The Hokkaido Electric Power Company , or Hokuden for short, is the monopoly electric company of Hokkaidō, Japan. It is also known as Hokuden, Dōden, and HEPCO. The company is traded on the Tokyo Stock Exchange , Osaka Securities Exchange , and Sapporo Securities Exchange. According to the company profile, during fiscal 2011 , 26% of the electricity generated was from nuclear, 31% from coal, 15% from hydro, 8% from oil and 2% from 'new energy' sources.Hokkaido only has one nuclear power station, the Tomari Nuclear Power Plant. Wikipedia.
Mitsubishi Group, Hokkaido Electric Power Co., Tohoku Electric Power Co., Tokyo Electric Power Company, Chubu Electric Power Co., Hokuriku Electrical Power Company, Kansai Electric Power Co., Chugoku Electric Power Co., Shikoku Electrical Power Co., Kyushu Electric Power, Electric Power Development Co., Japan Central Research Institute of Electric Power Industry and Clean Coal Power R&D Co. | Date: 2011-10-05
Provided is a ground flare in which a low-frequency vibration generated from a ground flare tower, such as a chimney, is properly adjusted to suppress it below a fixture-vibration generation limit, thereby preventing surrounding objects from resonating and vibrating. In a ground flare (10) that burns a flammable exhaust gas with a burner (11) at the lower end of a chimney, in which the lower end of the chimney (20) and the periphery of the burner (11) are surrounded by a windbreak (40), the low-frequency-noise sound pressure level of a ground flare tower composed of the chimney (20) and the windbreak (40) is reduced by selecting at least one of changing a natural frequency generated from the ground flare tower, using multiple ground flare towers, and installing a low-frequency-vibration absorber in the ground flare tower.
Mitsubishi Group, Clean Coal Power R&D Co., Hokkaido Electric Power Co., Tohoku Electric Power Co., Tokyo Electric Power Company, Chubu Electric Power Co., Hokuriku Electrical Power Company, Kansai Electric Power Co., Chugoku Electric Power Co., Shikoku Electrical Power Co., Kyushu Electric Power, Electric Power Development Co. and Japan Central Research Institute of Electric Power Industry | Date: 2011-06-15
It is possible to prevent a phenomenon by which the wall temperature of an outer cylinder rises abruptly as a layer of steam covers the inner circumferential surface of the outer cylinder and therefore decreases the heat transfer coefficient thereof, thus preventing a heat damage to the outer cylinder. Also prevented is burnout of the burner resulting from insufficient cooling due to variations in cooling efficiency at a leading end of the burner. A leading end located in a two-stage entrained-flow bed coal gasifier has a double-walled structure including an outer cylinder and an inner cylinder, and cooling water for cooling the leading end is supplied through an interior of the inner cylinder to cool the leading end and is then returned to a base end through a space formed between the outer cylinder and the inner cylinder. The space formed between the outer cylinder and the inner cylinder has a smaller channel area than the interior of the inner cylinder, and a swirling flow along a guide formed on an outer circumferential surface of the inner cylinder and a substantially linear flow in a longitudinal direction of the outer cylinder and the inner cylinder are applied to the cooling water returned to the base end through the space formed between the outer cylinder and the inner cylinder.
Mitsubishi Group, Hokkaido Electric Power Co., Tohoku Electric Power Co., Tokyo Electric Power Company, Chubu Electric Power Co., Hokuriku Electrical Power Company, Kansai Electric Power Co., Chugoku Electric Power Co., Shikoku Electrical Power Co., Kyushu Electric Power, Electric Power Development Co., Japan Central Research Institute of Electric Power Industry and Clean Coal Power R&D Co. | Date: 2012-07-25
A slag monitoring device 100 for a coal gasifier includes a slag hole camera 11 that observes a slag hole 3 from which molten slag flows out, a water surface camera 12 that observes a situation in which the slag flowing out from the slag hole 3 falls onto a water surface 5H of cooling water 5, a falling sound sensor 13 that observes a sound of the slag falling onto the water surface 5H, and a processing device 20 that determines a solidification and adhesion position of the slag based on an opening area of the slag hole 3 observed by the slag hole camera 11 and falling lines and falling positions of the slag observed by the water surface camera.
Ohira K.,Tohoku University |
Nakagomi K.,Tohoku University |
Takahashi N.,Hokkaido Electric Power Co.
