基于层次分析法的新型滤筒除尘器性能指标权重分析

以内部具有锥体结构的新型滤筒除尘器为研究对象,以滤料特性、粉尘负荷、过滤风速、喷吹压力、清灰方式和新型滤筒结构参数为性能评价因子,基于层次分析法建立新型滤筒除尘器性能评价因子分析的递阶层次结构模型,根据Delphi专家调查法建立各层次的判断矩阵,通过计算对影响新型滤筒除尘器选型的主要性能指标除尘效率、压力损失、清灰效果、处理风量及经济性等进行权重分析.结果表明,各性能评价指标对新型滤筒除尘器性能的影响权重为滤料特性新型滤筒结构参数粉尘负荷过滤风速清灰方式喷吹压力,各性能指标对新型滤筒除尘器选型影响的相对权重为除尘效率经济性压力损失清灰效果处理风量.     

“2006年水泥技术大会暨第八届全国水泥技术交流大会”论文征集

一种耐高温、耐高湿、耐腐蚀、耐磨蚀的颗粒床除尘器，在水泥行业有可能获得新生。早在十九世纪末，就有人申请了用颗粒床过滤器净化废糖浆的技术专利。我国也曾有人专门研究、设计了这种除尘器，但都由于没有找到颗粒层再生清灰的好方法，致使多数设计没有得到实际应用。     

垂直移动床颗粒层除尘器有可能在水泥厂获得应用

一种耐高温、耐高湿、耐腐蚀、耐磨蚀的颗粒床除尘器,在水泥行业有可能获得新生。早在十九世纪末,就有人申请了用颗粒床过滤器净化废糖浆的技术专利。我国也曾有人专门研究、设计了这种除尘器,但都由于没有找到颗粒层再生清灰的好方法,致使多数设计没有得到实际应用。近年来,一     

XKHDC新型烘干机袋式除尘器的结构设计特点

文章介绍了XKHDC新型烘干机袋式除尘器的结构设计特点,探讨了滤袋尺寸及进气和排气管道的设计对立窑袋式除尘器的占地空间、气流分布及管道阻力的影响。本研究中着重研究了烘干机袋式除尘器各种过气及排气形式、清灰方式及清灰机构的差别和特点。该新型烘干机展式除尘器的设备投资比其它型号烘干机陈尘设备低20％左右。     

HKD新型烘干机袋式除尘器的结构设计特点

文章介绍了HKD新型烘干机袋式除尘器的结构设计特点，探讨了滤袋尺寸及进气和排气管道的设计对立窑袋式除尘器的占地空间、气流分布及管道阻力的影响，着重研究了烘干机袋式除尘器各种进气及排放形式、清灰方式及清灰机构的差别和特点。该新型烘干机袋式除尘器的设备投资比其它型号烘干机除尘设备低20％左右。     

窑尾反吹风袋式除尘器设备节能升级改造

针对反吹风袋式除尘器在新型干法水泥工艺及生产过程中暴露出来的清灰压力低,清灰效果不理想,且容易形成死角,清灰不均匀,造成除尘器压力损失过大等设计缺陷,通过分析论证,改造内部结构和控制系统,解决设备阻力偏高、电耗过大等实际问题,并达到超低排放目标.     

循环流化床锅炉清灰器改造

通过对循环流化床锅炉所用传统的压缩空气声波清灰器缺点分析，重点介绍了新型的蒸汽声波清灰器在渭河煤化工集团循环流化床锅炉上的成功改造过程，旨在为同类型锅炉清灰器设计选型、改造提供有益的借鉴作用。     

流化床与固定床耦合反应器中的颗粒磨损

在直径50mm的冷模流化床与固定床耦合反应器中,考察了活性炭颗粒在130～150℃及不同气速下的磨损情况,得到了不同气速下固定床中圆柱状颗粒的磨损率随时间的变化关系,同时分析了滞留在流化床、固定床及袋滤器中的细颗粒在不同气速下的粒径分布与质量分布.结果表明,颗粒在该耦合反应器中磨损严重,在0.212～0.424m/s气速下,固定床中颗粒质量损失可达3%～4%,流化床中颗粒平均粒径由200μm降至100μm以下.     

