JPH11262400A - Controlling apparatus for cleaning step of refined sugar plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a controlling apparatus for the cleaning step of a refined sugar plant to constantly keep stable operation of the plant without relying upon the dead reckoning and experience of an operator. SOLUTION: The objective controlling apparatus for the cleaning step of a refined sugar plant having a series of individual facilities is provided with individual inlet flow rate setting means 22-27 for setting at least one of the flow rate of a carbonic acid saturation inlet port of a cleaning step, an inlet flow rate of a 1st filter, an inlet flow rate of an animal charcoal tower, an inlet flow rate of a 2nd filter, an inlet flow rate of an ion exchange resin and an inlet flow rate of a 3rd filter, a basic flow rate calculation means 40 to determine the basic flow rate by converting from a dissolved sugar quantity per unit time and the Brix value Bx of the sugar syrup in each facility, a flow rate correction means 42 to correct the basic flow rate by the sugar content of a sugar water to be added to a washed sugar, and an individual flow rate correction means 44 to correct the inlet flow rate and an outlet flow rate for each preset value of the inlet flow rate set by the individual inlet flow rate setting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a cleaning process for removing impurities in raw sugar in a refined sugar plant for producing purified sugar from raw sugar. To optimize the control of the cleaning process.

[0002]

2. Description of the Related Art A raw sugar factory produces sugar crystals of low purity using sugar cane as a raw material, and has the following eight steps. Sugar cane weighing process: Sugar cane is weighed and used as transaction data for farmers and factories. Cane squeezing step: Sugar is extracted from sugar cane to produce sugar juice. Cane sugar juice cleaning step: Separation of impurities from sugar juice and decolorization to produce a clean juice. Clean juice concentration step: Concentrate the clean juice to make a predetermined concentrated juice. Infusion process: The concentrated juice is further concentrated to form crystals. Auxiliary crystallization step: Sucrose in the solution is further separated and recovered. Honey separation process: Solid-liquid separation and drying of crystals. Product warehouse: Stores product crystals.

[0003] Raw sugar produced in a raw sugar factory is converted into purified sugar through a purification step, a crystallization step, and a packaging process for nectar products in a refined sugar factory. FIG. 5 is an explanatory diagram of the cleaning step. In the figure,
The raw sugar bin 1 is a silo that stores raw sugar. Mingra 2 is a device in which a sugar solution (syrup) is mixed with raw sugar to soften the honey film of raw sugar. The sugar washing separation 3 is a centrifugal separator that separates as little as possible the nectar portion of low purity from the crystal of sugar and wash it off, and separates it into sugar washing and honey.

[0004] The melter 4 is a mixing tank in which the sugar wash separated by the sugar wash 3 is mixed with sweet water to obtain a crude sugar solution. Here, in the case of the saturated water 5, lime milk is added to the crude sugar solution and reacted with carbon dioxide in a carbonation-saturation tower to form calcium carbonate, and impurities are aggregated in the calcium carbonate. Auto filter 6
Is a filter for obtaining a good filtrate without destroying the precipitate formed by carbonation. The bone charcoal tower 7 adsorbs pigments and other dissolved impurities using bone charcoal made by burning animal bones, and is filtered by a Danek filter 8. In the ion exchange resin tower 9, impurities remaining in the filtrate passed through the bone charcoal tower 7 and the Danek filter 8 are adsorbed and sent to the ceramic filter 10 for filtration. For details, see "t
echnology for sugar refinery workers "TATE & LYLE C
See O. (1957).

FIG. 6 is an explanatory diagram of an operation mode in a cleaning process. Raw sugar is cut out and put into the melter 4 to be sent to the RL tank 11 as a crude sugar solution. Carbonation tower 5
In the RL tank 11, the crude sugar liquid flows in, the lime milk reacts with the carbon dioxide gas, and the liquor is removed from the CL1 tank 12.
Sent to Here, the setting 21 of the raw sugar cutout amount and the carbonation saturation flow rate setting 22 are performed, and the pH sampling return amount 31 is measured. The pH is measured by
This is for keeping the sugar solution as neutral as possible. If it ’s acidic,
This is because sucrose in the sugar solution replaces the invert sugar and causes deterioration of the quality of the product, and if it is alkaline, it causes decomposition of the invert sugar.

The auto filter 6 includes a CL1 tank 12
Liquor is sent to remove the calcium carbonate adsorbing the gum-like sticky substance in the liquor and send it to the CL2 tank 13. Here, the automatic filter flow rate setting 23 is performed, and the residual amount of the auto filter liquid blow 32 is measured.
Here, a tan transparent sugar solution (brown liquor) is obtained.

