A combined spray drying system

Abstract

This utility model relates to the field of dye deep processing and synthesis in the chemical industry, specifically a combined spray drying system. It includes: a dye raw material feeding system for supplying slurry; a spray tower connected to the dye raw material feeding system, equipped with multiple spray guns, each individually controlled; a natural gas hot air furnace connected to the spray tower for providing high-temperature flue gas; a processing exhaust gas treatment system connected to the spray tower and the natural gas hot air furnace for treating the discharged exhaust gas; and a storage silo connected to the bottom of the spray tower and to a small bag filter, which is connected to the processing exhaust gas treatment system via a collecting fan. The slurry, after being atomized by the spray guns in the spray tower, directly contacts the high-temperature flue gas for drying.

Description

Technical Field

[0001] This utility model relates to the field of dye deep processing and synthesis in the chemical industry, specifically a combined spray drying system. Background Technology

[0002] Traditional dye production processes generate large amounts of sulfur-containing wastewater and exhaust gases, causing serious pollution to the ecological environment. To improve the traditional production model of the chemical industry and reduce air pollution, spray drying systems are commonly used in the construction of new chemical plants. Spray drying systems can convert liquid substances into solid powders and can achieve drying even at relatively low temperatures, making them particularly suitable for processing dyes that are easily decomposed or deteriorated at high temperatures. Spray drying equipment used in chemical production processes typically achieves rapid drying by atomizing the produced liquid and then exposing it to hot air. Its core principle is to use atomization decomposition and heat-mass exchange to dry the material. The overall workflow is atomization → heat exchange → separation, achieving moisture removal in a very short time.

[0003] Patent CN119334181A discloses a spray drying exhaust heat recycling device, comprising a first heat exchange system, a bag filter dust collection system, a dust recovery system, and a spray drying system. The dust recovery system includes a water tank connected to the flue gas outlet of the first heat exchange system and a water tank connected to the water tank. This device achieves efficient resource recovery from the exhaust gas. A second heat exchanger and a third heat exchanger are respectively installed at the flue gas outlet and fresh air inlet of the first heat exchange system, and the second heat exchanger is connected to the third heat exchanger. The third heat exchanger is connected to the dust recovery system. This multi-stage heat exchange method achieves efficient heat recovery from the exhaust gas while significantly reducing the fuel required for the entire system. This application facilitates the efficient recovery and recycling of resources from exhaust gas, effectively preventing the problem of insufficient utilization of exhaust gas resources and reducing production costs.

[0004] Patent CN119524441A discloses a spray drying system, including a spray drying unit and a heat pump unit. The spray drying unit includes at least a drying device, a feeding pipeline, a gas supply pipeline, and an exhaust pipeline. The gas supply pipeline supplies heat source gas to the drying device, and the exhaust pipeline discharges the gas from the drying device. The heat pump unit includes at least a compressor, an evaporator, and a condenser. The evaporator provides a heat exchange medium for heat exchange with the gas in the exhaust pipeline, and the condenser provides a heat exchange medium for heat exchange with the gas supply pipeline. This configuration allows the heat exchange medium of the heat pump unit to recover heat from the gas in the exhaust pipeline, avoiding waste of heat resources. The compressor increases the enthalpy of the heat exchange medium, effectively increasing its temperature. This heat exchange between the heat exchange medium of the heat pump unit and the gas in the gas supply pipeline heats the gas, effectively increasing its temperature, reducing the need for a heater, and lowering energy consumption.

[0005] Patent CN119334181A primarily focuses on the efficient utilization of exhaust gases, while patent CN119524441A addresses the issues of high energy consumption and wasted heat resources in spray drying systems. Traditionally, chemical waste gas treatment involves a primary cyclone dust collector, a secondary bag filter, and an alkaline spray tower. By rationally combining these three types of equipment, integrated treatment of chemical waste gas—dust removal, recovery, and purification—can be achieved, simultaneously meeting environmental protection requirements and material recovery efficiency. The published patents mainly use natural gas furnaces or heat pump units. Natural gas furnaces, as a common heat source, have advantages such as high calorific value and relatively controllable cost, but they also have high safety risks, high nitrogen oxide emissions, unburned VOCs, limited thermal efficiency and energy waste, and poor operation, maintenance and process adaptability. Electric heating to heat the air has high energy consumption and a large amount of heat resources are wasted. The drying spray system using heat pumps has advantages such as high efficiency and energy saving, low operating cost, no combustion pollution, low carbon emissions, low temperature drying of 40-120℃, and stepless temperature adjustment, but the maximum temperature is limited (≤120℃), the initial investment cost is high (equipment cost is 30% to 50% higher), the efficiency decreases in low temperature environments (when the ambient temperature is <0℃, the evaporator is prone to condensation and requires regular defrosting), the system is complex and the maintenance cost is high. It is only suitable for processing capacity >500Kg / h, the heat pump equipment is bulky, and it is not suitable for high temperature and high dust environments.

