KR101392468B1 - Generating system of coal gas from low-rank coal and generating method thereof - Google Patents

Abstract

The present invention relates to a coal gas generation system using low grade coal and a generation method thereof. The coal gas generation system using low grade coal includes a rotary kiln unit, a transfer unit, and an after combustion unit. The rotary kiln unit includes: a first opening part and a second opening part which are formed to be connected and face each other; a rotary kiln furnace which pyrolizes low grade coal and discharges the low grade coal in the form of char and coal gas; a heat storage through an initial warm-up for the rotary kiln furnace which is formed with a fireproof material and an insulating material; at least one first burner which provides heat which is necessary for maintaining a flame of the volatile matter of the pyrolized low grade coal and maintaining the internal temperature of the rotary kiln; and a discharge unit which discharges char which is generated in the rotary kiln by being connected to the second opening part. The transfer unit transfers low grade coal to the rotary kiln furnace by being connected to the first opening part. The after combustion unit: is connected to the first opening part; includes at least one second burner which provides heat which is necessary for the second combustion of coal gas which is discharged from the rotary kiln furnace and the proper temperature maintenance of exhaust gas which is discharge in the after combustion unit; and discharges coal gas in an exhaust gas form in which combustible and explosive materials are removed by burning the coal gas. Like the forementioned, the coal gas generation system using low grade coal of the present invention is able to generate char which can be used as smokeless fuel by pyrolizing the low grade coal and is also able to generate exhaust gas which can be used in a thermal energy generation. The present invention is also able to not only protect an air environment but also save energy by using coal gas which may cause environmental pollution in a thermal energy generation without discharging the coal gas to the outside.

Description

TECHNICAL FIELD [0001] The present invention relates to a coal gas generating system and a coal gas generating method using low-

The present invention relates to a coal gas generating system, and more particularly, to a coal gas generating system for producing coal gas and char by pyrolyzing low-grade coal, A gas generating system and a power generating method.

Coal is difficult to control combustion, and many pollutants such as NOx and SOx are generated at the time of combustion, so there are various difficulties to use directly as fuel. In addition, when storing or transporting coal as a solid fuel, not only a large amount of equipment is required but also there is a risk of spontaneous combustion in storage, so special care is required. As a result, coal is used as a fuel for power generation around the world, and is used in a smaller amount than petroleum or natural gas.

However, oil and natural gas are limited in their distribution area and reserves. However, since coal has a long shelf life and is distributed all over the world and is inexpensive, it can be expected to stabilize energy supply in the future. Coal The use of clean coal has been on the rise.

About 50% of the buried coal in the world is made up of low grade coal containing ash and water, and about 50% is composed of fine coal containing no moisture and high carbon content. Most of the coal used in the coal-fired power plant uses high-quality coal, which contains a lot of carbon, but as the depletion of high-grade coal resources and the industrialization of the developing countries are progressing,

Therefore, it is necessary to develop clean coal technology that can not only lower the price but also utilize low-grade coal which is buried in many places in the world efficiently, and reduce air pollution caused by coal gas that can be generated by using low- to be.

Korean Registered Patent No. 10-1194033, October 24, 2012 (Name: Coal drying device for coke and drying method)

Accordingly, an object of the present invention is to provide a coal gas generation system and a power generation method using low-grade coal having a power generation system using pyrolysis of low-grade coal to produce coal and coal gas and using combustion heat of the generated coal gas.

In order to accomplish the above object, the present invention provides a rotary kiln furnace comprising a first opening portion and a second opening portion formed to communicate and facing each other, and which pyrolyzes the low grade coal and discharges the char in the form of char and coal gas, And at least one first burner for providing flame formation and heat necessary for the pyrolysis of the lower carbon to the kiln furnace, and a discharge portion connected to the second open portion for discharging the furnace produced in the rotary kiln furnace A transfer unit connected to the first opening unit to transfer the low grade coal to the rotary kiln; a heat transfer unit connected to the first opening unit, for heating the coal gas discharged from the rotary kiln furnace; And a second burner for burning the coal gas and discharging the combustible material in the form of an exhaust gas from which the combustible material has been removed, The present invention also provides a coal gasification system using low carbon.

