JPH01274000A - Water chamber of heat exchanger - Google Patents

Abstract

PURPOSE:To enable obstacles stored in a water chamber to be continuously discharged during operation by a method wherein a space for controlling some obstacles is arranged below a water chamber, an obstacle discharging device is arranged within the space and an obstacle discharging port is arranged in an obstacle moving direction. CONSTITUTION:Some obstacles 5 are collected at a bottom part of a water chamber 1, a cavity 3 having a shape suitable for installing an obstacle discharging device 2 is provided. An obstacle moving plate is provided with an obstacle discharging port 4 having a diameter capable of performing a simultaneous discharging of the obstacles together with a part of cooling water and with a discharging valve 6. A screw conveyor 2 arranged at a bottom part of the water chamber 1 is operated, thereby some obstacles 5 stored in the water chamber 1 are moved toward the discharging port 4. The cavity 3 at the bottom part of the water chamber has a shape which is suitable for installing of the screw conveyor, collecting of some obstacles and their movement. The obstacles moved under an operation of the screw conveyor are discharged out of the water chamber through the obstacle discharging port 4 together with a part of the cooling water. A terminal end of the discharging port 4 is connected to a water drain pipe having a pressure lower than that of the discharging port or connected to a separate straighner and then only the obstacles are recovered.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a water chamber of a heat exchanger having two or more folded flows, and in particular,
A water chamber of a heat exchanger, such as a condenser, that has a water chamber on the water return side that has no outlet for foreign matter other than the heat transfer tube, but allows foreign matter accumulated in the water chamber on the water return side to be discharged during operation. Regarding.

[Conventional technology]

Conventionally, removal of foreign matter from cooling water during operation has been considered on the inlet or outlet side of the water chamber, but not on the water return side where there is no entrance or exit for foreign matter other than the cooling pipe. There wasn't. Therefore, if foreign matter accumulated in the water chamber on the water return side during plant operation is discharged, the plant must be stopped, or the water flow to only the water chamber must be stopped, and after draining,
It was removed manually from manholes, etc. Plant shutdowns and partial cutoffs of water flow to the water chambers forced the suspension of power generation and load restrictions, reducing operational efficiency and hindering normal operation.

In addition, the work environment for the workers was not good because the manual work of removing foreign matter was carried out inside a closed container called a water chamber.

Incidentally, related devices of this type include, for example, Japanese Patent Application Laid-Open No. 57-184866 and Japanese Patent Application Laid-Open No. 57-188999.

[Problem to be solved by the invention]

Conventionally, heat exchangers such as condensers that have a water chamber on the water return side have not taken into consideration the discharge of foreign matter accumulated in the water chamber on the water return side, and when discharging foreign matter, the plant must be stopped or After stopping the water flow to the water chamber and draining the water, the worker entered the water chamber.

Foreign matter was removed manually, or if no one could enter the water chamber, the water chamber was disassembled to remove the foreign matter. When foreign matter accumulates, it not only clogs the cooling pipes and causes a decline in performance, but also causes corrosion of the cooling pipes, so it cannot be left untreated, and the plant must be shut down each time.

We were forced to stop the water flow and carry out work to remove foreign matter.

Work to remove foreign matter not only interferes with normal plant operation, but also poses safety problems for workers, as it reduces operational efficiency and requires work to be done in a closed room. In addition, a drain outlet is installed at the bottom of the water chamber on the water return side, but even if the outlet is opened during plant operation, foreign matter can only be discharged from a very limited area near the outlet, making it almost ineffective. There wasn't.

An object of the present invention is to automatically discharge foreign matter from the water return side, which could not be done in the past, without manual effort, while continuing operation.

[Means to solve the problem]

The purpose of the above is to use a device to move foreign matter accumulated in the water chamber on the water return side. This can be achieved by installing a discharge device in the water chamber on the water return side, making the water chamber a shape suitable for the foreign matter moving device, and installing a discharge port of an appropriate diameter at the destination of the foreign matter movement in the water chamber.

Furthermore, this can be achieved more effectively by operating the foreign matter discharge device and opening the discharge port during the operation of the backwashing device installed for removing foreign matter from the water chamber at the inlet and outlet of the heat exchanger.

