CN112790421B - A method for controlling the moisture content at the feed outlet of cut stems based on sliding window prediction - Google Patents
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Abstract
本发明提供一种基于滑窗预测的梗丝加料出口含水率的控制方法，包括：获取梗丝加料的增湿水量，并以设定时间段内的N次采集作为一个滑窗来计算梗丝的平均出口含水率。根据所述增湿水量和所述平均出口含水率的变化趋势来确定增湿水比例和出口含水率的第一滑窗预测模型。获取当前生产梗丝加料的出口含水率的目标值，并通过所述第一滑窗预测模型对达到所述目标值需要的增湿水比例进行前馈控制。本发明能解决现有梗丝加料的出口含水率存在滞后性，易造成不准确的问题，能提高各批次梗丝的出口含水率的一致性，提升生产过程质量控制能力。
The invention provides a method for controlling the moisture content of cut cut stems feeding outlet based on sliding window prediction. The average outlet moisture content. A first sliding window prediction model for the humidification water ratio and the outlet moisture content is determined according to the change trend of the humidification water amount and the average outlet moisture content. The target value of the outlet moisture content of the currently produced cut cut stems is obtained, and the first sliding window prediction model is used to perform feedforward control on the proportion of humidification water required to achieve the target value. The invention can solve the problem of hysteresis and inaccuracy in the outlet moisture content of the existing cut cut stems, and can improve the consistency of the outlet moisture content of each batch of cut cut stems and improve the quality control capability of the production process.
Description
技术领域technical field
本发明涉及烟丝加工控制技术领域，尤其涉及一种基于滑窗预测的梗丝加料出口含水率的控制方法。The invention relates to the technical field of cut tobacco processing control, in particular to a method for controlling the moisture content at the feed outlet of cut stems based on sliding window prediction.
背景技术Background technique
梗丝是卷烟配方中的重要组成成分之一，其主要用于提高烟丝的填充值，起到降低卷烟焦油的作用。因此，提升梗丝品质和使用率能够有效降低卷烟制品的焦油量和卷烟制品的成本。目前常用的梗丝制备工艺流程，通常首先对烟梗进行回潮预处理，之后压梗、切梗以使烟梗形态发生变化，再进行梗丝加料及增温增湿，最后进行梗丝干燥脱水，实现梗丝的制备。Cut stems are one of the important components in cigarette formulations, which are mainly used to increase the filling value of cut tobacco and reduce cigarette tar. Therefore, improving the quality and utilization rate of cut stems can effectively reduce the tar content of cigarette products and the cost of cigarette products. At present, the commonly used production process of cut stems is usually first to pre-moisten the tobacco stems, then press the stems and cut the stems to change the shape of the tobacco stems, then add the cut stems and heat and humidify them, and finally dry and dehydrate the cut stems. , to achieve the preparation of cut stems.
梗丝加料是按配方要求将料液施加到梗丝上，通过加料工艺处理降低烟草的刺激性、杂气，改善烟草的感官质量和物理特性。梗丝加料控制是在生产过程中由加料系统根据梗丝流量及加料比例将料液施加至梗丝上，其中料液可通过喷嘴与蒸汽混合喷洒。目前通常根据梗丝出口含水率进行蒸汽压力和增湿比例来调整，这种方式对实际调节出口含水率具有很大的滞后性，不利于各批次梗丝加料的出口含水率和温度的稳定性控制。Cut stem feeding is to apply feed liquid to cut stems according to the formula requirements, and through the feeding process, the irritation and miscellaneous gas of tobacco are reduced, and the sensory quality and physical properties of tobacco are improved. Cut stem feeding control is that during the production process, the feed system applies the feed liquid to the cut stems according to the flow rate of cut stems and the feeding ratio, and the feed liquid can be mixed and sprayed with steam through the nozzle. At present, the steam pressure and humidification ratio are usually adjusted according to the outlet moisture content of cut stems. This method has a great hysteresis for the actual adjustment of the outlet moisture content, which is not conducive to the stability of the outlet moisture content and temperature of each batch of cut stems. Sexual control.
