Experience of Development, Implementation and Modernization of Hot Water Supply Boilers With Dual-Screens and the Slot Bottom Burners

Energ. Tech. & Res. Sav.

et al. 2021

Self Cite

The possibility of modernization of boilers TVH-8M, TVH-8 and NYYSTU-5, operated in Ukraine, with the increasing of their technical and economic indicators to the modern European level is shown. Projects of modernization of boilers have been developed, which consist in redesign of heating surfaces in convective shafts of existing boilers without increasing their overall dimensions with using convective part of pipes diameter 32 x 3 mm and replacement of burner devices by developed new type MPIG-3. It is shown that the results of industrial implementations achieved efficiency of boilers type TVH-8M (TVH-8) 94-96% in the operating range of their load and obtained the calculated efficiency for boilers NYYSTU-5 92-94%. It is experimentally proven that when installing special calibrated nozzle, instead of drilled holes in the collectors of gas burners, it is possible to keep the nozzle geometry (natural gas burner consumption depending on pressure) unchanged throughout the service life. The technical possibility of combustion of biogas and mixtures of natural gas and hydrogen in the slot bottom diffusion burners of the MPIG-3 type, when replacing only the nozzle apparatus is shown. Bibl. 17, Fig. 6, Table 1.

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Energy Efficient Equipment for Modernization of the Gas Boilers Power 0.1-30 Mw

Sigal

Lavrentsov

Energ. Tech. & Res. Sav.

et al. 2021

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Features of Combustion of Hydrogen and Its Mixtures With Methane (Or Natural Gas) in Boilers and Furnaces

Marchenko

2023

Inter J Ener Clean Env

In the work the possibility and principles of partial or complete replacement of natural gas as a fuel with hydrogen and its mixtures with methane (or natural gas) in new and existing boilers and furnaces with a capacity of approximately 0.3-60 MWare determined. The performed calculation showed the possibility of using one diffusion burner on natural gas, hydrogen, or their mixture in any proportion and the thermal power of the burner on methane (or natural gas) and hydrogen or their mixture at the same gas pressure is close. The use of condensing boilers is preferable due to the greater amount of thermal energy (as a percentage of heat output in firebox) that is obtained by condensing water vapor from flue gases when burning hydrogen compared to burning methane (or natural gas) is showed. Some constructions of burners and boilers for burning hydrogen and its mixtures with methane (or natural gas) are proposed. The difference in specific losses during hydrogen transportation by gas pipelines for methane (or natural gas) are determined; when pure hydrogen was supplied into gas pipelines for natural gas, its leakage per unit time (m<sup>3</sup>/s) will be near 2.8 times higher, but the amount of energy lost will be less by approximately 9.2%.

Experimental Research of Mixing Natural Gas Impinging Jets and Air During Combustion at a Vertical Refractory Surface

Energ. Tech. & Res. Sav.

Sigal

Marasin

et al. 2023

Self Cite

In the work determined the conditions for the start of chemical reactions of natural gas and air mixture at combustion on a refractory surface, when a single submerged turbulent impinging jet is fed from a natural gas collector at the angle α to the vertical refractory surface, at the relative distance L/d0 along the geometric axis of the jet. It is determined that combustion starts under the condition when the excess air coefficient in the mixture reaches about λ = 0.93, at which the laminar flame propagation velocity S°L, m/s, for a premixed mixture of methane and air is maximum. The dependence of the height of the flame Lf, m, on the relative dimensionless step of the location of the nozzles s/d0 in the row was obtained during studying the groups of gas nozzles with the supply of natural gas for combustion through them range diameters 1–3.5 mm (which are used at precent time in the construction of slot bottom burners). It was determined that the flame height of slot bottom burner during its operation on natural gas (tested for the pressure of natural gas in the collector from 2 kPa to 18 kPa, respectively, natural gas outflow velocity, WNG from about 60 m/s to 185 m/s) depends slightly on gas pressure, the relative distance L/d0 that the aerated jet of natural gas travels to the refractory surface in the range of 15 ≤ L/d0 ≤ 30 and the Reynolds number, and strongly depends from on the dimensionless step of the nozzles in the row — s/d0. It has been experimentally proven that by adjusting the dimensionless step of the nozzles (holes) s/d0 in the row of the slot bottom burner, it is possible to adjust the height of the flame and thus obtain the flame of the appropriate height for different heights of fireboxes and boilers powers. Bibl. 29, Fig. 3, Tab. 3.