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Industrial Water (industrial + water)

Distribution by Scientific Domains

Chemistry	50%

Selected Abstracts

Energy and exergy system analysis of thermal improvements of blast-furnace plants

INTERNATIONAL JOURNAL OF ENERGY RESEARCH, Issue 2 2006
Andrzej Zi
Abstract The blast-furnace process dominating in the production of steel all over the world is still continuously improved due to its effectiveness (exergy efficiency is about 70%). The thermal improvement consist in an increase of the temperature of the blast and its oxygen enrichment, as well as the injection of cheaper auxiliary fuels. The main aim is to save coke because its consumption is the predominating item of the input energy both in the blast-furnace plant and in ironworks. Besides coke also other energy carriers undergo changes, like the consumption of blast, production of the chemical energy of blast-furnace gas, its consumption in Cowper-stoves and by other consumers, as well as the production of electricity in the recovery turbine. These changes affect the whole energy management of ironworks due to the close connections between energy and technological processes. That means the production of steam, electricity, compressed air, tonnage oxygen, industrial water, feed water undergo changes as well. In order to determine the system changes inside the ironworks a mathematical model of the energy management of the industrial plant was applied. The results of calculations of the supply of energy carriers to ironworks can then be used to determine the cumulative energy and exergy consumption basing on average values of cumulative energy and exergy indices concerning the whole country. Such a model was also used in the system analysis of exergy losses. Copyright © 2005 John Wiley & Sons, Ltd. [source]

Stress corrosion cracking and selective corrosion of copper-zinc alloys for the drinking water installation,

MATERIALS AND CORROSION/WERKSTOFFE UND KORROSION, Issue 4 2009
E. Brandl
Abstract Despite a generally good corrosion resistance to tap and industrial water, many brass taps and fittings have failed in the past by stress corrosion cracking (SCC) and selective corrosion (dezincification or preferred removal of a phase). The experimental investigations of the present study clarify the influence of the ammonia concentration on the two types of corrosion. Notched specimens made of the alloys CuZn39Pb3, CuZn40Pb2, CuZn37, CuZn36Pb2As and CuZn21Si3P are polarized anodically in pure tap water and tap water with realistic ammonia concentrations (15 and 30 ppm) under a simultaneous mechanical loading condition. The influence of stress and of the third alloying elements lead and arsenic are investigated and evaluated. The experiments show that the ammonia additions significantly increase the risk of dezincification of the ,-,-brasses. The arsenic in the CuZn36Pb2As alloy avoids dezincification, but enhances the risk of SCC. The rate of selective corrosion and SCC consistently increases with increase in tensile stress. [source]

Environmental challenges in the energy sector: a chemical engineering perspective,

ASIA-PACIFIC JOURNAL OF CHEMICAL ENGINEERING, Issue 4 2010
Philippe A. Tanguy
Abstract The supply of energy in sufficient quantities and the access to clean water are among the most significant global challenges to address in the decades to come, as these are key elements of human well-being and further development. These challenges are of course related, and future practices must consider their connectivity. As the present energy system is clearly reaching its limits in terms of sustainability, new approaches have been proposed based on much improved energy efficiency, development of renewable and new energy sources, and the use of carbon capture and storage for fossil resources. The industrial deployment of these alternate scenarios is intrinsically related to the availability of water on a large scale. Because the access to freshwater is becoming scarce in many countries, better water practices and the exploitation of new water resources must be developed for the supply of industrial water. This paper begins with a brief description of our present energy system based on fossil resources, this being a legacy of the industrial revolution. We then review the main drivers supporting the energy and water demand, and the constraints they are facing. The final section considers several chemical engineering challenges that arise when proposing ways of dealing with the energy-environment nexus in the future. Copyright © 2010 Curtin University of Technology and John Wiley & Sons, Ltd. [source]

A structure/function study of polyaminoamide dendrimers as silica scale growth inhibitors

JOURNAL OF CHEMICAL TECHNOLOGY & BIOTECHNOLOGY, Issue 6 2005
Konstantinos D Demadis
Abstract Dendrimers have attracted immense attention during the last decade due to their interesting properties both from a basic and an applied research viewpoint. Encapsulation of metal nanoparticles for catalysis, drug delivery and light harvesting are only some applications of dendrimers that are breaking new ground. A novel application of dendrimer technology is described in the present paper that relates to industrial water treatment. Industrial water systems often suffer from undesirable inorganic deposits. These can form either in the bulk or on metallic surfaces, such as heat exchangers or pipelines. Silica (SiO2) scale formation and deposition is a major problem in high-silica-containing cooling waters. Scale prevention rather than removal is highly desired. In this paper, benchtop screening tests on various silica inhibition chemistries are reported, with emphasis on materials with a dendrimeric structure. Specifically, the inhibition properties of commercially available STARBURST® polyaminoamide (PAMAM) dendrimers generations 0.5, 1, 1.5, 2, and 2.5 are investigated in detail together with other commonly-used scale inhibitors. Experimental results show that inhibition efficiency largely depends on structural features of PAMAM dendrimers such as generation number and nature of the end groups. PAMAM dendrimers are effective inhibitors of silica scale growth at 40 ppm dosage levels. PAMAM dendrimers also act as silica nucleators, forming SiO2,PAMAM composites. This occurs because the SiO2 formed by incomplete inhibition interacts with cationic PAMAM-1 and -2. The general scope of silica formation and inhibition in industrial waters is also discussed. Copyright © 2005 Society of Chemical Industry [source]