scholarly journals Thermochemical Heat Recovery Based on External Heat Engine

2015 ◽  
Vol 12 (3) ◽  
pp. 3027-3039
Author(s):  
Valery Kirillov ◽  
Alexandr Samoilov ◽  
Alexey Shigarov ◽  
Denis Ivanov ◽  
Dmitry Vladimirovich
Keyword(s):  
Heat Recovery ◽  
Heat Engine ◽  
External Heat ◽  
Thermochemical Heat Recovery

scholarly journals ОСОБЕННОСТИ ПРИМЕНЕНИЯ ПРОДУКТОВ КОНВЕРСИИ МЕТАНОЛА В СУДОВОЙ ГАЗОТУРБИННОЙ УСТАНОВКЕ С ТЕРМОХИМИЧЕСКОЙ РЕГЕНЕРАЦИЕЙ СБРОСНОГО ТЕПЛА

2019 ◽  
pp. 28-34 ◽  
Author(s):  
Александр Константинович Чередниченко
Keyword(s):  
Energy Efficiency ◽  
Gas Turbine ◽  
Heat Recovery ◽  
Power Plants ◽  
Low Carbon ◽  
Steam Conversion ◽  
Working Pressure ◽  
Fixed Temperature ◽  
Heat Potential ◽  
Thermochemical Heat Recovery

The research’s subject is the processes of energy transformation of fuel in the ship gas turbine plant with thermochemical regeneration. Modern approaches to assessing the energy efficiency of ship power plants were considered. The characteristics of traditional and alternative marine fuels were analyzed. The use of methanol as a low-carbon marine fuel is discussed. It is proposed to increase the efficiency of methanol use by using synthesis gas obtained through thermochemical heat recovery of secondary energy resources of ship engines. The main objective of the study is to analyze the effects on the energy efficiency of steam thermochemical transformation of methanol of the limitations associated with the system of supplying gaseous fuel to the engine. The influence of pressure in the thermochemical reactor on the steam’s efficiency of reforming of methanol was analyzed. The design schemes of two variants of the ship gas turbine installation with thermochemical heat recovery by steam conversion of methanol are presented. The methanol conversion efficiency was determined by the heat potential of the exhaust gases and was calculated based on the thermal balance of the thermochemical reactor. The reactor’s model is two- component. The mathematical model of the turbocompressor unit is based on an enlarged calculation taking into account the total pressure loss in all elements of the gas-air duct. The results of mathematical modeling of processes in plants based on gas turbine engines of simple and regenerative cycles under conditions of fixed methanol’s consumption, the fixed temperature of the gas in the turbine’s front for environmental parameters according to ISO 19859: 2016 are presented. The efficiency of the scheme which used steam conversion of methanol at pressures corresponding to the working pressure in the combustion chamber was revealed. The increase in the energy efficiency of the installation is 3 ... 5 % with basic parameters and 10 ... 11 % for higher conduction temperatures or for catalytic reactors. The research results can be used in the promising power plants designing.

scholarly journals EXERGIC EFFICIENCY OF THE HEAT RECOVERY UNIT FOR WASTE GASES OF A HEAT ENGINE OF A COGENERATION PLANT

2020 ◽  
Vol 42 (3) ◽  
pp. 56-60
Author(s):  
N. Fialko ◽  
A. Stepanova ◽  
R. Navrodskaya ◽  
S. Shevchuk
Keyword(s):  
Heat Exchanger ◽  
Heat Recovery ◽  
Exergy Analysis ◽  
Heat Engine ◽  
Cogeneration Plant ◽  
Advantages And Disadvantages ◽  
Recovery Unit ◽  
Recovery Schemes ◽  
Exergy Losses ◽  
Complex Methods

