CN114082325A - Limestone slurry preparation system and control method - Google Patents
Limestone slurry preparation system and control method Download PDFInfo
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- CN114082325A CN114082325A CN202111304747.2A CN202111304747A CN114082325A CN 114082325 A CN114082325 A CN 114082325A CN 202111304747 A CN202111304747 A CN 202111304747A CN 114082325 A CN114082325 A CN 114082325A
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Abstract
The invention discloses a limestone slurry preparation system and a control method, wherein the limestone slurry preparation system comprises a limestone slurry tank, a water feed pump, a limestone powder bin, a feeder and a controller, the controller is used for starting the water feed pump and the feeder when a system starting instruction is detected, enabling the system to execute a preset operation mode, determining current set output, current set opening and current set feeding time for enabling the slurry density to be qualified and to be stable according to the difference value of the current density and expected density of slurry in the limestone slurry tank, and finally ensuring the maximum output of the feeder through continuous iteration, so that the slurry preparation is ensured to be completed in the shortest time, the power consumption is reduced by a full feeder, the density stability of the slurry in the slurry preparation process is improved, and the slurry quality is improved.
Description
Technical Field
The application relates to the technical field of desulfurization process control, in particular to a limestone slurry preparation system and a control method.
Background
With the rapid development of the thermal power industry and the gradually healthy and complete regulation of the environmental protection system in China, the investment of flue gas desulfurization process equipment and the stable operation thereof become very much concerned problems for thermal power enterprises. In the wet desulfurization process of a thermal power plant, limestone slurry is a main raw material of flue gas desulfurization chemical reaction, wherein factors such as the concentration of the limestone slurry, the pulping rate and the like influence the efficiency and the safe operation of the desulfurization process.
At present, a thermal power plant desulfurization limestone slurry preparation system adopts a limestone powder and water mixing mode to prepare limestone slurry, and the following problems exist:
1. when limestone slurry is prepared, the control water inlet adjusting door is controlled according to the deviation of the slurry liquid level and the set liquid level, no adjusting allowance is left when the liquid level is about to reach a critical value or exceeds the critical value, and if the slurry density near the density critical value exceeds the standard density, the slurry density is too high.
2. When limestone slurry is prepared, the frequency of the feeder is automatically adjusted by tracking the density of the slurry, and because the uniform mixing process of limestone powder and water is long, the slurry density feedback has hysteresis, and the tracking adjustment easily causes overlarge fluctuation of the actual slurry density and influences the desulfurization efficiency.
3. When limestone slurry is prepared, the frequency of the feeder is adjusted in real time through the slurry density, the maximum output of the feeder cannot be maintained in the process, the slurry preparation time is prolonged, and the power consumption is increased.
Therefore, how to provide a limestone slurry preparation system capable of improving the density stability of slurry in the slurry preparation process so as to improve the slurry quality is a technical problem to be solved at present.
Disclosure of Invention
The embodiment of the invention provides a limestone slurry preparation system, which is used for solving the technical problem of poor density stability of slurry in the slurry preparation process in the prior art. The system comprises:
the limestone slurry tank is connected with a density meter and a liquid level meter;
the water feeding pump is connected with the limestone slurry tank through a water feeding pipeline provided with a water feeding adjusting door and is used for supplying water to the limestone slurry tank;
the limestone powder bin is used for storing limestone powder;
the feeding machine is arranged on a feeding pipeline between the limestone powder bin and the limestone slurry tank and is used for feeding the limestone powder in the limestone powder bin into the limestone slurry tank;
a controller to:
when a system starting instruction is detected, the feed pump and the feeder are started, and the system is enabled to execute a preset operation mode, wherein the preset operation mode comprises the following steps: controlling the water supply regulating door based on the current set opening degree, controlling the feeding machine based on the current set output force, closing the water supply regulating door and setting the output force of the feeding machine to zero when the current set feeding time is reached, and recording the difference value between the current density and the expected density of the slurry in the limestone slurry tank;
if the absolute value of the difference is larger than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, taking a first preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the first preset output, the current set opening and the current set feeding time;
if the absolute value is larger than the density allowable error, the difference value is smaller than zero, and the current set output is equal to the preset maximum output, taking a first preset opening as a new current set opening, and enabling the system to execute the preset operation mode again based on the current set output, the first preset opening and the current set feeding time;
if the absolute value is larger than the density allowable error and the difference value is larger than zero, taking a second preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the second preset output, the current set opening and the current set feeding time;
if the absolute value is smaller than the density allowable error, performing preset slurry discharging operation for discharging the slurry from the limestone slurry tank, and enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time;
the first preset output is greater than the current set output, the first preset opening is smaller than the current set opening, the second preset output is smaller than the current set output, the current set output is a preset initial output when the system operates for the first time, the current set opening is a preset initial opening when the system operates for the first time, and the current set feeding time is a preset initial feeding time when the system operates for the first time.
