JPS6257919B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cleaning ball water treatment device that is used by being incorporated into a cleaning device system in order to make the cleaning device attached to a shell-and-tube heat exchanger work effectively.

Shell-and-tube heat exchangers, especially condensers and coolers that use seawater as cooling water, may contain aquatic organisms, etc. on the inner surface of the heat transfer tubes.
It is unavoidable that limescale etc. will accumulate and the heat transfer efficiency will deteriorate over time. Therefore, it is necessary for such a heat exchanger to have a means for cleaning the inner surface of the tubes, and a cleaning device is generally attached to the heat exchanger. In this case, it is advantageous for plant operation that the cleaning equipment can perform cleaning work while the heat exchanger continues to operate.
A suitable number of spherical cleaning bodies (hereinafter referred to as cleaning balls) are circulated together with cooling water. So-called ball cleaning devices are widely used.

This ball cleaning device is usually automated so that it can be operated at any time according to the plant operation, and a typical example is one that is built into the cooling water system of the condenser of a power generation plant. It is.

However, in this type of automated ball cleaning device, the cleaning balls introduced into the circulation path are used repeatedly without being replaced midway through, but the cleaning balls are made of porous rubber, synthetic resin, etc. Since the specific gravity of the cleaning balls used is set to be approximately equal to that of the cooling water, the following problems will occur during operation if those that have been insufficiently treated to contain water are used. That is, first, if the cleaning ball contains air inside, the specific gravity is smaller than that of the cooling water by the volume occupied by the air, so the water level is the highest in the water chamber on the inlet side of the condenser. The cleaning ball will float up from the cooling water and become unrecoverable.Secondly, if there is a relatively small amount of air contained inside, floating can be avoided, but if a large amount of air is mixed in, As a result, these lightened cleaning balls are unevenly distributed and guided to the heat transfer tubes in the upper part of the heat exchanger.

If this reduction in the absolute amount of cleaning balls and their uneven distribution are left unaddressed, the cleaning effect of the heat transfer tubes will be impaired accordingly, while the cleaning balls that have remained in the circulation path will flow out together with the cooling water on other occasions, causing seawater contamination. It can also be the cause of

Therefore, in order to deal with these inconveniences, it is necessary to carefully treat each cleaning ball with water before introducing it into the circulation path, but currently these treatments cannot be done manually. Due to economic constraints, it is almost impossible to process thousands of cleaning balls into a uniform state due to the dependence of the washing balls, and a more effective solution has long been sought. It was requested.

The present invention has been made based on the above-mentioned circumstances, and is a cleaning ball hydration treatment that can significantly contribute to improving the cleaning effect of heat exchanger tubes and improving the ball recovery rate by obtaining cleaning balls that have been uniformly hydrated. The purpose is to provide equipment.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a heat exchanger, for example, a condenser 1, and a water intake source are connected by a cooling water intake pipe 2, and a discharge end is connected by a cooling water discharge pipe 3, respectively. One end of a communication pipe 6 is connected to this cooling water intake pipe 2 before reaching the condenser 1, and the other end is connected to a cooling water discharge pipe 3 immediately after leaving the condenser 1.
Further, a first ball injection device 4 is provided at the communication portion of the communication pipe 6 with the cooling water intake pipe 1, and a ball collection device 5 is provided at the communication portion with the cooling water discharge pipe 3. Along with this, a circulation pump 7 is provided on the upstream side of the communication pipe 6, and a ball recovery device 8 is provided on the downstream side.

In addition to the above-mentioned configurations, the present invention is provided with a ball circulation device that guides the cleaning balls extracted from the ball recovery device 8 to the inlet side of the circulation pump 7.

Here, the ball circulation device includes a circulation conduit 12 that is branched from the downstream path of the ball collection device 8 and whose other end is connected to the upstream path of the ball collection device 5, and this circulation conduit 12 communicates with the communication pipe 6. A three-way valve 10 is provided at a position where the circulating conduit 12 communicates with the cooling water discharge pipe 3.

Next, the operation will be explained.