Cryogenics | Year: 2011
Cryogenic slush fluids such as slush hydrogen and slush nitrogen are two-phase, single-component fluids containing solid particles in a liquid. Since their density and refrigerant capacity are greater than those of liquid-state fluid alone, there are high expectations for the use of slush fluids in various applications such as clean-energy fuels, spacecraft fuels for improved efficiency in transportation and storage, and as refrigerants for high-temperature superconducting equipment. Experimental tests were performed using slush nitrogen to obtain the flow and heat-transfer characteristics in two different types of horizontal circular pipes with inner diameters of 10 and 15 mm. One of the primary objectives for the study was to investigate the effect of pipe diameter on the pressure-drop reduction and heat-transfer deterioration of slush nitrogen according to changes in the pipe flow velocity, solid fraction and heat flux. In the case of an inner diameter of 15 mm, pressure drop was reduced and heat-transfer characteristics deteriorated when the pipe flow velocity was higher than 3.6 m/s. On the other hand, in the case of an inner diameter of 10 mm, pressure drop was reduced and heat-transfer characteristics deteriorated when the pipe flow velocity was higher than 2.0 m/s. From these results, it can be seen that a larger pipe diameter produces a higher onset velocity for reducing pressure drop and deteriorating heat-transfer characteristics. Furthermore, based on observations using a high-speed video camera, it was confirmed that pressure drop was reduced and heat-transfer characteristics deteriorated when the solid particles migrated to the center of the pipe and the flow pattern of the solid particles inside the pipe was pseudo-homogeneous. © 2011 Elsevier Ltd. All rights reserved.
Nakano D.,Japan Central Research Institute of Electric Power Industry |
Tsuno M.,Hokkaido Electric Power Co.
Limnology | Year: 2016
The macroinvertebrate assemblages in an artificial habitat, the settling basin of a hydroelectric power plant, were investigated and compared with those in a natural habitat, riffles in a nearby river. This study showed that macroinvertebrate density was much higher in the settling basin than in the riffles. Macroinvertebrate assemblage composition differed between the settling basin and the riffles. The difference was probably due to the widespread bryophyte beds in the settling basin. Cincticostella, Brachycentrus, Ephmerella, and chironomid midges, which are usually abundant in bryophyte beds, were present at much higher densities in the settling basin. Cheumatopsyche and Taeniopterygidae were also present at higher densities in the settling basin than in the natural riffles. In contrast, Epeorus was present at lower density in the settling basin than in the natural riffles. This study suggests that the settling basin increases β-diversity in riverine ecosystems. © 2016 The Japanese Society of Limnology
Akatsuka M.,Hokkaido University |
Hara R.,Hokkaido University |
Kita H.,Hokkaido University |
Ito T.,Meidensha |
And 2 more authors.
Conference Record of the IEEE Photovoltaic Specialists Conference | Year: 2010
Demonstration project named "Verification of Grid Stabilization with Large-scale PV Power Generation" has been conducted by the New Energy and Industrial Technology Development Organization (NEDO). In the Wakkanai PV power station, Sodium-Sulfur battery system is introduced to realize some additional functions. Since fluctuation in output of MW-class PV system may disturb the stable operation of power station, it is important to develop a fluctuation suppression technology. The authors have developed a fluctuation suppression using a battery system. In this paper, the relation between available battery capacity and fluctuation suppression performance is analyzed by computational simulation. This paper also estimates and discusses required battery capacity for fluctuation suppression. © 2010 IEEE.
Shimada S.,Hokkaido University |
Sakamoto T.,Hokkaido University |
Tsujino J.,Hokkaido Electric Power Co. |
Yamazaki I.,Hokkaido Sumiden Precision Industries LTD.
Surface and Coatings Technology | Year: 2010
Double-layer TiN/PSZ coatings approximately 2 μm thick were deposited on Si wafers and WC-Co cutting tools from Ti-, Zr-, and Y-alkoxide solutions by Ar/H2/N2 thermal plasma chemical vapor deposition with water functioning as an oxidant. A PSZ layer was deposited on TiN films upon oxidation of Zr- and Y-alkoxides by H2O using five-step-wise and pulse-type supply methods. The double-layer coatings were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM), in-depth glow discharge optical emission spectrometry, and cutting tests. Two H2O supply methods, two-stage pulse and five-step-wise supply methods, were shown to be suitable for the formation of the double-layer coatings by SEM and TEM observation of surface and cross-sectional microstructures. Cutting tests for the double-layer coatings deposited on WC-Co cutting tools prepared by the above two H2O supply methods were carried out to evaluate their wear resistance. © 2010 Elsevier B.V. All rights reserved.
