A multi-stage temperature-controlled spray dryer
By designing a multi-stage temperature control system and diffuser, the problem of inaccurate temperature control in spray dryers has been solved, achieving protection of heat-sensitive materials and improvement of product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAN DONG ZHONG SHI YAO YE YOU XIAN GONG SI
- Filing Date
- 2025-07-18
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional spray dryers have inaccurate temperature control during the drying process, which makes heat-sensitive materials susceptible to thermal degradation and affects product quality.
A multi-stage temperature control system is adopted, including a primary temperature control module, a secondary temperature control module, and a tertiary temperature control module, to precisely regulate the inlet temperature of hot air, the temperature inside the drying tower, and the outlet temperature. A diffuser is installed inside the drying tower to increase the contact area between the material and the steam.
It achieves precise temperature control in the spray drying process, protecting heat-sensitive materials from thermal degradation and improving product quality and drying efficiency.
Smart Images
Figure CN224388082U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of spray dryer technology, specifically a multi-stage temperature-controlled spray dryer. Background Technology
[0002] Spray drying is a drying technology that disperses liquid materials into fine droplets through an atomizer, rapidly evaporating moisture in hot air to obtain dried powder or granular products. Its working principle is as follows: the raw material liquid is pumped to the atomizer, which disperses it into tiny droplets. These droplets come into full contact with hot air, causing the moisture to evaporate instantly. The droplets are rapidly dried into powder or granules and finally discharged from the bottom of the drying tower. The exhaust gas is treated by a dust removal device before being discharged. Spray drying has many advantages, such as fast drying speed, short material heating time, better preservation of the material's nutrients and active ingredients, high product purity and quality, good dispersibility, solubility and flowability, simple operation, easy automation control, and suitability for large-scale continuous production. This technology is widely used in food, pharmaceutical, and chemical industries, such as in the production of milk powder, coffee, pharmaceutical preparations, and catalysts. Spray drying technology disperses liquid materials into tiny droplets through an atomizer and rapidly dries them into solid powder under the action of hot air. Due to its high efficiency and continuous operation, this technology is widely used in the food, pharmaceutical, and chemical industries.
[0003] However, traditional spray dryers often suffer from inaccurate temperature control during the drying process, which makes heat-sensitive materials susceptible to thermal degradation and affects product quality. Therefore, we need a spray dryer with multi-stage temperature control. Summary of the Invention
[0004] The purpose of this invention is to provide a multi-stage temperature-controlled spray dryer to solve the existing problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage temperature-controlled spray dryer, comprising a drying tower, an atomizer at the top of the drying tower for at least atomizing liquid materials into tiny droplets, a hot air module at the bottom of the drying tower for at least providing hot air required for drying into the interior of the drying tower, an exhaust assembly at the top of the drying tower located outside the atomizer, a diffuser inside the drying tower for at least increasing the contact area between the material and the steam, a primary temperature control module on the hot air module, a secondary temperature control module inside the drying tower, and a tertiary temperature control module on the exhaust assembly. The primary, secondary, and tertiary temperature control modules precisely regulate the inlet temperature, the temperature inside the drying tower, and the outlet temperature of the hot air, respectively. A reheater located inside the drying tower is provided at the top of the hot air module.
[0006] Preferably, a support frame is fixedly installed at the bottom of the drying tower, and the support frame is welded together with support legs and reinforcing rings.
[0007] Preferably, the atomizer includes a feed pipe fixed inside the top of the drying tower, a plurality of guide pipes are fixedly arranged on the outside of the bottom end of the feed pipe, and a plurality of linearly distributed atomizing nozzles are arranged at the bottom of the guide pipes.
[0008] Preferably, the hot air module includes an air supply pipe inserted into the bottom of the drying tower, and a plurality of air distribution pipes are fixedly installed on the outside of the top end of the air supply pipe, and a plurality of jet nozzles are installed on the top of the air distribution pipes.
[0009] Preferably, the exhaust assembly includes a collection hood fixed to the top of the drying tower, and the collection hood is fitted over the outside of the conveying pipe. An exhaust pipe is installed on one outer wall of the collection hood. A flow guide hood fitted over the outside of the conveying pipe is provided inside the top of the drying tower. Several vent holes located outside the flow guide hood are provided on the top of the drying tower.
[0010] Preferably, the diffuser is composed of an inner and outer multi-layer structure, and a mounting bracket fixed to the inner wall of the drying tower is provided below the diffuser.
[0011] Compared with the prior art, the beneficial effects of this utility model are: this multi-stage temperature-controlled spray dryer...
[0012] (1) The atomizer used can transport liquid materials to the interior of the drying tower and atomize them into tiny droplets at the top of the drying tower. The drying tower is the main place for drying materials. The multi-stage temperature control system consists of a primary temperature control module, a secondary temperature control module and a tertiary temperature control module, which respectively control the inlet temperature of hot air, the temperature inside the drying tower and the outlet temperature.
