Method for obtaining briquetted solid fuel using porous coal as raw material

FIELD: oil and gas industry.

SUBSTANCE: invention refers to the method for obtaining briquetted solid fuel, which can reduce the cost of briquetting at maintaining the strength of briquetted product. Mixed oil that contains heavy oil and oil-solvent, and porous coal having moisture content of 30 to 70 wt %, is mixed so that a suspension is obtained. Suspension is dehydrated by heating so that dehydrated suspension is obtained. Oil-solvent is extracted from dehydrated suspension so that the residue is obtained. The residue is heated, and oil-solvent is extracted in addition from the residue so that modified coal is obtained. Moisture is introduced to modified coal so that wet modified coal with moisture content of 3-10 wt % is obtained. At the stage of moisture introduction, crushed porous coal with moisture content of 30 to 70 wt % is mixed with modified coal. Then, wet modified coal is briquetted under pressure.

EFFECT: reduction of briquetting cost at maintaining the briquette strength.

2 cl, 3 dwg, 1 tbl, 1 ex

 

The present invention relates to a method for producing briquetted solid fuel using porous coal such as brown coal, as a source material.

Background of invention

As for the method of producing a solid fuel using porous coal such as brown coal as raw material, method of production described in Patent document 1 is known. A method of obtaining a solid fuel, as described in Patent document 1, characterized by the mixing of the mixed oil, including heavy oil component and a component of oil-solvent with the porous coal with obtaining suspensions of source material, by heating the suspension with dehydration of the porous coal and the impregnation of the pores of the porous coal with a mixed oil, including heavy oil component and oil component, a solvent, and then separating the solid material/liquid and drying of the suspension.

In a method of producing a solid fuel, as described in Patent document 1, the moisture in the pores of the porous coal is evaporated by heating the suspension of the source material (i.e. the mixture of the mixed oil, including heavy oil component and a component of oil-solvent with the porous coal).

At the same time the inner part of the pores is covered with a mixed oil including heavy component is not the tee. In the result, the pores are filled with a mixed oil, in particular, preferably, a component of heavy oil. In the adsorption of oxygen on the active sites in the pores and oxidation is suppressed, and thus suppressed the spontaneous combustion of porous coal. In addition, the pores are filled with a heavy oil component when heated, resulting in an increase in the calorific value of the porous coal. Hence, according to the method for producing a solid fuel, as described in Patent document 1, it is possible to obtain a solid fuel having a low moisture content, low ability to spontaneous combustion and increased calorific value.

However, in a method of producing a solid fuel, as described in Patent document 1, since the modified coal (solid fuel) after passing the stage of drying is in powder form, there is a problem in relation to transportation. In particular, the use of modified coal in powdered form can give the increase in the cost of transportation and may cause dust pollution due to low bulk density, precipitation during transportation and volatile losses. Therefore, it is desirable to use wooden modified coal in powdered form using a briquetting machine. In this way m is deficieny coal in powdered form may not be brication, except under high pressure. Therefore, there is the problem of reducing the cost of briquetting. It should be noted that if the strength of the briquettes is not high enough, the briquettes will be easily reduced in the process.

As the technology of briquetting modified coal in powdered form, for example, a well-known method of obtaining briquetted coal described in Patent document 2. In the production method, described in Patent document 2, the starch is introduced into the coal in powdered form, carry out the mixing and the resulting mixture bitteroot under pressure. Thus, in this way the starch used as a binder.

Patent document 1: Published unexamined Japanese patent application No. 7-233383.

Patent document 2: Published unexamined Japanese patent application No. 2003-64377.

The invention

However, in the method of briquetting described in Patent document 2, in which starch is used as a binder, you must enter the starch, and at least several percent in the coal in powdered form, and the introduction of starch in the amount of several percent is unrealistic in terms of cost briquetting.

The present invention has been made in the circumstances described above, and the present invention is the I create a method of producing briquetted solid fuel, which can reduce the cost of briquetting while maintaining the strength of the briquetted product.

As a result of diligent studies to solve the problems described above, the authors of the present invention found that by regulating the moisture content of the modified coal after the stage of drying up to 3-10% of the mass. and briquetting modified coal under pressure can be obtained briquetted product (bitterbynde solid fuel)having high strength, without the use of binders such as starch, which can solve the problems described above. The present invention is made on the basis of the specified findings.

