Three - Pass Fire Tube Boilers


Three - Pass Fire Tube Boilers
Arrangement of the remaining flue gas passes in the three pass boiler he fire tube forms the combustion chamber The chosen diameter makes sure that an unobjectionable flame can develop and a complete burn out is guaranteed The decision whether plane or corrugated fire tubes are to be used depends on the diameter and the working pressure 

Small steam - generators up to big double-flue boilers are capable for the combustion of:

1.Heavy Oil
2.Gas Oil
3.Gas
4.Waste material


All parts of boiler plant such as boiler, pumps, deaerator, chemical, dosing, water softening, fuel system etc. could be supplied by FAP.

Economizer Advantages
1.A lowering of the flue gas temperature by 100 ºC will improve the efficient rate by 5%-points.
2.No falling below the dew point.
3.No probes by condensation.
4.No special requirement on the material for flue gas ducts and chimney.
5.Sufficient thermal buoyancy for the flue
Super Heater
The increasing of the steam temperature to a value:

1.At temperatures up to 2500C the superheater can be installed in the front reversing chamber.
2.For temperature ranges up to 4000C the superheater is arranged directly behind the fire-tube in an exterior, water-cooled reversing chamber.


THREE PASS FIRE TUBE HOT WATER BOILER


MODEL No. OF BURNER BOILER OUTLET TEMP.
(ºc)
CAPACITY
(MW)
DESIGN PRESS.
(bar)
DWH 1 ONE 200 1.6 - 9.0 MAX.20
DWH 2 TWO 200 10.5 - 18.5 MAX.20






THREE PASS FIRE TUBE HOT BOILER

MODEL No. OF BURNER BOILER OUTLET TEMP.
(ºc)
SUPER HEATER TEMP.(ºc) CAPACITY
(T/hr)
DESIGN PRESS.
(bar)
DWH 1 ONE SATURATED MAX.400 2 - 14 MAX.20
DWH 2 TWO SATURATED MAX.400 16 - 30 MAX.20


Control System
Operation safety of boilers is secured by neessary automatic safety components linked into so-called "safety chain" if the any of elements actuates, i.e. it transmits impulse for fault, the fuel supply is interrupted, and the burner is switched-off or it is not switched-on at start, and a single "fault" is announced as well as optical or acoustic alarm or both.


SAMPLING COOLER

 

Function:
This equipment is a counterflow heat exchanger for cooling of boiler water , feet , steam , chemical solutions and other fluid samples at high temperatures.
The cooler is used on the liquid sampling panel.

The following equipment could be also supplied by FAP in order to complete the complete the sampling equipment:
1.CO2 Scrubber
2.Caution Exchanger Vessel (including resin)
3.Simplified Cubicle (enclosure of sampling rack)
4.Press Reducer & Safety Valve
5.Thermometer & Pressure Indicator
6.Flow Indicator & Flow Meter
7.Analyzaer & Transmitter
8.Simplified Cubicle (enclosure of sampling rack)
9.Heater and Controller (for cubicle)

PROCESS DATA for BOILER SAMPLING

DESCRIPTION UNIT DEFAULT REMARKS
Sampling fluid Steam / water Tube Side
Sampling fluid inlet Temp. °C 450 max.550
Sampling fluid Outlet Temp. °C max.50
Sampling fluid Inlet pressure barg max.150
Sampling fluid capacity Lit/hr max.60
Cooling fluid Water
Cooling fluid Inlet temperature °C 30.0 max.40
Cooling fluid Inlet pressure
barg 8
Cooling fluid capacity Lit/hr 2400.0
Heat exchanger type Coil
Coil theoretical proof design pressure barg max.400
Coil design temperature °C max.550
Shell design pressure barg max.50
Shell design temperrature °C 100
Heating surface m2 0.5
Shell material A240 - TP 304L Eq. SUS 304L
Tube A 312 - TP 316 L Eq. SUS 316 L



Pressure and material will be finalized by FAP based on project.
  

  source
 http://dangstars.blogspot.com/2014/06/three-pass-fire-tube-boilers.htm