发明内容SUMMARY OF THE INVENTION
本发明提供一种基于滑窗预测的梗丝加料出口含水率的控制方法，解决现有梗丝加料的出口含水率存在滞后性，易造成不准确的问题，能提高各批次梗丝的出口含水率的一致性，提升生产过程质量控制能力。The invention provides a method for controlling the moisture content of cut stem feeding outlet based on sliding window prediction, which solves the problem of hysteresis in the outlet moisture content of the existing cut stem feeding, which is easy to cause inaccuracy, and can improve the output of each batch of cut stems. The consistency of moisture content improves the quality control ability of the production process.
为实现以上目的，本发明提供以下技术方案：For achieving the above purpose, the present invention provides the following technical solutions:
一种基于滑窗预测的梗丝加料出口含水率的控制方法，包括：A method for controlling the moisture content at the feed outlet of cut cut stems based on sliding window prediction, comprising:
获取梗丝加料的增湿水量，并以设定时间段内的N次采集作为一个滑窗来计算梗丝的平均出口含水率；Obtain the moisturizing water volume of cut cut stems, and calculate the average outlet moisture content of cut cut stems by taking N collections within a set time period as a sliding window;
根据所述增湿水量和所述平均出口含水率的变化趋势来确定增湿水比例和出口含水率的第一滑窗预测模型；Determine the first sliding window prediction model of the humidification water ratio and the outlet moisture content according to the changing trend of the humidification water amount and the average outlet moisture content;
获取当前生产梗丝加料的出口含水率的目标值，并通过所述第一滑窗预测模型对达到所述目标值需要的增湿水比例进行前馈控制。The target value of the outlet moisture content of the currently produced cut cut stems is obtained, and the first sliding window prediction model is used to perform feedforward control on the proportion of humidification water required to achieve the target value.
优选的，还包括：Preferably, it also includes:
获取梗丝加料的蒸汽压力，并根据所述蒸汽压力和所述平均出口含水率的变化趋势来确定蒸汽阀门开度和出口含水率的第二滑窗预测模型；Obtaining the steam pressure of cut stem feeding, and determining the second sliding window prediction model of steam valve opening and outlet water content according to the changing trend of the steam pressure and the average outlet water content;
在所述增湿水量恒定时，通过所述第二滑窗预测模型对达到所述目标值所需要的蒸汽阀门开度进行前馈控制。When the amount of humidified water is constant, feedforward control is performed on the opening degree of the steam valve required to achieve the target value through the second sliding window prediction model.
优选的，还包括：Preferably, it also includes:
获取梗丝加料的出口含水率的实测值，并根据所述目标值和所述实测值得到出口含水率的目标偏差值；Obtain the measured value of the outlet water content of cut stem feeding, and obtain the target deviation value of the outlet water content according to the target value and the measured value;
建立PID反馈控制模型，用于根据所述目标偏差值调节增湿水比例以对出口含水率进行反馈控制。A PID feedback control model is established for adjusting the humidification water ratio according to the target deviation value to feedback control the outlet moisture content.
优选的，还包括：Preferably, it also includes:
建立所述出口含水率的EWMA反馈控制模型，并根据所述EWMA反馈控制模型对所述出口含水率进行指数加权移动平均运算，得到EWMA统计量ZS；Establishing the EWMA feedback control model of the outlet water content, and performing exponentially weighted moving average operation on the outlet water content according to the EWMA feedback control model to obtain the EWMA statistic Z S ;
根据所述EWMA统计量ZS对增湿水比例进行反馈控制，使出口含水率的波动减小。According to the EWMA statistic Z S , feedback control is performed on the humidification water ratio, so that the fluctuation of the outlet moisture content is reduced.
优选的，所述EWMA统计量ZS根据以下公式计算：Preferably, the EWMA statistic Z S is calculated according to the following formula:
ZS＝λ·yS+(1-λ)ZS-1，其中，Z0＝T，λ＝2，yS为第S个时刻的出口含水率。Z S =λ·y S +(1-λ)Z S-1 , where Z 0 =T, λ=2, and y S is the outlet water content at the S-th moment.
优选的，还包括：Preferably, it also includes:
获取梗丝加料的蒸汽温度，并根据所述蒸汽温度和所述平均出口含水率的变化趋势来确定蒸汽温度和出口含水率的第三滑窗预测模型；Obtaining the steam temperature of cut stem feeding, and determining the third sliding window prediction model of steam temperature and outlet water content according to the changing trend of the steam temperature and the average outlet water content;
通过所述第三滑窗预测模型对达到所述目标值所需要的所述蒸汽温度进行前馈控制。Feedforward control is performed on the steam temperature required to reach the target value through the third sliding window prediction model.
