JPS60115692A - Preparation of mixed coal/petroleum fuel - Google Patents

Abstract

PURPOSE:To reduce power consumption and prepare a mixed fuel with high coal concn., by crushing a part of raw material coal in a wet grinder with heavy fuel oil, crushing the remaining portion of the coal in a dry grinder and mixing the two crushed coals. CONSTITUTION:Coal is crushed in a crusher 1 and heavy fuel oil and, when necessary, about 0.0001-2.0wt% (based on the coal) additive are added to it. The mixt. is conditioned to a coal concn. of 10-55wt% and is fed into a first grinder 2 for pulverization to such an extent that particles samller than 200 mesh may account for 50-100wt%. A remaining portion of the coal is added to a coal/heavy fuel oil slurry coming out of the first grinder 2 and the mixt. is pulverized to such an extent that paeticles smaller than 200 mesh may account for 50-100wt%. When necessary, an additive is added in an amt. of about 0.0001-2.0wt% (based on the coal) and the mixt. is fed into a mixer 4 to produce a mixed coal/petroleum fuel in which particles smaller than 200 mesh account for about 50-100wt%.

Description

Detailed Description of the Invention The present invention involves pulverizing coal in parallel with two or more pulverizers and mixing it with heavy oil and additives as necessary to produce a coal/petroleum mixed fuel. It's about how to do it.

In recent years, due to the instability of oil supplies, technological development for effectively utilizing coal has been progressing. As one of these, research is being put into practical use using a coal/petroleum mixed fuel made by mixing coal and petroleum into a nullary form. However, conventional methods for producing coal/oil mixed fuel usually involve pulverizing coal into fine powder and mixing it with heavy oil at the same time, resulting in a large power unit and the inability to increase the coal concentration to over 59 wt%. I have this problem.

In view of the above points, the present inventors have carried out intensive research on the method for producing a coal/oil mixed fuel, and have found that when producing a coal/oil mixed fuel with the same coal concentration and particle size, the coal
By pulverizing the product in parallel with multiple pulverizers and then mixing it, compared to the conventional manufacturing method using a single-stage pulverizer,
The power consumption can be reduced by around 10%, and the coal concentration can be reduced to 2~
It was discovered that it was possible to manufacture a product with 10 wt% higher content, and the present invention was completed.

That is, the method of the present invention involves adding heavy oil or heavy oil and additives to coal to produce coal/petroleum mixed fuel. The raw coal is introduced into a plurality of wet pulverizers for pulverization, and the remainder of the coking coal is introduced into one or more dry pulverizers for pulverization.
The slurry from the wet pulverizer and the pulverized coal from the dry pulverizer are introduced into a mixer with or without additives and mixed, and the coal concentration is 50~lowt% below 200 mesh and 4Qwt% or above. The feature is that it can be adjusted as desired.

Hereinafter, the configuration of the present invention will be explained based on the drawings.

FIG. 1 shows, as an example, a case where two crushers are used. In Figure 1, coal is crushed by a hammer crusher,
After coarsely pulverizing with a coarse pulverizer 1 such as a Joe crusher,
Heavy oil is added to a portion of the coarsely pulverized coal, and 0.00% of additives are added as necessary.
01-2. QWt, % (per ″A coal), preferably 0
．． Adding 1 to 1.0 wt% of O (based on coal) and adjusting the coal concentration to 10 to 55 wt%, preferably aO to 5 Qwt%, supplying it to the first crusher 2 of a ball mill, rod mill, cage mill, or roller mill, 200 mesh or less is 50-100wt%, preferably 70-95Vtl
Finely pulverize to t%. Next, the remainder of the coarsely pulverized coal is added to the lime/heavy oil slurry obtained from the output 1 of the first pulverizer 2 and pulverized in a second pulverizer 3 such as a ball mill mill to obtain 50 to 100 wt% of 200 mesh or less. Quickly 60~9Qwt
In addition to adding crushed coal adjusted to and the coal concentration is 40 to 8Q wt%, preferably 55 to 75w.
t% and supplied to the mixer 4, and mix them to adjust the content of 200 mesh or less to 50 to 100 wt%, preferably 60 to 9Q'wt%, to produce a product coal/petroleum mixed fuel. 5 is a dryer for drying the coarsely pulverized coal to be supplied to the second pulverizer 3. This dryer may be provided integrally with the second crusher 3. Furthermore, the first crusher 2
, the temperature inside the second crusher 3 and mixer 4 is 40 to 110°C.
1 Heating and adjusting to preferably 60 to 90°C. In some cases, the coal/oil mixed fuel from the mixer 4 is introduced into another mixer 6 such as a line mixer, and additives are added as necessary to produce a more stable coal/oil mixed fuel.

As the heavy oil used in the present invention, C heavy oil, B cancellation oil, atmospheric residual oil, heavy crude oil, etc. are suitable.

