Viscosity Control Electric Fuel Supply Unit Control System (original)

Viscosity Control Electric Fuel Supply Unit Control System

How the system works:
Viscosity Control Electric Fuel Supply Unit Control System uses heavy oil circulation pump to transport heavy oil to mixed oil tank mixed with light oil (back-to-oil), after the light oil circulation pump is delivered to the U-tube heater for heating treatment, the oil viscosity is reduced and filtered by the dual-cylinder filter before being delivered to the host. The viscosity sensor monitors the oil viscosity after processing in real time and sends the viscosity signal to the viscosity regulator. The viscosity regulator compares the current viscosity value with the set value, if there is a deviation, the steam flow of the U-tube heater is adjusted in real time according to a certain viscosity control policy, thus changing the temperature of the U-tube heater, after a series of adjustment processes, the oil viscosity is eventually stabilized within the range set by the system. The viscosity is controlled as an independent unit, and the control of the circulating pump is implemented by a relay control box.
According to the requirements of the manufacturer, we add a touch-type human-machine interface to the control unit to display the control conditions in real time. At the same time, to further simplify the control system and improve the reliability, PLC with better performance is used to replace the existing control box and viscosity regulator. The system structure is further optimized without increasing the cost, and the cost-effectiveness is greatly improved.
The transformation scheme is formed based on various situations, which is briefly described as follows:
Solution 1:
The system schematic is as follows.
 

In the solution, PLC monitors the working conditions of circulating pump, valve and other equipment, and controls the pump valve according to system settings to realize automatic control of circulation pump operation control and heavy oil and light oil supply switch valve; at the same time, according to the viscosity signal sent by the viscosity sensor, after comparison with the system set value, the steam valve opening PID adjustment, until the viscosity is controlled within the specified range. The Touch-type human-machine interface communicates with the PLC in real time through RS485 BUS, providing operators with intuitive real-time system condition display, alarm and control. The touch interface can be installed locally or remotely in the control room.
This solution Uses PLC to replace the original control box and viscosity controller, which simplifies the peripheral equipment of the system to the maximum extent and improves the reliability of the system. The cost of the industry-leading man-machine interface has not increased (the cost of the existing control box + viscosity controller is 6000 RMB), so the cost-effectiveness has been significantly improved. Taking into account the working environment conditions of the device, PLC, touch-type human-machine interface and other key equipment are selected famous brands of foreign industrial control enterprises.
At the same time, this solution uses the world's common intelligent interfaces, which not only can meet the requirements of various countries, but also can be connected to other systems of ships for convenient function expansion.
The scheme budget is as follows:

No. name, specification, model, quantity, amount
1 touch interface simatic tp 070 5.7 inch touch screen, blue LCD display, STN, backlight. 1 Set 2830
2 PLC Siemens S7-224XP 1 Set 2827
3 control box and auxiliary parts 1 Set 500
4 auxiliary power dc24 1 Set 150
5 PLC control software self-made 1 Set 7000
6 Self-made touch human-machine interface configuration software 1 Set 3000
7 Communication Cable PC/PPI interface cable (available as programming cable) 5 M 1 Set 200
8 labor costs
9. Profit
10 taxes
11 Total
Note:
PLC control software and touch-type man-machine interface configuration software are one-time.
SIMATIC S7-200 series PLC is suitable for all walks of life, various occasions in the detection, monitoring and control automation. The power of the S7-200 series enables complex control functions, whether in standalone operation or in a networked environment. Therefore, the S7-200 series has extremely high performance/price ratio.
---- S7-200 series outstanding performance in the following aspects:
-------- * Extremely high reliability
-------- * Extremely rich Instruction Sets
-------- * Easy to master
-------- * Convenient operations
-------- * Rich built-in Integration Functions
-------- * Real-time features
-------- * Strong communication capabilities
-------- * Rich extension modules
---- S7-200 series in the distributed automation system to give full play to its powerful functions. The range of application covers from simple control of alternative relays to more complex automatic control. It is widely used in all industrial and civil fields related to automatic detection and automatic control, including machine tools, machinery, electric power facilities, civil facilities, and environmental protection equipment. Such as stamping machine tools, grinding machines, printing machines, rubber and chemical machinery, central air conditioners, elevator control, and motion systems.
Simatic tp 070
Tp070 designed for SIMATICS7-200, with excellent cost effectiveness.
"5.7 inch LCD, blue STN, CCFL backlight, 320*240 pixels
"Use step-7 micro/win v3.1 (Pro) and TP designer Configuration
"Sturdy plastic housing
"Protection Level: Front Panel IP65, rear panel ip20
"Uses a 66 MHz, 32-bit Proteus Processor
"Front Panel size: 212*156mm (width * Height)
"Opening size: 198*142*45mm (width * height * depth)