JPH0675640A - Device and method for tank switching control - Google Patents

Abstract

PURPOSE:To provide the device and method which can remotely confirm that when the sending destination of liquid is switched from one tank to the other tank, remotely operated valves provided on the liquid sending path to the latter tank are surely open. CONSTITUTION:The device and method are equipped with a liquid level storage and comparison device which stores liquid level positions inputted from liquid gauges 16 and 18 provided on the tanks 12 and 14 and the input time and compares liquid level positions at an optional point of time with previously set reference liquid level positions and a valve controller 34 which controls the opening and closing of the remotely operated valves 30 and 32, outputs a signal showing that a closing command for the remotely operated valves is sent to the device 24, and inputs the comparison result from the device 24. Then when the tanks are switched, it can remotely be confirmed that the remotely operated valve on the tank side where liquid is newly sent out is surely closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tank switching control device for a liquid tank, and more particularly to a product switching from a product tank to another product tank while the product liquid is being sent from the manufacturing device to the product tank. When switching the delivery destination of the liquid,
Alternatively, when switching the liquid storage tank between tanks, the delivery route of the product liquid or liquid from the manufacturing position to another product tank or from one storage tank to another storage tank is surely switched and established. The present invention also relates to a device for confirming that
It relates to a method of switching tanks while confirming that the delivery route of the product liquid or liquid from the manufacturing equipment to another product tank or from one storage tank to another storage tank is surely switched and established. is there. Further, it can be similarly used when supplying a liquid such as a raw material from a storage tank to a manufacturing apparatus or the like.

[0002]

2. Description of the Related Art In a tank group for storing a liquid, for example, in an off-site tank group of a refinery, a conventional tank switching method is to send product oil from an oil refining device to a product tank. When switching the destination of product oil from one product tank to another product tank when the product oil is present, an open command is issued to the remote operation valve provided in the product oil introduction pipe to another product tank, and the remote operation valve After receiving the answerback signal from the limit switch, the remote control valve provided in the product oil introduction pipe to one product tank was issued a close command. The same was applied to the case of supplying from a storage tank for raw materials or the like to a raw material supplier such as oil refining.

[0003]

However, in the conventional tank switching system, although the answer back signal of the limit switch of the remote control valve provided in the product oil introduction pipe to another product tank is received, In the unlikely event that this is a malfunction of the limit switch of the remote control valve, and the remote control valve remains closed, close the remote control valve provided in the product oil introduction pipe to one product tank. In this case, since the product oil introduction pipes to both product tanks are closed, it becomes impossible to immediately deliver the product oil from the oil refining equipment, and the operation of the oil refining equipment must be stopped. It could have led to a situation in which it was not possible to obtain. Similarly, when supplying the feedstock oil, the supply could be stopped and the oil refining equipment would be shut down. The operation reliability of the limit switch of the remote control valve is not always perfect, and there are few occasions to confirm the opening / closing operation of the remote control valve, and there was no guarantee that the above situation would never occur. Therefore, the operator used to go to the place where the remote control valve was installed far away, confirm that one remote control valve was open, and then close the other remote control valve for the first time. . For this reason, it was impossible to switch the tanks quickly while placing a heavy burden on the operator.

In view of the above problems, it is the first object of the present invention.
When switching the liquid delivery destination or supply source from one tank to another tank, make sure that the remote control valve provided in the liquid delivery route or supply route to another tank is open. It is to provide a tank switching control device that can be remotely confirmed, and secondly to provide a method that can also be remotely confirmed.

[0005]

In order to achieve the above object, a tank switching control device according to the present invention is provided with a liquid level position of a stored liquid input from a liquid level gauge provided in each of a plurality of tanks, and its position. The input time is stored, and the liquid level position of the stored liquid at any time is estimated based on the stored liquid level position,
Further, a liquid level memory-comparing device for comparing the liquid level position at the arbitrary time point with a preset reference liquid level position, and controlling the opening / closing of a remote control valve provided in a pipe leading to each tank, A valve control device that outputs a signal indicating that a command to open a remote-controlled valve has been issued to the liquid level memory-comparison device, and that receives the comparison result from the liquid level memory-comparison device. And