[0006] Therefore, considering the shortcomings of the above technologies, how to combine the spray drying and exhaust gas treatment equipment of chemical dye production enterprises, rationally match the systems, and design the internal structure of the tanks to meet the national requirements for pollutant emissions from chemical enterprises is an important technical problem that those skilled in the art need to solve. Summary of the Invention

[0007] To address the problems of poor adaptability, large investment scale, and high pollutant emissions in related technologies, this utility model provides a combined spray drying system.

[0008] This utility model adopts the following technical solution: a combined spray drying system, comprising:

[0009] A dye raw material feeding system for supplying slurry;

[0010] The spray tower is connected to the dye raw material feeding system. The spray tower is equipped with multiple spray guns, each of which is controlled independently.

[0011] A natural gas hot air furnace, connected to a spray tower, is used to provide high-temperature flue gas;

[0012] A processing exhaust gas treatment and ventilation system is provided, which is connected to the spray tower and the natural gas hot air furnace for treating the discharged exhaust gas.

[0013] The storage silo is connected to the bottom of the spray tower and to a small bag filter dust collector. The small bag filter dust collector is connected to the exhaust gas treatment system through a material collection fan.

[0014] After being atomized by the spray gun of the spray tower, the slurry comes into direct contact with the high-temperature flue gas to dry.

[0015] In some embodiments, the dye raw material feeding system includes:

[0016] The slurry storage tank is connected to the spray tower in sequence through a multi-stage filter, a high-pressure pump, and a slurry buffer tank.

[0017] In some embodiments, the processing exhaust gas treatment system includes:

[0018] The dust removal system includes a primary cyclone dust collector and a secondary bag filter connected in parallel;

[0019] The spray system includes a series of primary water washing spray towers, secondary alkaline washing spray towers, tertiary alkaline washing spray towers, quaternary acid washing spray towers, quinary acid washing spray towers, and sixth-stage water washing spray towers.

[0020] The exhaust gas emission tower, spray system and dust removal system are connected in series with the exhaust gas emission tower.

[0021] In some embodiments, it also includes:

[0022] The induced draft fan unit is connected to the secondary bag filter.

[0023] In some embodiments, the primary water washing spray tower, the secondary alkaline washing spray tower, the tertiary alkaline washing spray tower, and the quaternary acid washing spray tower are connected to a circulating liquid pump, and adjacent primary water washing spray towers, secondary alkaline washing spray towers, tertiary alkaline washing spray towers, quaternary acid washing spray towers, quinary acid washing spray towers, and quaternary water washing spray towers are interconnected through spray pumps.

[0024] In some embodiments, the natural gas hot air furnace is connected to a heat exchanger, which is in turn connected to a heat exchange blower and an induced draft fan unit.

[0025] In some embodiments, the primary water washing spray tower, the secondary alkaline washing spray tower, the tertiary alkaline washing spray tower, the quaternary acid washing spray tower, the quinary acid washing spray tower, and the sixth water washing spray tower have the same structure, including a spray tower, with an umbrella-shaped support frame at the top of the spray tower, and multiple spray pipes on the umbrella-shaped support frame for spraying.

[0026] In some embodiments, the main spray tower is arranged in an inverted cone shape;

[0027] A cyclone separator is installed at the outlet of the spray tower to separate materials;

[0028] A conical hopper and valves are installed at the bottom of the spray tower to increase the airtightness of the system;

[0029] A vibration device is installed at the bottom of the spray tower to ensure that the material entering the tower can be smoothly discharged.

