Description of technological object
Objects of automation are storage tank battery (first
stage) and installation for gas treatment and propane-butane recovery
(second stage).
Managing the technological processes of storage tank
battery provides for remote monitoring and control of operating
modes of following technological objects:
- liquid propane tanks;
- gasoline tanks;
- propane pumps;
- gasoline pumps;
- systems of input, extract and emergency
ventilation;
- stop valves (geared);
- gas contamination monitoring system;
- fire alarm system;
- tank refluxing system;
- propane-butane compressor;
- liquid trap.
Managing the technological processes of gas treatment
provides for remote monitoring and control of operating modes of
following technological objects:
- separator, segregators, absorber;
- setting tanks and heat exchangers;
- pumps;
- air coolers;
- columns;
- furnaces;
- actuator valves unit;
- cutoff valves unit;
- ventilation system;
- geared valves;
- gas contamination monitoring system;
- fire alarm system;
- secondary (auxiliary) process objects.
Destination of the ACS
The system is intended for managing the technological
processes of Tymofiivka installation for advanced extraction of
raw hydrocarbons from natural gas, storing and shipment of end product
in accordance with operating standards of quality and provides automated
control and monitoring of process objects, primary (main) and secondary
(auxiliary) equipment.
Structure and functions of the ACS
Informating-controlling complex of the installation
for propane-butane and stable gasoline recovery includes two constituents
- the storage plant that contains controlling facilities for storing
and shipment processes, and gas treatment plant that includes controlling
facilities for managing the technological processes of propane and
stable gasoline extraction from natural gas.
Structure chart of the automated control systems is
shown on figure 1.
Figure 1 - Structure chart of the
ACS of Tymofiivka installation for liquid hydrocarbons extraction
The principle of distributed control with application
of programmable logical controllers (PLC) SIMATIC
S7-300 from SIEMENS is used in control system of technological
processes at Tymofiivka installation for advanced extraction of
liquid hydrocarbons. Control algorithms in the form of resident
software of PLCs provide direct control of basic technological operations
and monitoring of control actions over the process.
For process control in storage plant the technical
equipment of the system is placed in power switchboard room of pump-compressor
division and is mounted in control cabinet
number 2. Control
cabinets number 1-1 and number
1-2 are mounted in operator room of
gas treatment plant (GTP) and contain the equipment for monitoring
and control of processes of gas treatment and propane recovery.
Automation system of the GTP is implemented on two
controllers PLC1-1 and PLC1-2,
one of them performs the functions of safety system – SIL
(also it performs main functions). Critical parameters are operated
on basic controller PLC1-1 and on safety
system controller PLC1-2, to which
actuators (cutoff valves, relay contacts and so on) of safety system
are connected. Such structure provides for safety system that is
determined by requirements specification.
Monitoring and control software (SCADA) of operator
workstations number 1 and number
2 provides:
- data exchange with PLCs;
- graphic display of technological process
on monitor screen;
- operative imaging of specified information
formats because of irregularity signals;
- remote control by keyboard and mouse;
- data archiving and storage;
- visual and sound alarms and warnings,
technological signaling;
- data printing.
WinCC 6.0 SP2 from SIEMENS
is used as SCADA system.
Engineering workstation
is used for programming of the PLCs, configuring of SCADA-system,
modeling of technological process and for another tasks in the presence
of necessary software, also it can be used as standby operator workstation.
Touch sensitive operator panel
TP 270 6” from SIEMENS is intended for representation
of technological process flow and process control at storage plant
from power switchboard room (that is operator panel represents backup
control station with slightly restricted functions).
On the whole the automated control system provides
the performing of following functions:
information acquisition and centralized
control, operative representation of information about
technological process flow and state of equipment;
monitoring of state of pumps, ventilators,
compressors and other equipment and indication of corresponding
technological parameters;
remote control of electrical drives of
the aforesaid equipment;
automatic continuous monitoring of state
of health of basic facilities and devices;
program-logical control (blocking) for
automatic protection of equipment in accordance with technological
schedule;
notification of the personnel about abnormal
modes of working (technological signaling, alarm visual
and alarm sound signaling in the case of irregularity
of technological parameters);
execution of safety actions;
execution of procedures on data exchange
with upper level of management in real time or on request.
Examples
of the trends of basic process variables 320 KB >>
Examples
of symbolic circuits of technological process 200 KB >> |
