Ash silo positive pressure ash emission early warning device control method and system

Abstract

The invention discloses a control method and system for an ash silo positive pressure ash emission early warning device, and relates to the technical field of ash silo early warning, and the method comprises the steps: obtaining the operation data of an ash silo, and transmitting the operation data to a controller through a data collection module; analyzing the operation data by using the controller, generating an early warning signal and transmitting the early warning signal to an alarm module and a DCS (Distributed Control System); and early warning is carried out based on the alarm module and the DCS system, so that the positive-pressure ash emission early warning of the ash silo is realized. According to the invention, by using multi-level early warning control, timely early warning of the abnormal condition of the ash silo is realized, delay and omission possibly existing in traditional manual inspection are effectively avoided, and the operation safety and reliability of the ash silo are improved; by monitoring the pressure data and the pressure difference data in the ash silo at the same time, not only can the pressure change trend in the ash silo be accurately reflected, but also the abnormal condition of the bag-type dust removal system can be found in time, and the accuracy and timeliness of early warning are effectively improved.

Description

Technical Field

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

[0002] In industrial development, the power industry plays an important role as a basic energy industry, and the treatment of fly ash generated by coal-fired power plants during the power generation process has always been the focus of industry attention; pneumatic ash conveying system is currently the most commonly used way for power plants to handle fly ash, and the ash bin is the core equipment of the pneumatic ash conveying system; with the continuous improvement of environmental protection requirements, the safe operation and management of ash bins has received increasing attention. Traditional ash bin monitoring mainly relies on manual inspections and simple pressure monitoring, which has become relatively backward today as the degree of industrial automation continues to increase; in recent years, with the development of Internet of Things technology, some power plants have begun to use smart sensors to monitor ash bins in real time, but these monitoring systems are often operated independently and lack a linkage control mechanism with the dust removal system and ash conveying system; at the same time, the existing monitoring system mainly focuses on the monitoring of a single parameter, such as only monitoring the pressure in the ash bin or only monitoring the pressure difference of the dust collector, which cannot fully reflect the operating status of the ash bin, resulting in frequent problems such as untimely warnings or inadequate disposal.

[0003] There are many deficiencies in the existing ash silo positive pressure ash leakage warning method: first, the existing warning system lacks multi-parameter coordinated monitoring and analysis functions, and cannot accurately judge the risk of ash leakage; second, the warning level division is not detailed enough, and often uses a single alarm threshold, resulting in a high false alarm rate, and cannot provide corresponding disposal suggestions for abnormal situations of different degrees; in addition, the existing system is not highly integrated with the DCS system, and automatic linkage control cannot be achieved, and manual intervention is required to complete the corresponding adjustments; finally, the disposal plan after the warning is too simple and lacks specificity, and cannot optimize the ash transportation strategy according to the specific situation of the ash position in the electrostatic precipitator hopper. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is how to provide a method for realizing coordinated control of dust removal fan, bag filter vibration device and ash conveying rate by establishing a multi-level early warning mechanism of pressure data and pressure difference data, and flexibly adjusting the ash conveying strategy according to the ash position of the ash hopper in different electric fields, so as to effectively prevent and control the positive pressure ash buoyancy phenomenon.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In the first aspect, an embodiment of the present invention provides a control method for an ash bin positive pressure dust emission warning device, which includes acquiring operating data of the ash bin, and transmitting the operating data to a controller using a data acquisition module; analyzing the operating data using the controller, generating a warning signal and transmitting it to an alarm module and a DCS system; and issuing a warning based on the alarm module and the DCS system to realize an ash bin positive pressure dust emission warning.

[0008] As a preferred solution of the control method of the ash bin positive pressure ash leakage warning device of the present invention, the operation data of the ash bin includes the pressure data and the pressure difference data in the ash bin.

[0009] As a preferred scheme of the control method of the ash bin positive pressure ash leakage warning device described in the present invention, wherein: the pressure data refers to the use of a pressure sensor to monitor the pressure conditions in the ash bin in real time to obtain pressure data; the pressure difference data refers to adding a pressure difference sensor to the bag dust collector on the top of the ash bin to obtain pressure difference data.

