Solid fuel production system with heat treatment device for deodorizing solid fuel

Abstract

The present invention provides a solid fuel production system having a sewage sludge solid fuel deodorizing heat treatment device, including a mixer mixing sludge or an additive to produce a first mixture; a first dryer performing first drying in such a manner that the first mixture supplied from the mixer reaches a first moisture content; a second dryer producing a dried mixture of a second moisture content by heating and drying the first mixture of the first moisture content; a former molding the dried mixture by pressure molding; and a heat treatment device performing heat treatment on the solid fuel put into the inside after molding is completed to remove odor generated from the solid fuel molded in the former.

Description

Technical Field

[0001] This invention relates to a solid fuel preparation system with a heat treatment device for deodorizing solid fuel from sewage sludge, and more specifically, to a solid fuel preparation system with a heat treatment device for deodorizing solid fuel from sewage sludge, wherein heat is supplied to the solid fuel from sewage sludge to evaporate and volatilize internal and external moisture and remove odorous substances, thereby improving the durability and storability of the solid fuel by suppressing the possible rotting and odor that may occur during the transfer and storage of the solid fuel, and solid fuel with increased calorific value can be prepared. Background Technology

[0002] Sludge refers to the sediment produced by separating suspended solids from liquids through water purification and sewage / wastewater treatment. Sludge solid fuel refers to fuel products prepared using sewage sludge.

[0003] Wastewater sludge is generally treated by landfilling in the soil or dumping it into the ocean. However, with the entry into force of international conventions on preventing marine pollution, dumping wastewater and sludge into the ocean has been prohibited. Therefore, composting, fuel production, and solidification are used as treatment methods. Among these, fuel production accounted for 48.2% of the treatment in 2018. If the drying and fuel production facilities currently under development are put into operation, the proportion of fuel production will increase to 58.7%, becoming the largest treatment method.

[0004] Wastewater sludge solid fuel is similar in quality and characteristics to wood pellets used as co-fuel in power plants, and therefore can be used as an alternative fuel to replace imported wood pellets. The power generation from wastewater sludge solid fuel increased from 282,542 MWh in 2015 to 338,143 MWh in 2019, and the use of wastewater sludge solid fuel in power plants is gradually increasing.

[0005] In addition, the demand for new and renewable energy sources is expected to increase. Compared with solar and wind power, which have greater production instability and uncertainty, sewage sludge solid fuel has the advantage of being able to achieve a stable supply.

[0006] In the past, foul odors would be generated during the storage and drying of sewage and sludge, which would cause air pollution and complaints. Therefore, there are now deodorization technologies to treat the foul odors generated in the drying and fueling processes of sewage and sludge.

[0007] However, there are currently no technological examples of reducing the odor generated by solid fuels from sewage sludge, and their use is limited due to complaints and air pollution caused by the odor.

[0008] Therefore, the need for devices to solve such problems is becoming increasingly apparent. Summary of the Invention

[0009] In view of the above, the purpose of the present invention is to provide a solid fuel preparation system with a heat treatment device for deodorizing solid fuels for sewage sludge. This system can remove odorous substances by evaporating and volatilizing internal and external moisture through heating the solid fuel. This can improve the durability and storability of the solid fuel by suppressing the rotting and odor that may occur during the transfer and storage of the solid fuel, and can produce solid fuels that can increase calorific value.

[0010] A solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuel from sewage sludge, for achieving the objectives of the present invention as described above, is characterized by comprising: a mixer for mixing sludge or additives to produce a first mixture; a first dryer for first drying such that the first mixture supplied from the mixer reaches a first moisture content; a second dryer for producing a dried mixture with a second moisture content by heating and drying the first mixture with the first moisture content; a molding apparatus for molding the dried mixture into solid fuel by pressurizing it; and a heat treatment apparatus for heat treating the solid fuel after molding and placing it inside to remove the odor generated by the solid fuel molded in the molding apparatus.

