Ebara Environmental Plant Co.

Tokyo, Japan

Ebara Environmental Plant Co.

Tokyo, Japan

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Patent
Ebara Environmental Plant Co. | Date: 2017-02-01

A heat transfer tube, for a fluidized-bed boiler, having a protector which has sufficient durability in a corrosive wear environment, while reducing an initial cost by avoiding a complex structure, considering maintainability such as installation and replacement, and lowering a risk of crack or deformation is disclosed. The heat transfer tube 1 for use in a fluidized bed of a fluidized-bed boiler includes a water tube 2 through which a fluid flows, a thin protector 4, a thick protector 3 made of casting which are provided at an outer circumferential side of the water tube 2 and are configured to protect the water tube 2, a heat-insulating layer 6 provided between the water tube 2 and the thin protector 4, and a fixing jig 5. The fixing jig 5 is fixed to the thick protector 3 to cause the fixing jig 5 to hold the thin protector 4 provided at the outer circumferential side of the water tube 2.


Chen J.,Chubu University | Ninomiya Y.,Chubu University | Naganuma H.,Tohoku Electric Power Co. | Sasaki Y.,Tohoku Electric Power Co. | And 5 more authors.
Fuel Processing Technology | Year: 2016

Protective surface treatment via several kinds of cost-effective thermal spraying alternate materials was developed and investigated in this study for heat exchanger tubes in waste incinerators with quite aggressive environment. Different thermal spraying materials including Fusible Ni-SA-a, Fusible Ni-SA-b, Fusible Ni-SA-c, NiCr-TS and NiCr-WEL were investigated to evaluate their performance of corrosion resistance. Three corrosion tests including high-temperature wettability test, long-term adhesion force experiment and hot corrosion test were performed, respectively. As has been proven from experimental results, the specimen coated with Fusible Ni-SA-c exhibited high contact angles in both air and simulated flue gas condition, which indicated a low ash wettability and liquid-bridge force. The coatings of Fusible Ni-SA-c and Fusible Ni-SA-b resulted in quite low adhesion force between ash and specimen, illustrating their good performance to improve the tube corrosion resistance. Besides, the weight losses of specimens coated with Fusible Ni-SA-c and Fusible Ni-SA-b due to corrosion by ash were noticeably decreased, in particular Fusible Ni-SA-c caused almost zero corrosion. Fusible Ni-SA-c decreased the amount of ash deposition on the tube surface of SUS304 by 35%. These corrosion tests supported Fusible Ni-SA-c as thermal spraying material with excellent corrosion resistance, which is able to prevent the heat transfer surface from high-temperature corrosion and thus enhance the service-life of the tube. Furthermore, among these corrosion tests, it was found that the high-temperature wettability test is an effective approach to evaluate the performance of different corrosion-resistant materials. © 2015 Elsevier B.V.


Galetz M.C.,Dechema Institute | Bauer J.T.,Dechema Institute | Schutze M.,Dechema Institute | Noguchi M.,Ebara Corporation | And 2 more authors.
Materials and Corrosion | Year: 2014

Previous laboratory studies reported in the literature and field experience have revealed the accelerating effect of the heavy metals lead and zinc on the corrosion behaviour of materials used in waste incineration plants. The major problem is that heavy metal containing chloride and sulphate salts usually have relatively low melting points, often below the metal temperature of the boiler surfaces. While the negative influence of lead and zinc is well-known, copper is another heavy metal that can occur in high amounts of up to 2000 mg/kg in refuse-derived fuel, which is the fuel produced by shredding and dehydrating solid municipal waste that is burned in modern waste-to-energy plants. The impact of copper additions on the corrosion behaviour of one iron-based austenitic alloy 1.4952 and three nickel-based alloys 2.4856 (alloy 625), 2.4633 (alloy 602 CA), 2.4605 (alloy 59), which are often used in waste incineration plants was investigated. The results of these studies clearly show the strong corrosive effect of copper content in salt mixtures on the corrosion of steels and nickel-based alloys. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Galetz M.C.,Dechema Institute | Bauer J.T.,Dechema Institute | Schutze M.,Dechema Institute | Noguchi M.,Ebara Corporation | Cho H.,Ebara Environmental Plant Co.
Journal of Thermal Spray Technology | Year: 2013

The accelerating effect of heavy metal compounds on the corrosive attack of boiler components like superheaters poses a severe problem in modern waste-to-energy plants (WTPs). Coatings are a possible solution to protect cheap, low alloyed steel substrates from heavy metal chloride and sulfate salts, which have a relatively low melting point. These salts dissolve many alloys, and therefore often are the limiting factor as far as the lifetime of superheater tubes is concerned. In this work the corrosion performance under artificial salt deposits of different coatings, manufactured by overlay welding, thermal spraying of self-fluxing as well as conventional systems was investigated. The results of our studies clearly demonstrate the importance of alloying elements such as molybdenum or silicon. Additionally, the coatings have to be dense and of a certain thickness in order to resist the corrosive attack under these severe conditions. © 2013 ASM International.


