coal_handling_plant.pdf

Coal Handling Plant (C.H.P) clear your idea about coal handling plant. What is CHP? CHP is (C- Coal, H- Handling, P- Plant) a plant which handles the coal from its receipt to transporting it to Boiler and store in Bunkers. It also processes the raw coal to make it suitable for Boiler O...

Coal Handling Plant (C.H.P) clear your idea about coal handling plant. What is CHP? CHP is (C- Coal, H- Handling, P- Plant) a plant which handles the coal from its receipt to transporting it to Boiler and store in Bunkers. It also processes the raw coal to make it suitable for Boiler Opeartion. Coal Handling Plant (CHP):- Extent of work: - In brief we can say that receipt of coal from coal mines, weighing of coal, crushing it to required size and transferring the quanta of coal to various coal mill bunkers. This is the responsibility and duty of the CHP and its staff. CHP (Coal Handling Plant) This dept. takes care of all coal handling processes. ▪ Coal collection ▪ Coal crushing ▪ consequent milling Coal Handling Plant, similar to a Coal preparation plant, though usually without a washery Coal handling Coal needs to be stored at various stages of the preparation process, and conveyed around the CPP facilities. Coal handling is part of the larger field of bulk material handling, and is a complex and vital part of the CPP. Stockpiles Main article: Stockpile Stockpiles provide surge capacity to various parts of the CPP. ROM coal is delivered with large variations in production rate of tonnes per hour (tph). A ROM stockpile is used to allow the washplant to be fed coal at lower, constant rate. A simple stockpile is formed by machinery dumping coal into a pile, either from dump trucks, pushed into heaps with bulldozers or from conveyor booms. More controlled stockpiles are formed using stackers to form piles along the length of a conveyor, and reclaimers to retrieve the coal when required for product loading, etc. Taller and wider stockpiles reduce the land area required to store a set tonnage of coal. Larger coal stockpiles have a reduced rate of heat lost, leading to a higher risk of spontaneous combustion. Stacking Main article: Stacker Travelling, lugging boom stackers that straddle a feed conveyor are commonly used to create coal stockpiles. Reclaiming Main article: Reclaimer Tunnel conveyors can be fed by a continuous slot hopper or bunker beneath the stockpile to reclaim material. Front-end loaders and bulldozers can be used to push the coal into feeders. Sometimes front-end loaders are the only means of reclaiming coal from the stockpile. This has a low up-front capital cost, but much higher operating costs, measured in dollars per tonne handled. High-capacity stockpiles are commonly reclaimed using bucket- wheel reclaimers. These can achieve very high rates Receipt of Coal:- Normally Thermal Power Station receives the coal by three modes of transportation. 1. By Railway (80-90% of the requirement is fulfilled by this way) 2. By Road ( if required 5-10% of the requirement is fulfilled by this way ) 3. By Arial ropeways ¨ Arial ropeway is available only to the power stations which are near the coal mines ¨ Cost of coal transportation by road is much higher than that for rail transport hence most of the coal requirement of the power stations is fulfilled by railway transport. Demurrage calculations on coal Rakes:- We receive the coal wagons in the form of rakes (55-60 wagons in each rake). ¨ These coal rakes are to be unloaded in given free time normally 12-14 hrs. from the time of receipt of coal rakes. ¨ Free time is calculated from the receipt of written intimation of coal rakes from the railway and written intimation of empty rake formation from MSEB to railway. ¨ Rate of demurrage is Rs.1/- per ton per hour. ¨ If coal rake is not unloaded in given free time the demurrage shall be charged on complete capacity (approx. 3300 metric ton) of coal rake at the rate of Rs. 1/- per ton per hour. CHP is used to abbreviate Combined Heating and Power as a business direction in designing Optimal utlization models of produced gas. The business models that focus on CHP derive maximum value of hydrocarbon gas in the overall value chain. In comparision with Bulk-Gas sales, the CHP provides 70-80% increase in value of the produced gas. This often leads to smaller carbon foot-print and better carbon credits to the Upstream oil&gas sector. “ 203.199.41.16 (talk) 12:29, 25 June 2008 (UTC)” Major auxiliaries of CHP:- 1. Wagon Tipplers 2. Vibrating Feeders 3. Conveyor Belts 4. Coal Crushers 5. Trippers 6. Electromagnetic Separators. 7. Dust extraction systems 8. Gas Extractor. Wagon Tipplers:- These are the giant machines having gear boxes and motor assembly and are used to unload the coal wagons into coal hoppers in very less time (e.g. 20 wagons/hr. or more). Vibrating Feeders:- These are electromagnetic vibrating feeders or sometimes in the form of dragging chains which are provided below the coal hoppers. Thisequipment is used for controlled removal of coal from coal hoppers. Conveyor Belts:- These are the synthetic rubber belts which move on metallic rollers called idlers and are used for shifting of coal from one place to other places. Coal Crushers:- We receive the coal in the form of odd shaped lumps. These lumps are to be crushed to required size. These lumps are crushed by coal crushers. Trippers:- These are the motorized or manually operated machines and are used for feeding the coal to different coal bunkers as per their requirement. Electromagnetic Separators:- Electromagnets are used for removing of Iron and magnetic impurities from the coal. Dust Extraction System:- This system is provided in CHP for suppression of coal dust in coal handling plant. Gas Extractors:- Gas extractors are provided at the bunker level to remove all types of poisonous and non poisonous gases from the working area. Operational Cycles:- 1. Normal Bunkering cycle. 2. Stacking cycle. 3. Reclaiming Cycle. Normal Bunkering Cycle:- Shifting of coal received from coal wagons directly to coal bunkers is normal bunkering cycle. Stacking Cycle:- When there is no coal requirement at coal bunkers even then CHP has to unload the received coal which is stacked at open ground called yard. This is stacking cycle. Reclaiming Cycle:- As and when coal wagons are not available the requirement of coal bunkers is fulfilled from the stacked coal this is reclaiming cycle. Weighing of Coal:- Weighing of coal is carried out at wagon tippler. Weight of loaded wagon is taken; after unloading the coal, weight of empty wagon is taken the difference of the two will give the weight of the coal (normally 55-60 metric ton of coal come in each wagon). Payment of Coal:- Payment of coal is made to the coalmines as per the weighing of coal carried out at their premises. However, if any dispute arises regarding weighing of coal same is to be settled by the committee of both the parties. Stone shells:- Sometimes stone shells are received along with coal same has to be removed from the coal before bunkering and is done sometimes manually or by different type of machines. If quantum of stone shells is beyond minimum limit the cost of the coal is recovered from the coal mines against the quantity of stone shells received from them. Chemical Analysis of Coal:- Sample of coal is randomly collected from each rake by concerned MSEB staff and detailed chemical analysis, calculation of calorific value is carried out and is confirmed whether it is as per agreement with the coal mines or not. Pics of some C.H.P : >>>> Thanking you