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# JE/\ Northside Units 1and 2 Repowering Project Rev. B 

### Ash Recoveryand Handling System Operating Procedure 06/18/01



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### Figure 1 - SimplifiedAsh Recoveryand Handling System Flowpaths 1.3 Ash Recovery Handling SystemOverview This section provides an overview of the Ash Recovery and Handling System by detailingthe primary and secondaryflow paths and configuration. 

### 1.3.1 BedAsh Handling SystemOverview The bed ash system cools ash from the bottom partofthe fluidized bed and delivers it to the bed ash silo where it is stored until it is removed from the site. The detailed flow path ofthe system is shown on flow diagramsARH-FD-1, and ARH-FD-2. These diagrams showthe arrangement ofthesystem's majorcomponents, flow paths, and control elements that include: 

## 0 StripperCoolers tothe Bed Ash Surge Hoppers 

## 0 Bed Ash Surge Hopperstothe Bed Ash Silo Rev. 8- 06/18/01 SOP-ARH-rB.doc Page 3

# JE/\ Northside Units 1 and 2 Repowering Project Rev. A

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**~** AIR HEATER i -----1 . ; ···..............._.·· ....····•·

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### AirQualityControl System System Operating Procedure

TO RECYCLE STORAGE BIN



### Figure 1- AQCS Overview 6-21-01


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The detailed flow path ofthe Air Quality Control System is shown on flow diagrams AQC-FD-001, AQC-FD-002, and AQC-FD-003 provided at the end of the procedure. These diagrams show the arrangement ofthe system's major flow paths and components that include: 

## 0 Selective Non-Catalytic Reduction System 

## 0 Spray DryerAbsorber 

## 0 Lime Slurry Preparation System 

## 0 Fabric Filter (Baghouse) 

## 0 Constant Emissions Monitoring System

Rev. A- 21 June,-01 SOP-AQC-rA Page 3

# JEl\ Northside Units 1 and 2 Repowering Project

PERFORATED DISTRIBUTION PLATE Air Quality Control System System Operating Procedure

Figure 3 - SDAOperation I

**~** • - I r .... Rev. A 6-21-01

The flue gas enters the top of the Spray Dryer Absorber through a flue gas distribution system. This distribution system uses a perforated plate that creates a plug flow flue gas pattern. The lime slurry is introduced into the SDA through fluid nozzles that atomize the slurry into fine spray droplets. The nozzles are installed in a piping manifold and spaced across the top ofthe SDA in a pattern that causes the slurry sprayto coverthe entire area ofthe SDA. S02 is removed from the flue gas stream in two separate chemical reactions. First, the acid gases react with the calcium hydroxide in the slurry creating calcium sulfite as shown here:
Rev. A- 21 June, 01 SOP-AQC-rA Page 8

# JEl\ Northside Units 1 and 2 Repowering Project 

### Rev. A Air Quality Control System System Operating Procedure 

### 6-21-01 The lime slurry system is shown in Figure 4 and in flow diagram AQC-FD-001, atthe end ofthis module. ASHAND SOUDS FROM FABRIC FILTER HOPPER EXCESS ASH/ .----+SOLIDSTO FLY

RECYCLE STORAGE BIN
ROTARY FEEDERSAlB

RECYCLE SLURRYMIX TANK

REUSE -------., WATER - I RECYCLE SLURRY STORAGE ASHSJLO

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TANK L__:::::_,j----"1-ti*'" FEEDSLURRY TRANSFER PUMPS AlB FEED SLURRY PUMPS

AlB FEED SLURRY HEAD TANK
TOSOA SPRAY MANIFOLD

LIME SLURRY

STORAGE

TANK LIME SLURRY FEEDPUMPS AlB LIMESLURRY TRANSFER

PUMPS A1&A2 81 &82 Figure 4- Slurry Preparation System 

### Recycle Slurry LIME STORAGE

SILO TRUCK FILL

LIME FEEDERS (AlB) (ROTARYAND WEIGHT) MILL PREMIX CHAMBER (AlB)



### Recycle slurry is un-reacted or unused lime that is recovered from the fabric filter and SDA hoppers and mixed with water to create a 40-45% solids slurry. Reusing the partially spent lime lowers the amount offresh lime required by the sulfur removal process, thereby making the process more economical. The lime comes in twoforms, eithercalcium oxide (CaO) collected from the combustion process in the fabric filter hoppers, or calcium Rev. A- 21 June, 01 Page 10 SOP-AQC-rAr 

# JE/\

TOFEED SLURRY TRANSFE----;

PUMPS

FROM FEED i )' tSLURRY

TRANSFER

PUMPS FROM REUSE WATER HEADER (FLUSH) FROM REUSE WATER HEADER (FLUSH) FROM REUSE WATER HEADER (FLUSH) VENT 

# : Northside Units 1and2 Repowering Project AirQualityControl System System Operating Procedure

FEEDSLURRY

**P~1A** N01·RAOH07

FEEDSLURRY

PUMP1B N01-RA01-G08

Figure 15- SDAFeed SlurrySystem **~** PENTHOUSE

DRAIN 

### Rev. A 6-21-01

One Feed Slurry Pump is normally in service with the other serving as a backup. The pumps are installed in identical parallel piping arrangements. The Feed Slurry Pumps are rubber lined, single stage centrifugal pumps driven by 480 Volt, 40 HP motors. Each pump is equipped with pneumatically operated suction and discharge valves. Drain lines are provided in each pump's suction header and flush water supply lines to each pump discharge header. The drain and flush valves operate togetherto clearthe slurryfrom the pump and piping when a pump is shutdown. Flushing prevents the solids in the idle slurry pump from separating from the liquid and settling out in the bottom of the components. When a pump is shutdown the suction and discharge valves close automatically. The drain and flush water supply valves then open automatically to allow Reuse Waterto flowthrough the pump and piping and drain into the SDA penthouse drain. These valves all operate automatically when a pump is started. The following automatic sequence is initiated when a pump is started: 

### 0 Pump given start signal 

### 0 Pump drain and flush valves close 

## 0 Pump suction valve opens Rev.A - 21 June, 01 SOP-AQC-rA Page 33