Correspondingly, the invention also provides a control method of the limestone slurry preparation system, and the system comprises the following steps:
the limestone slurry tank is connected with a density meter and a liquid level meter;
the water feeding pump is connected with the limestone slurry tank through a water feeding pipeline provided with a water feeding adjusting door and is used for supplying water to the limestone slurry tank;
the limestone powder bin is used for storing limestone powder;
the feeding machine is arranged on a feeding pipeline between the limestone powder bin and the limestone slurry tank and is used for feeding the limestone powder in the limestone powder bin into the limestone slurry tank;
a controller;
the method is applied to the controller and comprises the following steps:
when a system starting instruction is detected, the feed pump and the feeder are started, and the system is enabled to execute a preset operation mode, wherein the preset operation mode comprises the following steps: controlling the water supply regulating door based on the current set opening degree, controlling the feeding machine based on the current set output force, closing the water supply regulating door and setting the output force of the feeding machine to zero when the current set feeding time is reached, and recording the difference value between the current density and the expected density of the slurry in the limestone slurry tank;
if the absolute value of the difference is larger than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, taking a first preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the first preset output, the current set opening and the current set feeding time;
if the absolute value is larger than the density allowable error, the difference value is smaller than zero, and the current set output is equal to the preset maximum output, taking a first preset opening as a new current set opening, and enabling the system to execute the preset operation mode again based on the current set output, the first preset opening and the current set feeding time;
if the absolute value is larger than the density allowable error and the difference value is larger than zero, taking a second preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the second preset output, the current set opening and the current set feeding time;
if the absolute value is smaller than the density allowable error, performing preset slurry discharging operation for discharging the slurry from the limestone slurry tank, and enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time;
the first preset output is greater than the current set output, the first preset opening is smaller than the current set opening, the second preset output is smaller than the current set output, the current set output is a preset initial output when the system operates for the first time, the current set opening is a preset initial opening when the system operates for the first time, and the current set feeding time is a preset initial feeding time when the system operates for the first time.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a limestone slurry preparation system and a control method, wherein the limestone slurry preparation system comprises a limestone slurry tank, a water feed pump, a limestone powder bin, a feeder and a controller, the controller is used for starting the water feed pump and the feeder when a system starting instruction is detected, enabling the system to execute a preset operation mode, determining current set output, current set opening and current set feeding time for enabling the slurry density to be qualified and to be stable according to the difference value of the current density and expected density of slurry in the limestone slurry tank, and finally ensuring the maximum output of the feeder through continuous iteration, so that the slurry preparation is ensured to be completed in the shortest time, the power consumption is reduced by a full feeder, the density stability of the slurry in the slurry preparation process is improved, and the slurry quality is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram showing a limestone slurry preparation system according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating the operation of a controller in a limestone slurry preparation system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating the operation of a controller in a limestone slurry preparation system according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating the operation of a controller in a limestone slurry preparation system according to yet another embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating the operation of a controller in a limestone slurry preparation system according to yet another embodiment of the present invention;
FIG. 6 is a flow chart illustrating a method for controlling a limestone slurry preparation system according to an embodiment of the present invention;
in fig. 1: 1. the system comprises a water supply pump, a water supply shutoff valve, a water supply adjusting valve, a limestone powder bin, a feeder, a limestone slurry tank, a liquid level meter, a density meter, a stirrer, a hot air pipeline, a hot air fan, a hot air inlet valve, a water supply pump, a water supply shutoff valve, a water supply adjusting valve, a limestone powder bin, a feeder, a limestone slurry tank, a liquid level meter, a density meter, a stirrer, a hot air pipeline, a hot air fan, a hot air inlet valve and a water supply adjusting valve.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
An embodiment of the present invention provides a limestone slurry preparation system, as shown in fig. 1, including:
the limestone slurry tank 6 is connected with a densimeter 8 and a liquid level meter 7;
the water feeding pump 1 is connected with the limestone slurry tank 6 through a water feeding pipeline provided with a water feeding adjusting door 3 and is used for supplying water to the limestone slurry tank 6;
a limestone powder bin 4 for storing limestone powder;
the feeding machine 5 is arranged on a feeding pipeline between the limestone powder bin 4 and the limestone slurry tank 6 and is used for feeding limestone powder in the limestone powder bin 4 into the limestone slurry tank 6;
and a controller (not shown in the figure) which controls at least the feeding machine 5, the water feeding pump 1 and the water feeding adjusting door 3 and receives the density signal sent by the density meter 8 and the liquid level signal sent by the liquid level meter 7.
The controller, as shown in fig. 2, is configured to perform the following steps:
and step S101, when a system starting instruction is detected, starting the water feeding pump and the feeder.
The system start-up command may be initiated by a human operator or triggered according to preset start-up logic.
Step S102, the system is enabled to execute a preset operation mode.
Specifically, the preset operation mode includes: controlling the water supply regulating door based on the current set opening degree, controlling the feeding machine based on the current set output force, closing the water supply regulating door and setting the output force of the feeding machine to zero when the current set feeding time is reached, and recording the difference value between the current density and the expected density of the slurry in the limestone slurry tank.
Step S103, determining whether the absolute value of the difference between the current density and the expected density is greater than the density tolerance, if so, performing step S104, otherwise, performing step S109.
Step S104, determining whether the difference is greater than zero, if yes, performing step S108, otherwise, performing step S105.
Step S105, determining whether the currently set output is equal to the preset maximum output, if so, executing step S107, otherwise, executing step S106.
Optionally, the predetermined maximum output may be 100%.
Step S106, taking the first preset output as a new current set output, and re-executing the step S102.
In this step, since the absolute value of the difference is greater than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, which indicates that the density of the slurry is unqualified and too low, and the proportion of the limestone powder needs to be increased to increase the density, when the current set output of the feeder is smaller than the preset maximum output, the first preset output greater than the current set output is used as a new current set output.
It should be noted that the first preset output is not a fixed output, a first preset corresponding relationship exists between the first preset output and the current set output, and when the current set output changes, the first preset output also changes.
In order to accurately improve the output of the feeding machine, in some embodiments of the present application, if the absolute value of the difference is greater than the density tolerance, the difference is smaller than zero, and the currently set output is smaller than the preset maximum output, Y isn+1＝Yn-(Δρn*10/ρExpectation of)*100％。Yn+1For a new current set force, YnFor said currently set output, Δ ρnIs the difference, pExpectation ofFor the desired density, n is the number of times the system executes the preset operating mode.
In this example, Y at this timen+1I.e. said first predetermined output.
