Flash dryer

Abstract

The utility model relates to the field of sludge treatment, in particular to a flash drying machine which comprises a drying machine body, the drying machine body comprises a drying tank, a hot air pipe and a stirring piece, the hot air pipe and the stirring piece are arranged at the lower section of the drying tank, a discharging pipe is arranged at the top of the drying tank, and a spiral conveying mechanism is connected to the side of the drying tank. The spiral conveying mechanism comprises a shell and a conveying spiral arranged in the shell, the bottom wall of the shell inclines downwards in the direction of the drying tank, and a material flowing gap is formed between the bottom wall of the shell and the edge of the conveying spiral. According to the utility model, the structure of the spiral conveying mechanism is optimized, so that the problems in the prior art are effectively solved.

Description

Technical Field

[0001] The utility model relates to the field of sludge treatment, in particular to a flash drying machine. Background Art

[0002] For sludge carbonization treatment, drying and dehydration before the sludge enters the carbonization furnace is a key link. At present, sludge dehydration is mostly carried out by filter press. The filter press dehydration treatment method can treat the sludge moisture content to between 40% and 70%. In order to improve the efficiency of sludge carbonization. After the sludge is filtered, the sludge is generally flash dried by a flash dryer to pre-treat the sludge entering the carbonization furnace, reduce the moisture content of the sludge to below 30%, and break up the sludge.

[0003] At present, the way for the sludge after filter pressing to enter the flash dryer is mostly to discharge the material into the flash dryer through a conveying screw. Since the sludge after filter pressing is mostly in agglomerate form, when the sludge enters the screw conveyor, the agglomerate sludge is prone to get stuck during the screw conveying process, and the agglomerate material is easily squeezed into blocks with other materials during the movement between the spiral blades, which causes the material to move slowly.

[0004] Therefore, there is an urgent need to improve the feeding technology of the existing flash dryer. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a flash dryer, which effectively solves the problems existing in the prior art by optimizing the structure of the spiral conveying mechanism.

[0006] In order to solve the above problems, the utility model provides a flash dryer, including a dryer body, the dryer body including a drying tank, a hot air pipe and a stirring element arranged in the lower section of the drying tank, a discharge pipe is provided on the top of the drying tank, a spiral conveying mechanism is connected to the side of the drying tank, the spiral conveying mechanism includes an outer shell, and a conveying spiral arranged in the outer shell, the bottom wall of the outer shell is inclined obliquely downward toward the direction of the drying tank, and a flow gap is provided between the bottom wall of the outer shell and the edge of the conveying spiral.

[0007] Furthermore, the distance between the bottom wall of the shell and the outer edge of the conveying spiral gradually increases in the direction toward the drying tank.

[0008] Furthermore, the distance between the top wall of the shell and the outer edge of the conveying spiral gradually increases in the direction toward the drying tank.

[0009] Furthermore, the distance between the end of the shell facing the drying tank and the outer edge of the conveying spiral is greater than or equal to 5 cm and less than or equal to 8 cm.

[0010] Furthermore, two conveying screws are spaced apart in the shell.

[0011] Furthermore, the distance between the edges of the two conveying spirals is greater than or equal to 3 cm and less than or equal to 5 cm.

[0012] Furthermore, a material guide layer is provided on the inner surface of the bottom wall of the shell, so that the friction coefficient of the bottom wall of the shell is smaller than the friction coefficient of the top wall of the shell.

[0013] Furthermore, the material conducting layer is configured as a ceramic material conducting layer.

[0014] The beneficial effect of the utility model is that the problems existing in the prior art are effectively solved by optimizing the structure of the screw conveying mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It is a schematic side sectional structure diagram of an embodiment of the utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of a top sectional view of the spiral conveying mechanism in the illustrated embodiment.

[0018] Among them: 1. Dryer body; 101. Drying tank; 102. Hot air pipe; 103. Agitator; 2. Discharge pipe; 3. Shell; 4. Conveying screw; 5. Flow gap; 6. Material guide layer. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in combination with the accompanying drawings by way of examples.

[0020] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0021] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected bodies are not connected through an intermediate structure, but are connected to form a whole only through a connecting structure. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0023] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0024] In the present utility model, if Figure 1-2 As shown, a flash dryer is provided, including a dryer body 1, the dryer body 1 includes a drying tank 101, a hot air pipe 102 and a stirring member 103 arranged at the lower section of the drying tank 101, a discharge pipe 2 is arranged on the top of the drying tank 101, a spiral conveying mechanism is connected to the side of the drying tank 101, the spiral conveying mechanism includes a shell 3, a conveying screw 4 arranged in the shell 3, the bottom wall of the shell 3 is inclined obliquely downward toward the direction of the drying tank 101, and a flow gap 5 is provided between the bottom wall of the shell 3 and the edge of the conveying screw 4.

[0025] The utility model sets the bottom wall of the shell 3 to be tilted downward toward the drying tank 101, and there is a flow gap 5 between the conveying screw 4 and the bottom wall of the shell 3, so that after some small-particle loose materials entering the shell 3 fall into the flow gap 5, when the conveying screw 4 rotates to drive the materials to move downward, the small-particle and loose materials in the flow gap 5 can slide downward quickly and be discharged under the inclined extension of the bottom wall of the shell 3, the direct drive of the rotation of the conveying screw 4, and the indirect drive of the conveying screw 4 pushing the materials. Compared with the working condition in which the small-particle and loose materials in the existing conveying screw 4 are blocked by the spiral blades and the agglomerated materials in the spiral blades, the efficiency of discharging the small-particle and loose materials can be improved.

