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Investigation of Fire Protection Certification for Aircraft Engine Components
Issue:
Volume 8, Issue 6, November 2019
Pages:
73-78
Received:
14 October 2019
Accepted:
9 November 2019
Published:
22 November 2019
Abstract: Fire protection performance is one of the most important capabilities for aircraft engine, since the result may be hazardous in the case of a fire condition. According to fire protection regulation CCAR 33.17 of China Civil Aviation Regulations, fire-proof tests of a specific pipeline, a fuel tank and a fuel filter assembly were carried out. Test conditions include inlet fluid temperature, fluid pressure, fluid volume flow, fire temperature and heat flux density. The average flame temperature during the fire tests is 2000 degrees Fahrenheit, the heat flux density is 116kW/m2±10kW/m2 and the distance from burner exhaust to the test area is 100mm in these fire tests. Fire test of pipe passed, but the fire test of oil tank failed because of the failure of the oil circulation system and the melting of plastic pipe material in the ventilation pipe separately. The first fire test of the fuel filter failed because of design defect of one oil drainage path, but after design change of the oil drainage path, the second one succeeded. Based on the fire protection tests and results analysis, three essential factors of fire protection performance and type certification were presented: 1. Volume of medium retained in test parts; 2. Mass flow of medium; 3. Pressure in the test parts cavity.
Abstract: Fire protection performance is one of the most important capabilities for aircraft engine, since the result may be hazardous in the case of a fire condition. According to fire protection regulation CCAR 33.17 of China Civil Aviation Regulations, fire-proof tests of a specific pipeline, a fuel tank and a fuel filter assembly were carried out. Test c...
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Temperature Control of Flat-panel Airlift Photobioreactors for Microalgae Prduction – A Numerical Investigation
Issue:
Volume 8, Issue 6, November 2019
Pages:
79-87
Received:
23 October 2019
Accepted:
14 November 2019
Published:
6 December 2019
Abstract: Within the blue biotechnology, the cultivation of microalgae has an important role. Aimed is the production of valuable bio products, including biofuels. Microalgae can be cultivated in open raceway ponds or in different types of photobioreactors (PBRs). Besides their higher investment costs, PBRs are gaining more importance due to the possibilities they offer for controlling the production parameters like, light, pH, Nutrients, CO2 supply, etc. This study presents the influence of temperature control on the operating cost of a culture in a flat-panel airlift photobioreactor, based on a simulation model. The data used are those of a coastal range in Cyprus, at Zygi, with mild climate, requiring heating in Winter and cooling in the Summer. Microalgae grow optimally between 20°C and 24°C, but choosing the right set temperatures for Winter and Summer plays an important role in the economy of the system. The most energy saving option seems to be that of a stepwise set-temperature control, with a temperature varying in steps between 19 and 24°C that are considered to be economic acceptable minimum and maximum values. For the estimation of the yearly fuel consumption of the PBR a new term, the Burner ON Ratio was introduced.
Abstract: Within the blue biotechnology, the cultivation of microalgae has an important role. Aimed is the production of valuable bio products, including biofuels. Microalgae can be cultivated in open raceway ponds or in different types of photobioreactors (PBRs). Besides their higher investment costs, PBRs are gaining more importance due to the possibilitie...
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Research on Gas Drainage Pump Design and Prevention Measures in Gas-rich Mine
Yang Shouguo,
Lu Xuefu,
Jin Jia
Issue:
Volume 8, Issue 6, November 2019
Pages:
88-93
Received:
4 November 2019
Published:
9 December 2019
Abstract: In gas-rich mines, gas problems exist in the process of mining, which not only increases the difficulty of mining coal resources, but also reduces the production of coal mines safety. Typically, gas explosion was one of the most serious disasters in coal mines, which caused large numbers of casualties and destruction of facilities. In order to prevent the gas accident during the mining process in the coal seam of Tashan Mine (which located in Datong, Shanxi Province, China), the No.3~5 coal seam were taken as an example, the gas drainage pumps and the pipe laying methods were designed, basing on its hydrogeological conditions, development methods and coal mining methods. The gas drainage pump with a flow rate of 309.95 m3/min was designed, which helps to make better use of existing mine gas resources better and more efficiently. In addition, integrated control technologies such as gas drainage, gas concentration monitoring, effective ventilation and control of fire sources were used to reduce the probability of gas explosion in the No.3~5 coal seam of Tashan Mine. Strengthen the prevention and control of gas disasters, so as to ensure the smooth progress of coal mine safety production. The gas drainage system has built with this design, which runs for several months, and achieved a good performance. Therefore, the design approach can be referred to other similar mines.
Abstract: In gas-rich mines, gas problems exist in the process of mining, which not only increases the difficulty of mining coal resources, but also reduces the production of coal mines safety. Typically, gas explosion was one of the most serious disasters in coal mines, which caused large numbers of casualties and destruction of facilities. In order to prev...
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Study on Causes and Control for the Transmission Difference of Urban Gas Enterprises
Issue:
Volume 8, Issue 6, November 2019
Pages:
94-99
Received:
22 September 2019
Published:
26 December 2019
Abstract: Urban gas enterprises are different in management due to different regions and cultures. With the development of science and technology and the Internet, new equipment and technology are gradually combined with natural gas metering management. However, due to the incomplete development of this field in China, there is still a lot of room for progress, especially at the level of specific enterprises. At present, the metering management of many enterprises is still in the same stage At the primary stage, this paper focuses on the analysis of the causes of gas transmission difference, through observation and experiment, to find out the solutions with strong operability, and to provide valuable reference for enterprises to strengthen the management of gas transmission difference. At the beginning of this paper, the author points out the significance of the research on the measurement and transmission difference of natural gas, and then analyzes the causes of the measurement and transmission difference of natural gas through practical cases combined with historical research and experimental data. The best way is to explore the causes of the measurement and transmission difference of various types of natural gas and summarize the effective methods to reduce the measurement and transmission difference of natural gas.
Abstract: Urban gas enterprises are different in management due to different regions and cultures. With the development of science and technology and the Internet, new equipment and technology are gradually combined with natural gas metering management. However, due to the incomplete development of this field in China, there is still a lot of room for progre...
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