Intelligent ash conveying control method and system

Abstract

The invention discloses an intelligent ash conveying control method and system.The method comprises the steps that the material level of an ash hopper is collected, then a threshold value is dynamically calculated according to the actual volume of the ash hopper and the material level time sequence characteristic, the ash conveying starting time is accurately matched with the actual ash amount, and the idling rate is reduced; the ash conveying process is automatically triggered to discharge ash out of an ash bucket, overflow caused by excessive ash in the ash bucket is prevented, preparation operations such as preheating a pipeline and checking pressure balance are started when the material level reaches a middle threshold value, the response time of formal ash conveying is shortened, ash conveying is stopped immediately when the material level drops to a low threshold value, a small amount of ash is reserved for buffering, and abrasion of an empty pipe is reduced. According to the method, the problems of extensive control, high consumption and low efficiency of a traditional ash conveying system are fundamentally solved through triple optimization of a dynamic threshold value, staged control and data driving.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of industry, in particular to an intelligent ash conveying control method and system. BACKGROUND

[0002] The ash conveying system is a crucial auxiliary system in the industrial field of thermal power plants, mainly used for conveying the dry fly ash collected in the ash hopper of the electric precipitator to the ash storage yard, ash storage or comprehensive utilization facility through the pipeline of the pneumatic conveying equipment, realizing efficient collection and treatment of the fly ash. The system is widely used in the dry ash treatment link of coal-fired generating units, and is the key infrastructure for ensuring the continuous and safe operation of the boiler and realizing the resource utilization of fly ash. The core function is to monitor and control the ash hopper level, coordinate the ash feeding and conveying process of the warehouse pump, and ensure the stability and economy of the entire ash conveying process.

[0003] The traditional dry ash electric precipitator warehouse pump ash conveying system mainly relies on monitoring devices such as level meters and pressure sensors and fixed logic control strategies to realize operation management, and the ash conveying strategy is extensive. When the ash hopper level is low, the ash conveying is still started according to the fixed cycle, which leads to the idling of the warehouse pump, the aggravation of pipeline wear and tear, and the waste of instrument air consumption. When the level is too high, the ash hopper accumulates ash due to insufficient ash loading time, increasing the risk of ash hopper collapse. Moreover, the energy consumption and equipment wear are high, the ash conveying operation competes for resources with the main process of power generation during high load periods, and the equipment utilization rate is insufficient during low load periods, resulting in high annual power consumption of the air compressor.

[0004] Therefore, how to realize intelligent and efficient ash conveying control for the ash conveying system is a problem that needs to be solved by those skilled in the art. SUMMARY

[0005] In view of the above defects or deficiencies in the prior art, it is desirable to provide an intelligent ash conveying control method and system, which can realize intelligent and efficient ash conveying control.

[0006] In a first aspect, the embodiments of the present application provide an intelligent ash conveying control method, comprising:

[0007] Collecting the ash hopper level;

[0008] Setting a high level threshold, a low level threshold and an intermediate level threshold according to the ash hopper volume and the time sequence characteristic parameters of the ash hopper level;

[0009] When the ash hopper level reaches the high level threshold, starting the ash conveying operation; when the ash hopper level reaches the intermediate level threshold, performing the ash conveying preparation operation; and when the ash hopper level drops to the low level threshold, stopping the ash conveying operation.

[0010] In an embodiment, the intelligent ash conveying control method further comprises:

[0011] Collecting the ash conveying pressure;

[0012] adjusting the dosing time and the cycle number dynamically according to the ash bucket level and the ash conveying pressure.

[0013] In an embodiment, the adjusting the dosing time and the cycle number dynamically according to the ash bucket level and the ash conveying pressure comprises:

[0014] extending the dosing time and / or increasing the cycle number when the ash bucket level is higher than the high level threshold and the ash conveying pressure is lower than the pressure threshold;

[0015] shortening the dosing time and / or decreasing the cycle number when the ash bucket level is lower than the low level threshold and the ash conveying pressure reaches the pressure threshold.

[0016] In an embodiment, the intelligent ash conveying control method further comprises:

[0017] collecting the unit load;

[0018] adjusting the frequency of the ash conveying operation according to the unit load.

[0019] In an embodiment, the adjusting the frequency of the ash conveying operation according to the unit load comprises:

[0020] decreasing the frequency of the ash conveying operation when the unit load reaches a load threshold;

[0021] increasing the frequency of the ash conveying operation when the unit load is lower than the load threshold.

[0022] In an embodiment, the intelligent ash conveying control method further comprises:

[0023] monitoring whether the ash bucket level is abnormal and whether the ash conveying pressure fluctuates in real time during the ash conveying process;

[0024] outputting a warning signal when it is monitored that the ash bucket level is abnormal or the fluctuation is out of the normal fluctuation range.

