Desulfurization slurry continuous detection system and method

Abstract

The invention relates to the technical field of slurry detection, in particular to a desulfurization slurry continuous detection system and method, the detection system comprises: a pretreatment device, which comprises two filtering units, each filtering unit comprises a slurry container connected with a sampling pipe of a desulfurization tower, and a liquid level meter and a filtering device are arranged in the slurry container, when the liquid level meter measures that the liquid level value of the slurry in the slurry container reaches the filtered slurry value, the slurry is filtered by the filtering device and then conveyed to the slurry detection device; the slurry detection device comprises a detection tank, and slurry detection equipment is arranged in the detection tank; and the flow measuring equipment is arranged on the liquid inlet pipeline of the detection tank and is used for detecting the flow of the slurry output by the filtering device of the current filtering unit, and when the flow of the slurry is smaller than a set flow value, the slurry is filtered by the filtering device of the other filtering unit and then is conveyed to the slurry detection device. By applying the detection system, continuous and accurate detection of the desulfurization slurry can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of slurry detection, and in particular to a desulfurization slurry continuous detection system and method. Background Art

[0002] The quality of the slurry in the absorption tower of the desulfurization system directly affects the desulfurization effect. The control of the change of chloride ion concentration in the desulfurization slurry is conducive to the stable operation of the desulfurization system; the concentration of sulfite ions in the desulfurization slurry reflects the oxidation of sulfur dioxide in the slurry, which can be used as a basis for regulating the oxidation air volume. The slurry in the power plant contains a large amount of solid impurities, and the specific slurry solid content is between 15% and 25%. If the slurry is directly extracted for chloride ion concentration and sulfite ion concentration detection, it is easily affected by solid impurities, resulting in the inability to accurately detect the chloride ion concentration and sulfite ion concentration in the slurry. In addition, the easy oxidation characteristics of sulfite also restrict the accuracy of the detection of sulfite ion concentration in the slurry.

[0003] Therefore, there is an urgent need for a desulfurization slurry continuous detection system and method to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that the chloride ion concentration and the sulfite ion concentration in the desulfurization slurry cannot be accurately detected continuously, and to provide a desulfurization slurry continuous detection system and method.

[0005] In order to achieve the above object, the first aspect of the present invention provides a desulfurization slurry continuous detection system, the desulfurization slurry continuous detection system comprising:

[0006] The pretreatment device comprises two filtering units, each of which comprises a slurry container connected to a sampling pipe of a desulfurization tower, wherein a slurry level meter and at least one filtering device are arranged inside the slurry container, and when the slurry level value in the slurry container measured by the slurry level meter reaches a filtering slurry value, the slurry is filtered by the filtering device and then transported to the slurry detection device;

[0007] The slurry detection device comprises a detection tank, wherein a slurry detection device is arranged in the detection tank for detecting the slurry entering the detection tank;

[0008] The flow measuring device is arranged on the liquid inlet pipeline of the detection tank, and is used to detect the slurry flow output by the filtering device of the current filtering unit, and when the slurry flow is less than the set flow value, it switches to the filtering device of another filtering unit to filter the slurry and then transport it to the slurry detection device.

[0009] Preferably, an overflow port and a drain port are respectively provided at the upper and lower parts of the slurry container, and both the overflow port and the drain port are connected to the pretreatment drain trough through pipelines, and an electric drain valve is provided on the connecting pipeline between the drain port and the pretreatment drain trough.

[0010] Preferably, it also includes a fuzzy PID controller for controlling the set opening time of the electric drain valve when the slurry level meter measures a slurry level value in the slurry container that is greater than a slurry overflow value, wherein the slurry overflow value is greater than the filtered slurry value.

[0011] Preferably, the control expression of the fuzzy PID controller is:

[0012]

[0013] Where u(t) is the time when the fuzzy PID controller controls the opening of the electric drain valve; K p , K i and K d are the proportional, integral and differential constants of the fuzzy PID controller respectively; e(t) is the difference between the slurry measurement value and the filtered slurry value at time t.

