RU2484407C1 - Flushing method for condensers with short-time return water flow - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: flushing method of condensers with short-time return water flow involves an operating condenser filled with water, a supply water conduit having a shutoff gate valve and an operating forcing pump, an outlet water conduit having a shutoff gate valve, and an upper drain water chamber having a manhole hatch. Return water flow in the condenser is formed at performance of the following operations: shutoff gate valve is closed on an outlet water conduit, and after it is closed, the forcing pump on the supply water conduit is switched off. After the pump is stopped, the manhole hatch is opened on upper drain water chamber, and after the air suction through it to the condenser is completed, the manhole hatch is closed. Then, normal operation of the condenser and power of the turbine generator are restored. Such a method can be used at reduced power of the turbine generator for operation without any condenser.

EFFECT: at creation of short-time return water flow, soft and muddy deposits are washed off tubes of condensers; as a result, vacuum is improved in it and power of turbine generator increases.

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Description

The proposed method relates to the field of increasing the efficiency of the main equipment of thermal power plants and can be used to flush condenser tubes having an individual pressure pump in the inlet conduit.

It is known that soft silty deposits are deposited on condenser tubes, which are removed at large power plants by the Taprogge ball cleaning system, in which cleaning elements in the form of porous rubber balls with a diameter slightly larger than the inner diameter of the tubes go along with the cooling water through the tubes, cleaning them. At the exit from the condenser, they are caught and sent again to the input of the capacitor (all materials are in the VTS im. Dzerzhinsky in Moscow). Small power plants and thermal power plants do not have mechanized cleaning at all, and they are cleaned only at stopped and empty capacitors.

Ball cleaning systems have the following disadvantages: 1) the complexity and high cost of equipment and its operation; 2) the inability to clean reinforced tubes with thickened walls and a reduced inner diameter; 3) a little water enters some peripheral tubes due to its turbulence in the water chambers; cleaning balls do not get into them; 4) tubes in which the cleaning balls get stuck or jammed while entering the tube with small particles of litter that are not retained by the filters.

These disadvantages can be largely eliminated by the reverse flow of water in the condenser, which can be obtained using compressed air (as described in copyright certificate No. 392319). Its disadvantage: significant time for preliminary emptying of the capacitor and installation of additional devices.

The purpose of this proposal is to create a short-term reverse flow of water in the condenser without first emptying the condenser and without installing additional devices.

The technical result is achieved by the fact that in the method of washing the condensers with a short-term reverse flow of water, a working condenser filled with water is used, an inlet conduit having a shut-off valve and a working pressure pump, an outlet conduit having a shut-off valve, an upper drain water chamber having a manhole, and the return the water flow in the condenser is formed during the subsequent operations: the shut-off valve on the outlet conduit closes, after it is closed, the pressure pump on the inlet is turned off m water conduit after stopping it opens hatch on an upper drain water chamber, at the end of the air suction through the condenser manhole locked, normal operation is restored, and the capacitor capacity turbine generator.

This method of washing the condenser does not contain any additional devices, but uses only the available standard designs and locking elements.

The invention is illustrated by the drawing, where figure 1 shows a diagram of a device in which the proposed method for washing capacitors with a short-term reverse flow of water is implemented.

For its implementation, the power for operation without one condenser is reduced and installed on the turbogenerator (TG), the shutoff valve (1) on the outlet conduit closes, in the presence of a normal working discharge in the condenser siphon, the pressure pump 2 on the inlet conduit stops, after it stops, the hatch opens hole (3) on the upper drainage water chamber. At the end of the air inlet through the manhole (3) (5-10 seconds), the manhole (3) closes, the normal operation of the capacitor and the previous TG power level are restored.

The initial velocity of the return flow of water in the condenser is proportional to the difference in the levels of water in the condenser and the water of the reservoir (4), inversely proportional to the hydrodynamic resistance of the condenser, pressure head conduit and pump in the inlet conduit. This speed may be greater than the working one, or even less than the direct working speed in the condenser, but there will always be a positive result, since soft silty deposits are smoothed out by the working stream of water (like wool on a cat) and ruffled (loosened) even at a low reverse flow rate water, deposits are removed from the walls of the tubes.

The economic effect consists in increasing heat transfer in the tubes and vacuum in the condenser, increasing the power of the turbogenerator, i.e. increase in TG efficiency.

Claims (1)

The method of washing the condensers with a short-term reverse flow of water uses a working condenser filled with water, an inlet conduit having a shut-off valve and a working pressure pump, an outlet conduit having a shut-off valve, an upper drain water chamber having a manhole, characterized in that the reverse flow of water in the condenser is formed during subsequent operations: the shut-off valve on the outlet conduit closes, and, after its closure, the pressure pump on the inlet conduit is turned off, and, after its shutdown ovki opens manhole discharge water on the upper chamber, and at the end of the air suction through the condenser manhole locked, normal operation is restored, and the capacitor capacity turbine generator.

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