优选的，所述根据所述增湿水量和所述平均出口含水率的变化趋势来确定增湿水比例和出口含水率的第一滑窗预测模型，包括：Preferably, the first sliding window prediction model for determining the humidification water ratio and the outlet moisture content according to the changing trend of the humidification water amount and the average outlet moisture content includes:
建立一个包括当前时刻在内的n次采样的出口含水率滑窗，并计算得到各个时刻的出口含水率与所述平均含水率的差值；Establish a sliding window of outlet water content for n times of sampling including the current moment, and calculate the difference between the outlet water content at each moment and the average water content;
如果一个滑窗内的所有时刻所对应的差值都大于或小于0，则判断出口含水率出现了整体性的增大趋势或减小趋势；If the difference corresponding to all the times in a sliding window is greater or less than 0, it is judged that the outlet water content has an overall increasing trend or a decreasing trend;
获取滑窗第一个时刻所对应的出口时刻，并在所述增大趋势或所述减小趋势时控制增湿水阀在所述出口时刻开始减小开度或增大开度，以对出口含水率进行预测。Obtain the outlet moment corresponding to the first moment of the sliding window, and control the humidifying water valve to decrease or increase the opening degree at the outlet moment when the increasing trend or the decreasing trend is present, so as to improve the The outlet moisture content is predicted.
优选的，所述根据所述蒸汽压力和所述平均出口含水率的变化趋势来确定蒸汽阀门开度和出口含水率的第二滑窗预测模型，包括：Preferably, the second sliding window prediction model for determining the opening degree of the steam valve and the outlet water content according to the change trend of the steam pressure and the average outlet water content includes:
建立一个包括当前时刻在内的n次采样的蒸汽压力滑窗，并计算得到各个时刻蒸汽压力所对应的出口含水率与所述平均含水率的差值；Establish a steam pressure sliding window for n samples including the current time, and calculate the difference between the outlet water content corresponding to the steam pressure at each time and the average water content;
如果一个滑窗内的所有时刻所对应的差值都大于或小于0，则判断出口含水率出现了整体性的增大趋势或减小趋势；If the difference corresponding to all the times in a sliding window is greater or less than 0, it is judged that the outlet water content has an overall increasing trend or a decreasing trend;
获取滑窗第一个时刻所对应的出口时刻，并在所述增大趋势或所述减小趋势时控制蒸汽阀门在所述出口时刻开始减小开度或增大开度，以控制出口含水率。Obtain the outlet moment corresponding to the first moment of the sliding window, and control the steam valve to decrease or increase the opening degree at the outlet moment when the increasing trend or the decreasing trend is present, so as to control the water content at the outlet Rate.
优选的，所述根据所述蒸汽温度和所述平均出口含水率的变化趋势来确定蒸汽温度和出口含水率的第三滑窗预测模型，包括：Preferably, the third sliding window prediction model for determining the steam temperature and the outlet water content according to the change trend of the steam temperature and the average outlet water content includes:
建立一个包括当前时刻在内的n次采样的蒸汽温度滑窗，并计算得到各个时刻蒸汽温度所对应的出口含水率与所述平均含水率的差值；Establish a steam temperature sliding window for n samples including the current time, and calculate the difference between the outlet water content corresponding to the steam temperature at each time and the average water content;
如果一个滑窗内的所有时刻所对应的差值都大于或小于0，则判断出口含水率出现了整体性的增大趋势或减小趋势；If the difference corresponding to all the times in a sliding window is greater or less than 0, it is judged that the outlet water content has an overall increasing trend or a decreasing trend;
获取滑窗第一个时刻所对应的出口时刻，并在所述增大趋势或所述减小趋势时控制蒸汽温度在所述出口时刻开始减小或增大，以控制出口含水率。The outlet moment corresponding to the first moment of the sliding window is obtained, and when the increasing trend or the decreasing trend is present, the steam temperature is controlled to start decreasing or increasing at the outlet moment, so as to control the outlet moisture content.