[0025] In an embodiment, the intelligent ash conveying control method further comprises:

[0026] collecting the unit load;

[0027] switching the ash conveying pipes alternately according to the unit load.

[0028] In an embodiment, the switching the ash conveying pipes alternately according to the unit load comprises:

[0029] if a switching instruction from a first ash conveying pipe to a second ash conveying pipe is generated according to the unit load, pre-charging the second ash conveying pipe;

[0030] detecting whether a pipeline pressure between the second ash conveying pipe and the first ash conveying pipe is less than a switching threshold value;

[0031] if less than the switching threshold value, switching to the second ash conveying pipe for ash conveying operation.

[0032] In a second aspect, the embodiments of the present application provide an intelligent ash conveying control system, comprising:

[0033] a material level sensor, configured to collect an ash hopper material level;

[0034] a processor, configured to set a high material level threshold value, a low material level threshold value and an intermediate material level threshold value according to an ash hopper volume and a time sequence characteristic parameter of the ash hopper material level; start an ash conveying operation when the ash hopper material level reaches the high material level threshold value; perform an ash conveying preparation operation when the ash hopper material level reaches the intermediate material level threshold value; and stop the ash conveying operation when the ash hopper material level falls to the low material level threshold value.

[0035] In an embodiment, the material level sensor is a contact type radio frequency admittance material level meter.

[0036] The contact type radio frequency admittance material level meter is vertically installed in the middle of the ash hopper and is configured to collect the height of the ash hopper material level.

[0037] The intelligent ash conveying control method provided by the present application collects the ash hopper material level, then dynamically calculates the threshold value according to the actual volume of the ash hopper and the time sequence characteristic, avoids the misjudgment of the fixed threshold value under different working conditions, accurately matches the ash conveying starting time with the actual ash amount, and reduces the idling rate. In addition, in the method, the threshold value is controlled in stages through the high material level threshold value, the low material level threshold value and the intermediate material level threshold value, the ash conveying process logic is optimized, the ash slag is automatically discharged from the ash hopper when the material level reaches the high material level threshold value, the overflow caused by too much ash slag in the ash hopper is prevented, the normal operation of the boiler or the dust collector is avoided, the preparation operation such as preheating the pipeline and checking the pressure balance is started when the material level reaches the intermediate threshold value, the response time of the formal ash conveying is shortened, the frequent start and stop of the air compressor and the continuous high load are avoided, the ash conveying is immediately stopped when the material level falls to the low threshold value, a small amount of ash slag is reserved as a buffer, the air pipe wear is reduced, the number of invalid ash conveying is reduced, the air compressor idling energy consumption is avoided, and the system stability and safety are improved. Therefore, the method solves the problems of extensive control and high consumption and low efficiency of the traditional ash conveying system through the triple optimization of dynamic threshold value + stage control + data driving.

[0038] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0039] Other features, objects, and advantages of the application will become more apparent from the following detailed description when read in connection with the following drawings:

[0040] Figure 1 A flow diagram of an intelligent ash conveying control method provided by an embodiment of the application is shown;

[0041] Figure 2 A structural diagram of an air-ash conveying system provided by an embodiment of the application is shown;

[0042] Figure 3 A structural diagram of an intelligent ash conveying control system provided by an embodiment of the application is shown. DETAILED DESCRIPTION

[0043] The application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related application, and not to limit the application. In addition, it should be noted that only the parts related to the application are shown in the drawings for ease of description.

[0044] It should be noted that the embodiments in the application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the drawings and in conjunction with the embodiments. Although the embodiments provided by the embodiments or shown in the drawings provide the method operation instruction steps, more or fewer operation instruction steps can be included in the method based on conventional or non-creative labor. The execution order of the steps is not limited to the execution order provided by the embodiments in the application. The method can be executed in sequence or in parallel when the method is actually processed or the device is executed.

[0045] Embodiment one:

[0046] The embodiment provides an intelligent ash conveying control method, which will be described below with reference to Figure 1 , Figure 1 A flow diagram of an intelligent ash conveying control method provided by an embodiment of the application is shown. As Figure 1 shown, the method mainly includes:

[0047] Step S101, collecting the ash hopper level;

[0048] The ash hopper is an important component for collecting and temporarily storing solid particulate matter such as dust and ash in power plants, industrial boilers and other equipment, as Figure 2 shown is a simple structural diagram of an air-ash conveying system, and the upper end of the conveying pump is a double-hopper ash hopper.

[0049] Ash hopper level refers to the accumulation parameters of dust accumulated in the ash hopper, such as height or volume, which can measure the dust storage in the ash hopper. Through specific detection technology and equipment, the ash accumulation height or filling amount in the ash hopper is obtained in real time, and the ash hopper level is accurately collected, which not only avoids damage to the equipment caused by full-ash hopper, but also optimizes the operation efficiency of the ash conveying system, and is the basic link of the intelligent ash removal system.

