gas fuel
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Author(s):  
Fikret Polat ◽  
Murat Kadir Yeşilyurt ◽  
Ümit Ağbulut ◽  
Mustafa Karagöz ◽  
Suat Sarıdemir

2021 ◽  
Vol 12 ◽  
pp. 65-69
Author(s):  
Van Thinh Dinh

Hydrogen is considered as "the green fuel of the 21st century" and forecasted to play a leading role in the energy transition. The article introduces the processes of green hydrogen production in Energiepark Mainz, the first wind power hydrogen production plant with a capacity of 6 MW in Germany. The article describes the production, storage, transportation, and consumption (gas, fuel for bus and industries) of green hydrogen through the continuous operation of the plant. Based on that, the author analyses opportunities and challenges when applying Energiepark Mainz's model to the green hydrogen production strategy in Vietnam.


Author(s):  
Q G Zheng ◽  
W Q Wu ◽  
M Song

The engine fuel piping in LNG-fuelled ships’ engine room presents potential gas explosion risks due to possible gas fuel leakage and dispersion. A 3D CFD model with chemical reaction was described, validated and then used to simulate the possible gas dispersion and the consequent explosions in an engine room with regulations commanded ventilations. The results show that, with the given minor leaking of a fuel pipe, no more than 1kg of methane would accumulate in the engine room. The flammable gas clouds only exit in limited region and could lead to explosions with an overpressure about 12 mbar, presenting no injury risk to personnel. With the given major leaking, large region in the engine room would be filled with flammable gas cloud within tens of seconds. The gas cloud might lead to an explosion pressure of about 1 bar or higher, which might result in serious casualties in the engine room.


2021 ◽  
Vol 11 (24) ◽  
pp. 11832
Author(s):  
Ji-Eon Kim ◽  
Pyung-Su Kim ◽  
Jong-Myoung Lee ◽  
Han-Seop Choe ◽  
Jong-Do Kim

While producing gas fuel supply pipes for duel fuel (DF) engines, a welding process is essential. Accordingly, specimen management before and after welding is crucial to obtain highly reliable weldments. In this study, we developed an environmentally friendly laser cleaning technology to address a toxic work environment and environmental pollution problems caused by chemical cleaning technology utilized in post-welding treatment of gas fuel supply for DF engines. An experiment was conducted by implementing surface laser cleaning of the butt and fillet weldment specimens according to process parameters. Conditions of process parameters were identified for facilitating laser cleaning and used in prototype production. The prototypes were processed through laser and chemical cleaning, and the quality of the end products was compared. The results indicated that the proposed method satisfactorily cleans the prototype surface without generating a toxic work environment and environmental pollution problems. Moreover, the roughness of approximately 5 μm was achieved on the laser cleaned surface. This is considered to be able to increase the adhesion of the paint compared to the smooth chemical cleaned surface during the painting for anticorrosion of the product.


2021 ◽  
pp. 105733
Author(s):  
Nathaly M. Rivera ◽  
Scott Loveridge

Membranes ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 938
Author(s):  
Aleksandra Janusz-Cygan ◽  
Jolanta Jaschik ◽  
Marek Tańczyk

The agriculture sector in Poland could provide 7.8 billion m3 of biogas per year, but this potential would be from dispersed plants of a low capacity. In the current study, a membrane process was investigated for the upgrading biogas to biomethane that conforms to the requirements for grid gas in Poland. It was assumed that such a process is based on membranes made from modified polysulfone or polyimide, available in the market in Air Products PRISM PA1020 and UBE UMS-A5 modules, respectively. The case study has served an agricultural biogas plant in southern Poland, which provides the stream of 5 m3 (STP) h−1 of biogas with a composition of CH4 (52 vol.%), CO2 (46.3 vol.%), N2 (1.6 vol.%) and O2 (0.1 vol.%), after a pretreatment. It was theoretically shown that this is possible to obtain the biomethane stream of at least 96 vol.% of CH4 purity, with the concentration of the other biogas components below their respective thresholds, as required in Poland for gas fuel “E”, with methane recovery of up to 87.5% and 71.6% for polyimide and polysulfone membranes, respectively. The energetic efficiency of the separation process is comparable for both membrane materials, as expressed by power excess index, which reaches up to 51.3 kWth kWel−1 (polyimide) and 40.7 kWth kWel−1 (polysulfone). In turn, the membrane productivity was significantly higher in the case of the polyimide membrane (up to 38.3 kWth m−2) than those based on the polysulfone one (up to 3.13 kWth m−2).


2021 ◽  
Vol 22 (6) ◽  
pp. 1619-1631
Author(s):  
Zhiyu Han ◽  
Zhenkuo Wu ◽  
Yongcheng Huang ◽  
Yongsheng Shi ◽  
Wei Liu

2021 ◽  
Vol 2096 (1) ◽  
pp. 012103
Author(s):  
N A Ermoshin ◽  
S A Romanchikov ◽  
V O Bayrak ◽  
Yu Yu Kashtanov

Abstract A technology is proposed to improve the efficiency of heat devices operating on gas fuel. The technology is based on the use of a method of burning depleted ionized gas fuel in an electric field. Application of the method allows to reduce the formation of soot deposits and provides a more complete combustion of the gas. Increasing the efficiency of heating devices is achieved due to the formation of an electric field by including an ionizing radiation device in the structure of the gas stove. The energy of the ionizing radiation of the gas fuel provides the formation of Coulomb forces. Combustion intensifies, and convective heat exchange increases due to electroconvection. The design of the ionizing radiation device includes electrodes located at a distance from each other. Power is supplied from a voltage source. The electrodes are fixed using porcelain ring insulators. The proposed design solutions provide not only a decrease in gas fuel consumption, but also an increase in the flame temperature and the power of thermal radiation not only in the visible, infrared and ultraviolet ranges. Additional electrolysis of the fuel mixture, and the acceleration of its combustion rate is achieved due to ionization. The results of experimental studies to determine the parameters of the combustion processes of gas fuel (isobutane (CH3-CH(CH3)-CH3) – 72 %, butane (CH3-CH2– CH2-CH3) – 22 %, propane (C3H8) – 6 %) are presented. It was found that with a variable electric field strength for gas ionization, an increase in the temperature of the frying bed by 39%, heat transfer by 2 times, a decrease in carbon oxides by 31–36%, and a decrease in gas fuel consumption by 26% are achieved.


2021 ◽  
Vol 922 (1) ◽  
pp. 012073
Author(s):  
Syafriandi ◽  
F Fachruddin ◽  
A Lubis ◽  
H Maulina ◽  
P Nazura

Abstract The roasting process is the process of frying something without using oil. The roasting processes raw materials into cooked or ready-to-eat ingredients. The purpose of the roasting is to get a certain taste using heat transfer methods either without media or using sand. When the roasting process occurs, the coffee beans undergo physical changes, one of which is the water content due to heat transfer from the roasting medium to the material. During the roasting process, evaporation of water content occurs and the coffee beans will experience a decrease in mass. Coffee bean roasting machines with stove heat sources from gas fuel are currently being developed. The use of gas fuel is sometimes difficult to regulate a constant temperature because it depends on the valve setting to exit the gas flow on the stove. On the other hand if incomplete combustion occurs it will affect the flavour of the roasted coffee beans. The purpose of this study was to test a coffee roasting machine with an electric element heat source. Roasting machine testing with a time of 50 minutes produces an average temperature of 196.64 °C with a final moisture content of 3.61%.


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