JPS601559B2 - Cleaning bowl for high temperature hot water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention is a cleaning ball for removing dirt such as scale adhering to the inner surface of heat transfer tubes of a heat exchanger. Concerning what is used inside.

[Prior art and its problems] Traditionally, rubber, sponge cleaning balls, and balls are used to remove dirt such as scale that adheres to the inner surfaces of heat exchanger tubes, etc., and they are placed on a stream of water to clean the loop that includes the heat exchanger tubes. It was circulated inside to remove dirt.

However, rubber and sponge have insufficient hot water resistance, and
It is not suitable for use because it disintegrates in a short time in high-temperature hot water of about 0 or more. Therefore, for equipment that uses hot water at a temperature of about 8,000 or more, such as heat exchangers in geothermal/ginary power plants, we recommend cleaning with excellent hot water resistance.
The development of a ball was desired. [Object of the invention] This invention improves the problems of the above-mentioned prior art.
Excellent hot water resistance and abrasion resistance, about 8,000 or more and 1,700
The purpose is to provide a cleaning ball that can be used in high-temperature hot water up to about 0.

[Summary of the invention] In this invention, pulp, which is the raw material for cellulose, is mixed with fibers such as flax, hemp, etc., which have excellent hot water resistance and abrasion resistance, and are foamed to make cellulose, cleaning sponges, and balls. .

The amount of fiber mixed is limited to 1 to 9 ol%, which is expected to improve the hot water resistance and abrasion resistance of the sponge, and which allows formation of open cells during molding and foaming of the raw material pulp. [
[Effects of the Invention] As mentioned above, unlike conventional rubber and sponge cleaning balls, the cleaning ball of the present invention is made from cellulose and fibers such as flax, hemp, etc.;
It can be used in hot water at temperatures up to about 7,000 ℃ without disintegrating.

In addition, the cellulose and sponge of the present invention contain strong fibers such as flax and hemp, which have excellent abrasion resistance, and have good cleaning and abrasion resistance of the ball itself. [Embodiments of the Invention] Example 1 A mixture of 64 vol% pulp, 18 vol% flax fibers, and 18 vol% hemp fibers was mixed with pongee powder made from ramie, and heated in a Mitsuishi-sho bath to make sanito. A cellulose sponge with a porosity of approximately 95% was prepared by melting and flowing out the string grains.

A ball with a diameter of approximately 27 skin was prepared from this and used in the following experiment. The hot water resistance, friction, and abrasion characteristics of conventional rubber and sponge cleaning balls, the above-mentioned cellulose, and sponge cleaning were investigated using an autogrape as shown in Figure 1.

In Figure 1, 1 is an autogrape container, 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 the container 1 with pure water, clean it between the container 1 and the rotating drum 4 (this gap is smaller than the diameter of the ball, and set it on the 21/5 side), put the ball 7 in a bag, and close the lid 2 with the bolt 3. was fixed in the container 1, pure water was heated to 120 ℃, and the rotating drum 4 was rotated at a circumferential speed of 2 to 3 m/sec to perform the experiment. The results of the 7-day experiment are shown in FIGS. 2 to 4.

Conventional rubber sponge A cleaning balls swell in hot water and as their diameter increases, they similarly disintegrate and their weight decreases (Figures 2 and 3). Eventually, it deforms into a chain shape, loses most of its elasticity, and the dynamic frictional force decreases significantly (Figure 4). On the other hand, in the cellulose and sponge cleaning ball B of the present invention, the weight hardly changes, and the dimensions also hardly change except for an initial decrease in actual drying (FIGS. 2 and 3). In addition, the dynamic frictional force also decreases slightly at the beginning, but does not change at all after that. (Figure 4). From these results, it has been found that the cellulose, sponge cleaning ball, and ball of this invention have extremely excellent hot water resistance, friction and abrasion properties in hot water, and are suitable for removing dirt in high temperature hot water. did. Example 2 PH was applied to an experimental loop created to simulate an actual heat exchanger.
8.4, Inlet temperature 1200 including Sio2540PPm
When geothermal water with a temperature of The ball showed almost no damage even after continuous use, proving that it can withstand use.

Example 3 Although the above example describes a cellulose sponge cleaning ball containing flax fibers, it is also possible and effective to make it by mixing other fibers, such as nylon 6 fibers. .

Embodiment 4 In the above embodiment, a heat exchanger for a geothermal binary power generation plant was described, but it is also applicable to a heat exchanger for a seawater desalination plant or ocean temperature difference power generation.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view schematically showing an autoclave used in the experiment of Example 1 of the present invention. 1... Container, 2... Lid, 3... Bolt, 4... Rotating drum, 5... Rotating shaft, 6... Electric furnace, 7... Cleaning. ball. Figures 2 to 4 are diagrams showing the experimental results of Example 1 of the present invention, where Figure 2 shows the weight change, Figure 3 shows the dimension (diameter) change, and Figure 4 shows the force friction. FIG. 3 is a diagram showing changes in force. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 Fibers 1 to 90 that are tough and have excellent hot water resistance and abrasion resistance
A cleaning ball for high-temperature hot water, characterized in that it is made of cellulose foam containing vol% and continuous cells.