WO2011016602A1

WO2011016602A1 - Method for reforming low rank coal, and apparatus thereof

Info

Publication number: WO2011016602A1
Application number: PCT/KR2009/006879
Authority: WO
Inventors: 신희영; 배인국
Original assignee: 한국지질자원연구원
Priority date: 2009-08-07
Filing date: 2009-11-23
Publication date: 2011-02-10

Abstract

The present invention provides a method for reforming low rank coal and an apparatus thereof for improving the quality of low rank coal containing a large amount of ash and moisture and for inhibiting spontaneous combustion. The method for reforming low rank coal according to the present invention comprises the pulverization and separation step of pulverizing low rank coal in water by friction and separating fixed carbon, the dehydration step of dehydrating the pulverized fixed carbon, and the volatile matters removal step of removing the volatile matters fixed on the fixed carbon by mutual rubbing of the fixed carbon. In addition, the apparatus for reforming low rank coal according to the present invention comprises: an attrition mill which pulverizes low rank coal through the friction with a plurality of friction balls; and a mill for removing the volatile matters fixed on the fixed carbon by milling the fixed carbon discharged from the attrition mill through the friction with a steel sphere or a steel rod.

Description

Low grade coal reforming method and low grade coal reformer

The present invention relates to a coal reforming method and a reforming device, and in particular, a low grade coal reforming method and a low grade to isolate high-quality and to suppress spontaneous ignition by separating only the fixed carbon powder from low-grade coal having a high content of ash, water and volatile matter. It relates to a coal reformer.

As the price of crude oil has exploded in recent years, efforts to secure energy sources that can replace crude oil are increasing. Research into new energy sources that can replace existing fossil fuels such as solar energy and bioenergy is being actively conducted, but there are still many limitations in industrial use. Recently, the demand for coal is increasing again, and since most coal mines have been abandoned in Korea, coal has been imported from overseas such as Australia and Indonesia to satisfy the demand.

Imported coal is mostly used for energy generation of thermal power plants, but recently, it has escaped from the combustion of coal itself to produce liquefied gas from coal or solve environmental problems through coal gas combined cycle power generation. Plans are being tried.

As in the conventional method, high-grade coal such as anthracite coal and bituminous coal should be used to directly burn coal for thermal power generation, and anthracite coal and bituminous coal having low ash content should also be used to produce liquefied gas using coal. In other words, there is a lot of constraints on thermal power generation or liquefaction gas using so-called low grade coal, which has a relatively high calorific value compared to anthracite and the like because of high ash content and water content.

However, in the amount of coal imported from foreign countries such as Australia, Indonesia, and China, imports of low-grade coal, which is used as auxiliary coal, is increasing in order to save ordinary expenses. Therefore, low-grade coal is used to clean coal such as liquefied gas. Technological development for the production of vigorously underway, but the situation is not getting satisfactory results.

Therefore, prior to attempting to produce liquefied gas using low grade coal directly, it is expected to produce higher quality coal clean fuel by using high quality coal.

Moreover, high quality coal can be used directly for thermal power generation or mixed with anthracite or bituminous coal for thermal power generation. Therefore, there is an urgent need to develop a method for high quality coal for low grade coal.

On the other hand, as described above, all low-grade coal is imported from Australia, Indonesia, etc., but low-grade coal is high in the weight and volume of the high moisture content is not beneficial in logistics, due to the volatilized nature There is a problem that ignition occurs easily and is not easy to move.

Therefore, from the viewpoint of economics and stability of logistics, there is an urgent need to develop a method and apparatus for degrading low grade coal and suppressing spontaneous ignition.

The present invention is to solve the above problems, to remove ash, volatiles and water from low-grade coal and to increase the content of the fixed carbon powder to high-quality coal, low grade coal with improved structure to suppress spontaneous ignition The purpose is to provide a reforming method and a low grade coal reformer.

The low grade coal reforming method according to the present invention is for the high quality of low grade coal including fixed carbon powder, ash, volatile powder and water, and sorting the low grade coal by friction in water to select fixed carbon powder. And a dehydration step of dehydrating the selected fixed carbon powder, and a volatile matter removal step of removing volatile components fixed to the fixed carbon powder by mutual friction of the selected fixed carbon powder.

