Device for preheating biomass fuel using boiler flue gas waste heat

Abstract

The utility model discloses a device for preheating biomass fuel for boiler flue gas waste heat recovery, including heat exchange mechanism, the heat exchange mechanism includes heat exchange box, goes into the smoke pipe, filter plate, heat exchange pipe, spiral pipe, delivery pipe, exhaust pipe, the heat exchange box top is fixedly connected with the smoke pipe, the filter plate is fixedly connected in the inner wall middle, the heat exchange pipe has two respectively fixedly connected in heat exchange box bottom both sides, spiral pipe has two respectively spiral fixedly connected in the inner wall both sides of delivery pipe, spiral pipe import end is fixedly connected with heat exchange pipe bottom end, exhaust pipe has two and is fixedly connected with two spiral pipe's export end respectively. The utility model can recover the heat of flue gas and dry preheat biomass fuel, improve the combustion efficiency and save the energy consumption, and avoid the pollution caused by direct flue gas emission, can quickly complete the replacement of filter plate, guarantee the filtration effect of flue gas fixedly connected in the inclined plane column top.

Description

Technical Field

[0001] This utility model relates to the field of boiler waste heat recovery technology, specifically a device for recovering waste heat from boiler flue gas for preheating biomass fuel. Background Technology

[0002] With the increasing demand for renewable energy, biomass fuel, as a clean energy source, is being used more and more widely. Preheating biomass fuel before combustion can significantly improve combustion efficiency and reduce fuel consumption. However, boilers generate large amounts of high-temperature flue gas during operation, which carries a significant amount of waste heat. Direct emission of this gas not only wastes energy but may also cause thermal pollution to the environment.

[0003] Existing waste heat recovery devices are mostly used to heat boiler feedwater or combustion air, but few are specifically designed for the pre-drying and preheating of biomass fuel before it enters the furnace. Combining the drying and preheating of high-moisture biomass fuel with waste heat recovery from boiler flue gas enables cascaded energy utilization, resulting in significant energy-saving and environmental benefits. Utility Model Content

[0004] The purpose of this invention is to provide a device for recovering waste heat from boiler flue gas for preheating biomass fuel, thereby solving the problems mentioned in the background section. To solve these technical problems, this invention is achieved through the following technical solution: This utility model relates to a device for recovering waste heat from boiler flue gas for preheating biomass fuel, comprising: The heat exchange mechanism includes a heat exchange box, a flue gas inlet pipe, a filter plate, a heat exchange tube, a spiral tube, a conveying pipe, and an exhaust pipe. The top of the heat exchange box is fixedly connected to the flue gas inlet pipe, the filter plate is fixedly connected to the middle of the inner wall, there are two heat exchange tubes respectively fixedly connected to the two sides of the bottom of the heat exchange box, there are two spiral tubes respectively spirally fixedly connected to the two sides of the inner wall of the conveying pipe, the inlet end of the spiral tube is fixedly connected to the bottom end of the heat exchange tube, and there are two exhaust pipes respectively fixedly connected to the outlet ends of the two spiral tubes.

[0005] Furthermore, it also includes an air intake assembly, which includes a cross plate, a first motor, and fan blades; The cross plate is fixedly connected to the inner wall of the end of the smoke inlet pipe, the first motor is fixedly connected to one side of the cross plate, and the fan blade is fixedly connected to the power output end of the first motor.

[0006] Furthermore, a horizontal pipe is fixedly connected to the other end of each of the two exhaust pipes, a vertical pipe is fixedly connected to the middle of the horizontal pipe, a vertical pole is fixedly connected to the end of the vertical pipe, and a water-blocking cap is fixedly connected to the top of the vertical pole.

[0007] Furthermore, a fixing ring is fixedly connected to the back of the heat exchange box, and there are multiple fixing rings. The vertical tube is sleeved inside the fixing ring, and a flared mouth is fixedly connected to the top of the heat exchange tube.

[0008] Furthermore, a second motor is fixedly connected to one side wall of the conveying pipe, and a spiral blade is fixedly connected to the power output end of the second motor. The two ends of the spiral blade are respectively rotatably connected to the two side walls of the conveying pipe.

[0009] Furthermore, a slide rail is fixedly installed on the inner wall of the heat exchange box, the filter plate is slidably connected in the slide rail, a handle is fixedly connected to the middle of the end of the filter plate, and a limit mechanism is fixedly connected to the surface of the heat exchange box.

