JP2020172654A - Apparatus for converting sludge into fuel, system for converting sludge into fuel, sludge fuel utilization type factory and method for producing solid fuel - Google Patents

Abstract

To provide the apparatus for converting the sludge into the fuel, that can reduce costs for transporting dried sludge and can suppress odor and dust when transporting the dried sludge.SOLUTION: The present invention provides an apparatus 101 for converting the sludge into the fuel, a system 102 for converting the sludge into the fuel, a sludge fuel utilization type factory 103 and a method for producing the solid fuel, comprising: a sludge drying part 11, a granulating part 21, a conveying part 41 and a solid fuel boiler 51 in this order, wherein the granulation part 21 comprises forming at least the dried sludge 12 obtained in the sludge drying part 11 into the solid fuel 22, and the transport part 41 comprises transporting at least the solid fuel 22 to the solid fuel boiler 51.SELECTED DRAWING: Figure 1

Description

The present invention relates to a sludge fuel conversion device, a sludge fuel conversion system, a sludge fuel utilization type factory, and a method for producing solid fuel.

Various devices and methods are known as devices and methods for converting sewage sludge into fuel (see Patent Documents 1 to 6).

Patent Document 1 describes a method for producing a fuel using organic sludge, which comprises a dehydration step of dehydrating organic sludge to obtain dehydrated sludge, and mixing dehydrated sludge with at least one of wood chips and sawdust. A method for producing a fuel including a mixing step for making wood mixed sludge is described.
Further, Patent Document 1 is a sludge recycling system using manufactured fuel, in which organic sludge is dehydrated at a sludge treatment plant, the dehydrated sludge is transported to a fuel manufacturing facility by a vehicle, and dehydrated at the fuel manufacturing facility. A sludge recycling system is described in which sludge is mixed with at least one of wood chips and scraps to produce fuel, the fuel is transported by vehicle to a combustion facility, and the fuel is burned in the combustion facility.

Patent Document 2 includes a dephosphorization step for removing phosphorus contained in sewage sludge and a carbonization step for carbonizing the sewage sludge to make it into fuel. The dephosphorization step is performed after stirring the sewage sludge in an alkaline solution. The sewage sludge after dephosphorization obtained by filtration separation is used as carbonized fuel, while gypsum is added to the solution obtained by filtration separation to set the pH at the start of the reaction to 13.0. The main component is hydroxide apatite crystals, which are set to ~ 14.9, stirred at 40 to 100 ° C., and the pH at the end of the reaction is maintained at 12 or higher, and phosphoric acid in an alkaline solution is reacted with gypsum. A method for producing a biomass fuel for obtaining an adsorbent to be used is described.

Patent Document 3 describes that organic waste such as sewage sludge, paper sludge, and food sludge is dried to a moisture content of 20 to 60%, granulated, and carbonized at a carbonization temperature of 300 to 600 ° C. using a rotary kiln having an air-blocking atmosphere. Described is a method for producing a solid fuel which is carbonized for 4 to 22 minutes, then immediately cooled, and the cooled carbide is dried at a drying temperature of 70 ° C. or higher and 150 ° C. or lower and a drying time of 2 to 7 hours.

According to Patent Document 4, in the solid fuel derived from organic sludge obtained by carbonizing organic sludge after drying, the atomic number ratio H / C of hydrogen content and carbon content is 0.8 to 1.8. Solid fuels derived from organic sludge, which are solid fuels that burn with coal, are listed.

In Patent Document 5, the organic waste is anaerobic digested sludge or sludge generated in a sewage treatment plant, and the raw material for producing RPF (Refuse Paper & Plastic Fuel) is 50% by mass of plastic and / or paper in total. The water content of the organic waste is x (mass%), and the ratio of the mass of the organic waste to the total mass of the organic waste and the RPF production raw material (mass%) is y. Occasionally, a mixing step of adjusting the mixing ratio of the organic waste and the RPF production raw material so as to satisfy the following formula (I) to obtain a mixed raw material containing these, and a molding step of obtaining a molded product from the mixed raw material. A method for producing a solid fuel comprising ,, is described.
Equation (I): y ≦ −0.0436 × ² +1.7458x + 40.0

Patent Document 6 describes 20 organic wastes obtained by subjecting sewage sludge, human waste sludge, food waste, livestock waste, or digested sludge thereof to a drying treatment to adjust the water content to 20 to 50% by mass. A aging step of obtaining aging waste by holding it in a temperature atmosphere of ~ 65 ° C. for 12 to 120 hours, and a mixture containing the aging waste and an RPF production raw material containing 50% by mass or more of plastic and / or paper in total. A method for producing a solid fuel including a mixing step of obtaining a raw material and a molding step of obtaining a molded product from the mixed raw material is described.

Japanese Unexamined Patent Publication No. 2015-25054 Patent No. 5001594 Patent No. 43689964 JP-A-2007-19641 Patent No. 6022259 Patent No. 6047337

However, the methods described in Patent Documents 1 and 2 have a high transportation cost because the fuel produced from the dry sludge is transported to the combustion facility by the vehicle, and odor and dust are generated when the fuel produced from the dry sludge is transported. There was a problem to do.
The methods described in Patent Documents 3 and 4 are for producing carbonized solid fuel using a rotary kiln or the like after granulating organic waste such as sewage sludge, and transporting the obtained solid fuel to a combustion facility. It was not considered to reduce the transportation cost when doing so.
The methods described in Patent Documents 5 and 6 are for producing solid fuel obtained by mixing organic waste such as sewage sludge with RPF production raw materials to produce solid fuel, and when transporting the obtained solid fuel to a combustion facility. It was not considered to reduce the transportation cost of.

An object to be solved by the present invention is to provide a sludge fuel conversion apparatus capable of reducing the transportation cost of dry sludge and suppressing odor and dust when transporting dry sludge.
Another object to be solved by the present invention is to provide a sludge fuel conversion system and a sludge fuel utilization type factory equipped with the above sludge fuel conversion device.
Another object to be solved by the present invention is to provide a method for producing solid fuel that can be used in the sludge fuel conversion apparatus described above.

The configuration of the present invention, which is a specific means for solving the above problems, and the preferred configuration of the present invention are described below.