It should be noted that the scheme of the above embodiment is only a specific implementation scheme proposed by the present application, and other ways of determining the new current set output based on the first preset output all belong to the protection scope of the present application.
And step S107, taking the first preset opening as a new current set opening, and executing step S102 again.
In this step, since the absolute value is greater than the density tolerance, the difference is less than zero, and the currently set output is equal to the preset maximum output, which indicates that the density of the slurry is unqualified and too low, the proportion of the limestone powder needs to be increased to increase the density, but the currently set output of the feeder reaches the preset maximum output, the feed water amount is reduced by reducing the opening of the feed water adjusting door, so that the density is increased, that is, the first preset opening smaller than the currently set opening is used as a new currently set opening.
It should be noted that the first preset opening degree is not a fixed opening degree, a second preset corresponding relationship exists between the first preset opening degree and the current set opening degree, and when the current set opening degree changes, the first preset opening degree also changes.
In order to accurately reduce the opening degree of the feed water regulating valve, in some embodiments of the present application, the absolute value is greater than the density allowable error, the difference is less than zero, and the currently set output is equal to the preset maximum output, Xn+1＝Xn+(Δρn*10/ρExpectation of)*100％，Xn+1For a new currently set opening, XnFor the currently set opening, Δ ρnIs the difference, pExpectation ofFor the desired density, n is the number of times the system executes the preset operating mode.
In the present example, X at this timen+1I.e. the first preset opening degree.
It should be noted that the above embodiment is only one specific implementation solution proposed in the present application, and other ways of determining the new current set opening based on the first preset opening all belong to the protection scope of the present application.
Step S108, taking the second preset output as a new current set output, and re-executing the step S102.
In this step, since the absolute value is greater than the density allowable error and the difference is greater than zero, which indicates that the density of the slurry is unqualified and too high, the density of the slurry needs to be reduced by reducing the proportion of the limestone powder, and therefore the second preset output smaller than the current set output is used as the new current set output.
It should be noted that the second preset output is not a fixed output, a third preset corresponding relationship exists between the second preset output and the current set output, and when the current set output changes, the second preset output also changes.
In order to accurately reduce the output of the feeding machine, in some embodiments of the present application, if the absolute value is greater than the density tolerance and the difference is greater than zero, Y isn+1＝Yn-(Δρn*10/ρExpectation of)*100％。
In this example, Y at this timen+1I.e. the second predetermined output.
It should be noted that the scheme of the above embodiment is only a specific implementation scheme proposed by the present application, and other ways of determining the new current set output based on the second preset output all belong to the protection scope of the present application.
Step S109, a preset discharging operation of discharging the slurry from the limestone slurry tank is performed.
In this step, since the absolute value is smaller than the density allowable error, it is indicated that the density of the slurry is qualified at this time, the slurry discharge may be performed, and a preset slurry discharge operation is performed, and the specific process of the slurry discharge operation is obvious to those skilled in the art and will not be described herein again.
And step S110, enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time.
In the step, because the slurry density is qualified, the controller enables the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time, so that the slurry preparation is continuously carried out on the basis of ensuring the qualified and stable slurry density.
In addition, when the system operates for the first time, the currently set output is the preset initial output, the currently set opening is the preset initial opening, the currently set feeding time is the preset initial feeding time, and the currently set output, the currently set opening and the currently set feeding time for stabilizing the slurry density are determined by adjusting the difference value between the current density and the expected density of the slurry after the preset operation mode is executed each time.
Through applying above technical scheme, in the limestone slurry preparation system that includes limestone slurry case, feed pump, limestone powder storehouse, batcher and controller, this controller is used for when detecting system start-up instruction, start feed pump with the batcher, and make the system carry out and predetermine the operational mode, predetermine the operational mode and include: the method comprises the steps of controlling the water supply adjusting door based on a current set opening degree, controlling the feeding machine based on a current set output force, closing the water supply adjusting door and setting the output force of the feeding machine to zero when the current set feeding time is reached, recording the difference value between the current density and an expected density of slurry in the limestone slurry tank, determining the current set output force, the current set opening degree and the current set feeding time for enabling the slurry density to be qualified and to be stable according to the difference value, finally ensuring the maximum output force of the feeding machine through continuous iteration, ensuring that the slurry preparation is completed in the shortest time, fully reducing power consumption of the feeding machine, improving the density stability of the slurry in the slurry preparation process, and improving the slurry quality.
To further improve the density stability of the slurry during slurry preparation, in some embodiments of the present application, as shown in fig. 3, the controller is further configured to perform the following steps:
step S201, performing preset slurry discharging operation and enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time.
Step S202, determining whether the absolute value of the difference between the current density and the expected density is greater than the density tolerance, if so, performing step S203, otherwise, performing step S201.
Step S203, determining that the number of times that the absolute value is continuously greater than the density allowable error reaches a preset number, if yes, performing step S204, otherwise, performing step S201.
In a specific application scenario of the present application, the preset number of times is two.
And step S204, stopping the preset slurry discharging operation, and enabling the system to execute the preset operation mode again based on the current set output, the current set opening and the current set feeding time.
In this step, since the number of times that the absolute value of the difference between the current density and the expected density is continuously greater than the density tolerance reaches the preset number of times, which indicates that the density at this time is not acceptable, adjustment needs to be performed again, the system is caused to execute the preset operation mode again based on the current set output, the current set opening and the current set feeding time, and then the above steps S103 to S110 are continuously performed to adjust the qualified and stable slurry density.