[0011] The present invention is characterized in that the heat treatment apparatus comprises: a main body having a solid fuel inlet on one side of the upper part, an exhaust port on the other side of the upper part, and a solid fuel outlet on one side of the lower part for discharging the heat-treated solid fuel to the outside; a heat medium supply pipe, which is stacked along the height direction and arranged in a zigzag pattern along the width direction and extends along the length direction inside the main body to heat treat the solid fuel fed into the interior of the main body through the solid fuel inlet to remove odor; and a mesh conveyor, which is stacked along the height direction of the main body and extends along the length direction for placing the solid fuel and conveying the solid fuel fed into the interior of the main body along the length direction of the main body and along the space between the heat medium supply pipes.

[0012] Furthermore, an exhaust pipe connected to the exhaust port can be provided on one side of the main body to discharge the gas generated during the heat treatment of the solid fuel through the heat medium supply pipe.

[0013] Furthermore, a plurality of first tar removal sections may be provided on the lower side of the aforementioned mesh conveyor for the first collection and discharge of tar components separated from the aforementioned solid fuel placed on the aforementioned mesh conveyor.

[0014] In addition, a plurality of second tar removal sections may be provided on the outer side of the main body, which are connected to the exhaust gas discharge pipe and are erected vertically along the height direction of the main body, for a second collection and discharge of the tar components contained in the exhaust gas to the outside.

[0015] Furthermore, a transfer screw for quantitatively transferring the solid fuel can be provided inside the solid fuel inlet on the upper side of the main body.

[0016] Furthermore, a uniform adjustment plate may be provided between the upper inner surface of the main body near the solid fuel inlet and the mesh conveyor. One end of the plate is fixed to the upper inner surface of the main body and extends downward, while the other end is spaced at a predetermined distance from the upper surface of the mesh conveyor, so that the solid fuel conveyed along the mesh conveyor is quantitatively stacked on the upper surface of the mesh conveyor.

[0017] Furthermore, a return screw may be provided at the rear end of the aforementioned transfer screw, which can selectively rotate in the same or opposite direction to the rotation direction of the aforementioned transfer screw to control the supply of the aforementioned solid fuel.

[0018] Furthermore, a temperature sensor and a timer may be provided on one side of the outer surface of the main body. The temperature sensor is used to measure the internal temperature of the main body that rises due to the heat medium supply pipe, and the timer is used to measure the time for the solid fuel to be heat-treated by the internal temperature of the main body.

[0019] Furthermore, the solid fuel that has been heat-treated in the aforementioned heat treatment apparatus can be cooled in a separate cooler.

[0020] As described above, the solid fuel preparation system of the present invention, which has a heat treatment device for deodorizing solid fuels for sewage sludge, can evaporate and volatilize internal and external moisture and remove odorous substances by supplying heat to the solid fuel, thereby having the effect of suppressing the rotting and odor that may occur during the transfer and storage of the prepared solid fuel.

[0021] Furthermore, it can remove free water, physically bound water, non-flammable gases, and some low-calorific-value volatiles from the surface of solid fuel to reduce oxygen content, thereby increasing the calorific value of the prepared solid fuel.

[0022] Furthermore, by removing the hydrophilic hydroxyl groups on the surface of the solid fuel, structural deformation caused by moisture is reduced, and the surface coating prevents moisture absorption, thereby improving the durability and storability of the prepared solid fuel. Attached Figure Description

[0023] Figure 1This is a schematic diagram illustrating the structure of a solid fuel preparation system with a heat treatment device for deodorizing solid fuels for sewage sludge, according to an embodiment of the present invention.

[0024] Figure 2 This is a front view showing the structure of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuels for sewage sludge, according to an embodiment of the present invention.

[0025] Figure 3 This is a side view showing the structure of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuels for sewage sludge, according to an embodiment of the present invention.

[0026] Figure 4 This is a top view showing the structure of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuels for sewage sludge, according to an embodiment of the present invention.

[0027] Figure 5 This is a top view showing the internal structure of the feed inlet of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuels for sewage sludge, according to an embodiment of the present invention.

