KR102009175B1 - Sludge fueling system including drying device - Google Patents

Abstract

The present invention relates to a system of converting sludge into fuel, including a drying device, configured to convert sludge into pellet fuel so that the sludge can be used as fuel, and to effectively remove moisture from sludge to produce pellet fuel. According to the present invention, the system comprises: a mixing unit of generating a mixture by mixing sawdust with sludge; a stirring unit of receiving the mixture and stirring the mixture; a drying unit of receiving the mixture from the stirring unit and drying the mixture; and a forming unit of generating pallet fuel by extruding the mixture provided by the drying unit. The drying unit includes: a drying end into which the mixture is introduced and transferred; a heating source configured to provide heat to heat the mixture; and a heating duct coupled to an outer side of the drying end and configured to maintain heat generated by the heating source.

Description

Sludge fueling system including drying device

The present invention relates to a sludge fuelization system including a drying device, and more particularly, to pellet fuel for use as sludge as fuel, and to sludge fuelization including a drying device to effectively remove water from sludge to produce pellet fuel. It's about the system.

Sludge means sewage treated waste and contains a large amount of water and organic and inorganic substances. Such sludge is composed of more than 80% water and solids remaining after sewage treatment.

In particular, the sludge should be classified as waste, and waste treatment methods such as landfill and incineration should be applied. However, due to the high water content, the landfill and incineration should be preceded by a method of removing water.

In addition, even if the water is removed, more than 97% of the solids contained in the sludge is composed of organic matter, chlorine compounds generated by the chlorine (Cl) used in the purification process. Therefore, even when using waste treatment methods such as landfill or incineration, toxic compounds are generated when combusted at low temperatures, and problems such as soil contamination, leachate and odors are generated by toxic compounds and many organic substances at landfill.

Due to these problems, there is a need for a method for treating sludge, but it is not easy to remove the water contained in the sludge, which is an obstacle to sludge treatment.

For this reason, conventionally, a method of fueling sludge and a method of removing and treating water from sludge to bury sludge have been sought. However, there is a problem in that water removal is not easy due to the aggregation of sludge and the characteristics of solid particles which are fine particles. In addition, when the sludge and other materials are mixed, there is a problem in that the sludge is not uniformly mixed due to the aggregation phenomenon. Due to the sludge or other processes using the sludge mixture is not smooth, there is a problem that is not actually used.

Republic of Korea Patent Application Publication No. 10-2018-0027123 (Published March 14, 2018)

Accordingly, an object of the present invention is to provide a sludge fuelization system including a drying device for pelletizing sludge as a fuel and effectively removing water from the sludge for producing pellet fuel.

In order to achieve the above object, the sludge fuelization system according to the present invention comprises a mixing unit for generating a mixture by mixing the top and sludge; Stirring unit for receiving the mixture; A drying unit receiving the mixture from the stirring unit and drying the mixture; And a molding part for extruding the mixture provided by the drying part to generate pellet fuel, wherein the drying part comprises a drying end to which the mixture is fed and transported; A heating source providing heat for heating the mixture; And a heating duct coupled to the outside of the drying stage and maintaining heat generated from the heating source.

The sludge fuelization system including the drying device according to the present invention can effectively use the sludge as a pellet fuel by effectively removing the water of the sludge, thereby facilitating the treatment of the sludge, and using the sludge as a fuel for power generation and heating. It is possible to recycle and use resources.

1 is a block diagram schematically showing the configuration of a sludge fuelization system including a drying apparatus according to the present invention.
Figure 2 is a block diagram showing the configuration of a drying apparatus configured in the drying unit of Figure 1;
3 is an exemplary view schematically showing the drying apparatus of FIG.
4 is an exemplary view schematically showing an internal shape of a drying stage provided in the drying unit.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. In the accompanying drawings, it should be noted that the same reference numerals are used in the drawings to designate the same configuration in other drawings as much as possible. In addition, in describing the present invention, when it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Some features shown in the drawings are enlarged, reduced, or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

1 is a block diagram schematically showing the configuration of a sludge fuelization system including a drying apparatus according to the present invention.

Referring to FIG. 1, the sludge fuelization system according to the present invention includes a mixing unit 10, a stirring unit 20, a drying unit 30, and a forming unit 40.

