石灰石／石灰—石膏湿法脱硫反应塔模型比较

就二氧化硫的污染控制最常用方法－石灰石／石灰－石膏湿法脱硫的几种主要的反应塔模型进行了比较。讨论了已经发展的几种基本传质吸收模型,包括薄膜理论、渗透理论以及表面更新理论在脱硫反应塔建模中的应用,特别是对于新型脱硫塔－液柱脱硫塔的建模作了初步探索,并从模型基本理论的角度分析了现行的各种脱硫反应塔工艺之间的差别,以及如何通过加强传质反应来提高脱硫设备的运行效率等问题。     

Effect of operating parameters and reactor structure on moderate temperature dry desulfurization

A moderate temperature dry desulfurization process at 600-800 degrees C was studied in a pilot-scale circulating fluidized bed flue gas desulfurization (CFB-FGD) experimental facility. The desulfurization efficiency was investigated for various operating parameters, such as bed temperature, CO2 concentration, and solids concentration. In addition, structural improvements in key parts of the CFB-FGD system, i.e., the cyclone separator and the distributor, were made to improve the desulfurization efficiency and flow resistance. The experimental results show that the desulfurization efficiency increased rapidly with increasing temperature above 600 degrees C due to enhanced gas diffusion and the shift of the equilibrium for the carbonate reaction. The sorbent sulfated gradually after quick carbonation of the sorbent with a long particle residence time necessary to realize a high desulfurization ratio. A reduced solids concentration in the bed reduced the particle residence time and the desulfurization efficiency. A single-stage cyclone separator produced no improvement in the desulfurization efficiency compared with a two-stage cyclone separator. Compared with a wind cap distributor, a large hole distributor reduced the flow resistance which reduced the desulfurization efficiency due to the reduced bed pressure drop and worsened bed fluidization. The desulfurization efficiency can be improved by increasing the collection efficiency of fine particles to prolong their residence time and by improving the solids concentration distribution to increase the gas-solid contact surface area.     

山丘小区域地下水补给量的计算

鲁中山丘区是由各种不同地层出露组成的,在多个水文流域水循环要素分析计算的基础上,对河川径流进行基流分割,反推地下水补给量,建立流域年均降水入渗补给系数与各种地层出露面积占流域总面积权重间的最佳回归方程,利用该方程和地层分布及降水量推算山丘小区域地下水的补给量,为山丘小区域地下水持续开发利用与保护提供科学依据。     

Simultaneous removal of SO2 and trace As2O3 from flue gas: mechanism, kinetics study, and effect of main gases on arsenic capture

Sulfur dioxide (SO2) and trace elements are pollutants derived from coal combustion. This study focuses on the simultaneous removal of S02 and trace arsenic oxide (As2O3) from flue gas by calcium oxide (CaO) adsorption in the moderate temperature range. Experiments have been performed on a thermogravimetric analyzer (TGA). The interaction mechanism between As2O3 and CaO is studied via XRD detection. Calcium arsenate [Ca3(AsO4)2] is found to be the reaction product in the range of 600-1000 degrees C. The ability of CaO to absorb As2O3 increases with the increasing temperature over the range of 400-1000 degrees C. Through kinetics analysis, it has been found that the rate constant of arsenate reaction is much higher than that of sulfate reaction. SO2 presence does not affect the trace arsenic capture either in the initial reaction stage when CaO conversion is relatively low or in the later stage when CaO conversion is very high. The product of sulfate reaction, CaS04, is proven to be able to absorb As2O3. The coexisting CO2 does not weaken the trace arsenic capture either.     

卷烟机刀头试验台的设计

针对YJ19和YJ19A卷接机组两种机型中存在的刀头部件调整困难这一问题 ,设计了适合以上两种机型的刀头试验台。该试验台采用了独立的润滑系统、传动系统以及气动控制进刀技术 ,能够独立对组装好的刀头进行调整和试运转、且不影响其它部件的组装调整。通过该试验台对刀头部件进行调整和试运转 ,可大大节省整机的安装、调试时间 ,并可通过检测油路的润滑和漏油情况等 ,及时发现并排除故障或隐患     

交流伺服系统在ZJ15卷接机组中的应用

利用交流伺服系统对ZJ15卷接机组进行了技术改进 ,介绍了交流伺服系统的基本工作原理 ,及ZJ15卷接机组改进的实施方案、设备选型和调整。改进后原设备传动结构大大简化 ,噪声降低 ,维修费用减少 ,而且提高了设备的可靠性 ,并为其他国产卷烟机的改进提供了技术参考。     

Influence of chemical and thermodynamic parameters on the flue gas desulphurization efficiency in a circulating fluidized bed

IneductionEven there are W successful Mods Of flue gasdesulPhuriZation (FGD), people have been searching fOrnew ones, which are more econondcal, with higherefficiency and more reliable. Lap, Thyssen and WullffMasclunen developed the teChnulogy of circulatinfluldized bed flue gas desulPhurization (CFBFGD) inlate 1980s, which is similar with circulating fluidized bedboilers in enhancing chendcal reachvity As flue gas andabsothent are Inixed in theulent bed, SO2 is absothedand changed in…     

简易液柱式湿法烟气脱硫装置的试验研究

介绍了一种简易液柱式湿法烟气脱硫装置,对该装置的脱硫特性进行了试验,研究分析了一些重要因素对系统脱硫效率的影响变化规律。结构表明;当塔内烟气速度小于3m/s。液气比为12L/m^3时,系统的脱硫效率在80%以上,整个试验装置的阻力损失小,运行可靠,有利于装置在工业上的实际应用。     

对数D/A转换器及在水声系统中的应用

简要介绍了对数D／A转换器AD7111的结构、特点、工作原理，并与同类产品AD7110进行了对比。指出了使用中的注意事项。给出了应用于声纳和水下寻的声系统试验测试的半物理仿真系统设计实例，该系统设计获部级科技进步二等奖。     

钒微合金化高强钢电炉炼钢工艺研究

基于电炉流程工艺研特点,发挥电炉钢N含量高的特点,采用在钢中加入VN合金进行V微合金化处理,控制钢水中[O]小于0.025%,[S]小于0.005%,采取提高VN合金收得率的工艺措施,使V的收得率在90%以上,加入VN 合金N的收得率在60%～70%,充分发挥了V晶粒细化和沉淀强化的作用,成功开发了V微合金化屈服强度550 MPa级的高强度热轧钢板.