CN115857440A - Method for controlling conversion of working conditions of process air conditioner in cigarette workshop - Google Patents
Method for controlling conversion of working conditions of process air conditioner in cigarette workshop Download PDFInfo
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- CN115857440A CN115857440A CN202211401408.0A CN202211401408A CN115857440A CN 115857440 A CN115857440 A CN 115857440A CN 202211401408 A CN202211401408 A CN 202211401408A CN 115857440 A CN115857440 A CN 115857440A
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Abstract
The invention discloses a method for controlling the switching of the working conditions of a process air conditioner in a cigarette workshop. The invention can solve a plurality of problems caused by overshoot in the existing central value control process, and can realize the maximization of the energy-saving effect and improve the applicability of temperature and humidity control on the basis of meeting the process requirements.
Description
Technical Field
The invention relates to the field of cigarette manufacturing, in particular to a method for controlling the conversion of the working conditions of a process air conditioner in a cigarette workshop.
Background
With the development of scientific technology and technological requirements, the tobacco processing technology provides more refined requirements for the temperature and humidity control level in a production workshop. At present, the constant temperature and humidity environment in the cigarette production and storage process of a cigarette factory is basically maintained by means of large-scale process air conditioners for automatic centralized control, and the cigarette is generally supplied by an all-air system, so that a proper temperature and humidity environment is provided for cigarette processing and storage.
Taking the temperature automatic control strategy of a process air conditioner in a certain cigarette factory as an example, in order to ensure the stable quality of cigarettes, the temperature of controlled areas such as production, storage and the like should be kept within a relatively stable interval range according to the process requirements. At present, most of temperature control strategies of process air conditioners in cigarette factories adopt central value control, temperature values are collected through a plurality of sensors to represent the average temperature and humidity of a controlled area, which working condition an air conditioning system should enter at present is judged according to control requirements, then automatic adjustment is carried out according to a set temperature target value, corresponding execution elements are controlled to act, the temperature is increased or decreased to the set temperature through the action of a heating valve and a surface cooling valve, and meanwhile, temperature and humidity fluctuation is stabilized within a process requirement allowable range through a series of control theory methods. The temperature control under the strategy is accurately controlled by taking the central value as a target, so that the problems of system overshoot, cold and heat offset and the like are easily caused, and a large amount of energy is wasted.
In terms of development, most of the current methods for controlling the temperature in a cigarette factory are central value control, and taking a production area with a controlled temperature requirement of 24 ± 2 ℃ as an example, in the process of temperature adjustment, the system will control the actions of each execution element by taking the central value of 24 ℃ as a target, so as to control the temperature around a set value. Because the air conditioning system belongs to a large-hysteresis temperature system, the I value is easy to accumulate greatly in the control process, so that the temperature continues to be heated or cooled after reaching a set value. In the temperature adjusting process, the current temperature is lower than the set temperature, the heating valve is opened, the temperature rises, the temperature can exceed the set value in the adjusting process due to lag and overshoot of the system, the PID control value is reversely adjusted and calculated, and the conditions that the working condition is converted from heating to refrigeration and the surface cooling valve is opened to cool are easy to occur. On one hand, the phenomenon causes cold and heat offset, and double waste of cold and heat is caused; on the other hand, frequent switching among different working conditions also causes frequent starting and stopping of each valve, and further causes reduction of service life of equipment.
Aiming at the problem of high energy consumption of a temperature and humidity control system, the process air conditioner in the partial area of the existing cigarette factory adopts temperature and humidity variable control, a temperature and humidity variable interval is set in the upper and lower limit range of the production process requirement, the temperature and humidity in the interval are controlled by corresponding valves under PID control to control the temperature back to the interval when the temperature deviates from the interval. In the real control process, the temperature exceeds the standard when the interval range is set to be overlarge, and the range is similar to the central value control when the interval range is too small, so that the energy-saving effect is avoided; meanwhile, the environment of the production area of the cigarette factory is complex, the temperature and humidity are influenced by various factors such as the running state of a production unit, the heating of a machine table, the external environment and the like, and the temperature control precision of a process air conditioner is also inevitably influenced, so that the applicability of the solution method is not high.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for controlling the switching of the working conditions of a process air conditioner in a cigarette workshop, so as to solve the aforementioned technical problems.