[0030] The feed inlet of the spray tower is equipped with a feed vibration device to ensure that the feed liquid is fully mixed with the hot air.

[0031] In some embodiments, the small bag filter is also connected to a heat exchanger via a collection fan.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] This invention significantly improves the efficiency and continuous operational reliability of the drying process through multiple synergistic designs. The use of a natural gas hot air furnace combined with a heat exchange blower and a low-NOx burner ensures a stable and uniform supply of high-temperature flue gas, guaranteeing full contact between the atomized slurry and the hot air for rapid drying. The intelligent independent spray gun control, smooth tower wall design, and bottom vibration device of the spray tower effectively prevent material blockage, clumping, or accumulation, ensuring smooth transport and separation of the dry powder. The multi-stage filtration system and high-pressure pump stabilization design eliminate the risk of large particulate impurities clogging the spray guns at the source, maintaining the stability and continuity of slurry transport. These measures collectively achieve efficient, long-term stable operation of the system, significantly reducing downtime maintenance frequency and significantly improving the uniformity and moisture content control accuracy of the finished dye powder.

[0034] A multi-stage collaborative exhaust gas treatment and heat recovery system was constructed, achieving both environmental friendliness and efficient resource utilization. Through a two-stage dust removal process using a cyclone separator and a membrane-coated bag filter, and a six-stage stepped spray purification system (water washing-alkali washing-acid washing-water washing), dust, acidic gases (such as H2S), alkaline gases (such as ammonia), and residual pollutants in the exhaust gas are specifically removed, ensuring that the final emissions meet stringent environmental standards. Particularly noteworthy is the innovative use of a plate heat exchanger to recover waste heat from the exhaust gas at the outlet of the small bag filter, preheating the cold air and using it as combustion air for the natural gas hot air furnace, significantly reducing natural gas consumption. Simultaneously, the fully enclosed material conveying system and the dust explosion-proof design of the bag filter further eliminate safety and environmental risks during production. The entire system achieves green and low-carbon operation through energy efficiency optimization and tiered pollution control. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of a combined spray drying system;

[0036] Figure 2Schematic diagram I of the internal structure of the spray tower;

[0037] Figure 3 Schematic diagram II of the internal structure of the spray tower;

[0038] In the diagram: 1. Slurry storage tank; 2. Multi-stage filter; 3. Slurry buffer tank; 4. High-pressure pump; 5. Main spray tower; 6. Natural gas hot air furnace; 7. Primary cyclone dust collector; 8. Secondary bag filter; 9. Exhaust fan unit; 10. Heat exchange blower; 11. Storage silo; 12. Small bag filter; 13. Material collection fan; 14. Primary water washing spray; 15. Secondary alkaline washing spray; 16. Tertiary alkaline washing spray; 17. Quaternary acid washing spray; 18. Fifth-stage acid washing spray; 19. Sixth-stage water washing spray; 20. Tail gas emission tower; 21. Spray pump; 22. Circulating liquid pump; 23. Spray tower; 24. Umbrella-shaped support frame; 25. Spray pipe. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] like Figure 1 As shown, a combined spray drying system includes:

[0041] A dye raw material feeding system for supplying slurry;

[0042] The spray tower 5 is connected to the dye raw material feeding system. The spray tower 5 is equipped with multiple spray guns, each of which is controlled independently.

[0043] Natural gas hot air furnace 6, which is connected to spray main tower 5, is used to provide high-temperature flue gas;

[0044] A processing exhaust gas treatment and ventilation system is provided, which is connected to the spray tower 5 and the natural gas hot air furnace 6 for treating the discharged exhaust gas.

[0045] The storage bin 11 is connected to the bottom of the spray tower 5 and to a small bag filter 12. The small bag filter 12 is connected to the processing exhaust gas treatment system through the receiving fan 13.

[0046] After being atomized by the spray gun 5 of the spray tower, the slurry comes into direct contact with the high-temperature flue gas to dry.

[0047] Specifically, the main spray tower 5 is equipped with multiple intelligent spray guns, each equipped with a feed pipe, spray gun tube, nozzle, and control valve. Each spray gun can be controlled independently. The interior of the main spray tower 5, which comes into contact with the feed material, has a smooth plate surface. The main spray tower 5 is constructed by bending steel plates into a circle and then welding them together. Reinforcing components, made of steel plate strips, are installed on the outer side of the tower body.

