A multi-tank cooperative fluid flow dynamic regulation system and method

Abstract

The present application relates to the technical field of blast furnace pig iron smelting, and particularly relates to a multi-tank coordinated fluid flow dynamic regulation system and method, the system comprising: a coal powder quantity monitoring module; an early warning module; an analysis module; a fluidization monitoring module; and an emergency early warning module; in the present application, the system tracks the remaining quantity of the main coal injection tank in real time through the coal powder quantity monitoring module, and starts the standby tank switching process in advance when the coal powder is insufficient, so that coal supply interruption caused by coal powder depletion is avoided, and the dynamic adjustment of the pre-stop process is determined through the'strong / weak replacement tendency type' in view of abnormal pressure fluctuation or irregular coal injection quantity change of the main coal injection tank, so that seamless connection of the main tank and the standby tank is ensured, the emergency fluidization mode of the vice standby coal injection tank serves as 'double protection', and is quickly started when the fluidization effect of the main tank and the standby tank is substandard, so that the production stagnation risk caused by single tank failure is further reduced, and the analysis module dynamically adjusts the fluidization duration of the main tank and the standby tank based on the pressure fluctuation variance of the main tank, so that energy consumption caused by excessive fluidization is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace pig iron smelting, in particular to a multi-tank coordinated fluid flow dynamic regulation system and method. BACKGROUND

[0002] The coal injection tank provides the necessary energy and materials for the combustion and reaction process by injecting coal powder into the reaction device at a suitable flow rate and pressure. With the continuous expansion of industrial production scale and the increasing complexity of production process, higher requirements are put forward for the operation reliability and flow regulation accuracy of the coal injection tank. The existing technology improves the utilization efficiency and injection reliability of the injection tank by setting a powder conveying branch pipe between the front and rear coal outlet valves, realizing the instantaneous conversion of the powder conveying function to the injection function of the injection tank. However, the traditional coal injection tank cannot accurately monitor the remaining amount of coal powder in real time, resulting in interruption or excess of coal powder supply.

[0003] Chinese patent application No. CN202211455529.3 discloses a three-tank coal injection system and control method capable of simultaneously injecting and scheduling coal powder, which includes multiple coal powder preparation systems, each of which is connected with a corresponding coal powder bin; the coal powder bins are connected with blast furnace tuyeres through injection tanks; the injection tanks include injection tank one, injection tank two, and injection tank three; each of the injection tank one, injection tank two, and injection tank three is connected with an injection main pipe through a front coal outlet valve and a rear coal outlet valve; the injection main pipe is connected with the blast furnace tuyere through a coal flow regulating valve, a coal powder flow meter, a coal outlet main valve, and a coal powder distributor in sequence according to the injection direction of the coal powder; a powder conveying branch pipe is further arranged between the front and rear coal outlet valves, the powder conveying branch pipe is connected with a powder conveying main pipe through a powder conveying branch valve, and the powder conveying main pipe is connected with the coal powder bin of another coal powder preparation system through a powder conveying main valve. The present scheme improves the utilization efficiency and injection reliability of the injection tank, and realizes the instantaneous conversion of the powder conveying function to the injection function of the injection tank.

[0004] However, the existing technology still has the following problems:

[0005] The traditional coal injection tank cannot accurately monitor the remaining amount of coal powder in real time, resulting in interruption or excess of coal powder supply. SUMMARY

[0006] Therefore, the present application provides a multi-tank coordinated fluid flow dynamic regulation system and method to overcome the problem that the traditional coal injection tank in the prior art cannot accurately monitor the remaining amount of coal powder in real time, resulting in interruption or excess of coal powder supply.

[0007] To achieve the above-mentioned purpose, the present application provides a multi-tank coordinated fluid flow dynamic regulation system, which comprises:

[0008] A coal powder amount monitoring module is used to monitor the remaining amount of coal powder in the main coal injection tank in real time;

[0009] an early warning module connected with the coal powder amount monitoring module, used to determine the replacement tendency type of the main coal injection tank based on abnormal pressure fluctuation and irregular change of coal injection amount inside the main coal injection tank;

[0010] an analysis module connected with the early warning module, used to determine the operation parameters of the main and standby coal injection tanks based on the replacement tendency type determined by the early warning module, including:

[0011] determining the fluidization time length of the main and standby coal injection tanks based on the pressure fluctuation of the main coal injection tank, and determining whether to start coal powder suspension strengthening based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main and standby coal injection tanks,

[0012] or, running the main and standby coal injection tanks according to initial fluidization parameters;

[0013] a fluidization monitoring module connected with the analysis module, used to monitor the particle motion intensity inside the main and standby coal injection tanks;

[0014] an emergency early warning module connected with the fluidization monitoring module, used to analyze whether to start the secondary standby coal injection tank according to the particle motion intensity inside the main and standby coal injection tanks.