In the present invention, the reference liquid surface position can be arbitrarily set, but the valve control device is the second remote control valve provided in the liquid introduction pipe to the second tank or the supply pipe from the tank. A value obtained by adding an arbitrary + α or −α to the liquid surface position of the second tank at the time of issuing the opening command for opening the reference liquid surface position. The liquid level gauge in the present invention is a commercially available liquid level gauge equipped with an output device that detects the position of the liquid level and outputs a signal of the detected value. The remote operated valve is a commercially available remote operated valve whose valve is opened and closed by an electric motor or a fluid pressure device operated by a control signal transmitted from a remote place. The liquid level storage-comparison device used in the present invention is a memory that stores the liquid level position input from a liquid level gauge and its input time, and the liquid level position at an arbitrary input time stored in the memory. Is called, and it is compared with a preset reference liquid surface position, and the calculation-output means for outputting the comparison result is a general apparatus.

With the above configuration, in the tank switching control device according to the present invention, when the liquid is introduced from the equipment such as the oil refining device to the tank, the valve control device is provided in the liquid introduction pipe to the first tank. Issuing the closing command to close the first remote control valve that is set, the liquid level position of the liquid in the second tank input from the liquid level gauge provided in the second tank is the same as the reference liquid level position. , Or when it is confirmed that the liquid has risen to a higher position, that is, the remote control valve provided in the liquid introduction pipe to the second tank is open, and the liquid passes through the liquid introduction pipe to the second position. It can be limited to the case where it is confirmed that the liquid level in the second tank has actually risen by flowing into the second tank. Therefore, accidentally add liquid to the first tank to the second
It will no longer be possible to send it to the tank and the operation of the device will have to be stopped.

Further, when the liquid is supplied from the tank to the equipment such as the oil refining device, the valve control device closes the first remote control valve provided in the liquid supply pipe to the first tank. Check that the liquid level position of the liquid in the second tank entered from the liquid level gauge provided in the second tank is the same as or lower than the reference liquid level position. In other words, that is, when the remote control valve provided in the liquid supply pipe to the second tank is opened, the liquid flows out of the second tank through the liquid supply pipe, and the liquid level of the second tank is increased. It can only be done when it is confirmed that is actually falling. Therefore, it is possible to prevent the situation in which the liquid cannot be erroneously supplied from the first tank or the second tank, and the operation of the apparatus is forced to be stopped.

Further, in the tank switching control method according to the present invention, when the liquid is introduced into the tank from equipment such as an oil refining device, the destination of the liquid being sent is changed from the first tank to the second tank. When switching, the opening command is issued to the second remote control valve provided in the liquid introduction pipe to the second tank, and at the same time, the liquid level position of the second tank when the opening command is issued is changed. , Estimated based on the liquid level position of the second tank that has been already input and stored from the liquid level gauge provided in the second tank, and further estimated the liquid level position of the second tank Is set as a reference liquid level position, and after a predetermined time, the liquid level input from the liquid level gauge provided in the second tank is the same as or higher than the reference liquid level position. Only when it is confirmed that the Characterized in that it has to emit the closing command to the first remote control valve provided in the liquid inlet pipe into the first tank,

Further, in the case of supplying a liquid from a tank to equipment such as an oil refining apparatus, when switching the supply source of the liquid being supplied from the first tank to the second tank,
An opening command is issued to a second remote control valve provided in a liquid supply pipe to the second tank, and at the same time, the liquid level position of the second tank when the opening command is issued Estimated based on the liquid level position of the second tank just before that is already input and stored from the liquid level gauge provided in the second tank,
Further, a position obtained by subtracting an arbitrary value from the estimated liquid surface position of the second tank is set as a reference liquid surface position, and after a predetermined time, the liquid surface input from the liquid level gauge provided in the second tank is Only when it is confirmed that the liquid level is the same as or lower than the reference liquid surface position, the first remote control valve provided in the liquid introduction pipe to the first tank is instructed to close the first remote control valve. It is characterized in that it is made to emit.

