Ash silo positive pressure ash emission early warning method and system

Abstract

The invention discloses an ash silo positive pressure ash emission early warning method and system, and relates to the technical field of power plant safety, and the method comprises the following steps: accessing an ash silo internal pressure detection signal to a DCS, and carrying out the real-time early warning according to the internal pressure condition of an ash silo; setting a reasonable pressure threshold according to different ash storage capacities, and generating a control signal by adopting a fuzzy control algorithm; the invention discloses a positive-pressure ash emission early warning method for an ash silo by adopting a control signal. According to the invention, a sensor is connected to a DCS, an early warning platform is developed in the DCS, and logic is compiled to control the output of a bag-type dust collector at the top of the ash silo; the number of ash conveying pipelines of different ash conveying units of the two furnaces in the same time period is adjusted, and the pressure in the ash silo is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of power plant safety, and in particular to an ash silo positive pressure ash leakage early warning method and system. Background Art

[0002] In the pneumatic ash silo system of power plants, positive pressure ash leakage is a common but serious problem. Positive pressure ash leakage not only causes environmental pollution, but also threatens the safety of equipment and personnel. Therefore, it is of great practical significance to develop an effective ash silo positive pressure ash leakage warning device and control method. The device and method can effectively solve the problem of positive pressure ash leakage in the ash silo and improve the safe operation level of the power plant. Summary of the invention

[0003] In view of the problems existing in the existing ash leakage warning and system of the positive pressure ash silo, the present invention is proposed.

[0004] Therefore, the problem to be solved by the present invention is that it is impossible to monitor the pressure changes in the ash bin in real time, resulting in the inability to issue early warning in time.

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

[0006] In a first aspect, an embodiment of the present invention provides an ash storage positive pressure ash leakage early warning method, which comprises the following steps:

[0007] The internal pressure detection signal of the ash silo is connected to the DCS, and real-time warning is issued according to the pressure situation in the ash silo;

[0008] According to different ash storage capacities, reasonable pressure thresholds are set and fuzzy control algorithms are used to generate control signals;

[0009] The control signal is used to complete the positive pressure ash leakage early warning method of the ash bin.

[0010] As a preferred solution of the positive pressure ash leakage warning method of the ash silo of the present invention, the control signal generation method includes:

[0011] The ash storage can be divided into N bins according to the capacity of the bag filter chamber, and X pressure points are designed on the bag filter chamber of each bin;

[0012] The collected pressure signal is sent to the logic controller, and the controller determines in real time that the pressure exceeds the preset value and issues an audible and visual alarm;

[0013] The logic controller sends out a control signal at the same time to adjust the operating frequency of the ash bin blower. When the pressure increases, the operating frequency of the blower increases. When the pressure is reduced to the set value, the frequency of the blower drops to 50Hz.

[0014] The frequency of the ash bin fan increases and the air flow rate in the ash bin increases to prevent the pressure value in the ash bin from rising. When the pressure exceeds the allowable value, the air is discharged in time.

[0015] As a preferred solution of the positive pressure ash leakage warning method of the ash silo of the present invention, the detection pressure signal in the ash silo includes an upper pressure limit value and a lower pressure limit value;

[0016] The upper limit of the detection pressure of the dust bag box is P1, the upper limit of the detection pressure of the dust bag hopper is P2, the lower limit of the monitoring pressure of the dust bag is P3, and the lower limit of the detection pressure of the dust bag hopper is P4;

[0017] The allowable values ​​of ash storage pressure difference are 0.1MPa and 0.2MPa respectively.