The technical scheme adopted by the invention is as follows:
the invention provides a method for controlling the conversion of the working conditions of a process air conditioner in a cigarette workshop, which comprises the following steps:
setting a refrigerating working condition conversion line and a heating working condition conversion line of a process air conditioner according to the temperature and humidity process requirements of a production area;
judging a temperature regulation and control strategy currently adopted by the process air conditioner, wherein the temperature regulation and control strategy comprises the following steps: central value control or variable temperature humidity control;
under the control of a central value, when the measured temperature deviates from a temperature set value in the regulation and control process and does not reach a preset working condition conversion line, disabling the process air conditioner to switch the working conditions, and triggering the process air conditioner to execute the working condition switching and regulate the temperature until the measured temperature reaches or deviates from the working condition conversion line;
under the control of variable temperature and humidity, when the measured temperature is within the preset heating working condition conversion line and the preset refrigeration working condition conversion line, limiting the output value of the PID controller until the measured temperature deviates upwards or downwards from the corresponding working condition conversion line, triggering the process air conditioner to execute working condition switching and carrying out temperature regulation.
In at least one possible implementation manner, when it is determined that the process air conditioning unit is currently applied to the central value control strategy, the control method specifically includes:
according to the current measured temperature and the preset temperature and humidity process requirements, matching the current working condition of the process air conditioner and setting a temperature set value;
if the current working condition is matched with the heating working condition, starting a heating valve to gradually increase the measured temperature, and forbidding energy triggering to convert the measured temperature into the refrigeration working condition before reaching the refrigeration working condition conversion line;
and triggering to be converted to the refrigeration working condition and carrying out temperature regulation until the actually measured temperature reaches a preset refrigeration working condition conversion line.
In at least one possible implementation manner, when it is determined that the process air conditioning unit is currently applied to the central value control strategy, the control method further includes:
if the current working condition is matched with the refrigeration working condition, the meter cold valve is opened to enable the measured temperature to be gradually reduced, and the energy is forbidden to be triggered and converted into the heating working condition before the current working condition is matched with the refrigeration working condition;
and triggering to be converted to the heating working condition and carrying out temperature regulation until the actually measured temperature reaches a preset heating working condition conversion line.
In at least one possible implementation manner, when it is determined that the process air conditioning unit is currently applied to the central value control strategy, the control method includes:
after the actually measured temperature reaches and deviates from the temperature set value, gradually reducing the opening of the valve corresponding to the current working condition according to the calculated value of the PID controller, and judging the temperature change trend after the valve stops acting;
if the change trend of the actually measured temperature is judged to be approaching to the temperature set value, the closing state of the valve is kept;
and if the change trend of the measured temperature is judged to be that the deviation degree of the measured temperature and the temperature set value is increased, forcibly triggering the working condition switching.
In at least one possible implementation manner, the temperature change trend judgment includes:
setting a time window with a preset length, wherein the time window is internally provided with a plurality of temperature value sets
Calculating the average value of the temperature values contained in the time window before and after sliding according to the preset distance:
and determining the temperature change trend according to the change difference of the temperature average value.
In at least one possible implementation manner, when it is determined that the process air conditioning unit is currently applied to the variable temperature and humidity control strategy, the control method specifically includes:
setting a refrigeration working condition conversion line and a heating working condition conversion line according to historical data;
when the current actually measured temperature is between the refrigerating working condition conversion line and the heating working condition conversion line, limiting the output value of the PID controller to enable the temperature regulation target to dynamically change along with the actually measured temperature;
and when the actually measured temperature is increased to be above the refrigerating working condition conversion line or is reduced to be below the heating working condition conversion line, triggering to be converted to the corresponding refrigerating working condition or heating working condition, and calculating and adjusting the temperature through the PID controller.
In at least one possible implementation manner, when it is determined that the process air conditioning unit is currently applied to the variable temperature humidity control strategy, the control method further includes:
periodically calculating the amplitude of the deviation of the measured temperature from the corresponding working condition conversion line in a preset time period in the process of increasing or decreasing the measured temperature;
based on the amplitude, the corresponding operating condition transfer line is adjusted.
In at least one possible implementation manner, the adjusting the corresponding operating condition switching line includes:
and combining a preset safety factor with the amplitude, and dynamically resetting a corresponding working condition conversion line on the basis of taking the overshoot as an adjustment basis.
