FGD demister flushing method and system based on differential pressure detection

Abstract

The invention relates to the technical field of demister flushing, and discloses an FGD demister flushing method and system based on differential pressure detection, and the method comprises the steps: obtaining equipment state data, judging whether a demister flushing condition is satisfied, and if the flushing condition is not satisfied, carrying out state early warning; if the flushing condition is met, detecting and scanning the differential pressure value of each layer of demister, and establishing an abnormal layer and a detection queue; detecting the detection queue in sequence, if an abnormal value exists, establishing an abnormal queue, and washing each layer of demister in the abnormal queue; and if the abnormal value does not exist in the detection queue, flushing the abnormal layer. According to the method, the problems of energy consumption, time consumption, labor consumption and the like of a traditional method are effectively solved, automatic fixed-point flushing is adopted, related fault protection is set, data collected by each detection instrument can be compared with a set value for judgment, an early warning signal is sent out if the data exceed a calibrated range, and a guarantee is provided for stable operation of the demister.

Description

Technical Field

[0001] The present invention relates to the technical field of demister flushing, and in particular to a FGD demister flushing method and system based on differential pressure detection. Background Art

[0002] The mist eliminator in the absorption tower is one of the important equipment of FGD. It is mainly used to remove the droplets carried by the flue gas in the absorption tower, so as to reduce the corrosion and pollution of the droplets to the subsequent equipment. The traditional mist eliminator flushing is performed manually and regularly according to the pressure difference change of the mist eliminator. This has the problems of uneven flushing, low flushing efficiency, high flushing energy consumption, and waste of water resources. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above existing problems, the present invention is proposed. Therefore, the present invention provides a FGD demister flushing method based on differential pressure detection to solve the problems of uneven flushing, low flushing efficiency, high flushing energy consumption and waste of water resources.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a FGD defogger flushing method based on differential pressure detection, comprising: acquiring equipment status data, determining whether a defogger flushing condition is met, and if the flushing condition is not met, issuing a status warning;

[0007] If the flushing conditions are met, the differential pressure values ​​of the defoggers at each layer are tested and scanned, and an abnormal layer and a detection queue are established;

[0008] The detection queue is detected in sequence, and if there is an abnormal value, an abnormal queue is established, and each layer of demisters in the abnormal queue is flushed;

[0009] If there is no abnormal value in the detection queue, the abnormal layer is flushed. After the flushing is completed, the differential pressure detection of each layer is repeated again to carry out the next round of flushing.

[0010] As a preferred solution of the FGD demister flushing method based on differential pressure detection described in the present invention, wherein: obtaining equipment status data and determining whether the demister flushing conditions are met includes:

[0011] Obtain the absorber liquid level value and the demister water flushing equipment status and operation data;

[0012] Flushing condition one, judging whether the liquid level value of the absorption tower is lower than a preset liquid level value, if it is lower than the preset liquid level value, the flushing condition one is met;

[0013] Flushing condition 2: detecting the operating data of the demister water washing equipment status. If the demister is in a fault-free state, each valve is in an initial closed state, and the data status of each detection instrument is in a normal range, then flushing condition 2 is met;

[0014] If the flushing condition one and the flushing condition two are satisfied at the same time, the defogger flushing condition is satisfied.

[0015] As a preferred solution of the FGD demister flushing method based on differential pressure detection described in the present invention, if the flushing conditions are not met, the status warning includes:

[0016] If flushing condition 1 is not met, the system will enter the protection stop mode and stop flushing.

[0017] If the second flushing condition is not met, the defogger is checked for faults. If a fault exists, the defogger enters a fault alarm state and defogger flushing is prohibited. If no fault exists, it is re-determined whether the defogger flushing meets the conditions.

[0018] As a preferred solution of the FGD demister flushing method based on differential pressure detection according to the present invention, the establishment of abnormal layers and detection queues includes:

[0019] At the same time, the differential pressure value of each layer of demister is detected, and the abnormal layer x and the detection queue Q1 are established;

[0020] When the differential value of layer x is abnormal, an abnormal layer x is established, and the abnormal differential pressure value of layer x includes:

[0021] Abnormal condition one: the actual differential pressure value is less than the differential pressure set value or the actual differential pressure value is greater than the differential pressure set value; abnormal condition two: abnormal condition one is met and the detection duration is greater than or equal to the preset abnormal time.