[0018] As a preferred solution of the ash silo positive pressure early warning method of the present invention, the ash silo positive pressure early warning method further comprises the following steps:

[0019] First, the pressure sensor is arranged at the four pressure measuring holes of A, B, C and D of each bag dust hopper to detect the pressure difference of each bag dust hopper. At the same time, the pressure of the ash box pressure point is connected to the DCS respectively and monitored by the DCS system. Second, the four pressure differences of each bag dust hopper are controlled according to the pressure difference value to ensure that the pressure in each hopper is within a safe range;

[0020] The electrostatic precipitator control on the ash hopper includes the following steps:

[0021] When the pressure difference in hopper a exceeds P1, a fault signal is sent to the DCS, and the blower frequency is automatically adjusted to 60Hz;

[0022] When the pressure difference drops below P1, a signal is sent to the blower again to restore to 50Hz;

[0023] When the pressure difference of ash hopper a exceeds P1 for a period of time, ash hopper a is forced to stop, and a stop signal is sent to the electrostatic precipitator of electric field A at the same time, and an alarm is sent to DCS;

[0024] aAfter the ash hopper electrostatic precipitator stops operating, the pressure signal is connected to the DCS as a detection signal.

[0025] As a preferred solution of the positive pressure ash leakage warning method of the ash bin of the present invention, the detection pressure signal includes the ash position of the ash hopper, each ash hopper is provided with a first ash position and a second ash position matching the corresponding ash hopper, the first ash position is higher than the second ash position, and there is a height difference h between the first ash position and the second ash position;

[0026] The height difference h between the first gray level and the second gray level is 5 cm;

[0027] The first ash position is connected to the ash conveying pipeline to input the ash in the ash hopper to the next process. A first pressure sensor is provided in the first ash position, and a second pressure sensor is provided in the second ash position. When the ash level in the first ash position exceeds the height where the first pressure sensor is located, and the ash level in the second ash position exceeds the height where the second pressure sensor is located, the first pressure sensor generates a pressure signal, and the second pressure sensor generates a pressure signal. The ash level signals of the first ash position and the second ash position are both input into the DCS; after the ash level signals are input into the DCS, the DCS sends out an audible and visual alarm, and notifies the on-site operating personnel to close the ash conveying channel valve, and reduce the ash level in the ash hopper back to a safe range;

[0028] The ash level is the relative height of the ash in the ash hopper, which is the distance between the accumulation of ash in the ash hopper and the ash hopper mouth.

[0029] As a preferred solution of the positive pressure ash leakage early warning method of the ash silo of the present invention, the positive pressure ash leakage early warning method of the ash silo further comprises the following steps:

[0030] Ash silo pressure detection, the pressure inside the ash silo is divided into the following three situations:

[0031] When the pressure difference of the ash hopper exceeds 0.1Mpa or the pressure difference of the bag dust collector exceeds 0.2Mpa, the control function of the logic controller is used to increase the frequency of the ash silo blower to 50Hz;

[0032] When the hopper pressure difference exceeds 0.2Mpa, the frequency will be increased to 60Hz;

[0033] When the hopper pressure difference exceeds 0.2Mpa for 5 minutes, the DCS will send out an alarm signal;

[0034] When the ash hopper pressure difference exceeds 0.2Mpa continuously for 15min, the DCS sends an alarm signal and the fan frequency is increased to 60Hz.

[0035] As a preferred solution of the positive pressure ash leakage early warning method of the ash silo of the present invention, it also includes the following steps:

[0036] Processing method of monitoring pressure signal of dust collector front ash box:

[0037] Each bin is equipped with two bag dust collectors, and the ash box pressure signal uses the average pressure of the two bag dust collectors in each bin as the set value for pressure monitoring;

[0038] A first ash box and a second ash box are arranged in each ash box, and there is a pressure difference between the first ash box and the second ash box;

[0039] The pressures of the four pressure points of the first gray box are used as the set pressure upper limit value, and the pressure difference between the first gray box and the second gray box is used as the detection pressure signal;

[0040] The pressure value of the second ash box is used as the set lower limit of pressure; 4 pressure points are set for the 2 bag dust collectors in each warehouse, and the pressure points on each ash box are set to 2 pressure points.

[0041] In a second aspect, an embodiment of the present invention provides an ash silo positive pressure ash leakage warning system, which includes a detection module, a calculation module, and an early warning module;

[0042] The detection module is used to detect the pressure inside the ash bin, can monitor the pressure changes inside the ash bin in real time, and connect the signal to the DCS system for subsequent processing and early warning;

[0043] The calculation module is used to set a reasonable pressure threshold according to different ash storage capacities and generate a control signal;

[0044] The early warning module uses a control signal to complete the early warning of positive pressure ash leakage in the ash bin.

