Spray drying apparatus utilizing exhaust gas waste heat

Abstract

The utility model belongs to spray drying equipment technical field discloses a kind of spray drying device using waste heat, including raw material tank, heat exchanger, feed circuit, spray drying assembly, hot air component and separation component;Raw material tank content is equipped with slurry, the first import of heat exchanger is communicated with the outlet of raw material tank by circulating pump, feed circuit is communicated with the first outlet of heat exchanger, first outlet and first import are communicated, the first mouth of spray drying assembly is communicated with feed circuit, hot air component is communicated with the second mouth of spray drying assembly, hot air component provides heating air, separation component inlet is communicated with the outlet of spray drying assembly, separation component exhaust port is communicated with the second import of heat exchanger, the second outlet of heat exchanger can be communicated with air, and second outlet is communicated with second import.The spray drying device using waste heat provided by the utility model avoids waste of waste heat, reduces the redundancy of spray drying device structure, and reduces production cost.

Description

Technical Field

[0001] This utility model relates to the technical field of spray drying equipment, and in particular to a spray drying device that utilizes waste heat from exhaust gas. Background Technology

[0002] Lithium iron phosphate (LFP) materials have high energy density, excellent low-temperature performance, and good safety, and have been applied in fields such as new energy vehicles and energy storage. In the production and research and development process, the mainstream process for preparing LFP is the solid-state method, and the spray drying process is an essential process for preparing LFP precursors. The spray drying process lays the foundation for preparing high-performance LFP cathode materials by precisely controlling the physical structure and chemical composition of the precursor. The traditional process involves directly transferring the LFP precursor to the spray drying process after grinding. This can lead to problems such as high material viscosity, easy changes and blockage, easy adhesion of LFP precursor slurry to the tower wall of the drying tower, and long drying time of LFP precursor, resulting in low production efficiency.

[0003] A spray drying system for producing lithium iron phosphate precursor materials is provided in the related technology. It includes a preheater and an electric heater for heating air, a steam heater for heating steam, a heat exchanger through which heated steam flows, a spray drying tower and a dust collector connected in sequence. The outlet of the electric heater is connected to the inlet of the spray drying tower, the outlet of the heat exchanger is connected to the inlet of the spray drying tower, and the outlet of the dust collector is connected to the inlet of the preheater. The precursor slurry heated by the heat exchanger and the heated air enter the spray drying tower simultaneously for drying. Afterward, the hot air discharged from the outlet of the dust collector is preheated by the preheater and then discharged. However, the air flow path and the setting of multiple heaters lead to structural redundancy in the spray drying system, waste the heat of air and steam, and increase production costs. Utility Model Content

[0004] The purpose of this invention is to provide a spray drying device that utilizes waste heat from exhaust gas. This avoids wasting waste heat, achieves rapid increase in slurry temperature, reduces redundancy in the spray drying device structure, lowers production costs, and improves energy efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A spray drying device utilizing waste heat from exhaust gas includes:

[0007] Raw material tank, containing slurry;

[0008] A heat exchanger, wherein the first inlet of the heat exchanger is connected to the outlet of the raw material tank via a circulating pump;

[0009] A feed circuit, one end of which is connected to the first outlet of the heat exchanger, and the first outlet is connected to the first inlet;

[0010] A spray drying assembly, wherein the first inlet of the spray drying assembly is connected to the other end of the feed circuit;

[0011] A hot air assembly is connected to a second port of the spray drying assembly, and the hot air assembly is capable of providing heated air to the spray drying assembly.

[0012] The separation component has an inlet connected to the outlet of the spray drying component, an exhaust port connected to the second inlet of the heat exchanger, and a second outlet of the heat exchanger that is connected to the air and also connected to the second inlet.

[0013] Preferably, the feeding circuit includes:

[0014] A first feed pipe, one end of which is connected to the first outlet of the heat exchanger;

[0015] The slurry transfer tank has its inlet connected to the other end of the first feed pipe, and its outlet connected to the spray drying assembly via a second feed pipe.

[0016] Preferably, a discharge pump is installed on the second feed pipe.

[0017] Preferably, multiple discharge pumps are provided, and the multiple discharge pumps are connected in parallel, and any one of the discharge pumps can be connected to the second feed pipe.

[0018] Preferably, the separation component includes:

[0019] A separator, the inlet of which is connected to the outlet of the spray drying assembly, and the exhaust port of which is connected to the second inlet of the heat exchanger;

[0020] A discharge component is disposed at the outlet of the separator.

