A system for utilizing waste heat from flue gas prepared by bamboo leaf ash

Abstract

This utility model relates to the field of bamboo aggregate preparation technology, specifically to a system for utilizing waste heat from bamboo leaf ash preparation flue gas. The system includes a calcining furnace, a drying device, and a drying tower. The calcining furnace is connected to the drying device and the drying tower. A partition plate is installed inside the calcining furnace, dividing it into a first chamber and a second chamber. A preparation cylinder is installed in the second chamber and is detachably mounted on the partition plate. Several through holes are provided on the partition plate, and the first chamber communicates with the second chamber through these through holes. The system also includes a collector, pipe A, and pipe B. The collector communicates with the second chamber, and the end of pipe B communicates with the drying tower. This system solves the problems of low energy utilization efficiency in the preparation of functional additives in bamboo aggregate concrete production, lack of waste heat recovery from bamboo leaf calcination, and energy waste caused by fragmented heat supply in various process stages.

Description

Technical Field

[0001] This utility model relates to the field of bamboo aggregate preparation technology, specifically to a system for utilizing waste heat from flue gas generated during bamboo leaf ash preparation. Background Technology

[0002] In the field of green building materials technology, the high-value utilization of bamboo resources has become an important development direction for promoting the low-carbon transformation of the construction industry. Although the technical path of using bamboo aggregate to replace traditional mineral aggregate in concrete preparation has shown significant ecological benefits, its industrialization process is deeply constrained by energy efficiency. In the production system of bamboo aggregate concrete, the preparation of functional additives (such as bamboo leaf ash, cellulose nanocrystals, etc.) has exposed a prominent energy efficiency contradiction: bamboo leaf ash, as a key component, requires multiple processes such as washing, thermal drying, and high-temperature calcination. Among them, the high moisture content of bamboo leaves after washing (60%-80%) makes the drying process the main unit of heat energy consumption. As for the cellulose nanocrystal component used to enhance the performance of concrete, its industrial preparation requires the bamboo particles to undergo delignification treatment through heating, followed by hemicellulose removal, acid hydrolysis, and other steps to produce a cellulose nanocrystal suspension. Finally, the cellulose nanocrystal suspension is dried to transform into granular cellulose nanocrystals.

[0003] It is worth noting that the high-temperature flue gas generated during the calcination of bamboo leaves contains a large amount of unused sensible heat resources. However, the existing production process allows this waste heat to be directly emitted. At the same time, the existing technology configures completely independent heat energy supply systems for bamboo leaf drying, cellulose nanocrystal suspension preparation and cellulose nanocrystal drying preparation. This spatial disconnect between energy supply and demand, as well as the gaps between processes, not only leads to the complete waste of waste heat resources in the bamboo leaf ash preparation system itself, but also forces production enterprises to meet the heat energy requirements of preparation, drying, and other stages through dual or multiple energy inputs. This energy allocation method not only violates the original intention of low-carbon development of bamboo building materials, but also restricts its large-scale promotion as an environmentally friendly material. The deeper technical bottleneck lies in the fact that the existing technical framework has not yet built a heat energy coupling mechanism covering the entire bamboo processing process. It is impossible to achieve heat energy self-sufficiency of the production system through waste heat recovery, and it is also difficult to establish energy efficiency synergy between key processes such as bamboo leaf calcination, bamboo leaf drying pretreatment, bamboo particle delignification treatment, and cellulose nanocrystal drying. As a result, the entire production system has always been stuck in the extensive stage of energy utilization, making it difficult to achieve closed-loop utilization of heat energy within the production system.

[0004] Therefore, the inventors have proposed a system for utilizing waste heat from the preparation of flue gas from bamboo leaf ash to solve the aforementioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a waste heat utilization system for flue gas from bamboo leaf ash preparation, which aims to solve the problems of low energy utilization efficiency in the preparation of functional additives in bamboo aggregate concrete production, lack of recovery and utilization of waste heat from bamboo leaf calcination, and energy waste caused by the fragmented heat supply in various process stages.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A system for utilizing waste heat from flue gas produced by bamboo leaf ash preparation includes a calcining furnace, a drying device, and a drying tower, wherein the calcining furnace is connected to the drying device and the drying tower;

[0008] The calcining furnace is equipped with a partition plate, which divides the calcining furnace into a first chamber and a second chamber. A preparation cylinder is provided in the second chamber and is detachably mounted on the partition plate. The partition plate has several through holes, and the first chamber communicates with the second chamber through each of the through holes.