[0015] Further, the early warning module is used to determine the replacement tendency type of the main coal injection tank based on abnormal pressure fluctuation and irregular change of coal injection amount inside the main coal injection tank, wherein,

[0016] if there is abnormal pressure fluctuation inside the main coal injection tank and / or there is irregular change of coal injection amount, it is determined that the main coal injection tank is of strong replacement tendency type;

[0017] if there is no abnormal pressure fluctuation inside the main coal injection tank and / or there is no irregular change of coal injection amount, it is determined that the main coal injection tank is of weak replacement tendency type.

[0018] Further, the analysis module is used to determine the operation parameters of the main and standby coal injection tanks based on the replacement tendency type determined by the early warning module, including:

[0019] if the main coal injection tank is of strong replacement tendency type, the fluidization time length of the main and standby coal injection tanks is determined based on the pressure fluctuation of the main coal injection tank, and whether to start coal powder suspension strengthening is determined based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main and standby coal injection tanks,

[0020] if the main coal injection tank is of weak replacement tendency type, the main and standby coal injection tanks are run according to initial fluidization parameters.

[0021] Further, the analysis module is used to determine the fluidization time length of the main and standby coal injection tanks based on the pressure fluctuation of the main coal injection tank, wherein,

[0022] drawing a time node-pressure curve based on historical pressure fluctuation data of the main coal injection tank,

[0023] determining a pressure change amplitude of each time node and a previous time node,

[0024] solving a variance of the pressure change amplitude,

[0025] determining a fluidization duration of the main and standby coal injection tank based on the variance,

[0026] wherein an increase amount of the fluidization duration is positively correlated with the variance.

[0027] Further, the analysis module is used to determine whether to start the pulverized coal suspension strengthening based on a time interval between a pre-stop time node of the main coal injection tank and a pre-start time node of the main and standby coal injection tank, comprising:

[0028] if the time interval is greater than or equal to a preset time interval, starting the pulverized coal suspension strengthening;

[0029] if the time interval is less than the preset time interval, not starting the pulverized coal suspension strengthening.

[0030] Further, the emergency warning module is used to analyze whether to start the secondary standby coal injection tank according to the particle motion intensity inside the main and standby coal injection tank, comprising:

[0031] if the particle motion intensity is greater than or equal to a preset particle motion intensity, starting the secondary standby coal injection tank;

[0032] if the particle motion intensity is less than the preset particle motion intensity, not starting the secondary standby coal injection tank.

[0033] Further, the warning module further comprises:

[0034] a pressure fluctuation warning unit, which is used to monitor the pressure fluctuation inside the main coal injection tank;

[0035] a coal injection amount warning unit, which is used to monitor the coal injection amount of the main coal injection tank.

[0036] Further, the pressure fluctuation warning unit is used to analyze whether the main coal injection tank has abnormal pressure fluctuation based on the pressure fluctuation amplitude inside the main coal injection tank, wherein,

[0037] if the pressure fluctuation amplitude is greater than or equal to a preset pressure fluctuation amplitude, determining that the main coal injection tank has abnormal pressure fluctuation;

[0038] if the pressure fluctuation amplitude is less than the preset pressure fluctuation amplitude, determining that the main coal injection tank has normal pressure fluctuation.

[0039] Further, the emergency warning module is used to close the outlet valve of the main coal injection tank to isolate the fault tank when the condition of starting the auxiliary backup coal injection tank is determined, the auxiliary backup coal injection tank directly starts the emergency fluidization mode, and the main backup coal injection tank maintains the fluidization state.

[0040] The application provides a multi-tank coordinated fluid flow dynamic regulation method.

[0041] Step S1, the residual amount of pulverized coal in the main coal injection tank is monitored in real time, and when the residual amount of pulverized coal is lower than the preset residual amount of pulverized coal, the pressure fluctuation condition in the main coal injection tank and the change condition of the coal injection amount are detected;

[0042] Step S2, the replacement tendency type of the main coal injection tank is determined based on the abnormal pressure fluctuation in the main coal injection tank and the irregular change condition of the coal injection amount, and the operation parameter of the main backup coal injection tank is determined based on the replacement tendency type of the main coal injection tank, including:

[0043] The fluidization time length of the main backup coal injection tank is determined based on the pressure fluctuation condition of the main coal injection tank, and whether to start the pulverized coal suspension strengthening is determined based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main backup coal injection tank,

[0044] or, the main backup coal injection tank is operated according to the initial fluidization parameter;

[0045] Step S3, the particle motion intensity in the internal flow process of the main backup coal injection tank is monitored by using a sound wave sensor, so as to analyze whether to start the auxiliary backup coal injection tank according to the particle motion intensity;

[0046] Step S4, the fluid flow dynamic regulation for the coal injection tank is completed.