[0028] Symbol Explanation

[0029] 1: Heat treatment device; 10: Solid fuel preparation system; 20: Mixer; 30: First dryer; 40: Second dryer; 50: Forming device; 60: Cooler; 100: Main body; 110: Solid fuel inlet; 120: Exhaust port; 130: Solid fuel outlet; 200: Heat medium supply pipe; 300: Mesh conveyor; 400: Exhaust gas discharge pipe; 500: First tar removal section; 600: Second tar removal section; 700: Transfer screw; 800: Equalization adjustment plate; 900: Return screw. Detailed Implementation

[0030] Hereinafter, a solid fuel preparation system with a heat treatment device for deodorizing solid fuel for sewage sludge, according to an embodiment of the present invention, will be described in detail with reference to the accompanying drawings.

[0031] Figure 1 To briefly illustrate the structure of a solid fuel preparation system with a heat treatment device for deodorizing sewage sludge solid fuel according to an embodiment of the present invention, Figure 2 To show the front view of the solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuel from sewage sludge, according to an embodiment of the present invention, Figure 3 To show the structure of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuel from sewage sludge, according to an embodiment of the present invention, from the side view, Figure 4This is a top view illustrating the structure of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuel from sewage sludge, according to an embodiment of the present invention. Figure 5 This is a top view showing the internal structure of the feed inlet of a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuels for sewage sludge, according to an embodiment of the present invention.

[0032] As shown in the figure, a solid fuel preparation system 10 with a heat treatment device for deodorizing solid fuel from sewage sludge according to an embodiment of the present invention includes: a mixer 20 for mixing sludge 11 or additives 12 to produce a first mixture; a first dryer 30 for first drying such that the first mixture supplied from the mixer 20 reaches a first moisture content; a second dryer 40 for producing a dried mixture with a second moisture content by heating and drying the first mixture with the first moisture content; a molding device 50 for molding the dried mixture into solid fuel by pressurizing it; and a heat treatment device 1 for heat treating the solid fuel after molding and placing it inside to remove the odor generated by the solid fuel molded in the molding device 50.

[0033] The following description only illustrates the structures necessary for explaining the structure of this invention.

[0034] That is, when constructing a solid fuel preparation system with a heat treatment device for deodorizing sewage sludge solid fuel, additional devices such as storage hoppers, boilers for heating, steam pipes, air pumps, and elevators can be configured. However, the omitted structures are matters that can be easily selected and applied by those skilled in the art, and do not mean that the undescribed structures are unnecessary.

[0035] First, the mixer 20 kneads or agitates the sludge 11 or additive 12 to generate a first mixture. In this case, the sludge 11 and additive 12 may not mix smoothly due to the aggregation of sludge 11 and the floating phenomenon caused by the low density of additive 12. Therefore, the mixer 20 mixes the sludge 11 and additive 12 particles to maximize contact and eliminate the aggregation of sludge 11.

[0036] Through this mixer 20, the mixing rate and uniformity of the first mixture are improved, and the mixed particles are small and uniform. As a result, the mixer 20 can reduce the moisture content of the sludge 11 for the first time.

[0037] Therefore, the interior of the mixer 20 can have a mixing unit for stirring and kneading the mixture. This mixing unit can be a structure in which spiral-shaped plates are continuously formed on a shaft, or it can be a structure with multiple connecting plates.

[0038] For example, additive 12 is in a dry state with a moisture content of more than 10% and less than 15%, and the particle size is less than 5 mm.

[0039] This additive 12 may include a bulking agent and an amendment that increase the volume of the sludge 11 without affecting its properties.

[0040] The moisture content of sludge (11) can be above 75% and below 85%.

[0041] Therefore, the moisture content described in this embodiment is close to the value required in the actual process and may not be an exact specified value. However, preferably, the values ​​mentioned in this embodiment should be understood as those that can derive the best results.

[0042] The first dryer 30 receives the first mixture generated by the mixer 20 and dries it. That is, the drying process of reducing the moisture content of the first mixture to a first moisture content is carried out in the first dryer 30.

[0043] This first dryer 30 can dry the first mixture in a manner that achieves a first moisture content in various ways.