The mixing unit 10 produces a primary mixture by mixing the sawdust 1 and the sludge 5, which is a material material. The mixing unit 10 serves to primarily mix so that the sawdust 1 and the sludge 5 are evenly distributed. In general, the mixture of sludge (5) and sawdust (1) is well mixed due to the surface tension and the agglomeration between the particles of the sludge (5) due to the high water content of the sludge (5) and the floating phenomenon caused by the small mill of the sawdust (1) It won't work. Therefore, in the mixing section 10, the sawdust 1 and the sludge 5 is beaten or kneaded so that the particles of the sludge 5 in contact with the sawdust 1 as possible, through which the sawdust 1 and the sludge 5 ) Is mixed to form a primary mixture.

To this end, the mixing part 10 is installed in the cylindrical mixing stage and the mixing stage and is provided with a mixing means capable of repeatedly rubbing the sawdust (1) and sludge (5) material material while conveying the mixture in one direction. It can be configured as. In one example, the mixing means may be a screw-shaped blade is formed continuously on the shaft.

Here, the sawdust (1) of the present invention is a dry state having a water content of 10% or less and 15% or less may be manufactured to a particle size of 5mm or less. Such sawdust (1) is not produced by recycled wood, it may be produced by processing natural wood. In addition, the sludge 5 may be a water content of 75 or more and 85% or less. Here, the water content suggested in the present invention may be adjusted to be close to the numerical value suggested in the actual process, and may not have a precisely designated numerical value. It is preferable that only the numerical values set forth in the present invention are numerical values capable of obtaining optimal results. That is, the moisture content of the sawdust may be 10% or more and 15% or less in the actual manufacturing process, the water content of the sludge may be in the range of 75% or more and 85% or less.

The stirring unit 20 agitates the primary mixture supplied from the mixing unit 10 and transmits the mixed mixture to the drying unit 30. The stirring unit 20 serves to increase the mixing ratio and mixing uniformity of the primary mixture, and to make the size of the particles small and even. To this end, the stirring unit 20 continuously agitates the primary mixture for a predetermined process time by means such as a paddle. The stirring unit 20 agitates the primary mixture by using a method different from the mixing method of the mixing unit 10.

In one example, the stirring unit 20 may be configured to include a paddle for rotating at a constant speed as well as repeatedly stirring the primary mixture by rotating by the rotary shaft, the rotary shaft installed inside the cylindrical stirring stage and the stirring stage. Through this, the stirring unit 20 induces the collision of the paddle and the primary mixture, the collision between the particles of the mixture, the collision of the mixing means and the mixture to produce a secondary mixture having a smaller particle size than the primary mixture. By such agitation, the secondary mixture is smaller than the primary mixture and has particles of even size. Here, the specific form of the stirring unit 20 is not limited to the present invention only by being presented as an example for understanding the technology.

The drying unit 30 heats and dries the secondary mixture supplied by the stirring unit 20, and generates a dry mixture in which the moisture content of the mixture is adjusted to a moisture content suitable for molding by drying. To this end, the drying unit 30 heats the secondary mixture by indirect heating, and discharges steam generated by the heating to produce a dry mixture. The drying unit 30 is to dry the secondary mixture to lower the water content of the mixture to 10% or more and 12% or less. Detailed configuration of the drying unit 30 will be described below in detail with reference to other drawings.

The molding part 40 is injection molding a dry mixture supplied from the drying part 30 to produce pellet fuel. The molding part 40 may include an injection mold for injection molding, a press part for pressing the dry mixture on the injection mold, and a supply part for supplying the dry mixture between the press part and the injection mold. Through this, the molding unit 40 may form the dry mixture in the form of pellets, but may also be formed in the form of compressed carbon having a larger size than the pellets.

FIG. 2 is a block diagram showing a configuration of a drying apparatus included in the drying unit of FIG. 1. 3 is an exemplary view schematically showing the drying apparatus of FIG. 2.

The drying unit 30 may include a drying stage 50: 50a to 50n, a heating unit 53, a suction unit 55, and an injection unit 60.

In the drying stage 50, the secondary mixture is accommodated and transferred, and drying of the secondary mixture is performed by heat provided by the heating unit 53. To this end, the drying end 50 is formed in a cylindrical or pipe shape to form a space therein, and is formed in a can shape in which both ends are closed. An inlet 81 is provided at one end of the drying end 50, and an outlet 84 is provided at the other end. Drying stage 50 may be configured in multiple stages, it may be arranged in a zigzag form as shown in FIG. This allows the inlet of the x-th stage to communicate with the outlet of the x-th stage, and the outlet of the x-th stage to communicate with the x + 1 th inlet (where x is more than 2 natural water).

