Process for automatic control of sugar clarification and automatic control system for performing the same

FIELD: sugar making industry branch, possibly automatic control of clarification of raw sugar material.

SUBSTANCE: method for automatic control of clarification of sugar by means of sugar-containing solution in successively joined auger and horizontal sectional clarifying agitator at supplying sugar to auger comprises steps of controlling flow rate of sugar-containing solution to clarifying agitator depending upon concentration of dry matters in clarified product; supplying to auger catholyte with pH 10 - 11.5 and feeding to first section of clarifying agitator milk of lime; controlling flow rate of catholyte in such a way that in those section of clarifying agitator where clarifying process is going on for 4 - 6 min concentration of dry matters is in range 12 -18% and controlling flow rate of milk of lime in such a way that pH in the same section is in range 10.8 - 11.5; supplying sugar- containing solution to next sections of clarifying agitator along motion direction of sugar in it; measuring concentration of dry matters in order to control flow rate of sugar-containing solution in last section of clarifying agitator. Automatic control system for controlling clarification of sugar in successively joined auger and horizontal sectional agitator includes circuit for stabilizing concentration of dry matters of clarified product with use of pickup for measuring concentration of dry matters. Auger is provided with branch pipes for feeding catholyte into it. Clarifying agitator includes branch pipe for feeding lime of milk to first section. Pickup for measuring concentration of dry matters is arranged in last section of clarifying agitator. System includes in addition circuit for controlling quality of clarification having pickups for measuring pH and concentration of dry matters, both placed in one section of clarifying agitator and pickup for measuring catholyte flow rate; regulators and valves. One valve is mounted inline for feeding milk of lime and other valve is mounted inline for feeding catholyte.

EFFECT: enhanced efficiency of sugar clarification due to favorable conditions for decomposing reducing compounds, improved stability of concentration of clarified product.

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 charcterised solution of series-connected auger and horizontal sectional cleavagey stirrer (Voloshin SS, Makarenko, L.P., yatskovskiy PV automation for sugar production. - Moscow: Agropromizdat, 1990. S-153). The method provides for the supply of sugar in the auger and the flow control charcterised solution in claromeco mixer depending on the consumption of sugar and the dry substance concentration of the woodworking and furniture production. The system contains a circuit stabilizing the concentration of dry matter (DM) of the woodworking and furniture production, including the concentration sensor SV, the regulator and the valve on the supply clarysage charcterised solution.

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 the concentration of the woodworking and furniture production, because the flow control clearaudio solution is performed according to the change in the concentration of ne woodworking and furniture production at the outlet of the collector that is installed in series with cleavagey stirrer. In the automatic control system is characterized by excessive lag: the period from the moment of the change of concentration in the finished clerance until symptoms corrective effect includes not only stay in the woodworking and furniture production cleavagey stirrer (about 15-17 min), but the duration of filling of the collection to a certain amount (i.e., 5-10 min).

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 and 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 charcterised solution of series-connected auger and horizontal sectional cleavagey stirrer with flow sugar auger, providing flow control charcterised solution in claromeco mixer depending on the concentration of dry substances of the woodworking and furniture production, what is new is that in the auger serves catholyte with a pH of 10-11,5, and in the first section cleavagey mixer - lime milk, and consumption of Catolica is adjusted so that in the section cleavagey stirrer, in which kierowanie lasts 4-6 min, the concentration of solids was 12-18%, and consumption milk of lime so that the pH in this section 10.8-11,5, and charaterise solution serves in the following sections cleavagey agitators in the direction in sugar, the consumption of charcterised of the solution is regulated depending on the concentration of dry substances of the woodworking and furniture production in the last section cleavagey stirrers. In systems of the automatic control process kierowanie sugar charcterised solution of series-connected auger and horizontal sectional cleavagey mixer with the sugar supply to the auger, contains the path to stabilization of dry substance concentration of the woodworking and furniture production, including the sensor, the concentration of dry matter, what's new is that the auger is equipped with nozzles to feed it Catolica and klenovica stirrer coupling to feed it milk of lime in the first section, and a probe concentration of solids in the circuit stabilization of dry substance concentration of the woodworking and furniture production is set in the last section cleavagey mixers, in addition, set the control loop as the woodworking and furniture production, consisting of sensors, pH and concentration of dry substances, installed in one of the sections cleavagey agitators, flow sensor Catolica, regulators and valves, one of which installed on the supply line lime milk and the other on the supply line of Catolica.

The invention is illustrated in the drawing, which shows a diagram of automatic process control kierowanie. The scheme includes a centrifuge 1, screw 2, a horizontal sectional claromeco mixer 3 continuous operation, the circuit stabilize the concentration of ne woodworking and furniture production and loop control its quality. The first circuit consists of a sensor 7 concentrations of NE, the control unit 9 centrifuges, regulators 10, 11 and valves 12, 13. The second circuit from the sensor 14 consumption Catolica, sensor 15 concentration SV sensor 16 pH regulators 17 -19 and valves 20, 21.

The system and method are as follows.

