SU1221244A1 - Automatic control system for process of yeast cultivation - Google Patents

Description

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The invention relates to automatic control systems for the cultivation of microorganisms and can be used, for example, in the production of yeast, in particular baking.

The aim of the invention is to improve the accuracy of control and optimization of the yeast cultivation process.

The drawing shows a structural diagram of an automatic control system for the cultivation of yeast.

The system contains control loops: the temperature of the supply medium in the fermenter, the temperature of the water supplied to the fermenter, the level in the fermenter, defoaming agent, air supply, the pH of the yeast suspension, and the supply of nutrient medium.

The temperature control loop in the fermenter consists of a direct action controller 1, a temperature sensor 2, a controller 3, and an actuator 4.

The control loop for the temperature of the water supplied to the fermenter includes a temperature sensor 5, a regulator 6 and an actuator 7.

The level control loop in the fermenter contains a level 8 gauge transducer, a transducer 9, a level adjuster 10, a regulating device 11, and an actuator 12.

The defoaming control loop consists of a defoamer sensor 13, a regulating device 14 connected to a converter 9, an actuator 15 and a valve 16.

The air supply control loop comprises an oxygen saturation sensor 17, a converter 18, a dial 19, a control 20, and an actuator 21.

The pH control loop includes a pH sensor 22, a converter 23, a setting device 24, a regulator 25 with a pulse signal supply system, and valves 2b and 27.

The nutrient control loop consists of sensors 28 and 29 of the cooling water inlet and outlet temperature and the ambient temperature sensor 30, subtraction unit 31, cooling water consumption sensor 32, output setpoint 33

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biomass, matching device 34, sensor 35, feed flow, regulating device 36 and actuating mechanism 37. Salt supply

5 is determined by drivers 38-40 and implemented by actuators 41-43.

The system works as follows.

10 At a temperature nominal to the enzymatic process, the set and supply of all components to the fermenter is carried out and the process of growing microorganisms, accompanied by heat generation and an increase in temperature in the fermenter, begins. If the temperature deviates from the setpoint, the temperature control circuit in the fermenter is activated, depending on this, the power supply is subsequently controlled according to the following scheme.

The direct action controller 1 maintains a constant in the system.

25 pressure, which eliminates the possibility of false indignation. Signal from sensor

2temperatury goes to the regulator

3 and then to the actuator 4. The sensor 32 cooling water flow

30 captures the obtained value and sends a signal to the matching device 34, which also receives a signal from the subtraction unit 3, in which the readings of the values of the cooling water outlet temperature sensor 29, the inlet water temperature sensor 28 and the ambient temperature sensor 30 are subtracted. The matching device 34 receives a signal from the biomass output adjuster 33. From the matching device 34, the signal is fed to the adjustable device 36 and from it to the executive mechanism 3 7.

 When a mismatch occurs on the device matching side 34, the actuator mechanism 37 provides power to the fermenter. Nutrient consumption (molasses)

 is regulated in direct proportion to the heat absorbed by the microorganisms, or the heat picked up by cooling water, taking into account the signal from the sensor 35

55 power consumption and feedback signal from the actuator 37. The regulating device 11 in the fermenter, depending on the state

35

40)

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the setpoint adjuster 10 and the true level determined by the pressure gauge sensor 8 Level and the transducer 9, sends a signal to the actuator 12. Water is fed to the feed through the water temperature control loop consisting of the temperature sensor 5, the regulator 6 and the actuator 7. At the same time, a signal is received from the converter 9 10 to the regulating device 14 and the actuator 15 to lower or raise the defroster sensor 13. When the foam touches the sensor 13, a signal arrives at the valve (5-16, which turns on for a few seconds. The defoaming sensor is always 1.2-1.5 m higher than the true level in the fermenter.

The air supply 20 is controlled by comparing the signals from sensor 17, converter 18 and setting unit 19, if there is a mismatch, the signal from regulator 20 is fed to actuator 25 21, which automatically adjusts the air supply to the fermenter.

The pH adjustment of the yeast suspension is also carried out 44

signals from the sensor 22, the converter 23. and the setter 24, in case of a mismatch, the signal, depending on the result of the comparison with the controller 25, enters the valve 26 or 27 and the farmer.enterter pulses, where with a certain interval, sulfuric acid or ammonia water flows .

Salts are set according to the program, depending on the air supply and

signals setters 38-40 actuators 41-43.

The proposed system is simple in design and can be implemented using automation. The use of the system allows to increase the yield of yeast due to the economical consumption of raw materials, since alcoholic fermentation is eliminated, and the nutrition is carried out according to the enzymatic process, i.e. on the heat release of microorganisms. When using the system, the consumption of oleic acid is reduced, the yield of yeast is increased, the consumption of drinking water from the city's water supply network is reduced due to the secondary use of water.

.VNIIPI Circulation 490

Order 1553/34 Subscription

Branch PPP Patent, Uzhgorod, Proektna St., 4

Claims (2)

1. SYSTEM OF AUTOMATIC CONTROL OF THE PROCESS OF YEAST CULTIVATION, containing circuits for regulating the supply of air, nutrient medium, cooling water, pH of the yeast suspension, temperature of the medium and air, characterized in that, in order to improve the accuracy of control and optimize the process of cultivation of yeast, the regulation of the supply of the nutrient medium is equipped with a subtraction unit, a matching device, temperature sensors installed respectively on the supply and removal lines of cooling water, a sensor ambient temperature, a cooling water flow sensor and a biomass output adjuster, while the sensors are connected through a subtraction unit and a matching device with actuators for supplying a nutrient medium. 2. The system according to claim 1, with the fact that it is equipped with a <£ level control circuit in the fermenter, consisting of a sensor and level switch, a converter connected via control devices to actuators, installed on the lines for the supply of antifoam and water entering the fermenter. • * 1