In addition, the low-grade coal reformer according to the present invention is a mill body having a receiving portion is formed to accommodate together with the low-grade coal and water containing fixed carbon powder, ash, volatile powder and water, and is accommodated in the receiving portion of the grinder body A plurality of friction balls for crushing the low-grade coal through collision and friction with the low-grade coal, and agitator and the accommodating part rotatably installed in the grinder body to stir the coal and friction ball mutually rubbing and friction It is provided with an abrasion crusher having a screen which is installed on the upper side and is formed with a plurality of penetration holes that can pass only particles of a predetermined size or less. In addition, the low-grade coal reforming apparatus according to the present invention for removing the volatile matter stuck to the fixed carbon powder by micronizing the fixed carbon powder discharged from the wear crusher through friction with steel balls or steel bars. A mill is provided.

According to the present invention, it is possible to extract fixed carbon powder from low grade coal very simply and economically, and there is an advantage that high quality coal can be produced using the extracted fixed carbon powder.

In addition, according to an embodiment of the present invention, the fixed carbon powder separated from the low grade coal is coated with heavy oil to prevent contact with oxygen, thereby preventing safety from being transported and storing, as the spontaneous ignition is suppressed.

In addition, according to the present invention, by separating the fixed carbon powder from low-grade coal, the volume and weight are reduced, which has the advantage of being economical in logistics and transportation.

1 is a schematic flowchart of a low grade coal reforming method according to a preferred embodiment of the present invention.

2 is a schematic configuration diagram of a wear crusher employed in a low grade coal reformer according to a preferred embodiment of the present invention, which is used in the crushing selection step.

FIG. 3 is a plan view of the screen of the wear crushing apparatus shown in FIG. 2 as viewed from above, and illustrates a screen transmission hole specification. FIG.

4 is a schematic configuration diagram of the planetary mill used in the volatile removal step.

Figure 5 is a chart showing the change in fixed carbon powder in the volatile removal step.

6 is a schematic configuration diagram of a mixer and a pressure evaporator used in the coating step and the evaporation removing step, which is employed in the low grade coal reformer according to a preferred embodiment of the present invention.

In one embodiment of the present invention, in order to suppress spontaneous ignition of the fixed carbon powder after the volatile component removal step, further comprising a coating step of coating the fixed carbon powder with heavy oil by mixing the fixed carbon powder and heavy oil, mixed with the heavy oil Continuously applying a shock while heating the fixed carbon powder further includes an evaporation removing step of removing volatile matter and water remaining in the fixed carbon powder.

In the pulverizing selection step, a catcher for making the fixed carbon powder hydrophobic is added to the water in order to float and sort the fixed carbon powder crushed in water upwards, and the catcher is food oil. It is formed by mixing 42 to 69% by weight and 31 to 58% by weight of petroleum.

In addition, in the pulverization screening step, it is preferable to supply a bubble to assist the rising of the fixed carbon powder in water upwards, and to supply a foaming agent to maintain the supplied bubble for a predetermined time.

Further, in the volatile matter removal step, the fixed carbon powder and the friction ball are accommodated together in a cylindrical planetary mill, and the volatile powder is fixed to the fixed carbon powder through friction between the friction ball and the fixed carbon powder by rotating the planetary mill. The vaporized and removed, in this process, the fixed carbon powder is micronized through friction, the volatile matter that has been fixed to the fixed carbon powder is exposed to the outside and vaporized, and the finely divided fixed carbon powder is agglomerated again (agglomeration).

Meanwhile, in one embodiment of the low grade coal reformer according to the present invention, the fixed carbon powder is rotatably installed in the mixer body and the mixer body in which an accommodating portion is formed to accommodate the fixed carbon powder and heavy oil discharged from the mill. Pressurization including a mixer having a blade for mixing oil and heavy oil, a pressurized evaporator body for accommodating the fixed carbon powder mixed with the heavy oil, and a press body rotatably coupled to the pressurized evaporator body and pressurizing the low grade coal. A first flow path surrounding and arranged with the pressure evaporator so as to heat the inside of the pressure evaporator through heat exchange with a heating fluid provided by heating from an evaporator and an external source, the mixer being connected to the first flow path A heating flow path portion disposed to surround and including a second flow path portion for heating the mixer; It is further provided.

Low grade coal to be treated in the present invention generally refers to coal having a quality of less than lignite coal, and high grade coal refers to anthracite coal, bituminous coal, etc., having a high fixed carbon content and a low ash content.