[1] A sludge drying section, a granulation section, a transport section, and a solid fuel boiler are provided in this order.
The granulated part molds the dried sludge obtained at least in the sludge drying part into solid fuel,
A sludge fuel conversion device in which a transport unit transports at least solid fuel to a solid fuel boiler.
[2] The sludge fuel conversion device according to [1], wherein the moisture content of the dry sludge is 5 to 40% by mass.
[3] The sludge fuel conversion device according to [1] or [2], wherein the transport unit transports RPF containing at least one of plastic, paper and paper sludge, or coal, and solid fuel to a solid fuel boiler.
[4] The granulated part molds only dry sludge into solid fuel,
The sludge fuel conversion device according to any one of [1] to [3], wherein the actual volume per grain of solid fuel is 0.1 to 100 cm ³ .
[5] The total net calorific value of the total fuel supplied to the solid fuel boiler as Q ^1, in the case of the net calorific value of the solid fuel and Q ^2, satisfying solid fuel following conditions 1A, the condition 1B or condition 1C The sludge fuel conversion device according to any one of [1] to [4].
Condition 1A: moisture content of the solid fuel is not more than 20 wt%, the value of 100% × ^Q 2 / ^{Q 1} is 40% or less.
Condition 1B: moisture content of the solid fuel is not more than 30 wt% more than 20 wt%, the value of 100% × ^Q 2 / ^{Q 1} is less than 20%.
Condition 1C: moisture content of the solid fuel is not more than 40 wt% more than 30 wt%, the value of 100% × ^Q 2 / ^{Q 1} is 10% or less.
[6] The sludge according to any one of [1] to [3], wherein the granulated portion molds at least one of plastic, paper and paper sludge, or a mixture of coal and dry sludge into solid fuel. Fueling device.
[7] The sludge fuel conversion apparatus according to [6], wherein the solid fuel contains coal in an amount of 15% by mass or less based on the total mass of the solid fuel.
[8] The granulation part molds at least one of plastic, paper and paper sludge, or a mixture of coal, a plant-derived deodorant, and dry sludge into solid fuel [1] to [3]. The sludge fuel conversion device according to any one of the above.
[9] The sludge fuel conversion apparatus according to [8], wherein the solid fuel contains 15% by mass or less of a deodorant or coal with respect to the total mass of the solid fuel.
[10] The sludge fuel conversion device according to any one of [6] to [9], wherein the actual volume per grain of solid fuel is 0.1 to 400 cm ³ .
[11] The total net calorific value of the total fuel supplied to the solid fuel boiler as Q ^1, in the case of the net calorific value of the solid fuel and Q ^3, satisfying solid fuel following conditions 2A, the condition 2B or condition 2C The sludge fuel conversion device according to any one of [6] to [10].
Condition 2A: The water content of the solid fuel is 20% by mass or less, and the value of 100% × Q ³ / Q ¹ is 60% or less.
Condition 2B: The water content of the solid fuel exceeds 20% by mass and is 30% by mass or less, and the value of 100% × Q ³ / Q ¹ is 30% or less.
Condition 2C: moisture content of the solid fuel is not more than 40 wt% more than 30 wt%, the value of 100% × ^Q 3 / ^{Q 1} is 15% or less.
[12] The sludge fuel conversion device according to any one of [1] to [11], wherein the transport unit can seal between the granulation unit and the solid fuel boiler.
[13] The sludge fuel conversion device according to any one of [1] to [12], wherein the solid fuel boiler is a biomass boiler.
[14] The solid fuel boiler is further equipped with an additional fuel input section.
The sludge fuel conversion device according to any one of [1] to [13], wherein the additional fuel contains at least one of coal, plastic, paper, wood chips and rubber.
[15] The sludge fuel conversion device according to any one of [1] to [14], further comprising a pipe for supplying steam obtained from a solid fuel boiler to a sludge drying section.
[16] The solid fuel boiler is further equipped with a generator,
The sludge fuel conversion device according to any one of [1] to [15], which supplies electric power obtained from a generator to at least one of a sludge drying section, a granulating section, and a transport section.
[17] The means for transporting dry sludge is other than a vehicle.
The sludge fuel conversion device according to any one of [1] to [16], wherein the means for transporting the solid fuel from the granulated portion to the solid fuel boiler is other than a vehicle.
[18] The sludge fuel conversion device and the sewage treatment plant according to any one of [1] to [17] are provided.
A sludge fuel conversion system that transports sludge obtained at a sewage treatment plant to a sludge drying section by vehicle.
[19] The sludge fuel conversion system according to [18], wherein the sludge fuel conversion device and the sewage treatment plant are located in the same administrative area.
[20] The sludge fueling device according to any one of [1] to [17] or the sludge fueling system according to [18] or [19].
With a factory
Equipped with piping to supply steam obtained from solid fuel boilers to the factory
A sludge fuel utilization type factory where the factory is a paper mill.
[21] The solid fuel boiler is further equipped with a generator,
The sludge fuel utilization type factory according to [20], which supplies electric power obtained from a generator to the factory.
[22] The process of drying sludge into dry sludge,
A method for producing a solid fuel, which comprises a step of granulating dry sludge into a solid fuel and satisfies the following conditions (1), (2) or (3).
Condition (1): Solid fuel consists only of dry sludge,
The actual volume of solid fuel per grain is 0.1 to 100 cm ³ .
Condition (2): The solid fuel consists of at least one of plastic, paper and paper sludge, or a mixture of coal and dry sludge.
The actual volume of solid fuel per grain is 0.1 to 400 cm ³ .
Condition (3): The solid fuel consists of at least one of plastic, paper and paper sludge, or a mixture of coal, a plant-derived deodorant, and dry sludge.
The actual volume of solid fuel per grain is 0.1 to 400 cm ³ .
[23] The method for producing a solid fuel according to [22], wherein the sludge is dried until the water content of the dried sludge reaches 5 to 40% by mass.

According to the present invention, it is possible to provide a sludge fuel conversion device capable of reducing the transportation cost of dry sludge and suppressing odor and dust when transporting dry sludge.
Further, according to the present invention, it is possible to provide a sludge fuel conversion system and a sludge fuel utilization type factory equipped with the above sludge fuel conversion device.
Further, according to the present invention, it is possible to provide a method for producing a solid fuel that can be used in the sludge fuel conversion apparatus described above.

FIG. 1 is a schematic view showing an example of a sludge fuel conversion system and a sludge fuel utilization type factory of the present invention provided with the sludge fuel conversion device of the first preferred embodiment of the present invention. FIG. 2 is a schematic view showing an example of the sludge fuel conversion system of the present invention and the sludge fuel utilization type factory provided with the sludge fuel conversion device of the second preferred embodiment of the present invention. FIG. 3 is a schematic view showing an example of the sludge fuel conversion system of the present invention and the sludge fuel utilization type factory provided with the sludge fuel conversion device of the third preferred embodiment of the present invention.

Hereinafter, the present invention will be described in detail. The description of the constituent elements described below may be based on typical embodiments or specific examples, but the present invention is not limited to such embodiments. In this specification, the numerical range represented by using "~" means a range including the numerical values before and after "~" as the lower limit value and the upper limit value.