[0045] In a third aspect, an embodiment of the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, any step of the above-mentioned ash bin positive pressure ash emission warning method is implemented.

[0046] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned ash bin positive pressure ash emission warning method is implemented.

[0047] The beneficial effects of the present invention are as follows: by connecting the sensor to the DCS, an early warning platform is developed in the DCS, and logic is compiled to control the output of the bag filter on the top of the ash bin; the number of ash conveying pipes of different ash conveying units of two furnaces in the same period is adjusted to reduce the pressure in the ash bin. The application results show that the device and method can effectively warn of the occurrence of positive pressure ash leakage in the ash bin, improve the safe operation level of the power plant, and reduce the risk of environmental pollution and equipment damage. The original annual average number of positive pressure ash leakage in the ash bin was about 18 times, which was reduced to 6 times after improvement; the power consumption cost of the dust removal fan in the ash bin was reduced by 20,000 yuan / year; the maintenance cost of the bag filter device in the ash bin was reduced by 64,000 yuan / year. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0049] Figure 1This is a flow chart of the ash storage positive pressure ash leakage warning method. 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] Example 1

[0057] Reference Figure 1 , which is the first embodiment of the present invention, provides an ash silo positive pressure ash leakage early warning method, comprising the following steps:

[0058] S1. The internal pressure detection signal of the ash bin is connected to the DCS, and a real-time warning is issued according to the pressure situation in the ash bin.

[0059] The ash silo is divided into n chambers, each chamber contains m ash hoppers, and each ash hopper is equipped with n pressure points. The pressure signals on each chamber and ash hopper are sent to the DCS system respectively, and controlled according to different situations to ensure safe operation.

[0060] The detection pressure signal in the ash bin includes an upper pressure limit and a lower pressure limit;

[0061] The upper limit of the detection pressure of the dust bag box is P1, the upper limit of the detection pressure of the dust bag hopper is P2, the lower limit of the monitoring pressure of the dust bag is P3, and the lower limit of the detection pressure of the dust bag hopper is P4;

[0062] The allowable values ​​of ash storage pressure difference are 0.1MPa and 0.2MPa respectively.

[0063] Taking P3 as the initial reference value, according to different time periods, the pressure value is divided into x segments with a gradient of 0.05Mpa, and each segment is controlled separately; according to the x segments, fuzzy controller control is adopted; among them, the larger the fuzzy control amount, the greater the operating frequency of the ash bin blower, ensuring that the pressure in the ash bin is always within the allowable range.

[0064] The detection pressure signal includes the ash position of the ash hopper, each ash hopper is provided with a first ash position and a second ash position matching the corresponding ash hopper, the first ash position is higher than the second ash position, and there is a height difference h between the first ash position and the second ash position;

[0065] The height difference h between the first gray level and the second gray level is 5 cm;

[0066] The first ash position is connected to the ash conveying pipeline to input the ash in the ash hopper to the next process. A first pressure sensor is provided in the first ash position, and a second pressure sensor is provided in the second ash position. When the ash level in the first ash position exceeds the height where the first pressure sensor is located, and the ash level in the second ash position exceeds the height where the second pressure sensor is located, the first pressure sensor generates a pressure signal, and the second pressure sensor generates a pressure signal. The ash level signals of the first ash position and the second ash position are both input into the DCS; after the ash level signals are input into the DCS, the DCS sends out an audible and visual alarm, and notifies the on-site operating personnel to close the ash conveying channel valve, and reduce the ash level in the ash hopper back to a safe range;

[0067] The ash level is the relative height of the ash in the ash hopper, which is the distance between the accumulation of ash in the ash hopper and the ash hopper mouth.

