A desulfurization wastewater Cl - Online detection and intelligent emission control system

Abstract

This application discloses desulfurization wastewater Cl ‑ The online detection and intelligent emission control system includes a desulfurization wastewater pre-precipitation device, a dilution device, a filtering device and a detection and calculation device connected in sequence to the desulfurization wastewater pre-precipitation device. The desulfurization wastewater pre-precipitation device is used to remove solids in the desulfurization wastewater, the dilution device is used to dilute the desulfurization wastewater, the filtering device is used to filter the desulfurization wastewater, and the detection and calculation device is used to detect Cl in the desulfurization wastewater. ‑ The concentration is converted into electrical signals and transmitted to the DCS system. It is also used to calculate the Cl ‑ The concentration is calculated to calculate the desulfurization wastewater discharge volume, and converted into electrical signals for transmission to the DCS system. The DCS system performs intelligent discharge control of desulfurization wastewater based on the desulfurization wastewater discharge volume, enabling power plant operators to monitor the Cl in desulfurization wastewater in real time. ‑ concentration, calculate the optimal desulfurization wastewater discharge, so that Cl ‑ The concentration is maintained within the optimal range, improving the economy and safety of unit operation.

Description

Technical Field

[0001] The invention belongs to the technical field of pollutant emission control of coal-fired power plants, and particularly relates to a desulfurization wastewater Cl - Online detection and intelligent emission control system. Background Art

[0002] The limestone-gypsum wet desulfurization process is widely used in my country. Its technical route is generally as follows: in the absorption tower, limestone slurry is sprayed downward from the spray layer nozzle, contacts with the flue gas in the countercurrent upward flow and absorbs the sulfur dioxide in the flue gas to generate calcium sulfite, which is converted into calcium sulfate dihydrate under the oxidation action of the oxidizing wind. In order to maintain the material balance in the absorption tower and ensure the healthy operation of the equipment in the absorption tower, the absorption tower needs to discharge a certain amount of desulfurization wastewater. Among them, this desulfurization wastewater belongs to the high-salt wastewater at the end of the coal-fired power plant, which is characterized by complex wastewater composition, high solid content, high salt content, and Cl - High concentration and high hardness. Nowadays, people pay more and more attention to environmental protection. The discharge of desulfurization wastewater and Cl - control becomes increasingly important.

[0003] Since desulfurization wastewater has the above characteristics, the Cl - The detection is generally carried out manually by the chemical team of the power plant. The defects of this manual detection method include: low automation of sampling and detection, long sampling and pretreatment time, complex process, long detection cycle, inability to realize online detection, serious lag in detection values, and inconsistency between detection values ​​and on-site operation conditions. The detection values ​​have little guiding significance for on-site operation. In addition, the discharge of desulfurization wastewater from power plants is determined by the operation of the units and the Cl content of desulfurization wastewater. - The existing desulfurization wastewater discharge method of power plants is generally irregular, that is, the discharge interval is irregular and the wastewater discharge volume is irregular. The defect of this desulfurization wastewater discharge method is that when the wastewater discharge volume is insufficient, the Cl in the wastewater - The concentration is relatively high, which affects the desulfurization efficiency of the absorption tower, the operation of instruments and equipment, the dehydration of gypsum at the back end, and the quality of gypsum, which is not conducive to the stable operation of the unit; when the wastewater discharge is too much, the water replenishment volume of the absorption tower increases, the gypsum oxidation crystallization effect is poor, the gypsum dehydration is difficult, the processing volume of the back-end equipment increases, the wastewater treatment costs increase, and the operating costs increase, which is not conducive to the economic operation of the unit. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a desulfurization wastewater Cl - Online detection and intelligent emission control systems enable power plant operators to monitor Cl in desulfurization wastewater in real time. - concentration, helping power plant operators calculate the optimal desulfurization wastewater discharge volume, so that the Cl- The concentration is maintained within the optimal range, reducing the workload of power plant inspectors and laboratory personnel, and improving the economy and safety of unit operation.

