Modelling a SOFC Power Unit Using Natural Gas Fed Directly

Natural gas is transported through a network of main gas pipelines under high pressure, and the process of its consumption requires a decrease in pressure of gas laid mainly in throttling devices. It is beneficial to use part of the available energy potential of natural gas for electricity production by means of expander-generator technologies. However, the task of finding ways to increase the capacity and efficiency of gas turbine power units using the energy of excess pressure of natural gas does not lose its relevance. The study poses and solves the problem of developing a new thermal cycle diagram of a combined power unit to substitute throttling pressure regulators at gas distribution stations with an expander-compressor gas turbine unit. A distinctive feature of the unit is the replacement of the gas turbine drive of the air compressor with its drive from the turbo-expander by using the energy of excess pressure of natural gas. This results in significant increase in the absolute thermal efficiency and decrease in the specific fuel and energy costs. We developed analytical dependencies relating the operating parameters of the expander-compressor gas turbine unit and its output characteristics. Thus, it was possible to find an approach to calculating the unit, the approach being based on proven methods for thermal cycle calculation. The results of the performed calculations show that, in comparison with gas turbine units, the expander-compressor gas turbine unit has a significantly lower specific consumption of equivalent fuel and a lower negative impact on the environment

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Power Unit Modification to Accommodate Interruptible Flow of Natural Gas

Transactions of the ASAE ◽

10.13031/2013.35567 ◽

1977 ◽

Vol 20 (3) ◽

pp. 0406-0407

Author(s):

J. A. Miles

Keyword(s):

Natural Gas ◽

Power Unit

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RESEARCHES OF ECONOMIC INDICATORS OF WORK MODERNIZED RAH-98

Energy Technologies & Resource Saving ◽

10.33070/etars.4.2017.05 ◽

2017 ◽

pp. 27-34

Author(s):

Yo.S. Mysak ◽

M.F. Zayats ◽

T.I. Rуmar

Keyword(s):

Natural Gas ◽

Power Unit ◽

Power Plants ◽

Combustion Products ◽

Fuel Oil ◽

Stable Mode ◽

Load Variation ◽

Mode Of Operation ◽

Two Stages ◽

Efficiency And Reliability

An analysis of the existing methods and schemes of heating the air by combustion products in the tailings of the heating boiler indicates that such measures provide an opportunity to increase the efficiency and reliability of power plants, as well as increase the efficiency of boiler plants. This paper considers the results of the study of the economic performance of the modernized RAH-98 boiler TGMP-314 A 300 MW on natural gas in the range of load variation of the power unit 160–260 MW and on the fuel oil in the range of load variation of the power unit 200–260 MW. Experiments were carried out at a stable mode of operation of the boiler in two stages: for the off and for the included scheme of suction environment from the seals of RAH. The average increase in the efficiency of the boiler is 0.35 % gross during operation of the boiler, both on natural gas and on fuel oil in the specified range of loads. Absorption of air in RAH for loads of the power unit 160–260 MW for the included circuitry is reduced by 7 % on average compared to the disconnected circuit. Bibl. 10, Fig. 5.

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Furnace operation in the substitution boiler for the Novocherkassk GRES 300 MW power unit while burning anthracite culm-natural gas mixture

Thermal Engineering ◽

10.1134/s0040601506060048 ◽

2006 ◽

Vol 53 (6) ◽

pp. 423-427

Author(s):

V. A. Dvoinishnikov ◽

V. P. Knyaz’kov ◽

V. A. Galkov ◽

A. N. Bezgreshnov ◽

G. I. Kalmykov ◽

...

Keyword(s):

Natural Gas ◽

Power Unit ◽

Furnace Operation ◽

Gas Mixture ◽

Anthracite Culm

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The prospect of using greek lignite in an energy portfolio related to power generation

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.11107 ◽

2013 ◽

Vol 47 (4) ◽

pp. 2121 ◽

Cited By ~ 1

Author(s):

C. Papanicolaou ◽

J. Typou ◽

J. Ioakeim ◽

Th. Kotis ◽

A. Foscolos

Keyword(s):

Power Generation ◽

Natural Gas ◽

Co2 Emissions ◽

Power Unit ◽

Power Output ◽

Power Plants ◽

Annual Income ◽

Income Loss ◽

Cost Of Energy ◽

Reduce Emissions

The lignite-based power generation contributes 38% towards Greece’s energy independence. Reducing the lignite use while simultaneously importing more expensive natural gas both government deficit and the cost of energy will increase. This surcharge is passed to consumers. Switching to renewable resources invokes an even greater fiscal imbalance, since the costs from the use of wind turbines and solar photovoltaic panels are 87 €/MWh, and 180–284 €/MWh respectively, while natural gas stands at 95 €/MWh and lignite-derived energy is 45 €/MWh.In case of replacing a 300 MW lignite fed power unit with a 300 MW natural gas fed power unit, the loss in income will be 66,540,000 €/year. Coupled with the increased cost of natural gas (31,800,000 €/year) the total is 98,340,000 €/year in addition to the loss of 1235 jobs.Greek authorities intends to replace lignite-fired plants having a total installed capacity of 2531 MW with equivalent natural gas-fired plants resulting in annual total deficit in excess of 787 M€. The targets set by the Greek Ministry of Energy and Climatic Changes to reduce emissions include halving Greek lignite-derived power output from 4800 MW to 2300 MW (>-52%). This move simultaneously increases Greek energy dependence on expensive foreign energy sources and will potentially provoke social unrest at the loss of 12500 jobs with loss of annual income on the order of 670 M€. However, if the existing power output from lignite-fed power plants is maintained, the penalty that PPC (Public Power Corporation) has to pay for the resultant CO2 emissions is significantly smaller (300 M€ at 7.5 €/t of emitted CO2/GWh.Proceeding with the immediate reduction in lignite-fired energy results in economic and social catastrophe (annual income loss:-670 million € + annual CO2 emissions penalty: 348 M€= -322 M€). Lignite-fired plants will become obsolete only when the CO2 emissions penalty exceeds 63.5 €/t of emitted CO2/GWh from a purely economic perspective.

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