Technologies

Market leading technologies coupled with the highest quality services

Ebara Engineering Review No.252

Under the Scenes of our Lives
High-pressure Pump-CO2 Injection Pump-

The CO2 injection pump plays an active role as a part of the Enhanced Oil Recovery (EOR) process that injects carbon dioxide (CO2) into the oil layer and recovers crude oil efficiently. When this process is performed, carbon dioxide, which is collected from emitted gas at energy production or other industries, is utilized in some cases. There is high expectation for this oil recovery process because it can also serve as a carbon capture and storage (CCS) process for preventing the release of large quantities of carbon dioxide into the atmosphere. This article introduces the roles and characteristics of the CO2 injection pump as an application example of a high-pressure pump.

Large-capacity, Ultrahigh-efficiency, High-pressure Pumps for Seawater RO Desalination Delivered to Carlsbad Desalination Plant in the U.S.

We delivered four units of the large-capacity, ultrahigh-efficiency, high-pressure pump to the Seawater Reverse Osmosis (SWRO) Carlsbad Desalination Plant located in California State, U.S.A. The pump provides the world’s highest level of efficiency as a high-pressure pump for the market of SWRO desalination. To achieve ultrahigh efficiency, we successfully reduced flow passage losses by reviewing the flow passage geometry of the conventional models based on a combination of morphing technology and flow analysis. In addition, we reduced leakage losses by narrowing gaps in the running clearances such as the wear rings.

Keywords

Seawater high pressure pump, Desalination plant, Reverse Osmosis, Ultrahigh efficiency, Axially split multistage pump, Morphing technology, Unsteady flow analysis, SWRO, CFD

Fluid Coupling for Boiler Feed Pump

At the time when global warming is becoming a serious issue requiring our efforts to reduce CO2 emission, various industrial plants are confronted with a challenge of how they can reduce operation power consumption of turbo machinery. Since reduction in the operation power cost itself is an important issue from the viewpoint of corporate management, those plants are required to improve the operation efficiency. As one solution to these issues, control of rotating speed of turbo machinery became popular, and now, many plants use fluid couplings. In this paper we explain operation principles of fluid couplings and the structure and features of the fluid coupling for electric motor driven boiler feed pumps as an example of large capacity, high speed fluid couplings used for high pressure pumps.

Keywords

Fluid coupling, Boiler feed pump, High pressure pump, Carbon dioxide emission reduction, Rotating speed control, Impeller, Runner, Scoop tube, Electro-hydraulic servo mechanism

Historical Perspective on Pump Fluids Engineering Technology
-Response to Receiving the “Fluid Machinery Design Award”
from the ASME Fluids Engineering Division-

To mark receiving the “Fluid Machinery Design Award” from the ASME Fluids Engineering Division, advances in experimental, numerical, and design technologies for fluid machinery over the last 40 years are reviewed based on the author’s experience. Advances include pressure probe measurements downstream from a rotating impeller, multi-color oil-film flow visualization of complex secondary flows, various levels of CFD technology, 3D inverse design method for logically controlling internal flows, multi-objective optimizations for controlling performance curves, and adjoint method for optimizing complex 3D configurations. Future prospects are also discussed.

Keywords

Tow-hole Pitot probe, Multi-color oil-film flow visualization, Computational Fluid Dynamics, Inverse design method, Numerical optimization, Multi-objective optimization, Adjoint method

Lecture on Fundamental Aspects of High Temperature Corrosion and Corrosion Protection
Preface to the Lecture on High Temperature Corrosion and Corrosion Protection

Lecture on Fundamental Aspects of High Temperature Corrosion and Corrosion Protection
Part 1: Basic Theory

Starting from this issue, we will provide “Lecture on fundamental aspects of high temperature corrosion and corrosion protection” through a series in six parts. The series will describe corrosion protection engineering that we developed using our actual equipment, starting from basic aspects of high temperature corrosion. In this issue, a basic theory of high temperature corrosion is described. High temperature corrosion is subject to thermodynamics and diffusion phenomena in solids. The parabolic rate law can be considered as the most important law. Since corrosion develops while substances move inside the corrosion product (scale), the corrosion rate is inversely proportional to the thickness of the scale. In other words, because the corrosion product plays a role in corrosion prevention, forming a scale having a high corrosion protection effect is critical to successful corrosion protection. Influential factors for the formation of a scale are outlined here.

Keywords

High temperature corrosion, High temperature oxidation, Parabolic rate law, Wagner’s theory, Dissociation pressure, EIlingham diagram, Diffusion in solids, Oxide scale

Lecture on Fundamental Aspects of High Temperature Corrosion and Corrosion Protection
Part 2: Corrosion Protection and Coatings

As the 2nd issue of the “Lecture on fundamental aspects of high temperature corrosion and corrosion protection”, this paper outlines the basic approach for preventing corrosion at high temperature, and the use of coatings as a corrosion protection measure. Maintaining high-temperature corrosion resistance requires stable formation and maintenance of a protective oxide scale on the surface of an alloy. As material factors having a large impact on the formation and maintenance of a protective oxide scale, the paper discusses adhesiveness of oxide scales as well as composition and structure of the alloy, taking stainless steel as an example. As environmental factors, it discusses the influence of gas atmosphere, temperature, and gas flow. Lastly the paper describes diffusion coating and thermal spraying as coating methods popularly used for environmental and energy devices or systems.

