Online control method of residual sugar concentration in fermentation process
A fermentation process and residual sugar technology, applied in the field of application engineering, can solve the problems of difficulty in popularization and application, vagueness, and narrow application.
Active Publication Date: 2016-11-23
JIANGNAN UNIV
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[0003] The object of the present invention is to provide a kind of fuzzy control strategy in order to overcome the shortcomings such as relatively large hysteresis in the detection of residual sugar concentration in the existing fermentation process, and the control strategy based on expert experience relies on expert experience, narrow applicable range and difficult to popularize and apply. It is used to summarize expert experience and deduce it into a general formula expression, providing a new path for the control of residual sugar concentration in the fermentation process
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[0017] Attached below figure 1 The structure of the present invention is further described.
[0018] Such as figure 1 As shown, the thick solid line is the pipeline, the thin solid line is the communication line, and the arrow indicates the transmission direction of the signal or liquid. The equipment involved in the present invention includes: constant flow pump 1 (TBP1010), constant flow pump 2 (TBP1002), online sugar concentration analyzer (YSI2700), fermenter, peristaltic pump, mixer (dilution), PC. The constant flow pump 1 extracts the reaction liquid from the fermentation tank through the pipeline, and the constant flow pump 2 is connected to pure water. The two liquids are fully mixed and diluted in the mixer according to a certain ratio, and sent to the online sugar concentration analyzer for online detection. At the same time, The liquid in the mixer overflows, and the detection value is sent to the PC through the communication line. After algorithm control, the o...
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The invention relates to an online control method of residual sugar concentration in a fermentation process. According to problems, such as the problem of large lag in online detection of residual sugar concentration in a fermentation process, an expert knowledge method is expanded, and a fuzzy control method is adopted to simulate the expert knowledge method, and therefore, a sugar concentration real-time control method is provided. According to the control method, expert experience-based fuzzy control simulation is carried out through the following steps that: residual sugar concentration in a tank and the change rate of the residual sugar concentration are adopted as the input of fuzzy control, and a sugar supplementing rate is adopted as output; the input and output linguistic variables of a model controller are determined, so that a domain of discourse and a control method can be determined; a quantization factor and a scaling factor are obtained; the membership functions of the input and output of the model controller are provided; the fuzzy control rules of the model controller are obtained; and a clearness algorithm is adopted. When the method is used on line, a computer controls a constant flow pump to extract fermentation liquid and dilute the fermentation liquid, and then controls a YSI2700 online analyzer to carry out analysis; and a lag detection value is introduced into a designed fuzzy controller, and a sugar supplementing rate in a control period can be obtained. With the method adopted, the expert knowledge method is optimized, and the universality of the expert knowledge method is expanded, and therefore, the quality and yield of products in the fermentation process can be greatly improved.
Description
technical field [0001] The invention belongs to the field of application engineering, in particular to an on-line control method for residual sugar concentration in a fermentation process using a hysteresis detection value. Background technique [0002] In the fermentation process, sugar is usually used as a nutrient for bacterial growth, and its concentration directly determines the quality and yield of the product. If the sugar concentration is too low, the bacteria will be in a state of insufficient nutrition, and the growth will be slow; if the sugar concentration is too high, the growth of the bacteria will also be inhibited due to excess nutrition. Limited by the development of detection technology, the traditional method of off-line sampling and analysis is mostly used in the detection of sugar concentration at present, which has a long detection cycle and a long lag time. The residual sugar concentration control based on this detection technology is relatively exten...
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Inventor 赵忠盖刘辉徐俭李庆华刘飞石贵阳
Owner JIANGNAN UNIV