CN114747794B - Cut stem dryer outlet water content control method based on accumulation and strategy - Google Patents
Cut stem dryer outlet water content control method based on accumulation and strategy Download PDFInfo
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B9/00—Control of the moisture content of tobacco products, e.g. cigars, cigarettes, pipe tobacco
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
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Abstract
The invention discloses a cut stem dryer outlet water content control method based on an accumulation and strategy, which adopts statistical analysis of process data trend to construct a refined feedforward and feedback integration control strategy with quick response. Specifically, an accumulative sum mechanism is adopted to carry out predictive analysis on the variation trend of the incoming material water content and the outlet water content, and an integrated control strategy combining feedforward control and feedback control is constructed: comparing the statistical value related to the incoming material with the historical distribution rule to determine the trend of the moisture content of the incoming material, and accordingly, performing feedforward air door regulation and control; and comparing the statistical value related to the moisture content of the outlet with a plurality of outlet moisture content threshold values to determine the state of the current moisture content of the outlet, further performing hierarchical feedback regulation and control on the opening degree of the air door, and finally controlling the moisture content of the dried cut stems by combining feedforward, feedback regulation and PID regulation and control. The method can greatly improve the process quality level of the moisture content of the cut stem drying outlet, and effectively improve the quality control capability of the process.
Description
Technical Field
The invention relates to the field of cigarette manufacturing, in particular to a cut stem dryer outlet moisture content control method based on an accumulation and strategy.
Background
The tobacco stalk is one of important raw materials for cigarette production, the physical and chemical properties of the tobacco stalk are obviously different from those of tobacco leaves, and a separate processing technology is usually adopted. The cut stem drying equipment achieves the effects of improving the filling value and elasticity of cut stems, reducing breakage, improving the sensory quality of finished cut tobacco and the like by performing flash evaporation puffing and drying on the cut stems.
In recent years, the research on the stem drying process mainly focuses on the influence of process parameters on chemical components, for example, the research on the influence of steam pressure on the chemical components, the fragrance components, the microstructure and other aspects of the stem can cause more remarkable influence, and a method for treating the tobacco stems by using high-temperature and high-pressure steam is constructed; analyzing the influence relationship of the change of steam pressure on the removal efficiency of hemicellulose and lignin in the cut stems; the influence of the change of steam pressure on the cut stem filling value, the cut stem finishing rate, the sensory quality and the like is researched; and the influence of steam pressure, action time and the like on chemical components, filling performance, sensory quality and the like of the tobacco stems is researched by adopting an orthogonal test method, and the better process condition of the tobacco stem steam pressurization and moisture regaining is determined by adopting a comprehensive balance method. Although the above research in the field promotes the overall improvement of the cut stem drying production process, in the control of specific production practice, production managers mainly ensure the processing quality by controlling the moisture content of cut stems because the chemical components of various cut stems are difficult to rapidly detect on site and cannot effectively guide the real-time control of the production process.
The quality of the control of the moisture content of the cut stems directly determines the final quality of the cut stem processing technology, and is a key quality characteristic in the tobacco shredding process. The existing cut tobacco drying equipment is improved, the drying temperature of cut tobacco drying is effectively reduced by changing a drying pipeline of the equipment into a pipe-tower combined type and increasing the length of the pipeline, and the drastic change of the moisture content of cut stems is avoided; a heating and dewatering device is additionally arranged in the flash evaporation equipment, so that condensed water condensed on the inner wall of the discharge port is gasified and discharged, and the increase of the water content of the condensed water caused by the falling of the condensed water into the cut stems is avoided; and a popped feed arrangement of flash distillation formula stalk silk, the adhesion of stalk silk is avoided to the accessible reduces inlet pipe outer wall temperature to improve the homogeneity of stalk silk moisture content.
