System for preparing mixed briquette fuel by coupling sludge drying and carbonization with biomass

Abstract

The invention discloses a system for preparing mixed briquette fuel by coupling sludge drying and carbonization with biomass. The system comprises a sludge conveying device, a sludge drying and carbonization device, a biomass gasification furnace, a combustion furnace, a high-precision metering scale, a double-shaft stirrer, a forming machine, a cyclone dust collector, a spray tower, a condenser, an activated carbon adsorption device, an induced draft fan and a chimney. Sludge is conveyed to the drying and carbonizing device through the spiral conveying machine, direct contact type heat exchange is conducted on the sludge through high-temperature smoke provided by the biomass gasified gas combustion furnace, and drying and carbonizing treatment of the sludge is achieved. Waste gas generated in the carbonization process of the sludge is treated by a cyclone dust collector, a spray tower, a condenser, an activated carbon adsorption device and the like in sequence and then is discharged to a chimney by an induced draft fan to reach the standard to be discharged. The method realizes harmless, reduction and resourceful treatment of the sludge, and the prepared mixed briquette fuel has good combustion efficiency and environmental friendliness.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste treatment and energy recovery, and relates to a system for coupling sludge drying and carbonization with biomass to prepare a mixed molded fuel. Background Art

[0002] With the improvement of urban sewage treatment capacity, the output of sludge shows a rapid growth trend. Sludge is rich in organic matter, heavy metals, pathogenic microorganisms and various toxic and harmful components. If not effectively treated and disposed of, it is extremely easy to cause secondary pollution to the soil, water body and atmospheric environment. Traditional sludge treatment methods such as sanitary landfill, incineration, composting, etc. have gradually exposed problems such as low treatment efficiency, large resource waste and high environmental risks, and it is difficult to meet the increasingly strict environmental protection requirements. Among various sludge resource utilization paths, the treatment method combining drying and pyrolytic carbonization has received extensive attention in recent years due to its dual advantages of reduction and energy conversion. During the drying and carbonization of sludge, water is effectively removed, and organic matter pyrolyzes under anaerobic conditions to generate combustible gas, tar and solid carbonaceous residue (i.e., sludge carbon). Compared with the original sludge, the volume of sludge carbon is greatly reduced, and it has a large specific surface area and porous structure, which is beneficial to subsequent energy conversion and utilization.

[0003] Biomass such as straw and wood chips usually contains high volatile substances and carbon content, and has a high calorific value, and can be well energy-coupled with sludge carbon. The volume of sludge carbon is greatly reduced during pyrolysis compared with the original sludge, and due to its porous structure and large specific surface area, it can improve the combustion efficiency of the fuel. When sludge carbon is combined with biomass, it can not only improve the combustion efficiency, but also reduce the risk of secondary pollution during the sludge disposal process. The complementarity of biomass makes its co-utilization with sludge carbon have good energy conversion potential. Through appropriate heat source recovery and product mixing technologies, it is possible to reduce the operating cost while improving the energy efficiency of the overall system, meet the environmental protection standards and improve the economic benefits of sludge treatment.

[0004] In actual industrial applications, there are still many technical difficulties in how to co-utilize sludge carbonization and biomass energy to build a continuous, efficient and environmentally friendly integrated system. For example, how to efficiently couple heat source recovery, product mixing and fuel preparation is the key link to realize sludge resource utilization. Summary of the Invention

[0005] Aiming at the problems existing in the prior art, the system and method for coupling sludge drying and carbonization with biomass to prepare a mixed molded fuel provided by the present invention overcome the defects of low energy efficiency, weak pollution control ability and low resource utilization rate existing in the existing sludge treatment technology, and realize the high-efficiency harmless treatment and high-value resource utilization of sludge.

[0006] The present invention is realized through the following technical solutions: A system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, comprising: A sludge treatment unit, including a sludge conveying device and a sludge drying and carbonization device connected in sequence; A biomass energy conversion unit, including a biomass gasifier and a combustion furnace. The gasification gas outlet of the biomass gasifier is connected to the inlet of the combustion furnace, and the high-temperature flue gas outlet pipeline of the combustion furnace is communicated with the inlet of the sludge drying and carbonization device; The mixed molded fuel preparation unit includes a twin-shaft mixer and a molding machine. The carbon outlet of the sludge drying and carbonization device is connected to the twin-shaft mixer and the molding machine in sequence; A gas purification and treatment device, including a cyclone dust collector, a spray tower, a condenser, an activated carbon adsorption device, a draft fan and a chimney connected in sequence; the inlet of the cyclone dust collector is connected to the waste gas outlet of the sludge drying and carbonization device; Preferably, the sludge conveying device adopts a screw conveyor.