The paper presents the results of a study of the efficiency of a heat recovery unit for waste gases of a heat engine of a cogeneration plant. The possibilities of using for this purpose the discrete-modular principle and complex methods of analyzing the efficiency of heat recovery systems, which are based on the methods of exergo-dissipative functions and exergic balances, are analyzed. The design features of the heat exchanger are considered and a conclusion is made about the possibility of presenting it as a system of eight discrete modules. The results of calculating the exergy characteristics for each of the eight heat exchanger modules, performed within the framework of the indicated methods, are presented. A regular decrease in exergy losses and heat-exergy criterion of efficiency is observed during the transition from the first to the eighth module of the heat recovery unit. However, exergy characteristics for the third and fourth modules of the heat exchanger are somewhat higher than the indicated dependence suggests. This indicates the thermodynamic imperfection of these modules. The main exergy losses in all heat exchanger modules are associated with losses due to heat transfer from flue gases to the wall. An insignificant discrepancy between the values ​​of the total exergy losses calculated within the framework of the methods used indicates that both methods can be used in various heat recovery schemes. However, in each specific case, it is necessary to choose a methodology with which it is possible to identify individual elements that need optimization or constructive improvement. Particular attention is paid to the comparative analysis of the selected techniques and consideration of the advantages and disadvantages of their use in various cases. It is noted that the technique based on the integral balance method of exergy analysis can be considered effective due to the small number of initial parameters and the simplicity of the analytical and calculation methods. The advantage of the technique using exergo-dissipative functions is that it allows one to differentiate exergy losses in a heat exchanger and establish the causes and areas of their localization.

scholarly journals Low-Grade Waste Heat Recovery via an Osmotic Heat Engine by Using a Freestanding Graphene Oxide Membrane

ACS Omega ◽  
2018 ◽  
Vol 3 (11) ◽  
pp. 15501-15509 ◽  
Author(s):  
Xin Tong ◽  
Xin Wang ◽  
Su Liu ◽  
Haiping Gao ◽  
Runlong Hao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Heat Engine ◽  
Low Grade ◽  
Oxide Membrane

Heat recovery from a cement plant with a Marnoch Heat Engine

2011 ◽  
Vol 31 (10) ◽  
pp. 1734-1743 ◽  
Author(s):  
P. Saneipoor ◽  
G.F. Naterer ◽  
I. Dincer
Keyword(s):  
Heat Recovery ◽  
Heat Engine ◽  
Cement Plant

A scaling study of a combined microcombustor and heat engine system

2005 ◽  
Vol 219 (5) ◽  
pp. 371-381 ◽  
Author(s):  
R. B. Peterson
Keyword(s):  
Heat Recovery ◽  
Heat Engine ◽  
System Efficiency ◽  
Thermal Loss ◽  
Engine Model ◽  
Ideal System ◽  
Exhaust Stream ◽  
Power Point ◽  
High Degree ◽  
Loss Mechanisms

A general heat engine model is developed for determining the scaling characteristics of small combustion-driven energy systems. The model is composed of a Carnot heat engine and a combustor operating at a specified temperature dictated by the thermodynamic maximum power point. Considerations have been made for thermal conduction losses to the surroundings and heat recovery from the exhaust stream of the combustor. Modelling of the conduction heat loss is necessary due to the increased importance of this effect upon a reduction in size. This model is used to determine the ideal system efficiency as a function of characteristic length. This length is then varied from mesoscale dimensions to the microscale with the overall system efficiency being determined at each point. The scaling study provides a sense for the ultimate size limitations imposed on combustion-driven engines due to thermal loss mechanisms to the surroundings. Although a high degree of idealization is employed, this analysis shows that submillimetre engine/combustor systems appear impractical, but characteristic sizes in the range of a few millimetres are feasible, at least in regards to the thermal loss mechanisms. This study also shows that systems having a conduction parameter greater than approximately 0.5 do not benefit significantly from heat exchanger NTU values greater than 3 due to the diminishing benefits of heat recovery with larger conduction losses.

Simulating Energy-Saving Industry-Grade Installations Involving Thermochemical Heat Recovery

2017 ◽  
pp. 15-22
Author(s):  
Andrey B. Garyaev ◽  
◽  
Vasiliy S. Glazov ◽  
Sergey V. Zhubrin ◽  
Stanislav K. Popov ◽  
...  
Keyword(s):  
Energy Saving ◽  
Heat Recovery ◽  
Thermochemical Heat Recovery

Dynamic model of the external heat engine of the spacecraft power system

2019 ◽  
Author(s):  
V. A. Zenkin ◽  
A. N. Valiullin ◽  
A. V. Bobylev
Keyword(s):  
Power System ◽  
Dynamic Model ◽  
Heat Engine ◽  
External Heat
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