CN114442710A - Water supply control system and method for material mixing and pelletizing process and storage medium - Google Patents
Water supply control system and method for material mixing and pelletizing process and storage medium Download PDFInfo
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- CN114442710A CN114442710A CN202210081946.XA CN202210081946A CN114442710A CN 114442710 A CN114442710 A CN 114442710A CN 202210081946 A CN202210081946 A CN 202210081946A CN 114442710 A CN114442710 A CN 114442710A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/02—Methods or layout of installations for water supply for public or like main supply for industrial use
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B11/00—Arrangements or adaptations of tanks for water supply
- E03B11/10—Arrangements or adaptations of tanks for water supply for public or like main water supply
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B5/00—Use of pumping plants or installations; Layouts thereof
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/072—Arrangement of flowmeters
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
Abstract
The invention provides a water supply control system and method for a material mixing and pelletizing process and a storage medium. In addition, by analyzing the change rate of the water supply amount of the water supply pipeline, the pneumatic water tank/the first variable-frequency water-feeding pump/the second variable-frequency water-feeding pump are adjusted in a targeted manner according to the conditions of different change rates, so that the current pressure value in the water supply pipeline is maintained within a preset range. The invention fully utilizes the effective frequency modulation ranges of the first variable-frequency water feed pump and the second variable-frequency water feed pump to realize the whole-process high-precision, high-stability and high-efficiency adjustment of the water adding amount of the mixture through quantity increase and decrease, model collocation and cooperation of the air pressure water tanks.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a water supply control system and method for a material mixing and pelletizing process and a storage medium.
Background
As an important process for smelting iron and steel, the mixing and pelletizing process is mainly to add water to iron-containing ore powder, various solvents, fuels and other granular substances, mix them uniformly and pelletize them into pellets. The water added into the mixer and the pelletizer has an extremely important influence on the production of the sintering and pelletizing process, and directly influences the production speed, the final yield and the energy consumption of the sintering and pelletizing process. The existing water supply process for adding water to a mixer and a pelletizer mainly comprises three types, namely a power frequency water supply pump and a manual valve, a power frequency water supply pump and an electric regulating valve, a variable frequency water supply pump and an electric regulating valve (see the attached figures 1-3 for details). Wherein the content of the first and second substances,
the water supply process of the line-frequency water supply pump matched with the manual valve for adjusting the flow is shown in the attached figure 1. In the water adding process, a water watching post worker observes the dry and wet degree of the mixture, the water adding amount is determined by combining experience, and then the water adding amount is adjusted to the proper dry and wet degree by manually adjusting the opening degree of a valve.
The water supply process of the power frequency water supply pump matched with the electric regulating valve for regulating the flow is shown in the attached figure 2. The water adding process is to detect the water content of the mixture through a water detector, calculate the water adding amount according to the production requirement of the sintering and pelletizing process, then combine the flow feedback signal of the water supply pipeline, remotely control and adjust the electric regulating valve, and adjust the flow value of the water supply pipeline to be equal to the calculated water adding amount.
The water supply process of the variable-frequency water supply pump matched with the electric regulating valve for regulating the flow is shown in the attached figure 3. The water adding process is to detect the water content of the mixture through a water detector, calculate the water adding amount according to the production requirement of the sintering and pelletizing process, and then remotely adjust the current frequency of a water pump motor by combining a water supply pipeline flow feedback signal, change the rotating speed of the water pump and control the water adding amount. However, when the flow of the water pump cannot be equal to the calculated water adding amount only by adjusting the current frequency of the motor, the current frequency of the motor is adjusted by remotely controlling and adjusting the electric adjusting valve in a matching manner so as to meet the requirement of the water adding amount in the sintering and pelletizing process.
The three existing water supply processes of the mixer and the pelletizer for adding water have a plurality of problems and defects in the practical production application of a sintering and pelletizing plant, do not meet the trends of carbon reduction, consumption reduction, intelligent management and green development of the national iron and steel industry, and are mainly expressed in the following points:
(1) the automatic control level is low, and the labor intensity of manpower is high. The water control of a part of the mixture in the steel plant still adopts the on-site manual water adding adjustment technology, and the automation level is low; a water-watching post worker needs to comprehensively calculate and adjust the water adding amount according to the water content of incoming materials, the on-site observation of the feeding and discharging dryness and humidity of a mixer and a granulator and the feedback information of the material condition on the surface of the trolley observed by a sintering machine fireman; the labor intensity is high.
(2) The water adding amount of the mixture is artificially observed, empirically judged and calculated, and the water control deviation of the mixture is larger due to the response hysteresis of the water adding amount fluctuation of the raw material water content change and the uncertainty and non-quantification of the artificial experience. People with different qualities, responsibility and rich experience observe the dry and wet conditions of the mixture and have different timeliness and accuracy for adjusting the moisture; human factors are key to affecting the moisture stability of the mix and are also the most uncertain and unsolved problem. The manual water adding control of the mixing system is influenced by a plurality of factors, and the ideal effects of stable moisture and accurate control are difficult to achieve.