To improve slurry preparation efficiency, in some embodiments of the present application, the controller is further configured to:
before the system is caused to execute the preset running mode for the first time, the system is caused to execute a preset debugging mode, wherein the preset debugging mode comprises the following steps: controlling the water supply adjusting door based on the current debugging opening degree, controlling the feeding machine based on the current debugging output, closing the water supply adjusting door and setting the output of the feeding machine to zero when the preset feeding time is reached, and recording a first density difference value between the current debugging density and the expected density of the slurry in the limestone slurry tank;
and determining the preset initial output and the preset initial opening degree based on the first density difference value.
In this embodiment, before the system executes the preset operation mode for the first time, the system executes the preset debugging mode to debug a suitable preset initial output and a suitable preset initial opening degree, so that an error of manually setting the current set output and the current set opening degree is reduced, the system executes the preset operation mode based on the suitable preset initial output and the suitable preset initial opening degree, the set output and the set opening degree for enabling the slurry density to be qualified are quickly determined, and the slurry preparation efficiency is improved.
In order to determine the accurate preset initial output and the preset initial opening, in some embodiments of the present application, before the system is caused to perform the preset operation mode for the first time, as shown in fig. 4, the controller is further configured to perform the following steps:
step S301, the system executes a preset debug mode.
In step S302, it is determined whether the first density difference is greater than zero, if yes, step S303 is performed, otherwise, step S305 is performed.
Step S303, based on the third preset output as a new current debugging output, again executing the preset debugging mode and determining the second density difference.
In this step, the third preset output is smaller than the current debugging output, since the first density difference is larger than zero, it is indicated that the density of the current slurry is too high, the output of the feeder needs to be reduced, the system is made to execute the preset debugging mode again based on the third preset output, the current debugging opening and the preset feeding time, and a second density difference between the new debugging density and the current debugging density is determined.
Step S304, determining a preset initial output according to the second density difference.
In step S305, it is determined whether the first density difference is less than zero, and if yes, step S306 is executed.
And step S306, based on the second preset opening degree as a new current debugging opening degree, executing the preset debugging mode again and determining the second density difference value.
In this step, the second preset opening is smaller than the current debugging opening, since the first density difference is smaller than zero, it indicates that the density is too small at this time, the water supply amount needs to be reduced, the system executes the preset debugging mode again based on the current debugging output, the second preset opening and the preset feeding time, and determines the second density difference.
It should be noted that the second preset opening degree is not a fixed opening degree, a fourth preset corresponding relationship exists between the second preset opening degree and the current set opening degree, and when the current set opening degree changes, the second preset opening degree also changes.
And step S307, determining a preset initial opening according to the second density difference.
In this embodiment, the initial debugging output of the system when the system executes the preset debugging mode for the first time is the preset maximum output, and the initial debugging opening of the system when the system executes the preset debugging mode for the first time is the preset maximum opening of the water supply regulating valve, optionally, the preset maximum output is 100%, and the preset maximum opening is 100%. In addition, since the preset debug mode is just started to be executed, the probability that the first density difference is zero is very small because several times of adjustment are required, and this embodiment is not considered for a while.
In order to accurately determine the preset initial output and the preset initial opening, in some embodiments of the present application, as shown in fig. 5, the controller is further specifically configured to perform the following steps:
step S401, determine whether the first density difference is greater than zero and the second density difference is greater than zero, if yes, execute step S402, otherwise execute step S403.
Step S402, the system repeatedly executes the preset debugging mode based on the third preset output, the current debugging opening and the preset feeding time until the second density difference value is smaller than zero.
Specifically, since the first density difference is greater than zero and the second density difference is greater than zero, which indicates that the density of the slurry continues to increase under the condition of higher density of the slurry, the output of the feeder needs to be further reduced, and the system is caused to repeatedly execute the preset debugging mode based on the third preset output, the current debugging opening and the preset feeding time until the second density difference is less than zero.
It should be noted that the third preset output is not a fixed output, a fifth preset corresponding relationship exists between the third preset output and the current debugging output, when the current debugging output changes, the third preset output also changes, and the current debugging output is gradually reduced by repeatedly executing the preset debugging mode.
In step S403, it is determined whether the first density difference is greater than zero and the second density difference is less than zero, if yes, step S404 is performed, otherwise, step S406 is performed.
Step S404, based on the fourth preset output, the current debugging opening, and the preset feeding time, repeatedly executing the preset debugging mode by the system until the first density difference is equal to zero or the execution times of the preset debugging mode reach preset execution times.
In this embodiment, the fourth preset output is greater than the current debugging output, and since the first density difference is greater than zero and the second density difference is less than zero at this time, it indicates that the slurry density is decreasing, and in order to reduce the rate of decreasing the slurry density and prevent the density from being too low after overshoot, the preset debugging mode is repeatedly executed by the system based on the fourth preset output, the current debugging opening, and the preset feeding time until the first density difference is equal to zero.
It should be noted that the fourth preset output is not a fixed output, a sixth preset corresponding relationship exists between the fourth preset output and the current debugging output, when the current debugging output changes, the fourth preset output also changes, and the current debugging output is gradually increased by repeatedly executing the preset debugging mode.
Step S405, determining the preset initial output according to the debugging output when the first density difference is equal to zero or the execution times reaches the preset execution times.
Step S406, determining whether the first density difference is smaller than zero and the second density difference is smaller than zero, if yes, performing step S407, otherwise, performing step S408.
Step S407, repeatedly executing the preset debugging mode by the system based on the current debugging output, the second preset opening, and the preset feeding time until the second density difference is greater than zero.
In this step, since the first density difference is smaller than zero and the second density difference is smaller than zero, it is indicated that the slurry density continues to decrease under the condition of low slurry density, and in order to avoid the slurry density continuing to decrease, the water feed amount needs to be decreased, the system is caused to repeatedly execute the preset debugging mode based on the current debugging output, the second preset opening degree and the preset feeding time until the second density difference is larger than zero.