In the coal gas power generation system using the low grade coal according to the present invention, the coal gas generating system includes a coal cooling unit for receiving and cooling the coal discharged from the discharge unit, and a coal storage unit for storing the coal cooled by the coal cooling unit And further comprising a yarn processing unit.

The coal gas power generation system using low carbon according to the present invention may further include a heat energy utilization unit for receiving the exhaust gas discharged from the downstream burner unit and generating energy using heat of the exhaust gas .

In the coal gas power generation system using low carbon according to the present invention, the rotary kiln is installed downward in the direction from the first opening to the second opening, and is installed in the first opening by rotation. The low grade coal is conveyed in the direction of the second opening and the coal gas discharged from the low grade coal is conveyed in the direction of the first opening from the second opening to be discharged to the afterburning section.

In the coal gasification system using low carbon according to the present invention, the rotary kiln may pyrolyze the low carbon to volatilize 50 to 95% of the volatile matter of the low carbon to produce the crude oil containing 5 to 50% .

In the coal gasification system using low-grade coal according to the present invention, the rotary kiln has the low-level coal retention time of 30 minutes to 90 minutes to produce the coal containing 5 to 50% volatile matter .

In the coal gas power generation system using low carbon according to the present invention, the transfer unit may include a crushing module for crushing the particle size of the low grade coal introduced into the hopper to 30 mm or less, The process comprising the steps of:

In the coal gasification system using low carbon according to the present invention, the exhaust gas discharged from the burner is 800 to 900 ° C.

In the coal gas power generation system using low carbon according to the present invention, the coal gas generated in the coal discharged from the coal cooling unit is centrifuged to separate the coal gas from the coal, And a cyclone for discharging the coal gas from which the fine powder is separated to the discharge unit.

In the coal gas power generation system using low carbon according to the present invention, the heat energy utilization unit is a waste heat boiler or a thermoelectric generator.

The present invention relates to a method for manufacturing a coal burning furnace, which comprises a transfer step of crushing or drying a low grade coal charged through a hopper and transferring the low grade coal fed to the rotary kiln furnace to a rotary kiln furnace through a flame and heat provided by at least one first burner, , A coal gas discharge step of discharging the coal gas to the combustion unit after being connected to the rotary kiln, a step of burning the coal gas discharged from the post-combustion unit through the heat provided by the at least one second burner Wherein the burned coal gas is discharged in the form of an exhaust gas having a temperature of 800 to 900 DEG C, and the combustible material is removed from the burner.

The method for producing coal gas using low carbon according to the present invention may further comprise an energy production step of producing energy by using the heat of the exhaust gas accommodated in the heat energy utilization part of the exhaust gas discharged from the downstream combustion part .

In the method for producing coal gas using low carbon according to the present invention, the pyrolysis step pyrolyzes the low carbon to volatilize 50 to 95% of the volatile matter of the low carbon to produce the petroleum containing 5 to 50% volatile matter .

In the method for generating coal gas using low carbon according to the present invention, the coal is discharged through a discharge unit connected to the rotary kiln, and the coal discharged from the discharge unit is received and cooled in a coal cooling unit And a till storage step of storing the till cooled in the till cooling unit in a till storage unit.

According to the coal gas generation system and the power generation method using the low carbon of the present invention, it is possible to produce exhaust gas which can be used as a lead-free fuel and thermal exhaust gas that can be used for thermal energy generation by pyrolyzing low carbon.

In addition, by using coal gas, which can cause environmental pollution, to generate heat energy without discharging it to the outside, it is possible not only to protect the atmospheric environment, but also to save energy.

1 is a view showing a coal gas generating system using low carbon according to an embodiment of the present invention.
2 is a flowchart illustrating a method for generating coal gas using low carbon according to an embodiment of the present invention.

In the following description, only parts necessary for understanding the embodiments of the present invention will be described, and the description of other parts will be omitted so as not to obscure the gist of the present invention.