[0068] In this embodiment, when the pressure in the ash bin exceeds the set threshold, the controller will issue a warning signal. When the pressure is set to <-0.15Mpa, the dust removal fan runs at 20Hz, and when it is -0.15Mpa-0.2Mpa, the dust removal fan runs at 35Hz. When it is >0.2Mpa, a first-level alarm signal is issued, and the operator strengthens observation. At the same time, the frequency of the dust removal fan is increased to 50Hz. If the pressure difference is >0.2Mpa for more than 30 minutes, a second-level alarm signal is issued to remind the operator to adjust the ash delivery strategy and appropriately reduce the ash delivery amount.

[0069] The internal pressure detection signal of the ash silo is connected to the DCS, and different control logics can be taken in time according to the early warning signal to adjust the output of the pneumatic ash conveying equipment to prevent the amount of air entering the ash silo by the pneumatic ash conveying from exceeding the amount of air extracted by the bag dust collector, causing the pressure in the ash silo to exceed 0.2Mpa, resulting in positive pressure ash bubbling.

[0070] When the pressure is set to <-0.15Mpa, the dust removal fan runs at 20Hz, and when it is -0.15Mpa-0.2Mpa, the dust removal fan runs at 35Hz. When it is >0.2Mpa, a first-level alarm signal is issued, and the operating personnel strengthen observation. At the same time, the frequency of the dust removal fan is increased to 50Hz. If the pressure difference is >0.2Mpa and lasts for more than 30 minutes, a second-level alarm signal is issued to remind the operating personnel to adjust the ash conveying strategy, and a "reduce ash conveying gas volume" warning signal pop-up window is issued on the DCS operation screen; if the pressure difference is >0.2Mpa and lasts for more than 60 minutes, a third-level alarm value signal is issued, and a "bag filter bag pressure difference of bag filter is too large" warning signal pop-up window is issued on the DCS operation screen.

[0071] On both sides of the dust filter bags on the top of the ash silo, pressure pipes are laid in different areas to measure the pressure and send it to the differential pressure transmitter for pressure monitoring. If the pressure difference is large, vibration is applied to avoid insufficient output due to bag blockage.

[0072] The pressure difference on both sides of the bag filter is measured by a pressure sensor. When the pressure difference is <-0.15Mpa, the bag filter vibration device vibrates once every half an hour; within the range of -0.15Mpa-0.2Mpa, it vibrates once every 15 minutes, and >0.2Mpa, it vibrates once every 10 minutes; when the pressure difference increases, that is, -0.15Mpa->0.2Mpa, it vibrates once every time it enters a metering interval; when the pressure difference decreases, that is, 0.2Mpa->-0.15Mpa, only the vibration timing is updated.

[0073] S2. According to the different ash storage capacities, set a reasonable pressure threshold and use fuzzy control algorithm to generate control signals.

[0074] The control signal generation method includes:

[0075] The ash storage can be divided into N bins according to the capacity of the bag filter chamber, and X pressure points are designed on the bag filter chamber of each bin;

[0076] The collected pressure signal is sent to the logic controller, and the controller determines in real time that the pressure exceeds the preset value and issues an audible and visual alarm;

[0077] The logic controller sends out a control signal at the same time to adjust the operating frequency of the ash bin blower. When the pressure increases, the operating frequency of the blower increases. When the pressure is reduced to the set value, the frequency of the blower drops to 50Hz.

[0078] The frequency of the ash bin fan increases and the air flow rate in the ash bin increases to prevent the pressure value in the ash bin from rising. When the pressure exceeds the allowable value, the air is discharged in time.

[0079] In this embodiment, a reasonable threshold is set, and the appropriate pressure threshold is determined according to the actual situation and safety requirements of the ash storage. According to the historical operation data (time, pressure difference, dust removal fan operation frequency), the AdaBoost algorithm is used to cluster the data. According to the clustering results, and in order to reduce costs and simplify the classification, it can be divided into three types: <-0.15Mpa, -0.15Mpa-0.2Mpa, and >0.2Mpa.

[0080] Real-time monitoring and data analysis: through real-time monitoring and analysis of pressure data, abnormal pressure changes can be discovered in time. Appropriate control measures can be taken, such as adjusting the ash discharge rate (establishing a locking relationship based on DCS, adjusting the number of ash conveying pipelines in the same period), adding ventilation equipment, or using frequency conversion to control the output of dust removal fans, etc. according to early warning signals.