[Sludge fuel conversion device]
The sludge fuel conversion device of the present invention includes a sludge drying section, a granulating section, a transport section, and a solid fuel boiler in this order, and the granulating section molds dry sludge obtained at least in the sludge drying section into solid fuel and transports it. The unit transports at least solid fuel to the solid fuel boiler.
According to the present invention, it is possible to provide a sludge fuel conversion device capable of reducing the transportation cost of dry sludge and suppressing odor and dust when transporting dry sludge.

For example, sewage-treated sludge is dried in a sludge drying section (so-called drying business, including carbonation) to make dry sludge, and then the obtained dry sludge is granulated into solid fuel to produce odor and dust. It is possible to use solid fuel for boiler input without using it as industrial waste.
Although not bound by any theory, specifically, by granulating dry sludge, it becomes easier to transport solid fuel to a solid fuel boiler via an integrated transport unit in a sludge fuel conversion device. Therefore, the transportation cost can be significantly reduced as compared with the transportation by a vehicle such as a truck. Further, by granulating the dry sludge, the surface area is reduced, so that the odor during transportation can be suppressed. Further, by granulating the dry sludge, it is possible to reduce the amount of small particle size (the particle size distribution can be made uniform), so that dust during transportation can be suppressed.

In a preferred embodiment of the sludge fuel conversion apparatus of the present invention, the solid fuel derived from dry sludge is directly transported to the solid fuel boiler, and the obtained steam or electric power (when the solid fuel boiler is equipped with a generator) is used as the sludge fuel of the present invention. Used in chemical equipment and sludge fuel utilization type factories. Therefore, the solid fuel derived from dry sludge can be effectively used. In the conventional methods and devices using dry sludge as solid fuel, the number of businesses having large-scale solid fuel boilers (biomass boiler, coal boiler, etc.) was limited, so the supply of solid fuel derived from the obtained dry sludge. Sometimes exceeded demand. Since the solid fuel derived from excess dry sludge is not produced in the preferred embodiment of the sludge fuel conversion apparatus of the present invention, it is not necessary to dispose of such excess solid fuel derived from dry sludge as industrial waste at a high cost. The cost at the time of disposal can also be reduced. In addition, the amount of waste landfill can be reduced.
Furthermore, by using the sludge fuel conversion device of the present invention, the solid fuel boiler can be operated using the dry sludge as a solid fuel (certified as a valuable resource), so that the dry sludge is not disposed of as industrial waste and the solid fuel boiler is used. Can be operated efficiently and CO ₂ emissions can be reduced. In recent years, it has been required for businesses to submit their own efforts for global warming countermeasures and CO ₂ emission reduction targets to public organizations as a "manifest" (declaration of action), and the sludge fuel of the present invention. The chemical device is useful for formulating such a "manifest".
Hereinafter, preferred embodiments of the sludge fueling apparatus of the present invention will be described.

<Structure of sludge fuel conversion device>
The configuration of the overall sludge fuel conversion device will be described.
In the present invention, the sludge fuel conversion device includes a sludge drying section, a granulating section, a transport section, and a solid fuel boiler in this order.
A preferred embodiment of the sludge fueling apparatus will be described with reference to the drawings.
FIG. 1 is a schematic view showing an example of a sludge fuel conversion system and a sludge fuel utilization type factory of the present invention provided with the sludge fuel conversion device (of the first preferred embodiment) of the present invention.
In FIG. 1, the sludge fuel conversion device 101 includes a sludge drying section 11, a granulating section 21, a transport section 41, and a solid fuel boiler 51 in this order.
The granulation portion 21 molds at least the dry sludge 12 obtained in the sludge drying portion 11 into the solid fuel 22.
The transport unit 41 transports at least the solid fuel 22 to the solid fuel boiler 51.
Each configuration of the sludge fuel conversion apparatus of the present invention will be described in order.

<Sludge drying part>
The sludge supplied to the sludge drying section is not particularly limited. For example, various organic sludges such as sewage sludge, paper sludge, building pit sludge, and food sludge can be mentioned. Among these, it is particularly preferable to use sewage sludge.
The sludge supplied to the sludge drying section is preferably dehydrated sludge that has been dehydrated to some extent. In the sludge drying section 11, it is more preferable to dry the sludge 3 which has been dehydrated to some extent by the sludge dewatering machine 2 of the sewage treatment plant 1 to obtain the dried sludge 12.
The water content of the dehydrated sludge is usually 70 to 85% by mass. The dehydrated sludge is sometimes referred to as a dehydrated cake, and may be solid or fluid. When the dehydrated sludge has fluidity, the degree of fluidity is not particularly limited, but it suffices if it can be sucked up by a suction car, a so-called vacuum car.

The drying performed in the sludge drying portion may be a carbonization treatment or a simple drying treatment without carbonization. It is preferably a simple drying process without carbonization.
The sludge drying section is not particularly limited, and may be a carbonized sludge drying section or a steam sludge drying section. It is preferably a steam sludge drying section. The sludge fuel conversion device has a pipe for supplying (returning) the steam obtained from the solid fuel boiler to the sludge drying section, and drying in the steam type sludge drying section using the returned steam can generate CO ₂ emissions. It is more preferable from the viewpoint that the amount of sludge can be reduced. In addition, fossil fuel such as heavy oil may be used as an auxiliary for heating. The drying temperature is preferably 100 to 300 ° C., more preferably 120 to 200 ° C., and particularly preferably 140 to 160 ° C.
CO ₂ emissions can be reduced if the sludge fuel conversion device has a wiring that supplies the electric power obtained from the generator to the sludge drying section and performs drying and transportation in the sludge drying section using the returned electric power. Preferred from the point of view.

When the water content of the obtained dry sludge at the outlet of the sludge drying section is 5 to 40% by mass, it is easy to granulate, and it flows before and after granulation and does not easily lose its shape. It is preferable from the viewpoint that the true calorific value can be easily controlled. From the viewpoint of facilitating granulation, it is more preferably 20 to 40% by mass. It is more preferably 25 to 35% by mass. The water content means a value obtained by holding 50 g of the object to be measured (for example, dry sludge) in an arbitrary dryer adjusted to 105 ° C. for 20 hours and calculating the mass reduced by this drying treatment as water. And.
The means for transporting the dried sludge between the sludge drying section and the granulation section is not particularly limited, and examples thereof include a belt conveyor, a screw feeder, pump pumping, and air feeding. In the present invention, the means for transporting dry sludge is preferably a vehicle other than a vehicle, and more preferably a belt conveyor. Further, a container for storing dry sludge or a temperature reducing device may be placed in the transport means.

<Granulation part>
In the present invention, the granulated portion molds the dried sludge obtained at least in the sludge drying portion into solid fuel.
The solid fuel may contain other components in addition to the dry sludge.
When the solid fuel contains other components other than the dry sludge, it is preferable to mix them into a mixed raw material and then granulate. The mixing method is not particularly limited, and for example, a conventionally known method can be applied. For example, a method using a conventionally known mixer, a mixing method using a rotary drive body, a mixing method using vibration, or the like can be applied.

