氧-液化石油气火焰性能分析与切割工艺

按熵焓理论讨论了氧-液化石油气的燃烧过程,分析火焰燃烧时各区域的产热及其能量平衡,解释氧-液化石油气燃烧温度偏低的原因,提出氧-液化石油气切割适合于厚板切割的理论依据,同时介绍了氧-液化石油气切割工艺和技术方面的要点。     

燃气热水器电热水器使用费用比较

<正> 液化石油气与电的比较 每钢瓶液化石油气净重假如为15 kg,每钢瓶15 kg的液化石油气目前北京约为 45元,则1kg液化石油气应为3元人民币。1kg液化石油气完全燃烧后产生的可利用热量约为10000kcal。而1度(1kW·h)电如转换为热量则为860 kcal,也就是说如要与1kg液化石油气     

400m^3液化石油气球形储罐的焊后热处理

介绍了采用内部燃烧法对400 m3液化石油气球形储罐进行焊后整体热处理的过程和操作要领,以及最终达到的热处理效果。     

高温燃气流动粒子炉及其应用

RLQ-φ40×60-11型高温燃气流动粒子炉是山东工业大学、济南铁路局科研所共同研究设计、济南热处理设备厂制做的新型节能设备,已在生产中应用,收到较好的效果。本文就这一新型设备的结构、特点及应用情况做一概括介绍。一、设备组成及其结构特点本文所要介绍的是用液化石油气与压缩空气混合气在流态化床内直接燃烧加热的内热式流动粒子炉,液化石油气既做为热源又做为粒子流态化气体,又是保护气氛。     

400m3液化石油气球形储罐的焊后热处理

介绍了采用内部燃烧法对400 m3液化石油气球形储罐进行焊后整体热处理的过程和操作要领,以及最终达到的热处理效果.     

液化石油气罐用钢07MnNiMoVDR焊后热处理工艺

对液化石油气低温储罐用钢07MnNiMoVDR的焊后热处理工艺进行研究.结果表明,07MnNiMoVDR钢焊后经过560~600 ℃消除应力热处理,焊接接头力学性能最好,满足了液化石油气低温储罐和散装运输液化气体船舶制造焊接技术要求.     

可燃气体在钢管公司应用的前景

国内用液化石油气进行焊接和切割始于 70年代,因种种原因没有很好推广应用, 90年代切割用乙炔燃气仍占 90％左右,基本属单一燃气能源结构。而日本 80年代初,液化石油气用量已达到总用气量的 61％。我国石油资源丰富,开发利用石油化工的副产品作为焊接和切割燃气具有广阔的前景。 丙烯、丙烷、液化石油气均是石油化工的副产品,属于碳氢化合物,化学性质不活泼。其燃点高,燃烧速度慢,爆炸极限范围小,不易产生回火爆炸。对于压力、温度、冲击等敏感度比乙炔低,用于火焰加工是比较安全的。使用烷烃气、液化石油气、天然气是世界工业燃气发展的方向,现在这类气体约占燃气消耗总量的 65％,乙炔仅占 35％。随着人类对环境保护意识的加强,使用“绿色燃气”的趋势逐渐增强。     

07MnNiMoV DR液化石油气储罐用钢焊接工艺及焊后热处理研究

对建造液化石油气低温储罐所用07MnNiMoV DR钢的焊接工艺及焊后热处理等进行了实验研究。结果表明,采用30kJ/cm线能量焊接,焊后经580℃消除应力处理,其焊接接头的力学性能最好,满足散装运输液化气体船舶制造的焊接技术条件要求。     

液化石油气残留物分析方法探讨

本文主要针对液化石油气中残留物项目,在检测过程中发现的问题和油渍观察值结果的表示,探讨其变化时对车用液化石油气使用性能的影响。     

海洋石油某终端处理厂天然气腐蚀与化学防护研究初探

为探究海洋石油某终端处理厂天然气腐蚀与化学防护技术,对几种脱硫剂产品的性能进行了室内评价,实验结果表明,吗啉衍生物类脱硫剂CL-03和油溶性三嗪衍生物类脱硫剂CL-04的脱硫性能优异,且加药浓度500mg/L,作用时间大于3h时,可使某海洋石油终端处理厂液化石油气铜片腐蚀程度保持在1b以内,符合国标要求。CL-03和CL-04在现场试验过程中,均能有效去除天然气中的硫化氢并降低液化石油气铜片腐蚀程度,且处理后并不明显影响液化水油气质量。某海洋石油终端处理厂天然气脱硫最佳方案是,在天然气海管登陆点附近使用脱硫剂CL-03,在液化石油气中加注脱硫剂CL-04。     

Chemical route to synthesis of mesoporous ZnO thin films and their liquefied petroleum gas sensor performance

In the present work, we report base free chemical bath deposition (CBD) of mesoporous zinc oxide (ZnO) thin films from urea containing bath for liquefied petroleum gas (LPG) sensor application. Mesoporous morphology with average pore size ∼2 μm and wurtzite crystal structure are confirmed from scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The surface of ZnO is hydrophobic with water contact angle 128 ± 1°. Optical study reveals the presence of direct bad gap with energy 3.24 eV. The gas sensing study reveals the mesoporous ZnO is highly selective towards LPG as compared with CO₂ and maximum LPG response of 52% is achieved upon the exposure of 3900 ppm LPG at 573 K as well as good reproducibility and short response/recovery times.     