According to this method, the complete switching to the second tank is performed by opening the remote control valve provided in the liquid introduction pipe or the supply pipe to the second tank, and the liquid is introduced into the liquid introduction pipe or the supply pipe. It can be limited to the case where it is confirmed that the liquid level of the second tank actually flows in or out of the second tank through the pipe and rises or falls. Therefore, accidentally add liquid to the first tank to the second
It is no longer possible to prevent the operation of the apparatus from being stopped because it cannot be sent to the above tank or cannot be supplied from both the first tank and the second tank.

[0012]

1 is a system diagram showing an embodiment of a tank switching control device according to the present invention. The tank switching control device is
A liquid level memory-comparison device 24 to which a liquid level position signal is input via signal lines 20 and 22 from liquid level gauges 16 and 18 with output devices respectively installed in the tank 12 and the tank 14,
A valve control device 34 for transmitting an opening / closing control signal to the remote control valves 32, 30 via the signal lines 26, 28 to remotely control the opening / closing is provided. In the present embodiment, the petroleum refining apparatus 40 continuously delivers the product oil to the tank 12 or 14 through the delivery pipe 44 and the product oil introduction pipe 46 or the product oil introduction pipe 48 by the pump 42, respectively. The petroleum refining device 40 is a device that needs to be operated continuously, and is a type of device that must stop the operation of the device when the delivery of product oil is interrupted.

The above-described remote control valves 30 and 32 are installed in the product oil introduction pipes 46 and 48, respectively, and the opening and closing of the remote control valves 30 and 32 can start or stop the delivery of the product oil to the tank. The liquid level gauges 16 and 18 constantly measure the liquid level position of the product oil contained in the tanks 12 and 14 in a short cycle, and the measured values are stored in the liquid level storage / comparison device 24.
Is output to.

The liquid level memory-comparator 24 includes a liquid level gauge 16,
The liquid level measurement value input from 18 is stored in the memory together with the input time, and the liquid levels of the tanks 12 and 14 at any time are stored in the memory based on the latest liquid level measurement value in advance. It can be estimated according to the set relationship. Here, the preset relationship is, for example, a relational expression in which two points of the latest liquid level measurement values are connected and extrapolated. Further, the liquid level storage / comparison device 24 compares the liquid level in the tanks 12 and 14 with the reference liquid level position at an arbitrary time, and if the liquid level is the same as or higher than the reference liquid level position. , Remote control valve 3
The valve control device 3 receives a 0, 32 closing command via the signal line 52.
Output to 4. In addition, the liquid level storage / comparison device 24 appropriately stores the stored liquid level measurement value on an output device, for example, a display or a printer, for each input time, and further stores the stored liquid level measurement value and the input time. Based on this, the rising speed of the liquid surface can be output in a table format or a graph format.

The valve control device 34 controls opening / closing of the remote control valves 30 and 32 by manual input, and the remote control valve 3 is controlled.
A signal indicating that an open command has been output to 0 and 32 is output to the liquid level storage / comparison device 24 via the signal line 50, and a closing command output from the liquid level storage / comparison device 24 is output to the signal line 5.
It receives via 2 and issues a close command to the remote control valves 30 and 32 to close them.

With the above construction, when the destination of the product oil is switched from the tank 12 to the tank 14, it can be remotely confirmed that the product oil delivery path to the tank 14 is established as follows. it can. Now, it is assumed that the product oil is being sent from the petroleum refining device 40 to the tank 12 by the pump 42, and the liquid level of the tank 12 is gradually approaching the liquid level upper limit set for the tank 12.
The remote control valve 30 is currently open. Level gauge 16,18
Measures the liquid level of each of the tanks 12 and 14 in the set cycle and sends the measured value to the liquid level storage-comparison device 24. Before the liquid level in the tank 12 reaches the upper limit, it is necessary to switch the destination of the product oil from the tank 12 to the tank 14. When the operator recognizes on the display of the liquid level storage / comparison device 24 that the liquid level of the tank 12 is approaching the upper limit, at this point the valve control device 3
4 is manually input to issue an open command to the remote control valve 32.

