KR20070025945A - A bulk density improving agent of raw charcoals for manufacturing cokes, a bulk density improving method of raw charcoals for manufacturing cokes, and a method of manufacturing cokes - Google Patents

Abstract

A technology which can uniformly mix raw coals with a chemical agent(bulk density improving agent) although a mixer is not used, and is able to improve bulk density of the raw coals although the concerned water content is not removed from raw coals with increased water content is provided. A bulk density improving agent of raw charcoals for manufacturing cokes is characterized in that a viscosity of the bulk density improving agent is adjusted to a range of 10 to 45 mPaÀs. The bulk density improving agent comprises at least dialkyl sulfosuccinate or its salt, or a polyoxyethylene-based addition polymer or its salt. A bulk density improving method of raw charcoals for manufacturing cokes comprises adding a chemical agent of which viscosity is adjusted to a range of 10 to 45 mPaÀs to the raw charcoals for manufacturing cokes. A method of manufacturing cokes comprises: performing a pre-treatment process of improving bulk density of raw coals to be injected into a coke oven; and injecting the pre-treated raw coals into the coke oven, wherein the pre-treatment process is performed by adding a bulk density improving agent of which viscosity is adjusted to a range of 10 to 45 mPaÀs to the raw charcoals for manufacturing cokes.

Description

BULK DENSITY IMPROVING AGENT OF RAW CHARCOALS FOR MANUFACTURING COKES, A BULK DENSITY IMPROVING METHOD OF RAW CHARCOALS FOR MANUFACTURING COKES, AND A METHOD OF MANUFACTURING COACHES

1 is a flowchart of a main process of typical coke production according to the present invention.

TECHNICAL FIELD This invention relates to the technique for improving the bulk density (volume, volume) of the raw coal for manufacture of cokes. More specifically, the present invention relates to a technique for improving the bulk density of coke-making coking coal by adding a chemical adjusted to a predetermined viscosity to the coking coking coal.

Coke is a porous carbonaceous material obtained by drying coal in a high temperature furnace (hereinafter referred to as a coke furnace). It is used as a heat source or fuel for the production of iron and castings.

Since the cost of coke occupies a major part of cost in steelmaking etc., improvement efforts are being made to reduce coke cost by improving productivity in coke production at present.

For example, some pre-treatment is performed on the raw coal (hereinafter referred to as raw coal) to improve the bulk density of the raw coal, so that an attempt is made to increase productivity by increasing the amount of raw coal put into the coke oven. Getting lost.

As a representative example of the bulk density improvement technology of raw coal, a technique of forming an oil film on raw coal to reduce friction between raw coal particles (oiling method), and classifying the raw coal in advance before entering the coke oven A technique for adjusting the particle size (see Patent Document 1) and dialkyl sulfosuccinate in the raw coal in order to lower the surface tension of water adhering to the raw coal particle surface to impart lubricity between the raw coal particles. The technique of adding surfactant, such as (dialkyl sulfosuccinate), is known (for example, refer patent document 2).

Patent Document 1: Japanese Patent Application Laid-Open No. 2003-226879.

Patent Document 2: Japanese Patent Application Laid-Open No. 2-240194.

In the technique of adding a drug for the purpose of improving the bulk density to the raw coal, the desired bulk density improvement effect is not sufficiently exhibited unless the drug and the raw coal are mixed uniformly. For this reason, the mixing apparatus (mixer) for mixing a raw coal and a chemical | medical agent uniformly may be employ | adopted. However, this mixing device increases the cost of equipment related to coke production and takes time for uniform mixing, which is a factor of lowering productivity.

Further, in the coke production facility, an apparatus for the purpose of improving the bulk density is often provided by assuming the use of raw coal which has been wetted with rain and increased in water, and evaporating the moisture of the raw coal. However, if water is removed from the raw coal, particularly in the aged coke oven, clogging of the raw coal occurs, and as a result, there is a problem that the coke productivity deteriorates.