Heat is evenly transferred to the secondary mixture inside the drying stage 50, and the water present between the secondary mixture can be discharged into the empty space inside the drying stage 50, and the secondary mixture is inserted into the next inlet. A paddle device for transferring in the direction of the outlet port 84 from the 81 may be provided. To this end, a rotating shaft may be installed in the drying stage 50 in parallel with the moving direction, and a plurality of paddles may be coupled to the rotating shaft. In addition, a driving unit 83 for rotating the paddle device may be provided at one side of the drying end 50.

The drying stage 50 is configured to conduct heat through external heating of the drying stage 50 without directly supplying heat supplied by the heating unit 53 to the secondary mixture. To this end, the heating unit 53 is installed outside the drying stage 50. Through this, the drying stage 50 prevents ignition of the internal dust generated during direct heating and carbonization of the secondary mixture.

In addition, the drying stage 50 is coupled to the suction unit 55 for ejecting the steam and dust generated during the drying process to the outside. Specifically, the suction nozzle 59 penetrating the body of the drying stage 50 is coupled to each drying stage 50, and the suction nozzle 59 is connected to the inhaler 56 through the suction pipe 58. Through this, the drying stage 50 quickly discharges the moisture and dust therein, thereby enabling rapid drying by the heat supplied from the heating unit 53.

The heating unit 53 supplies heat for drying the secondary mixture that is transported and stirred through the drying stage 50. For this purpose, the heating unit 53 may include a heating source 71, a heat supply pipe 73, and a heating duct 75.

The heating source 71 is installed inside the heating duct 75 to directly heat the drying stage 50. At this time, the heating source 71 is installed inside the heating duct 75, so that the remaining heat used for direct heating is maintained by the heating duct 75 as much as possible to improve the heating efficiency. Alternatively, as shown, the heating source 71 may transfer heat generated in the heating duct 75 through the heat supply tube 73. The heating source 71 may generate heat by burning fossil fuels such as gas and petroleum, or may generate heat by electricity.

In particular, in the present invention, the heating source 71 may be heated to a different temperature for each drying stage (50). That is, by controlling the amount of heat supplied from the heating source 71 can be heated to a different temperature for each drying stage (50). This is because the moisture content is changed as the secondary mixture passes through each stage (50a to 50n) of the drying stage 50, the drying efficiency is lowered in the case of the stage having the lowest moisture content when heated to the same temperature for each stage. Therefore, by adjusting the temperature of the heating source 71 or by adjusting the heat supply from the heating source, the drying stage 50 having a high moisture content may be maintained at a high temperature, or may be dried by supplying a large amount of heat. To this end, the first stage 50a> second stage 50b...> N-th stage 50n may be maintained at a high temperature or a large amount of heat may be supplied.

In the drawing, only one heating source 71 is configured and an example is provided to supply heat to the heating duct 75 provided for each drying stage 50 by the heat supply pipe 73. However, this does not limit the present invention, and as described above, a heating source may be provided for each drying stage 50 to facilitate temperature control for each drying stage 50.

The heat supply pipe 73 connects the heating source 71 and the heating duct 75 to supply heat or hot air generated by the heating source 71 to the heating duct 75. The heat supply pipe 73 is omitted when the heating source 71 is installed inside the heating duct 75.

The heating duct 75 heats the drying end 50 by the heat supplied through the heat supply pipe 73. To this end, the heating duct 75 is coupled to the lower portion of the drying end 50, the interior is configured in the form of an empty duct. The heat supplied through the heating duct 75 heats the outside of the drying stage 50 to heat the secondary mixture inside the drying stage 50.

The suction unit 55 sucks steam and dust inside the drying stage 50 and discharges it to the outside of the drying stage 50 to collect the discharged dust. By discharging the steam by the suction unit 55 to lower the humidity inside the drying stage 50, it is possible to achieve a quick drying. To this end, the suction unit 55 may include a suction source 56, a main pipe 57, branch pipes 58: 58a and 58b, and a suction nozzle 59.

The suction source 56 generates suction force and collects the dust sucked into the suction nozzle 59 and transferred through the pipes 57 and 58. The suction source 56 may suck the steam and dust by varying the pressure or suction amount for each drying stage (50). To this end, the suction source 56 may be configured for each drying stage 50, and the present invention is not limited to the matters shown in the drawings. Specifically, the suction source 56 increases the suction amount and suction pressure of the drying stage 50 having a large amount of steam and dust, and lowers the suction amount and suction pressure of the drying stage 50 having a small amount of steam and dust. Inhalation of steam and dust can be achieved. To this end, a large suction amount or a high suction pressure may be applied in the order of the first stage 50a> the second stage 50b ...> the nth stage 50n.