[Effect]

The foreign matter discharging device installed in the water chamber on the water return side operates to move foreign matter toward the discharge port at a portion provided at the bottom of the water chamber where foreign matter gathers. As a result, the accumulated foreign matter moves to the foreign matter discharge port, and is automatically discharged along with a portion of the cooling water from the opened discharge port. In addition, by setting the operating time of the foreign matter ejector to include the time when the water flow is switched while the existing water chamber backwashing device is in operation, the foreign matter that is pressed against the end of the cooling pipe will fall due to the water flow, and will be deposited at the bottom of the water chamber. to gather,
Foreign matter can be more effectively collected and discharged from the outlet to the outside of the water chamber.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

A recess 3 with a shape suitable for collecting foreign matter 5 and installing a foreign matter discharge device 2 is provided at the bottom of the water chamber 1 on the water return side, and the destination of the foreign matter is provided with a diameter that can discharge part of the cooling water and the foreign matter at the same time. A foreign matter discharge port 4 and a discharge valve 6 are provided.

According to this embodiment, by operating the screw conveyor 2 provided at the bottom of the water return side water chamber 1, the foreign matter 5 accumulated at the bottom of the water chamber is moved in the direction of the discharge port 4. The recess 3 at the bottom of the water chamber has a shape suitable for installing a screw conveyor and collecting and moving foreign matter. Foreign matter moved by the operation of the screw conveyor is discharged from the foreign matter outlet 4 along with a portion of the cooling water outside the water chamber. is discharged to. The terminal end of the discharge port 4 may be connected to a drain pipe (not shown) whose pressure is lower than that of the discharge port, or may be connected to a separate strainer (not shown) to collect only foreign matter.

Further, the foreign matter discharge operation time is determined during the operation of the existing backwashing device, as shown in the operation chart shown in FIG.

By setting the cooling water flow direction to include at least the time for reversing the direction of the cooling water from the normal flow to the reverse flow or from the reverse flow to the normal flow, the foreign matter discharging function is further improved.

It is easy to operate the backwash device and the foreign matter discharge device at the timing shown in FIG. 3 by detecting the opening/closing signal of the valve of the backwash device.

When the backwashing device starts operating, the flow direction of the cooling water changes from normal flow to reverse flow.
The foreign object that was pressed by the water flow comes off the end of the tube,
It falls and collects at the bottom of the water chamber. This situation is shown in Figures 4 and 5.
As shown in the figure. Also, when changing from reverse flow to forward flow, the flow direction of the cooling water starts from reverse flow, stops once, and changes to forward flow, but at this time, the foreign matter that was pressed against the cooling pipe outlet end 8 by the water flow is It comes off from the edge, falls and collects at the bottom of the water chamber. This situation is shown in FIG. 9 is the cooling water flow line. In this way, according to this embodiment, foreign matter accumulated on the water return side can be effectively discharged without stopping the operation. Other embodiments are shown in FIGS. 7 to 10.

〔Effect of the invention〕

According to the present invention, foreign matter accumulated in the water return metering chamber can be automatically and easily discharged to the outside of the water chamber without stopping plant operation.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the vicinity of the water chamber on the return side of a condenser according to an embodiment of the present invention, Fig. 2 is a sectional view taken along the ■-■ arrow in Fig. 1, and Fig. 3 is a foreign matter discharge device of the present invention. Figure 4 is an illustration of the position of foreign objects during normal operation; Figure 5 is an illustration of the position of foreign objects immediately after cooling water flows back due to backwashing; The figure is an explanatory diagram of the position of foreign matter immediately after backwashing, FIG. 7 is an explanatory diagram of the second embodiment of the present invention, and FIG.
The figures are a cross-sectional view taken along the line ■--■ in FIG. 7, FIG. 9 is also a cross-sectional view of the third embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along the line X--X in FIG. 1... Water return side water chamber, 2... Foreign matter ejector, 3...
・Water chamber bottom shape, 4...Foreign matter outlet, 5...Foreign matter,
6... Foreign matter discharge valve, 7... Cooling pipe inlet end, 8...
Cooling pipe outlet end, 9... Cooling water flow line, 10... Water flow nozzle. ＼C゛Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. N9 Fig. 10 ←×

Claims (1)

[Claims] 1. In a multi-fold tube heat exchanger in which a cooling medium containing foreign matter is used in the water chamber side, a space is provided below the water chamber on the water return side to collect the foreign matter; A foreign matter discharge device is installed in the space, and a foreign matter discharge port is provided in the direction of movement of the foreign matter, so that the foreign matter accumulated in the water chamber can be continuously discharged during operation. Heat exchanger water chamber. 2. Deforming the lower part of the water chamber on the water return side into a funnel shape and providing the foreign matter discharge port at the tip of the tapered side to remove the foreign matter accumulated in the water chamber using a part of the cooling medium in the water chamber; Alternatively, the water chamber of a heat exchanger according to claim 1, wherein a pressure fluid from another source is used in combination to enable foreign matter to be discharged during operation of the heat exchanger.