[0047] Compared with the prior art, the application has the beneficial effects that in the application, the system tracks the residual amount of the main coal injection tank in real time through the pulverized coal amount monitoring module, the backup tank switching process is started in advance when the pulverized coal is insufficient, the coal supply interruption caused by the exhaustion of the pulverized coal is avoided, the pre-stop process is dynamically adjusted through the "strong / weak replacement tendency type" determination according to the abnormal pressure fluctuation of the main coal injection tank or the irregular change of the coal injection amount, the seamless connection of the main backup tank is ensured (such as accelerating the switching when the replacement tendency is strong, and delaying to fully utilize the pulverized coal in the main tank when the replacement tendency is weak), and the emergency fluidization mode of the auxiliary backup coal injection tank serves as "double protection" and is quickly started when the fluidization effect of the main backup tank does not meet the standard, so that the production stagnation risk caused by the single-tank fault is further reduced.

[0048] Further, in the present application, the replacement tendency type of the main coal injection tank is determined according to the pressure fluctuation condition inside the main coal injection tank and the coal injection amount change condition, when the main coal injection tank is of a strong replacement tendency type, the potential failure risk of the main coal injection tank (such as sudden pressure change may indicate pipeline blockage, irregular change of coal injection amount may reflect abnormal coal supply system) is identified in time, a more urgent standby tank switching process (such as accelerating the main tank pre-stop, prolonging the fluidization time of the standby tank) is triggered to avoid coal supply interruption caused by failure expansion, when the main coal injection tank is of a weak replacement tendency type, it indicates that the main coal injection tank is still in a relatively stable operating state, at this time, the switching process can be delayed (such as making full use of the remaining coal powder in the main tank, starting the standby tank according to the initial parameters), to avoid resource waste caused by early switching (such as increased energy consumption of frequent starting of the standby tank, increased cleaning cost of residual coal powder in the main tank).

[0049] Further, in the present application, considering that the strong replacement tendency type usually corresponds to the existence of pressure abnormality or coal injection amount fluctuation of the main coal injection tank, at this time, the fluidization time is calculated by the variance of the main tank pressure fluctuation (the larger the variance, the longer the fluidization time), the fluidization effect of the main and standby tanks can be targetedly strengthened (such as prolonging the fluidization time when the pressure fluctuation is severe to ensure that the coal powder is fully suspended), to avoid the unstable state of the main tank being transmitted to the standby tank, and to ensure the continuity of the coal supply parameters after switching, whether to start coal powder suspension strengthening is determined based on the time interval between the pre-starting of the main and standby tanks and the pre-stop of the main tank, which not only avoids resource waste when there is sufficient time (such as not starting when the interval is short, running according to the normal process), but also ensures the stability of the coal powder state when the interval is long (such as preventing coal powder deposition and arching by strengthening suspension), balancing stability and economy.

[0050] Further, in the present application, by calculating the variance of the pressure change amplitude, the "dispersion degree" of the main tank pressure fluctuation is converted into a quantifiable index, the larger the variance, the more unstable the pressure (such as pipeline blockage, coal powder arching, etc.), at this time, prolonging the fluidization time of the standby tank can fully eliminate the coal powder agglomeration, improve the coal supply stability of the standby tank, and identify the potential failure of the main tank in advance (such as when the variance exceeds the threshold), by prolonging the fluidization time of the standby tank, "store up against an emergency", reduce the probability of coal supply abnormality of the standby tank after switching, ensure that the standby tank meets the requirements quickly in an emergency through the suspension strengthening mechanism, reduce the risk of coal supply interruption caused by insufficient switching time, especially suitable for high furnace coal injection and other scenes with extremely high continuity requirements.

[0051] Further, in the present application, when the emergency fluidization mode is started, high wind volume and pressure can quickly break the coal powder agglomeration, even if the main and standby tanks do not meet the standard (such as insufficient particle movement intensity), the vice standby tank can still quickly reach the stable coal supply condition through the emergency mode, to avoid production accidents such as high furnace temperature fluctuation caused by coal supply interruption. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1The application discloses a multi-tank cooperative fluid flow dynamic regulation system.

[0053] Figure 2 The application discloses a multi-tank cooperative fluid flow dynamic regulation method.

[0054] Figure 3 The application discloses a determination flowchart for determining a replacement tendency type of a main coal injection tank.

[0055] Figure 4 The application discloses a determination flowchart for determining operation parameters of a main and standby coal injection tank. DETAILED DESCRIPTION

[0056] In order to make the objects and advantages of the application clearer, the application will be further described below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the application and should not be used to limit the application.

[0057] It should be noted that the data in the embodiments are obtained by comprehensively analyzing and evaluating the historical data of the past six months and the corresponding historical determination results before the determination by the system. Those skilled in the art can understand that the determination method of the system for a single parameter can be to select the value with the highest proportion as the preset standard parameter according to the data distribution, to use weighted summation to obtain the value as the preset standard parameter, to substitute the historical data into a specific formula and to obtain the value by using the formula as the preset standard parameter, or other selection methods, as long as the system can clearly define different specific conditions in the single determination process by the obtained value.

[0058] The preferred embodiments of the application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the embodiments are only used to explain the technical principles of the application and are not used to limit the protection scope of the application.

[0059] It should be noted that, in the description of the application, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicate the direction or positional relationship terms based on the direction or positional relationship shown in the drawings, which are only used for the convenience of description and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application.