[0007] Liquor is sent from the CL2 tank 13 to the bone charcoal tower 7, and the bone charcoal adsorbs impurities in the liquor, and
3 Send to tank 14. Here, the bone coal tower flow rate setting 24 is performed. The liquor is sent from the CL3 tank 14 to the Daneck filter 8, filtered, and sent to the CL4 tank 15.
Here, the Danek filter flow rate setting 25 is performed, and the Danek filter residual liquid blow amount 33 is measured.

The ion exchange resin 9 has a CL4 tank 15
And the liquor is sent to the CL5 tank 16 by adsorbing ions such as salt in the liquor. Here, the ion flow rate setting 26 is performed. The ceramic filter 10 has CL
5 The liquor is sent from the tank 16, filtered and sent to the FL tank 17. Here, the ceramic filter flow rate setting 27
Is performed, and the residual liquid blow amount of the ceramic filter is 3
4 is measured. Fine liquor of FL tank 17 is
It is a colorless, transparent, high-purity sugar solution and sent to the crystal can 18. At this time, the fine liquor concentration and the purification amount 35 as outputs of the cleaning step are measured. The fine liquor concentration is a percentage by weight of the solids representing the sugar concentration, Brix degree B.
It is represented by x.

In the cleaning process configured as described above,
Raw sugar, which is a raw material of sugar, is dissolved and turned into liquor and then purified to obtain fine liquor which is the final purified product in the cleaning step. In this cleaning step, various reaction towers, filters, tanks, and other equipment are connected in series in a single system. The system input is raw sugar cut-out, the system output is fine liquor concentration (Bx value) and purification. There is a clear causal relationship between quantities. In addition, in order to operate the cleaning process in a stable state, it is necessary to maintain the inlet flow rate of each facility and the liquid level of the buffer tank located between the facilities at stable values.

In view of the above, conventionally, a skilled operator determines the carbonation-saturation tower 5, the auto filter 6, the bone charcoal tower 7, the Danek filter 8, the ion exchange resin 9, Ceramic filter 1
An inlet flow rate of 0 was determined. The inlet flow rate is controlled by a controller provided for each facility based on the set value.

[0011]

However, in operations that depend on the intuition and experience of the operator, the ability of the operator directly affects the quality and quantity of the purified product in the cleaning process. Therefore,
There has been a problem that stable operation of the cleaning process is hindered by factors such as the change of the operator due to the shift and the change of the generation of the operator. An object of the present invention is to solve such a problem and to provide a cleaning process control device for a refined sugar plant that can always ensure stable operation without depending on intuition and experience of an operator.

[0012]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided a purification process control apparatus for a refined sugar plant, comprising: From the housed melter 4, the carbonation-saturation tower 5, the first filter 6, the bone charcoal tower 7, the second filter 8, the ion-exchange resin 9
And in the purification step of the refined sugar plant having a series of individual facilities for purifying fine liquor through the third filter 10, in the carbonation-saturated inlet flow rate, the first filter inlet flow rate, the bone coal tower inlet flow rate, 2, individual inlet flow rate setting means 22 to 27 for setting at least one of the filter inlet flow rate, the ion exchange resin inlet flow rate, and the third filter inlet flow rate, the amount of sugar per unit time and the sugar liquid of each individual equipment. The basic flow rate calculating means 40 which determines the basic flow rate by converting the flow rate from the Brix value Bx, the flow rate correcting means 42 which corrects the basic flow rate by the amount of sugar in the sweet water added to the sugar wash, and the individual inlet flow rate setting means. It is characterized by having individual flow rate correction means 44 for correcting the inflow flow rate and the outflow flow rate of each individual facility for each inlet flow rate set value.

According to the first aspect of the present invention, in the cleaning step, the melted sugar is sent from the melter 4, and the carbonation-saturation tower 5, the first filter 6, the bone charcoal tower 7, the second filter 8, the ion-exchange resin 9 Paying attention to a series of individual facilities for purifying fine liquor through the third filter 10, at least one of the individual facilities is provided with an inlet flow rate setting means. In each individual facility, flow control is performed so that the inlet flow rate becomes a set value. The basic flow rate calculating means 40 includes:
The basic flow rate is determined by converting the flow rate from the amount of sugar per unit time and the Brix value Bx of the sugar liquid of each individual facility. In this case, the basic flow rate is corrected by the flow rate correcting means 42 based on the amount of sugar in the sweet water added to the sugar wash, and the individual flow rate correcting means 4 is used.
In step 4, the inflow and outflow flow rates of each individual facility are corrected to set an inlet flow rate having specific validity.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 is a configuration block diagram showing one embodiment of the present invention. In FIG. 1, components having the same functions as those in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted. The basic flow rate calculating means 40 determines the basic flow rate by converting the flow rate from the amount of sugar per unit time and the Brix value Bx of the sugar solution of each individual facility. For example, when the amount of processed sugar per day is input by the operator, the amount of converted sugar is converted into a manageable time unit such as the amount of processed sugar per hour based on the input.