The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings and the inventor is not limited to the meaning of the terms in order to describe his invention in the best way. It should be interpreted as meaning and concept consistent with the technical idea of the present invention. Therefore, the embodiments described in the present specification and the configurations shown in the drawings are merely preferred embodiments of the present invention, and are not intended to represent all of the technical ideas of the present invention, so that various equivalents And variations are possible.

Hereinafter, a coal gasification system using low carbon according to the present invention will be described in detail with reference to the drawings.

The quality of coal is classified by the degree of carbonization and is divided into peat with the lowest degree of carbonization, brown coal, sub-bituminous coal, bituminous coal, anthracite grade. do. Here, bituminous coal or anthracite is classified as high-grade coal, and lignite or sub-bituminous coal is classified as low-grade coal.

The low-grade coal used in the present invention is low-grade coal having a moisture content of 5 to 40% by weight and a volatile content of 20 to 40% by weight, which is coal or bituminous coal.

1 is a view showing a coal gas generating system using low carbon according to an embodiment of the present invention.

Referring to FIG. 1, a coal gas generating system 100 using low carbon according to an embodiment of the present invention includes a conveying unit 40, a rotary kiln unit 10, a burner unit 50, a turbocharger unit 60, And a thermal energy generating section.

The transfer unit 40 serves to transfer low-grade coal to the rotary kiln 20. In other words, the conveying unit 40 conveys the low-grade shot put through the hopper 42 to the rotary kiln 20 through a conveying means in the form of a screw or a conveying means in the form of a conveyor. The feed unit 40 may be provided with a screw feeder which can supply a low-grade carbon in a fixed amount to the rotary kiln 20 at a portion of the rotary kiln furnace 20 connected to the first opening 22.

The transfer unit 40 may include a crushing module 44 and a drying module 46.

The crushing module 44 can crush the particle size of the low carbon into the hopper 42 to 30 mm or less. The low-grade coal charged into the hopper 42 is crushed through a jaw crusher, and the low-grade coal not crushed to a particle size of 30 mm or less through the crusher can be crushed through an impact crusher.

The reason for crushing the particle size of the lower carbon to 30 mm or less is that the lower surface of the lower carbon is widened and the pyrolysis of the lower carbon is performed well in the rotary kiln (20) to be described later.

The low carbon discharged from the crushing module 44 is introduced into the drying module 46. The drying module 46 is a process of drying the pulverized low-grade coal in the pulverization module 44, thereby removing the moisture of the low-grade coal to improve the quality of the low-grade coal.

A fluidized bed dryer may be used as a dryer capable of removing moisture from the low carbon in the drying module 46. In a fluidized bed dryer, fluidized bed drying occurs in which a drying material is placed on a dispersion plate and the powdered material is suspended by convection heat of air and mixed with hot air. In other words, in a fluidized bed dryer, low-grade coal is placed on a perforated plate, and hot air is blown from the lower side of the low-grade coal, so that the low-grade coal can be dried while moving like a fluid. In the drying module 46 using the fluidized bed dryer, since the low carbon is fluidized and dried by the hot air in the fluidized bed dryer, the drying efficiency is excellent.

Further, a rotary kiln type dryer may be used as a dryer capable of removing moisture of low grade coal from the drying module 46. The rotary kiln type dryer includes a rotating rotary kiln and a hot air furnace mounted on one side of the rotary kiln to provide hot air to the inside of the rotary kiln. The low carbon discharged from the crushing module 44 is introduced into the rotary kiln, and the low carbon can be dried by the hot air provided inside the rotary kiln. The drying module 46 using the rotary kiln type dryer is capable of mixing hot air and low carbon by the rotation of the rotary kiln, so that the drying effect is increased, and the facility is cheap.

However, the technical idea of the present invention is not limited to the dryer used in the drying module 46 as a fluidized bed dryer or a rotary kiln type dryer, and various dryers capable of removing moisture from low grade coal may be used.