[0050] In step S102, high level threshold, low level threshold and intermediate level threshold are set according to the time sequence characteristic parameters of ash hopper volume and ash hopper level.

[0051] The traditional fixed threshold cannot perceive the time-load relationship of ash accumulation in the ash hopper, and may cause the situation that the ash hopper is close to full storage when the high level is triggered or the ash hopper still has residual ash amount when the low level is triggered, and may also cause the situation that the large-volume ash hopper has a too long ash conveying time or the small-volume ash hopper has too frequent ash conveying, thereby increasing the energy consumption of the air compressor, ash conveying fan and other equipment. In the method, the high level threshold, low level threshold and intermediate level threshold are dynamically adjusted according to the ash hopper volume and real-time level, wherein the threshold can be dynamically calculated according to the actual volume of the ash hopper (such as 10 m 3 or 20 m 3 ) by proportion or algorithm, for example: high level threshold = ash hopper volume x dynamic coefficient (such as 0.7 to 0.9, adjusted according to ash conveying efficiency); low level threshold = ash hopper volume x safety coefficient (such as 0.1 to 0.2, to avoid empty hopper operation), which can avoid the situation that the large-volume ash hopper has a too long ash conveying time due to too high threshold (risk of pipe blockage) or the small-volume ash hopper has too frequent ash conveying due to too low threshold (waste of energy consumption); and the threshold is dynamically corrected according to the time sequence characteristic parameters, for example, if the level rises by more than 50% of the volume within 30 minutes, it means that the ash amount increases sharply, and the temporary high level threshold is automatically adjusted to prolong the ash conveying time, thereby adapting to the dynamic change of ash amount caused by unit load fluctuation and coal quality change, and avoiding the failure of fixed threshold in sudden working condition change (such as sudden increase of ash amount when load suddenly increases, which may not trigger the ash conveying in time).

[0052] Specifically, the time sequence characteristic parameters refer to statistical characteristics extracted from historical level data and real-time level data (time sequence), such as change rate (level rising / descending speed per unit time), fluctuation amplitude (maximum value and minimum value difference of level within a certain time), filling period (average time consumption of ash hopper from low level to high level), etc.; the volume of the ash hopper is determined by design parameters (such as shape, diameter, height, taper), which is the physical upper limit reference for threshold setting.

[0053] The specific setting method of the high material level threshold, the low material level threshold and the intermediate material level threshold in the embodiment is not limited, and one threshold setting method is as follows: the high material level threshold is 80% to 95% of the full material level height corresponding to the volume of the ash bucket, and the specific value is determined according to the cumulative distribution frequency of historical material level data; the low material level threshold is 10% to 20% of the full material level height corresponding to the volume of the ash bucket, and is corrected in combination with the stable value of the material level at the end of the ash conveying; the intermediate material level trigger value is 60% to 75% of the high material level threshold, and is dynamically adjusted by ±5% of the fluctuation compensation amount according to the real-time material level change rate (unit: mm / min).

[0054] Of course, when setting the high material level threshold, the low material level threshold and the intermediate material level threshold, the shape of the ash bucket, the pipe diameter and length parameters of the ash conveying pipeline and the like can also be considered, which are not limited in the embodiment, and the corresponding threshold can be set according to the requirements of the actual application scene.

[0055] Step S103, when the ash bucket material level reaches the high material level threshold, the ash conveying operation is started; when the ash bucket material level reaches the intermediate material level threshold, the ash conveying preparation operation is performed; and when the ash bucket material level drops to the low material level threshold, the ash conveying operation is stopped.

[0056] When the ash accumulation height or volume in the ash bucket reaches the high material level threshold, the system automatically triggers the ash conveying process (such as starting the air compressor and opening the ash conveying pipeline valve), and the ash is discharged from the ash bucket, which can prevent the ash in the ash bucket from overflowing due to too much ash, avoid affecting the normal operation of the boiler or dust collector, and ensure that the ash is conveyed in time to avoid pipe blockage or excessive equipment load due to long-term accumulation.

[0057] When the ash bucket material level rises to the intermediate material level threshold, the system performs the preparation work before ash conveying in advance, but does not formally start ash conveying. Avoiding the emergency start of ash conveying when the material level is high, reducing the impact of sudden equipment operation, improving system stability, and shortening the start-up time of formal ash conveying to improve ash conveying efficiency and ensure quick response at high material level. The ash conveying preparation operation includes but is not limited to: starting the air compressor preheating program to stabilize the outlet pressure at 0.4-0.6MPa; opening the ash conveying pipeline purge valve and performing pulse purge for 30 seconds; activating the bin pump feed valve monitoring system to confirm that the valve sealing meets the leakage rate standard of ≤0.1MPa / min.