[0044] For example, the first dryer 30 can utilize the heat generated from burning fuels such as gas or petroleum for drying, or it can utilize natural light for drying. Alternatively, the first dryer 30 can utilize the heat generated from the decomposition or oxidation of organic matter in the first mixture during the reaction with microorganisms or oxygen for drying.

[0045] Furthermore, a hot dryer can also be used as the first dryer 30, and both the first dryer 30 and the second dryer 40 can be composed of hot dryers.

[0046] However, in one embodiment of the present invention, it is assumed that the first dryer 30 is a bio-drying device that uses microorganisms for drying and the second dryer 40 is a thermal drying device.

[0047] Therefore, the first dryer 30 induces the metabolism of aerobic microorganisms by supplying oxygen (O2) from the air into its interior, and dries the first mixture by means of the metabolic heat generated when organic matter is decomposed into carbon dioxide (CO2), water (H2O), and ammonia (NH3) through metabolism. Thus, the first dryer 30 dries the sludge 11 in such a way that the moisture content is approximately 75% to 85% of the sludge, reaching a moisture content of 35% to 40% as a first moisture content.

[0048] The aforementioned first moisture content is calculated experimentally and can vary depending on the scale and drying efficiency of the first dryer 30.

[0049] If the first moisture content is set to 40% or higher, problems such as decreased efficiency and increased drying time may occur in the drying step carried out by the second dryer 40. That is, the fuel consumption used for heating and drying in the second dryer 40 may increase.

[0050] Conversely, if the first moisture content is set to less than 35%, the size of the first dryer 30 will increase, resulting in a decrease in drying efficiency due to the longer time the first mixture remains in the first dryer 30. That is, adjusting the first moisture content will lead to an increase in fuel consumption for drying or the manufacturing and operating costs of the dryer, which will result in poorer economics or a decrease in efficiency due to the longer time the mixture remains in the first dryer 30.

[0051] Therefore, the initial moisture content in the sludge fuel system 10 is subject to adjustment based on the structure of the dryer, and thus the moisture content is not limited to being more than 35% and less than 40%.

[0052] The second dryer 40 dries the first mixture supplied from the first dryer 30 to achieve a second moisture content, thereby generating a dried mixture, wherein the second moisture content is a moisture content that can be formed into fuel.

[0053] To this end, the second dryer 40 is internally equipped with a heat transfer unit for heating and drying the first mixture. Furthermore, the second dryer 40 is equipped with a stirring unit that can maintain the mixing state by preventing the first mixture from separating into sludge 11 and additive 12 during heating, and stir the mixture in a manner that increases the contact rate between the heat transfer unit and the mixture.

[0054] The second dryer 40 employs an indirect heating method implemented with the aid of a heat source to prevent carbonization or oxidation and increase heat utilization efficiency during the drying process of the first mixture with the first moisture content.

[0055] For this purpose, the second dryer 40 allows a heat medium supplied from a heating device such as a boiler or heater through a pipe to pass through its interior, thereby heating and drying the mixture. Furthermore, the second dryer 40 may also include a discharge unit for discharging moisture and dust from inside the second dryer 40 generated during the heating and drying process.

[0056] The second dryer 40 produces a dried mixture with a second moisture content by drying the first mixture, and supplies the dried mixture to the forming unit 50. This second dryer 40 can also be configured in a continuous feeding and discharging manner, like the first dryer 30.

[0057] If a continuous input and output method is adopted, the drying efficiency will decrease due to the increased size of the second dryer 40 and the increased fuel consumption. Therefore, considering efficiency, the second dryer 40 can be operated in the following manner: performing drying of a preset set capacity unit, and after discharging all the dried mixture, receiving the first mixture again. However, the set capacity unit drying method is only more conducive to drying and does not mean that a continuous input and output method cannot be adopted, and the present invention is not limited to this.

[0058] For this purpose, an intermediate storage tank (not shown) can be provided between the first dryer 30 and the second dryer 40 to store the first mixture discharged from the first dryer 30 for the first time.