The rotary kiln portion 10 includes a rotary kiln furnace 20 and a discharge portion 30 and pyrolyzes the low carbon burnt into the rotary kiln furnace 20 through heat and flame provided by the first burner 32 .

The rotary kiln furnace 20 includes a first opening 22 and a second opening 24 which are communicated and opposed to each other and pyrolyze the lower carbon to discharge it in the form of char and coal gas do. The rotary kiln furnace 20 is installed so as to be inclined downward in the direction of the second opening 24 from the first opening 22 and the low carbon buried in the first opening 22 by rotation, 24). ≪ / RTI > Since the rotary kiln furnace 20 is installed to be inclined downward in the direction of the second opening portion 24 from the first opening portion 22, the coal gas discharged from the low carbon is discharged from the second opening portion 24 to the first opening portion 22 and may be discharged to the downstream burner 50. The second opening 24 is connected to a discharge portion 30 which includes at least one first burner 32 for providing the heat and flame necessary for thermal decomposition of the low carbon shot put into the rotary kiln furnace 20.

The process of generating coal and coal gas by pyrolyzing low-grade coal introduced from the rotary kiln furnace 20 through the transfer unit 40 is as follows.

First, the rotary kiln furnace 20 is provided with a refractory material and a heat insulating material to accumulate heat through preheating using the first burner 32. The internal temperature of the rotary kiln furnace 20 is maintained at 400 to 600 ° C through the heat provided by the first burner 32. The reason for keeping the internal temperature of the rotary kiln furnace 20 at 400 to 600 ° C is to control the concentration of volatile matter remaining in the furnace through pyrolysis, which will be described later.

The transfer part 40 is connected to the first opening part 22 so that the low grade carbon is injected into the rotary kiln furnace 20 through the first opening part 22. In other words, the low-grade coal is introduced into the rotary kiln furnace 20, which maintains the internal temperature of 400 to 600 ° C. through the transfer unit 40.

Since the rotary kiln furnace 20 is inclined downwardly in the direction of the second opening 24 from the first opening 22 and the rotation of the rotary kiln furnace 20 rotates, (24). The low-grade coal conveyed in the direction of the second opening portion (24) starts pyrolysis by the internal temperature of the rotary kiln furnace (20). In other words, devolatilization occurs due to reaction with volatile matter generated in the low carbon by heat accumulated in the rotary kiln furnace 20.

The low-grade carbon in which the pyrolysis has started is formed by the first burner 32, and the flame is formed by combustion of a part of the volatile matter which is initially ignited. The formed initial flame is introduced into the first opening 22, ) Direction of the low-grade carbon, which is required for the combustion of volatile matter generated through the thermal decomposition of the low-grade carbon. That is, the initial burning of the low-carbon volatiles in the rotary kiln furnace 20 is performed by the first burner 32, so that the flame of volatile matter generated by the low-grade coal continuously injected into the rotary kiln furnace 20 can be maintained . This eliminates the need for continuous operation of the first burner 32 for flame formation in the rotary kiln furnace 20. [ Therefore, the first burner 32 can store the rotary kiln furnace 20, stop the operation after providing only the heat for the initial ignition of the low grade coal, thereby reducing the cost required to operate the rotary kiln furnace 20 Can be saved.

However, when the internal temperature of the rotary kiln furnace 20 is lowered, the first burner 32 again provides heat to the rotary kiln furnace 20 so that the rotary kiln furnace 20 has an internal temperature of 400 to 600 ° C And can provide the flame necessary for pyrolysis of the lower carbons.

As mentioned above, the rotary kiln (20) pyrolyzes the low grade coal to produce coal and coal gas. The retention time of the low-grade carbon in the rotary kiln furnace 20 is set in the range of 30 minutes to 90 minutes, and the internal temperature of the rotary kiln furnace 20 can be maintained at 400 to 600 ° C. The reason for maintaining the residence time of the low grade coal and the internal temperature of the rotary kiln furnace 20 is to control the concentration of volatile matter remaining in the furnace through thermal decomposition. In other words, it is a by-product produced in the pyrolysis process of low-grade coal. It is composed of mixed carbon components of ash and can be directly used as smoke-free fuel. For this purpose, . In other words, the low-grade carbon is pyrolyzed in the rotary kiln 20 to volatilize 50 to 95% volatile matter of the lower carbon to produce volatile matter containing 5 to 50% volatile matter.