[0060] Moreover, it needs to be explained that in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "linking" should be understood in a broad sense and for example, can be fixed connection, can also be detachable connection, or integral connection; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through intermediate medium, and can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] Please refer to Figures 1-4 as shown, Figure 1 the multi-tank coordinated fluid flow dynamic regulation system of the present application, Figure 2 the multi-tank coordinated fluid flow dynamic regulation method, Figure 3 the determination flow chart for determining the replacement tendency type of the main coal injection tank, Figure 4 the determination flow chart for determining the operation parameters of the main and standby coal injection tanks.

[0062] The multi-tank coordinated fluid flow dynamic regulation system provided by the embodiment comprises:

[0063] a pulverized coal amount monitoring module, which is used to monitor the residual amount of pulverized coal in the main coal injection tank in real time;

[0064] a warning module connected with the pulverized coal amount monitoring module, which is used to determine the replacement tendency type of the main coal injection tank based on abnormal fluctuation of the pressure in the main coal injection tank and irregular change of the coal injection amount;

[0065] an analysis module connected with the warning module, which is used to determine the operation parameters of the main and standby coal injection tanks based on the replacement tendency type determined by the warning module, comprising:

[0066] determining the fluidization time length of the main and standby coal injection tanks based on the pressure fluctuation of the main coal injection tank, and determining whether to start the pulverized coal suspension intensification based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main and standby coal injection tanks,

[0067] or, operating the main and standby coal injection tanks according to the initial fluidization parameters;

[0068] a fluidization monitoring module connected with the analysis module, which is used to monitor the particle motion intensity in the main and standby coal injection tanks;

[0069] an emergency warning module connected with the fluidization monitoring module, which is used to analyze whether to start the secondary standby coal injection tank according to the particle motion intensity in the main and standby coal injection tanks.

[0070] Specifically, the specific structure of the analysis module is not limited, which can be composed of a logic component, including a field programmable processor, a computer and a microprocessor in the computer.

[0071] Specifically, in this embodiment, the non-regular variation of the coal injection amount is determined by collecting historical data of the coal injection amount, drawing a curve of the coal injection amount changing with time, analyzing the change trend, fluctuation amplitude and frequency, etc., and determining that there is a non-regular variation if the change trend and fluctuation characteristics of the current coal injection amount data are significantly different from the historical normal data or the fluctuation amplitude exceeds the preset threshold.

[0072] The multi-tank coordinated fluid flow dynamic regulation method provided in this embodiment comprises:

[0073] Step S1, the residual amount of coal powder in the main coal injection tank is monitored in real time, and when the residual amount of coal powder is lower than the preset residual amount of coal powder, the pressure fluctuation in the main coal injection tank and the variation of the coal injection amount are detected;

[0074] Step S2, the replacement tendency type of the main coal injection tank is determined based on the abnormal pressure fluctuation in the main coal injection tank and the non-regular variation of the coal injection amount, and the operation parameters of the main and standby coal injection tanks are determined based on the replacement tendency type of the main coal injection tank, comprising:

[0075] the fluidization time of the main and standby coal injection tanks is determined based on the pressure fluctuation of the main coal injection tank, and whether to start the coal powder suspension strengthening is determined based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main and standby coal injection tanks,

[0076] or, the main and standby coal injection tanks are operated according to the initial fluidization parameters;

[0077] Step S3, the particle motion intensity in the internal flow process of the main and standby coal injection tanks is monitored by using a sound wave sensor, so as to analyze whether to start the secondary standby coal injection tank according to the particle motion intensity;

[0078] Step S4, the fluid flow dynamic regulation for the coal injection tank is completed.

[0079] Specifically, in this embodiment, when it is monitored in real time that the residual amount of coal powder in the main coal injection tank is lower than the preset residual amount of coal powder, the pre-stop time node of the main coal injection tank is considered, and this preset value can be set according to the capacity of the coal injection tank, the coal injection amount per unit time and the minimum demand of the production process for the coal powder, for example, if the capacity of the coal injection tank is 100 tons, the coal injection amount per unit time is 5 tons / hour, and the production process requires that the coal powder amount cannot be lower than 10 tons to ensure continuous production, then the preset residual amount of coal powder can be set to 10 tons, and when the residual amount of coal powder decreases to 10 tons, the pre-stop judgment process is started.

[0080] Specifically, in this embodiment, after the residual amount of pulverized coal is lower than the preset value, the pressure fluctuation inside the main coal injection tank and the change of the coal injection amount are detected, if there is abnormal pressure fluctuation (the pressure fluctuation amplitude is greater than or equal to the preset pressure fluctuation amplitude) and / or the coal injection amount has irregular change (the change trend and fluctuation characteristics of the current coal injection amount data are significantly different from the historical normal data, or the fluctuation amplitude exceeds the preset threshold), the pre-stop process of the main coal injection tank is accelerated; if the pressure and the coal injection amount are relatively stable, the pre-stop time of the main coal injection tank can be appropriately delayed, and the pre-start time node of the standby coal injection tank needs to be considered comprehensively to ensure that the standby coal injection tank can complete the start preparation and put into use before the main coal injection tank stops working, generally a time interval threshold between the pre-stop time node of the main coal injection tank and the pre-start time node of the standby coal injection tank is set, if the time interval is greater than or equal to the preset time interval, the standby coal injection tank is started in advance, and the pulverized coal suspension strengthening is started according to the situation; if the time interval is less than the preset time interval, the standby coal injection tank is started according to the normal process.