(3) The flow of the power frequency water pump changes only by adjusting the opening degree of the valve, changes the friction resistance of a water supply pipeline, can cause the fluctuation of water supply pressure, and can influence the outflow effect of a nozzle of a pipe orifice of a water supply pipe. The water feeding pipeline and the nozzle of the water spraying pipe orifice in the mixer and the granulator are fixed, parameters such as the outflow coefficient of the nozzle are also fixed, and the water feeding effect (water mist, water column and the like) of the nozzle is related to the water spraying area and the pressure of the pipe orifice. The Q-H curve of the power frequency operation water pump is unchanged, the Q-H curve of the water supply pipeline can change under the change of the opening degree of the adjusting valve, and the operation working condition point of the power frequency water pump moves back and forth to generate water supply pressure fluctuation, so that the water adding effect of the spray head is influenced.
(4) The feed pump power frequency operation can deviate from the high efficiency region when not rated operating mode, and the efficiency is lower especially when the low discharge, causes the energy waste, does not accord with low carbon energy-saving requirement. The type of the power frequency water pump is selected in the high-efficiency area according to the rated working condition, a certain flow range close to the rated flow is the high-efficiency area, the adding water quantity of the mixer and the granulator is a range value (0-maximum adding water quantity) with a large span, and when the adding water quantity is smaller or larger and is not in the high-efficiency area of the water pump, the efficiency of a water pump motor is lower, and the water pump motor is in the working condition of low-efficiency and high-energy consumption operation.
(5) The rotating speed of the variable-frequency speed-regulating water pump and the output flow are not in a linear corresponding relation, the requirement of a precise water adding process under small fluctuation of the flow cannot be realized only by regulating the rotating speed, and the regulation stability and precision are poor. The rotating speed of the variable frequency motor changes along with the change of the current frequency of the motor, the effective adjusting range of the current frequency is small, and the fluctuation with small frequency can cause the change with large rotating speed of the water pump, so that the requirement of the fluctuation with small flow on the frequency adjusting precision is extremely high by buffering the fluctuation with small flow rate by frequency adjusting and speed adjusting, the current self-control design of the water pump rarely finely defines the current frequency of the motor, and the adjusting stability and the precision are poor.
(6) The effective frequency modulation range of a single variable-frequency speed control pump is small, and when the current frequency is reduced to a certain value in low flow, the water pump idles without output flow, thereby not only wasting energy, but also not meeting the water adding requirement of the process. Each water pump has a designed lift and a minimum lift in technical performance parameters, wherein the minimum lift is related to equipment manufacture, the minimum lift corresponds to a minimum water pump rotating speed and a minimum motor frequency, when the minimum lift is lower than the designed lift, the water pressure generated by the rotation of a water pump impeller cannot reach the pressure required by the minimum lift, and the water pump has no output flow; just above this value, the pump will experience a step change in flow rate from zero to a higher value. Therefore, the flow regulation of a single variable-frequency speed regulating pump cannot be realized at low flow.
(7) In the actual existing water supply process of the frequency conversion pump matched with the electric control valve, in a low-flow regulation interval, the frequency conversion speed can not be regulated, the mode that the opening degree of the regulating valve is adjusted to change the friction resistance of a water supply pipeline is still adopted for operation, the energy is still wasted under the condition similar to the working condition of a power frequency water pump, and the frequency conversion is not thorough. Because the variable frequency speed control pump has an effective variable frequency interval, the requirement of adding water when low flow can not be realized by means of variable frequency, the variable frequency pump can be adjusted to the minimum frequency value of the effective variable frequency interval in practical application, the water outlet flow of the water pump is still larger than the water adding amount required by the process, the flow is adjusted by changing the friction resistance of the water supply pipeline by adjusting the opening degree of the valve, and the variable frequency speed control pump is similar to the operation condition of a power frequency pump at the moment, still can not save energy and increase the operation complexity.
(8) When the frequency-conversion speed-regulation water supply process is used for frequency modulation, the characteristics of a water supply pipeline are unchanged, the flow change can cause large water supply pressure change, and the problems of overshoot, oscillation and the like of a control system are easily caused due to the small pipeline buffering effect and energy storage diluting effect, so that the frequency-conversion automatic control cannot work normally. The calculated water adding amount changes caused by the change of the water content of the mixture are different in size, and the flow changes are adjusted by frequency modulation and speed regulation and valve opening degree regulation to generate overshoot and pipeline vibration; if the water supply pipeline system has certain buffering and energy storage diluting functions, the flow or pressure fluctuation can be absorbed, and the stable operation of the water supply system is more facilitated.
In view of the above, there is a need for a water supply control system and method, and a storage medium for a material mixing and pelletizing process to solve or at least alleviate the above-mentioned drawbacks.