These existing schemes improve the cut stem moisture content from the perspective of equipment transformation, but in actual production, the transformation of equipment can only solve some comparatively outstanding problems, for example, moisture content that the comdenstion water brought changes etc. most moisture content's fluctuation mainly carries out automatic control by PID feedback control, but often has that response speed is slow, control is untimely, process ability subalternation problem. In particular, the cut stem drying equipment is generally classified into an air flow type and a drum type, wherein a low-speed air flow dryer is one type which is widely adopted at present. The machine type takes steam as a heat source, partial moisture in cut stems is taken away through hot air, and the air volume is mainly determined by the opening degree of a moisture exhaust air door, so that the moisture content of an outlet can be controlled by adjusting the opening degree of the moisture exhaust air door. In the actual production process, real-time data of the moisture content of the outlet is detected by a moisture meter at the outlet position of the dryer and is transmitted to a PID control system, and the PID control system adjusts the moisture-removing opening according to the deviation from a set target value of the moisture content of the outlet in real time. However, due to the fact that PID control response is slow, control accuracy is not high, and large quality fluctuation is easy to occur under the condition that the water content of incoming materials is not stable enough.
Disclosure of Invention
In view of the above, the present invention aims to provide a cut stem dryer outlet moisture content control method based on an accumulation sum strategy to solve the aforementioned technical problems.
The technical scheme adopted by the invention is as follows:
the invention provides a cut stem dryer outlet moisture content control method based on an accumulation and strategy, which comprises the following steps:
acquiring historical distribution conditions of the moisture content of incoming cut stems based on historical batch data of the incoming cut stems with the same grade;
according to a preset accumulation and strategy, obtaining a first statistic by utilizing the current incoming material water content detected in real time and a preset first offset coefficient;
comparing the first statistic with the historical distribution condition, and determining the trend of the moisture content of the incoming material at the current moment;
when the incoming material moisture content trend changes relative to the historical distribution situation, performing feedforward regulation on the opening of a moisture exhaust air door of the dryer;
according to a preset accumulation and strategy, obtaining second statistics by using the current outlet moisture content detected in real time, a preset target outlet moisture content and a preset second offset coefficient;
determining different states of the current outlet moisture content and performing graded feedback regulation and control on the opening of a moisture exhaust air door of the dryer based on the second statistic and the relationship of a plurality of preset outlet moisture content thresholds;
and controlling the moisture content of the dried cut stems by combining the feedforward regulation and control, the feedback regulation and control and the preset PID regulation and control on the opening degree of the moisture exhaust air door of the dryer.
In at least one possible implementation manner, after the opening degree of a moisture exhaust air door of the dryer is subjected to feed-forward regulation and control, the distribution condition of the moisture content of the incoming material is updated;
and taking the updated distribution situation as a historical distribution situation, and continuously monitoring the incoming material water content trend at a later moment.
In at least one possible implementation manner, the updating the distribution of the incoming material water content includes: and estimating the distribution condition of the water content of the new incoming material based on the mean value of the measured values of the water content of the incoming material at the current moment and a plurality of previous moments.
In at least one possible implementation manner, the obtaining the second statistic by using the current outlet moisture content detected in real time, the preset target outlet moisture content, and the preset second offset coefficient includes:
calculating the difference value between the current outlet water content and the target outlet water content;
and obtaining a second statistic by using the difference value and the second offset coefficient related to a preset standard deviation.
In at least one possible implementation mode, the opening degree of the moisture exhaust air door of the dryer is subjected to feedforward and feedback regulation according to a preset initial gradient, and the initial gradient is obtained by expert experience.
In at least one possible implementation manner, the hierarchical feedback regulation includes: the initial gradient includes a number of gradient levels corresponding to a degree of deviation of a current exit moisture content from the exit moisture content threshold.
In at least one possible implementation manner, after the same control strategy is used for regulating and controlling for each preset number of times, self-learning optimization is carried out on the initial gradient.
In at least one possible implementation manner, the self-learning optimization of the initial gradient includes:
after the initial gradient is used for carrying out primary feedforward regulation or feedback regulation on the opening of a moisture exhaust air door of the dryer, acquiring the real-time outlet water content after preset time delay;
obtaining a corresponding real-time standard deviation value according to the real-time outlet water content after each regulation;
when the times of the same type of regulation reach preset times, calculating a deviation mean value of the real-time standard deviation value;
and changing or maintaining the initial gradient based on the comparison relationship between the deviation mean value and a preset deviation threshold value.