Pipes 57 and 58 connect suction nozzles 59 and suction sources 56 provided in the respective drying stages 50 to transfer suction power to the suction nozzles 59, and the suctioned steam and dust are sucked from the suction source ( 56). The suction nozzle 59 may be provided in plural for each drying stage 50. In this case, the branch pipe 58 may be provided to connect the suction nozzle 59 and the main pipe 57.

The suction nozzle 59 is coupled through the body of the drying stage 50 to communicate the inside of the drying stage 50 with the pipes 57 and 58. The suction nozzle 59 is provided with a spray nozzle 63 of the spray unit 60.

The injection unit 60 injects compressed air to the suction nozzle 59 in order to prevent clogging of the suction nozzle 59. To this end, the injection unit 60 separates the dust accumulated in the hip-in nozzle 59 by spraying compressed air at regular intervals from the suction nozzle 59.

To this end, the injection unit 60 may include a compressor 61 for producing compressed air, a compressed air pipe 62, and a injection nozzle 63.

The compressor 61 may include a valve, and supplies compressed air to the compressed air pipe 62 by opening and closing the valve. To this end, the valve may be controlled by the controller to open and close at regular intervals.

The injection nozzle 63 penetrates into the suction nozzle 59 to inject compressed air toward the suction nozzle 59. To this end, the air injection direction of the suction nozzle 59 is installed to be sprayed into the drying end 50 from the suction nozzle (59). Through this, the dust accumulated in the inlet of the suction nozzle 59 in the process of suction of dust and steam is injected into the drying stage 50 at a high pressure, thereby preventing the clogging of the suction nozzle 59.

4 is an exemplary view schematically showing an internal form of a drying stage provided in the drying unit.

As described above, the drying stage 50 is composed of a plurality of stages and connected to each other. Through this, the secondary mixture is dried to discharge the dry mixture. To this end, each drying stage 50 has a means for drying and conveying the secondary mixture. FIG. 4 illustrates a configuration for drying and transporting the secondary mixture, and a coupling relationship between the suction part 55 and the injection part 60. In FIG. 4, the configuration of the drying unit 53 is omitted. However, as illustrated in FIG. 3, the drying unit 53 is installed on the outer surface of the main body 82 of the drying stage 50.

The drying stage 50 allows the secondary mixture to be rapidly dried to be dried for drying, preventing the aggregation of the secondary mixture and increasing the uniformity and mixing rate of the particles. To this end, the heating stage 53 is coupled to the drying stage 50 to apply heat to the drying stage 50 and the secondary mixture therein. To this end, the heating duct 75 of the heating unit 53 is coupled to the outside of the main body 82 of the drying stage (50).

In addition, inside the drying stage 50, paddles 83, 84, and 87 which are the same as or similar to those used in the stirring unit 20 as a means for transferring and restirring are configured. These paddle portions 83, 84, 87 may include a motor 83, a shaft 87, and a paddle 84.

The motor 83 is installed outside the main body 82 and coupled with the shaft 87 passing through the main body 82 to rotate the shaft 87.

The shaft 87 is installed at a position corresponding to the central axis inside the main body 82. When the main body 82 is formed in a long cylindrical shape, that is, a pipe shape to one side, it is disposed in this longitudinal direction. A plurality of paddles 84 are coupled to the shaft 87, and the shaft 87 rotates the paddle 84 by the rotational force of the motor.

The paddle 84 is formed extending from the outer circumference of the shaft 87 toward the inner circumference of the body 82. This paddle 84 comprises a pad 88 and a paddle shaft 85. The pad 88 is formed to be inclined, so that the secondary mixture is pushed out in one direction little by little. In addition, the pad 88 serves to strike the secondary mixture together with the inner surface of the main body 82. Through this, the pad 88 pulverizes the agglomerated mass of the secondary mixture generated in the drying process. The paddle shaft 85 mixes the secondary mixture so that heat is supplied between the particles of the secondary mixture, and the moisture retained by the particles can be discharged into the empty space of the drying stage 50.