[0081] Adjust the ash delivery rate:

[0082] If the pressure difference of the ash storage is less than 0.2Mpa, the ash transport strategy will not be adjusted;

[0083] If the pressure difference is >0.2Mpa, adjust the ash conveying strategy according to the ash level of the electrostatic precipitator hopper; if the ash level of the electrostatic precipitator hopper in one electric field is higher than 1.5m, stop conveying ash in the third and fourth electric fields and reduce the ash conveying amount; if the ash level in one electric field is >0.9, <1.5, change the number of ash conveying pipelines in one electric field from 2 to 1, and stop using one ash conveying pipeline; if the ash level in one electric field is <0.9m, stop both ash conveying pipelines (two ash conveying pipelines in one electric field);

[0084] If the ash level of the second electric field is higher than 1.7m, according to the ash level of the first electric field, the ash level of the third and fourth electric fields, stop using one ash conveying pipeline of the first electric field, or the ash conveying pipeline of the third and fourth electric fields (the third and fourth electric fields share one ash conveying pipeline);

[0085] If the ash level of the third and fourth power plants is higher than 1.8m, one ash conveying pipeline of the first electric field or the ash conveying pipeline of the second electric field (one ash conveying pipeline of the second electric field) will be shut down according to the ash level of the first electric field and the ash level of the second electric field.

[0086] S3. Use control signals to complete the positive pressure ash leakage warning method of the ash bin.

[0087] The positive pressure ash leakage early warning method of the ash silo also includes the following steps:

[0088] Ash silo pressure detection, the pressure inside the ash silo is divided into the following three situations:

[0089] When the pressure difference of the ash hopper exceeds 0.1Mpa or the pressure difference of the bag dust collector exceeds 0.2Mpa, the control function of the logic controller is used to increase the frequency of the ash silo blower to 50Hz;

[0090] When the hopper pressure difference exceeds 0.2Mpa, the frequency will be increased to 60Hz;

[0091] When the hopper pressure difference exceeds 0.2Mpa for 5 minutes, the DCS will send out an alarm signal;

[0092] When the ash hopper pressure difference exceeds 0.2Mpa continuously for 15min, the DCS sends an alarm signal and the fan frequency is increased to 60Hz.

[0093] The following steps are also included:

[0094] Processing method of monitoring pressure signal of dust collector front ash box:

[0095] Each bin is equipped with two bag dust collectors, and the ash box pressure signal uses the average pressure of the two bag dust collectors in each bin as the set value for pressure monitoring;

[0096] A first ash box and a second ash box are arranged in each ash box, and there is a pressure difference between the first ash box and the second ash box;

[0097] The pressures of the four pressure points of the first gray box are used as the set pressure upper limit value, and the pressure difference between the first gray box and the second gray box is used as the detection pressure signal;

[0098] The pressure value of the second ash box is used as the set lower limit of pressure; 4 pressure points are set for the 2 bag dust collectors in each warehouse, and the pressure points on each ash box are set to 2 pressure points.

[0099] The ash silo positive pressure early warning method also includes the following steps:

[0100] First, the pressure sensor is arranged at the four pressure measuring holes of A, B, C and D of each bag dust hopper to detect the pressure difference of each bag dust hopper. At the same time, the pressure of the ash box pressure point is connected to the DCS respectively and monitored by the DCS system. Second, the four pressure differences of each bag dust hopper are controlled according to the pressure difference value to ensure that the pressure in each hopper is within a safe range;

[0101] The electrostatic precipitator control on the ash hopper includes the following steps:

[0102] When the pressure difference in hopper a exceeds P1, a fault signal is sent to the DCS, and the blower frequency is automatically adjusted to 60Hz;

[0103] When the pressure difference drops below P1, a signal is sent to the blower again to restore to 50Hz;

[0104] When the pressure difference of ash hopper a exceeds P1 for a period of time, such as 20 minutes, a red warning will pop up on the DCS screen, and after the ash hopper a is forced to stop operating, a stop signal will be sent to the electrostatic precipitator of the A electric field at the same time, and an alarm will be sent to the DCS;

[0105] aAfter the ash hopper electrostatic precipitator stops operating, the pressure signal is connected to the DCS as a detection signal.