The method for granulating is not particularly limited, and for example, a conventionally known method applied when producing RPF can be applied.
Specifically, for example, a solid fuel which is a molded product having a desired shape can be obtained by putting dry sludge or a mixed raw material into a mold of a briquette machine and compressing it while heating or after heating. When heating the mixed raw material, it is preferable to heat the mixed raw material at a temperature at which the plastic contained in the mixed raw material is softened.
It is also possible to obtain a molded product from a mixed raw material by using a conventionally known compression granulation type molding machine that can be heated or an extrusion granulation type molding machine. It is also possible to obtain a molded product from a mixed raw material using a conventionally known pellet mill. A conventionally known molding machine can be used.
In addition, mixing and granulation may be continuously performed in the granulation part, or may be granulated in the granulation part after using the mixed raw material in advance.
The sludge fuel conversion device has a pipe that supplies (returns) the steam obtained from the solid fuel boiler to the granulation section, and heating at the granulation section using the return steam reduces CO ₂ emissions. It is more preferable from the viewpoint of being able to do it. In addition, fossil fuel such as heavy oil may be used as an auxiliary for heating. The heating temperature is preferably 100 to 300 ° C, more preferably 120 to 200 ° C, and particularly preferably 140 to 160 ° C.
The sludge fuel conversion device has a wiring that supplies the electric power obtained from the generator to the granulation part, and the mixing, granulation, and transportation in the granulation part can be performed by using the returned electric power, which is the CO ₂ emission amount. It is preferable from the viewpoint that the amount of carbon dioxide can be reduced.

There is no particular limitation on the size of the solid fuel. It is preferable that the solid fuel has a size and shape similar to that of the RPF from the viewpoint that it can be provided to the solid fuel boiler while utilizing the existing transport means for transporting the RPF. The size and shape of a general RPF is, for example, a cylindrical shape having a diameter of 5 to 50 mm (preferably 6 to 40 mm). However, the present invention is not limited to general RPF size and shape aspects.
The components and sizes of the solid fuel are preferably the components and sizes specified in the first preferred embodiment, the second preferred embodiment and the third preferred embodiment described later.
However, in the present invention, fossil fuels such as coal may be further mixed, and a mixture of dry sludge and fossil fuel may be used as a solid fuel.

(First preferred embodiment)
The first preferred embodiment of the present invention is an embodiment in which the granulated portion molds only dry sludge into solid fuel, and the actual volume of the solid fuel per grain is 0.1 to 100 cm ³ . In the first preferred embodiment, the actual volume of the solid fuel per grain is preferably 1 cm ³ or more, more preferably 10 cm ³ or more, further preferably 20 cm ³ or more, and 30 cm ³ or more. It is particularly preferable to have. In the first preferred embodiment, the actual volume of the solid fuel per grain is preferably 90 cm ³ or less, more preferably 80 cm ³ or less, and particularly preferably 70 cm ³ or less.

In a first preferred embodiment of the present invention, the total net calorific value of the total fuel supplied to the solid fuel boiler and Q ^1, the net calorific value of solid fuel in the case of a Q ^2, solid fuel following conditions 1A, It is preferable to satisfy condition 1B or condition 1C. By adjusting the solid fuel containing dry sludge so as to satisfy these conditions, it is possible to obtain a high amount of heat while adjusting the heat of vaporization when the water becomes steam to achieve the same degree of combustion as coal. ..
Condition 1A: moisture content of the solid fuel is not more than 20 wt%, the value of 100% × ^Q 2 / ^{Q 1} is 40% or less.
Condition 1B: moisture content of the solid fuel is not more than 30 wt% more than 20 wt%, the value of 100% × ^Q 2 / ^{Q 1} is less than 20%.
Condition 1C: moisture content of the solid fuel is not more than 40 wt% more than 30 wt%, the value of 100% × ^Q 2 / ^{Q 1} is 10% or less.
The calorific value can be measured by a combustion heat measuring device (manufactured by IKA, model "C5003").

(Second preferred embodiment)
A second preferred embodiment of the present invention is an embodiment in which the granulated portion molds at least one of plastic, paper and paper sludge (so-called RPF production raw material), or a mixture of coal and dry sludge into solid fuel. ..
In the second preferred embodiment, the calorific value of the obtained solid fuel can be increased as compared with the solid fuel obtained in the first preferred embodiment. Here, the supply amount of the RPF production raw material for producing a high quality RPF is limited. According to a second preferred embodiment of the present invention, a high quality RPF size solid fuel obtained by molding an RPF production raw material and dry sludge into a solid fuel can be obtained.
It can be provided to a solid fuel boiler while utilizing the existing transport means for transporting RPF.
Furthermore, by using RPF-sized solid fuel, the surface area is reduced, so the odor during transportation can be suppressed, and the ones with a small particle size can be reduced (the particle size distribution can be made uniform), so dust during transportation can be suppressed. it can.

The RPF manufacturing raw material will be described.
RPF usually means a high-calorie solid fuel made from waste plastic or used paper, which is difficult to recycle materials, among industrial wastes. The RPF production raw material means a raw material containing waste plastic or used paper as a main component that can be used for producing such a normal RPF, but also includes an RPF that has already been used as a solid fuel. And. Further, any raw material containing plastic and / or paper as a main component (the total content of plastic and paper is approximately 50% by mass or more) shall be included in the RPF production raw material.
The type of plastic (including waste plastic; the same applies hereinafter) that can be contained in the RPF production raw material is not particularly limited, but a plastic that does not generate toxic gas by combustion is preferable. For example, polystyrene, polyethylene and polypropylene are preferably used. It is also preferable to use a chlorine-containing plastic such as vinyl chloride after taking measures against corrosion against chlorine and the like. In addition to plastic and paper (including used paper; the same applies hereinafter), examples of materials that may be contained in the RPF production raw material include waste wood.
Paper sludge is a residue containing pulp fibers generated in the middle of a manufacturing process of a paper mill, and is generated in a pulp washing process, a paper making process, a wastewater treatment process, and the like. It may be concentrated in a settling tank or a rotary screen and dehydrated with a screw press or a belt filter before being used as a raw material for RPF production.
In the present invention, it is preferable to use an RPF production raw material containing at least one of plastic, paper and paper sludge.
However, in the second preferred embodiment of the present invention, fossil fuels such as coal may be further mixed, and a mixture of RPF production raw materials, dry sludge and fossil fuels may be used as solid fuel.
In the second preferred embodiment, the solid fuel preferably contains coal in an amount of 15% by mass or less based on the total mass of the solid fuel from the viewpoint of adjusting the solid fuel so as to easily satisfy the conditions 2A, 2B or 2C. It is more preferably contained in an amount of 10% by mass or less, further preferably contained in an amount of 8% by mass or less, and particularly preferably contained in an amount of 7% by mass or less. In the second preferred embodiment, the solid fuel preferably contains 1% by mass or more of coal with respect to the total mass of the solid fuel from the viewpoint of adjusting the solid fuel so as to easily satisfy the conditions 2A, 2B or 2C. , 2% by mass or more is more preferable, and 3% by mass or more is particularly preferable.