[0009] It also includes a collector, pipe A and pipe B, the collector being connected to the second chamber, pipe A and pipe B being connected to the collector, the end of pipe A being connected to the drying device, and the end of pipe B being connected to the drying tower.

[0010] According to the above technical solution, this system utilizes the high-temperature flue gas generated during the combustion of bamboo leaves in the calcining furnace to produce bamboo leaf ash as a core heat source for tiered utilization. Specifically, bamboo leaves are calcined in the first chamber of the calcining furnace to form bamboo leaf ash. The heat is directly applied to the preparation cylinder in the second chamber (used for heat-requiring processes such as delignification of bamboo particles, utilizing the high-temperature waste heat of the flue gas). Simultaneously, the generated high-temperature flue gas enters the second chamber through the through-holes in the partition plate. Subsequently, the flue gas carrying the remaining heat is collected and the collector acts as a distribution hub, guiding part of the flue gas to the drying device through pipe A. The waste heat of the flue gas is used to dry the cleaned and moistened bamboo leaves (bamboo leaf ash). The system includes a pretreatment stage for the preparation of cellulose nanocrystals; simultaneously, another portion of the flue gas is directed to a drying tower via pipe B, where the waste heat from the flue gas is used to dry the cellulose nanocrystal suspension into the required cellulose nanocrystal particles (functional additive preparation stage). This system efficiently recovers the waste heat from the calcination flue gas that was originally directly emitted and distributes it to multiple energy-consuming stages that require independent heating, such as bamboo leaf pretreatment drying, bamboo particle delignification treatment, and cellulose nanocrystal drying. At the same time, the system also utilizes the flue gas to heat the second chamber inside the calcination furnace, realizing the integrated and tiered utilization of the waste heat from the flue gas in the bamboo leaf ash preparation and related additive production process, significantly reducing the overall energy consumption.

[0011] Furthermore, the pipe A includes a first pipe, a second pipe, and a third pipe. One end of the first pipe is connected to the collector, the other end of the first pipe is connected to the second pipe, and the second pipe is connected to the third pipe.

[0012] Furthermore, it also includes a power generation structure, which has a first air inlet and a first air outlet. The first air inlet is connected to the third pipe, and the first air outlet is connected to a fourth pipe, which is connected to the drying device.

[0013] The power generation structure includes a first housing and a second housing connected to the first housing. A rotating shaft and a turbine fixed on the rotating shaft are rotatably disposed inside the first housing. A generator is disposed inside the second housing, and the rotating shaft is connected to the generator.

[0014] The first air inlet and the first air outlet are disposed on the first housing. The first air inlet is connected to the third pipe, and the first air outlet is connected to the fourth pipe.

[0015] Furthermore, the drying device includes a drying chamber and an air inlet pipe connected to the drying chamber. A second air inlet is provided on the air inlet pipe, and the fourth pipe is connected to the second air inlet. A second air outlet is provided at the end of the drying chamber away from the air inlet pipe.

[0016] At least one flue gas filter is installed inside the air intake pipe.

[0017] Furthermore, the collector includes a conical gas collection box and a collection bottle. Both the first pipe and the pipe B are connected to the inner cavity of the conical gas collection box. Filter screens are provided at the connection between the first pipe and the conical gas collection box and at the connection between the pipe B and the conical gas collection box.

[0018] The collection bottle is detachably mounted on the bottom of the conical gas collection box.

[0019] Furthermore, the top of the calcining furnace is provided with a cover, and a stirring element is detachably connected to the cover. The stirring element extends into the preparation cylinder to perform delignification treatment on the bamboo particles.

[0020] The stirring component includes a motor that is detachably mounted on the cover, and a stirring roller is connected to the output shaft of the motor. The stirring roller is provided with a plurality of stirring blades.

[0021] Furthermore, a ceramic partition is provided in the first chamber, which divides the first chamber into a calcination chamber and an ash storage chamber, and the ceramic partition is provided with a number of ash leakage holes.

