SU1217448A1 - Method of automatic control of evaporating installation with gravity circulation - Google Patents

Description

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The invention relates to methods for regulating processes in natural circulation evaporators and can be used in the food and microbiological industry, in particular in the manufacture of formobacterin.

The purpose of the invention is to increase the duration of operation of evaporators.

FIG. Figure 1 shows the dependence of the circulation rate V on the heat flux q and the level h in the apparatus; in fig. 2 - schematic diagram of the implementation of the method.

The flow rate of the solution between the steam separator and the heating chamber determines the rate of circulation of the solution in the evaporator.

The choice of circulation rate as a regulating parameter is determined by the following. The circulation rate most fully characterizes the process, since it is a function of the specific heat load of the heating surface and the level in the evaporator (Fig. 1). The circulation rate will increase with increasing level and heat flux in the evaporator. Its intensity depends on the intensity of scale deposition on the walls of the bluetooth chamber, as a result of which the duration of the operation of the evaporator is reduced.

The evaporation process is carried out in an evaporation apparatus containing a heating chamber 1 and a steam separator 2. A circulation velocity sensor 3 is installed on the circulation tube of the evaporator, for example, a flow sensor connected to the regulator 4. The regulator 4 is also connected to the set point five.

A flow sensor 6 and an actuator 7 connected to the regulator 8 are installed on the solution supply line, and a pressure sensor 9 and the actuator 10 connected to the controller 11 are connected to the regulator 11 on the supply line of the heating chamber. The regulator 11 is connected to computational unit 12, associated with pressure sensor 13 installed on the steam separator and sensor 9.

A flow sensor 14 and an actuator 15 connected to the controller are installed on the line of the evaporated solution.

16 the ratio of the costs of the original and one stripped off solutions.

The heat flux to the evaporator unit is stabilized by the controller II, acting on the actuator 10 depending on the pressure drop of the heating and secondary steam in the steam separator 2, measured by sensors 9 and 13 and the computing unit 12. The flow rate of the solution to the evaporator unit is measured Sensor 6, which transmits information to the controller 8. The regulator 8 stabilizes the solution by acting on the actuator 7.

The signal corresponding to the flow of the evaporated solution of the flow sensor 14, together with the signal from the sensor 6, is fed to the ratio controller 16. The controller i6, depending on the value of the specified ratio between the original and the evaporated solution, provides the corresponding flow of the evaporated solution to the actuator 15.

The circulation rate of the solution through the heating chamber 1 is measured by the sensor 3, which transmits information to the controller 4, the controller 4 adjusts the flow rate of the solution to be set proportionally to the circulation rate of the solution through the heating chamber 1. The setting unit 5 sets a limit on the circulation rate taking into account product losses from ash with vapors.

Example. The circulation rate during the operation cycle of the evaporator was measured from 60 to 40% on the scale of the secondary device. At the same time, the flow rate of the installation was changed from 50 to 30, the pressure drop in the heating chamber and steam separator varied from 0.3 to 1.1 atm, the evaporated solution flow rate was from 7 to 4 m / h. The duration of the installation operation cycle was 18 days, while at the same values of flow rates and pressure drop with the known method of controlling the flow rate at installation, the installation operation time was 15 days. Thus, the operation time of the evaporator increased by 20%.

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Claims (1)

METHOD FOR AUTOMATIC CONTROL OF A VAPOR UNIT WITH NATURAL CIRCULATION by stabilizing the flow rate of the solution to the installation, characterized in that. what. in order to increase the duration of operation of the evaporation unit between washes, measure the rate of circulation of the solution between the steam separator and the heating chamber, proportionally adjust the flow rate of the solution to the installation and stabilize the flow of heating steam depending on the pressure drop in the heating chamber and the steam separator.