[0106] In summary, by connecting sensors to DCS, developing an early warning platform in DCS, and compiling logic to control the output of the bag filter on the top of the ash bin, the number of ash pipes of different ash conveying units of the two furnaces in the same period of time was adjusted to reduce the pressure in the ash bin. The application results show that the device and method can effectively warn of the occurrence of positive pressure ash leakage in the ash bin, improve the safe operation level of the power plant, and reduce the risk of environmental pollution and equipment damage. The average number of positive pressure ash leakage in the ash bin was about 18 times per year, which was reduced to 6 times after improvement; the power consumption of the dust removal fan in the ash bin was reduced by 20,000 yuan / year; the maintenance cost of the bag filter device in the ash bin was reduced by 64,000 yuan / year.

[0107] Example 2

[0108] On the basis of the first embodiment, this embodiment further provides an ash silo positive pressure ash leakage warning system, including a detection module, a calculation module, and an early warning module;

[0109] The detection module is used to detect the pressure inside the ash bin, can monitor the pressure changes inside the ash bin in real time, and connect the signal to the DCS system for subsequent processing and early warning;

[0110] The calculation module is used to set a reasonable pressure threshold according to different ash storage capacities and generate a control signal;

[0111] The early warning module uses a control signal to complete the early warning of positive pressure ash leakage in the ash bin.

[0112] This embodiment also provides a computer device, which is suitable for the ash bin positive pressure dust emission warning method, including a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the ash bin positive pressure dust emission warning method proposed in the above embodiment.

[0113] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0114] This embodiment further provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for realizing positive pressure ash leakage warning of an ash bin as proposed in the above embodiment is implemented.

[0115] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0116] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. 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 positive pressure ash leakage early warning method for an ash silo, characterized by: The following steps are included: The internal pressure detection signal of the ash silo is connected to the DCS, and real-time warning is issued according to the pressure situation in the ash silo; According to different ash storage capacities, reasonable pressure thresholds are set and fuzzy control algorithms are used to generate control signals; The control signal is used to complete the positive pressure ash leakage early warning method of the ash bin.

2. The ash storage positive pressure ash leakage early warning method according to claim 1, characterized in that: The control signal generation method includes: The ash storage can be divided into N bins according to the capacity of the bag filter chamber, and X pressure points are designed on the bag filter chamber of each bin; The collected pressure signal is sent to the logic controller, and the controller determines in real time that the pressure exceeds the preset value and issues an audible and visual alarm; The logic controller sends out a control signal at the same time to adjust the operating frequency of the ash bin blower. When the pressure increases, the operating frequency of the blower increases. When the pressure is reduced to the set value, the frequency of the blower drops to 50Hz. The frequency of the ash bin fan increases and the air flow rate in the ash bin increases to prevent the pressure value in the ash bin from rising. When the pressure exceeds the allowable value, the air is discharged in time.

3. The ash storage positive pressure ash leakage early warning method according to claim 2, characterized in that: The detection pressure signal in the ash bin includes an upper pressure limit and a lower pressure limit; The upper limit of the detection pressure of the dust bag box is P1, the upper limit of the detection pressure of the dust bag hopper is P2, the lower limit of the monitoring pressure of the dust bag is P3, and the lower limit of the detection pressure of the dust bag hopper is P4; The allowable values ​​of ash storage pressure difference are 0.1MPa and 0.2MPa respectively.