本发明提供一种基于滑窗预测的梗丝加料出口含水率的控制方法，通过设置滑窗预测模型，并基于出水口含水率对增湿水比例进行前馈控制，解决现有梗丝加料的出口含水率存在滞后性，易造成不准确的问题，能提高各批次梗丝的出口含水率的一致性，提升生产过程质量控制能力。The invention provides a method for controlling the moisture content of cut stem feeding outlet based on sliding window prediction. By setting a sliding window prediction model, and based on the water content of the water outlet, the proportion of humidification water is feedforward controlled, so as to solve the problem of existing cut stem feeding. There is a hysteresis in the outlet moisture content, which is easy to cause inaccuracy. It can improve the consistency of the outlet moisture content of each batch of cut stems and improve the quality control ability of the production process.
附图说明Description of drawings
为了更清楚地说明本发明的具体实施例，下面将对实施例中所需要使用的附图作简单地介绍。In order to illustrate the specific embodiments of the present invention more clearly, the accompanying drawings required in the embodiments will be briefly introduced below.
图1是本发明提供的一种基于滑窗预测的梗丝加料出口含水率的控制方法示意图。Fig. 1 is a schematic diagram of a method for controlling the moisture content at the feed outlet of cut stems based on sliding window prediction provided by the present invention.
图2是本发明提供的梗丝加料出口含水率的PID反馈控制的示意图。Fig. 2 is a schematic diagram of the PID feedback control of the moisture content at the feed outlet of cut stems provided by the present invention.
具体实施方式Detailed ways
为了使本技术领域的人员更好地理解本发明实施例的方案，下面结合附图和实施方式对本发明实施例作进一步的详细说明。In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
针对当前梗丝加料工序中对于出口含水率的控制存在滞后性的问题。本发明提供一种基于滑窗预测的梗丝加料出口含水率的控制方法，通过设置滑窗预测模型，并基于出水口含水率对增湿水比例进行前馈控制，解决现有梗丝加料的出口含水率存在滞后性，易造成不准确的问题，能提高各批次梗丝的出口含水率的一致性，提升生产过程质量控制能力。There is a hysteresis problem in the control of outlet moisture content in the current cut stem feeding process. The invention provides a method for controlling the moisture content of cut stem feeding outlet based on sliding window prediction. By setting a sliding window prediction model, and based on the water content of the water outlet, the proportion of humidification water is feedforward controlled, so as to solve the problem of existing cut stem feeding. There is a hysteresis in the outlet moisture content, which is easy to cause inaccuracy. It can improve the consistency of the outlet moisture content of each batch of cut stems and improve the quality control ability of the production process.
如图1所示，一种基于滑窗预测的梗丝加料出口含水率的控制方法，包括：As shown in Figure 1, a method for controlling the moisture content of cut stem feeding outlet based on sliding window prediction includes:
S1：获取梗丝加料的增湿水量，并以设定时间段内的N次采集作为一个滑窗来计算梗丝的平均出口含水率。S1: Obtain the moisturizing water amount of cut cut stems, and calculate the average outlet moisture content of cut cut stems by taking N times of collection within a set time period as a sliding window.
S2：根据所述增湿水量和所述平均出口含水率的变化趋势来确定增湿水比例和出口含水率的第一滑窗预测模型。S2: Determine the first sliding window prediction model of the humidification water ratio and the outlet moisture content according to the change trend of the humidification water amount and the average outlet moisture content.
S3：获取当前生产梗丝加料的出口含水率的目标值，并通过所述第一滑窗预测模型对达到所述目标值需要的增湿水比例进行前馈控制。S3: Obtain the target value of the outlet moisture content of the current production cut cut stems, and perform feedforward control on the humidification water ratio required to achieve the target value through the first sliding window prediction model.
进一步，所述根据所述增湿水量和所述平均出口含水率的变化趋势来确定增湿水比例和出口含水率的第一滑窗预测模型，包括：Further, the first sliding window prediction model for determining the humidification water ratio and the outlet moisture content according to the change trend of the humidification water amount and the average outlet moisture content includes:
建立一个包括当前时刻在内的n次采样的出口含水率滑窗，并计算得到各个时刻的出口含水率与所述平均含水率的差值。A sliding window of outlet water content of n samples including the current time is established, and the difference between the outlet water content at each time and the average water content is calculated.
