Investigation of the Combustion Process of Solid Fuel in Furnaces with Direct-Flow Burners

Volkov, E. P.; Prokhorov, V. B.; Chernov, S. L.; Kirichkov, V. S.; Kaverin, A. A.

doi:10.1134/s0040601520060117

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…The main steam parameters in the boiler header pipes are given in Table 6. Taldinsky coal was chosen as fuel, and its parameters are described in Table 7 [44]. The power unit electric net efficiency was calculated with the standard method, including corrections for the internal power consumption in compressors and the HCC according to Equation (2):…”

Section: Analysis Methods For the Hybrid Steam Power Unit With A Cool...mentioning

confidence: 99%

Research and Development of Hybrid Power Units Heat Flow Diagrams with Cooled High-Temperature Steam Turbines

et al. 2022

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Fossil fuel thermal power plants account for almost 60% of Russian electricity and heat. Steam turbine units make almost 80% of this amount. The main method for steam turbine unit efficiency improvement is the increase in the initial steam parameters’ temperature and pressure. This reduces fossil fuel consumption and harmful emissions but requires the application of heat-resistant steel. The improvement in steel’s heat resistance leads to a non-linear price increase, and the larger the temperature increase, the more the steel costs. One of the methods of improving efficiency without a significant increase in the capital cost of equipment is an external combustion chamber. These allow an increase in the steam temperature outside the boiler without the need to use heat-resistant alloys for boiler superheaters and steam pipelines between the boiler and the steam turbine. The most promising is hydrogen–oxygen combustion chambers, which produce steam with high purity and parameters. To reduce the cost of high-temperature steam turbines, it is possible to use a cooling system with the supply of a steam coolant to the most thermally stressed elements. According to the calculations, the efficiency reduction of a power unit due to the turbine cooling is 0.6–1.27%. The steam superheating up to 720 °C in external combustion chambers instead of a boiler unit improves the unit efficiency by 0.27%. At the initial steam temperatures of 800 °C, 850 °C, and 900 °C, the unit efficiency reduction caused by cooling is 4.09–5.68%, 7.47–9.73%, and 8.28–10.04%, respectively.

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Section: Analysis Methods For the Hybrid Steam Power Unit With A Cool...mentioning

confidence: 99%

Research and Development of Hybrid Power Units Heat Flow Diagrams with Cooled High-Temperature Steam Turbines

et al. 2022

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“…Котел имеет П-образную компоновку. Ширина топочной камеры 7808 мм, глубина 7424 мм, объем 1102 м 3 . Диаметр экранных труб составляет 60 мм, шаг труб 64 мм, потолочная часть образована трубами радиационного пароперегревателя.…”

Section: объект исследованияunclassified

“…В индивидуальном рассмотрении физические явления, такие как течение газа с наличием твердой фазы, турбулентность, химические реакции и теплопередача, сложно поддаются прогнозам и анализу. Этот анализ является еще более сложным, когда данные явления взаимосвязаны в крупномасштабных системах [1,3].…”

Section: Introductionunclassified

Mathematical simulation of furnace processes during fired pulverized coal

Gil

Maltsev

Заворин

et al. 2022

TSU Herald. Phys Math Model. Oil, Gas, Energy

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The article presents the study of combustion and heat transfer processes in large-scale objects are extremely difficult both analytically and experimentally. The combustion of non-design coals in boiler units is often accompanied by a decrease in the completeness of fuel burnup, undesirable redistribution of heat flows and other negative factors due to different thermal characteristics of the fuel. The possibility of effective burnout of polyfractional non-design solid fuel in the combustion chamber of a boiler unit with solid ash removal is considered on the basis of a numerical study of jointly occurring aerothermochemical processes. The problem of numerical modeling of the staged burnout of coal particles is solved, starting from the evaporation of the moisture contained in them to the burning out of their coke residue when moving in the carrier phase. Numerical studies of physical and chemical processes in the combustion chamber were carried out for three loads (50%, 70%, 100%) based on the developed FIRE 3D calculation complex. The Euler-Lagrange model for a dusty flow is applied, the closure of the averaged Navier-Stokes equations is performed by the k-ε turbulence model, the second order of accuracy is used in numerical calculations. The main results of three-dimensional modeling are presented in the form of velocity and temperature fields, the distribution of O2 and CO concentrations along the height of the furnace volume. The results of mathematical modeling showed good agreement with the available analytical values. Based on the data obtained, it can be stated that it is possible to organize the combustion of non-design fuel in the boiler unit under consideration. It has been established that when operating at loads below the nominal, a redistribution of burner jets is observed, which negatively affects the reliability and efficiency of the boiler. To increase the efficiency of the boiler unit at reduced loads, a wider study of options for redistributing the proportions of the fuel-air mixture and secondary air is necessary.

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