Keywords

High temperature corrosion, High temperature oxidation, Corrosion protection, Coatings, Diffusion coating, Thermal spraying, Oxide scale, Heat-resistant alloy, Microstructure, Rare earth element

Model EVMS Vertical Multistage Pumps for the Global Market

As key products for the global market, new model EVMS stainless vertical multi-stage pumps have been released. This model can be used in a wide range of applications including industrial water, cold and hot water circulation, boiler feed, drinking water feed for building facilities, and water purification equipment. Thanks to the unique shape of its impeller main shroud, the model greatly reduces axial thrust force and can be used with standard motors, which have no special bearings for high axial thrust force. In addition, the model offers increased compatibility with a variety of pipe connections so that it can be connected to various kinds of piping.

Keywords

Vertical, Multistage, Stainless, Impeller, Thrust force, Axial force, Bearing, Motor, Efficiency, Connection, Unique shape

Reconstruction of Nukata Drainage Pump Station of the Musashi Canal
(Outline of the Reconstruction Work and Verification of CFD Analysis)

The Nukata Drainage Pump Station is located at the end of the Musashi Canal which flows through Gyoda City and Konosu City in Saitama Prefecture. To reconstruct the deteriorated Pump Station, Pump Station No. 1 and Pump Station No. 2 were integrated, the drainage capacity was increased, and construction and civil engineering work for seismic retrofitting was done; the operation of the reconstructed pump station was officially commenced in March 2016. Based on Ebara’s technologies for pump-related facilities, we successfully completed the four-and-half-year work, including the reconstruction of mechanical and electrical facilities, the implementation of countermeasures against vortices, and civil engineering work for seismic retrofitting, while maintaining the pump station’s drainage capacity. For flow patterns in the pump sump including the upstream balancing reservoir, the results of computational fluid dynamics (CFD) analysis and the results of the conducted test were compared and verified; vortex suppression devices studied by CFD analysis are found to be efficient enough for practical use.

Keywords

Reconstruction, Drainage pump station, Vertical shaft mixed flow pump, Changeover, Seismic retrofitting, Pump sump, Balancing reservoir, CFD analysis, Countermeasures against vortices, Field test

Report on Delivery and Operational Condition of Grate-type (Stoker-type) Incinerator with Advanced Flue Gas Treatment System in China -Nanjing City, Jiangsu Province-

Ebara’s grate-type incinerators with a treatment capacity of 2000 t/d (500 t/24 h×4 lines) were delivered to Nanjing City, Jiangsu China, and their performance test was completed in March 2016. Ebara Environmental Plant Co., Ltd. and Ebara Qingdao Co., Ltd, have already delivered incinerators to seven facilities in China: fluidized-bed incinerators to two facilities and grate-type incinerators to five. Three of them have been reported in past issues of the Ebara Engineering Review. This paper reports on the delivery of incinerators to the eighth facility in China, the plant capacity of which is the largest among the eight facilities.
In China, there is a need for ever-more-sophisticated waste incineration technology; in 2014, the relevant national standard of China was revised, and more stringent emission regulation of waste incineration plants were imposed. This paper reports the operating conditions, performance test results, etc., of the sophisticated flue gas treatment facility to meet the more stringent emission regulation.

Keywords

China, Nanjing, Municipal solid waste, Grate-type incinerator, EGR, SCR, Sodium bicarbonate injection

Construction of Municipal Waste Treatment Plant
“Clean Plaza Yokote”

On March 30, 2016, the Clean Plaza Yokote, a new integrated waste treatment plant, which we delivered in Yokote in Akita Prefecture, was completed. This plant consists of a heat recovery facility and a recycle center. The heat recovery facility uses our latest and proven system, EBARA HPCC21 stoker, to allow operation at a low air ratio of 1.3 or less, and the boiler steam conditions with high-temperature and high-pressure (4 MPa × 400 °C), which is the highest level for facilities of this scale in Japan. As a result, the gross power generation efficiency has been significantly improved to reach to as high as approximately 20%. We confirmed that the recycle center can recover iron and aluminum at high purity of over 98%. The plant also uses natural energy proactively with a solar power system, and a snow storage chamber that stores snow in winter and uses it for air conditioning in summer. Another important feature of the plant is that it stores necessary stockpiles and secures sufficient space so that it can work as a logistic support center during disasters.

Keywords

Municipal waste, Grate-type incinerator, Incineration plant, Environment, Recycle, Low air ratio combustion, Dioxins, Gross power generation efficiency