In step S408, it is determined whether the first density difference is smaller than zero and the second density difference is larger than zero, if yes, step S409 is executed.
Step S409, the system is enabled to repeatedly execute the preset debugging mode based on the current debugging output, the third preset opening and the preset feeding time until the first density difference value is equal to zero or the execution times reach the preset execution times.
In this step, the third preset opening is larger than the current debugging opening, since the first density difference is smaller than zero and the second density difference is larger than zero, it indicates that the slurry density is increasing, and in order to reduce the rate of increasing the slurry density and prevent the density from being too high after over-regulation, the system repeatedly executes the preset debugging mode based on the current debugging output, the third preset opening and the preset feeding time until the first density difference is equal to zero.
It should be noted that the third preset opening is not a fixed opening, a seventh preset corresponding relationship exists between the third preset opening and the current debugging opening, when the current debugging opening changes, the third preset opening also changes, and the current debugging opening is gradually increased by repeatedly executing the preset debugging mode.
Step S410, determining the preset initial opening according to the debugging opening when the first density difference is equal to zero or the execution times reaches the preset execution times.
It should be noted that the order of step S401, step S403, step S406, and step S408 may be changed, which does not affect the scope of the present application.
In order to accurately determine the preset initial output, the preset initial opening and the preset initial feeding time, in a preferred embodiment of the present application, the controller is further specifically configured to:
if it is the firstA density difference greater than zero, ym＝ym-1/2, y in this casemAnd the third preset output is obtained.
If the first density difference is greater than zero and the second density difference is less than zero, ym＝ym-1+d*k，d＝-(ym-1*ΔEm)/(ym*Δρm)，k＝(|ΔEm-1+Δρm-1|)/(ΔEm-1-Δρm-1) At this time, ymAnd the fourth preset output is obtained.
If the first density difference is less than zero, xm＝xm-1/2, x in this casemSetting the second preset opening degree;
if the first density difference is less than zero and the second density difference is greater than zero, xm＝xm-1+c*k，c＝-(xm-1*ΔEm)/(xm*Δρm) At this time, xmSetting the third preset opening degree;
wherein, ymForce, y, for a new current debugm-1M is the number of times the system executes the preset debugging mode, Delta E, for the current debugging outputmFor a new first density difference, Δ Em-1For the current first density difference, Δ ρmFor new second density difference, Δ ρm-1Is the current second density difference, xmFor a new current debug opening, xm-1Setting the current debugging opening degree;
wherein the preset initial feeding time is S1, S1 ═ LExpectation of-Lm)/(L1-L0)*S，LmIs the liquid level, L, of the limestone slurry tank when the first density difference value is equal to zeroExpectation ofFor a preset desired level, L, of the limestone slurry tank1For the limestone slurry tank to be at the liquid level, L, after the system first executes the preset debugging mode0And S is the preset feeding time, wherein the limestone slurry tank is at the liquid level before the system executes the preset debugging mode for the first time.
In the preferred embodiment of the present application, c and d have values in the range of 0-50%.
In order to improve the slurry preparation efficiency and improve the equipment reliability, in the preferred embodiment of the present application, as shown in fig. 1, a stirrer 9 is arranged in the limestone slurry tank 6, the inlet of the feeding machine 5 is connected with a hot air pipeline 10, and the hot air pipeline 10 is connected with a hot air blower 11.
In this embodiment, the hot air blower 11 provides hot air for the feeding machine 5 through the hot air duct 10, and blows off the remaining limestone powder in the feeding machine 5 to prevent hardening.
In a specific application scenario of the present application, after the feeding is finished, that is, after the output of the feeder is set to zero, the hot air blower is started for 100 s.
In some embodiments of the present application, an inlet valve 12 is disposed on the feeding pipeline, a hot air pipe 10 is disposed between the inlet valve 12 and the limestone powder bin 4, and a water supply shutoff valve 2 for controlling the opening and closing of the water supply pipeline is disposed on the water supply pipeline.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
The embodiment of the invention provides a control method of a limestone slurry preparation system, which comprises the following specific processes:
1. initial value X1, Y1, S1 calculation method:
the first step is as follows: set water supply regulating valve opening x0100% of the output force y of the feeder0The method comprises the steps of starting system operation with the feeding time s of 60s and 100%, setting the opening of an adjusting valve to be 0% and the output of a feeder to be 0% after the feeding time is reached, and simultaneously recording the current liquid level L1With the original liquid level L0Difference Δ L of1＝L1-L0Recording the current density ρ1With initial density p0Difference value Δ E of1＝ρ1-ρ0。
The second step is that: if Δ E1>0, then setting the opening x of the regulating valve2＝x1Force y of feeder2＝y1And 2, starting system operation when the feeding time s is 60s, setting the opening of the regulating valve to be 0% and the output of the feeder to be 0% after the feeding time is reached, and recording the current densityρ2And pre-start density ρ1Difference Δ ρ of2＝ρ2-ρ1. If Δ ρ2<0 then sets y3＝y2+((|ΔE2+Δρ2|)/(ΔE2-Δρ2) 50% of total reflection, if Δ ρ2>0 then repeat the second step and run to Δ ρm<0, reset ym＝ym-1+((|ΔEm-1+Δρm-1|)/(ΔEm-1-Δρm-1))*50％。
If Δ E1<0, then setting the opening x of the regulating valve2＝x1/2, the output y of the feeder2＝y1And (5) starting system operation when the feeding time s is 60s, setting the opening of the regulating valve to be 0% and the output of the feeder to be 0% after the feeding time is reached, and recording the current density rho2And pre-start density ρ1Difference Δ ρ of2＝ρ2-ρ1If Δ ρ2>0 then sets x3＝x2+((|ΔE2+Δρ2|)/(ΔE2-Δρ2) 50% of total reflection, if Δ ρ2<0 then repeat the second step and run to Δ ρm>0, reset xm＝xm-1+((|ΔEm-1+Δρm-1|)/(ΔEm-1-Δρm-1))*50％。
The third step: after the second step is completed, the opening of the regulating valve X1 is set to be XmThe output Y1 of feeder is YmAccording to the desired level LExpectation ofWith the current liquid level LmDifference Δ L ofm＝LExpectation of-LmDetermining the feeding time S ═ Delta Lm/ΔL1*60s。
Wherein m represents the current system operation times, m is 1,2,3 … … m, and m is an integer. The feed time S is the limit time at which the feed rate is maximum.
