KR101836343B1 - System for manufacturing solid fuel using waste resources - Google Patents

Abstract

The present invention provides a system for manufacturing solid fuel from waste using waste gas recovery heat which inserts, in a dryer, heat obtained by heat exchange with waste gas to be used in drying a raw material, and which recollects the heat used in the drying to be used in a raw material mixer, thereby maximizing the use of waste heat. To solve the above problem, the system for manufacturing solid fuel from waste using waste gas recovery heat according to the present invention comprises: a steam boiler generating steam by using a heat source generated by incinerating fuel; a first heat exchanger collecting waste gas discharged from the steam boiler, and heating air; the dryer drying mixed waste by using the heated air heat exchanged by the first heat exchanger; a second heat exchanger heating water by using exhaust gas discharged after being used in the drying of the dryer; a mixer manufacturing a mixed raw material by mixing the waste, and inserting the manufactured mixed raw material in the dryer; and a molder molding the waste dried by the dryer into solid fuel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a solid fuel production system using waste gas recovery heat,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste solid fuel production system using waste gas recovery heat, and more particularly, to a waste solid fuel production system using waste gas recovery heat, A waste solid fuel production system using waste gas recovery heat that can maximize the use of waste heat by using waste heat.

Recently, the amount of waste generated by industrial development and population growth is increasing day by day. Waste causes environmental pollution, and the useful resources contained therein may be discarded, so it is important to efficiently treat and recover the wastes.

Accordingly, various technologies are being developed to use waste as fuel.

Solid Refuse Fuel (SRF) refers to solidified fuel that is made by recycling the waste to be disposed of. The amount of generated, shape, shape, and calorific value varies greatly depending on the source and time due to the nature of the waste. There are many difficulties to use as fuel. Therefore, it is transformed into a form suitable for use as a raw material and processed into a solid form by removing incombustible components such as moisture.

However, when a solid fuel is produced using such wastes, a separate facility for drying the wastes is required. Therefore, it takes a separate cost to dry and solidify the waste, have.

Various techniques have been developed to improve this.

As one of such techniques, a waste disposal system using self-energy is disclosed in Patent Publication No. 10-0734092.

This technology purifies water and odor generated from food waste to prevent odor and water pollution, recovers incineration energy, generates steam through a waste heat boiler, uses it as a dry heat source, and uses only its own energy source And uses its own energy not to use fuel.

In addition, JP-A-10-0965932 discloses an efficient drying and odor control system for organic wastes.

The present invention is characterized in that odor generated during the treatment of organic wastes is deodorized and burned by a direct combustion method, and waste heat generated upon deodorization and incineration is supplied to a steam boiler so that waste heat can be recycled.

In addition, Japanese Patent Application Publication No. 10-1534197 discloses a sludge resource recovery system using waste heat and waste gas recovery heat.

The above-mentioned technology can dry the sludge and use it as fuel together with the waste resources, and dry the dehydrated sludge with the thermal energy which burns the waste resources and the sludge, so that the treatment can be stably performed by the indirect heating and drying method. And recycling various heat sources generated during the process and discarded.

However, the above technologies are advantageous for recovering waste gas to remove odors, but they are not applicable to a system for manufacturing a solid fuel by making it a resource.

KR 10-0734092 B1 (June 25, 2007) KR 10-0965932 B1 (June 16, 2010) KR 10-1534197 B1 (June 30, 2015)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art, and a problem to be solved by the present invention is to provide a heat exchanger in which waste heat is exchanged in a dryer to be used for drying a raw material, And a waste gas solid fuel production system using the waste gas recovered heat that can be recovered and used for the raw material mixer.

It is another object of the present invention to provide a waste solid fuel production system using waste gas recovery heat that minimizes the generation of odors during the drying of waste.