[0005] The present invention provides a desulfurization wastewater Cl - The online detection and intelligent emission control system includes a desulfurization wastewater pre-precipitation device connected to a desulfurization wastewater sampling port, and a dilution device, a filtering device and a detection and calculation device connected to the desulfurization wastewater pre-precipitation device in sequence, wherein the desulfurization wastewater pre-precipitation device is used to remove solids from the desulfurization wastewater, the dilution device is used to dilute the desulfurization wastewater, the filtering device is used to filter the desulfurization wastewater, the detection and calculation device is used to detect the Cl- concentration in the desulfurization wastewater and convert it into an electrical signal for transmission to a DCS system connected to the detection and calculation device, and is also used to calculate the current desulfurization wastewater discharge amount according to the Cl- concentration in the DCS system, and convert it into an electrical signal for transmission to the DCS system, and the DCS system is used to perform intelligent emission control of desulfurization wastewater according to the current desulfurization wastewater discharge amount.

[0006] Preferably, in the above-mentioned desulfurization wastewater Cl- online detection and intelligent emission control system, it also includes a flue gas analyzer installed at the inlet flue of the absorption tower, which is used to detect the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower and then convert it into an electrical signal of the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower and transmit the electrical signal of the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower to the DCS system connected to the flue gas analyzer, and the detection and calculation device is used to retrieve the electrical signal of the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower from the DCS system and combine the collected electrical signal of the chloride ion concentration of the desulfurization wastewater, the electrical signal of the flue gas volume at the inlet of the absorption tower and the electrical signal of the operating liquid level of the absorption tower to calculate the next detection time of the desulfurization wastewater, so as to perform intelligent emission control of the desulfurization wastewater.

[0007] Preferably, in the above-mentioned desulfurization wastewater Cl- online detection and intelligent emission control system, the desulfurization wastewater pre-sedimentation device includes an inlet control gate connected to the desulfurization wastewater sampling port and a desulfurization wastewater pre-sedimentation tank connected to the inlet control gate, the desulfurization wastewater pre-sedimentation tank is connected to the dilution device through an outlet electric door, and the bottom of the desulfurization wastewater pre-sedimentation tank is also provided with a sewage discharge electric door, and the upper part is also provided with a liquid level meter.

[0008] Preferably, in the above-mentioned desulfurization wastewater Cl- online detection and intelligent emission control system, the dilution device includes a dilution tank connected to the outlet electric door, the upper part of the dilution tank is provided with a dilution water electric door, the dilution water electric door is connected to the dilution water manual door through a flow meter, and the lower part of the dilution tank is provided with a dilution tank sewage electric door.

[0009] Preferably, in the above-mentioned desulfurization wastewater Cl- online detection and intelligent emission control system, the filtering device is a self-cleaning quartz sand filter, a mechanical filter or a membrane filter.

[0010] Preferably, in the above-mentioned desulfurization wastewater Cl- online detection and intelligent emission control system, the detection and calculation device includes a test water tank connected to the filtering device and a water quality analyzer connected to the water in the test water tank, and the lower part of the test water tank is provided with a test water tank sewage electric door.

[0011] Preferably, in the above-mentioned desulfurization wastewater Cl- online detection and intelligent emission control system, the entrance control door includes an entrance manual door connected to the desulfurization wastewater sampling port and an entrance electric door connected to the other end of the entrance manual door.

[0012] Preferably, in the above desulfurization wastewater Cl - In the online detection and intelligent emission control system, the desulfurization wastewater sampling port includes a gypsum cyclone overflow port, a wastewater cyclone overflow, a desulfurization tower sewage pipe or a desulfurization tower overflow pipe.