[0014] Preferably, the slurry inlet of the slurry container is located at the upper part thereof.

[0015] Preferably, a backwashing device is also included, which includes a water storage container, and the water storage container includes a water inlet and a backwashing water outlet respectively arranged at the upper and lower parts thereof, and a flushing liquid level meter is arranged inside the water storage container, and the backwashing water outlet is respectively connected to the water outlet pipes of the two filtering devices through pipelines, and a flushing pump is arranged on the pipeline, and the water inlet is connected to the discharge port of the detection tank through a pipeline.

[0016] Preferably, an overflow port is provided at the upper portion of the water storage container, and the overflow port is connected to the flushing drain tank through a pipeline.

[0017] Preferably, a stirrer is vertically arranged inside the slurry container, and the filtering device is arranged parallel to a stirring shaft of the stirrer.

[0018] Preferably, the slurry detection equipment includes a chloride ion concentration detector and a sulfite concentration detector.

[0019] The second aspect of the present invention provides a desulfurization slurry continuous detection method, which is applied to the above-mentioned desulfurization slurry continuous detection system. The desulfurization slurry continuous detection method comprises the following steps:

[0020] S1. The desulfurized slurry is respectively transported to the slurry containers of the two filtering units of the pretreatment device, and one filtering unit is selected. When the slurry level value measured by the slurry level meter in the slurry container reaches the filtered slurry value, the slurry is filtered by the filtering device and then transported to the slurry detection device;

[0021] S2. The slurry detection device in the detection tank performs real-time detection on the slurry entering the detection tank; wherein the flow measurement device detects the slurry flow output by the filtering device of the current filtering unit in real time, and when the slurry flow is less than the set flow value, switches to the filtering device of another filtering unit to filter the slurry and then delivers it to the slurry detection device.

[0022] According to the above technical scheme, based on the desulfurization slurry continuous detection system and method, by setting a pretreatment device including two filtering units, and setting a flow measurement device on the liquid inlet pipeline of the detection tank, in actual application, based on flow monitoring, when one of the filtering units is close to being blocked, it can be switched to another filtering unit in time to filter the slurry and then transport it to the slurry detection device, thereby ensuring continuous and accurate detection of the quality of the desulfurization slurry, and then realizing real-time monitoring of the performance of the desulfurization system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the desulfurization slurry continuous detection system;

[0024] Figure 2 It is a flow chart of the continuous detection method of desulfurization slurry.

[0025] Description of Reference Numerals

[0026] 1. Slurry container; 2. Filtration device; 3. Slurry level meter; 4. Mixer; 5. Electric slurry inlet valve; 6. Electric drain valve; 7. Pretreatment drainage trough; 8. Water production pump; 9. Electric water production valve; 10. Flow measurement equipment; 11. Detection tank; 12. Water storage container; 13. Flushing level meter; 14. Flushing drainage trough; 15. Flushing pump; 16. Electric flushing valve. DETAILED DESCRIPTION

[0027] The specific implementation of the embodiment of the present invention is described in detail below. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0028] The first aspect of the present invention provides a desulfurization slurry continuous detection system, such as Figure 1 As shown, the desulfurization slurry continuous detection system includes:

[0029] The pretreatment device comprises two filtering units, each of which comprises a slurry container 1 connected to a sampling pipe of a desulfurization tower, wherein a slurry level meter 3 and at least one filtering device 2 are arranged inside the slurry container 1, and when the slurry level meter 3 measures that the slurry level value in the slurry container 1 reaches the filtered slurry value, the slurry is filtered by the filtering device 2 and then transported to the slurry detection device;

[0030] The slurry detection device comprises a detection tank 11, wherein the detection tank 11 is provided with a slurry detection device for detecting the slurry entering the detection tank 11;

[0031] The flow measuring device 10 is arranged on the liquid inlet pipeline of the detection tank 11, and is used to detect the slurry flow output by the filtering device 2 of the current filtering unit, and when the slurry flow is less than the set flow value, it switches to the filtering device 2 of another filtering unit to filter the slurry and then transport it to the slurry detection device.

