The way to protect trash lattice icing

 

(57) Abstract:

The invention relates to methods of combating ice problems on the intake of hydraulic structures. The invention allows to prevent the primary phase of solidification of the sludge in the area of depression in the hydrodynamic shadow of the grille. In the end part of the hollow rod serves liquid working medium under pressure and with a speed that creates the entraining effect of the discharge and transport the sludge from the terminals of the lattice. In the result, there is no need of heating rods of the lattice.

The invention relates to the field of hydraulic engineering construction and relates, in particular, ways of dealing with ice problems at water intakes.

There is a method of protection cerodinium gratings driving inland water ice with electric heating, in particular, the most used method windshield heating ( see Pejovich A. I. Heating trash grates HPP water intake structures", L: Gosenergoizdat, 1959, 18C.).

However, as a means of preventing the crystallization of supercooled water grids, and also sticking to them floating in the stream of sludge, however, cannot protect the grill from the mechanical and preliminary heating is switched on ( before as water has overcooled).

The method of heating time-consuming due to the exact choice of heating mode, the effective power including efficiency, the complexity of the installation of heaters. Optimum efficiency in practice could not be reached.

For the prototype accepted closest in physical sense way to protect cerodinium gratings hydroelectric power stations, including the supply of the working environment inside the rods of the lattice under pressure and release it in the frontal part of the rods.with. N 81604, IPC EO 5/08, 1948), which is the closest analogue to the proposed method.

In the prototype, the distinctive feature of the proposed lattice is the fulfillment of the tubular rods it from a porous material or perforation filling the internal cavity of the rods salt solution (working environment), which seeps on the outer surface of the pipe grid, wets them and this prevents the adhesion of sludge to the grid.

The known method does not solve the problem of pressure drop in the zone at the tail (end) portions of the rods and, consequently, the occurrence of germ primary crystallization at a temperature different from the usual crystallization.

The method in the prototype does not lead to sustainability of the rods R it (crystallization) completely. In addition, it is possible clogging of the pores of the sediments brine, corrosion elements cerodinium lattices, all of which lowers the strength and stability of rods.

The purpose of the invention prevent the initial phase crystallization in the area of depression in the hydrodynamic shadow of the grille.

To achieve the goal of water inside ( the end part) of the hollow rod serves under pressure, and the release by the frontal part of the rod in the area of depression thread, with a speed that allows you to relieve pressure and exercise electroysis effect for the demolition of the already formed sludge.

The method is as follows.

8 hollow rod (in the area of the exhaustion produce "blowing out" of the water jet to change the hydraulics of flow of the rods of the lattice water stream. The rod has a slotted hole in the leaf and its parts. Water supply in the rarefaction zone changes the amount of pressure between the rod has electroysis effect and allows you to remove the crystallization of the sludge. The rate of flow of the thread on the end surfaces of the rods of the grids is maintained equal to the velocity of the main flow, which is included in misterjaw space lattices.

Studies pokaza, in winter conditions it is possible to remove the crystallization of the sludge and to transport it from the grids.

The way to protect trash lattice icing, including the supply of pressure liquid working medium inside the rods of the lattice and release it in the frontal part of the rod, characterized in that the working environment is additionally produced from the rear of the rods, and as the working environment using the water, and the water output from terminals perform with speed, providing the removal of sludge from the lattice due to ejection.

 

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