RU2060786C1 - Apparatus for steam turbine condenser cooling water purification - Google Patents

Abstract

FIELD: cooling systems with biological pollution of vegetable origin. SUBSTANCE: apparatus for steam turbine condenser cooling water purification has mechanical gauze 1 made in the form of closed belt, composed of sieves; and washing mechanism 7 located over water stream on rear side of gauze. Opposite washing mechanism on front side of gauze there is additionally located on pendulum-type suspension 8 cylindrical brush 9 rigidly fixed on shaft 10, on ends of which there are freely mounted detaching disks 11. In the case brush 9 is contacting gauze along whole its width and is capable to rotate around axis in direction, that is opposite to direction of gauze movement in point of contact. EFFECT: increased productivity. 2 dwg

Description

 The invention relates to the purification of liquids, in particular to the purification of cooling water of steam turbine condensers from biological contaminants of plant origin.

A device for cleaning cooling water of a condenser of a steam turbine, including a rotating grid made in the form of a moving closed tape that overlaps the inlet windows of the water intake and consisting of sieves with cells. A stream of water seeps through the mesh cells, and the debris deposited on the surface rises with a rotating mesh to a flushing device, which is a series of nozzles [1]
This device contains the following essential features similar to the essential features of the invention: a mechanical mesh made with the possibility of movement; mesh made in the form of a closed tape consisting of sieves; a flushing device installed above the water flow from the back of the net.

 The disadvantage of this device is the low cleaning efficiency of cooling water. This is due to the fact that it is impossible to remove long filamentous algae, peat residues that clog the net, forming strong plexuses that cannot be destroyed by pressure jets using a washing device.

 Closest to the proposed technical essence is a device for cleaning liquid [2] comprising filtering material in the form of an endless closed tape located above the liquid level, a cleaning device installed on one side of the tape, and a brush opposite the cleaning device on the other side of the tape in contact with the surface of the tape over its entire width.

 The disadvantage of this device is the low efficiency of water purification from biological contaminants of plant origin, which clog the moving belt. This is due to the design of the brush, which makes it impossible to remove algae and peat residues.

 The objective of the invention is to increase the efficiency of water purification.

 The task becomes feasible with better cleaning of the moving tape, which is achieved by the proposed design of the brush.

 The technical result of the invention is achieved due to the following essential features of the invention.

 Signs similar to the prototype. A device for cleaning water, such as cooling water of a condenser, includes an endless closed tape in the form of a mechanical grid consisting of sieves. Above the water flow, opposite to each other, on opposite sides of the mesh tape, a cleaning device made in the form of a flushing device from a number of nozzles and a brush in contact with the surface of the tape along its entire width are installed.

 Features distinctive from the prototype. The brush is made in the form of two half-cylinders rigidly mounted on the shaft with squeezing discs freely set at its ends, the brush mounted on a pendulum suspension with the possibility of rotation around the axis in the direction opposite to the movement of the tape at the point of contact with the brush.

 All these signs are significant, as they are in a causal relationship with the achieved technical result, i.e. affect the efficiency of cleaning the cooling water of the condenser. So, thanks to the pendulum suspension and squeezing disks, the technical solution is workable, since a rotating shaft with a hard brush mounted on it is pressed out by metal corners and passes another mesh section with the subsequent mechanical contact of this section with the brush. In addition, the presence of a pendulum suspension creates the necessary contact force between the brush and the contaminated cleaned tape-net, which affects the quality of its cleaning. Introduction to the design of squeezing discs prevents breakage of the pile by the corners periodically passing by the brush, which also contributes to better brush cleaning of the mesh. The execution of the brush with the possibility of rotation around the axis in the direction opposite to the movement of the mesh at the contact point also improves the cleaning efficiency of the mesh, since then the relative speed between the moving mesh and the brush bristles that clean off the dirt increases.

 In FIG. 1 schematically shows a device for cleaning cooling water of a steam turbine condenser; in FIG. 2 cylindrical brush with shaft and squeezing discs, longitudinal section.

 The device contains a mechanical mesh 1 made of two parallel sleeve-roller chains 2, tensioned on the drive 3 and supporting 4 gear sprockets with the possibility of rotation. The chains are rigidly interconnected by transverse metal corners 5, forming sections into which mesh frames with cells from 2 x 2 to 4 x 4 mm are inserted. The mesh 1 is lowered into the intake channel 6 perpendicular to the flow of cooling water. In the place of exit of the mesh from the water above the intake channel, a flushing device 7 is installed in the form of a series of nozzles from the rear of the mesh. Opposite the flushing device, a cylindrical brush 9 is fixed to the pendulum suspension 8 on the pendulum suspension 8, it is rigidly mounted on the shaft 10, at the ends of which the squeezing discs 11 are freely placed. The brush 9 is made in contact with the surface of the mesh 1 over its entire width and with the possibility of rotation around the axis in the direction opposite to the movement of the grid 1 at the point of contact.

 The brush 9 is made of half-cylinders 12 connected by couplings 13 and equipped with a nylon pile 14 with a length of 100-150 mm and a diameter of 0.8-1 mm.

 A device for water purification works as follows.

 When the electric motor is turned on, gear sprockets 3 and 4 begin to rotate, which drive the mesh 1. Passing through the intake channel 6, the mesh picks up debris that rises with it to the nozzle 7, the jets of which partially clean the mesh. At the same time, opposite the nozzle, debris that has solidly clogged into the mesh cells, for example algae, is scraped off by a brush 9, which rotates in the opposite direction with respect to the mesh 1. When the protruding parts of the metal corners 5 approach the brush 9, the latter moves away from the mesh, since the corners 5, coming into contact with the squeezing discs 11, they reject the brush 9, mounted on a pendulum suspension 8. After passing through the corner 5, the brush returns to its working position, i.e. the latter comes in contact with the next contaminated section of the grid 1 and carries out its cleaning up to the approach of the next metal corner. The process is then repeated.

Claims (1)

 A device for cleaning a liquid, for example, cooling water of a steam turbine condenser, including an endless closed tape, a cleaning device installed above the water stream on one side of the tape, and a brush opposite the cleaning device on the other side of the tape, contacting the surface of the tape over its entire width, characterized in that the brush is made in the form of two half-cylinders rigidly mounted on the shaft with squeezing discs freely set at its ends, while the brush is mounted on a pendulum suspension with the possibility of rotation tions around the axis in the opposite direction to the tape in contact with the brush.

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