JPS59180300A - Cleaning ball for use in high-temperature superheated water - Google Patents

Abstract

PURPOSE:To provide a cleaning ball for use in high-temperature super-heated water which has excellent heat resistance and wear resistance performance. CONSTITUTION:A cellulose sponge cleaning ball is produced by mixing and foaming pulp, which is the raw material of cellulose, with fibers such as flax or hemp which has properties of high strength, good heat resistance and wear resistance. It is desirable to limit the quantity of fiber mixing to the extent that it can improve the heat resistance and wear resistance performance, and the quantity of raw material in the range of 1-90vol% with which the pulp can be molded and continuous air bubbles can be formed at the time of foaming. As this cleaning ball is made of cellulose and fibers such as flax or hemp, it can be used in the superheated water up to 170 deg.C without being desintegrated.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] This invention relates to cleaning balls for removing dirt such as scale adhering to the inner surface of heat exchanger tubes, etc. Those used in high-temperature hot water can cause phlegm.

[Prior art and what’s between”, Part 1]

Conventionally, a rubber sponge cleaning ball is used to remove scale and other dirt that adheres to the inner surface of the heat exchanger S sinking heat tube.The ball is placed on a stream of water and circulated through the loop containing the heat exchanger tube. However, rubber sponges have insufficient hot water resistance and disintegrate in a short period of time in high-temperature hot water of about 80°C or higher, making them unsuitable for use. It has been desired to develop a cleaning ball that is highly resistant to hot water for equipment that uses hot water at a temperature of about 80°C or higher, such as heat exchangers in power plants.

[Purpose of the invention]

This invention improves the problems of the prior art described above.
An object of the present invention is to provide a cleaning ball that has excellent hot water resistance and abrasion resistance and can be used in high-temperature hot water of about 80°C or higher and up to about 170°C.

[Summary of the invention]

In this invention, pulp, which is the raw material for cellulose, is mixed with strong fibers such as flax and hemp, which are resistant to hot water and have excellent abrasion resistance, and foamed to clean the cellulose sponge.
Create a ball. The amount of fiber mixed should be 1 to 9 Qv, which can be expected to improve the hot water resistance and abrasion resistance of the sponge, and which can form open cells during molding and foaming of the raw pulp.
oLimited to 1%.

[Effect of the invention 1 As mentioned above, the cleaning ball of the present invention is made from fibers such as dicellose, flax, and hemp, which is different from conventional gono-sponge cleaning balls, so it can withstand temperatures up to about 170°C. Can be used in high-temperature hot water without disintegrating. Furthermore, since the cellulose sponge of the present invention contains fibers such as flax and hemp, which are strong and have excellent abrasion resistance, the cleaning ball itself has good abrasion resistance.

[Embodiments of the invention]

Example 1: A mixture of pulp 64 vo 1%, flax fiber 113 vo I, and hemp fiber 18 vo 1% was mixed with mirabilite fine powder, and the mixture was heated in a mirabilite bath to dissolve the mirabilite fine granules. A cellulose sponge with a porosity of about 95% was prepared by melting and flowing out. Approximately 27 straight balls were prepared from this and used in the following experiment.

The hot water resistance, cold part, and abrasion characteristics of the conventional rubber sponge cleaning ball and the cellulose sponge cleaning ball described above were investigated using an autogelape as shown in Figure 1. In Figure 1, 1 is a container of autogelape,
2 is a lid, 3 is a bolt that fixes the lid to the container, 4 is a rotating drum, 5 is a rotating shaft, 6 is an electric furnace, and 7 is a cleaning ball used in the experiment. Fill container 1 with pure water,
and the rotating drum 4 (this interval is smaller than the diameter of the ball, which is 21.5 mm), attach the lid 2 to the container 1 with the bolt 3, and pour pure water at 120 mm. Heat it to around the rotating drum 4;)l; 2~3y
The experiment was conducted by rotating at y+/sec.

The results of the 7-day experiment are shown in Figure 21:81-Figure 4. The conventional rubber-sponge (5) cleaning 9 pole swells in hot water and increases in diameter, at the same time as it disintegrates and its weight decreases (i''82■1, Figure 3). The cellulose sponge of this invention is deformed into a hollow shape, loses almost all its elasticity, and the dynamic friction force decreases significantly (Fig. 4).
The weight of the ball (a) hardly changes, and its dimensions also change little except for a slight decrease in the initial stage (Figs. 2 and 3).
I)21). In addition, the dynamic frictional force also decreases slightly at the beginning, but after that it does not change by 1"J (Figure 4).

From these results, it has been found that the cellulose sponge cleaning ball of the present invention has extremely excellent hot water resistance, friction in hot water, and wear percentage, and is suitable for removing dirt in high-temperature hot water. did.

Example: An experimental loop made to simulate an actual heat exchanger was
(Inlet temperature 12 including 8,4, S+ o2540ppm
When the cellulose sponge cleaning ball of this invention was circulated in the flow of 0°C geothermal water (rT), the silica adhering to the inner surface of the vibrator, which forms part of the loop, was successfully removed. The ball showed almost no damage even after 7 days of continuous use, proving that it was durable enough to withstand use.

Embodiment 3: In the above embodiment, a cleaning ball containing linseed or hemp fibers is described. The cleaning ball may also be made by mixing other fibers, such as nylon 6 fibers. It is possible and valid.

Embodiment 4: In the above embodiment, a heat exchanger for a geothermal binary-lightning plant was described, but it is also applicable to heat exchangers for seawater desalination plants, ocean temperature difference power generation, and the like.

[Brief explanation of drawings]

FIG. 1 is a sectional view schematically showing an autoclave used in the experiment of Example 1 of the present invention. 1. Container, 2. Lid, 3. Bolt, 4-rotation drum, 5. Rotating shaft, 6. Electric furnace, 7. Ri, leaning pole. Figures 2 to 4. 2 is a diagram showing the experimental results of Example 1 of the present invention, FIG. 2 is a diagram showing changes in weight, FIG. 3 is a diagram showing changes in dimension (diameter), and FIG. 4 is a diagram showing changes in dynamic frictional force. .

Claims (1)

[Claims] Tough, hot water resistant and abrasion resistant fibers 1-9Q v
A cleaning fist ball for use in high-temperature hot water, characterized by being made of cellulose foam containing 0.1% and having continuous air bubbles.