Disclosure of Invention
The invention mainly aims to provide a water supply control system and method for a material mixing and pelletizing process and a storage medium, and aims to solve the problems that in the prior art, the whole-process efficient continuous adjustment of the water adding amount of a mixture cannot be realized, the stability is insufficient, the energy consumption is high, and the accuracy is poor in the material mixing and pelletizing water supply process.
In order to achieve the above object, the present invention provides a water supply control method for a material mixing and pelletizing process, comprising the steps of:
s1, acquiring the water content information of the mixture detected by the water content detector;
s2, acquiring a current flow value of the water supply pipeline detected by the flowmeter and a current pressure value of the water supply pipeline detected by the pressure sensor;
s3, calculating the current water supply quantity of the mixture according to the water content information and the current technological parameter requirement, and judging whether the current water supply quantity is greater than a first preset threshold value;
s41, when the current water supply quantity is larger than the first preset threshold value, adjusting the variable frequency water supply pump according to the current flow value and the current pressure value so as to maintain the current flow value and the current pressure value of the water supply pipeline within a first preset range, and controlling the electric control valve so as to enable the water output quantity of the water outlet nozzle to correspond to the current water supply quantity;
and S42, when the current water supply quantity is smaller than or equal to the first preset threshold value, adjusting the pneumatic water tank according to the current flow value and the current pressure value so as to maintain the current flow and the current pressure value of the water supply pipeline within a second preset range.
Preferably, the step S2 is followed by the step of:
s21, obtaining the change rate of the water supply quantity of the water supply pipeline according to the current flow value and the current water supply quantity value;
s22, judging whether the change rate is larger than a first preset value or not, and judging whether the current flow value is smaller than a second preset threshold value or not; wherein the second preset threshold is smaller than the first preset threshold;
s23, when the change rate is larger than the first preset value and the current flow value is smaller than a second preset threshold value, controlling the variable-frequency feed water pump to be closed, and starting the pneumatic water tank to maintain the current pressure value of the water supply pipeline within a preset range;
and S24, when the change rate is larger than the first preset value and the current flow value is larger than or equal to the second preset threshold value, adjusting the variable-frequency feed water pump to maintain the current pressure value of the water supply pipeline within a preset range.
Preferably, the step S23 includes the steps of:
s231, when the change rate is greater than the first preset value and the current flow value is greater than or equal to the second preset threshold value, judging whether the current flow value is greater than a third preset threshold value and whether the current pressure value is smaller than a first pressure value; wherein the third preset threshold is greater than the second preset threshold;
s232, when the current flow value is larger than the third preset threshold value and the current pressure value is smaller than the first pressure value, closing a second variable-frequency water-feeding pump, and adjusting the first variable-frequency water-feeding pump to maintain the current pressure value of the water supply pipeline within a preset range; and the rated flow of the first variable-frequency water feeding pump is smaller than the rated flow of the second variable-frequency water feeding pump.
Preferably, the step S232 is followed by the step of:
s233, acquiring a pressure value of the pneumatic water tank, and judging whether the pressure value is smaller than a second pressure value; wherein the second pressure value is less than the first pressure value;
and S234, controlling the pneumatic water tank to be closed and stopping supplying water to the water supply pipeline when the pressure value is smaller than the second pressure value.
Preferably, the step S234 further includes the following steps:
s235, judging whether the current flow value is larger than a fourth preset threshold value; wherein the fourth preset threshold is greater than the third preset threshold;
and S236, when the current flow value is larger than the fourth preset threshold value and the current pressure value is smaller than the first pressure value, starting the second variable-frequency water-feeding pump, closing the first variable-frequency water-feeding pump, and adjusting the current frequency of the second variable-frequency water-feeding pump to maintain the current pressure value of the water supply pipeline within a preset range.
Preferably, the step S2 is followed by the step of:
s200, judging whether the change rate is smaller than a second preset value or not, and judging whether the current pressure value is larger than a third pressure value or not;
s201, when the change rate is smaller than the second preset value and the current pressure value is larger than the third pressure value, adjusting the current frequency of the second variable-frequency feed water pump to maintain the current pressure value of the water supply pipeline within a preset range, and entering the step S202;
s202, judging whether the current frequency of the second variable-frequency water-feeding pump is lower than a first preset frequency or not;
s203, when the current frequency of the second variable-frequency water-feeding pump is lower than the first preset frequency, controlling the first variable-frequency water-feeding pump to start.
Preferably, the step S203 is followed by the step of:
s204, judging whether the current frequency of the second variable-frequency water-feeding pump is lower than a second preset frequency;
s205, when the current frequency of the second variable-frequency water feeding pump is lower than the second preset frequency, controlling the second variable-frequency water feeding pump to be closed, and entering the step S206;
s206, judging whether the current frequency of the first variable-frequency water-feeding pump is lower than a third preset frequency;
and S207, when the current frequency of the first variable-frequency water-feeding pump is lower than the third preset frequency, controlling the first variable-frequency water-feeding pump to be closed, and starting the pneumatic water tank so as to maintain the current pressure value of the water supply pipeline within a preset range.
