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[en] The ''Heitkamp Ingenieur- und Kraftwerksbau GmbH'' is a 100% subsidiary of the ''Heitkamp BauHolding GmbH'' group of companies. The group can look back to a construction tradition that goes back to more than 117 years. ''Heitkamp Ingenieur- und Kraftwerksbau GmbH'' stands for the ideal combination of engineering know-how and technical implementation. The engineering work of Heitkamp includes, amongst others, power plants, cooling towers, sewage plants, high-rise buildings, industrial structures, locks and bridges. We deliver performance and quality not only in the area of new developments but also in the area of rebuildings and modernizations of existing power plants, locks, bridges and industrial facilities. The combination of competence and innovation becomes evident through our co-leading position on the relevant market. Our clients put their trust in our ability to provide a maximum of quality and professional services. The solutions are individually and exactly tailored to the needs of the client. The satisfaction of the clients and the success is based on the cost effectiveness achieved for both parties as well as the ability to deliver the guaranteed quality. In the scope of the new construction of the nuclear power plant Olkiluoto 3 in Finland, Heitkamp Ingenieur- und Kraftwerksbau (HIKB) has received various contracts in the past few years. (orig.)
[en] The reason why a quench tower for radioactive waste incinerator was eroded seriously during the long term operation was analyzed, aiming at presenting anti-corrosion measures in aspects of material selection, medium condition and management, which is useful for us to improve the corrosion of equipment. (authors)
[en] Hearing the words ‘nuclear power’ usually conjures up images of huge power plants and cooling towers, but with small modular reactors (SMRs) and microreactors (MRs) starting to become a reality, the face and reach of nuclear power is changing. SMRs are expected to generate up to 300 megawatts (electrical) (MW(e)) of power and MRs up to 10 MW(e), depending on their designs. In addition to their modularity, some other common features are passive and built-in systems that enhance safety, the ability to efficiently and flexibly generate energy to meet fluctuating demands, and simpler designs that are faster and less complex to construct than current reactors. They also have more factory-based manufacturing possibilities, which can reduce on-site construction time and makes them easier and more cost-effective to reproduce for additional deployment.
[en] It has been performed an experiments of gases volume in expanded delay chamber during reactor operation by adding cooling towers from 4 to 6 pieces. This experiment is aimed to determine the amount of gases accumulated in the delay chamber when the reactor operates 15 MW of power affected by the temperature of the primary and secondary cooling systems. Formation of gases within the delay chamber after the reactor operation 15 MW of power for 4 days can be observed from the reactor pool level control shortly before and after the reactor is shut down. The experimental results show an increase in gases volume within the chamber delay of 6. 74 m3 when the secondary cooling system is operated with 4 cooling towers and 5.78 m3 with 6 cooling towers, thus reducing the gases by 1 m3. The results are not significant for short-term reactor operation but it would be useful if the reactor is operated for a long time to reduce the gases in delay chamber of RSG-GAS reactor. (author)
[en] In this research, a series of experiments have been performed to study the thermal resistance of an oscillating heat pipe equipped with cooling tower. The effects of filling ratio and input heating power on the thermal resistance of the heat pipe and temperatures of different sections of evaporator and condenser of the heat pipe are investigated and discussed. All tests are taken for input heating power and filling ratio in the ranges of 20–200 W and 10–60%, respectively. A correlation for the thermal resistance is presented, which the effects of input heating power and filling ratio are taken into account in this correlation. The results showed that the heat pipe with filling ratio of 40% and input heating power of 160 W has the minimum value of thermal resistance among all cases considered in this research. Moreover, the thermal resistance decreases about 86% as the input heating power increases in the range of 20–120 W, while this reduction is only 23% by increasing the input heating power in the range of 160–200 W.
[en] A conventional sequencing batch reactor (SBR) was successfully transformed to a membrane bioreactor (MBR) at an Indian casino resort and hotel, Santa Ynez, California. The technical difficulties from the existing process at the site including a 3-mm screening unit, SBR biological tanks, and sand filtration were relieved of by new biological membrane technology. As the hotel and its vicinity expanded, the existing SBR was not able to treat an increased flow, which was major driving force for such membrane-upgraded project. In addition, as the area was in a high drought zone, without meeting the purpose of water reuse, new hotel expansion was not permitted. New membrane process was designed and built with new 2-mm screening unit, pre-anoxic, oxic (or aerobic), post-anoxic, and MBR tanks along with UV disinfection. The retrofitting work was conducted, minimizing a major revision on the existing SBR structure and its civil work. Therefore, the new packaged system has brought a number of benefits to the customer, thereby utilizing reclaimed water highly meeting the California Code of Regulations (CCR) Title 22 requirements. The reclaimed water goes to toilet water, cooling tower, and irrigation. This study details how such process transformation was technically finished and would help other similar cases in terms of retrofitting exiting biological process to a membrane application without a major civil construction. The cost analysis including capital, operation and maintenance (O&M) costs was included so that it will be practical to ones who will conduct future similar projects.
[en] Quench tower unit on petrochemical plant was identified has a critical problem when it was investigated on August 2015. Four beds suspected have abnormal packing configuration. The experiment performed using gamma-ray 200 mCi Co-60. Main construction the tower consisted of bed ≠1 and ≠2 filled pall ring meanwhile bed ≠3 and ≠4 filled flexi ring and flexi grid respectively. Bed ≠1 supported by a packing support while bed ≠2, ≠3 and ≠4 arranged in series from top to the bottom on a packing support. Both packing supports collapsed then packing fall down. Plant management has no reference drawing of the tower and they were not able to evaluate the investigation result at that time. The tower has been reconstructed with new packing of the same type, but new configurations were on bed ≠2, ≠3, and ≠4. On March 2016 an experiment conducted to scan the tower in on-line while operated in 75 % production capacity. Scan purpose was to get scan profile as reference for comparison to further scan periodically, either at the time of abnormal condition or not. (author)
[en] The present paper describes the successful implementation of the restoration of water-distribution channels at the cooling tower of the Emsland nuclear power plant under the aspect of ageing management. The main challenge of aging management is the determination of potential aging mechanism and to avoid systematically and effectively their damaging influences. In the course of the annual site inspections abnormalities at the lower side of the water-distribution channels of the cooling tower were detected, analysed, and repaired. The extraordinary high chlorine equivalent of the cooling water was identified as main reason of the damages located. Due to extensive infiltration into the concrete structure, chloride-induced corrosion generates a volume expansion of the reinforcement and thereby to a blast off of the concrete covering. According to the restoration concept, the damaged concrete was removed by maximum pressure water jet blasting; where necessary the reinforcement was retrofitted and a layered concrete substitution was applied by synthetic cement mortar. The realised procedures conserve the load bearing reinforcement only for a certain period, because the permanent chloride infiltration could not be stopped. Therefore, the structure has to be monitored permanently. (orig.)
[en] The water distribution system of the cooling tower is to sprinkle the hot water on the top surface of the packing evenly. The uniformity of water dripping has a great influence on the cooling effect of the cooling tower, which is directly related to the efficiency, energy consumption and investment of the cooling tower. The design of water distribution of a super large natural counter flow seawater cooling tower (17500m2) in a nuclear power plant is carried out in this paper. Based on the weather conditions and the layout scheme of the packing, the water distribution scheme is optimized by hydraulic calculation and cooling performance composition. The final scheme meets the requirements of cooling tower water distribution uniformity and winter anti freezing operation, and improves the heat transfer efficiency of the cooling tower. (author)