Adaptation of the high-pressure electrolyzer in the conditions of joint operation with TPP and NPP power-generating units

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Authors:


A.A.Shevchenko, orcid.org/0000-0002-6009-2387, A.M.Pidhorny Institute of Mechanical Engineering Problems of NASU, Kharkiv, Ukraine. e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

M.M.Zipunnikov, orcid.org/0000-0002-0579-2962, A.M.Pidhorny Institute of Mechanical Engineering Problems of NASU, Kharkiv, Ukraine. e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A.L.Kotenko, orcid.org/0000-0003-2715-634X, A.M.Pidhorny Institute of Mechanical Engineering Problems of NASU, Kharkiv, Ukraine. e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (6): 076 - 082

https://doi.org/10.33271/nvngu/2020-6/076



Abstract:



Purpose.
To substantiate the need to adapt the high pressure electrolyzer (HPE) to the conditions of joint operation with TPP and NPP power generating units to solve the problem of operating power generating units in the basic mode and to ensure the use of excess electrical power produced during periods of its minimal consumption for generating hydrogen and oxygen with their subsequent use during the electrical power peak consumption. This will allow reducing the number of start stop modes caused by unevenness of the of electrical consumption schedule.


Methodology.
Studying of electrochemical process of hydrogen and oxygen generation for their subsequent use in the technological schemes of TPP and NPP power generating units is based on the laws of mass conservation, thermodynamics, electrical engineering and electrochemistry when applying the data obtained from simulation and physical modeling methods.


Findings.
We have studied the peculiarities of the use of hydrogen as a fuel under electrical energy production. The product of hydrogen combustion in oxygen is superheated water vapor the working substance of modern steam turbines. The steam can be sent to a steam turbine where it performs an operation expanding. There were analyzed prospects of joint operating the power generating units with a high-pressure electrolyzer under the basic mode when the excess electricity produced in the minimal consumption periods was used for generating hydrogen and oxygen. Ways for modernization of the existing steam turbine installations were offered for work on variable modes (including the peak electrical energy consumption). Technological schemes of TPP and NPP power generating units have been improved and thermodynamic parameters of the cycles have been increased.


Originality.
The calculated data show that when a steam turbine cycle is carried out with hydrogen superheated steam at 101, the thermodynamic efficiency of the hydrogen fuel use can be 1.52 times higher than efficiency of the natural gas use in gas turbines, and the coefficient of electrical power regeneration can be from 40 to 50%.


Practical value.
A scheme for arranging the block of four electrolysis cells modules and a schematic diagrams of the basic types of hydrogen-oxygen steam generators have been developed; a set of works was completed aimed at developing scientific and technical principles for creating the new highly economic power generating units of increased maneuverability.


Keywords:
electrolyzer, hydrogen, oxygen, steam generator, steam-gas turbine

References.


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