[0013] From the above description, it can be seen that the desulfurization wastewater Cl provided by the present invention - The online detection and intelligent emission control system comprises a desulfurization wastewater pre-precipitation device connected to a desulfurization wastewater sampling port, and a dilution device, a filtering device and a detection and calculation device connected in sequence to the desulfurization wastewater pre-precipitation device, wherein the desulfurization wastewater pre-precipitation device is used to remove solids from the desulfurization wastewater, the dilution device is used to dilute the desulfurization wastewater, the filtering device is used to filter the desulfurization wastewater, and the detection and calculation device is used to detect Cl in the desulfurization wastewater. - The concentration is converted into an electrical signal and transmitted to a DCS system connected to the detection and calculation device, and is also used to calculate the Cl in the DCS system. - The concentration of desulfurization wastewater is calculated and converted into electrical signals for transmission to the DCS system. The DCS system is used to perform intelligent emission control of desulfurization wastewater according to the desulfurization wastewater emission, so that the power plant operators can monitor the Cl in the desulfurization wastewater in real time. - concentration, helping power plant operators calculate the optimal desulfurization wastewater discharge volume, so that the Cl - The concentration is maintained within the optimal range, reducing the workload of power plant inspectors and laboratory personnel, and improving the economy and safety of unit operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0015] Figure 1 A desulfurization wastewater Cl provided by the present invention - A schematic diagram of an embodiment of an online detection and intelligent emission control system;

[0016] Figure 2 Desulfurization wastewater Cl - A schematic diagram of a specific embodiment of an online detection and intelligent emission control system. DETAILED DESCRIPTION

[0017] The core of the present invention is to provide a desulfurization wastewater Cl - Online detection and intelligent emission control systems enable power plant operators to monitor Cl in desulfurization wastewater in real time. - concentration, helping power plant operators calculate the optimal desulfurization wastewater discharge volume, so that the Cl - The concentration is maintained within the optimal range, reducing the workload of power plant inspectors and laboratory personnel, and improving the economy and safety of unit operation.

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention provides a desulfurization wastewater Cl - Online detection and implementation of intelligent emission control systems such as Figure 1 As shown, Figure 1 A desulfurization wastewater Cl provided by the present invention - Schematic diagram of an embodiment of an online detection and intelligent emission control system, the system includes a desulfurization wastewater pre-precipitation device 101 connected to a desulfurization wastewater sampling port, and a dilution device 102, a filtering device 103 and a detection and calculation device 104 connected to the desulfurization wastewater pre-precipitation device 101 in sequence, the desulfurization wastewater pre-precipitation device 101 is used to remove solids in the desulfurization wastewater, the dilution device 102 is used to dilute the desulfurization wastewater, the filtering device 103 is used to filter the desulfurization wastewater, and the detection and calculation device 104 is used to detect Cl in the desulfurization wastewater. -concentration, and convert it into an electrical signal and transmit it to the DCS system connected to the detection and calculation device. It is also used to calculate the Cl - The concentration is used to calculate the amount of desulfurization wastewater discharged this time, and the result is converted into an electrical signal and transmitted to the DCS system. The DCS system is used to perform intelligent emission control of desulfurization wastewater based on the amount of desulfurization wastewater discharged this time.

[0020] It should be noted that the above-mentioned desulfurization wastewater includes but is not limited to desulfurization slurry in the absorber, overflow slurry from the absorber, sewage slurry from the absorber, desulfurization wastewater in the absorber, gypsum cyclone overflow wastewater, gypsum cyclone underflow wastewater, wastewater cyclone overflow wastewater and wastewater cyclone underflow wastewater, etc. The discharge amount of desulfurization wastewater can be calculated using the following formula:

[0021]

[0022] V n ——Calculate the discharge volume of desulfurization wastewater when the chloride ion concentration of desulfurization wastewater is detected for the nth time, unit: m 3 ;

[0023] h n ——The operating liquid level of the absorption tower during the nth detection, unit: m;

[0024] c n ——Chloride ion concentration of desulfurization wastewater at the nth time, mg / L;

[0025] c min ——Lower limit of the control range of chloride ion concentration in desulfurization wastewater, unit: mg / L;

[0026] c m ——Chloride ion concentration of process water, unit: mg / L;

[0027] Among them, when c n <c min When V n The value is 0.

