Spray dryer with preheat recovery

Abstract

The utility model relates to spray drier equipment technical field, concretely relates to a kind of spray drier with preheating recovery, including cylinder, the upper portion of the cylinder is provided with atomizing nozzle and dehumidifier, the outside of the cylinder is provided with storage tank, conveying pipeline is provided between the storage tank and atomizing nozzle, heat recovery assembly connected with dehumidifier is provided on the storage tank and conveying pipeline, by heat preservation shell, preheating bucket are segmented with waste heat, improve waste heat utilization, and further the effect of large bag lifting drying efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of spray dryer equipment, specifically to a spray dryer with preheating recovery function. Background Technology

[0002] Spray dryers, widely used in chemical, food, and pharmaceutical industries, work by atomizing liquid materials into tiny droplets, which are then rapidly dried with hot air to produce powdered or granular products. However, traditional spray dryers often generate significant amounts of waste heat during the drying process. If this waste heat is not effectively utilized, it not only wastes energy but may also have negative environmental impacts.

[0003] In recent years, with increasing environmental awareness and the pursuit of energy efficiency, spray dryers with preheating recovery functions have gradually gained market favor. This equipment retains the advantages of traditional spray dryers while incorporating preheating recovery technology to reuse waste heat, thereby improving energy efficiency, reducing production costs, and minimizing environmental pollution.

[0004] For example, Chinese Patent (Application No.: 202022222039.1) discloses a spray dryer with a mother liquor preheating function, including a spray dryer body. A spiral plate extending axially along the outer wall of the spray dryer body is provided around the outer wall of the spray dryer body. The inner side of the spiral plate is connected to the outer wall of the spray dryer body. The outer wall of the spray dryer body and the spiral plate together form a spiral groove around the outer wall of the spray dryer body. The groove opening is provided with a heat-insulating cover. The spiral plate is made of a heat-conducting material. A heat-conducting pipe is provided in the spiral groove. In use, one end of the heat-conducting pipe is used to connect to the atomizer, and the other end of the heat-conducting pipe is used to connect to the mother liquor inlet pipe. The mother liquor exchanges heat with the heat emitted by the spray dryer body in the heat-conducting pipe, thereby obtaining preheating. The preheated mother liquor is more easily dried by hot air after being atomized in the spray dryer body, which has the advantage of high drying efficiency.

[0005] Although the equipment can utilize waste heat and improve drying efficiency, the utilization rate of waste heat is low, and there is still a phenomenon of heat waste. Utility Model Content

[0006] To address the aforementioned problems, this utility model provides a spray dryer that improves waste heat utilization efficiency through a stepped waste heat utilization method.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a spray dryer with preheat recovery, comprising a cylinder, an atomizing nozzle and a dehumidifier being provided on the upper part of the cylinder, a storage tank being provided on the outside of the cylinder, a conveying pipe being provided between the storage tank and the atomizing nozzle, and a heat recovery component connected to the dehumidifier being provided on the storage tank and the conveying pipe.

[0008] As a further improvement to the above technical solution:

[0009] The heat recovery assembly includes an insulated shell disposed outside the conveying pipeline, a preheating tank disposed outside the storage tank, and a connecting pipe for connecting the insulated shell and the preheating tank.

[0010] The insulation shell is fitted over the outside of the conveying pipe, and the inside of the insulation shell is provided with a storage chamber for the conveying pipe to pass through. The diameter of the storage chamber gradually increases from the end closest to the dehumidifier outward.

[0011] The side wall of the storage chamber is provided with flow-blocking fins, and there are multiple flow-blocking fins, each of which is arranged along the length of the heat-insulating shell.

[0012] The preheating tank includes an inner layer and an outer layer, and a flow guide coil is provided between the inner layer and the outer layer.

[0013] The upper part of the guide coil is provided with a water inlet connected to the connecting pipe, and the lower part is provided with a water outlet extending to the outside of the preheating tank.

[0014] A gap is reserved between the flow guide coil and the outer layer, and thermal insulation filler is installed in the gap.

[0015] The beneficial effects of this utility model embodiment are as follows: 1. The spray dryer with preheat recovery includes a cylinder, an atomizing nozzle and a dehumidifier are provided on the upper part of the cylinder, a storage tank is provided on the outside of the cylinder, a conveying pipe is provided between the storage tank and the atomizing nozzle, and a heat recovery component connected to the dehumidifier is provided on the storage tank and the conveying pipe. Waste heat is utilized in stages through the heat insulation shell and the preheating tank, thereby improving the waste heat utilization rate and thus improving the drying efficiency of the large bag.

[0016] 2. The insulation shell is fitted over the outside of the conveying pipe. The inside of the insulation shell is a storage chamber for the conveying pipe to pass through. The diameter of the storage chamber gradually increases from the end closest to the dehumidifier outward. The storage chamber is designed in the shape of a frustum cone, forming a flow guide slope on the inner wall of the insulation shell, which facilitates the flow of hot air into the preheating tank after condensation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a cross-sectional view of the conveying pipeline in this utility model;

[0020] Figure 4 This is a schematic diagram of the distribution structure of the flow-blocking fins in this utility model.