[0010] As a preferred solution of the control method of the ash bin positive pressure ash leakage warning device of the present invention, the warning includes dust removal fan warning, bag filter vibration device warning and ash conveying rate warning.

[0011] As a preferred solution of the control method of the positive pressure ash leakage warning device of the ash bin described in the present invention, the dust removal fan warning includes: judging the pressure data, if the pressure data is less than T1Mpa, adjusting the dust removal fan by using the DCS system so that the dust removal fan runs at A1Hz; if the pressure data is greater than or equal to T1Mpa and less than or equal to T2Mpa, adjusting the dust removal fan by using the DCS system so that the dust removal fan runs at A2Hz; if the pressure data is greater than T2Mpa, a first-level alarm signal is issued by the alarm module, and the operating personnel strengthen observation, and at the same time, the DCS system is used to adjust the dust removal fan so that the frequency of the dust removal fan is increased to A3Hz; judging the pressure difference data, if the pressure difference data is greater than T3Mpa and the duration is greater than N1 minutes, a second-level alarm signal is issued by the alarm module to remind the operating personnel to adjust the ash delivery strategy and reduce the ash delivery amount; if the pressure difference data is greater than T4Mpa and the duration is greater than N2 minutes, a third-level alarm signal is issued by the alarm module to notify the maintenance personnel to check the bag dust removal device.

[0012] As a preferred solution of the control method of the positive pressure ash leakage warning device of the ash bin described in the present invention, the warning of the bag-type dust collector rapping device includes: judging the pressure difference data, if the pressure difference data is less than Q1Mpa, adjusting the bag-type dust collector rapping device by using the DCS system, so that the bag-type dust collector rapping device rapps once every N2 minutes; if the pressure difference data is greater than or equal to Q1Mpa and less than or equal to Q2Mpa, adjusting the bag-type dust collector rapping device by using the DCS system, so that the bag-type dust collector rapping device rapps once every N3 minutes; if the pressure difference data is greater than Q2Mpa, adjusting the bag-type dust collector rapping device by using the DCS system, so that the bag-type dust collector rapping device rapps once every N4 minutes; when the pressure difference increases, that is, when the pressure difference data is from Q1Mpa to Q2Mpa, rapping is performed each time a metering interval is entered; when the pressure difference decreases, that is, when the pressure difference data is from Q2Mpa to Q1Mpa, only the rapping timing is updated.

[0013] As a preferred solution of the control method of the positive pressure ash leakage warning device of the ash bin of the present invention, the ash delivery rate warning includes: judging the pressure difference data, if the pressure difference data is less than Q3Mpa, then the ash delivery strategy is not adjusted; if the pressure difference data is greater than or equal to Q3Mpa, then the ash delivery strategy is adjusted according to the ash level of the electrostatic precipitator ash hopper; if the average material level of the ash hoppers on the two ash delivery pipelines of one electric field is higher than P1m, then the ash delivery of the three electric fields and the four electric fields is stopped to reduce the ash delivery amount; if the average material level of the ash hoppers on one ash delivery pipeline of one electric field is higher than P1m and the other ... If the average material level of the ash hopper on one ash conveying pipeline is lower than P1m, the ash conveying pipeline with the low material level will be shut down; if the ash levels of the electrostatic precipitator ash hoppers on two ash conveying pipelines in one electric field are less than or equal to P2m, both ash conveying pipelines will be shut down; if the ash level of the second electric field is greater than or equal to P3m, then according to the ash level of the first electric field or the ash level of the third electric field and the ash level of the fourth electric field, one ash conveying pipeline in the first electric field or the ash level of the third electric field and the ash level of the fourth electric field will be shut down; if the ash level of the third and fourth electric fields is greater than or equal to P4m, according to the ash level of the first electric field or the ash level of the second electric field, one ash conveying pipeline in the first electric field or the ash level of the second electric field will be shut down.

[0014] On the second aspect, in order to further solve the safety problems existing in the ash bin early warning, the embodiment of the present invention provides a control system for an ash bin positive pressure ash leakage early warning device, which includes: a data acquisition module, which is used to use sensors to monitor the pressure conditions in the ash bin and the pressure difference conditions of the bag dust collector on the top of the ash bin in real time, and obtain pressure data and pressure difference data; a data control module, which is used to use a controller to analyze the pressure data and pressure difference data, generate an early warning signal and transmit it to the alarm module and the DCS system; an early warning module, which is used to use the alarm module and the DCS system to perform dust removal fan early warning, bag dust collector vibration device early warning and ash conveying rate early warning according to the early warning signal.

[0015] In a third aspect, an embodiment of the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, any step of the control method of the ash bin positive pressure ash leakage warning device as described in the first aspect of the present invention is implemented.

[0016] 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 control method of the ash bin positive pressure ash leakage warning device as described in the first aspect of the present invention is implemented.

[0017] Beneficial effects of the present invention: The present invention acquires the ash bin operation data in real time and transmits it to the controller by setting a data acquisition module, generates an early warning signal in combination with the intelligent analysis of the controller, and then implements multi-level early warning control through the alarm module and the DCS system, thereby realizing real-time monitoring of the ash bin operation status and timely early warning of abnormal conditions, effectively avoiding possible delays and omissions in traditional manual inspections, and improving the safety and reliability of ash bin operation; by simultaneously monitoring the two key parameters of pressure data and pressure difference data in the ash bin, a comprehensive operation status monitoring system is constructed, which can not only accurately reflect the pressure change trend inside the ash bin, but also promptly discover abnormal conditions of the bag dust removal system, providing a more reliable and comprehensive judgment basis for the early warning system, and effectively improving the accuracy and timeliness of the early warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 This is an overall flow chart of a control method for a positive pressure ash leakage warning device in an ash bin in Example 1.

[0020] Figure 2 This is a schematic diagram of the structure of the computer device in Example 3. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, 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 accompanying drawings.

[0022] 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.

[0023] 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.

[0024] Example 1

[0025] Reference Figure 1 , which is the first embodiment of the present invention, and provides a control method for a positive pressure ash leakage warning device in an ash bin.

[0026] The existing ash silo positive pressure ash leakage warning method has the following main problems: first, the existing warning system lacks multi-parameter collaborative monitoring and analysis functions, and cannot accurately judge the risk of ash leakage; second, the warning level division is not detailed enough, and often uses a single alarm threshold, resulting in a high false alarm rate, and cannot provide corresponding disposal suggestions for abnormal situations of different degrees; in addition, the existing system is not highly integrated with the DCS system, and automatic linkage control cannot be achieved, and manual intervention is required to complete the corresponding adjustment; finally, the disposal plan after the warning is too simple and lacks pertinence, and cannot optimize the ash transportation strategy according to the specific situation of the ash position in the electrostatic precipitator hopper.

[0027] The present application provides an effective solution to the above-mentioned problems. Next, a plurality of embodiments will be combined to explain in detail how to implement the control method of the ash bin positive pressure ash leakage warning device.

[0028] Figure 1 The overall flow chart of a control method of a positive pressure ash leakage warning device of an ash silo is shown, including:

[0029] S1: Obtain the operating data of the ash bin and transmit the operating data to the controller using the data acquisition module.

[0030] Preferably, the operation data of the ash bin includes pressure data and pressure difference data within the ash bin.

[0031] Specifically, pressure data refers to obtaining pressure data by using a pressure sensor to monitor the pressure conditions in the ash bin in real time.

[0032] Specifically, the pressure difference data refers to a sensor for monitoring the pressure difference added to the bag filter on the top of the ash silo, that is, a pressure difference sensor, to obtain the pressure difference data.

[0033] Preferably, a dual monitoring mechanism is formed by simultaneously collecting two key parameters, pressure data and pressure difference data. Compared with the traditional single pressure monitoring method, since the pressure data can reflect the overall state of the ash bin, and the pressure difference data can accurately reflect the working efficiency of the bag filter, the present invention can more comprehensively evaluate the system operation status and improve the accuracy of the early warning.

[0034] S2: Use the controller to analyze the operating data, generate early warning signals and transmit them to the alarm module and DCS system.

[0035] S3: Early warning is carried out based on the alarm module and DCS system to realize positive pressure ash leakage early warning of ash storage.

[0036] Preferably, the warning includes a dust removal fan warning, a bag filter vibration device warning and an ash conveying rate warning.

[0037] Specifically, the dust removal fan early warning includes: judging the pressure data. If the pressure data is less than T1Mpa, the DCS system is used to adjust the dust removal fan so that the dust removal fan runs at A1Hz.

[0038] If the pressure data is greater than or equal to T1Mpa and less than or equal to T2Mpa, the DCS system is used to adjust the dust removal fan so that the dust removal fan runs at A2Hz.

[0039] If the pressure data is greater than T2Mpa, the alarm module will issue a first-level alarm signal, and the operating personnel will strengthen observation. At the same time, the DCS system will be used to adjust the dust removal fan to increase the frequency of the dust removal fan to A3Hz.

[0040] The pressure difference data is judged. If the pressure difference data is greater than T3Mpa and lasts for more than N1 minutes, the alarm module will send a secondary alarm signal to remind the operating personnel to adjust the ash delivery strategy and reduce the ash delivery amount.

[0041] If the pressure difference data is greater than T4Mpa and lasts for more than N2 minutes, the alarm module will send out a level 3 alarm signal to notify maintenance personnel to check the bag dust removal device.

[0042] Preferably, by establishing a three-level warning mechanism based on pressure and pressure difference thresholds, combining the time dimension and equipment response strategy, a complete decision-making chain is formed. In particular, when the pressure difference data is greater than a certain threshold and lasts for a specific period of time, the system will automatically upgrade the warning level. This design can effectively prevent false alarms caused by short-term fluctuations and improve the reliability of the warning.

[0043] Specifically, the early warning of the bag-type dust collector vibration device includes: judging the pressure difference data. If the pressure difference data is less than Q1Mpa, the DCS system is used to adjust the bag-type dust collector vibration device so that the bag-type dust collector vibration device vibrates once every N2 minutes.

[0044] If the pressure difference data is greater than or equal to Q1Mpa and less than or equal to Q2Mpa, the DCS system is used to adjust the bag dust collector vibration device so that the bag dust collector vibration device vibrates once every N3 minutes.

[0045] If the pressure difference data is greater than Q2Mpa, the DCS system is used to adjust the bag dust collector vibration device so that the bag dust collector vibration device vibrates once every N4 minutes.

[0046] When the pressure difference increases, that is, when the pressure difference data changes from Q1Mpa to Q2Mpa, a vibration is performed each time a metering interval is entered.

[0047] When the pressure difference decreases, that is, when the pressure difference data changes from Q2Mpa to Q1Mpa, only the vibration timing is updated.

[0048] Preferably, the present invention introduces a pressure difference change trend judgment mechanism when processing the vibration frequency of the bag dust collector. When the pressure difference changes from low to high, the system will vibrate in each metering interval; and when the pressure difference drops, only the vibration timing is updated. This differentiated processing method fully considers the working characteristics of the dust removal system, can ensure the dust removal effect while avoiding equipment wear caused by excessive vibration, thereby extending the service life of the equipment.

[0049] Specifically, the ash delivery rate warning includes: judging the pressure difference data, if the pressure difference data is less than Q3Mpa, the ash delivery strategy will not be adjusted.

[0050] If the pressure difference data is greater than or equal to Q3Mpa, the ash transportation strategy will be adjusted according to the ash level of the electrostatic precipitator hopper; if the average material level of the ash hoppers on the two ash transportation pipelines of the first electric field is higher than P1m, the ash transportation of the third and fourth electric fields will be stopped, and the ash transportation amount will be reduced, among which the ash transportation strategy is based on the ash level of the first electric field.

[0051] If the average material level of the ash hopper on one ash conveying pipeline in an electric field is higher than P1m and the average material level of the ash hopper on another ash conveying pipeline is lower than P1m, the ash conveying pipeline with the lower material level will be deactivated.

