JPS61213288A - Oil coke briquette and production thereof - Google Patents

Abstract

PURPOSE:To obtain the titled briquette with low ash content useful as a fuel for a household stove, by adjusting oil coke powder to proper water content, pressing it by a primary press, blending it with polyvinyl alcohol and molding it by a secondary press. CONSTITUTION:(A) Oil coke powder is adjusted to proper water content. The prepared oil coke powder is pressed by a primary press process. The oil coke powder is blended with 0.1-5wt% calculated as solid content of polyvinyl alcohol as an aqueous solution. The prepared blend is pressed and molded by a secondary press process. Then, the prepared molded article is dried, to give oil coke briquette.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for producing oil coke sprinkets and coke, particularly for use as fuel in household stoves, etc., with low ash content, water resistance, abrasion resistance, and pressure expansion resistance. This invention relates to an oil coke sprinket with excellent properties and a method for producing the same.

[Prior art and its problems]

The main fuels for general household heating include kerosene, coal, coal coke, and oil coke lumps, each of which has its advantages and disadvantages. For example, kerosene is a clean fuel that is easy to handle and does not pollute the inside of the home, but it is expensive, and although it is a fuel, it has the drawbacks of producing soot and ash.

Oil coke lump, which is the same solid fuel, has the same advantages as coal and coal coke, and has the additional advantage of generating almost no soot or ash. However, oil coke lumps tend to generate fine powder due to friction and QK during handling, and this fine powder has the disadvantage that the environment is degraded.

In addition, the same problems as those for general household use exist in the case of each type of oak business.

Various methods for producing briquettes have been proposed. For example, when turning coal into briquettes, you can press it under high pressure, use cement, hitch, tar, wood, etc.
Alternatively, there is a method of molding by adding a binder such as pulp waste liquid, CMC1 starch, etc., or by combining heating.Also, when making coal coke or oil coke into briquettes, it is not possible to mold it by itself. There are methods such as adding the above-mentioned binder and, in some cases, using heating in combination.

However, these methods have the following problems.

Briquettes made of coal coke and oil coke using pitch and tar as binders have low strength and can break if handled with care. Also, when burned in a household stove, soot and smoke are generated, polluting the environment, and when chimneys are cleaned, even more soot and smoke is generated. Also pitch,
Since tar contains carcinogenic substances, it is necessary to take measures against the working environment during briquette manufacturing.

Briquettes, which use wood such as bark or chips as a binder for coal and oil coke, have low abrasion strength.
The amount of powder produced is low when blowfishing, and there is a large amount of unburned material being sent to the bottom of the dumpling.Furthermore, it has poor water resistance, so it must be stored and managed in bags.

Nolde effluent, blackstrap molasses, starchy, CMC as a binder for coal coke and oil coke.

Briquettes made with gelatin or the like have poor water resistance and require the same consideration as wood binders. Further, the amount of binder added in order to maintain strength sufficient for practical use varies depending on the type of binder, but it is necessary to add a large amount, and there are few binders that satisfy both the required performance and economical efficiency.

Briquettes that use inorganic substances such as cement as a binder for coal coke and oil coke have the disadvantage that the inorganic substances derived from the binder generate talin ker during combustion, causing a shelving phenomenon, and increasing ash content. .

[Means for solving problems]

In order to take advantage of the advantages of oil coke and solve the above-mentioned drawbacks, the present inventor conducted various studies on briquetting oil coke, and found that impurities contained in oil coke were reduced to zelipinyl alcohol ( It promotes gelation of PVA) and has a strong binding effect when brigette is formed, and raw materials such as particle size and moisture of oil coke and its processing means,
For example, by improving the process by applying high pressure to the raw material in two or more stages, such as the raw material crushing process (primary press) using a double roll press, etc., and the molding process (secondary press) using a high-pressure double roll forming machine (secondary press), oil coke can be produced. The present invention was achieved based on the knowledge that a strong oil coke sprinket that generates less fine powder than lumps and has excellent water resistance can be obtained.

That is, the present invention provides a molded product in which the produced component is oil and loss, and the binder is polyvinyl alcohol, and furthermore, the binder has a weight content of 0.1 to 5 in terms of solid content relative to oil coke. It is an oil coke sprinket (first batch 8A) that has excellent water resistance, abrasion resistance, and crush resistance, and when producing a compact by adding polyvinyl alcohol as a binder to oil coke powder,
(a) Moisture adjustment step of adjusting the water content of oil coke powder, (b) Primary pressing step of pressurizing the oil coke powder obtained in the first step, (,) Powdered oil coke obtained in the above steps Against? A mixing step of adding and mixing 0.1 to 5 weight of ribinyl alcohol in terms of solid content as an 11iI liquid of water, (d) a secondary pressing step of press-molding the mixture obtained in the @ step, (・) This is a method (second invention) for producing an oil coke sprinket having excellent water resistance, abrasion resistance, and crush resistance, which is obtained by combining each step of the drying step of drying the molded product obtained in step d.

