Effectiveness of steam generation in oxyhydrogen steam generators of the megawatt power class

In the context of emission-free electricity generation, the authors developed a novel hydrogen-oxygen combustor, which is based on swirl-stabilized combustion technology and steam dilution. Following previous burner characterization, the current study investigates the heat transfer conditions in the combustion chamber wall. To this end, a carefully controlled co-flow of air is used to cool the combustion chamber in an annular duct, which surrounds it. Temperature measurements enable the evaluation of the heat flux from the combustor flow to the walls, local wall temperatures, and the Nusselt numbers on the hot and the cold side. The extremely high wall temperatures, caused by the H2/O2 flame, can be reduced by steam dilution down to approximately 900 K. Even better cooling could be reached by using the dilution steam as the coolant before it flows to the plenum. The Nusselt numbers at the inner combustion chamber wall are in the order of 10 − 50 and increase with the thermal power and the steam dilution ratio.

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“…Similar projects have also been carried out in Russia [18][19][20] and Japan [21][22][23] with similar technical challenges.…”

Section: Introductionmentioning

confidence: 93%

Heat transfer measurements in a hydrogen-oxyfuel combustor

Tanneberger

Stathopoulos

2020

Experimental Heat Transfer

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“…Several tasks still need solving in order to move from prototypes to large-scale use of the HOSG. For a more accurate study and completeness of the combustion of hydrogen in oxygen, further experimental studies are necessary [59,60].…”

Section: The Usage Of Hydrogen As a Fuel In Hydrogen-oxygen Steam Gen...mentioning

confidence: 99%

“…In addition, this technical solution will require the replacement of the high-pressure cylinder of the turbine to be able to work on fresh steam with a temperature of 565 • C, estimated at $3.64 million for the T-100-130 turbine; there is no cost data for the CHP-22. It is also necessary to purchase the HOSG unit at a cost of $2.42 million (expert assessment based on [59][60][61][62][63]).…”

Section: Characteristic Chp-21 Chp-22mentioning

confidence: 99%

Analysis of Technologies for Hydrogen Consumption, Transition and Storage at Operating Thermal Power Plants

et al. 2022

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The paper analyses operating and developing technologies for hydrogen implementation, transition, and storage at operating thermal power plants (TPPs) to make recommendations for realization of perspective projects for evaluation of the use of hydrogen as a fuel. Over the medium-term horizon of the next decade, it is suggested that using the technology of burning a mixture of hydrogen and natural gas in gas turbines and gas-and-oil-fired boilers in volume fractions of 20% and 80%, respectively, be implemented at operating gas fired TPPs. We consider the construction of the liquefied hydrogen and natural gas storage warehouses for the required calculated quantities of the gas mixture as a reserve energy fuel for operating the TPPs. We consider the possibility of the reserve liquid fuel system being replaced by the technology involving storage of liquefied hydrogen in combination with natural gas. An economic assessment of the storing cost of reserve fuel on the TPP site is given. The paper suggests that the methane-hydrogen mixture be supplied to the TPP site by two independent gas pipelines for the possibility of using the mixture as the main fuel and to exclude fuel storage at the plant.

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“…9,10 To obtain high-temperature steam, special hydrogenoxygen steam generators can be applied. [11][12][13] However, there are challenges with using combustion products for power generation units due to high temperature of hydrogen-oxygen mixtures obtained by burning. In this case, the obtained combustion products form water vapor "contaminated" by dissociation products, which requires a comprehensive research into composition of combustion products and analysis of hydrogen-oxygen combustion processes in terms of conditions needed for maximum efficiency of hydrogen fuel combustion.…”

Section: Introductionmentioning

confidence: 99%

“…To obtain high‐temperature steam, special hydrogen‐oxygen steam generators can be applied 11–13 . However, there are challenges with using combustion products for power generation units due to high temperature of hydrogen‐oxygen mixtures obtained by burning.…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical study of combustion efficiency of hydrogen‐oxygen mixture at pressure of 0.25 to 6.0 MPa

Aminov

Egorov

2022

Intl J of Energy Research

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The paper presents the new results of experimental and theoretical studies of combustion processes in hydrogen-oxygen mixtures. Considered the impact of pressure in the combustion chamber on the efficiency of hydrogen fuel combustion. Experimental research results showed that the hydrogen content on the exit from the first and second sections of the experimental combustion chamber was 5.674% mass and 0.719% mass, respectively, at the pressure of 1.0 MPa. The proposed pressure range extension is based on computational experiments relating mathematical modeling of the processes occurring in the experimental setup, in particular, for the pressure in the combustion chamber and flame tube ranging from 0.25 to 6.0 MPa. The obtained results were verified. The accuracy in estimating the temperature of combustion products found due to the computational and physical experiments is in the range of 98.89%-102.37% at the outlet of the first section, and is in the range of 97.38%-97.86% at the outlet of the second section. Meanwhile, the accuracy in estimating the hydrogen underburning is in the range of 100.37%-101.53% at the outlet of the first section, and is in the range of 98.81%-99.05% at the outlet from the second section. Computational experiments show that an increase in the combustion products pressure leads to an increase in the combustion products temperature at the exit from the first section was within 1264 C-1713 C range, and on the exit from the second section was within 937 C-1386 C. It is shown that the recombination rate achieved in the experimental setup and computational experiments was 10.718 to 10.814 kg/(kgÁs) at the pressure from 0.25 to 6.0 MPa. In this case, the minimum time necessary to complete recombination of combustion products was 0.5478 to 0.55 s under given conditions of external cooling. The pressure range in the combustion chamber does not significantly affect the mass fraction unreacted hydrogen.

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Effectiveness of steam generation in oxyhydrogen steam generators of the megawatt power class

Cited by 25 publications

References 3 publications

Heat transfer measurements in a hydrogen-oxyfuel combustor

Heat transfer measurements in a hydrogen-oxyfuel combustor

Analysis of Technologies for Hydrogen Consumption, Transition and Storage at Operating Thermal Power Plants

Experimental and theoretical study of combustion efficiency of hydrogen‐oxygen mixture at pressure of 0.25 to 6.0 MPa

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