660MW超超临界满负荷时小机凝汽器液位高解决方法探讨

近期,托电10号机在机组满负荷660MW运行时,给水泵汽轮机凝汽器液位一直上涨,且无法控制,威胁机组安全运行,机组被迫降负荷运行。根据这一特殊情况,在保证机组安全运行和不进行停机检修的情况下,通过原因分析和解决方法探讨实施,解决机组满负荷时给水泵汽轮机凝汽器液位高的问题,保证机组安全、经济、稳定运行。

选煤厂过滤机液位计算机监控系统

介绍了某选煤厂过滤机液位自控系统的组成、结构以及控制功能实现的具体方法,论述了工控组态软件的功能和特点,为选煤厂实现过滤机液位自动化控制提供了一种行之有效的方案。

选煤厂自动化及圆盘真空过滤机液位自动控制

文章主要阐述了选煤厂自动化的主要内容,以及选煤厂用圆盘真空过滤机液位的自动控制技术等问题。

探究板坯连铸机液位波动机理及控制措施

当板坯在实际生产的过程当中,若出现了较大的结晶器液位波动,无论是对于铸板坯的总体质量,还是生产的顺利进行都会产生严重的影响,所以需要对结晶器液位波动进行严格的控制,将其控制在最小的范围之内,帮助连铸生产顺利的进行。因此,本篇文章主要对于板坯连铸机液位波动机理以及控制措施进行认真的分析和研究,希望能够在有效提高板坯合格率等方面提到一些参考与帮助。

Mechanism of different particle sizes of quartz activated by metallic ion in butyl xanthate solution

To investigate effect of metallic ion activation on different particle sizes of quartz in butyl xanthate solution,six common ions(Pb^(2+),Cu^(2+),Fe^(3+),Fe^(2+),Mg^(2+) and Ca^(2+)) were introduced as activators.The approaches of micro-flotation,adsorption test and zeta potential measurement were adopted to reveal the mechanism of ion activation.The results show that Pb^(2+),Cu^(2+) and Fe^(3+) are effective activators for the flotation of quartz in butyl xanthate solution because of their absorption on activated quartz surface.Average recoveries of fine particles(<37 μm) are greater than those of coarser particles(37-74 μm),suggesting that the former is easier to be activated and more likely to be floated and thus entrained in sulphide concentrate.From another perspective,addition of metallic ions(Pb^(2+),Cu^(2+) and Fe^(3+)) renders zeta potentials move positively,and addition of the same metallic ions and butyl xanthate makes zeta potential drop apparently,which support a mechanism where they adsorb onto quartz surface,resulting in an expected increase in butyl xanthate collector adsorption with a concomitant increase in the flotation recoveries.

Membrane Potentials Across Hybrid Charged Mosaic Membrane in Organic Solutions

Membrane potentials across hybrid charged mosaic membrane in organic solutions were measured. Equilibrium swelling degree （SD） and fixed charge density in both organic solutions and water were also determined. Ethylene glycol, ethanol, n-propanol and glycerol were used as organic solutes; meanwhile 0.001mol-dm^-3 aqueous KCl solution was utilized as a strong electrolyte to measure the electrical difference. Equilibrium swelling degree indicated that it could be affected by the density of organic solutes; while it enhanced with the increasing density of these solutes. The measurement of fixed charge density showed that the membrane had the maximal absolute value in water among these solvents whether for cationic or anionic groups; the difference of dielectric constant between the water and the organic solutes might be responsible for these change trends. It was confirmed that membrane potentials increased with both the increasing concentration of the organic solutions and the elevated pH values. These results demonstrated that the characteristics of the hybrid charged mosaic membrane could be highly impacted by the properties of the organic solutes. A theoretical modal for charged membranes in ternary ion systems of weak electrolyte can be used to explain the above-mentioned phenomena.

Physical Modelling of the Drained Flow on a Suction Box of a Papermachine

Suction boxes are used in the paper industry to simultaneously drain a pulp suspension and form a fibre mat （or filter cake）. This research addresses the modelling of fibre deposition in the forming unit of an industrial papermachine, assuming a filtration process, and that of the flowing suspension drained through the building fibre mat and the wire on a suction box. From experimental data of the cumulative drained V volume, per unit surface area, for two vacuum pressures △P and 6 dwell times t, an extension of the classical law （t/V） versus V is proposed, validated and applied. This relation enables determining the average specific filtration resistance of the fibre mat over the box and the mass of solids deposited before and over the suction box. The model obtained is as precise as 1% and can be used to limit and reduce the energy consumption of drainage vacuum assisted devices such as suction boxes in the forming unit of industrial papermachines.

Stability Monitoring and Control of Generation Based on the Synchronized Measurements in Nodes of Its Connection

Synchronized distributed measurements of mode parameters create a technical feasibility for development and implementing new technologies of control the mode stability and the admissibility of EPS （electric power system） mode. Discussion will focus on different models obtained from data synchronized measurements for operational and automatic emergency control without EPS being totally controlled. According to the proposed technology, the generator＇s output power restrictions are determined in real-time by the terms a static stability using the generators＇ mode model as a multipole with connection nodes of generators＇ electromotive forces （the matrix of SMA （self and mutual admittances） of electromotive forces of generators）. Potential applications of the technology are distribution network with the main substation and generators of commensurable capacity, and transmission network with large power plants （generators） distributed into the network. The one-level control system for all of generators with defining the generator＇s power limits relative to the main substation is implemented in the first case. In the second case, the two-level control system is brought in, based on the separation of large and small generation motion. The results of the method and technology efficiency verification are shown in the paper, by both computer simulations of the power system modes and its physical model.

浅谈液位检测在啤酒业的应用及维护

在啤酒生产过程中，啤酒灌装的液位高度测量是质量控制的主要指标之一。利用液位检测机，可以实现啤酒液位的自动测量，达到及时、准确和有效地控制灌装液位之目的，不仅能满足啤酒灌装机正常运转和灌装质量保障要求，还可以减少工作人员的劳动强度，及时提供质量决策数据，提高啤酒自动化信息管理水平。本文简单描述了液位检测机的基本结构及其在生产中的应用，使整个生产系统运行更顺畅，大大提高了生产效率。