JPH0116552Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a waste liquid treatment device with an improved heater temperature control system.

Conventionally, as a waste liquid treatment apparatus, one shown in FIG. 1 is known. 1 in the figure is a waste liquid storage tank that accommodates plant waste liquid. A waste liquid concentration system 3 having a concentrated liquid supply pump (not shown) is connected to this tank 1 via a first pipe 2 ₁ . When the waste liquid in the tank 1 reaches a predetermined amount, the waste liquid in the tank 1 is transferred to the waste liquid concentration system 3 and concentrated. The first pipe 2 ₁ is provided with a waste liquid feed pump 4 and first and second valves 5 ₁ and 5 ₂ . In addition, the first valve 5 ₁ and the waste liquid concentration system 3
The first pipe ₂₁ between the first and second heaters 6
₁ and 6 ₂ are provided separately from each other, and first and second temperature sensors 7 ₁ and 7 ₂ are provided corresponding to each heater 6 ₁ and 6 ₂ . Each heater 6 ₁ , 6 ₂ is connected to a heater power source 8 . Said first and second
A second pipe 2 ₂ with a third valve _{5 3 interposed} therein is connected to the first pipe 2 ₁ between the valves 5 1 and 5 ₂ , and a tank heater is connected to this second pipe 2 ₂ . A concentrate storage tank 10 with 9 is connected. A third heater 6 ₃ and a third temperature sensor 7 ₃ are provided in the second pipe 2 ₂ . The third heater 6 ₃ is connected to the heater power source 8 . The first to third temperature sensors 7 ₁ to 7 ₃ are provided with first to third heaters 6 .
Temperature control system 1 that controls the temperature of electrical circuits ₁ to 6 ₃
1 is connected. This temperature control system 11 has a function of issuing an alarm when the temperatures of the first and second pipes 2 ₁ and 2 ₂ are out of the range of approximately 60 to 70°C. Between the waste liquid concentration system 3 and the waste liquid storage tank 10,
Third piping 2 with fourth and fifth valves 5 ₄ and 5 ₅ interposed
₃ is provided. This third pipe 2 ₃ is provided with fourth and fifth heaters 6 ₄ , 6 ₅ , and fourth and fifth temperature sensors 7 ₄ , 7 ₅ corresponding to these heaters 6 ₄ , 6 ₅ . is provided. Said fourth and fifth
The third pipe 2 ₃ between the valves 5 ₄ and 5 ₅ is connected to the sixth valve 5 ₆
A fourth pipe 2 ₄ is connected thereto, and this fourth pipe 2 ₄ is connected to a drum packing system (not shown). This drum packing system includes waste liquid concentration system 3.
The concentrated processing liquid is transferred.

In the waste liquid treatment apparatus having the above-described structure, plant waste liquid is stored in the waste liquid storage tank 1, and when the waste liquid reaches a predetermined amount, the first and second valves ₅₁ and ₅₃ are opened and the waste liquid water supply pump 4 is operated. The first pipe 2 ₁
The waste liquid is then transferred to the waste liquid concentration system 3 and concentrated. The treated liquid concentrated in this waste liquid concentration system 3 is usually in the state where the fourth and sixth valves 5 ₄ and 5 ₆ are open, and the fifth valve 5 ₅
In the closed state, the liquid is transferred to the drum packing system through the third and fourth pipes 2 ₃ and 2 ₄ . At this time, if the treatment liquid cannot be received in the drum filling system, the waste liquid treatment system 3 is opened with the fifth valve 5 ₅ open and the first and sixth valves 5 ₁ and 5 ₆ closed. The processing liquid is temporarily stored in the concentrate storage tank 10 through the third pipe ₂₃ . Then, when it becomes possible to receive the processing liquid in the drum filling system, the fifth valve 55 is closed, and the third valve ₅₅ is closed.
The sixth valves 5 ₃ , 5 ₆ are opened and the treated liquid temporarily stored in the concentrated liquid storage tank 10 is transferred to the second and first pipes 2 ₂ , 2 by the concentrated liquid supply pump of the waste liquid concentration system 3 .
₁ , waste liquid concentration system 3, and third and fourth piping 2 ₃ , 2
₄ to the drum packing system. Here, the waste liquid transferred from the waste liquid storage tank 1 to the waste liquid concentration system 3 or the processing liquid transferred from the concentrated liquid storage tank 10 to the waste liquid concentration system 3 is transferred smoothly and solidified at low temperature. 1st to 3rd for the purpose of preventing
The temperature is maintained in the range of approximately 60 to 70°C by first to third heaters 6 ₁ to 6 ₃ provided in the pipes 2 ₁ to 2 ₃ , respectively. This temperature is monitored by first to third sensors 7 ₁ to 7 ₃ provided corresponding to each of the heaters 6 ₁ to 6 ₃ , and if the temperature falls outside the above temperature range, the temperature control system 11 issues an alarm. It will be done. The operator stops and resets the alarm after confirming the temperature abnormality in the electric circuit of each heater 7 ₁ to 7 ₃ based on this alarm.