[0022] As a preferred solution of the FGD demister flushing method based on differential pressure detection described in the present invention, the establishment of the detection queue Q1 includes:

[0023] A queue is established from the previous layer of the abnormal layer x to the first layer to generate the detection queue Q1.

[0024] As a preferred solution of the FGD demister flushing method based on differential pressure detection according to the present invention, the establishment of an abnormal queue includes:

[0025] The detection queue Q1 is detected in descending order. If there is an abnormal value in the Q1 detection queue, an abnormal queue Q2 is established, and the abnormal layer number is added to the abnormal queue Q2 (1, 2..., m);

[0026] Among them, the first abnormal layer in the abnormal queue Q2 corresponds to the abnormal layer with the smallest layer value, and the mth abnormal layer corresponds to the abnormal layer with the largest layer value;

[0027] The abnormal queue Q2 is flushed in the order of queue sorting from front to back.

[0028] As a preferred solution of the FGD demister flushing method based on differential pressure detection according to the present invention, the flushing of the abnormal layer includes:

[0029] Get the defogger status of the current layer;

[0030] Establish a flushing queue Q3 for the defogger, and add the defoggers in normal condition to the flushing queue Q3 according to the position order;

[0031] Check the flushing queue Q3. If the flushing queue Q3 is completely empty, a fault alarm of the current layer is triggered, and flushing of the current layer is terminated.

[0032] If the queue of the flushing queue Q3 is not empty, and the number of defoggers in the flushing queue Q3 is equal to the number of defoggers in the current layer, the defoggers in the current layer are flushed one by one according to the queue order in the flushing queue Q3;

[0033] If the number of defoggers in the flushing queue Q3 is not equal to the number of defoggers in this layer, an alarm is issued for the defoggers not in the flushing queue Q3, and then the defoggers in the flushing queue Q3 are flushed according to the queue order.

[0034] In a second aspect, the present invention provides a FGD demister flushing system based on differential pressure detection, comprising:

[0035] The judgment module is used to obtain the equipment status data and judge whether the defogger flushing conditions are met. If the flushing conditions are not met, a status warning is issued;

[0036] The detection module is used to detect and scan the differential pressure values ​​of the defoggers at each layer if the flushing conditions are met, and to establish an abnormal layer and a detection queue;

[0037] A first flushing module is used to detect the detection queue in sequence, establish an abnormal queue if there is an abnormal value, and flush each layer of defogger in the abnormal queue;

[0038] The second flushing module is used to flush the abnormal layer if there is no abnormal value in the detection queue. After the flushing is completed, the differential pressure detection of each layer is repeated again to carry out the next round of flushing.

[0039] In a third aspect, the present invention provides an electronic device, comprising:

[0040] Memory and processor;

[0041] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the FGD demister flushing method based on differential pressure detection are implemented.

[0042] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the FGD demister flushing method based on differential pressure detection.

[0043] Compared with the prior art, the present invention has the following beneficial effects: the present invention effectively solves the problems of energy consumption, time consumption, and manpower consumption of traditional methods by introducing differential pressure detection and automatic control algorithms. The present invention adopts automatic fixed-point flushing and also sets relevant fault protection. It can compare and judge the data collected by each detection instrument with the set value. If it exceeds the calibrated range, an early warning signal is issued to provide guarantee for the stable operation of the defogger. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0045] Figure 1 It is a schematic diagram of the overall process of a FGD demister flushing method based on differential pressure detection according to an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a specific algorithm flow of a FGD demister flushing method based on differential pressure detection according to an embodiment of the present invention;

[0047] Figure 3 A schematic flow chart of the start-up and operation flushing conditions of a FGD demister flushing method based on differential pressure detection according to an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of a flushing process of each layer of a demister of a FGD demister flushing method based on differential pressure detection according to an embodiment of the present invention;

[0049] Figure 5 This is a schematic diagram of process water pressure and flow rate control based on PID algorithm for an FGD demister flushing method based on differential pressure detection described in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0051] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0053] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0054] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Reference Figure 1-Figure 5 , is an embodiment of the present invention, and provides a FGD demister flushing method based on differential pressure detection, such as Figure 1 As shown, including:

[0057] S101, obtaining equipment status data to determine whether the defogger flushing conditions are met, and if the flushing conditions are not met, issuing a status warning;

[0058] S102, if the flushing conditions are met, the differential pressure values ​​of the defoggers at each layer are detected and scanned, and an abnormal layer and a detection queue are established;

[0059] S103, inspect the inspection queue in order, if there is an abnormal value, establish an abnormal queue, and flush the defoggers of each layer in the abnormal queue;

[0060] S104, if there is no abnormal value in the detection queue, the abnormal layer is flushed, and after the flushing is completed, the differential pressure detection of each layer is repeated again to carry out the next round of flushing.

