Descaling system for the cooling tubes of a steam condenser

Claim 2

A descaling system for cleaning the inner walls of the cooling water tubes of a steam condenser by a plurality of sponge balls which comprises a cooling water feed pipe connected to the inlet side of the cooling water tubes to supply cooling water thereto; a cooling water discharge pipe connected to the outlet side of the cooling water tubes to drain off cooling water therefrom; a sponge ball collector provided on the discharge pipe; a sponge ball circulation passageway connected at one end to the cooling water feed pipe and at the other end to the collector, the circulation passageway containing a sponge ball circulation pump and a sponge ball reservoir; a sponge ball water-soaking vessel for receiving a plurality of sponge balls to soak them with cooling water; an inlet valve for the watersoaking vessel so as to supply cooling water thereto from the sponge ball circulation passageway or stopping the supply; an outlet valve for the water-soaking vessEl so as to drain off cooling water and the sponge balls contained therein to the circulation passageway or shutting off the passage of the cooling water and sponge balls; an evacuating device connected to the water-soaking vessel for holding sponge balls to deaerate its interior, thereby attaining evacuation to a prescribed vacuum level, wherein, when the sponge ball water-soaking vessel is evacuated to a prescribed vacuum level by the evacuating device, the inlet valve of the sponge ball water-soaking vessel is opened to lead cooling water thereinto from the sponge ball circulation passageway, thereby soaking the sponge balls received in the water-soaking vessel with cooling water.

Claim 3

A descaling system according to claim 1, wherein a wire net is mounted on part of the upper surface of the sponge ball water-soaking vessel to prevent sponge balls received therein from being thrown outside; a float valve is provided on the wire net; and the water-soaking vessel is connected to the evacuating device through the wire net and float valve.

Claim 4

A descaling system according to claim 1, wherein the evacuating device comprises a first deaeration pipe having one end connected to the sponge ball water-soaking vessel and the other end divided into two branches; a deaeration valve provided on one of the branches of the first deaeration pipe to cause, when opened, the interior of the water-soaking vessel to connect with the atmosphere; a cooling water separator positioned on the other branch of the first deaeration pipe to separate cooling water from air; a second deaeration pipe connected at one end to the cooling water separator; a filter provided in the second deaeration pipe to eliminate misty cooling water contained in the air transferred from the cooling water separator to the second deaeration pipe; a deaeration means located in the second deaeration pipe behind the filter; and a deaeration valve fitted to either or both of the other branch of the first deaeration pipe and the second deaeration pipe.

Claim 5

A descaling system for cleaning the inner walls of the cooling water tubes of a steam condenser by a plurality of sponge balls which comprises a cooling water feed pipe connected to the inlet side of the cooling water tubes to supply cooling water thereto; a cooling water discharge pipe connected to the outlet side of the cooling water tubes to drain off cooling water therefrom; a sponge ball collector fitted to the discharge pipe; a sponge ball circulation passageway connected at one end to the cooling water feed pipe and at the other end to the sponge ball collector, said circulation passageway containing a sponge ball circulation pump and reservoir; a sponge ball water-soaking vessel for receiving a plurality of sponge balls to soak them with cooling water; a soaking vessel inlet pipe for connecting the inlet side of the soaking vessel to the circulation passageway; a soaking vessel outlet pipe for connecting the outlet side of the soaking vessel to the circulation passageway; an inlet valve fitted to the soaking vessel inlet pipe; an outlet valve provided on the soaking vessel outlet pipe; and evacuating device connected to the water-soaking vessel for holding sponge balls to deaerate the interior of the water-soaking vessel for evacuation, wherein, when the interior of the water soaking vessel is evacuated to a prescribed vacuum level by the evacuating device, the inlet valve of the water-soaking vessel is opened to lead cooling water thereinto from the sponge ball circulation passageway through the inlet pipe of the water-soaking vessel to soak the sponge balls with cooling water; and when the sponge balls are fully filled with water, the outlet valve of the water-soaking vessel is opened to transfer all the sponge balls to the circulation passageway through the outlet pipe of the water-soaking vessel.

Claim 6

A descaling system for cleaning the inner walls of the cooling water tubes of a steam condenser by a plurality of sponge balls which comprises a cooling water feed pipe connected to the inlet side of the cooling water tubes to supply cooling water thereto; a cooling water discharge pipe connected to the outlet side of the cooling water tubes to drain off cooling water therefrom; a sponge ball collector fitted to the discharge pipe; a sponge ball circulation passageway connected at one end to the cooling water feed pipe and at the other end to the sponge ball collector, said circulation passageway containing a sponge ball circulation pump and reservoir; a sponge ball water-soaking vessel for receiving a plurality of sponge balls to soak them with cooling water; a soaking vessel inlet pipe for connecting the inlet side of the soaking vessel to the circulation passageway; a soaking vessel outlet pipe for connecting the outlet side of the soaking vessel to the circulation passageway; an inlet valve fitted to the soaking vessel inlet pipe; an outlet valve provided on the soaking vessel outlet pipe; and evacuating device connected to the water-soaking vessel for holding sponge balls to deaerate the interior of the water-soaking vessel for evacuation, wherein, when the interior of the water soaking vessel is evacuated to a prescribed vacuum level by the evacuating device, the inlet valve of the water-soaking vessel is opened to lead cooling water thereinto from the sponge ball circulation passageway through the inlet pipe of the water-soaking vessel to soak the sponge balls with cooling water; and when the sponge balls are fully filled with water, the outlet valve of the water-soaking vessel is opened to transfer all the sponge balls to the circulation passageway through the outlet pipe of the water-soaking vessel.