[0058] When the ash bucket material level drops to the low material level threshold due to ash conveying operation, the system automatically stops the ash conveying process (such as closing the valve and stopping the air compressor). Preventing the ash in the ash bucket from being completely emptied due to excessive ash conveying, avoiding energy waste caused by idling; and retaining a small amount of ash can play a buffering role, reducing the air impact in the ash conveying pipeline, and avoiding possible pipeline wear or pressure fluctuations during air pipeline operation.

[0059] Through phased threshold control, the ash conveying system can realize early warning, orderly response, energy-efficient operation mode, and is more flexible than single threshold start-stop, can dynamically adjust operation according to the change of the ash bucket level, reduce the equipment failure rate and improve the economic efficiency of the system.

[0060] Based on the above introduction, the intelligent ash conveying control method provided by the embodiment can avoid misjudgment of the fixed threshold under different working conditions by collecting the ash bucket level and then dynamically calculating the threshold according to the actual volume and time sequence characteristics of the ash bucket, accurately match the ash conveying starting time with the actual ash amount, and reduce the idling rate. Moreover, in the method, the phased threshold control of the high level threshold, the low level threshold and the intermediate level threshold optimizes the ash conveying process logic. When the level reaches the high level threshold, the ash slag is automatically discharged from the ash bucket to trigger the ash conveying process, which can prevent the ash slag in the ash bucket from overflowing and affecting the normal operation of the boiler or dust collector. When the level reaches the intermediate threshold, the preheating pipeline is started, the pressure balance is checked and other preparation operations are performed, which shortens the response time of formal ash conveying, avoids frequent start-stop and continuous high load of the air compressor, and stops ash conveying when the level drops to the low threshold, leaving a small amount of ash slag as a buffer to reduce the number of invalid ash conveying times, avoid air compressor idling energy consumption, and improve the stability and safety of the system. Therefore, the method solves the problems of extensive control and high energy consumption and low efficiency of the traditional ash conveying system through the triple optimization of dynamic threshold + phased control + data-driven.

[0061] Embodiment Two:

[0062] The specific threshold setting method for the high level threshold, the low level threshold and the intermediate level threshold in the above embodiments is not limited. To deepen the understanding, a specific threshold setting step in an application scenario is introduced in this embodiment.

[0063] Suppose the volume of an ash bucket is 100 cubic meters, the cross section is circular, and the diameter is 4 meters. The following is a specific example of setting the high level threshold, the low level threshold and the intermediate level threshold.

[0064] Analyze historical data: Through statistical analysis of the level data in the past month, it is found that the change of the ash bucket level presents a certain periodicity. The level increases gradually during the operation of the unit, and decreases during the night low-load period when one or more ash conveying operations are performed. At the same time, it is found that when the ash bucket level reaches about 80 cubic meters, the ash conveying process is prone to pipe blockage and other problems; when the level is lower than 20 cubic meters, the ash conveying efficiency is low, and there is a certain energy waste.

[0065] Dynamic adjustment combined with real-time data: In daily operation, the change rate of the material level is monitored in real time. For example, when the unit is running at high load, the material level rises significantly faster. If it is found that the material level has risen by 10 cubic meters in 1 hour and the current material level has reached 60 cubic meters, the high material level threshold can be appropriately reduced according to historical experience and real-time change rate. The originally set 80 cubic meters is adjusted to 75 cubic meters, and the ash conveying operation is started in advance to avoid the risk of pipe blockage due to too fast material level rise.

[0066] Setting threshold: Considering the ash hopper volume, the material level range prone to problems in historical data, and the real-time material level change, the high material level threshold is set to 75 cubic meters (corresponding to an ash hopper height of about 6 meters), and the ash conveying operation is triggered when the ash hopper material level reaches this value. The low material level threshold is set to 25 cubic meters (corresponding to an ash hopper height of about 2 meters), and the ash conveying operation is stopped when the ash hopper material level drops to this value. The intermediate material level threshold is set to 50 cubic meters (corresponding to an ash hopper height of about 4 meters), and the next ash conveying operation is prepared when the ash hopper material level approaches this value, such as starting the related equipment preheating, checking the pipeline state, etc.

[0067] It should be noted that only the above threshold setting method is introduced in this embodiment, and other setting processes can refer to the introduction of this embodiment, which will not be described here.

[0068] Embodiment three:

[0069] In step S101, in addition to collecting the ash hopper material level, the ash conveying pressure, which is the pressure value in the ash conveying pipeline, can also be further collected. In addition to the above steps, step S104 can be further executed to dynamically adjust the ash filling time and the cycle number based on the ash hopper material level and the ash conveying pressure.