[0052] If the ash level in the electrostatic precipitator ash hopper of two ash conveying pipelines of an electric field is less than or equal to P2m, then both ash conveying pipelines will be shut down. There are two ash conveying pipelines in one electric field.

[0053] If the ash level of the second electric field is greater than or equal to P3m, then according to the ash level of the first electric field or the ash level of the third electric field and the ash level of the fourth electric field, one ash conveying pipeline of the first electric field or the ash conveying pipeline of the third electric field and the fourth electric field is disabled, where the third electric field and the fourth electric field share one ash conveying pipeline.

[0054] If the ash level of the third and fourth electric fields is greater than or equal to P4m, then one ash conveying pipeline of the first electric field or the second electric field is disabled according to the ash level of the first electric field or the second electric field, where there is one ash conveying pipeline in total for the second electric field.

[0055] Preferably, the present invention adopts a linkage control strategy based on multi-electric field ash levels in the ash conveying rate control, especially by setting an electric field as the control object with the highest priority, and adaptively adjusting the number of ash conveying pipes used according to different electric field ash levels, to form a complete ash conveying volume regulation system, which can not only effectively prevent positive pressure ash leakage in the ash bin, but also ensure the stable operation of the electrostatic precipitator system.

[0056] In summary, the present invention acquires the ash bin operation data in real time and transmits it to the controller by setting a data acquisition module, generates an early warning signal in combination with the intelligent analysis of the controller, and implements multi-level early warning control through the alarm module and the DCS system, thereby realizing real-time monitoring of the ash bin operation status and timely early warning of abnormal conditions, effectively avoiding possible delays and omissions in traditional manual inspections, and improving the safety and reliability of ash bin operation; by simultaneously monitoring the two key parameters of pressure data and pressure difference data in the ash bin, a comprehensive operation status monitoring system is constructed, which can not only accurately reflect the pressure change trend inside the ash bin, but also promptly discover abnormal conditions of the bag dust removal system, providing a more reliable and comprehensive judgment basis for the early warning system, and effectively improving the accuracy and timeliness of the early warning.

[0057] Embodiment 2 is an embodiment of the present invention, which provides a control system for an ash bin positive pressure dust emission warning device, including: a data acquisition module, which is used to use sensors to monitor the pressure conditions in the ash bin and the pressure difference conditions of the bag dust collector on the top of the ash bin in real time, and obtain pressure data and pressure difference data; a data control module, which is used to use a controller to analyze the pressure data and pressure difference data, generate a warning signal and transmit it to the alarm module and the DCS system; a warning module, which is used to use the alarm module and the DCS system to issue a dust removal fan warning, a bag dust collector vibration device warning and an ash conveying rate warning according to the warning signal.

[0058] Embodiment 3 is an embodiment of the present invention, which is different from the previous embodiment in that:

[0059] like Figure 2As shown, if the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0060] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0061] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0062] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0063] Example 4 is an embodiment of the present invention, which provides a control method for a positive pressure ash leakage warning device of an ash bin. In order to verify the beneficial effects of the present invention, a scientific demonstration is carried out through simulation experiments.

[0064] This example simulates a power plant in which a pressure sensor and a differential pressure sensor are connected to the DCS system, develops an early warning platform in the DCS system, and compiles logic to control the output of the bag filter on the top of the ash bin; adjusts the number of ash pipes of different ash conveying units of the two furnaces at the same time to reduce the pressure in the ash bin.

[0065] First, in terms of the dust removal fan, when the pressure data is <0.2Mpa, the dust removal fan runs at 20Hz; when the pressure data is between 0.2Mpa-0.4Mpa, the dust removal fan runs at 35Hz; when the pressure data is >0.4Mpa, a first-level alarm signal is issued, and the operating personnel strengthen observation, and the frequency of the dust removal fan is increased to 50Hz; when the pressure difference data is >0.4Mpa and lasts for more than 30min, a second-level alarm signal is issued to remind the operating personnel to adjust the ash delivery strategy and appropriately reduce the ash delivery amount; when the pressure difference data is >0.4Mpa and lasts for more than 60min, a third-level alarm value signal is issued to notify the maintenance personnel to check the bag dust removal device.