I.e. in accordance with the present invention a method of obtaining a briquetted solid fuel includes a stage of mixing the mixed oil containing a heavy oil and oil-solvent to obtain a suspension, stage evaporation with dehydration of the suspension by heating with getting dehydrated suspension, phase separation solid/liquid separation of oil-solvent from the dehydrated slurry to obtain a residue, the stage of drying by heating the residue with additional separation of the oil-solvent from the residue with obtaining the modified coal, the stage of introducing moisture moisture in the modified coal with getting wet mo is aficionado coal with a moisture content of 3-10% of the mass. and the stage briquetting wet modified coal under pressure. Here, the term "moisture content" refers to the percentage (by weight) of water contained in the mixture of the modified coal and crushed porous coal obtained by dividing the weight of water contained in the mixture of the modified coal and crushed porous coal, the weight of the mixture. In the case where crushed porous coal is not contained, the term "moisture content" refers to the percentage (by weight) of water contained in a modified angle obtained by dividing the weight of water contained in a modified angle, the mass of the modified coal. In addition, the term "modified coal refers to coal, which was modified by reducing the percentage of moisture in order to increase the calorific value per unit mass.

In addition, in the present invention at the stage of introduction of moisture, preferably, the crushed coal is obtained by grinding the porous coal is mixed with the modified coal. Therefore, the product cost can be reduced. The reason for this is that the moisture fine coal, which is not required for modifying the processing, can be used as a means of introducing moisture at the stage of introduction of moisture. Therefore, the phase of introduction of moisture can be Ipanema simply by mixing the modified coal after modifying processing and crushed coal, which was not subjected to the modifying process, using a known device such as a mixer.

In addition, in the present invention at the stage of introduction of moisture, preferably, waste water received at the stage of evaporation, served in a modified coal. For example, waste water can be made by plating on modified charcoal. Therefore, it is possible to obtain the effect of reducing the amount of water processed by the treatment equipment and waste water installation.

Advantages

According to the present invention, thanks to its relevant characteristics, in particular, with the introduction of moisture into the modified coal, which was subjected to a stage of drying with getting wet modified coal with a moisture content of 3 to 10 wt. -%, and briquetting wet modified coal under pressure communication between particles can be enhanced. As a result, you can get bitterbynde solid fuel having high strength without the use of binders, such as starch. It is possible to reduce the cost of briquetting while maintaining the strength of the briquetted product.

Brief description of drawings

Figure 1

Figure 1 is a flow diagram of a method of obtaining a briquetted solid fuel according to a variant of the implementation of this image is to be placed, and a block diagram of a device for the production of briquetted solid fuel.

Figure 2

The figure 2 presents a graph showing the effect of mixtures of modified coal and crushed porous coal crushing strength relative to the capacity of the rolls.

Figure 3

The figure 3 presents a graph showing the relationship between the moisture content of mixtures of modified coal and crushed porous coal and the maximum crushing strength of the briquettes, which are piketirovany products.

Reference number

1 - grinding

2 - mixing plant

3 - installation pre-heating

4 - installation of evaporation

5 - set the separation of solid/liquid

6 - install the final drying

7 - installation of introducing moisture

8 - install briquetting

100 device receiving briquetted solid fuel.

The best ways of carrying out the invention

The best embodiments of the invention will be described below with reference to the drawings.

Figure 1 is a flow diagram of a method of obtaining a briquetted solid fuel according to a variant implementation of the present invention and a block diagram of the receiving device 100 briquettes solid topl the VA.

As shown in figure 1, the device 100 includes a grinding 1 for grinding the porous coal (raw material-coal), the mixing installation 2 for mixing porous coal, crushed in the grinding 1, with a mixed oil containing a heavy oil and oil-solvent, the installation of pre-heating 3 for pre-heating the suspension obtained in the mixing installation 2, installation evaporation 4 for dewatering suspensions, installation separation of solid/liquid 5 for the mechanical separation of oil-solvent from the dehydrated slurry obtained in the installation of evaporation 4, installation of the final drying 6 for heating the residue separated in the separation unit solid/liquid 5, for additional allocations of oil-solvent from the residue, the installation of introducing moisture 7 for introducing moisture into the modified coal in powder form, obtained in the final drying 6, and the installation of 8 briquetting briquetting pressure wet modified coal obtained in the setting of introducing moisture 7.

