Complex analysis of planning the power station equipment repair in generating companies

The problem of planning the thermal power station equipment repair in conditions of transition to adjustable markets of energy has been analyzed. The bases of applying the system approach in conditions of real restrictions by financial resources are stated. The method based on classification of sources of repair work initiation and considering priorities of works for different control levels is offered as a scheduling algorithm

Numerical study of aerodynamics in dead-end furnace with reverse flame

The authors have modeled turbulent combustion of natural gas in the reverse flame of fire-tube boiler using the ANSYS Fluent 12.1.4. The complete geometric model of the dead-end furnace based on boiler drawings was considered. Finite element model was used for the following processes and phenomena: the combustion of methane in air oxygen, radiant and convective heat transfer, turbulence. Aerodynamic structure and volumetric pressure fields of the flame were calculated for different degrees of spin-fuel jet. The effect of the twist parameter on a drag coefficient of dead-end furnace was estimated. The authors calculated critical twist parameter values when the disruption of the flow and reversal currents zone in the axial region occurs. The results are presented in graphical form

Prospects of using low-grade fuels of Tomsk region for thermal technology use

The relevance of the work is conditioned by the necessity of including renewable energy sources, in particular biomass, into fuel and energy balance. The aim of the paper is the experimental testing of heat technologies in producing fuel briquettes in various types of low-grade fuels of Tomsk region. Using the physical experiment method the authors tested the largest manifestation of low-grade fuels of Tomsk region for suitability of their processing into fuel briquettes. Thermotechnical characteristics of low-grade fuels of Tomsk region, the material balances of their thermal technological processing, the results of forming fuel briquettes were determined through the research. Thermotechnical and strength characteristics of the briquettes allow making the following conclusions: the developed thermal technology should be used for processing wood chips and Kandinsky peat; processing of brown coal of Talovsky deposit and peat of Sukhoi deposit is possible at detailed feasibility study; Karasevsky sapropel and Arkadevsky peat as source raw material for thermal technology are least suitable because of very high ash value of the produced fuel briquettes

Aerodynamic tests of a burner

The paper introduces the structural scheme of the considered burner device. The authors have carried out the aerodynamic tests of the burner device with carbonaceous structure of active zone granular filling for estimating the possibility of its application when using liquid and gaseous fuels as energy carriers. The measurement procedure and the experimental stand description are introduced. The table and the schedules introduce the assessment results of aerodynamic resistance on a torch bulk layer path being in different ranges of given air speeds at various quantity of cylinder open perforation. On the basis of the obtained experimental data the conclusions are drawn on security of a working zone of the burner device active oxidation with desired air flow. Thus, the possibility of carrying out bench thermal tests of the burner device is proved

Numerical investigation of a burner twist parameter effect on thermogas dynamic processes in boilers BKZ74207140

Based on numerical study the authors have analyzed thermogas dynamic processes in BKZ-420-140 combustion chamber at different twist parameters of fuel-air mixture and secondary air. The authors used the Euler-Lagrange aerothermochemistry way to describe processes in gas-dispersed environments; gas turbulent characteristics are calculated using a two-parameter "k-e" turbulence model considering moving particles effect. The paper introduces graphic results in different sections of flames spread across the combustion chamber width showing flame formation structure with dispersed phase, its ignition and combustion. The authors analyzed twist parameter effect on formation of internal and external recirculation zones and their thermal action on twisting torch boundaries. The effective values of the twist parameter for burning high-ash Ekibastuz coals were obtained

Engineering method for thermal calculation of the vortex combustion in dead-end fire-tubes

In article the method for predicting the vortex formation in the dead-end furnace is described. Mass and heat balances of environment in the vortex are calculated using the computer simulation with ANSYS Fluent software. Engineering approach for quantitative analysis of singularities in the reversible flame is proposed. Assessment of vortices integral characteristics, including effects on the aerodynamics and heat transfer processes in dead-end furnace, is given

Engineering method for thermal calculation of the vortex combustion in dead-end fire-tubes

In article the method for predicting the vortex formation in the dead-end furnace is described. Mass and heat balances of environment in the vortex are calculated using the computer simulation with ANSYS Fluent software. Engineering approach for quantitative analysis of singularities in the reversible flame is proposed. Assessment of vortices integral characteristics, including effects on the aerodynamics and heat transfer processes in dead-end furnace, is given

Computer simulation of the fire-tube boiler hydrodynamics

Finite element method was used for simulating the hydrodynamics of fire-tube boiler with the ANSYS Fluent 12.1.4 engineering simulation software. Hydrodynamic structure and volumetric temperature distribution were calculated. The results are presented in graphical form. Complete geometric model of the fire-tube boiler based on boiler drawings was considered. Obtained results are suitable for qualitative analysis of hydrodynamics and singularities identification in fire-tube boiler water shell

Computer simulation of the fire-tube boiler hydrodynamics

Finite element method was used for simulating the hydrodynamics of fire-tube boiler with the ANSYS Fluent 12.1.4 engineering simulation software. Hydrodynamic structure and volumetric temperature distribution were calculated. The results are presented in graphical form. Complete geometric model of the fire-tube boiler based on boiler drawings was considered. Obtained results are suitable for qualitative analysis of hydrodynamics and singularities identification in fire-tube boiler water shell