However, in the waste liquid treatment apparatus described above, the waste liquid transferred from the waste liquid storage tank 1 to the waste liquid concentration system ₃ through the first pipe 21 does not need to be kept warm because it is not yet concentrated. Therefore, the temperature of the waste liquid becomes about the same as the outside temperature, and the temperature of the first pipe 2 ₁ decreases, and the first and second sensors 7 ₁ and 7 ₂ indicate "low temperature".
is detected and the system issues a “low temperature” alarm.
Therefore, the operator must first and second heaters 7 ₁ , 7 ₂
After confirming an abnormal temperature in the electric circuit, the alarm had to be stopped and reset, which placed a heavy burden on the operator. By the way, the first phase that occurs when the waste liquid is transferred from the waste liquid storage tank 1 to the waste liquid concentration system 3
The temperature drop in the pipes is not a problem for this processing system, and it is best to limit the operator's alarm checks and confirmation operations to only when there is an abnormality in the electric circuit of each heater. This is undesirable because the number of times the waste liquid is transferred from the waste liquid storage tank 1 increases, which increases the burden on the operator.

The present invention was developed in view of the above circumstances, and its purpose is to provide a waste liquid treatment device that reduces the burden on the operator by issuing an alarm only when there is an abnormality in any of the electrical circuits of the first to third heaters. It is something to do.

Hereinafter, one embodiment of the present invention will be described with reference to FIG. The waste liquid treatment apparatus of the present invention is different from the conventional apparatus shown in FIG. 1 only in the electric circuit of the temperature control system, so only the main parts will be explained. Further, the same reference numerals are used for the same members as those of the conventional device, and the description thereof will be omitted.

21 in the figure is a signal from the first valve ₅₁ .
The output of this signal 21 is "1" when the first valve ₅₁ is open and "0" when it is closed. The signal 21 of the first valve ₅₁ is sent to the OR circuit 22 and the first NOT circuit 2.
3 ₁ and output to the first AND circuit 24 ₁ respectively. The pipe temperature return signal 25 from the first temperature sensor 7 ₁ is input to the first AND circuit 24 ₁ . As shown in the time-temperature characteristic diagram of FIG. 3, this piping temperature return signal 25 indicates that the first valve ₅₁ is "open".
(time T ₁ )→“closed” (time T ₂ ), and after the temperature of the first pipe ₂₁ reaches the falling point (time T ₂ ), the predetermined temperature in the temperature control range (X ₁ to X ₂ ) The output is “0” until (time T ₃ ), and after time T ₄ (and time
The output is "1" within the temperature control range (before T ₁ ). In FIG. 3, the period from time _T1 to _T4 indicates the alarm block time, and the period from time _T2 to _T3 indicates the maximum block time. Further, the first valve 5 ₁
After passing through the first NOT circuit 23 ₁ , the signal 21 is output to the second AND circuit 24 ₂ via the timer 26 and the second NOT circuit 23 ₂ , and is also output to the second AND circuit 24 ₂ . is the signal from the OR circuit 22 and the first AND circuit ₂₄₁ to the third
The signals obtained from the NOT circuit 23 _{and 3} are respectively output. Note that the timer 26 operates from the time the first valve 5 ₁ closes until the temperature of the first pipe 2 ₁ reaches the temperature control range, and the output from the timer 26 when the signal is activated is "0". , the output when stopped is "1". The signal from the second AND circuit 24 ₂ is output to the OR circuit 22, the first AND circuit 24 ₁ , and the lamp 27, respectively. The lamp 27 is
The signal output from the second AND circuit ₂₄₂ is “1”
Lights up only when the alarm is blocked. The signal from the second AND circuit ₂₄₂ is connected to the fourth NOT
The signal 28 from the first temperature sensor 7 1 is output to the third AND circuit 24 ₃ via the circuit 23 ₂ , and the signal 28 from the first temperature sensor _{7 1 is} input to the third AND circuit 24 3 . In the electric circuit of such a temperature control system, the second
From the AND circuit 24 ₂ to the OR circuit 22
The wiring returning to the AND circuit ₂₄₂ forms a self-hold circuit. That is, if the output of the signal 21 of the first valve ₅₁ is "1", the second and third NOT circuits 2
The output of either signal from 3 ₂ or 23 ₃ is “0”
Unless otherwise, the signal output from the second AND circuit 24 ₂ will be "1". Then, the first valve 5
Even if the output of the signal ₁ becomes "0", the output of the signal of the OR circuit 22 is held "1" by the self-hold circuit, and the second and third NOT circuits 23 ₂ , 23
The self-hold is released only when the output of at least one of the respective signals from ₃ becomes "0". Although the above circuit is shown in logic representation,
Specifically, relays, sequencers, etc. are used.

