System for preparing refuse derived fuel from sludge and biomass

Abstract

The system for preparing the refuse derived fuel from the sludge and the biomass comprises a sludge drying crusher, a biomass crusher and a stirring mixer, the sludge drying crusher is connected with the stirring mixer, the biomass crusher is connected with the stirring mixer, and the stirring mixer is connected with the sludge drying crusher. Sludge can be dried and crushed into powder through the sludge drying and crushing machine, the water content of the sludge is reduced to 20% or below, then the sludge is fully mixed with crushed biomass fragments in the stirring and mixing machine, and the problem that the biomass fragments and the sludge are not uniformly mixed due to the fact that the water content in the sludge is too high is solved; the system for preparing the refuse derived fuel by using the sludge and the biomass, provided by the utility model, is low in production cost, can effectively reduce the water content in the sludge, and can avoid the problem of non-uniform proportioning and mixing of biomass fragments and dewatered sludge.

Description

Technical Field

[0001] This utility model belongs to the field of energy utilization. Specifically, this utility model relates to a system for preparing waste-derived fuel using sludge and biomass. Background Technology

[0002] Sludge is a byproduct of wastewater treatment, characterized by high water content, high organic matter content, and low specific gravity; it is a colloidal substance between liquid and solid. Due to its high organic matter content, sludge possesses a certain calorific value (8-10 MJ / kg on a dry basis) and is rich in nutrients such as nitrogen, phosphorus, and potassium. Resource utilization of sludge and achieving its reduction, stabilization, and harmless disposal are of great significance. Common biomass materials include straw, wood, sawdust, and agricultural and forestry waste such as corn cobs and rice husks. These materials are processed through crushing, mixing, and briquetting to produce biomass alternative fuels, which are used in cement kilns and coal-fired power plants to provide the necessary heat for replacing fossil fuel combustion. The preparation of alternative fuels using sludge and biomass mainly takes advantage of the fact that sludge has a low calorific value and cannot be directly burned. It is mixed with combustibles to prepare waste-derived fuel to replace fossil fuel combustion. This can make full use of the calorific value of sludge and effectively reduce the cost of sludge treatment. It is an effective way to harmlessly and resourcefully utilize sludge. However, it is usually difficult to achieve a moisture content of less than 55% after sludge dewatering. The waste-derived fuel pellets after extrusion granulation still need to be dried by hot air dryer and cold air dryer. The production and processing cost of the whole system is high. Moreover, if the moisture content of sludge after dewatering does not meet the requirements, the mixing ratio of straw powder and dewatered sludge will be uneven, resulting in unstable properties such as calorific value of fuel pellets. In actual production applications, there are many inconveniences and instabilities.

[0003] To address the aforementioned problems, patent document 206385112U discloses a system for preparing waste-derived fuel through sludge dewatering and drying. This system includes a sludge dewatering machine, an electronic screw scale, and a mixing belt conveyor. Its key feature is the inclusion of a straw electronic belt scale connected to the mixing belt conveyor. The mixing belt conveyor is sequentially connected to a mixer, an extrusion granulator, a hot air dryer, and a cold air dryer. The hot air inlet of the hot air dryer is connected to a hot air furnace, and the air outlet of the hot air dryer is connected to the air inlet of a water-washing dust removal tower via a fan. The air outlet of the cold air dryer is connected to a cold air fan. Both the hot air dryer and the cold air dryer have closed-loop discharge impellers installed in their feed hoppers. This invention enables efficient utilization of sludge, improves resource utilization, and yields high-calorific-value waste-derived fuel. Utility Model Content

[0004] This utility model is designed to solve the aforementioned problems. Its purpose is to provide a low-cost system for preparing waste-derived fuel from sludge and biomass that effectively reduces the water content of sludge and avoids uneven mixing of biomass fragments and dewatered sludge. To achieve this objective, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a system for preparing waste-derived fuel using sludge and biomass, characterized by including a sludge drying and pulverizing machine, a biomass crusher, and a mixing machine, wherein the sludge drying and pulverizing machine is connected to the mixing machine, and the biomass crusher is connected to the mixing machine.

[0006] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also have the following feature: the water content of the sludge at the outlet of the sludge drying and pulverizing mill is less than 20%.

[0007] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also have the following features: it further includes a feeding assembly, which includes a first conveyor belt and a second conveyor belt. The two ends of the first conveyor belt are respectively connected to a sludge drying and pulverizing machine and a mixing machine, and the two ends of the second conveyor belt are respectively connected to a biomass crusher and a mixing machine.

[0008] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also have the following feature: the feeding assembly further includes a screw feeder, which is located at the bottom of the mixing machine, and the discharge port of the mixing machine is located above the screw feeder.

[0009] The system for preparing waste-derived fuel from sludge and biomass provided by this invention may also include a pelletizer connected to a mixing machine.

[0010] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also have the following feature: the feeding assembly includes a third conveyor belt, the two ends of which are respectively connected to the discharge port of the screw feeder and the pelletizer.

[0011] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also include a sludge feeder connected to a sludge drying and pulverizing machine.

[0012] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also have the following feature: the feeding assembly further includes a fourth conveyor belt, the two ends of which are respectively connected to a sludge feeder and a sludge drying and pulverizing machine.

[0013] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also have the following feature: it further includes a buffer chamber assembly, which includes a first buffer chamber and a second buffer chamber. The first buffer chamber is located at the bottom of the sludge drying and pulverizing machine, and the second buffer chamber is located at the bottom of the biomass crusher.

[0014] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model may also include an electronic screw scale, which is respectively installed in the first buffer chamber and the second buffer chamber.

[0015] The technical effect of this utility model is as follows: The system for preparing waste-derived fuel from sludge and biomass provided by this utility model includes a sludge drying and pulverizing machine, a biomass crusher, and a mixing machine. The sludge drying and pulverizing machine is connected to the mixing machine, and the biomass crusher is connected to the mixing machine. The sludge drying and pulverizing machine can dry and pulverize the sludge into powder, reducing the water content of the sludge to below 20%. Then, it is fully mixed with the crushed biomass fragments in the mixing machine, avoiding the problem of uneven mixing of biomass fragments and sludge caused by excessive water content in the sludge.

[0016] Therefore, the system for preparing waste-derived fuel from sludge and biomass provided by this utility model has low production cost, can effectively reduce the water content in sludge, and can avoid the problem of uneven mixing of biomass fragments and dewatered sludge. Attached Figure Description

[0017] This manual includes the following figures, which illustrate the following:

[0018] Figure 1 This is a schematic diagram of the system for preparing waste-derived fuel using sludge and biomass in an embodiment of this utility model.

[0019] The components in the diagram are labeled as follows: 10-Sludge drying and pulverizing machine, 20-Biomass crusher, 30-Mixing mixer, 40-Feeding assembly, 41-First conveyor belt, 42-Second conveyor belt, 43-Screw feeder, 44-Third conveyor belt, 45-Fourth conveyor belt, 50-Pelletizer, 60-Sludge feeder, 70-Buffer silo assembly, 71-First buffer silo, 72-Second buffer silo, 80-Electronic screw scale. Detailed Implementation

[0020] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0021] Figure 1This is a schematic diagram of the system for preparing waste-derived fuel using sludge and biomass in an embodiment of this utility model.

[0022] like Figure 1 As shown, the system for preparing waste-derived fuel from sludge and biomass provided by this utility model includes a sludge drying and pulverizing machine 10, a biomass crusher 20, and a mixing machine 30. The sludge drying and pulverizing machine 10 is connected to the mixing machine 30, and the biomass crusher 20 is connected to the mixing machine 30. The sludge drying and pulverizing machine 10 can dry and pulverize the sludge into powder, reducing the moisture content of the sludge to below 20%. The sludge is then fully mixed with the crushed biomass fragments in the mixing machine 30, avoiding the problem of uneven mixing between biomass fragments and sludge caused by excessive moisture content in the sludge. This can improve the calorific value of the sludge, enabling resource utilization of the sludge. The process is simple, the production cost is low, and no external additives are required. It achieves resource utilization of sludge without causing environmental pollution, which is in line with the current development trend of sludge treatment and disposal.

[0023] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model also includes a feeding assembly 40, which includes a first conveyor belt 41 and a second conveyor belt 42. The two ends of the first conveyor belt 41 are respectively connected to the discharge port of the sludge drying and pulverizing machine 10 and the inlet of the mixing machine 30. The first conveyor belt 41 can transport the dried and pulverized sludge into the mixing machine 30. The two ends of the second conveyor belt 42 are respectively connected to the discharge port of the biomass crusher 20 and the inlet of the mixing machine 30. The second conveyor belt 42 can transport the crushed biomass fragments into the mixing machine 30. The dried and pulverized sludge and the crushed biomass fragments are fully mixed in the mixing machine 30.

[0024] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model also includes a pelletizer 50, which is connected to a mixer 30. The feeding assembly 40 includes a screw feeder 43 and a third conveyor belt 44. The screw feeder 43 is located at the bottom of the mixer 30, and the discharge port of the mixer 30 is located above the screw feeder 43. The two ends of the third conveyor belt 44 are respectively connected to the discharge port of the screw feeder 43 and the feed port of the pelletizer 50. The screw feeder 43 can transport the mixture in the mixer 30 to the third conveyor belt 44, and then transport it to the pelletizer 50. In the pelletizer 50, the biomass fragments and sludge are squeezed and naturally heated, which improves the flexibility of the biomass. The bound water and active organic matter such as tar inside are squeezed out as natural binders to compress the biomass fragments and sludge powder into shape, which meets the needs of coal-fired enterprises such as cement kilns and power plants.

[0025] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model also includes a sludge feeder 60, which is connected to a sludge drying and pulverizing machine 10. The feeding assembly 40 also includes a fourth conveyor belt 45, the two ends of which are connected to the discharge port of the sludge feeder 60 and the inlet of the sludge drying and pulverizing machine 10, respectively. The fourth conveyor belt 45 can transport the sludge into the sludge drying and pulverizing machine 10 for drying and pulverizing. Before feeding the sludge, the sludge feeder 60 can naturally air-dry and sun-dry the sludge, thereby further reducing the moisture content of the sludge.

[0026] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model also includes a buffer chamber assembly 70 and an electronic screw scale 80. The buffer chamber assembly 70 includes a first buffer chamber 71 and a second buffer chamber 72. The first buffer chamber 71 is located at the bottom of the sludge drying and pulverizing machine 10, below the discharge port of the sludge drying and pulverizing machine 10. The first buffer chamber 71 can buffer the dried and pulverized sludge. The second buffer chamber 72 is located at the bottom of the biomass crusher 20, below the discharge port of the biomass crusher 20. The second buffer chamber 72 can buffer the crushed biomass fragments. Two electronic screw scales 80 are respectively installed in the first buffer chamber 71 and the second buffer chamber 72. The discharge ports of the electronic screw scales 80 are respectively connected to the first conveyor belt 41 and the second conveyor belt 42. The electronic screw scales 80 can quantitatively transport the sludge in the first buffer chamber 71 and the biomass fragments in the second buffer chamber 72 to the mixing machine 30, thereby determining the ratio of sludge and biomass fragments and further ensuring that the sludge and biomass fragments are mixed evenly.

[0027] When the system for preparing waste-derived fuel from sludge and biomass provided by this invention is in operation, the following steps are included:

[0028] Step S1: The sludge is fed into the sludge drying and pulverizing machine 10 by the sludge feeder 60 for drying and pulverizing to obtain sludge powder. The sludge powder falls into the first buffer chamber 71 for buffering, and the moisture content of the sludge powder is less than 20%.

[0029] Step S2: Biomass such as straw, wood, sawdust, corn cob, and rice husk are fed into the biomass crusher 20 to obtain biomass fragments, which fall into the second buffer chamber 72 for buffering.

[0030] In step S3, the electronic screw scale 80 is started, and the sludge powder and biomass fragments are transported according to the ratio. The sludge powder and biomass fragments are transported to the mixing machine 30 through the first conveyor belt 41 and the second conveyor belt 42.

[0031] In step S4, after thorough mixing, the screw feeder 43 conveys the mixture in the mixer 30 to the third conveyor belt 44, and then conveys it to the granulator 50 via the third conveyor belt 44.

[0032] In step S5, the pelletizer 50 extrudes and granulates the mixture and heats the material to achieve modulation, thereby obtaining waste-derived fuel pellets with a diameter of less than 8mm.

[0033] The role and effect of the embodiments

[0034] The system for preparing waste-derived fuel from sludge and biomass provided by this utility model includes a sludge drying and pulverizing machine 10, a biomass crusher 20, and a mixing machine 30. The sludge drying and pulverizing machine 10 is connected to the mixing machine 30, and the biomass crusher 20 is connected to the mixing machine 30. The sludge drying and pulverizing machine 10 can dry and pulverize the sludge into powder, reducing the moisture content of the sludge to below 20%. The sludge is then fully mixed with the crushed biomass fragments in the mixing machine 30, avoiding the problem of uneven mixing of biomass fragments and sludge due to excessive moisture content in the sludge. The system for preparing waste-derived fuel from sludge and biomass provided by this utility model has low production cost, can effectively reduce the moisture content of the sludge, and can avoid the problem of uneven mixing of biomass fragments and dewatered sludge.

[0035] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A system for preparing waste-derived fuel using sludge and biomass, characterized in that: The invention comprises a sludge drying and pulverizing machine (10), a biomass crusher (20) and a stirring and mixing machine (30), wherein the sludge drying and pulverizing machine (10) is connected to the stirring and mixing machine (30), and the biomass crusher (20) is connected to the stirring and mixing machine (30).

2. The system for preparing refuse-derived fuel using sludge and biomass according to claim 1, characterized in that: The water content of the sludge at the outlet of the sludge drying and pulverizing machine (10) is less than 20%.

3. The system for preparing refuse-derived fuel using sludge and biomass according to claim 2, characterized in that: The invention also comprises a feeding assembly (40), wherein the feeding assembly (40) comprises a first conveyor belt (41) and a second conveyor belt (42), wherein two ends of the first conveyor belt (41) are respectively connected to the sludge drying and crushing machine (10) and the stirring and mixing machine (30), and two ends of the second conveyor belt (42) are respectively connected to the biomass crusher (20) and the stirring and mixing machine (30).

4. The system for preparing refuse-derived fuel using sludge and biomass according to claim 3, characterized in that: The feeding assembly (40) further comprises a screw feeder (43), wherein the screw feeder (43) is arranged at the bottom of the stirring mixer (30), and the discharge port of the stirring mixer (30) is located above the screw feeder (43).

5. The system for preparing refuse-derived fuel using sludge and biomass according to claim 4, characterized in that: It also includes a granulator (50), which is connected to the stirring mixer (30).

6. The system for preparing refuse-derived fuel using sludge and biomass according to claim 5, characterized in that: The feeding assembly (40) comprises a third conveyor belt (44), and two ends of the third conveyor belt (44) are respectively connected to the discharge port of the screw feeder (43) and the granulator (50).

7. The system for preparing refuse-derived fuel using sludge and biomass according to claim 6, characterized in that: It also includes a sludge loader (60), which is connected to the sludge drying and pulverizing machine (10).

8. The system for preparing refuse-derived fuel using sludge and biomass according to claim 7, characterized in that: The feeding assembly (40) further comprises a fourth conveyor belt (45), and two ends of the fourth conveyor belt (45) are respectively connected to the sludge feeder (60) and the sludge drying and pulverizing machine (10).

9. The system for preparing refuse-derived fuel using sludge and biomass according to claim 8, characterized in that: It also includes a buffer bin assembly (70), the buffer bin assembly (70) including a first buffer bin (71) and a second buffer bin (72), the first buffer bin (71) being arranged at the bottom of the sludge drying and pulverizing machine (10), and the second buffer bin (72) being arranged at the bottom of the biomass crusher (20).

10. The system for preparing refuse-derived fuel using sludge and biomass according to claim 9, characterized in that: It also includes an electronic spiral scale (80), which is respectively arranged in the first buffer bin (71) and the second buffer bin (72).

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