# Attachment 1

Seminole Dry Conveyor Bottom Ash Handling System Summary Descr iption and Diagram

# THE BOTTOM ASH SYSTEM DESIGN:

The primary ash removal conveyor is mounted beneat h the boiler, fully sealed to the combustion

chamber. The negative pressure inside the boiler draws in air in a controlled manner through the

primary conveyor. The incoming am bient air travels along the convey or, counter to the ash flow

direction, over the surface of the ash contained on t he conveyor pans. This causes a re-burning

process of the glowing ash, which reduces the unburned carbon level and frees up additional thermal

energy. Therefore, the air is pr eheated before it enters the combustion chamber of the boiler.

THE ARRANGEMENT

Underneath the combustion chamber of the boiler, a hopper is insta lled and supported from the floor

by means of a steel structure. The transition c hute or hopper is lined with special refractory and

insulation on the inside to withstand the radiation from the combustion chambe r of the boiler. A heat

resistant fabric compensator (expansion joint) is installed between the bo iler/hopper outlet and the

primary conveyor inlet, to compensate for the movement between the cold and hot conditions of the

boiler. Large slag agglomerations ar e broken down by jaw crushers in order to ensure they are an

appropriate size to be cooled and conveyed. These jaw crushers are hydraulic operated. In the full

closed position, they will provide isolation of the primary conv eyor from the boiler hopper.

THE REST OF THE SYSTEM

In addition to collecting the bottom ash in a dry condi tion, Seminole also collects its economizer ash

in a dry condition. The ash is collected from the bo iler economizer area in 6 h oppers that discharge to

a series of drag chain conveyors that transport the ash ont o the primary conveyor where it is added to

the bottom ash.

Once the bottom ash and economizer ash are removed from the boi ler by the primary conveyor, it is

transported up to the transfer tower where the ash then passes though a double roll grinder to reduce

the particle size to below 3 inches. The crushed ash will fall onto a secondary transfer conveyor that

is very similar in design to primary conveyor

. The ash will travel up the se condary conveyor where it

passes through another set of single roll crushers where it is reduced to 3⁄4 inches in size and is then

discharged into the storage silo. The ash is stored in a dry condition. Seminole has the capability of

offloading the ash in either a dry or a wet co ndition. The Pug mill wet unloading system adds

sufficient quantities of water to condition the as h to prevent dusting in open top trucks. The dry

unloading system utilizes a retract able loading spout that is attached directly to specialized trucks

designed to receive dry material.

# Seminole Dry Conveyor Bottom Ash Handling Syste m Summary Diagram Removed

- CBI

# Attachment 2

Seminole Plant Water Diagram200GPM , 90 Min/DayEVAP957GPMEVAP20GPMEVAP1032 GPM1020 GPM170GPMRAINFALL1632GPM55 GPM1750GPM1750GPM174GPMGYPSUM SLUDGEDemin RegenNH3 TO SCRPolisher Regen1177TPDWaterWaterUREACOMMON FGDSYSTEMSUPERNATE RETURNTANKSFGD EffluentBLOWDOWNAsh Pile Run OffLEACHATELandfill Run OffGypsum PileRun OffSOLDSOLID WASTEDISPOSALFLTBWTruck Wash WaterSEMINOLE GENERATING STATIONFGD RecircUREASLUDGE442GPM61GPM0.3 TPDPURGEWATERSLUDGE158TPD61GPM50GPM55GPMBOILER MAKEUP442GPM889GPM61GPM25GPM52GPM4359GPM1032GPM8000TONS, 1X/YR25GPMFIRE PROTECTION SYSTEMBASIN3GPM61 GPMSLUDGE191GPM3291GPMBOTTOM ASHSLUDGE195TPD113GPMWASTE SLUDGE191GPM548GPM25 Tons, 4x/yr14GPMPRETREATMENT BLOWDOWN/SLUDGEPOTABLE WATER SYSTEM133GPMQUENCH WATER85GPM85GPM110GPMPURGEWATERTREATMENT SYSTEMSURGE TANKWASTEWATERTREATMENT SYSTEMBottom Ash SystemCommon PlantServices(Unit 1 and Unit 2)PRETREATMENTSYSTEMDEMINERALIZERSYSTEMNEUTRALIZATIONRAWWATERWELLSINTAKEUREA TO AMMONIASYSTEMSANITARYTREATMENTD-001I-006I-002MFA/LANDFLANDFBOILERBLOWDOWNSOLDHAULFDW110GPMRAINFALL525,000 GPD, 4D/YR4GPMEVAP2GPMEVAP2GPMEVAPRAINFALLRAINFALL8050GPM6GPM133 GPM1117GPMSolids480 TONS,1X/YRRIVER11051GPM11341GPM3291GPMWATERINTAKECOAL PILE RUNOFFPONDSCOOLINGTOWERSPercolation PondsAir HeaterI-004A & BLANDFILL