The valve control device 34 transmits an open command to the remote control valve 32 and at the same time outputs a signal indicating that the remote control valve 32 has been issued an open command to the liquid level memory-comparison device 24. The liquid level memory-comparison device 24 receives the signal, when the liquid level measurement value of the tank 14 is just received from the liquid level gauge 18, or the liquid level measurement value, or when the same signal is received. When the liquid level measurement value of the tank 14 is not received from the liquid level gauge 18, the liquid level position at that time is estimated based on the liquid level measurement value stored in the memory as described above,
Further, an arbitrary + α is added to the estimated value to make it the reference liquid surface position.

Next, if the liquid level memory-comparator 24 receives the liquid level measurement value of the tank 14 from the liquid level gauge 18 at the time when the preset time has elapsed (current time), the liquid level is stored. When the measured value or the liquid level measured value of the tank 14 is not received from the liquid level gauge 18 at the time when a preset time has elapsed, the liquid level measured value stored in the memory as described above. Based on the above, the liquid level position at this point is estimated and used as the current liquid level position. Subsequently, the liquid surface memory-comparator 24 compares the current liquid surface position with the reference liquid surface position,
YES if the current liquid level has risen to the same level as the reference liquid level or if it is higher
A signal, otherwise a NO signal, is output to the valve controller via signal line 52.

The YES signal means that the liquid level in the tank 14 is actually rising, that is, the remote control valve 32 is open, and the NO signal indicates that the remote control valve 32 remains closed in the tank 14. Since the product oil is not delivered, the liquid level is not rising, or the remote control valve 32 is not completely opened,
Therefore, it means that the delivery of the product oil to the tank 14 is hindered, and it is not possible to switch to the tank 14 in any case. The valve control device 34 outputs a close signal to the remote control valve 30 in the case of a YES signal, outputs an alarm in the case of a NO signal, and suspends transmission of the close signal to the remote control valve 30.

In this embodiment, by issuing an opening command to the remote control valve 32 and comparing the rise in the liquid level of the tank 14 with a preset value after a predetermined time has elapsed, the product oil actually flows into the tank 14. In other words, it is confirmed that the remote control valve 32 is open, but it is also possible to obtain and confirm the liquid level rising speed of the tank 14 after the set time has elapsed. is there.

Next, a first embodiment of the tank switching control method will be described with reference to FIG. When switching the destination of the product oil being delivered from the tank 12 to the tank 14, first, an opening command is issued to the remote control valve 32 provided in the product oil introduction pipe 48 to the tank 14. At the same time, the liquid level position of the tank 14 when the open command is issued is estimated based on the liquid level position of the tank 14 immediately before input and stored from the liquid level gauge 18, and the estimated tank 14 is further estimated.
The position obtained by adding an arbitrary + α to the liquid surface position of is the reference liquid surface position. Next, when a preset time has passed (current time), the liquid level measurement value input from the liquid level gauge 18 provided in the tank 14 is compared with the reference liquid level position. Provided in the product oil introduction pipe 46 to the tank 12 only when it is confirmed that the liquid level measurement value input from the liquid level gauge 18 has risen to the same as or higher than the reference liquid level position. A close command is issued to the remote control valve 30. With the above configuration, when the tank 12 is completely switched to the tank 14, the remote control valve 32 provided in the product oil introduction pipe 48 to the tank 14 is opened, and the product oil passes through the product oil introduction pipe 48. It can be limited to the case where it is confirmed that the liquid level of the tank 14 actually rises by flowing into the tank 14.

Next, a second embodiment of the tank switching control method will be described with reference to FIG. When switching the supply source of the raw material oil being supplied from the tank 12 to the tank 14, first, an opening command is issued to the remote control valve 32 provided in the raw material supply pipe 48A from the tank 14. at the same time,
Tank 1 when an open command is issued based on the liquid level position of tank 14 immediately before, which is input from liquid level gauge 18 and stored
The liquid level position of No. 4 is estimated, and a position obtained by adding an arbitrary -α to the estimated liquid level position of the tank 14 is set as a reference liquid level position. Next, when a preset time has passed (current time), the liquid level measurement value input from the liquid level gauge 18 provided in the tank 14 is compared with the reference liquid level position. Level gauge 18
Only when it is confirmed that the liquid level measurement value input from the tank is the same as or lower than the reference liquid surface position, the remote control valve 30 provided in the raw material supply pipe 46A from the tank 12 is provided. It issues the close command. With the above configuration, in order to completely switch from the tank 12 to the tank 14, the remote control valve 32 provided in the raw material supply pipe 48A from the tank 14 is opened, and the raw material oil is transferred to the tank via the raw material supply pipe 48A. It can be limited to the case where it is confirmed that the liquid surface of the tank 14 has flowed out and the liquid level of the tank 14 is actually lowered.