[0021] In the diagram: 1. Cylinder; 2. Atomizing nozzle; 3. Dehumidifier; 4. Storage tank; 5. Conveying pipe; 6. Insulation shell; 7. Preheating tank; 8. Connecting pipe; 9. Storage chamber; 10. Flow-blocking fins; 11. Inner layer; 12. Outer layer; 13. Flow guide coil; 14. Water inlet; 15. Water outlet. Detailed Implementation

[0022] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] As shown in Figure 4, the spray dryer with preheating recovery in this embodiment includes a cylinder 1. An atomizing nozzle 2 and a dehumidifier 3 are installed on the upper part of the cylinder 1. A storage tank 4 is provided on the outside of the cylinder 1. The storage tank 4 and the atomizing nozzle 2 are connected by a conveying pipe 5. Both the storage tank 4 and the conveying pipe 5 are equipped with heat recovery components connected to the dehumidifier 3. The heat recovery components can reuse the high-temperature hot air recovered by the dehumidifier 3 to raise the temperature of the material in the storage tank 4 and the conveying pipe 5, so that the initial temperature of the material when it enters the cylinder 1 is increased, thereby improving the efficiency of spray drying. At the same time, the waste heat can be recycled.

[0024] The heat recovery assembly includes an insulation shell 6 located outside the conveying pipe 5, a preheating tank 7 located outside the storage tank 4, and a connecting pipe 8 for connecting the insulation shell 6 and the preheating tank 7. The hot air extracted by the dehumidifier 3 first passes through the insulation shell 6 and then through the preheating tank 7, so as to classify and utilize the heat and improve the utilization rate of waste heat.

[0025] The insulation shell 6 is fitted outside the conveying pipe 5. The interior of the insulation shell 6 is provided with a storage chamber 9 for the conveying pipe 5 to pass through. The storage chamber 9 extends outward from the end near the dehumidifier 3 and the diameter gradually increases. The storage chamber 9 is designed in the shape of a frustum cone, forming a guide slope on the inner wall of the insulation shell 6, which facilitates the flow of hot air into the preheating tank 7 after condensation.

[0026] The side wall of the storage chamber 9 is provided with flow-blocking fins 10. There are multiple flow-blocking fins 10, and each flow-blocking fin 10 is arranged along the length of the insulation shell 6. It will not affect the flow of condensate in the insulation shell 6, and at the same time, it can slow down the movement of hot air and prolong the time of hot air in the insulation shell 6.

[0027] The preheating tank 7 includes an inner layer 11 and an outer layer 12. A guide coil 13 is provided between the inner layer 11 and the outer layer 12. The inner layer is in contact with the storage tank 4. The water that flows in after condensation in the guide coil 13 heats the material in the storage tank 4, making secondary use of waste heat. At the same time, it can also reduce the heat absorbed by the material in the insulation shell 6.

[0028] The upper part of the guide coil 13 is provided with an inlet 14 connected to the connecting pipe 8, and the lower part is provided with an outlet 15 extending to the outside of the preheating tank 7. The guide coil 13 plays the role of heat preservation and flow diversion, and can condense and discharge the extracted hot air. A filter is provided between the inlet 14 and the connecting pipe 8 to prevent impurities from flowing into the guide coil 13.

[0029] A gap is reserved between the flow guide coil 13 and the outer layer 12, and thermal insulation filler is installed in the gap. The thermal insulation filler can prevent heat from being lost to the outside and improve the preheating effect and duration.

[0030] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element 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. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0033] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A spray dryer with preheat recovery, comprising a cylinder (1), wherein an atomizing nozzle (2) and a dehumidifier (3) are disposed on the upper part of the cylinder (1), characterized in that: The cylinder (1) is provided with a storage tank (4) on its outside. A conveying pipe (5) is provided between the storage tank (4) and the atomizing nozzle (2). A heat recovery component connected to the dehumidifier (3) is provided on the storage tank (4) and the conveying pipe (5).

2. The spray dryer with preheat recovery according to claim 1, characterized in that: The heat recovery assembly includes an insulation shell (6) disposed outside the conveying pipe (5), a preheating barrel (7) disposed outside the storage tank (4), and a connecting pipe (8) for connecting the insulation shell (6) and the preheating barrel (7).

3. The spray dryer with preheat recovery according to claim 2, characterized in that: The heat insulation shell (6) is fitted outside the conveying pipe (5). The heat insulation shell (6) has a storage chamber (9) for the conveying pipe (5) to pass through. The storage chamber (9) extends outward from the end near the dehumidifier (3) and its diameter gradually increases.

4. The spray dryer with preheat recovery according to claim 3, characterized in that: The side wall of the storage chamber (9) is provided with flow-blocking fins (10), and there are multiple flow-blocking fins (10), each of which is arranged along the length direction of the heat-insulating shell (6).

5. The spray dryer with preheat recovery according to claim 2, characterized in that: The preheating tank (7) includes an inner layer (11) and an outer layer (12), and a flow guide coil (13) is provided between the inner layer (11) and the outer layer (12).

6. The spray dryer with preheat recovery according to claim 5, characterized in that: The upper part of the guide coil (13) is provided with an inlet (14) connected to the connecting pipe (8), and the lower part is provided with an outlet (15) extending to the outside of the preheating tank (7).

7. The spray dryer with preheat recovery according to claim 5, characterized in that: A gap is reserved between the flow guide coil (13) and the outer layer (12), and thermal insulation filler is provided in the gap.

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