Device for reducing moisture of biomass fuel by using waste heat

Abstract

The application discloses a device for reducing water content of biomass fuel by using waste heat, which comprises a slag outlet pipe, the upper end of the slag outlet pipe is connected with a boiler slag outlet pipe, the lower end of the slag outlet pipe is located above the feeding end of a scraper conveyor, the discharging end of the scraper conveyor is located above the feeding end of a belt conveyor, a roller dryer is arranged on the upper side of the scraper conveyor in parallel, the roller dryer is provided with a feeding port and a discharging port, the feeding port is located below the discharging end of a biomass fuel input belt, and the discharging port is located above the feeding end of a biomass fuel output belt; the device can dry the biomass fuel, the dried biomass fuel can provide calorific value immediately after entering a boiler for combustion, and the device has good efficiency; in addition, the dried biomass fuel will not ferment after being stored; the device dries the biomass fuel by using the heat of boiler waste slag, and no other energy consumption is needed, so that energy saving and environmental protection are achieved.

Description

Technical Field

[0001] This invention relates to thermoelectric systems, and more particularly to a device for reducing external water content in biomass fuels using waste heat. Background Technology

[0002] Currently, coal is the primary fuel for boilers in thermal power systems. However, coal not only has high procurement costs, but also emits a large amount of pollutants during combustion, resulting in significant environmental pressure. In contrast, biomass fuel is both economical and environmentally friendly, with costs far lower than coal and near-neutral carbon emissions after combustion. If it can partially or completely replace coal, it can significantly reduce operating costs and contribute to green transformation.

[0003] However, biomass fuels have inherent drawbacks: their high moisture content means that during direct combustion, a large amount of heat is used to dry the moisture, failing to effectively convert it into usable calorific value and significantly reducing energy efficiency. Furthermore, the high moisture content makes them prone to fermentation and spoilage during storage, which not only results in a loss of calorific value but may also pose safety hazards. Therefore, pre-drying biomass fuels is a necessary prerequisite.

[0004] However, using the heat generated by coal-fired boilers to dry biomass fuel would fall into the paradox of "using high-cost energy to process low-cost fuel." This would not only fail to fully leverage the cost advantage of biomass fuel, but would also keep the overall energy cost high, deviating from the original intention of cost reduction and environmental protection. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a device for reducing external water content in biomass fuel by utilizing waste heat, so as to solve the technical problems raised in the background art.

[0006] The objective of this invention is achieved through the following technical solution: A device for reducing external water content in biomass fuel using waste heat includes a slag discharge pipe. The upper end of the slag discharge pipe is connected to a boiler slag discharge pipe, and the lower end is located above the feed end of a scraper conveyor. The discharge end of the scraper conveyor is located above the feed end of a belt conveyor. A drum dryer is installed parallel to the upper side of the scraper conveyor. The drum dryer has a feed inlet and a discharge outlet. The feed inlet is located below the discharge end of the biomass fuel input belt, and the discharge outlet is located above the feed end of the biomass fuel output belt.

[0007] Furthermore, the rotary drum dryer is a reversible rotary drum dryer, with the feed inlet and discharge outlet at the same end, located at the discharge end of the scraper conveyor.

[0008] Furthermore, the scraper conveyor is mounted on a frame, which includes multiple support frames. Each support frame includes two columns and a support beam connected between the two columns. The scraper conveyor is located within the space formed by the two columns and the support beam of the multiple support frames.

[0009] Furthermore, the top surfaces of the two columns of the partial support frame are respectively provided with roller assemblies. The roller assembly includes a U-shaped frame, and rollers are rotatably installed inside the U-shaped frame. The roller assembly on the partial support frame supports the drum dryer, and the rollers are in rolling contact with the drum dryer.

[0010] Furthermore, two additional support columns are provided outside the two columns on one side of the two adjacent support frames. The two columns on one side of the two adjacent support frames and the two support columns support the platform, and the drive mechanism of the drum dryer is set on the platform.