When the volatile content contained in the tulle is less than 5%, when the tulle is used as the lead-free fuel, the volatilization is small and the combustion becomes difficult. In addition, when the volatile content contained in the vat exceeds 50%, there is a risk of spontaneous ignition due to volatilization.

The oil produced in the rotary kiln furnace (20) is discharged to the turbocharger (60) through the discharge portion (30).

The turbulator 60 includes a turbo cooling unit 62 for receiving and cooling the exhaust discharged from the discharge unit 30 and a turbo storage unit 64 for storing the turbocharged by the turbo cooling unit 62 do.

The cooling chamber 62 is cooled by cooling air blown into the cooling chamber 62. At this time, the turbulent cooling section 62 can rotate. The rotation of the turbulent cooling section 62 also rotates as a tumbler included in the turbulent cooling section 62, and the surface area So that it is efficiently cooled. The reason for cooling the barrel is to prevent it from burning by contact with external oxygen.

And is received and stored in the cooled roll storage 64 discharged from the roll cooling unit 62.

The coal gas power generation system 100 using low carbon according to the embodiment of the present invention may further include a cyclone 66. [ The cyclone 66 is a device capable of separating solid particles or liquid droplets suspended in a gas, or separating solid particles suspended in a gas by a particle size or a specific gravity difference, The particles can be separated from the fluid by centrifugal force.

The cyclone 66 receives the coal gas generated while the coal is cooled in the coal cooling section 62. The cyclone 66 is a separation device using a centrifugal force generated by the swirling flow of the fluid. The coal gas contained in the cyclone 66 is centrifuged, and the fraction separated from the coal gas is discharged to the hopper storage part 64.

The coal gas from which the fine powder is separated is discharged to the discharge portion 30 for use as a heat source in a heat energy utilization portion to be described later and discharged to the burner 50 as coal gas generated in the rotary kiln furnace 20 .

As mentioned above, the rotary kiln (20) pyrolyzes the low grade coal to produce coal and coal gas.

The lower carbon is a material composed of elements of carbon (C), hydrogen (H), nitrogen (N), oxygen (O) and sulfur (S), and the lower kiln is pyrolyzed in the rotary kiln The generated coal gas consists of carbon dioxide (CO ₂ ), nitrogen (N ₂ ), coal tar, carbon monoxide (C 0), hydrogen (H ₂ ), methane (CH ₄ ) ) And other combustible materials. The coal gas produced by pyrolysis in the rotary kiln furnace 20 has a temperature of 400 to 700 ° C. Thus, the coal gas produced by pyrolysis in the rotary kiln furnace 20 is discharged to the post-combustion section 50.

The post-combustion section (50) is connected to the first opening (22) and receives the coal gas discharged from the rotary kiln furnace (20). The post-combustion section (50) includes at least one second burner (52) that provides the heat necessary to burn the coal gas leaving the rotary kiln (20).

Since the post-combustion section 50 is connected to the rotary kiln furnace 20 in a connected state, the process of discharging the coal gas generated in the rotary kiln furnace 20 to the post-combustion section 50 can be performed quickly, The temperature of the coal gas can be prevented from being lowered. In addition, since the post-combustion section 50 is connected to the rotary kiln furnace 20 and connected thereto, the coal gas generated in the rotary kiln furnace 20 is discharged to the post-combustion section 50, May not occur.