[0028] This desulfurization wastewater Cl - After the online detection and intelligent emission control system is put into operation, accurate and online detection of Cl in desulfurization wastewater can be achieved. - concentration, intelligently calculate the desulfurization wastewater discharge, so that the desulfurization wastewater Cl - The concentration is maintained within the optimal range, reducing the workload of inspectors and laboratory personnel and improving the safety and economy of the unit.

[0029] From the above description, it can be seen that the desulfurization wastewater Cl provided by the present invention -The online detection and intelligent emission control system comprises a desulfurization wastewater pre-precipitation device connected to a desulfurization wastewater sampling port, and a dilution device, a filtering device and a detection and calculation device connected in sequence to the desulfurization wastewater pre-precipitation device. The desulfurization wastewater pre-precipitation device is used to remove solids from the desulfurization wastewater, the dilution device is used to dilute the desulfurization wastewater, the filtering device is used to filter the desulfurization wastewater, and the detection and calculation device is used to detect Cl in the desulfurization wastewater. - The concentration is converted into an electrical signal and transmitted to the DCS system connected to the detection and calculation device. It is also used to calculate the Cl concentration in the DCS system. - The concentration is calculated to calculate the desulfurization wastewater discharge volume, and converted into electrical signals for transmission to the DCS system. The DCS system is used to perform intelligent discharge control of desulfurization wastewater based on the desulfurization wastewater discharge volume, so that the power plant operators can monitor the Cl in the desulfurization wastewater in real time. - concentration, helping power plant operators calculate the optimal desulfurization wastewater discharge volume, so that the Cl - The concentration is maintained within the optimal range, reducing the workload of power plant inspectors and laboratory personnel, and improving the economy and safety of unit operation.

[0030] refer to Figure 2 , Figure 2 Desulfurization wastewater Cl - A schematic diagram of a specific embodiment of an online detection and intelligent emission control system, in the above desulfurization wastewater Cl - In a specific embodiment of the online detection and intelligent emission control system, it can also include a flue gas analyzer 18 installed at the absorption tower inlet flue 17, which is used to detect the hydrogen chloride concentration of the flue gas at the absorption tower inlet and then convert it into an electrical signal of the hydrogen chloride concentration of the flue gas at the absorption tower inlet and transmit the electrical signal of the hydrogen chloride concentration of the flue gas at the absorption tower inlet to a DCS system connected to the flue gas analyzer 18. The above-mentioned detection and calculation device is used to retrieve the electrical signal of the hydrogen chloride concentration of the flue gas at the absorption tower inlet from the DCS system and combine the collected electrical signal of the chloride ion concentration of the desulfurization wastewater, the electrical signal of the flue gas volume at the absorption tower inlet and the electrical signal of the operating liquid level of the absorption tower to calculate the next detection time of the desulfurization wastewater, and perform intelligent emission control of the desulfurization wastewater. That is to say, this detection time interval fluctuates with the real-time operation of the unit, which is more intelligent.

[0031] Specifically, the calculation method for the next detection time of the above desulfurization wastewater can be as follows:

[0032]

[0033] t n+1 ——The detection time of chloride ion concentration of desulfurization wastewater for the n+1th time, unit: xx hours and xx minutes;

[0034] t n——The nth detection time of chloride ion concentration in desulfurization wastewater, unit: xx hours and xx minutes;

[0035] r——radius of absorption tower, unit: m;

[0036] h n ——The operating liquid level of the absorption tower during the nth detection, unit: m;

[0037] c max ——Upper limit of control range of chloride ion concentration in desulfurization wastewater, unit: mg / L;

[0038] c min ——Lower limit of the control range of chloride ion concentration in desulfurization wastewater, unit: mg / L;

[0039] N n ——The flue gas volume at the inlet of the absorption tower at the nth detection, unit: m 3 / h;

[0040] p n ——HCl concentration of flue gas at the absorption tower inlet during the nth test, unit: mg / m 3 ;

[0041] V——average process water consumption per hour of the absorption tower, unit: m 3 / h;

[0042] c m ——Chloride ion concentration of process water, unit: mg / L.

