Abstract
A new original basic process circuit of a fuel-free trigeneration plant simultaneously producing electricity, heat, and cold is considered. The plant can be used at technological transported gas pressure reduction stations instead of throttle devices conventionally used for this purpose. The plant process circuit involving, as its key components, an expander–generator unit and a vapor compression thermotransformer (VPTT) configured for simultaneously producing heat and cold, along with its operating principle, is described. The flow of transported gas (without combusting it) serves as the primary energy carrier supporting the plant operation. The gas flow energy is converted in mechanical work (as its pressure is decreased in the expander from the initial level at which gas arrives to the technological gas pressure reducing station to the level necessary according to the requirements of the gas utilization technology at the consumer end), and the generator connected to the expander converts this work into electricity. Part of the produced electricity is supplied to an external consumer, and its other part is used for driving the VPTT. The gas flow downstream of the expander supplied to the consumer and the flow of the VPTT working fluid, which takes heat from the cold carrier in the VPTT evaporator as it is transferred from a liquid to a gaseous state serve as the sources of cold in the plant. The working fluid downstream of the VPTT compressor serves as the source of heat; part of this is supplied to the consumer and its other part is used for heating gas upstream of the expander. The article presents the results from studying the effect the temperature to which gas upstream of the VPTT expander is heated by the heat of the VPTT working fluid has on the plant thermodynamic efficiency. The exergetic efficiency is taken as the thermodynamic efficiency criterion. The processes occurring in the plant when changing the gas heating temperature are subjected to a qualitative analysis. The results of calculations carried out using the plant mathematical model described in the article are presented. The obtained calculation results made it possible to determine the effect that the gas heating temperature upstream of the VPTT expander has on the specific (per unit flowrate of transported gas) electric, heating, and refrigeration capacities of the plant; on the specific exergy values of the same flows; and on the exergetic efficiency subject to the conditions adopted in the calculations.
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References
A. P. Klimenko, Candidate’s Dissertation in Engineering (Moscow, 1955).
A. P. Klimenko, “The use of differential pressure of natural gas,” Tr. Inst. Ispol’zovaniya Gaza Akad. Nauk Ukr. SSR, No. 9 (1960).
A. A. Stepanets, I. T. Goryunov, and Yu. L. Gus’kov, “Energy-saving complexes on the basis of the use of differential pressure in gas pipelines,” Teploenergetika, No. 6, 33–35 (1995).
H.-G. Fasold and H.-N. Wahle, “Gasentspannung in Expansionsmaschinen unter Beruecksichtigung des Realgasverhaltens,” Gas-Erdgas gwf (BRD). 136 (6), 261–269 (1995).
V. P. Mal’khanov, A. A. Stepanets, and V. N. Shpak, “Expander-generator sets developed by JSC "Kriokor” for utilization of excess pressure of natural gas,” Khim. Neft. Mashinostr., No. 4 (1977).
V. S. Agababov, E. K. Arakelyan, A. V. Andryushin, Yu. L. Gus’kov, V. V. Kudryavyi, A. V. Koryagin, and A. A. Stepanets, “Influence of a expander-generator unit on thermal efficiency of a combined heat-andpower plant,” Elektr. Stn., Special Issue, 77–82 (1997).
P. Cronin, The Application of Turboexpanders for Energy Conservation. Company materials (Rotoflow Corporation, 1999).
V. S. Agababov, “The effect of gas-expansion power units on the thermal efficiency of condensing power stations,” Therm. Eng. 48, 310–314 (2001).
V. S. Agababov, A. V. Koryagin, and V. V. Agababov, “Determination of the energy efficiency of using expander-generator unit in gas supply systems,” Izv. Vyssh. Uchebn. Zaved. Probl. Energ., No. 9–10, 53–60 (2001).
V. S. Agababov and A. V. Koryagin, “Determining the energy efficiency of an expander–generator unit in gas supply systems,” Teploenergetika, No. 12, 35–38 (2002).
Yu. L. Gus’kov, V. S. Agababov, Yu. A. Davydov, A. V. Koryagin, and V. V. Malyanov, “Practice of operation of expander-generator units at Mosenergo CHPPs. Historical overview,” Elektr. Stn. 10, 159–166 (2003).
V. S. Agababov, A. V. Koryagin, and A. Yu. Arkharova, “Comparative analysis of the various techniques of gas heating in the expansion-generator unit on the thermal efficiency of a thermal power plant,” Izv. Vyssh. Uchebn. Zaved. Probl. Energ., No. 1–2, 11–21 (2005).
A. V. Klimenko, V. S. Agababov, P. N. Borisova, and S. N. Petin, “Thermodynamic efficiency of using expander-generator units at stations of technological pressure reduction of transported natural gas,” Teplofiz. Aeromekh. 24, 961–968 (2017).
V. S. Agababov, Patent RF No. 2150641, MPK 7 F25 B 11/02, F 01 K 27/00, Byull. Izobret. No. 16 (2000).
V. S. Agababov, Doctoral Dissertation in Engineering (Moscow Power Engineering Inst., Moscow, 2003).
V. S. Agababov, A. A. Rogova. Yu. O. Baidakova, and I. P. Il’ina, “Non-fuel units for joint electricity, heat and cold production,” Energosberezhenie Vodopodgot., No. 4, 66–69 (2012).
A. V. Klimenko, V. S. Agababov, V. D. Rozhnatovskii, Yu. O. Baidakova, A. A. Rogova, and P. A. Tideman, “Estimation of technical and economic efficiency of trigeneration in the combined-cycle unit with a steam compression heat pump,” Nov. Ross. Elektroenerg., No. 12, 5–14 (2013).
V. S Agababov, Yu. O. Baidakova, A. V. Klimenko, U. I. Smirnova, R. N. Taktashev, Patent RF No. 158931, Byull. Izobret. No. 18 (2016).
V. S. Agababov and P. N. Borisova, “Layout of the unit for fuel-free generation of electricity and cold,” Nov. Ross. Elektroenerg., No. 8, 29–37 (2016).
V. S. Agababov and P. N. Borisova, “Thermodynamic analysis of the scheme of the fuel-free unit for simultaneous generation of electricity and cold,” Energosberezhenie Vodopodgot., No. 4 (102), 39–45 (2016).
A. V. Klimenko, V. S. Agababov, A. V. Koryagin, and Yu. O. Baidakova, “Refrigeration generation using expander-generator units,” Therm. Eng. 63, 342–348 (2016). doi 10.1134/S0040601516050037
A. V. Klimenko, V. S. Agababov, I. P. Il’ina, V. D. Rozhnatovskii, and A. V. Burmakina, “Layouts of trigeneration plants for centralized power supply,” Therm. Eng. 63, 414–421 (2016). doi 10.1134/S0040601516060045
A. V. Klimenko, V. S. Agababov, and P. N. Borisova, “On the possibility of generation of cold and additional electric energy at thermal power stations,” Therm. Eng. 64, 422–428 (2017). doi 10.1134/S0040601517060015
V. M. Brodyanskii, Exergy Method of Thermodynamic Analysis (Energiya, Moscow, 1973) [in Russian].
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Original Russian Text © A.V. Klimenko, V.S. Agababov, P.N. Borisova, S.N. Petin, A.V. Koryagin, 2018, published in Teploenergetika.
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Klimenko, A.V., Agababov, V.S., Borisova, P.N. et al. A Fuel-Free Trigeneration Plant at Stations for Technological Reduction of Transported Natural Gas Pressure. Therm. Eng. 65, 791–798 (2018). https://doi.org/10.1134/S0040601518110046
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DOI: https://doi.org/10.1134/S0040601518110046