JP2559251B2 - Surface treatment agent for solid fuel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to preventing adhesion or sticking of solid fuel such as coal and oil coke in handling equipment such as hoppers, coal feeding pipes and belt conveyors, and a crusher for these solid fuels. The present invention relates to a surface treatment agent for solid fuel for the purpose of improving pulverizability in the above.

(Prior art) Solid fuels such as coal and oil coke are conveyed to a crusher by a handling device such as a hopper, a coal feeding pipe, and a belt conveyor, and are crushed to an appropriate size for use. At the solid fuel storage site, water treatment is performed to prevent dust and improve the working environment.
The content of solid fuel increases in this watering, usually 8-12%,
It can be about 14-18% during precipitation.

Then, when the water content of the solid fuel becomes large in this way, the discharge property in the hopper and the coal feeding pipe deteriorates sharply, the clogging of the hopper and the coal feeding pipe occurs due to clogging, and the adhesion and belt on the belt conveyor Various problems such as dropping from the conveyor occur.

Further, the water adhering to the surface of the solid fuel increases the frictional force due to the surface tension of the solid fuel and makes the sliding of the solid fuel particles worse.
It adheres and reduces the grinding efficiency.

The conventional methods for treating solid fuels with high water content are A, B,
A so-called oiling method is used in which mineral oil such as C heavy oil is added to solid fuel such as coking coal.

Also, a method of adding a surfactant instead of mineral oil is
For example, it is reported in Japanese Examined Patent Publication No. 58-11915 and Japanese Examined Patent Publication No. 56-10892.

(Problems to be Solved by the Invention) The above-mentioned oiling method forms an oil film on the surface of solid fuel particles to reduce friction between particles to prevent adhesion and sticking in handling equipment such as hoppers and belt conveyors, and a crusher. It is intended to improve the pulverization efficiency.

However, although this method is effective to some extent when the water content of the solid fuel is as small as 6 to 8%,
In the case of coking coking coal, the amount of mineral oil added reaches 0.3 to 0.8% on a dry basis of the coking coal charged into the coke oven, so there is a risk of ignition in the transfer line, and there is a risk of mineral oil being discharged into the wastewater. There is a problem of mixing, and further, since mineral oil containing a relatively large amount of sulfur and nitrogen is used, there are problems such as generation of harmful gas and irritating odor.

Further, when mineral oil is added to a solid fuel having a water content of 8% or more, particularly 10% or more, there are problems such as clogging of the hopper and increase of adhesion to the belt conveyor.

On the other hand, the method of adding a surfactant instead of these mineral oils is to reduce the surface tension of water adhering to the surface of the solid fuel particles, thereby obtaining a lubrication effect between particles, and a handling device such as a hopper or a belt conveyor. It is intended to prevent adhesion and sticking in and to improve pulverization efficiency in the pulverizer.

In this method, an anionic surfactant, particularly a dialkyl (alkenyl) sulfosuccinate or an alkylbenzenesulfonate is used as the surfactant. However, the addition of these surfactants
Blockage in the hopper is alleviated compared to the conventional oiling system, but the expected effect is not obtained, and adhesion to the belt conveyor etc. or blockage in the hopper or crushing efficiency in the crusher etc. With regard to the above, there may be a case where the result is worse than the case without addition.

Then, this invention aims at developing the effective processing agent in solid fuels, such as coal with a high water content, and oil coke.

(Means for Solving the Problems) As a result of intensive research to solve the above problems, the present invention proposes a surface treatment agent for solid fuel containing a polyether-modified silicone oil.

The polyether-modified silicone oil used in the present invention is a compound having a silicone glycol copolymer structure and represented by the following structural formula.

Here, R: H or an alkyl group having 1 to 4 carbon atoms R ': an alkyl group having 1 to 9 carbon atoms a: 1 to 100 b: 0 to 100 and a molecular weight of about 1000 to 20000 is preferable, It is not particularly limited to this range.

Specifically, Shin-Etsu Silicone KF-35 manufactured by Shin-Etsu Chemical Co., Ltd.
1, KF-352, KF-353, KF-354, KF615, X-22-811, X-22-
812, Toray Silicone Co., Ltd. SH-3746, SH-3749, SH-
3771, SH-8400, TH-8700, SILWET manufactured by Nippon Unicar Co., Ltd.
L-77, L-720, L-722, L-5310, L-7001, L-7002, L-750
0, L-7600, L-7602, L-7004, L-7607, Y-7006, Toshiba Silicon Co., Ltd. TSF-4440, etc.

The polyether-modified silicone oil of the present invention becomes more effective when used in combination with a nonionic surfactant.

Examples of these surfactants include polyoxyethylene alkylphenol ether, polyoxyethylene alkyl ether, prolonic type, and tetronic type.

To use the treating agent of the present invention, a polyether-modified silicone oil alone or a mixture or an aqueous solution thereof is added by spraying or the like in any step from crushing of coke raw coal to charging of a furnace. Well, the amount used is the pure content of the treating agent with respect to the weight of the coking raw coal.
The range of 50 to 1000 ppm is preferable.