[0022] Furthermore, it also includes a heat exchanger, which is provided with a third air inlet, a third air outlet, a water inlet, and a water outlet;

[0023] An air inlet branch pipe is provided at the connection between the first pipe and the second pipe, and an air outlet branch pipe is provided at the connection between the second pipe and the third pipe. The air inlet branch pipe is connected to the third air inlet, and the air outlet branch pipe is connected to the third air outlet.

[0024] A cold water pipe is connected to the water inlet, and a hot water pipe is connected to the water outlet.

[0025] Furthermore, pipe B is a fifth pipe, one end of which is connected to the collector, and the other end of which is connected to the drying tower.

[0026] Furthermore, a first valve is provided on the second pipe, a second valve is provided on the air inlet branch pipe, a third valve is provided on the air outlet branch pipe, and a fourth valve is provided on the fifth pipe.

[0027] The beneficial effects of this utility model are:

[0028] 1. This utility model creatively utilizes the high-temperature flue gas generated by the calcining furnace as a core heat source for systematic recovery and distribution. The waste heat from the flue gas is first used inside the calcining furnace to heat the preparation cylinder for delignification treatment of bamboo particles. Subsequently, the remaining flue gas is collected and directed to a drying device for pre-drying of bamboo leaves after washing. Simultaneously, another portion of the flue gas is directed to a drying tower for drying the cellulose nanocrystal suspension. This design breaks the original pattern of independent operation of the thermal energy systems of each process, constructing a thermal energy coupling mechanism covering key links such as bamboo leaf ash preparation, bamboo leaf pretreatment, bamboo delignification, and nanocrystal drying. This significantly reduces the repeated input of external energy and promotes the production system towards thermal energy self-sufficiency and closed-loop utilization.

[0029] 2. This invention, building upon the existing model of directly utilizing waste heat from flue gas for material drying (bamboo leaves, nanocrystalline suspension) and process heating (delignification), further integrates a power generation structure and a heat exchanger. High-temperature flue gas drives a turbine to generate electricity, converting the kinetic energy of the flue gas into usable electrical energy. The flue gas after power generation is then used in subsequent drying stages, forming a tiered utilization path of "kinetic energy power generation - thermal energy drying." Simultaneously, through a bypass heat exchanger design, heat can be extracted from the main flue gas path as needed to heat cold water, producing hot water for other uses. This multi-level, multi-form energy recovery and conversion greatly improves the comprehensive utilization efficiency and value of a single heat source (calcination flue gas).

[0030] 3. This utility model efficiently integrates previously dispersed calcination, drying, delignification, power generation, and heat exchange devices through a pipeline network, a collector (including filtration and dust collection functions), and a multi-valve control system. The coordinated valve control enables flexible allocation and precise adjustment of flue gas flow across multiple paths, including drying, power generation, and heat exchange, adapting to different operating conditions and heat load requirements. The flue gas filter in the inlet pipe effectively purifies the flue gas entering the drying chamber, preventing particulate matter contamination of materials; the dust collection bottle at the bottom of the collector facilitates regular cleaning of settled solid impurities. This integrated design not only simplifies equipment layout and optimizes energy management but also improves the cleanliness and ease of operation of the production process.

[0031] Other advantages, objectives, and features of this application 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 study, or may be learned from practice of this application. The objectives and other advantages of this application may be realized and obtained through the detailed embodiments described below. Attached Figure Description

[0032] Figure 1 A schematic diagram of the overall connection structure of the flue gas waste heat utilization system for preparing bamboo leaf ash according to this utility model;

[0033] Figure 2 Partial structure of the flue gas waste heat utilization system for preparing bamboo leaf ash according to this utility model (visual representation) Figure 1 ) Schematic diagram;

[0034] Figure 3 A top view schematic diagram of the flue gas waste heat utilization system for preparing bamboo leaf ash according to this utility model;

[0035] Figure 4 In the flue gas waste heat utilization system for bamboo leaf ash preparation of this utility model Figure 3 AA sectional view;

[0036] Figure 5 Partial structure of the flue gas waste heat utilization system for preparing bamboo leaf ash according to this utility model (visual representation) Figure 2 ) Schematic diagram;

[0037] Figure 6 An exploded structural diagram of the power generation structure in the flue gas waste heat utilization system for bamboo leaf ash preparation according to this utility model.

