SU1446162A1 - Method of automatic control of fermentation process - Google Patents

Abstract

The invention relates to methods for automatically controlling the fermentation process, for example, growing yeast on n-paraffins, and can be used in the microbiological, pharmaceutical and food industries. The purpose of the invention is to increase the productivity of the fermenter in biomass due to an increase in the filling ratio. At the same time, the filling factor is determined by the level of the culture fluid in the ferro / that of the mentator, and the level of the fermenter is limited by the level of foam in the apparatus and the current of the agitator motor. The magnitudes of the mismatch between the current and the specified values of the foam level and the motor current of the agitator are determined and the level of the culture fluid in the fermenter is adjusted with correction for one of them or for the greatest of them. Unit 21 of the mode selection of the selector 17 provides manual switching of the selector in one of three modes of operation. The first mode, the selector 17, transmits a signal from the software setpoint 16j to the output, while the signal from the programming unit 20 is not passed. The second mode, the selector 17, transmits a signal from the software setpoint 20 to the output, and a signal from the software for the sensor 16 is not transmitted. The third mode - the selector 17 compares with each other the signals coming from the program setters 16 and 20, selects the smallest one and passes it to the output. 1 il. O) ze 1fd fyexatffae cyaieastei

Description

The invention relates to methods for automatically controlling a fermentation process, for example, growing yeast on n-paraffins, and can be used in microbiological, chemical, pharmaceutical and food industry.

The aim of the invention is to increase the productivity of the biomass fermenter.

The drawing shows a schematic diagram of an apparatus for implementing a method for automatically controlling a continuous fermentation process.

The fermenter 1 is supplied separated by fluxes via pipelines 2 and 3, respectively, nutrients and water for dilution. The yeast suspension is pumped out of the apparatus through pipeline 4.

The nutrient flow control circuit includes a nutrient flow sensor 5, a nutrient flow controller 6, and an actuator 7.

The flow control circuit of the yeast suspension taken from the fermenter contains a flow sensor 8 of the yeast suspension, a flow regulator 9 of the yeast suspension and an actuator 10.

The liquid level control circuit in the device contains a liquid level sensor 11, a liquid level controller 12 and an actuator 13.

A foam level sensor 14 is connected to a position regulator 15, which is connected to a software setting device 16, the output of which is connected to the first input of a smaller signal selector 17, the output of the latter is connected to the setting of a regulator 12. A stirrer current sensor 18 is connected to a position regulator a torus 19, which is connected to a software setter 20, the output of which is connected to the second input of the selector 1.7. smaller signal. The third input of the selector 17 is connected to the block 21 of the selection mode of operation of the selector 17.

The device works as follows.

The control loop containing sensor 5, Rehallor 6 and actuator 7, provides for the regulation of the flow of nutrients into the apparatus.

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The control loop, containing the sensor 8, the regulator 9 and the actuator 10, provides for the control of the flow rate of the yeast suspension withdrawn from the apparatus.

A control loop comprising a liquid level sensor 11, a regulator 12 and an actuator 13 provides for the regulation of the liquid level in the fermenter. The reference to the level controller 12 comes from the program setters 16 and 20 through the selector 17 of the smaller signal, which repeats the output of the smaller of the two input signals. The software control points 16 and 20 are controlled by position controllers 15 and 19, which adjust the level of the liquid level controller 12 depending on the foam level and the stirrer current respectively.

Unit 21 of the mode selection of the selector 17 provides manual switching of the selector in one of three modes of operation. In the first mode, the selector 17 transmits a signal from the software transmitter 16 to the output, while the signal from the software master 20 is not passed. In the first mode of operation, the selector provides liquid level control with a correction according to the magnitude of the mismatch between the current and predetermined values of the foam level. In the second mode, the selector 17 transmits a signal from the software setter 20 to the output, and a signal from the software setpoint 16 does not pass. In the second mode of operation, the selector 17 provides for the regulation of the liquid level with a correction by the magnitude of the mismatch between the current and the set values of the current level of the agitator motor. In the third mode, the selector 17 compares the signals coming from the program setters 16 and 20, selects the smallest one and passes it to the output .. In the third mode of operation, the selector 17. provides liquid level control with correction by the smallest of two values - the mismatch between current and set stump level values and the mismatch between the current and set values of the melter motor current.