In order to solve the above problems, a waste solid fuel manufacturing system using waste gas recovering heat according to the present invention includes a steam boiler for generating steam using a heat source generated by incineration of fuel; A first heat exchanger for recovering waste gas discharged from the steam boiler to heat the air; A dryer for drying the mixed waste using heated air heat-exchanged in the first heat exchanger; A second heat exchanger for heating the water using the exhaust gas used for drying in the dryer; A mixer for mixing the wastes to produce a mixed raw material and injecting the prepared mixed raw material into the dryer; And a molding machine for molding the waste dried in the dryer into a solid fuel.

Here, the water heated in the second heat exchanger is supplied to the mixer.

In addition, when surplus steam is generated in the steam boiler, the surplus steam is supplied to the dryer to be used as dry steam.

Further, the first heat exchanger may further include a combustion gas processing device for post-treating the exhaust gas used for air heating and exhausted.

In addition, the exhaust gas heated by the water in the second heat exchanger is supplied to the combustion air of the steam boiler.

According to the present invention, the waste gas can be recovered and used in a dryer to improve the drying efficiency of the waste, and the high temperature heat used in the dryer can be recovered and used in the raw material mixer, There is an advantage to be able to do.

In addition, since odor generated in the dryer is injected into the steam boiler, it is possible to prevent air pollution by suppressing the generation of odor.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram of a waste solid fuel production system using a waste gas recovery column according to the present invention; FIG.
BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a waste solid fuel production system using waste gas recovery heat.
3 is a schematic view of a first heat exchanger applied to a waste solid fuel production system using a waste gas recovery column according to the present invention.
4 is a configuration diagram of a second heat exchanger applied to a waste solid fuel production system using a waste gas recovery column according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention relates to a method for recovering waste by using waste heat recovery heat that can maximize the use of waste heat by allowing the waste heat to be heat exchanged in a dryer to be used for drying a raw material, And to provide a solid fuel production system.

FIG. 1 is a schematic diagram of a waste solid fuel production system using a waste gas recovery column according to the present invention, and FIG. 2 is a diagram illustrating a configuration of a waste solid fuel production system using a waste gas recovery column according to the present invention.

1 and 2, a waste solid fuel production system using a waste gas recovery column according to the present invention includes a steam boiler 10, a first heat exchanger 20, a dryer 30, a second heat exchanger (not shown) 40, a mixer 50, and a molding machine 60.

The steam boiler 10 generates steam by using a heat source generated by incineration of fuel. The steam boiler 10 has a structure different from that of the combustion chamber according to the type of fuel. Basically, And a combustion gas and water are alternately injected into the chamber and the pipe.

Bunker oil or gas has been mainly used as the fuel for the steam boiler 10, but the use of fossil fuels due to the rise in crude oil value and global warming has been depressed recently, and wood pellets and wood chips And solid fuels such as WCF have attracted attention.

The steam produced in the steam boiler 10 may be supplied to a steam generating system or a heating system.

The first heat exchanger 20 recovers waste gas discharged from the steam boiler 10 and heats the air. FIG. 3 illustrates a first heat exchanger 20 applied to the waste solid fuel production system using the waste gas recovery heat of the present invention. Fig.

Referring to FIG. 3, the first heat exchanger 20 includes a first housing 21 forming a closed space, a second housing 21 disposed inside the first housing 21 and being exhausted from the steam boiler 10 A waste gas flow pipe 22 disposed in a staggered shape to transfer waste gas, a radiating fin 23 installed orthogonally to the waste gas flow pipe 22, an air inlet 22 for supplying air into the first housing 21, an air inlet 24 and an air outlet 25 through which the air heated inside the first housing 21 is discharged.

At this time, an air supply for supplying air to the first housing 21 through the air inlet 24 or a heating air heated inside the first housing 21 through the air outlet 25 is discharged An air sucker for supplying the air into the apparatus, and the like.

The temperature of the waste gas discharged from the steam boiler 10 is about 250 to 270 ° C. The high temperature of the waste gas is dissipated in the first exchanger 20 by the waste gas flow pipe 22 and the radiating fin 23 and the heat is radiated through the air inlet 24 to the first housing 21 And the air is discharged through the air outlet 25.

The heated air discharged from the first heat exchanger (20) is supplied to a dryer (30).