[0043] In the above desulfurization wastewater Cl - In another specific embodiment of the online detection and intelligent emission control system, continue to refer to Figure 2 The desulfurization wastewater pre-precipitation device 101 may include an inlet control door connected to the desulfurization wastewater sampling port 1 and a desulfurization wastewater pre-precipitation tank 5 connected to the inlet control door. Preferably, the inlet control door may include an inlet manual door 2 connected to the desulfurization wastewater sampling port 1 and an inlet electric door 3 connected to the other end of the inlet manual door 2. If the electric door is damaged or fails, the personnel can rush to the site to close the manual door as soon as possible to protect the equipment, thereby improving safety. The desulfurization wastewater pre-precipitation tank 5 can be connected to the dilution device 11 through the outlet electric door 7. The bottom of the desulfurization wastewater pre-precipitation tank 5 also has a sewage discharge electric door 6, which can be connected to the ditch, and the upper part also has a liquid level meter 4. Specifically, the upper part of the desulfurization wastewater pre-precipitation tank 5 can be a cylinder, preferably with an inner diameter of 20 cm and a height of 120 cm, the lower part is a cone, the cone height is preferably 20 cm, and there is a round cover on the top. All materials are preferably tempered glass, and the wall thickness is preferably 5 mm. Of course, other sizes and materials can be selected according to actual needs, which are not limited here.

[0044] In the above desulfurization wastewater Cl - In another specific embodiment of the online detection and intelligent emission control system, the dilution device may include a dilution tank 11 connected to the outlet electric door 7, the upper part of the dilution tank 11 is provided with a dilution water electric door, the dilution water electric door 10 is connected to the dilution water manual door 8 through a flow meter 9, and the lower part of the dilution tank 11 is provided with a dilution tank sewage electric door 12, which may also be connected to the ditch. Specifically, the upper part of the dilution tank may be a cylinder, preferably with an inner diameter of 100 cm and a height of 25 cm, and the lower part may be a cone, preferably with a height of 20 cm. There is a cover on the top, and all materials may be tempered glass, and the wall thickness is preferably 5 mm.

[0045] It will be appreciated by those skilled in the art that the above-mentioned filtering device may preferably be a self-cleaning quartz sand filter, a mechanical filter or a membrane filter. Figure 2 The filter device in the embodiment is labeled 13.

[0046] Continue to refer Figure 2 In the above desulfurization wastewater Cl - In a preferred embodiment of the online detection and intelligent emission control system, the detection and calculation device may include a test water tank 14 connected to the filter device 13 and a water quality analyzer 16 connected to the water in the test water tank 14. The lower part of the test water tank 14 is provided with a test water tank sewage electric door 15. The water quality analyzer may be a multifunctional self-priming water quality analyzer, which functions to detect Cl in the desulfurization wastewater. - Concentration value, the bottom of the water quality analyzer is connected to the trench. Wherein, the test tank 14 can be a cylinder, preferably with an inner diameter of 5cm, a height of 10cm, a cover on the top, and all materials can be tempered glass, and the wall thickness is preferably 5mm.

[0047] In the above desulfurization wastewater Cl - In various embodiments of the online detection and intelligent emission control system, the desulfurization wastewater sampling port may include the overflow port of the gypsum cyclone, the overflow of the wastewater cyclone, the desulfurization tower sewage pipe or the desulfurization tower overflow pipe. In other words, the desulfurization wastewater sampling can be carried out from these places, which can be selected according to actual needs and are not limited here. Of course, other places can also be selected for sampling, which will not be repeated here.

