JPH0735599Y2 - Control device for sugar solution heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sugar solution heater control device applied in a sugar factory, and more specifically, in a step of heating sugar solution through a plurality of heaters. , If the scale adheres to the heating part of the heater, the heat conduction will decrease, so the heater will be switched to the spare heater and the heater with the scale adhered will be washed. At this time, switching control to the spare heater will be performed. The present invention relates to a sugar liquid heater control device capable of effectively performing the above.

<Prior Art> FIG. 4 is a conceptual diagram showing a heating process of a sugar solution in a sugar factory.

In the figure, 1 is a primary heater (heater) into which a sugar solution is introduced, and here, for example, a sugar solution at 20 ° C. is heated to 80 ° C. 2 is, for example, a sugar solution at 75 ° C into which lime milk has been added
The secondary heater 3 that heats up to 95 ° C. is a preheater that heats the sugar solution at 95 ° C. to 105 ° C. that is introduced through the clarifier 4, and the sugar solution output from this is introduced to an effect can (not shown). It

5 is a spare heater, only one is shown here,
There are cases where multiple heaters are provided, and if the scale adheres to the heating part of each heater 1, 2, and 3 and heat conduction deteriorates, switch to a spare heater, and the scale will adhere during that time. It is configured so that the heating portion of the heater having poor heat conduction can be washed.

<Problems to be solved by the invention> In such a sugar solution heating process in a sugar factory, when the flow of the sugar solution is switched to a spare heater to clean the heating part, the preset temperature of the spare heater is washed. It is necessary to set the temperature to be the same as the set temperature (outlet temperature) of the heater that is the target of the above.

In the conventional device, the setting of the heating temperature of the auxiliary heater at the time of such switching is manually performed by the operator each time the switching is performed.

However, the temperature setting by the operator has been a problem not only in increasing the burden on the operator but also in easily making a mistake in setting or forgetting the setting and maintaining the reliability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a control device for a sugar solution heater that reduces the burden on the operator and can automatically switch to a spare heater.

<Means for Solving the Problems> The present invention that achieves such an object is provided with a plurality of heaters for heating a sugar solution and a switching connection in parallel with any one of these heaters. A controller for a sugar solution heater including a spare heater, which reads the set temperature of any of the plurality of heaters to be switched when switching to the spare heater. A set value reading means and a temperature adjusting means for controlling the temperature of the auxiliary heater based on the set temperature read by the set value reading means are provided.

<Operation> When a need arises to wash one of the heating units of the plurality of heating units, the auxiliary heating unit is connected instead of the heating unit, and the sugar solution is flown therein.

The setting value reading means reads the temperature setting value given to the temperature adjusting means of the heater which is the cleaning target removed from the heating step for cleaning at the time of switching,
It is given as a temperature set value to the temperature adjusting means of the spare heater.

The preliminary heater participates in the heating process and heats the introduced sugar solution at a set temperature.

<Embodiment> An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In this embodiment, three heaters (heaters) 11 to No. 1 to No. 3 are used.
There is 13 and this shows an example in which one spare heater 5 is prepared. Each of the heaters 11 to 13 is shown here as introducing sugar solution 1 to sugar solution 3, respectively. However, each of these sugar solutions is, for example, sugar solution 2 as described in the section of the conventional example.
Is the one after the lime milk has been added to the sugar liquid output from the primary heater, and the sugar liquid 3 has a relationship such that it indicates the sugar liquid discharged from the clarifier.

V1 to V12 are all valves that switch the flow of sugar solution to each heater. C1 ~ C3, Co is a temperature control means for inputting the temperature signal of the sugar solution output from the outlets of the heaters 1 to 3, 4 to control the heating temperature by the heater, for example, a PID controller is used, In this example, the control output is adapted to control the amount of steam supplied to the heater, and is configured to control the heating temperature by the heater.