[0032] In a specific embodiment, the slurry detection device includes a chloride ion concentration detector and a sulfite concentration detector. The flow measurement device 10 is a flow meter. In another specific embodiment, the filtered slurry value needs to be higher than Figure 1 The top of the upper filter area of ​​the filter device 2 is shown to prevent the water production pump 8 from sucking air and burning the pump, and causing inaccurate flow meter measurements and misjudging the filter element as being clogged.

[0033] According to the above technical scheme, based on the desulfurization slurry continuous detection system, by setting a pretreatment device including two filtering units, and setting a flow measurement device on the liquid inlet pipeline of the detection tank, in actual application, based on flow monitoring, when one of the filtering units is close to being blocked, it can be switched to another filtering unit in time to filter the slurry and then transport it to the slurry detection device, thereby ensuring continuous and accurate detection of the quality of the desulfurization slurry, and then realizing real-time monitoring of the performance of the desulfurization system.

[0034] In the desulfurization slurry continuous detection system of the present invention, preferably, a stirrer 4 is arranged inside the slurry container 1 in the vertical direction, and the filtering device 2 is arranged parallel to the stirring shaft of the stirrer 4. By arranging the stirrer 4 inside the slurry container 1 for continuous stirring, the rapid sedimentation of solids in the slurry can be effectively avoided, thereby avoiding the rapid sedimentation of solids in the slurry causing the internal volume of the slurry container 1 to be reduced, and then causing the lower part of one or more filtering devices 2 arranged parallel to the stirring shaft of the stirrer 4 to be blocked, and the slurry cannot be filtered.

[0035] In the desulfurization slurry continuous detection system of the present invention, preferably, the upper and lower parts of the slurry container 1 are respectively provided with an overflow port and a sewage outlet, the overflow port and the sewage outlet are connected to the pretreatment drainage trough 7 through pipelines, and an electric sewage valve 6 is provided on the connecting pipeline between the sewage outlet and the pretreatment drainage trough 7. By further providing an overflow port at the upper part of the slurry container 1, it can be ensured that the slurry value in the slurry container 1 is maintained above the filtered slurry value without affecting the filtered water production, and at the same time, the excess slurry can be overflowed to the pretreatment drainage trough 7 in time, and the slurry in the slurry container 1 will not overflow to the working area after being filled, resulting in the need to interrupt the desulfurization slurry continuous detection system, and it will be put into use again after manual treatment.

[0036] However, it is found in actual application that the slurry flow rates are different at different slurry collection positions in the power plant, or even at the same slurry collection position. Therefore, in actual application, although an overflow port has been set, when the slurry flow rate suddenly increases, the slurry overflow may not be timely, resulting in the slurry filling the slurry container 1. Therefore, in the present invention, a sewage outlet is further set at the lower part of the slurry container 1, so that when the overflow port is too late to overflow, the sewage outlet can be opened in time to discharge the slurry, thereby further effectively preventing the slurry from filling the slurry container 1 and overflowing, and at the same time, a small amount of solid impurities settled at the bottom can be discharged.

[0037] However, it was further discovered in actual application that, although timely opening of the drain outlet can prevent the slurry from filling the slurry container 1, due to the volatility of the slurry flow rate, it is impossible to accurately confirm the opening time of the drain outlet. If the drain outlet is opened for too long, the slurry level value in the slurry container 1 will be lower than the filtered slurry value, causing the water production pump 8 to exhaust air and burn the pump, while if the opening time is too short, the slurry cannot be discharged in time. Therefore, the preferred present invention further designs a fuzzy PID controller for controlling the opening set time of the electric drain valve 6 when the slurry level meter 3 measures the slurry level value in the slurry container 1 to be greater than the slurry overflow value, wherein the slurry overflow value is greater than the filtered slurry value. The specific opening time is controlled according to the difference between the slurry measurement value and the filtered slurry value at the current moment. Therefore, in a specific embodiment, the control expression of the fuzzy PID controller is:

