电厂化学汽水监督与炉水加药处理技术的思考

电力设备的稳定运行离不开有效的电厂化学监督手段,目前电厂化学监督方式主要以汽水监督为主。通过汽水监督各项指标的控制,能够有效地减少管道和热力设备出现问题,并且在提高汽水质量的同时,避免积盐结垢现象的发生,从而有效地保障电厂的安全生产。本文通过对电厂化学汽水监督与炉水加药处理技术进行深入的分析,从而更好的阐述如何才能有效地保证机组汽水品质。

关于电厂化学水汽监督与炉水加药处理技术的探讨

化学水汽监督是现代电厂的重要管理内容之一,而开展这项工作的目的是保证热力设备运行的安全性和稳定性,它对电厂的安全运行起着非常重要的作用。炉水的加药处理是保证电厂锅炉运行安全的有效手段,它能够有效减少因水质问题而引发的运行故障。简要阐述了电厂化学水汽监督和炉水加药处理技术的相关内容,以期为日后工作的顺利进行提供参考。

造球过程在线水分检测及自动加水控制技术工业应用研究

目前,技术水平不断提升,造球工艺技术要求不断提高,使用新型化在线水分检测以及自动加水控制系统对造球过程效率以及质量具有重要作用。造球水分控制以及自动加水控制研究过程中,需要实现工业化的应用验证,获得相应实质性的结果,以此为造球自动化研究奠定重要基础。我国现阶段的造球工艺技术较高,提高球团矿产品质量,增加企业经济效益,需要不断研究造球工艺以及技术,最终实现全自动化生产。本文通过对造球过程在线水分检测及自动加水控制技术工业应用进行分析,结合现阶段应用情况背景,提出应用措施,促进技术水平提升,提高产品质量。

电厂化学汽水监督与炉水加药处理技术的探讨

简要阐述了电厂化学汽水监督的重要性,进而分别从多方面分析电厂化学汽水监督,并提出炉水加药处理技术,旨在有效预防和控制热力设备腐蚀结垢问题。

对内燃机燃油掺水技术改造效果的探讨

对现代节能技术中燃油掺水节油技术各有论述,现将作者本着求实的态度对该技术进行了较为深入的探讨和评价。本期做了刊登。通过大量数据指出目前燃油掺水技术尚不能全面推广,仍有许多技术问题有待解决;同时指出,燃油掺水技术对于降低汽车尾气中有害成份的排放具有明显效果。期盼对燃油掺水技术的研究,必将会有新的成就。

对螺旋钻机成孔孔内加水理论的探讨

桩基础是深基础的一种.特点是承载力高,沉降速度慢,沉降量小且均匀,目前被广泛采用.摩擦灌注桩是一种常见的基础型式,主要依靠桩壁与土之间的摩擦力承载.钻机钻孔时,是否可以往孔内加水,规范无明确说法,因此在施工中说法不一.笔者通过实践,认为螺旋钻机钻孔遇到坚硬状态或硬塑状态土层,孔内适量加水是切实可行的.

Study on Optimization of Hydroponic Technology of Virus-free Potato Plantlets in Winter in Chengdu Plain

The effects of different heating measures on breeding virus-free potato plantlets with hydroponic technology were studied in this paper. The virus-free tube plantlets of potato （Favorita） were used as test material. A total of 3 treatments were designed, including traditional hydroponics （CK）, installing heaters （T1） and in- stalling heaters and thermal insulation device （T2）. The results showed in the Chengdu Plain in low-temperature winter, the installing of heaters and covering of thermal insulation device could maintain the hydroponic water temperature at 15-22 ~C. The potato seedlings grown in heaters and thermal insulation device-installed seedbed rooted 6.4 d earlier and emerged 13 d earlier compared to that in tradi- tional seedbed. The growth of potato seedlings grown in heaters and thermal insu- lation device-installed seedbed was more robust. Their root length, stem diameter, plant height, leaf number and fresh weight were all higher than that of traditional potato seedlings. The tuber number per plant in T1 group reached 1.7 and in T2 group reached 3.57 42 d after the cutting of hydroponic seedlings, while then the plantlets in CK group just turned into the aeroponics stage. Therefore, heating hy- droponics is conducive to advancing the cutting of virus-free seedlings and breeding robust water-cultured seedlings. Moreover, the fruiting of aeroponics seedlings is al- so advanced. The heating hydroponics plays an important role in actual production.

Potential Hazards in Smoke-Flavored Fish

Smoking is widely used in fish processing for the color and flavor. Smoke flavorings have evolved as a successful alternative to traditional smoking. The hazards of the fish products treated by liquid-smoking process are discussed in this review. The smoke flavoring is one important ingredient in the smoke-flavored fish. This paper gives the definition of smoke flavorings and the hazard of polycyclic aromatic hydrocarbons （PAHs） residue in the smoke flavorings on the market. It gives also an assessment of chemical hazards such as carcinogenic PAHs, especially Benzo-[α]pyrene, as well as biological hazards such as Listeria monocytogenes, Clostridium botulinum, histamine and parasites in smoke-flavored fish. The limitations in regulations or standards are discussed. Smoke flavored fish have lower content of PAHs as compared with the traditional smoking techniques if the PAHs residue in smoke flavorings is controlled by regulations or standards.

