SU672462A1 - Automatic control system for spray-drying of liquid materials - Google Patents

Description

one

The invention relates to the microbiological industry and can be used to automatically control the drying process of a yeast suspension in spray drying plants.

A system is known for automatically controlling the drying process for liquid materials, which contains the loops to stabilize the initial temperature of the heat transfer fluid and the temperature of the exhaust heat transfer fluid with appropriate controls, the level gauge and the flow meter of the sprayed material.

Moreover, to coordinate the performance of the evaporator and dryer, the level of the yeast suspension in the collector acts on the inlet of the vapor pressure regulator (initial temperature of the coolant 1.

However, the known system does not provide for the relationship between the initial temperature of the coolant and the temperature of the spent coolant during operation of the plant B, depending on the current value of the level of the suspension fed to the dryer.

The aim of the invention is to optimize the process of drying liquid materials.

The goal is achieved by the fact that the system contains three adders and two blocks of scale factors, with the level gauge and the flow meter of the material being sprayed through one adder connected to both blocks of scale coefficients that are connected to the regulators of the initial heat carrier temperature and the exhaust heat carrier temperature through the other two adders.

The invention is illustrated in the drawing, which shows a diagram of the described system for automatically controlling the spray-drying process for liquid materials, for example, a yeast suspension.

The system includes a stabilization circuit for the initial temperature of the coolant, a circuit for stabilizing the temperature of the exhaust coolant and a circuit for determining the optimal values of these temperatures.

Claims (1)

The temperature stabilization circuit of the spent coolant contains a temperature sensor 1, a controller 2 and an executing mechanism 3 installed on the yeast suspension supply line to the dryer 4, the temperature sensor 1 being connected to the input of the regulator 2, and the latter with the actuator 3. In the circuit stabilizing the initial temperature of the coolant includes a temperature sensor 5, a controller 6 and an actuator 7 installed on the fuel supply line to the furnace 8, while the temperature sensor 5 is connected to the input of the controller 6, and the latter with an operating mechanism 7. The circuit for determining the optimal values of the initial and final temperatures of the coolant includes a level gauge 9, measuring the level of the yeast suspension in collector 10, a flow meter 11 of the sprayed suspension supplied to the dryer, an adder 12, summing these signals into a level value setting signal in collector 10, two blocks 13 of scale factors serving to multiply the received signals by the corresponding coefficients, and two more adders 14. At the same time, the outputs of the level meter 9 and the flow meter 11 are connected The inputs to the adder 12, the output of which is connected to the inputs of the blocks 13, and the outputs of these blocks are connected to the inputs of the adders 14, which are connected to the inputs of the setting of the regulators 2, 6 of the temperature of the exhaust heat carrier and the initial temperature of the heat carrier. The automatic process control system of the spray spout operates as follows. In the process of spray drying the yeast suspension, it is possible to change the moisture content of dry fodder yeast at the outlet of the installation, which, as a rule, leads to a decrease in the quality of the product. In addition, when the spray substance of the yeast suspension is possible, the technological modes of the substance with increased heat consumption are possible due to the wrong choice of the temperature of the spent heat carrier and the initial temperature of the heat transfer fluid, if the total productivity of the yeast shop is changed. When increasing or decreasing the amount of yeast suspension entering the plant, the plant performance is determined by the level gauge 9 and the flow meter 11. In the adder 12, the signals of these sensors and the target level signal in the collection according to the GCI equation Ntek - H ass + GJ ,, where GCI - installation capacity is required for the flow of yeast suspension Ntek - the current value of the level in the collection of yeast suspension; Hjifl is a predetermined level value in the yeast suspension collection; Og - the current value of the flow of yeast suspension entering the drying. In blocks 13 and adder 14, a dependence is formed corresponding to the optimum value of the temperature of the spent heat carrier and the initial temperature of the heat carrier B depending on the plant capacity required for the flow of yeast suspension in this technological situation. A change in the setting by the controllers 2 and 6 leads to a corresponding change in the technological mode as a result of a change in the supply of the yeast suspension to the dryer and the supply of fuel to the furnace by the actuators 3 and 7. Thus, the system ensures optimum operation of the installation in the whole technologically possible range of the flow rate of the installation. suspensions. Claims The system for automatically controlling the spray drying process for liquid materials, such as yeast slurry, contains loops to stabilize the initial coolant temperature and the spent coolant temperature with appropriate controls, level gauge and flow meter of the sprayed material, which in order to optimize the drying process, the system contains three adders and two blocks of scale factors, with the level gauge and the flow meter being connected to both blocks through one adder and the scale factors, which rest through two adders are connected to the controller tori initial temperature of the heat medium and the exhaust temperature of the heat medium. Sources of information taken into account during the examination 1. L. Brusilovsky. Automation of technological processes for the production of canned milk. M., Food Industry, 1975, p. 80-88.