[0038]

[0039] Where u(t) is the time when the fuzzy PID controller controls the opening of the electric drain valve; K p , K i and K dare the proportional, integral and differential constants of the fuzzy PID controller respectively; and e(t) is the difference between the slurry measurement value and the filtered slurry value at time t. That is, based on the joint action of the fuzzy PID controller, the slurry level meter 3 and the electric drain valve 6, when the slurry level value in the slurry container 1 is greater than the slurry overflow value, the electric drain valve 6 can be opened in time to discharge the slurry without causing excessive slurry discharge.

[0040] In another preferred embodiment, the slurry inlet of the slurry container 1 is located at the upper part thereof, thereby further reducing the settling rate of solid impurities in the slurry based on the cooperation with the agitator 4.

[0041] In the desulfurization slurry continuous detection system described in the present invention, preferably, it also includes a backwashing device, which includes a water storage container 12, and the water storage container 12 includes a water inlet and a backwashing water outlet respectively arranged at the upper and lower parts thereof, and a flushing liquid level meter 13 is arranged therein, and the backwashing water outlet is respectively connected to the outlet pipes of the two filtering devices 2 through pipelines, and a flushing pump 15 is arranged on the pipeline, and the water inlet is connected to the discharge port of the detection tank 11 through a pipeline. In actual application, the filtered slurry from the detection tank 11 is first stored in the water storage container 12. When the flow measurement device 10 detects that the slurry flow output by the filter device 2 of the current filter unit is less than the set flow value, the electric slurry inlet valve 5, water production pump 8 and electric water production valve 9 of the current filter unit are closed, the electric sewage valve 6 and the electric flushing valve 16 are opened, and the flushing pump 15 is started to flush the filter device 2 of the current filter unit for a preset time. After the preset time is reached, the electric flushing valve 16, the flushing pump 15 and the electric sewage valve 6 are closed, and the electric slurry inlet valve 5 is opened to restore the filtering performance of the filter device 2 and wait for the next switching. Repeat the above operation to realize the alternating flushing of the two filter devices 2, thereby realizing continuous detection of the desulfurization slurry without interruption of detection due to clogging of the filter element due to long-term filtration. The time from when the filter device 2 is put into use to when it needs to be flushed is usually long. Therefore, when the filter device 2 needs to be flushed, the slurry value in the water storage container 12 is usually higher than the set flushing liquid level value. Therefore, under normal circumstances, the flushing liquid level meter 13 will not send a signal of insufficient slurry, resulting in failure to start flushing. Of course, an external water source can also be directly introduced to ensure that the amount of water in the water storage container 12 always meets the flushing water volume. The main reason for not directly introducing it here is to further save costs and realize the reuse of the filtered slurry.

[0042] In another preferred embodiment, an overflow port is provided at the upper portion of the water storage container 12, and the overflow port is connected to the flushing drain trough 14 through a pipeline. By providing the overflow port, the filtered slurry in the water storage container 12 can meet the flushing volume requirement while not overflowing to the outside due to being full. In another preferred embodiment, a drain port is provided at the lower portion of the water storage container 12, and the drain port is connected to the flushing drain trough 14 through a pipeline, and a mechanical ball valve is provided on the pipeline, which is used to open the mechanical ball valve to empty the liquid in the water storage container 12 when the system needs to be shut down for a long time. In another preferred embodiment, an emptying port is provided at the bottom of the detection tank 11, which is used to open the emptying port to empty the liquid in the detection tank 11 when the system needs to be shut down for a long time.