[0048] A specific implementation step of the above system may be as follows:

[0049] (1) After the absorption tower slurry is discharged from the slurry discharge pump, it enters the desulfurization wastewater pre-precipitation tank 5 through the desulfurization wastewater sampling port 1, the inlet manual door 2 of the desulfurization wastewater pre-precipitation tank 5, and the inlet electric door 3 of the desulfurization wastewater pre-precipitation tank 5. The liquid level meter 4 detects a high-level signal to close the inlet electric door 3 of the desulfurization wastewater pre-precipitation tank 5. After standing for 20 minutes, the outlet electric door 7 of the desulfurization wastewater pre-precipitation tank 5 is opened. When the liquid level meter 4 detects that the liquid level of the desulfurization wastewater pre-precipitation tank 5 drops by 16 cm, the outlet electric door 7 of the desulfurization wastewater pre-precipitation tank 5 is closed, and the sewage discharge electric door 6 of the desulfurization wastewater pre-precipitation tank 5 is opened to complete the pre-precipitation step of the desulfurization wastewater;

[0050] (2) Open the dilution water electric door 10. When the flow meter 9 detects that the volume is 95L, close the dilution water electric door 10 and let it stand for 5 minutes to complete the dilution step of the desulfurization wastewater;

[0051] (3) After the standing is completed, the self-cleaning quartz sand filter 13 absorbs the water sample in the dilution tank 11, and discharges it into the test water tank 14 after filtering. After the self-cleaning quartz sand filter 13 works for 5 minutes, it is closed and starts self-cleaning, and the dilution tank sewage discharge electric door 12 is opened to complete the filtering step of the desulfurization wastewater;

[0052] (4) The water quality analyzer 16 absorbs the water sample from the test water tank 14, multiplies the test result by 20 times, converts it into an electrical signal and transmits it to the DCS system, which is the actual concentration of the desulfurization wastewater tested this time. Then, the test water tank sewage discharge electric door 15 is opened to complete the desulfurization wastewater testing step;

[0053] (5) If the nth test time is 14:00 on May 5, 2021, the liquid level of the absorption tower is 8m at the nth test, and the flue gas volume at the absorption tower inlet is 1200000m 3 / h (dry basis), the HCl concentration of the flue gas at the inlet of the absorption tower during the nth detection was 95 mg / m 3 The chloride ion concentration of the desulfurization wastewater detected for the nth time is 22000mg / L, the radius of the absorption tower is 6.5m, the upper limit of the control range of the chloride ion concentration of the desulfurization wastewater is 24000mg / L, the lower limit of the control range of the chloride ion concentration of the desulfurization wastewater is 20000mg / L, and the average process water consumption per hour of the absorption tower is 75m 3 / h, the chloride ion concentration of process water is 560mg / L, which is calculated by the intelligent emission control system of desulfurization wastewater and fed back to the operator. The recommended desulfurization wastewater discharge volume for the nth detection is 99m 3 The n+1th desulfurization wastewater testing time is 17:13 am on May 6, 2021;

[0054] (6) Wait for the next test time and repeat the above steps.