如果一个滑窗内的所有时刻所对应的差值都大于或小于0，则判断出口含水率出现了整体性的增大趋势或减小趋势。If the difference corresponding to all the times in a sliding window is greater or less than 0, it is judged that the outlet water content has an overall increasing trend or a decreasing trend.
获取滑窗第一个时刻所对应的出口时刻，并在所述增大趋势或所述减小趋势时控制增湿水阀在所述出口时刻开始减小开度或增大开度，以对出口含水率进行预测。Obtain the outlet moment corresponding to the first moment of the sliding window, and control the humidifying water valve to decrease or increase the opening degree at the outlet moment when the increasing trend or the decreasing trend is present, so as to improve the The outlet moisture content is predicted.
具体地，为了区分和识别梗丝的出口含水率的整体趋势性变化，可采用移动滑窗的方法进行监测。首先，设当前时刻为t，为了确定当前增湿水量，可采用近一段时间的前N次采样作为一个滑窗来计算平均出口含水率
其中，xi表示第i个时刻的出口含水率。随着生产过程的继续，这个滑窗向前滑动，于是下一时刻时的平均含水率为
其次，为了识别入口含水率的趋势性变化，可再建立一个包括n次采样的滑窗，同样设当前时刻为t，分别计算包括当前时刻在内的n次采样的出口含水率与平均出口含水率的差dj＝xj-μj；j＝t,t-1,…t-n+1。为了避免偶然性变化的影响，识别趋势性的出口含水率的变化，可设置过程质量控制判异准则。Secondly, in order to identify the trend change of the inlet water content, a sliding window including n times of sampling can be established, and the current time is also set as t, and the outlet water content and the average outlet water content of n times of sampling including the current time are calculated respectively. The rate difference d j = x j - μ j ; j = t, t-1, . . . t-n+1. In order to avoid the influence of accidental changes and identify the trend of changes in outlet water content, process quality control discrimination criteria can be set.
该方法通过滑窗预测对增湿水比例进行前馈控制，使梗丝加料工序中对增湿水进行精确控制，使批次内的梗丝的出口含水率的一致性得到提高，不需要在检测到出口含水率后才能对增湿水比例进行调整，能提升生产过程质量控制能力。In this method, the proportion of humidified water is feedforward controlled by sliding window prediction, so that the humidified water can be accurately controlled in the cutting cuttings feeding process, and the consistency of the outlet moisture content of cut cuttings in a batch can be improved, and it is not necessary to The proportion of humidifying water can be adjusted only after the moisture content of the outlet is detected, which can improve the quality control ability of the production process.
如图1所示，该方法还包括：As shown in Figure 1, the method further includes:
S4：获取梗丝加料的蒸汽压力，并根据所述蒸汽压力和所述平均出口含水率的变化趋势来确定蒸汽阀门开度和出口含水率的第二滑窗预测模型；S4: obtain the steam pressure of cut stem feeding, and determine the second sliding window prediction model of steam valve opening and outlet water content according to the change trend of the steam pressure and the average outlet water content;
S5：在所述增湿水量恒定时，通过所述第二滑窗预测模型对达到所述目标值所需要的蒸汽阀门开度进行前馈控制。S5: When the amount of humidifying water is constant, perform feedforward control on the opening degree of the steam valve required to achieve the target value by using the second sliding window prediction model.
进一步，所述根据所述蒸汽压力和所述平均出口含水率的变化趋势来确定蒸汽阀门开度和出口含水率的第二滑窗预测模型，包括：Further, the second sliding window prediction model for determining the opening degree of the steam valve and the outlet water content according to the change trend of the steam pressure and the average outlet water content includes:
建立一个包括当前时刻在内的n次采样的蒸汽压力滑窗，并计算得到各个时刻蒸汽压力所对应的出口含水率与所述平均含水率的差值；Establish a steam pressure sliding window for n samples including the current time, and calculate the difference between the outlet water content corresponding to the steam pressure at each time and the average water content;
如果一个滑窗内的所有时刻所对应的差值都大于或小于0，则判断出口含水率出现了整体性的增大趋势或减小趋势；If the difference corresponding to all the times in a sliding window is greater or less than 0, it is judged that the outlet water content has an overall increasing trend or a decreasing trend;
获取滑窗第一个时刻所对应的出口时刻，并在所述增大趋势或所述减小趋势时控制蒸汽阀门在所述出口时刻开始减小开度或增大开度，以控制出口含水率。Obtain the outlet moment corresponding to the first moment of the sliding window, and control the steam valve to decrease or increase the opening degree at the outlet moment when the increasing trend or the decreasing trend is present, so as to control the water content at the outlet Rate.
