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ENERGY SAVING TURBOEXPANDERS (UTDU)
Energy saving turboexpanders (UTDU) are intended for production of electric power by recuperation of energy of natural gas excess pressure at units of its reduction - gas-distribution stations (GDS), at gas distribution points (GDP) of heat power plants and large industry companies.
At present «Turbogaz» JSC manufactures energy saving turboexpanders of own design with different power: 8kW, 300 kW, 500 kW, 1ÌW, 2,5ÌW; 4ÌW; 5ÌW; 6ÌW; 8ÌW; 12ÌW for input gas pressure to 7.5 ÌPà and with gas flow of 0.05-6 mln. nm3/24 h.
Theoretical researches and practical experience show, that natural gas excess pressure energy saving by turboexpanders greatly corresponds to tasks of energy saving as economy of fuel for electricity production and improvement of ecology environment.
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| UDEhU-2500-UKhL4 unit (TEhTs-4, Minsk, Republic of Belorussia)
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| Building with two UDEhU-2500-UKhL4 units
(TEhTs-4, Minsk, Republic of Belorussia)
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| Generator UDEhU-2500-UKhL4 (TEhTs-4, Minsk, Republic of Belorussia)
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| UDEhU-2500-UKhL4 unit (GDP-2, Novolukoml, Republic of Belorussia)
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| UDEhU-4000-UKhL4 unit (TEhTs-2, Gomel, Republic of Belorussia) |
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| UDEhU-2500-UKhL4 unit
(GDS, Severodonetsk, Ukraine)
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Joint company by order of National joint-stock company «Naftogaz of Ukraine» performed technical feasibility analysis of implementation of energy save turboexpander into gas transportation system of Ukraine.
Results of the above-mentioned scientific work were reflected in the decision of the Cabinet of Ministers of Ukraine dated July 27, 2006 No.436-ð, according to which for realization of energy strategy of Ukraine is intended implementation of 54 energy saving turbine expanders at GDS of National joint-stock company «Naftogaz of Ukraine» before 2030.
For performance of this order «Turbogaz» PJSC was ordered development and supply of two installations UTDU-4000-UKhL4, with power of 4000 êW each, at GDS of Zaporozhye and Severodonetsk. In 2008 was introduced into operation energy saving turboexpander at GDS of Severodonetsk, and at GDS of Zaporozhye was performed supply of the equipment.
The biggest technical-economical effectiveness of use of turboexpanders can be achieved at combined manufacturing of electric power and cold. At GS «Solokha» GPU «Poltavgazdobycha» is implemented one-of-a-kind energy installation UDEhU-2500, with power of 2500 kW, intended for obtaining of cold at temperature level minus 30°Ñ in the diagram of low temperature absorption with hour/year and output of simultaneous electricity production – 13024.8 thousd. kW of liquefied propane-butane fraction – 85.95 thousd. t/year, gas gasoline – 56.28 thousd. t/year, diesel fraction – 23.49 thousd. t/year. Payback period of this unit is maximum one year.
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| Scheme of binding turboexpander power-station combined with gas-turbine power station to gas-distributing station |
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| Scheme of binding to Gas-distribution station with external heat source |
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| Scheme of binding to Gas-distribution station with independent heat source |
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Main advantages of electric power stations based on UTDU:
- incremental cost of potential power, created by UTDU, is approximately 3 times less, then at creating of similar powers by traditional gas or steam turbines
- heat input per 1 kW of produced electrical power is 2-3 times less than heat expenses in steam- and gas turbine units
- gas economy (relative) to 60%
- full absence of solid emissions, emissions of nitrogen oxides and sulfur into the atmosphere and emptying of process waters
- efficiency factor is 0.7 to 0.8
- short terms of payback - 2.5 to 5 years
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