Method for automatic control of sugar liquoring process and system for automatic control of realization of this method

FIELD: sugar industry.

SUBSTANCE: method for automatic controlling of sugar liquoring process in horizontal sectional liquoring continuous-action mixer and accumulating mixer includes changing flow of liquoring solution with consideration of liquoring concentration in accumulating mixer. Into sections, where concentration of dry substances does not exceed 18%, lime milk is fed, flow of which is adjusted so, that pH of liquoring in this sections was 10,8-11,2, and stop of sugar feeding into liquoring mixer is performed when liquoring level in accumulating mixer reaches certain level. System for automatic control of sugar liquoring process in horizontal sectional liquoring continuous-action mixer and accumulating mixer includes level sensor in accumulating mixer, mounted in said mixer, liquoring concentration sensor and liquoring solution feeding adjuster into first section of liquoring mixer. Each section of liquoring mixer, except last one, is provided with branch pipe for feeding lime milk, pH indicator and dry substances concentration indicator. Also, system is provided with serially connected valve for stopping sugar feed into liquoring mixer and adjuster, input of which is connected to level indicator, mounted in accumulating mixer, while the latter is connected to liquoring solution feeding adjuster into first section via set-point device, connected to concentration sensor. Use of device allows to increase efficiency of sugar purification due to forming of favorable conditions for decomposition of reducing substances during liquoring. Containment level of reducing substances in sugar liquoring is decreased in 1,4-1,4 times.

EFFECT: higher precision, higher efficiency.

2 cl, 1 dwg, 1 tbl

 

The invention relates to the sugar industry and can be used for process control kierowanie-sugar.

The known method and system for automatic process control kierowanie sugar in a horizontal sectional cleavagey the continuous mixer and agitator-the collection (Voloshin SS, Makarenko, L.P., Rokitski A.A., Jankowski PV automation of beet sugar production. - M.: Food industry, 1980. - S-169). The method involves changing consumption clearaudio solution in the first section cleavagey agitators depending on the level of woodworking and furniture production in the mixer-compilation. The system includes a level sensor in the mixer-the collector sensor, the concentration of the woodworking and furniture production and supply regulator clearaudio solution in the first section cleavagey agitators.

The disadvantages of these methods and systems are the low quality of the woodworking and furniture production, since it assumes all reducing substances-sugar, and low accuracy of the stabilization of a given concentration of woodworking and furniture production, because the flow control clearaudio solution is to change the level of the woodworking and furniture production in the mixer-the collection, and the level is adjusted according to the concentration of the woodworking and furniture production. In the automatic control system is characterized by excessive lag: the period from the date of change of concentration in the finished clerance to IOM the NTA manifestations corrective effect includes not only stay in the woodworking and furniture production cleavagey stirrer (about 15-17 min), but the duration of filling a mixer collection to a certain amount (i.e., 5-10 minutes depending on the flow rate of the woodworking and furniture production and the sensitivity of the level sensor).

The technical result of the invention is to improve the quality of the woodworking and furniture production by creating the most favorable conditions for decomposition of the reducing substances also increase the stability of the concentration of the woodworking and furniture production.

The technical result is achieved in that in the method of automatic process control kierowanie sugar in a horizontal sectional cleavagey the continuous mixer and agitator-a collection of amending the consumption clearaudio solution in the first section cleavagey agitators depending on the level of woodworking and furniture production in the mixer-the collection, what's new is that the change in the flow rate clearaudio solution is performed taking into account the concentration of the woodworking and furniture production in the mixer-the collection, and in those sections cleavagey stirrer, in which the concentration of solids does not exceed 18%, serves the milk of lime and regulate its flow so that the pH of the woodworking and furniture production in these sections ranged from 10.8 to 11.2 and the supply of sugar in claromeco the stirrer is stopped when the level of the woodworking and furniture production in the mixer-the collection of a certain value. In the automatic process control kierowanie sugar in a horizontal sectional cleavagey stirrer continuous on istia and agitator-compilation includes a level sensor in the mixer-the collector sensor, the concentration of the woodworking and furniture production and supply regulator clearaudio solution in the first section cleavagey stirrer, what's new is that the concentration sensor installed in the woodworking and furniture production mixer-the collection and each section cleavagey mixer, except the last, is equipped with a nozzle for supplying milk of lime, the pH probe and sensor dry substance concentration, the system is equipped with series-connected valve to stop the flow of sugar in claromeco mixer and controller, whose input is connected to the level sensor is placed in a stirrer-the collector, the latter being connected with the supply regulator clearaudio solution in the first section by means of the setting device, to the second input of which is connected the sensor to the concentration of the woodworking and furniture production.

The invention is illustrated in the drawing, which shows a fragment of a scheme of automatic process control kierowanie for the first section cleavagey stirrers. The scheme includes a horizontal sectional claromeco mixer 1 continuous operation, the stirrer-collection 2, sensor 31pH sensor 41the concentration of solids in the first section, the sensor 13 level woodworking and furniture production and the sensor 14 of the concentration of solids in the mixer-compilation setting device 5 and 10, the controllers 6, 11, 12 and 15, the valve 7-9, 16 and 17, a pump 18. In the diagram taken from ewusie notation: PST, RL, R1-R7information signals between elements of the management part of the schema.

The system and method are as follows.