[0010] Furthermore, the limiting mechanism includes a square tube, an inclined column, a pull column, and a spring; The square tube is fixedly connected to the surface, the inclined column is slidably connected inside the square tube, one end of the pull column is fixedly connected to the top of the inclined column, both ends of the spring are fixedly connected to the top of the inclined column and the inner wall of the top of the square tube, and the other end of the pull column passes through the top of the square tube and is fixedly connected to a pull plate.

[0011] This utility model has the following beneficial effects: In this invention, the flue gas inlet pipe is fixedly connected to the boiler's exhaust pipe. The flue gas is drawn into the heat exchange box through the inlet pipe via the air intake assembly. After being filtered by the filter plate, the flue gas enters the spiral tube through the heat exchange tube. The flue gas heats the spiral tube, which in turn heats the side wall of the conveying pipe, thus preheating the biomass fuel transported through the conveying pipe. This invention not only recovers the heat from the flue gas to dry and preheat the biomass fuel, improving combustion efficiency while saving energy consumption, but also avoids pollution caused by direct emission of flue gas. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the second-view structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the heat exchanger box of this utility model; Figure 4 This utility model Figure 1 A schematic diagram of the structure of part A in the diagram; Figure 5 This utility model Figure 1 A schematic diagram of section B in the diagram.

[0014] The attached diagram lists the components represented by each number as follows: 110. Heat exchanger box; 111. Fixing ring; 112. Slide rail; 120. Flue gas inlet pipe; 130. Filter plate; 131. Handle; 140. Heat exchange tube; 141. Bell mouth; 150. Spiral tube; 160. Conveying pipe; 170. Exhaust pipe; 181. Cross plate; 182. First motor; 183. Fan blade; 191. Horizontal pipe; 192. Vertical pipe; 193. Upright pole; 194. Water-retaining cap; 210. Second motor; 220. Spiral blade; 310, square tube; 320, inclined column; 330, tie column; 331, tie plate; 340, spring. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0017] Please see Figure 1-5 As shown, this utility model is a device for recovering waste heat from boiler flue gas for preheating biomass fuel, comprising: The heat exchange mechanism includes a heat exchange box 110, a flue gas inlet pipe 120, a filter plate 130, a heat exchange tube 140, a spiral tube 150, a conveying pipe 160, and an exhaust pipe 170. The top of the heat exchange box 110 is fixedly connected to the flue gas inlet pipe 120. The filter plate 130 is fixedly connected to the middle of the inner wall of the 100. Two heat exchange tubes 140 are fixedly connected to the bottom two sides of the heat exchange box 110 respectively. Two spiral tubes 150 are fixedly connected to the inner wall two sides of the conveying pipe 160 respectively. The inlet end of the spiral tube 150 is fixedly connected to the bottom end of the heat exchange tube 140. There are two exhaust pipes 170, which are fixedly connected to the outlet ends of the two spiral tubes 150 respectively. The top of the flue gas inlet pipe 120 is connected to the boiler. The exhaust port is fixedly connected, allowing the flue gas to enter the heat exchange box 110 through the flue gas inlet pipe 120. The heat exchange box 110, the flue gas inlet pipe 120, the heat exchange pipe 140, and the outer wall are provided with a heat insulation layer to prevent the heat of the flue gas from being lost. The filter plate 130 filters out toxic substances in the flue gas to avoid polluting the air during discharge. The heat of the flue gas flows in the spiral tube 150 and heats the spiral tube 150. The spiral tube 150 heats the side wall of the conveying pipe 160, so that the biomass fuel transported in the conveying pipe 160 is preheated. The air intake assembly includes a cross plate 181, a first motor 182, and a fan blade 183. The cross plate 181 is fixedly connected to the inner wall of the end of the flue pipe 120. The first motor 182 is fixedly connected to one side of the cross plate 181. The fan blade 183 is fixedly connected to the power output end of the first motor 182. The cross plate 181 facilitates the fixing of the first motor 182. The first motor 182 serves as a power source to drive the fan blade 183 to rotate. The rotation of the fan blade 183 draws the flue gas generated by the boiler into the flue pipe 120. The other ends of the two exhaust pipes 170 are fixedly connected to a horizontal pipe 191, the middle of the horizontal pipe 191 is fixedly connected to a vertical pipe 192, the end of the vertical pipe 192 is fixedly connected to a vertical pole 193, and the top of the vertical pole 193 is fixedly connected to a water-blocking cap 194. The horizontal pipe 191 connects the ends of the two exhaust pipes 170 together, the vertical pipe 192 discharges the cooled hot air in the horizontal pipe 191, and the vertical pole 193 firmly fixes the water-blocking cap 194 to prevent rainwater from entering the vertical pipe 192. A fixing ring 111 is fixedly connected to the back of the heat exchange box 110. There are multiple fixing rings 111. The vertical tube 192 is fitted inside the fixing ring 111. A flared mouth 141 is fixedly connected to the top of the heat exchange tube 140. The fixing ring 111 fixes the vertical tube 192 to prevent it from tilting. The flared mouth 141 increases the range of hot air entering the heat exchange tube 140. A second motor 210 is fixedly connected to one side wall of the conveying pipe 160. A spiral blade 220 is fixedly connected to the power output end of the second motor 210. The two ends of the spiral blade 220 are rotatably connected to the two side walls of the conveying pipe 160. The second motor 210, as the power source, drives the spiral blade 220 to rotate. The spiral blade 220 conveys the biomass fuel added from the feed port of the exhaust pipe 170 to the outlet of the exhaust pipe 170 and puts it into the boiler for combustion. Working principle: After fixing the end of the flue gas inlet pipe 120 to the boiler exhaust port, the first motor 182 is started to drive the fan blades 183 to rotate, so that the flue gas is drawn into the heat exchange box 110 through the flue gas inlet pipe 120. After the flue gas is filtered by the filter plate 130 to remove toxic gases, it enters the heat exchange tube 140 through the two bell mouths 141. The heat exchange tube 140 guides the hot gas into the spiral tube 150 and it flows in the spiral tube 150. After adding biofuel through the feeding port of the conveying pipe 160, the second motor 210 is started to drive the spiral blades 220 to rotate. The rotary blade 220 transports the biomass fuel in the conveying pipe 160. The hot gas transfers heat to the spiral tube 150, and the spiral tube 150 transfers heat to the inner wall of the conveying pipe 160, which in turn heats the biomass fuel in the conveying pipe 160. When the hot gas flows in the spiral tube 150 to the exhaust pipe 170, it enters the vertical pipe 192 through the horizontal pipe 191 and is discharged from the top of the vertical pipe 192. This process can recover the heat of the flue gas, dry and preheat the biomass fuel, improve combustion efficiency, save energy consumption, and avoid pollution caused by direct emission of flue gas.