Therefore, the present invention can improve the bulk density of the raw coal even without using the mixing device, even if the raw coal and the drug (volume density improving agent) can be uniformly mixed, and the raw coal with increased moisture is not treated to remove the moisture. The main purpose is to provide the technology that can be.

This invention provides the bulk density improving agent of the raw coal for coke manufacture characterized by first adjusting to viscosity 10-45 mPa * s. It is important for this bulk density improving agent to have a viscosity in the above range, and the specific pharmaceutical material thereof is not particularly limited, but for example, at least dialkyl sulfosuccinate or a salt thereof, or polyoxy A drug having an interfacial action including an ethylene-based addition polymer or a salt thereof can be employed. In addition, in this invention, a "viscosity" is a value determined by the method prescribed | regulated to JISK-7117-1, and measurement temperature shall be 25 degree | times.

Next, this invention provides the bulk density improvement method of the coking coal for coke manufacture characterized by adding the chemical | medical agent adjusted to the viscosity 10-45 mPa * s to the coking coal for coal production. Although the method of adding a chemical | medical agent to the raw coal for coke manufacture is not specifically limited, The method of spraying etc. which can mix a chemical | medical agent more uniformly with raw coal is preferable.

In addition, the present invention provides a coke production method in which the raw coal is added to the coke oven after performing a pretreatment step of improving the bulk density of the raw coal put into the coke oven, wherein the bulk density enhancer adjusted to a viscosity of 10 to 45 mPa · s in the pretreatment step. It provides a method for producing coke designed to add to the raw coal. In particular, the present invention provides a coke production method that does not use a mixing device of a chemical agent (volume density improving agent) and raw coal and a coke production method that can shorten the mixing time.

(Optimum embodiment)

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described. Embodiment described below shows the suitable example which concerns on this invention, and this invention is not narrowly limited by these illustrated embodiment.

1 is a flowchart of a typical coke production main process according to the present invention.

Raw coal used for coke production is imported, and stored in a predetermined place in the open air (see "Low coal" in Fig. 1). The raw coal is returned to the coke production site from the low coal and undergoes a pretreatment step. In this pretreatment step, after the pulverization is performed to make the size of the raw coal uniform, it flows into the coke oven through a conveying device such as a belt conveyor to dry matter. Carbonized coking is released as a coke product after the fire treatment has been carried out. The launching sites are typically steel production sites and casting manufacturing sites. The dry gas (not shown in the figure) generated in the dry distillation process is sent to a predetermined desulfurization apparatus for treatment, followed by deammonia treatment and the like.

Here, in this invention, the chemical | medical agent adjusted to predetermined viscosity is added with respect to the raw coal before a grinding | pulverization process is performed in the said pretreatment process. The purpose of the chemical addition in this pretreatment step is to improve the productivity of the coke by improving the bulk density of the raw coal and increasing the amount (volume) of the raw coal put into the subsequent coke furnace.

Suitable viscosity of the drug is 10 to 45 mPa · s. If the viscosity is less than 10 mPa · s, the bulk density may not be sufficiently improved. If the viscosity exceeds 45 mPa · s, the fluidity of the raw coal decreases, causing clogging in the coke oven, which may cause a decrease in productivity. There is a possibility.

When the agent to be used is a surfactant, the agent exhibits the effect of improving the bulk density of the raw coal by lowering the surface tension of water adhering to the surface of the raw coal particles to impart lubricity between the raw coal particles.

More specifically, since the moisture adhering to the surface of the raw coal particles inhibits the access between the particles, the higher the moisture of the raw coal, the tendency for the bulk density of the raw coal to be put into the coke oven is lowered. The chemical agent provided has an effect of relieving the repulsive force of moisture on the surface of the raw coal particles to make the raw coal particles easily accessible.

Moreover, since the chemical | medical agent (volume density improving agent) which concerns on this invention is adjusted to viscosity 10-45 mPa * s, it is excellent in the mixing dispersibility with respect to raw coal. For this reason, the said effect can be exhibited uniformly over the raw coal. In the present invention, the mixing device (mixer) of the chemicals and the raw coal is not particularly required, but the mixing time can be significantly shortened by using the mixing device.

