Papers by Keyword: Cooling Water

Abstract: Sea surface temperatures have increased since the early 20th century by 0.7 °C from 1989–2008. Changing ocean temperature directly affects the distribution and abundance of many species and habitats, including phytoplankton, coral reefs, and pelagic fish. For species that require shallow coastal water, such as for breeding or nursery grounds, the changes forcing by the changing temperature will eventually result in major population reductions as habitats become less available, and finally become unavailable. This research is presents the application of Landsat 8 for monitoring the dinamics and distribution area of sea surface temperature changed by the heated effluent discharge from the power plant on Bhinor village, Paiton, Probolinggo, East Java from 2013-2015. Remote sensing technology using a thermal band in Operational Land Imager (OLI) sensor of Landsat 8 sattelite imagery (band 10 and band 11) is used to determine the dynamics and distribution of sea surface temperature. The Split Window Algorithm (SWA) methods is used to perform extraction of sea surface temperature (SST) with brightness temperature (BT) value calculation on the band 10 and band 11 of Landsat 8. The extraction of Landsat 8 shows the temperature around the water outlet at is higher than the natural temperature (29°C). SST near water outlet showed an increasing trend from 2013 (33°C) to 2015(36°C).

Abstract: This paper analyzed the morphology and reasons of pitting corrosion perforation of 0Cr18Ni9 stainless steel cooling water pipes in a power plant and pointed out the measures to prevent the pitting corrosion under this condition. The results showed that: the reason of pitting corrosion of 0Cr18Ni9 stainless steel cooling water pipes was the existence of multiple Cl^-and easily fouling Ca²⁺ and Mg²⁺ in water, with the corrosion products mainly the oxides of Fe and Cr; the economic measures to prevent pitting corrosion were to increase the pH of water and decrease the content of Ca²⁺ and Mg²⁺.

Abstract: This template analyzed the refrigerator condenser copper tube TP2 corrosion failure reason and compared the corrosion resistant performance of copper tube TP2, brass tube HSn70-1 and Cu-Ni tube B10. Copper tube corrosion is mainly caused by high concentrations of chloride, dirt and water scouring accelerated the corrosion process. The corrosion resistant performance of three copper tube is close to and unsuitable for the cooling water of the high salt content. A better corrosion resistance of stainless steel tube should be used as the replacement and needs to keep the purity of the heat exchange tube. For cooling water which easily causes fouling, the inside tubes should be smooth.

Abstract: A method was developed to control heterotrophic bacteria in cooling water by mixing non-oxidizing (Isothiazolinones）and oxidizing sterilization （Hydantoin）together. The result of disinfection test shows that the agent possesses a higher efficiency. At the same time the method introduced polyepoxysuccinic acid—1-Acrylanmido-2-methylpropanesul fonic acid（PESA-AMPS (10%)) in to the disinfection system. The rotary coupon test and aeration scale inhibition method show that the bactericidal agent also possesses higher anti-corrosion and inhibition rate. The concentration of heterotrophic bacteria can well be controlled below 105cfu/mL when the additional quantity of the agent changes from 100mg/L to 200mg/L.

Abstract: Waste heat utilization reduces thermal pollution and fosters energy conservation. Based on the investigation and research work on potential usages of waste heat from cooling water, the preliminary study on the eco-design of comprehensive utilization scheme of waste heat was carried out, with the application of ecological engineering theory and philosophy of eco-design. The feasibility analysis showed that the industrial use and district heating of waste heat have better environmental and economic benefits. The evaluation indexes system was established based on the positioning of final result of the ecological design of cooling water waste heat utilization scheme for a nuclear power plant.

Abstract: Under-deposit corrosion in cooling water system is often found in industries. The under-deposit corrosion rate in cooling water system is rarely found in a literature. The mechanism depends on the metal, types of deposit and corrosive species in the cooling water system. In this study, the under-deposit corrosion rates of carbon steel in cooling water at various times were determined by weight loss, profilometric and electrical resistance methods at 40C. From this experiment, these three methods showed the consistent results. The under-deposit corrosion rates of carbon steel were about 0.1-0.2 mm/y.

Abstract: Complex shape of H-beam section and uneven elimination of heat on the section result in too big temperature difference between web and flange. At the same time,as the roller cooling water forms tank on H-beam web, the section temperature difference further increases. Based on finite element analysis software DEFORM-3D, the FEM model of finished product size of H194×150×6×9 is established. Thermo-mechanical coupled method is adopted to simulate the rolling process of H-beam. The cooling water influence on section temperature distribution, equivalent stress and strain distribution is analyzed. The section temperature change characteristic are studied to provide reference for further research.

Abstract: Cooling water from some plant raises the water temperature. It disrupts the water environment balance, and affects the cooling efficiency of the plant. Therefore, it is important to learn the water environment temperature and predict temperature rise design outfall for feasibility of project. In the project sea area, there are some outfalls existed, so it is possible that the water temperature will be higher than the design value of the project and influence water environment further. In this paper, based on site survey data, the feasibility study are carried out by mathematic model simulation. The result shows that the byland make the water of two parts in the bay exchange rarely. The water temperature of CTA intake is below design temperature, and the water temperature of cooling water of CTA mainly influences about 1 km area that no serious influence to other intakes.

Abstract: The present results showed that cooling water (CLW) was more easy to be contaminated than the condensed water (CDW) of central aircondition by Legionella in high air temperature and humidity, and the Legionella was not observed in all sample of the cold medium water (CMW) of central aircondition. The air temperature and relative humidity have significant impact on Legionella. No sample was positive while the average relative humidity was lower than (77.08 ± 1.30) %, and the high value of the ratio of positive samples occurred while the average air temperature and the average relative humidity reached to (26.00 ± 0.35) oC and (85.15 ± 0.74) % respectively. It should be attached importance to the Legionella infection and Legionnaires’ disease prevalence resulted from central aircondition, and the cooling water and condensed water should be sterilized regularly for the prevention and control of Legionella disease.

Abstract: Heat pump is widely used in many fields, and it has advantages of energy-saving, environment-friendly and good economy, etc. Coal mine drainage, cooling water from cooling tower of power plant and exhaust air in coal mine have stable temperature throughout the year, and they are good heat (cold) source for heat pump. By analyzing technical and economic performance of heat pump, several ways and purposes of heat pump used in coal mine are proposed, and the technical processes are given. Application of heat pump to recycle energy from coal mine drainage, cooling water and exhaust air is beneficial to improving economic efficiency and achieving sustainable development for coal mine.