Based on the above technical solution, in the setting of the initial values X1 and Y1, the initial density is equal to the desired density for the running system, the above method for determining the initial values can reduce human errors, and the determination of the whole parameters is completed by a computer. Besides the method for determining the initial value, the initial value can also be determined manually, and the subsequent operation of the system is not influenced.
2. Intelligent control method
The first step is as follows: judging whether the system is operated for the first time, if so, directly jumping to the second step, and if not, judging the current density rho and the expected density rhoExpectation ofWhether the difference value Δ ρ of (a) is smaller than the density allowable error ρError of the measurementThe density tolerance is manually set, and if Δ ρ is smaller than the density tolerance ρError of the measurementThen, the operation is started by using the parameters X2, Y2 and S2, the second step and the third step are skipped, and if the delta rho is more than the allowable density error rho for two timesError of the measurementThen, X1 ═ X2, Y1 ═ Y2, and S1 ═ S2 are set to start the second step operation.
The second step is that: setting the opening X1 of the adjusting door, the output Y1 of the feeder and the feeding time S1, starting the system operation, setting the opening of the adjusting door to be 0% and the output of the feeder to be 0% after the feeding time is reached, and recording the current density rho and the expected density rhoExpectation ofDifference of (Δ ρ) is ρ - ρExpectation of。
If Δ ρ<0 and Y1 is less than 100%, the output of the feeder is increased, and the rerun Y2 is Y1- (delta rho 10/rho)Expectation of) 100%. If Δ ρ<0 and Y1 equals 100%, the adjustment door opening X1 is decreased and the substituted value for the run again is: x2 ═ X1+ (Δ ρ × 10/ρ)Expectation of) 100%, jump to the third step.
If Δ ρ>0 then, then reduce batcher output, substitution value of Y1 is when calculating again: y2 ═ Y1- (Δ ρ 10/ρ)Expectation of)*100％。
The third step: and finishing the sequential control, and recording the current density rho and the expected density rhoExpectation ofThe current adjusting door opening X2 is X1, the feeder output Y2 is Y1, and the feeding time S2 is S1.
Further, after feeding is finished, namely the output of the feeding machine is set to be 0, the hot air blower is started for 100s, and residual limestone powder in the feeding machine is blown out to prevent hardening.
Further, the slurry in the limestone slurry tank can be discharged after the density of the slurry reaches the expected density, namely the error is less than the allowable error rhoError of the measurementAnd (6) discharging the pulp.
In the aspect of water supply regulation, the technical scheme of the invention carries out big data operation through the deviation between the final density expected value and the actual density for many times, accurately corrects the opening of the water inlet regulation valve, ensures that the slurry reaches the standard density before the liquid level reaches the critical value, and effectively prevents the slurry from being too high in density.
According to the technical scheme, the feeder frequency is reversely corrected through the deviation of the final density expected value, the slurry density is predicted through calculation, the feedback hysteresis of the densimeter is counteracted, the density in the limestone slurry tank is ensured to be stable, and the desulfurization efficiency is ensured.
According to the technical scheme, the maximum output of the feeding machine is finally ensured through continuous iteration, the preparation of the slurry is ensured to be completed in the shortest time, and the power consumption is reduced by fully feeding the machine.
Corresponding to the limestone slurry preparation system in the embodiment of the present application, the embodiment of the present application further provides a control method of a limestone slurry preparation system, which is applied to the controller in the limestone slurry preparation system, as shown in fig. 6, and includes the following steps:
and S501, when a system starting instruction is detected, starting the water feeding pump and the feeder, and enabling the system to execute a preset operation mode.
The preset operation mode comprises the following steps: controlling the water supply regulating door based on the current set opening degree, controlling the feeding machine based on the current set output force, closing the water supply regulating door and setting the output force of the feeding machine to zero when the current set feeding time is reached, and recording the difference value between the current density and the expected density of the slurry in the limestone slurry tank.
Step S502, if the absolute value of the difference is larger than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, taking a first preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the first preset output, the current set opening and the current set feeding time.
Step S503, if the absolute value is greater than the density allowable error, the difference is smaller than zero, and the current set output is equal to the preset maximum output, taking a first preset opening as a new current set opening, and enabling the system to execute the preset operation mode again based on the current set output, the first preset opening and the current set feeding time.
Step S504, if the absolute value is larger than the density allowable error and the difference value is larger than zero, taking a second preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the second preset output, the current set opening and the current set feeding time.
And step S505, if the absolute value is smaller than the density allowable error, performing a preset slurry discharging operation of discharging the slurry from the limestone slurry tank, and enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time.
The first preset output is greater than the current set output, the first preset opening is smaller than the current set opening, the second preset output is smaller than the current set output, the current set output is a preset initial output when the system operates for the first time, the current set opening is a preset initial opening when the system operates for the first time, and the current set feeding time is a preset initial feeding time when the system operates for the first time.