[0043] In the desulfurization slurry continuous detection system of the present invention, preferably, Figure 1 As shown, the electric slurry inlet valve 5, the electric sewage valve 6, the electric water production valve 9 and the electric flushing valve 16 are all equipped with mechanical ball valves so that they can be manually controlled when the electric control fails. In a further preferred embodiment, the electric water production valve 9 and the electric flushing valve 16 are also equipped with check valves to prevent slurry from flowing back.

[0044] The second aspect of the present invention provides a method for continuous detection of desulfurized slurry, which is applied to the above-mentioned continuous detection system of desulfurized slurry, such as Figure 2 As shown, the desulfurization slurry continuous detection method comprises the following steps:

[0045] S1, the desulfurized slurry is respectively transported to the slurry containers 1 of the two filtering units of the pretreatment device, one filtering unit is selected, and when the slurry level value measured by the slurry level meter 3 in the slurry container 1 reaches the filtered slurry value, the slurry is filtered by the filtering device 2 and then transported to the slurry detection device;

[0046] S2. The slurry detection device in the detection tank 11 performs real-time detection on the slurry entering the detection tank 11; wherein the flow measurement device 10 detects the slurry flow output by the filter device 2 of the current filter unit in real time, and when the slurry flow is less than the set flow value, switches to the filter device 2 of another filter unit to filter the slurry and then transports it to the slurry detection device.

[0047] According to the above technical scheme, based on the continuous detection method of desulfurization slurry, by setting a pretreatment device including two filtering units, and setting a flow measurement device on the liquid inlet pipeline of the detection tank, in actual application, based on flow monitoring, when one of the filtering units is close to being blocked, it can be switched to another filtering unit in time to filter the slurry and then transport it to the slurry detection device, thereby ensuring continuous and accurate detection of the quality of the desulfurization slurry, and then realizing real-time monitoring of the performance of the desulfurization system.

[0048] The present invention will be described in detail below through examples, but the protection scope of the present invention is not limited thereto.

[0049] Example 1

[0050] Use Figure 1 The desulfurization slurry continuous detection system shown is implemented, specifically, the desulfurization slurry continuous detection system includes:

[0051] The pretreatment device comprises two filtering units, each of which comprises a slurry container 1 connected to a sampling pipe of a desulfurization tower, wherein a slurry level meter 3 and at least one filtering device 2 are arranged inside the slurry container 1, and when the slurry level meter 3 measures that the slurry level value in the slurry container 1 reaches the filtered slurry value, the slurry is filtered by the filtering device 2 and then transported to the slurry detection device;

[0052] The slurry detection device comprises a detection tank 11, wherein the detection tank 11 is provided with a slurry detection device for detecting the slurry entering the detection tank 11;

[0053] The flow measurement device 10 is arranged on the liquid inlet pipeline of the detection tank 11, and is used to detect the slurry flow output by the filtering device 2 of the current filtering unit, and when the slurry flow is less than the set flow value, it switches to the filtering device 2 of another filtering unit to filter the slurry and then transport it to the slurry detection device;

[0054] A stirrer 4 is vertically arranged inside the slurry container 1, and the filtering device 2 is arranged parallel to the stirring axis of the stirrer 4; the slurry detection equipment includes a chloride ion concentration detector and a sulfite concentration detector; the slurry inlet of the slurry container 1 is located at the upper part thereof.

[0055] In actual application, S1, start the mixer 4, and open the electric slurry inlet valve 5, and transport the desulfurized slurry to the slurry containers 1 of the two filter units of the pretreatment device respectively, and select Figure 1 The filtering unit in the middle and upper part, when the slurry level meter 3 in its slurry container 1 measures that the slurry level value reaches the filtered slurry value, opens the electric water production valve 9, and starts the water production pump 8 to filter the slurry through the filtering device 2 and then transport it to the detection tank 11 of the slurry detection device; S2, the chloride ion concentration detector and the sulfite concentration detector in the detection tank 11 perform real-time detection of the chloride ion concentration and the sulfite concentration of the slurry entering the detection tank 11; wherein, the flow measurement device 10 detects the slurry flow output by the filtering device 2 of the current filtering unit in real time, and when its slurry flow is less than the set flow value, switches to the filtering device 2 of the lower filtering unit to filter the slurry and then transport it to the slurry detection device.