[0038] Figure 7 This is a cross-sectional schematic diagram of the drying device in the flue gas waste heat utilization system for bamboo leaf ash preparation according to this utility model.

[0039] The components include: calcining furnace 1, partition plate 11, through hole 111, first chamber 12, second chamber 13, preparation cylinder 14, drying device 2, drying box 21, air inlet pipe 22, second air inlet 221, second air outlet 222, flue gas filter 223, drying tower 3, collector 4, conical gas collecting box 41, collecting bottle 42, filter screen 43, cover 5, first pipe 51, second pipe 52, first valve 521, second valve 522, and third valve 52. 3. Fourth valve 551, Third pipe 53, Fourth pipe 54, Fifth pipe 55, Power generation structure 6, First housing 61, First air inlet 611, First air outlet 612, Second housing 62, Rotating shaft 63, Turbine 64, Generator 65, Ceramic partition 7, Heat exchanger 8, Third air inlet 81, Third air outlet 82, Water inlet 83, Water outlet 84, Air inlet branch pipe 85, Air outlet branch pipe 86, Agitator 9, Motor 91, Agitator roller 92. Detailed Implementation

[0040] The embodiments of this utility model will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be understood that the preferred embodiments are only for illustrating this utility model and not for limiting the scope of protection of this utility model.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] This embodiment proposes a system for utilizing waste heat from flue gas generated from bamboo leaf ash, such as... Figures 1 to 7 As shown, the apparatus includes a calcining furnace 1, a drying device 2, and a drying tower 3. The calcining furnace 1 is connected to the drying device 2 and the drying tower 3 via pipes. The drying tower 3 is used to dry the cellulose nanocrystal suspension. Specifically, the drying tower 3 uses a spray drying process to dry the cellulose nanocrystal suspension. The cellulose nanocrystal suspension is slowly pumped into the spray drying tower 3 at a feed rate of 3L / h to dry and form cellulose nanocrystal particles. It should be noted that the drying tower 3 and the spray drying process are equipment and technologies well known to those skilled in the art, and will not be described in detail here.

[0043] Drying device 2 is used to dry the bamboo leaves that are still moist after cleaning. It should be noted that cleaning the bamboo leaves is necessary because impurities (such as calcium, iron, and other minerals) adhering to the leaves can interfere with the calcination reaction pathways of the major elements such as silicon and potassium. Cleaning helps maintain the amorphous silica and potassium carbonate as the main components of bamboo leaf ash, ensuring its stable alkali activation and micro-aggregate filling effect in subsequent bamboo aggregate concrete. In this embodiment, the purpose of drying device 2 is to dry the bamboo leaves to facilitate the subsequent calcination of the bamboo leaves to form bamboo leaf ash.

[0044] like Figure 4 As shown, a partition plate 11 is provided inside the calcining furnace 1, dividing the calcining furnace 1 into a first chamber 12 and a second chamber 13. The first chamber 12 is located below the second chamber 13. A preparation cylinder 14 is provided inside the second chamber 13. The preparation cylinder 14 is detachably installed on the partition plate 11. Specifically, the preparation cylinder 14 is installed in the middle position of the partition plate 11 by a snap-fit ​​method. Several through holes 111 are opened on the partition plate 11. The first chamber 12 is connected to the second chamber 13 through the through holes 111. In this embodiment, the preparation cylinder 14 is used to perform delignification treatment on bamboo particles. Specifically, the drained bamboo particles are placed in a sodium hydroxide solution with a mass fraction of 5%-10% and a liquid-to-solid ratio of 10:1-15:1. The mixture is stirred and reacted for 2-4 hours under heating to achieve delignification treatment. After delignification treatment, the solid and liquid of the bamboo particles are separated by filtration or centrifugation. The bamboo fibers are repeatedly washed with clean water until the pH value of the washing solution is close to neutral. In this example, the calcining furnace 1 calcines the bamboo leaf ash, and while preparing the bamboo leaf ash, it can also heat the preparation cylinder 14 to achieve the effect of delignification treatment of bamboo particles. This utilizes the heat generated during the preparation of bamboo leaf ash and avoids heat source waste.