[0081] In the present application, the system tracks the residual amount of the main coal injection tank in real time through the pulverized coal amount monitoring module, and starts the standby tank switching process in advance when the pulverized coal is insufficient, to avoid coal supply interruption caused by depletion of pulverized coal, and dynamically adjusts the pre-stop process through the "strong / weak replacement tendency type" determination according to the abnormal pressure fluctuation of the main coal injection tank or the irregular change of the coal injection amount, to ensure seamless connection of the main and standby tanks (such as accelerating the switching when the strong replacement tendency occurs, and delaying the switching when the weak tendency occurs to fully utilize the pulverized coal in the main tank), and the emergency fluidization mode of the secondary standby coal injection tank as "double protection" to start quickly when the fluidization effect of the main and standby tanks does not meet the standard, to further reduce the risk of production stagnation caused by single tank failure.

[0082] Specifically, the pre-warning module is used to determine the replacement tendency type of the main coal injection tank based on the abnormal pressure fluctuation inside the main coal injection tank and the irregular change of the coal injection amount, wherein,

[0083] If there is abnormal pressure fluctuation inside the main coal injection tank and / or irregular change of the coal injection amount, the main coal injection tank is determined to be a strong replacement tendency type;

[0084] If there is no abnormal pressure fluctuation inside the main coal injection tank and / or irregular change of the coal injection amount, the main coal injection tank is determined to be a weak replacement tendency type.

[0085] In the present application, the replacement tendency type of the main coal injection tank is determined according to the pressure fluctuation condition and the coal injection amount change condition inside the main coal injection tank. When the main coal injection tank is of a strong replacement tendency type, the potential failure risk of the main coal injection tank (for example, a sudden pressure change may indicate a pipeline blockage, and an irregular change in the coal injection amount may reflect an abnormal coal supply system) is identified in a timely manner, a more urgent standby tank switching process (for example, the main tank pre-stop is accelerated, and the fluidization time length of the standby tank is extended) is triggered, the coal supply interruption caused by the expansion of the failure is avoided, and when the main coal injection tank is of a weak replacement tendency type, it indicates that the main coal injection tank is still in a relatively stable operating state, at this time, the switching process can be delayed (for example, the remaining coal powder of the main tank is fully utilized, and the standby tank is started according to the initial parameters), and the waste of resources caused by early switching (for example, the energy consumption of the frequent start of the standby tank is increased, and the cleaning cost of the residual coal powder of the main tank is increased) is avoided.

[0086] Specifically, the analysis module is used to determine the operating parameters of the main and standby coal injection tanks based on the replacement tendency type determined by the early warning module, including:

[0087] If the main coal injection tank is of a strong replacement tendency type, the fluidization time length of the main and standby coal injection tanks is determined based on the pressure fluctuation condition of the main coal injection tank, and whether to start coal powder suspension strengthening is determined based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main and standby coal injection tanks.

[0088] If the main coal injection tank is of a weak replacement tendency type, the main and standby coal injection tanks are operated according to the initial fluidization parameters.

[0089] In the present application, it is considered that the strong replacement tendency type usually corresponds to the existence of pressure abnormalities or coal injection amount fluctuations in the main coal injection tank, at this time, the fluidization time length is calculated by the main tank pressure fluctuation variance (the larger the variance, the longer the fluidization time length), the fluidization effect of the main and standby tanks can be targetedly strengthened (for example, the fluidization time is prolonged when the pressure fluctuation is severe, to ensure that the coal powder is fully suspended), the unstable state of the main tank is avoided to be transmitted to the standby tank, the continuity of the coal supply parameters after switching is ensured, whether to start coal powder suspension strengthening is determined based on the time interval between the pre-start of the main and standby tanks and the pre-stop of the main tank, which not only avoids the waste of resources when the time is sufficient (for example, do not start when the interval is short, and operate according to the conventional process), but also ensures the stability of the coal powder state when the interval is long (for example, prevent coal powder deposition and arching by strengthening suspension), and balances stability and economy.

[0090] Specifically, the analysis module is used to determine the fluidization time length of the main and standby coal injection tanks based on the pressure fluctuation condition of the main coal injection tank, wherein,

[0091] The time node-pressure curve is drawn based on the historical data of the pressure fluctuation of the main coal injection tank,

[0092] The pressure change amplitude of each time node and the previous time node is determined,

[0093] solving the variance of the pressure change amplitude,

[0094] determining the fluidization duration of the main and standby coal injection tank based on the variance,

[0095] wherein the increase amount of the fluidization duration is positively correlated with the variance.

