A biomass pellet burner

Abstract

This utility model discloses a biomass pellet burner, comprising a combustion furnace, a feeding pipe, and a feeder. The discharge port of the feeder is connected to the upper feed port at one end of the feeding pipe, and the other end of the feeding pipe is connected to the combustion furnace. An air inlet is provided at one end of the feeding pipe, and one end of a first air branch pipe is connected to the air inlet of the feeding pipe. One end of a high-temperature furnace gas pipe is connected to the furnace wall above the ash outlet of the combustion furnace, and the other end of the high-temperature furnace gas pipe is connected to the air inlet of the feeding pipe. A first air pump is installed on the high-temperature furnace gas pipe. This utility model is not prone to clogging, and the high-temperature air during the feeding process dries the biomass pellets, ensuring the combustion efficiency of the biomass pellets and avoiding the generation of toxic gases due to incomplete combustion.

Description

Technical Field

[0001] This utility model relates to a burner, and more particularly to a biomass pellet burner, belonging to the field of burner technology. Background Technology

[0002] Biomass pellets are a renewable energy source made from agricultural and forestry waste through cold-forming and densification. They are characterized by high combustion efficiency and zero sulfur and phosphorus emissions, and their raw materials include straw and forestry residues. Existing biomass pellet burners primarily use screw extrusion feeding, which offers advantages such as reduced clogging and controllable feeding speed. However, due to the characteristics of the raw materials, biomass pellets are prone to absorbing moisture. Directly feeding damp biomass pellets into the burner can lead to incomplete combustion due to the high moisture content, reducing combustion efficiency and potentially producing toxic gases. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a biomass pellet burner that solves the problem of incomplete combustion of biomass pellets after they become damp.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A biomass pellet burner includes a combustion furnace, a feeding pipe, and a feeder. The discharge port of the feeder is connected to the upper feed port at one end of the feeding pipe, and the other end of the feeding pipe is connected to the combustion furnace. An air inlet is provided at one end of the feeding pipe. One end of a first air branch pipe is connected to the air inlet of the feeding pipe. One end of a high-temperature furnace gas pipe is connected to the furnace wall above the ash outlet of the combustion furnace, and the other end of the high-temperature furnace gas pipe is connected to the air inlet of the feeding pipe. A first air pump is provided on the high-temperature furnace gas pipe.

[0005] Furthermore, the combustion furnace includes a bottom combustion section, an upper drying and gasification section, and a flue gas section. A grate is provided in the bottom combustion section. The upper drying and gasification section is arranged vertically and its lower end is connected to the upper end of the bottom combustion section. The flue gas section is arranged horizontally and one end of the flue gas section is connected to the upper end of one side wall of the upper drying and gasification section.

[0006] Furthermore, the bottom surface of the bottom combustion section is inclined and slopes downward in a direction away from the feed pipe, and an ash outlet is provided at the end of the bottom surface of the bottom combustion section away from the feed pipe.

[0007] Furthermore, a primary air inlet is provided on the side wall of the bottom combustion section, one end of the second air branch pipe is connected to the primary air inlet of the bottom combustion section, and the other end of the second air branch pipe and the other end of the first air branch pipe are connected to one end of the main air pipe.

[0008] Furthermore, a first gas regulating valve is provided on the first air branch pipe, a second gas regulating valve is provided on the second air branch pipe, and a main gas regulating valve and a second air pump are provided on the main air pipe.

[0009] Furthermore, a one-way air valve is installed on the first air branch pipe at the end of the first gas regulating valve near the feed pipe.

[0010] Furthermore, the feed pipe is inclined and tilted upwards along the direction close to the combustion furnace. A movable baffle is provided on the inner side of the air inlet at one end of the feed pipe. The upper side of the movable baffle is hinged to the upper side of the inner wall of one end of the feed pipe, and the movable baffle completely covers the air inlet when it is not under force.

[0011] Furthermore, the other end of the feed pipe is provided with a flared opening whose height gradually increases along the direction of approaching the combustion furnace.

[0012] Compared with the prior art, this utility model has the following advantages and effects: This utility model provides a biomass pellet burner, which extracts high-temperature flue gas from the tail end of the combustion furnace and mixes it with air to form a high-speed airflow. The high-speed airflow enables automatic feeding of biomass pellets. This structure makes the biomass pellets less prone to clogging. Moreover, during the feeding process, the high-temperature air dries the biomass pellets, removing water vapor from them, thus ensuring that the biomass pellets entering the combustion furnace are dry pellets. This guarantees the combustion efficiency of the biomass pellets and avoids the generation of toxic gases due to incomplete combustion. In addition, the high-temperature flue gas at the tail end of the combustion section forms an airflow dead zone due to structural problems, causing localized excessively high temperatures and affecting the furnace life. Extracting this part of the flue gas improves the airflow circuit of the combustion section and extends the furnace life. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of a biomass pellet burner according to the present invention.

