METHOD FOR CONTROLLING THE VEGETABLE OIL PRODUCTION LINE Russian patent published in 2022 - IPC C11B1/00 

FIELD: fat-and-oil industry.

SUBSTANCE: invention relates to the automation of engineering processes and can be used in the fat-and-oil industry, in particular in controlling the vegetable oil production line. A method for controlling the vegetable oil production line, which provides for drying seeds with a drying agent with a temperature of 89-90°C to a humidity of 8%; grinding of dried seeds in a roller machine up to 1 mm, additional grinding of a large fraction after a separating machine; roasting of the crushed fraction to a humidity of 1.5-3.0% in a vat roaster with a stirrer and steam heating of the frying surface; mechanical extraction of the formed fiber in the pre-press with the removal of the pre-press cake for extraction; filtration of the resulting oil in a drum filter press under a pressure of 0.2-0.5 MPa; freezing of wax substances from filtered oil in the expositor at a temperature of 8-12°C to 0.03% of the oil mass; removal of oil from the expositor as finished products; cleaning of spent drying agent with a temperature of 60-70°C and moisture content of up to 0.030 kg/kg, first in a cyclone, and then in a fine filter to a dust fraction content of no more than 30 mg/m; the discharge of the spent purified drying agent first into the air receiver, then into an intermediate heat exchanger between the flows of the spent drying agent and the one fed into the dryer, and then for cooling to the dew point temperature and dehumidification to a moisture content of 0.005-0.009 kg/kg in the cold receiver of a steam-ejector heat pump, including an ejector, an evaporator, a recirculation pump, a temperature-regulating valve, steam generator with electric heating elements and a safety valve, a condensate collector; supply of working steam produced in the steam generator to the ejector; creation of vacuum by ejected vapors in an evaporator with a boiling point of 5-7°C water used as a refrigerant; supply of a mixture of working and ejected vapors to the nozzle of the ejector, in the diffuser of which the kinetic energy of the mixture flow is converted into thermal energy of high-potential steam with a temperature of 210-220°C, supplied for heating the frying surface of the vat roaster; the supply of low-potential steam after the roaster through the steam receiver to the heat exchanger-recuperator, in which, due to regenerative heat exchange, the drying agent is heated with subsequent supply to the dryer in a closed cycle mode; the removal of part of the formed condensate from the heat exchanger-recuperator first through a temperature-regulating valve to replenish the loss of water in the evaporator, and the supply of the other part together with the formed condensate in the cold receiver, first into the condensate collector, and then to replenish the water level in the steam generator; the supply of a refrigerant with a temperature of 5-7°C to the cooling jacket of the expositor for cooling the oil and returning water to the cold receiver in a closed cycle mode; and providing microprocessor control of technological parameters with continuous measurement of temperature, moisture content and consumption of oilseeds fed into the dryer; temperature, flow and moisture content of the drying agent before and after the dryer; flow, temperature and humidity of crushed seeds after the separating machine; the flow rate and temperature of high-potential steam for heating the frying surface of the vat roaster; consumption and temperature of low-potential steam supplied through the receiver to the heat exchanger-recuperator; consumption of fiber obtained as a result of frying; consumption of vegetable oil after the pre-press; consumption of filtered oil after the drum filter press, oil temperature in the expositor; consumption of oil purified from wax substances after the expositor; pressure and water level in the steam generator; dilution, temperature and water level in the evaporator; condensation temperature of water vapor from the spent drying agent in the cold receiver; the flow rate and temperature of the refrigerant supplied to the cooler and to the cooling jacket of the expositor; at the same time, according to the current values of the flow rate, temperature and humidity of the initial seeds, the microprocessor sets the temperature and flow rate of the drying agent supplied to the dryer; sets the rotation frequency of the rollers and the distance between them in the roller machine depending on the humidity of the dried seeds; according to the magnitude of the mismatch of the current seed humidity at the outlet of the vat roaster with a given value, it sets the flow rate and temperature of high-potential steam by affecting the flow rate of the working steam by changing the steam output of the steam generator; stabilizes the oil output from the pre-press depending on the oil content of the seeds by affecting the power of the pre-press screw drive; controls the pressure of oil supplied to the drum filter press, the rotation frequency the drum of the drum filter press and the consumption of compressed air for the oil filtration process; according to the flow rate of the filtered oil, the refrigerant flow rate is set in the expositor cooling jacket; according to the measured values of the humidity content of the drying agent before and after drying and its flow rate at the outlet of the dryer, it determines the amount of water vapor in the spent drying agent, according to which it sets the boiling point of the refrigerant in the evaporator by affecting the ejection coefficient of the steam-ejector heat pump by changing the ratio of the flow rates of the working steam supplied to the nozzle of the ejector and the ejected refrigerant vapor from the evaporator with continuous monitoring of the humidity content of the drying agent after the cold receiver; the change in the steam capacity of the steam generator is carried out by affecting the power of electric heating elements, and when the water level in the steam generator decreases below the set value, it supplies water from the condensate collector to the steam generator, and when the steam pressure in the steam generator reaches the upper limit value, it relieves the steam pressure through a safety valve.

EFFECT: invention makes it possible to increase the accuracy and reliability of the control of the vegetable oil production line, which ensures higher quality of the obtained vegetable oil, to increase productivity with the rational use of energy costs.

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