[0096] Specifically, in the embodiment, the starting fluidization time node of the main and standby coal injection tank is adjusted based on the adjusted fluidization duration, and the ending fluidization time node remains unchanged.

[0097] In the embodiment, optionally,

[0098] comparing the variance with a first preset variance and a second preset variance,

[0099] if the variance is less than or equal to the first preset variance, the fluidization duration is adjusted to 1.1 times of the initial value;

[0100] if the variance is greater than the first preset variance and less than or equal to the second preset variance, the fluidization duration is adjusted to 1.2 times of the initial value;

[0101] if the variance is greater than the second preset variance, the fluidization duration is adjusted to 1.3 times of the initial value;

[0102] wherein the first preset variance and the second preset variance are determined based on statistical analysis of historical normal operation data by the following method: collecting pressure fluctuation data of the main coal injection tank under stable fluidization conditions; calculating the variance of the pressure change amplitude of each group of data; drawing a probability distribution graph of the historical variance data; determining the mean and standard deviation; taking 1.2 times of the mean of the historical variance, covering about 80% of normal conditions, to obtain the first preset variance; taking 1.5 times of the mean of the historical variance, covering about 95% of normal conditions, to obtain the second preset variance.

[0103] Specifically, the analysis module is used to determine whether to start the pulverized coal suspension strengthening based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main and standby coal injection tank, comprising:

[0104] if the time interval is greater than or equal to a preset time interval, the pulverized coal suspension strengthening is started;

[0105] if the time interval is less than the preset time interval, the pulverized coal suspension strengthening is not started.

[0106] Specifically, in this embodiment, the preset time interval is set based on the minimum fluidization preparation time of the main and standby coal injection tank, that is, the shortest time required for the main and standby coal injection tank to reach a stable coal supply state from starting, which is affected by factors such as tank capacity, initial fluidization parameters (such as fluidization air volume, pressure), coal characteristics (particle size, humidity), etc. and needs to be determined through historical operation data statistics or experimental measurement. To deal with uncertainties in the fluidization process (such as insufficient particle movement intensity, temporary equipment fluctuations), the preset time interval needs to increase the safety redundancy time (usually 10%-30% of the minimum fluidization preparation time) based on the minimum fluidization preparation time. For example: through historical data statistics, it is determined that it needs 30 minutes (i.e. 0.5 hours) from starting to stable coal supply, and the minimum fluidization preparation time of the main and standby coal injection tank is obtained. Considering that coal humidity fluctuations may prolong the fluidization time, take 20% of the minimum fluidization preparation time as redundancy, that is, 30 minutes x 20% = 6 minutes, and the preset time interval = minimum fluidization preparation time + safety redundancy time = 30 minutes + 6 minutes = 36 minutes.

[0107] In the present application, the "dispersion degree" of the main tank pressure fluctuation is converted into a quantifiable indicator through variance calculation of the pressure change amplitude, and the larger the variance, the more unstable the pressure (such as pipeline blockage, coal arching, etc. Abnormal), at this time, extending the fluidization time of the standby tank can fully eliminate the coal agglomeration, improve the coal supply stability of the standby tank, identify potential faults of the main tank (such as variance exceeding threshold) in advance, extend the fluidization time of the standby tank "in advance", reduce the probability of coal supply abnormalities of the standby tank after switching, ensure the standby tank to meet the standard quickly in emergency through the suspension strengthening mechanism, reduce the risk of coal supply interruption caused by insufficient switching time, especially suitable for high requirements for continuity such as blast furnace coal injection.

[0108] Specifically, the emergency warning module is used to analyze whether to start the vice standby coal injection tank according to the particle movement intensity inside the main and standby coal injection tank, comprising:

[0109] If the particle movement intensity is greater than or equal to the preset particle movement intensity, the vice standby coal injection tank is started;

[0110] If the particle movement intensity is less than the preset particle movement intensity, the vice standby coal injection tank is not started.

[0111] Specifically, in this embodiment, the particle movement intensity data of the main and standby coal injection tanks under normal stable coal supply state is collected (obtained by monitoring with the acoustic sensor), the acoustic sensor converts the signal intensity (such as the amplitude and frequency distribution energy of the acoustic wave) generated by the collision and friction of the coal particles into the quantified "particle movement intensity" index by capturing the acoustic wave signals; the samples meeting the following conditions are selected from the historical data: the fluidization parameters of the main and standby coal injection tanks are normal (the fluidization air volume and pressure are within the design range); the coal injection amount is stable (the fluctuation amplitude is less than or equal to the preset coal injection amount threshold); no abnormal conditions such as pipe blockage and coal interruption occur; the particle movement intensity data after screening is statistically analyzed to calculate the mean and standard deviation; the preset particle movement intensity needs to ensure that the main and standby coal injection tanks can stably supply coal and avoid coal supply interruption caused by insufficient particle movement, and is usually set as: preset particle movement intensity = mean of particle movement intensity during normal operation - 1.5 x standard deviation, which can cover about 93% of normal working conditions.