Separate stages of a method of obtaining a briquetted solid fuel according to a variant embodiment of the invention will be described in detail below.

Stage grinding

First porous ug is eh (source material-coal) is fed to the grinding 1 and milled. Here the porous coal (raw material-coal)is fed in grinding 1 (and preferably dewatering)is, for example, so-called low-grade coal having a moisture content of 30-70% of the mass. Examples of such porous coal includes lignite, lignite and polivitaminny coal. Examples of brown coal include Victorian coal, coal, North Dakota, and coal Berg. Examples polivitaminnoe coal includes coal West Bank, coal Binungan, coal Samarangana and acohol. In addition, crushed porous carbon has a particle size of, for example, about 0.05-3 mm, and the average particle size of about several hundreds of microns. In addition, % of the mass. refers to mass% (mass ratio). In addition, when you enter the porous coal (raw material-coal), originally having a small particle size, there is no need to grind the porous coal (raw material-coal).

Stage mixing

Then a mixed oil containing a heavy oil and oil-solvent, mixed with crushed porous coal in the mixing installation 2 getting the suspension. The term "heavy oil" refers to the heavy fractions, such as vacuum oil residue, which essentially has no vapor pressure at, for example, 400°C, or oil containing a large number (in particular, 50% of the mass. or b is the larger) heavy fraction. The term "oil-solvent" refers to oil that dissolves and disperses heavy oil. As the oil-solvent from the viewpoint of affinity for heavy oil, the ability to be handled as a suspension, ease of penetration into the pores, etc. is used, for example, a light fraction of crude oil. Taking into account the stability at the temperature of evaporation of moisture, it is recommended to use oil having a boiling point of 100 to 300°C. examples of the oil include kerosene, light oil and fuel oil. When mixing heavy oil and oil-solvent receive (heavy oil) containing mixed oil. When using such a (heavy oil) containing mixed oil (heavy oil) containing mixed oil shows adequate fluidity, and promoterwise penetration of oil into the pores of the porous coal.

The mixing unit 2 consists of a mixing tank for receiving and mixing the mixed oil and porous coal in the mixing vessel provided with stirrer, etc.

Stage evaporation

Then the suspension obtained in the mixing installation 2, pre-heated in the pre-heating 3 and then dehydrated in installing evaporation 4 getting dehydrated slurry. The suspension is heated, for example, up to 70-100°C in installation predvaritelnogo the heat 3 and then served in the capacity of the evaporation in the installation of evaporation 4, in which the moisture contained in the porous coal in the slurry is vaporized with dehydration of the suspension. Simultaneously with the drying processing of the pores of the porous coal impregnated with the mixed oil, the pores preferably are filled with a heavy oil component. In addition, the moisture contained in the porous coal in suspension is unloaded from the installation evaporation 4 as waste water.

Installing a pre-heater 3 comprises a heat exchanger, etc. Installation evaporating comprises evaporating capacity to produce the suspension obtained in the mixing tank 2, and the evaporation of moisture from the slurry, and the evaporation capacity provided by the agitator, heat exchanger for heating the suspensions, etc. as a heat exchanger used Novotrubny the heat exchanger, a plate type heat exchanger, spiral heat exchanger type, etc.

Phase separation solid/liquid

Then the oil-solvent is mechanically separated from the dehydrated slurry to obtain a residue. Dehydrated slurry fed into the separator solid/fluid separation unit solid/liquid 5 and subjected to separation of solid/liquid. As a separator of a solid material/liquid, for example from the point of view of improving separation efficiency, use of a centrifugal separator, to the torus dehydrated slurry is separated into a residue and the oil-solvent by centrifugal separation. You can also use the separator solid/liquid, which uses the method of sedimentation, filtration method, the method of push-UPS or similar.

