JPH058620U - Blend direct shipment control device - Google Patents

Abstract

(57) [Summary] [Purpose] To increase or decrease the current setting value SV given to the control means by an instruction from the coefficient selection means at a fixed ratio so as to flexibly meet various user requests. [Structure] Set value sum calculation means for calculating the sum of the shipping flow rate set values given to each shipping port controller, and the set value obtained from this set value sum calculation means is corrected by a predetermined coefficient and corrected. The mixing master controller is provided with setting value correction means to be given as a setting value and coefficient selecting means for selecting a coefficient for correcting the setting value according to a predetermined condition determined in advance.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a blending direct shipment control device that mixes and ships different types of oil, for example, in off-site and sea shipping. More specifically, the blending ratio of the mixed fluid sent out from the shipping port can be set by the user in detail. The present invention relates to a blending direct shipping control device capable of being accurately controlled according to requirements.

[0002]

[Prior Art]

 FIG. 4 is a conceptual diagram of the configuration of the blend direct shipment control device. In the figure, 1a, 1b, 1c are semi-finished product tanks, 2a, 2b, 2c are pumps for sending semi-finished products (components) from the respective tanks, 3a, 3b, 3c are flow rates of the semi-finished products sent out. Displacement type flowmeters (component flowmeters) 4a, 4b, 4c are flow rate controllers (component controllers) that operate the control valves 5a, 5b, 5c to flow the semi-finished products from each tank (flow rate). ) Control. Reference numeral 60 denotes a pipeline through which the semi-finished products sent from the semi-finished product tanks 1a, 1b, 1c are mixed and sent out, and this pipeline is connected to the shipping port 7. 30 is a flow meter provided in a pipe line 61 connected to the shipping port 7, 40 is a shipping port controller that controls the flow rate of the mixed product shipped from the shipping port 7 by a control valve 50, and 8 is a mixing master control. It is a total.

The mixing master controller 8 adds signals from respective positive displacement type flow meters and calculates the total delivery amount by integrating the signals, and also sets the shipment amount of the shipped product and the mixing (mixing) ratio. The flow rate setting value of each flow rate controller is given so that it becomes a fixed ratio, and the start and stop controls at the time of shipment and the control when the control valve 50 installed at the tip is narrowed down. To do.

FIG. 5 is a time chart showing an example of shipping port control performed by the mixing master controller 8. When there is an operation start command from the operator, first, the control valve 50 is opened by a certain width (). Next, the own set value SV (current flow rate set value) is changed at a designated gradient so as to match the target flow rate set value, and PI control is performed on the set value SV (: The operation is called SET UP).

At this time, if the initial flow velocity control is designated, first, SET UP is performed on the initial flow velocity set value, and then SET UP is performed on the final flow velocity set value. If not specified, SET UP is performed for the final flow velocity set value.

The cancellation () of the initial flow velocity control is performed when the integrated amount reaches the initial flow velocity control cancellation amount or when there is an instruction from the operator. After the completion of SET UP, shift to normal PI flow rate control. In this PI flow rate control, the total of the set values SV from the flow rate controller 40 installed at the shipping port is used as its own set value, and it is multiplied by the ratio instructed by the host computer, and the flow rate controllers 4a and 4b of each component are , 4c ... are set to the set value SV, and the mixing control is performed. Then, when the accumulated amount of fluid from the shipping port reaches (set batch amount-prebatch amount), the set value SV of itself is decreased at the specified gradient until it matches the prebatch flow rate set value (: When the pre-batch flow velocity set value is matched, the set value SV is held at the pre-batch flow velocity set value (: pre-batch process). Finally, when the integrated amount matches the set batch amount, the control valve 50 is tightly shut and the batch ends ().

If an emergency stop command is issued while the batch is in progress, or if a deviation abnormality is detected, the control valve 50 is closed and the batch is temporarily stopped (: That).

[0008]

[Problems to be solved by the device]

 In such a blend direct-shipment control device, the mixing master controller 8 controls each of the component flow rate controllers 4a, 4b, 4c ... so that the flow rate delivered from the shipping port becomes a predetermined ratio of each oil type (component). Although the set value SV is distributed, in order to maintain the mixing ratio of each oil type accurately, the following functions are often requested by the user. (1) If an accumulation deviation occurs in each component, decrease the set value SV distributed to each component controller. (2) If the blender header pressure exceeds a certain level, decrease the set value SV distributed to each component controller. (3) The above (1) and (2) are combined and implemented. (4) When decreasing the set value SV, it decreases by a constant value at a time. (5) When decreasing the set value SV, gradually decrease it until the condition is released. (6) When the condition is canceled, the set value SV is returned to the original value. (7) When the condition is canceled, the set value SV is not returned to the original value. (8) When the condition is canceled, the set value SV is gradually returned to the original value.

An object of the present invention is to provide a blending direct shipping control device capable of responding to requests from these users in detail.