[0013] (2) The diffuser installed inside the drying tower enables the steam to flow from bottom to top inside the drying tower, while the material conveyed into the drying tower is conveyed from top to bottom. The two form a convection, and the high-temperature steam carries away the moisture in the material to achieve the purpose of drying the material. The diffuser increases the contact time between the two and improves the drying effect. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a schematic diagram of the internal structure of this utility model;
[0016] Figure 3 This is a schematic diagram of the atomizer structure of this utility model;
[0017] Figure 4 This is a schematic diagram of the diffuser structure of this utility model;
[0018] Figure 5 This is a schematic diagram of the hot air module structure of this utility model.
[0019] In the diagram: 1. Drying tower; 11. Support frame; 2. Atomizer; 21. Feed pipe; 22. Guide pipe; 23. Atomizing nozzle; 3. Hot air module; 31. Gas supply pipe; 32. Gas distribution pipe; 33. Jet nozzle; 4. Exhaust assembly; 41. Collection hood; 42. Exhaust pipe; 43. Guide hood; 44. Vent hole; 5. Diffuser; 51. Mounting bracket; 6. Primary temperature control module; 7. Secondary temperature control module; 8. Tertiary temperature control module; 9. Reheater. Detailed Implementation
[0020] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.
[0021] Example 1: This embodiment of the present invention provides a multi-stage temperature-controlled spray dryer, including a drying tower 1. An atomizer 2 is installed at the top of the drying tower 1, which is used at least to atomize liquid materials into tiny droplets. A hot air module 3 is installed at the bottom of the drying tower 1, which is used at least to provide the hot air required for drying into the interior of the drying tower 1. An exhaust assembly 4 is installed at the top of the drying tower 1, located outside the atomizer 2. A diffuser 5 is installed inside the drying tower 1, which is used at least to increase the contact area between the material and the steam. A primary temperature control module 6 is installed on the hot air module 3. A secondary temperature control module 6 is installed inside the drying tower 1. The primary temperature control module 7 and the exhaust assembly 4 are equipped with a three-stage temperature control module 8. The primary temperature control module 6, the secondary temperature control module 7 and the tertiary temperature control module 8 precisely regulate the inlet temperature of the hot air, the temperature inside the drying tower 1 and the outlet temperature, respectively. The top of the hot air module 3 is equipped with a reheater 9 located inside the drying tower 1. After the liquid material is conveyed and atomized by the atomizer 2, it enters the interior of the drying tower 1 from top to bottom. At this time, the hot air module 3 is activated, so that the high-temperature steam outside is supplied to the interior of the drying tower 1 through the hot air module 3. At the same time, the steam temperature is adjusted to the set temperature by the primary temperature control module 6 and enters the drying tower 1 to contact the atomized material.
[0022] In this embodiment, a drying tower 1 is included. A support frame 11 is fixedly installed at the bottom of the drying tower 1. The support frame 11 is welded together with support legs and reinforcing rings. The support frame 11 is used to fix the drying tower 1 and provide stable support for the drying tower 1.
[0023] In this embodiment, an atomizer 2 is provided at the top of the drying tower 1. The atomizer 2 is used to atomize liquid materials into tiny droplets. The atomizer 2 includes a conveying pipe 21 fixed inside the top of the drying tower 1. Several guide pipes 22 are fixedly provided outside the bottom end of the conveying pipe 21. Several linearly distributed atomizing nozzles 23 are provided at the bottom of the guide pipes 22. The conveying pipe 21 is connected to a material pump. The material is conveyed through the conveying pipe 21 to the guide pipes 22 by the material pump, and atomized and sprayed out from top to bottom by the atomizing nozzles 23, so that the material flows from top to bottom.
[0024] In this embodiment, a hot air module 3 is provided at the bottom of the drying tower 1. The hot air module 3 is used to provide the hot air required for drying to the interior of the drying tower 1. The hot air module 3 includes a gas supply pipe 31 inserted into the bottom of the drying tower 1. Several gas distribution pipes 32 are fixedly provided on the outside of the top of the gas supply pipe 31, and several jet nozzles 33 are provided on the top of the gas distribution pipes 32. One end of the gas supply pipe 31 is connected to a hot air blower. The hot air blower is used to transport high-temperature steam through the gas supply pipe 31 to the gas distribution pipes 32. The jet nozzles 33 are used to spray the high-temperature steam from bottom to top, forming convection with the downward flowing material.
[0025] In this embodiment, an exhaust assembly 4 is provided at the top of the drying tower 1. The exhaust assembly 4 is located outside the atomizer 2. The exhaust assembly 4 includes a collection hood 41 fixed to the top of the drying tower 1 and the collection hood 41 is sleeved on the outside of the feed pipe 21. An exhaust pipe 42 is installed on one side of the outer wall of the collection hood 41. A guide hood 43 is provided inside the top of the drying tower 1 and sleeved on the outside of the feed pipe 21. Several vent holes 44 are provided at the top of the drying tower 1 located outside the guide hood 43. The top of the drying tower 1 has a constricted structure, which allows high-temperature steam carrying a large amount of moisture from the material to enter the vent holes 44 along the guide hood 43. The steam enters the exhaust pipe 42 through the vent holes 44, and then the steam after heating and drying is further processed.
