JPH0989496A - Washing method for tubular heat-exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute washing of the ball of a heat transfer pipe, in an absorption refrigerator having different heat transfer pipe bores and a plurality of heat-exchangers incorporated therein. SOLUTION: A ball divider 11, etc., is arranged in a ball introduction line. Balls are divided into ball diameters matching respective heat transfer pipe bores and introduced into a plurality of heat-exchangers 1 and 2 and simultaneously washed. The balls are captured by a ball collector 4 for recirculation.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cleaning the inside of a heat transfer tube in a tube heat exchanger, and more specifically, for cleaning, for example, a cleaning body, which is an elastic ball, is placed in the heat transfer tube. The present invention relates to a cleaning device for passing through, and particularly to a cleaning device for simultaneously cleaning a plurality of small-sized tubular heat exchangers.

[Prior Art] Conventionally, in a heat exchanger for a refrigerator, a tube heat exchanger in which a large number of heat transfer tubes are arranged has been used, and cooling in this tube heat exchanger is performed. Fresh water is generally used as water, but seawater is sometimes used. And when operating this tube heat exchanger, scale and slime adhere to the inner wall of the heat transfer tube on the cooling water side, and the heat transfer performance gradually decreases. Work to remove is required. A known method for cleaning the inner wall of the heat transfer tube in this tube heat exchanger is to use sponge balls as the cleaning body and remove the deposits on the inner wall of the tube by forcing it into the heat transfer tube. ing. An outline of a conventional cleaning device using such a sponge ball as a cleaning body is described in, for example, Japanese Patent Laid-Open No.
-13095. In this conventional device, one circulation pipeline and a bypass pipeline connected to the circulation pipeline are combined to provide a mechanism for switching the flow of the carrier water flowing in these pipelines, and these are integrated into a unit. There is provided a cleaning device which is built-in and capable of continuously flowing sponge balls into a heat exchanger for continuous cleaning.

Further, as in JP-A-58-40497, during continuous automatic cleaning operation, sponge balls may be worn down to a prescribed size or less. There is also proposed a device capable of automatically selecting an effective sponge ball in the circulation path and taking out a worn sponge ball out of the system.

[Problems to be Solved by the Invention] However, in the conventional cleaning apparatus described above, it is not possible to simultaneously clean a plurality of heat exchangers having different inner diameters of heat transfer tubes for each heat exchanger. It was necessary to install a cleaning device for each exchanger.

Particularly, in the absorption refrigerator, there is a type of heat exchanger through which cooling water passes, in which the inner diameter of the heat transfer tube is different between the absorber and the condenser, and thus the inner diameter of the heat transfer tube is different. There is no way to wash two heat exchangers at the same time, but a method to wash only a small diameter heat exchanger with balls has been adopted.
From the standpoint of high efficiency operation and energy saving, the establishment of a new cleaning method has been desired. Therefore, an object of the present invention is to provide a method in which the sponge balls can be simultaneously circulated and cleaned in a plurality of tube heat exchangers having different inner diameters of the heat transfer tubes for each heat exchanger.

[Means and Actions for Solving the Problems] The feature of the cleaning method for a tubular heat exchanger of the present invention that achieves the above object is that the cleaning body for cleaning the inside of the tubular heat exchanger is a heat exchanger. With the introduction pipe that is introduced into the upstream water passage and the take-out pipe that takes out the cleaning body that has passed through the heat exchanger from the ball collector in the water passage downstream of the heat exchanger, the above-mentioned pipe type by switching the valve open and closed It is a cleaning device connected to the heat exchanger so that water can be passed through and cut off.This cleaning method uses a plurality of pipe types in which the inner diameter of the heat transfer pipe is different in the introduction pipe line for introducing the sponge ball. In order to clean the heat exchanger, a classifier is installed in the introduction pipe to classify the size of the balls in the fluid, and the classified balls are introduced into the heat exchanger corresponding to the diameter of each heat transfer tube to clean the inside of the pipe. Once again, catch the ball again with the ball collector and collect it, Method of performing circulating washing I is in place are configured. In the cleaning of the present invention having the above-described structure, the balls having different outer diameters are mixed and flow in the ball introduction pipe line so that different balls can be divided in water inside the ball sorter. Provide a gap such as a hole that matches the diameter of the ball, guide only one small diameter ball from this part to one pipe line, and divide the large diameter ball that cannot pass through the division hole or gap into another pipe line. Divide.