[0061] It should be noted that the demister differential pressure value helps to detect the operating status of the demister and the blockage of the demister. The demister differential pressure value is an important indicator of the operating status of the demister. By detecting the flue gas pressure values ​​entering and leaving the demister, the flue gas differential pressure value of the demister can be calculated. During the use of the demister, as the particulate matter in the flue gas accumulates, the differential pressure value will gradually increase. When the demister differential pressure value exceeds the design value, the following hazards may occur: 1) Affecting the defogger effect: Excessive differential pressure indicates that the demister may have problems such as blockage or scaling, which will reduce the flue gas flow area of ​​the demister and increase the flue gas flow rate. On the one hand, high-velocity flue gas may bring a large amount of slurry into subsequent equipment, such as causing the GGH (gas-to-gas heat exchanger) heat exchange element to be blocked, affecting the flue gas heat exchange, causing the net flue gas temperature to drop, and accelerating the corrosion rate of the flue and equipment at the tail of the absorption tower; on the other hand, the demisting effect becomes worse, the amount of water droplets carried in the net flue gas increases, and the horizontal flue drainage pipe at the chimney entrance has a large drainage volume, which will cause corrosion to the net flue and other equipment. At the same time, the smoke carries gypsum particles and produces gypsum rain. 2) Increase system resistance: Excessive differential pressure of the demister means that the resistance of the entire FGD system increases, which will cause the induced draft fan to overcome greater resistance to promote the flow of flue gas, thereby increasing the power consumption of the induced draft fan and increasing the operating cost. 3) Threaten equipment safety: When the differential pressure of the demister is too large and lasts for a long time, the surface of the demister element may be covered with gypsum and other substances, which may easily cause the demister element to be overstressed, or even collapse and damage, which may affect the normal operation of the entire desulfurization system. 4) Impact on measurement accuracy: Excessive differential pressure may cause blockage of the demister differential pressure sampling pipeline, resulting in measurement errors, affecting the operator's accurate judgment of the actual operating status of the demister, and is not conducive to taking effective countermeasures in a timely manner.

[0062] Based on the differential pressure detection of each layer of demister, flushing according to different differential pressures can reduce the energy consumption of flushing and improve the flushing efficiency. The flushing pressure and flushing time can be adjusted according to the actual situation of the differential pressure of each layer of demister on site to achieve intelligent combined flushing, which reduces energy consumption and is conducive to the maintenance of FGD water balance. At the same time, the flushing method of the present invention, with the help of a flushing water pump controlled by a variable frequency drive, can adjust the working frequency of the flushing pump according to the change of the differential pressure of the demister, ensure the flushing pressure and water volume, and improve the flushing efficiency, that is, it can reduce the flushing damage to the demister caused by excessive water pressure, and can also avoid poor flushing effect due to insufficient water pressure. According to the real-time change of differential pressure during the flushing process, the flushing effect can be evaluated in real time.

[0063] Preferably, in step S101, obtaining device status data and determining whether the defogger flushing condition is met includes:

[0064] Obtain the absorber liquid level value and the demister water flushing equipment status and operation data;

[0065] Flushing condition 1, judging whether the liquid level value of the absorption tower is lower than the preset liquid level value, if it is lower than the preset liquid level value, the flushing condition 1 is met;

[0066] Flushing condition 2: Check the status and operation data of the defogger water washing equipment. If the defogger is in a fault-free state, all valves are in the initial closed state, and the data status of all detection instruments is within the normal range, then flushing condition 2 is met, where the data of each detection instrument includes but is not limited to water pressure, differential pressure, flow rate, and current;

[0067] If flushing condition one and flushing condition two are met at the same time, the defogger flushing condition is met.

[0068] Preferably, if the flushing condition is not met, the status warning includes:

[0069] If flushing condition 1 is not met, the system will enter the protection stop mode and stop flushing.