4. The ash storage positive pressure ash leakage early warning method according to claim 3, characterized in that: The ash silo positive pressure early warning method also The following steps are included: First, the pressure sensor is arranged at the four pressure measuring holes of A, B, C and D of each bag dust hopper to detect the pressure difference of each bag dust hopper. At the same time, the pressure of the ash box pressure point is connected to the DCS respectively and monitored by the DCS system. Second, the four pressure differences of each bag dust hopper are controlled according to the pressure difference value to ensure that the pressure in each hopper is within a safe range; The electrostatic precipitator control on the ash hopper includes the following steps: When the pressure difference in hopper a exceeds P1, a fault signal is sent to the DCS, and the blower frequency is automatically adjusted to 60Hz; When the pressure difference drops below P1, a signal is sent to the blower again to restore to 50Hz; When the pressure difference of ash hopper a exceeds P1 for a period of time, ash hopper a is forced to stop, and a stop signal is sent to the electrostatic precipitator of electric field A at the same time, and an alarm is sent to DCS; aAfter the ash hopper electrostatic precipitator stops operating, the pressure signal is connected to the DCS as a detection signal.

5. The ash storage positive pressure ash leakage early warning method according to claim 4, characterized in that: The detection pressure signal includes the ash position of the ash hopper, each ash hopper is provided with a first ash position and a second ash position matching the corresponding ash hopper, the first ash position is higher than the second ash position, and there is a height difference h between the first ash position and the second ash position; The height difference h between the first gray level and the second gray level is 5 cm; The first ash position is connected to the ash conveying pipeline to input the ash in the ash hopper to the next process. A first pressure sensor is provided in the first ash position, and a second pressure sensor is provided in the second ash position. When the ash level in the first ash position exceeds the height where the first pressure sensor is located, and the ash level in the second ash position exceeds the height where the second pressure sensor is located, the first pressure sensor generates a pressure signal, and the second pressure sensor generates a pressure signal. The ash level signals of the first ash position and the second ash position are both input into the DCS; after the ash level signals are input into the DCS, the DCS sends out an audible and visual alarm, and notifies the on-site operating personnel to close the ash conveying channel valve, and reduce the ash level in the ash hopper back to a safe range; The ash level is the relative height of the ash in the ash hopper, which is the distance between the accumulation of ash in the ash hopper and the ash hopper mouth.

6. The ash storage positive pressure ash leakage early warning method according to claim 5, characterized in that: The positive pressure ash leakage early warning method of the ash silo also The following steps are included: Ash silo pressure detection, the pressure inside the ash silo is divided into the following three situations: When the pressure difference of the ash hopper exceeds 0.1Mpa or the pressure difference of the bag dust collector exceeds 0.2Mpa, the control function of the logic controller is used to increase the frequency of the ash silo blower to 50Hz; When the hopper pressure difference exceeds 0.2Mpa, the frequency will be increased to 60Hz; When the hopper pressure difference exceeds 0.2Mpa for 5 minutes, the DCS will send out an alarm signal; When the ash hopper pressure difference exceeds 0.2Mpa continuously for 15min, the DCS sends an alarm signal and the fan frequency is increased to 60Hz.

7. The ash storage positive pressure ash leakage early warning method according to claim 6, characterized in that: The following steps are also included: Processing method of monitoring pressure signal of dust collector front ash box: Each bin is equipped with two bag dust collectors, and the ash box pressure signal uses the average pressure of the two bag dust collectors in each bin as the set value for pressure monitoring; A first ash box and a second ash box are arranged in each ash box, and there is a pressure difference between the first ash box and the second ash box; The pressures of the four pressure points of the first gray box are used as the set pressure upper limit value, and the pressure difference between the first gray box and the second gray box is used as the detection pressure signal; The pressure value of the second ash box is used as the set lower limit of pressure; 4 pressure points are set for the 2 bag dust collectors in each warehouse, and the pressure points on each ash box are set to 2 pressure points.

8. An ash silo positive pressure ash leakage early warning system, based on the ash silo positive pressure ash leakage early warning method according to any one of claims 1 to 7, characterized in that: It includes detection module, calculation module, and early warning module; The detection module is used to detect the pressure inside the ash bin, can monitor the pressure changes inside the ash bin in real time, and connect the signal to the DCS system for subsequent processing and early warning; The calculation module is used to set a reasonable pressure threshold according to different ash storage capacities and generate a control signal; The early warning module uses a control signal to complete the early warning of positive pressure ash leakage in the ash bin.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the ash bin positive pressure ash leakage early warning method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the ash bin positive pressure ash leakage early warning method according to any one of claims 1 to 7 are implemented.

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