Showing papers on "Diffuser (sewage) published in 2009"

Real-time aeration efficiency monitoring in the activated sludge process and methods to reduce energy consumption and operating costs.

Abstract: Aeration is the most energy intensive unit operation in municipal wastewater treatment, and fine-pore diffusers have been widely used to minimize power consumption Unfortunately, fine-pore diffusers suffer from fouling and scaling problems, which cause a rapid decline in aeration performance and significant increase in power consumption Diffusers must be cleaned periodically to reduce energy costs The cleaning frequency of diffusers is site-specific and its effectiveness can be evaluated with oxygen transfer efficiency (OTE) testing Off-gas testing is the best technique for measuring OTE in real-time Fine-pore diffusers have low α factors that are further reduced at high loading rate A time-series of off-gas measurements were conducted to demonstrate the value of real-time OTE data for developing energy-conserving operating strategies The observations confirm the inverse correlation between OTE and airflow rate as well as the economic benefits of diffuser cleaning In addition, mathematic models were applied to simulate the transient oxygen uptake rate (OUR) and show the impact of varying load on OTE and aeration cost, especially when faced with time-of-day power rates Regular diffuser cleaning can reduce average power costs by 18% and various equalization alternatives can reduce power costs by 6 to 16% 1

Air inlet diffuser

Abstract: An air inlet diffuser 10 is disclosed for attachment relative to an air inlet opening 106 of an electronics enclosure 100 . The diffuser 10 extends into the electronics enclosure 100 and provides an increased surface area through which EMI attenuating apertures may be formed. The diffuser 10 also reduces the amount of structure that is disposed within the air inlet opening 106 thereby reducing impedance to airflow through the opening 106 into the enclosure 100 . The increased surface are of the diffuser 10 allows for increasing the number of EMI attenuating apertures that may be utilized for a given inlet opening 106 . In one embodiment, the total open area of the EMI apertures is greater than the open area of the air inlet opening. In such an embodiment, the EMI apertures provide low impedance to airflow through the diffuser 10 and increased airflow in conjunction with EMI attenuation may be realized.

Vorticity reducing cowling for a diffuser augmented wind turbine assembly

Abstract: A vorticity reducing cowling for a diffuser augmented wind turbine assembly is provided. The diffuser augmented wind turbine assembly includes a shroud, a wind turbine disposed within the shroud, and a diffuser coupled to an outlet of the shroud. The wind turbine includes a wind turbine housing and a plurality of blades rotatably disposed within the wind turbine housing, wherein the plurality of blades providing a swept area. The cowling comprises a body disposed upstream of the plurality of blades. The body includes an inlet end defining a first opening, the first opening having a first area. The body includes an outlet end defining a second opening, the second opening having a second area that is less that the first area. The second area is less than the swept area of the plurality of the blades.

Skylight collimator with multiple stages

Abstract: A non-specular skylight collimator has at least two axially successive collimator segments from top to bottom, with the segments becoming successively less flared from top to bottom. A skylight diffuser assembly typically covers the open end of the bottom segment.

A portable skin diagnosis device

Abstract: A portable skin diagnosis device (1)comprising: · a first measuring system comprising: · a diffuser; · an acquisition opening (5) for placing in front of the skin; · a lighting system that is placed behind the diffuser so as to illuminate the skin in the acquisition opening (5) via the diffuser; and · an optical detector that receives the light reflected by the skin placed in the acquisition opening; and · a second measuring system that is configured to take a measurement on the skin in a manner that is not optical.

A diffuser apparatus in a turbomachine

Abstract: A diffuser apparatus in a turbomachine is provided comprising a diffuser structure and stabilizing structure. The diffuser structure includes inner and outer walls defining a flow passageway through which gases flow and diffuse such that kinetic energy is reduced and pressure is increased in the gases as they move through the passageway. The stabilizing structure stabilizes a separated gas recirculation zone.