[0045] It also includes a collector 4, pipe A, and pipe B. Collector 4 is connected to the second chamber 13, and pipes A and B are both connected to collector 4. The end of pipe A is connected to the drying device 2, and the end of pipe B is connected to the drying tower 3. In this embodiment, the high-temperature hot gas / flue gas generated when the calcining furnace 1 burns bamboo leaves to produce bamboo leaf ash is used as the core heat source for tiered utilization. Specifically, the bamboo leaves are calcined in the first chamber 12 of the calcining furnace 1 to form bamboo leaf ash. The heat is directly applied to the preparation cylinder 14 in the second chamber 13 (used for heat-requiring processes such as delignification treatment of bamboo particles, utilizing the high-temperature heat of the flue gas). At the same time, the high-temperature flue gas generated enters the second chamber 13 through the through hole 111 on the partition plate 11. Subsequently, the flue gas carrying the remaining heat flows into the collector. Collector 4 acts as a distribution hub, guiding part of the flue gas to the drying device 2 through pipe A, where the residual heat of the flue gas is used to dry and clean the remaining ash. The system utilizes the waste heat from the calcination flue gas to dry the cellulose nanocrystal suspension into the required cellulose nanocrystal particles (functional additive preparation stage). Simultaneously, another portion of the flue gas is directed to the drying tower 3 via pipe B, where the waste heat is used to dry the cellulose nanocrystal suspension into the desired cellulose nanocrystal particles. This system recovers and utilizes the waste heat from the calcination flue gas that was originally directly emitted, distributing it to multiple energy-consuming stages requiring independent heating, such as bamboo leaf pretreatment drying, bamboo particle delignification treatment, and cellulose nanocrystal drying. Simultaneously, the preparation cylinder 14 is heated inside the calcination furnace 1, achieving integrated and tiered utilization of waste heat in the bamboo leaf ash preparation and related additive production process, thereby reducing energy consumption.

[0046] As a preferred embodiment, such as Figure 5 As shown, pipe A includes a first pipe 51, a second pipe 52, and a third pipe 53. One end of the first pipe 51 is connected to the collector 4, and the other end of the first pipe 51 (i.e., Figure 5 In the middle, the bottom end of the first pipe 51 is connected to the second pipe 52, and the bottom end of the second pipe 52 is connected to the third pipe 53.

[0047] In one possible implementation, the third pipe 53 is connected to the drying device 2. That is, the high-temperature flue gas first enters the first pipe 51 from the collector 4, and then the flue gas flows through the first pipe 51 into the second pipe 52 and the third pipe 53 connected to it. The high-temperature flue gas is directly introduced into the drying device 2 through the third pipe 53, thereby using the heat energy and airflow contained in the flue gas to efficiently dry the cleaned and moistened bamboo leaves.

[0048] As an exemplary implementation, such as Figure 1 , Figure 5 and Figure 6As shown, it also includes a power generation structure 6, which has a first air inlet 611 and a first air outlet 612. The first air inlet 611 is connected to a third pipe 53, and the first air outlet 612 is connected to a fourth pipe 54, which is connected to the drying device 2. In this embodiment, the power generation structure 6 is added at the end of the third pipe 53. Figure 6 As shown, the power generation structure 6 includes a first housing 61 and a second housing 62 connected to the first housing 61. A rotating shaft 63 and a turbine 64 fixed on the rotating shaft 63 are rotatably arranged inside the first housing 61. A generator 65 is arranged inside the second housing 62, and the rotating shaft 63 is connected to the generator 65. It should be noted that the rotation of the rotating shaft 63 drives the rotor inside the generator 65 to cut magnetic field lines and convert mechanical energy into electrical energy, which is existing technology. A first air inlet 611 and a first air outlet 612 are arranged on the first housing 61. The first air inlet 611 is connected to the third pipe 53, and the first air outlet 612 is connected to the fourth pipe 54.