The present invention will be explained in more detail below. Ru.

The first aspect of the present invention is a briquette made of oil coke as a product, containing a small amount of PVA, and reacting with impurities (for example, vanadium) in the oil coke.

The oil coke sprinket of the present invention has high crushing strength and abrasion strength, generates little powder during nodding, and is water resistant, so it can be stored outdoors and generates no heat when burned in a home stove. It has the excellent effects of producing a large amount of soot, producing little soot, less unburned material falling from the rosdol, and producing almost no ash.

Next, the manufacturing method of the present invention will be explained.

To summarize the characteristics of the manufacturing method of the present invention, (1) oil coke is used as a raw material and the moisture content is adjusted, (2) PVA is used as a binder, (3) pressing is performed in two or more stages. This is intended to produce an oil coke sprinket that has excellent effects such as water resistance, abrasion resistance, and crush resistance.

The total water content of commercially available oil coke powder is adjusted to 10 to 15% by weight.

The reason for doing this is that if the moisture content is too high, problems such as adhesion or hanging may occur in each step, while if the moisture content is too low, the plasticity will be low, which is undesirable.

Next, a first press is performed.The reason for the first press is to remove air bubbles from the oil coke, and an omniscient press such as a double roll Sores is used as the pressing device.Press Although a small amount of PVA may be added at the time, it is preferable to add it in the form of an aqueous solution because it can be mixed uniformly.Oil coke is crushed in the crushing process of the primary press.The particle size is as shown in the example. Third
As shown in the table, it is sufficient to have an average particle size of 1 cm or less and a maximum particle size of about 5 cm.Put the oil coke powder obtained by the above 5K in a mixer, and add the PVA aqueous solution to the oil coke powder (anhydrous). 0.1 to 5 g in terms of solid content
Add and mix in an amount of 0.5 to 1.01, preferably 0.5 to 1.01.

In this case, as mentioned above, it is preferable to add in an aqueous solution in order to add it uniformly.

In addition, the total water content in the oil coke powder is 10
-20xJIk%, preferably 12-17111%. The PVA used in the present invention may be any commercially available PVA, and one with high adhesive strength is preferred.

In the present invention, the reason why PVA is used as a binder is as follows.
Impurities in oil coke, i.e. trace amounts of inorganic substances such as vanadium, have a catalytic effect on the gelation of PVA and crosslink PVA, thereby improving the water resistance, abrasion resistance and crush resistance of oil coke sprinkets. This is because it improves performance. This effect was first discovered by the present inventor and is unique to oil coke, which is different from other national fuels. If the amount of PVA is too small, there will be no effect, and if it is too large, it will not only be expensive but also have a high viscosity, resulting in poor workability and is not practical.

The reason why the water content is set to 10 to moILms is the same as the above-mentioned reason.

Further, if necessary, thoroughly knead the mixture using a 7-wheel mill or the like. The oil coke thoroughly mixed in this manner is subjected to secondary pressing into a molded product using a molding machine, such as a high-pressure membrane roll type molding machine, which produces briquettes of a desired shape. By drying this, the briquette of the present invention can be obtained. Further, the secondary press molded product is dried or not dried at a temperature of 50 to 12
By heat embedding at 0° C., water resistance is further improved and desired physical properties can be obtained in a short period of time, which greatly contributes to improving biomass properties.

Conventional methods require a temperature of 200°C to make PVA water resistant.
The above heat treatment was required, but in the present invention, PVA can be gelled even at temperatures below 100°C due to the catalytic action of impurities in oil coke, making it possible to further improve the physical properties of briquettes. can.

Example 1 Fixed carbon 88.4%, volatile content 11.2%, ash content 0.4%
The oil coke having a total moisture content of 10% was then subjected to primary pressing in a double roll press.

(The press machine used was the same machine ■3.7 EK press machine) This was put into the mortar mixer again, and PVA (Im Kagaku, product name "K-24EJ 1") was added to the oil coke.
Add 3 parts of 5° of 2% solution and mix for 1 minute.
Further, the mixture was kneaded for about 2 minutes using a Fretsu 1 mil. This is then molded into two parts using a high-pressure double roll molding machine used for the
This was then pressed to produce 32×32×19 briquettes.