Coal is distinguished from high grade coal and low grade coal based on calorific value, but coal can be classified based on the contents of coal such as fixed carbon powder, ash, volatile powder and moisture. The lower the water content, the higher the class of coal. On the contrary, the fixed carbon content is about 50 to 60% by weight, and the ash, volatiles and a lot of water are classified as low grade coal.

Here, ash refers to a component that remains as ash after burning coal, and so-called silica minerals such as clay and silicon dioxide occupy most of the ash, and volatile matter refers to components such as tar.

The main purpose of the low grade coal reforming method according to the present invention is to remove ash and volatiles from the low grade coal to extract only fixed carbon powder and to refine the coal, and to delay spontaneous combustion of the low grade coal. In addition, the present invention provides a low grade coal reformer for use in a low grade coal reforming method.

Hereinafter, with reference to the accompanying drawings, a low grade coal reforming method and a low grade coal reforming apparatus according to a preferred embodiment of the present invention will be described in more detail. The low grade coal reformer consists of abrasion grinder, mill, mixer, pressurized evaporator, and heating flow path, each of which is used individually at each stage of the low grade coal reforming method. Each step of the reforming method will be described together.

Referring to Figure 1, the low grade coal reforming method (S100) according to a preferred embodiment of the present invention, the pulverization screening step (S10), dehydration step (S20), volatile matter removal step (S30), coating step (S40), evaporation And removing step S50 and forming step S60.

Grinding selection step (S10) is a step of grinding the low grade coal (c) small. That is, the low grade coal (c) contains the fixed carbon powder, ash and water, and is intended to separate the fixed carbon powder from the ash and moisture by grinding the low grade coal (c). In the crushing selection step S10, in order to crush the low grade coal c, a wear crusher 100 as shown in FIG. 2 is used.

The wear mill 100 is a component of the low grade coal reformer according to the present invention, which includes a mill body 10, an agitator 20, a plurality of friction balls 30, and a screen 50.

The pulverizer main body 10 is a container of a constant capacity, and a receiving portion 11 for accommodating low grade coal c and water is formed therein. The low grade coal (c) is mined in the coal mine and transported is received in the receiving portion 11 of the crusher body 10 in a state of being crushed to a size of approximately 50mm or less in diameter.

In addition, a plurality of friction balls 30 are accommodated together with the low grade coal c in the accommodating part of the grinder body 10. The friction ball 30 has a higher hardness than coal, and a steel material is used in this embodiment. The friction balls 30 collide with and rub against the low grade coal (c) during the stirring action of the stirrer 20 to be described later, thereby acting to crush the low grade coal (c) into particles of very fine size.

Water (w) is filled in the receiving portion 11 to a height higher than the loading height of the low grade coal (c) and the friction ball 30, the area is filled with only water without coal and friction ball in the receiving portion.

The stirrer 20 has a shaft 21 and a stirring portion 22. The shaft 21 is vertically arranged and connected to a driving means (not shown) such as a motor to receive a driving force. The lower part of the shaft 21 is disposed in the receiving portion 11 of the grinder body 10, and the stirring portion 22 is formed in this portion. The plurality of stirring portions 22 are formed along the horizontal direction, so that the low grade coal c and the friction ball 30 may rub against each other when the shaft 21 is rotated. In addition, the stirring unit 22 is a coal contained in the accommodating portion 11 so that the pulverized coal particles can be in sufficient contact with the catching agent and bubbles when the catching agent and the bubble to be described later is supplied to the receiving unit 11. Serves to stir.

When the low grade coal (c) having a diameter of about 50 mm or less is pulverized using the wear grinder 100 having the above-described configuration, the low grade coal (c) is pulverized very finely, and the low grade coal ( c) is separated into fixed carbon, ash and water. Ash and fixed carbon are almost completely separated so that the fixed carbon contains only about 2 to 5% of ash. The low grade coal (c) before the grinding is about 20% or more of the ash content, but after being crushed through the wear mill 100, the fixed carbon ash is contained in the ash content as small as 2 to 5%. In other words, fixed carbon and ash are effectively separated.

When ash is contained in an amount of 2 to 5%, it is suitable for use in thermal power generation, and is suitable for producing liquefied gas. In other words, in the process of crushing low grade coal, the ash is separated from the coal to a large extent, thereby enabling high quality.