Illustrating a part of the chemical | medical agent which can be employ | adopted by this invention, anion surfactant is mentioned first. In particular, dialkyl sulfo succinate or its salt, which is an anionic surfactant, is effective for improving the bulk density of raw coal particles having a relatively large size having a particle diameter of 1 mm or more. Dialkyl sulfosuccinate salts include, for example, sodium salts, ammonium salts, potassium salts, triethanolamine salts and the like, but sodium salts and triethanolamine salts are particularly effective. As for alkyl group carbon number of dialkyl sulfosuccinate, 8-16 are suitable.

In addition, a nonionic surfactant may be employed as a drug for improving the bulk density of the raw coal. In particular, nonionic surfactants are suitable for improving the bulk density of raw coal particles having a relatively small size having a particle diameter of less than 1 mm, and polyoxyethylene (POE) addition polymers are particularly suitable. For example, addition mole number is 2-5, and salts, such as the sodium salt, ammonium salt, and potassium salt, can be employ | adopted. In the case of employing polyoxyethylene alkyl ether (general structural formula: RO- (CH ₂ CH ₂ O) nH), as a raw material of the constituent alkyl group moiety, for example, dovanol, diadol ( and synthetic alcohols such as diadol), cetanol, and aliphatic alcohols having 12 to 18 carbon atoms. Moreover, you may mix and use a dialkyl sulfo succinate, its salt, a polyoxyethylene addition polymer, or its salt in ratio suitable for the purpose. Finally, in the present invention, it is important to keep the viscosity of the drug within the range of 10 to 45 mPa · s.

Although the addition amount of a chemical | medical agent should just select suitably according to the property of raw coal, For example, it is preferable to add so that it may become 0.01 to 0.1 weight% with respect to the raw coal weight (dry state). If it is less than 0.01 weight%, since the addition amount is too small and it becomes difficult to contact uniformly with raw coal, there exists a possibility that the improvement of a bulk density cannot be achieved partially. On the other hand, when it exceeds 0.1 weight%, the tendency of the bulk density improvement effect will reach a limit, and the additional cost by over addition becomes a problem.

Although the method of adding a chemical | medical agent is not specifically limited, The method of uniformly disperse | distributing and mixing a chemical | medical agent in a raw coal is preferable, For example, it is suitable to employ | adopt the method of spraying a chemical toward the raw coal conveyed on a belt conveyor and conveyed. Do.

The chemical | medical agent (volume density improving agent) of 10-45 mPa * s of viscosity which concerns on this invention is widely disperse | distributed to the raw coal surface by the said spraying method, and is mixed uniformly throughout the raw coal, even if it does not use a mixing apparatus. In addition, since the chemicals are quickly and uniformly mixed with the raw coal, the time for mixing adjustment in the process using a conventional mixing device can be significantly shortened or reduced, thus contributing to productivity improvement from such a viewpoint. do.

(Example)

Hereinafter, although this invention is demonstrated in detail based on an Example, this invention is not restrict | limited by these Examples.

Example 1

Test method: 10 kg of test coal (Australia charcoal, saraji, water 9.1% moisture), ground and adjusted to have a particle size distribution of 3 mm or less in advance, 70% ) 60 cm wide and 10 cm thick. The test bombs are placed in this way because it is assumed that the raw coal is conveyed by the belt conveyor.

Next, a predetermined amount is sprayed through a small flow rate nozzle which sprays various chemical liquids with different viscosities (volume density improving agent, see Table 1) in a fan shape toward the test bomb. Then, the mixture was mixed for a predetermined time with a mortar mixer.

Subsequently, the test bomb was dropped at a height of 50 cm into a 10 L container, and the bulk density was calculated by measuring the weight of the test bullet into the container. The results are shown in Table 1 below. In addition, the "volume density improvement rate" in Table 1 was calculated | required based on the following calculation formula (1).

`` Formula 1 ''

Table 1

As can be seen from the results shown in Table 1 above, when dialkyl sulfosuccinate sodium, POE oleyl ether and sulfate thereof are used as a medicine (volume density improving agent), the viscosity is 10, In the test example with 28, 30, 33, and 43 mPa * s, the bulk density improvement rate was high.