In-situ deposition of silica layers during the operation of a micro-gas turbine and their effect on the oxidation of superalloy blades

Silica-based oxide layers were deposited in-situ on turbine blades made from Inconel 713 during the operation of a 13 kg_f-class gas turbine, and their effect on the ex-situ oxidation behavior of the blades at 1050 °C was examined. The two turbines were driven by burning liquid petroleum gas (LPG), one turbine at a rotation speed of 35,000 rpm for 4 h (TB04), and the other at 42,000 rpm for 8 h (TB08). For deposition, tetraethylorthosilicate (TEOS) was sprayed into the fuel line immediately ahead of the combustion chamber. The TEOS-to-LPG ratio for TB04 and TB08 was maintained at 5.4 wt. % and 2.3 wt. %, respectively. Directly after operation, the turbine blades were coated with silica layers to a thickness of ∼10 μm, independent of the operating conditions. These oxide layers on the blades provided excellent protection against oxidation during both operation and the ex-situ isothermal oxidation test.     

LPG储罐焊接接头低温抗断裂性分析

通过ＣＯＤ试验测定了两种用于ＬＰＧ储罐建造的结构钢焊接接头低温抗断裂性能，研究了材料与工艺组合、试验温度等因素对焊接接头低温抗断裂性的影响，所得结果为ＬＰＧ储罐的选材与焊接工艺制定、结构的抗断裂分析提供了基础数据。     

含钒超细晶粒WC—（Ni,Fe）系硬质合金复合粉的研制

用超声喷雾制备的（Ｗ,Ｎｉ,Ｆｅ,Ｖ）系纳米级复合氧化物粉末,在管式还原炉内以不同流量的液化石油气还原碳化,制备含Ｖ的超细晶粒硬质合金粉末。用化学分析、Ｘ射线衍射（ＸＲＤ）和透射电镜（ＴＥＭ）确定粉末的成分、物相组成及粉末颗粒形貌和粒度范围。将合金粉末热压成合金试样,观察Ｖ元素的分布及对ＷＣ晶粒长大的抑制作用。结果表明,１２０ｍＬ·ｍｉｎ(－１)的液化气流量,虽可使复合氧化物转变成ＷＣ,ＶＣ,Ｎｉ,Ｆｅ相,但会造成合金粉中含有很高的游离Ｃ。当液化气流量为４３ｍＬ．ｍｉｎ(－ｌ)时,合金粉的物相组成及游离Ｃ含量全部达到要求。电镜观察证实,Ｖ元素可以抑制ＷＣ晶粒长大,并主要分布在粘结相中     

埋地液化石油气储罐阴极保护的设计与施工

在液化气加气站的液化石油气（LPG）地下储罐施工中,牺牲阳极阳极保护与防雷,防静电要求之间存在较明显的矛盾,但又是安全运行所必需的,通过对加气站的监检及对有关资料的查阅,提出了LPG地下储罐阴极保护设计与施工方面的一些建议。     

16MnR钢液化石油气球罐失效分析

对从某厂整体LPG球罐上取下的严重腐蚀球壳板进行了宏观分析，并对其裂纹和鼓泡特征进行光学显微镜和扫描电镜等微观分析.结果表明，球罐失效与钢中沿带状珠光体分布的长条型MnS夹杂和LPG中H2S浓度密切相关.     

Preparation and properties of porous ceramics from spodumene flotation tailings by low-temperature sintering

Porous ceramics were prepared with spodumene flotation talings (SFT), kaolin and low-melting point glass (LPG) powder, whose pores were formed by the chemical reaction of hydrogen peroxide (H₂O₂). LPG was used to reduce the sintering temperature of porous ceramics and kaolin was used to realize the adsorption to methylene blue (MB) of porous ceramics. The average flexural strength, compressive strength, apparent porosity, water absorption and maximum MB adsorption capacity were 5.60 MPa, 4.66 MPa, 52.27%, 44.32% and 0.7 mg/g, respectively. Moreover, the results of orthogonal experiments present that the sintering temperature and the dosage of H₂O₂ had great influence on the mechanical properties and apparent porosity of porous ceramics, respectively. The main reason for the improvement of mechanical properties of porous ceramics was that LPG gradually became soft with increasing the sintering temperature, which made the mineral particles adhere to each other closely. Kaolinite was not completely converted into metakaolin at 550 °C, which might be the main reason why porous ceramics had adsorption properties.     

Rapid chemical vapor infiltration of C/C composites

With liquid petrol gas (LPG) as carbon source, carbon felt as porous perform and hydrogen as diluent, C/C composites were fast fabricated by using a multi-physics field chemical vapor infiltration (MFCVI) process in a self-made furnace. A set of orthogonal experiments were carried out to optimize parameters in terms of indices of density and graphitization degree. The results show the optimal indices can be achieved under the conditions of temperature 650 °C, LPG concentration 80%, gas flux 60 mL/s, total pressure 20 kPa, infiltration time 15 h. The verification experiment proves the effectiveness of the orthogonal experiments. Under the optimal conditions, the graphitization degree of 75% and bulk density of 1.69 g/cm are achieved with a uniform density distribution. At the same time, a new structure is obtained.     

Numerical simulation and analysis on the deep drawing of LPG bottles

Deep drawing is one of the most used sheet metal forming processes in the production of automotive components, LPG bottles and household goods, among others. The formability of a blank depends on the process parameters such as blank holder force, lubrication, punch and die radii, die-punch clearance, in addition to material properties and thickness of the sheet metal. This paper presents a numerical study made on the deep drawing of LPG bottles. In particular, the application of both variable blank holder forces and contact friction conditions at specific location during deep drawing are considered. The numerical simulations were carried out with DD3IMP FE code. A variable blank holder force strategy was applied and the numerical results were compared with results from other blank holder force schemes. It is evident that the proposed variable blank holder force scheme reduces the blank thinning when compared to other schemes; the friction coefficient also has a significant influence on the stress–strain distribution.