On the other hand, when the fine coal particles (fixed carbon powder) is formed through the grinding process in the accommodating portion 11, the coal particles must be separated from the ash and extracted from the wear grinder 100. Here, the coal particles (r) is a low grade coal (c) is pulverized in the abrasion crusher 100, the fixed carbon powder comprises a small amount of 2 to 5% ash, the volatile powder attached to the fixed carbon powder, etc. Say the form.

In order to separate the pulverized coal particles from the ash, the present invention includes a screen 50, a buoyant reagent supply device 60, and a bubble supply device (not shown).

The screen 50 is installed in the accommodating part 11 of the grinder main body 10, and it is arrange | positioned in the position higher than the position where the low grade coal c and the friction ball 30 were loaded. That is, the low grade coal (c) and the friction ball 30 is installed in the area where only water (w) is accommodated above the portion. The screen 50 is formed in a lattice form, as shown in FIG. 3, to form a plurality of square through holes 51. The length of one side of the transmission hole 51 is approximately 50 µm to 200 µm, and is 150 µm in this embodiment. Accordingly, only coal particles r having a size smaller than 150 μm may pass through the screen 50.

In addition, a barge reagent supply device 60 for supplying a catcher and a foaming agent is provided above the crusher main body 10. The buoy reagent supply device 60 supplies a fixed amount of catcher and foaming agent at a predetermined interval.

The catcher is to make the finely divided coal particles r hydrophobic, so that the coal particles combined with the catcher are suspended above the water of the accommodating part 11. The catcher plays a role of increasing the hydrophobicity by selectively adhering to the surface of a specific solid particle, and is mainly a dipolar compound of a hydrocarbon chain, which can act on the mineral surface by ionizing a polar group. Have activity. Such catchers include oils, organic acids with hydrocarbon groups (mainly aliphatic) and their alkali salts, bases with carbon hydrogen groups (mainly aliphatic) and their salts. Oil types include animal oils, vegetable oils, mineral oils, and the like. Especially, the oil having a high degree of unsaturation has a hydroxyl group, a carboxyl group, a methoxy group, a sulfur group, and a nitrogen group.

In the present invention, a catcher is formed by mixing edible oil or human waste ingested oil with petroleum. The composition uses 42 to 69% by weight of food oil and 31 to 58% by weight of petroleum. In this embodiment, the catcher was formed with a composition of 60% by weight of food oil and 40% by weight of petroleum. The catcher is attached to the coal particles to hydrophobize the coal particles, thereby imparting the property of the coal particles to float above the water (w).

In addition, the foaming agent acts to allow the bubble supplied to the receiving portion 11 from the bubble supply device (not shown) installed at the lower end of the crusher body 10 to float while maintaining its shape to the upper side of the receiving portion 11 Do it.

That is, the foaming agent is a bipolar compound having a hydrophobic nonpolar group on one side and a hydrophilic polar group on the other side, and serves to maintain the safety of the bubbles so that the bubbles do not turn off for some time. A foaming agent has a hydroxyl group and a carboxyl group in hydrocarbon, and surfactant, such as higher alcohol and pine oil, is used.

As described above, when the catching agent and the foaming agent are administered while generating bubbles in the accommodating part 11, the finely divided coal particles are combined with the catching agent to form hydrophobicity, and are attached to the bubbles to accommodate the accommodating part 11. It floats to the upper side of). Coal particles (r) attached to the bubble is accumulated in the upper side of the screen 50 through the screen 50 while floating.

On the other hand, ash is a major component of the mineral, so the weight is high because it is not easy to float on its own, it is good to further improve the separation efficiency between coal particles and ash. That is, a known inhibitor for suppressing the floating of the silica minerals can be supplied together through the flotation reagent supply device 60 so that the ash in the accommodating portion 11 is suspended with the coal particles.

As described above, when the grinding selection step S10 is completed, the dehydration step S20 is performed. In the dehydration step (S20), the coal particles r are dehydrated by using a screen (not shown) having a smaller size of the perforation hole than the screen 50 of the wear crusher 100. That is, after placing the coal particles (r) on the screen (not shown), the screen is reciprocated straight to dry and dehydrate the water on the surface of the coal particles (r).