On the other hand, the drying stage 50 has been described that the suction unit 55 for discharging the moisture inside. The suction part 55 is connected to the drying end 50 through the suction nozzle 59 provided in the pipes (57, 58) through the body (82). The suction nozzle 59 may be coupled to one or more places on the main body 82, and branch pipes 58 are provided to connect the pipe nozzles 57 to each of the suction nozzles 59. It can be configured to correspond. In particular, the coupling position of the suction nozzle 59 is preferably to be coupled to the upper portion of the drying end 50 is arranged horizontally as shown in FIG. Since the secondary mixture is located at the horizontally arranged lower end (ground direction relative to the shaft 87), in order to discharge only steam and dust, the suction nozzle 59 is located as far as possible from the secondary mixture inside the drying stage 50. ) Is placed.

The suction nozzle 59 allows the suction force generated by the suction source 56, such as a pump, to be transferred into the main body 82 of the drying stage 50 through the pipe 57 and the branch pipe 58 connected thereto. As a result, the sucked dust and steam are delivered to the suction source 56 through the suction pipe 59 and the branch pipe 58 and the pipe 57.

Due to the continuous suction of dust and steam, the suction nozzle 59 accumulates secondary mixture at the inlet of the nozzle 59, and clogging or shrinkage of the suction nozzle 59 occurs due to accumulation of dust. Suction efficiency is lowered.

In order to prevent this, the injection nozzle 63 of the injection unit 60 is coupled to the suction nozzle 59. This injection nozzle 63 is provided for injecting the high pressure air supplied from the compressor 61 to the suction nozzle 59. To this end, the injection nozzle 63 is coupled through the injection nozzle 63, and the suction nozzle so that the compressed air injection direction of the injection nozzle 63 faces the main body 82, that is, toward the inlet of the suction nozzle. Coupled to (59).

Through this, the injection nozzle 63 injects compressed air supplied at regular intervals to the inlet of the suction nozzle 59 to prevent dust from accumulating inside the inlet of the suction nozzle 59 and the suction nozzle 59. do.

As described above, the drying stage 50 of the present invention may be coupled to the suction unit 53 and the injection unit 60 to discharge steam and internal dust, thereby allowing the secondary mixture to be dried efficiently. In addition, it is possible to continuously perform drying by preventing the blockage of the suction nozzle 59 that may occur in this process by the injection unit 60. In addition, by placing the suction nozzle 59 and the injection nozzle 63 outside the drying stage 50 in which the paddle 84 continuously rotates, the interference and breakage between devices can be maintained while maintaining the drying efficiency. It becomes possible to prevent.

Although illustrated and described in detail as a specific example to illustrate the technical idea of the present invention, the present invention is not limited to the same configuration and operation as the specific embodiment as described above, as many variations are within the scope of the present invention. It can be carried out in. Therefore, such modifications should also be regarded as belonging to the scope of the present invention, and the scope of the present invention should be determined by the claims below.

1: sawdust 5: sludge
10: mixing portion 20: stirring portion
30: drying part 40: molding part
50: drying stage 53: heating part
55: suction part 56: suction source
57: main pipe 58: branch pipe
59: suction nozzle 60: injection unit
71: heating source 73: heat supply tube
75: heating duct 82: inlet
83: drive unit, motor 84: outlet

Claims (5)

Mixing unit for generating a mixture by mixing sawdust and sludge;
Stirring unit for receiving the mixture;
A drying unit receiving the mixture from the stirring unit and drying the mixture; And
And a molding part for extruding the mixture provided by the drying part to produce pellet fuel.
The drying unit
A drying stage into which the mixture is introduced and conveyed;
A heating source providing heat for heating the mixture; And
And a heating duct coupled to the outside of the drying stage and maintaining heat generated from the heating source.
The heating source is installed inside the heating duct,
The drying stage is composed of a plurality,
Each of the plurality of drying stages is a sludge fuel system comprising a drying device, characterized in that provided with a paddle for stirring and transporting the mixture therein. delete The method of claim 1,
The drying unit
Sludge fuelization system comprising a drying device, characterized in that for heating the plurality of drying stages to different temperatures, respectively. The method of claim 1,
The drying unit
Sludge fuelization system including a drying device, characterized in that the suction unit for sucking the moisture or suspended matter inside the drying stage is provided. The method of claim 1,
And a spraying unit having a suction nozzle in communication with the drying stage, the spray unit including a spray nozzle coupled to the suction nozzle and spraying compressed air into the nozzle hole of the suction nozzle. Sludge fueling system.

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