[0018] Please see Figure 1-5 As shown, this embodiment, based on the above embodiment, further includes: A slide rail 112 is fixedly installed on the inner wall of the heat exchange box 110. The filter plate 130 is slidably connected in the slide rail 112. A handle 131 is fixedly connected to the middle of the end of the filter plate 130. A limit mechanism is fixedly connected to the surface of the heat exchange box 110. The slide rail 112 allows the two sides of the filter plate 130 to slide in the slide rail 112 so that it will not fall off. The handle 131 makes it easy to pull the filter plate 130. The limiting mechanism includes a square tube 310, an inclined column 320, a pull column 330, and a spring 340; Square tube 310 is fixedly connected to surface 100. Inclined column 320 is slidably connected inside square tube 310. One end of pull column 330 is fixedly connected to the top of inclined column 320. Both ends of spring 340 are fixedly connected to the top of inclined column 320 and the inner wall of the top of square tube 310, respectively. The other end of pull column 330 passes through the top of square tube 310 and is fixedly connected to pull plate 331. When the surface of filter plate 130 contacts the inclined surface of inclined column 320, it squeezes inclined column 320 towards square tube 310. The filter plate 130 slides within the slide rail 112 and compresses the spring 340. When the filter plate 130 slides into place within the slide rail 112, the spring 340 rebounds and drives the inclined column 320 to slide out of the square tube 310, so that the straight surface of the square tube 310 contacts the other end surface of the square tube 310, thus restricting the filter plate 130 within the slide rail 112 and preventing it from sliding out. The pull plate 331 facilitates the pulling of the pull column 330, and the pull column 330 pulls the inclined column 320 to slide into the square tube 310, making it convenient to pull out the filter plate 130 for replacement. Working principle: Filter plate 130 needs to be replaced promptly due to long-term filtration of flue gas. During replacement, pulling plate 331 drives pull column 330 to pull inclined column 320 into square tube 310, disengaging the straight surface of square tube 310 from the straight surface of filter plate 130. Then, pulling handle 131 pulls filter plate 130 out of slide rail 112. Releasing pull plate 331 allows the new filter plate 130 to be inserted into slide rail 112, ensuring the end of filter plate 130 contacts the inclined surface of inclined column 320 and is then pressed together. The inclined column 320 slides into the square tube 310 and compresses the spring 340. When the filter plate 130 slides into the slide rail 112, the spring 340 rebounds and drives the inclined column 320 to slide out of the square tube 310 so that the straight surface of the square tube 310 contacts the other end surface of the square tube 310, thus restricting the filter plate 130 in the slide rail 112 and preventing it from sliding out. This allows for quick replacement of the filter plate 130 and ensures the filtration effect of the flue gas. The filter plate 130 is fixedly connected to the top of the inclined column 320.