[0007] Preferably, the sludge drying and carbonization device adopts a rotary pyrolysis carbonization furnace, and a deflector for moving the material forward is arranged inside.

[0008] Preferably, a first weighing scale is arranged on the pipeline between the carbon outlet of the sludge drying and carbonization device and the twin-shaft mixer; Preferably, a second weighing scale is arranged on the pipeline between the twin-shaft mixer and the biomass raw material conveying pipeline.

[0009] Preferably, the sludge drying and carbonization device realizes pyrolysis carbonization by direct contact of high-temperature flue gas with sludge to produce sludge carbon. After the biomass raw material is mixed with the sludge carbon at a mass fraction of 10wt%-40wt%, it is prepared into block-shaped, spherical or cylindrical granular fuel by a molding machine.

[0010] Preferably, the dimensions of the block-shaped fuel prepared by the molding machine are length×width×height of 30×30×mm; the diameter of the spherical fuel prepared is 30-70 mm; the diameter of the cylindrical granular fuel prepared is 6-30mm, and the length is 10-30 mm.

[0011] Preferably, the temperature of the high-temperature flue gas generated by the combustion furnace is controlled at 600~900℃.

[0012] Preferably, the spray tower is equipped with a device for adding sodium hydroxide solution to neutralize the acidic gas in the waste gas.

[0013] A method for preparing a sludge drying and carbonization coupled biomass mixed molded fuel by using the above system, comprising the following steps: S1. Sludge conveying: Convey the sludge to the sludge drying and carbonization device through the sludge conveying device; S2. Sludge drying and carbonization: In the sludge drying and carbonization device, high-temperature flue gas from the combustion furnace is used for direct contact heat exchange with the sludge, enabling the sludge to complete the drying and carbonization processes simultaneously to obtain sludge carbon. S3. Exhaust gas treatment: The exhaust gas generated during the sludge drying and carbonization process enters the gas purification and treatment device in sequence. Particulates are removed by a cyclone dust collector, acidic gases are neutralized in a spray tower, water vapor is condensed by a condenser, and odors are removed by an activated carbon adsorption device. Finally, it is discharged into the chimney through an induced draft fan to meet the emission standards. S4. Mixing and batching: The sludge carbon produced in step S2 and the biomass raw materials are separately or jointly transported to a twin-shaft mixer for mixing. S5. Molding: The uniformly mixed material is fed into a molding machine and pressed into a mixed molded fuel.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: 1) Through the collaborative utilization of the sludge drying and carbonization device and biomass, the present invention realizes the efficient drying and carbonization of sludge, effectively reduces the moisture content and volume of sludge, and achieves the purpose of sludge reduction. At the same time, during the carbonization process of sludge, harmful substances such as organic matter and pathogens are effectively removed, realizing the harmless treatment of sludge.

[0015] 2) In the prepared mixed molded fuel, the sludge carbon is mixed in a proportion of 10 - 40%, giving full play to the advantages of each raw material. Through experimental verification, the mixed molded fuel has good combustion efficiency. Compared with traditional fuels, it burns more fully, can effectively improve the energy utilization efficiency; at the same time, the pollutant emissions during the combustion process of the mixed molded fuel are relatively low, showing good environmental friendliness.

[0016] 3) The present invention realizes the resource utilization of sludge, converts sludge into a mixed molded fuel with combustion value, reduces the cost of sludge treatment, and at the same time generates certain energy benefits. In addition, the system and method reduce the negative environmental impacts of traditional sludge treatment methods such as landfill and incineration, have significant environmental benefits, and meet the requirements of sustainable development.