颗粒沉积量对细颗粒层清灰力和清灰效率的影响

采用中径3.31 mm的细颗粒在PPS普通滤料和涤纶覆膜滤料表面形成不同沉积量的颗粒层,用缓慢增加反吹气流和低压脉冲清灰的方法进行清灰测试. 随着颗粒层沉积量增加,颗粒层低压脉冲清灰的效率均提高,缓慢反吹的清灰力也呈减小趋势. 涤纶覆膜滤料表面颗粒层沉积量从200 g/m2增长到401 g/m2时,平均清灰应力从350 N/m2降到100 N/m2,比PPS滤料低90 N/m2以上. PPS滤料上低压脉冲清灰效率随颗粒层沉积量的增加线性增加,涤纶覆膜滤料上颗粒层沉积量超过200 g/m2时非线性快速增加,缓慢反吹产生的颗粒层碎片均随着颗粒层沉积量增加而增大.     

流化床与固定床中甲烷裂解制氢过程的比较

本文对流化床与固定床操作模式下的甲烷催化裂解制氢进行了比较研究。以纯甲烷为原料，分别考察了75Ni10Cu15Al和2Co1Al（原子比）催化剂上流化床与固定床操作模式下甲烷裂解制氢反应，结果表明流化床中的甲烷裂解反应速率较高。流化床操作的高表观速率主要是因为此模式下有效消除了外扩散，同时极大减少了内扩散阻力。同时不同温度下催化剂上生长的碳的TEM表征发现，金属颗粒尺寸随反应温度增加而增加，表明催化剂烧结是失活原因之一。但相同温度下固定床中催化剂金属颗粒尺寸明显大于流化床中的金属颗粒尺寸，且金属颗粒尺寸分布变宽，这说明流化床反应器有利于阻止金属颗粒的烧结。通过对甲烷裂解催化剂失活原因的分析发现流化床中催化剂颗粒的流态化有利于延长催化剂活性寿命。     

Minimum fluidization velocities for gas–solid 2D beds

The purpose of this study is to present some new data to estimate minimum fluidization velocity (u_mf) in a two-dimensional bed. When investigating fluidodynamics with a fluidized bed, a fixed normalised parameter is needed. This parameter stands for the degree of mixing and its outcome between the phases. It is well known that the minimum fluidization velocity is normally used to represent the transition from fixed to fluidized bed conditions. Fluidization experiments with different height and weight bed and for different particle sizes were carried out in a two-dimensional fluidized bed. Minimum fluidization velocity was found to be a function of bed weight, particle diameter and column width.     

Hydrodynamic characteristics of activated carbon in air- and water-fluidized beds

The hydrodynamic characteristics of small hydrophobic activated carbon particles were determined in air flowing through both fixed and fluidized bed layers and water flowing through an inverse fluidized bed. Based on experimental data the Ergun-equation was corrected. A new relationship is proposed to predict the pressure drop in a fixed bed with gas flowing by using the minimum fluidizing velocity (u _mf ) and particle terminal velocity (u _t ). Apparent density of oven-dried activated carbon increases with filling the internal pores by water. After the bed density reaches the density of water, the system switches from an inverse fluidized layer into the classical fluidized state. Finally, it has been demonstrated that the Reynolds number (Re _mf ) at u _mf associated with the original Archimedes number (Ar) for gas-solid fluidized system and the modified Ar numbers characterizing the inverse fluidized beds lie on identical curves.     

GMC高温脉喷袋除尘器及其应用介绍

立窑烟气具有烟气量、烟气温度和湿含量波动范围大,露点温度高,烟气中粉尘的颗粒较细及碱含量高等特性,必须选用高效的电除尘器或袋除尘器,才能达到新标准GB4915-2004要求的排放浓度,其中袋除尘器更具优越性和应用性。合肥水泥研究设计院开发的GMC高温脉喷袋除尘器除尘效率高,烟气排放浓度(标况下)低于50mg/m3,还能有效去除SO2,NOX和CO等有害气体,是立窑烟气治理的有效设备。     

烧结复合式烧结金属丝网颗粒移动床过滤器研究

A new gas clean-up process called “integrated sintered metal screen moving granular bed“ (ISMSMGB) for the integrated gasification combined cycle (IGCC) and pressured fluidized bed combustion (PFBC) was developed on the basis of a sintered metal candle filter and a cross-flow moving granular bed filter. This is a combination of the surface and deep bed filtering processes. A set of facilities was established and a series of cold model tests were carried out. The dust removal efficiency and the pressure drop of the filter were measured and analyzed. The results show that this process features the advantages of the moving bed for high capacity as well as high inlet dust load and the surface filter for high efficiency. Meanwhile, the granules moving downward cleans the cake on the screen surface, so that the system is operated at steady state.     

