Journal Name:
- International Journal of Science and Engineering Investigations
| Author Name | University of Author |
|---|---|
Abstract (2. Language):
ndirect fired water bath heaters are found in a wide
range of applications in gas industry. Natural gas is transferred
in high pressure in order to reduce the pipeline’s sizing. As
consumers need gas in lower pressure, it should be reduced in
gas pressure reduction stations. The main application of
indirect heaters is to heat high pressure gas prior to pressure
reduction. This prevents hydrate formation that can occur
because of the temperature drop due to the Joule-Thompson
effect. In recent years, because of energy crisis and
environmental problems due to fossil fuels, the necessity of
optimizing these high consumption devices is more evident
than past. In this paper one city gate station located in
Mahshahr city has been considered as a case study. Heat losses
and efficiency of the heater installed in this station has been
calculated. Heater efficiency was obtained about 52% that is
not acceptable. Therefore a solar system has been proposed to
provide part of heat demand. Proposed system includes an
array of solar collectors with a storage tank. The system is
capable to save more than 39000m
3
of NG in a year.
Afterwards, the processes that lead to heat natural gas in
indirect fired water bath heaters have been modeled. Therefore,
using heat loss from stack for preheating the necessary air for
combustion has been investigated. At the end, a cycle to
generate power from the thermal energy of flue gases has been
modeled. The results show that heating the combustion air will
decrease fuel consumption and increase heater efficiency.
Moreover, with considering the proposed system as a power
plant, 168MWh power can be generated in a year that causes
considerable income for the station
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