A plurality of heat exchangers can be divided into three or more kinds of sponge balls at the same time by installing another sorter on the downstream side of this sorter according to the diameter of the balls to be divided. A cleaning method capable of cleaning can also be provided.

[Embodiment] The present invention will be described below based on an embodiment shown in the drawings. In FIG. 1, reference numerals 1 and 2 denote pipe heat exchangers, and the cooling water taken in from the cooling water inlet pipe 5 flows in the heat transfer pipe (not shown) of the pipe heat exchanger 1 in the right direction of the drawing. Through the cooling water connecting pipe 6 and the pipe heat exchanger 2
Leading to. The cooling water flows in the heat transfer tube (not shown) of the tubular heat exchanger 2 in the leftward direction of the drawing, and when passing through the cooling water outlet tube 7, flows inside the ball collector 4 in this pipeline to cool the cooling water. Is introduced into a predetermined facility from the cooling water outlet pipe 7. Such a configuration
As seen in the absorption refrigerator, the case where the inner diameter of the heat transfer tube of the tube heat exchanger 2 is larger than the inner diameter of the heat transfer tube of the tube heat exchanger 1 is shown, and such a configuration is common. . The ball collector 4 has a function of catching the sponge balls flowing down while floating in the cooling water and sending the sponge balls to the ball take-out pipe 18, and the balls are sucked by the cleaning device (a part in the figure). . A sponge ball, which is a cleaning body, is delivered from a cleaning device (a part in the figure) to the ball introducing pipe 10. It's mixed. The sponge balls of the ball introduction pipe 10 are divided into small-diameter balls and large-diameter balls by the sorter 11, and the small-diameter balls are introduced from the ball introduction pipe 14 into the cooling water inlet pipe 5 for cleaning the pipe heat exchanger 1. To be done. The large diameter balls are introduced into the cooling water communication pipe 6 from the ball introduction pipe 14 for cleaning the pipe heat exchanger 2. Only the small balls divided by the divider 11 are supplied for cleaning the tubular heat exchanger 1. The tube heat exchanger 2 includes a tube heat exchanger 1
Small-diameter balls for cleaning also flow in, but problems such as blockage in the heat transfer tube do not occur.

FIG. 2 shows an embodiment in which the inner diameter of the heat transfer tube of the tubular heat exchanger 2 is smaller than the inner diameter of the heat transfer tube of the tubular heat exchanger 1. The large-diameter balls that have passed through the heat transfer tube of the tubular heat exchanger 1 are captured by the ball collector 4 provided in the conduit of the cooling water communication pipe 6 and sucked into the ball extraction pipe 18. In the ball throw-in pipe 10, a large diameter ball and a small diameter ball are mixed and flowing, but are divided into a small diameter ball and a large diameter ball by a sorter 11. The divided balls having a small diameter are introduced from the ball introduction pipe 14 to the cooling water communication pipe 6 on the downstream side of the ball collector 4 for cleaning the pipe heat exchanger 2. The large-diameter balls are introduced into the cooling water inlet pipe 5 via the ball introduction pipe 14, and the large and small balls which have been cleaned are mixed in the ball take-out pipe 19 and sucked into the cleaning device (a part).

