JPS588794A - Mixed fuel - Google Patents

Abstract

PURPOSE:A mixed fuel with excellent prolonged stability and fluidity, prepd. by mixing coal, oil and water with superfine silica as a dispersion stabilizer. CONSTITUTION:A coal such as anthracite or bituminous coal of which 100% moiety passes a 100 mesh screen, pref. 80-90% moiety passes a 200 mesh screen, an oil such as heavy fuel oil, water and superfine silica are uniformly mixed at normal temp. A mixed fuel oil with dispersion stability and good fluidity is readily obtd. at a low cost, wherein it is pref. to mix the coal and the oil in a wt. ratio of 3/7-7/3 and to use 0.1-10wt% superfine silica and 0.1- 20wt% water.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mixed fuel with long-term stability and good flowability.

In recent years, oil prices have soared, and various alternative energy sources are being explored. Among them is colloid fuel, which is a mixture of pulverized coal and oil. If you simply mix pulverized coal in oil, the pulverized coal will immediately settle out, as shown by the Stokes equation.To prevent this, there is a method of adding water and a surfactant to the coal/oil mixture. JP-A-54-40809, etc.) and a method of ultra-finely pulverizing coal and dispersing it in oil (JP-A-54-40809, etc.)
40808) etc. are shown horizontally. However, the surfactant addition method is often economically problematic because the amount of surfactant added is large, while the method of ultra-finely pulverizing coal poses the risk of dust explosions and requires a large amount of energy for pulverization. In addition, dispersion stability and fluidity are not always sufficient in either case.

In view of the above-mentioned circumstances, the inventors of the present invention have conducted intensive research and have completed a mixed fuel that has fluidity and long-term stability suitable for mass transportation by tankers and pipelines.

That is, the present invention is a mixed fuel consisting of 1 coal heavy oil, water, and ultrafine particulate silica.

The coal used in the present invention may be of various types, such as anthracite, bituminous coal, and brown coal. Its particle size is 100 mesh sieved.
If it's 0, it's good, but it's good to pass 1 sieve and 200 mesh sieves.
0-90 is good. If the particle size is coarser than this, the coal will settle, and if it is crushed to ultra-fine particles, for example, 5μ271 or less, there is a risk of coal dust explosion, and it is disadvantageous in terms of cost per gram.

The mixing ratio of coal and oil varies depending on the type and particle size of the coal, the oil content, and the required stability and fluidity, but in general, the coal/oil weight ratio is in the range of 3/7 to 7/3. It's good to choose. Of course, fluidity and stability are good even if the amount of coal mixed is less than 3/7, but from the original meaning of mixed fuel, it is no longer economically advantageous. Also 7
If coal is mixed in at a ratio of /3 or more, the viscosity becomes too high and the fluidity decreases, making it impractical.

Since water acts with the ultrafine particulate silica in the mixed screw material of the present invention and contributes to the formation of the network structure described below, it must be present in the mixed fuel. Its content is approximately o, i~20 for the entire dish! m-%.

At a ratio of less than 0.1, no network structure is formed, and at a ratio of 2 or more, the transportation and storage costs are high due to the volume of water.
This is a good thing because the amount of heat generated per unit volume also decreases.

This water is brought in with coal, oil, and super-fi+fi particulate silica! Either f or θ1 water may be added.

The particulate silica particles used in the present invention are particles with an oil diameter of about 40 μm or less, and refer to a mixture or compound containing about 60 or more 8i02. Examples of the particulate silica include (1) Super easy to use ferrosilicon as raw material 1
Secondary particulate anhydrous silica (Aerosil ■manufactured by Nippon Aerosil Co., Ltd.) (2) Concentrated colloidal silica (3)
There are silica gel particles of approximately 40 μm or less.
・0 The most preferred of these. Ultrafine particulate anhydrous silica. .