[0026] Moreover, some agglomerated materials are continuously pushed forward and destroyed during the movement in the conveying screw 4. Since the materials in the flow gap 5 can quickly slide downward, the small-sized and loose materials destroyed by the agglomerated materials during the conveying process can also enter the flow gap 5, thereby reducing the amount of material deposition between the spiral blades, thereby reducing the condition in which the agglomerates are squeezed into strips or blocks between the spiral blades.

[0027] In a preferred embodiment, the present invention is further optimized in that the distance between the bottom wall of the housing 3 and the outer edge of the conveying screw 4 gradually increases in the direction toward the drying tank 101 .

[0028] As shown in the figure, in the process of the conveying screw 4 conveying the material downward, at the beginning of the material entering the shell 3, the gap between the conveying screw 4 and the bottom wall of the shell 3 is small, which can promote the contact between the conveying screw 4 and the material to stir and destroy the agglomerated material. In the process of the material moving downward, the gap between the conveying screw 4 and the bottom wall of the shell 3 gradually increases, the small particle size and loose materials gradually increase, and the flow space of the material in the flow process gradually increases, which can reduce the pressure transmitted to the flow gap 5 by the conveying screw 4 during the material movement, so that the material flowing into the drying tank 101 through the flow gap 5 is loose and the agglomerates are small, so as to be quickly blown away and dried by hot air.

[0029] In the illustrated embodiment, a further optimized setting is that the distance between the top wall of the housing 3 and the outer edge of the conveying screw 4 gradually increases in the direction toward the drying tank 101. As shown in the figure, the upper side of the lower section of the conveying screw 4 has a larger activity space, so that when the conveying screw 4 pushes the material to this area, the conveying screw 4 can more easily drive the material to the upper half of the housing 3, which can reduce the pressure of the flow gap 5 at this position, thereby further promoting the downward movement of the material at the flow gap 5.

[0030] As a preferred embodiment, the present invention is further optimized in that the distance between the end of the housing 3 facing the drying tank 101 and the outer edge of the conveying screw 4 is greater than or equal to 3 cm and less than or equal to 5 cm.

[0031] By controlling the maximum distance between the housing 3 and the end and the conveying screw 4 to be 8 cm, the amount of large lumps of material in the material discharged from the housing 3 can be reduced, and the ability of the spiral blade to push the material in the flow gap 5 when rotating can be maintained. In addition, by controlling the minimum distance between the housing 3 and the end and the conveying screw 4 to be 5 cm, the flow gap 5 can be kept to have sufficient discharge space.

[0032] In a preferred embodiment, as shown in the figure, a further optimized setting of the utility model is that two conveying screws 4 are arranged in the housing 3. As shown in the figure, the two conveying screws 4 can be used to synchronously rotate and convey materials, and the material destruction between the two conveying screws 4 can be promoted.

[0033] As a preferred embodiment, a further optimized setting of the utility model is that the distance between the edges of the two conveying screws 4 is greater than or equal to 3 cm and less than or equal to 5 cm.

[0034] As a further optimization of the present invention, a material guide layer 6 is provided on the inner surface of the bottom wall of the shell 3 so that the friction coefficient of the bottom wall of the shell 3 is smaller than the friction coefficient of the top wall of the shell 3 .

[0035] By providing the guide layer, the smoothness of the material flow in the guide layer 6 can be improved, so as to promote the rapid flow of the material in the flow gap 5.

[0036] In a preferred embodiment, regarding the setting of the material conducting layer 6, more specifically, the material conducting layer 6 is set as a ceramic material conducting layer.

[0037] It should be noted that, in the illustrated embodiment, for the structures of the stirring member and the hot air pipe, those skilled in the art may flexibly select existing structural components during implementation, which will not be described in detail herein.

[0038] As for the feed port of the screw conveying mechanism, as shown in the figure, a feed hopper is arranged on the upper section of the shell. As for the driving mode of the conveying screw of the screw conveying mechanism, in a preferred embodiment, a reduction motor can be directly connected to the conveying screw.

[0039] In the description of the embodiments of the present invention, the bottom wall and top wall of the shell are divided by the center line of the shell, where the shell part on the upper side of the center line forms the top wall, and the shell part on the lower side of the center line forms the bottom wall.

[0040] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0041] The above is only the embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A flash dryer, comprising a dryer body, the dryer body comprising a drying tank, a hot air pipe and a stirring element arranged at the lower section of the drying tank, a discharge pipe being arranged at the top of the drying tank, characterized in that: A screw conveying mechanism is connected to the side of the drying tank, and the screw conveying mechanism includes a shell and a conveying screw arranged in the shell. The bottom wall of the shell is inclined downward toward the drying tank, and there is a flow gap between the bottom wall of the shell and the edge of the conveying screw.

2. The flash dryer according to claim 1, characterized in that: The distance between the bottom wall of the shell and the outer edge of the conveying spiral gradually increases in a direction toward the drying tank.

3. The flash dryer according to claim 1, characterized in that: The distance between the top wall of the shell and the outer edge of the conveying spiral gradually increases in a direction toward the drying tank.

4. The flash dryer according to claim 2, characterized in that: The distance between the end of the shell facing the drying tank and the outer edge of the conveying spiral is greater than or equal to 5 cm and less than or equal to 8 cm.

5. The flash dryer according to claim 1, characterized in that: Two conveying screws are arranged in the shell at intervals.

6. The flash dryer according to claim 5, characterized in that: The distance between the edges of the two conveying spirals is greater than or equal to 3 cm and less than or equal to 5 cm.

7. The flash dryer according to claim 1, characterized in that: A material guide layer is provided on the inner surface of the bottom wall of the shell, so that the friction coefficient of the bottom wall of the shell is smaller than the friction coefficient of the top wall of the shell.

8. The flash dryer according to claim 7, characterized in that: The material conducting layer is configured as a ceramic material conducting layer.

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