Suction pipe unit

 

(57) Abstract:

The invention relates to the construction of hydropower and can be used in the construction of hydropower plants and pumped storage power plants. Suction pipe unit includes camera impeller, cone, knee and outlet diffuser. Above the outlet diffuser is optional bypass cavity connected to the outlet of the diffuser by means of an intermediate tube, which in terms are staggered and placed between the secondary bypass cavity and a rectilinear section of the ceiling area of the discharge diffuser. The output part of the ceiling of the discharge cone is made in the form of a curved section. Under the action of pressure drop water from downstream for additional bypass cavity falls into the ceiling area of the discharge diffuser, which reduces separation of the water flow from the ceiling of the suction pipe and reduces the pressure pulsations. The invention increases the reliability and durability of the suction pipe. 2 Il.

The invention relates to the field of hydropower construction and can be used in the construction of hydropower plants and gerakkan Tadashi diffuser. In addition, in order to reduce hydraulic losses, it is provided with an additional outlet diffuser located in a plane at an angle 0o< < 180oto the axis of the main diffuser (see RF patent N 2033496, CL E 02 B 9/00, publ. 20.04.95. Bull. N 11). [1].

For reasons that impede the achievement of specified following technical result when using the known device is that the known device is very material-intensive design, because it is necessary to increase the consumption of expensive material for the construction of an additional outlet of the diffuser, and it will significantly increase the cost of the entire draft tube. In addition, this construction will result in increased hydraulic pressure losses of energy due to the significant increase in the total length of the discharge diffuser.

The closest device to the same destination to the invention by the combination of features is the suction pipe of the unit containing the cone with knee and attached outlet diffuser, and the diffuser has a rectangular cross-section and is equipped with a movable sectional ceiling, consisting of pivotally interconnected sections, (see ed. mon. USSR N nel decreases the consumption of the whole structure, consequently, its cost. In addition, during operation of the hydraulic unit in the turbine mode, the mobile sections of the ceiling are in the lower position, and when turning on the unit in pumping mode section of the ceiling go up, thus achieved the most beneficial shape of the ceiling of the suction pipe in both modes of operation of the unit.

For reasons that impede the achievement of specified following technical result when using the known device, taken as a prototype, is that the known device comprises a movable elements as pivotally interconnected sections, which during operation of the suction tubes reduce the reliability of the whole structure. In addition, there is a likelihood of failure of the movable panels of the ceiling, which will lead to a sharp deterioration in the hydraulic regime of the discharge flow and increased losses.

The invention consists in the following.

The proposed construction of the suction pipe of the unit allows to solve the problem of increasing the reliability and durability of the suction pipe, and will also reduce the amount of expensive material, greatly sarracenia efficiency of hydropower.

Technical result: the cost of materials for the manufacture and reducing the cost of construction on 2 - 3%; increase the reliability and durability of the suction pipe; reduction of failures and downtime for repairs; reduced flow velocities at the end of the discharge cone due to this increase in demand and the number of generated electricity. In addition, the possible reduction of hydraulic losses in the suction pipe by eliminating the separation of the water flow from its walls and reducing pressure pulsations in the pipe wall.

This technical result in the implementation of the invention is achieved in that the suction pipe unit including the camera impeller, cone, knee and outlet diffuser, equipped with an additional bypass cavity located above the discharge cone, and intermediate tubes, which in terms are staggered and placed between the additional bypass cavity and a rectilinear section of the ceiling area of the discharge cone, and the output part of the ceiling of the discharge cone is made in the form of a curved segment.

The positive effect from the use of the invention in water supply (pressure drop) of the downstream additional bypass cavity and intermediate tubes in the ceiling area of the cone draft tube. Moreover, for the uniform receipt and distribution of water in the zone of the possible isolation of the intermediate tube in the plan are staggered. All this allows to reduce hydraulic losses and to ensure the integrity of the passing water flow in the suction pipe, as well as to reduce the flow velocity at the end of the discharge cone by increasing the area of the output section. In addition, the water supply into the ceiling area will reduce pressure pulsations and further increase the reliability of the suction pipe.

In Fig. 1 shows a longitudinal section of the suction pipe unit of Fig. 2 - suction pipe unit under the plan.

