Hydrogen and oxygen recirculation control system for an electric power plant based on an electrochemical generator

Развитие водородной энергетики ведет к увеличению использования электрохимических генераторов (ЭХГ) в морских транспортных средствах в качестве вспомогательных и основных энергоустановок. Топливом для таких энергетических установок являются водород и кислород. Важной для таких энергетических установок является экологическая составляющая При прямом преобразовании химической энергии топлива в электрическую в топливных элементах, побочным продуктом реакции является только вода. В статье рассматривается система управления рециркуляцией рабочих газов - водорода и кислорода в электрохимическом генераторе. Система управления состоит из двух независимых субблоков - контура рециркуляции водорода и контура рециркуляции кислорода. Каждый субблок, работающий по своему алгоритму, построен на программируемом логическом контроллере и управляемой арматуре. В статье также приведены режимы работы системы управления рециркуляцией газов. The development of hydrogen energy increases electrochemical generators (ECG) using in marine vehicles as an auxiliary and main power plants. The fuel for such power plants are hydrogen and oxygen. The environmental component is important for such power plants. When the chemical energy of a fuel is directly converted into electrical energy in fuel cells, there are only water is a by-product of the reaction. The article discusses the control system of the working gases recirculation - hydrogen and oxygen in an electrochemical generator. The control system consists of two independent subunits - a hydrogen recirculation loop and an oxygen recirculation loop. Each subunit is built on a programmable logic controller and controlled armature, working according to its own algorithm. The article also describes the operating modes of the gas recirculation control system.

Optimization and Performance Evaluation of Pilot-scale Electrochemical H2O2 Generator according to Spacer Structure Changes and Catholyte Concentration Condition

Objectives:In this study, We developed pilot-scale bipolar-electrochemical generator (or bipolar-electrolyzer) for generating hydrogen peroxide (H2O2). By comparing H2O2 concentration and generation efficiency of H2O2 according to structure and arrangement of anode/cathode spacer, the structure and arrangement of spacer have been optimised for high H₂O₂ concentration and generation efficiency. Methods:The concentration and generation efficiency of H2O2 were evaluated by changing the width of the channel supporter in anode/cathode spacer and we optimised the arrangement of anode/cathode spacer in electrochemical generator. Additionally, we also evaluated the efficiency of H₂O₂ generation with different concentration catholyte (Na₂SO₄).Results and Discussion:The electrochemical H₂O₂ generator applied anode/cathode supporter with narrow channel supporter showed high H₂O₂ concentration of 2023.83 mg/L. Electrochemical H₂O₂ generator with N-C type spacer (anode: no channel supporter, cathode: channel supporter) showed the highest H₂O₂ concentration (2295.95 mg/L) and H₂O₂ generation efficiency (86.87%). also, we observed that the electrolyzer with 20 PSU has higher H₂O₂ concentration (4217.74 mg/L) and generation efficiency (74.80%).Conclusions:As a results, We generated H₂O₂ with high concentration and high generation efficiency by optimising structure and arrangement of spacer in electrochemical H₂O₂ generator. Also, We concluded that the developed bioplar-electrochemical generator in our study could be applied to the real industry.

Electrical and Heat Power Production Using the Products of Air Conversion of Motor Diesel Fuel and Electrochemical Generator for Agricultural Consumers

At present, the production of electricity for agricultural consumers remote from the centralized electrical power grid is carried out using diesel-generator technology with a limited service life of engines and extremely low efficiency of the expensive fuel used. In this chapter, an innovative technology has been considered for the combined electrical and heat power production using the preliminary conversion of diesel fuel into synthesis gas with its subsequent supply to a high temperature electrochemical generator (ECG). Synthesis gas for the operation of the electrochemical generator was produced by air conversion of motor diesel fuels in a catalytic burner reactor. On the basis of heat balances of the burner, ECG and waste-heat boiler-utilizer, electrical efficiency of the solid oxide fuel cells' (SOFC) battery, chemical efficiency of the burner, the temperature at the SOFC anode, the EMF of the planar cell, a portion of hydrogen oxidized at the SOFC anode, specific consumption of diesel fuel for the production of electrical and heat power were calculated.

Nanostructured Carbon Electrodes for Increased Power Density in Flow Thermo-Electrochemical Generator Heat Sinks

Heat is a by-product of all energy conversion mechanisms. Efforts to utilize and dissipate heat remain a challenge for further development and optimization of energy conversion devices. Stationary thermo-electrochemical cell is a low cost method to harvest heat; however, it suffers from low power density. Flow thermo-electrochemical cell (fTEC) heat sink presents itself as a unique solution as it can simultaneously scavenge and remove heat to maintain devices in the operating range. In this work, multiwalled nanotube (MWNT) electrodes have been used and electrode configuration has been changed to maximize the temperature difference over a small interelectrode separation. As a result, power per unit area of fTEC heat sink has been improved by more than seven-fold to 0.36 W/m2.