[0048] The main spray tower 5 is arranged in an inverted cone shape; a cyclone separator is installed at the outlet of the main spray tower 5 for material separation; a conical hopper and valve are installed at the bottom of the main spray tower 5 to increase the airtightness of the system; a vibration device is installed at the bottom of the main spray tower 5 to ensure that the material entering the tower can be smoothly discharged; a feed vibration device is installed at the feed inlet of the main spray tower 5 to ensure that the feed liquid and hot air are fully mixed. The large conical smooth surface ensures that the slurry does not adhere to the wall during atomization, preventing material agglomeration.

[0049] The dye raw material feeding system includes:

[0050] The slurry storage tank 1 is connected to the spray tower 5 in sequence through a multi-stage filter 2, a high-pressure pump 4, and a slurry buffer tank 3.

[0051] Specifically, the slurry storage tank 1, multi-stage filter 2, high-pressure pump 4, slurry buffer tank 3, and spray tower 5 are connected by connecting pipes, which consist of an electrically heated feed pipe, valves, flanges, and other components. The multi-stage filter 2 is made of 304 stainless steel with a filtration accuracy of 40-80 mesh to prevent large slurry particles from clogging the spray gun. The slurry after passing through the multi-stage filter 2 is transported to the top of the spray tower 5 by the high-pressure pump 4. The high-pressure pump 4 uses frequency conversion technology and meets explosion-proof requirements. A pressure-stabilizing slurry buffer tank is installed at the outlet of the high-pressure pump 4, and a high-pressure ball valve is installed on the connected pressure-stabilizing pipe for backflow. To ensure normal operation in winter, the feed pipe is externally wrapped with electric heat tracing.

[0052] The exhaust gas treatment system includes:

[0053] The dust removal system includes a parallel primary cyclone dust collector 7 and a secondary bag filter 8;

[0054] The spray system includes a series of primary water washing spray tower 14, secondary alkaline washing spray tower 15, tertiary alkaline washing spray tower 16, quaternary acid washing spray tower 17, quinary acid washing spray tower 18, and sixth-stage water washing spray tower 19.

[0055] The exhaust gas emission tower 20, the spray system and the dust removal system are connected in series with the exhaust gas emission tower 20.

[0056] Specifically, the primary cyclone dust collector 7 consists of two units connected in parallel, with a smooth inner surface and an automatic control valve at the bottom. The secondary bag filter 8 is a conical bag filter with a support perforated plate inside the filter bag; the perforations must be smooth. The secondary bag filter 8 uses multiple filter bags made of polyester-coated fleece, and is equipped with a wire mesh cage. The secondary bag filter 8 has an independent air duct equipped with an electromagnetic pulse valve. The secondary bag filter 8 has a cleaning system with sufficient air storage and a cylinder valve. The lower cone of the secondary bag filter 8 is equipped with a vibration device. The secondary bag filter 8 uses high-compressed air for cleaning. The dust collector has a maintenance door on its side wall that allows personnel access.

[0057] It also includes an induced draft fan unit 9, which is connected to a secondary bag filter 8.

[0058] An induced draft fan unit 9 is installed outside the secondary bag filter 8, using a dust explosion-proof motor and a frequency converter for airflow regulation. The fan is a side-adsorption type. Rubber vibration isolators are installed under the foundation of the induced draft fan unit 9. A drain outlet is installed at the bottom of the induced draft fan unit 9, and the wastewater is discharged into a nearby sewage well or sewage tank.

[0059] The primary water washing spray tower 14, the secondary alkaline washing spray tower 15, the tertiary alkaline washing spray tower 16, and the quaternary acid washing spray tower 17 are connected to a circulating liquid pump 22. Adjacent primary water washing spray towers 14, 2nd-stage alkaline washing spray towers 15, 3rd-stage alkaline washing spray towers 16, 4th-stage acid washing spray towers 17, 5th-stage acid washing spray towers 18, and 6th-stage water washing spray towers 19 are interconnected through spray pumps 21.