The shape of the raw material for producing RPF is not particularly limited, and may be the same as the raw material that can be used for producing a conventionally known RPF. For example, if the plastic is contained in the RPF production raw material, the plastic may be in the form of a grain of about 0.1 to ⁵ mm and a film or string having an area of about 1 to 300 mm ² . For example, if the paper contains the raw material for producing RPF, the paper may be a piece of paper having an area of about 0.01 to 400 mm ² .
The water content of the RPF production raw material is not particularly limited, and may be the same as the raw material that can be used for producing a conventionally known RPF, for example, the water content may be 0 to 30% by mass. The water content of the RPF production raw material may be 1% by mass or more, preferably 20% by mass or less.

FIG. 2 is a schematic view showing another example of the sludge fuel conversion system of the present invention and the sludge fuel utilization type factory provided with the sludge fuel conversion device of the second preferred embodiment of the present invention. In the sludge fuel conversion device 101 of FIG. 2, the granulation unit 21 includes an RPF production raw material input unit (or coal input unit) 32, and the RPF production raw material (or coal) 33 can be input.

In the second preferred embodiment, the actual volume of the solid fuel per grain is preferably 0.1 to 400 cm ³ . In the second preferred embodiment, the actual volume of the solid fuel per grain is preferably 1 cm ³ or more, more preferably 10 cm ³ or more, further preferably 50 cm ³ or more, and 100 cm ³ or more. It is particularly preferable that there is, and most preferably 150 cm ³ or more. In the second preferred embodiment, the actual volume of the solid fuel per grain is preferably 350 cm ³ or less, more preferably 300 cm ³ or less, and particularly preferably 200 cm ³ or less.

In a second preferred embodiment of the present invention, the total net calorific value of the total fuel supplied to the solid fuel boiler and Q ^1, the net calorific value of solid fuel in the case of the Q ^3, solid fuel following conditions 2A, It is preferable to satisfy the condition 2B or the condition 2C. By adjusting the degree of mixing when solid fuel containing dry sludge and other additional fuel are mixed so as to satisfy these conditions, the heat of vaporization when the water becomes steam is adjusted to the same level as coal. It is possible to obtain a high amount of heat while adjusting the degree of combustion.
Condition 2A: The water content of the solid fuel is 20% by mass or less, and the value of 100% × Q ³ / Q ¹ is 60% or less.
Condition 2B: The water content of the solid fuel exceeds 20% by mass and is 30% by mass or less, and the value of 100% × Q ³ / Q ¹ is 30% or less.
Condition 2C: moisture content of the solid fuel is not more than 40 wt% more than 30 wt%, the value of 100% × ^Q 3 / ^{Q 1} is 15% or less.

(Third preferred embodiment)
In a third preferred embodiment of the present invention, the granulated portion molds at least one of plastic, paper and paper sludge, or a mixture of coal, a plant-derived deodorant, and dry sludge into solid fuel. It is an aspect.
In the third preferred embodiment, the calorific value of the obtained solid fuel can be increased as compared with the solid fuel obtained in the first preferred embodiment. Further, since the plant-derived deodorant has a high calorific value, in the third preferred embodiment, the calorific value of the obtained solid fuel can be increased as compared with the solid fuel obtained in the second preferred embodiment.
In the third preferred embodiment, the odor when transporting the solid fuel can be suppressed as compared with the solid fuel obtained in the first preferred embodiment or the second preferred embodiment.

FIG. 3 is a schematic view showing another example of the sludge fuel conversion system of the present invention and the sludge fuel utilization type factory provided with the sludge fuel conversion device of the third preferred embodiment of the present invention. In the sludge fuel conversion device 101 of FIG. 3, the granulation unit 21 includes an RPF production raw material input unit (or coal input unit) 32, and can input the RPF production raw material (or coal) 33 and the deodorant 34.

The deodorant derived from a plant is not particularly limited, and the deodorant is not particularly limited. For example, porous materials such as activated carbon; in the atmosphere by encapsulating odorous components, combining with such components to form salts, forming chelates to capture them, or neutralizing malodorous components. Substances that prevent volatilization into; various plant essential oils such as citrus, tree, herb, floral (eg, natural essential oils such as limonene, cineole, citral, linalool), mixtures thereof, and suitable thereof. Examples thereof include those dissolved in a medium. Examples of the plant-derived deodorant include Minato Tsukuri Co., Ltd., and the trade name "Sumeol L21". This deodorant does not contain substances corresponding to the PRTR method such as petrochemical essential oils, fragrances, surfactants, preservatives, and solvents, and is preferable from the viewpoint of carbon neutrality.
The plant-derived deodorant is preferably a porous material, more preferably activated carbon.
The plant-derived deodorant may be in the form of a solution or powder, but is preferably in the form of powder. More preferably, it is powdered activated carbon.

In the third preferred embodiment, the solid fuel preferably contains a deodorant or coal in an amount of 15% by mass or less based on the total mass of the solid fuel, from the viewpoint of suppressing the odor when transporting the dry sludge. It is more preferably contained below, more preferably 8% by mass or less, and particularly preferably 7% by mass or less. In the third preferred embodiment, the solid fuel preferably contains a deodorant or coal in an amount of 1% by mass or more, more preferably 2% by mass or more, and 3% by mass or more based on the total mass of the solid fuel. Especially preferable.
In the third preferred embodiment, the solid fuel preferably contains 15% by mass or less of the deodorant with respect to the total mass of the solid fuel, and contains 10% by mass or less, from the viewpoint of suppressing the odor when transporting the dry sludge. More preferably, it is more preferably 8% by mass or less, and particularly preferably 7% by mass or less. In the third preferred embodiment, the solid fuel preferably contains a deodorant in an amount of 1% by mass or more, more preferably 2% by mass or more, and particularly preferably 3% by mass or more, based on the total mass of the solid fuel. ..