In particular, the bulk density improvement could be effectively achieved even if the mixer was mixed for only 1 minute (see Test Examples 2 to 4, 7, 8, 12, 13). As can be seen by comparing the data of the bulk density improvement of Test Examples 2 and 16, Test Examples 3 and 17, Test Examples 4 and 18, Test Examples 8 and 22, Test Examples 12 and 24, and Test Examples 13 and 25, When using a chemical agent such as dialkyl sulfosuccinate sodium, POE oleyl ether sulfate, POE oleyl ether adjusted to a viscosity in the range of 10 to 45 mPa · s, the mixing time is about 1 minute. A bulk density improvement of approximately equal to or greater than this 15 minutes was achieved.

Accordingly, it has been found that the bulk density improving agent according to the present invention can obtain a high bulk density improvement rate even if the raw coal has a high moisture content, such as test coal, and can sufficiently improve the bulk density of the raw coal even if a short time mixer is mixed.

Example 2

Using the same test bombs (raw coal) as in Example 1, the test bombs were loaded onto a belt conveyor having a width of 30 cm and a length of 10 m, and each dialkyl sulfo stone adjusted to a viscosity of 10, 30, 52 mPa · s through a sprayer. Sodium cyanate was sprayed. The test shot arriving at the end of the belt conveyor in the direction of travel was dropped at a height of 50 cm into a capacity 10 L container, and the bulk density and the bulk density improvement rate were calculated by measuring the weight of the test bomb entering the container. The results are shown in Table 2 below.

Table 2

As can be seen from the results shown in Table 2, only by spraying sodium (dialm) sulfosuccinate having a viscosity of 10 mPa · s or 30 mPa · s to the test coal (raw coal) loaded on the belt conveyor. In other words, it can be seen that the bulk density of the raw coal can be effectively improved without mixing the mixer (see Table 2).

On the other hand, dialkyl sulfosuccinate sodium having a viscosity of 52 mPa · s (comparative example) was the same spraying method, but the bulk density improvement rate was not comparable to that of the viscosity of 10 mPa · s or 30 mPa · s of dialkyl sulfosuccinate sodium (“ See Table 2).

From the test result concerning Example 2, when the chemical | medical agent (volume density improving agent) which concerns on this invention whose viscosity was adjusted to the predetermined range is used, the said chemical | medical agent on a belt conveyor for putting a raw coal into a coke oven in coke manufacture is used. The bulk density of the raw coal can be improved by a simple method of spraying. As a result, the amount (volume, volume) of the raw coal to be put into the coke oven can be increased, so that the coke production efficiency can be improved.

In this invention, even if a mixing apparatus is not specifically used, the uniform mixing of a raw coal and a chemical | medical agent (volume density improving agent) can be achieved by using the bulk density improving agent adjusted to the viscosity 10-45 mPa * s. In addition, by using the bulk density improving agent, even if the raw coal has increased water, the bulk density of the raw coal can be improved without prior treatment of the water. In the case where the water is removed, even if residual water is present, the bulk density of the raw coal can be further improved.

Therefore, this invention can be used as a technique for improving the bulk density of the raw coal for coke manufacture, and also as a production efficiency improvement technique in coke manufacture.

Claims (4)

Volume density improver of the raw coal for cokes manufacture characterized by adjusting the viscosity to 10-45 mPa * s. The method of claim 1, A bulk density improving agent for coking coal, comprising at least dialkyl sulfosuccinate or a salt thereof, or a polyoxyethylene-based addition polymer or a salt thereof. A method of improving the bulk density of coking coal, characterized by adding a chemical adjusted to a viscosity of 10 to 45 mPa · s to the coking coal. In the coke production method in which the raw coal is placed in the coke oven after a pretreatment step of improving the bulk density of the raw coal put into the cokes furnace, In the said pretreatment process, the bulk density improving agent adjusted to the viscosity of 10-45 mPa * s is added to the said coke manufacturing raw coal.

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