[0070] Fixed ash filling time and cycle number cannot cope with ash quantity fluctuations (such as boiler load changes leading to differences in fly ash generation), which may result in insufficient ash filling (waste of conveying resources) or overfilling (risk of pipe blockage). To address this, in addition to controlling the start and stop of the ash conveying operation based on the threshold of the ash hopper material level (high, medium, and low) in the intelligent ash conveying control process, the pressure value in the ash conveying pipeline (ash conveying pressure) can be further collected in real time, and the system operation state can be comprehensively judged based on the material level data, and then the two key parameters can be flexibly adjusted:

[0071] Ash filling time: The time length of the warehouse pump collecting fly ash from the ash hopper, which directly affects the single ash conveying quantity.

[0072] Cycle number: The number of repetitions of a complete ash conveying operation process of the ash conveying system, which affects the overall ash conveying efficiency.

[0073] The embodiment introduces the ash conveying pressure as a supplementary monitoring index, upgrades the single material level threshold control to a material level-pressure double parameter dynamic adjustment, and forms a closed-loop control system of state perception-parameter optimization-process adaptation. Compared with the traditional fixed parameter mode, the embodiment improves the adaptability of the system to complex working conditions through real-time data fusion, and finally realizes the goals of efficient ash conveying, energy saving and consumption reduction, and safe operation, especially suitable for thermal power generation scenes with large load fluctuations and variable characteristics of fly ash.

[0074] The specific adjustment strategy of the ash charging time and the number of cycles in step S104 is not limited in the embodiment. In one embodiment, the following bidirectional dynamic adjustment mechanism can be used to balance efficiency and safety. Step S104 can specifically include the following two sub-steps:

[0075] Step S41, when the ash bucket material level is higher than the high material level threshold and the ash conveying pressure is lower than the pressure threshold, the ash charging time is extended and / or the number of cycles is increased.

[0076] When the ash bucket material level is high and the ash conveying pressure is normal, it indicates that the ash bucket has a lot of accumulated ash and the conveying pipeline is unobstructed. The ash charging time can be extended to increase the single ash conveying amount, reduce the number of cycles, and improve the efficiency.

[0077] Step S42, when the ash bucket material level is lower than the low material level threshold and the ash conveying pressure reaches the pressure threshold, the ash charging time is shortened and / or the number of cycles is reduced.

[0078] When the ash conveying pressure abnormally rises (such as slight blockage of the pipeline), even if the material level does not reach the threshold, it indicates that the ash bucket has little stored ash but the pressure in the pipeline is abnormally high (possibly due to residual ash blockage or poor air flow). The ash charging time can be shortened to avoid the empty running of the bin pump, and the number of cycles can be increased to prevent the pressure from continuously rising and causing pipeline damage and aggravating the blockage of the ash amount.

[0079] The adjustment method establishes a bidirectional mapping relationship between the material level state and the conveying capacity. The material level represents the ash storage demand of the ash bucket, and the pressure represents the conveying capacity of the pipeline. Through the positive adjustment of high material level + low pressure, the single ash charging amount is increased, the number of cycles is reduced, and the running time of the air compressor is reduced, which maximizes the ash conveying efficiency when the conveying capacity is sufficient. Through the reverse adjustment of low material level + high pressure, the ash charging time is shortened and the number of cycles is reduced in abnormal working conditions, which can avoid pipeline wear or equipment overload caused by excessive pressure. This adjustment mechanism is especially suitable for peak shaving units with frequent load fluctuations or coal-fired boilers with variable characteristics of fly ash. It should be noted that other dynamic adjustment mechanisms of ash charging time and cycle number can be referred to the introduction of the embodiment, which will not be described here.

[0080] Embodiment four:

[0081] The conveying frequency in the traditional method is fixed (e.g., starting at a fixed time interval), and cannot be adjusted according to the random group load change. For example, if the conveying of ash is not timely when the load is high, the ash hopper will be filled with ash, and if the conveying of ash is frequent when the load is low, the idle loss will be caused. In view of this, in the embodiment, the conveying demand of ash is associated with the load of the unit in real time, and a closed-loop control of load-ash amount-conveying of ash is formed.

[0082] Specifically, in step S101, in addition to collecting the material level of the ash hopper, the load of the unit can be further collected, which reflects the running state of the generator set. In addition to the above steps, step S105 can be further performed, that is, the frequency of the conveying operation of ash is dynamically adjusted by monitoring the running load (e.g., power generation, boiler combustion intensity, and other parameters) of the generator set in real time.