[0023]

The tank switching control device according to the present invention stores the liquid level position inputted from the liquid level gauge provided in the tank and the input time thereof, and the liquid level position at an arbitrary input time. A liquid level memory-comparing device that compares the preset reference liquid level position with a remote control valve that controls opening and closing, and outputs a signal to the liquid level memory-comparing device to the effect that a command to close the remote control valve has been issued. ,
Further, by providing a liquid level storage-valve control device that receives the above comparison result from the comparison device, when switching the destination or supply source of the liquid from one tank to another tank, the liquid is sent to another tank. It can be confirmed remotely that the remote control valve provided in the route or supply route is surely open. In the tank switching control method according to the present invention, the work procedure of the tank switching control device according to the present invention is clarified, whereby the operator's burden can be reduced and tank switching can be performed reliably.

[Brief description of drawings]

FIG. 1 is a system diagram showing a first embodiment of a tank switching control device and method according to the present invention.

FIG. 2 is a system diagram showing a second embodiment of the tank switching control device and method according to the present invention.

[Explanation of symbols]

 12, 14 Tanks 16, 18 Liquid level gauge 24 Liquid level memory-comparison device 30, 32 Remote control valve 34 Valve control device 40 Petroleum refining device 42 Pump

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Wataru Tsukada, 3-7-36, Aoba-cho, Mizushima, Kurashiki-shi, Okayama (72) Seiji Koyama 2-5-1, Marunouchi, Chiyoda-ku, Tokyo Sanryo Heavy Industries Co., Ltd. Within

Claims (3)

[Claims] 1. A liquid level position of a stored liquid input from a liquid level gauge provided in each of a plurality of tanks and its input time are stored, and the liquid level position of the stored liquid at an arbitrary time point is stored in the memory. A liquid level storage-comparison device for estimating based on the liquid level position and further comparing the liquid level position at the arbitrary time point with a preset reference liquid level position, and a remote unit provided in a pipeline communicating with each tank. A valve control that controls opening / closing of an operation valve, outputs a signal indicating that a remote operation valve opening command is issued to the liquid level memory-comparison device, and receives the comparison result from the liquid level memory-comparison device. And a tank switching control device. 2. When switching the delivery destination of the liquid being delivered from the first tank to the second tank, an opening command is issued to a second remote control valve provided in a liquid introducing pipe to the second tank. And at the same time, the second command when the opening command is issued.
The liquid level position of the second tank has been input from the liquid level gauge provided in the second tank and is stored immediately before the second level.
Is estimated based on the liquid surface position of the tank, and a position obtained by adding an arbitrary value to the estimated liquid surface position of the second tank is set as a reference liquid surface position, and then provided in the second tank after a predetermined time. Provided in the liquid introduction pipe to the first tank only when it is confirmed that the liquid level input from the liquid level gauge has risen to the same level as or higher than the reference liquid level position. A tank switching control method characterized in that a closing command is issued to the first remote control valve. 3. When switching the supply source of the liquid being supplied from the first tank to the second tank, a start instruction is given to a second remote control valve provided in a liquid supply pipe from the second tank. And at the same time, the liquid level position of the second tank at the time when the start command is issued is set to the second level just before being stored and stored from the liquid level gauge provided in the second tank. Is estimated based on the liquid surface position of the second tank, and a position obtained by subtracting an arbitrary value from the estimated liquid surface position of the second tank is set as a reference liquid surface position. Only when it is confirmed that the liquid level input from the liquid level gauge provided at the same level as or lower than the reference liquid level position is confirmed, the liquid supply pipe to the first tank A special feature is that the first remote control valve provided is to issue the closing instruction. Tank switching control method to be considered.