[0059] The molding unit 50 produces solid fuel by pressurizing and molding a dried mixture supplied from the second dryer 40. In this case, the solid fuel produced can be pellet fuel.

[0060] This molding machine 50 can be an injection molding machine for performing pressure molding, and may include: an injection tool; a pressure unit that applies pressure to the dry mixture in the direction of the injection tool; and a supply unit that supplies the dry mixture between the pressure unit and the injection tool.

[0061] Of course, the molding unit 50 can not only produce the dry mixture into small pellets, but also pressurize it into large compressed carbon solid fuel.

[0062] On the other hand, the heat treatment apparatus 1 includes: a main body 100 having a solid fuel inlet 110 on one side of the upper part, an exhaust port 120 on the other side of the upper part, and a solid fuel outlet 130 on one side of the lower part for discharging the heat-treated solid fuel to the outside; a heat medium supply pipe 200, which is stacked along the height direction and arranged in a zigzag pattern along the width direction and extends along the length direction inside the main body 100, for heat-treating the solid fuel fed into the main body 100 through the solid fuel inlet 110 to remove odor; and a mesh conveyor 300, which is stacked along the height direction of the main body 100 and extends along the length direction for placing the solid fuel and conveying the solid fuel fed into the main body 100 along the length direction of the main body 100 and along the space between the heat medium supply pipes 200 and the heat medium supply pipes 200.

[0063] The main body 100 is a rectangular component with a certain internal space. Its function is to heat-treat the solid fuel by using the heat generated by the heat medium supply pipe 200 when the solid fuel is contained in the internal space.

[0064] The main body 100 has a solid fuel inlet 110 on one side of its upper part for feeding solid fuel that is to be heat treated, and an exhaust port 120 on the other side of its upper part for discharging the gas generated during the heat treatment of the solid fuel to the outside.

[0065] A single solid fuel inlet 110 can be formed at the upper edge of the main body 100, and in order to quickly discharge the generated gas, multiple exhaust ports 120 can be provided at multiple positions at a certain distance on the upper surface of the main body 100.

[0066] The main body 100 has a solid fuel outlet 130 on one side of the lower part, which discharges the heat-treated and deodorized solid fuel to the outside.

[0067] The heat medium supply pipe 200 is a component formed inside the main body 100, stacked along the height direction, arranged in a zigzag pattern along the width direction, and extending along the length direction, to heat-treat the solid fuel fed into the main body 100 through the solid fuel inlet 110 to remove odor.

[0068] The heat medium supply pipe 200 is a tubular component that is stacked inside the main body 100 and arranged in a zigzag shape along the width direction of the main body 100. In order for the heat medium passing through the heat medium supply pipe 200 to quickly raise the internal temperature of the main body 100, it is effective to arrange it in a zigzag shape along the width direction of the main body 100 and extend it along the length direction.

[0069] An inlet and an outlet are formed at one end and the other end of the heat medium supply pipe 200, respectively, to supply and discharge the heat medium. The heat medium is supplied through the inlet, moves along the heat medium supply pipe 200 and dissipates heat before being discharged through the outlet. It is then put into the heat medium boiler for heating and then supplied again.

[0070] The mesh conveyor 300 is stacked along the height direction of the main body 100 and extends along the length direction. It is used to place the solid fuel on the upper surface and to transfer the solid fuel into the interior of the main body 100 along the length direction of the main body 100 and along the space between the heat medium supply pipe 200 and the heat medium supply pipe 200.

[0071] The mesh conveyor 300 is a plate-shaped component with a porous mesh pattern formed on the plate surface. Driven by the mesh conveyor motor 310 located on one side of its surface, it forms a certain trajectory and moves in a cycle to transfer solid fuel placed on the upper surface.

[0072] Furthermore, the mesh conveyor 300 is formed in a porous mesh shape on the plate surface in order to remove the tar components contained in the solid fuel while it is being transported in a state where the solid fuel is placed on the mesh conveyor 300, and collect them through the porous structure to the first tar removal section 500 described below.