In this case, the basic flow rate may be obtained by using the density ρ with respect to the Brix value of the sugar solution. FIG. 2 is an explanatory diagram of the reciprocal of the density and the Brix value. For example, if the Brix value is 50, ρ ^-1 is 1.65 [m ³ / ton], and if the Brix value is 70, ρ ^-1 is 1.10 [m ³ / ton]. Therefore, the basic flow rate is calculated as follows. [Basic flow rate] = ρ ^-1 x [sugar content] (1)

The flow rate correcting means 42 corrects the basic flow rate based on the amount of sugar in the sweet water added to the sugar wash. Here, it is considered that the sugar content in the sweet water added to the sugar wash is proportional to the sugar content. Therefore, the corrected basic flow rate is calculated as follows. [Modified basic flow rate] = ρ ^-1 x [(amount of sugar) + (amount of sugar in sweet water added to sugar wash)] = ρ ^-1 x [(amount of sugar) + (amount of sugar) xα] ( 2)

Here, α is an added sweet water correction coefficient, which is 0.00 to
Determine within the range of 0.50. FIG. 3 is an explanatory diagram of the set inlet flow rate, the amount of sugar, and the amount of sugar in the sweet water added to the sugar wash. In the set inlet flow rate, the amount of dissolved sugar, the amount of sugar in sweet water added to the sugar wash, and the amount of extra sugar are converted into volumes. The extra-sugar content is mainly water, but also includes impurities such as honey and invert sugar.

The individual flow rate correcting means 44 corrects the inflow flow rate and the outflow flow rate of each individual facility to determine an inlet flow rate having specific validity. In consideration of the subtracted flow rate, the flow rate is controlled so that the level imbalance between the tanks does not occur. [Inlet set flow rate] = [Modified basic flow rate] + [Inflow flow rate]-[Outflow flow rate] (3)

FIG. 4 is an explanatory diagram of the inflow flow rate and the outflow flow rate of each individual facility. In the carbonation column 5, the pH sampling return amount 31 is treated as the inflow flow rate. Auto filter 6
In this case, the residual amount of the auto filter liquid blown 32 is treated as the inflow flow rate. In the Danek automatic filter 8, the Danek filter residual liquid blow amount 33 is treated as the inflow flow rate.
In the ceramic filter 10, the ceramic filter residual liquid blow amount 34 is treated as the inflow flow rate. In addition, if there is an inflow flow rate or an outflow flow rate, each facility is individually considered.

Next, the carbonation column 5, the auto filter 6,
For the equipment that measures the Brix value for the inlet set flow rate of the bone charcoal tower 7, the Daneck filter 8, the ion exchange resin 9, and the ceramic filter 10, the equation (1) may be calculated using the measured values. However, for individual equipment for which the Brix value is not measured, it is preferable to correct and use the Brix value measured by the individual equipment located immediately upstream or downstream of the individual equipment. [Bx value without process input] = ax [Measured Bx value of latest facility] + b (4) where a is 0.00 to 2.00 and −50 <b <+50.

In the above embodiment, the carbonation column 5, the auto filter 6, the bone charcoal tower 7,
Although the inlet flow rate is set for all of the Danek filter 8, the ion exchange resin 9, and the ceramic filter 10, the present invention is not limited to this.
There is no problem when setting the inlet flow rate for some facilities. In addition, in the embodiment, the inlet flow rate was calculated using the amount of the dissolved sugar, but in short, since the mass balance of the sugar was calculated, the refined amount of fine liquor and the processing amount of raw sugar and sugar washing were calculated. The amount of the processed sugar may be determined from the above.

