PL91705B1 - - Google Patents

Description

The subject of the invention is a device for regulating the process of crystallization of the sugar solution in the boiler is running intermittently.

It is known from the German designation description No. 1812457 apparatus for regulating the crystal process position, in which the value is proportional to the change Saturation is determined from temperature and negative pressure what prevails in the boiler. Compare this value varies with the set value and depending on the output the regulator by changing the change accordingly control valve, regulates the water supply. After obtaining the desired degree of crystallization of the regulator the track is switched, namely to deviation regulation that occurs between the measured voltage the value of the crystals and the set value, add niona from the fill level. Now depending ci from the actual control deviation, regulator it affects the syrup introduction valve.

With this method of regulation, it may happen that that more water will be drawn in than it is without relatively necessary.

The object of the invention is to shape the character in such a way device so that only enough jackpot is pulled how much is strictly necessary to carry out pairing process.

This aim was achieved according to the invention of in such a way that the level measuring sensor and the sensor the programmer of the set field level value they are connected to the limit value indicator, which depending on its initial state, rice links ao regulator with an adjuster to change the quantity you pulled syrup or pulled water.

In this way it is ensured that the automatic system ki in the overwhelming amount of its uses still only syrup, and for all other additions In any event, it does not have to be disabled more water is evaporated than is necessary for obtaining a predetermined brewing time for the task evaporation power.

Often used control systems in which as the leading value of the brewing process in In the crystal growth phase of up to 25%, viscosity is used bone, and in the phases of intense boiling and steaming nations - consistencies, bringing them into form c and measured values to the controller. In office This kind of regulatory action is beneficial raising the set viscosity value in a manner programmed so that the change of room dependency between the viscosity and supersaturation is compensated important and the set value for the consistency changes itself depending on the entrusted thing a real increase in height.

In addition, the set value for the consistency is is preferably carried out outside of time intensive it is brewed, that is, during the breaks in the operation of the regulator additionally from the measured value of the consistency actual. Like this on the one hand a smooth transition from the growth phase is achieved 0-25% to the intensive boiling phase and to the second 9170591705 hand also switch phases without the need manual equalization of the condition.

The subject matter of the invention is reproduced in, for example, the embodiment in the drawing in which fig. 1 shows a graph of an automated process crystallization, and Fig. 2 is a block diagram of the system automatic process control.

As shown in the figure (Fig. 1) on the timeline the measured viscosity courses are plotted, a, consist b state of the height of the water in the digester c.

At this time, the effect of the syrup begins nika. At the moment the heater fills with syrup and the syrup feed control valve 5 closes always after filling the heating chamber same height condition. In the time interval tl— 12 the thickening of the sugar solution is carried out until the supersaturation number, which lies for the seed in za¬ in the metastable range, and for vaccination in the range indirect. At time t2 or is introduced implants a certain amount of seed crystals.

In the time interval t2-13, the crystals grow from zero ra to about 25 * Vo; here a steady flow is achieved by introducing syrup or by accident special tiles by introducing water.

The height gain when introducing the syrup is supervised and restricted.

Supersaturation is measured by measuring the viscosity a. In the time interval t3-14 there is the in phase intensive brewing in which the original volume the guiding bone is the content of the crystals. Determ it is weakened by measuring the consistency of b, which the setpoint is raised by adjustable response correspondingly to the increase in the level. In the time frame t4-15 contains the evaporation phase in which the maximum height condition and the end of the or putting syrup. At time t5 occurs end of brewing, indicated by a limit signal consistency and signaled. Then air shakes and the finished war is lowered into the mash.

In the time interval t6-17, the cooker prepares to a new condition, for example, it scalds, cops them and empty them.

The figure (Fig. 2) shows a more detailed diagram regulation.

For measuring viscosity and consistency when brewed in A cylindrical sensor is used for measuring the mass from the digester 1 ditch 2. Height c of the brewed mass in the value 1 is determined by the sensor for measuring the contact level 3, which outputs an electric signal ny according to each state. Viscosity or the consistency of the brewed mass is defined by by means of a cylindrical sensor 2 rotating at syrup or steamed mass, powered by a spring and measuring. The rotation angle resulting from vapor moment of the brewed mass between na¬ pedal and cylindrical sensor is the ground re of viscosity or consistency. To be able to ob¬ it measures a wide range from start to finish all the brewing process and at the same time keep enough very high sensitivity and accuracy of measurement at viscosities in the range of 60-400 cP, two springs the measuring leads are made with different commonality stiffness factors. Sensitive measuring spring forms a counter torque in the field of viscosity measurements bones and the sum of the action of both springs - against moment when measuring the consistency.

