Method for operating a calorimeter
View Patent ↗A method for operating a calorimeter and a calorimeter that is operable to perform the method, wherein the calorimeter has a reactor ( 1 ) for receiving a reaction medium, a reactor jacket ( 2 ), an in-reactor heater ( 4 ) controlled by means of a first controller ( 6 ), an outer temperature control unit ( 9 ) in thermal contact with the reactor and controlled by a second controller ( 10 ), and a measurement sensor ( 5 ) arranged in the reactor for determining a reactor temperature (T r ). The reactor temperature is controlled by the heat which is delivered to the reactor by the in-reactor heater and by the heat that is carried in and/or out by the outer temperature control unit. A dynamic control of the heating power of the in-reactor heater and of the outer temperature control unit is used to eliminate any deviation of the reactor temperature from a reactor set-point temperature.
1. A method for operating a calorimeter comprising a reactor for receiving a reaction medium, a reactor jacket, an in-reactor heater controlled by a first controller, an outer temperature control unit in thermal contact with the reactor and controlled by a second controller, and a measurement sensor arranged in the reactor, the method comprising the steps of:
setting a set-point temperature for the reactor and entering the reactor set-point temperature into the first controller;
determining a reactor temperature using the measurement sensor and determining a deviation of the reactor temperature from the reactor set-point temperature as a control deviation of the first controller, the reactor temperature being controlled by the heat delivered to the reactor by at least one of the in-reactor heater and the outer temperature control unit and by the heat taken away from the reactor by the outer temperature control unit;
splitting the determined control deviation into first and second parts, and dynamically adjusting the power, to compensate for the control deviation, through the substeps of:
delivering the first part as heat to the reactor by the in-reactor heater, and
entering the first and second parts into the second controller for controlling the outer temperature control unit, and
adjusting the reactor temperature to the reactor set-point temperature as a result of the heat carried into and/or out of the reactor.
2. The method of claim 1 , wherein:
the step of determining the reactor temperature occurs at predetermined time intervals or continuously.
3. The method of claim 2 , wherein:
the first part of the control deviation corresponds to a set-point range.
4. The method of claim 2 , wherein:
the first part of the control deviation has the form of a sigmoid function.
5. The method of claim 2 , wherein:
the substep of entering the first and second parts of the control deviation to the second controller, which is configured as a cascade controller, is achieved by:
delivering the first part to a proportional operator of the second controller; and
delivering the second part to an integrating operator of the second controller.
6. The method of claim 5 , wherein:
the substep of delivering the first part of the control deviation power as heat to the reactor is achieved by the in-reactor heater, which is an electrical heater whose power is controlled by the first controller.
7. The method of claim 6 , wherein:
the second controller controls a temperature of a reactor jacket that cooperates with the outer temperature control unit.
8. The method of claim 7 , comprising the step of:
calculating an input for the second controller, using the second part of the control deviation and feeding the calculated input into the second controller.
9. The method of claim 1 , wherein:
the substep of entering the first and second parts of the control deviation to the second controller, which is associated with the first controller as a cascade controller, is achieved by:
delivering the first part to a proportional operator of the second controller; and
delivering the second part to an integrating operator of the second controller.
10. The method of claim 1 , wherein:
the substep of delivering the first part of the control deviation power as heat to the reactor is achieved by the in-reactor heater, which is an electrical heater whose power is controlled by the first controller.
11. The method of claim 1 , wherein:
the second controller controls a temperature of a reactor jacket that cooperates with the outer temperature control unit.
12. The method of claim 1 , wherein:
the step of splitting the determined control deviation occurs in a logic circuit, based upon predetermined inputs, including the maximum power of the in-reactor heater and a proportional part of the first controller.
13. A calorimeter, comprising:
a reactor for receiving a reaction medium;
an in-reactor heater to supply heat to the reactor;
a first controller, in controlling communication with the in-reactor heater;
an outer temperature control unit in thermal contact with the reactor for supplying heat thereto or removing heat therefrom;
a second controller, in controlling communication with the outer temperature control unit and in communication with the first controller;
a first measurement sensor, arranged in the reactor for determining a reactor temperature, the first measurement sensor in communication with at least the first controller so that a deviation of the reactor temperature from a reactor set-point temperature is dynamically adjusted through the heating power of the in-reactor heater and the outer temperature control unit; and
a control unit on which a computer program is stored, the computer program comprising an instruction set that implements an operating method that comprises the steps of:
setting a set-point temperature for the reactor and entering the reactor set-point temperature into the first controller;
determining a reactor temperature using the measurement sensor and determining a deviation of the reactor temperature from the reactor set-point temperature as a control deviation of the first controller, the reactor temperature being controlled by the heat delivered to the reactor by at least one of the in-reactor heater and the outer temperature control unit and by the heat taken away from the reactor by the outer temperature control unit;
splitting the determined control deviation into first and second parts, and dynamically adjusting the power, to compensate for the control deviation, through the substeps of:
delivering the first part as heat to the reactor by the in-reactor heater, and
entering the first and second parts into the second controller for controlling the outer temperature control unit, and
adjusting the reactor temperature to the reactor set-point temperature as a result of the heat carried into and/or out of the reactor.
14. The calorimeter of claim 13 , further comprising:
a reactor jacket that cooperates with the outer temperature control unit.
15. The calorimeter of claim 14 , wherein:
the second controller is in a cascade arrangement with the first controller.
16. The calorimeter of claim 13 , wherein:
the second controller is in a cascade arrangement with the first controller.
17. The calorimeter of claim 13 , further comprising:
a further controller, communicated to each of the first and second controllers, the further controller operating to communicate the first and second controllers with each other.