[0056] After testing, it was found that the desulfurization slurry continuous detection system described in the present invention can achieve continuous and accurate detection of desulfurization slurry, compared with the direct sampling detection scheme in the prior art, while avoiding the influence of the slurry solid medium on the detection accuracy, and reducing the influence of sulfite oxidation on the detection accuracy when the slurry is extracted for testing.

[0057] Example 2

[0058] The embodiment is implemented with reference to Example 1, but different therefrom, it further includes a backwashing device, the backwashing device includes a water storage container 12, the water storage container 12 includes a water inlet and a backwashing water outlet respectively arranged at the upper and lower parts thereof, and a flushing liquid level meter 13 is arranged inside the water storage container, the backwashing water outlet is connected to the outlet pipes of the two filtering devices 2 respectively through pipelines, and a flushing pump 15 is arranged on the pipeline, the water inlet is connected to the discharge port of the detection tank 11 through a pipeline; an overflow port is arranged at the upper part of the water storage container 12, and the overflow port is connected to the flushing drain trough 14 through a pipeline.

[0059] After testing, it is found that the desulfurization slurry continuous detection system described in the present invention, compared with the scheme in Example 1, can further switch to the filtering device of the lower filtering unit to filter the slurry and then transport it to the slurry detection device, close the electric slurry inlet valve, water production pump and electric water production valve of the upper filtering unit, open the electric sewage valve and electric flushing valve, and start the flushing pump to flush the filtering device of the upper filtering unit for a preset time, thereby ensuring that the system can continuously detect the desulfurization slurry for a long time.

[0060] Example 3

[0061] Refer to Example 2 for implementation. The difference is that the upper and lower parts of the slurry container 1 are respectively provided with an overflow port and a drain port, the overflow port and the drain port are connected to the pretreatment drain tank 7 through pipelines, and an electric drain valve 6 is provided on the connecting pipeline between the drain port and the pretreatment drain tank 7; and a fuzzy PID controller is also included, which is used to control the electric drain valve 6 to open and set the time when the slurry level value measured by the slurry level meter 3 in the slurry container 1 is greater than the slurry overflow value, wherein the slurry overflow value is greater than the filtered slurry value; the control expression of the fuzzy PID controller is:

[0062]

[0063] Where u(t) is the time when the fuzzy PID controller controls the opening of the electric drain valve; K p , K i and K dare the proportional, integral and differential constants of the fuzzy PID controller respectively; e(t) is the difference between the slurry measurement value and the filtered slurry value at time t.

[0064] After testing, it is found that the desulfurization slurry continuous detection system described in the present invention, compared with the scheme in Example 2, can further realize the interlocking of the filtered slurry value in the slurry container based on the joint action of the fuzzy PID controller, the slurry level meter and the electric drain valve, thereby effectively preventing the slurry in the slurry container from overflowing when the desulfurization inlet slurry fluctuates greatly.

[0065] The desulfurization slurry continuous detection system and method provided by the present invention, by setting up a pretreatment device including two filtering units, and setting a flow measurement device on the liquid inlet pipeline of the detection tank. In actual application, based on flow monitoring, when one of the filtering units is close to being blocked, it can be switched to another filtering unit in time to filter the slurry and then transport it to the slurry detection device, thereby ensuring continuous and accurate detection of the quality of the desulfurization slurry, and then realizing real-time monitoring of the performance of the desulfurization system.