The main design concept of the invention is that aiming at the problems of cold and heat offset, frequent valve action, high energy consumption and the like after system overshoot of the original temperature and humidity control strategy of the process air conditioner in the prior cigarette workshop, the decision mechanism of air conditioner working condition switching and PID control mode is optimized by setting a working condition switching line in the temperature control process and utilizing the relation between the measured temperature and the working condition switching line according to the specific temperature regulation strategy of different process air conditioners. The invention can solve a plurality of problems caused by overshoot in the existing central value control process, and can realize the maximization of the energy-saving effect and improve the applicability of temperature and humidity control on the basis of meeting the process requirements.
Drawings
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 method for controlling conversion of process air-conditioning working conditions in a cigarette workshop according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function 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 method for controlling the working condition conversion of a process air conditioner in a cigarette workshop, which takes a temperature control loop as an example, and concretely comprises the following steps as shown in figure 1:
s1, setting a refrigeration working condition conversion line and a heating working condition conversion line of a process air conditioner according to the temperature and humidity process requirements of a production area;
s2, judging a temperature regulation and control strategy currently adopted by the process air conditioner, wherein the temperature regulation and control strategy comprises the following steps: central value control or variable temperature humidity control;
s30, under the control of a central value, when the measured temperature deviates from a temperature set value in the regulation and control process and does not reach a preset working condition conversion line, disabling the process air conditioner to switch the working conditions, and triggering the process air conditioner to execute working condition switching and adjust the temperature until the measured temperature reaches or deviates from the working condition conversion line;
and S40, under the control of variable temperature and humidity, when the measured temperature is within the preset heating working condition conversion line and the preset refrigeration working condition conversion line, limiting the output value of the PID controller until the measured temperature deviates upwards or downwards from the corresponding working condition conversion line, triggering the process air conditioner to execute working condition switching and adjusting the temperature.
Specific implementation examples are provided below for reference to the above two different air conditioner temperature control strategies.
1. When judging that the process air conditioning unit is currently applied to the central value control strategy, setting a temperature set value T S Refrigeration working condition conversion line T C1 Heating condition conversion line T H1 And can be executed by referring to the following specific implementation steps:
(1) Matching the current working condition of the process air conditioner according to the current measured temperature and the preset temperature and humidity process requirement;
(21) If the current working condition is matched with the heating working condition, the heating valve is opened to gradually increase the current measured temperature to the set temperature T S In the above stage, the forbidden energy is triggered and converted into the refrigeration working condition;
(22) Until the current measured temperature reaches the refrigeration working condition conversion line T C1 And triggering to be converted into a refrigeration working condition and carrying out temperature regulation.
(31) If the current working condition is matched with the refrigeration working condition, the meter cooling valve is opened, so that the current measured temperature is gradually reduced to the set temperature T S In the following, the forbidden energy triggering at the stage is converted into a heating working condition;
(32) Until the current measured temperature reaches the heating working condition conversion line T H1 And triggering and converting to a heating working condition and adjusting the temperature.
Further, under this temperature regulation strategy, the method further comprises:
after the current actually measured temperature reaches and deviates from the temperature set value, the valve corresponding to the current working condition (depending on the type of the working condition) gradually reduces the opening degree according to the calculated value of the PID controller, and the temperature change trend is judged after the valve stops acting;
if the change trend of the current actually measured temperature is judged to be approaching to the temperature set value, the closing state of the valve is kept;
and if the change trend of the current actual measurement temperature is judged to be that the deviation degree of the current actual measurement temperature and the temperature set value is increased, forcibly triggering the working condition switching.
Specifically, the temperature change trend judgment includes:
selecting a time window of fixed length i, within which is a set of several temperature values:
T＝{T 1 ，T 2 ，T 3 ，...，T i }
wherein, T 1 ，...，T i The temperature at the corresponding time.
Calculating a first temperature average value within a current time window:
where k is ∈ {1, 2.., i }.