Preferably, the step S2 further includes the steps of:
s71, judging whether the current pressure value is larger than a third pressure value;
and S72, when the current pressure value is larger than the third pressure value, controlling a safety relief valve of the pneumatic water tank to start so as to maintain the current pressure value of the water supply pipeline within a preset range.
In a second aspect, the invention further provides a water supply control system for the material mixing and pelletizing process, which comprises a frequency converter, a first variable-frequency water supply pump and a second variable-frequency water supply pump which are electrically connected with the frequency converter, an air pressure water tank communicated with a water supply pipeline, a flow meter for detecting the flow of the water supply pipeline, an electric regulating valve for regulating the flow of the water supply pipeline, a pressure sensor for detecting the pressure of the water supply pipeline and a moisture detector for detecting the moisture content information of a mixture; the water supply control system of the material mixing and pelletizing process further comprises a memory, a processor and a computer program which is stored in the memory and can be operated on the processor, wherein the processor implements the steps of the water supply control method of the material mixing and pelletizing process when executing the computer program.
In a third aspect, the present invention further provides a storage medium, wherein the storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the above water supply control method for the material mixing and pelletizing process.
Compared with the prior art, the invention has the following beneficial effects:
1. the water supply system adopts the first variable-frequency water supply pump and the second variable-frequency water supply pump and operates in the high-efficiency region within the effective frequency modulation range, so that the operation efficiency is high, and the water supply system is low-carbon and energy-saving; the small fluctuation of the flow and the pressure in the operation can be solved by the buffering and energy storage diluting action of the air pressure water tank; the cooperation of the air pressure water tank and the first variable-frequency water feeding pump is realized during low flow, and the phenomenon of idle running of the water pump after the variable-frequency regulation of the single variable-frequency water feeding pump exceeds the effective range is avoided.
2. The small fluctuation of the flow caused by the nonlinear corresponding relation between the rotating speed of the variable-frequency speed-regulating water pump and the output flow can be buffered and compensated through the air pressure water tank, the requirement of accurate water adding of the process can be met, and the running stability of the system and the water adding accuracy of the mixture are enhanced.
3. The invention solves the problem that energy is wasted when the variable-frequency water feeding pump operates in a non-variable-frequency mode at low flow in the prior art, and energy is not saved.
4. The invention solves the problems of small effective frequency modulation range of a single-type and single-type variable-frequency speed regulating pump and idling of a low-flow variable-frequency regulating water pump, and fully utilizes the effective frequency modulation ranges of the first variable-frequency water feeding pump and the second variable-frequency water feeding pump to realize the whole-process continuous regulation of the water adding amount of the mixture through quantity increase and decrease, model collocation and cooperation of the air pressure water tanks.
5. The effective adjusting volume of the air pressure water tank can be selected according to the requirements of the system buffering and energy storage diluting capacities, the adjustable pressure relief valve arranged on the air pressure water tank can adjust the water pressure in the air pressure water tank, the set value of the working pressure of the water supply pipeline system can be conveniently set according to the outflow effect of the nozzle, and the safety of the system is improved.
6. Automatic, intelligent competent, response fast, subjective little, the mixture moisture adjustment is more timely, more accurate, and the pressure fluctuation of supply channel is less, and the filler pipe mouth of pipe shower nozzle effect of effluenting is stable.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a water supply process diagram of a power frequency water supply pump matched with a manual valve for flow adjustment in the prior art;
FIG. 2 is a water supply process diagram of a power frequency water supply pump matched with an electric regulating valve for regulating flow in the prior art;
FIG. 3 is a water supply process diagram of a prior art medium frequency water supply pump with an electric regulating valve for regulating flow;
FIG. 4 is a feedwater diagram in accordance with an embodiment of the present invention;
FIG. 5 is a schematic flow chart diagram of an embodiment of the present invention;
FIG. 6 is a flowchart illustrating steps included after step S2 in one embodiment of the present invention;
FIG. 7 is a flowchart illustrating steps included after step S2 in another embodiment of the present invention;
FIG. 8 is a flowchart illustrating steps included after step S203 in one embodiment of the present invention;
FIG. 9 is a block diagram of a control system according to an embodiment of the present invention.
