JPS61271394A - Slurry dispersion of coal powder or the like - Google Patents

Abstract

PURPOSE:To improve dispersibility, prevent sedimentation and effectively utilize molasses, by adding molasses to a slurry dispersion obtained by dispersing a carbonaceous solid combustible powder in water and/or methanol. CONSTITUTION:Molasses is dissolved in water and/or methanol together with a surfactant etc. A carbonaceous solid combustible powder such as coal powder is dispersed in the soln. to obtain the titled dispersion. The amount of molasses is preferably about 1-50wt% based on the amount of water and methanol.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides carbonaceous solid combustible substance powder such as coal powder, coke powder, charcoal powder, and pitch powder suitable for fuel for boilers, various furnaces, internal combustion engines, etc., in water and/or It relates to a slurry dispersion of coal powder or the like dispersed in methanol.

After the oil shock, petroleum (heavy oil) has been used as an alternative fuel to petroleum.
Fuel COM, which has pulverized coal dispersed inside it, was attracting attention. Recently, highly concentrated slurries in which pulverized coal is dispersed in water, and slurries in which coal powder is dispersed in methanol or a mixture of water and methanol are also being considered since methanol is easily obtained from coal.

In this case, a dispersion of coal powder in water and/or methanol is required, which has a high concentration of coal powder, low viscosity, fluidity, and storage stability that does not cause the coal powder to settle and separate. .

Conventional methods use surfactants, dispersants, protective colloids, etc. to disperse coal powder in a dispersion liquid, but due to the high specific gravity of coal, it tends to settle and separate. Because the powder is porous, the dispersion liquid is absorbed over time and its fluidity deteriorates, so coal powder cannot be dispersed at a concentration higher than about 10% by weight, and a large amount of dispersion liquid is required. there were.

On the other hand, the molasses that remains after the repeated sugar crystallization and separation during the sugar refining process in the sugar industry has alcohol fermentation and other industrial uses, but there is a limit to the amount demanded, and most of the molasses is used as fuel within the factory. is used as. As a result of research into the effective use of molasses, for which development of new uses is eagerly desired, the present inventor discovered that dispersion of molasses by dissolving it in water and/or methanol together with a surfactant, etc., and dispersing coal powder would result in improved dispersion. It has been found that a slurry dispersion which is very good and does not undergo sedimentation separation can be obtained. That is, molasses has a specific gravity of about 1.4 when the water content is %, and most of it is easily dissolved and dispersed in water and methanol. Adding molasses to water and/or methanol improves the dispersibility of coal powder and allows it to be dispersed smoothly. Furthermore, it was found that since the specific gravity of the dispersion liquid becomes heavier, it is useful for preventing the coal powder from settling. Moreover, molasses itself can be obtained at a relatively low price and has the advantage of being highly combustible as a fuel. For this reason, the use of molasses can improve the combustibility of coal powder and the amount of heat generated during combustion. In addition, the effect of improving the dispersibility of molasses is that heavy oil,
Good results can also be obtained when oils such as light oil and kerosene are adsorbed and dispersed in coal powder. Further, the dispersion can be effectively used in water, methanol, or a mixture of both. In this way, the present invention was completed based on the excellent effects of molasses.

The purpose of the present invention is to facilitate the practical use of carbonaceous solid combustible substances such as coal as liquid fuel, and to provide a slurry fuel in which carbonaceous combustible substance powder such as coal powder is stably dispersed in water and/or methanol. The goal is to provide the following. Also,
Another objective is new and effective uses of molasses. The present invention also provides a slurry-like dispersion in which carbonaceous solid combustible material powder such as coal powder is dispersed in water and methanol, which is characterized in that the dispersion contains molasses. This relates to a slurry dispersion.

In the present invention, carbonaceous solid combustible substance powder such as coal powder (hereinafter simply referred to as coal powder, etc.) refers to various types of coal, coal-based coke, charcoal, coal-based pitch (tar pitch), petroleum coke, petroleum pitch, etc. It is a ground powder, the majority of which usually passes through a 100 mesh sieve. These may be used alone or in a mixture of two or more.

Molasses is a dark-colored, thick liquid residue that remains after repeating the process three times to crystallize raw sugar obtained by concentrating sugar solution from sugar cane, sugar beet roots, etc., and then separating the precipitated crystals. Black strapmolasses commonly used in English
It is called. Its composition varies depending on the production area and raw materials, but typical compositions are as follows.

Moisture Weight % Solid content 80% by weight Sugar content (sugar and invert sugar) 62% Organic non-sugar content (gummy substances such as hemicellulose, combustible substances such as amino acids) 10% Ash content (KzO, CaO1, etc.) 8% Specific gravity Approx.
．． 4 Viscosity 40°C 2600 cps (centiboise) Seki°C 1300 cps Mark°C 600 C1) S 70°C 400 CpS The calorie when burned is the same as waterless lignite.

Molasses (80% solids by weight) is soluble or well dispersed in water, methanol, or a mixture of water and methanol. Most components are soluble. In the present invention, the amount of molasses added to water, methanol, or a mixture of water and methanol, that is, a liquid in which coal powder, etc., is dispersed is 1 to 50%.
Weight %, usually about 3 to weight %, is appropriate.