De Dieu Mugiraneza J.,University of Ryukyus | Miyahira T.,Ebara Environmental Plant Co. | Sakamoto A.,Sanken Electric Co. | Cheny Y.,University of Ryukyus | And 3 more authors.
Japanese Journal of Applied Physics | Year: 2010

The microcrystalline phase obtained by adopting a two-step rapid thermal annealing (RTA) process for rf-sputtered silicon films deposited on thermally durable glass was characterized. The optical properties, surface morphology, and internal stress of the annealed Si films are investigated. As the thermally durable glass substrate allows heating of the deposited films at high temperatures, micro-polycrystalline silicon (micro-poly-Si) films of uniform grain size with a smooth surface and a low internal stress could be obtained after annealing at 750 °C. The thermal stress in the Si films was 100 times lower than that found in the films deposited on conventional glass. Uniform grains with an average grain size of 30nm were observed by transmission electron microscopy (TEM) in the films annealed at 800 °C. These micro-poly-Si films have potential application for fabrication of uniform and reliable thin film transistors (TFTs) for large scale active-matrix organic light emitting diode (AMOLED) displays. © 2010 The Japan Society of Applied Physics.


Patent
Ebara Environmental Plant Co. | Date: 2014-07-16

The present invention relates to a fluidized bed furnace in which by forming a fixed-bed adjacent to a fluidized-bed, wastes are moved together with a fluidized medium onto the fixed-bed by utilizing a splashing action of the fluidized medium in an upper portion of the fluidized-bed, thereby allowing a reaction such as drying and pyrolysis of the wastes to proceed slowly with time, and thus the wastes can be dried and pyrolyzed slowly in the entire furnace. The fluidized bed furnace includes a base plate (30) disposed at a bottom portion of a furnace body (10) and having gas supply ports for supplying a fluidizing gas to fluidize the fluidized medium, and a fluidized bed (20) formed on the base plate (30) in the furnace body (10) to take the wastes into the fluidized medium and pyrolyze the wastes. The fluidized bed (20) has the fixed-bed (23) where the fluidized medium is kept in a resting state, and the fluidized-bed (22), formed adjacent to the fixed-bed (23), where the fluidized medium is fluidized.


Patent
Ebara Environmental Plant Co. | Date: 2015-05-27

The present invention relates to a method for treating wastes and a waste incinerator, and more particularly to a method for treating wastes and a waste incinerator for performing incineration treatment of wastes such as municipal wastes, shredder dust, and waste plastics. In the method for treating wastes by incinerating the wastes with an incinerator (1), the method for treating wastes includes combusting part of wastes at a primary air ratio ranging from 0.3 to 0.8 to generate a combustible gas, and supplying secondary combustion air to the generated combustible gas and spraying water in the generated combustible gas to perform secondary combustion of the combustible gas in the presence of water.


Patent
Ebara Environmental Plant Co. | Date: 2015-10-21

Provided is a swirling type fluidized bed furnace capable of supplying a moving layer with an appropriate air quantity without providing a moving-layer pipe with a flow meter or a damper. A swirling type fluidized bed furnace 10 of the present invention includes a furnace body 11, a moving bed plate 32a supporting a moving layer 22, a first fluidized bed plate 34a and a second fluidized bed plate 36a supporting a fluidized layer 24, a roots blower 60 supplying the moving layer 22 with gas, and a turbo blower 40 supplying the fluidized layer 24 with gas, wherein the roots blower 60 is a volumetric air blower (60).


Patent
Ebara Environmental Plant Co. | Date: 2015-01-07

The present invention relates to an immersed heat transfer tube installed in a fluidized bed of a fluidized-bed boiler for recovering combustion heat generated when a fuel such as RDF (refuse derived fuel) with high calorific value containing biomass and plastics, or wastes is combusted. An immersed heat transfer tube (5) which is installed in a fluidized bed (3) of a fluidized-bed boiler (1) includes a water tube (6) through which a fluid flows, a cylindrical protector (8) provided at an outer circumferential side of the water tube (6) and configured to protect the water tube (6), and a packed bed (7) provided between the water tube (6) and the protector (8).


Patent
Ebara Environmental Plant Co. | Date: 2013-09-25

The present invention relates to a fluidized bed furnace and a method for treating wastes, which are capable of continuously performing appropriate treatment of wastes that are liable to cause unstable combustion. The fluidized bed furnace (1) includes a moving-bed (21) for pyrolyzing wastes into a pyrolysis residue while moving the wastes downwardly, a fluidized-bed (22) for combusting part of the pyrolysis residue, a moving-bed gas supply means (50), a fluidized-bed gas supply means (60), a moving-bed temperature detector (31), a fluidized-bed temperature detector (32), and a controller (80). The controller (80) performs a control process for supplying the fluidized-bed (22) with a fluidized-bed gas (A2) at a flow rate for causing the temperature of the fluidized-bed (22) to be a predetermined temperature and supplying the moving-bed (21) with a moving-bed gas (A1) at a flow rate for causing the temperature of the moving-bed (21) to be lower than the temperature of the fluidized-bed (22) by a predetermined temperature.

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