|
| |
 |
|
| |
| |
|
| |
| |
|
| Computer Based Automatic Control System For
L.R.F. |
Top |
|
| AIM |
Development of COMPUTER based online
Automatic Control System |
| |
|
| SCOPE OF
SSS |
| Supply of National Instruments make
hardware along with customised software. |
| Installation and Commissioning |
| |
| SCOPE OF
USER |
| Site preparation and cabling |
| Cables and cabling as and where necessary. |
| |
| Deliverables |
| National Instruments make Field point system
along with its controller and accessories. |
| 1. Personal Computer. |
| 2. |
Customised software to be installed in
Personal Computer, which will be custom
developed using LabView. |
|
| 3. Manual for operation of the system. |
| |
|
|
|
| |
|
|
| Technical Proposal - Introduction |
Top |
|
The electrode movement and its controls of LRF is to be precisely Controlled using a PC
based automatic control system. SSS is to develop Personal Computer based L.R.F
control system to interface the existing hardware, based on National Instruments
Hardware.
There will be 3 electrodes. These electrode movements are to be controlled independently
and collectively based on the current requirement, defined in the programme. Based on
the field requirement, the computer is to select the right amount of current and voltage
selection. The challenge is also to communicate with Spectrometer, Temperature
measurement system, Weighing machine etc. to get upto date data of the chemistry,
Temperature of the melt, weight of the liquid metal etc.
|
| |
|
| A. |
Weight of the liquid metal |
| B. |
Weight of slag |
| C. |
Chemical Composition of Liquid metal |
| D. |
Required chemical composition |
| E. |
Temperature of liquid metal |
| |
|
|
Based on the above parameter and in consultation with your experts/consultants, SSS will
develop a process control Software for controlling the electrode current and its
movements. When start command from the computer is given, then the PC will
automatically set the required Current parameters without any operator intervention, after
the required input parameters are provided Manually/Automatically. |
| |
| Reason for going to a PC based automation. |
| A. |
Old system is mechanically unreliable |
| B. |
Maintenance costs are high |
| C. |
More precise current control is possible with latest instrumentation |
| D. |
More precise level-1 and level-2 control |
| E. |
Faster heat time |
| F. |
Loss of process expertise from personnel changes is minimised due to PC automation |
| G. |
Lower operating cost due to improved technology |
|
|
|
|
|
| Design and operating details. |
|
| The Computer controlled LRF. Presently precise Electrode/Current control is not
obtained due various limitations. To over come this, a modified Computer system
is to be developed which will select the required Current and its electrode
movement with precise calculation, maintain database and then control the field
actuators. |
|
| |
| Alloy addition. |
| We shall be providing an alloy addition wizard so that the addition
can be accurately and economically determined. |
STANDARD
L.R.F.CONTROL |
SSS. L.R.F.CONTROL |
ADVANTAGE |
Single Control panel
with Multiple
instrumentation |
Single monitor with multiple screens |
More information,
Less Capital cost |
| Experience based
Chemistry / Temperature
Estimates. |
Computer modeled |
Time, Energy and
refractory saving |
| Manual Collection of
Data |
Automatic acquisition (e.g. Weight,
Chemistry, Temperature, Aims etc.)
Note: To effect this, the system
should have Automatic weighing,
Communication with Spectrometer,
Communication with Temperature
measuring instruments etc. |
Convenience and
accuracy |
| Manual adds calculation |
Adds wizard |
Least cost material,
accurate chemistry
control |
| Operator dependent
practice and processing |
Automated processing |
Automated processing |
| Manual record keeping |
Automated heat summary. |
Convenience, Quality
control |
| Remote viewing of live
data not possible |
Remote viewing and if required,
controlling is possible through
internet.