[0055] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one 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 present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A desulfurization wastewater Cl - Online detection and intelligent emission control system, characterized in that: The invention comprises a desulfurization wastewater pre-precipitation device connected to a desulfurization wastewater sampling port, and a dilution device, a filtering device and a detection and calculation device connected in sequence to the desulfurization wastewater pre-precipitation device, wherein the desulfurization wastewater pre-precipitation device is used to remove solids in the desulfurization wastewater, the dilution device is used to dilute the desulfurization wastewater, the filtering device is used to filter the desulfurization wastewater, and the detection and calculation device is used to detect Cl in the desulfurization wastewater. - The concentration is converted into an electrical signal and transmitted to a DCS system connected to the detection and calculation device, and is also used to calculate the Cl in the DCS system. - The concentration is used to calculate the current desulfurization wastewater discharge amount, and the amount is converted into an electrical signal and transmitted to the DCS system. The DCS system is used to perform intelligent discharge control of desulfurization wastewater according to the current desulfurization wastewater discharge amount; It also includes a flue gas analyzer installed at the inlet flue of the absorption tower, which is used to detect the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower and then convert it into an electrical signal of the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower and transmit the electrical signal of the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower to the DCS system connected to the flue gas analyzer, and the detection and calculation device is used to retrieve the electrical signal of the hydrogen chloride concentration of the flue gas at the inlet of the absorption tower from the DCS system and calculate the next detection time of the desulfurization wastewater in combination with the collected electrical signal of the chloride ion concentration of the desulfurization wastewater, the electrical signal of the flue gas volume at the inlet of the absorption tower and the electrical signal of the operating liquid level of the absorption tower, so as to perform intelligent emission control of the desulfurization wastewater; The calculation method of the next detection time of the desulfurization wastewater is as follows: t n+1 ——The detection time of chloride ion concentration of desulfurization wastewater for the n+1th time, unit: xx hours and xx minutes; t n ——The nth detection time of chloride ion concentration in desulfurization wastewater, unit: xx hours and xx minutes; r——radius of absorption tower, unit: m; h n ——The operating liquid level of the absorption tower during the nth detection, unit: m; c max ——Upper limit of control range of chloride ion concentration in desulfurization wastewater, unit: mg / L; c min ——Lower limit of the control range of chloride ion concentration in desulfurization wastewater, unit: mg / L; N n ——The flue gas volume at the inlet of the absorption tower at the nth detection, unit: m 3 / h; p n ——HCl concentration of flue gas at the absorption tower inlet during the nth test, unit: mg / m 3 ; V——average process water consumption per hour of the absorption tower, unit: m 3 / h; c m ——Chloride ion concentration of process water, unit: mg / L.

2. Desulfurization wastewater Cl according to claim 1 - Online detection and intelligent emission control system, characterized in that: The desulfurization wastewater pre-sedimentation device includes an inlet control gate connected to the desulfurization wastewater sampling port and a desulfurization wastewater pre-sedimentation tank connected to the inlet control gate. The desulfurization wastewater pre-sedimentation tank is connected to the dilution device through an outlet electric gate. The bottom of the desulfurization wastewater pre-sedimentation tank is also provided with a sewage discharge electric gate and a liquid level meter on the top.

3. Desulfurization wastewater Cl according to claim 2 - Online detection and intelligent emission control system, characterized in that: The dilution device comprises a dilution tank connected to the outlet electric door, the upper part of the dilution tank is provided with a dilution water electric door, the dilution water electric door is connected to the dilution water manual door through a flow meter, and the lower part of the dilution tank is provided with a dilution tank sewage electric door.

4. Desulfurization wastewater Cl according to claim 1 - Online detection and intelligent emission control system, characterized in that: The filtering device is a self-cleaning quartz sand filter, a mechanical filter or a membrane filter.

5. Desulfurization wastewater Cl according to claim 1 - Online detection and intelligent emission control system, characterized in that: The detection and calculation device comprises a test water tank connected to the filtering device and a water quality analyzer communicated with the water in the test water tank. The lower part of the test water tank is provided with a test water tank sewage electric door.

6. Desulfurization wastewater Cl according to claim 2 - Online detection and intelligent emission control system, characterized in that: The entrance control door includes an entrance manual door connected to the desulfurization wastewater sampling port and an entrance electric door connected to the other end of the entrance manual door.

7. Desulfurization wastewater Cl according to any one of claims 1 to 6 - Online detection and intelligent emission control system, characterized in that: The desulfurization wastewater sampling port includes a gypsum cyclone overflow port, a wastewater cyclone overflow, a desulfurization tower sewage pipe or a desulfurization tower overflow pipe.

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