In the waste liquid treatment apparatus having the temperature control system of the circuit described above, the first temperature sensor ₇₁ indicates "low temperature".
When detected, whether or not an alarm is issued is determined depending on the open/closed state of the first valve ₅₁ .

(1) If the first valve 5 ₁ is “open” (output “1”),
The signal output from the OR circuit 22 becomes "1", and the signal output from the second AND circuit ₂₄₂ becomes "1" due to the self-hold circuit. Therefore, the output of the signal from the fourth NOT circuit ₂₃₄ is "0", and even if the output of the signal 28 from the first temperature sensor ₇₁ is "1", the output of the signal from the fourth NOT circuit 234 is "1".
The signal output from the AND circuit ₂₄₃ is "0" and no alarm is issued. Note that the lamp 27 is lit because the output of the signal from the second AND circuit 24 ₂ is "1".

(2) When the first valve 5 ₁ closes (output “0”), the first
NOT circuit 23 ₁ signal output is “1”, 2nd signal output is “1”,
The output of the signal of the AND circuit 24 ₂ is set to “1” by the self-hold circuit, and further the output of the signal of the first temperature sensor 7 ₁
Since the output of the pipe temperature return signal 25 is "0", the output of the signal of the first AND circuit ₂₄₁ is "0". Here, the timer 26 operates, and the concentrated waste liquid temporarily stored in the concentrated liquid storage tank 10 is transferred to the waste liquid concentration systems 3, 3, and 4.
It is transferred to the drum packing system via piping 2 ₃ and 2 ₄ . Note that the setting time of this timer 26 is the first
This is the time it takes for the temperature of the pipe ₂₁ to return to the controlled temperature range, and the timer 26 is set by operating the first heater ₆₁ in advance depending on the capacity and heat retention status of the first heater 61. While the timer 26 is operating, the output of the signal of the timer 26 is "0", so the output of the signal of the _second NOT circuit 232 is "1", and the output of the signal of the second AND circuit is "1". continue. Therefore, the output of the signal from the fourth NOT circuit ₂₃₄ becomes "0", and the output of the signal 28 from the first temperature sensor ₇₁ becomes "1".
Even if it is, the signal output of the third AND circuit ₂₄₃ becomes "0" and no alarm is issued. Note that the lamp 27 lights up when the output of the signal 28 from the temperature sensor 7 ₁ is either "1" or "0".

(3) When the signal output of the first valve 5 ₁ is “0”,
When the timer 26 stops operating, the timer 2
The output of signal 6 becomes “1” and the second NOT
The output of circuit ₂₃₂ becomes “0” and the second AND
The signal output from the circuit ₂₄₂ becomes "0". As a result, the lamp 27 goes out and the fourth
The signal output of the NOT circuit ₂₃₄ becomes "1".
Therefore, if the signal 28 from the first temperature sensor ₇₁ is "temperature low" (output "1"), the third
The signal output of the AND circuit ₂₄₃ becomes "1" and an alarm is issued.

