Product Description

Conveyors are seen on virtually all in the Coal Handling Plant (CHP). CHP are having number of conveyors. The control systems used for these conveyors are important for operating safe plant. Basically conveyors are dumb, but once equipped with proper control system they yield efficient and safe plant operation. Electronic intelligent conveyor control technology is useful for complex conveying tasks. But in CHP for control of conveyer system still use of simple on/off switches and some forms of speed switches are used. These switches are only play roll of protection up to some limit. These conveyors control system are the biggest problem for the plant operator and maintenance engineer, being the cause of unsafe plant operation, which forced to plant breakdowns and interrupt coal supply to boilers results in loss of generation. The efficiency of CHP is depending upon availability and reliability of conveyor system. If a conveyor system is working well, it is almost invisible to the CHP. A single conveyor can run at close to 100% reliability, but as the number of conveyor increases, the reliability of the conveyor system is mostly depend upon its control system. The control system should be capable to fulfill all the need of CHP operation. The existing systems are designed to take care of only conveyor stoppage due to conveyor zero speed and sequential operation. They also ensured of auto operation of dust spray system. The measurement of coal transported is done automatically by this system. But improper system feature could not fulfill CHP operation requirement. At maximum places the simple relay control system with old style mechanical sensing devices are used. Principle of Operation: Before starting conveyor system it is necessary to start first receiving conveyor and then start feeding conveyor i.e. operating logic is from down stream to upstream. For stopping of conveyor system the operation will be opposite i.e. from upstream to down stream. So it is necessary if any conveyor is stopped in the system all the upstream conveyor should stop automatically. The existing system takes care of this logic. This is known as conveyor sequential operation. For fulfilling the requirement, Electronic intelligent conveyor control system has developed. This system will take all the constraints of old system and also having additional feature like Programmable Timing & data storage facility & Remote Start and Stop facility are provided with necessary Sequential Switching Operation.