The suction tube includes camera of the impeller 1, the cone 2, shank 3 and outlet diffuser 4. The suction pipe is provided with an additional bypass cavity 5, which is connected with the discharge cone 4 by means of an intermediate tube 6.

The suction pipe of the hydraulic unit operates as follows. The flow of water after the chamber of the impeller 1, sequentially passing through the cone 2, shank 3 and outlet diffuser 4, falls on the tail part of the outlet of the diffuser 4. Under the action of pressure difference in the it low atmospheric pressure). This reduces the separation of the water flow from the ceiling of the suction pipe and reduces the pressure pulsations.

The proposed solution suction pipe contains no moving, dynamic elements, thereby increasing reliability and durability of the whole structure during operation. Further, the device additional bypass cavity will cause the thread will not break away from the walls, as this will significantly increase hydraulic and hydrodynamic qualities of the suction pipe. In addition, the design will significantly reduce the consumption of expensive materials for its manufacture, and consequently, reduce its cost. The reduction of flow velocities at the end of the discharge diffuser will result in increased capacity and the amount of produced electricity.

The expected benefits from the implementation of this framework is as follows.

1) the effect of the decrease of failures and downtime for repairs.

When hydroelectric power N = 2300 MW and reducing repair time t for 2 weeks or 672 hours per year, the number of generated electricity will increase during this time, the value of

E = N t,

E = 2300000 672 = 1545600000 kWh

If the value is = 309120000 R. per year.

2) the effect of the decrease of the flow velocity to the end of the discharge cone.

By reducing the speed of the outflowing stream of water with V1= 2.4 m/s to V2= 2.0 m/s the difference between the pressure losses will be

h = (V21-V22)/2g

h = 1,1(2,42-2,02)/29,81 = 0,1 m

When the flow is Q = 500 m3/s, the expected effect on the increase in capacity will be

N = gnQh,

N = 9,81 0,9 500,0 0,1 = 441,45 kW.

Taking the number of hours of use of installed capacity in year tN= 2500 hours per year, the number of generated electricity will increase even further by the value of

ESS= N tN,

ESS= 441,45 2500 = 1103625 kWh

If the cost of 1 kWh is equal to 20 kopecks, the expected effect of the increase of electricity will be

S = 1103625 0,2 = 220725 times a year.

Sources of information

1. The patent of Russian Federation N 2033496, CL E 02 B 9/00, published 20.04.95. Bull. N 11. // Of the suction pipe of the unit.

2. The copyright certificate. USSR N 1402700, CL F 03 B 11/00, published 15.06.88. Bull. N 22. //Vsasyvauschie-suction pipe of the reversible unit.

Suction pipe unit camera including RA the cavity, above the outlet of the diffuser, and the intermediate tubes, which in terms are staggered and placed between the additional bypass cavity and a rectilinear section of the ceiling area of the discharge cone, and the output part of the ceiling of the discharge cone is made in the form of a curved section.

 

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SUBSTANCE: method involves supplying water stream free of young fish in waterway; forming hydraulic screen near water-intake influence area to separate above area from main stream of water-intake structure; forming whirlpool area near water-intake shore edge. Water stream is formed upstream water-intake structure. Water for users is taken from whirlpool area formed by inner water spray boundary and shore edge. Facility includes water-intake structure arranged at shore line, water-intake pipes connected with pump, stream former and means for water stream creation in waterway. Means for water stream creation is made as channel operating in non-pressure regime and having outlet part arranged upstream water inlet. Marks formed on channel bottom and waterway bottom coincide one with another. Stream former is located downstream water intake and directed in downstream direction.

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SUBSTANCE: invention relates to hydraulic works designed for preventing getting of young fish into diversion facilities. Proposed device contains fish retaining shield made in form of hollow guides arranged in tiers across water channels in depth with displacement of each upper tier towards diversion channel. It contains also perforated air duct located on bottom of water channel directly before said shield and train-and-fish trough arranged in upper part of channel in parallel with air duct and connected with outlet and device to let out young fish arranged in height of fish retaining shield. Guides of U-shaped are installed at angle to current of intake channel, their planes are perforated and open end part is pointed to bottom of water channel. Young fish let out device is made in form of perforated shields installed side guides for vertical displacement by drive in height of fish retaining shield relative to additional guides made from side of bank edges of intake channel. Perforation holes of shields and u-shaped guides do not coincide in light.

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24 cl, 18 dwg

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