The objects, features and advantages of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are 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 at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
In a first aspect, referring to fig. 1 to 9, a water supply control method for a material mixing and pelletizing process in an embodiment provided by the present invention includes the steps of:
s1, acquiring the water content information of the mixture detected by the water content detector;
s2, acquiring the current flow value of the water supply pipeline detected by the flowmeter and the current pressure value of the water supply pipeline detected by the pressure sensor;
and S3, calculating the current water supply quantity of the mixture according to the water content information and the current technological parameter requirement, and judging whether the current water supply quantity is greater than a first preset threshold value. The specific process parameter requirements include, but are not limited to, related process parameters such as air permeability of the trolley mixture, thermal conductivity, particle size of the mixture, quality of the sintered pellet finished product, and the like, and the selection of the specific detail parameters can be determined according to actual needs. Through the process parameter requirement and the control system, for example, the water supply quantity of the mixture to be added, namely the current water supply quantity in the application, is calculated through the matching of the mixture water content detection and the database information of the water addition control expert system, and the output quantity of the whole water supply pipeline can be accurately known, so that the subsequent adjustment is facilitated. The first preset threshold value is determined according to the running condition of the actual water supply pipeline and the set parameters of the air pressure water tank and the variable-frequency water supply pump.
S41, when the current water supply quantity is larger than the first preset threshold value, adjusting the variable frequency water supply pump according to the current flow value and the current pressure value so as to maintain the current flow value and the current pressure value of the water supply pipeline within a first preset range, and controlling the electric regulating valve so as to enable the water output quantity of the water outlet nozzle to correspond to the current water supply quantity. It should be noted that when the required current water supply amount of the mixture is large, the requirement of high precision and high stability cannot be met by adjusting the air pressure water pump, and at the moment, the pressure value in the water supply pipeline is maintained within a preset range by controlling and adjusting the variable frequency water supply pump. It should be noted that the number and the number of stages of the variable-frequency water feeding pumps can be determined according to actual needs, and are determined according to the actual water adding amount adjusting range and the effective variable-frequency high-efficiency interval range of the variable-frequency water feeding pumps. In a preferred embodiment, a first variable frequency feed water pump and a second variable frequency feed water pump are used, wherein the first variable frequency feed water pump has a rated flow rate less than the flow rate of the second variable frequency feed water pump, and a second variable frequency feed water pump is provided.
And S42, when the current water supply quantity is smaller than or equal to the first preset threshold value, adjusting the pneumatic water tank according to the current flow value and the current pressure value so as to maintain the current flow and the current pressure value of the water supply pipeline within a second preset range. In other words, when the current water supply amount required by the mixture is small, the requirement can be met by adjusting in a manner of controlling and adjusting the air pressure water tank. This application is through under the condition of different water supply demands, through closing of control adjustment different water supply equipment, has realized that the mixture adds the continuous regulation of high accuracy, high stability of water steadily.
As a preferred embodiment of the present invention, the step S2 is followed by the step of:
and S21, acquiring the change rate of the water supply quantity of the water supply pipeline according to the current flow value and the current water supply quantity value. As will be understood by those skilled in the art, in the field of steel sintering, the water addition amount of the mixture and the pelletizer is a range value (0-maximum water addition amount) with a relatively large span range, and when the water addition amount is small or is not in the efficient operation range of the variable frequency feed water pump, the motor efficiency of the variable frequency feed water pump is low, so that the variable frequency feed water pump is in an operation condition with low efficiency and high energy consumption. In order to further analyze the variation of the water supply amount in the water supply pipeline, the variation rate is analyzed to further analyze different conditions, and the specific steps are as follows:
s22, judging whether the change rate is larger than a first preset value or not, and judging whether the current flow value is smaller than a second preset threshold value or not; wherein the second preset threshold is smaller than the first preset threshold;
and S23, when the change rate is greater than the first preset value and the current flow value is smaller than a second preset threshold value, controlling the variable-frequency feed water pump to be closed, and starting the pneumatic water tank to maintain the current pressure value of the water supply pipeline within a preset range. In other words, when the flow in the water supply pipeline is in a condition of changing from small to large and the current flow value is smaller than the second preset threshold value, the flow in the water supply pipeline is smaller, the pressure in the water supply pipeline is larger, the variable-frequency water feeding pump is closed, and the current pressure value in the water supply pipeline can be maintained within the preset range only by starting the air pressure water tank.
S24, when the change rate is larger than the first preset value and the current flow value is larger than or equal to the second preset threshold value, adjusting the variable frequency feed water pump to maintain the current pressure value of the water supply pipeline within a preset range. And controlling to start the variable-frequency water supply pump when the current flow value is larger than the second preset threshold value along with the continuous increase of the flow of the water supply pipeline and the requirement cannot be met only by adjusting the air pressure water pump, and keeping the current pressure value of the water supply pipeline within a preset range by adjusting the frequency of the variable-frequency water supply pump.
In addition, what needs to be supplemented is that when the change of the water content of the mixture fed in and out by the mixer and the pelletizer is small, namely the change rate of the water supply quantity in a water supply pipeline is small, the pressure fluctuation of the whole system is small, the functions of pipeline system buffering and energy storage dilution can be exerted through the air pressure water tank at the moment, and the flow/pressure fluctuation is absorbed or supplemented, because the problems of overshoot and oscillation are easily caused by the frequency modulation mode of the variable-frequency water supply pump at the moment.