Adjustable centrifugal type compressor

Abstract: The utility model discloses an adjustable centrifugal type compressor comprising an impeller, a vane diffuser and a vaneless diffuser, the vaneless diffuser is positioned between the vane diffuser and the impeller, the vaneless diffuser is connected with the movable control part and can move under the control of the movable control part to enable the width of the vaneless diffuser to be adjustable, the vane diffuser and the vaneless diffuser are composed to a mixed type diffuser; an air inlet of the impeller is communicated with an air entry of the compressor, an air outlet of the impeller is communicated with the vane diffuser by the vaneless diffuser. The utility model has the advantages of the vane diffuser and the vaneless diffuser, the width of the adjustable vaneless diffuser can be adjusted, different operating condition requirements of the compressor can be adapted, so that the compressor can operate with high-efficiency under the design operating condition and the part loading operating condition, meanwhile, the generations of the air shock loss and the surge can be avoided effectively, the compressing performance can be improved.

Inlet wind suppressor assembly

Abstract: A diffuser augmented wind turbine assembly comprising an inlet wind suppressor and a shroud disposed within said inlet wind suppressor. The assembly contains a wind turbine; the wind turbine is disposed within the shroud; and the shroud is connected to a diffuser.

Systems and apparatus relating to compressor stator blades and diffusers in turbine engines

Abstract: A row of stator blades in a compressor of a combustion turbine engine, the combustion turbine engine including a diffuser located downstream of the compressor, and the row of stator blades disposed in close proximity to the diffuser; the row of stator blades comprising: a plurality of stator blades that include at least one of an inboard forward notch and an outboard forward notch.

Light-emitting diode tube structure

Abstract: The present invention relates to a light-emitting diode (LED) tube structure, which comprises a lamp cover and a light-emitting assembly. The light-emitting assembly is disposed under the lamp cover; and a condenser film or a diffuser film is disposed above the light-emitting assembly. By using the condenser film or the diffuser film, the light emitted by LEDs can be condensed or diffused for using.

Method and Apparatus for Quantification of Optical Properties of Superficial Volumes Using Small Source-to-Detector Separations

Abstract: A probe for obtaining quantitative optical properties and chromophore concentrations of tissue components in tissue in-vivo at superficial depths and at source-detector separations of 5 mm or less includes a source fiber providing light to expose the tissue, a diffuser layer into which light from the source fiber is directed and then from the diffuser layer to and/or into the tissue, and a detector fiber arranged relative to the diffuser layer for detecting backscattered and/or reflected light returned from the tissue without transmission through the diffuser layer.

Liquid aeration apparatus and wastewater treatment method

Abstract: A liquid aeration apparatus includes a vessel having sidewalls, a closed bottom end and, a liquid outlet being provided at or near the upper end. The sidewalls define a cross-sectional interior open area with a vertical depth. An air diffuser is positioned within the interior open area of the vessel . A liquid intake conduit is positioned with an inlet end located at or near the upper end of the vessel and an outlet located near the bottom end of the vessel.

Wind turbine with di ffuser

Abstract: Wind turbine especially for the built environment, comprising a diffuser which has both a flow augmenting function and a sound damping function. Optionally the diffuser is provided with an integrated noise damper which is located essentially in the range of the blade tips. In a preferred embodiment of the invention the diameter of the outflow opening of the diffuser is about 8% larger than the diameter of the inflow opening.

Air Bag Module with T-Diffuser for Inflator

Abstract: A diffuser ( 50 ) for use in an air bag system, the diffuser comprising: a connector part ( 52 ) configured to be connected to an air bag inflator, the connector part including a side wall ( 53 ); and a gas distribution part formed as an integral extension of the connector part and configured to deliver gas from the connector part to the air bag ( 150 ), and the distribution part including a first conduit ( 60 ) and a second conduit ( 70 ), the two conduits configured to give the diffuser a low profile.