[0070] If the second flushing condition is not met, the defogger is checked for faults. If a fault exists, the defogger enters a fault alarm state and defogger flushing is prohibited. If no fault exists, it is re-determined whether the defogger flushing meets the conditions.

[0071] Specifically, if all the above conditions are met, the startup preparation stage is entered, otherwise the defogger is checked for faults. If flushing condition one is not met, the equipment enters the protection stop mode and stops the subsequent flushing work to avoid the water balance of the absorption tower being destroyed; if flushing condition two is not met, the equipment will not enter the flushing state, and an early warning will be issued in the DCS control system to remind the monitoring personnel to handle the abnormality. If there is no fault, recheck whether the defogger flushing meets the conditions.

[0072] Therefore, flushing satisfies the conditions such as Figure 2 As shown, the flushing operation will be locked if and only if a. the actual value of the absorption tower is lower than the set value; b. the detection instrument is normal; c. the flushing water pump operates normally.

[0073] Preferably, in step S102, establishing an abnormal layer and a detection queue includes:

[0074] At the same time, the differential pressure value of each layer of demister is detected, and the abnormal layer x and the detection queue Q1 are established;

[0075] When the differential value of layer x is abnormal, an abnormal layer x is established. The abnormal differential pressure value of layer x includes:

[0076] Abnormal condition one: the actual differential pressure value is less than the differential pressure set value or the actual differential pressure value is greater than the differential pressure set value; abnormal condition two: abnormal condition one is met and the detection duration is greater than or equal to the preset abnormal time.

[0077] Specifically, the differential pressure value of each layer of demister is detected and scanned. Since each layer of demister is equipped with a differential pressure detection device, the differential pressure value of each layer is detected simultaneously and in real time.

[0078] Preferably, establishing the detection queue Q1 includes:

[0079] While establishing the abnormal layer x, a queue is established from the previous layer of the abnormal layer x to the first layer to generate a detection queue Q1.

[0080] Preferably, in step S103, establishing an exception queue includes:

[0081] The detection queue Q1 is detected in descending order. If there is an abnormal value in the Q1 detection queue, an abnormal queue Q2 is established, and the abnormal layer number is added to the abnormal queue Q2 (1, 2..., m);

[0082] Among them, the first abnormal layer in the abnormal queue Q2 corresponds to the abnormal layer with the smallest layer value, and the mth abnormal layer corresponds to the abnormal layer with the largest layer number.

[0083] The abnormal queue Q2 is flushed in the order of the queue from front to back, that is, flushed in the order of abnormal layer 1, abnormal layer 2...abnormal layer m.

[0084] Preferably, Figure 3 As shown, flushing the abnormal layer x includes:

[0085] Get the defogger status of the current layer;

[0086] Establish a flushing queue Q3 for the defogger, and add the defoggers in normal condition to the flushing queue Q3 according to the position order;

[0087] Check flushing queue Q3. If the flushing queue Q3 is completely empty, the fault alarm of the current layer is triggered and the flushing of the current layer ends.

[0088] If the queue of flushing queue Q3 is not empty, and the number of defoggers in flushing queue Q3 is equal to the number of defoggers in the current layer, the defoggers in the current layer are flushed one by one according to the queue order in flushing queue Q3;

[0089] If the number of defoggers in the flushing queue Q3 is not equal to the number of defoggers in this layer, an alarm will be issued for the defoggers that are not in the flushing queue Q3, and then the defoggers in the flushing queue Q3 will be flushed according to the queue order.

[0090] It should be noted that the process water pressure and flow rate control based on the PID algorithm is as follows Figure 4 As shown, negative feedback of flow rate and differential pressure is established based on PID algorithm to achieve regulation of the motor water pump.

[0091] The traditional flushing method adopts manual method, and flushes layer by layer at fixed time and fixed point based on experience. The present embodiment effectively solves the problems of energy consumption, time consumption and manpower consumption of the traditional method by introducing a differential pressure detection device and an automatic control algorithm. The FGD defogger flushing method based on FGD differential pressure detection adopts automatic fixed-point flushing and also sets relevant fault protection. It can compare and judge the data collected by each detection instrument with the set value. If it exceeds the calibrated range, an early warning signal will be issued to provide guarantee for the stable operation of the defogger.

