The world community is worried about the effects of global warming. A few agreements on reduction CO2 emissions have been signed recently. large part these produced by power production industry. Soon, requirements for thermal plant ecology and efficiency performance may become significantly higher. Thus, contemporary problem development highly efficient facilities with low toxic greenhouse gas emission. An way to reduce into atmosphere, which implies maintaining economic growth, creation...

This study investigates the combustion processes of methane in an oxygen and carbon dioxide environment within oxygen-fuel energy complexes (OFC). The unique operating conditions, characterized by high pressures (up to 300 atm) use CO2 as a diluent, necessitate thorough understanding dynamics, which differ significantly from traditional gas turbine units (GTU). An experimental setup, inspired existing literature, is proposed evaluate characteristics under these conditions. Key objectives...

Improvement of energy efficiency in technological processes at industrial enterprises is one the key areas saving. Reduction costs required for production energy-intensive products can be achieved through utilization waste heat produced by high-temperature thermal furnace units. Generation electric power based on using cycles with working fluids that are not conventional large engineering, may become a promising saving trend. In this paper, thermodynamic analysis and optimization purposes...

The paper is concerned with the thermodynamic analysis of a multi-stream heat exchanger system for Allam cycle and development regenerator flow chart. procedure are described in detail. constructed five double-flow exchangers has 2.5% lower power than ideal exchanging system. Besides, subsequent interaction principle transfer maximal amount proposed: it necessary to begin cooling heating flows minimal temperatures.

This paper presents the results of study on determination degree and nature influence operating conditions burner units flare geometric parameters heat transfer in a combustion chamber fire-tube boilers. Change values outlet gas temperature, radiant convective specific flow rate with appropriate modification an expansion angle length was determined using Ansys CFX software package. Difference between total bulk temperature gases at flue tube calculated known methods for thermal calculation...

Numerical simulation of temperature field cooled turbine blades is a required element gas engine design process. The verification usually performed on the basis results test full-size blade prototype gas-dynamic bench. A method calorimetric measurement in molten metal thermostat for thermal model proposed this paper. allows obtaining local values heat flux each point surface within single experiment. error determination transfer coefficients using does not exceed 8% with radial channels. An...

Large enterprises of power engineering (PJSC Power Machines, JSC ROTEK, etc.) often have a large amount experimental data that is used as verification basis for the results numerical simulation. In this case, task arises storing received and its use training employees. Small companies do not full experience sufficient to select optimal settings, which can lead high accuracy modeling. The solution create database containing recommendations choosing settings grid solver module modeling...

This study aims to present the results of thermodynamic analysis and optimization E-MATIANT cycle. The design parameters cycle are set up on basis component technologies today's state-of-the-art gas turbines with a turbine inlet temperature between 1100°C 1700°C. optimal pressure ratio ranges for considered temperatures identified comparison existing evaluations is made. For initial net efficiency varies from 42.0 49.8% without considering cooling. An influence additional reheat in combustor...

The compatibility of the semiempirical turbulence theory L. Prandtl with actual flow pattern in a turbulent boundary layer is considered this article, and, based on theory, final calculation results are analyzed.These show that accepted additional conditions and relationships, which integrate differential equation Prandtl, associating stresses transverse velocity gradient, fulfilled only near-wall region, where mentioned loses meaning, inconsistent physical meaning main part integration.It...

Currently, software products for numerical simulation of fluid dynamics processes (Ansys, Star CCM+, Comsol) are widely used in the power engineering industry when designing new equipment. However, computer methods embedded proprietary make specialists choose grid settings, boundary conditions, and a solver providing minimal deviation from experimental data with maximal calculation speed. This paper analyzes influence main settings conditions Ansys package on error flows standard elements...

This study aims to present the results of thermodynamic analysis and optimization E-MATIANT cycle. The design parameters cycle are set up on basis component technologies today's state-of-the-art gas turbines with a turbine inlet temperature between 1100°C 1700°C. optimal pressure ratio ranges for considered temperatures identified comparison existing evaluations is made. For initial net efficiency varies from 42.0 49.8% without considering cooling. An influence additional reheat in combustor...

The efficiency of the oxy-fuel combustion power cycles significantly depends on gas turbine cooling losses. high density and low viscosity supercritical carbon dioxide determine significant coolant mass flow in channels. Increasing firing temperature turbines requires growth system effectiveness. This investigation focus development heat transfer enhancement method for blade trailing edge a turbine. A numerical study was conducted to investigate friction performance rectangular channels with...

Currently, about a thousand micro gas turbine units of small and medium capacity are in operation the Russian Federation, which used as an autonomous power source at critical infrastructure facilities. During long-term operation, component parts GTU may fail require replacement or repair. The lack spare design documentation for their production makes it impossible to operate. As way solve problem, reverse engineering process can be produce components. One stages is determine geometric...

Fossil fuel thermal power plants account for almost 60% of Russian electricity and heat. Steam turbine units make 80% this amount. The main method steam unit efficiency improvement is the increase in initial parameters’ temperature pressure. This reduces fossil consumption harmful emissions but requires application heat-resistant steel. steel’s heat resistance leads to a non-linear price increase, larger more steel costs. One methods improving without significant capital cost equipment an...

The co-generation facilities have maximal thermal efficiency. In the case of Russian Federation, for power production industry, development combined cycle (CCGT-CHP) is especially urgent. CCGT-CHP daily load schedule requires demand both electricity and heat, heat depends only upon ambient air temperature. gas turbine reduction subsequent steam during electric drop down are limited by necessity to maintain flow district water heater supply power. Methane reforming allows recovery excess in...

Loop and semi-loop cooling schemes are widely used for the high-temperature gas turbine blades. In such schemes, mid-chord airfoil parts traditionally cooled by radial channels with ribbed walls. The blades a small specific span, or “short” blades, have different heat flux amounts on pressure suction sides, which results in temperature difference these sides of 100–150 °K. This causes thermal stresses reduces long-term strength margins. paper presents new method transfer intensification...

Transition to oxy-fuel combustion power cycles with zero harmful emissions is a prospective direction of the industry development. The so-called Allam cycle widely known. Its key element multi-flow regenerative heat exchanger that operates at high temperatures and pressure drops. amount utilized in this remarkably influences production efficiency. Based on thermodynamic analysis we propose scheme five two-flow plate type exchangers. Installation square section exchanging channels 45°...

Studying closed gas turbine cycles on supercritical carbon dioxide is currently a promising issue in the development of power energy sector terms increasing efficiency and minimizing greenhouse emissions into atmosphere. Combustion methane with oxygen combustion chamber occurs not nitrogen environment, but environment dioxide, that working fluid cycle, which an inhibitor chemical reactions. A large mass content such diluent reaction mixture volume leads to risks significant underburning,...

Abstract Coal-fired steam turbine thermal power plants produce a large part of electricity. These usually have low efficiency and high carbon dioxide emission. An application combined cycle with coal gasification equipped capture storage systems may increase the decrease harmful This paper describes investigation oxidizer type in integrated combustion chamber its influence upon energy environmental performance. The oxy-fuel technology allow losses 58% smaller than traditional air one. IGCC...