[0021] Preferably, the spray drying assembly includes:

[0022] Atomizer, wherein the inlet of the atomizer is connected to the other end of the feed circuit;

[0023] The spray drying tower has the outlet of the atomizer connected to the spray drying tower and the hot air assembly connected to the inlet of the spray drying tower.

[0024] Preferably, the hot air assembly includes:

[0025] Blower;

[0026] The heating element is connected to the outlet of the blower and the inlet of the heating element via a pipe, and the outlet of the heating element is connected to the second port of the spray drying assembly.

[0027] Preferably, the spray drying device utilizing waste heat from exhaust gas further includes:

[0028] A cleaning tank containing cleaning fluid, the outlet of which is connected to the feed circuit, is used to clean the spray drying assembly.

[0029] Preferably, the spray drying device utilizing waste heat from exhaust gas further includes a filter assembly connected and communicating with the hot air assembly, the filter assembly being able to purify the hot air assembly providing heated air to the spray drying assembly.

[0030] Preferably, the filtering component includes:

[0031] A first filter element is connected to the inlet of the hot air assembly.

[0032] The beneficial effects of this utility model are:

[0033] This utility model provides a spray drying device utilizing waste heat from exhaust gas, including a raw material tank, a heat exchanger, a feeding circuit, a spray drying component, a hot air component, and a separation component. The raw material tank contains slurry. The first inlet of the heat exchanger is connected to the outlet of the raw material tank via a circulating pump. One end of the feeding circuit is connected to the first outlet of the heat exchanger, and the first outlet is connected to the first inlet. The first port of the spray drying component is connected to the other end of the feeding circuit. The hot air component is connected to the second port of the spray drying component and can provide heated air to the spray drying component. The inlet of the separation component is connected to the outlet of the spray drying component, and the exhaust port of the separation component is connected to the second inlet of the heat exchanger. The second outlet of the heat exchanger can be connected to air, and the second outlet is connected to the second inlet.

[0034] The slurry in the raw material tank is pumped into a heat exchanger, where it exchanges heat with the high-temperature exhaust gas from the separation unit. This increases the slurry temperature, reducing energy consumption in the subsequent drying process. The high-temperature exhaust gas, on the other hand, cools down after the heat exchange, with some heat being recovered. The preheated slurry then enters the spray drying unit, where it is atomized into droplets. These droplets mix thoroughly with the heated air supplied by the hot air unit. The water in the droplets evaporates rapidly, forming dried particles. These dried particles, along with the dried heated air, enter the separation unit, where the dried particles are collected and dried. The heated air enters the heat exchanger and is used again to preheat the new slurry, forming a "drying-waste heat recovery-preheating" cycle. This spray drying device, which utilizes the waste heat of the exhaust gas, transfers the heat of the exhaust gas to the slurry through the heat exchanger. It can use the waste heat of the exhaust gas to heat the slurry in a cyclical manner, reducing the energy consumption of the hot air component to heat the fresh air and realizing "waste heat reuse". This not only avoids the waste of waste heat of the exhaust gas and achieves the effect of rapidly increasing the temperature of the slurry, but also reduces the redundancy of the spray drying device structure, lowers production costs, and improves energy efficiency. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a spray drying device utilizing waste heat from exhaust gas provided in an embodiment of this utility model;

[0036] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0037] In the picture:

[0038] 1. Raw material tank; 2. Heat exchanger; 21. First inlet; 22. First outlet; 23. Second inlet; 24. Second outlet;

[0039] 3. Circulating pump; 4. Feed circuit; 41. First feed pipe; 42. Slurry transfer tank; 43. Second feed pipe; 44. Discharge pump;

[0040] 5. Spray drying components; 51. Atomizer; 52. Spray drying tower;

[0041] 6. Hot air assembly; 61. Blower; 62. Heating element;

[0042] 7. Separation assembly; 71. Separation component; 72. Discharge component; 8. Cleaning tank;