As a preferred implementation, the step S23 includes the steps of:
s231, when the change rate is greater than the first preset value and the current flow value is greater than or equal to the second preset threshold value, judging whether the current flow value is greater than a third preset threshold value and whether the current pressure value is smaller than a first pressure value; wherein the third preset threshold is greater than the second preset threshold;
s232, when the current flow value is larger than the third preset threshold value and the current pressure value is smaller than the first pressure value, closing a second variable-frequency water-feeding pump, and adjusting the first variable-frequency water-feeding pump to maintain the current pressure value of the water supply pipeline within a preset range; and the rated flow of the first variable-frequency water feeding pump is smaller than the rated flow of the second variable-frequency water feeding pump. It should be noted that, after the flow rate in the water supply pipeline continues to increase, the pressure in the water supply pipeline decreases, and when the pressure in the water supply pipeline is lower than a first pressure value, the first variable-frequency water-feeding pump is controlled to start, and the first variable-frequency water-feeding pump is adjusted, so that the current pressure value of the water supply pipeline is maintained within a preset range.
As another preferred embodiment, the step S232 further includes the following steps:
s233, acquiring a pressure value of the pneumatic water tank, and judging whether the pressure value is smaller than a second pressure value; wherein the second pressure value is less than the first pressure value;
and S234, controlling the pneumatic water tank to be closed and stopping supplying water to the water supply pipeline when the pressure value is smaller than the second pressure value. It is worth noting that by obtaining the pressure value of the pneumatic water tank, when the flow rate in the water supply pipeline is larger than the third preset value, along with the increase of the flow rate, the pressure in the water supply pipeline is reduced, and at the moment, the pneumatic water tank is already in the low-efficiency operation working condition state or cannot meet the requirement through adjusting the pneumatic water tank.
As a preferred embodiment, the step S234 further includes the following steps:
s235, judging whether the current flow value is larger than a fourth preset threshold value; wherein the fourth preset threshold is greater than the third preset threshold;
and S236, when the current flow value is larger than the fourth preset threshold value and the current pressure value is smaller than the first pressure value, starting the second variable-frequency water-feeding pump, closing the first variable-frequency water-feeding pump, and adjusting the current frequency of the second variable-frequency water-feeding pump to maintain the current pressure value of the water supply pipeline within a preset range. It should be noted that, along with the further increase of the flow in the water supply pipeline, when the current pressure value in the water supply pipeline continuously drops to the first pressure value, the second variable frequency water-feeding pump is started at this moment, and the first variable frequency water-feeding pump is closed, and the current frequency of the second variable frequency water-feeding pump is adjusted at the same time, so that the current pressure value in the water supply pipeline can be readjusted to the preset range, and the stability of the pressure in the water supply pipeline is ensured. It should be further noted that the fourth preset threshold in this embodiment may be determined according to the actual flow rate in the water supply pipeline and the effective operation interval of the second variable-frequency feed-water pump, and obviously, the fourth preset threshold is greater than the second preset threshold and the third preset threshold.
As another preferred embodiment of the present invention, the step S2 is followed by the step of:
s200, judging whether the change rate is smaller than a second preset value or not, and judging whether the current pressure value is larger than a third pressure value or not;
s201, when the change rate is smaller than the second preset value and the current pressure value is larger than the third pressure value, adjusting the current frequency of the second variable-frequency feed water pump to maintain the current pressure value of the water supply pipeline within a preset range, and entering the step S202;
s202, judging whether the current frequency of the second variable-frequency water-feeding pump is lower than a first preset frequency or not;
s203, when the current frequency of the second variable-frequency water-feeding pump is lower than the first preset frequency, controlling the first variable-frequency water-feeding pump to start. In this embodiment, the second preset value, the third preset value, and the first preset frequency can be flexibly set by those skilled in the art according to actual needs.
It should be noted that, in the embodiment, by analyzing the situation that the flow rate in the water supply pipeline changes from a large flow rate to a flow rate, as the flow rate decreases, the pressure in the water supply pipeline rises, and the variable frequency feed water pump operates at a reduced frequency along with the increase of the system pressure in the water supply pipeline within the effective adjustment frequency range, so that the current pressure value in the water supply pipeline is restored to the preset range again.
Specifically, when the current frequency of the second variable-frequency water-feeding pump is close to the "lower limit value of the high-efficiency frequency", that is, the first preset frequency in step S202, the first variable-frequency water-feeding pump is controlled to start, and the current pressure value in the water supply pipeline is restored to the preset range again by adjusting the current frequency of the first variable-frequency water-feeding pump.
As another preferred embodiment, the step S203 is followed by the steps of:
s204, judging whether the current frequency of the second variable-frequency water-feeding pump is lower than a second preset frequency; wherein, the second preset frequency can be set according to the actual situation. Of course, in other embodiments, the adjustment may also be achieved by controlling the voltage frequency.
