|
|
 |
| Sediment Sensors for Hydro Power |
Sediment (Silt) Monitoring for Turbine Erosion Prevention in Run of River Hydro Power Plants Using LISST-Infinite-100X
[ for
the August 26, 2005 New Delhi Workshop establishing the South Asia
Interagency Sediment Technology Committee, SAISTC, please click here ]
 Shown without protective cover.
In
run of river power plants, severe erosion of turbine parts can occur
due to sediments carried by rivers, despite the presence of desiltation
chambers. The problem is severe in powerplants that are sited in the
steep terrains typified by the Himalayan topography. Turbine, valves
etc. can suffer severe erosion if the size of suspended sediment grains
is large. Convention has it that grains >200 microns cause the most
severe damage. As a result, often desiltation efficiency is described
in terms of the removal of such large grains. In fact, there is no
sharp cut-off in size below which grains may cause no turbine erosion.
Thus, a measurement of the full size distribution of suspended
sediments is needed at all times.
The erosion of turbines in Hydro Power plants is known to be a severe
problem in rivers that drain the Himalayas - covering India, China,
Nepal, Bhutan and other countries of East Asia. In Europe, power plants in Switzerland and Norway also are subjet to such
erosion and wear.
SEQUOIA SCIENTIFIC, INC. has developed the world's first instrument system geared to
the automated at-site MONITORING of the suspended sediment size distribution
and concentration. Using our basic laser diffraction technology in
combination with an auto-dilution system, the concentration and size
distribution can be routinely and continuously monitored. The
following capabilities are offered:
- Measurement of size distribution and concentration;
- Size Distribution reports concentration in 32 log-spaced size
classes covering the size range from 2.5 to 500 microns (contact us for
custom situations);
- Control Room display of history and current data on a dedicated computer;
- Systems can be programmed to set off alarms at user-selected thresholds in user-selected size classes;
- Data can be archived, archived and hard-wired, or archived and telemetered to a remote site via RF or satellite links.
The system consists
of a LISST-100X with a LISST-Infinite auto-dilution attachment.
The user must provide power and clean filtered water. The
LISST-Infinite-100X monitors the sediment properties on a user selected
schedule. When the concentration exceeds a factory pre-set
threshold, the LISST-Infinite performs a dilution step before
making measurement of concentration and size distribution. Additional
automatic dilution step may be performed if needed (rare).
Typically, below about 2,000 ppm (precise number depends on sediment
size) no dilution is required. In this case, data can be acquired
frequently at intervals of a few seconds (user selected). When dilution
is required, the dilution step slows down sampling interval to a
minimum of 2 minutes between samples.
SEQUOIA is pleased to offer a complete turn-key solution from
installation to data display and alarm settings (but not including
civil works). For more information or price quotes, please contact us.
|
|
|  | | |  | |  |  |
JFIC2010
Las Vegas, NV, 27-29 June 2010, booth 207
9th annual StormCon
San Antonio, TX, 2-4 August 2010, booth 421
Ocean Optics XX
Anchorage, AK, 25 September - 1 October 2010
CASQA
CA, 1-3 November
PiE 2010
Villefranche-sur-Mer, France, 15-17 November
| | |
|
|