* Condition apply |
More convenient and
systematic control |
Networking with Lab,
Pyrometer, Weighing
scales MIS etc. not
possible |
Networking with Lab, Pyrometer,
Weighing scales MIS etc. is easily
attained after interfacing with such
instrumentation. |
Accurate and perfect
control |
|
|
|
| |
|
|
| A. |
Quality of current practice |
| B. |
Temperature control |
| C. |
Slag chemistry control |
| D. |
Shorter and faster heat times |
| E. |
Grade specific practices. |
| |
|
|
|
|
|
|
| Operators Console : |
| A. |
Control Hardware: National Instruments Field-Point along with SSS proprietary
hardware. |
| B. |
Computer: Reputed make with 2.8GHZ, Pentium IV, 256MB RAM, 40 GB Hard
disc, 42X CD ROM drive, Scroll mouse. |
| C. |
Monitor. 17” Colour(LCD), make :any standard |
| D. |
Operating system: Microsoft Windows-XP |
| E. |
Control Software: Developed through National Instruments LabVIEW 7.1 or later |
| F. |
Communication between Hardware and PC: through Ethernet port |
|
|
| Hardware for the system |
Top |
|
| A typical BLOCK DIGRAM of the proposed system is illustrated below. |
| |
|
| |
 |
|
| |
| |
| |
 |
| |
AOD (Argon Oxygen Decarburization) is popularly used in the stainless steel making process. AOD has top lance for oxygen injection and several bottom tuyeres to blow oxygen or inert gas. The inert gas will be argon or nitrogen.
SSS developed a very innovative method of controlling the flow of these gases as well as chemistry of melt.
This PC based system models carbon content and temperature of the melt during decarburization, and controls the reduction temperature and chemistry more accurately.
The system performs all tasks and do all calculations, vessel positioning, ratio setting of inert gas etc.
SSS PC BASED AOD control system and its procedures ensure unmatched consistency during entire operation. It also allows manual override of the system whenever required.
All metallurgical calculations are done automatically during its operation and necessary suggestions for additions are given whenever required.
With this system,Minimum heat-to-heat time can achieved.
-
Minimum operating cost with improved and consistent quality.
-
Direct interfacing with spectrometer, Temperature measurement system, weighing scale etc. is possible. Thus eliminating tedious record keeping and human error.
-
Level II and level III controls are possible.
|
SSS- ARC Furnace Control System
PC based arc furnace regulation and control system with a superimposed powerful HMI station, provides an easy to upgrade and yet sophisticated approach to EAF optimization. The overall system is based on the integration of various functional components, which can be applied individually to a partial upgrade situation or supplied as a complete system for a new operating environment.
System components:
- Electrode regulation
- Furnace motion controls
- Harmonic analysis
- Demand Control
- Process and production monitoring
- Engineering, production and performance reports
Expected benefits:
- Lower energy consumption (KWHR/TON)
- Faster melting cycle
- Reduced electrode consumption (including less breakage)
- Reduced refractory consumption
- Enhanced operator's understanding of process performance parameters through performance indicators
SSS know the Bits and Bytes of Power Plant Control Systems, about your Business ?
SSS can be contacted for automation of the power generation industry. SSS do automation & optimization solutions using National Instruments Hardware and Software. No matter what kind of power plant you are planning to build or currently operate we understand your processes and have the right solutions for your plant. Regardless, of the location of your plant , we shall be there to support you with long term service contracts, experienced service personnel and specific service solutions.
Another innovation from SSS is a PC based cooling system for cooling a continuously cast strand, e.g., a continuously cast steel slab/billets. In the continuous casting of slabs, particularly steel slabs, the slab is spray cooled in a secondary cooling zone after leaving the mold. To prevent crack formation on the slab surface, specific requirements are imposed on the spray cooling as regards uniformity, control of the spray intensity, adjustment to different slab widths, etc. Aside from these technical requirements, certain economic conditions such as low initial and maintenance costs, as well as low breakdown rates, must be satisfied.
SSS cooling system for secondary cooling zone which attempts to satisfy these complex requirements. In particular, controlled cooling is employed to avoid the formation of cracks on the slab surface. This cooling system is also intended to provide optimal results regardless of the shape and dimensions of the slab.
Content 7
Content 8
|
| |
|
| |
|
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
|
