Device for drying potato residues through steam waste heat in potato whole powder drying process

Abstract

The utility model discloses a device for drying potato residues through steam waste heat in the potato whole powder drying process, belongs to the field of potato powder production, and solves the problem that complete drying cannot be achieved through an existing potato residue drying method. The device comprises a roller dryer, a heat exchanger and a drying bed, a hot water tank is arranged at the bottom of the drying bed; an exhaust port and a water outlet are formed in the side of the hot water tank; the roller dryer is connected to the inlet end of the heat exchanger through a conveying pipeline, the outlet end of the heat exchanger is connected to the hot water tank through a buffer pipeline, and a valve is arranged on the conveying pipeline. Steam waste heat generated by a roller dryer in a potato whole powder drying workshop is used as a heat source, the steam waste heat is connected with the hot water tank below the drying bed in series, the steam temperature is adjusted through the heat exchanger to become hot water suitable for the potato residue drying temperature, potato residues are dried, and energy is saved.

Description

Technical Field

[0001] The utility model belongs to the field of potato powder production, and particularly relates to a device for drying potato residues by using the waste heat of steam in the drying process of whole potato powder. Background Art

[0002] At present, there is a method of dehydrating potato residues by using a dehydrating agent. The disadvantage of this technology is that other dehydrating agent components are added to the potato residues. If the residues are further used for fertilizers and feeds, the addition of extra components will have an adverse impact on them. In addition, this method of using a dehydrating agent cannot completely dry the potato residues, and other auxiliary means need to be combined for further treatment to dry them.

[0003] There are also other methods for dehydrating potato residues. Two-stage extrusion dehydration and pressure forced dehydration are used for dehydrating potato residues. The composition of the dehydration equipment is relatively complex and requires multiple dehydrations to complete. Moreover, the final moisture content of the residues drops to 80%, and they still cannot be completely dried. Other means need to be relied on for complete drying before they can be stored and transported.

[0004] Therefore, the existing methods for drying potato residues cannot meet the requirement of complete drying, have poor economy, and there are certain difficulties in realizing industrial applications. If an external heat source is used to dry the potato residues again, it will undoubtedly increase the treatment cost of potato solid waste. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a device for drying potato residues by using the waste heat of steam in the drying process of whole potato powder, so as to solve the problem that the existing methods for drying potato residues cannot achieve complete drying.

[0006] The technical solution of the utility model is: a device for drying potato residues by using the waste heat of steam in the drying process of whole potato powder, which includes a drum dryer, a heat exchanger and a drying bed; a hot water tank is arranged at the bottom of the drying bed, and an exhaust port and a water outlet are arranged at the side of the hot water tank; the drum dryer is connected to the inlet end of the heat exchanger through a conveying pipeline, and the outlet end of the heat exchanger is connected to the hot water tank through a buffer pipeline, and a valve is arranged on the conveying pipeline.

[0007] As a further improvement of the utility model, it further includes a silo, the silo is connected to the drying bed through a conveyor belt, and the drying bed is located below the conveyor belt.

[0008] As a further improvement of the utility model, a scraper is arranged above the drying bed, and there is a gap between the lower end of the scraper and the upper surface of the drying bed.

[0009] As a further improvement of the utility model, a blanking plate is arranged at the end of the drying bed.

[0010] As a further improvement of the present utility model, a draft fan is provided at the inlet end of the heat exchanger.

[0011] As a further improvement of the present utility model, a pressure pump is provided at the end of the buffer pipeline.

[0012] As a further improvement of the present utility model, a heat insulation layer is provided outside the buffer pipeline.

[0013] The beneficial effects of the present utility model are as follows: The present utility model utilizes the waste heat of the steam generated by the drum dryer in the potato whole powder drying workshop as the heat source, connects it in series with the hot water tank under the drying bed, adjusts the steam temperature through the heat exchanger, makes it into hot water suitable for the drying temperature of potato residue, and dries the potato residue with a water content as high as 80%-90%, saving energy, realizing the effective treatment of potato processing by-products, further strengthening the high-value utilization of processing waste, and turning it into excellent raw materials for the next additional product. This device can be incorporated into the processing chain of potato whole powder drying, reducing a large amount of hot gas emissions while treating processing by-products, greatly reducing waste emissions and significantly increasing the value of additional products. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of the present utility model.

