Product Range: Heat Exchanger (F.D. COOLER) (go back)
F.D. COOLER
COMPARATIVE STATEMENT BETWEEN OUR DESIGN AND CONVENTIONAL DESIGN OF COOLING SYSTEM
ENVIRO CARE FILTRATION & SYSTEMS |
CONVENTIONAL |
DESIGN BASIS |
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Gas flow through inside of cooling tube |
Gas flow through outside of cooling tube |
Cooling tubes of vertical design having very large diameter (100 NB) with zero chance of dust accumulation. The velocity through the tube can be properly maintained. |
Cooling tubes are of horizontal design having narrow diameter. The velocity of dusty air inside the heat exchanger casing reduces substantially due to larger cross sectional area and dust settlement takes place in the tube bundle (inter-tubular space) leading to choking. This needs regular cleaning / maintenance which is very difficult in case of triangular pitch arrangements for tubes. |
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COOLING BASIS |
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Utilizations of all three modes of heat transfer i.e. radiative, conductive and convective simultaneously |
Utilization of convective heat transfer only followed by conductive heat flow. |
Multidirectional flow of both the hot air as well as cooling air for best utilization of LMTD ((logarethemic mean temperature difference) of flow |
Unidirectional flow of gas thus utilization of arithmetic temperature difference only. |
The tubes are attached in the tube sheet with provision for thermal expansion. |
The tubes are welded to the tube sheet on either side resulting in frequent bending and breakage due to thermal expansion. |
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COOLING SURFACE |
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Higher cooling surface provided |
Lower cooling surface provided |
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OPERATION |
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Zero explosion probability |
High explosion probability as dust contains unburnt carbon and fire had been observed on the outer surface of tube bundle in the hot section in many installations. |
Cooling air supply is provided with the help of 6 nos. Axial Flow Fans located at the clean air plenum itself. This provides better flexibility and depending upon the outlet temperature, number of Fans can be switched off from your PLC which will eventually save power. |
Cooling air supply is made by 2 or 3 nos. Centrifugal Fans and hence flexibility is less. |
No requirement of compressed air for the system thus no requirement of any compressor load |
Adequate quantity of compressed air required for dust removal manually for which a regular requirement of compressed air is associated with the system thus increasing the compressor load as well as main power requirement at high risk zone. |
Due to its superiority in design (particularly eliminating the possibility of choking of dust and admixing of dilution air) the total tonnage of the equipment is higher than that of conventional design |
For lower cooling surface vis-à-vis cooling efficiency fabrication tonnage is automatically lower. |
Our Ref. ECFS/08 – 09/SSRK STEEL/5010
Date : 02 June, 2008
FD COOLER FOR 1X100 TPD KILN
GENERAL INFORMATION ON HIGH PERFORMANCE FORCE DRAFT COOLER
- Unlike the gas conditioning tower, this doesn’t require water and waste disposal is not at all an issue.
- Operational cost is less.
- There will be 6 nos. FD Fans for cooling. Hence more flexibility in regulating air flow to maintain accurate exit temperature.
- Cooling tube banks are of vertical design with no chance of dust accumulation.
- Maximum cooling surface provided.
The FD Cooler will have 6 nos. of cooling modules. The hot gas will pass through vertical tubes and ambient air will be blown over the tube in six modules for cooling the gas. There will be two passes in the hot gas side. Please note that in our design ( i.e, vertical tube type ) there will not be any tube chokeage problem resulting in loss of heat transfer co-efficient which is observed in conventional design where cold air is passed through horizontal tube bundle and hot flue gas is blown over the tubes. Therefore, the conventional design is inefficient and very much maintenance prone.
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