To improve density stability, in some embodiments of the present application, after causing the system to repeatedly perform the preset operating mode based on the current set output, the current set opening, and the current set dosing time, the method further comprises:
and if the number of times that the absolute value is continuously larger than the density allowable error reaches a preset number of times, stopping the preset slurry discharging operation, and enabling the system to execute the preset operation mode again based on the currently set output, the currently set opening and the currently set feeding time.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A limestone slurry preparation system, comprising:
the limestone slurry tank is connected with a density meter and a liquid level meter;
the water feeding pump is connected with the limestone slurry tank through a water feeding pipeline provided with a water feeding adjusting door and is used for supplying water to the limestone slurry tank;
the limestone powder bin is used for storing limestone powder;
the feeding machine is arranged on a feeding pipeline between the limestone powder bin and the limestone slurry tank and is used for feeding the limestone powder in the limestone powder bin into the limestone slurry tank;
a controller to:
when a system starting instruction is detected, the feed pump and the feeder are started, and the system is enabled to execute a preset operation mode, wherein the preset operation mode comprises the following steps: controlling the water supply regulating door based on the current set opening degree, controlling the feeding machine based on the current set output force, closing the water supply regulating door and setting the output force of the feeding machine to zero when the current set feeding time is reached, and recording the difference value between the current density and the expected density of the slurry in the limestone slurry tank;
if the absolute value of the difference is larger than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, taking a first preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the first preset output, the current set opening and the current set feeding time;
if the absolute value is larger than the density allowable error, the difference value is smaller than zero, and the current set output is equal to the preset maximum output, taking a first preset opening as a new current set opening, and enabling the system to execute the preset operation mode again based on the current set output, the first preset opening and the current set feeding time;
if the absolute value is larger than the density allowable error and the difference value is larger than zero, taking a second preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the second preset output, the current set opening and the current set feeding time;
if the absolute value is smaller than the density allowable error, performing preset slurry discharging operation for discharging the slurry from the limestone slurry tank, and enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time;
the first preset output is greater than the current set output, the first preset opening is smaller than the current set opening, the second preset output is smaller than the current set output, the current set output is a preset initial output when the system operates for the first time, the current set opening is a preset initial opening when the system operates for the first time, and the current set feeding time is a preset initial feeding time when the system operates for the first time.
2. The system of claim 1, wherein the controller is further configured to:
and after the system repeatedly executes the preset operation mode based on the current set output, the current set opening and the current set feeding time, if the number of times that the absolute value is continuously greater than the density allowable error reaches a preset number of times, stopping the preset slurry discharging operation, and executing the preset operation mode again based on the current set output, the current set opening and the current set feeding time.
3. The system of claim 1, wherein the controller is further configured to:
if the absolute value of the difference is larger than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, Yn+1＝Yn-(Δρn*10/ρExpectation of)*100％；
If the absolute value is greater than the density allowable error, the difference is less than zero, and the current set output is equal to the preset maximum output, Xn+1＝Xn+(Δρn*10/ρExpectation of)*100％；
If the absolute value is greater than the density tolerance and the difference is greater than zero, Yn+1＝Yn-(Δρn*10/ρExpectation of)*100％；
Wherein, Yn+1For a new current set force, YnFor said currently set output, Δ ρnIs the difference, pExpectation ofFor the desired density, n is the number of times the system executes the preset operating mode, Xn+1For a new currently set opening, XnAnd setting the opening degree for the current time.
4. The system of claim 1, wherein the controller is further configured to:
before the system is caused to execute the preset running mode for the first time, the system is caused to execute a preset debugging mode, wherein the preset debugging mode comprises the following steps: controlling the water supply adjusting door based on the current debugging opening degree, controlling the feeding machine based on the current debugging output, closing the water supply adjusting door and setting the output of the feeding machine to zero when the preset feeding time is reached, and recording a first density difference value between the current debugging density and the expected density of the slurry in the limestone slurry tank;
and determining the preset initial output and the preset initial opening degree based on the first density difference value.
5. The system of claim 4, wherein the controller is further specifically configured to:
if the first density difference is larger than zero, taking a third preset output as a new current debugging output, enabling the system to execute the preset debugging mode again based on the third preset output, the current debugging opening and the preset feeding time, determining a second density difference between a new debugging density and the current debugging density, taking the current debugging opening as the preset initial opening, and determining the preset initial output according to the second density difference;
if the first density difference is smaller than zero, taking a second preset opening as a new current debugging opening, enabling the system to execute the preset debugging mode again based on the current debugging output, the second preset opening and the preset feeding time, determining the second density difference, taking the current debugging output as the preset initial output, and determining the preset initial opening according to the second density difference;
the third preset output is smaller than the current debugging output, the initial debugging output when the system executes the preset debugging mode for the first time is the preset maximum output, the second preset opening is smaller than the current debugging opening, and the initial debugging opening when the system executes the preset debugging mode for the first time is the preset maximum opening of the water supply adjusting door.
6. The system of claim 5, wherein the controller is further specifically configured to:
if the first density difference value is larger than zero and the second density difference value is larger than zero, taking the third preset output as a new current debugging output, and enabling the system to repeatedly execute the preset debugging mode based on the third preset output, the current debugging opening and the preset feeding time until the second density difference value is smaller than zero;
if the first density difference is larger than zero and the second density difference is smaller than zero, taking a fourth preset output as a new current debugging output, and enabling the system to repeatedly execute the preset debugging mode based on the fourth preset output, the current debugging opening and the preset feeding time until the first density difference is equal to zero or the execution times of the preset debugging mode reach preset execution times, and determining the preset initial output according to the debugging output when the first density difference is equal to zero or the execution times reach the preset execution times;
if the first density difference value is smaller than zero and the second density difference value is smaller than zero, taking the second preset opening as a new current debugging opening, and enabling the system to repeatedly execute the preset debugging mode based on the current debugging output, the second preset opening and the preset feeding time until the second density difference value is larger than zero;
if the first density difference is smaller than zero and the second density difference is larger than zero, taking a third preset opening as a new current debugging opening, and enabling the system to repeatedly execute the preset debugging mode based on the current debugging output, the third preset opening and the preset feeding time until the first density difference is equal to zero or the execution times reach the preset execution times, and determining the preset initial opening according to the debugging opening when the first density difference is equal to zero or the execution times reach the preset execution times;
and the fourth preset output is greater than the current debugging output, and the third preset opening is greater than the current debugging opening.
