SU1005803A1 - Method of automatic control of evaporation process - Google Patents

Abstract

A METHOD FOR AUTOMATIC REGULATION OF THE VAPORATION PROCESS by varying the flow rate of the mixture depending on the difference in the boiling point of the target product and the amount being boiled. solution, I distinguish it with the fact that, with a chain of stabilization of the quality of the target product due to an increase in the accuracy of regulation, it was added. However, the temperature of the raw material mixture and the flow rate of the heat carrier in the upper jacket of the evaporator are regulated depending on the temperature of the raw material mixture and the boiling point of the target product.

Description

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The invention relates to automatic control of the process of injection of solutions and can be applied in the petrochemical, food and medical industries.

There is a known method of automatically controlling the process of balancing by stabilizing the flow rate of the mixture, changing the flow rate of the heat transfer medium to the upper jacket of the evaporator depending on the boiling point of the product to be evaporated and the concentration of the target product and changing the flow rate of the coolants to the bottom jacket of the evaporator depending on the concentration and temperature of the target product 1.

The closest to the invention to the technical essence is a method of automatic control of the process of blending by changing the flow rate of the raw mix depending on the difference in boiling points of the target product and the solution 2 being evaporated.

However, the use of the known method does not give the necessary stabilization of the quality of the target product, since the temperature of the feed stream significantly affects the process of mixing. The aim of the invention is to stabilize the quality of the target product.

The goal is achieved by, IJJTP additionally measuring the temperature of the raw mix and regulating the flow rate of the heat carrier to the top jacket of the evaporator depending on the temperature difference of the raw mix and the boiling point of the target product.

When the temperature of the feed stream changes (subject to stabilization of its flow), the heat balance of the upper part of the evaporator changes, which leads to a change in the pressure in the evaporator and a change in the heat balance of the lower part (after 5-10 microns for a two-section film evaporator). Such fluctuations in operating parameters affect the conditions of the process of cooking. The quality of the upper target product in transient regimes changes due to the RES of the inertia of the temperature control system of the lower part of the evaporator.

The drawing shows a functional diagram of the device that implements the method ..

The raw material mixture flows through conduit I to the evaporator 2, where the drying of the target product takes place, the vapors of which are transported via conduit 3 to further processing, and the heavy fraction is withdrawn through conduit 4.

The temperature of the mixture is measured by p. The primary converter 5, from which the signal is transmitted to the comparison device 6, the temperature in the boiling point of the solution to be evaporated is measured by the primary converter 7, the signals are sent to the comparison device 8. The pressure in the evaporator is measured by the primary converter 9, and the signal is transmitted to the functional device U, converts the pressure to the boiling point of the light fraction. The signal from the output of the device 10 enters the comparison device 3 and the comparison device 6. The resulting signal from the comparison device 8 is fed to the actuator 11 on the raw material feed inlet pipe to the evaporator and the actuator 12 on the coolant inlet pipe to the jacket of the lower evaporator 2 The resulting signal from the comparator device 6 is fed to the actuator 13 on the pipeline for the introduction of the coolant; into the jacket of the upper part of the evaporator 2. The method is carried out as follows.

When changing (increasing) the consumption of the mixture in the evaporator 2 through the pipeline I at the initial moment, the temperature in the upper part of the evaporator changes (decreases), and consequently the pressure in the apparatus determined by the primary converter 9 .-- Output (the signal from the primary converter 9 comes into the functional device 10. (converting the pressure value into the value of the boiling point of the light fraction), from where it arrives at the comparison device 8. This is also the signal from the primary converter 7, which changes the tempo The boiling point of the heavy fraction (evaporated solution). The resulting signal of the comparator device 8 goes to the actuators 11 and 12, reducing the supply of the cfie mixture and increasing the flow of the coolant into the jacket and its part of the evaporator, respectively. At the same time, the output signal of the device U is fed to the compare device 6. Here comes the signal from the primary converter 5. In the case when the input flow temperature is constant and, therefore, the signal removed from the primary converter 5 is constant, then the control Leniye occurs only through the device 8. In the case of changing (decreasing) the temperature of the device is turned sfevoy mixture comparator 6,

310058034

realizes the function of determining the spacing (the temperature of the heavy fraction, the boiling point of the light fractionation in the evaporator), which in turn

(target product) and the temperature of sf-stabilizes the bleed of light fracoia

evoy mixture (input stream). Reeulti- (its quality).,

signal from the comparison device 6, j According to the proposed method,

act on the actuator 13, the concentration of the target product

changes (increases) the flow of heat-in the production solution is

cai-ate in the top of the shirt evaporate-2 3%,

bodies in such a way that the corrected use of the invented gives rise to

change in heat balance in the ability to get an economic affect

top part. The consequence of this is due to the stabilization of the quality of the target

with the constancy of the thermal balance of the bottom product by stabilizing the regime

parts of the evaporator, i.e., stabilization of the re-parameters of the evaporator.

Claims (1)

METHOD OF AUTOMATIC REGULATION OF THE PROCESS IS EVAPORATED BY changing the flow rate of the raw material mixture depending on the difference between the boiling points of the target product and the evaporated solution, characterized in that, in order to stabilize the quality of the target product by increasing the accuracy of regulation, the temperature of the raw mixture and the flow rate of the heat carrier are additionally measured the evaporator jacket is controlled depending on the temperature difference of the feed mixture and the boiling point of the target product. - SU _p .1005803