Since the water contained in the low grade coal (c) is almost separated in the process of crushing the low grade coal (c) in the previous crushing selection step (S10), the coal particles in the dehydration step (S20). The moisture on the surface of (r) is removed. When the dehydration step (S20) is completed, the water on the surface of the coal particles (r) is almost completely removed. However, some of the moisture remains in the coal particles (r), and approximately 5% by weight of moisture remains with respect to the entire coal particles (r). This level of water is equivalent to coal for thermal power generation and does not cause problems even for liquefied gas production.

As described above, when water and ash are removed from the low grade coal through the crushing selection step (S10) and the dehydration step (S20), the volume and weight of the low grade coal are nearly half as high as before the water removal. Falls. This can provide very advantageous conditions in logistics, such as shipping.

After the dehydration step (S20) is carried out a volatile removal step (S30). Volatilization has a great effect on spontaneous ignition of low grade coal. If low grade coal is loaded without removing volatile matter, spontaneous ignition occurs easily even at a slight temperature rise. Therefore, if the coal is shipped for a long time without removing the volatile matter for low-grade coal, there is a problem that it is not easy to manage such as continuously spraying the low-grade coal to remove the risk of spontaneous combustion.

In the low grade coal (c), the volatiles are completely fixed to the fixed carbon powder and thus remain separate from the fixed carbon powder even after the pulverization screening step (S10). Therefore, a separate process is required to remove the volatile powder. In this embodiment, to remove the volatiles, the volatiles removing step (S30) and the evaporation removing step (S50) is performed. First, the volatile matter removal step (S30) will be described, and the evaporation removal step (S50) will be described again after explaining the coating step (S40).

In the volatile removal step (S30), a mill is used to remove the volatile matter (volitile matter) stuck to the fixed carbon powder, and in this embodiment, a planetary mill is used. As shown in FIG. 4, the planetary mill 200 has a cylindrical shape, and although not shown, steel balls or steel bars are accommodated therein. In the present embodiment, four planetary mills are provided to rotate and revolve by driving means.

Steel balls and coal are accommodated inside the planetary mill 200, and the planetary mill 200 is rubbed with each other when the planetary mill 200 rotates and rotates. Coal particles are finely divided by continuous collision with steel balls, and in the process of micronization, volatiles attached to fixed carbon powder are exposed to the outside. When the coal particles and steel balls are rubbed, the temperature of the frictional part is raised very instantaneously. When the temperature is raised momentarily while the volatiles are exposed, the volatiles are vaporized and removed from the coal particles. This phenomenon may also be described as a mechanochemical effect in that chemical changes occur due to the removal of volatiles in the coal particles by repeated physical impacts.

On the other hand, the process of changing the shape of the coal particles in the volatile removal step (S30) is shown in FIG. Referring to FIG. 5, the coal particles r are pulverized inside the planetary mill 200 to be in the same state as (a). Since this process is a process of micronization of particles, the specific surface area of all coal particles increases and the particle size decreases. If this condition persists, as shown in FIG. 5 (b), the particle size of the coal particles gradually increases to cause the particles to aggregate together. However, even in this state, the specific surface area of the particles is continuously increasing, so that the particles do not aggregate together to form a new particle group, but are bound in a weak state.

However, if the particles continue to aggregate together, the particles become completely agglomerated. As the particle size of the particles increases, the specific surface area decreases, eventually forming a new particle group as shown in FIG. That is, when the volatile matter removal step (S30) is completed, the fixed carbon powder is agglomerated into secondary particles.

After the volatiles removal step (S30) is carried out the coating step (S40) and the evaporation removal step (S50). In the coating step (S20) by mixing the coal particles secondary aggregated in the volatile matter removal step (S30) and heavy oil such as tar (heavy oil) so that heavy oil is coated on the surface of the coal particles.

In the present embodiment, the mixer 300 is used in the coating step (S40). The mixer 300 constitutes a low grade coal reformer according to the present invention together with the above-described wear mill 100 and the planetary mill 200. The mixer 300 has a mixer body 310 and a blade 320.

Inside the mixer body 310, a receiving part is formed to accommodate coal particles, and heavy oil such as tar is introduced. Herein, coal particles refer to particles aggregated after the pulverization screening step and the volatilization step as described above, and most of them are fixed carbon powder but contain a small amount of ash, volatile matter and water.