Murakami C.,Hokkaido University |
Ishikuro Y.,Hokkaido Electric Power Co. |
Takahashi M.,Hokkaido University
BioMedical Engineering Online | Year: 2012
Background: The objective of our study was to develop a novel capacitive force sensor that enables simultaneous measurements of yaw torque around the pressure axis and normal force and shear forces at a single point for the purpose of elucidating pressure ulcer pathogenesis and establishing criteria for selection of cushions and mattresses.Methods: Two newly developed sensors (approximately 10 mm×10 mm×5 mm (10) and 20 mm×20 mm×5 mm (20)) were constructed from silicone gel and four upper and lower electrodes. The upper and lower electrodes had sixteen combinations that had the function as capacitors of parallel plate type. The full scale (FS) ranges of force/torque were defined as 0-1.5 N, -0.5-0.5 N and -1.5-1.5 N mm (10) and 0-8.7 N, -2.9-2.9 N and -16.8-16.8 N mm (20) in normal force, shear forces and yaw torque, respectively. The capacitances of sixteen capacitors were measured by an LCR meter (AC1V, 100 kHz) when displacements corresponding to four degrees of freedom (DOF) forces within FS ranges were applied to the sensor. The measurement was repeated three times in each displacement condition (10 only). Force/torque were calculated by corrected capacitance and were evaluated by comparison to theoretical values and standard normal force measured by an universal tester.Results: In measurements of capacitance, the coefficient of variation was 3.23% (10). The Maximum FS errors of estimated force/torque were less than or equal to 10.1 (10) and 16.4% (20), respectively. The standard normal forces were approximately 1.5 (10) and 9.4 N (20) when pressure displacements were 3 (10) and 2 mm (20), respectively. The estimated normal forces were approximately 1.5 (10) and 8.6 N (10) in the same condition.Conclusions: In this study, we developed a new four DOF force sensor for measurement of force/torque that occur between the skin and a mattress. In measurement of capacitance, the repeatability was good and it was confirmed that the sensor had characteristics that enabled the correction by linear approximation for adjustment of gain and offset. In estimation of forces/torque, we considered accuracy to be within an acceptable range. © 2012 Murakami et al.; licensee BioMed Central Ltd.
Iwasaki T.,Hokkaido Electric Power Co. |
Kato N.,Hokkaido Electric Power Co.
ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 | Year: 2014
This paper reports on the utilization of fly-ash cement as a material for dam foundation grouting. Kyogoku Dam, which is currently under construction at the confluence of Pepenai River and Bihinai River, which are tributaries in the Shiribetsu River system in Kyogoku Town, Hokkaido. Kyogoku Dam is a center core-type rockfill dam of 54 meters in height and with a crown length of 332.5 meters. Ordinary Portland cement or Portland blast-furnace slag cement class B is usually used as the material for dam foundation grouting, however, adoption of fly-ash cement has been examined in the case of Kyogoku Dam from the viewpoints of effectively utilizing byproducts and realizing economy. In conducting examination, testing was implemented in order to compare properties between fly-ash cement and Portland blast-furnace slag cement class B. As blending cases, four types of fly-ash cement were made by mixing in 20% and 30% of fly-ash (JIS II ash) with two types of differing fineness respectively to Ordinary Portland cement. Comparative testing was conducted on filling rate, flowability, bleeding rate and hardness index, which is an indicator of strength developability, et cetera. As a result of the test, because it was found that fly-ash cement has equivalent or better performance than Portland blast-furnace slag cement class B, fly-ash cement was used to conduct foundation grouting for Kyogoku Dam and the work on curtain grouting and blanket grouting was completed while satisfying the required improvement values. © 2014 by Japanese Committee for Rock Mechanics.
Kuwayama A.,Hokkaido Electric Power Co.
IEEJ Transactions on Power and Energy | Year: 2011
The mega-solar demonstration project named "Verification of Grid Stabilization with Large-scale PV Power Generation systems" had been completed in March 2011 at Wakkanai, the northernmost city of Japan. The major objectives of this project were to evaluate adverse impacts of large-scale PV power generation systems connected to the power grid and develop output control technologies with integrated battery storage system. This paper describes the outline and results of this project. These results show the effectiveness of battery storage system and also proposed output control methods for a large-scale PV system to ensure stable operation of power grids. NEDO, New Energy and Industrial Technology Development Organization of Japan conducted this project and HEPCO, Hokkaido Electric Power Co., Inc managed the overall project. © 2011 The Institute of Electrical Engineers of Japan.