Assessment of Operational Performance for an Integrated ‘Power to Synthetic Natural Gas’ System

This article presents a power to SNG (synthetic natural gas) system that converts hydrogen into SNG via a methanation process. In our analysis, detailed models for all the elements of the system are built. We assume a direct connection between a wind farm and a hydrogen generator. For the purposes of our calculations, we also assume that the hydrogen generator is powered by the renewable source over a nine-hour period per day (between 21:00 and 06:00), and this corresponds to the off-peak period in energy demand. In addition, a hydrogen tank was introduced to maximize the operating time of the methanation reactor. The cooperation between the main components of the system were simulated using Matlab software. The primary aim of this paper is to assess the influence of various parameters on the operation of the proposed system, and to optimize its yearly operation via a consideration of the most important constraints. The analyses also examine different nominal power values of renewables from 8 to 12 MW and hydrogen generators from 3 to 6 MW. Implementing the proposed configuration, taking into account the direct connection of the hydrogen generator and the methanation reactor, showed that it had a positive effect on the dynamics and the operating times of the individual subsystems within the tested configuration.

MOLECULAR HYDROGEN GENERATOR GVCH LIFE

Molecular hydrogen is one of the effective antioxidants, which not only does not disrupt normal metabolism in the body, but also activates its antioxidant systems. Hydrogen-saturated water has antioxidant, anti-inflammatory, anti-allergic, anti-apoptotic properties, stimulates energy metabolism and contributes to the systemic recovery of the body. It is used as a therapeutic factor for the treatment of patients with various pathologies: arterial hypertension, coronary heart disease, diabetes, obesity, metabolic disorders, disorders of the musculoskeletal system. The article discusses the various methods of obtaining molecular hydrogen and hydrogen water (direct and indirect saturation). Technical characteristics are described and features of the hydrogen generator GVCh Life (manufacturer LTD «Chemtest Ukraine+», Kharkiv, Ukraine), which produces molecular hydrogen (purity of which is 99.99 %, productivity — 100 ml/min) and saturates water with it (https://chemtest.com.ua/generator_vodorodnoy_vodi_i_dihanie_gvch_life). In contrast to the problems of most known generators in the device GVChLife is completely no contact of the electrodes with water, so it is not subject to electrolysis and is not saturated with metal ions. Water saturated in this way has the following characteristics: redox potential 560 mV, hydrogen concentration 1.0–1.15 ppm(water volume 1 l, saturation duration 10 min). The generator can be used for both hydrogen saturation and hydrogen inhalation. In the case of therapeutic use of hydrogen water to obtain it, you can use any drinking water (spring, prepared or non-carbonated bottled), hydrogen inhalation using nasal cannulas. Inhalation of pure hydrogen gas (99.99 %) for 30 minutes is equal to the use of 15 liters of hydrogen water (concentration 1.1–1.2 ppm). Conclusions. The developed MoHC Life molecular hydrogen generator is safe to use, without special requirements during operation. It can be successfully used in the complex therapy of patients with various diseases, including musculoskeletal system.

Small Scale Skid-Mounted Natural Gas to Hydrogen Production System Provides Competitive Hydrogen for China

Because of its convenience, high efficiency and low cost, small-scale skid-mounted hydrogen generator has become a hydrogen-production object of intense research efforts worldwide and has broad prospects in application. We analyze the technical points and difficulties in detail of this kind of on-site compact hydrogen generators from natural gas, by each section in the production process. It is suitable for integrated hydrogen refueling stations due to easy transportation and installation. Related applications are introduced by comparing the technical parameters of recent typical products in the world. Meanwhile, we calculate that the full life cycle cost of hydrogen from skid-mounted hydrogen generator from natrual gas can achieve less than 40CNY / kgH2, which is more economic than other possible hydrogen sources and transportation modes of a hydrogen refueling station. Although the advantages mentioned above, we point out that technology innovation is still desirable, especially in the process of reforming, automatic control, system integration and catalysis, to realize the minimization of skid-mounted hydrogen generators base on natural gas, for its further and wider application in the future.

Degradable ultrathin high-performance photocatalytic hydrogen generator from porous electrospun composite fiber membrane with enhanced light absorption ability

Poly(L-lactide) (PLA)/TiO2/Pt composite fiber membrane with internal porous channel structure is fabricated by skillfully tuning the breath figure mechanism and vapor induced phase separation mechanism with solute and solvent matching...

A Variant of a Regenerative Hydrogen Storage and Production System for Power Installations

The aim of this work is to obtain cheap and environmentally friendly fuels for automobile transport, as well as reducing emissions of harmful substances into the atmosphere with car exhaust. The problem can be solved by creating a system for producing technical hydrogen and its use in internal combustion engines and other power units. This article proposed using active metals, their alloys, or metal hydrides interaction with water to generate hydrogen. This proposal is based on an analysis of existing and possible methods of storing and transporting hydrogen. For the practical realization of this approach has been proposed the construction of the device of hydrogen storing and generating for powerful engines and vehicles. The functioning of the recommended equipment is to hydrogen generation by reacting the active metals, or their alloys, or metal hydrides with water in a polar aprotic organic solvent. From these products, it has been proposed to form the cartridges with internal through holes—cartridges placed in the hydrogen generator. The polar solvent pumped through the hydrogen generator in which it reacts with the material of the cartridge. At this solvent is added the water in a controlled manner and used for the reaction with the cartridge material for hydrogen release. Hydrogen, after separation of the liquid phase, flows into the fuel system of the internal combustion engine. The spent solvent is pumped into the solvent intake and storage system and, subsequently, the solvent is replaced when the cartridge is replaced. The system can operate in a closed-loop in the case organization of gathering and recycling of waste materials for reuse.