[0073] On the other hand, an exhaust pipe 400 connected to an exhaust port 120 is provided on one side of the main body 100, which can discharge the gas generated when the solid fuel is heat-treated through the heat medium supply pipe 200 to the outside.

[0074] The exhaust pipe 400 consists of multiple auxiliary pipes that are directly connected at one end to the exhaust port 120 and a single main pipe that is connected at multiple locations to the other end of the branch pipe.

[0075] While the solid fuel is heat-treated by this structure, the gas generated inside the main body 100 is discharged to the outside of the main body 100 through multiple branch pipes, and then flows into the deodorization equipment side in one go through the main pipe connected to the branch pipes.

[0076] The lower side of the mesh conveyor 300 has a plurality of first tar removal sections 500 for first collecting and discharging the tar components separated from the solid fuel placed in the mesh conveyor 300 to the outside.

[0077] This first tar removal unit 500 includes: a collection plate 510 disposed on the lower side of the mesh conveyor 300, with the central region positioned lower than the edge regions, such that the plate surface is inclined toward the center; and an oil removal pipe 520 connected to the lower part of the central region of the collection plate 510 and extending to the outside of the main body 100.

[0078] The upper surface of the collecting plate 510 has a complete opening, allowing tar components that detach from the surface of the solid fuel placed on the upper surface of the mesh conveyor 300 and fall through the porous surface of the mesh conveyor 300 to fall onto the collecting plate 510 and move along the slope toward the central area.

[0079] The tar components that have accumulated in the middle area of ​​the collecting plate 510 are drawn out to the outside of the main body 100 through the oil removal pipe 520, thereby removing the tar components for the first time.

[0080] On the outer side of the main body 100, there are a plurality of second tar removal sections 600 that are connected to the exhaust gas discharge pipe and are erected vertically along the height direction of the main body, for collecting and discharging the tar components contained in the exhaust gas to the outside for the second time.

[0081] The function of the second tar removal unit 600 is to collect the tar components contained in the exhaust gas generated during the heat treatment of solid fuel and discharge it to the outside.

[0082] This second tar removal unit 600 includes: a tar separation pipe 610, which is connected to the exhaust gas discharge pipe 400 and is installed vertically so that tar components separated from the exhaust gas can flow in; and a tar collection plate 620, which is installed at multiple positions along the height direction of the tar separation pipe 610 to collect tar components moving through the tar separation pipe 610.

[0083] On the other hand, a transfer screw 700 for quantitatively transferring the solid fuel is provided inside the solid fuel inlet 110 on the upper side of the main body 100. A return screw 900 is provided at the rear end of the transfer screw 700, which can selectively rotate and drive in the opposite or the same direction as the rotation direction of the transfer screw 700 to control the supply of the solid fuel.

[0084] The transfer screw 700 is rotated by the rotation drive of the transfer screw motor 710 located on one side to transfer the solid fuel fed into the interior through the solid fuel inlet 110 and cause it to fall to the side of the mesh conveyor 300.

[0085] When the amount of solid fuel transferred by the transfer screw 700 is too large, the return screw 900 located at the rear end of the transfer screw 700 returns the solid fuel to the transfer screw 700 side by rotating in the opposite direction to the rotation direction of the transfer screw 700.

[0086] When the amount of solid fuel transferred by the transfer screw 700 is appropriate, the return screw 900 rotates in the same direction as the transfer screw 700 to make the transferred solid fuel fall onto the upper surface of the mesh conveyor 300.

[0087] Furthermore, a uniform adjustment plate 800 is provided between the upper inner surface of the main body 100 near the solid fuel inlet 110 and the mesh conveyor 300. One end of the plate is fixed to the upper inner surface of the main body 100 and extends downward, while the other end is spaced at a predetermined distance from the upper surface of the mesh conveyor 300, so that the solid fuel conveyed along the mesh conveyor 300 is quantitatively stacked on the upper surface of the mesh conveyor 300.