[0022]

As described above, according to the first aspect of the present invention, there is provided a cleaning process control apparatus for a refined sugar plant.
In the cleaning step, the melted sugar is sent from the melter 4, and the carbonation-saturation tower 5, the first filter 6, the bone charcoal tower 7, the second filter 8,
Paying attention to a series of individual facilities for purifying fine liquor through the ion exchange resin 9 and the third filter 10, at least one of the individual facilities is provided with an inlet flow rate setting means for flow rate control. The basic flow rate calculating means 40 determines the basic flow rate by converting the flow rate from the amount of sugar per unit time and the Brix value Bx of the sugar solution of each individual facility. in this case,
The flow rate correcting means 42 corrects the basic flow rate according to the amount of sugar in the sweet water to be added to the sugar wash, and the individual flow rate correcting means 44 corrects the inflow flow rate and the outflow flow rate of each individual facility to have an inlet flow rate having specific validity. Since the setting is made, the entire cleaning process can be stably operated without depending on the intuition or ability of the operator. Further, since the quantity and quality of fine liquor are stabilized, the production plan becomes clear.

Preferably, when the basic flow rate calculating means uses the density ρ with respect to the Brix value of the sugar liquid, the basic flow rate calculating means can easily and accurately convert the flow rate. Here, the basic flow rate calculating means can perform accurate flow rate conversion by using the Brix value for the individual equipment having the measured Brix value. Claim 4
For individual equipment for which the Brix value is not measured as described above, if the Brix value measured by the individual equipment located immediately upstream or downstream of the individual equipment is corrected and used, relatively accurate flow rate conversion can be performed. I can do it.

Further, if the flow rate correcting means is configured to make the amount of sugar in the sweet water added to the sugar wash proportional to the amount of dissolved sugar, it is suitable for the actual operation in the premelta or the melter. Operation can be performed. Also, as in claim 6,
The individual inlet flow rate setting means is configured to use a subtraction flow rate such as a mixed flow rate of remelt or a residual liquid blow flow rate of a filter as an inflow flow rate and an outflow flow rate of each individual facility. Can be performed.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a reciprocal of a density and a Brix value.

FIG. 3 is an explanatory diagram of a set inlet flow rate, an amount of dissolved sugar, and an amount of sugar in sweet water added to sugar washing.

FIG. 4 is an explanatory diagram of an inflow flow rate and an outflow flow rate of each individual facility.

FIG. 5 is an explanatory diagram of a cleaning step.

FIG. 6 is an explanatory diagram of an operation mode in a cleaning process.

[Explanation of symbols]

 Reference Signs List 4 melter 5 carbonation-saturation tower 6 first filter (auto filter) 7 bone charcoal tower 8 second filter (Danek filter) 9 ion exchange resin 10 third filter (ceramic filter) 22-27 individual inlet flow rate setting means 40 Basic flow rate calculation means 42 Flow rate correction means 44 Individual flow rate correction means

Claims (6)

[Claims] 1. A melter (4) containing dissolved sugar obtained by dissolving a sugar wash purified from raw sugar in warm water, a carbonation-saturation tower (5), a first filter (6), a bone charcoal tower (7), In a purification step of a refined sugar plant having a series of individual facilities for purifying fine liquor through a second filter (8), an ion exchange resin (9) and a third filter (10), Individual inlet flow rate setting means (2) for setting at least one of an inlet flow rate, a first filter inlet flow rate, a bone coal tower inlet flow rate, a second filter inlet flow rate, an ion exchange resin inlet flow rate, and a third filter inlet flow rate.
2 to 27), a basic flow rate calculating means (40) for determining a basic flow rate by converting the flow rate from the amount of sugar per unit time and the Brix value (Bx) of the sugar solution of each individual equipment, and adding the sugar wash. Flow rate correction means (42) for correcting the basic flow rate based on the amount of sugar in the sweet water; and individual flow rate correction means for correcting the inflow flow rate and the outflow flow rate of each individual facility for each inlet flow rate set value of the individual inlet flow rate setting means ( 44) A cleaning process control device for a refined sugar plant, comprising: 2. The purification process control apparatus for a refined sugar plant according to claim 1, wherein said basic flow rate calculating means uses a density (ρ) with respect to a Brix value of said sugar liquid. 3. The apparatus for controlling a cleaning process of a refined sugar plant according to claim 1, wherein said basic flow rate calculating means uses the Brix value for individual equipment having the measured Brix value. 4. The basic flow rate calculating means, for an individual facility for which a Brix value is not measured, corrects and uses a Brix value measured by an individual facility located immediately upstream or downstream of the individual facility. The cleaning process control device for a refined sugar plant according to claim 1, characterized in that: 5. The apparatus according to claim 1, wherein said flow rate correcting means makes the amount of sugar in sweet water added to said sugar washing proportional to the amount of dissolved sugar. 6. The individual inlet flow rate setting means, wherein the inflow flow rate and the outflow flow rate of each individual facility are subtracted flow rates such as a mixed flow rate of a remelt or a residual liquid blow flow rate of a filter. 2. The cleaning process control device for a refined sugar plant according to 1.