When a power generation plant is operated continuously for a certain period of time, the heat transfer tubes of the condenser 1 gradually become contaminated with water organisms, limescale, and the like. Since the heat transfer efficiency of the condenser 1 gradually begins to deteriorate during this process, it becomes necessary to operate the ball cleaning device at a certain stage. The cleaning balls used in the ball cleaning device contain a large amount of air when they are not in use, so the cleaning balls are subjected to a moisture treatment prior to operation of the ball cleaning device. The procedure is to first connect the three-way valve 10 to the ball recovery device 8 and the second
It is operated in the direction of communicating with the ball injection device 11, and the inlet valve 9 is brought into the "open" state. When the circulation pump 7 is operated in this state, the cooling water is guided from the cooling water discharge pipe 3 to the ball recovery device 8, and the cleaning balls in the vessel are contained in the cooling water. At this time, when the recovery valve of the ball recovery device 8 is fully opened, the cleaning balls are sent together with the cooling water to the circulation conduit 12 via the three-way valve 10, and then sent out from the second ball injection device 11 to the cooling water discharge pipe 3. Here, the cleaning balls are once scattered in a large amount of cooling water flowing down from the condenser 1, but the entire amount is captured by the ball collecting device 5 and extracted by the circulation pump 7 together with the cooling water. The cleaning ball enters the circulation pump 7 and collides with the surface of the vane rotating at high speed, absorbs energy and deforms. This deformation is of such a magnitude that the spherical cleaning ball becomes completely flattened, so that the internal air is expelled and, upon exiting the circulation pump 7, is replaced by air and water. The cleaning balls are then sent via the inlet valve 7 to a ball recovery device 8, where they are stored together with water. At the end of this one cycle, the water content of the cleaning balls is checked, and if a large amount of balls with a low water content are found, reprocessing is carried out according to the above-mentioned procedure. When the water-containing treatment of the cleaning balls is thus completed, the three-way valve 10 is operated in the direction of communicating the ball recovery device 8 and the first ball injection device 4,
The cleaning balls are sent out from the first ball injection device 4 toward the condenser 1, and the ball cleaning device starts operating.

In the present invention configured in this way, all of the cleaning balls are in an ideal water-containing state, that is, in a state where the specific weight is equal to that of the cooling water, and the water is uniform as a whole. In addition to being able to guide the cleaning ball to the water chamber, the cleaning ball will not float up in the water chamber on the inlet side of the condenser 1.

Next, another embodiment of the present invention will be described with reference to FIG. 2, in which the same parts as in the previous embodiment are given the same reference numerals.

In FIG. 2, the ball circulation device in this embodiment is connected to a circulation conduit 12 that is branched from the downstream path of the ball recovery device 8 and whose other end is connected to the upstream path of the circulation pump 7. It is provided with a three-way valve 10 provided at a position communicating with the pipe 6. Note that the reference numeral 13 in the figure indicates an on-off valve. Also in this embodiment, the on-off valve 13 is kept in the "open" state prior to operation of the circulation pump 7,
Thereafter, when the cooling water in the circulation path is introduced, by shifting the on-off valve 13 to the "closed" state, it is possible to carry out water treatment using the circulation pump 7 in the same manner as in the previous embodiment.

As explained above, the cleaning ball moisture treatment device according to the present invention is capable of obtaining cleaning balls subjected to highly uniform moisture treatment, and the cleaning effect of heat transfer tubes of a heat exchanger is greatly improved. effect is achieved. Furthermore, since the number of cleaning balls floating in the circulation path is drastically reduced, the recovery rate can be dramatically increased.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing one embodiment of the washing ball water treatment apparatus according to the present invention, and FIG. 2 is a system diagram showing another embodiment of the present invention. 2...Cooling water intake pipe, 3...Cooling water discharge pipe, 4
... first ball injection device, 5 ... ball collection device, 6 ... communication pipe, 7 ... circulation pump, 8 ... ball collection device, 10 ... three-way valve, 11 ... second ball injection device, 12...Circulation conduit.

Claims (1)

[Scope of Claims] 1. A cooling water intake pipe and a cooling water discharge pipe are communicated via a communication pipe equipped with a circulation pump, and a first ball is provided at the communication part of the communication pipe with the cooling water intake pipe. A ball collecting device is provided at a communication portion between the injection device and the cooling water discharge pipe, and a ball collecting device is interposed in the path of the communication pipe from the circulation pump to the first ball injection device. 2. A water-containing cleaning ball water treatment device according to the invention, further comprising a ball circulation device connected to the ball recovery device and guiding the cleaning balls extracted from the ball recovery device to the inlet side of the circulation pump. 2. The ball circulation device has a circulation conduit branched from the downstream path of the ball collection device, the other end of which is connected to the upstream path of the ball collection device, and a three-sided circulation conduit provided at a position where this circulation conduit communicates with the communication pipe. 2. The cleaning ball moisture treatment device according to claim 1, further comprising a valve and a second ball injection device provided at a position where the circulation conduit communicates with the cooling water discharge pipe. 3. The ball circulation device includes a circulation conduit branched from the downstream path of the ball recovery device and connected at the other end to the upstream path of the circulation pump, and a three-way valve provided at a position where this circulation conduit communicates with the communication pipe. A washing ball water treatment apparatus according to claim 1, characterized in that the cleaning ball water treatment apparatus is equipped with: