Equipment and method for preparing composite material of fuel and desulfurizer through cooperation of sludge and biomass

Abstract

The invention provides equipment and a method for preparing a fuel and desulfurizer composite material from sludge and biomass. The equipment comprises a sludge storage, transportation and charging unit, a biomass treatment and charging unit, a limestone treatment and charging unit, a stirrer, a dehydration device, a granulator and a product bin. According to the invention, sludge, biomass and limestone are used as raw materials, and according to the characteristics of the raw materials, through a certain ratio and a preparation process, the dual functions of sludge and biomass co-processing as a fuel and a desulfurizer are realized. The prepared composite material is high in calorific value, heat self-sustaining of boiler combustion can be achieved, and a large amount of primary energy is saved; meanwhile, in the combustion process, the composite material can form huge pores, a higher specific surface area is provided for desulfurization reaction, and compared with traditional limestone in-furnace desulfurization, the desulfurization efficiency can be integrally improved, and the effective utilization value of solid waste resources is maximized.

Description

Technical Field

[0001] The invention relates to the technical field of sludge treatment, and in particular to a device and a method for preparing a composite material of fuel and a desulfurizer by using sludge and biomass in combination. Background Art

[0002] In recent years, the production of sludge as a byproduct of sewage treatment has been increasing. Sludge contains pathogenic microorganisms, parasite eggs, heavy metals such as copper and zinc, organic matter and other difficult-to-degrade substances. However, the current domestic sludge disposal capacity is insufficient, the treatment methods are relatively backward, and it cannot be standardized and applied.

[0003] my country is a large agricultural and forestry country. Agricultural and forestry ecological wetlands produce a large amount of biomass, such as straw, rice straw, sawn wood, etc., which need to be processed. Energy conversion is one of the main directions of biomass because of its high calorific value. Direct incineration not only causes environmental pollution, but also causes a lot of energy waste.

[0004] A large amount of pollutants (such as sulfur oxides, nitrogen oxides, and dust, etc.) generated by combustion equipment in industrial plants pose a huge threat to the atmospheric environment and human health. For circulating fluidized bed boilers, the environmental protection requirements for pollutant emissions are usually met by spraying traditional limestone desulfurizers into the furnace. The calcium utilization rate of this traditional desulfurizer is relatively low, resulting in a large amount of calcium-based desulfurizer raw material waste. This is because the limestone desulfurizer sprayed in has a particle size equivalent to that of the circulating fluidized bed material, and most of the particles are larger than 200μm, resulting in only the surface of the desulfurizer particles being able to react with sulfur oxides to play a desulfurization role, while most of the internal particles do not react, resulting in a relatively low calcium utilization rate, which results in a large amount of calcium-based desulfurizer raw material waste. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiment of the present invention provides an apparatus and method for preparing a composite material of fuel and desulfurizer by using sludge and biomass, so that sludge and biomass can be effectively utilized and the utilization value can be maximized, and the problem of low utilization rate of desulfurization calcium in circulating fluidized bed boiler furnace can be solved.

[0006] In one aspect, an embodiment of the present invention proposes a device for preparing a composite material of fuel and desulfurizer by sludge and biomass, comprising: a mixer, a dehydration device and a granulator, the mixer having a sludge inlet, a biomass inlet, a limestone inlet and a discharge port, the sludge inlet of the mixer is connected to a sludge storage and feeding unit, the biomass inlet of the mixer is connected to a biomass processing and feeding unit, the limestone inlet of the mixer is connected to a limestone processing and feeding unit, and the discharge port of the mixer is located at the bottom of the mixer; the dehydration device has a feed port and a discharge port, and the feed port of the dehydration device is connected to the discharge port of the mixer; the granulator has a feed port and a discharge port, the feed port of the granulator is connected to the discharge port of the dehydration device, and the discharge port of the granulator is connected to a product bin.

[0007] In some embodiments, the sludge treatment and feeding unit includes a sludge storage bin, a sludge storage bin, a sludge feeding device and a sludge conveying device. The sludge conveying device conveys the sludge in the sludge storage bin to the sludge storage bin. The discharge port of the sludge storage bin is connected to the sludge feeding device to feed the sludge into the mixer.

[0008] In some embodiments, the biomass processing and feeding unit includes a biomass crushing device, a biomass storage bin, a biomass feeding device and a biomass conveying device. The biomass conveying device conveys the biomass crushed in the biomass crushing device to the biomass storage bin. The discharge port of the biomass storage bin is connected to the biomass feeding device to feed the biomass into the mixer.

[0009] In some embodiments, the limestone processing and feeding unit includes limestone crushing equipment, a limestone storage bin, a limestone feeding equipment and a limestone conveying equipment. The limestone conveying equipment conveys the limestone crushed in the limestone crushing equipment to the limestone storage bin. The discharge port of the limestone storage bin is connected to the limestone feeding equipment to feed the limestone into the mixer.

[0010] In some embodiments, the dehydration device comprises one or a combination of a centrifuge, a vacuum filter, a filter press, or a dryer.

[0011] On the other hand, an embodiment of the present invention proposes a method for preparing a composite material of fuel and desulfurizer by sludge and biomass, using the above-mentioned equipment, including the following steps: crushing the biomass to a particle size less than or equal to 2 mm, crushing the limestone to a particle size less than 75 μm, and conveying the sludge with a certain moisture content and the crushed biomass and limestone in a certain proportion to a mixer, and fully stirring and mixing to obtain a primary product; when the moisture content of the primary product is greater than or equal to 35%, conveying the primary product to a dehydrator for dehydration to keep the overall moisture content of the material at 25% to 35%, and conveying the dehydrated material to a granulator for extrusion granulation to obtain a composite material that can be used as a fuel and a desulfurizer; when the moisture content of the primary product is less than 35%, directly conveying the dehydrated material to a granulator for extrusion granulation to obtain a composite material that can be used as a fuel and a desulfurizer.

[0012] In some embodiments, the biomass is one or more of sawdust, wood shavings, sawn wood, wood residue, fruit shells, husks, rice husks, rice straw and corn cobs, the mass of the biomass in the mixer is 10% to 110% of the mass of the sludge, and the mass of the limestone is 20% to 110% of the mass of the sludge.

[0013] In some embodiments, the stirring time of the stirrer is 0.5 to 2 hours.

[0014] In some embodiments, the mold used in the granulator is a cylindrical structure with a diameter of 2 to 10 mm and a length of 3 to 50 mm.

[0015] In some embodiments, the moisture content of the prepared composite material is 1-20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0017] in:

[0018] Figure 1 This is a schematic diagram of the structure of a device for preparing a composite material of fuel and desulfurizer by using sludge and biomass in an embodiment of the present invention;

[0019] Reference numerals:

[0020] 1. Sludge storage silo; 2. Sludge conveying equipment; 3. Sludge storage silo; 4. Sludge feeding equipment; 5. Limestone conveying equipment; 6. Limestone storage silo; 7. Limestone feeding equipment; 8. Biomass crushing equipment; 9. Biomass conveying equipment; 10. Biomass storage silo; 11. Biomass feeding equipment; 12. Mixer; 13. Dehydration equipment; 14. Granulator; 15. Product silo; 16. Limestone crushing equipment. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0022] The following describes the equipment and method for preparing a composite material of fuel and desulfurizer by combining sludge with biomass according to an embodiment of the present invention with reference to the accompanying drawings.

[0023] like Figure 1 As shown, an embodiment of the present invention proposes an equipment for preparing a composite material of fuel and desulfurizer by sludge and biomass, including: a mixer 12, a dehydration device 13 and a granulator 14, the mixer 12 has a sludge inlet, a biomass inlet, a limestone inlet and a discharge port, the sludge inlet of the mixer 12 is connected to the sludge storage and feeding unit, the biomass inlet of the mixer 12 is connected to the biomass processing and feeding unit, the limestone inlet of the mixer 12 is connected to the limestone processing and feeding unit, and the discharge port of the mixer 12 is located at the bottom of the mixer 12; the dehydration device 13 has a feed port and a discharge port, and the feed port of the dehydration device 13 is connected to the discharge port of the mixer 12; the granulator 14 has a feed port and a discharge port, the feed port of the granulator 14 is connected to the discharge port of the dehydration device 13, and the discharge port of the granulator 14 is connected to the product bin 15.

[0024] The embodiment of the present invention arranges a sludge storage and feeding unit, a biomass treatment and feeding unit, a limestone treatment and feeding unit, a mixer 12, a dehydration device 13 and a granulator 14, mixes the sludge, biomass and limestone in proportion, and then dehydrates and granulates them to obtain a composite material of fuel and desulfurizer, which can realize the resource utilization, large-scale, harmless and thorough sludge treatment; it can also realize the efficient resource utilization of biomass, which can be used as fuel; at the same time, it can be used as a desulfurizer to meet the demand for efficient desulfurization of circulating fluidized bed boilers, and realize the truly efficient utilization of sludge and biomass.

[0025] In some embodiments, the sludge treatment and feeding unit includes a sludge storage bin 1, a sludge storage bin 3, a sludge feeding device 4 and a sludge conveying device 2. The sludge conveying device 2 conveys the sludge in the sludge storage bin to the sludge storage bin 3. The discharge port of the sludge storage bin 3 is connected to the sludge feeding device 4 to feed the sludge into the mixer 12.

[0026] The sludge storage bin 3 is used to receive and store the sludge from the sludge storage bin 1. The sludge feeding device 4 is equipped with a weighing device and a conveying device to add the sludge into the mixer 12 according to the set feeding amount. The sludge conveying device 2 is used to convey the sludge to the sludge feeding device 4. The sludge conveying device 2 is a sludge conveying pump, which can be a screw pump or a plunger pump.

[0027] In some embodiments, the biomass processing and feeding unit includes a biomass crushing device 8, a biomass storage bin 10, a biomass feeding device 11 and a biomass conveying device 9. The biomass conveying device 9 conveys the biomass crushed in the biomass crushing device 8 to the biomass storage bin 10. The discharge port of the biomass storage bin 10 is connected to the biomass feeding device 11 to feed the biomass into the mixer 12.

[0028] The biomass crushing device 8 is used to crush the biomass used so that its particle size is less than 2 mm. The biomass storage bin 10 is used to receive and store the biomass that reaches the required particle size after crushing. The biomass feeding device 11 is used to add the crushed biomass into the mixer 12. The biomass feeding device 11 is equipped with a weighing device and a conveying device to add the biomass into the mixer 12 according to the set feeding amount. The biomass conveying device 9 is used to convey the biomass to the biomass feeding device 11. The biomass conveying device 9 can be a conventional solid material conveying device or semi-solid material conveying device in the art, such as an elevator, a belt conveyor or a motor vehicle conveyor.

[0029] In some embodiments, the limestone processing and feeding unit includes a limestone crushing device 16, a limestone storage bin 6, a limestone feeding device 7 and a limestone conveying device 5. The limestone conveying device 5 conveys the crushed limestone in the limestone crushing device 16 to the limestone storage bin 6. The discharge port of the limestone storage bin 6 is connected to the limestone feeding device 7 to feed the limestone into the mixer 12.

[0030] The limestone crushing device 16 is used to crush the limestone to a particle size of less than 75 μm. The limestone storage bin 6 is used to receive and store the limestone that has reached the required particle size after crushing. The limestone feeding device 7 is used to add the crushed limestone to the mixer 12. The limestone feeding device 7 is equipped with a weighing device and a conveying device to add the limestone to the mixer 12 according to the set feeding amount. The limestone conveying device 5 is used to convey the limestone to the limestone feeding device 7. The limestone conveying device 5 can be a conventional solid material conveying device or semi-solid material conveying device in the art, such as an elevator, a belt conveying device or a motor vehicle conveying device.

[0031] In some embodiments, the dehydration device 13 includes one or a combination of a centrifuge, a vacuum filter, a filter press, or a dryer.

[0032] On the other hand, an embodiment of the present invention proposes a method for preparing a composite material of fuel and desulfurizer by sludge and biomass, using the above-mentioned equipment, including the following steps: crushing the biomass to a particle size less than or equal to 2 mm, crushing the limestone to a particle size less than 75 μm, and conveying the sludge with a certain moisture content and the crushed biomass and limestone in a certain proportion to a mixer 12, and fully stirring and mixing to obtain a primary product; when the moisture content of the primary product is greater than or equal to 35%, conveying the primary product to a dehydrator for dehydration to keep the overall moisture content of the material at 25% to 35%, and conveying the dehydrated material to a granulator 14 for extrusion granulation to obtain a composite material that can be used as a fuel and a desulfurizer; when the moisture content of the primary product is less than 35%, directly conveying the dehydrated material to a granulator 14 for extrusion granulation to obtain a composite material that can be used as a fuel and a desulfurizer.

[0033] The composite material prepared by the method of the embodiment of the present invention can be used as fuel to effectively utilize the organic matter and calorific value in the sludge. After adding biomass for synergistic treatment, its dry basis calorific value can reach 3000-5000 kcal / kg, which is close to the calorific value of low-rank coal. It can provide self-sustaining calorific value combustion when entering the furnace without the need to supplement other energy sources.

[0034] The composite material prepared by the method of the embodiment of the present invention is used as a desulfurizer. The limestone is prepared into particles with a smaller particle size (less than 75 μm), and the particles are adhered to the surface of sludge and biomass and then enter the furnace. The organic matter in the sludge and biomass will form huge pores after combustion. The huge pores provide a larger contact area between the flue gas SO2 and the limestone. The remaining inorganic skeleton carries the calcined calcium oxide component, which will increase the specific surface area of ​​the desulfurizer reaction without changing the overall particle size of the circulating fluidized bed, thereby improving the desulfurization efficiency.

[0035] During use, the composite material prepared by the method of the embodiment of the present invention can directly remove the chlorine element as a precursor of dioxin by CaO or CaCO3, thereby reducing the corrosion of the chlorine component to the boiler and significantly reducing the total amount of dioxin emissions during sludge incineration.

[0036] Through the preparation method of the embodiment of the present invention, a composite material that can be used as a fuel and a desulfurizer can be prepared, which can not only achieve efficient and thorough disposal of sludge, but also achieve efficient resource utilization of biomass. At the same time, compared with traditional limestone furnace desulfurization, the composite material of the embodiment of the present invention can be used as a desulfurizer and improve the desulfurization efficiency, which is a very effective and economical method.

[0037] The preparation method of the embodiment of the present invention can realize harmless and thorough utilization of sludge, solve the problem of high moisture content of sludge, and enter the furnace as fuel for combustion, thereby realizing thorough treatment.

[0038] The preparation method of the embodiment of the present invention can maximize the use of existing industrial equipment, has a simple process, is environmentally friendly, and has low investment and operation and maintenance costs.

[0039] By crushing the limestone to a particle size of less than 75 μm, it is more conducive for the limestone as an active component to adhere to the surface of the sludge in the form of particles, thereby better exerting the role of the limestone and improving the calcium utilization rate.

[0040] Furthermore, in the embodiment of the present invention, sludge is used as the heat source and carrier of the composite material. As a byproduct of sewage treatment, sludge contains about 30-60% by weight of organic matter, which can provide the heat required for combustion. In addition, it has a certain viscosity. At the same time, sludge particles have the characteristics of large specific surface area and high porosity, and can be used as a carrier of active ingredients. The inorganic skeleton remaining after the organic matter in the sludge is burned carries the calcined calcium oxide component, which will increase the specific surface area of ​​the composite material and sulfur dioxide reaction without changing the overall particle size of the circulating fluidized bed, thereby improving the desulfurization efficiency.

[0041] Preferably, the sludge used in the embodiment of the present invention contains oxides that can promote the desulfurization reaction, such as CaO, Fe2O3, Al2O3, etc., so as to improve the desulfurization efficiency of the composite material.

[0042] Preferably, the sludge used in the embodiments of the present invention has a moisture content of >75% by weight, and more preferably a moisture content of 80-90% by weight.

[0043] Furthermore, the limestone is selected to have a calcium carbonate content of more than 90%, preferably more than 95%. The higher the calcium content of the limestone, the more complete the reaction with sulfur oxides is, and the better the desulfurization effect is.

[0044] Furthermore, the biomass is crushed to a particle size less than 1 mm.

[0045] In some embodiments, the biomass is one or more of wood chips, wood shavings, sawn wood, wood residue, fruit shells, husks, rice husks, rice straw and corn cobs, the mass of the biomass in the mixer 12 is 10% to 110% of the mass of the sludge, and the mass of the limestone is 20% to 110% of the mass of the sludge, that is, the mass ratio of sludge, biomass and limestone is 1: (0.1 to 1.1): (0.2 to 1.1).

[0046] Preferably, the mass of the limestone is 30% to 70% of the mass of the sludge, more preferably 35% to 50%.

[0047] Preferably, the mass of the biomass is 50% to 110% of the mass of the sludge.

[0048] In some embodiments, the stirring time of the stirrer 12 is 0.5 to 2 hours.

[0049] In some embodiments, the mold used by the granulator 14 is a cylindrical structure with a diameter of 2 to 10 mm and a length of 3 to 50 mm. The prepared composite material is a cylindrical particle with a diameter of 2 to 10 mm and a length of 3 to 50 mm.

[0050] Preferably, the diameter is 3 to 7 mm and the length is 5 to 10 mm.

[0051] In some embodiments, the water content of the prepared composite material is 1-20% (weight percentage), preferably 5-15%, and more preferably 5-10%.

[0052] It should be noted that during the granulation process, the composite material is compressed into granules by pressure or other physical methods. This process will further reduce the moisture content in the composite material from 25% to 35% to 1 to 20%.

[0053] The embodiment of the present invention also discloses a method for using a composite material of fuel and desulfurizer, comprising the following steps: transporting the composite material to the furnace of a circulating fluidized bed boiler to burn it and react it with sulfur-containing components.

[0054] Preferably, the composite material is transported to the furnace of the circulating fluidized bed boiler via the desulfurizer feeding port of the circulating fluidized bed boiler or the secondary air port of the furnace of the circulating fluidized bed boiler; or the composite material is transported to the furnace of the circulating fluidized bed boiler by mixing the composite material into the coal (for example, mixing it into the coal in the coal yard, mixing it into the coal on the coal conveyor belt, etc.).

[0055] The present invention is further described below through specific examples.

[0056] Example 1

[0057] The composite material of fuel and desulfurizer is prepared according to the following method:

[0058] (1) Sludge raw material with a moisture content of 80%, sawn wood and corn with a particle size of less than 1 mm after crushing, and limestone with a particle size of less than 75 μm after crushing and a calcium carbonate content of more than 90% are transported to a mixer 12 in a ratio of 1:0.8:0.5;

[0059] (2) stirring in the mixer 12 for 2 hours, at which time the water content after stirring is about 35%;

[0060] (3) The material is then sent from the mixer 12 to the dehydration device 13, and the overall moisture of the composite material is maintained at 25% after dehydration. The dehydrated material is sent to the granulator 14 for extrusion granulation, and the prepared material is cylindrical particles with a diameter of 6 mm and a length of about 15 mm. The granulated material is placed in the product bin 15 to obtain a composite material that can be used as a fuel and a desulfurizer.

[0061] It has been determined that the dry basis high calorific value of the prepared composite material reaches 4100 kcal / kg, and can be used as a good fuel.

[0062] Industrial Applicability: The composite material of the embodiment of the present invention can be widely used in industrial combustion equipment (such as circulating fluidized bed boiler) to provide fuel and desulfurization agent.

[0063] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A device for preparing a composite material of fuel and desulfurizer by using sludge and biomass, characterized in that: include: A mixer, the mixer having a sludge inlet, a biomass inlet, a limestone inlet and a discharge port, the sludge inlet of the mixer being connected to a sludge storage and feeding unit, the biomass inlet of the mixer being connected to a biomass processing and feeding unit, the limestone inlet of the mixer being connected to a limestone processing and feeding unit, and the discharge port of the mixer being located at the bottom of the mixer; A dehydration device, wherein the dehydration device has a feed inlet and a discharge outlet, and the feed inlet of the dehydration device is connected to the discharge outlet of the mixer; The granulator has a feed port and a discharge port, the feed port of the granulator is connected to the discharge port of the dehydration device, and the discharge port of the granulator is connected to the product bin.

2. The equipment for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 1, characterized in that: The sludge processing and feeding unit includes a sludge storage bin, a sludge storage bin, a sludge feeding device and a sludge conveying device. The sludge conveying device conveys the sludge in the sludge storage bin to the sludge storage bin. The discharge port of the sludge storage bin is connected to the sludge feeding device to feed the sludge into the mixer.

3. The equipment for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 1, characterized in that: The biomass processing and feeding unit includes a biomass crushing device, a biomass storage bin, a biomass feeding device and a biomass conveying device. The biomass conveying device conveys the biomass crushed in the biomass crushing device to the biomass storage bin. The discharge port of the biomass storage bin is connected to the biomass feeding device to feed the biomass into the mixer.

4. The equipment for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 1, characterized in that: The limestone processing and feeding unit includes limestone crushing equipment, limestone storage bin, limestone feeding equipment and limestone conveying equipment. The limestone conveying equipment conveys the limestone crushed in the limestone crushing equipment to the limestone storage bin. The discharge port of the limestone storage bin is connected to the limestone feeding equipment to feed the limestone into the mixer.

5. The equipment for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 1, characterized in that: The dehydration device comprises one or a combination of a centrifuge, a vacuum filter, a filter press or a drying machine.

6. A method for preparing a composite material of fuel and desulfurizer by using sludge and biomass, characterized in that: Using the device according to any one of claims 1 to 5, comprising the following steps: The biomass is crushed to a particle size of less than or equal to 2 mm, the limestone is crushed to a particle size of less than 75 μm, the sludge with a certain moisture content and the crushed biomass and limestone are installed in a certain proportion and transported to a mixer, and are fully stirred and mixed to obtain a primary product; When the moisture content of the initial product is greater than or equal to 35%, the initial product is sent to a dehydrator for dehydration to keep the overall moisture content of the material at 25% to 35%, and the dehydrated material is sent to a granulator for extrusion granulation to obtain a composite material that can be used as a fuel and a desulfurizer; when the moisture content of the initial product is less than 35%, the dehydrated material is directly sent to a granulator for extrusion granulation to obtain a composite material that can be used as a fuel and a desulfurizer.

7. The method for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 6, characterized in that: The biomass is one or more of sawdust, wood shavings, sawn wood, wood residue, fruit shells, husks, rice husks, rice straw and corn cobs. The mass of the biomass in the mixer is 10% to 110% of the mass of the sludge, and the mass of the limestone is 20% to 110% of the mass of the sludge.

8. The method for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 6, characterized in that: The stirring time of the stirrer is 0.5 to 2 hours.

9. The method for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 6, characterized in that: The mold used in the granulator is a cylindrical structure with a diameter of 2 to 10 mm and a length of 3 to 50 mm.

10. The method for preparing a composite material of fuel and desulfurizer by using sludge and biomass according to claim 6, characterized in that: The water content of the prepared composite material is 1-20%.

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