[0011] The beneficial effects of this invention are: The device proposed in this invention utilizes waste heat to reduce external moisture in biomass fuel. A portion of the waste slag discharged from the boiler slag discharge pipe is introduced into the feed end of a scraper conveyor via a slag discharge pipe. The scraper conveyor transports the waste slag from its feed end to its discharge end, where it falls under its own weight into the feed end of a belt conveyor and is carried away. Simultaneously, the scraper conveyor transfers the heat from the waste slag (which has a temperature of 800-850℃) to a rotary drum dryer. Biomass fuel output from the discharge end of the biomass fuel input belt enters the rotary drum dryer through the feed inlet. Inside the dryer, the biomass fuel is fully lifted and dispersed as the drum rotates, simultaneously absorbing heat to evaporate moisture. The dried biomass fuel is discharged from the feed inlet of the dryer and falls into the biomass fuel output belt, where it is carried away. The dried biomass fuel provides immediate calorific value upon combustion in the boiler, exhibiting high efficiency. Furthermore, the dried biomass fuel does not ferment during storage. This device utilizes the heat from boiler waste slag to dry biomass fuel, requiring no other energy consumption, thus saving energy and protecting the environment.

[0012] The rotary drum dryer is a reversible rotary drum dryer. The feed inlet and discharge outlet of the reversible rotary drum dryer are at the same end and located at the discharge end of the scraper conveyor, which allows the biomass fuel input belt and biomass fuel output belt to be belts.

[0013] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein: Figure 1 This is a three-dimensional structural diagram of the present invention.

[0015] Figure 2 This is a three-dimensional structural schematic diagram of the present invention from another perspective.

[0016] In the diagram: 1. Slag discharge pipe; 2. Scraper conveyor; 3. Feed end; 4. Discharge end; 5. Belt conveyor; 6. Rotary drum dryer; 7. Feed port; 8. Discharge port; 9. Support frame; 10. Roller assembly; 11. Platform. Detailed Implementation

[0017] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0018] like Figure 1-2 The device shown utilizes waste heat to reduce external water content in biomass fuel. It includes an inclined slag discharge pipe 1, whose upper end is connected to the boiler slag discharge pipe and whose lower end is located above the feed end 3 of the scraper conveyor 2. The slag discharge pipe 1 is made of the same material as the boiler slag discharge pipe. Waste slag discharged from the boiler slag discharge pipe enters the slag discharge pipe 1 by its own weight. The waste slag in the slag discharge pipe 1 enters the feed end 3 of the scraper conveyor 2 by its own weight. The discharge end 4 of the scraper conveyor 2 is located above the feed end of the belt conveyor 5. A drum dryer is installed parallel to the upper side of the scraper conveyor 2. Machine 6, the rotary drum dryer 6 is a reversible rotary drum dryer, which is an existing type of dryer. The reversible rotary drum dryer is equipped with a feed inlet 7 and a discharge outlet 8. The feed inlet 7 and the discharge outlet 8 of the reversible rotary drum dryer are at the same end and located at the discharge end 4 of the scraper conveyor 2. The feed inlet 7 of the reversible rotary drum dryer is located below the discharge end of the biomass fuel input belt, and the discharge outlet 8 is located above the feed end of the biomass fuel output belt. The biomass fuel input belt and the biomass fuel output belt are belt conveyors.

[0019] The scraper conveyor 2 is mounted on a frame, which includes multiple support frames 9. Each support frame 9 includes two columns and a support beam connecting the two columns. The scraper conveyor 2 is located within the space formed by the two columns and the support beam of the multiple support frames 9. Roller assemblies 10 are respectively provided on the top surface of the two columns of some support frames 9. Each roller assembly 10 includes a U-shaped frame, within which rollers are rotatably mounted via bearings. The roller assemblies 10 on some support frames 9 support the drum of the rotary drum dryer 6, and the rollers make rolling contact with the drum of the rotary drum dryer 6.