Soil And Water Remediation System And Method

Abstract: Method for treating contaminants at a site, especially a deep well site, includes delivering a first stream of a first gas to a first port of a laminar microporous diffuser and delivering a second stream of a second gas to a second port of the laminar microporous diffuser to effect mixing of the first and second streams of gases within the laminar microporous diffuser.

Centrifugal Pump with Segmented Diffuser

Abstract: A centrifugal pump (2) with a volute (12) and at least one stage with an associated impeller (4) and removable diffuser assembly (14) comprises: multiple diffuser segments (16), each diffuser segment comprising a central passage (18) from an inner curvilinear surface (20) to an outer curvilinear surface (22) and a curvilinear leading engagement surface (28) between a leading end of its curvilinear inner surface and its curvilinear outer surface; multiple curvilinear volute mounting surfaces (26) within the volute, each curvilinear mounting surface receiving a corresponding diffuser segment to mount the diffuser segments in a generally annular pattern about the impeller to form the removable diffuser assembly, with the curvilinear inner surface of each diffuser segment proximate an outer periphery of the impeller and the curvilinear leading engagement surface (28) of each diffuser segment engaging a trailing portion of the curvilinear outer surface (22) of an adjacent one of the diffuser segments; and a volute connecting passage (30) within the volute for coupling the central passages of each diffuser segment to a pump outlet (32).

Performance Evaluation of A Stratified Chilled- Water Thermal Storage System

Abstract: In countries with hot climates, air-conditioning forms a large proportion of annual peak electrical demand, requiring expansion of power plants to meet the peak demand, which goes unused most of the time. Use of well-designed cool storage can offset the peak demand to a large extent. In this study, an air conditioning system with naturally stratified storage tank was designed, constructed and tested. A new type of diffuser was designed and used in this study. Factors that influence the performance of chilled water storage tanks were investigated. The results indicated that stratified storage tank consistently stratified well without any physical barrier. Investigation also showed that storage efficiency decreased with increasing flow rate due to increased mixing of warm and chilled water. Diffuser design and layout primarily affected the mixing near the inlet diffuser and the extent of this mixing had primary influence on the shape of the thermocline. The heat conduction through tank walls and through the thermocline caused widening of mixed volume. Thermal efficiency of stratified storage tanks was as high as 90 percent, which indicates that stratified tanks can effectively be used as a load management technique. Keywords—Cool Thermal Storage, Diffuser, Natural Stratification, Efficiency Improvement, Load management.

Flat bag for a vacuum cleaner

Abstract: The flat bag has a bag upper side and bag lower side, whose bag walls are formed from an air permeable filter material, where an inlet opening is introduced in the bag top for the air to be filtered. A diffuser forming an intermediate level is arranged in the interior of the flat bag between the bag upper side and bag lower side, which comprises two single material strips or flat material structures, which have elongated flow openings. The diffuser is connected to a side of the bag wall.

A domestic appliance with an integral transparent or translucent wall portion

Abstract: A domestic appliance (1) includes a housing or wall (6) and a wall portion (8). The portion is an integral part of the housing (6). The appliance has a display means (2) comprising a light source (10), a mask (2) and a diffuser (4). The housing (6) may be smoothly shaped to obtain an appealing design. A separate or standardized display may be perceived as a disruption of a smooth design of the appliance. To incorporate the display means (20) into the design the integral wall portion (8) is transparent and positioned between the diffuser (4) and the mask (2). An inner face of the wall portion (8) is directed to the mask (2). An outer face of the wall portion (8) is directed to the diffuser (4). A diffusing layer (32) included in the diffuser (4) is provided on the outer face of the integral wall portion (8).

Active bezel edge lighting with diffuser layer

Abstract: A bezel for a TV display has two or more bezel elements, one being more diffusive of light from a source juxtaposed with the bezel assembly than the other element. One element can laterally border the other element or one element can be directly behind the other. More than two bezel elements may be used.