[0092] According to the characteristics that the wet desulfurization absorption tower is generally equipped with multi-layer demisters, in addition to the total differential pressure (the total pressure drop of the flue gas after desulfurization passing through all layers of demisters), the present invention also sets a differential pressure detection function for each layer of demisters, avoiding the traditional practice of operators manually flushing each layer of demisters once in turn to reduce the total differential pressure after the total differential pressure of the demister increases. According to the detection return value of the differential pressure of each layer of demisters, the demisters with high blocked differential pressure can be flushed first, thus achieving targeted flushing, ensuring flushing efficiency, and reducing flushing energy consumption. Avoid the traditional flushing method, where a large amount of flushing water enters the absorption tower and destroys the water balance.

[0093] The present invention uses a variable frequency driven defogger flushing water pump, a flushing main pipe water pressure detection transmitter and a flow meter, and establishes a flushing model through the desulfurization DCS, so as to realize flushing methods with different pressures according to different blockage conditions (different differential pressure values) in the operation of each layer of defogger. For the windward side of the first layer of defogger that first contacts the flue gas, during flushing, the flushing pressure is increased by increasing the operating frequency of the water pump, and the flushing pressure of each layer of defogger is reduced in turn according to the direction of flue gas flow, and the optimal flushing pressure is obtained according to the flushing effect. This approach not only avoids the damage to the defogger caused by excessive flushing water pressure, but also solves the problems of poor flushing effect, excessive flushing time and excessive water volume caused by too low flushing water pressure.

[0094] The flushing method based on the differential pressure detection of each layer of demister implemented by the present invention can also realize the automatic optimization function during flushing through real-time detection of differential pressure. For demisters with excessively fast blocked differential pressure or excessively large differential pressure, the flushing frequency and flushing pressure can be increased; for demister layers under differential pressure, the flushing frequency and flushing pressure can be reduced.

[0095] The above is a schematic scheme of a FGD defogger flushing method based on differential pressure detection in this embodiment. It should be noted that the technical scheme of the FGD defogger flushing system based on differential pressure detection and the technical scheme of the FGD defogger flushing method based on differential pressure detection belong to the same concept. The details of the technical scheme of the FGD defogger flushing system based on differential pressure detection in this embodiment that are not described in detail can all be referred to the description of the technical scheme of the FGD defogger flushing method based on differential pressure detection.

[0096] The FGD demister flushing system based on differential pressure detection in this embodiment includes:

[0097] The judgment module is used to obtain the equipment status data and judge whether the defogger flushing conditions are met. If the flushing conditions are not met, a status warning is issued;

[0098] The detection module is used to detect and scan the differential pressure values ​​of the defoggers at each layer if the flushing conditions are met, and to establish an abnormal layer and a detection queue;

[0099] The first flushing module is used to detect the detection queue in sequence, establish an abnormal queue if there is an abnormal value, and flush the defoggers of each layer in the abnormal queue;

[0100] The second flushing module is used to flush the abnormal layer if there is no abnormal value in the detection queue. After the flushing is completed, the differential pressure detection of each layer is repeated again to carry out the next round of flushing.

[0101] This embodiment also provides an electronic device, which is applicable to the case of flushing the FGD demister based on differential pressure detection, including:

[0102] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the FGD demister flushing method based on differential pressure detection as proposed in the above embodiment.

[0103] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the FGD demister flushing method based on differential pressure detection as proposed in the above embodiment is implemented.

[0104] The storage medium proposed in this embodiment and the FGD demister flushing method based on differential pressure detection proposed in the above embodiment belong to the same inventive concept. The technical details not described in detail in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0105] Through the above description of the implementation mode, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation mode. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0106] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A FGD demister flushing method based on differential pressure detection, characterized in that: include: Obtain equipment status data to determine whether the defogger flushing conditions are met. If the flushing conditions are not met, issue a status warning; If the flushing conditions are met, the differential pressure values ​​of the defoggers at each layer are tested and scanned, and an abnormal layer and a detection queue are established; The detection queue is detected in sequence, and if there is an abnormal value, an abnormal queue is established, and each layer of demisters in the abnormal queue is flushed; If there is no abnormal value in the detection queue, the abnormal layer is flushed. After the flushing is completed, the differential pressure detection of each layer is repeated again to carry out the next round of flushing.