This was dried in an atmosphere of 100° C. for 2 hours, and the crushing strength of the briquette was 4:30.

Further, the fine powder generation rate (1) in the drop test was as shown in Table 1. For comparison, the fine powder generation rate (rust) from a drop test of oil coke lumps is also shown in the same table.

The fine powder generation rate was measured by dropping a 10 Kf bag of oil coke or oil coke lumps five times from a height of 1 m onto a 12 mm thick iron plate, and then determining the amount of sieve drop of 2 mm. In addition, the particle size of the raw material oil coke and the particle size distribution of the oil coke when first pressed using a double roll press are shown in Table WJ2 and Table 3, respectively.

The average particle size of the raw material and long-pressed product is 2.6, respectively.
It was 3 and 0.8-.

Table 2 Table 3 (N amount qb) Example 2 The same procedure as in Example 1 was carried out except that the amount of binder added was changed. The results are shown in Table 4, and Experiment 11L
The analytical values of ash content of No. 2 are shown in Table 5.

For comparison, Table 4 shows the results of producing briquettes using the method of Example 1, but omitting the addition of water and the primary pressing step.

(Note 1) (1) Five briquettes were placed in a beaker containing 300 ml of water, and after being left for 7 days, the briquettes were removed from the beaker and immediately after that, the crush fg1 degree was measured.

(2) After putting 5Kf of the product into Hokuei's heat dissipation type oil coke and burning it for 6 hours, the ash i% rate was calculated by dividing the total amount of ash and unburned material falling under the Rossdol by 5Kf. The ratio and ash amount are the ratio obtained by dividing the ash amount in the above test and the total remaining amount after burning unburned fallen materials by 5 by 4.

(Note 2) Experiment NIL2.4.5 shows an example, and the others show comparative examples.

(Note 3) The binder PVA has a saponification degree of 98 molti and an average degree of 1 molti 240.
0 electrochemistry@Product name “Denka l-ni-1 24gJ”
, CMC was a product of Shin-Etsu Chemical, PC was a product of Denki Kagaku ■ trade name "Denka Biltland Cement", and pitch was medium pitch made by Kansai Kagaku.

Table 5 (!Amount %) [Effects of the invention] 1. The product of the present invention is made by adding PVA to oil coke powder and has excellent water resistance, abrasion resistance, and crush resistance 1-1. fiL'''C also does not disintegrate and does not turn into powder even when stored outdoors and pressurized.

2. The method of the present invention is based on the moisture content of oil coke and the binder P.
By specifying the amount of VA and the pressure molding means, the above physical properties can be effectively obtained.

Patent Applicant Hinode Chemical Industry Co., Ltd. Procedural Amendment April 24, 1985 Director General of the Patent Office Manabu Shiga 1, Case Description 1985 Patent Application No. 53242 2, Title of Invention Oil Coke Sprinket and its Production Law 3, Relationship with the case of the person making the amendment Patent applicant address: 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Column 5 of the detailed explanation of the invention in the specification, Contents of amendment 5-1) Page 4 of the specification In line 13, ``low'' is corrected to ``high.''

5-2) Page 11 of the specification, lines 13-14 ``(Electrochemistry, trade name RX-24EJ)'' was changed to ``(Electrification procedure amendment June 1985] 9th, Mr. Manabu Shiga, Commissioner of the Patent Office. l Display of the case 1985 Patent Application No. 53242 2 Name of the invention Oil coke sprinket and its manufacturing method 3 Person making amendments Relationship to the case Patent applicant address 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Details Contents of amendment in Column 5 of Detailed Description of the Invention of the Book

Claims (1)

[Scope of Claims] 1. A molded product whose product is oil coke and whose binder is polyvinyl alcohol, and in which the binder is 0.1 to 5% by weight in terms of solid content based on the oil coke. Oil coke sprinket with excellent water resistance, abrasion resistance and crush resistance. 2. When adding polyvinyl alcohol as a binder to oil coke powder and producing a compact under pressure, (
a) a moisture adjustment step of adjusting the moisture content of the oil coke powder; (b) a primary pressing step of pressurizing the oil coke powder obtained in step a; (c) a step of pressurizing the oil coke powder obtained in step b. On the other hand, a mixing step of adding and mixing polyvinyl alcohol in the form of an aqueous solution of 0.1 to 5% by weight in terms of solid content, (d) a secondary pressing step of press-molding the mixture obtained in step c, and (e) a secondary pressing step of press-molding the mixture obtained in step c. A method for producing an oil coke sprinket with excellent water resistance, abrasion resistance, and crush resistance, which is obtained by combining the steps of drying the molded product obtained in step d.