Indirect Bath Heater Water expansion tank

Indirect bath heaters are mainly used in the oil and gas industry to heat process fluids. The mechanism takes place indirectly through a bath (utility bath) as opposed to heating directly by flame or furnace (direct fire-tube heaters).  The use of a bath promotes uniform heating and reduces the chance of hotspots. Due to the indirect nature of bath heaters the safety risks are much lower (combustible streams isolated) compared to direct fire-tube heaters, they can therefore be used in hazardous areas where safety is a concern.

The “indirect” name comes from the fact that a fire-tube is submerged in a bath that provides Water expansion tank heating through the bath Tube-fire heater medium to a submerged coil containing the process stream. Usually the bath fluid is water but depending on the climate and heating requirements it can also be oil (capable Pressure drop in gas of heating process fluids to higher temperatures) or a mixture of water and glycol (used in colder climates Water expansion tank to lower the freezing point).

Hotspots often occur in direct fire-tube heaters Indirect water heater as a result Tube bundle of carbon build up on the fire side of the tubes. If left unchecked this build up can be a source Water expansion tank of process fluid degradation and may lead to ruptures, explosions and leaks.

Typically, FARAN’s Burner water bath indirect bath heater Pressure drop in gas s achieve around 50-55% heating efficiency Tube-fire heater . This relatively low efficiency compared to direct fire-tube heaters is a result of the number of heat transfer steps involved. Typically Burner water bath indirect bath heaters are used where the flow rate of the process stream is low and operations Process fluid degradation may be unattended, they could also be used to prevent coke formation on the tubes when low heat Pressure drop in gas fluxes are required.

Variety of applications:

1.     Gas dew point heating: Indirect water heater high-pressure natural Heating efficiency gas heating upstream pressure regulation stations preventing condensation phenomena Gas condensate due to Joule-Thompson effect.

2.     Heating of high-pressure natural gas upstream pressure regulation in order to prevent external icing formation.

3.     Fuel gas Natural draft heat exchanger super-heating upstream gas turbines.

4.     Gas heating Indirect water heater downstream low temperature storages.

5.     Hydrate prevention.

6.     Viscosity Gas condensate reduction: Crude oil heating treatments to facilitate degassing and dewatering.

FARAN’s Indirect Bath Heaters main parts:

-       Main body

-       The coil or tube bundle Radiant and convective

-       The water Pressure drop in gas expansion tank

-       The fuel Natural draft heat exchanger feed line

-       Burner (gas type, oil type or bi-fuel)

-       The fire-tube

-       Chimney

-       Burner management Forced draft heat exchanger system panel

-       Skid frame Tube-fire heater and service platform

-       Insulation

The heater shell Indirect glycol heater contains the fire-tube that allows a rapid heat transfer (both radiant and convective) Uniform heating from the flame to the hot medium. The heat is transferred from the bath to the coil / tube bundle and the safely to the gas or the oil. The expansion tank allow the hot medium to be contained for the Heating efficiency thermal expansion due to the temperature increase. Level gauges and transmitters advise when additional Gas condensate water or hot medium is required and give alarms in case of overfilling.

Forced draft Vs Combustion stream natural draft:

Natural draft burner relies on a stack to create negative pressure at the burner inlet, Heating efficiency which induces as much air as is required for combustion. These heaters are popular for remote Uniform heating locations and/or locations with limited or even no power supply available.

Forced draft heaters are ideal whenever there is a low emission requirement, utilizing small bore fire-tubes in conjunction Furnace gas heating with a combustion air fan. High velocities in small bore fire tube reduce the dead gas film region Tube-fire heater along the fire walls. This results in a reduced tube areas compared to their large bore counterparts, Gas condensate therefore, overall heater size is minimized creating a significantly smaller footprint while offering Heating efficiency superior burner control compared to natural draft style heaters.

FARAN Process & Energy Pressure drop in gas engineering company is able to design and manufacture different size of indirect water bath heater  which vary from 90 kW up to 10MW.