The main design concept of the invention is that based on the traditional PID control system of the cut stem drying process, the statistical analysis of the process data trend is adopted to construct a refined feedforward and feedback integration control strategy with quick response. Specifically, on the basis of the original PID feedback control, a Cumulative sum (CUSUM) mechanism is adopted to carry out predictive analysis on the variation trend of the incoming material water content and the outlet water content, and an integrated control strategy combining feedforward and feedback control is constructed: comparing the statistical value related to the incoming material with the historical distribution rule to determine the trend of the moisture content of the incoming material, and accordingly, performing feedforward air door regulation and control; and comparing the statistical value related to the moisture content of the outlet with a plurality of outlet moisture content threshold values to determine the state of the current moisture content of the outlet, further performing hierarchical feedback regulation and control on the opening degree of the air door, and finally controlling the moisture content of the dried cut stems by combining feedforward feedback regulation and traditional PID regulation and control. The integrated control strategy provided by the invention not only can narrow the distribution range of process data, but also can make the process data more uniform, thereby greatly improving the process quality level of the moisture content of the cut stem drying outlet and effectively improving the quality control capability of the process.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of a cut stem dryer outlet moisture content control method based on an accumulation and strategy according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention provides an embodiment of a cut stem dryer outlet moisture content control method based on an accumulation and strategy, and specifically, as shown in fig. 1, the method comprises the following steps:
s1, acquiring historical distribution conditions of incoming material water content based on historical batch data of the same-grade cut stem incoming material;
s2, according to a preset accumulation and strategy, obtaining a first statistic by utilizing the current incoming material water content detected in real time and a preset first offset coefficient;
s3, comparing the first statistical quantity with the historical distribution condition, and determining the trend of the moisture content of the incoming material at the current moment;
s4, when the trend of the moisture content of the incoming material changes relative to the historical distribution situation, performing feedforward regulation on the opening of a moisture exhaust air door of the dryer;
s5, according to a preset accumulation and strategy, obtaining second statistics by utilizing the current outlet moisture content detected in real time, a preset target outlet moisture content and a preset second offset coefficient;
s6, determining different states of the current outlet moisture content and performing hierarchical feedback regulation and control on the opening degree of a moisture exhaust air door of the dryer based on the second statistic and the relationship of a plurality of preset outlet moisture content thresholds;
and S7, controlling the moisture content of the dried cut stems by combining the feedforward regulation and control, the feedback regulation and control and the preset PID regulation and control on the opening degree of the moisture exhaust air door of the dryer.
Further, after the opening of the moisture exhaust air door of the dryer is subjected to feedforward adjustment and control, the distribution condition of the water content of the incoming material is updated;
and taking the updated distribution situation as a historical distribution situation, and continuously monitoring the trend of the water content of the incoming material at the later moment.
Based on this, the updating of the distribution of the incoming material water content includes: and estimating the distribution condition of the water content of the new incoming material based on the mean value of the measured values of the water content of the incoming material at the current moment and a plurality of previous moments.
Further, the obtaining a second statistic by using the current outlet moisture content detected in real time, the preset target outlet moisture content and the preset second offset coefficient includes:
calculating the difference value between the current outlet water content and the target outlet water content;
and obtaining a second statistic by using the difference value and the second offset coefficient related to a preset standard deviation.
And further, performing feedforward and feedback regulation on the opening of a moisture exhaust air door of the dryer according to a preset initial gradient, wherein the initial gradient is obtained by expert experience.
Based on this, in one aspect, the hierarchical feedback regulation comprises: the initial gradient includes a number of gradient levels corresponding to a degree of deviation of a current exit moisture content from the exit moisture content threshold.
And on the other hand, after the same control strategy is used for regulating and controlling for each preset time, self-learning optimization is carried out on the initial gradient.
Specifically, the self-learning optimization of the initial gradient comprises:
after the initial gradient is used for carrying out primary feedforward regulation or feedback regulation on the opening of a moisture exhaust air door of the dryer, acquiring the real-time outlet water content after preset time delay;
obtaining a corresponding real-time standard deviation value according to the real-time outlet water content after each regulation;
when the times of the same type of regulation reach preset times, calculating a deviation mean value of the real-time standard deviation value;
and changing or maintaining the initial gradient based on the comparison relationship between the deviation mean value and a preset deviation threshold value.