The dryer 30 may be a paddle dryer, a disk dryer, a drum dryer, a thin film evaporator, or the like for drying the mixed waste by using heated air heat-exchanged in the first heat exchanger 20.

In this case, in the dryer, the disc dryer includes a body portion including a supply port provided at one side of the upper part and a discharge port for discharging the dried waste at the lower side of the other side to supply waste as a material to be dried, A heating air supply port provided in the body portion to supply air heated by the first heat exchanger 20 and a gas exhaust port provided in the body portion and discharging gas generated during drying, And a steam supply port for supplying steam to the disk.

Here, in the case where a disk dryer having a steam supply port is installed in the dryer, the steam supplied to the steam supply port may be surplus steam of the steam boiler 10.

Accordingly, the dryer 30 constructed as described above is dried by the indirect heat conduction method while the waste conveyed by the rotation of the disk comes into contact with the disk heated by the supplied steam, and the gas generated at the time of drying is discharged to the gas outlet The dried material is conveyed by the rotation of the disk and discharged to the discharge port.

The second heat exchanger 40 heats the water using the exhaust gas that is used for drying in the dryer 30 and exhausted. FIG. 4 is a schematic view showing the structure of the waste heat recovery system of the present invention, And the second heat exchanger.

Referring to FIG. 4, the second heat exchanger 40 includes a second housing 41 that forms a closed space, an exhaust gas passage 41 that is provided in the second housing 41 and is exhausted from the dryer 30, An exhaust gas flow pipe 42 disposed in a staggered shape and being arranged in a zigzag manner, a radiating fin 43 provided orthogonally to the exhaust gas flow pipe 22, and water (cold water) supplied into the second housing 41 And a water outlet 45 through which water heated inside the second housing 41 is discharged.

At this time, a pump for supplying cold water to the second housing 41 through the water inlet 44 or a pump for discharging water heated inside the second housing 41 through the water outlet 45 And the like.

The temperature of the exhaust gas discharged from the dryer (30) is about 70 to 80 ° C. The high temperature of the exhaust gas is dissipated in the second exchanger 40 by the exhaust gas flow pipe 42 and the radiating fins 43 and the heat is radiated through the water inlet 44, The cold water introduced into the water outlet 41 is heated and discharged through the water outlet 45.

The water heated by the heat exchange of the second heat exchanger (40) is supplied to the mixer (50), and the discharged exhaust gas is introduced into the combustion air of the steam boiler (10).

The moisture content of the dried waste dried and discharged through the dryer 30 should be in the range of 10 to 15% by weight.

Accordingly, the heat of the exhaust gas discharged from the dryer 30 is used to heat the water, and the exhaust gas exhausted is used for combustion of the steam boiler 10, so that the generation of odor generated during drying can be minimized In addition, there is an advantage that air pollution can be prevented.

The mixer (50) mixes waste to produce a mixed raw material, and the mixed raw material is put into the dryer (300). The waste introduced into the mixer is one or more raw materials selected from paper sludge, ≪ / RTI >

Paper sludge is generated after the final process of the paper mill, and is classified as a low carbon-based fuel, and about 10% is produced in paper production. For the paper sludge, the government banned marine dumping until February 2011 and announced the principle of land treatment through recycling. In 2016, marine dumping is prohibited.

In addition, coffee grounds refer to residues generated after coffee extraction occurring in the food industry making coffee, which is different from coffee grounds. The coffee waste is known to generate 270,000 tons a year, and it costs more than 30 billion won to dispose of it. Accordingly, various attempts have been made by coffee makers to use coffee grounds as raw materials.

Wood flour can also include sawdust, crushed wood waste and wood chips, as well as residues from crushing of wood.

At this time, when the solid fuel is produced using the wastes including paper sludge, coffee grounds and wood powder, the ratio of each of them is 80 to 120 parts by weight of the coffee grounds and 40 to 60 parts by weight of wood powder to 100 parts by weight of the paper sludge Lt; / RTI >

When the mixture is mixed in the mixer 50, a certain amount of moisture must be added to the mixture to facilitate mixing. When the mixture is uniformly mixed with the solid fuel, deviation due to the amount of heat generated can be reduced. Therefore, predetermined water may be injected into the mixer 50. In the present invention, the water introduced into the mixer (50) is heated by the second heat exchanger (40). Accordingly, as the heated water is input to the mixer 50, the mixed raw material is raised to a predetermined temperature, and the mixed raw material of the increased temperature is introduced into the dryer 30, thereby increasing the drying efficiency.