The post-combustion section 50 uses the second burner 52 to secondarily burn the coal gas discharged from the rotary kiln furnace 20 and maintain the temperature of the discharged gas through the additional heat source at 800 to 900 ° C. Whereby the coal tar or combustible material contained in the coal gas discharged from the rotary kiln 20 can be removed. That is, the post-combustion section 50 receives the coal gas discharged from the rotary kiln furnace 20, burns it, and discharges the combustible material in the form of exhaust gas from which the combustible material has been removed. In other words, when the coal gas having a temperature of 400 to 700 ° C is burned in the burner 50 and the exhaust gas having the combustible material is removed at a temperature of 800 to 900 ° C through the additional heat source supply, The coal tar produced by the incomplete combustion in the thermal cracking process in the rotary kiln furnace 20 is completely burned and removed by the secondary combustion and the combustible material can be burned and removed . Therefore, the exhaust gas discharged from the post-combustion section 50 can be discharged from the exhaust gas having a temperature of 800 to 900 DEG C, and the coal tar or combustible material is removed.

As described above, the exhaust gas used in the heat energy utilization portion, which will be described later, is able to use the exhaust gas from which the coal tar has been removed and the flammable material which is dangerous for the explosion has been removed through the post-combustion section 50.

The exhaust gas having the temperature of 800 to 900 DEG C generated in the post-combustion section (50) and having the combustible material removed is discharged to the heat energy utilization section.

The heat energy utilization section accommodates the exhaust gas discharged from the post-combustion section (50), and generates energy using heat of the exhaust gas. That is, the heat energy utilization part is a part that produces energy such as electricity necessary for living by using exhaust gas having a temperature of 800 to 900 ° C.

In the embodiment of the present invention, the waste heat boiler 70 for generating steam by using the exhaust gas discharged from the burner 50 as a heat source is used as the heat energy utilization unit. However, the technical idea of the present invention is not limited to this, A thermoelectric generator capable of generating electricity using a gas as a heat source may be used and various energy production systems capable of producing energy necessary for living using heat may be used.

The waste heat boiler 70 refers to a boiler that generates steam by using waste heat as a heat source. In other words, in the embodiment of the present invention, the waste heat boiler 70 generates steam using the exhaust gas having a temperature of 800 to 900 ° C., and uses the generated steam to preheat the combustion air, And the like.

The waste gas used in the conventional waste heat boiler contains a large amount of ash, which contains corrosive, toxic and explosive components, which causes the heat transfer surface of the waste heat boiler to be contaminated and damaged, and there is a risk of explosion. However, since the coal gas generating system 100 using low carbon according to the embodiment of the present invention uses a coal tar and a waste heat boiler using exhaust gas from which flammable substances are removed as a heat source, the heat transfer surface is not soiled, There is no advantage.

A thermoelectric generator is a device that can convert thermal energy directly into electric energy. That is, the heat generated by the temperature difference between the high temperature portion and the low temperature portion is an apparatus for converting energy to be transferred into electric energy. Because electricity is generated only by the temperature difference of heat, electricity can be produced in an environmentally harmless manner. When a thermoelectric generator is used as a heat energy utilization unit, the thermoelectric generator can generate electricity at a temperature of 800 to 900 DEG C because it has a temperature of 800 to 900 DEG C and uses exhaust gas from which coal tar and combustible materials are removed , There is no risk of explosion, and there is an advantage that a long life can be obtained.

As described above, the coal gas power generation system 100 using the low carbon according to the embodiment of the present invention does not discharge the coal gas generated by pyrolyzing the low grade coal in the rotary kiln furnace 20 to the outside, It is possible to produce energy required for living by using heat energy, and thus it is possible not only to protect the air environment but also to produce energy such as electricity necessary for living.

2 is a flowchart illustrating a method for generating coal gas using low carbon according to an embodiment of the present invention.

Referring to FIG. 2, a method for generating coal gas using low carbon according to an embodiment of the present invention includes a transfer step S10, a pyrolysis step S20, a coal gas discharge step S30, a post-combustion step S32, A production stage S34, a stage cooling stage S40, and a stage stage S42.

In the transfer step S10, the low-grade coal charged into the transfer section is transferred to the rotary kiln via the first opening connected to the transfer section. That is, the low-grade coal charged into the conveyance unit is crushed or dried through the hopper and transferred to the rotary kiln.

