CANADIAN PowerPlus CORPORATION
This document is a description of Canadian PowerPlus Corporation. It is not an offer for sale.
Canadian PowerPlus Corporation is sole owner of a technology protected globally under Patent Pending which will assist owner/operators of hydro electricity generation from dammed impound systems to improve output. With this technology, a hydro-electric generation facility can attain the largest, most reliable, and sustainable output of renewable electrical energy with maximum cost effectiveness and minimal environmental disturbance.
Description of the Technology
The most common way to generate electricity is by storing water behind a dam, guiding it through draft tubes (pipes) into turbines near the bottom of the stored water body inside or next to the dam. Above the turbine, mounted on the same shaft around which the turbine rotates sits the generator which, naturally, turns at the same Rotations Per Minute (RPMs).
The falling height of the water in the draft tubes (called "net effective head ") along with the volume create pressure on the turbine blades causing them to rotate. Once the water has passed through the turbine more than 90% of its energy has been transferred into rotation. The "energy spent water " falls into the tail race draft tube below the turbine and flows back into the river immediately downstream from the dam, called the " downstream tail race ". The exit of this tail race draft tube is usually several meters below the water level in the downstream tail race.
The slower moving waters in the downstream tail race cause" back pressure" on the bottom end of the vertical water column, the net effective head. The net effective head is directly proportional to the power generated. It is very costly, and unpopular, to increase the "net effective head" upward as this would require increasing the height of the dam and flooding more land. However, the increase could occur on the bottom of the "net effective head ", namely, by excavating the "downstream tail race"
The idea of increasing power production by excavating the downstream tail race is known and practised on occasion. Thus, the "net effective head" is extended downward by x%. Since the power output is directly proportional to the "net effective head," it is, therefore, also increased by the same x%. Traditionally, the excavation stops before the draft tube exit could be exposed to air at low water flow. These low water flow conditions happen infrequently.
Exposure to air could cause "cavitation". Cavitation is a physical phenomenon where water droplets on the turbine blades "implode" because of the speed and remove microscopic amounts of metal. The loss of metal will, eventually, cause imbalance and damaging vibration. Therefore, cavitation must be avoided under all circumstances. If the downstream tail race is to be excavated further, below the cavitation point, a variable flow impediment, an "adjustable weir," has to be introduced which is activated when low flow conditions could expose the draft tube exit to air. These adjustable weirs could have many different configurations. Reliability of operation and ease of maintenance must determine the choice along with degree of installation difficulty and cost.
The combination of excavation below the cavitation level for increased power generation with an adjustable weir to safe guard against cavitation is the idea behind the patent application.
Ideal candidates for this improvement are low-head, high-flow-volume impoundment systems because even shallow excavations can result in a significant percentage increase in the net effective head. Wherever a downstream tail race shows white water in the flow pattern, the river bottom declines rapidly. This indicates that optimal net effective head gain can be achieved without excavating over a long distance.
10 impounded (stored/ dammed) water body|
15 total head
20 bottom or base of impounded water body
22 natural river bed downstream of dam
22a excavated river bottom in tail race area close to toe of dam
22b natural or artificial ledge (excavated material) (i.e. Gordon Shrum Dam)
22c ledge removed
25 normal tail race water level
31 toe of dam
32 toe key|
40 stand pipe (intake)
42 intake aperture
44 base of stand pipe
50 bladder (inflatable)
Figure 1: shows the dam with excavated river bottom and artificial ledge to keep water table high enough in tail race in order to prevent cavitation.
Figure 1 full size (jpg)
Figure 1 full size (tif)
Figure 2: shows the ledge removed thus lowering the water table at low flow below cavitation point.
Figure 2 full size (jpg)
Figure 2 full size (tif))
Figure 3: shows a deflated bladder downstream in the tail race section of the river at medium to high flow. There is no danger of cavitation.
Figure 3 full size (jpg)
Figure 3 full size (tif))
Figure 4: shows an inflated bladder, tethered, can be in series at low flow. The water table in the tail race is held sufficiently high to prevent cavitation. There are several options for variable regulating devices.
Figure 4 full size (jpg)
Figure 4 full size (tif))
Canadian PowerPlus Corporation is looking for opportunities to implement its patent-pending technology to enhance the electric output of new and upgraded hydro-electric generation facilities around the world. Each project will be conducted by a separate corporate entity. PowerPlus Pilot 1, Inc, will be the corporate entity in charge of the first pilot project and licensed by - but independent from Canadian PowerPlus Corporation. This first pilot will be a prototype installation which will allow us to document and showcase the benefits of this practical and beneficial new technology.
Canadian PowerPlus Corporation has successfully completed the first round of financing. The company is actively seeking a hydro-electric generation partner for its first pilot project. The will a be a small to medium dam in British Columbia where a small project to lower the tailrace contour and install adjustable weirs to raise water levels during low flow conditions will result in a significant increase in power output.
For further information, contact
Hans-Christian Behm, CEO