Depending on the design conditions, the water heated in the second heat exchanger (40) can be used to heat the mixing chamber of the mixer (50). That is, the heated water may flow to the outside of the mixing chamber to raise the temperature of the mixing chamber and increase the temperature of the mixing material by raising the temperature of the mixing chamber.

The molding machine 60 is configured to mold the waste dried in the dryer 30 into a solid fuel and extrudes and transports the dry waste introduced through the hopper and the hopper into which the dry waste discharged from the dryer 30 is introduced A driving motor for operating the extrusion screw, a forming plate for molding the dry waste extruded for the extrusion screw, and a blade for cutting the continuous solid discharged from the forming plate.

In the above configuration, the waste gas discharged from the first heat exchanger 20 may be post-treated and discharged to the atmosphere.

Accordingly, the waste solid fuel production system using the waste gas recovery heat of the present invention may further include a combustion gas processing device 70 for post-treating the exhaust gas used for air heating in the first heat exchanger 20 .

According to the present invention, the waste gas can be recovered and used in a dryer to improve the drying efficiency of the waste, and the high temperature heat used in the dryer can be recovered and used in the raw material mixer, There is an advantage to be able to do.

In addition, since odor generated in the dryer is injected into the steam boiler, it is possible to prevent air pollution by suppressing the generation of odor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: steam boiler 20: first heat exchanger
21: first housing 22: waste gas flow pipe
23: radiating fin 24: air inlet
25: air outlet 30: dryer
40: second heat exchanger 41: second housing
42: exhaust gas flow pipe 43: radiating fin
44: Water inlet 45: Water outlet
50: mixer 60: molding machine
70: Combustion gas processing device

Claims (5)

A steam boiler 10 for generating steam by using a heat source generated by incineration of fuel;
A first heat exchanger (20) for recovering waste gas discharged from the steam boiler (10) to heat the air;
A dryer (30) for drying the mixed waste using heated air heat-exchanged in the first heat exchanger (20);
A second heat exchanger (40) for heating the water by using the exhaust gas used for drying in the dryer (30) and discharged;
A mixer (50) for mixing the wastes to produce a mixed raw material and putting the prepared mixed raw material into the dryer (30); And
A molding machine (60) for molding the waste dried in the dryer (30) into a solid fuel;
/ RTI >
Water heated in the second heat exchanger (40) is supplied to the mixer (50), and the exhaust gas discharged is introduced into the combustion air of the steam boiler (10) to minimize the generation of odors generated during drying To prevent air pollution,
When surplus steam is generated in the steam boiler 10, the surplus steam is supplied to the dryer 30 to be used as dry steam,
A combustion gas treatment device 70 for post-treating the exhaust gas used in the air heating in the first heat exchanger 20 and exhausted;
Further comprising:
The exhaust gas heated and discharged from the second heat exchanger (40) is supplied to the combustion air of the steam boiler (10)
The moisture content of the dried waste dried and discharged through the dryer 30 is in the range of 10 to 15 wt%
The waste introduced into the mixer (50) is made of paper sludge, coffee grounds and wood powder,
The paper sludge, coffee grounds and wood flour are composed of 80 to 120 parts by weight of coffee grounds and 40 to 60 parts by weight of wood flour with respect to 100 parts by weight of paper sludge,
The water supplied from the second heat exchanger 40 to the mixer 50 may contain a certain amount of moisture in the waste mixed in the mixer 50 to facilitate mixing, The heated water in the second heat exchanger 40 is used for heating the mixing chamber of the mixer 50 so that the temperature of the mixing chamber And the temperature of the mixed raw material is increased by raising the temperature of the mixed raw material.
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