[0019] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A device for recovering waste heat from boiler flue gas for preheating biomass fuel, characterized in that, include: The heat exchange mechanism includes a heat exchange box (110), a flue gas inlet pipe (120), a filter plate (130), a heat exchange tube (140), a spiral tube (150), a conveying pipe (160), and an exhaust pipe (170). The top of the heat exchange box (110) is fixedly connected to the flue gas inlet pipe (120), the filter plate (130) is fixedly connected to the middle of the inner wall of (100), there are two heat exchange tubes (140) respectively fixedly connected to the bottom two sides of the heat exchange box (110), there are two spiral tubes (150) respectively spirally fixedly connected to the inner wall two sides of the conveying pipe (160), the inlet end of the spiral tube (150) is fixedly connected to the bottom end of the heat exchange tube (140), and there are two exhaust pipes (170) respectively fixedly connected to the outlet ends of the two spiral tubes (150).

2. The apparatus for recovering waste heat from boiler flue gas for preheating biomass fuel according to claim 1, characterized in that: It also includes an air intake assembly, which includes a cross plate (181), a first motor (182), and a fan blade (183). The cross plate (181) is fixedly connected to the inner wall of the end of the smoke inlet pipe (120), the first motor (182) is fixedly connected to one side of the cross plate (181), and the fan blade (183) is fixedly connected to the power output end of the first motor (182).

3. The apparatus for recovering waste heat from boiler flue gas for preheating biomass fuel according to claim 1, characterized in that: The other end of the two exhaust pipes (170) is fixedly connected to a horizontal pipe (191), the middle of the horizontal pipe (191) is fixedly connected to a vertical pipe (192), the end of the vertical pipe (192) is fixedly connected to a pole (193), and the top of the pole (193) is fixedly connected to a water-blocking cap (194).

4. The apparatus for recovering waste heat from boiler flue gas for preheating biomass fuel according to claim 3, characterized in that: The heat exchange box (110) is fixedly connected to a fixing ring (111) on the back. There are multiple fixing rings (111). The vertical tube (192) is sleeved inside the fixing ring (111). The heat exchange tube (140) is fixedly connected to a flared mouth (141) at the top.

5. The apparatus for recovering waste heat from boiler flue gas for preheating biomass fuel according to claim 3, characterized in that: A second motor (210) is fixedly connected to one side wall of the conveying pipe (160), and a spiral blade (220) is fixedly connected to the power output end of the second motor (210). The two ends of the spiral blade (220) are respectively rotatably connected to the two side walls of the conveying pipe (160).

6. The apparatus for recovering waste heat from boiler flue gas for preheating biomass fuel according to claim 3, characterized in that: The heat exchange box (110) is fixedly provided with a slide rail (112) on the inner wall, the filter plate (130) is slidably connected in the slide rail (112), a handle (131) is fixedly connected in the middle of the end of the filter plate (130), and a limit mechanism is fixedly connected on the surface of the heat exchange box (110).

7. The apparatus for recovering waste heat from boiler flue gas for preheating biomass fuel according to claim 6, characterized in that: The limiting mechanism includes a square tube (310), an inclined column (320), a pull column (330), and a spring (340); The square tube (310) is fixedly connected to the surface of (100), the inclined column (320) is slidably connected inside the square tube (310), one end of the pull column (330) is fixedly connected to the top of the inclined column (320), both ends of the spring (340) are fixedly connected to the top of the inclined column (320) and the inner wall of the top of the square tube (310), and the other end of the pull column (330) passes through the top of the square tube (310) and is fixedly connected to a pull plate (331).

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