Stage drying

The remainder allocated to phase separation solid/liquid is still wet because of the mixed oil. Therefore, the residue is heated in the final drying 6 with additional separation of the oil-solvent. Therefore, the remainder is transformed into a modified coal in powdered form. A final drying 6 consists of dryers, gas fridge, etc. as a dryer, use the dryer can heat the object to be processed in continuous transportation of the processed object inside, and, for example, dryer type steam pipe having a lot of steam heating tubes arranged in the longitudinal direction on the inner surface of the drum.

The residue is heated in the dryer, and oil component, in particular a component of oil-solvent, the residue is evaporated. The evaporated component of the oil-solvent is transferred by the carrier gas from the dryer to the gas refrigerator. Component oil-solvent, transferred to the gas cooler, is condensed in the gas refrigerator and retrieved.

Stage recycling

The oil-solvent, selected and extracted from obasogie the Noah suspension or balance, in the separation unit solid/liquid 5, and the final drying 6, returned as recycled oil in a mixing installation 2. The oil-solvent returned to the mixing plant 2, is re-used for the adjustment of the suspension in the mixing installation 2. In addition, the recycled oil is returned into the mixing installation 2 consists mainly of a component of oil-solvent, but recycled oil contains negligible amounts of heavy oil component.

Stage of introducing moisture

Moisture is introduced into the modified coal in powder form, obtained at the stage of drying, to obtain the modified wet coal with a moisture content of 3-10% of the mass. in the installation of introducing moisture 7. To introduce moisture into the modified coal, there are at least two ways. In the first method, moisture is introduced by mixing the source material of the porous coal, crushed in the grinding 1, with modified coal in powdered form, unloaded from the installation of the final drying 6. In this way modified wet coal is a mixture of modified coal obtained at the stage of drying, and crushed the source material is porous carbon. I.e. wet modified coal contains not only the modified coal obtained at the stage of drying, but also crushed the source material until the sty coal. In the second method, moisture is injected by spraying waste water from the plant evaporation 4 on the modified coal in powdered form, unloaded from the installation of the final drying 6. Can use only one of these two ways, or can use both methods in combination. Alternatively, moisture may be introduced into the modified coal in powdered form in a different way than the methods described above.

Installation of introducing moisture 7 consists of a tank of introducing moisture for receiving and mixing the modified coal in powdered form, and capacity of the introduction of moisture provided by the mixer, etc.

Stage briquetting

Then wet the modified coal with a moisture content of 3-10% of the mass. bitteroot under pressure in the installation briquetting 8. Modified coal, briquetted into briquettes, used as a briquetted solid fuel. Installation briquetting 8 consists of two briquetting machine, etc.

In the method of obtaining a briquetted solid fuel according to a variant implementation of the invention in the briquetting solid fuels instead of binder used low-cost water, in particular waste water discharged in the production method, and therefore the cost of briquetting is reduced. In addition, when vydergivanie the moisture content in a given volume, such as described above may be retained strength briquetted product.

Example

Next, we describe experimental results on briquetting of modified coal. In this experiment receive the modified coal with different moisture content and examine the effect of moisture content on bitterweet. In this experiment, the moisture introduced by mixing powdered starting material is porous coal with modified coal in powder form, obtained at the stage of drying. First of all, the degree of mixing crushed porous coal with modified coal obtained at the stage of drying, the moisture content of the mixture of the modified coal and crushed porous coal is shown in table 1.

Table 1
The degree of mixing crushed porous coal (%)010203050100
The moisture content of the mixture (%)0,03,16,19,215,430,7

The moisture content of the crushed porous coal as source material separately is 30.7%. In addition, in table 1 in a mixture, in which the degree of mixing crushed porous coal is 100%, the proportion of the modified coal obtained at the stage of drying is 0, and the proportion of crushed porous coal is 100%. In addition, in a mixture, in which the degree of mixing crushed porous coal is 0%, the proportion of the modified coal obtained at the stage of drying, 100%, and the proportion of crushed porous coal is 0.