[0010]

[Means for Solving the Problems]

 The present invention, which solves such a problem, provides a mixing master controller for controlling the flow rate of each semi-finished product sent from a plurality of semi-finished product tanks to a predetermined mixing ratio, and a mixed fluid sent from a shipping port. A blending direct shipment control device having a shipping port controller for controlling the integrated amount to reach a set batch amount, and a setting for calculating the sum of the shipping flow rate setting values given to each of the shipping port controllers. A value sum calculation means, a set value correction means for correcting the set value obtained from the set value sum calculation means by a predetermined coefficient and giving it as the set value of the above-mentioned mixed master controller, and correcting the set value. And a coefficient selecting means for selecting a coefficient for the use according to a predetermined condition determined in advance.

[0011]

A selection signal is given to the coefficient selection means by a sequencer operating in a simple language such as a decision table, and the correction value in the set value correction means is selected based on this selection signal. As a result, the current set value SV is increased or decreased at a constant rate, and various master paging can be supported.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration block diagram showing an embodiment of the present invention. In the figure, the same parts as those in FIG. 4 are designated by the same reference numerals. In the mixed master controller 8, reference numeral 81 indicates the set value given to each shipping port controller 40 (that is, corresponding to the set value for each shipping port flow meter 30). 1SV, No. 2SV ... is input, and these are added to calculate a sum of the set values, and 82 is a setting for correcting the set value by multiplying the set value SVW obtained from the set value sum calculating means 81 by a predetermined coefficient. The value correction means comprises a coefficient multiplication means 83 and a switch SW for selecting one of the coefficients. Reference numeral 84 denotes a coefficient selecting means, which is supplied with a selection signal (not shown) by a sequencer which operates in a simple language such as a decision table and drives the switch SW 1. Reference numeral 85 is an SV data buffer in which the set value SV corrected based on the selected coefficient is held, 86 is a control means for inputting the corrected set value held in the SV data buffer 85, and 87 is a flow rate of each component. PV sum calculating means for adding the flow rate signals PV1, PV2, ... From the total 3a, 3b ..., 88 is PV data for adding these flow rate signals and giving the integrated value to the control means 86 as PV (process amount). It is a buffer. The control means 86 uses the target value of the flow rate control in each of the component flow meters 3a, 3b, ... According to the deviation between the set value held in the SV data buffer 85 and the process amount held in the PV data buffer 88. It has a function of distributing certain set values SV1, SV2 ... The operation of the apparatus thus configured will be described below.

FIG. 2 is a diagram showing the setting value correction processing in each state performed by the setting value correction means 82 according to the instruction of the coefficient selection means 84. When the switch SW is placed on the contact SO, the set value S V output and held in the SV data buffer 85 is a standard function, and the set value S V is SV = SVW (where SVW is the output of the set value sum calculation means 81). Value). The corrected set values SV output and held in the SV data buffer 85 when the switch SW is placed on the contacts S1, S2, S3 are as follows.

When S1, SV = SVW (1-α) When S2, SV = SVW (1 + β) When S3 SV = SV (hold) α; Down rate during paging, 0.0 to 1.0 Up ratio during β paging, 0.0 to 1.0 FIG. 3 is a logic diagram showing the operation of the set value correction means 82. In the device of the present invention, the coefficient selecting means 84 selects the switching position of the switch SW according to the condition specified in the sequence table, for example, and when the switching position is S1 or S2, the control means 86 is instructed. The given set value is corrected at an earlier timing than the set value of the shipping port controller 40 falls or rises, and it is possible to finely respond to the request from the user.

[0015]

[Effect of the device]

 As described in detail above, according to the present invention, in the blending direct shipping work in the off-site and sea shipping, the current set value SV given to the control means by the instruction from the coefficient selecting means is increased or decreased at a constant rate. Moreover, these instructions can be given in a simple language such as a decision table. Therefore, it is possible to provide a blending direct shipping control device that can flexibly meet various user requests.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a set value correction process in each state performed by a set value correction unit according to an instruction from a coefficient selection unit.

FIG. 3 is a diagram showing an operation of a set value correction means in a logic diagram.

FIG. 4 is a conceptual diagram of the configuration of a blend direct shipment control device.

5 is a time chart showing an example of shipping port control performed by the mixing master controller of the apparatus of FIG. 4. FIG.

[Explanation of symbols]

1a, 1b, 1c Semi-finished product tanks 2a, 2b, 2c Pumps 3a, 3b, 3c Volumetric flowmeters (component flowmeters) 4a, 4b, 4c Flow controllers (component controllers) 5a, 5b, 5c Control valves 40 shipping port controller 50 control valve 7 shipping port 8 mixing master controller 81 set value sum calculating means 82 set value correcting means 83 coefficient multiplying means 84 coefficient selecting means 85 SV data buffer 86 control means 87 PV sum calculating means 88 PV Data buffer

Claims (1)

[Claims for utility model registration] [Claim 1] A mixing master controller for controlling the flow rate of each semi-finished product sent from a plurality of semi-finished product tanks to a predetermined mixing ratio, and a mix sent out from a shipping port. A blending direct shipment control device having a shipping port controller for controlling an integrated amount of fluid to reach a set batch amount, and calculating a sum of shipping flow rate setting values given to each of the shipping port controllers. A set value sum calculating means, a set value correction means for correcting the set value obtained from the set value sum calculating means by a predetermined coefficient, and giving the set value as a set value of the mixed master controller, and correcting the set value. A blending direct shipping control device comprising: a coefficient selecting unit that selects a coefficient for performing the operation according to a predetermined condition.