JPS59204690A - Stabilizer for mixed fuel - Google Patents

Abstract

PURPOSE:A stabilizer for mixed fuel that contains, as an active ingredient, a polyether derivative of a specific alkylene oxide adduct, thus giving the fuel high stability in long-term standing, mechanical stability, fluidity and storage stability at high temperatures. CONSTITUTION:The objective stabilizer contains, as an active ingredient, a polyether derivative resulting from reaction between (A) a polyether of an adduct of an alkylene oxides containing ethylene oxide as an essential component to an N6-300 polyalkylenimine or its derivative and (B) a 7-23C fatty acid. The stabilizer is added to a mixed fuel generally in an amount of 0.01-0.15wt%, preferably 0.05-0.125wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a stabilizer for mixed fuel of fine coal powder and fuel oil,
In addition to long-term static stability, it is a stable fuel used to create mixed fuels that have good mechanical stability and fluidity, and also have excellent storage stability at high temperatures. Regarding drugs.

In recent years, the price of petroleum fuel, which is the most important energy source, has soared, and the limits of oil reserves have become acutely recognized, so securing a long-term energy source has become an important issue in energy policy. For this reason, fif is used as an energy source along with oil.
IK's thick coal is once again attracting attention.

However, in the case of coal, unlike liquid petroleum,
Since it is a lump, it has the drawbacks of high transportation and storage costs (and also extremely inconvenience in handling). A method of dispersing it in fuel oil and using it as a slurry fuel is being studied extensively.Coal/oil mixed fuel dispersed in finely recycled fuel oil has a higher unit density than one dispersed in water. Since the calorific value of R is large, there are various problems such as whether it is preferable as a source of industrial energy or whether it is suitable for practical use.

Thermal power plants, such as turtles, require large amounts of fuel, and such large amounts of fuel are commonly transported and stored by tankers or by large land tanks. Coal/oil mixed fuel is subjected to various external forces during each process from production to combustion, such as fuel transfer, tank storage, and transportation, such as shearing force caused by transfer pumps such as centrifugal pumps and screw pumps, Such silver machines are subjected to mechanical forces such as side agitation of storage tanks, refluidization agitation of fuel discharged from tanks, vibration during ship transportation, and homogenization agitation before combustion to maintain a constant calorific value. There is a problem that the coal in the mixed fuel separates and tends to cause sedimentation consolidation phenomenon after a long history, and the mixed fuel that has undergone sedimentation and consolidation loses fluidity, and in practice its handling is similar to that of Ogawa Noh.Therefore, coal In order to put a /oil mixed fuel into practical use, it is necessary to improve not only the static stability during storage but also the mechanical stability and fluidity.

JP-A No. 53-55305, No. 54-52105, No. 54
-52105, 54-53107, 57-1654
Patent No. 90 discloses polyether compounds containing polyfulkylene oxide groups as stabilizers for mixed fuels. However, the performance of such compounds requires a large amount of addition to achieve the effect, and the storage temperature of the mixed fuel is 7.
A major drawback was that it required storage conditions of 0° C. or lower and a cage-like condition. In terms of support, if the amount added is too large, it is economically disadvantageous and the economic benefits of the mixed fuel are lost. In addition, since the storage temperature cannot be kept at a high temperature (above 70°C), the viscosity is high (it is not possible to increase the coal porosity, which is also economical. Also, it is safe to leave it standing still). This means that it is difficult to transport the mixed fuel by tanker (which is subject to long-term vibrations such as rolling and pitching).Such phenomena pose a major obstacle to the practical application of mixed fuel. was.

The inventors of the present invention have conducted intensive research to improve these drawbacks, and the polyfulkylene imine mata has been developed by esterifying a polyether compound in which fullkylene oxide is added to 14 of the polyether compounds with fatty acids, thereby reducing the addition of relatively small amounts of polyfulkylene imine. The present invention was achieved by discovering that it exhibits excellent effects regardless of the amount and exhibits revolutionary performance that is independent of particle size distribution, adjustment conditions, etc.

This is thought to be because the addition of a hydrophobic furkyl group to the end of the molecule through an ester bond improves affinity with the hydrophobic part of the coal surface, dramatically improving adsorption onto the coal surface. It will be done.

The dispersion stabilizer of the present invention is obtained by adding a fullylene oxide containing ethylene oxide as an essential component to a polyfulkylene imine containing 6 to 300 yatom atoms or a derivative thereof, and in which the total weight of the polyoxyethylene chain portion is the total molecular weight. 4~
50%, and the molecular weight is i o, o o o
~600,000 polyether compound obtained by reacting a fatty acid with a polyether compound as an active ingredient [Contains 1f! : It is expressed as a percentage.

A polyether compound can be easily obtained by adding fullkylene oxide, which essentially contains ethylene oxide, to a polyalkylene imine or a derivative thereof by a conventional method.

In particular, a pull or partially block adduct of ethylene oxide and globylene oxide is preferred, and the order of addition may be in any order, but propylene oxide (hereinafter abbreviated as po) is added first. Is dispersion stability better when ethylene oxide (hereinafter abbreviated as Eo) is added? show.

Next, a polyether compound derivative is obtained by reacting these polyether compounds with a fatty acid by a conventional method. The fatty acid to be destemmed preferably has a carbon number of 7 to 26, but the number of double bonds is , there is no effect on the performance of branching.

The molecular weight of the polyether compound is 10,000 to 600,
OD O, preferably 15,000 to 400.00
It is 0. Also of the sum of the parts of the polyoxyethylene chain!
The M lid is 4-50 i% of the total molecular weight.

The stabilizer of the present invention is 0.01 to 0.15 for mixed fuel.
By adding 0.05% to 0.125% of Japanese silkworms, preferably 0.05 to 0.125% of Japanese silkworms, coal particles can be stably dispersed in fuel oil.