[0083] The load of the unit is directly related to the amount of coal and the amount of fly ash. For example, the higher the load, the more intense the boiler combustion, and the faster the speed of the ash hopper. In the embodiment, the conveying frequency of ash is adjusted in real time through the load, which can avoid the hysteresis of the traditional fixed-period conveying of ash, and change the conveying system of ash from passive response to material level alarm to active prediction of ash amount demand. This technology not only solves the problems of high energy consumption and large equipment loss in the traditional strategy, but also improves the running stability and economy of the entire power generation system through the resource coordination of the main and auxiliary equipment, which is an intelligent upgrade of industrial automation

[0084] In the embodiment, the specific frequency adjustment logic of the conveying operation of ash is not limited, and specifically, a specific adjustment logic is as follows:

[0085] Step S51, when the load of the unit reaches the load threshold, the frequency of the conveying operation of ash is reduced;

[0086] When the load of the generator set is high, the demand for resources such as compressed air and power of the main equipment (boiler, steam turbine) reaches the peak. The traditional strategy of linearly increasing the conveying frequency of ash may cause the pressure of instrument air to drop suddenly, which affects the action accuracy of the boiler combustion adjusting door. The threshold logic in the embodiment reduces the conveying frequency of ash by actively reducing the frequency, and preferentially allocates resources to the main equipment, which can avoid the competition for resources between the conveying system of ash (e.g., air compressor, warehouse pump) and the main process.

[0087] Step S52, when the load of the unit is lower than the load threshold, the frequency of the conveying operation of ash is increased.

[0088] When the load of the unit is low, the resource consumption of the main equipment is reduced (e.g., excess compressed air), and at this time, increasing the conveying frequency of ash can make full use of the idle resources, and avoid the double problems of resource waste and ash hopper accumulation.

[0089] The above high-load frequency reduction and low-load frequency increase adjustment logic proposed in this embodiment can guarantee the efficiency of the power generation main process, dynamically optimize the operation strategy of the ash conveying system, reduce the ash conveying frequency when the generator set is under high load, and improve the efficiency of the main equipment; increase the ash conveying frequency when the generator set is under low load, use the idle low-pressure gas source (such as the excess pressure of the air compressor) of the main equipment, and reduce the start-stop times of the dedicated ash conveying air compressor, thereby significantly reducing energy consumption and realizing the quantitative improvement of energy consumption and equipment loss. It should be noted that other frequency adjustment mechanisms can refer to the introduction of this embodiment, and will not be described here.

[0090] Embodiment five

[0091] In order to guarantee the safe and stable operation of the system and reduce the operation and maintenance cost, the embodiment proposes that the ash hopper material level and the ash conveying pressure fluctuation can be continuously monitored during the ash conveying process. When any type of data is abnormal (the material level is abnormal or the pressure fluctuation is out of range), the system automatically sends a warning signal (such as an audible and visual alarm, a system prompt, a remote notification, etc.) to remind the operation and maintenance personnel to intervene and handle.

[0092] The ash hopper material level anomaly refers to the deviation of the accumulated ash amount in the ash hopper from the normal range, such as a constant material level, a sudden sharp rise or drop, etc. It may be caused by the blockage of the ash conveying pipeline, the failure of the ash hopper discharge port, the inability to normally convey the accumulated ash, or the shutdown of the ash conveying system, the decrease of the conveying efficiency, the over-limit of the ash hopper, and the like. If not handled in time, it may cause the overload of the ash conveying pipeline and even damage the conveying equipment. The ash conveying pressure fluctuation refers to the fluctuation of the pressure value in the ash conveying pipeline beyond the normal range, such as a sudden sharp rise or drop, frequent and severe fluctuations, etc. It may be caused by excessive ash in the pipeline, pipeline blockage, or abnormal closing of the valve, or pipeline leakage, insufficient gas source pressure, or insufficient ash amount in the ash hopper, which causes the empty running of the conveying medium (such as compressed air). If not handled in time, it may cause the complete blockage of the ash conveying pipeline.

[0093] The monitoring mechanism proposed in this embodiment can prevent the decrease of the conveying efficiency caused by the abnormality, maintain the stable operation of the system, and also can give an early warning at the early stage of the abnormality (such as slight blockage or slight pressure fluctuation), avoid the expansion of the fault to cause the system shutdown, and reduce the frequency of manual inspection and the labor cost.

[0094] Embodiment six

[0095] The traditional power plant ash conveying system is generally configured with multiple ash conveying pipelines, and is usually operated in a mode of fixed pipeline + timed ash conveying, such as single-pipeline continuous operation or multi-pipeline fixed rotation, but when the load fluctuation is large, the fixed ash conveying pipeline bears the same load for a long time, resulting in significant wear difference at positions such as elbows and branch pipes. In order to avoid the above situation and optimize resource allocation, the embodiment proposes to collect the unit load, and then further perform step S106, dynamically switching each ash conveying pipe to alternate ash conveying according to the unit load. According to the real-time collected unit load data, the working states of the multiple ash conveying pipelines are dynamically adjusted, so that they alternately bear the ash conveying task according to a certain logic.