[0014] Figure 2 This is a partial schematic diagram of the present invention.

[0015] Figure 3 This is a schematic diagram of the combustion furnace of this utility model. Detailed Implementation

[0016] To elaborate on the technical solutions adopted by this utility model to achieve the intended technical objectives, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Furthermore, the technical means or technical features in the embodiments of this utility model can be replaced without creative effort. The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0017] like Figure 1 As shown, this utility model discloses a biomass pellet burner, comprising a combustion furnace 1, a feeding pipe 2, and a feeder 3. The discharge port of the feeder 3 is connected to the upper feed port of one end of the feeding pipe 2, and the other end of the feeding pipe 2 is connected to the combustion furnace 1. Figure 2 As shown, an air inlet is provided at one end of the feed pipe 2, one end of the first air branch pipe 4 is connected to the air inlet of the feed pipe 2, one end of the high-temperature furnace gas pipe 5 is connected to the furnace wall above the ash outlet of the combustion furnace 1, and the other end of the high-temperature furnace gas pipe 5 is connected to the air inlet of the feed pipe 2. A first air pump 6 is provided on the high-temperature furnace gas pipe 5.

[0018] like Figure 3 As shown, the combustion furnace 1 includes a bottom combustion section 7, an upper drying and gasification section 8, and a flue gas section 9. A grate 10 is installed in the bottom combustion section 7. The upper drying and gasification section 8 is vertically oriented, with its lower end connected to the upper end of the bottom combustion section 7. The flue gas section 9 is horizontally oriented, with one end connected to the upper end of one side wall of the upper drying and gasification section 7. After entering the combustion furnace 1, the biomass pellets burn on the upper side of the grate in the bottom combustion section 7. The resulting high-temperature flue gas rises through the upper drying and gasification section 8. This high-temperature flue gas performs secondary drying on the biomass pellets just entering the furnace, while also causing secondary combustion of carbon powder and a small amount of carbon monoxide and other organic gases produced during combustion within the upper drying and gasification section 8. This ensures that the final flue gas in the flue gas section 9 is free of toxic gases and carbon powder.

[0019] The bottom surface of the bottom combustion section 7 is inclined and slopes downwards in the direction away from the feed pipe 2. An ash outlet 11 is provided at the end of the bottom surface of the bottom combustion section 7 away from the feed pipe 2. The inclined bottom surface of the bottom combustion section facilitates the automatic collection of ash and slag into the ash outlet 11 for ash discharge.

[0020] A primary air inlet is located on the side wall of the bottom combustion section 7. One end of the second air branch pipe 12 is connected to the primary air inlet of the bottom combustion section 7, and the other end of the second air branch pipe 12 and the other end of the first air branch pipe 4 are connected to one end of the main air pipe 13. A first gas regulating valve 14 is installed on the first air branch pipe 4, a second gas regulating valve 15 is installed on the second air branch pipe 12, and a main gas regulating valve 16 and a second air pump 17 are installed on the main air pipe 13. The second air pump 17 draws in external air, the main gas regulating valve 16 controls the total intake air volume, and the first gas regulating valve 14 and the second gas regulating valve 15 regulate the airflow in the first air branch pipe 4 and the second air branch pipe 12, respectively.

[0021] A one-way valve 17 is installed on the first air branch pipe 4 at the end of the first gas regulating valve 14 near the feed pipe 2 to prevent high-temperature flue gas from entering the first air branch pipe 4.

[0022] The feed pipe 2 is inclined and slopes upwards towards the combustion furnace 1. A movable baffle 18 is installed inside the air inlet at one end of the feed pipe 2. The upper side of the movable baffle 18 is hinged to the upper side of the inner wall of one end of the feed pipe 2, and the movable baffle 18 completely covers the air inlet when not under force. During operation, high-speed gas flows into the air inlet, which lifts the movable baffle 18 inward, forming a high-speed airflow in the feed pipe 2. This airflow draws out the biomass pellets from the feeder 3 through negative pressure and sends them into the burner 1. This structure can effectively prevent the biomass pellets in the feeder 3 from bridging and affecting the output.

[0023] The other end of the feed pipe 2 is provided with a funnel-shaped opening that gradually increases in height along the direction of the combustion furnace 1. The structure of the funnel-shaped opening can reduce the flow rate of the incoming air and prevent the biomass pellets from hitting the opposite furnace wall due to excessive speed. By controlling the overall air flow rate, the biomass pellets can be effectively diffused in the funnel-shaped opening and evenly distributed in the combustion furnace 1, which facilitates complete combustion in the future.