[0017] 4) The system for preparing mixed molded fuel by coupling sludge drying and carbonization with biomass provided by the present invention has low operating costs, good sludge treatment effects, strong technical feasibility, and all indicators can meet national standards, having important practical value and broad promotion prospects. Description of the Drawings

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a schematic diagram of a system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass in the present invention; In the figure: biomass gasifier 1, combustion furnace 2, sludge conveying device 3, sludge drying and carbonization device 4, first weighing scale 5, twin-shaft mixer 6, molding machine 7, cyclone dust collector 8, spray tower 9, condenser 10, activated carbon adsorption device 11, induced draft fan 12, chimney 13, second weighing scale 14. Specific embodiments

[0020] The technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0021] Embodiment 1: The present invention provides a system and method for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass. As Figure 1 shown, according to the system structure of the present invention, a system for coupling sludge carbonization with biomass to prepare a mixed molded fuel is built. Among them, the system includes a sludge conveying device 3, a sludge drying and carbonization device 4, a biomass gasifier 1, a combustion furnace 2, a first weighing scale 5, a twin-shaft mixer 6, a molding machine 7, a cyclone dust collector 8, a spray tower 9, a condenser 10, an activated carbon adsorption device 11, an induced draft fan 12, a chimney 13 and a second weighing scale 14.

[0022] The cyclone dust collector 8 and the spray tower 9 in the gas purification treatment device are both selected as equipment meeting industry standards; The sludge drying and carbonization device adopts a rotary pyrolysis furnace, and a guide plate is welded on the inner wall of the furnace. The guide plate has an inclination angle of 10° - 30°; when the rotary furnace rotates, the guide plate can make the material move forward for transportation, and the biomass burner uses a high-efficiency biomass burner to generate high-temperature flue gas; The mixed molded fuel preparation unit is equipped with a high-precision weighing scale, a twin-shaft mixer and a pellet molding machine.

[0023] The municipal sludge with a moisture content of 80% is conveyed to the sludge drying and carbonization device through a screw conveyor.

[0024] Biomass is gasified in a gasifier and burned in a combustion furnace to produce high-temperature flue gas at 600 - 900 °C. The high-temperature flue gas enters the sludge drying and carbonization device and conducts direct contact heat exchange with the sludge. After treatment, the moisture content of the sludge drops to about 8 - 40%, completing the drying and carbonization process and forming sludge carbon.

[0025] The waste gas generated during the sludge drying and carbonization process enters a cyclone dust collector in sequence to remove larger-sized particulate matter in the waste gas; The waste gas enters a cyclone dust collector in sequence to remove larger-sized particulate matter in the waste gas; then the waste gas enters a spray tower, and a sodium hydroxide solution is added to the spray tower to neutralize the acidic gas in the waste gas, and then it enters a condenser to condense the water vapor in the waste. Finally, the waste gas passes through an activated carbon adsorption device to remove the odor in the waste gas. After detection, all indicators of the waste gas meet the local emission standards and are then discharged into the atmosphere.

[0026] The prepared sludge carbon and biomass are weighed separately by a high-precision weighing scale according to the proportion that the mass fraction of sludge carbon is 10 - 40% and then transported to a twin-shaft mixer for stirring and mixing.

[0027] The mixed formed fuel is added to a forming machine for molding. According to the actual situation, mixed formed fuels of different sizes are prepared. The dimensions of the block fuel prepared by the forming machine are length × width × height = 30 × 30 × (20 - 100) mm; the diameter of the spherical fuel prepared by the forming machine is 30 - 70 mm; the diameter of the cylindrical fuel prepared by the forming machine is 6 - 30 mm and the length is 10 - 30 mm. After detection, the combustion characteristics of this mixed formed fuel are superior to those of single sludge carbon fuel combustion.

[0028] Example 2 The first weighing scale 5 and the second weighing scale 14 use high-precision weighing scales, and the weighing accuracy reaches ±0.5%; the twin-shaft mixer 6 is equipped with twin-screw agitators, and the adjustable speed range of the agitators is 30 - 60 rpm; The forming machine 7 is equipped with replaceable molds to facilitate the forming of fuels of different specifications and shapes, and can prepare fuels of the following specifications: Block fuel: a cuboid with dimensions of length × width × height = 30 × 30 × 20 - 100 mm; Spherical fuel: a sphere with a diameter of 30 - 70 mm; Cylindrical granular fuel: a cylinder with a diameter of 6 - 30 mm and a length of 10 - 30 mm.

[0029] The activated carbon adsorption device 11 is filled with honeycomb activated carbon; The sludge drying and carbonization device 4 uses a pyrolysis carbonization furnace with direct contact heat exchange between sludge and flue gas. The inner wall of the carbonization furnace is provided with a material guide plate, which can ensure that the sludge is in full contact with the high-temperature flue gas during the forward movement process for heat exchange.

[0030] The gasified gas generated by gasifying biomass in the gasifier 1 enters the combustion furnace 2 to burn and generate high-temperature flue gas, and the temperature of the high-temperature flue gas is controlled at 600-900 °C.