Each rotation angle is processed in June of the amplifying force 4 per measuring quantity of the elec tics and the output signal carries the sensor through the channel measuring instrument as a signal of consistency b. Z the output signal is then cut by half power of the electric threshold stage signal range tincture corresponding to 60-400 cP, strengthens and inputs to the second channel as a measurement signal ditch viscosity. To the diagrammatic no hot water boiler 1, heated steam can introduce or introduce syrup through the regulating valve 5, or water through the control valve 6. Visc bone a, consistency b and height c register they are eaten on a regular basis with a flat pen 26.

Further on, the altitude state measurement values, the viscosity ci and consistency is used in steady lights boundary moons 27-31 for specific signaling states.

For example, activation of the game status indicator 27 means "heater filled", signal lysator 28 - "seed point reached" signal lyser 29 "intense boiling", indicator 30 - "evaporation" and signaling device 31 - "War go ts ". These values are entered for control and output uses to work out the appropriate orders call so that the device switches progressively throughout the cycle.

Viscosity signal proportional to supersaturation is taken to comparison 8 and hereafter equates to the value of the float set for the viscosity set from the setter 25. The set value is at hay set to the supersaturation value lying in a metastable zone in which the brewed mass is should be adjusted at the beginning of the process for by a 9-segment operating through a regulator of the valve 7 which controls the control valves syrup 5 or water 6. If this is the case and The crystal seed was introduced into the cultivars ka, it changes as a result of this growing crystals in the syrup and the dependence of the city between the measured value of the viscosity of the brewed mass and supersaturation of inter-crystal syrup. No unnecessary correction is carried out continuously increasing the set value of the viscosity. Including this At time t4, the engine setting is started set value 18, 19 of the program transmitter, which controls connected to it at a certain time the potentiometer evenly from the starting position to the final. ¦ 50 Measuring amplifier 29 of the program transmitter transforms the change of the potentiometer resistance to the change of current, which is multiplied into a pattern day of the multiplier 10 with an adjustable pledgee 55 of the value set by the viscosity gradient as depended from time, increasing additional voltage signal y is added to the command for correction viscosity values. Regulatory error created at the point of comparison, 8 works in this phase after 60 via the regulator 9 and the positioning member 7 to the downstream valve flow of syrup 5 and thus keeps it flowing saturation of the right value.

During the intensive brewing phase, the adjustment of the operation always on the syrup inlet valve 5, and in the in the articular blood from 0-25% of the crystal content 405 lead at equilibrium between de-sugar and evaporation power.

If the balance between de-sugar and fall off in the growth phase from 0-25% transition will be permanently disrupted, especially in the 5th this way that de-sugar cannot proceed by means of evaporation, this state stands out in the resulting course of crystallization too the large increase in height of the brewed butter sy in booster 1. Then appliance 10 starts up security that is concerned so that also not with great brew, too much intensity pairing or introducing too hard the process was not beyond the end of the pressed syrup process the troll and the assumed brewing time was kept. ls Thereby it is achieved that in no case must I? more water is evaporated than it is half needed to achieve the desired brewing time at a specific intensity of evaporation. Authority safety operation by supervising and 20 possible stop of the measured set point increase of the crystallization height in the rising phase until intense boiling.

The motorized setting is used for this purpose setpoint 18, 19 of program transmitter 25 which is provided via the measuring amplifier 20 Rising time, depending on the time of the work signal which is subject to multiplication with the game The temperature of the height of the brewed mass was reached connected by the setter 33 to the multiplier 30 11 program transmitter. These so formed, dependent Increasing set value from time and program nu heights are compared in terms of comparison 12 with the actual value measured by the sensor the height level 3 and brings the difference to 35 limit value indicator 14 operative as an altitude limiter. The latter is not it works as long as the real altitude the brewed mass will not exceed the set value according to the time schedule. However, if it is on- 40 fuses, limit value 14 fuses It connects the regulator 9 through the switch 22 and the switch on 7 ponds has a water inlet valve 6 for as long until the set and measured values are equal.

The same signal 45 when there is a need the cutoff value 14 becomes via commutative connection to the syrup feed and regulator water rem of the level increment. So that you save when changing take the same setting, note that for for both control valves 5 and 6, the 100 M is essential displacement ratio resulting from the juice concentration. Za¬ instead of a double-barreled warning light limit value, you can also apply the rule Continuously acting, changing the ratio to pond for water and syrup. In this dose of the process, we are 55 steppe caring to develop established seeds with precise maintenance of supersaturation by o- written above as regulations.