[0020] Two additional support columns are provided outside the two columns on one side of the two adjacent support frames 9. The two columns on one side of the two adjacent support frames and the two support columns support the platform 11. The drive mechanism of the drum dryer 6 is set on the platform 11.

[0021] The device for reducing external water content in biomass fuel using waste heat proposed in this invention involves a slag discharge pipe 1 that introduces a portion of the waste slag discharged from the boiler slag discharge pipe into the feed end 3 of a scraper conveyor 2. The scraper conveyor 2 transports the waste slag from its feed end to the discharge end 4, where it falls by its own weight into the feed end of a belt conveyor 5 and is carried away. Simultaneously, the scraper conveyor 2 transfers the heat from the waste slag (which has a temperature of 800-850℃) to a rotary drum dryer 6. Biomass fuel output from the discharge end of the biomass fuel input belt enters the rotary drum dryer 6 through the feed inlet 7. The biomass fuel is fully lifted and dispersed within the rotary drum dryer 6 as the drum rotates, simultaneously absorbing heat to evaporate moisture. The dried biomass fuel is discharged from the feed inlet 8 of the rotary drum dryer 6 and falls into the biomass fuel output belt, where it is carried away. The dried biomass fuel enters the boiler for combustion, providing immediate calorific value with high efficiency. Furthermore, the dried biomass fuel will not ferment during storage. This device utilizes the heat from boiler waste slag to dry biomass fuel, requiring no other energy consumption, making it energy-saving and environmentally friendly.

[0022] When the rotary drum dryer rotates forward, the biomass fuel moves inward; when it rotates in reverse, the biomass fuel moves outward, allowing the biomass fuel to enter and exit from the same end of the drum dryer.

[0023] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments without departing from the technical solution of the present invention and based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A device for reducing external water content in biomass fuel using waste heat, characterized in that, It includes a slag discharge pipe (1), the upper end of which is connected to the boiler slag discharge pipe and the lower end is located above the feed end (3) of the scraper conveyor (2). The discharge end (4) of the scraper conveyor (2) is located above the feed end of the belt conveyor (5). A drum dryer (6) is provided parallel to the upper side of the scraper conveyor (2). The drum dryer (6) is provided with a feed inlet (7) and a discharge outlet (8). The feed inlet (7) is located below the discharge end of the biomass fuel input belt, and the discharge outlet (8) is located above the feed end of the biomass fuel output belt.

2. The device for reducing external water content in biomass fuel using waste heat according to claim 1, characterized in that, The rotary drum dryer (6) is a rotary drum dryer with forward and reverse rotation. The feed inlet (7) and discharge outlet (8) of the rotary drum dryer are at the same end and located at the discharge end (4) of the scraper conveyor (2).

3. The device for reducing external water content in biomass fuel using waste heat according to claim 1 or 2, characterized in that, The scraper conveyor (2) is mounted on a frame, which includes multiple support frames (9). Each support frame (9) includes two columns and a support beam connected between the two columns. The scraper conveyor (2) is located in the space formed by the two columns and the support beam of the multiple support frames (9).

4. The device for reducing external water content in biomass fuel using waste heat according to claim 3, characterized in that, The top surfaces of the two columns of the partial support frame (9) are respectively provided with roller assemblies (10). The roller assembly (10) includes a U-shaped frame, and the roller is rotatably provided inside the U-shaped frame. The roller assembly on the partial support frame (9) supports the drum of the drum dryer (6), and the roller is in rolling contact with the drum of the drum dryer (6).

5. The device for reducing external water content in biomass fuel using waste heat according to claim 4, characterized in that, Two additional support columns are provided outside the two columns on one side of the two adjacent support frames (9). The two columns on one side of the two adjacent support frames (9) and the two support columns support the platform (11). The drive mechanism of the drum dryer (6) is set on the platform (11).

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