[0043] 9. Filter assembly; 91. First filter element; 92. Second filter element. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0045] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0048] This embodiment provides a spray drying device that utilizes waste heat from exhaust gas, such as... Figure 1 and Figure 2As shown, the assembly includes a raw material tank 1, a heat exchanger 2, a feed circuit 4, a spray drying assembly 5, a hot air assembly 6, and a separation assembly 7. The raw material tank 1 contains slurry. The first inlet 21 of the heat exchanger 2 is connected to the outlet of the raw material tank 1 via a circulating pump 3. One end of the feed circuit 4 is connected to the first outlet 22 of the heat exchanger 2. The first outlet 22 is connected to the first inlet 21. The first port of the spray drying assembly 5 is connected to the other end of the feed circuit 4. The hot air assembly 6 is connected to the second port of the spray drying assembly 5 and can provide heated air to the spray drying assembly 5. The inlet of the separation assembly 7 is connected to the outlet of the spray drying assembly 5. The exhaust port of the separation assembly 7 is connected to the second inlet 23 of the heat exchanger 2. The second outlet 24 of the heat exchanger 2 can be connected to air and is connected to the second inlet 23.

[0049] The slurry in raw material tank 1 is pumped into heat exchanger 2 by circulating pump 3, where it exchanges heat with the high-temperature exhaust gas discharged from separation component 7. This increases the slurry temperature, reducing energy consumption in the subsequent drying process. The high-temperature exhaust gas, on the other hand, decreases in temperature after the heat exchange, with some heat being recovered. The preheated slurry then enters spray drying component 5, where it is atomized into droplets. These droplets mix thoroughly with the heated air provided by hot air component 6. The moisture in the droplets evaporates rapidly, forming dried particles. The dried granular slurry, along with the dried heated air, enters separation component 7, where the dried granular slurry particles are collected. The dried heated air enters heat exchanger 2 and is used again to preheat new slurry, forming a "drying-waste heat recovery-preheating" cycle. This spray drying device that utilizes waste heat transfers the heat from the waste gas to the slurry through heat exchanger 2. It can use the waste heat of the waste gas to heat the slurry in a cyclical manner, reducing the energy consumption of the hot air assembly 6 to heat fresh air and realizing "waste heat reuse". This not only avoids the waste of waste heat of the waste gas and achieves the effect of rapidly increasing the temperature of the material, but also reduces the redundancy of the spray drying device structure, reduces production costs, and improves energy efficiency.

[0050] Specifically, such as Figure 1 As shown, in this embodiment, the circulating pump 3 is a diaphragm pump. In other embodiments, the circulating pump 3 may also be a plunger pump or a vane pump, etc. No limitation is made here.

[0051] Optionally, in this embodiment, the heat exchanger 2 is a prior art technology. In this embodiment, any type of heat exchanger 2 in the prior art can be used, and it can be connected to the exhaust port of the separation component 7 using any connection method in the prior art. No specific details are provided.

[0052] Specifically, in this embodiment, the second outlet 24 of the heat exchanger 2 is connected to the air via an induced draft fan. The induced draft fan is designed to draw the exhaust gas that has completed heat exchange with the slurry into the air, ensuring a stable airflow in the spray drying device that utilizes the waste heat of the exhaust gas, and meeting the process requirements for dust removal and drying.

[0053] More specifically, in this embodiment, the heat exchange area of ​​heat exchanger 2 is adjustable. By adjusting the heat exchange area of ​​heat exchanger 2, the flow rate of high-temperature exhaust gas entering heat exchanger 2 can be controlled, thereby precisely adjusting the heat exchange efficiency between high-temperature exhaust gas and slurry to meet the heat exchange requirements under different operating conditions.

[0054] Optionally, such as Figure 1 and Figure 2 As shown, the feed circuit 4 includes a first feed pipe 41, a slurry transfer tank 42, and a second feed pipe 43. One end of the first feed pipe 41 is connected to the first outlet 22 of the heat exchanger 2, the inlet of the slurry transfer tank 42 is connected to the other end of the first feed pipe 41, and the outlet of the slurry transfer tank 42 is connected to the spray drying assembly 5 through the second feed pipe 43. The slurry transfer tank 42 allows for the temporary storage of slurry from the heat exchanger 2, buffering flow fluctuations, reducing downtime caused by material shortages, ensuring stable feeding of the spray drying assembly 5, and improving production efficiency and continuity.

[0055] Further optional, such as Figure 1 As shown, a discharge pump 44 is installed on the second feed pipe 43. When the slurry flows out of the slurry transfer tank 42, if it relies solely on gravity or the natural pressure inside the tank, factors such as high pipeline resistance may result in insufficient flow rate, failing to meet the feeding requirements of the spray drying assembly 5. The discharge pump 44 increases the slurry pressure through mechanical work, ensuring that it enters the subsequent process at a stable flow rate. It should be noted that in this embodiment, the discharge pump 44 is a screw pump. In other embodiments, the discharge pump 44 can also be a vane pump or a plunger pump, etc. There are no limitations here.