Additive Manufacture of Ceramics Components by Inkjet Printing

In order to build a ceramic component by inkjet printing, the object must be fabricated through the interaction and solidification of drops, typically in the range of 10–100 p L. In order to achieve this goal, stable ceramic inks must be developed. These inks should satisfy specific rheological conditions that can be illustrated within a parameter space defined by the Reynolds and Weber numbers. Printed drops initially deform on impact with a surface by dynamic dissipative processes, but then spread to an equilibrium shape defined by capillarity. We can identify the processes by which these drops interact to form linear features during printing, but there is a poorer level of understanding as to how 2D and 3D structures form. The stability of 2D sheets of ink appears to be possible over a more limited range of process conditions that is seen with the formation of lines. In most cases, the ink solidifies through evaporation and there is a need to control the drying process to eliminate the "coffee ring" defect. Despite these uncertainties, there have been a large number of reports on the successful use of inkjet printing for the manufacture of small ceramic components from a number of different ceramics. This technique offers good prospects as a future manufacturing technique. This review identifies potential areas for future research to improve our understanding of this manufacturing method.

Enhancing Biological Wastewater Treatment with Chitosan

Chitin and chitosan have been applied to biological wastewater treatment.From a number of parallel comparison experiments,it can be concluded that the application of chitin and chitosan can both enhance the biological treatment,besides which chitosan is more efficient than chitin.The study on the enhancement mechanism reveals the difference between the two additives:chitosan improves the sludge structure and settlibility,while chitin acts as a kind of carrier for microorganism in the biological treatment system.

Enhanced-hydrogen gas production through underground gasification of lignite

Underground coal gasification is one of the clean technologies of in-situ coal utilization.Hydrogen production from underground gasification of lignite was investigated in this study based on simulation experiments.Pyrolysis of lignite, gasification activity, oxygen-steam gasification and the effect of groundwater influx were studied.As well, the advantages of lignite for stable underground gasification were analyzed.The results indicate that lignite has a high activity for gasification.Coal pyrolysis is an important source of hydrogen emission.Under special heating conditions, hydrogen is released from coal seams at temperatures above 350 °C and reaches its maximum value between 725 and 825 °C.Gas with a hydrogen concentration of 40% to 50% can be continuously obtained by oxygen-steam injection at an optimum ratio of steam to oxygen, while lignite properties will ensure stable gasification.Groundwater influx can be utilized for hydrogen preparation under certain geological conditions through pressure control.Therefore, enhanced-hydrogen gas production through underground gasification of lignite has experimentally been proved.

Thermal Analysis of Composite Cements

The hydration of cement compounds gives hydrated compounds, which allow linking together, the different particles and aggregate of cement, and gives the concrete the required qualities. The dynamics of hydration reactions will depend on many factors, such as the fineness of cement, the ratio w/c during hydration, temperature, mixing technique, and the presence of additives in blended cement, as pozzolan, tuff and slag from blast furnaces. We studied the thermal and kinetic reactions of Portland cement hydration, and its variants with different additions using a differential scanning calorimetric analysis. The parameters from these models of curves allow us to evaluate the enthalpies, and the degree of progression of this blended cement, and finally determine their activation energies. We can say that the hydration of Portland cement is due to a series of reactions as （ C3S,C2S,C3A and C4AF reactions with water） and each of them, has its own kinetic, the experimental measurement of the heat of hydration, allows us to represent the overall kinetics of these reactions values of activation energy, they are therefore apparent and global energy. In our experiments, significant differences in these physicochemical parameters were observed, depending on the additive used.

Determinants of Adoption of Sawah Rice Technology among Farmers in Ashanti Region of Ghana

The purpose of this study is to identify the determinants of adoption of sawah technology in Ashanti region of Ghana. It identifies those independent variables that explain adoption and can also facilitate further dissemination and adoption of sawah technology. Sawah refers to leveled rice field surrounded by banks with inlet and outlet for irrigation and drainage. This study uses data from 108 farmers randomly selected from 198 sawah farmers in the study area. Regression analysis showed that age, educational level and year of experience in rice production were the personal factors that determined the adoption of sawah technology among the respondents. The result further showed that contact with extension agents, attendance in previous sawah trainings, land tenure arrangement, yield from sawah farm and attributes of sawah technology determined adoption. This study suggested that adoption of sawah technology should be targeted at young, educated and experienced farmers. Also, security of land must be ascertained by farmers in order to enhance adoption, continuous and sustained use of sawah technology.

Investigating design principles of micropatterned encapsulation systems containing high-density microtissue arrays

Immunoisolation is an important strategy to protect transplanted cells from rejection by the host immune system.Recently,microfabrication techniques have been used to create hydrogel membranes to encapsulate microtissue in an arrayed organization.The method illustrates a new macroencapsulation paradigm that may allow transplantation of a large number of cells with microscale spatial control,while maintaining an encapsulation device that is easily maneuverable and remaining integrated following transplantation.This study aims to investigate the design principles that relate to the translational application of micropatterned encapsulation membranes,namely,the control over the transplantation density/quantity of arrayed microtissues and the fidelity of pre-formed microtissues to micropatterns.Agarose hydrogel membranes with microwell patterns were used as a model encapsulation system to exemplify these principles.Our results show that high-density micropatterns can be generated in hydrogel membranes,which can potentially maximize the percentage volume of cellular content and thereby the transplantation efficiency of the encapsulation device.Direct seeding of microtissues demonstrates that microwell structures can efficiently position and organize pre-formed microtissues,suggesting the capability of micropatterned devices for manipulation of cellular transplants at multicellular or tissue levels.Detailed theoretical analysis was performed to provide insights into the relationship between micropatterns and the transplantation capacity of membrane-based encapsulation.Our study lays the ground for developing new macroencapsulation systems with microscale cellular/tissue patterns for regenerative transplantation.