[0066] Secondly, in terms of the bag-type dust collector vibration device, when the pressure difference data is <0.1Mpa, the bag-type dust collector vibration device vibrates once every half an hour; when the pressure difference data is between 0.1Mpa-0.3Mpa, the bag-type dust collector vibration device vibrates once every 15 minutes; when the pressure difference data is >0.3Mpa, the bag-type dust collector vibration device vibrates once every 10 minutes; when the pressure difference data increases, that is, from 0.1Mpa to 0.3Mpa, the bag-type dust collector vibration device vibrates once each time it enters a metering interval; when the pressure difference data decreases, that is, from 0.3Mpa to 0.1Mpa, only the vibration timing is updated.

[0067] Finally, in terms of ash conveying rate, when the pressure difference data of the ash storage is <0.3Mpa, the ash conveying strategy is not adjusted; when the pressure difference data is >0.3Mpa, the ash conveying strategy is adjusted according to the ash level of the electrostatic precipitator ash hopper; when the average material level of the ash hoppers on the two ash conveying pipelines of one electric field is higher than 1.5m, the ash conveying of the third and fourth electric fields is stopped and the ash conveying amount is reduced, among which all ash conveying strategies are based on the ash level of one electric field; when the average material level of the ash hopper on one ash conveying pipeline of one electric field is higher than 1.5m and the average material level of the ash hopper on the other ash conveying pipeline is lower than 1.5m, the ash conveying pipeline with the low material level is stopped; When the ash level of the electrostatic precipitator ash hoppers in the two ash conveying pipelines of the first electric field is less than or equal to 0.9m, both ash conveying pipelines will be shut down, and there are two ash conveying pipelines in the first electric field; when the ash level of the second electric field is higher than 1.7m, one ash conveying pipeline of the first electric field or the ash level of the third and fourth electric fields will be shut down according to the ash level of the first electric field or the ash level of the third and fourth electric fields, and the third and fourth electric fields share one ash conveying pipeline; when the ash level of the third and fourth electric fields is higher than 1.8m, one ash conveying pipeline of the first electric field or the ash level of the second electric field will be shut down according to the ash level of the first electric field or the ash level of the second electric field, and there is one ash conveying pipeline in the second electric field.

[0068] By utilizing the above scheme to give an early warning of positive pressure ash leakage in the ash bin and collecting relevant data, it can be found that 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 of the ash bin dust removal fan was reduced by 20,000 yuan / year, and the maintenance cost of the ash bin bag dust removal device was reduced by 64,000 yuan / year. This shows that the present invention can effectively give an early warning 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.

[0069] 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 control method for a positive pressure ash leakage warning device of an ash silo, characterized in that: include: Acquire the operation data of the ash bin, and transmit the operation data to the controller by using the data acquisition module; Analyzing the operation data using the controller, generating a warning signal and transmitting the warning signal to an alarm module and a DCS system; Early warning is carried out based on the alarm module and the DCS system to realize the positive pressure ash leakage early warning of the ash storage.

2. The control method of the ash silo positive pressure ash leakage warning device according to claim 1, characterized in that: The operation data of the ash bin includes pressure data and pressure difference data in the ash bin.

3. The control method of the ash silo positive pressure ash leakage warning device according to claim 2, characterized in that: The pressure data refers to the use of a pressure sensor to monitor the pressure in the ash bin in real time and obtain pressure data; The pressure difference data refers to adding a pressure difference sensor to the bag dust collector on the top of the ash bin to obtain the pressure difference data.

4. The control method of the ash silo positive pressure ash leakage warning device according to claim 3 is characterized in that: The early warning includes dust removal fan early warning, bag filter vibration device early warning and ash conveying rate early warning.