[0096] In the embodiment, the ash conveying pipeline is dynamically associated with the unit load, and the ash conveying pipelines are rotated according to a preset rule (such as time, load interval), so as to ensure uniform wear of each pipeline and avoid wear intensification caused by long-term high-load operation of a single pipeline.

[0097] Specifically, a switching mechanism is as follows: when the unit load is high, the ash amount is large, the single-pipeline ash conveying period is shortened, and single-pipeline overload is avoided; when the unit load is low, the ash amount is reduced, the single-pipeline ash conveying period can be prolonged, and pipeline idling is avoided. A load threshold can be further configured to trigger, and when the load exceeds a certain threshold (such as 60%), the system automatically switches from single-pipeline ash conveying to double-pipeline parallel operation. In addition, an abnormality trigger can be further configured, and when an abnormality (such as pressure fluctuation) occurs in a certain pipeline, the system automatically switches to a standby pipeline to ensure continuous ash conveying. In the embodiment, only the above switching mechanism is taken as an example, and the setting of other mechanisms can refer to the introduction of the embodiment, and will not be described herein.

[0098] In the process of switching each ash conveying pipe to alternate ash conveying, in order to avoid the influence of the switching process on the ash conveying work flow and equipment, the embodiment further proposes a non-impact switching mechanism for the ash conveying pipe. Specifically, a switching step is as follows:

[0099] Step S61: If a switching instruction from the first ash conveying pipe to the second ash conveying pipe is generated according to the unit load, pre-charge the second ash conveying pipe;

[0100] When the system generates a switching instruction (such as switching from the first ash conveying pipe to the second ash conveying pipe) according to the unit load, the second ash conveying pipe is first charged with compressed air, so that the internal pressure gradually rises.

[0101] Step S62: Detect whether the pipeline pressure between the second ash conveying pipe and the first ash conveying pipe is less than a switching threshold;

[0102] The pressure difference between the first and second ash conveying pipes is monitored in real time to determine whether it is less than a preset switching threshold (such as 0.05 MPa).

[0103] Step S63: If it is less than the switching threshold, switch to the second ash conveying pipe for ash conveying operation.

[0104] Only when the pressure difference meets the requirements, the ash conveying pipe switching is performed to ensure the stability of the air flow during the switching process. After the pre-charge pressure, the air flow impact intensity is significantly reduced, and the hidden trouble of pipe blockage is basically eliminated; and the pressure balance switching can reduce the vibration amplitude of the pipeline and improve the service life of the valve

[0105] The embodiment proposes a three-stage switching method of pre-charge pressure-pressure detection-condition switching, wherein the pre-charge pressure process converts the pressure energy at the switching moment into slowly rising potential energy to avoid the concentrated release of impact energy; at the same time, the air flow speed fluctuation in the pipeline is reduced during the switching, so that the suspended conveying state of the fly ash can be maintained to prevent deposition; in addition, through the pressure difference threshold control, the switching influence range is limited in the target pipeline, and other ash conveying loops are not disturbed.

[0106] Example Seven:

[0107] The embodiment provides an intelligent ash conveying control system, as shown in the figure, the system mainly includes: a material level sensor and a processor. The intelligent ash conveying control is realized through two core components. Figure 3

[0108] The material level sensor is used to collect the ash hopper material level, and the commonly used types include radar type, ultrasonic type or weighing type sensor. Preferably, the material level sensor can be a contact type RF admittance material level meter. The contact type RF admittance material level meter measures the admittance value through the RF signal between the probe rod and the ash hopper wall. When the material contacts the probe rod, the change of the admittance value triggers the signal output. The material level meter has strong anti-adhesion ability, and the RF signal can penetrate the slight adhesion layer and is not affected by the material hanging. The measurement stability is high. The bottom of the ash hopper is easily worn by the impact of the material, and the top is easy to accumulate ash to form false signals. The contact type RF admittance material level meter can be vertically installed in the middle of the ash hopper, and the vertical probe rod has a large contact surface with the material, so that accurate ash hopper material level height collection can be realized.

[0109] The processor makes intelligent decisions based on the material level data. The core functions include: setting high material level threshold, low material level threshold and intermediate material level threshold according to the time sequence characteristic parameters of the ash hopper volume and the ash hopper material level; starting the ash conveying operation when the ash hopper material level reaches the high material level threshold; performing the ash conveying preparation operation when the ash hopper material level reaches the intermediate material level threshold; stopping the ash conveying operation when the ash hopper material level drops to the low material level threshold.