[0024] When the biomass pellet burner of this utility model is working, the second air pump draws in air, which is divided into two parts. One part is sent to the combustion section through the second air branch pipe as the primary air for biomass pellet combustion, thus providing sufficient oxygen for combustion. The other part of the air mixes with the high-temperature furnace gas drawn from the tail end of the combustion section in the high-temperature furnace gas pipeline, forming a high-speed airflow in the feed pipe. The negative pressure formed by the high-speed airflow draws the biomass pellets out of the feeder and sends them into the combustion furnace. The biomass pellets are slowed down and diffused evenly in the funnel-shaped opening at the other end of the feed pipe before entering the combustion section for complete combustion. The ash produced by combustion is discharged from the ash discharge port. The high-temperature flue gas produced by combustion rises along the upper drying and gasification section to perform secondary drying on the biomass pellets. At the same time, it also performs secondary combustion on combustible and toxic gases such as carbon powder and carbon monoxide produced by incomplete combustion, ensuring the combustion efficiency of the biomass pellets.

[0025] This invention provides a biomass pellet burner that extracts high-temperature flue gas from the tail end of the combustion furnace and mixes it with air to form a high-speed airflow. This high-speed airflow enables automatic feeding of biomass pellets. This structure prevents biomass pellets from clogging, and the high-temperature air dries the biomass pellets during feeding, removing water vapor and ensuring that the biomass pellets entering the combustion furnace are dry. This guarantees efficient combustion and avoids incomplete combustion that could produce toxic gases. Furthermore, the high-temperature flue gas at the tail end of the combustion section creates a dead zone due to the structure, causing localized overheating and affecting the furnace's lifespan. Extracting this portion of flue gas improves the airflow loop in the combustion section and extends the furnace's lifespan.

[0026] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model's technical solution. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present utility model's technical solution, based on the technical essence of the present utility model and within the spirit and principles of the present utility model, shall still fall within the protection scope of the present utility model's technical solution.

Claims

1. A biomass pellet burner, characterized in that: It includes a combustion furnace, a feeding pipe and a feeder. The discharge port of the feeder is connected to the upper feed port of one end of the feeding pipe, and the other end of the feeding pipe is connected to the combustion furnace. An air inlet is provided at one end of the feeding pipe. One end of the first air branch pipe is connected to the air inlet of the feeding pipe. One end of the high-temperature furnace gas pipe is connected to the furnace wall above the ash outlet of the combustion furnace, and the other end of the high-temperature furnace gas pipe is connected to the air inlet of the feeding pipe. A first air pump is provided on the high-temperature furnace gas pipe.

2. The biomass pellet burner according to claim 1, characterized in that: The combustion furnace includes a bottom combustion section, an upper drying and gasification section, and a flue gas section. A grate is provided in the bottom combustion section. The upper drying and gasification section is arranged vertically and its lower end is connected to the upper end of the bottom combustion section. The flue gas section is arranged horizontally and one end of the flue gas section is connected to the upper end of one side wall of the upper drying and gasification section.

3. A biomass pellet burner according to claim 2, characterized in that: The bottom surface of the bottom combustion section is inclined and slopes downward in a direction away from the feed pipe. An ash outlet is provided at the end of the bottom surface of the bottom combustion section away from the feed pipe.

4. A biomass pellet burner according to claim 2, characterized in that: A primary air inlet is provided on the side wall of the bottom combustion section. One end of the second air branch pipe is connected to the primary air inlet of the bottom combustion section, and the other end of the second air branch pipe and the other end of the first air branch pipe are connected to one end of the main air pipe.

5. A biomass pellet burner according to claim 4, characterized in that: The first air branch pipe is equipped with a first gas regulating valve, the second air branch pipe is equipped with a second gas regulating valve, and the main air pipe is equipped with a main gas regulating valve and a second air pump.

6. A biomass pellet burner according to claim 4, characterized in that: A one-way air valve is installed on the first air branch pipe at the end of the first gas regulating valve near the feed pipe.

7. A biomass pellet burner according to claim 1, characterized in that: The feed pipe is inclined and tilted upwards along the direction close to the combustion furnace. A movable baffle is provided on the inner side of the air inlet at one end of the feed pipe. The upper side of the movable baffle is hinged to the upper side of the inner wall of one end of the feed pipe, and the movable baffle completely covers the air inlet when it is not under force.

8. A biomass pellet burner according to claim 7, characterized in that: The other end of the feed pipe is provided with a flared opening whose height gradually increases along the direction of approaching the combustion furnace.

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