The preferred range of at least one of the plastic, paper and paper sludge used in the third preferred embodiment of the present invention is the same as the preferred range of the second preferred embodiment.
However, in the third preferred embodiment of the present invention, a fossil fuel such as coal may be further mixed, and a mixture of an RPF production raw material, dry sludge, a plant-derived deodorant and a fossil fuel may be used as a solid fuel.
In the third preferred embodiment, the solid fuel preferably contains coal in an amount of 15% by mass or less based on the total mass of the solid fuel, from the viewpoint of adjusting the solid fuel so as to easily satisfy the conditions 2A, 2B or 2C. It is more preferably contained in an amount of 10% by mass or less, further preferably contained in an amount of 8% by mass or less, and particularly preferably contained in an amount of 7% by mass or less. In the third preferred embodiment, the solid fuel preferably contains coal in an amount of 1% by mass or more based on the total mass of the solid fuel from the viewpoint of adjusting the solid fuel so as to easily satisfy the conditions 2A, 2B or 2C. , 2% by mass or more is more preferable, and 3% by mass or more is particularly preferable.

In the third preferred embodiment, the actual volume of the solid fuel per grain is preferably 0.1 to 400 cm ³ . In the third preferred embodiment, the actual volume of the solid fuel per grain is preferably 1 cm ³ or more, more preferably 10 cm ³ or more, further preferably 50 cm ³ or more, and 100 cm ³ or more. It is particularly preferable that there is, and most preferably 150 cm ³ or more. In the third preferred embodiment, the actual volume of the solid fuel per grain is preferably 350 cm ³ or less, more preferably 300 cm ³ or less, and particularly preferably 200 cm ³ or less.

In a third preferred embodiment of the present invention, all the total net calorific value of the fuel as Q ^1, in the case of the net calorific value of the solid fuel and Q ^3, solid fuel above conditions 2A supplied to a solid fuel boiler , Condition 2B or Condition 2C is preferably satisfied. The more preferred range is the same as the more preferred range of the second preferred embodiment. By adjusting the degree of mixing when solid fuel containing dry sludge and other additional fuel are mixed so as to satisfy these conditions, the heat of vaporization when the water becomes steam is adjusted to the same level as coal. It is possible to obtain a high amount of heat while adjusting the degree of combustion.

<Transport section>
In the present invention, the transport unit transports at least solid fuel to the solid fuel boiler.
When the sludge fuel conversion device is provided with a sludge drying section, a granulating section, a transport section, and a solid fuel boiler in this order, the transport distance of the dry sludge and the solid fuel can be shortened, and the transport cost can be reduced. It is preferable from the viewpoint of reducing the surface and CO ₂ emissions. It is preferable that one end of the transport section is directly connected to the sludge drying section. Further, it is preferable that the other end of the transport portion is directly connected to the solid fuel boiler.
There are no particular restrictions on the means of transporting the transport section, that is, the means of transporting the solid fuel from the granulation section to the solid fuel boiler, but belt conveyors, screw feeders, air blowers (piping), pump pumps, roads, etc. it can. For example, it is preferable to transport the solid fuel to the upper part of the solid fuel boiler by a conveyor. The conveyor is preferably an RPF conveyor or a coal conveyor, from the viewpoint of utilizing existing equipment to reduce costs.
The conveyor is preferably a conveyor with measures against corrosion against chlorine and the like. As for the RPF conveyor, corrosion countermeasures against chlorine and the like are usually taken so that plastic containing vinyl chloride is used. On the other hand, coal conveyors often have insufficient measures against corrosion against chlorine and the like. Therefore, it is preferable to use an RPF conveyor rather than a coal conveyor.
On the other hand, it is preferable that the granulation part and the transportation part of the solid fuel boiler are on the same site from the viewpoint of suppressing the processing cost. Further, the transport unit is preferably not a public road, and more preferably not a road. Therefore, in the dry portion, it is preferable that the transport means from the granulated portion of the solid fuel to the solid fuel boiler is other than the vehicle from the viewpoint of transport cost and CO ₂ emission can be reduced.
However, the entire amount of solid fuel does not have to be transported to the solid fuel boiler via the transport section. For example, there is a transport port to the outside of the sludge fuel conversion device between the granulation section and the transport section or between the transport sections, and a part of the solid fuel is transferred from the transport port to the outside of the sludge fuel conversion device using a vehicle or the like. It is also preferable that the fuel can be transported to another facility or a business operator.
It is preferable that the sludge fuel conversion device has a wiring for supplying the electric power obtained from the generator to the transport unit, and the transport in the transport unit is performed by using the return electric power from the viewpoint of reducing CO ₂ emissions.

It is preferable that the transport section can seal between the granulation section and the solid fuel boiler. By charging the solid fuel into the solid fuel boiler in a closed state, it becomes easier to suppress the odor and dust when transporting the dry sludge.
The sealing means is not particularly limited, and examples thereof include a mode in which a tubular cover covering the transport portion is provided, and a mode in which the inside is negatively pressured to prevent the scattering of odors and soot and dust.

(RPF input section)
It is preferable that the transport unit 41 includes an RPF input unit and can mix the solid fuel 22 and the RPF 31 in a desired ratio.
It is also preferable that the transport unit 41 includes a coal input unit and can mix the solid fuel 22 and coal (not shown) in a desired ratio.
The viewpoint of adjusting the transport unit so that the solid fuel easily satisfies the condition 1A, condition 1B or condition 1C in the first preferred embodiment, or the condition 2A, condition 2B or condition 2C in the second or third preferred embodiment. Therefore, it is preferable to transport the RPF, coal, and solid fuel to the solid fuel boiler. In particular, it is more preferred that the transport section transports RPF containing at least one of plastic, paper and paper sludge, or coal, and solid fuel to a solid fuel boiler.

<Solid fuel boiler>
It is preferable that the transport unit is connected to the upper part of the solid fuel boiler. For example, the transport unit is preferably connected to a region within 30% of the height of the solid fuel boiler, more preferably within 20% from the top, and within 10% from the top. It is particularly preferable that it is connected to the area of.
The height of the solid fuel boiler is not particularly limited, and for example, the lower limit is preferably 10 m or more, more preferably 20 m or more, and particularly preferably 40 m or more. The upper limit is, for example, preferably 100 m or less, more preferably 80 m or less, and particularly preferably 60 m or less.

The solid fuel boiler is not particularly limited, and examples thereof include a biomass boiler and a fossil fuel boiler (particularly a coal boiler). The solid fuel boiler is preferably a biomass boiler.
The combustion method of the solid fuel boiler is not particularly limited, and examples thereof include a fluidized bed (fluidized bed) furnace, a stalker furnace, a melting furnace, and a rotary kiln. Among these, a fluidized bed furnace is preferable from the viewpoint of maintenance. The fluidized bed furnace is more preferably a circulating fluidized bed furnace from the viewpoint of temperature control in the furnace.
As the solid fuel boiler, a combination of two or more of these furnaces may be used. In that case, a fluidized bed furnace and a stoker furnace are preferably combined in this order.