The reason why the ultra-high-density particulate silica is an effective fractional stabilizer for the mixed fuel of the present invention is not certain, but the reason is that the particulate silica interacts with water in oil to form a network structure. , is thought to prevent coal from settling.

The amount of ultrafine particulate silica added varies depending on the type of coal, its particle size, oil type, and the required degree of stability and fluidity, but generally it is at least about 0.1 silica in the mixture. It has no effect unless added. Desirably, it is about 0.5 to 10 weights ff1-Z. 0.1%
At lower temperatures, the stability is poor, and at higher temperatures than 10 cm, the effect is the same even if more is added, which is economically disadvantageous.

The mixed fuel of the present invention can be obtained by homogeneously mixing oil, water, coal, and ultrafine particulate silica at room temperature. By adding coal and mixing it uniformly,
It is possible to obtain a mixed fuel with better dispersion stability, such as 3 degrees or more, which is cheap, simple, and has dispersion stability.

We were able to obtain a mixed fuel with good fluidity.

The present invention will be explained in more detail below with reference to Examples. In addition, the numerical value within 0 and the heavy phase % with respect to the total amount in %d are shown in the examples, and the viscosity is a value determined using a rotational viscosity meter at a rotor speed of 21 rotations and 12 rpm.

Example 1 Heavy oil 120 f with specific gravity o at 70°C, 92, viscosity 30 cps, and heat release l of 10500 K Cat/V4
(47,25) in a water bath at about 70'C, TKK
Separately add AEJ%08IL while stirring with a homomixer.
(Manufactured by Nippon Aerosil Co., Ltd.

Grade name aoo, OX 50, TT 600
, MOXso, R972's 511jJillV)
1.3 F (0,5) dispersed in water 12.8 F (5) fAtJ Mixed in heavy oil, 10-15
The dispersion was then stirred and dispersed for a minute. Next, Australian Hunter Valley charcoal was added to the dispersion using a new centrifugal crusher ZM-
1, mixed with 12Or (47,25) of pulverized coal obtained by crushing it with a screen hole diameter of 0.25 mm,
The mixture was stirred and dispersed for ~30 minutes to obtain a mixed fuel. The viscosity of this product at 70°C is grade 300.

370 cps, OX 50 (7) at 340 c
ps, TT 600@, 330 cps
, 340 cps at MOX 80, R97
2, it was 340 cps.

Next, this mixed fuel fc was put into a measuring cylinder of 500 cc and subjected to a storage stability test for 150 hours in a hot water bath at about 70°C.

After 15 days, divide into upper layer, middle layer, and lower layer and heat each layer to 70℃.
The viscosity and specific gravity were measured. The results are shown in Table-1 Table-1 Example 2 AE L using the electric oil and fine charcoal used in Example 1
, (,OS I L■ (manufactured by Nippon Aerosil Co., Ltd.) of each yuzu grade, colloidal silica and silica gel in an amount of about 20μ
A mixed fuel was obtained in the same manner as in Example 1 by changing the addition ratio, the weight ratio of added water, and the coal/oil. It was placed in a sedimentation tube with a height of about 200 mm and left in a hot water bath for 7 days.

The results are shown in Table 2.

Fuck -2 Note: ○: Both fluidity and stability are good. ×: Poor flow, dynamics, and stability. Δ　Liquidity, low JE property is slightly inferior Patent applicant: Asahi Kasei Industries, Ltd.

Claims (1)

[Scope of Claims] 1. Mixed fuel made from coal, oil, water, and ultra wIIIM childlike silica. 2. The amount of particulate silica is 0.1 to 10% by weight, according to claim 1. Mixed fuel 3, the world of water,
Mixed fuel 4 according to claim 1, wherein the oil is 0.1 to 20% by weight.Claim 1, wherein the oil is heavy oil or crude oil.
Mixed fuel 5 described in Section 5, the mixing ratio of coal and oil is 3/7 to 7/3 by weight
The mixed fuel according to claim 1 which is