7. The system of claim 6, wherein the controller is further specifically configured to:
if the first density difference is greater than zero, ym＝ym-1/2；
If the first density difference is greater than zero and the second density difference is less than zero, ym＝ym-1+d*k，d＝-(ym-1*ΔEm)/(ym*Δρm)，k＝(|ΔEm-1+Δρm-1|)/(ΔEm-1-Δρm-1)；
If the first density difference is less than zero, xm＝xm-1/2；
If the first density difference is less than zero and the second density difference is greater than zero, xm＝xm-1+c*k，c＝-(xm-1*ΔEm)/(xm*Δρm)；
Wherein, ymForce, y, for a new current debugm-1M is the number of times the system executes the preset debugging mode, Delta E, for the current debugging outputmFor a new first density difference, Δ Em-1For the current first density difference, Δ ρmFor new second density difference, Δ ρm-1Is the current second density difference, xmFor a new current debug opening, xm-1Setting the current debugging opening degree;
wherein the preset initial feeding time is S1, S1 ═ LExpectation of-Lm)/(L1-L0)*S，LmIs the liquid level, L, of the limestone slurry tank when the first density difference value is equal to zeroExpectation ofFor a preset desired level, L, of the limestone slurry tank1For the limestone slurry tank to be at the liquid level, L, after the system first executes the preset debugging mode0And S is the preset feeding time, wherein the limestone slurry tank is at the liquid level before the system executes the preset debugging mode for the first time.
8. The system of any one of claims 1 to 7, wherein a stirrer is arranged in the limestone slurry tank, the inlet of the feeding machine is connected with a hot air pipeline, and the hot air pipeline is connected with a hot air blower.
9. A method of controlling a limestone slurry preparation system, the system comprising:
the limestone slurry tank is connected with a density meter and a liquid level meter;
the water feeding pump is connected with the limestone slurry tank through a water feeding pipeline provided with a water feeding adjusting door and is used for supplying water to the limestone slurry tank;
the limestone powder bin is used for storing limestone powder;
the feeding machine is arranged on a feeding pipeline between the limestone powder bin and the limestone slurry tank and is used for feeding the limestone powder in the limestone powder bin into the limestone slurry tank;
a controller;
the method is applied to the controller and comprises the following steps:
when a system starting instruction is detected, the feed pump and the feeder are started, and the system is enabled to execute a preset operation mode, wherein the preset operation mode comprises the following steps: controlling the water supply regulating door based on the current set opening degree, controlling the feeding machine based on the current set output force, closing the water supply regulating door and setting the output force of the feeding machine to zero when the current set feeding time is reached, and recording the difference value between the current density and the expected density of the slurry in the limestone slurry tank;
if the absolute value of the difference is larger than the density allowable error, the difference is smaller than zero, and the current set output is smaller than the preset maximum output, taking a first preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the first preset output, the current set opening and the current set feeding time;
if the absolute value is larger than the density allowable error, the difference value is smaller than zero, and the current set output is equal to the preset maximum output, taking a first preset opening as a new current set opening, and enabling the system to execute the preset operation mode again based on the current set output, the first preset opening and the current set feeding time;
if the absolute value is larger than the density allowable error and the difference value is larger than zero, taking a second preset output as a new current set output, and enabling the system to execute the preset operation mode again based on the second preset output, the current set opening and the current set feeding time;
if the absolute value is smaller than the density allowable error, performing preset slurry discharging operation for discharging the slurry from the limestone slurry tank, and enabling the system to repeatedly execute the preset operation mode based on the current set output, the current set opening and the current set feeding time;
the first preset output is greater than the current set output, the first preset opening is smaller than the current set opening, the second preset output is smaller than the current set output, the current set output is a preset initial output when the system operates for the first time, the current set opening is a preset initial opening when the system operates for the first time, and the current set feeding time is a preset initial feeding time when the system operates for the first time.
10. The method of claim 9, wherein after causing the system to repeatedly perform the preset mode of operation based on the current set output, the current set opening, and the current set dosing time, the method further comprises:
and if the number of times that the absolute value is continuously larger than the density allowable error reaches a preset number of times, stopping the preset slurry discharging operation, and enabling the system to execute the preset operation mode again based on the currently set output, the currently set opening and the currently set feeding time.
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| US4475818A (en) * | 1983-08-25 | 1984-10-09 | Bialkowski Wojciech L | Asphalt coating mix automatic limestone control |
| CN113144966A (en) * | 2021-05-28 | 2021-07-23 | 华能伊春热电有限公司 | Limestone slurry preparation device and preparation method thereof |
| CN113181799A (en) * | 2021-04-30 | 2021-07-30 | 华能伊春热电有限公司 | Limestone slurry preparation system and control method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4475818A (en) * | 1983-08-25 | 1984-10-09 | Bialkowski Wojciech L | Asphalt coating mix automatic limestone control |
| CN113181799A (en) * | 2021-04-30 | 2021-07-30 | 华能伊春热电有限公司 | Limestone slurry preparation system and control method |
| CN113144966A (en) * | 2021-05-28 | 2021-07-23 | 华能伊春热电有限公司 | Limestone slurry preparation device and preparation method thereof |
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