S205, when the current frequency of the second variable-frequency water feeding pump is lower than the second preset frequency, controlling the second variable-frequency water feeding pump to be closed, and entering the step S206;
s206, judging whether the current frequency of the first variable-frequency water-feeding pump is lower than a third preset frequency;
and S207, when the current frequency of the first variable-frequency water-feeding pump is lower than the third preset frequency, controlling the first variable-frequency water-feeding pump to be closed, and starting the pneumatic water tank so as to maintain the current pressure value of the water supply pipeline within a preset range.
This embodiment is through judging whether the current frequency of second frequency conversion feed-water pump is less than the second and predetermines the frequency, and then control the switching of second frequency conversion feed-water pump, it needs to notice, along with the reduction of supply line flow, when the frequency of first frequency conversion feed-water pump reachs the third and predetermines the frequency, for example when its high efficiency frequency's lower limit value, in order to realize accurate water requirement of adding, improve the stability of system operation, close first frequency conversion feed-water pump this moment, and start the atmospheric pressure water pitcher has realized the whole continuous regulation of mixture water adding.
Further, the step S2 further includes the steps of:
s71, judging whether the current pressure value is larger than a third pressure value; and the third pressure value can be set according to actual requirements.
And S72, when the current pressure value is larger than the third pressure value, controlling a safety relief valve of the pneumatic water tank to start so as to maintain the current pressure value of the water supply pipeline within a preset range. This embodiment provides a safety protection mechanism, when the pressure that water supply pipe led to water supply pipe because of system fault or other reasons rises to the biggest operating pressure of system, through control the safety relief valve of atmospheric pressure water pitcher in time carries out the pressure release, maintains the current pressure value of water supply pipe at predetermineeing the within range. Wherein, the preferred diaphragm type atmospheric pressure jar of atmospheric pressure water pitcher, and have the relief valve of adjustable jar internal pressure to the pressure value in the adaptation water supply line changes.
In a second aspect, the invention further provides a water supply control system for the material mixing and pelletizing process, which comprises a frequency converter, a first variable-frequency water supply pump and a second variable-frequency water supply pump which are electrically connected with the frequency converter, an air pressure water tank communicated with a water supply pipeline, a flow meter for detecting the flow of the water supply pipeline, an electric regulating valve for regulating the flow of the water supply pipeline, a pressure sensor for detecting the pressure of the water supply pipeline and a moisture detector for detecting the moisture content information of a mixture; the first variable-frequency water feeding pump and the second variable-frequency water feeding pump are both communicated with the water feeding pipeline, the rated flow rate of the first variable-frequency water feeding pump is smaller than that of the second variable-frequency water feeding pump, the water feeding control system for the material mixing and pelletizing process further comprises a memory 52, a processor 51 and a computer program 53 which is stored in the memory 52 and can run on the processor, and the steps of the water feeding control method for the material mixing and pelletizing process are realized when the processor 51 executes the computer program 53.
In a third aspect, the present invention further provides a storage medium storing a computer program 53, wherein the computer program 53, when executed by the processor 51, implements the steps of the method for diagnosing wheels of a pallet truck as described above. It will be appreciated that the above-described method of electric bicycle swapping control is implemented when executed by the processor 51, and thus all embodiments of the above-described method are applicable to the storage medium and can achieve the same or similar beneficial effects.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A water supply control method for a material mixing and pelletizing process is characterized by comprising the following steps:
s1, acquiring the water content information of the mixture detected by the water content detector;
s2, acquiring the current flow value of the water supply pipeline detected by the flowmeter and the current pressure value of the water supply pipeline detected by the pressure sensor;
s3, calculating the current water supply quantity of the mixture according to the water content information and the current technological parameter requirement, and judging whether the current water supply quantity is greater than a first preset threshold value;
s41, when the current water supply quantity is larger than the first preset threshold value, adjusting the variable frequency water supply pump according to the current flow value and the current pressure value so as to maintain the current flow value and the current pressure value of the water supply pipeline within a first preset range, and controlling the electric control valve so as to enable the water output quantity of the water outlet nozzle to correspond to the current water supply quantity;
and S42, when the current water supply quantity is smaller than or equal to the first preset threshold value, adjusting the pneumatic water tank according to the current flow value and the current pressure value, so that the current flow and the current pressure value of the water supply pipeline are maintained within a second preset range.
