B1 or B < B0, the analysis unit sends a fourth-level instruction to the processor; when it is determined that B > B1, the analysis unit sends a fifth-level instruction to the processor; The infusion instruction includes: Let the detected liquid level data be C, and the preset liquid level data is between C0 and C1; When it is determined that C < C0, the analysis unit sends a sixth-level instruction to the processor; when it is determined that C0 < C < C1 or C > C1, the analysis unit sends a seventh-level instruction to the processor.

2. The online detection device for chloride ion concentration in an absorption tower according to claim 1, characterized in that, When the processor receives the first-level instruction, it drives the correct alarm light of the pH value alarm to light up and drives the recovery valve (5) to open; When the processor receives the second-level instruction, it drives the high-acid alarm light of the pH value alarm to light up and drives the recovery valve (5) to open; When the processor receives the third-level instruction, it drives the high-alkali alarm light of the pH value alarm to light up and drives the recovery valve (5) to open; When the processor receives the fourth-level instruction, it drives the correct alarm light of the chloride ion concentration alarm to light up and drives the recovery valve (5) to open; When the processor receives the fifth-level instruction, it drives the error alarm light of the chloride ion concentration alarm to light up and drives the recovery valve (5) to open; When the processor receives the sixth-level instruction, it drives the solenoid valve (3) to open and drives the recovery valve (5) to close; When the processor receives the seventh-level instruction, it drives the solenoid valve (3) to close and drives the recovery valve (5) to close.

3. The online detection device for chloride ion concentration in an absorption tower according to claim 2, characterized in that, The sample recovery device includes: The absorption tower drainage pit (10) is arranged below the detection device and is used to receive the detected slurry sample. A second recovery pipeline (11) is arranged between the absorption tower drainage pit (10) and the tower body; The first recovery pipeline (6), its liquid inlet end is connected to the corresponding side of the recovery valve (5), and the liquid outlet end is arranged inside the absorption tower drainage pit (10); The filtering component (7) is arranged in the first recovery pipeline (6) and filters the slurry sample through a filter screen; The recovery pump (9) is arranged inside the second recovery pipeline (11) and its operation is controlled by a liquid level interlock component; the liquid level interlock component includes a second liquid level sensor, a liquid level detector and an alarm display. The second liquid level sensor and the liquid level detector are respectively installed inside the absorption tower drainage pit (10) and the tower body (1) and are connected to the alarm display through a circuit to realize the advanced alarm of the high and low liquid levels of the absorption tower drainage pit (10) and the tower body (1); the recovery pump (9) is connected to the alarm display and drives the recovery pump to work when the slurry inside the absorption tower drainage pit (10) reaches a specified value; The rinsing assembly is located above the sampling cylinder (4) and includes a water tank (20), a high-pressure pump (21), and a nozzle (22); a rinsing pipeline (23) is provided between the water tank and the nozzle, and the nozzle passes through the top plate of the sampling cylinder (4); the rinsing assembly is electrically connected to the recovery valve (5) and works synchronously with the recovery valve (5).

4. The online detection device for chloride ion concentration in an absorption tower according to claim 2, characterized in that, The interior of the tower body (1) also includes: A concentration reduction device is connected to the processor via a signal. The concentration reduction device includes a dosing tank and a second solenoid valve. Silver nitrate crystals are placed inside the dosing tank. When the processor receives a level 4 instruction, it drives the second solenoid valve to close. When the processor receives a level 5 instruction, it drives the second solenoid valve to open, adding silver nitrate crystals into the slurry tank, causing them to react with hydrogen chloride in the slurry to generate silver chloride precipitate and nitric acid. A pH adjustment device is connected to the processor via a signal connection. The pH adjustment device is located at the bottom of the slurry and includes a dosing tank 1, a dosing tank 2, a valve 1, and a valve 2. When the processor receives a first-level command, the valves remain closed. When the processor receives a second-level command, it drives valve 1 to open, releasing the alkaline solution in dosing tank 1. When the processor receives the first-level command again, valve 1 closes again. When the processor receives a third-level command, it drives valve 2 to open, releasing the acidic solution in dosing tank 2. When the processor receives the first-level command again, valve 1 closes again.

5. The online detection device for chloride ion concentration in an absorption tower according to claim 1, characterized in that, The database plots the detection results of the same parameter into a function curve; and displays the function curve on a screen; by calculating the slope of the curve, it predicts the increasing or decreasing trend of chloride ion concentration and pH value in the absorption tower.

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