Raw sugar is unloaded from the centrifuge 1 screw 2, which serves catholyte with a pH of 10-11,5 and a temperature of 60-70°obtained by treatment of a solution of chlorine-containing electrolyte, for example sodium chloride. The introduction of sugar together with strong alkaline Catolica provides the alkaline environment of the woodworking and furniture production of sugar, which negatively affects the development of microflora in the process of kierowanie and on the path of feed of the woodworking and furniture production for further purification. It is known that in the process of electrochemical activation, the viscosity of the solution decreases. Therefore, in Kirovka obtained using Catolica, all reactions on defecation go faster.

A mixture of sugar and Catolica served in the first section cleavagey mixer 3 are a sectional trough-shaped vessel in which ciruela mass moves towards the exit with stirring blades. This section is equipped with a pipe for feeding it milk of lime. The lime milk consumption in the first section change the controller 17 to the signal from the pH sensor 16 installed in the section cleavagey stirrer, in which the duration of kierowanie is 4-6 min from the time of mixing sugar with Catolica. In the normal pH claramae mass in this section should be 10,8-11,5.

In this section of larvacea agitators installed sensor 15 concentrations of NE, the signal from which is supplied to the controller 19, corrective assignment to controller 18, which controls the flow of Catolica in the auger signal from the sensor 14 of the flow acting on the valve 21. Moreover, the consumption of Catolica is adjusted so that in the section cleavagey stirrer, in which kierowanie lasts 4-6 min (N-th section), the concentration of SV was 12-18%. Lowering the concentration of ne woodworking and furniture production less than 12% of the consumption of Catolica reduce, by increasing the concentration of ST more than 18% of the consumption of Catolica increase.

The circuit stabilize the concentration of the woodworking and furniture production involves a preliminary flow control charcterised solution supplied to kierowanie. The regulation is performed according to the signal, proportional to the number of discharging centrifuges. A lot of sugar, which is directed through the screw 2 in claromeco mixer determines the control unit 9, the output signal which is proportional to the amount of unloading centrifuge periodic operation, is supplied to the controller 10 for controlling the operation of valve 12 to supply line charcterised solution in the section cleavagey stirrers, which follows the N-th section in the direction of travel of sugar in the mixer. Temperature Claremore charcterised solution is 75-85°C.

The regulation of the concentration of ne woodworking and furniture production are carried out by the signal from the sensor 7 of the concentration of SP in the last section is larvacea stirrers, the output signal of which is supplied to the controller 11 for controlling the operation of valve 13 to supply line charcterised solution in some sections cleavagey stirrer, the following N-th movement of sugar in the mixer.

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 in ST. microtelecom solution reaches 12-18%, pass into the solution 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 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 Catolica, and then milk of lime at the beginning of kierowanie provides affectable full decomposition of the reducing substances.

The table below shows comparative data of the proposed and known inventions. To assess the quality of the woodworking and furniture production presents the values of purity and color treated the woodworking and furniture production. The data show that the proposed method allows to increase the purity of the purified woodworking and furniture production by 0.3 to 0.5 units by comparison with the known method. In addition, the use of the invention improves the stability of the concentration of the woodworking and furniture production by reducing the lag time of the control action.

Table
IndexThe known methodThe proposed method
The purity of the purified woodworking and furniture production (the ratio of sucrose content to the content of dry matter),%98,1-98,398,4 is 98.8
The coloration of the treated the woodworking and furniture production, services. units18,7-or 30.717,9-25,4
The period from the date of change of concentration of the woodworking and furniture production, for example, due to dilution clearaudio solution prior to recovery of the setpoint concentration, min20-2715-17

1. The method of automatic process control kierowanie sugar charcterised solution of series-connected auger and horizontal sectional cleavon the first mixer with the sugar supply to the auger, providing a flow control charcterised solution in claromeco mixer depending on the concentration of dry substances of the woodworking and furniture production, characterized in that the screw serves catholyte pH 10÷11,5, as in the first section cleavagey mixer - lime milk, and consumption of Catolica is adjusted so that in the section cleavagey stirrer, in which kierowanie lasts 4÷6 min, the concentration of solids was 12÷18%, while the consumption of milk of lime to pH in this section 10.8÷11,5, and sugar-containing solution serves in the following sections cleavagey agitators in the direction in sugar, the consumption of sugar-containing solution is regulated depending on the concentration of dry substances of the woodworking and furniture production in the last section cleavagey agitators.

2. Automatic process control kierowanie sugar sugar-containing solution in the series connected auger and horizontal sectional cleavagey stirrer with flow sugar auger containing loop stabilization of dry substance concentration of the woodworking and furniture production, including the sensor, the concentration of dry substances, characterized in that the screw is equipped with nozzles for the supply of Catolica and klenovica stirrer coupling to feed it milk of lime in the first section, and a probe concentration of solids in the account the e stabilization of dry substance concentration of the woodworking and furniture production is set in the last section cleavagey stirrers, in addition, set the control loop as the woodworking and furniture production, consisting of sensors, pH and concentration of dry substances, installed in one of the sections cleavagey agitators, flow sensor Catolica, regulators and valves, one of which is installed on the supply line lime milk and the other on the supply line of Catolica.



 

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