(Additional fuel input section)
It is preferable that the solid fuel boiler 51 further includes an additional fuel input section 52.
The additional fuel 53 preferably comprises at least one of coal, plastic, paper, wood chips and rubber. The additional fuel 53 may contain fiber debris and the like.
A high amount of heat can be obtained by charging the solid fuel 22 containing dry sludge and the other additional fuel 53 into the solid fuel boiler 51.

(Piping to supply steam)
The sludge fuel conversion device preferably includes a pipe (not shown) for supplying (returning) the steam 55 obtained from the solid fuel boiler 51 to the sludge drying unit 11. With this configuration, it is possible to reduce the acquisition cost of energy input for drying in the sludge drying section, improve energy efficiency, and reduce CO ₂ emissions.
Further, it is preferable that the sludge fuel conversion device has a pipe (not shown) for supplying (returning) the steam 55 obtained from the solid fuel boiler 51 to the granulation unit 21. This configuration reduces the cost of obtaining energy for heating in the granulation section and enhances energy efficiency.
₂ Emissions can be reduced.
When the solid fuel boiler is equipped with a generator, these pipes are preferably arranged so that the steam that has passed through the generator can be used.

(Generator)
It is preferable that the solid fuel boiler 51 further includes a generator 56. The steam 55 generated in the solid fuel boiler 51 is preferably supplied to a turbine (not shown) of the generator 56 and used for power generation.
The sludge fuel conversion device 101 preferably supplies the electric power 57 obtained from the generator 56 to at least one of the sludge drying section 11, the granulating section 21 and the transport section 41, and the sludge drying section 11 and the granulating section 21. And it is more preferable to supply all of the transport units 41.
With this configuration, it is possible to reduce the acquisition cost of energy input for drying in the sludge drying section, the granulating section and the transport section, improve the energy efficiency, and reduce the CO ₂ emission amount.

<Other devices>
The sludge fueling device may include parts having other functions.
For example, a deodorizing part that treats odors, a dust collecting part that treats dust, a temperature reducing tower, a reaction tower, an ash pit, an exhaust part such as a chimney that can discharge exhaust to the outside, a heat exchange device, a silent device, a deodorant spraying device. It is usually preferable to provide such as.

As for the sludge fuel conversion device, it is preferable that all the facilities constituting the sludge fuel conversion device are in the same administrative area.
By integrating the sewage treatment plant, the drying business and the solid fuel boiler (equipment is also communicated, and the owner and the business operator are the same), the sewage treatment sludge can be used as solid fuel boiler fuel without becoming industrial waste. Can be used.

[Sludge fuel conversion system]
The sludge fuel conversion system of the present invention includes the sludge fuel conversion device of the present invention and a sewage treatment plant, and transports sludge obtained at the sewage treatment plant to a sludge drying section by a vehicle.
In FIG. 1, the sludge fuel conversion system 102 includes a sludge fuel conversion device 101 and a sewage treatment plant 1. For example, it is preferable to transport the sludge 3 obtained by the sludge dehydrator 2 of the sewage treatment plant 1 to the sludge drying section 11 by a vehicle.
As the sewage treatment plant, a normal sewage treatment plant can be used.
The sludge dehydrator is not particularly limited, and a known device can be used, and examples thereof include a conventionally known centrifuge and an indirect heating method or a vacuum heating type dryer. Further, examples of the dehydrator include a screw press, a belt press, a belt filter, and a centrifuge.

In the sludge fuel conversion system of the present invention, it is preferable that the sludge fuel conversion device and the sewage treatment plant are located in the same administrative area.
When a public organization has a sewage treatment plant, a business operator (for example, a factory such as a paper factory, a power plant, etc.) is asked to a public organization having a sewage treatment plant (for example, a local government such as a country, a prefecture or a municipality). It is preferable that the land of the solid fuel boiler portion is rented and the sludge fuel conversion device of the present invention is installed on the land (sludge drying portion, granulation portion, and transport portion are installed).
The sludge fuel conversion system of the present invention can efficiently recycle sludge as fuel by efficiently linking the sludge fuel conversion device and the sewage treatment plant. In addition, since it can be easily processed in a short time, the problem of odor generation due to putrefaction can be suppressed. Further, the heat generated by combustion in the solid fuel boiler can be used, for example, in other facilities that require heating.
Examples of other facilities that require such heating include factories (preferably paper mills), power plants, greenhouses for growing flowers, and the like.
Other facilities that require heating are preferably close to the sludge fueling equipment from the viewpoint of reducing the cost of using electricity and steam.

[Sludge fuel utilization type factory]
The sludge fuel utilization type factory of the present invention is equipped with the sludge fuel conversion device of the present invention or the sludge fuel conversion system of the present invention and a factory, and is provided with a pipe for supplying steam obtained from a solid fuel boiler to the factory. It is a paper factory.
In FIG. 1, the sludge fuel utilization type factory 103 includes a sludge fuel conversion system 102 (including a sludge fuel conversion device 101) and a factory 61. For example, it is preferable that the factory 61 is a paper mill, provided with a pipe (not shown) for supplying the steam 55 obtained from the solid fuel boiler 51 to the factory 61.
In the sludge fuel utilization type factory 103, it is preferable that the solid fuel boiler 51 further includes a generator 56 and supplies the electric power 57 obtained from the generator 56 to the factory 61.

By integrating the sewage treatment plant, sludge drying section, solid fuel boiler and factory (communication in terms of equipment), it is possible to contribute to the advanced utilization of thermal energy.

[Manufacturing method of solid fuel]
The method for producing solid fuel of the present invention includes a step of drying sludge to obtain dry sludge.
It includes a step of granulating dry sludge into solid fuel, and satisfies the following conditions (1), (2) or (3).
Condition (1): The solid fuel consists only of dry sludge, and the actual volume of the solid fuel per grain is 0.1 to 100 cm ³ .
Condition (2): The solid fuel consists of at least one of plastic, paper and paper sludge, or a mixture of coal and dry sludge, and the actual volume of the solid fuel per grain is 0.1 to 400 cm ³ . ..
Condition (3): The solid fuel consists of at least one of plastic, paper and paper sludge, or a mixture of coal, a plant-derived deodorant, and dry sludge, and the actual volume of the solid fuel per grain. Is 0.1 to 400 cm ³ .
The preferred embodiments of the conditions (1), (2) and (3) are the same as the first preferred embodiment, the second preferred embodiment and the third preferred embodiment of the present invention, respectively.

In the method for producing a solid fuel of the present invention, it is preferable to dry the sludge until the water content of the dried sludge is 5 to 40% by mass, more preferably 20 to 40% by mass, and 25 to 35% by mass. Is more preferable.

