JPH0633981B2 - Heat exchanger scale removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to various impurities generated in a heat radiating pipe of a heat exchanger used to circulate cold water for culturing saltwater fish and freshwater fish in each water tank. The present invention relates to a scale removal method for a heat exchanger that removes scale from water scale or the like.

(Prior Art) Conventionally, scale is generated and adhered to the surface of the radiating pipe in seawater, fresh water, etc. passing through the main heat exchanger.
Due to the adhesion of the scale, the thermal conductivity to the fluid is extremely weakened and the effect thereof is remarkably deteriorated.
Further, depending on the type of the deposits on the scale, there are many drawbacks that the surface of the heat radiating pipe is eroded or worn and the life thereof is extremely shortened.

Therefore, in general, in this type of cylindrical heat exchanger, it is usual to remove the lid and discharge the water to the internal heat radiation pipe to wash it with a brush or the like. However, with these methods, the scale on the surface of the heat radiating pipe can be relatively removed, but the scale attached to the back surface side of the heat radiating pipe cannot be removed by peeling.

(Problems to be Solved by the Invention) Therefore, the present invention is to solve the above-mentioned disadvantages, and its main purpose is to freeze a heat radiating pipe in a short time and to cool the surface of the radiant pipe by white spots. To produce a frozen film of
This is rapidly washed with water to remove the scale,
Therefore, the inside of the heat exchanger is cleaned, and the efficiency and performance are improved with a short down time.

(Means for Solving Problems) Technical means taken to achieve the above-mentioned object of the present invention are as follows. (A) Titanium inside the tubular body (2),
In a heat exchanger equipped with a heat dissipation pipe (5) such as a copper pipe,
(B) Discharging seawater, fresh water, etc. passing through the inside of the tubular part (2) to the outside, (c) passing a refrigerant through the radiating pipe (5), and cooling the white spots on the outer peripheral surface by cooling. (D) After that, the scale adhering to the outer periphery of the heat radiating pipe (5) is peeled off together with the freezing film of white spots by spraying tap water or the like from above the heat radiating pipe (5). It is characterized by that.

(Embodiment) Next, an embodiment of the present invention will be described with reference to the drawings.
(1) is a cylindrical body (2) of various sizes and legs (3) of various shapes.
(3) and the cylindrical portion (2) is made of synthetic resin obtained by polymerizing the heat insulating layer (14). This barrel part (2)
Inside, the heat radiation pipe (5) formed in a spiral shape is installed in the vertical direction or the horizontal direction. The heat radiation pipe (5) is formed of titanium, stainless steel, copper pipe, or the like as its constituent material. The heat dissipation pipe (5) is securely and firmly supported by a core that stably supports the heat dissipation pipe (5) and wear and damage prevention pipes (7) and (7). Next, a spraying washer (6) is installed inside the cylindrical portion (2) and above the heat dissipation pipe (5). The washer (6) is, for example, a circular ring-shaped body (8) or a rod-shaped body and has a large number of downward ejection holes (9) (9). The circular ring body (8) and the like are connected to a water pipe (10) and the like provided with an on-off valve (18) from the outside. A discharge pipe (12) for flowing water passing through the inside is connected to a lid (11) provided on the cylindrical body (2). Further, a water pipe (13) having an opening / closing valve (17) at the other end of the cylindrical body (2) for allowing seawater, fresh water, etc. to enter.
Has been penetrated. There is a discharge pipe (20) with an opening / closing valve (19) interposed from the water supply pipe (13) for draining the inside of the cylindrical body (2).
Further, at the end of the cylindrical body portion (2), both ends of the circulation pipes (16) (16) connected to the freezing bar (15) are externally connected to both ends of the heat radiation pipe (5). It is configured to do.

(Operation) The present invention has the above-described structure. Now, describing the method of removing this scale, running water such as seawater or fresh water is stopped.
The inside of the tubular portion (2) is emptied by operating the on-off valve (19). Next, the refrigerant from the circulation pipes (16) and (16) from the freezing bar (15) is circulated through the heat dissipation pipe (5), and white spots are formed on the outer peripheral surface of the heat dissipation pipe (5) due to cooling. Cause freezing. After that, by spraying the washing water from the washing device (6) through the ejection holes (9) and (9) on the entire outer circumference of the heat radiating pipe (5), the scale integrated with the freezing is also melted off. It is stripped and removed together with. Further, in the water sprinkling method, the lid (11) may be removed without incorporating the cleaning device (6), and tap water or the like may be sprinkled with a hose. The removed scale causes the water pipe (13) to flow backward together with the washing water and is discharged to the outside through the discharge pipe (20) through the opening / closing valve (19). When the heat radiation pipe (5) is washed, normal operation is performed.

(Effects of the Invention) Since the present invention has the above-described structure, various scales such as scales and impurities adhered to the back surface of the heat radiating pipe, such as washing with water and washing with a brush, as in the conventional scale removing method. With the excellent effect that it can be peeled off and washed cleanly, and the trouble of removing the scale using a special member is unnecessary, the scale can be removed using the freezing bar (15) used. There is a great effect that is not possible in the past. The scale can be removed in a short period of time by freezing the radiating pipe and sprinkling the washing water when freezing occurs on the outer circumference, so the down time can be greatly shortened, and in addition, there is a concern that the radiating pipe will be scratched with a brush etc. Moreover, since the inside of the heat exchanger can always be kept clean, there is an excellent effect that it can be used without significantly reducing the efficiency and performance of heat treatment.

The scale removing method of the heat exchanger of the present invention can be used for other cooling water (food processing, industrial use, etc.) within the scope of the right.

[Brief description of drawings]

1 is a front view of the present invention, FIG. 2 is a partially cutaway sectional view, FIG. 3 is a perspective view of a washer, FIG. 4 is a plan view of a heat exchanger, and FIG. It is sectional drawing of a horizontal type Example. Sign (1)
Is a heat exchanger, (2) is a cylinder part, (3) is a leg part, (5) is a heat dissipation pipe, (6) is a washer, (8) is a circular ring body, (12) is a discharge pipe, ( 13)
Is a water pipe, (15) is a cold building crosspiece, and (20) is a discharge pipe.

Claims (1)

[Claims] 1. In a heat exchanger in which a heat radiation pipe such as a spiral titanium or copper pipe is installed inside a tubular body, the scale attached to the heat radiation pipe is first removed by removing the scale. Seawater, fresh water, etc. that pass through the inside of the body is discharged to the outside, then a refrigerant is passed through the heat radiating pipe and is frozen in a state where white spots are frozen due to cooling on the outer periphery, and then from above the heat radiating pipe. A scale removing method for an exchanger, characterized in that the scale adhering to the outer periphery of the heat radiating pipe and the icing are peeled together by spraying washing water over the entire outer periphery.