SU1315882A1 - Device for continuous determining of solidification temperature of fusion cake - Google Patents

Abstract

The invention relates to means for monitoring process parameters and can be used to measure the temperature of crystallisin substances. The purpose of the invention is to increase the reliability of the device. The device contains a flow cell, part of which is located in the refrigerating chamber. Inside the flow cell, made in the form of a tube, a screw with a drive is placed. Differential thermocouples mounted along the axis of the flow are mounted on the blades of the screw auger. Differential thermocouples are connected to a signal selection unit, and one of the thermocouples of each differential thermocouple is connected to a measuring device. On the supply lines of ppava and cooling agent, flow and coolant flow stabilizers are installed. 1 nl I (L 00 I eat CX) 00 th

Description

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The invention relates to the means of controlling the parameters of technological processes and can be used in the chemical, petrochemical, and pharmaceutical industries, in particular, to determine the crystallization temperature of the melt during the production of ammonia seed.

The purpose of the invention is to increase the reliability of the device.

The drawing shows a diagram of an apparatus for determining the crystallization temperature of a melt.

The device, made in the form of a micro calorimeter, contains a flow cell 1, part of which is located in the refrigerating chamber 2. Inside the flow cell, made in the form of a tube, there is a hollow screw 3 with a drive 4. Differential thermocouples 5 are mounted on the blade x of the screw 3 ( Differential thermocouples are connected to signal selection block 6, made in the form of a set of relay elements, using brush contacts 7, and one of the thermocouples of each differential thermocouple through brush contacts 7 and block 6 in boron signal is connected to a monitor 8.

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On the supply lines of Gshava and the cooling agent, the flow stabilizers of the melt 9 and the refrigerant 10 are installed. The working ends of all thermocouples are arranged in increments that ensure that at least two differential thermocouples fall into the crystallization zone.

The device works as follows.

When the melt is fed into the flow cell 1, the cooling agent starts to flow into the chamber 2. In this case, as a result of heat exchange between the walls of the flow cell 1 in the zone of the refrigerating chamber 2 and the melt, the melt temperature decreases to the crystallization temperature. At the same time, to ensure the continuous flow of the fluid, the FLOUGH screw 3 is rotated by means of the actuator 4. Rotating, the screw 3 ensures the melt is forced through the flow cell 1 even in the case of partial crystallization of the sample inside the sampler, which ensures the reliability of the device. Dp increase the durability of the senses Aps of elements of the differential

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These thermocouples 5 are mounted on the outer surface of the blades of the screw 3.

At the crystallization temperature, the process of phase transformation of the melt from the liquid state to the solid state, accompanied by the release of heat, begins. The temperature of the melt sample remains constant until the complete phase transformation for a certain period of time. With the continuous flow of the melt in the flow cell, a constant temperature zone is formed, occupying a certain length of the flow cell by moving the portion of the melt at a certain speed over a certain period of time. In this case, from one of the differential thermocouples 5, located in the zone of constant temperature, which corresponds to the crystallization zone, a zero signal arrives at block 6.

A zero signal from any differential thermocouple of a thermocouple means that this differential thermocouple is located in the crystallization zone of the melt. On this signal, the signal selection block 6 connects to the output of the measuring device B

one of the thermosensitive elements of this differential thermopa. 5, by which the temperature of crystallization of the melt is measured. When the concentration changes, the floating crystallization zone shifts and the zero signal comes from another differential thermocouple 5. It is necessary that at least two differential thermocouples 5 be placed in the crystallization zone, i.e. at least four thermocouples equally spaced along the length of the flow cell of the working ends of thermocouples.

In order to ensure the constancy of the step, it is necessary to keep the costs of the melt and cooling agent constant, thereby maintaining a constant crystallization time. To ensure constant consumption of the melt and the cooling agent, stabilizers of the melt 9 and the coolant 10 are used.

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Claims (1)

Invention Formula A device for continuously determining the crystallization temperature of a melt containing a flow cell in the form of a tube with differential thermocouples, between which a signal selection unit, flow and refrigerant flow stabilizers and a measuring device are installed, which is: it seems. 4fo, with a view reliability of operation, a screw with an actuator is installed in the test cell, while the sensitive elements of differential thermocouples are installed on the outer surfaces of the screw blades. Pla O / ha giving T T agent Editor. Geresi Compiled by S. Belovodchenko Tehred M. Khodanich Proofreader V. But ha Order 2354/46 Circulation 776 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/3 Production and printing company, Uzhgorod, st. Project, 4