The solid fuel obtained by the method for producing a solid fuel of the present invention can be easily burned without continuously using a combustion improver such as heavy oil. Therefore, it can be a particularly preferable fuel from the viewpoint of CO ₂ emissions and carbon neutrality.

1 Sewage treatment plant 2 Sludge dehydrator 3 Sludge 11 Sludge drying part 12 Dry sludge 21 Granulation part 22 Solid fuel 31 RPF
32 RPF manufacturing raw material input unit 33 RPF manufacturing raw material 34 Deodorant 41 Transport unit 51 Solid fuel boiler 52 Additional fuel input unit 53 Additional fuel 55 Steam 56 Generator 57 Electricity 61 Factory 101 Sludge fuel conversion device 102 Sludge fuel conversion system 103 Sewage fuel utilization type factory

Claims (23)

The sludge drying section, granulation section, transport section and solid fuel boiler are integrated in this order.
The granulated portion molds at least the dried sludge obtained in the sludge drying portion into solid fuel.
A sludge fuel conversion device in which the transport unit transports at least the solid fuel to the solid fuel boiler. The sludge fuel conversion device according to claim 1, wherein the dry sludge has a water content of 5 to 40% by mass. The sludge fueling apparatus according to claim 1 or 2, wherein the transport unit transports RPF or coal containing at least one of plastic, paper and paper sludge, and the solid fuel to the solid fuel boiler. The granulated portion molds only the dry sludge into solid fuel,
The sludge fuel conversion device according to any one of claims 1 to ³ , wherein the actual volume per grain of the solid fuel is 0.1 to 100 cm ³ . When the total true calorific value of all fuels supplied to the solid fuel boiler is Q ¹ and the true calorific value of the solid fuel is Q ² , the solid fuel satisfies the following condition 1A, condition 1B or condition 1C. , The sludge fuel conversion device according to any one of claims 1 to 4.
Condition 1A: The water content of the solid fuel is 20% by mass or less, and the value of 100% × Q ² / Q ¹ is 40% or less.
Condition 1B: The water content of the solid fuel exceeds 20% by mass and is 30% by mass or less, and the value of 100% × Q ² / Q ¹ is 20% or less.
Condition 1C: The water content of the solid fuel is more than 30% by mass and 40% by mass or less, and the value of 100% × Q ² / Q ¹ is 10% or less. The sludge fuel conversion according to any one of claims 1 to 3, wherein the granulated portion molds at least one of plastic, paper and paper sludge, or a mixture of coal and the dry sludge into a solid fuel. apparatus. The sludge fuel conversion device according to claim 6, wherein the solid fuel contains coal in an amount of 15% by mass or less based on the total mass of the solid fuel. Any of claims 1 to 3, wherein the granulated portion molds at least one of plastic, paper and paper sludge, or a mixture of coal, a plant-derived deodorant, and the dry sludge into solid fuel. The sludge fuel conversion device described in item 1. The sludge fuel conversion apparatus according to claim 8, wherein the solid fuel contains the deodorant or coal in an amount of 15% by mass or less based on the total mass of the solid fuel. The sludge fuel conversion device according to any one of claims 6 to 9, wherein the actual volume per grain of the solid fuel is 0.1 to 400 cm ³ . The total net calorific value of the total fuel supplied to the solid fuel boiler and Q ^1, the net calorific value of the solid fuel in the case of the Q ^3, wherein the solid fuel satisfies the following condition 2A, Condition 2B or condition 2C , The sludge fuel conversion device according to any one of claims 6 to 10.
Condition 2A: The water content of the solid fuel is 20% by mass or less, and the value of 100% × Q ³ / Q ¹ is 60% or less.
Condition 2B: the water content of the solid fuel is not more than 30 wt% more than 20 wt%, the value of 100% × Q ³ / Q ¹ is less than 30%.
Condition 2C: the water content of the solid fuel is not more than 40 wt% more than 30 wt%, the value of 100% × Q ³ / Q ¹ is 15% or less. The sludge fuel conversion device according to any one of claims 1 to 11, wherein the transport unit can seal between the granulation unit and the solid fuel boiler. The sludge fuel conversion device according to any one of claims 1 to 12, wherein the solid fuel boiler is a biomass boiler. The solid fuel boiler further comprises an additional fuel input.
The sludge fueling apparatus according to any one of claims 1 to 13, wherein the additional fuel comprises at least one of coal, plastic, paper, wood chips and rubber. The sludge fuel conversion apparatus according to any one of claims 1 to 14, further comprising a pipe for supplying steam obtained from the solid fuel boiler to the sludge drying section. The solid fuel boiler is further equipped with a generator
The sludge fuel conversion device according to any one of claims 1 to 15, wherein the electric power obtained from the generator is supplied to at least one of the sludge drying section, the granulating section, and the transport section. The means for transporting the dry sludge is other than a vehicle,
The sludge fuel conversion device according to any one of claims 1 to 16, wherein the means for transporting the solid fuel from the granulated portion to the solid fuel boiler is other than a vehicle. The sludge fuel conversion device and the sewage treatment plant according to any one of claims 1 to 17 are provided.
A sludge fuel conversion system for transporting sludge obtained at the sewage treatment plant to the sludge drying section by a vehicle. The sludge fuel conversion system according to claim 18, wherein the sludge fuel conversion device and the sewage treatment plant are located in the same administrative area. The sludge fuel conversion device according to any one of claims 1 to 17, or the sludge fuel conversion system according to claim 18 or 19.
With a factory
A pipe for supplying steam obtained from the solid fuel boiler to the factory is provided.
A sludge fuel utilization type factory in which the factory is a paper mill. The solid fuel boiler is further equipped with a generator
The sludge fuel utilization type factory according to claim 20, wherein the electric power obtained from the generator is supplied to the factory. A method for producing solid fuel using a sludge fuel conversion device in which a sludge drying unit, a granulation unit, a transport unit, and a solid fuel boiler are integrated in this order.
The process of drying sludge into dry sludge,
A method for producing a solid fuel, which comprises a step of granulating the dry sludge into a solid fuel and satisfies the following conditions (1), (2) or (3).
Condition (1): The solid fuel consists only of the dry sludge.
The actual volume of the solid fuel per grain is 0.1 to 100 cm ³ .
Condition (2): The solid fuel comprises at least one of plastic, paper and paper sludge, or a mixture of coal and the dry sludge.
The actual volume of the solid fuel per grain is 0.1 to 400 cm ³ .
Condition (3): The solid fuel comprises at least one of plastic, paper and paper sludge, or a mixture of coal, a plant-derived deodorant, and the dry sludge.
The actual volume of the solid fuel per grain is 0.1 to 400 cm ³ . The method for producing a solid fuel according to claim 22, wherein the sludge is dried until the water content of the dried sludge reaches 5 to 40% by mass.

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