With the increasing size of the crystals, it grows into them more specifically the storage area 60 crystals that continue to crystallize itself takes over more and more regulatory functions affecting the supersaturation of the brewed mass. Here can be made from a certain point in time after entering the blank when sowing, adjust the content of yen crystals 6 sli will certainly find that on the one hand the free movement of the crystals in the syrup is not on the other hand, also the measurement intervals between the crystals in the brewed mass are not too large that. This is possible through maintenance and regulation correct value of the consistency of the brewed mass.

From the above it follows that a change in the size of the village giving in the process, viscosity and consistency is not relatively critical, change may be undertaken depending on the consistency or time and in the process is approximately at the beginning of the phase of intensive brewing. Arrangement according to the invention the switch is arranged so that the switch 21 may not that be toggled by the "value" siren limit 29 so that the control of the con¬ systency.

In order to regulate the consistency, w point of comparison 13 signal proportional to of the measured consistency b with the signal of the desired consistency systems from the motorized positioner the set value 16, 17. To include input that must be entered into the set point consistency as a signal dependent on the increase in consistency filling mass level, proportional signal to the measured altitude state, he introduces himself with the on-value supplied with the adjuster given 24 by a signal of a consistency gradient to the bend the multiplication du 34 and the result of the multiplication introduces in the form of the setpoint correction signal to point of comparison 15. Here, the operation signal is created Ia via the regulator 9 exclusively on the regulating valve lation of syrup 4.

As it is just described the regulatory error, "Con the function is entered into the controller 9 from the start stage of the "Intensive Brewing" process, why is accompanied by the switching of switch 21. Simultaneously However, it is not possible to give the adjustment handle constantly to the 3-position switch 15, which always when the consistency control is ineffective on it leads through the switch 23 on the engine set value factor 16, 17 for consistency in the footsteps of its actual value, keeping zero regulatory error between consistency set and actual. It's self-guiding Trackers allow a smooth and undisturbed transition from adjusting the viscosity to adjusting the consistency on the one hand, and on the other hand, it has a switch without manual alignment when reaching "u- boiling.

Summing up, the following re¬ gulation of the crystallization process.

First it is dosed via the inflow regulator dependence on the original regulatory value "Supersaturation", which is measured indirectly as viscosity by viscosity sensor and consistency. Find supersaturation (lightness) changes with increasing za¬ the value of the crystals. Necessary for this reason there is a correction to change this relationship to the supersaturation setpoint.

After filling to the "radiator cover" condition the syrup thickens to the point of seeding or to the point foaming, according to the curves appropriate to the foam measured sowing or vaccination. Regulator it leads supersaturation from the initial value of ON given by the viscosity gradient set 91705 8 growth so that in the growth phase of crystals from 0—25 * / o supersaturation remains at the specified values. . In this phase of crystal growth, from 0 to 25% pro moreover, it is also useful to monitor the increase in output juice. A comparison of values is used for this set and measured bones leading to the formation Regarded control errors to the alarm indicator limit values, which when the value is too high the actual value activates the flow controller water, and if the actual value is too low - for the juice feed. By maintaining the steep the valves of juice and water in relation to u- the division of the water in the syrup to strengthen the circuit re¬ gulation remains constant. Except for such a solution the achieved control deviation can be led to the regulator of continuous operation, which depending on those from this error change continuously the stack setting foot for syrup and water inlet valves.

For this, for example, the output signal re¬ supersaturation regulator to be passed through half a tennometer whose motor drive is adjustable from a proportional height regulator depending on the error of regulation, from this potential ciometer, it is possible to obtain voltages that transfer shaped in the amplifiers for the currents of the branch wujace on both control valves via na¬ electropneumatic positioners. 21 With about 25% of the crystals content * he determined a signal dependent on time and consistency, the sensor switches to the content of crystals (conc systency). By keeping a set value the consistency of the measured value is obtained smooth switching behavior. Set value for consistency is carried out depending on the state the height of the brewed mass and the set gradient here the altitude status.

Claims (1)

1. Patent claim A device for regulating the process of crystallization of a sugar solution in a discontinuously working digester having an adjuster to change the amount of syrup drawn in, an adjuster to change the amount of drawn water and a regulator that can be connected to these adjusters, to which on the input side is The overload sensor and the set point adjuster are connected to the mains, and which also has a weighing mass level sensor, characterized by the fact that the measuring sensor (3) for the level of the brewed mass and the sensor of the program transmitter (11) They are connected to a limit value switch (14) which, depending on its state, connects the regulator (9) with the adjusters (5, 6, 7) to change the amount of syrup taken or the amount of water drawn in. LLM e. v? ~ o ni .a \ \ d u> r? L • £? ^ i. J = "- £> U) UW ^ Isl! Q LZG Z-d No. 2 order 567/77 100 copies A4 Price PLN 10