Raw sugar and kharousi solution, for example, promo with the filters are in the first section cleavagey mixer 1, which represents a sectional trough-shaped vessel in which ciruela mass moves towards the exit with stirring blades. Each section cleavagey mixer, except the last, is equipped with a nozzle for supplying milk of lime, the pH sensor and the concentration of the woodworking and furniture production. The lime milk consumption in the first section change the controller 6 on the basis of the signalsandcoming respectively from the sensors 31and 41. The job of the regulator 6 (signal P1) generates a setting device 5 in accordance with the algorithm: if the concentration of dry matter (DM) in the first section does not exceed 18%, in this section served the milk of lime, the consumption of which (signal R2) adjusted depending on the pH of the solution in this section (the pH should be about 10.8 to 11.2); if the concentration of SP in the first section is more than 18%, the milk of lime in this section is not available.

In the mixer-a collection of installed sensor 14 concentration of ne woodworking and furniture production, C is cash which goes to specifying the device 10, forming the task (signal R3) controller 11, the control valve 9, changing consumption clearaudio solution in the first section cleavagey stirrers. Normal concentration of SP in the finished clerance should be 55-60%. Lowering the concentration of ne woodworking and furniture production less than 55% consumption clearaudio solution decreases with increasing concentration of SAINT more than 60% of consumption clearaudio solution increases. In steady state consumption clarysage permanent solution. Therefore, the concentration of the woodworking and furniture production remains constant and equal to a given (55-60%). When changing the concentration of the woodworking and furniture production in the mixer-collection of change: the signal RSTfrom the sensor 14 and the control signals R3and R4in accordance with the algorithms of the device, which leads to the necessary correction of consumption clearaudio solution in claromeco stirrer. This leads to the constancy of the concentration of the finished woodworking and furniture production.

In the mixer-a collection of installed sensor 13 level woodworking and furniture production, forming the signal RLequal to either 0, -1 or +1. The signal RLcomes to specifying the device 10, the controllers 12 and 15. If RL=+1 (the level in the mixer-the collection has reached its maximum value), specifies the device 10, acting on the regulator 11, through valve 9 stops feeding clearaudio solution in claromeco mixer, simultaneously, the controller 12 affecting the and valve 8 (signal R 5) stops the supply of sugar in claromeco stirrer. If RL=-1 (the level in the mixer-the collection has reached a minimum value), the controller 15 operates the valves 16 and 17 (signals P6and R7operating in the opposite: the valve 17 is closed and valve 16 is fully open and is being circulated woodworking and furniture production pump 18 back into the mixer. If RL=0 (level of woodworking and furniture production in the mixer-a collection of normal), the valve 16 is closed and valve 17 is opened. When this correction sugar consumption does not occur and the flow clearaudio solution is carried out only on the concentration of the woodworking and furniture production ready.

It is known that the bulk of asharov and almost all reducing substances are found in the outer layer adjacent to the crystal sugar microcannula solution. In the process of kierowanie (dissolution) first pass into the solution of the substance in the film on the surface of the crystals, and then begin to dissolve sugar crystals themselves. At the beginning of the dissolution of sugar, when the mass fraction of dry substances in microtelecom solution reaches 12-18% in solution are transferred almost all of Asahara film on the surface of the crystals. Viscosity 12-18%sugar solution is much smaller than the viscosity of the finished woodworking and furniture production, containing up to 55-60% ST. It is known that the lower the viscosity of the solution, the more intense it flow mass transfer and the other processes. Therefore, it is in early kierowanie creates the most favorable conditions for the processes of coagulation, neutralization and decomposition of asharov and, first of all, reducing substances, the number of which can reach more than 1% by weight of raw sugar. I.e. the introduction of milk of lime at the beginning of kierowanie, provides the most effect complete decomposition of the reducing substances.

The table below shows comparative data of the proposed and known inventions.

The use of the invention improves the efficiency of purification of sugar due to the fact that when kierowanie creates the most favorable conditions for decomposition of the reducing substances (the content of reducing substances in Kirovka raw sugar is reduced to 1.3-1.4 times) and increases the stability of the concentration of the woodworking and furniture production (1.5 times reduces the inertia of the control system).

Table
IndexThe known methodThe proposed method
The content of reducing substances in Kirovka, % by weight of raw sugar0,520-of 0.6150,362-0,481
The period from the date of change of concentration of the woodworking and furniture production, for example, due to dilution clearaudio solution, until the moment in which Stanovlenie setpoint its concentration, min23-2715-17

1. The method of automatic process control kierowanie sugar in a horizontal sectional cleavagey the continuous mixer and agitator-a collection of amending the consumption clearaudio solution in the first section cleavagey agitators depending on the level of woodworking and furniture production in the mixer-collector, characterized in that the change in the flow rate clearaudio solution is performed taking into account the concentration of the woodworking and furniture production in the mixer-the collection, and in those sections cleavagey stirrer, in which the concentration of solids does not exceed 18%, serves the milk of lime and regulate its flow so that the pH of the woodworking and furniture production in these sections ranged from 10.8 to 11.2, and the supply of sugar in claromeco the stirrer is stopped when the level in the woodworking and furniture production mixer-the collection of a certain value.

2. Automatic process control kierowanie sugar in a horizontal sectional cleavagey the continuous mixer and agitator-a collection that includes a level sensor in the mixer-the collector sensor, the concentration of the woodworking and furniture production and supply regulator clearaudio solution in the first section cleavagey mixer, characterized in that the concentration sensor installed in the woodworking and furniture production mixer-the collection and each section cleavagey mixer, except the last, is equipped with a pipe for feeding lime supposedly the ka, sensor pH sensor dry substance concentration, the system is equipped with series-connected valve to stop the flow of sugar in claromeco mixer and controller, whose input is connected to the level sensor is placed in a stirrer-the collector, the latter being connected with the supply regulator clearaudio solution to the first section by means of the setting device, to the second input of which is connected the sensor to the concentration of the woodworking and furniture production.



 

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