JPH01146984A - Sticking inhibitor of particulate material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an agent for preventing the adhesion of powder and granules, and in particular, prevents the adhesion of powder and granules in hoppers and pipes during the feeding process of powder and granules such as coal. The present invention relates to an anti-adhesion agent for powder and granular materials that can prevent clogging problems.

[Background Art] In recent years, the importance of coal as an alternative fuel to petroleum has increased, but since coal is a solid fuel, its handling is more complicated than that of petroleum, which is a liquid fuel. Particularly in the transport process from coal storage locations (e.g. outdoor coal storage yards) to combustion equipment, clogging problems due to adhesion occur.
This is a major problem in transporting coal at the site. That is, when conveyed from a yard by a belt conveyor or discharged from a hopper, in factories with crushers, clogging problems due to coal adhesion have become a problem in the crushers.

As methods for preventing clogging problems caused by adhesion of coal, there are currently proposed methods such as removing adhering coal using a scraping device or an i-moving device, or forming a water film on the inner surface of the transfer pipe (in particular, 1988-139949, Utility Model Application 59-74845, JP 59-139950).

[Problems to be solved by the invention] However, if a device such as a scraping device is not used, clogging problems still occur due to adhesion of coal, and even if the above-mentioned scraping device is used, In some cases, the effect may not be obtained. Moreover, installing a scraping device or the like is not an advantageous method in terms of maintenance, installation space, etc.

Therefore, there has been a strong demand for the development of a technique that solves the problem of blockage caused by adhesion of particulate matter such as coal.

[Means for Solving the Problems] The present invention solves the above-mentioned conventional problems, and provides an anti-adhesion agent that enhances the fluidity of powder particles such as coal and prevents clogging problems due to adhesion. be.

The anti-adhesion agent for granular materials of the present invention is characterized by containing a higher fatty acid and/or a higher fatty acid salt.

As a result of various studies to prevent the adhesion of coal, the present inventors obtained the following knowledge and completed the present invention. That is,
Coal that is prone to clogging problems due to adhesion is said to generally have a high moisture content, small particle size, and a brand with a high ash content, especially St. Therefore, for example, if the moisture content of coal is reduced, rA occlusion damage can be prevented to some extent, but this requires a moisture content reduction of several percent.
This is not an advantageous method considering the processing cost.

Therefore, as a result of further investigation, we found that, in particular, r'A due to adhesion
It has been concluded that it is advantageous to use drugs to improve the fluidity of coals that are prone to M disorder, and that higher fatty acids and/or their salts are effective drugs for improving fluidity. They discovered this and completed the present invention.

The present invention will be explained in detail below.

In the present invention, as the higher fatty acid, linear or branched fatty acids having 10 or more carbon atoms such as cabric acid, lauric acid, palmitic acid, stearic acid, and behenic acid can be used. In addition, higher fatty acid salts include metal salts of higher fatty acids having 10 or more carbon atoms, specifically alkali metal salts such as Na salts and K salts, alkaline earth metal salts such as Ca salts and Mg salts, In addition, Zn salt, He1 salt, etc. can be used.

The anti-adhesion agent of the present invention may consist only of these higher fatty acids and/or higher fatty acid salts, or may contain other additives such as modifiers.

The anti-adhesion agent of the present invention is preferably added in such a manner that the weight of the higher fatty acid and/or higher fatty acid salt is 0.01 to 1% based on the weight of the powder to be treated.

If the amount added is less than 0.01%, sufficient improvement effects cannot be obtained. On the other hand, if it exceeds 1%, there is no difference in effectiveness, and the processing cost increases, which is economically disadvantageous.

There are no particular restrictions on the method of adding the anti-adhesive agent of the present invention, but
If it is a process of transferring powder or granular material such as coal, it is preferable to add it as early as possible to achieve a sufficiently mixed state. Examples of the addition method include a method of adding with an autofeeder or the like onto powder particles such as coal being transported by a belt conveyor, and a method of adding and mixing in advance in a hocher.

The anti-adhesive agent of the present invention is effective on coal, ore, limestone, serpentine, oil coke, etc., and is particularly effective on particles with a particle size of 0.5 m.
It is effective for powder containing 10% by weight or more of granular powder of m or less.

[Function] The addition of higher fatty acids and/or higher fatty acid salts increases the lubricity between the powder particles and greatly improves fluidity. For this reason, adhesion of the powder or granules to other members is effectively prevented, and it is possible to prevent clogging problems due to adhesion.

[Examples] The present invention will be described in more detail with reference to Examples and Comparative Examples below, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Examples 1 to 5, Comparative Examples 1 and 2 The anti-adhesion effects of the chemicals shown in Table 1 were investigated through the following experiment.

Coal (Piette charcoal) containing the amount of chemicals shown in Table 1 in a container with a diameter of 10 cm and a depth of 2 cm. Moisture 10.8% by weight.

Take a sample (average particle size: 2.2 mm), cover it on a stainless steel plate, and remove only the container. Next, the stainless steel plate was slowly tilted and the angle from when the coal on the plate started to slide until the entire amount had slipped off was measured.

For comparison, a similar experiment was conducted using coal to which no chemicals were added (Comparative Example 1.2). The coal used in Comparative Example 1 was the same type as that used in Examples 1 to 5, but in Comparative Example 2, Viet coal with a moisture content of 5.8% by weight was used as the test coal.

The results are shown in Table 1.

Table 1 *: (Angle at the start of sliding) - (Angle at which the entire amount slipped) Examples 6 and 7, Comparative Example 3 Piet charcoal was air-dried and sieved into particles with a particle size in the range of 0.59 to 1.19 mm. did. Take 10.0 g of this, add the chemicals shown in Table 2, place it in a stainless steel mortar with an inner diameter of 18 cm and a depth of 18 cm, and stir and mix with a stainless steel rod with a diameter of 4.6 cm and a length of 35 cm. Coal was forcibly attached to the mortar and rod, and the amount of adhesion was measured. Note that the stirring time was 10 minutes.

For comparison, experiments were conducted in the same manner on a sample to which no chemical was added, and the amount of adhesion was measured (Comparative Example 3).

The results are shown in Table 2.

Table 2 From Tables 1 and 2, it is clear that the anti-adhesion agent of the present invention exhibits an extremely excellent anti-adhesion effect.

[Effects of the Invention] As detailed above, the powder adhesion prevention agent of the present invention contains a higher fatty acid and/or a higher fatty acid salt,
The fluidity of powder and granules can be greatly improved and adhesion can be effectively prevented. Therefore, the adhesion prevention agent of the present invention effectively prevents clogging problems caused by adhesion of powder and granules to the hopper and inner wall of pipes during the transfer process of powder and granules such as coal,
8. Transmission efficiency can be greatly improved.

Claims (4)

[Claims] (1) An anti-adhesion agent for powder and granular materials, which is characterized by containing a higher fatty acid and/or a higher fatty acid salt. (2) The anti-adhesion agent according to claim 1, wherein the higher fatty acid is a fatty acid having 10 or more carbon atoms. (3) The anti-adhesion agent according to claim 2, wherein the higher fatty acid is cabric acid, lauric acid, palmitic acid, stearic acid or behenic acid. (4) Any one of claims 1 to 3, wherein the higher fatty acid salt is a sodium salt, potassium salt, calcium salt, magnesium salt, zinc salt, or aluminum salt of a higher fatty acid. Anti-adhesive agent as described in section.