In case with the help of block 21 the first operation mode is set.

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the selector 17, then at a change in, for example, an increase in the level of foam, at some point in time, the value of the signal from the sensor 14 becomes greater than a predetermined value (I-jc, ± 4) installed on the positional regulator 15, while is the signal M (less), which goes to the software setpoint 16. The signal at the output of the programming setpoint begins to decrease. This signal is fed to the first input of the selector 17, which repeats the signal from the setpoint 16. The output signal from the selector 17 goes to the input of the reference of the regulator 12, which means that it also begins to decrease. In this case, the actuator 13 begins to shrivel in the fermenter 1 and begins to decrease, which means that the level of the foam decreases until it reaches the set point (L backward t A).

In this case, at the output of the controller 15, the signal M is removed. The signal at the output of the program knob becomes constant, which means that a new constant smaller setting is set to the 12-level controller.

With a decrease in the foam level, the signal value from the sensor 14 becomes less than the set value (L д d ° of the regulator 15, a signal B appears (more), which goes to the program setpoint 16. At the same time, the signal at the output of the program setpoint begins to increase. This signal arrives at the first input of the selector 17, which increases the setting of controller 12. In this case, the actuator 13 begins to open the level in the fermenter begins to increase, which means that the level of foam increases until it becomes equal to nomu ()

By this, at the output of the controller 15, the signal B is removed. Signal on the output. The program setting point becomes constant, which means that a new permanent larger setting is set to the 12th level controller.

A change in the current of the agitator motor in the first mode of operation of the selector 17 does not have any influence on the operation of the fluid level controller 12.

If using block 21 manually set the second mode of operation of the selector 17, then when changing

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A scientific research institute, for example, an increase in the motor current of the agitator, which may be caused by an increase in the level of the fermenter, the signal value from sensor 18 becomes greater than the specified value (± d) on positioner 19, the output of regulator 19 is M setpoint 20. At the same time, the signal at the output of the programming setpoint begins to decrease. This signal goes to the second input of the selector 17, which reduces the setting of the controller 12. At the same time, the actuator 13 starts to close, decreases and therefore the motor current of the agitator decreases until it becomes equal to the set value (I-jaAi d). At the output of the regulator 19, the signal M is removed. The signal at the output of the program unit becomes constant, which means , a new constant lower setting is set to level 12 controller.

When the current of the agitator motor decreases, which may be caused by a decrease in the level in the fermenter, the signal value from sensor 18 becomes less than the set value (I d t. –D) at positioner 19, at the output of which signal B appears, which goes to software control unit 20. At the same time, the signal at the output of the software control unit begins to increase. This signal arrives at the second input of the selector 17, which increases the reference to the controller 12. At this, the actuator 13 starts to open, the level in the fermenter starts to increase, which means that the stirrer motor current increases until it reaches the set point (I ass t). At the same time, at the output of the controller 19, the signal o is removed. The signal at the output of the program knob becomes constant, which means that a new permanent higher reference is set to the 12th level controller.

The change in the level of foam in the fermenter in the second mode of operation of the selector 17 does not have any influence on the operation of the fluid level controller 12.

In case of using a block. 21, the third mode of operation of the selector is manually set;

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The engine foam current level of the agitator's engine receives two signals from the outputs of adjusters 16 and 20, respectively, to the selector input. In the selector 17, they are compared and the smallest of the signals is repeated at the output of block 21. Further operation of the device is carried out similarly as described in the first key for the second mode of operation of the selector.

Claims (1)

The invention The method of automatic control of the fermentation process, which consists of 15 in regulating the supply of nutrients, the selection of yeast: seed suspension and the level of culture liquid according to 1626 water metering, foam level measurement and motor current of the agitator, in order to improve performance; of the fermentor by biomass due to an increase in the fill factor, the magnitude of the mismatch between the current and predetermined values of the foam level, the mismatch between the current and the specified toKa values of the agitator engine are compared, the obtained and normalized mismatch values are compared, and the level of the culture fluid is compared with a correction for one of them or with a correction for the largest of them.