On the other hand, the output of the signal 21 of the first valve ₅₁ is “0”
Even if the timer 26 is in operation,
When the temperature recovery signal becomes "1", the output of the first AND circuit 24 ₁ becomes "1", the output of the third NOT circuit 23 ₃ becomes "0", and the output of the second AND circuit 24 ₂ becomes "0". The output of becomes "0". At this time, since the temperature has returned to normal, the signal 28 from the first temperature sensor ₇₁ is "0", and the third AND circuit ₂₄₃
The signal output remains “0” and no alarm is issued. In other words, the set time of the timer 26 is the maximum blocking time, but if the temperature returns within this time, the alarm block will be canceled. Here,
The maximum block time is the maximum allowable alarm block time, and a temperature return signal is used so that the alarm block can be canceled quickly.

Although the case of the first heater 7 ₁ has been described above, the same applies to the cases of the second and third heaters 7 ₂ and 7 ₃ .

According to the above-mentioned waste liquid treatment device, since it is possible to detect true abnormalities in the first to third heaters 7 ₁ to 7 3 , only the abnormalities in the first to third heaters 7 ₁ to _{7 3 are} alarmed. can be emitted. Therefore, in the case of this device, the burden on the operator can be reduced compared to the conventional method.

In the above embodiment, the opening/closing signal of the first valve is input to the OR circuit, but the present invention is not limited to this, and the starting signal of the waste liquid feed water pump that operates in synchronization with the first valve may be input to the OR circuit. Good too.

As described in detail above, according to the present invention, it is possible to provide a waste liquid treatment device that reduces the burden on the operator.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional waste liquid treatment apparatus, FIG. 2 is an explanatory diagram showing the circuit of the temperature control system of the waste liquid treatment apparatus of the present invention, and FIG. FIG. 3 is a time-temperature characteristic diagram of the piping. 1... Waste liquid storage tank, 2 ₁ to 2 ₄ ... Piping, 3
...Waste liquid concentration system, 4...Waste liquid water supply pump, 5 ₁ ~
5 ₆ ... Valve, 6 ₁ to 6 ₄ ... Heater, 7 ₁ to 7 ₅ ...
Temperature sensor, 10... Concentrate storage tank, 11...
... Temperature control system, 21 ... Signal from first valve, 2
2...OR circuit, 23 ₁ to 23 ₄ ...NOT circuit, 2
4 ₁ to 24 ₃ ... AND circuit, 25 ... Piping temperature return signal from the first temperature sensor, 26 ... Timer, 27 ... Lamp, 28 ... Signal from the first temperature sensor.

Claims (1)

[Scope of utility model registration request] a waste liquid storage tank, a first pipe connected to this tank and having first and second valves interposed therein;
a waste liquid concentration system connected to the tank via a pipe, and first and second heaters sequentially provided in the first pipe between the first valve and the waste liquid concentration system;
first and second temperature sensors provided in the piping so as to correspond to the first and second heaters;
a second pipe connected to the first pipe between the second valves and interposed with a third heater and a third temperature sensor;
A concentrated liquid storage tank connected to the first pipe via this second pipe, a temperature control system connected to the first to third temperature sensors, and a connection between the waste liquid concentration system and the concentrated liquid storage tank. In the waste liquid treatment apparatus, the temperature control system includes an OR circuit into which a signal from the first valve is input, and a signal from the first valve through the first NOT circuit. A first AND circuit into which pipe temperature return signals from the first to third temperature sensors are input;
a third NOT circuit into which a signal from the circuit is input;
A signal is input from the first valve through the first NOT circuit, and from the time when the first to third valves close until the first to third piping provided for each valve reaches the temperature control range. A timer that operates, a signal that has passed through this timer and the second NOT circuit is input, and
The second output is output to the OR circuit and the first AND circuit, respectively.
AND circuit and a fourth circuit from this second AND circuit.
A waste liquid treatment device comprising a third AND circuit into which signals passed through the NOT circuit and signals from the first to third temperature sensors are respectively input.