In the transferring step (S10), the particle size of the low-grade coal is reduced to 30 mm or less through the jaw crusher or the impact crusher. As a result, the surface area of the low-grade coal is widened so that the pyrolysis of the low- Further, in the transfer step S10, in order to increase the quality of the low carbon, moisture of the low carbon can be removed. As a drier capable of removing water from the low carbon, a fluidized bed dryer or a rotary kiln type dryer can be used.

The pyrolysis step (S20) pyrolyzes the low carbon transferred to the rotary kiln furnace in the form of coal and coal gas through the flame and heat provided by at least one first burner. As described above, when the low-grade coal is introduced into the rotary kiln furnace preheated to 400 to 600 ° C through the first opening, the rotary kiln is installed and rotated downwardly in the direction from the first opening to the second opening, 1 low-grade coal introduced through the opening is pyrolyzed in the form of coal and coal gas by the internal temperature of the rotary kiln while being transported toward the second opening.

The coal gas generated from the rotary kiln furnace contains combustible materials such as coal tar and volatile matter. In the coal gas discharge step (S30), coal gas containing coal tar and combustible materials such as volatile matter is connected to the rotary kiln and then discharged to the combustion section. Since the rotary kiln furnace and the after-burning unit are connected and connected, the process of discharging the coal gas generated from the rotary kiln furnace to the post-burning unit can be performed quickly, and the temperature of the coal gas can be prevented from being lowered . Further, since the post-combustion part and the rotary kiln are connected and connected, there is no problem that the coal gas leaks to the outside in the coal gas discharge step (S30).

The post-combustion step (S32) burns the coal gas discharged from the rotary kiln furnace to the post-combustion section through the heat provided by the at least one second burner. Through this, the coal gas is secondarily combusted in the burning furnace, and the temperature of the gas discharged from the burning furnace through the additional heat source is maintained at 800 to 900 ° C., and the coal tar and the combustible material are removed. That is, the coal gas burned in the post-combustion part is removed in the form of exhaust gas having a temperature of 800 to 900 ° C, and the coal tar and the combustible material are removed.

In the energy production step (S34), the exhaust gas discharged from the post-combustion section is accommodated in the heat energy utilization section, and energy is generated using the heat of the exhaust gas. That is, in the energy production step S34, coal tar and combustible materials are removed, and exhaust gas having a temperature of 800 to 900 DEG C is used to produce energy such as electricity necessary for living. A variety of energy production systems can be used to produce the energy needed for living by using heat such as a waste heat boiler or a thermoelectric generator, using heat energy.

As mentioned above, the pyrolysis step (S20) pyrolyzes low-grade coal in rotary kiln furnace to produce coal and coal gas. The pyrolysis step (S20) thermally decomposes the lower carbon to volatilize 50 to 95% of the volatile matter of the lower carbon to produce a volatile content of 5 to 50%. A fuel containing 5 to 50% volatile matter can be used as a direct lead-free fuel. When volatile matter contained in the volatile matter is less than 5%, burning becomes difficult due to low volatilization when the volatile matter is used as a lead-free fuel. In addition, when the volatile content contained in the vat exceeds 50%, there is a risk of spontaneous ignition due to volatilization. The produced oil is discharged through the outlet connected to the rotary kiln.

The cooling water discharged from the discharge portion is received by the cooling portion and cooled through the cooling step (S40). The reason for cooling the barrel is to prevent it from burning by contact with external oxygen.

The fuel stored in the fuel storage section (S42), which is stored in the fuel storage section cooled by the fuel cell cooling section, can be directly used as the lead-free fuel.

