A tilt sensor with a compact dimension based on a long-period fiber grating

A tilt sensor with a compact dimension based on a long-period fiber grating (LPG) is proposed and experimentally demonstrated. The LPG is fixed in a rigid Plexi-glass tubular with a slant orientation and half of the LPG is immersed into the NaCl aqueous solutions, whereas the other half is exposed in air. The tilt angle is obtained by monitoring the dip wavelength shift of the LPG, which changes gradually when the immersed length of the LPG varies with the tilt angle. Experimental results show that the average sensitivity 0.077 nm/° is achieved within the measurement range from -30° to 30° at the static measurement.     

LPG发动机系统及其应用

概述LPG燃料的特性及使用LPG作燃料的发动机的优点，重点介绍了1—3t叉车上采用的尼桑H系列汽油机与美国IMPCO LPG转换装置配套的汽油／LPG双燃料系统。     

液化石油气站储罐泄漏封堵技术初探

根据液化气站火灾特点 ,提出了防止及改进措施 ,主要针对液化气储罐下部液态泄漏 ,采用水封隔离封堵法 ,同时转移液化石油气 ,解决了及时扑救的措施 ,为遏制火灾事故的进一步扩大 ,防止爆炸事故的发生 ,为液化气储站的抢险工作赢得时间。     

The effect of hydrogen enrichment on exhaust emissions and thermal efficiency in a LPG fuelled engine

The concept of hydrogen enriched LPG fuelled engine can be essentially characterized as low emissions and reduction of backfire for hydrogen engine. The purpose of study is obtaining low-emission and high-efficiency in LPG engine with hydrogen enrichment. In order to determine the ideal compression ratio, a variable compression ratio single cylinder engine was developed. The objective of this paper is to clarify the effects of hydrogen enriched LPG fuelled engine on exhaust emission, thermal efficiency and performance. The compression ratio of 8 was selected to minimize abnormal combustion. To maintain equal heating value, the amount of LPG was decreased, and hydrogen was gradually added. In a similar manner, the relative air-fuel ratio was increased from 0.8 to 1.3 in increment of 0.1, and the ignition timing was controlled to be at MBT each case.     

首台15MnNbR钢制2000m3液化石油气球罐设计

介绍了国内首次建造的2台15MnNbR钢制2000m^3液化气球罐的设计情况。对我国大型液化气球罐的选材，设计及建造有一定的指导作用。     

液化石油气切割焊接技术的应用

介绍了液化石油气良好的切割和焊接性能以及燃气成本显著降低的特点,从而液化石油气的应用成为企业提高产品质量,降低成本、增加效益的有效途径之一。     

球墨铸铁液化石油气阀门的研制

对球墨铸铁液化石油气阀门的材质、生产工艺、产品性能和使用性能进行了系统的研究。指出以球铁代替WCB铸钢生产液化石油气阀门的可行性及较好的经济效益     

Experimental study on the icing characteristics of LPLi injectors under various injection conditions

Development of alternative fuels has been increasing to replace conventional fuels because of severe environmental pollution from the exhaust emissions of ground vehicles and the depletion of fossil fuels. LPG (Liquefied petroleum gas) fuel provides clean energy for gasoline-fueled engines and LPG fuel R&D (Research & development) has actively progressed in reaching the application stage. However, the icing phenomenon in liquid-phase LPG injection systems remains a major problem. The purpose of this study was therefore to investigate the temperature distribution on the icing protection tip and icing formation characteristics under various test conditions (i.e. injection pressure, injection frequency, injection duty). The results showed that increasing the injection frequency induced a big the temperature drop, whereas increasing the injection duty decreased the temperature drop under the same test conditions. Increasing the injection pressure caused a small temperature drop because of an increase in the injection velocity, which meant that much of the injected LPG evaporated at a region distant from the nozzle tip. The protection tip with a double-hollow structure had a smaller the temperature drop than the all-in-one type protection tip made of the same material (copper).