The mixer body 310 is provided with a plurality of blades 320 which are disposed in a horizontal direction and rotated so that coal particles and heavy oil are evenly mixed. As the blade 320 rotates, coal particles and heavy oil are evenly mixed so that heavy oil is coated on the surface of the coal particles. Meanwhile, the ball media 330 having a higher hardness than the coal particles may be disposed in the mixer body 310 to further finely grind the coal particles c in the mixing process of the heavy oil and the coal particles c.

As described above, when the heavy oil is coated on the surface of the coal particles (c) using the blade 320, the coal particles (c) can reduce the amount of contact with oxygen even when exposed to the air, so that the natural The possibility of ignition can be significantly reduced.

When the coating step (S40) is completed, the coal particles coated with heavy oil is moved to the pressure evaporator 400 to perform the evaporation removal step (S50). In the evaporation removal step (S50) is a process for removing volatile matter and water that can still remain in the coal particles (r) even after the volatile matter removal step (S30).

In the evaporation removal step (S50) by using a pressure evaporator 400, which is one component of the low grade coal reformer according to the present invention, the volatiles and water are removed by continuously applying the impact while heating the coal particles.

The pressurized evaporator 400 includes a pressurized evaporator body 410, and the coal particles coated with heavy oil are accommodated in the pressurized evaporator body 410. On the side wall of the pressure evaporator body 410, a first heating passage 420, through which heated steam flows, is formed in a spiral shape. That is, the steam introduced into the lower sidewall of the pressurized evaporator body 410 passes through the first heating passage 420 formed in a spiral shape, and heats the coal particles c inside the pressurized evaporator, and then the sidewall of the pressurized evaporator body 410. It is discharged through the top.

In addition, the inside of the pressure evaporator body 410 is provided with a pressurizing body 430 to press the coal particles downward to impact. The pressurizing member 430 includes a rotation shaft 431 vertically disposed and connected to an external driving source such as a motor, and a support bar 432 extending horizontally from the rotation shaft 431. The support bar 432 has a very large weight and is coupled to the pressing member 433 formed in an annular shape. The annular pressing member 433 is rotated by the rotating shaft 431 to impact the coal particles (c) disposed in the lower portion of the pressing member 433 by its own weight.

The coal particles (c) are finely crushed while being continuously impacted by the pressure member 433, during which the water and volatiles are exposed to the surface of the coal particles. In the pressurized evaporator 400, not only high heat is generated during the pressurization and friction process of the pressurizing member 433, but also the steam inside the pressurized evaporator 400 is heated to about 100 to 140 ° C., so that the coal particles c Residual water and volatiles can be vaporized and removed. Evaporated water and volatile matter are discharged through a hood (not shown) formed on the upper part of the pressurized evaporator body 410 and collected in a waste trap 450 provided separately.

On the other hand, the above phenomenon is that the pressure member 433 continuously impacts the coal particles (c) by removing the volatile matter and water in the coal particles (c) side of the chemical properties of the coal particles (c) is changed In addition, it may be described as a mechano chemical effect, it can be seen that performs the same action as the above volatile matter removal step (S30).

However, in the volatile removal step (S30), if the impact by friction between the coal particles and coal particles in the planetary mill 200 is applied, in the present evaporation removal step (S50) using the pressurizer 430, the impact amount and the pressurized amount By increasing the volatilization and water removal can be ensured at a high level.

On the other hand, the steam discharged from the pressurized evaporator 400 is introduced into the second heating flow path 350 formed on the side wall of the mixer 300 to heat the mixer 300, thereby removing some moisture and volatile matter from the mixer 300. Vaporize. In the mixer 300, a very small amount of water and volatile matter are vaporized compared to the pressurized evaporator 400, which are collected into the waste trap 440 through a hood (not shown).

The steam discharged from the second heating channel 350 is purified again by flowing into the first heating channel 420 of the pressurized evaporator 400, before being introduced into the first heating channel 420. Can be heated again to maintain a constant temperature.

The low grade coal reformer according to the present invention has a heating flow path portion including a first heating flow path 420 and a second heating flow path 350, and as described above, the wear grinder 100, the planetary mill 200, and the mixer. 300 and the evaporator 400 is provided so that the low grade coal reforming method according to the present invention can be efficiently carried out.

After the evaporation removal step (S50), the low-grade coal reforming method according to the present embodiment is completed by performing a molding step (S60) of collecting coal particles and molding the coal particles into a predetermined shape.