Diffusing plate and directly-down back light module unit with the diffusing plate

Abstract: The utility model discloses a diffuser plate and a downright type backlight module group which comprises the diffuser plate, wherein a sensitive surface of the diffuser plate and a position corresponding to an LED lamp source are equipped with an outward bulgy cone, when beam which is emitted from the LED lamp source is irradiated through the cone, the beam can be refracted in a large angle, which leads the light speed not to be over centralized, thereby reducing or eliminating the light spot phenomenon of the diffuser plate.

Membrane unit for having diffuser pipe integrated membrane frame structure and section pipe integrated membrane module

Abstract: PURPOSE: A membrane unit having a diffuser pipe integrated membrane frame structure and a suction pipe integrated membrane module are provided to increase processing efficiency, and to prevent a diffuser nozzle from clogging. CONSTITUTION: A membrane unit(100) having a diffuser pipe integrated membrane frame structure and a suction pipe integrated membrane module includes a main frame structure, a plurality of membrane module(120), and a filtering pipe. A diffuser line connection hole connected with a diffuser line is formed on the top of the main frame structure. The differ line is connected with a blower(101), and the membrane module is fixed inside a main frame(110) vertically. A filtering line connection hole is formed on the top of the filtering pipe. The filtering line discharges processed water through a filtering pump(105).

A3 Subscale Rocket Hot Fire Testing

Abstract: This paper gives a description of the methodology and results of J2-X Subscale Simulator (JSS) hot fire testing supporting the A3 Subscale Diffuser Test (SDT) project at the E3 test facility at Stennis Space Center, MS (SSC). The A3 subscale diffuser is a geometrically accurate scale model of the A3 altitude simulating rocket test facility. This paper focuses on the methods used to operate the facility and obtain the data to support the aerodynamic verification of the A3 rocket diffuser design and experimental data quantifying the heat flux throughout the facility. The JSS was operated at both 80% and 100% power levels and at gimbal angle from 0 to 7 degrees to verify the simulated altitude produced by the rocket-rocket diffuser combination. This was done with various secondary GN purge loads to quantify the pumping performance of the rocket diffuser. Also, special tests were conducted to obtain detailed heat flux measurements in the rocket diffuser at various gimbal angles and in the facility elbow where the flow turns from vertical to horizontal upstream of the 2nd stage steam ejector.

Amplification circuit for driving a diffuser

Abstract: An amplification circuit for driving an audio signal diffuser that includes a generation circuit of a first pre-charging signal, the generation circuit including an amplifier provided with an input terminal for receiving the first pre-charging signal and provided with an output terminal for providing a second pre-charging signal as a function of the first pre-charging signal, and a decoupling capacitor of the amplifier from the diffuser, the capacitor connected to the output terminal for charging by the second pre-charging signal

Method and device for detecting leaks in an underground liquid pipe, particularly a water pipe

Abstract: The invention relates to a method for detecting leaks in an underground liquid pipe (T), particularly a water pipe, into which a gas is fed through a diffuser (8) into the liquid of the pipe, the atmospheric content of the gas being low; and the path of the pipe is traced along the pipe surface with a detection system for measuring at consecutive points the content of the air in the injected gas, an abnormally high content constituting a leak indicator. A diffuser (8) is selected having outlet pores for the gas, the mean diameter of which is less than 50 µm so as to produce gas bubbles, the diameter of which is small.

Steam injection heater with stationary end seal assembly

Abstract: A direct contact steam injection heater that includes a steam diffuser having a plurality of steam diffusion holes that are selectively exposed by a regulating member to control the amount of steam used to heat a liquid. The regulating member is movable within the steam diffuser and the steam diffuser includes a seating member to prevent the flow of steam from the diffuser when the regulating member is in a completely closed, seated position. At least one sealing members selectively exposes the steam diffusion holes in the discharge region of the steam diffuser when the regulating member moves between the open and closed positions. The spacing of the steam diffusion holes along the steam diffuser can be varied depending upon the desired resolution of the steam released as the regulating member moves between its fully closed and fully open position.