FIG. 3 shows an embodiment in which three heat exchangers 1, 2 and 3 are installed and the inner diameters of the heat transfer tubes are different from each other. The tubular heat exchanger 1 has the largest inner diameter of the heat transfer tube, the tubular heat exchanger 3 has the smallest inner diameter of the heat transfer tube, and the tubular heat exchanger 2 has the inner diameter of the heat transfer tube in the middle of these. ing. Large, medium and small mixed balls are used as a cleaning device (part A)
The ball is introduced into the ball introduction pipe 10. This ball is sorted by the sorting device 11 into the smallest balls, which are introduced into the cooling water inlet pipe 5 from the ball introduction pipe 14 to clean the inner surface of the heat transfer pipe of the tubular heat exchanger 3 and captured by the ball collector 4. Then, it is sucked into the ball take-out pipe 18. The large-diameter balls and the medium-diameter balls that could not be divided by the divider 11 are introduced into the divider 12, and are divided into medium-sized balls and large-sized balls in this portion, and introduced into the cooling water inlet pipe 5 from the ball introduction pipe 14. The inner surface of the heat transfer tube of the tubular heat exchanger 2 is washed, and the ball collector 4 catches the inner surface of the heat exchanger tube and the ball is taken out by the ball take-out tube 18. The large diameter balls sorted by the sorting device 12 are the ball introduction pipes 1
4 is introduced into the cooling water inlet pipe 5, the inner surface of the heat transfer pipe of the tubular heat exchanger 1 is cleaned, and is captured by the ball collector 4 and sucked into the ball extraction pipe 18. The large, medium and small balls that have cleaned the tubular heat exchangers 1, 2 and 3 flow from the respective ball take-out pipes 18 to the ball take-out pipes 19 to be mixed and sucked into the washing device (a part). Since such an operation is continuously performed, it is possible to provide a method capable of automatically cleaning the heat exchangers 1, 2 and 3 having different inner diameters of the heat transfer tubes simultaneously.

[Effects of the Invention] As described above, the method for cleaning a tubular heat exchanger according to the present invention has a small heat transfer tube inner diameter for cleaning a plurality of tubular heat exchangers. There is an effect that a single cleaning device can achieve optimum automatic operation in which a large ball for cleaning a large-diameter pipe does not flow into the heat transfer tube and causes problems such as blockage of the ball in the tube.

As the sponge ball, an outer diameter ball corresponding to the inner diameter of the heat transfer tube is selected, but in order to wash the small diameter heat transfer tube and the large diameter heat transfer tube at the same time, large and small balls are mixed and used. There is an effect that a safe cleaning method in which a large ball for cleaning a large-diameter pipe does not flow into the small-diameter heat transfer pipe side can be easily obtained.

[Brief description of drawings]

FIG. 1 shows an embodiment in which the inner diameter of the heat transfer tube of the tube heat exchanger 1 is smaller than the inner diameter of the heat transfer tube of the tube heat exchanger 2.

FIG. 2 shows an embodiment in which the inner diameter of the heat transfer tube of the tube heat exchanger 2 is smaller than the inner diameter of the heat transfer tube of the tube heat exchanger 1.

FIG. 3 shows an embodiment when three heat exchangers 1, 2 and 3 are installed and the heat transfer tube inner diameters are different from each other.

[Explanation of symbols]

8 ... Cooling tower 9 Cooling water pipe ... Cooling water pump 10 ...
Cooling water pipe 13 ... Flow rate adjusting valve 15 ... Ball introduction pipe main valve 17
… Ball extraction pipe main valve 20… Ball circulation pump 21… Ball circulation pipe
22 ... Ball collector 24 ... Bypass pipe 25 ... Check valve 26 ... Three-way switching valve 27 ... Ball extraction pipe connection 28 ... Ball introduction pipe connection A ... Washing device

Claims (2)

[Claims] 1. An inlet pipe for introducing a sponge ball, which is a cleaning body for cleaning the inside of a pipe heat exchanger, into a water passage upstream of the heat exchanger, and a sponge ball passing through the heat exchanger downstream of the heat exchanger. Is a cleaning device connected to the pipe heat exchanger by an extraction pipe taken out from a ball collector in the water passage of In order to wash a plurality of tube heat exchangers with different inner diameters, the inlet pipe for introducing the sponge ball is equipped with a divider that can divide the size of the ball in the fluid. Of the heat transfer tube to the upstream side of the heat exchanger that matches the diameter of each heat transfer tube to clean the inside of the tube, and again collect the balls in the ball collector and continuously circulate the balls through the take-out tube. How to clean the vessel. 2. A multi-stage ball sorter is used to form three balls.
The method for cleaning a tubular heat exchanger according to claim 1, wherein a plurality of heat exchangers are simultaneously cleaned while being classified into more than one type.