[0049] In this embodiment, the high-temperature flue gas generated by the calcining furnace 1 is transported to the first air inlet 611 of the power generation structure 6, impacting the turbine 64 blades fixed on the rotating shaft 63. The turbine 64 rotates at high speed under the action of the flue gas kinetic energy, driving the rotating shaft 63 connected to it to rotate synchronously. Since the other end of the rotating shaft 63 is directly connected to the generator 65 in the second housing 62, the mechanical rotation of the turbine 64 is transmitted to the generator 65 through the rotating shaft 63, driving the coil inside the generator 65 to cut the magnetic field lines. Based on the principle of electromagnetic induction, the mechanical energy is converted into electrical energy. The flue gas after completing the work is discharged through the first air outlet 612 and continues to be transported to the drying device 2 through the fourth pipe 54 for the pre-treatment drying of bamboo leaves, forming a "power generation-drying" cascade energy utilization path.

[0050] As a preferred embodiment, such as Figure 7 As shown, the drying device 2 includes a drying chamber 21 and an air inlet pipe 22 connected to the drying chamber 21. A second air inlet 221 is provided on the air inlet pipe 22. A fourth pipe 54 is connected to the second air inlet 221. The end of the drying chamber 21 furthest from the air inlet pipe 22 (i.e., the end furthest from the air inlet pipe 22) Figure 7 In the middle, the right end of the drying box 21 is provided with a second air outlet 222, and at least one flue gas filter 223 is provided in the air inlet pipe 22. In this embodiment, it is preferred that the number of flue gas filters 223 is two.

[0051] In this embodiment, the flue gas carrying residual heat enters the intake pipe 22 from the fourth pipe 54 via the second intake port 221. Before flowing to the drying chamber 21, the flue gas passes through the flue gas filter screen 223 in the intake pipe 22. The filter screen 43 captures solid particles and impurities in the flue gas. The purified flue gas then enters the drying chamber 21, where the moist bamboo leaves are dried through heat exchange. The low-temperature flue gas that has completed the drying process is finally discharged from the second exhaust port 222, thus utilizing the residual heat.

[0052] In one possible implementation, a fan is provided inside the air intake pipe 22 to accelerate the airflow inside the air intake pipe 22 into the drying chamber 21, thereby improving the drying effect.

[0053] As a preferred embodiment, such as Figure 1 and Figure 2 As shown, the collector 4 includes a conical gas collecting box 41 and a collecting bottle 42. The first pipe 51 and the pipe B are both connected to the inner cavity of the conical gas collecting box 41. Filter screens 43 are provided at the connection between the first pipe 51 and the conical gas collecting box 41 and at the connection between the pipe B and the conical gas collecting box 41. The collecting bottle 42 is detachably installed at the bottom of the conical gas collecting box 41 by means of a threaded connection.

[0054] In this embodiment, after the high-temperature flue gas enters the conical gas collection box 41 from the calcining furnace 1, the flow rate decreases due to the expansion of the cross-section, which to a certain extent can promote the solid particles in the flue gas to settle along the conical wall under the action of gravity. The first pipe 51 connected to the drying device 2 and the pipe B leading to the drying tower 3 are respectively connected from the top of the gas collection box. The filter screen 43 set at the connection port is intended to intercept residual fine dust and prevent particulate matter from entering the subsequent pipes or contaminating the drying / drying materials. The settled and filtered particulate matter falls into the removable collection bottle 42 at the bottom for centralized storage, realizing the separation and recovery of flue gas impurities.

[0055] As a preferred embodiment, such as Figure 1 , Figure 2 and Figure 4 As shown, the top of the calcining furnace 1 is equipped with a cover 5, and a stirring element 9 is detachably connected to the cover 5 by bolts. The stirring element 9 extends into the preparation cylinder 14 to perform delignification treatment on the bamboo particles; as shown Figure 4As shown, the stirring component 9 includes a motor 91 bolted to the cover 5. A stirring roller 92 is connected to the output shaft of the motor 91. The stirring roller 92 is equipped with several stirring blades. When the bamboo particles are in a sodium hydroxide solution with a mass fraction of 5%-10%, the cover 5 is used to seal the preparation cylinder 14 and the second chamber 13. When the motor 91 on the cover 5 is started, it drives the stirring roller 92 to rotate, which in turn drives the stirring blades on the stirring roller 92 to continuously stir the bamboo particles, so that they are evenly heated in the heating environment and complete the delignification treatment of the bamboo particles. After further processing through multiple subsequent steps, the treated bamboo particles can be used for the subsequent preparation of cellulose nanocrystals, realizing the integration of multiple processes in the bamboo aggregate preparation process.