如图2所示，该方法还包括：As shown in Figure 2, the method further includes:
S6：获取梗丝加料的出口含水率的实测值，并根据所述目标值和所述实测值得到出口含水率的目标偏差值；S6: Obtain the measured value of the outlet moisture content of cut stem feeding, and obtain the target deviation value of the outlet moisture content according to the target value and the measured value;
S7：建立PID反馈控制模型，用于根据所述目标偏差值调节增湿水比例以对出口含水率进行反馈控制。S7: Establish a PID feedback control model for adjusting the humidification water ratio according to the target deviation value to perform feedback control on the outlet moisture content.
在实际应用中，通过PID反馈控制模型对出口含水率进行实时调整，将出口含水率的实测值与目标值进行比对，然后根据目标偏差值作为PID反馈控制模型的输入，并根据输入的料液喷射量进行自适应学习，进而确定调节P、I和D的参数取值，以实现出口含水率的控制，提高批次内出口含水率控制的稳定性，增加批次间控制的一致性。In practical applications, the outlet water content is adjusted in real time through the PID feedback control model, the measured value of the outlet water content is compared with the target value, and then the target deviation value is used as the input of the PID feedback control model, and according to the input material The liquid injection amount is adaptively learned, and then the parameter values for adjusting P, I and D are determined to realize the control of the outlet water content, improve the stability of the control of the outlet water content within a batch, and increase the consistency of the control between batches.
为了更好地对梗丝的出口含水率进行有效控制，还应该根据其变化情况及时进行修正调整。已有的PID反馈控制系统能够对出口含水率的轻微变化进行调整，但对于较大的过程波动往往难以及时实现有效控制，很多时候都需要操作人员进行人工干预，这既增加了人员的工作强度，也由于操作人员的经验差异造成批次质量稳定性下降，为此可采用计算机来实现出口含水率变化的自动识别和调整。为了提高识别过程出现趋势性偏移的灵敏性，同时避免个别检测结果异常造成的干扰，可运用EWMA进行控制系统的算法设计。In order to effectively control the outlet moisture content of cut stems, it should also be corrected and adjusted in time according to its changes. The existing PID feedback control system can adjust the slight change of the water content at the outlet, but it is often difficult to realize effective control in time for large process fluctuations. In many cases, manual intervention by the operator is required, which not only increases the work intensity of the personnel , and also due to the difference in the experience of the operators, the stability of the batch quality is reduced. For this reason, the computer can be used to realize the automatic identification and adjustment of the change of the moisture content of the outlet. In order to improve the sensitivity of the trend deviation in the identification process and avoid the interference caused by abnormal individual detection results, EWMA can be used to design the algorithm of the control system.
该方法还包括：The method also includes:
S8：建立所述出口含水率的EWMA反馈控制模型，并根据所述EWMA反馈控制模型对所述出口含水率进行指数加权移动平均运算，得到EWMA统计量ZS；在
进一步，所述EWMA统计量ZS根据以下公式计算：Further, the EWMA statistic Z S is calculated according to the following formula:
ZS＝λ·yS+(1-λ)ZS-1，其中，Z0＝T，λ＝2，yS为第S个时刻的出口含水率。Z S =λ·y S +(1-λ)Z S-1 , where Z 0 =T, λ=2, and y S is the outlet water content at the S-th moment.
该方法还包括：The method also includes:
S9：获取梗丝加料的蒸汽温度，并根据所述蒸汽温度和所述平均出口含水率的变化趋势来确定蒸汽温度和出口含水率的第三滑窗预测模型。S9: Obtain the steam temperature of the cut stems feeding, and determine the third sliding window prediction model of the steam temperature and the outlet water content according to the change trend of the steam temperature and the average outlet water content.
S10：通过所述第三滑窗预测模型对达到所述目标值所需要的所述蒸汽温度进行前馈控制。S10: Perform feedforward control on the steam temperature required to reach the target value through the third sliding window prediction model.