[0066] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A desulfurization slurry continuous detection system, characterized in that: The desulfurization slurry continuous detection system includes: A pretreatment device, comprising two filtering units, each of which comprises a slurry container (1) connected to a desulfurization tower sampling pipe, wherein a slurry level meter (3) and at least one filtering device (2) are arranged inside the slurry container (1), and when the slurry level value in the slurry container (1) measured by the slurry level meter (3) reaches a filtered slurry value, the slurry is filtered by the filtering device (2) and then transported to a slurry detection device; A slurry detection device comprises a detection tank (11), wherein a slurry detection device is arranged in the detection tank (11) and is used to detect the slurry entering the detection tank (11); The flow measurement device (10) is arranged on the liquid inlet pipeline of the detection tank (11) and is used to detect the slurry flow output by the filtering device (2) of the current filtering unit, and when the slurry flow is less than the set flow value, switch to filtering the slurry through the filtering device (2) of another filtering unit and then transport it to the slurry detection device.

2. The desulfurization slurry continuous detection system according to claim 1 is characterized in that: The upper and lower parts of the slurry container (1) are respectively provided with an overflow port and a sewage outlet, and the overflow port and the sewage outlet are both connected to the pretreatment drainage trough (7) through pipelines, and an electric sewage valve (6) is provided on the connecting pipeline between the sewage outlet and the pretreatment drainage trough (7).

3. The desulfurization slurry continuous detection system according to claim 2 is characterized in that: It also includes a fuzzy PID controller for controlling the electric drain valve (6) to open for a set time when the slurry level meter (3) measures that the slurry level value in the slurry container (1) is greater than the slurry overflow value, wherein the slurry overflow value is greater than the filtered slurry value.

4. The desulfurization slurry continuous detection system according to claim 3 is characterized in that: The control expression of the fuzzy PID controller is: Where u(t) is the time when the fuzzy PID controller controls the opening of the electric drain valve; K p , K i and K d are the proportional, integral and differential constants of the fuzzy PID controller respectively; e(t) is the difference between the slurry measurement value and the filtered slurry value at time t.

5. The desulfurization slurry continuous detection system according to claim 1 is characterized in that: The slurry inlet of the slurry container (1) is located at the upper part thereof.

6. The desulfurization slurry continuous detection system according to any one of claims 1 to 5, characterized in that: It also includes a backwashing device, which includes a water storage container (12), the water storage container (12) includes a water inlet and a backwashing water outlet respectively arranged at the upper and lower parts thereof, and a flushing liquid level meter (13) is arranged inside the water storage container, the backwashing water outlet is connected to the water outlet pipelines of the two filtering devices (2) through pipelines, and a flushing pump (15) is arranged on the pipeline, and the water inlet is connected to the liquid discharge port of the detection tank (11) through a pipeline.

7. The desulfurization slurry continuous detection system according to claim 6 is characterized in that: The upper part of the water storage container (12) is provided with an overflow port, and the overflow port is connected to the flushing drainage trough (14) through a pipeline.

8. The desulfurization slurry continuous detection system according to claim 1 is characterized in that: A stirrer (4) is arranged vertically inside the slurry container (1), and the filtering device (2) is arranged parallel to the stirring axis of the stirrer (4).

9. The desulfurization slurry continuous detection system according to claim 1, characterized in that: The slurry detection equipment includes a chloride ion concentration detector and a sulfite concentration detector.

10. A method for continuous detection of desulfurization slurry, characterized in that: The desulfurization slurry continuous detection system applied to any one of claims 1 to 9 above, the desulfurization slurry continuous detection method comprises the following steps: S1, the desulfurized slurry is respectively transported to the slurry containers (1) of the two filtering units of the pretreatment device, one filtering unit is selected, and when the slurry level value measured by the slurry level meter (3) in the slurry container (1) reaches the filtered slurry value, the slurry is filtered by the filtering device (2) and then transported to the slurry detection device; S2, the slurry detection device in the detection tank (11) performs real-time detection on the slurry entering the detection tank (11); wherein the flow measurement device (10) detects in real time the flow rate of the slurry output by the filtering device (2) of the current filtering unit, and when the slurry flow rate is less than a set flow rate value, switches to filtering the slurry through the filtering device (2) of another filtering unit and then conveys it to the slurry detection device.

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