2. The feedwater control method of mixing and pelletizing process as claimed in claim 1, wherein said step S2 is followed by the steps of:
s21, obtaining the change rate of the water supply quantity of the water supply pipeline according to the current flow value and the current water supply quantity value;
s22, judging whether the change rate is larger than a first preset value or not, and judging whether the current flow value is smaller than a second preset threshold value or not; wherein the second preset threshold is smaller than the first preset threshold;
s23, when the change rate is greater than the first preset value and the current flow value is smaller than a second preset threshold value, controlling the variable-frequency feed water pump to be closed, and starting the pneumatic water tank to maintain the current pressure value of the water supply pipeline within a preset range;
and S24, when the change rate is larger than the first preset value and the current flow value is larger than or equal to the second preset threshold value, adjusting the variable-frequency feed water pump to maintain the current pressure value of the water supply pipeline within a preset range.
3. The feedwater control method of the mixing and pelletizing process of claim 2, wherein the step S23 comprises the steps of:
s231, when the change rate is greater than the first preset value and the current flow value is greater than or equal to the second preset threshold value, judging whether the current flow value is greater than a third preset threshold value and whether the current pressure value is smaller than a first pressure value; wherein the third preset threshold is greater than the second preset threshold;
s232, when the current flow value is larger than the third preset threshold value and the current pressure value is smaller than the first pressure value, closing a second variable-frequency water-feeding pump, and adjusting the first variable-frequency water-feeding pump to maintain the current pressure value of the water supply pipeline within a preset range; and the rated flow of the first variable-frequency water feeding pump is smaller than the rated flow of the second variable-frequency water feeding pump.
4. The feedwater control method of mixing and pelletizing process of claim 3, further comprising the step after step S232 of:
s233, acquiring a pressure value of the pneumatic water tank, and judging whether the pressure value is smaller than a second pressure value; wherein the second pressure value is less than the first pressure value;
and S234, controlling the pneumatic water tank to be closed and stopping supplying water to the water supply pipeline when the pressure value is smaller than the second pressure value.
5. The feedwater control method of mixing and pelletizing process of claim 4, wherein the step S234 is followed by the step of:
s235, judging whether the current flow value is larger than a fourth preset threshold value; wherein the fourth preset threshold is greater than the third preset threshold;
and S236, when the current flow value is larger than the fourth preset threshold value and the current pressure value is smaller than the first pressure value, starting the second variable-frequency water-feeding pump, closing the first variable-frequency water-feeding pump, and adjusting the current frequency of the second variable-frequency water-feeding pump to maintain the current pressure value of the water supply pipeline within a preset range.
6. The feedwater control method of mixing and pelletizing process as claimed in claim 1, wherein said step S2 is followed by the steps of:
s200, judging whether the change rate is smaller than a second preset value or not, and judging whether the current pressure value is larger than a third pressure value or not;
s201, when the change rate is smaller than the second preset value and the current pressure value is larger than the third pressure value, adjusting the current frequency of the second variable-frequency feed water pump to maintain the current pressure value of the water supply pipeline within a preset range, and entering the step S202;
s202, judging whether the current frequency of the second variable-frequency water-feeding pump is lower than a first preset frequency or not;
s203, when the current frequency of the second variable-frequency water-feeding pump is lower than the first preset frequency, controlling the first variable-frequency water-feeding pump to start.
7. The water supply control method for the material mixing and pelletizing process of claim 6, wherein the step S203 is followed by the step of:
s204, judging whether the current frequency of the second variable-frequency water-feeding pump is lower than a second preset frequency;
s205, when the current frequency of the second variable-frequency water feeding pump is lower than the second preset frequency, controlling the second variable-frequency water feeding pump to be closed, and entering the step S206;
s206, judging whether the current frequency of the first variable-frequency water-feeding pump is lower than a third preset frequency;
and S207, when the current frequency of the first variable-frequency water-feeding pump is lower than the third preset frequency, controlling the first variable-frequency water-feeding pump to be closed, and starting the pneumatic water tank so as to maintain the current pressure value of the water supply pipeline within a preset range.
8. The feedwater control method of the mixing and pelletizing process of claim 1, wherein the step S2 further comprises the steps of:
s71, judging whether the current pressure value is larger than a third pressure value;
and S72, when the current pressure value is larger than the third pressure value, controlling a safety relief valve of the pneumatic water tank to start so as to maintain the current pressure value of the water supply pipeline within a preset range.
9. A water supply control system for a material mixing and pelletizing process is characterized by comprising a frequency converter, a first variable-frequency water supply pump and a second variable-frequency water supply pump which are electrically connected with the frequency converter, an air pressure water tank communicated with a water supply pipeline, a flowmeter for detecting the flow of the water supply pipeline, an electric regulating valve for regulating the flow of the water supply pipeline, a pressure sensor for detecting the pressure of the water supply pipeline and a moisture detector for detecting the moisture content information of a mixture; the water supply control system of the mixing and pelletizing process further comprises a memory, a processor and a computer program which is stored in the memory and can be operated on the processor, wherein the processor executes the computer program to realize the steps of the water supply control method of the mixing and pelletizing process according to any one of claims 1 to 8.
10. A storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the feedwater control method of the mixing and pelletizing process according to any of claims 1 to 8.
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