[0031] The mixed molding fuel preparation unit is equipped with high-precision metering equipment and mixing equipment, which can accurately control the ratio of raw materials and the mixing uniformity.

[0032] The gas purification treatment device includes a cyclone dust collector 8, a spray tower 9, a condenser 10 and an activated carbon adsorption device 11 connected in sequence. The waste gas enters the cyclone dust collector 8 in turn to remove the larger-particle-size particulate matter in the waste gas. Then the waste gas enters the spray tower 9, and sodium hydroxide solution is added to the spray tower 9 to neutralize the acidic gas in the waste gas, and then enters the condenser 10 to condense the water vapor in the waste gas. Finally, the waste gas passes through the activated carbon adsorption device 11 to remove the odor in the waste gas, and finally the flue gas is discharged into the chimney 13 by the induced draft fan 12. After detection, the indicators of the waste gas all meet the local emission standards and are discharged into the atmosphere.

[0033] The sludge conveying device 3 uses a screw conveyor to continuously and stably convey the dewatered sludge to the drying and carbonization device, ensuring the tightness and fluidity of the feeding process.

[0034] The biomass gasifier 1 uses biomass particles or blocks as fuel. After generating gasified gas through the gasifier, it enters the combustion furnace to generate high-temperature flue gas as the heat source for sludge drying and carbonization.

[0035] In the mixed molding fuel preparation unit, after the sludge carbon is produced, it is cooled and collected, and mixed with biomass in a proportion of 10-40% of the sludge carbon mass ratio, and a mixed molding fuel is prepared through processes such as stirring or granulation for subsequent combustion utilization or sales.

[0036] Realize the organic combination of sludge treatment, energy conversion and waste gas purification, and reduce the system energy consumption and operation cost; The sludge carbon has a high porosity and a large specific surface area, and has good adsorption and combustion-supporting effects; preferably, through the co-forming of sludge carbon and biomass, the comprehensive calorific value and utilization rate of the sludge carbon fuel are improved, the dependence on high-grade fuels is reduced, and the resource utilization path of "treating waste with waste" is realized; The combustion furnace 2 adopts a multi-stage combustion chamber design, which can fully burn the combustible gas generated by biomass gasification and improve the heat exchange efficiency.

[0037] The double-shaft mixer 6 adopts a variable-frequency adjustment design, which can adjust the mixing rate according to different raw material characteristics and ratios.

[0038] Example 3: The working process of a system method for sludge drying and carbonization coupled with biomass to prepare a mixed molding fuel provided by the present invention is as follows: 1) Continuously convey the sludge to the carbonization furnace of the sludge drying and carbonization device 4 through the sludge conveying device 3. The residence time of the sludge in the furnace is 2 - 3 hours, and the temperature is controlled at 400 - 500 °C, so as to realize the drying and preliminary carbonization of the sludge and obtain sludge carbon.

[0039] 2) Weigh the prepared sludge carbon and biomass accurately by a high-precision weighing scale according to the mass fraction of sludge carbon being 10 - 40%, and then enter the twin-shaft mixer 6 for mixing. The mixing rate is 20 - 30 rpm. 3) The mixed material enters the molding machine 7 and is pressed into fuel in the required form. The molding pressure is controlled at 12 - 15 MPa, and the molding temperature is 80 - 100 °C. 4) The molded fuel enters the cyclone dust collector 8 for preliminary classification. The particulate matter with a particle size greater than 2 mm is sent back to the molding machine 7 for re-pressing, and the particulate matter with a particle size less than 2 mm enters the spray tower 9. 5) In the spray tower 9, spray sodium hydroxide solution (concentration 30%) into the waste gas, make it contact fully with the waste gas, and neutralize the acidic gas. The neutralized waste gas enters the condenser 10, and the cooling temperature is controlled at 40 - 50 °C to condense the water vapor. 6) The condensed waste gas enters the activated carbon adsorption device 11, and the pollutants such as VOC, H2S, NH3 in the waste gas are removed by the adsorption of activated carbon, and at the same time, a small amount of pollutants such as dioxins that are difficult to degrade are adsorbed. 7) The waste gas at the outlet of the activated carbon adsorption device 11 is discharged into the chimney 13 through the induced draft fan 12, and the heat generated by incineration is recovered and utilized through the jacket for heating or other purposes. The whole system operates stably and reliably, with a sludge treatment capacity of 10 - 20 t / d, and the treatment efficiency can reach over 95%.