[0088] The function of the equalization adjustment plate 800 is as follows: when the solid fuel placed on the upper surface of the mesh conveyor 300 passes through the equalization adjustment plate 800, the stacking height is adjusted to the same state as the distance between the end of the equalization adjustment plate 800 and the upper surface of the mesh conveyor 300, thereby evenly distributing the transferred solid fuel.

[0089] Effectively, this equalization adjustment plate 800 can adjust the stacking height of solid fuel by adjusting the spacing between its end and the upper surface of the mesh conveyor 300, thereby controlling the amount of solid fuel to be supplied.

[0090] Furthermore, although not shown, it is effective that a temperature sensor and a timer are provided on one side of the outer surface of the main body 100. The temperature sensor is used to measure the internal temperature of the main body 100 that rises due to the heat medium supply pipe 200, and the timer is used to measure the time for the solid fuel to be heat-treated by the internal temperature of the main body 100.

[0091] The internal temperature of the main body 100 can be measured by the temperature sensor described above, so as to keep the internal temperature of the main body 100 at the required temperature, and the timer described above can be used to measure the time for heat treatment of solid fuel, thereby achieving precise heat treatment of solid fuel.

[0092] Furthermore, after the solid fuel has undergone heat treatment and odor removal, it can be cooled in a separate cooler 60.

[0093] In order to remove the odor generated by the prepared solid fuel using a solid fuel preparation system with a heat treatment apparatus for deodorizing solid fuel from sewage sludge according to an embodiment of the present invention having the structure described above, the process of heat treating the solid fuel is described below.

[0094] First, if solid fuel that needs to be heat-treated is fed into the solid fuel inlet 110 provided on one side of the main body 100, the solid fuel is transferred to the return screw 900 side as the transfer screw 700 rotates. The return screw 900 and the transfer screw 700 rotate in the same direction, which will place the solid fuel on the upper surface of the mesh conveyor 300 and transfer it in a stacked form along the mesh conveyor 300.

[0095] During the process of transferring stacked solid fuels via mesh conveyor 300, if they pass through equalization adjustment plate 800, the stacking height is adjusted to the same height, thus enabling continuous and quantitative supply of solid fuels.

[0096] Furthermore, when the heat medium passes through the heat medium supply pipe 200, the internal space of the main body 100 is heated to a specified temperature. In this case, the temperature of the internal space should be 200°C to 250°C, preferably 230°C.

[0097] Inside the heated main body 100, the solid fuel is heat-treated while being transferred by the mesh conveyor 300. In this case, a heat treatment time of about 30 minutes is most effective.

[0098] As the solid fuel is conveyed along the mesh conveyor 300, the tar components adhering to its surface are separated. The separated tar components are removed by the first tar removal section 500, and the exhaust gas generated during the heat treatment process is discharged to the outside through the exhaust gas discharge pipe 400.

[0099] Furthermore, the tar components contained in the exhaust gas are collected in the second tar removal section 600 and further removed as the exhaust gas flows along the exhaust pipe 400 for exhaust purposes, thereby completing the thermal treatment of the solid fuel.

[0100] The solid fuel, which has undergone heat treatment and deodorization through the above process, is then cooled in a separate cooler 60, thereby completing the preparation of the solid fuel.

[0101] The solid fuel preparation system with the above-mentioned structure and heat treatment device for deodorizing solid fuel of sewage sludge can remove odorous substances by evaporating and volatilizing internal and external moisture through heating the solid fuel. In this way, the durability and storability of solid fuel can be improved by inhibiting the rotting and odor that may occur during the transfer and storage of solid fuel, and solid fuel with increased heat output can be prepared.

[0102] The above description only illustrates some preferred embodiments implemented according to the present invention. As is well known, the scope of the present invention should not be construed as being limited to the above embodiments. Technical ideas that are of the same origin as the technical ideas of the present invention described above are all included within the scope of the present invention.