[0026] In this embodiment, a diffuser 5 is provided inside the drying tower 1. The diffuser 5 is used to increase the contact area between the material and the steam. The diffuser 5 is composed of multiple layers inside and outside. A mounting bracket 51 fixed to the inner wall of the drying tower 1 is provided below the diffuser 5. Each ring of diffuser 5 is a bent structure, which makes the material or steam move in a non-linear way and flow in a curved path in the channel between adjacent diffusers 5, thereby increasing the contact area and contact time between the material and the steam and improving the drying effect of the material.
[0027] In this embodiment, a primary temperature control module 6 is provided on the hot air module 3, a secondary temperature control module 7 is provided inside the drying tower 1, and a tertiary temperature control module 8 is provided on the exhaust assembly 4. The primary temperature control module 6, the secondary temperature control module 7, and the tertiary temperature control module 8 respectively precisely regulate the inlet temperature of the hot air, the temperature inside the drying tower 1, and the outlet temperature. A reheater 9 is provided at the top of the hot air module 3 and located inside the drying tower 1. When the steam temperature inside the drying tower 1 is insufficient, the reheater 9 can be activated to reheat the steam delivered into the drying tower 1 to the set temperature value, which is beneficial for regulating the temperature of the dried steam.
[0028] Working principle: Liquid material is conveyed and atomized by atomizer 2 and enters the interior of drying tower 1 from top to bottom. At this time, hot air module 3 is activated, so that high-temperature steam from the outside is supplied to the interior of drying tower 1 through hot air module 3. At the same time, the primary temperature control module 6 adjusts the steam temperature to the set temperature according to the temperature characteristics of different materials and sets the corresponding drying temperature. The steam enters drying tower 1 and comes into contact with the atomized material. The secondary temperature control module 7 monitors and adjusts the temperature inside drying tower 1 in real time to ensure that the material is dried at the optimal temperature. The tertiary temperature control module 8 regulates the outlet air temperature at exhaust assembly 4 to prevent the material from overheating. The control system set on the outside of drying tower 1 uses the control system to dynamically adjust the working parameters of each level of temperature control module according to real-time temperature feedback.
[0029] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A multi-stage temperature-controlled spray dryer, comprising a drying tower (1), characterized in that: The drying tower (1) is equipped with an atomizer (2) at the top, which is used at least to atomize liquid materials into tiny droplets. A hot air module (3) is provided at the bottom of the drying tower (1), which is used at least to provide the drying tower (1) with the hot air required for drying. An exhaust assembly (4) is provided at the top of the drying tower (1), located outside the atomizer (2). A diffuser (5) is provided inside the drying tower (1), which is used at least to improve air quality. The hot air module (3) is equipped with a primary temperature control module (6), the drying tower (1) is equipped with a secondary temperature control module (7), and the exhaust assembly (4) is equipped with a tertiary temperature control module (8). The primary temperature control module (6), the secondary temperature control module (7) and the tertiary temperature control module (8) respectively control the inlet temperature of the hot air, the temperature inside the drying tower (1) and the outlet temperature. The top of the hot air module (3) is equipped with a reheater (9) located inside the drying tower (1).
2. The multi-stage temperature-controlled spray dryer according to claim 1, characterized in that: The bottom of the drying tower (1) is fixedly provided with a support frame (11), which is made of support legs and reinforcing rings welded together.
3. The multi-stage temperature-controlled spray dryer according to claim 1, characterized in that: The atomizer (2) includes a feed pipe (21) fixed inside the top of the drying tower (1). Several guide pipes (22) are fixedly arranged outside the bottom end of the feed pipe (21). Several linearly distributed atomizing nozzles (23) are arranged at the bottom of the guide pipes (22).
4. The multi-stage temperature-controlled spray dryer according to claim 1, characterized in that: The hot air module (3) includes an air supply pipe (31) inserted into the bottom of the drying tower (1). Several air distribution pipes (32) are fixedly installed on the outside of the top of the air supply pipe (31), and several jet nozzles (33) are installed on the top of the air distribution pipes (32).
5. A multi-stage temperature-controlled spray dryer according to claim 3, characterized in that: The exhaust assembly (4) includes a collection hood (41) fixed to the top of the drying tower (1), and the collection hood (41) is sleeved on the outside of the conveying pipe (21). An exhaust pipe (42) is installed on one side of the outer wall of the collection hood (41). A flow guide hood (43) sleeved on the outside of the conveying pipe (21) is provided inside the top of the drying tower (1). Several vent holes (44) located outside the flow guide hood (43) are provided on the top of the drying tower (1).
6. A multi-stage temperature-controlled spray dryer according to claim 1, characterized in that: The diffuser (5) is composed of an inner and outer multi-layer structure, and a mounting bracket (51) fixed on the inner wall of the drying tower (1) is provided below the diffuser (5).