[0056] As a preferred embodiment, such as Figure 4 The first chamber 12 is equipped with a ceramic partition 7, which divides the first chamber 12 into a calcination chamber and an ash storage chamber. The ceramic partition 7 has several ash leakage holes. The ceramic partition 7 divides the first chamber 12 of the calcination furnace 1 into an upper calcination chamber and a lower ash storage chamber. The ash produced after the bamboo leaves are calcined in the calcination chamber automatically falls into the ash storage chamber through the ash leakage holes on the ceramic partition 7. The bottom of the ash storage chamber is detachably connected to an installation plate (not shown) via a snap-fit ​​mechanism. Removing the installation plate facilitates the removal of the bamboo leaf ash, which is used for subsequent bamboo aggregate preparation.

[0057] As a preferred embodiment, such as Figure 3 As shown, a heat exchanger 8 is also installed on one side of the calcining furnace 1; as Figure 1 As shown, the heat exchanger 8 is provided with a third air inlet 81, a third air outlet 82, a water inlet 83, and a water outlet 84. An air inlet branch pipe 85 is provided at the connection between the first pipe 51 and the second pipe 52, and an air outlet branch pipe 86 is provided at the connection between the second pipe 52 and the third pipe 53. The air inlet branch pipe 85 is connected to the third air inlet 81, and the air outlet branch pipe 86 is connected to the third air outlet 82. A cold water pipe is connected to the water inlet 83, and a hot water pipe is connected to the water outlet 84. It should be noted that the heat exchanger 8 used in this embodiment is a conventional heat exchanger 8 currently available on the market, such as a partition wall heat exchanger or a tubular heat exchanger, as long as it can extract heat from the flue gas for water intake and exhaust.

[0058] In this embodiment, high-temperature flue gas is diverted from the first pipe 51 through the inlet branch pipe 85 to the third inlet 81 of the heat exchanger 8. Inside the heat exchanger 8, it undergoes counter-current heat exchange with the cold water injected through the cold water pipe. The flue gas after heat extraction flows back to the third pipe 53 from the third outlet 82 through the outlet branch pipe 86, while the heated hot water is output from the hot water pipe. This process achieves on-demand extraction of waste heat from the flue gas through bypass diversion, while maintaining the integrity of continuous heating from the main flue gas passage to the drying device 2.

[0059] In a preferred embodiment, pipe B is the fifth pipe 55, with one end connected to collector 4 and the other end connected to drying tower 3. The second pipe 52 is equipped with a first valve 521, the inlet branch pipe 85 with a second valve 522, the outlet branch pipe 86 with a third valve 523, and the fifth pipe 55 with a fourth valve 551. The first valve 521 controls the main flue gas flow rate of the second pipe 52, adjusting the basic heat source intensity flowing to the drying device 2. The second valve 522 and the third valve 523 are operated synchronously (activating the heat exchange branch when open and blocking it when closed) to flexibly start and stop the heat exchanger 8. Simultaneously, the fourth valve 551 independently regulates the flue gas flow rate from the fifth pipe 55 to the drying tower 3, distributing the input flue gas to the drying tower 3. These valves work together to form a multi-node flue gas control system, enabling the system to adapt and adjust according to drying intensity, hot water demand, and drying load, switching waste heat distribution strategies in real time and maintaining pipeline pressure balance.

[0060] The above embodiments are merely preferred embodiments provided to fully illustrate the present utility model, and the protection scope of the present utility model is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present utility model are all within the protection scope of the present utility model.

Claims

1. A bamboo leaf ash preparation flue gas waste heat utilization system, characterized in that, include: A calcining furnace (1), a drying device (2), and a drying tower (3), wherein the calcining furnace (1) is connected to the drying device (2) and the drying tower (3); The calcining furnace (1) is provided with a partition plate (11), which divides the calcining furnace (1) into a first chamber (12) and a second chamber (13). A preparation cylinder (14) is provided in the second chamber (13), and the preparation cylinder (14) is detachably installed on the partition plate (11). The partition plate (11) is provided with a plurality of through holes (111), and the first chamber (12) is connected to the second chamber (13) through each of the through holes (111). It also includes a collector (4), pipe A and pipe B, the collector (4) being connected to the second chamber (13), pipe A and pipe B being connected to the collector (4), the end of pipe A being connected to the drying device (2), and the end of pipe B being connected to the drying tower (3).

2. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to claim 1, characterized in that: The pipe A includes a first pipe (51), a second pipe (52) and a third pipe (53). One end of the first pipe (51) is connected to the collector (4), and the other end of the first pipe (51) is connected to the second pipe (52). The second pipe (52) is connected to the third pipe (53).

3. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to claim 2, characterized in that: It also includes a power generation structure (6), which has a first air inlet (611) and a first air outlet (612). The first air inlet (611) is connected to the third pipe (53), and the first air outlet (612) is connected to a fourth pipe (54). The fourth pipe (54) is connected to the drying device (2). The power generation structure (6) includes a first housing (61) and a second housing (62) connected to the first housing (61). A rotating shaft (63) and a turbine (64) fixed on the rotating shaft (63) are rotatably arranged inside the first housing (61). A generator (65) is arranged inside the second housing (62). The rotating shaft (63) is connected to the generator (65). The first air inlet (611) and the first air outlet (612) are disposed on the first housing (61). The first air inlet (611) is connected to the third pipe (53), and the first air outlet (612) is connected to the fourth pipe (54).

4. The waste heat utilization system for bamboo leaf ash preparation according to claim 3, characterized in that: The drying device (2) includes a drying box (21) and an air inlet pipe (22) connected to the drying box (21). The air inlet pipe (22) is provided with a second air inlet (221). The fourth pipe (54) is connected to the second air inlet (221). The drying box (21) is provided with a second air outlet (222) at the end away from the air inlet pipe (22). At least one flue gas filter (223) is provided inside the air intake pipe (22).

5. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to claim 2, characterized in that: The collector (4) includes a conical gas collection box (41) and a collection bottle (42). The first pipe (51) and the pipe B are both connected to the conical gas collection box (41). A filter screen (43) is provided at the connection between the first pipe (51) and the conical gas collection box (41) and at the connection between the pipe B and the conical gas collection box (41). The collection bottle (42) is detachably mounted on the bottom of the conical gas collection box (41).

6. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to any one of claims 2 to 4, characterized in that: The top of the calcining furnace (1) is provided with a cover (5), and a stirring element (9) is detachably connected to the cover (5). The stirring element (9) extends into the preparation cylinder (14) to perform delignification treatment on the bamboo particles. The stirring component (9) includes a motor (91) detachably mounted on the cover (5), and a stirring roller (92) is connected to the output shaft of the motor (91). The stirring roller (92) is provided with a plurality of stirring blades.

7. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to claim 6, characterized in that: A ceramic partition (7) is provided in the first chamber (12), which divides the first chamber (12) into a calcination chamber and an ash storage chamber. Several ash leakage holes are provided on the ceramic partition (7).

8. The waste heat utilization system for bamboo leaf ash preparation according to claim 7, characterized in that: It also includes a heat exchanger (8), which has a third air inlet (81), a third air outlet (82), a water inlet (83) and a water outlet (84); An air inlet branch pipe (85) is provided at the connection between the first pipe (51) and the second pipe (52), and an air outlet branch pipe (86) is provided at the connection between the second pipe (52) and the third pipe (53). The air inlet branch pipe (85) is connected to the third air inlet (81), and the air outlet branch pipe (86) is connected to the third air outlet (82). A cold water pipe is connected to the inlet (83), and a hot water pipe is connected to the outlet (84).

9. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to claim 8, characterized in that: Pipe B is the fifth pipe (55), one end of the fifth pipe (55) is connected to the collector (4), and the other end of the fifth pipe (55) is connected to the drying tower (3).

10. The waste heat utilization system for flue gas from bamboo leaf ash preparation according to claim 9, characterized in that: The second pipe (52) is provided with a first valve (521), the air inlet branch pipe (85) is provided with a second valve (522), the air outlet branch pipe (86) is provided with a third valve (523), and the fifth pipe (55) is provided with a fourth valve (551).

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