The following is combined with the previous embodiments to perform comprehensive development: fluctuation of the moisture content of the incoming material is an important influence factor influencing the stability of the moisture content of the cut stem drying outlet. Since the time from the inlet to the outlet of the cut stem dryer is about 8 seconds, and the fluctuation trend of the moisture content of the incoming material is compared with the moisture content of the outlet at the corresponding moment after 8 seconds, it can be found that if the moisture content of the incoming material is continuously increased or decreased, the moisture content of the outlet is easily increased or decreased in an integral manner, but the integral change trend of the moisture content of the incoming material cannot be quickly eliminated through PID adjustment, and therefore, the invention considers that the trend change of the moisture content of the incoming material needs to be predicted in time and quickly adjusted.
And then considering to recognize the variation trends of the incoming material and the outlet water content respectively, realizing feedforward and feedback control, and combining the original PID control to form the following integrated control model, wherein the specific strategies of the feedforward and feedback control can be obtained by adopting a Cumulative sum (CUSUM) method according to the variation trends of the incoming material water content and the outlet water content respectively.
The CUSUM method is based on sequential probability ratio inspection in the principle of sequential analysis, accumulates small deviations of the process, achieves the effect of amplification, and improves the prediction and identification capacity of trend changes occurring in the process [12] . Specifically, according to the method, for the cut stem incoming material of the same grade, the approximate distribution condition N (mu, sigma) of the water content of the incoming material can be firstly calculated through historical batch data so as to identify the trend change of the water content of the incoming material. To identify trending changes in incoming feed water content, statistics may be constructed as follows：
Wherein, Y i The real-time detection value of the water content of the incoming material at the ith moment; u is an offset coefficient, which can be generally set to u =0.5 σ;
and
initial value of (2)
Because the CUSUM method has two statistics, the judgment conditions for the trend change in the process are respectively
That is, the upper and lower control limits are ± L, and L =4 σ is usually adopted. The following control strategies can be derived from this:
1) If it is
The moisture content of the incoming material is indicated to have a trend of increasing, more moisture needs to be taken away by increasing the opening degree of the moisture exhaust air door, and the increased trend is generally not very large because CUSUM statistics is sensitive to the change of the moisture content, so that the opening degree value of the moisture exhaust air door can be increased by 1 based on expert experience;
2) Similarly, if
The moisture content of the incoming material is reduced, and the opening value of the moisture exhaust air door of the dryer can be reduced by 1.
3) If it is
And is
And if so, indicating that the moisture content of the incoming material does not trend, and continuously monitoring without adjusting the opening value of the moisture exhaust air door of the drier.
After the trend change of the water content of the incoming material is judged, namely the control strategy of 1) or 2) is executed, the mean value of the process distribution needs to be recalculated. At this time, a new distribution mean value can be estimated based on the mean value of the incoming material water content at the latest 3 moments (the general detection frequency is 5 seconds, and the 3 moments are 15 seconds):
and then, the CUSUM statistic is constructed again according to the formula (1) to continue monitoring.
