SU422408A1 - METHOD FOR AUTOMATIC REGULATION OF STERILIZATION TEMPERATURE IN HYDROSTATIC CONTINUOUS ACTION HYDROSTATISLIZERS - Google Patents

Description

one

The invention relates to methods for automatic temperature control, and specifically to methods for automatically controlling the sterilization temperature in continuous hydrostatic sterilizers, and can be used in the production of canned food.

There is a known method of automatically controlling the sterilization temperature in hydrostatic sterilizers of continuous action by changing the flow rate of heating steam supplied to the sterilization chamber, depending on the deviation of the water level in this chamber.

The known method does not have high accuracy of regulation and does not ensure the exclusion of the influence of barometric pressure fluctuations on the parameters and parameters of heating steam on the temperature regime of sterilization.

To eliminate this drawback in the proposed method, the flow rate of heating steam supplied to the sterilization chamber is adjusted depending on the temperature in the sterilization chamber.

The method is illustrated in the drawing, which shows a diagram of an apparatus for its implementation.

The scheme contains vertical chambers 1-3, respectively, heating, cooling and sterilization, chain conveyor 4, sterilized

cans 5. sprocket 6, pipeline 7 for draining water, pipeline 8 for supplying water, a surge vessel 9. differential pressure gauge 10. secondary device 11 with a rheostat

control device, automatic controller 12, steam supply valve 13, automatic bridge 4 with a rheostatic control device and temperature sensor 15.

The proposed method is carried out as follows.

Banks 5. to be sterilized, loaded on an asterisk 6.

Saturated steam is supplied to sterilization chamber 3. which creates excess in it

pressure corresponding to a given sterilization temperature. This pressure is balanced by a water column, whose height is equal to the difference between the levels of the hydraulic valves, and atmospheric pressure.

The following equality is maintained:

p - p 4- D

k - ga

where RK is the pressure in the sterilization chamber; RP - the pressure of the water column of the hydraulic valve;

RP - atmospheric pressure. The upper level of the hydraulic shutter is limited by the start of the pipeline 7 for draining the water connected to the heating chamber 1. Water is supplied through a water supply line 8 connected to the cooling chamber 2.

A leveling device consisting of a leveling vessel connected to a differential pressure gauge which is connected to a secondary device is connected to a sterilization chamber.

The rheostat unit of the secondary device is connected to one of the inputs of the automatic regulator acting on the steam supply valve connected to the sterilization chamber.

The sterilization temperature is automatically controlled through the instrument circuit: a surge vessel, a differential pressure gauge, a secondary instrument, and an automatic controller.

The adjustment is carried out according to the deviation of the water level in the sterilization chamber by changing the steam consumption.

The level reference is set using a rheostatic setting device of the secondary device with Pa const, which corresponds to the setting of the Yak reference (pressure or temperature in the sterilization chamber).

The flow rate of steam supplied to the sterilization chamber is adjusted according to the temperature measured in it, for which the rheostat unit of the automatic bridge is connected to the second input of the automatic controller.

The adjustment of the sterilization temperature is carried out as follows.

When Pa const, the specified water level in the sterilization chamber corresponds to the pressure RK, which determines the sterilization temperature, and if the RC deviates during the sterilization process, the water level in the sterilization chamber deviates from the specified one. The level is restored by an automatic control loop consisting of a surge vessel, a differential pressure gauge, a secondary device and an automatic controller acting on the steam supply valve entering the sterilization chamber, increasing or decreasing its flow rate.

In the event of fluctuations in atmospheric pressure and Pa, the level in the sterilization chamber

changes due to a change in P "with an unchanged RK. Thus, the equality RK PH + + Ra remains unchanged.

Then, the measuring circuit, having received a signal about a level deviation from a predetermined level, outputs a signal to an automatic regulator acting on the steam supply valve, while to eliminate the effect of barometric pressure on the sterilization mode, the correction

The steam consumption according to the temperature in the sterilization chamber is conducted through an automatic controller and an automatic bridge with a rheostatic setting device. Example. A drop in Ra leads to a decrease in the level of water in the sterilization chamber. In this case, the measuring circuit generates a signal to the regulator acting on the valve to reduce the steam flow rate, which leads to a temporary decrease in the RC and, accordingly,

sterilization temperature / s, (to the permutation of the reference level in accordance with the new value of Pa).

Such correction reduces the effect on the temperature mode of sterilization of the deviation of the heating steam parameters from the norm, acting in the same way as in the case of barometric pressure fluctuations, i.e. changing the steam consumption depending on the deviations of the sterilization temperature from the task.

Subject invention

A method of automatically adjusting the sterilization temperature in hydrostatic sterilizers of continuous action by changing the flow rate of heating steam supplied to the sterilization chamber, depending on the deviation of the water level in this chamber, which is because, in order to increase the control accuracy, eliminate the effect of barometric oscillations pressure and parameters of heating steam for temperature sterilization, the flow of heating steam supplied to the sterilization chamber is adjusted depending on the temperature in the chamber e sterilization.

L.

I Odorcing Soda