UNITHERM´S FOUR PASS ECONOMICAL SOLID FUEL FIRED THERMIC FLUID HEATER

Capacitiess – 4 lac Kcal to 40 Lac Kcal/Hr

DESIGN: The Unitherm system is a closed loop heating system operating at near atmospheric pressure with temperatures as high as 3000C .The System comprises of closed loop circulating of hot mineral oil through the user equipment for process heating and the return oil is reheated in the Thermic fluid Heater. There are two separate heating sections, namely Radiant & Convective Heat exchangers. The expansion cum dearation tank ensure pressure less and vapor free system.

The Thermic fluid heater is of VERTICAL construction with a large diameter helical coil Placed directly on top of the combustion furnace. This ensures that the intense luminous heat of the flame is fully utilized. This is the first, Radiative section comprising of the first pass of hot flue gases.

These gases from radiant coil are then made to pass through a second, convective heat exchanger. This is made of twin concentric helical coils, placed inside a sturdy M.S. shell having three distinct passes of hot gases in the convective section where maximum amount of heat is extracted from the flue gases. The gases are then made to pass through the Air prehater & Mechanical dust collector, on way to the chimney through I.D.Fan. A generously designed refractory lined external furnace is provided to ensure high furnace volume and grate area and can ensure rated output on low-grade coal and can easily burn most other fuels such as Lignite, Paddy husk, Fire wood, Bagasse, etc, without any modifications.

Product Feature	User Benefit
Four Pass Design	Higher efficiency than 3 pass design , Lower fuel cost
Multiple passes on Thermic fluid Side	Low pressure drop, More head available for process
Higher Hea transfer area per Lac Heat Output	Ensures rated output on most fuels Longer Coil life Longer Thermic Oil life
Coil made from 9 Gauge, 3.66 mm Boiler Tubes	Longer Coil life
Larger grate area & free board space	Efficiently burns most low grade fuels Ensures rated output
Diesel Engine	Ensures circulation through coil during power failure Longer Coil life Higher oil life
Multiple safety features	Safe & trouble free operation through the life of the Heater

Abnormal Condition	Safety Action
Low Thermic Fluid Level in Expansion Tank	Level Switch actuated at expansion tank cuts of the ID Fan / FD Fan.
Low Thermic Fluid Flow	Differential pressure switch (DPS) across inlet and outlet headers cuts of the ID Fan slowing down combustion
Thermic Fluid system pressure high due to system valves closure etc.	Pressure switch cuts of ID Fan and alarm. Safety relief valve (Optional) to be provided in the system piping so as to by pass the oil.
Higher Hea transfer area per Lac Heat Output	Ensures rated output on most fuels Longer Coil life Longer Thermic Oil life
Coil made from 9 Gauge, 3.66 mm Boiler Tubes	Longer Coil life
Larger grate area & free board space	Efficiently burns most low grade fuels Ensures rated output
Diesel Engine	Ensures circulation through coil during power failure Longer Coil life Higher oil life
Multiple safety features	Safe & trouble free operation through the life of the Heater

Model	UTF A 400	UTF A 600	UTF A 1000	UTF A 1500	UTF A 2000	UTF A 2500	UTF A 3000	UTF A 4000
Output	400000	600000	1000000	1500000	2000000	2500000	3000000	4000000
Coal Consumption	98	146	245	365	490	610	735	970

Coal Consumption in Kgs/Hr based on GCV of Coal 5500 Kcal/Kg