     

液化气自动灌装设备控制系统的研制

现在民用液化气消费量逐年增加,研制开发低成本、操作方便、可靠性高（高性价比）的燃气液化气灌装设备具有良好的市场前景。本文介绍了液化气自动灌装设备控制系统的组成、工作原理、硬件部分及软件部分设计。     

球罐用15MnNbR钢焊接接头力学性能试验研究

为了将15MnNbR钢板用于建造大型液化气球罐，根据确定的焊接工艺和焊接工艺参数，研究了焊接接头的拉伸性能、系列冲击性能、无塑性转变温度、断裂韧性等，各项力学性能表明：爆接接头可满足球罐的设计要求并且保证球罐的安全运行。     

基于热力学模型的液化石油气发动机 燃烧放热及排放分析

通过燃用汽油及液化石油气的对比试验得出了两种燃料的对比燃烧特性,从而在燃烧机理上分析了其燃烧及排放特性。结论表明以汽油机改装的LPG(液化石油气)发动机自身带有一些缺陷,但通过改装及调试是可以获得较理想的动力性并改善排放指标的。     

LPG摩托车燃料系统预加热装置的研究与设计

对摩托车发动机缸头盖进行改进设计,在其内部设置U型铜管,利用发动机做功时产生的热量对液相LPG进行预加热,有效解决了减压调节器在工作过程的冷冻结霜现象.试验与计算结果表明,LPG摩托车燃料系统预加热装置结构简单、稳定可靠,综合性能好.     

15MnNbR钢的性能及其在球罐上的应用

对以为370MPa级(drb≥530MPa)的15MnNbR钢进行了力学性能、抗硫化氢应力腐蚀性能及其焊接性能试验。结果表明：该钢具有优良的综合性能，其强度和韧度优于16MnR钢，而焊接性能及抗硫化氢应力腐蚀性能与16MnR相近，是用于大型液化石油气球罐的理想钢种。     

低功耗烧结气敏元件制备和气敏特性研究

未经掺杂的金属氧化物半导体气敏传感器通常灵敏度很高，但选择性较差。为提高选择性和一致性，设计了一种特殊结构的低功耗SnO2烧结气敏元件的制备方法，测试了SnO2烧结气敏元件的气敏特性。制备的SnO2烧结气敏元件在40mW的加热功率条件下，100ppm的CO气氛中灵敏度达到3，响应时间仅为4s；在180mW的加热功率条件下，对氢和碳氢化合物（如CH4和LPG）敏感。这类低功耗烧结气敏元件选择性和一致性好，有望用于室内煤气泄漏检测等场合。     

A fiber loop mirror temperature sensor demodulation technique using a long-period grating in a photonic crystal fiber and a band-pass filter

A fiber loop mirror (FLM) temperature sensor using a long-period grating (LPG) written in a photonic crystal fiber (PCF) and a band-pass filter as a demodulator is proposed. By utilizing the stable filtering function of the LPG in the PCF, the resonant wavelength variation of the FLM with temperature is transferred effectively to the intensity variation of the output light. By monitoring the light intensity of the band-pass of the filter, temperature applied on the FLM is deduced by an optical power meter. Experiment results show that the temperature sensitivity is high as ~1.742 dB/ °C when a filter with a full width at half maximum 3 nm and the center at 1545 nm is used.     

An experimental study on spray and combustion characteristics of LPG for application in direct-injection

As an alternative fuel that can be used in SI engines, LPG is a clean fuel with larger H/C ratio compared to gasoline, low CO₂ emission, and small amount of pollutants such as sulfur compounds. In the Spark-ignition (SI) engine, Direct injection (DI) technology can significantly increase the engine volumetric efficiency and decrease the need for a throttle valve. DI allows engine operation with the stratified charge, which enables a relatively higher combustion efficiency. Stratified charge can be supplied to nearby spark plugs to allow for overall lean combustion, which improves thermal efficiency and can cope with problems regarding emission regulations. In this study, a visualization experiment system that consists of visualization combustion chamber, air supply control system, emission control system, LPG fuel supply system, electronic control system and image data acquisition system was designed and manufactured. For all cases for which ignition was successful, flame propagation image was digitally recorded using ICCD camera, and the recorded flame propagation characteristics were examined. This study, in its results, is expected to make a contribution in terms of important data for the design and optimization of a Spark-ignited direct injection (SIDI) LPG engine.

     

燃气叉车行业的现状和未来

分析了国内外燃气叉车现状、发展、应用及市场前景。     

液化石油气(LPG)汽车的分析与研究

对液化石油气 (L PG)汽车的分类、燃料供给系统及主要特点进行了简要的分析与研究。     

球罐人孔开孔补强的计算

以1000m^3液化石油气球罐下极板人孔的开孔为例,结合等面积补强法的原理,介绍一种当球罐上开孔范围超出GB150范围时的补强计算方法。     

280m~3内河散装液化气运输船的研发

详细介绍了内河散装液化气运输船研发的整个过程,以及其中的难点及解决办法。