Sliding the time window according to a preset sliding distance a, and calculating a second temperature average value in the time window after sliding:
and by analogy, comparing the n first temperature average values with the second temperature average value to determine the temperature change trend. Therefore, the time factor is combined, when the actually measured temperature is determined to gradually approach the temperature set value, the temperature deviation with the temperature set value can be reduced depending on the influence of the external environment, so that the working condition does not need to be switched, and the corresponding valve can still keep a closed state; on the contrary, when the deviation between the actually measured temperature and the temperature set value is determined to be continuously increased, the influence of the external environment is indicated to be large, and at this time, in order to overcome the influence of the external environment in time, the working condition of the air conditioner can be forcibly switched, the valve corresponding to the switched working condition is triggered to work, and the temperature is adjusted back.
In addition, it can be further described that if the pre-set operating condition is the same as the conversion operating condition, the pre-set operating condition is not triggered, for example, if the current measured temperature is higher (higher than a refrigeration operating condition conversion line), the current process air conditioner is inevitably in the refrigeration operating condition, and when the temperature is regulated and controlled to fall within the refrigeration operating condition conversion line, the air conditioning unit is not affected, the current refrigeration operating condition is continuously maintained, and until the current measured temperature reaches a temperature set value, the meter cooling valve can be triggered to close, and the current refrigeration operating condition is stopped. The humidity control loop is similar.
2. When judging that the process air conditioning unit is currently applied to the temperature and humidity varying control strategy, setting a refrigeration working condition conversion line T according to historical data C2 Heating condition conversion line T H2 And can be executed by referring to the following specific implementation steps:
(1) When the current measured temperature is between the two working condition conversion lines, the temperature regulation target dynamically changes along with the measured temperature, and the output value of the PID controller is limited (namely, the valve does not act at the moment under the corresponding working condition);
(2) When the measured temperature rises to the refrigeration working condition conversion line T C2 Above, or below, the transition line T H2 And when the temperature is lower than the preset temperature, triggering and converting the temperature to a corresponding refrigeration working condition or a heating working condition, calculating and adjusting the temperature through a PID (proportion integration differentiation) controller, and controlling a corresponding valve to adjust the temperature.
Further, under this temperature regulation strategy, the method further comprises:
periodically calculating the amplitude of the actually measured temperature deviating from the working condition conversion line within a preset time period;
and adjusting the working condition conversion line based on the amplitude.
Specifically, under the temperature and humidity control strategy of the process air conditioner, calculating the amplitude of the actually measured temperature deviating upwards from the working condition refrigeration working condition conversion line within a period of time:
e s (t)＝T j (t)-T C2
or, the actually measured temperature deviates downwards from the amplitude of the heating condition conversion line:
e S (t)＝T H2 -T j (t)
based on the calculation result of the amplitude, the range of the variable temperature is expanded or reduced on the basis of the originally set working condition conversion line. In practice, a preset safety factor k can be combined with the amplitude (in k · e) S (t) as the adjustment accuracy standard of the conversion line), dynamically resetting the working condition conversion line on the basis of the overshoot as the adjustment basis, thereby ensuring that the temperature does not exceed the required range of the production process after the working condition conversion line is dynamically changed. The humidity control loop is similar.
In summary, the main design concept of the invention is that, aiming at the problems of cold and heat offset, frequent valve action, high energy consumption and the like after system overshoot of the original temperature and humidity control strategy of the process air conditioner in the existing cigarette workshop, a decision mechanism of air conditioner working condition switching and PID control mode is optimized by setting a working condition switching line in the temperature control process and utilizing the relation between the measured temperature and the working condition switching line according to the specific temperature regulation strategy of different process air conditioners. The invention can solve a plurality of problems caused by overshoot in the existing central value control process, and can realize the maximization of the energy-saving effect and improve the applicability of temperature and humidity control on the basis of meeting the process requirements.
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 similar expressions 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 merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and 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. A method for controlling the conversion of the working conditions of a process air conditioner in a cigarette workshop is characterized by comprising the following steps:
setting a refrigerating working condition conversion line and a heating working condition conversion line of a process air conditioner according to the temperature and humidity process requirements of a production area;
judging a temperature regulation and control strategy currently adopted by the process air conditioner, wherein the temperature regulation and control strategy comprises the following steps: central value control or variable temperature humidity control;
under the control of a central value, when the measured temperature deviates from a temperature set value in the regulation and control process and does not reach a preset working condition conversion line, disabling the process air conditioner to switch the working conditions, and triggering the process air conditioner to execute the working condition switching and regulate the temperature until the measured temperature reaches or deviates from the working condition conversion line;
under the control of variable temperature and humidity, when the measured temperature is within the preset heating working condition conversion line and the preset refrigeration working condition conversion line, limiting the output value of the PID controller until the measured temperature deviates upwards or downwards from the corresponding working condition conversion line, triggering the process air conditioner to execute working condition switching and carrying out temperature regulation.
