RU2459173C2 - Flushing method for condenser with short-time return water flow - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: flushing method of condenser with short-time return water flow due to using the condenser filled with water, with supply water conduit, discharge water conduit with shutoff gate valve, of upper drain water chamber having a manhole. Return water flow in condenser if formed at the following performance of the operations: shutoff gate valve is closed on discharge water conduit, manhole is opened on upper drain water chamber, and when air supply through it to condenser is completed, manhole is closed and normal operation of condenser is restored.

EFFECT: invention allows creating short-time return water flow in condenser without preliminary emptying of condenser.

1 dwg

Description

The invention relates to the field of increasing the efficiency of the main equipment of thermal power plants and can be used for cleaning capacitors.

It is known that soft silty deposits and other rubbish are deposited on the condenser tubes, which are removed at large power plants by the Taprogge ball cleaning system, in which a cleaning element in the form of rubber balls with cooling water flows through the tubes to clean them. At the outlet of the condenser, they are caught and sent again to the input of the capacitor (all materials are in the Dzerzhinsky Research Institute of Electrical Engineering in Moscow). Small power plants and thermal power plants do not have mechanized cleaning at all, but are cleaned only at stops and empty.

Their disadvantages: 1) the inability to clean reinforced tubes with thickened walls and a reduced inner diameter; 2) in some peripheral tubes there is little water due to turbulence in the water chambers; 3) tubes into which the cleaning balls jam with fine debris.

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 USSR author's certificate No. 392319). Its disadvantage is the time for emptying the capacitor and additional devices.

The technical result of the invention is the creation of a short-term reverse flow of water in the condenser without first emptying the condenser, without installing additional devices.

The technical result is achieved by the method of washing the condenser with a short-term reverse flow of water through the use of a condenser filled with water, with a supply pipe, a discharge pipe with a shutter, and an upper drainage water chamber with a manhole. According to the invention, the reverse flow of water in the condenser is formed during the following operations: close the shut-off valve in the outlet conduit, open the manhole in the upper drainage water chamber, and at the end of the air inlet through the condenser, close the manhole and restore the condenser to normal operation.

The drawing shows a washing circuit of the condenser with a short-term reverse flow of water.

This method of flushing the condenser does not contain any additional devices, but only uses the available locking elements. For its implementation, the power for operation without a single condenser is installed on the turbogenerator (TG), the shutoff valve (1) on the outlet conduit closes, and in the presence of the usual discharge in the condenser siphon, the manhole (3) opens on the upper drain water chamber. At the end of the air inlet through the manhole (3) (5-10 seconds), the manhole (3) closes, 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 directly proportional to the difference in the levels of water in the condenser and the water level developed by the onshore pumps, and is inversely proportional to the hydrodynamic resistance of the condenser and the pressure pipe (4). This speed can be more than the working one, or maybe 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 water stream (like wool on a cat) and ruffled even at a low speed of the return water flow, and removes deposits from the walls of the tubes.

To open the manhole (3) it is necessary to have a stick-lever with a length of approximately 2 meters, which allows you to instantly open the manhole (3). Then a certain amount of water will be thrown out through the manhole (3). And you can open it slowly, within 1-3 seconds, but then there will be a slightly lower initial speed of the return flow, but there will be no ejection of water through the manhole.

It would be useful to mount a manhole on the upper horizontal sheet of the rear rotary water chamber over time. This would significantly increase the reverse flow rate.

The economic effect consists in increasing the vacuum in the condenser, increasing the power of the turbogenerator and increasing the efficiency.

Position 5 in the drawing indicates the level to which the water pumps raise the water.

Positions 6 and 7 indicate the driving conduits of other capacitors.

Claims (1)

The method of washing the condenser with a short-term reverse flow of water through the use of a condenser filled with water, with an inlet conduit, an outlet conduit with a shutoff valve, an upper drainage water chamber having a manhole, characterized in that the reverse flow of water in the condenser is formed during the following operations: close the shut-off valve on the outlet water conduit, open the manhole in the upper drainage water chamber, and at the end of the air inlet through it into the condenser, close the manhole and restore the norm full capacitor operation.