5. The control method of the ash silo positive pressure ash leakage warning device according to claim 4, characterized in that: The dust removal fan warning includes: The pressure data is judged. If the pressure data is less than T1Mpa, the DCS system is used to adjust the dust removal fan so that the dust removal fan runs at A1Hz; If the pressure data is greater than or equal to T1Mpa and less than or equal to T2Mpa, the DCS system is used to adjust the dust removal fan so that the dust removal fan operates at A2Hz; If the pressure data is greater than T2Mpa, the alarm module will issue a first-level alarm signal, and the operator will strengthen observation. At the same time, the DCS system will be used to adjust the dust removal fan to increase the frequency of the dust removal fan to A3Hz; The pressure difference data is judged. If the pressure difference data is greater than T3Mpa and lasts for more than N1 minutes, a secondary alarm signal is issued by the alarm module to remind the operator to adjust the ash conveying strategy and reduce the ash conveying amount; If the pressure difference data is greater than T4Mpa and lasts for more than N2 minutes, the alarm module will send out a level 3 alarm signal to notify maintenance personnel to check the bag dust removal device.

6. The control method of the ash silo positive pressure ash leakage warning device according to claim 5, characterized in that: The bag filter vibration device early warning includes: The pressure difference data is judged. If the pressure difference data is less than Q1Mpa, the bag dust collector vibration device is adjusted by using the DCS system so that the bag dust collector vibration device vibrates once every N2 minutes; If the pressure difference data is greater than or equal to Q1Mpa and less than or equal to Q2Mpa, the bag dust collector vibration device is adjusted using the DCS system to make the bag dust collector vibration device vibrate once every N3 minutes; If the pressure difference data is greater than Q2Mpa, the DCS system is used to adjust the bag filter vibration device so that the bag filter vibration device vibrates once every N4 minutes; When the pressure difference increases, that is, when the pressure difference data changes from Q1Mpa to Q2Mpa, a vibration is performed each time a metering interval is entered; When the pressure difference decreases, that is, when the pressure difference data changes from Q2Mpa to Q1Mpa, only the vibration timing is updated.

7. The control method of the ash silo positive pressure ash leakage warning device according to claim 6, characterized in that: The ash conveying rate early warning includes: The pressure difference data is judged, and if the pressure difference data is less than Q3Mpa, the ash conveying strategy is not adjusted; If the pressure difference data is greater than or equal to Q3Mpa, the ash conveying strategy is adjusted according to the ash level of the electrostatic precipitator ash hopper; if the average material level of the ash hoppers on the two ash conveying pipelines of the first electric field is higher than P1m, the ash conveying of the third and fourth electric fields is stopped to reduce the ash conveying amount; If the average material level of the ash hopper on one ash conveying pipeline in an electric field is higher than P1m and the average material level of the ash hopper on another ash conveying pipeline is lower than P1m, the ash conveying pipeline with the lower material level shall be deactivated; If the ash level of the electrostatic precipitator ash hopper in two ash conveying pipelines of one electric field is less than or equal to P2m, both ash conveying pipelines shall be shut down; If the second electric field ash level is greater than or equal to P3m, then according to the first electric field ash level or the third electric field ash level and the fourth electric field ash level, one of the first electric field ash conveying pipelines or the third electric field and the fourth electric field ash conveying pipelines are stopped; If the ash level of the third and fourth electric fields is greater than or equal to P4m, one of the first electric field ash transport pipelines or the second electric field ash transport pipelines is disabled according to the ash level of the first electric field or the ash level of the second electric field.

8. A control system for a positive pressure ash leakage warning device in an ash silo, based on the control method for a positive pressure ash leakage warning device in an ash silo according to any one of claims 1 to 7, characterized in that: include, The data acquisition module is used to use sensors to monitor the pressure in the ash bin and the pressure difference of the bag dust collector on the top of the ash bin in real time, and obtain pressure data and pressure difference data; The data control module is used to analyze the pressure data and pressure difference data using the controller, generate early warning signals and transmit them to the alarm module and DCS system; The early warning module is used to use the alarm module and DCS system to provide early warning for the dust removal fan, the vibration device of the bag filter and the ash conveying rate according to the early warning signal.

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 control method of the ash bin positive pressure ash leakage warning device 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 control method of the ash bin positive pressure ash leakage warning device according to any one of claims 1 to 7 are implemented.

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