For the feedback control of the outlet water content, although the PID control system performs the feedback adjustment in real time based on the detection value of the outlet water content, the effect is relatively slow. Therefore, the CUSUM method is used for constructing a faster and more effective feedback control strategy and is combined with PID control. Because the moisture content of the outlet is the key quality characteristic of the cut stem drying process, the standard deviation is less than 0.28 according to the process control requirement of the moisture content of the outlet, and the set value of the standard deviation is set as sigma according to the actual production condition 0 =0.20. Let e k Is the actual detection value x of the water content of the outlet at the k moment k Difference from target value T:
e k ＝x k -T (3)
the CUSUM statistic can be constructed from this:
wherein the offset coefficient s =0.5 σ 0 =0.1; initial value
To be made intoThe timely and accurate adjustment of the water content of the outlet can be realized, and a feedback control strategy can be designed by adopting a grading strategy to ensure that L 1 ＝3σ 0 ＝0.6，L 2 ＝5σ 0 =1.0, then:
1) If it is
If the moisture content of the outlet is obviously increased, more moisture needs to be taken away by increasing the opening degree of the moisture exhaust air door, and the opening degree value of the moisture exhaust air door can be increased by 4;
2) If it is
The moisture content of the outlet is larger, and the opening degree value of the moisture exhaust air door can be increased by 2;
3) If it is
And is
The moisture content of the outlet is stable and does not need to be adjusted;
4) If it is
The moisture content of the outlet is small, and the opening value of the moisture exhaust air door can be reduced by 2;
5) If it is
The moisture content of the outlet is obviously reduced, and the opening value of the moisture exhaust air door can be reduced by 4;
in the feedforward and feedback control strategies, the specific adjustment degree of the opening degree value of the moisture exhaust air door is preliminarily given according to expert experience, and in the actual application process, the adjustment effect of each control strategy can be better analyzed and optimized by self-learning periodically so as to ensure that the control strategy conforms to the actual production condition. For example, the same control strategy is automatically self-learned and optimized (the self-learned trigger condition can be modified according to actual requirements) after each preset number of adjustments, so that the air door opening degree adjustment amount in other feedforward and feedback control strategies is self-learned and optimized.
Specifically, after the initial gradient is used for carrying out once feedforward regulation or feedback regulation on the opening of a moisture exhaust air door of the dryer, the real-time outlet water content after preset delay (such as after 50 seconds) is obtained;
obtaining a corresponding real-time standard deviation value according to the real-time outlet water content after each regulation;
when the times of the same type of regulation reach preset times, calculating a deviation mean value of the real-time standard deviation value;
and changing or maintaining the initial gradient based on the comparison relationship between the deviation mean value and a preset deviation threshold value. For example, if the mean deviation value is less than 0.20, the initial gradient is maintained and the next round of self-learning optimization is performed again; if the deviation mean value is between 0.20 and 0.25, adding 1 to the original amplitude of the opening control amplitude of the moisture exhaust air door of the dryer; and if the deviation mean value is more than 0.25, adding 2 to the original amplitude of the opening degree of the moisture exhaust air door of the dryer.
Through actual verification and analysis: according to the traditional mode, the change degree of the drift of the water content of the outlet is obvious, and the range of data distribution is large, mainly because the response delay is caused by the fact that the original control system is adjusted slowly. After the integrated control strategy provided by the invention is adopted, the distribution range of the process data is narrowed, the process data is more uniform, and the control effect on the water content of the outlet is obviously improved.
In summary, the main design concept of the present invention is to construct a fast-responding refined feedforward and feedback integrated control strategy by using statistical analysis of process data trend based on the traditional PID control system of the cut stem drying process. Specifically, on the basis of the original PID feedback control, a Cumulative sum (CUSUM) mechanism is adopted to carry out predictive analysis on the variation trend of the incoming material water content and the outlet water content, and an integrated control strategy combining feedforward and feedback control is constructed: comparing the statistical value related to the incoming material with the historical distribution rule to determine the trend of the moisture content of the incoming material, and accordingly, performing feedforward air door regulation and control; and comparing the statistical value related to the moisture content of the outlet with a plurality of outlet moisture content threshold values to determine the state of the current moisture content of the outlet, further performing hierarchical feedback regulation and control on the opening degree of the air door, and finally controlling the moisture content of the dried cut stems by combining feedforward feedback regulation and traditional PID regulation and control. The integrated control strategy provided by the invention not only can narrow the distribution range of the process data, but also can make the process data more uniform, thereby greatly improving the process quality level of the moisture content of the cut stem drying outlet and effectively improving the quality control capability of the process.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and the like, refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are only preferred embodiments of the present invention, and it should be understood that the technical features related to the above embodiments and the preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the specific embodiments shown in the drawings, and all changes that can be made or modified to the equivalent embodiments without departing from the spirit and scope of the invention are intended to be covered by the specification and drawings.
