Direct Fired Heater Efficiency

The most efficient and cleanest combustion occurs when the amount of air and fuel are in ideal stoichiometric proportions.

Direct fired heater efficiency.

Direct fired benefits efficiency as nearly 100 of the fuel is being converted to heat fuel consumption and operating costs are reduced. Fired heaters account for 37 of the u s. Then the final step is to find the heat efficieny by simply dividing lhv amount of heat possesed by fuel because of temprature at the inlet air temprature at the inlet amount of heat possesed by steam at the inlet amount of heat releaed at stack with flue gases 1 heat loss assumed in radiation section divided by lhv amount of heat possesed by fuel because of temprature at the inlet air temprature at the inlet amount of heat possesed by steam at the inlet. Manufacturing energy end use doe mecs 2002.

Efficiency direct fired heaters convert 100 of the fuel being used to direct heat which lowers fuel consumption and operating costs easy to transport direct fired heaters are fairly simple pieces of equipment that can be moved to where heat is needed. Fired heaters designed for refinery applications are generally designed for allowable average radiant heat flux q r which is one of the most closely watched design factors of fired heaters for given process application for determination of average radiant heat flux it is necessary as a first step to determine the radiant heat duty q r all of existing well established 1dquasi theoretical. Energy information administration eia data that means the total energy end use in fired heaters is over 7 quadrillion btu excluding offsite and in plant distribution losses. These heaters are 100 combustion efficient with an overall thermal efficiency of 92 8 heat loss due to water formation during combustion.

While specific designs may take many different forms the basic fired heater design uses burners to heat fluid flowing through tubes. Benefits to using direct fired heaters include. The guidelines and procedures included herein are appropriate for a typical direct fired heater of the types found in refineries and gas plants and is not expected to include specialty heaters or furnaces that include reaction in the tubes due to heat or catalysts. Direct fired heaters sigma thermal offers convection style api 560 and non api radiant convective heaters from 1mm to 80mm btu hr.

We will assume that for this discussion that the heater design will need. Ideally for a natural gas fired unit one molecule of methane and two oxygen molecules react to form one carbon dioxide and two water molecules. A direct fired heater is a style of heater in which a burner provides hot gasses that transfer their heat energy to a process liquid or gas flowing directly through coils installed inside the heater vessel. In a radiant convection heater the heating process starts in the radiant section designed to yield efficiency in a minimal space.

These heaters are 100 combustion efficient with an overall thermal efficiency of 92 8 heat loss due to water formation during combustion. The most common direct fired heater combines the intense heat capabilities of the radiant heater with the even heat distribution of the convection heater by using both types of coils in tandem within one system. Guidelines for vertical cylindrical fired heater design.