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Search Results: 1 - 10 of 57731 matches for " LU Chun-xi "
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Distributions of Solids Hold-up in the Airlift Loop Fluidized Bed of a Riser-Airlift Loop Fluidized Bed Coupled Reactor
提升管-环流床耦合反应器环流床内的固含率分布

WANG De-wu,LU Chun-xi,
王德武
,卢春喜

过程工程学报 , 2008,
Abstract: Based on olefin reduction technology with auxiliary reactor for FCC naphtha upgrading, a large-scale cold model experimental setup with a riser-airlift loop fluidized bed coupled reactor was established. The distributions of solids hold-up in the upper airlift loop fluidized bed were investigated. The effects of superficial gas velocity and outer solids flux on the radial distribution of local solids hold-up were analyzed. The fluidization quality of coupled airlift loop fluidized bed and coupled convention...
Recent advances in waterglass sand technologies
ZHU Chun-xi
China Foundry , 2007,
Abstract: This paper reports some new understandings and advances in waterglass sand technologies. The multiple chemical modification process can increase the binding strength of the waterglass sand by up to 50%-70%. Therefore, the additions of the modified waterglass can be decreased to 3.0%-4.0% for CO2 process and to 2.0%-2.5% for organic ester hardening process, and greatly improve the collapsibility and reclaimability of the sand. Based on the new understandings and experimental results reported in this paper, several original ideas, such as nano modification, have been proposed to promote advances of waterglass sand technologies.
Flow Properties of High Sulfur Petroleum Coke in a Strong-mixing Reactor
高硫焦用强混反应器流动特性

WANG Tao,LU Chun-xi,SHI Ming-xian,
王涛
,卢春喜,时铭显

过程工程学报 , 2004,
Abstract: A new cold strong-mixing reactor for burning high sulfur coke was designed based on the development of fluidization and the application of correlative new technology. The reactor consists of a mixed zone and a lift zone. Experiments were systematically conducted to investigate hydrodynamic behaviors of the high sulfur coke simulating particles in the mixed zone, with superficial gas velocity from 6 to 20 m/s and solids circulating rate from 20 to 232 kg/(m2.s). The experimental results demonstrated that the mixed zone can be divided into two sections in the axial direction and two or three regions in the radial direction. A Uniformity Index of the Radial Distribution(UIRD) was proposed to characterize radial flow structures for solids local density and particle velocity.
Experimental Study on Bed Density in a Novel Gas-Solid Annulus-lifted Air Loop Reactor
环隙气升式气固环流反应器内床层密度的实验研究

LIU Meng-xi,XIE Jian-ping,LU Chun-xi,WANG Zhuan,
刘梦溪
,谢建平,卢春喜,王祝安

过程工程学报 , 2008,
Abstract: 针对工业化中气-固环流反应器存在的缺陷,提出了一种新型的环隙气升式气固环流反应器.在一套冷模装置内系统地考察了局部床层密度分布.实验中实现了稳定、连续的环隙气升式环流,环流推动力随着环隙区表观气速的增加而增加,随着导流筒区表观气速的增加而减小,当导流筒区表观气速为0.2m/s时,颗粒环流方向改变为中心气升式.受结构特性的影响,催化剂密度在导流筒区和环隙区沿径向的分布具有一定的不均匀性,在底部r/R≤0.47区域颗粒未能充分流化,床层密度接近820kg/m3,在底部0.47≤r/R≤1.0区域颗粒流化较好,床层密度小于450kg/m3;随着环隙区表观气速由0.2m/s增加至0.54m/s,环隙区、导流筒区平均密度分别降低约70和33kg/m3,随着导流筒区表观气速由0.06m/s增加至0.2m/s,环隙区平均密度增加约90k9/m3,导流筒区平均密度降低约33kg/m3.
A study on landscape sustainability for agri-pastural ecotone in Horqin Sandy Land
科尔沁沙地农牧交错区景观持续性研究

CHANG Xue-li,LU Chun-xi,GAO Yu-bao,
常学礼
,鲁春霞,高玉葆

自然资源学报 , 2003,
Abstract: 科尔沁沙地农牧交错区景观持续性的分析表明,在不同时间尺度上,景观多样性的持续性增加1.038(±0.033),而景观优势度持续性下降0.873(±0.112),说明在1958年固定沙丘地占主导地位的景观逐渐演化成流动沙丘、半固定沙丘、固定沙丘和农田相间分布、平分秋色的景观。在农牧业生产活动的影响下,景观格局的持续性在空间形状的变化上趋向复杂(景观分维数持续性为1.008),而其相邻性下降(景观修改分维数0.953)。斑块尺度上,不同时间尺度的分析显示,流动沙丘和半固定沙丘斑块面积持续性增加,而固定沙丘和农田斑块面积持续减少;从斑块格局的持续性来看,半固定沙丘地空间格局的持续性呈增加的趋势最明显,为1.038(±0.087),固定沙丘地空间格局的持续性呈减少的趋势最明显,为0.806(±0.032);40年来科尔沁沙地的农牧交错活动对斑块修改分维数的持续性影响是一致的,呈下降的趋势,说明该过程减少了景观中斑块间的相邻性。
Relationship of ground biomass and plant diversity at different desertification stages in Horqin sandy grassland
科尔沁沙地不同沙漠化阶段植物种多样性与沙地草场地上生物量关系研究