[0060] The primary water washing spray tower 14, the secondary alkaline washing spray tower 15, the tertiary alkaline washing spray tower 16, the quaternary acid washing spray tower 17, the quinary acid washing spray tower 18, and the sixth-stage water washing spray tower 19 have the same structure, including a spray tower 23. The top of the spray tower 23 is equipped with an umbrella-shaped support frame 24, and multiple spray pipes 25 are installed on the umbrella-shaped support frame 24 for spraying.

[0061] Specifically, the exhaust gas from the dye treatment process needs to pass through a primary water washing spray tower 14, a secondary alkaline washing spray tower 15, a tertiary alkaline washing spray tower 16, a quaternary acid washing spray tower 17, a quinary acid washing spray tower 18, and a sixth-stage water washing spray tower 19 to remove pollutants from the exhaust gas. The spray towers are made of fiberglass and are equipped with nozzles, circulating liquid pumps, fiberglass conveying pipes, and exhaust gas emission towers. An umbrella-shaped support frame, composed of multiple blades of different dimensions, is installed inside the spray tower, and the spray pipes are fixed on the umbrella-shaped support frame.

[0062] The natural gas hot air furnace 6 is connected to the heat exchange blower 10, and the natural gas hot air furnace 6 is equipped with a low-NOx burner to assist the heat exchange blower 10.

[0063] The natural gas hot air furnace 6 is equipped with a low-NOx burner and an auxiliary fan. The heat exchange blower 10 adopts frequency conversion control and is equipped with a dust explosion-proof motor. A gas filter device is installed on the side of the natural gas hot air furnace 6.

[0064] An aluminum silicate insulation layer is installed on the outside of the equipment system, with the appropriate thickness of insulation material selected according to different equipment functions. For the ductwork and other piping systems, the filtration unit uses fiberglass ductwork, while the rest uses 304 stainless steel.

[0065] The slurry, after passing through a multi-stage filter 2, enters the inlet of the high-pressure pump 4. Pressurized by the pump and then stabilized by a slurry buffer tank, it is then transported to the top of the spray tower 5. The spray tower 5 is equipped with a natural gas hot air furnace, using natural gas as a heat source to heat the drying process. The high-temperature flue gas generated by the furnace provides heat to the spray tower. A hot air distribution system is installed at the top of the spray tower 5, ensuring the high-temperature flue gas from the furnace is evenly distributed into the tower. Multiple intelligent spray guns are installed at the top of the tower 5, allowing the slurry to be atomized and directly contact the high-temperature flue gas for drying. Temperature and pressure sensors are installed at both the inlet and outlet of the spray tower 5 to monitor its operation in real time. After drying in the spray tower 5, the slurry moisture content drops to below 5%. To prevent material accumulation at the bottom cone of the spray tower 5, a vibration device is installed at the lower cone to prevent material buildup. After being spray-dried, the high-temperature flue gas temperature decreases. After gas-solid separation at the bottom of the spray tower 5, it is discharged from the bottom of the spray tower 5 and enters the first-stage cyclone dust collector 7. After the first-stage cyclone dust collector 7 initially captures the dry material carried by the flue gas, it enters the second-stage bag filter 8 for further collection of dry material.

[0066] The bottom of the spray tower 5 is connected to a storage silo 11. The pneumatic power for the storage silo 11 comes from the receiving fan 13, and the conveying air is air that has been refrigerated and dehumidified by a refrigerated dryer. The materials at the bottom of the spray tower 5, the primary cyclone dust collector 7, and the secondary bag filter 8 all enter the storage silo 11 and are conveyed to the finished product silo by air power. A small bag filter 12 is installed on the top of the finished product silo to separate the conveying air from the materials. The materials enter the silo for temporary storage, while the conveying air is discharged by the suction fan and enters the primary water washing spray 14.

[0067] The exhaust gas from the outlet of the small bag filter 12 first enters the heat exchanger, which adopts a plate heat exchanger and has two independent exhaust gas channels inside. It mainly utilizes gas-to-gas heat exchange, and the ambient air is drawn in by a blower to exchange heat with the dried exhaust gas. After the ambient air temperature rises after heat exchange, it is sent to the natural gas hot air furnace 6 as combustion air, which saves energy, increases efficiency, and reduces natural gas consumption.