Claims (8)
1. The utility model provides a cut stem desiccator export moisture content control method based on totalization and strategy which characterized in that includes:
obtaining historical distribution conditions of the moisture content of the incoming material based on historical batch data of the incoming cut stem material with the same grade, wherein the historical distribution conditions N (mu, sigma) are obtained through the historical batch data;
according to a preset accumulation and strategy, obtaining a first statistic by utilizing the current incoming material water content detected in real time and a preset first offset coefficient, wherein the first statistic is obtained by the following formula:
wherein, Y i Is a real-time detection value of the water content of the incoming material at the ith moment, u is a first offset coefficient,
and
initial value of (2)
Comparing the first statistic with the historical distribution condition, and determining the incoming material water content trend at the current moment, wherein the method comprises the following steps: according to
Comparing with +/-L, and judging whether the moisture content of the current incoming material has trend change, wherein +/-L is an upper and lower control limit, and L =4 sigma;
when the trend of the moisture content of the incoming material changes relative to the historical distribution situation, performing feedforward regulation on the opening of a moisture exhaust air door of the dryer;
according to a preset accumulation and strategy, obtaining second statistics by using the current outlet moisture content detected in real time, a preset target outlet moisture content and a preset second offset coefficient, wherein the second statistics are obtained according to the following formula:
e k ＝x k -T
wherein e is k Is the current outlet water content x at the kth moment k The difference with the target outlet water content T, s is a second offset coefficient,
and
of (2) is calculated
Determining different states of the current outlet moisture content and performing hierarchical feedback regulation and control on the opening degree of a moisture exhaust air door of the dryer based on the second statistic and the relationship of a plurality of preset outlet moisture content thresholds;
and controlling the moisture content of the dried cut stems by combining the feedforward regulation and control, the feedback regulation and control and the preset PID regulation and control on the opening degree of the moisture exhaust air door of the dryer.
2. The cut rolled stem dryer outlet moisture content control method based on the accumulation and strategy as claimed in claim 1, characterized in that after feedforward regulation and control are performed on the opening degree of a dryer moisture exhaust air door, the distribution condition of incoming material moisture content is updated;
and taking the updated distribution situation as a historical distribution situation, and continuously monitoring the incoming material water content trend at a later moment.
3. The cut rolled stem dryer outlet moisture content control method based on the accumulation and strategy as claimed in claim 2, wherein the updating of the incoming material moisture content distribution includes: and estimating the distribution condition of the water content of the new incoming material based on the mean value of the measured values of the water content of the incoming material at the current moment and a plurality of previous moments.
4. The cut stem dryer outlet moisture content control method based on the accumulation and strategy according to claim 1, wherein the obtaining of the second statistic by using the current outlet moisture content detected in real time, the preset target outlet moisture content and the preset second offset coefficient comprises:
calculating the difference value between the current outlet water content and the target outlet water content;
and obtaining a second statistic by using the difference value and the second offset coefficient related to a preset standard deviation.
5. The cut rolled stem dryer outlet moisture content control method based on the accumulation and strategy as claimed in claim 1, characterized in that the opening degree of a dryer moisture exhaust air door is controlled in a feedforward and feedback manner according to a preset initial gradient, and the initial gradient is obtained by expert experience.
6. The cut rolled stem dryer outlet moisture content control method based on the accumulation and strategy as claimed in claim 5, wherein the staged feedback regulation comprises: the initial gradient includes a number of gradient levels corresponding to a degree of deviation of a current exit moisture content from the exit moisture content threshold.
7. The cut rolled stem dryer outlet moisture content control method based on the accumulation and strategy as claimed in claim 5, characterized in that the initial gradient is self-learned and optimized after every preset number of times of regulation and control by the same control strategy.
8. The cut rolled stem dryer outlet moisture content control method based on the summation strategy according to claim 7, wherein the self-learning optimization of the initial gradient comprises:
after the initial gradient is used for carrying out primary feedforward regulation or feedback regulation on the opening of a moisture exhaust air door of the dryer, acquiring the real-time outlet water content after preset time delay;
obtaining a corresponding real-time standard deviation value according to the real-time outlet water content after each regulation;
when the times of the same type of regulation reach preset times, calculating a deviation mean value of the real-time standard deviation value;
and changing or maintaining the initial gradient based on the comparison relationship between the deviation mean value and a preset deviation threshold value.
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