Furthermore, the mixed fuel to which the stabilizer of the present invention has been added has a storage temperature of L70.
Even at l'iJ of ~150°C, the stability was good for more than 3 months, and the stability was extremely good even under adverse conditions such as propeller stirring immediately after the can production.

In addition to the above-mentioned effective number of 5 minutes, the stabilizer of the present invention can be used depending on the thickness of the core.
Other surfactants can be added.

In order to disperse VC in coal-depleted coal using the stabilizer of the present invention, for example, the stabilizer may be dissolved in fuel oil and then mixed with pulverized coal, or the stabilizer may be added to a mixture of pulverized coal and fuel oil. It may be added and mixed.

The vortex f for rapidly mixing the stabilizer of the present invention is optional, for example, at 50 to 150°C 7). The heating pressure may be normal pressure, but it may be reduced pressure to avoid deaeration of the mixed fuel.

As a mixed fuel component, various coals such as coal, anthracite, bituminous coal, lignite, etc. are used, and the average particle size is usually less than 100 microns, preferably 200 μm.
0 mesh sieve passing Mb'a% or more is preferable. As the heavy oil, any hydrogen ash oil such as crude oil, heavy oil, light oil, or kanlin can be used, but from an economic point of view, it is best to use crude oil or heavy oil.

The mixing ratio of coal and oil in the blended fuel depends on the required fluidity, stability and storage temperature.

In the stabilizers disclosed so far, the storage temperature is limited to around 70°C, so the coal concentration has been limited to 50 to 60 wt%. In other words, when it exceeds 60 wt%, the viscosity increases rapidly and fluidity is lost. However, the stabilizer of the present invention has a temperature of 70°C to 1
The coal concentration should be set at 60~ because the high temperature storage stability of 50℃ is affected.
It became possible to increase it to zowt%.

When producing a coal/oil mixed fuel consisting of pulverized coal, fuel oil, and stabilizer using the stabilizer of the present invention, the addition method of each component, the tilt order, the stirrer and stirring conditions for mixing, etc. is not restricted as long as the action of the stabilizer is not particularly inhibited.

Next, the present invention will be explained in further detail with reference to examples. still,
Both "part" and "U%" shown in the examples are based on the amount taken.

Example Middle East heavy oil*' iso, 4y (contained in the oil, excluding filtration water) was placed in a 500 ml container and poured into a container according to Table 1-
1 and 1-2, add the prescribed lids of each yuzumei A (j) and immerse them in an oil bath at 100°C.
aooJ! (excluding the moisture in the coal) is added to the above Middle East heavy oil. Middle East heavy oil contains K O, 03%, and Belmont coal contains K 3.25% water.
Coal (dry)/(Middle East heavy oil tanker water) = 6o/4o
(KM ratio) and 7.

In other words, the total value of water contained in oil and coal is 19.5
It is 5.9. 1 container containing oil containing stabilizer and stone R+
When immersed in an oil bath at 00°C for 1 hour, the temperature becomes constant.

Using a lab mixer (Tokushu Kikako), mix the coal and straw mixture at a constant temperature of 600 rpm at 6000 rpm.
Stir for a minute. Next, replace the agitator with a propeller blade,
72F#Pl at 90 rpm! A mixed fuel that had been stirred for 1 PIt and given a mechanical history was prepared and subjected to a stability test at 7C.

The stability test soap test device is a stainless steel cylinder with an inner diameter of 5.3 mm and a diameter of 24 mm.
An IIL having a stopper outlet for fluid at each position is used. Pour a certain amount of the various mixed fuels prepared as above into this cylinder from the bottom up to 18 mm, and
Place in a constant temperature bath at 0°C and stand still for 90 days. After 90 days have elapsed, remove the stopper at the 12- position from the bottom of the cylinder and remove the mixed fuel above it (i.e., at a height of 12-1 from the bottom).
The mixed fuel in the cylinder of B-9r was taken out and used as an upper layer sample, and its coal jealousy was determined. The stopcock located 6 meters from the bottom of the eKK was 'J' L. The mixed fuel above this position was taken out and its coal density was measured as a middle layer sample.

Finally, the remaining mixed fuel was removed from the bottle, and the coal was used as a sample of the lower layer. The measurement of coal density is based on mixed fuel K.
1,1.1-)! Add J dichlorothane and add real oil y
= f & tiles, and the remaining lime content was increased by the ratio of the remaining lime content to the initial mixed fuel Vζ. These polished rice varieties are shown in Table 2. The smaller the difference in right leg concentration in each layer, the better the mechanical stability and performance of the mixed fuel.

*1: Middle East heavy oil (produced in the Middle East):

Claims (1)

[Claims] 1. An alkylene oxide containing ethylene oxide as an essential component is added to a polyfulkylene imine containing 6 to 600 nitrogen atoms or a derivative thereof, and the total weight of the polyoxyethylene chain portions or the total molecular weight is The active ingredient is a polyether compound derivative obtained by adding a fatty acid to a polyether compound having a molecular weight of 10,000 to 600,000.
Stabilizer for mixed fuel with special characteristics. 2. Polyalkyleneimine or its derivative is a reaction product of polyethylene polyamine and ethyleneimine, and/
The stabilizer according to claim 1, which is polyethyleneimine, which is a polymer of ethyleneimine. 3. The stabilizer for mixed fuel according to claim 1, which is a polyether compound derivative or a block-like or partially block-like adduct of ethylene oxide and an alkylene oxide other than ethylene oxide. 4. The stabilizer for mixed fuel according to claim 1, 2 or 3, wherein the fullkylene oxide in the polyether compound is ethylene oxide and propylene oxide.