CHANG Xue-li,LU Chun-xi,GAO Yu-bao,
常学礼
,鲁春霞,高玉葆

自然资源学报 , 2003,
Abstract: 论文从植被的种丰富度和功能多样性两个方面研究不同沙漠化阶段科尔沁沙地植物种多样性与沙地草场地上生物量的关系。相关分析表明,在科尔沁沙地不同沙漠化阶段,植物种多样性和沙地草场地上生物量的关系与多样性指数计算的基本单位有关。研究结果显示:①依据一年生、多年生和灌木等生活型为划分标准的功能多样性,在固定沙丘、半流动沙丘和流动沙丘阶段与沙地草场地上生物量的关系最密切,关联系数分别为-0.534、-0.574和-0.431。以豆科植物、C3植物和C4植物为划分标准的功能多样性,在半固定沙丘阶段与沙地草场地上生物量的关系最密切,关联系数为0.722。②在不同的沙漠化阶段,生活型多样性与地上生物量的关系呈负相关。说明在不同沙漠化程度的草场中,植物生活型组成的不均匀,有利于提高沙地草场地上生物量。③从不同生活型在各个沙漠化阶段中的种丰富度特征来看,一年生植物最高,多年生植物次之,灌木最低,平均值分别为9(±6.0)、3(±2.6)和1.8(±1.0),说明一年生植物在沙地植被组成中占主导地位。同时,研究结果表明,在不同沙漠化阶段中,以豆科植物、C3植物和C4植物划分的功能类型组的平均重要值以C4植物最高,C3植物次之,豆科最低,分别为48(±12.3)、39.7(±3.6)和12.3(±14.3),说明C4类植物在科尔沁沙地植
Structural Optimization of a Novel Gas-Solid Separator Incorporating Inertial and Centrifugal Separation
基于离心与惯性作用的新型气固分离装置的结构

LIU Xian-cheng,LU Chun-xi,SHI Ming-xian,Beijing,China,
刘显成
,卢春喜,时铭显

过程工程学报 , 2005,
Abstract: As the feed stuffs of fluid catalytic cracking (FCC) become increasingly heavier, a new regeneration technology combining post coke-burning riser and conventional turbulent bed regenerator has been developed in this study. One of the key components of this technology is the gas-solid separator located at the outlet of the riser regenerator, having the advantages such as simple structure, high separation efficiency, low pressure drop and flexible operation. To meet these requirements a novel gas-solid separator incorporating inertial and centrifugal separation was investigated in detail. Talcum powder was employed as solid medium. Separation efficiency and pressure drop were experimentally tested in nine separator configurations under the same gas velocity and particle concentration at the separator inlet. The results show that a reasonable scheme is as follows: no baffle to block the solid circulation, no hem at the slots to obstruct gas entering the centre pipe, and dimensionless radius of centre pipe between 0.50 and 0.55.
Flow Behavior of High-sulfur Petroleum Coke with Different Particle Size Distributions in a Novel Strong Mixing Reactor
不同粒度分布高硫焦颗粒在强混燃烧器内的流动特性

RUAN Yu-jun,LU Chun-xi,SHI Ming-xian,
阮宇军
,卢春喜,时铭显

过程工程学报 , 2006,
Abstract: The flow behaviors of high-sulfur petroleum coke with three different particle size distributions in a novel strong-mixing riser reactor were systematically investigated.The reactor was mainly composed of the pre-mixed zone and the lift zone,the structural dimensions of the two zones were respectively 240 mm ID,3000 mm length and 70 mm ID,9000 mm length.The experiment was carried out with the superficial gas velocity from 8 to 18 m/s and solids circulating rate from 60 to 200 kg/(m2?s).Through the experimental measurements on the axial and radial distributions of solids holdup and velocity in the strong-mixing riser reactor,it is found that,with increasing the proportion of fine powder in the coarse particles appropriately,the cross-section mean solids velocity will reduce,and the solids holdup will increase,moreover the back-mixing of particle is intensified and the residence time of particle will extend,which are beneficial to sufficient combustion of high-sulfur petroleum coke.
Back-mixing of Particles in a Gas-Solid Loop Reactor
气固环流反应器内颗粒返混特性

YAN Chao-yu,LU Chun-xi,GUO Rong-mian,
严超宇
,卢春喜,郭荣绵

过程工程学报 , 2009,
Abstract: Under different operation conditions, by optical fiber measurement with suitable data processing, the local and cross-sectional particle back-mixing characteristics in the riser and annular sections of a large-scale compound fluidized bed combustor were investigated. The experimental results show that the radial distribution profiles of particle local back-mixing ratio (R_(mix,L)) is uniform in the annulus, but non-uniform in other three regions (draft tube, bottom and particle separation regions) of the loop reactor. The value of R_(mix,L) in the loop reactor varies from 0 to 0.9. And the value of the particle cross-sectional back-mixing ratio ranges from 0.1 to 0.6 in the whole region of the reactor.
Improvement of regional quasi-geoid in Qomolangma(Mt. Everest) and determination of orthometric elevation
珠峰地区似大地水准面精化与珠峰顶正高的确定

GUO Chun-Xi,NING Jin-Sheng,CHEN Jun-Yong,WANG Bin,LU Yang,SUN Feng-Hua,
郭春喜

地球物理学报 , 2008,
Abstract: 本文使用珠峰及其周边地区的重力数据与SRTM3、1∶50000 DEM、GTOPO30地形数据,以该地区的44个GPS水准点为控制,选择国内外的EGM96、WDM94、IGG05B、DQM2000D和CG03C作为参考重力场模型,采用移去-恢复技术,首次完成了珠峰地区分辨率为2.5′×2.5′高精度似大地水准面,其精度达到±9 cm,并据此推算了珠峰顶高程异常值. 再利用登山线路上的新测重力点与珠峰地形数据,依据严格的重力归算理论及移去-恢复技术,完成了珠峰顶似大地水准面与大地水准面差值计算,即珠峰正常高与正高的换算.
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