进一步，所述根据所述蒸汽温度和所述平均出口含水率的变化趋势来确定蒸汽温度和出口含水率的第三滑窗预测模型，包括：Further, the third sliding window prediction model for determining the steam temperature and the outlet water content according to the changing trend of the steam temperature and the average outlet water content includes:
建立一个包括当前时刻在内的n次采样的蒸汽温度滑窗，并计算得到各个时刻蒸汽温度所对应的出口含水率与所述平均含水率的差值。Establish a steam temperature sliding window for n samples including the current time, and calculate the difference between the outlet water content corresponding to the steam temperature at each time and the average water content.
如果一个滑窗内的所有时刻所对应的差值都大于或小于0，则判断出口含水率出现了整体性的增大趋势或减小趋势。If the difference corresponding to all the times in a sliding window is greater or less than 0, it is judged that the outlet water content has an overall increasing trend or a decreasing trend.
获取滑窗第一个时刻所对应的出口时刻，并在所述增大趋势或所述减小趋势时控制蒸汽温度在所述出口时刻开始减小或增大，以控制出口含水率。The outlet moment corresponding to the first moment of the sliding window is obtained, and when the increasing trend or the decreasing trend is present, the steam temperature is controlled to start decreasing or increasing at the outlet moment, so as to control the outlet moisture content.
在实际应用中，梗丝由振动输送机送入加料机滚筒内，滚筒由传动装置带动旋转，使得梗丝自动地向出料口方向流动。当梗丝运行时通过管路对梗丝进行料液喷射。在蒸汽压力的作用下，料液和蒸汽混合后呈雾状喷射出并洒落到梗丝上。在梗丝加料工序中，对出口含水率可以通过热风温度、循环风量和料液蒸汽喷射量等几方面进行影响和控制。为了避免多个影响因素同时作用造成生产过程的不稳定，可将其中的多个影响变量分别固定在一个适当的取值，仅调整其中的一个影响因素来对出口含水率进行控制。In practical application, the cut stems are fed into the drum of the feeder by the vibrating conveyor, and the drum is driven to rotate by the transmission device, so that the cut stems automatically flow toward the discharge port. When the cut stems are running, the cut stems are sprayed with feed liquid through the pipeline. Under the action of steam pressure, the feed liquid and steam are mixed and sprayed out in the form of a mist and sprinkled on the cut stems. In the feeding process of cut stems, the outlet moisture content can be influenced and controlled by the hot air temperature, circulating air volume and feed liquid vapor injection volume. In order to avoid the instability of the production process caused by the simultaneous action of multiple influencing factors, multiple influencing variables can be fixed at an appropriate value respectively, and only one of the influencing factors can be adjusted to control the outlet moisture content.
可见，本发明提供一种基于滑窗预测的梗丝加料出口含水率的控制方法，通过设置滑窗预测模型，并基于出水口含水率对增湿水比例进行前馈控制，解决现有梗丝加料的出口含水率存在滞后性，易造成不准确的问题，能提高各批次梗丝的出口含水率的一致性，提升生产过程质量控制能力。It can be seen that the present invention provides a method for controlling the moisture content of cut stems at the feed outlet based on sliding window prediction. By setting a sliding window prediction model, and based on the moisture content of the water outlet, feedforward control is performed on the proportion of humidified water, so as to solve the problem of existing cut stems. There is a hysteresis in the outlet moisture content of feeding, which is easy to cause inaccuracy. It can improve the consistency of the outlet moisture content of each batch of cut stems and improve the quality control ability of the production process.
以上依据图示所示的实施例详细说明了本发明的构造、特征及作用效果，以上所述仅为本发明的较佳实施例，但本发明不以图面所示限定实施范围，凡是依照本发明的构想所作的改变，或修改为等同变化的等效实施例，仍未超出说明书与图示所涵盖的精神时，均应在本发明的保护范围内。The structure, features and effects of the present invention have been described in detail above according to the embodiments shown in the drawings. The above descriptions are only the preferred embodiments of the present invention, but the scope of the present invention is not limited by the drawings. Changes made to the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, shall fall within the protection scope of the present invention as long as they do not exceed the spirit covered by the description and drawings.
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