It should be noted that the embodiments disclosed in the drawings are merely examples of specific examples for the purpose of understanding, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: Rotary Kiln
20: Rotary Kiln
22: first opening
24: second opening
30:
32: First burner
40:
42: Hopper
44: Crushing module
46: Drying module
50:
52: the second burner
60:
62:
64:
66: Cyclone
70: Waste heat boiler
100: Coal gas generation system using low grade coal

Claims (14)

A rotary kiln furnished with a first opening portion and a second opening portion which are communicated with each other and which are opposed to each other and which pyrolyze the low grade coal and discharge it in the form of char and coal gas; A rotary kiln portion including at least one first burner for providing flame formation and heat, and a discharge portion connected to the second opening portion and discharging the bar generated in the rotary kiln furnace;
A transfer unit connected to the first opening to transfer the low grade coal to the rotary kiln;
And at least one second burner connected to the first opening and providing heat necessary for burning the coal gas discharged from the rotary kiln furnace, wherein the combustion gas is burned to remove the combustible material-removed exhaust gas A post-burning part for discharging in a form;
Wherein the coal gasification system comprises a low carbon coal gasification system. The method according to claim 1,
A turbo cooling unit for receiving and cooling the turbo discharged from the discharge unit, and a turbo storage unit for storing the turbocharged by the turbo cooling unit;
Further comprising a low-carbon coal gasification system. The method according to claim 1,
A heat energy utilization unit that receives the exhaust gas discharged from the downstream burner unit and generates energy using the heat of the exhaust gas;
Further comprising a low-carbon coal gasification system. The method according to claim 1,
Wherein the rotary kiln is installed so as to be inclined downwardly from the first opening portion toward the second opening portion and the low carbon burnt in the first opening portion by rotation is transported in the direction of the second opening portion, Wherein the coal gas discharged from the coal is transferred from the second opening to the first opening and discharged to the afterburning unit. The method according to claim 1,
Wherein the rotary kiln pyrolyzes the low-grade coal to volatilize 50 to 95% of the low-grade coal to produce the pulverized coal containing 5 to 50% of volatile matter. 6. The method of claim 5,
Wherein the rotary kiln has the low carbon retention time of 30 minutes to 90 minutes to produce the coal containing 5 to 50% volatile matter. The method according to claim 1,
The conveying portion
A crushing module for crushing the particle size of the low grade coal introduced from the hopper to 30 mm or less;
A drying module for drying the pulverized coal that has been pulverized through the pulverizing module;
Wherein the low-carbon coal-fired power plant is a coal gas fired power plant. The method according to claim 1,
And the exhaust gas discharged from the burner is 800 to 900 ° C. 3. The method of claim 2,
The coal gas generated from the coal discharged from the coal cooling unit is centrifugally separated to discharge fine particles separated from the coal gas to the coal storage unit, A cyclone discharging;
Further comprising a low-carbon coal gasification system. The method of claim 3,
Wherein the thermal energy utilization unit is a waste heat boiler or a thermoelectric generator. A transferring step of transferring the low-grade carbon charged into the transfer part to the rotary kiln via the first opening part connected to the transfer part;
A pyrolysis step of pyrolyzing the low carbon transferred to the rotary kiln furnace in the form of coal and coal gas through flame and heat provided by at least one first burner;
A coal gas discharging step of connecting the coal gas to the second opening part of the rotary kiln and connecting the coal gas to the combustion part;
Wherein the coal gas discharged into the afterburning portion is burned through the heat provided by the at least one second burner and the burned coal gas is burned after burning the combustible material in the form of an exhaust gas having a temperature of 800 to 900 DEG C step;
Wherein the low carbon is used as a raw material. 12. The method of claim 11,
An energy production step of generating exhaust energy by using heat of the exhaust gas accommodated in the thermal energy utilization part of the exhaust gas discharged from the downstream combustion part;
Further comprising the steps of: (a) heating the coal to a predetermined temperature; 12. The method of claim 11,
Wherein the pyrolysis step pyrolyzes the low carbon to volatilize 50 to 95% of the volatile matter of the low carbon to produce the crude oil containing 5 to 50% volatile matter. 12. The method of claim 11,
A cooling step of cooling the water discharged through the discharge unit connected to the rotary kiln by the rotary cooling unit;
Storing the cooled quartz in the quartz cooling unit in a quartz storage unit;
Further comprising the steps of: (a) heating the coal to a predetermined temperature;

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