[0112] Specifically, the early warning module further comprises:

[0113] a pressure fluctuation early warning unit for monitoring the pressure fluctuation inside the main coal injection tank;

[0114] a coal injection amount early warning unit for monitoring the coal injection amount of the main coal injection tank.

[0115] Specifically, the pressure fluctuation early warning unit is used to analyze whether the main coal injection tank has abnormal pressure fluctuation based on the pressure fluctuation amplitude inside the main coal injection tank, wherein,

[0116] if the pressure fluctuation amplitude is greater than or equal to the preset pressure fluctuation amplitude, it is determined that the main coal injection tank has abnormal pressure fluctuation;

[0117] if the pressure fluctuation amplitude is less than the preset pressure fluctuation amplitude, it is determined that the main coal injection tank has normal pressure fluctuation.

[0118] Specifically, in this embodiment, the preset pressure fluctuation amplitude is the key threshold for judging whether the main coal injection tank has abnormal pressure fluctuation, which needs to be determined based on the pressure fluctuation characteristics of the main coal injection tank in the normal operation state, combined with the requirement of the production process for the pressure stability, and obtained by historical data statistics and process demand adaptation. The historical pressure data of the main coal injection tank in the stable coal supply stage (non-starting and stopping transition period) is selected, covering different working conditions (such as different coal powder amount, fluidization parameters, and production load), to ensure the representativeness of the data, and the abnormal pressure fluctuation data caused by equipment failure, human operation error, etc. is excluded, and the pressure record in the normal operation state (such as stable coal injection amount, no pipe blockage / air leakage, etc.) is retained. For the screened pressure data, the pressure fluctuation amplitude (i.e. the difference between the maximum and minimum pressure in the time period) in a unit time (such as per minute) is calculated. The mean (μ) and standard deviation (σ) of all normal fluctuation amplitudes are calculated. The preset pressure fluctuation amplitude = μ + k × σ, wherein the coefficient k is adjusted according to the requirement of the process for stability (generally 1.2-2.0): for the scene with high requirement for stability (such as stable coal powder input for blast furnace coal injection to ensure the furnace temperature), k takes a larger value (such as 1.5-2.0); for the scene with moderate requirement for stability, k takes 1.2-1.5.

[0119] Specifically, the emergency warning module is used to close the outlet valve of the main coal injection tank to isolate the fault tank when the condition of starting the auxiliary backup coal injection tank is determined, and the auxiliary backup coal injection tank directly starts the emergency fluidization mode, and the main backup coal injection tank maintains the fluidization state.

[0120] Specifically, in this embodiment, the emergency fluidization mode is a special operation state of the auxiliary backup coal injection tank when the fluidization effect of the main backup coal injection tank does not meet the standard (the particle movement intensity is greater than or equal to a preset value), which is started for quickly replacing the coal supply task. The core goal is to reach the stable coal supply condition in the shortest time to ensure uninterrupted coal powder supply. The maximum design fluidization air volume (usually 1.2-1.5 times of the normal fluidization air volume) and the upper limit fluidization pressure are used to break the particle agglomeration by strong air flow, and to quickly break the particle agglomeration and improve the particle movement intensity. The conventional preheating, step-by-step pressure increasing process, etc. are skipped, and the high parameters are directly started to shorten the time from starting to stable coal supply (the target is 50%-70% of the time of conventional fluidization preparation).

[0121] In the present application, when the emergency fluidization mode is started, the high air volume and pressure can quickly break the coal powder agglomeration. Even if the main backup tank does not meet the standard (such as insufficient particle movement intensity), the auxiliary backup tank can still quickly reach the stable coal supply condition through the emergency mode, avoiding production accidents such as high furnace temperature fluctuation caused by coal supply interruption.

[0122] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings, but it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the present application, and the technical solutions after the changes or replacements will all fall within the protection scope of the present application.

[0123] The above only describes the preferred embodiments of the present application and is not used to limit the present application; for those skilled in the art, the present application can have various changes and variations, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-tank coordinated fluid flow dynamic regulation system, characterized in that, The application relates to a coal powder monitoring system for a coal-fired power plant, which comprises: a coal powder amount monitoring module for monitoring the residual amount of coal powder in a main coal injection tank in real time; a warning module connected with the coal powder amount monitoring module, which is used for determining the replacement tendency type of the main coal injection tank based on abnormal pressure fluctuation in the main coal injection tank and irregular change of the coal injection amount; an analysis module connected with the warning module, which is used for determining the operation parameters of a main / backup coal injection tank based on the replacement tendency type determined by the warning module, comprising: determining the fluidization time length of the main / backup coal injection tank based on the pressure fluctuation of the main coal injection tank, and determining whether to start coal powder suspension strengthening based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main / backup coal injection tank, or, operating the main / backup coal injection tank according to initial fluidization parameters; a fluidization monitoring module connected with the analysis module, which is used for monitoring the particle motion intensity in the main / backup coal injection tank; an emergency warning module connected with the fluidization monitoring module, which is used for analyzing whether to start a backup backup coal injection tank according to the particle motion intensity in the main / backup coal injection tank.