2. The cigarette workshop process air conditioning working condition conversion control method according to claim 1, wherein when judging that the process air conditioning unit is currently applied to the central value control strategy, the control method specifically comprises the following steps:
according to the current measured temperature and the preset temperature and humidity process requirements, matching the current working condition of the process air conditioner and setting a temperature set value;
if the current working condition is matched with the heating working condition, starting a heating valve to gradually increase the measured temperature, and forbidding energy triggering to convert the measured temperature into the refrigeration working condition before reaching the refrigeration working condition conversion line;
and triggering to be converted to the refrigeration working condition and carrying out temperature regulation until the actually measured temperature reaches a preset refrigeration working condition conversion line.
3. The cigarette workshop process air conditioning working condition conversion control method according to claim 2, wherein when judging that the process air conditioning unit is currently applied to the central value control strategy, the control method further comprises:
if the current working condition is matched with a refrigeration working condition, starting a meter cooling valve to gradually reduce the measured temperature, and forbidding triggering and converting the measured temperature into a heating working condition before reaching a heating working condition conversion line;
and triggering to be converted to the heating working condition and carrying out temperature regulation until the actually measured temperature reaches a preset heating working condition conversion line.
4. The cigarette workshop process air conditioning working condition conversion control method according to claim 1, wherein when judging that the process air conditioning unit is currently applied to the central value control strategy, the control method comprises the following steps:
after the actually measured temperature reaches and deviates from the temperature set value, gradually reducing the opening of the valve corresponding to the current working condition according to the calculated value of the PID controller, and judging the temperature change trend after the valve stops acting;
if the change trend of the actually measured temperature is judged to be approaching to the temperature set value, the closing state of the valve is kept;
and if the change trend of the measured temperature is judged to be that the deviation degree of the measured temperature and the temperature set value is increased, forcibly triggering the working condition switching.
5. The cigarette workshop process air conditioner working condition conversion control method according to claim 4, wherein the temperature change trend judgment comprises:
setting a time window with a preset length, wherein the average value of the temperature values contained in the time window before and after sliding according to a preset distance is calculated for a set of a plurality of temperature values in the time window:
and determining the temperature change trend according to the change difference of the temperature average value.
6. The cigarette workshop process air conditioning working condition conversion control method according to claim 1, wherein when judging that the process air conditioning unit is currently applied to the variable temperature humidity control strategy, the control method specifically comprises the following steps:
setting a refrigerating working condition conversion line and a heating working condition conversion line according to historical data;
when the current measured temperature is between the refrigerating working condition conversion line and the heating working condition conversion line, limiting the output value of the PID controller, and enabling the temperature regulation target to dynamically change along with the measured temperature;
when the measured temperature rises to the refrigeration working condition conversion line T C2 Above, or below, the transition line T H2 And when the temperature is lower than the preset temperature, triggering and converting the temperature to a corresponding refrigerating working condition or a heating working condition, and calculating and adjusting the temperature through a PID controller.
7. The cigarette workshop process air conditioning working condition conversion control method according to claim 6, wherein when judging that the process air conditioning unit is currently applied to the variable temperature humidity control strategy, the control method further comprises the following steps:
periodically calculating the amplitude of the deviation of the measured temperature from the corresponding working condition conversion line in a preset time period in the process of increasing or decreasing the measured temperature;
and adjusting the corresponding working condition conversion line based on the amplitude.
8. The cigarette workshop process air conditioner working condition conversion control method according to claim 7, wherein the adjusting of the corresponding working condition conversion line comprises:
and combining a preset safety factor with the amplitude, and dynamically resetting a corresponding working condition conversion line on the basis of taking the overshoot as an adjustment basis.
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| CN202211401408.0A CN115857440A (en) | 2022-11-09 | 2022-11-09 | Method for controlling conversion of working conditions of process air conditioner in cigarette workshop |
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