2. The FGD demister flushing method based on differential pressure detection according to claim 1, characterized in that: Obtaining equipment status data to determine whether the defogger flushing conditions are met includes: Obtain the absorber liquid level value and the demister water flushing equipment status and operation data; Flushing condition one, judging whether the liquid level value of the absorption tower is lower than a preset liquid level value, if it is lower than the preset liquid level value, the flushing condition one is met; Flushing condition 2: detecting the operating data of the demister water washing equipment status. If the demister is in a fault-free state, each valve is in an initial closed state, and the data status of each detection instrument is in a normal range, then flushing condition 2 is met; If the flushing condition one and the flushing condition two are satisfied at the same time, the defogger flushing condition is satisfied.

3. The FGD demister flushing method based on differential pressure detection according to claim 2, characterized in that: If the flushing conditions are not met, the status warning includes: If flushing condition 1 is not met, the system enters the protection stop mode and stops flushing. If the second flushing condition is not met, the defogger is checked for faults. If a fault exists, the defogger enters a fault alarm state and defogger flushing is prohibited. If no fault exists, it is re-determined whether the defogger flushing meets the conditions.

4. The FGD demister flushing method based on differential pressure detection according to claim 1 or 3, characterized in that: The establishment of the abnormal layer and the detection queue includes: At the same time, the differential pressure value of each layer of demister is detected, and the abnormal layer x and the detection queue Q1 are established; When the differential value of layer x is abnormal, an abnormal layer x is established, and the abnormal differential pressure value of layer x includes: Abnormal condition one: the actual differential pressure value is less than the differential pressure set value or the actual differential pressure value is greater than the differential pressure set value; abnormal condition two: abnormal condition one is met and the detection duration is greater than or equal to the preset abnormal time.

5. The FGD demister flushing method based on differential pressure detection according to claim 4, characterized in that: Establishing the detection queue Q1 includes: A queue is established from the previous layer of the abnormal layer x to the first layer to generate the detection queue Q1.

6. The FGD demister flushing method based on differential pressure detection according to claim 5, characterized in that: The establishment of an exception queue comprises: The detection queue Q1 is detected in descending order. If there is an abnormal value in the Q1 detection queue, an abnormal queue Q2 is established, and the abnormal layer number is added to the abnormal queue Q2 (1, 2..., m); Among them, the first abnormal layer in the abnormal queue Q2 corresponds to the abnormal layer with the smallest layer value, and the mth abnormal layer corresponds to the abnormal layer with the largest layer value; The abnormal queue Q2 is flushed in the order of queue sorting from front to back.

7. The FGD demister flushing method based on differential pressure detection according to claim 4, characterized in that: The flushing of the abnormal layer comprises: Get the defogger status of the current layer; Establish a flushing queue Q3 for the defogger, and add the defoggers in normal condition to the flushing queue Q3 according to the position order; Check the flushing queue Q3. If the flushing queue Q3 is completely empty, a fault alarm of the current layer is triggered, and flushing of the current layer is terminated. If the queue of the flushing queue Q3 is not empty, and the number of defoggers in the flushing queue Q3 is equal to the number of defoggers in the current layer, the defoggers in the current layer are flushed one by one according to the queue order in the flushing queue Q3; If the number of defoggers in the flushing queue Q3 is not equal to the number of defoggers in the layer, an alarm is issued for the defoggers not in the flushing queue Q3, and then the defoggers in the flushing queue Q3 are flushed according to the queue order.

8. A FGD demister flushing system based on differential pressure detection, characterized in that: include, The judgment module is used to obtain the equipment status data and judge whether the defogger flushing conditions are met. If the flushing conditions are not met, a status warning is issued; The detection module is used to detect and scan the differential pressure values ​​of the defoggers at each layer if the flushing conditions are met, and to establish an abnormal layer and a detection queue; A first flushing module is used to detect the detection queue in sequence, establish an abnormal queue if there is an abnormal value, and flush each layer of defogger in the abnormal queue; The second flushing module is used to flush the abnormal layer if there is no abnormal value in the detection queue. After the flushing is completed, the differential pressure detection of each layer is repeated again to carry out the next round of flushing.

9. An electronic device, characterized in that: include: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the FGD demister flushing method based on differential pressure detection as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: It stores computer executable instructions, which, when executed by a processor, implement the steps of the FGD demister flushing method based on differential pressure detection as described in any one of claims 1 to 7.

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