Simultaneous SO2/NOx removal by a powder-particle fluidized bed

Simultaneous dry removal of SO₂ and NO_x from flue gas has been investigated using a powder-particle fluidized bed. In a process of flue gas desulfurization by use of solid sorbents such as FeO (dust from a steel plant) and CuO, the smaller the particle size of sorbents, the higher the expected SO₂ conversion. In a powder-particle fluidized bed (PPFB), fine particles less than 40 μm in diameter fed into the bed are fluidized with coarse particles. But only the fine particles are entrained from the bed, and their residence time in the bed is remarkably long.

The reduction of NO_x with NH₃ in the fluidized bed is catalyzed by coarse particles or both coarse and fine particles. In this study, PPFB was applied to simultaneous dry SO₂/NO_x removal process, and several kinds of sorbents or catalysts were evaluated in a PPFB. Using the selected sorbents and catalysts, kinetic measurements were made in the temperature range of 300 to 600°C. SO₂ removal efficiencies were affected by reaction temperature, sorbent/S ratio, and static bed height. NO_x removal efficiencies in excess of 95% were achieved at NH₃/NO_x mole ratio of 1.0. When FeO was used as sorbent, SO₂ conversion increased with increasing temperature and reached 80% at 600°C.     

固定床颗粒层过滤效率的正交试验及回归分析

用固定床颗粒层过滤实验装置,以石英砂为过滤颗粒在常温下进行过滤效率实验。采用四水平正交表安排试验,利用量纲分析和SPSS软件进行多元非线性回归处理试验数据,得到了过滤效率与表观过滤速度、过滤层厚度、过滤颗粒平均粒径、粉尘浓度和过滤时间5个因素的回归方程,从而对过滤效率变化规律进行分析。通过实验表明过滤性能对粉尘粒径具有明显选择性。     

利用套管结构实现液固均匀分布

基于分支管路原理和液固流态化的性质,提出了一种用于多管液固循环流化床的组合式液固分布器.利用建立的小型冷态试验装置,考察了管束中的颗粒循环速率和固含率.试验结果表明,在多管循环液固流化床下管箱安装组合式分布器可以实现固体颗粒在管束中的均匀分配.     

CFD Simulation on Drying and Dust Integration in Fluidized Bed Spray Granulation

Fluidized bed spray granulation is used to produce porous granular particles from suspensions, solutions, and melts. In this work, the drying of the spray and the drying of the particles in the fluidized bed are simulated using the Two Fluid Model (TFM) with the Eulerian-Eulerian approach. Using the wetted surfaces of the particle, the dust integration is implemented. The model is used to simulate the particle growth for a semi-batch fluidized bed spray granulation process.     

入口粉尘浓度对新型旋流-颗粒床耦合分离器特性的影响

通过大型冷模实验,考察了入口粉尘浓度对某连续操作新型旋流-颗粒床耦合分离器压降和除尘效率的影响特性。结果表明,入口粉尘浓度越大,达到平衡时分离器的压降越大,压降增速越快,入口粉尘浓度为59.13 g/m3时,分离器平衡压降最大为1.2 kPa;入口粉尘浓度越低,分离器分离效率越高。分离器颗粒床层内捕集颗粒含尘量与再生效率有关,再生尘源浓度越小,分离器压降达到平衡越快。当再生尘源浓度由58.18%降至23.67%,装置压降由1.5 kPa降至1.2 kPa;随着再生尘源浓度降低,分离器除尘效率略微下降。入口粉尘浓度和再生尘源浓度对分离器压降影响的结果一致,对分离器效率影响的结果不同。     

煤气化合成气除尘用陶瓷膜研究进展

当前,世界各国均在研究增压流化床联合循环发电技术和整体煤气化联合循环发电技术中的高温除尘技术。介绍了陶瓷膜除尘分离的原理,以及其在国内外的应用和研究现状。认为陶瓷膜优点突出,在煤气化合成气除尘及高温气体除尘领域具有广阔的应用前景。