[0056] Optionally, such as Figure 1 As shown, multiple discharge pumps 44 are provided, connected in parallel, and any one of the discharge pumps 44 can be connected to the second feed pipe 43. The arrangement of multiple discharge pumps 44 forms a one-in-one-backup structure, allowing other pumps to seamlessly take over operation when one pump fails, preventing system downtime. In this embodiment, two discharge pumps 44 are provided, forming a one-in-one-backup structure. In other embodiments, three or four discharge pumps 44 may be provided, etc. No limitation is made here.

[0057] Specifically, such as Figure 1 As shown, in this embodiment, the slurry transfer tank 42 is equipped with a level detector to detect the slurry level inside the slurry transfer tank 42. This helps ensure a stable slurry level in the slurry transfer tank 42, preventing overflow due to excessively high levels or affecting the supply of materials to subsequent processes due to excessively low levels.

[0058] It should be noted that the liquid level detector is existing technology, and setting a liquid level detector in the slurry transfer tank 42 is a conventional setting in the art. In this embodiment, any liquid level detector in the prior art can be used, and any connection method in the prior art can be used to detect the slurry liquid level in the slurry transfer tank 42. No specific details will be provided.

[0059] Optionally, such as Figure 1 As shown, the separation assembly 7 includes a separator 71 and a discharge assembly 72. The inlet of the separator 71 is connected to the outlet of the spray drying assembly 5, and the exhaust port of the separator 71 is connected to the second inlet 23 of the heat exchanger 2. The discharge assembly 72 is located at the outlet of the separator 71. The separator 71 and the discharge assembly 72 form a separation-discharge relationship. The spray-dried slurry particles and the high-temperature exhaust gas enter the separator 71 through the inlet. After separating the high-temperature exhaust gas, the separator 71 delivers it to the heat exchanger 2 through the exhaust port and discharges the separated dried slurry particles into the discharge assembly 72. The dried slurry particles then enter the next process through the discharge assembly 72.

[0060] Specifically, in this embodiment, the separator 71 is a bag filter. In other embodiments, the separator 71 can also be a cyclone separator, etc. No limitation is made here. Specifically, in this embodiment, the discharge component 72 is a rotary valve. In other embodiments, the discharge component 72 can also be other types of dischargers. No limitation is made here.

[0061] Optionally, such as Figure 1 As shown, the spray drying assembly 5 includes an atomizer 51 and a spray drying tower 52. The inlet of the atomizer 51 is connected to the other end of the feed circuit 4, and the outlet of the atomizer 51 is connected to the spray drying tower 52. The hot air assembly 6 is connected to the inlet of the spray drying tower 52. The other end of the feed circuit 4 delivers the slurry to the atomizer 51, which atomizes the slurry into fine droplets. These droplets disperse inside the spray drying tower 52 and mix with the heated air input by the hot air assembly 6. The droplets evaporate moisture to form dried particles. The atomizer 51 ensures that the slurry is evenly dispersed in the hot air, improving drying efficiency and product quality. It should be noted that in this embodiment, the second feed pipe 43 is connected to the atomizer 51.

[0062] It should be noted that the atomizer 51 and spray drying tower 52 are existing structures. Setting the atomizer 51 and spray drying tower 52 in the spray drying device is a conventional setting in the art. In this embodiment, any atomizer 51 and any spray drying tower 52 in the prior art can be used, and any connection method in the prior art can be used to atomize and dry the slurry. As long as the atomization and drying of the slurry is achieved, no specific description will be given.

[0063] Optionally, such as Figure 1As shown, the hot air assembly 6 includes a blower 61 and a heating element 62. The outlet of the blower 61 is connected to the inlet of the heating element 62 via a pipe, and the outlet of the heating element 62 is connected to the second port of the spray drying assembly 5. The blower 61 serves as the airflow power source, and its outlet is connected to the inlet of the heating element 62 via a pipe, forming the basic flow from air supply to heating. The blower 61 is responsible for delivering outside air to ensure sufficient airflow. The outlet of the heating element 62 is connected to the inlet of the spray drying tower 52. The heated high-temperature airflow enters the spray drying tower 52 through the second port and comes into contact with the droplet-shaped slurry formed by the atomizer 51, achieving heat exchange drying. This optimizes the morphology and structure of the slurry particles, promotes rapid surface curing, and forms a dense outer shell.