2. The multi-tank coordinated fluid flow dynamic regulation system of claim 1, wherein, The warning module is used for determining the replacement tendency type of the main coal injection tank based on abnormal pressure fluctuation in the main coal injection tank and irregular change of the coal injection amount, wherein, if there is abnormal pressure fluctuation in the main coal injection tank and / or the coal injection amount has irregular change, the main coal injection tank is determined as a strong replacement tendency type; if there is no abnormal pressure fluctuation in the main coal injection tank and / or the coal injection amount has no irregular change, the main coal injection tank is determined as a weak replacement tendency type.

3. The multi-tank coordinated fluid flow dynamic regulation system of claim 2, wherein, The analysis module is used for determining the operation parameters of the main / backup coal injection tank based on the replacement tendency type determined by the warning module, comprising: if the main coal injection tank is a strong replacement tendency type, the fluidization time length of the main / backup coal injection tank is determined based on the pressure fluctuation of the main coal injection tank, and whether to start coal powder suspension strengthening is determined based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main / backup coal injection tank, if the main coal injection tank is a weak replacement tendency type, the main / backup coal injection tank is operated according to initial fluidization parameters.

4. The multi-tank coordinated fluid flow dynamic regulation system of claim 3, wherein, The analysis module is used for determining the fluidization time length of the main / backup coal injection tank based on the pressure fluctuation of the main coal injection tank, wherein, a time node-pressure curve is drawn based on the historical data of the pressure fluctuation of the main coal injection tank, the pressure change amplitude of each time node and the previous time node is determined, the variance of the pressure change amplitude is solved, the fluidization time length of the main / backup coal injection tank is determined based on the variance, wherein the increase amount of the fluidization time length is positively correlated with the variance.

5. The multi-tank coordinated fluid flow dynamic regulation system of claim 3, wherein, The analysis module is used for determining whether to start coal powder suspension strengthening based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main / backup coal injection tank, comprising: if the time interval is greater than or equal to a preset time interval, coal powder suspension strengthening is started; if the time interval is less than the preset time interval, coal powder suspension strengthening is not started.

6. The multi-tank coordinated fluid flow dynamic regulation system of claim 1, wherein, The emergency warning module is used for analyzing whether to start a backup backup coal injection tank according to the particle motion intensity in the main / backup coal injection tank, comprising: if the particle motion intensity is greater than or equal to a preset particle motion intensity, the backup backup coal injection tank is started; If the particle movement intensity is less than the preset particle movement intensity, the secondary backup coal injection tank is not started.

7. The multi-tank coordinated fluid flow dynamic regulation system of claim 5, wherein, The early warning module further comprises: a pressure fluctuation early warning unit configured to monitor pressure fluctuation inside the main coal injection tank; a coal injection amount early warning unit configured to monitor coal injection amount of the main coal injection tank.

8. The multi-tank coordinated fluid flow dynamic regulation system of claim 7, wherein, The pressure fluctuation early warning unit is configured to analyze whether the main coal injection tank has abnormal pressure fluctuation based on a pressure fluctuation amplitude inside the main coal injection tank, wherein if the pressure fluctuation amplitude is greater than or equal to a preset pressure fluctuation amplitude, it is determined that the main coal injection tank has abnormal pressure fluctuation; if the pressure fluctuation amplitude is less than the preset pressure fluctuation amplitude, it is determined that the main coal injection tank has normal pressure fluctuation.

9. The multi-tank coordinated fluid flow dynamic regulation system of claim 6, wherein, The emergency early warning module is configured to, under the condition of determining to start the secondary backup coal injection tank, close the outlet valve of the main coal injection tank to isolate the fault tank, directly start the emergency fluidization mode for the secondary backup coal injection tank, and maintain the fluidization state for the main backup coal injection tank.

10. A multi-tank coordinated fluid flow dynamic regulation method using the system of any one of claims 1-9, wherein S1, real-time monitoring of the residual amount of coal powder inside the main coal injection tank, when the residual amount of coal powder is less than a preset residual amount of coal powder, monitoring the pressure fluctuation inside the main coal injection tank and the change of the coal injection amount; S2, determining the replacement tendency type of the main coal injection tank based on the abnormal pressure fluctuation inside the main coal injection tank and the irregular change of the coal injection amount, and determining the operation parameters of the main backup coal injection tank based on the replacement tendency type of the main coal injection tank, including: determining the fluidization time of the main backup coal injection tank based on the pressure fluctuation of the main coal injection tank, and determining whether to start coal powder suspension intensification based on the time interval between the pre-stop time node of the main coal injection tank and the pre-start time node of the main backup coal injection tank, or, operating the main backup coal injection tank according to the initial fluidization parameters; S3, monitoring the particle movement intensity inside the main backup coal injection tank during the fluidization process by using a sound wave sensor, and analyzing whether to start the secondary backup coal injection tank according to the particle movement intensity; S4, completing the fluid flow dynamic regulation for the coal injection tank.

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