By the above-described method, by selecting the fixed carbon powder from the low grade coal containing a large amount of ash, water and volatile matter, high-quality coal with high fixed carbon content and volatile matters can be produced.

In addition, by removing moisture and the like, the weight and volume are also reduced, so that favorable conditions are formed even in shipping and logistics, and volatiles are removed, thereby lowering the possibility of spontaneous combustion, thereby ensuring stability.

In the above, the present invention has been described in detail with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various modifications are possible by those skilled in the art within the technical idea of the present invention. Is obvious. Embodiments of the invention have been considered in all respects as illustrative and not restrictive, which include the scope of the invention as indicated by the appended claims rather than the detailed description therein, the equivalents of the claims and all modifications within the means. I want to.

Claims

For the high quality of low grade coal containing fixed carbon ash, ash, volatile matter and moisture,

A pulverization screening step of selecting the fixed carbon powder by pulverizing the low grade coal by friction in water;

A dehydration step of dehydrating the selected fixed carbon component; And

And a volatile component removing step of removing the volatile components fixed to the fixed carbon powder by mutually rubbing the selected fixed carbon powder.
The method of claim 1,

In the pulverization screening step, a catcher for making the fixed carbon powder hydrophobic is added to the water in order to float and sort the fixed carbon powder crushed in water upwards,

The catcher is a low grade coal reforming method, characterized in that formed by mixing 42 ~ 69% by weight of food oil, 31 ~ 58% by weight of petroleum.
The method of claim 2,

In the crushing selection step,

Supplying bubbles to assist the fixed carbon powder to rise upward in the water,

Low grade coal reforming method characterized in that for supplying a foaming agent so that the supplied bubbles can be maintained for a certain time.
The method of claim 1,

In the volatile removal step,

The fixed carbon powder and the friction ball are accommodated together in a cylindrical planetary mill, and by rotating the planetary mill, the volatile powder fixed to the fixed carbon powder is vaporized and removed through friction between the friction ball and the fixed carbon powder. Low grade coal reforming method.
The method of claim 4, wherein

In the volatile matter removal step, the fixed carbon powder is micronized through friction, so that the volatile powder fixed on the fixed carbon powder is exposed to the outside and vaporized, and the finely divided fixed carbon powder is agglomerated again. Way.
The method of claim 1,

In order to suppress spontaneous ignition of the fixed carbon powder after the volatile component removal step, the low-grade coal reforming method further comprising a coating step of coating the fixed carbon powder with heavy oil by mixing the fixed carbon powder and heavy oil.
The method of claim 6,

And continuously evaporating the fixed carbon powder mixed with the heavy oil while removing the volatile matter and water remaining in the fixed carbon powder.
The method of claim 7, wherein

In the coating step and the evaporation removal step low-grade coal reforming method characterized in that for heating the fixed carbon powder with steam.
A crusher main body having an accommodating portion formed therein for accommodating low-grade coal and water containing fixed carbon ash, ash, volatile matter, and water, and the collapsing and friction with the low grade coal contained in the accommodating portion of the A plurality of friction balls for crushing low grade coal, an agitator rotatably installed in the crusher main body and agitating the coal and friction balls to collide with each other and friction, and are installed on the upper side of the receiving part and pass only particles having a predetermined size or less. Abrasion crusher having a screen having a plurality of permeable holes formed therein; And

A mill for removing volatile matter adhered to the fixed carbon powder by micronizing the fixed carbon powder discharged from the wear mill through friction with a steel ball or steel rod; and Low grade coal reformer characterized in that.
The method of claim 9,

A mixer having a mixer body having an accommodating portion formed therein to accommodate the fixed carbon powder and heavy oil discharged from the mill, and a blade rotatably installed in the mixer body to mix the fixed carbon powder and heavy oil;

A pressurized evaporator having a pressurized evaporator body accommodating the fixed carbon powder mixed with the heavy oil, and a press body rotatably coupled to the pressurized evaporator body and pressurizing the low grade coal; And

A first flow passage part surrounding and arranged with the pressurized evaporator so as to heat the inside of the pressurization evaporator through heat exchange with a heating fluid provided heated from an external source, and connected to the first flow passage part to surround the mixer And a heating flow path portion disposed and including a second flow path portion for heating the mixer.
The method of claim 9,

The through hole of the screen is a low grade coal reformer, characterized in that the length of one side is formed 50 ~ 200 microns.