The additives used in the present invention include anionic, cationic, and nonionic surfactants, which may be used alone or in combination, and are appropriately selected depending on the type of coal. Specifically, the AJ-based surfactant 1 bioagent includes fatty oil + llie acid ENTEL salt, higher alcohol sulfate ENT/V salt, nonionic ether sulfate ester salt,
Olefin sulfate entele salt, alkylarylnulfone sulfonate, dialkyl sulfonate <M salt, acyl sarcosinate, alkylene algium)V(alkylphenol)v) sulfate ester salt, alkyl phosphoric acid ester salt,
Sial Killless I + / = l = M hard ester degree, acrylic acid moshikuha / and maleic anhydride copolymer, polycyclic aromatic sulfonated compound or formalin compound, etc. are used, and cationic surface activity 〈υ ,
Argyl amine salts, quaternary amine salts, etc. are used, and nonionic surfactants include polyoxyalkyl ether, polyoxyethylene alkyl phenol ether, oxyethylene/oxypropylene block polymer, and polyoxyethylene alkylene ether. Ruamine, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, alkyl 1-limethylammonium chloride, alkyldimethylbensylammonium chloride pyridinium salt, polyoxyethylene fatty acid varnish 7 t
v, IIM Aliphatic alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether ethanolamide, etc. are used, and as the amphoteric surfactant, alkyl betaine etc. are used. ,1
Amine compounds such as 7'tl, 2, and 3 monoamines, cyamine, higher argylamine hydrochloric acid, etc. are used.

Next, Examples and Comparative Examples of the Present Invention will be described. After coarsely pulverizing the coal shown in the following table to 9 Q wt% or less,
The coal concentration is 5 Q.
C heavy oil at 90°C was added to the coal to give a concentration of 0.2 wt%, and a nonionic dispersant was added to the coal to give a total of 0.2 wt%, and the particles were pulverized using a ball mill to adjust the particle size to 35 wt% below 200 mesh. It turned into slurry. On the other hand, the remainder of the coarsely pulverized coal (25
wt%) in a dry ball mill. It was supplied at a rate of 0 kq/h and pulverized to less than 200 meshes and 65 wt%. Next, the above slurry and dry coating (1 and 9
0.2 wt % of nonionic dispersant was added and mixed (feeding several times, and these were stirred and mixed for a residence time of 15 minutes to obtain a product coal/petroleum mixed fuel at a rate of 210 kq/h.

The product has a coal concentration of 57wt% and a viscosity of 750c at 90°C.
It was p. The power consumption rate was 81KWh/T. Furthermore, when the viscosity was measured while changing the coal concentration, the results were as shown in FIG.

Comparative example Coal with the same properties as the example was 3 zqrn or less 90 wt%
After coarsely crushing the coal, C heavy oil at 90 °C was added to the entire coarsely pulverized coal so that the coal concentration was 50 wt%, and a nonionic dispersant was added to the lime at 0.2 wt%.
After adding and feeding a total of 180 kg/h to a ball mill, the fine powder I4'=Sh2oo mesh or less 8
.

Adjust the particle size to wt% and make a slurry to make coal/stone products.
lh mixed fuel was obtained. Product viscosity is 90'O at 90'C
Cp, power consumption is 84. It was OK KWh/T.

When the viscosity was measured while varying the coal concentration, the viscosity was as shown in Figure 2.

From the Examples and Comparative Examples, it is clear that according to the method of the present invention, the power consumption rate can be reduced by about 8.8%, and the viscosity of the product can be significantly reduced with the same coal concentration.

[Brief explanation of drawings]

Fig. 1 shows a flowchart showing an embodiment of the method for producing coal/petroleum mixed fuel viscosity 1 of the present invention, and Fig. 2 shows the relationship between coal concentration and viscosity in one example. This is Kula 7 as shown. ■ ・・・wa1 powder ii] ya (ku, 2 ・・'yu 1 minute crush (戊, 3 ・2nd 1 minute Gya) ku, 4... mixer, 5
...Dry controller, 6...Mixed search applicant: Kawasaki Heavy Industries Co., Ltd., 3 JJ, 7 people, Ben J] JJ, Makoto Shiide - Kidney.叉-′

Claims (1)

[Claims] 1. When producing a coal/petroleum mixed fuel by adding heavy oil or heavy oil and additives to coal, a part of the raw material coal is introduced into one or more wet crushers together with heavy oil or heavy oil and additives and pulverized. , the remainder of the coking coal is introduced into one or more dry crushers for crushing, and the slurry from the wet crusher and the ground coal from the dry crusher are introduced into a mixer with or without additives. A method for producing a coal/petroleum mixed fuel, which comprises mixing and adjusting the coal concentration to be 50 to 100 wt% of 200 mesh or less and 40 wt% or more.