RU1805459C - Device for adjusting temperature in fermenter - Google Patents

Abstract

The invention relates to chemical and biochemical technology, can be used in apparatuses cooled by water using a jacket or an integrated heat exchanger. The purpose of the invention is to improve the accuracy of the device. To achieve the goal, the device comprises a sensor 1 and a setter 2 for the temperature of the culture medium in the fermenter 3, a sensor 4 and a setter 5 for cooling water temperature at the outlet of the fermenter, the first 6 and second 7 comparison elements, a three-position relay block 8, a two-position relay block 11, the first relay time with a winding 17, a second time relay with a winding 13, a third time relay with a winding 14 with corresponding make and break contacts, actuator 16. Improving the accuracy of the device is achieved by reducing The number of run-offs of an object parameter at predetermined boundaries due to the fact that a preliminary effect on the temperature of the cooling water is carried out. 1 ill.

Description

21 f

00

o eat Јw eat u

The invention relates to chemical and biochemical techniques and can be used in water cooled fermenters using a jacket or an integrated heat exchanger.

The purpose of the invention is to improve the accuracy of the device by reducing the temperature deviation downward for a given value,

The inventive device is characterized by the presence of new units: a sensor and a setpoint for cooling water temperature at the outlet of the fermenter, a two-position relay unit, a second and third time relay, and their connections with the elements of the device.

The drawing shows a diagram of a device for controlling temperature.

A device for controlling the temperature in the fermenter comprises a sensor 1 and a temperature setter 2 for the culture medium in the fermenter 3, a sensor 4 and a temperature setter 5 for the cooling water at the outlet of the fermenter. The outputs of the sensor 1 and the setter 2 are connected to the inputs of the first comparison element 6, the outputs of the sensor 4 and the setter 5 are connected to the inputs of the second comparison element 7. The output of the first comparison element 6 is connected to the input of the three-position relay block 8, which has two make contacts 9 and 10 One make contact 9 is closed if the temperature of the medium lags behind the set value set on the control unit 2 by no more than the value of the deadband b. Another make contact 10 is closed if the temperature exceeds the set value. The output of the second comparison element 7 is connected to the input of the on-off relay unit 11 having a make contact 12, which is closed when the water at the outlet of the fermenter is heated to a temperature close to the temperature of the medium. The winding 17 of the first time relay is connected to the power source through one of the make contacts 9 of the three-position relay block 8 and the make contact 18 of the second time relay, as well as through the other make contact 10 of the three-position relay unit 8, make contact 20 and the make contact d8 second time relay. The actuator 16 is connected to the power source through a series-connected make contact 15 of the third time relay and another make contact 10 of the three-position relay unit 8. The winding 13 of the second time relay is connected to the power supply through another make contact 10 of the three-position relay unit 8. The winding 14 of the third time relay is connected to the power supply via series-connected make contact 12

a two-position relay block 11 and another make contact 10 of a three-position relay block 8. The circuit is powered by two terminals 21 and 22. An actuator 16 controls the supply of cooling water to the fermenter. When the actuator is on, water is supplied; when de-energized, there is no water supply.

The device operates as follows.

When the temperature of the culture medium, age, approaches a predetermined value, the contact 12 of the on-off relay unit 11 is closed, since the flow

0 there is no water, and the water in the jacket of the fermenter is warmed up. When the temperature of the culture medium reaches a predetermined value, another make contact 10 of the three-position relay block closes, and

5, the second and third time relays 13 and 14, through the instantly closed contact 15, the actuator 16 is turned on, the water supply starts. The temperature of the water leaving the fermenter decreases rapidly,

0, contact 12 of the on / off relay block opens, the third time relay 14 is de-energized. The actuator 16 will be turned on and the water supply will continue until it opens

5 contact 15 (after a time delay) or contact 10 (when the temperature of the culture medium is lowered). If the cooling water is very cold (the temperature is lower than the calculated one) or the heat dissipation in the fermenter is very weak, contact 10 will open first, and then the two-position temperature control of the culture medium will be set to a predetermined value.

5 IF the temperature of the cooling water and the heat dissipation in the fermenter are close to the calculated values, then before opening of contact 10, contact 20 of the second time relay closes, winding 15 of which rises to

0 self-supply via the make-up contact 9 of the three-position unit 8. A pulsed water supply is established. The actuation time of the actuator is determined by the delay time 5 of the open 15 of the third time relay. The duration of the interruptions in the water supply is determined by the time of heating the water in the fermenter jacket to the set value set on the setter 5. The lower the temperature of the cooling water at

entering the fermenter, the longer it takes to warm the water to a predetermined value. Such a pulsed water supply will continue until the medium temperature decreases by d and contact 9 of the three-position relay unit 8 opens. Due to interruptions in the water supply, the overall cooling rate of the culture medium is small and the temperature of the culture medium deviates downward after the value at which pin 9 is triggered decreases.

When the contact 9 of the three-position unit 8 is opened, the first time relay 17 is de-energized, its contact 19 is closed. When contact 9 closes again due to continued heat dissipation, voltage is applied to actuator 16 through contact 19 and water is supplied, which continues until contact 19 opens. During the water supply, the temperature rise decreases or stops completely. After the water supply is cut off, the temperature rise of the culture medium will continue, but at a reduced rate due to the removal of heat to the jacket-heated water. Due to the reduced heating rate, the deviation of the temperature of the culture medium upward for the set value will be small.

The device provides a change in the temperature of the culture medium between the upper limit (set value) and the lower limit (set value minus the dead band) with small run-outs beyond these limits. The reduction in the amount of run-out is achieved by preliminary influences on the water supply. When the medium is heated, although its temperature has not reached the upper limit, the water supply is turned on. When the medium is cooled, although its temperature has not reached the lower limit, the water supply is turned off. These preliminary effects reduce the rate of change in the temperature of the medium and thereby reduce the amount of stick out,

Preliminary tests of the proposed device on a 50 m fermenter for the production of citric acid showed that at a cooling water temperature of 18 ° C, the deviation of the temperature in the fermenter from the set value does not exceed + 0.25 ° C; -0.75 ° C.

The device can be implemented on commercially available elements of automation.

The device can also be used if only one contact remains in the three-position relay unit 8 for the purpose of temperature control.

Instead of one of the make contacts 9, a contact with a time delay for closing the contact of the second time relay 13 should be installed. Closing this contact after a time delay after opening

another make contact 10 of the three-position unit 8 and stopping the supply of water can signal that the temperature of the culture medium has begun to rise.

FORMULA AND ZOBRETIN

A device for controlling the temperature in the fermenter, comprising a sensor and a parameter setter connected to the inputs of the first comparison element, to the output

which is connected to the input of the three-position relay unit, the actuator and the first time relay, the actuator being connected to the power source through one of the make contacts of the three-position relay unit and the NC contact of the first time relay connected in series, characterized in that, in order to increase the accuracy of the device , it contains a sensor and a setpoint for cooling water temperature at the outlet of the fermenter, connected to the inputs of the second comparison element, the output of which is connected input on-off relay block, and

also a second and third time relay, wherein the winding of the first time relay is connected to the power source through one of the make contacts of the three-position relay unit and connected in series

the opening contact of the second time relay, as well as through the other closing contact of the three-position relay block, the closing and opening contacts of the second

the time relay, the actuator is connected to the power source through a serially connected make contact of the third time relay and another make contact of the three-position relay block, the winding of the second time relay is connected to the power supply through another make contact of the three-position relay unit, and the winding of the third time relay is connected to the power source through a series-connected make contact of a two-position relay block and another make contact of a three-position relay some block.