[0040] It should be noted that the terms "first", "second", etc. in the description, claims and above-mentioned drawings of the present invention are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or equipment that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or equipment.

[0041] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. When a component is referred to as "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component at the same time. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component at the same time.

[0042] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] As mentioned above, it is only the preferred embodiment of the present invention and does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the illustrations in the specification and the above description; however, any equivalent changes such as slight modifications, decorations, and evolutions made by those familiar with the technology within the scope of the technical solution of the present invention using the technical content disclosed above are equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications, and evolutions made to the above embodiments based on the essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, characterized in that, including, a sludge treatment unit, including a sludge conveying device (3) and a sludge drying and carbonization device (4) connected in sequence; a biomass energy conversion unit, including a biomass gasifier (1) and a combustion furnace (2), the gasification gas outlet of the biomass gasifier (1) is connected to the inlet of the combustion furnace (2), and the high-temperature flue gas outlet pipe of the combustion furnace (2) is communicated with the inlet of the sludge drying and carbonization device (4); the mixed molding fuel preparation unit includes a double-shaft mixer (6) and a molding machine (7), and the carbon outlet of the sludge drying and carbonization device (4) is connected to the double-shaft mixer (6) and the molding machine (7) in sequence; a gas purification treatment device, including a cyclone dust collector (8), a spray tower (9), a condenser (10), an activated carbon adsorption device (11), a draft fan (12) and a chimney (13) connected in sequence; the inlet of the cyclone dust collector (8) is connected to the waste gas outlet of the sludge drying and carbonization device (4).

2. The system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass according to claim 1, wherein The sludge conveying device (3) adopts a screw conveyor.

3. A system and method for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, according to claim 1, characterized in that The sludge drying and carbonization device (4) adopts a rotary pyrolysis carbonization furnace, and a deflector for moving the material forward is arranged inside.

4. A system and method for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, as claimed in claim 1, wherein A first weighing scale (5) is arranged on the pipeline between the carbon outlet of the sludge drying and carbonization device (4) and the double-shaft mixer (6).

5. A system and method for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, characterized in that, A second weighing scale (14) is arranged on the pipeline between the double-shaft mixer (6) and the biomass raw material conveying pipeline.

6. A system and method for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, characterized in that, The sludge drying and carbonization device (4) realizes pyrolysis carbonization by direct contact between high-temperature flue gas and sludge to produce sludge carbon. After the biomass raw material is mixed with the sludge carbon at a mass fraction of 10wt%-40 wt %, it is prepared into block-shaped, spherical or cylindrical granular fuels by the molding machine (7).

7. A system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass according to claim 5, characterized in that, The length×width×height dimensions of the block-shaped fuel prepared by the molding machine (7) are 30×30×(20~100) mm; the diameter of the spherical fuel prepared is 30-70 mm; the diameter of the cylindrical granular fuel prepared is 6-30 mm, and the length is 10-30 mm.

8. A system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass, as claimed in claim 1, wherein The temperature of the high-temperature flue gas generated by the combustion furnace (2) is controlled at 600~900°C.

9. A system for preparing a mixed molded fuel by coupling sludge drying and carbonization with biomass according to claim 1, characterized in that, The spray tower (9) is equipped with a device for adding sodium hydroxide solution to neutralize acidic gases in the waste gas.

10. A method for preparing a sludge drying and carbonization coupled biomass mixed molding fuel by using the system according to any one of claims 1-9, characterized in that, including the following steps: S1. Sludge conveying: Convey the sludge to the sludge drying and carbonization device (4) through the sludge conveying device (3); S2. Sludge drying and carbonization: In the sludge drying and carbonization device (4), use the high-temperature flue gas from the combustion furnace (2) to conduct direct contact heat exchange with the sludge, so that the sludge simultaneously completes the drying and carbonization processes to obtain sludge carbon; S3. Waste gas treatment: The waste gas generated during the sludge drying and carbonization process enters the gas purification treatment device in sequence, the particulate matter is removed by the cyclone dust collector (8), the acidic gas is neutralized by the spray tower (9), the water vapor is condensed by the condenser (10), the odor is removed by the activated carbon adsorption device (11), and finally it is discharged up to standard into the chimney (13) through the draft fan (12); S4. Mixing and batching: Convey the sludge carbon generated in step S2 and the biomass raw material separately or jointly to the double-shaft mixer (6) for mixing; S5, Molding: Feed the uniformly mixed materials into a molding machine (7) to press and mold them into mixed molded fuels.

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