Claims

1. A solid fuel production system having a thermal treatment device for deodorizing sewage sludge solid fuel, characterized by comprising: a mixer (20) for mixing sludge and an additive to produce a first mixture; a first dryer (30) for performing first drying of the first mixture supplied from the mixer (20) in such a manner that the first mixture reaches a first moisture content; a second dryer (40) for producing a dried mixture of a second moisture content by heating and drying the first mixture of the first moisture content; a former (50) for forming the dried mixture into a solid fuel by pressure forming the dried mixture; and a thermal treatment device (1) for performing thermal treatment of the solid fuel introduced into the inside thereof after the forming is completed to remove odor generated in the solid fuel formed in the former (50), the thermal treatment device (1) comprising: a main body portion (100) having a solid fuel inlet (110) at one side of an upper portion, an exhaust outlet (120) at the other side of the upper portion, and a solid fuel outlet (130) for discharging the solid fuel, which has been thermally treated, to the outside at one side of a lower portion; a heat medium supply pipe (200) formed by being stacked in a height direction inside the main body portion (100) and being arranged in a zigzag shape in a width direction and extending in a length direction to perform thermal treatment of the solid fuel introduced into the inside of the main body portion (100) through the solid fuel inlet (110) to remove malodor; and a mesh conveyor (300) provided to be stacked in the height direction of the main body portion (100) and extending in the length direction to place the solid fuel and to transfer the solid fuel introduced into the inside of the main body portion (100) in the length direction of the main body portion (100) and in a space between the heat medium supply pipe (200) and the heat medium supply pipe (200), a waste gas discharge pipe (400) is provided at one side of the main body portion (100) to be communicated with the exhaust outlet (120) to discharge gas generated when the solid fuel is thermally treated by the heat medium supply pipe (200) to the outside, a plurality of first tar removing portions (500) are provided at a lower side of the mesh conveyor (300) to collect and discharge tar components separated from the solid fuel placed on the mesh conveyor (300) to the outside for the first time, a plurality of second tar removing portions (600) are provided at an outside side of the main body portion (100) to be communicated with the waste gas discharge pipe (400) and to be vertically provided in the height direction of the main body portion (100) to collect and discharge tar components contained in the waste gas to the outside for the second time, and a transfer screw (700) for quantitatively transferring the solid fuel is provided inside the solid fuel inlet (110) at an upper side of the main body portion (100).

1. A solid fuel production system having a thermal treatment device for deodorizing sewage sludge solid fuel, characterized by comprising: a mixer (20) for mixing sludge and an additive to produce a first mixture; a first dryer (30) for performing first drying of the first mixture supplied fro ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The solid fuel production system with a sewage sludge solid fuel deodorizing thermal treatment device according to claim 1, characterized in that, ​ 3. The solid fuel production system with a sewage sludge solid fuel deodorizing thermal treatment device according to claim 2, characterized in that, A uniformity adjusting plate (800) is provided between the upper inner surface of the main body (100) near the solid fuel inlet (110) and the mesh conveyor (300), one end of which is fixed to the upper inner surface of the main body (100) and extends downward, and the other end of which is spaced apart from the upper surface of the mesh conveyor (300) by a predetermined distance, so that the solid fuel transferred along the mesh conveyor (300) is stacked on the upper surface of the mesh conveyor (300) in a uniform manner.

4. The solid fuel production system with a sewage sludge solid fuel deodorizing thermal treatment device according to claim 2, characterized in that, A return screw (900) is provided at the rear end of the transfer screw (700), which is selectively rotatably driven in the opposite or same direction of the rotation direction of the transfer screw (700) to control the supply amount of the solid fuel.

5. The solid fuel production system with a sewage sludge solid fuel deodorizing thermal treatment device according to claim 1, characterized in that, A temperature sensor for measuring the internal temperature of the main body (100) raised by the heat medium supply pipe (200) and a timer for measuring the time for which the solid fuel is heat-treated by the internal temperature of the main body (100) are provided at one side of the outer surface of the main body (100).

6. The solid fuel production system with a sewage sludge solid fuel deodorizing thermal treatment device according to any one of claims 1, 2 to 5, characterized in that, The solid fuel heat-treated in the heat treatment device (1) is introduced into a separate cooler (60) to be cooled.

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