[0068] The exhaust gas from the small bag filter 12 enters the cyclone spray tower. The spray tower has six stages of spraying. The first stage is a water wash, mainly used to remove dust from the exhaust gas. The second and third stages use alkaline washing, adding sodium hydroxide to absorb H2S gas from the exhaust gas. The fourth and fifth stages use acid washing, adding sulfuric acid to absorb ammonia gas from the exhaust gas. The sixth stage is a water wash, mainly used to scrub the exhaust gas after acid and alkaline washing. A circulating spray pump is installed at the bottom of each spray tower. After being scrubbed, the flue gas is discharged into the air through the exhaust pipe.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A combined spray drying system, characterized in that, include: A dye raw material feeding system for supplying slurry; The spray tower (5) is connected to the dye raw material feeding system. The spray tower (5) is equipped with multiple spray guns, each of which is controlled individually. Natural gas hot air furnace (6), which is connected to the spray tower (5) and is used to provide high-temperature flue gas; Processing exhaust gas treatment and ventilation system, wherein the processing exhaust gas treatment and ventilation system is connected to the spray main tower (5) and the natural gas hot air furnace (6) for treating the discharged exhaust gas; The storage bin (11) is connected to the bottom of the spray tower (5) and to a small bag filter (12). The small bag filter (12) is connected to the exhaust system for processing exhaust gas through a receiving fan (13). After the slurry is atomized by the spray gun of the spray tower (5), it comes into direct contact with the high-temperature flue gas to dry.

2. The combined spray drying system according to claim 1, characterized in that, The dye raw material feeding system includes: The slurry storage tank (1) is connected to the spray tower (5) in sequence through a multi-stage filter (2), a high-pressure pump (4) and a slurry buffer tank (3).

3. The combined spray drying system according to claim 1, characterized in that, The processing exhaust gas treatment system includes: The dust removal system includes a primary cyclone dust collector (7) and a secondary bag filter (8) connected in parallel. The spray system includes a series of primary water washing spray tower (14), secondary alkaline washing spray tower (15), tertiary alkaline washing spray tower (16), quaternary acid washing spray tower (17), quinary acid washing spray tower (18) and sixth-stage water washing spray tower (19). The exhaust gas emission tower (20) is connected in series with the spray system and the dust removal system.

4. The combined spray drying system according to claim 3, characterized in that, Also includes: The induced draft fan unit (9) is connected to the secondary bag filter (8).

5. The combined spray drying system according to claim 3, characterized in that, The primary water washing spray tower (14), the secondary alkaline washing spray tower (15), the tertiary alkaline washing spray tower (16), and the quaternary acid washing spray tower (17) are connected to a circulating liquid pump (22). Adjacent primary water washing spray towers (14), secondary alkaline washing spray towers (15), tertiary alkaline washing spray towers (16), quaternary acid washing spray towers (17), quinary acid washing spray towers (18), and quaternary water washing spray towers (19) are interconnected through a spray pump (21).

6. The combined spray drying system according to claim 4, characterized in that, The natural gas hot air furnace (6) is connected to a heat exchanger, which is connected to a heat exchange blower (10) and an induced draft fan unit (9).

7. The combined spray drying system according to claim 3, characterized in that, The first-stage water washing spray tower (14), the second-stage alkaline washing spray tower (15), the third-stage alkaline washing spray tower (16), the fourth-stage acid washing spray tower (17), the fifth-stage acid washing spray tower (18), and the sixth-stage water washing spray tower (19) have the same structure, including a spray tower (23). The top of the spray tower (23) is provided with an umbrella-shaped support frame (24), and multiple spray pipes (25) are provided on the umbrella-shaped support frame (24) for spraying.

8. The combined spray drying system according to claim 1, characterized in that, The main spray tower (5) is arranged in an inverted cone shape; A cyclone separator is installed at the outlet of the spray tower (5) to separate materials; A conical hopper and valve are installed at the bottom of the spray tower (5) to increase the airtightness of the system; A vibration device is installed at the bottom of the spray tower (5) to ensure that the material entering the tower can be delivered smoothly. A feeding vibration device is installed at the feed inlet of the spray tower (5) to ensure that the feed liquid is fully mixed with the hot air.

9. The combined spray drying system according to claim 1, characterized in that, The small bag filter (12) is also connected to a heat exchanger via a material collection fan (13).

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