6 is a setting means for giving a set value signal SV as a temperature control target to each of the temperature adjusting means C1 to C3, and 7 is an object of switching when the sugar solution is introduced into the auxiliary heater 15. With the set value reading means for reading the set temperature of the heater, the set value signal SV read here is provided as the set value of the temperature adjusting means Co for controlling the heating temperature of the auxiliary heater 15. ing.

The operation of the apparatus thus configured will be described below.

FIG. 2 is a flowchart showing an example of the operation. In this example, it is assumed that the scale adheres to the heating part of the No. 1 heater 1 and the heater needs to be cleaned.

In this case, the valves V1 and V2 provided at the inlet and the outlet of the heater 11 are closed, respectively, and at the same time, the valve V7 connected to the inlet of the auxiliary heater 15 and the valve V8 connected to the outlet are opened. Although not shown, the opening / closing control of these valves is performed by a sequencer for valve control, and is gradually switched so that the pressure or the like in the pipeline does not fluctuate significantly. As a result, the sugar solution previously introduced into the heater 11 is introduced into the spare heater 15 side.

Subsequently, the set value signal reading means 7 is a temperature adjusting means C1 for controlling the heating temperature of the No. 1 heater at the time of this switching.
Read the temperature set value SV1 given to. Then, this temperature set value SV1 is given as the temperature set value SV4 of the temperature adjusting means Co. The temperature adjusting means Co thereafter starts the temperature control of the preliminary heater 15 based on this temperature set value.

In such a state, the cleaning sequence of the heater 11 is performed. When the cleaning sequence ends, the valves V1 and V2 are opened and the valves V7 and V8 are closed to restore the original state.

The above description is for cleaning the heater 11, but when cleaning the heater 12 or 13, in the same manner, opening and closing the valve at the inlet and outlet of the heater and opening the valve connected to the spare heater. This can be done by selectively controlling opening and closing.

FIG. 3 is a block diagram showing the construction of the essential parts of another embodiment of the present invention.

In this embodiment, the heating temperature adjusting means C1 of each of the heaters 11 to 13 is used.
Setter SD1 that applies set value signals SV1 to SV3 to C3 to C3, respectively
To SD3 are separately provided, a changeover switch is used as the set value reading means 7, and the changed signal is given as the set value signal of the temperature adjusting means Co.

In this case, the changeover switch as the set value reading means 7 is configured to operate in conjunction with the valve changeover sequence.

In the above embodiments, the case where three heaters are used has been illustrated, but the present invention can be applied to a system in which a larger number of heaters are provided, and the number of spare heaters should be increased accordingly. Good. In the above description, the case of controlling the heating of the sugar solution is taken as an example, but the present invention is not limited to this, and can be applied to any process as long as it is a process of controlling heating.

<Effect of Device> As described in detail above, according to the present invention, the flow of the sugar solution is switched to the spare heater side, and at the same time, the temperature set value of the temperature adjusting means of the spare heater is switched. It is automatically set to the same setting temperature as the target heater,
Not only can you reduce the burden on the operator,
Reliability can be improved by not forgetting settings.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flow chart showing an example of the operation, FIG. 3 is a block diagram of a main part showing another embodiment of the present invention, and FIG. It is a conceptual diagram which shows the heating process of the sugar liquid in a sugar factory. 11 to 13 …… No.1 to No.3 heaters (heaters) 15 …… Spare heaters 6 …… Setting means 7 …… Set value reading means C1 to C3, Co …… Temperature control means V1 to V12 ……valve

Claims (1)

[Scope of utility model registration request] 1. A control device for a sugar solution heater comprising a plurality of heaters for heating a sugar solution and a spare heater which is switchably connected in parallel to any one of these heaters. In addition, at the time of switching to the auxiliary heater, a set value reading means for reading the set temperature of any one of the plurality of heaters which has been switched, and a setting read by this set value reading means. And a temperature adjusting means for controlling the heating temperature of the auxiliary heater based on the temperature, the controller for the sugar solution heater.