(Effect of the Invention) The treatment according to the present invention obtains lubricity by forming a lubricous film on the surface of the solid fuel particles and, at the same time, lowering the surface tension of water adhering to the surface of the solid fuel particles.

That is, the treating agent according to the present invention imparts lubricity to the coal particles by both the oiling method and the surfactant addition method described above. Therefore, by using the treating agent according to the present invention, the drawbacks of the oiling method and the conventional surfactant addition method can be compensated.

Therefore, according to the present invention, compared with the conventional method, it is easier and has no problem after the treatment, and it is extremely effective in preventing the hopper from being clogged, adhering to and dropping off the belt conveyor, and improving the pulverizability of the solid fuel in the pulverizer. Is.

Further, since the treating agent according to the present invention is effective in a small amount used, it has almost no effect on the operating cost, and there is no adverse effect caused by using a large amount of the treating agent as in the oiling method.

(Example) Hereinafter, the Example of this invention is shown.

[Treatment Agent] Treatment Agent of the Invention Blending Example 1 Polyether-modified silicone oil [Shin-Etsu Chemical Co., Ltd.]
Made: KF-352] 50Wt% POE (9.5) Nonylphenyl ether 50Wt% Formulation 2 Polyether-modified silicone oil [Toray Silicone Co., Ltd .: SH3746] 50Wt% Water 50Wt% Formulation 3 Polyether-modified silicone oil [ Nippon Unicar Co., Ltd .: SILWET L-7500] 30Wt% POE (9.5) Nonylphenyl ether 30Wt% Water 40Wt% Blending example 4 Polyether-modified silicone oil [Nippon Unicar Corporation: SILWET L-7602] Conventional example Comparison Example 1 A heavy oil Comparative example 2 B heavy oil Comparative example 3 POE (12) nonyl phenyl ether Comparative example 4 Sodium n-dodecylbenzene sulfonate Comparative example 5 Sodium di-octyl sulfosuccinate Comparative example 6 Naphthalene sulfonic acid formalin condensate sodium Comparative example Example 7 POE (9) nonylphenyl ether Comparative example 8 Ethylene glycol Comparative example 9 Heavy oil C Comparative example 10 Trier Tanolamine The above-mentioned treating agents were tested as shown in the following examples.

Example 1 Completely dried coal was sieved to 2.0 mm or less, a predetermined amount of water was added thereto, and the mixture was sufficiently mixed, and then the treating agent of the present invention and the conventional treating agent of the above-mentioned formulation example were added and mixed again. did. The sample 1 (5 g) thus prepared was placed evenly on the center of the stainless test piece 2 as shown in FIGS. 1 and 2, and the test piece 2 on which the sample 1 was placed in this way
Is used as the fulcrum for the motor 3 and the inclination is increased at a speed of 3 ° / sec. The inclination angle of the test piece 1 when the sample 1 slides down toward the fulcrum is read, and this test is performed in 3 to 7
The measurement was repeated, and the average value was calculated. The results are shown in Table 1.

As is clear from the test results in Table 1, it is clear that the treatment agent of the present invention containing the polyether-modified silicone oil has a particularly excellent slip promoting effect as compared with the conventional treatment agent and the case of no addition. .

Example 2 An oil coke having a particle size distribution as shown below was completely dried, and a predetermined amount of water and a treating agent were added thereto and thoroughly mixed. Was used to perform pressure molding. The compression fracture strength of this oil coke tablet was measured under the following test conditions using a Tenshiron universal testing machine manufactured by Tokyo Keiki.

[Oil coke particle size distribution] 125 μm or more 29.1% 105 to 125 μm 5.8% 74 to 105 μm 8.0% 63 to 74 μm 3.6% 44 to 63 μm 6.7% 44 μm or less 46.8% [Test conditions] Compressor descending speed 5 mm / min Pressure detection range 0 to 100 kg Test frequency 3 to 5 times The test results are shown in Table 2 below.

As is clear from the test results in Table 2, the addition of various treatment agents reduces the compressive fracture strength of the oil coke tablets, but among them, the treatment agents containing the polyether-modified silicone oil according to the present invention show a particularly remarkable decrease. It is clear that it has an excellent effect of preventing solid fuel from sticking.

Example 3 Completely dried coal is sieved to 7 mesh (2.83 mm) or less. A predetermined amount of water and each treatment agent were added to this and mixed so as to be uniform. Transfer the sample to a crusher container, crush it for a certain period of time under the following test conditions, then 200mesh (0.074m
Transfer to a sieve of m), wash thoroughly with water, perform sieving, dry and weigh to calculate 200 mesh or less.

[Test conditions] Grinding time 1 min Water content 10% Number of tests 3 times The test results are shown in Table 3 below.

From the test results of Table 3, the pulverizability of coal is improved by the addition of various treating agents, and among them, the treating agent containing the polyether-modified silicone oil according to the present invention has a particularly remarkable pulverizing-improving effect. It is clear that the crushing has an excellent effect.

[Brief description of drawings]

FIG. 1 is a side view showing the measuring method of Example 1, and FIG. 2 is a plan view of the same.

Claims (1)

(57) [Claims] 1. A surface treatment agent for a solid fuel, which contains a polyether-modified silicone oil.