[0064] Specifically, in this embodiment, the heating element 62 is a hot air furnace. In other embodiments, the heating element 62 may also be a heating wire, etc. The key is to achieve the heating of air.

[0065] Specifically, in this embodiment, the blower 61 is a centrifugal blower. In other embodiments, the blower 61 may also be a pressurizing blower, etc. No limitation is made here.

[0066] Optionally, such as Figure 1 As shown, the spray drying device utilizing waste heat from exhaust gas also includes a cleaning tank 8, which contains cleaning fluid. The outlet of the cleaning tank 8 can be connected to the feed circuit 4 for cleaning the spray drying assembly 5. The cleaning fluid flows between the spray drying assembly 5 and the feed circuit 4 using a discharge pump 44. The cleaning fluid flushes away residual materials inside. The cleaning fluid is atomized into droplets by the atomizer 51, which clean the deposits on the inner wall of the spray drying tower 52 and the surfaces of other components. After cleaning, the discharge port 72 is opened to discharge the waste liquid containing residue outside the device. This increases the contact area between the cleaning fluid and the components, thereby improving the cleaning effect and preventing the previous batch of slurry from affecting the quality of the next batch. It should be noted that in this embodiment, the cleaning fluid is pure water. Pure water contains no impurities, avoiding any impact on the slurry quality, and it contains no minerals, so no watermarks will be left after drying. In other embodiments, the cleaning fluid can also be clean water, etc. No limitations are imposed here.

[0067] Optionally, such as Figure 1 As shown, the spray drying device utilizing waste heat from exhaust gas also includes a filter assembly 9. The filter assembly 9 is connected and communicates with the hot air assembly 6. The filter assembly 9 can purify the heated air supplied by the hot air assembly 6 to the spray drying assembly 5. The filter assembly 9 avoids the influence of air pollutants on the quality of the slurry and ensures the cleanliness of the hot air during the drying process.

[0068] Further optional, such as Figure 1As shown, in this embodiment, the filter assembly 9 includes a first filter element 91, which is connected to the inlet of the hot air assembly 6. The first filter element 91 can initially filter the air entering the blower 61, preventing hard impurities in the air from affecting the normal air supply of the blower 61.

[0069] Specifically, in this embodiment, the first filter element 91 is an activated carbon filter. In other embodiments, the first filter element 91 can also be a synthetic fiber bag filter, a non-woven fabric filter, or a nylon mesh filter, etc. There are no limitations here; any filter capable of performing primary and secondary filtration on the air entering the blower 61 is acceptable.

[0070] Further optional, such as Figure 1 As shown, in this embodiment, the filter assembly 9 includes a second filter element 92, which is disposed between the blower 61 and the heating element 62 and is in communication with both. The second filter element 92 further filters the air output from the outlet of the blower 61 before it enters the spray drying tower 52, further avoiding any impact on the quality of the slurry and further ensuring the cleanliness of the hot air.

[0071] Specifically, in this embodiment, the second filter element 92 is an ultra-fine glass fiber V-type filter. In other embodiments, the second filter element 92 can also be a high-efficiency glass fiber filter paper filter, etc. There are no limitations here, as long as it can achieve efficient filtration of the air entering the heating element 62.

[0072] It should be noted that the first filter element 91 and the second filter element 92 are existing technologies, and the existing technologies clearly describe the classification of pre-filters, medium-efficiency filters and high-efficiency filters, which will not be repeated here.

[0073] Optionally, in this embodiment, the raw material tank 1, circulating pump 3, heat exchanger 2, first feed pipe 41, slurry transition tank 42, second feed pipe 43, discharge pump 44, and atomizer 51 are all connected by pipes; the first filter element 91, blower 61, second filter element 92, heating element 62, and spray drying tower 52 are connected by pipes; the spray drying tower 52, separator 71, heat exchanger 2, and induced draft fan are connected by pipes; and the cleaning tank and first feed pipe 41 are connected by pipes. It should be noted that the pipes are existing technology, and any type of pipe from the existing technology can be used in this embodiment as long as it can achieve the connection of the above structures and meets the spray drying process requirements; no limitation is imposed here.