Further, when six samples shown in table 1, bitteroot under pressure using a twin roll briquetting machine, the ratio between the crushing strength of bricks and power rolls per unit speed twin roll briquetting machine is shown in figure 2. The figure 2 presents a graph showing the influence of the moisture content of the mixture of the modified coal and crushed porous coal crushing strength relative to the power rolls. In figure 2 the shaded diamond, shaded square and the shaded triangles represent the data samples, in which the moisture content of the mixture is 0%, 3.1% and 6.1 percent, respectively, and statusevent triangle, statusevent square and nisato ewenny diamond represent the data samples, in which the moisture content of the mixture is 9.2%, 15.4% and 30.7 percent, respectively.

As shown in figure 2, the crushing strength of the pellets relative to the power rolls per unit number of revolutions of the rolls is increased as the mixing ratio increases when the degree of mixing crushed porous coal with modified coal up to 30% (the moisture content of the mixture is to 9.2%). However, when the blend is 50% and 100% (the moisture content of the mixture is 15.4% and 30.7%), because the power rollers exceeds a certain value, the crushing strength of the pellets tends to decrease. I.e. when the mixing rate is 50% and 100% (the moisture content of the mixture is 15.4% and 30.7%), crushing strength of briquettes does not increase enough in comparison with other samples.

In addition, as regards the effect of reducing the power of the rolls by mixing crushed porous coal, for example, to get the bricks with crushing strength of 10 kg, power rolls about 0.18 kg/rpm (extrapolated value) is required in the case of the modified coal separately (degree of mixing crushed porous coal 0%). When the degree of mixing crushed porous coal with modified coal is 30% (the moisture content of the mixture of 9.2%), the power rollers about 0.4 kg/rpm, that gives a power saving of about 20%. It should be noted that when the power of the rolls increases, the increased pressure in the briquetting pressure.

As described above, in the case of the modified coal separately (degree of mixing crushed porous coal 0%) value of the power rollers for producing briquettes with crushing strength of 10 kg was found by extrapolation. The reason for this is that in the case of the modified coal separately (degree of mixing crushed porous coal 0%), even if the capacity of the rolls increases to about 0,16 kW/rpm or more, it is impossible to obtain pellets with good bitterweet.

Next on the figure 3 shows the maximum crushing strength of briquettes implemented in mixes with different moisture content by changing the power rolls per unit speed twin roll briquetting machine. The figure 3 presents a graph showing the relationship between the moisture content of mixtures of modified coal and crushed porous coal and the maximum crushing strength of the briquettes, which are piketirovany products.

As shown in figure 3, when the moisture content of mixtures of modified coal and crushed porous coal is 3-10 wt. -%, maximum strength rasdall is of briquettes exceeds 20 kg

As described above, with the introduction of moisture into the modified coal, which was subjected to a stage of drying, to obtain the modified wet coal with a moisture content of 3 to 10 wt. -%, and briquetting wet modified coal under pressure communication between particles can be increased. As a result, you can get bitterbynde solid fuel having high strength, without the use of binders, such as starch. It is possible to reduce the cost of briquetting while maintaining the strength of the briquettes.

In addition, when using powdered starting material is porous coal in powdered form in order to introduce moisture into the modified coal, the number of porous coal processed at the stage of mixing, at the stage of drying is reduced. When the number of porous coal processed at the stage of mixing, at the stage of drying is reduced, decreasing the amount consumed a mixed oil containing a heavy oil and oil-solvent, and it is possible to reduce the capacity of the equipment in the individual stages. Thus, it can be reduced the cost of obtaining briquetted solid fuel.

In addition, when using waste water from the plant evaporation 4 to introduce moisture into the modified coal, you can reduce the amount of waste water discharged from sistemy a result, the cost of processing waste water, unloaded from the system, may be reduced, leading to a reduction in the cost of getting a briquetted solid fuel at the facility as a whole.

The above-described embodiments of the present invention. However, it should be clear that the present invention is not limited to the above options, and various changes in the scope of the invention described in the claims.