[0110] The sensor of the intelligent ash conveying control system provided in the embodiment realizes a closed loop of data collection→time sequence characteristic analysis→threshold dynamic optimization→control strategy execution, upgrades the traditional experience control to data-driven control, and can automatically adapt to the change of ash quantity caused by different unit loads and coal quality characteristics. Under the premise of safety, the optimal balance of energy consumption and equipment life is realized.

[0111] ​It should be noted that the intelligent ash conveying control system provided in this embodiment and the content of the intelligent ash conveying control method provided in the above embodiments can be mutually referred to, and repeated parts will not be described herein.

[0112] The flowcharts and block diagrams in the drawings illustrate the possible architectural, functional, and operational scenarios of the methods and systems according to various embodiments of the present application. In this regard, each block in the flowcharts or block diagrams can represent a module, a program segment, or a portion of code that contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur in a different order than that noted in the figures. For example, two blocks noted in succession can actually be executed substantially concurrently, or they can be executed in reverse order, depending on the functionality involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented by a dedicated hardware-based system that performs specified functions or operational instructions, or they can be implemented by a combination of special-purpose hardware and computer instructions.

[0113] The units or modules involved in the embodiments of the present application can be implemented in a software manner, or in a hardware manner. The described units or modules can also be arranged in a processor. In some cases, the names of the units or modules do not constitute a limitation on the units or modules themselves.

[0114] The above description is merely preferred embodiments of the present application and a description of the principles of the applied technology. Those skilled in the art should understand that the disclosed scope of the present application is not limited to the technical solutions formed by the specific combinations of the above technical features, and should also cover other technical solutions formed by any combinations of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features can be replaced with the technical features disclosed in the present application (but not limited to) having similar functions to form technical solutions.

Claims

1. A method of intelligent ash delivery control, characterized in that, The method comprises: collecting the ash bucket level; setting a high level threshold, a low level threshold and an intermediate level threshold according to the ash bucket volume and the time sequence characteristic parameters of the ash bucket level; starting the ash conveying operation when the ash bucket level reaches the high level threshold; performing the ash conveying preparation operation when the ash bucket level reaches the intermediate level threshold; and stopping the ash conveying operation when the ash bucket level falls to the low level threshold.

2. The method of claim 1, wherein, The method further comprises: collecting the ash conveying pressure; dynamically adjusting the ash filling time and the cycle number according to the ash bucket level and the ash conveying pressure.

3. The method of claim 2, wherein, The dynamically adjusting the ash filling time and the cycle number according to the ash bucket level and the ash conveying pressure comprises: extending the ash filling time and / or increasing the cycle number when the ash bucket level is higher than the high level threshold and the ash conveying pressure is lower than a pressure threshold; shortening the ash filling time and / or reducing the cycle number when the ash bucket level is lower than the low level threshold and the ash conveying pressure reaches the pressure threshold.

4. The method of claim 1, wherein, The method further comprises: collecting the unit load; adjusting the frequency of the ash conveying operation according to the unit load.

5. The method of claim 4, wherein, The adjusting the frequency of the ash conveying operation according to the unit load comprises: decreasing the frequency of the ash conveying operation when the unit load reaches a load threshold; and increasing the frequency of the ash conveying operation when the unit load is lower than the load threshold. The method further comprises:

6. The method of claim 1, wherein, real-time monitoring whether the ash bucket level is abnormal and whether the ash conveying pressure fluctuates during the ash conveying process; outputting a warning signal when it is monitored that the ash bucket level is abnormal or the fluctuation is out of the normal fluctuation range. The method further comprises:

7. The method of claim 1, wherein, collecting the unit load; dynamically switching the ash conveying pipes to alternately convey the ash according to the unit load. The dynamically switching the ash conveying pipes to alternately convey the ash according to the unit load comprises:

8. The method of claim 7, wherein, if a switching instruction from a first ash conveying pipe to a second ash conveying pipe is generated according to the unit load, pre-charging the second ash conveying pipe; detecting whether the pipe pressure between the second ash conveying pipe and the first ash conveying pipe is less than a switching threshold; if the pipe pressure is less than the switching threshold, switching to the second ash conveying pipe to perform the ash conveying operation. The method comprises:

9. An intelligent ash delivery control system characterized by, a level sensor for collecting the ash bucket level; a processor for setting a high level threshold, a low level threshold and an intermediate level threshold according to the ash bucket volume and the time sequence characteristic parameters of the ash bucket level; starting the ash conveying operation when the ash bucket level reaches the high level threshold; performing the ash conveying preparation operation when the ash bucket level reaches the intermediate level threshold; and stopping the ash conveying operation when the ash bucket level falls to the low level threshold. The level sensor is a contact type radio frequency admittance level meter; 10. The system of claim 9, wherein, the contact type radio frequency admittance level meter is vertically installed in the middle of the ash bucket and used for collecting the height of the ash bucket level. ​

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