PCI Introduction Video | Blast Furnace | Tech It Eze
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- Опубликовано: 1 дек 2024
- PCI Process Flow Diagram
Coal flow stared from raw coal shed, from where coal feeding done through conveyor to raw coal silo. Magnetic separators used to separate unwanted ferrous materials. Coal flow discharge into coal feeder or drag chain conveyor is controlled through rod gate & slide gate. Then coal is fed into raw mill in a controlled way maintaining mill differential pressure. Mill grinding table rotation provided through grinding motor. In mill two things done. One is grinding and another is moisture separation. Normally -200 mesh size maintained from 80 to 90 and moisture maintained below 1 percent. Hot gas required to remove moisture from raw coal provided by hot gas generator. BFG & Combustion air used to produce hot gases. LPG used as pilot burner for initial periods of heating. Blast furnace stove waste gas also used for this purpose. Induced draft Fan used to create negative pressure or suction. With the help of suction pressure coal powder sucked through bag filter and separated. Classifier controls the outgoing coal fineness by controlling its rotation speed. If we increase rotation then more fine coal will only can pass through mill. Coal separated through bag filter with the help of bags and pulsing system. fine coal screened for separating any oversized coal if available. Fine coal accumulated into fine coal silo and discharged through Injection tank and distributor, finally injection into the furnace through the lances.
Major Risk or Incident in PCI
FIRE IN BAG FILTER or MILL or PCSB
We know the FIRE TRIANGLE, Fuel, Oxygen and Temperature. In PCI Fuel available is Coal and carbon monoxide gas, Oxygen could be available in stove waste gas line and leakage in duct, flange joints. Temperature available in HGG and Mill outlet.
Probable Reason of fire in bag filter is:
High temperature
High Oxygen concentration
High Carbon monoxide concentration
Insufficient or No supply of N2 purging or inert gas
Failure of Oxygen, Carbon monoxide analyzer, pressure or temperature transmitter
Failure of Safety interlock (Automation)
EXPLOSION IN HGG
Probable Reason of explosion in HGG:
Improper Air to Gas ratio due to malfunction in control valve in BFG, LPG and Combustion Air line.
BF gas entry in HGG due to leakage from gas shut off valve.
Blowpipe failure
Probable Reason of blow pipe failure:
Lance got burnt or short length due to lance choked.
Nitrogen failure in lance
Off center of PCI lance
Accumulation of coal in blow pipe.
Back fire in lance
Probable Reason:
Nitrogen failure in lance.
Lance got choked.
Scab dislodging in front of tuyere.
Major process safety devices used in pci to avoid fire and explosion:
Separate temperature transmitter used to indicate HGG outlet, Mill Outlet, Bag Filter Inlet - Outlet, pcb and injection tank temperature. In case of High temperature detected, Nitrogen purging will start, if temperature not controlled, then Mill will be tripped.
Oxygen and carbon monoxide analyzer used in Mill Inlet and Outlet, Bag Filter inlet and Outlet. In case Oxygen or Carbon monoxide reaches High range, immediately purging nitrogen will be started in auto interlock. If not controlled and further reaches to High High value then nitrogen purging will continue and mill will be tripped.
Flame sensor used to identify HGG flame is on or off. In case it do not detect flame within a specified time, BF gas and combustion air should be stopped.
Nice sir 👍
Thanks and welcome
Thank you sir🙏🙏
Most welcome
Very nice sir
Thank u ❤️ keep watching
Grt sir
Thanks and welcome
Sir make a video this topic how coal running PCSB to tuyere platform by through lance
1. Injection tank change over
2. Pressurized, depressurize, filling & conveying
3.distributor platform
Okay keep watching
Already Distributor to Lance videos there plz check
Rest topics will be shared soon