1. A method of obtaining a briquetted solid fuel that contains:
stage mixing - mixing a mixed oil containing a heavy oil and oil-solvent with the porous coal with a moisture content of from 30 to 70 wt.% and grinding to obtain a suspension;
stage evaporation - dehydration of the suspension by heating with getting dehydrated slurry;
phase separation solid/liquid - separation of oil-solvent from the dehydrated slurry to obtain a residue;
stage of drying and heating the residue for additional allocations of oil-solvent from the residue in powdered form with the receipt of the modified coal;
the stage of introduction of moisture - introduction of moisture into the modified coal with getting wet modified coal with a moisture content of 3-10 wt.%;
stage briquetting briquetting wet modified coal under pressure and
at the stage of introduction of moisture and melendy coal, obtained by grinding the porous coal with a moisture content of from 30 to 70 wt.% mix with modified coal.

2. A method of obtaining a briquetted solid fuel according to claim 1, in which at the stage of introduction of moisture and waste water received at the stage of evaporation, served in a modified coal.



 

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FIELD: technological processes; metallurgy.

SUBSTANCE: invention may be used for recycling of chemical-recovery production wastes. Coal sludges are loaded in molds 1 of transporter 2 and supplied to furnace 3, where they are thermally treated. Briquetting is done without binding agent, and thermal treatment is carried out at the temperature of 330-390 °C for 120-40 minutes.

EFFECT: reduction of prime cost and increase of briquettes mechanical strength.

1 tbl, 1 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to the field of production of hard fuel of organic origin, namely, to formation of agglomerated fuel from wastes of carbon-containing materials. The method includes mechanical action on raw material with gradual increase in loading and its volume compression. During mechanical action raw material is grinded until viscous-plastic state is obtained. The device includes loading bin, cylinder-cone frame, auger shaft with transporting and pressing blades and has longitudinal protrusions located along the frame on its inner surface and a row of dies, each of being fixed in the frame at a distance from each other, with an auger shaft passed through the central holes of the latter.

EFFECT: increase in degree of fuel plasticity and strength whatever the original raw material without any hardening agents and additives and higher productivity of device.

2 cl, 1 tbl, 2 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to method and system for briquetting powder materials, for instance, moisture-containing, bituminous and semi-bituminous coals, without using binding agent. Method (versions) includes stages, at which powder material, probably, is partly dried, and supplied into briquetting device in conditions, when condensed gas is introduced into briquetting device at the time of supply or in conditions, when water vapour is released from powder material during supply. Briquettes are formed in briquetting section of briquetting device, where briquettes are formed from powder material in conditions that lead to condensation of gas component, reducing in that way, pressure growth during briquette formation. Invention also includes system (versions) for briquetting powder materials according to two methods stated above.

EFFECT: reduction of gas inrush during formation of coal dust into briquette.

52 cl, 1 tbl, 4 dwg

The invention relates to the field of briquetting of minerals, in particular to the technology of briquetting coal and anthracite coal, and can be used in the coal mining and coal processing industry

The invention relates to the processing of coal, concrete to a method of producing fuel briquettes, and can be used in coal, mining, chemical and other industries, as well as for domestic fuel

FIELD: chemistry.

SUBSTANCE: invention relates to method and system for briquetting powder materials, for instance, moisture-containing, bituminous and semi-bituminous coals, without using binding agent. Method (versions) includes stages, at which powder material, probably, is partly dried, and supplied into briquetting device in conditions, when condensed gas is introduced into briquetting device at the time of supply or in conditions, when water vapour is released from powder material during supply. Briquettes are formed in briquetting section of briquetting device, where briquettes are formed from powder material in conditions that lead to condensation of gas component, reducing in that way, pressure growth during briquette formation. Invention also includes system (versions) for briquetting powder materials according to two methods stated above.

EFFECT: reduction of gas inrush during formation of coal dust into briquette.

52 cl, 1 tbl, 4 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to the field of production of hard fuel of organic origin, namely, to formation of agglomerated fuel from wastes of carbon-containing materials. The method includes mechanical action on raw material with gradual increase in loading and its volume compression. During mechanical action raw material is grinded until viscous-plastic state is obtained. The device includes loading bin, cylinder-cone frame, auger shaft with transporting and pressing blades and has longitudinal protrusions located along the frame on its inner surface and a row of dies, each of being fixed in the frame at a distance from each other, with an auger shaft passed through the central holes of the latter.

EFFECT: increase in degree of fuel plasticity and strength whatever the original raw material without any hardening agents and additives and higher productivity of device.

2 cl, 1 tbl, 2 dwg

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