[0074] Optionally, in this embodiment, temperature sensors are provided between the second filter element 92 and the heating element 62, between the separating element 71 and the heat exchange element 2, between the heat exchange element 2 and the induced draft fan, and in the slurry transfer tank 42, for temperature detection. It should be noted that the temperature sensor is prior art, and any type of prior art temperature sensor can be used in this embodiment. Further details are omitted here.

[0075] Optionally, in this embodiment, pressure sensors are provided on both the spray drying tower 52 and the separator 71. These sensors are used to detect the pressure of the slurry and heating air inside the spray drying tower 52, as well as the pressure at the exhaust port of the separator 71. It should be noted that the pressure sensor is prior art, and any type of pressure sensor in the prior art can be used in this embodiment. Further details are omitted here.

[0076] Optionally, in this embodiment, a regulating valve is provided at the exhaust port of the separator 71 to adjust the flow rate at the exhaust port.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A spray drying device utilizing waste heat from exhaust gas, characterized in that, include: Raw material tank (1), the contents of which are slurry; The heat exchanger (2) has its first inlet (21) connected to the outlet of the raw material tank (1) via a circulating pump (3); Feed circuit (4), one end of which is connected to the first outlet (22) of the heat exchanger (2), and the first outlet (22) and the first inlet (21) are connected; The spray drying assembly (5) has its first port connected to the other end of the feed circuit (4); A hot air assembly (6) is connected to the second port of the spray drying assembly (5), and the hot air assembly (6) is capable of providing heated air to the spray drying assembly (5); The separation component (7) has an inlet connected to the outlet of the spray drying component (5), an exhaust port of the separation component (7) connected to the second inlet (23) of the heat exchanger (2), and a second outlet (24) of the heat exchanger (2) connected to the air, and the second outlet (24) connected to the second inlet (23).

2. The spray drying device utilizing waste heat from exhaust gas according to claim 1, characterized in that, The feed circuit (4) includes: The first feed pipe (41) is connected at one end to the first outlet (22) of the heat exchanger (2); The slurry transfer tank (42) has its inlet connected to the other end of the first feed pipe (41), and its outlet is connected to the spray drying assembly (5) through the second feed pipe (43).

3. The spray drying device utilizing waste heat from exhaust gas according to claim 2, characterized in that, A discharge pump (44) is installed on the second feed pipe (43).

4. The spray drying device utilizing waste heat from exhaust gas according to claim 3, characterized in that, Multiple discharge pumps (44) are provided, and the multiple discharge pumps (44) are connected in parallel. Any one of the discharge pumps (44) can be connected to the second feed pipe (43).

5. The spray drying device utilizing waste heat from exhaust gas according to claim 1, characterized in that, The separation component (7) includes: The separator (71) has an inlet connected to the outlet of the spray drying assembly (5) and an exhaust port connected to the second inlet (23) of the heat exchanger (2). Discharge member (72) is disposed at the outlet of the separator (71).

6. The spray drying device utilizing waste heat from exhaust gas according to claim 1, characterized in that, The spray drying assembly (5) includes: Atomizer (51), the inlet of which is connected to the other end of the feed circuit (4); The spray drying tower (52) is connected to the outlet of the atomizer (51) and the hot air assembly (6) is connected to the inlet of the spray drying tower (52).

7. The spray drying device utilizing waste heat from exhaust gas according to claim 1, characterized in that, The hot air assembly (6) includes: Blower (61); The outlet of the blower (61) and the inlet of the heating element (62) are connected by a pipe, and the outlet of the heating element (62) is connected to the second port of the spray drying assembly (5).

8. The spray drying apparatus utilizing waste heat from exhaust gas according to any one of claims 1-7, characterized in that, The spray drying device utilizing waste heat from exhaust gas also includes: A cleaning tank (8) is provided, which contains cleaning liquid. The outlet of the cleaning tank (8) is connected to the feed circuit (4) for cleaning the spray drying assembly (5).

9. The spray drying apparatus utilizing waste heat from exhaust gas according to any one of claims 1-7, characterized in that, The spray drying device utilizing waste heat from exhaust gas also includes a filter assembly (9), which is connected and communicates with the hot air assembly (6). The filter assembly (9) can purify the hot air supplied by the hot air assembly (6) to the spray drying assembly (5).

10. The spray drying apparatus utilizing waste heat from exhaust gas according to claim 9, characterized in that, The filter component (9) includes: The first filter element (91) is connected to the inlet of the hot air assembly (6).

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