A small amount of a surfactant, a wetting agent, a dispersant, a protective colloid, etc. can be appropriately used in combination to add and mix and disperse coal powder, etc. into a dispersion of water, methanol, or a mixture of both to which molasses has been added.

In particular, when water is used alone, it is preferable to use it in combination, as coal powder and the like will be difficult to wet unless they are used together.

Adding a small amount of surfactant, etc. to water with molasses and methanol, then adding coal powder, etc. to this and stirring and mixing allows easy dispersion, making it possible to create a slurry-like dispersion. can. The amount of coal powder, etc. in the slurry dispersion is 40% by weight or more, preferably 40% by weight or more. Since coal powder and the like are porous and absorb the dispersing liquid, it is practical to use up to about 75% by weight.

When dispersed at a high concentration, the dispersion liquid tends to be absorbed and the slurry state cannot be maintained. Addition of molasses tends to alleviate this phenomenon.

It is also effective to use coal powder with a different particle size in order to disperse the coal powder etc. at a high concentration. Further, heavy oil, light oil, kerosene, etc. can also be added and dispersed together with coal powder, etc.

A known mixing and stirring device can be used for dispersing coal powder or the like into a dispersion liquid.

Next, the characteristics and effects of the slurry dispersion of coal powder, etc. of the present invention will be described.

(1) This slurry dispersion is characterized in that coal powder and the like are dispersed in a dispersion layer mainly composed of water containing molasses and methanol.

(2) By adding molasses, coal powder etc. are smoothly and finely dispersed, and sedimentation separation is significantly improved.

The addition of molasses improves the viscosity and specific gravity of the dispersion, and it also has a good dispersion effect and finely disperses coal powder, etc.
Less tendency for sedimentation and separation. Even if it settles, it does not clump and can be easily dispersed by simple stirring. The combined use of a small amount of a water-soluble polymer compound for dispersing coal powder, etc. is effective, far superior to the use of a water-soluble polymer compound alone, and a synergistic effect is clearly seen.

(3) Coal powder etc. can be dispersed at high concentration and stability is good.

(4) Good flammability.

Since molasses has good combustibility, the slurry dispersion also has good combustibility, and the calorific value is still improved.

Even when it is not possible to disperse coal powder, etc. in water at a high concentration, adding molasses (for example, non-volatile content in weight %) helps the dispersion of coal powder, etc., and significantly reduces the combustible non-volatile content of the slurry dispersion. can be increased, and flammability can be improved.

(5) Molasses improves the dispersibility of coal powder, etc., in any case of water, methanol, or a mixture of water and methanol. However, when a surfactant, a dispersant, a water-soluble polymer (for example, a protective colloid), etc. are used in combination during dispersion, there is an advantage that these can be used in combination with any of anionic, cationic, and nonionic types.

(6) Molasses can be added to and mixed with an existing slurry dispersion of water and/or methanol as a dispersion liquid, such as coal powder, and used as a fuel.

Embodiment 2.3 will be described below.

Example 1 sulfuric acid ester of higher alcohol in 100 parts by weight of water)
Petroleum pitch powder (specific gravity: 1.2
5 (passed through a 150 mesh sieve) was added and mixed to obtain a slurry dispersion with good dispersion. For comparison, a slurry dispersion without molasses was prepared with the above blending ratio, but a good dispersion state could not be obtained. Also, regarding the above blending ratio, a slurry dispersion was made by adding 0.3 parts by weight of hydroxypropyl cellulose without adding molasses, but this dispersion was better than the former comparative example. , the dispersibility is lower than in Examples. After leaving the slurry dispersion at room temperature for 2 days, an investigation revealed that only in the example, a smooth slurry dispersion was obtained with simple stirring, but in the comparative example, the precipitate was hard and difficult to redisperse. Ta.

Example 2 Polymer of higher alcohol sulfate ester and ethylene oxide in 100 parts by weight of water (trade name: Pronone, NOF fi
) 1.0 ERW part, alkylarylsulfonic acid dispersant 0
．． A slurry-like dispersion in which coal powder with a solid content of 71.7% by weight is stably dispersed by adding and mixing 5 parts by weight of molasses side and 250 parts by weight of coal powder (passed through a 100-mesh sieve) I was able to get a body.

Example 3 0.8 sulfonate of higher alcohol in 100 parts by weight of water
parts by weight, 0.2 parts by weight of aliphatic alkanolamide, 0.8 parts by weight of sulfonic acid dispersant of aromatic polycyclic condensate, 0.2 parts by weight of hydroxypropyl cellulose, and 10 parts by weight of molasses.
Coal powder (100 parts by weight) was added and dissolved.
A slurry-like dispersion in which coal powder was stably dispersed at a high concentration was obtained by adding and mixing 250 parts by weight of the coal powder (passed through a mesh sieve).

Example 4 0.8 parts by weight of sulfuric ester of higher alcohol, 0.2 parts by weight of aliphatic alkanolamide, hydroxypropyl cellulose O
, z weight, and alkylaryl sulfate were mixed to obtain a slurry dispersion in a stable dispersion state.

Claims (1)

[Claims] In a slurry dispersion in which carbonaceous solid combustible material powder such as coal powder is dispersed in water and/or methanol,
A slurry-like dispersion of coal powder, etc., characterized by containing molasses in the dispersion.