[0015] In the figure: 1 - drum dryer; 2 - conveying pipeline; 3 - draft fan; 4 - heat exchanger; 5 - buffer pipeline; 6 - pressure pump; 7 - heat insulation layer; 8 - drying bed; 9 - conveyor belt; 10 - scraper; 11 - blanking plate; 12 - exhaust port; 13 - water outlet; 14 - storage bin; 15 - hot water tank. Detailed Embodiment

[0016] The present utility model will be described in detail below with reference to the accompanying drawings.

[0017] As Figure 1 shown, a device for drying potato residue using the waste heat of steam during the drying process of potato whole powder includes a drum dryer 1, a heat exchanger 4, and a drying bed 8; a hot water tank 15 is provided at the bottom of the drying bed 8, an exhaust port 12 and a water outlet 13 are provided on the side of the hot water tank 15, and valves are provided at both the exhaust port 12 and the water outlet 13; the drum dryer 1 is connected to the inlet end of the heat exchanger 4 through a conveying pipeline 2, and the outlet end of the heat exchanger 4 is connected to the hot water tank 15 through a buffer pipeline 5, and a valve is provided on the conveying pipeline 2.

[0018] It further includes a storage bin 14, the storage bin 14 is connected to the drying bed 8 through a conveyor belt 9, and the drying bed 8 is located below the conveyor belt 9.

[0019] A scraper 10 is provided above the drying bed 8, and there is a gap between the lower end of the scraper 10 and the upper surface of the drying bed 8. A blanking plate 11 is provided at the end of the drying bed 8.

[0020] The inlet end of the heat exchanger 4 is provided with an induced draft fan 3.

[0021] A pressure pump 6 is provided at the end of the buffer pipeline 5. A heat preservation layer 7 is provided outside the buffer pipeline 5.

[0022] The drying bed 8, the hot water tank 15 and the scraper 10 are all made of stainless steel plates.

[0023] Example 1

[0024] A certain potato whole powder processing enterprise uses the waste potato residues produced for the fermentation of animal feed. The main components of the potato residues include cellulose, hemicellulose, pectin, etc., and the moisture content is 80 - 90%. There are 4 drum dryers 1 in the potato whole powder drying workshop.

[0025] The high - temperature steam generated by the drum dryer 1 in the potato whole powder drying workshop has a temperature higher than 100 °C (about 100 - 105 °C) and cannot be directly used for drying the potato residues. High temperature is likely to cause the adhesion and coking of wet potato residues, resulting in a decline in the quality of the dried products and waste of resources. Therefore, the high - temperature steam is transported to the heat exchanger 4 through the conveying pipeline 2 and the induced draft fan 3. After heat exchange, the high - temperature steam is converted into high - temperature hot water with a temperature of 85 - 90 °C. The high - temperature hot water is transported to the hot water tank 15 through the buffer pipeline 5 and the pressure pump 6 to provide heat for the drying bed 8. After the hot water tank 15 is filled with water, the valve on the conveying pipeline 2 is closed. During the process of hot water entering the hot water tank 15, the valve on the exhaust port 12 is opened to help exhaust, and the valve on the water outlet 13 is closed. The potato residues are stored in the silo 14 and conveyed to the drying bed 8 by the conveyor belt 9. During the feeding process of the drying bed 8, the scraper 10 levels the potato residues, making them evenly spread on the surface of the conveyor belt 9 with a thickness not greater than 3 cm. Then the conveyor belt 9 is closed, and the potato residues above the drying bed 8 are dried. After drying, the conveyor belt 9 is opened again, and the dried potato residues are discharged from the blanking plate 11, and the conveyor belt 9 conveys the next batch of potato residues to the drying bed 8.

[0026] After drying, the moisture content of the potato residues is about 3%, without harmful components and no peculiar smell.

[0027] A temperature sensor is provided in the hot water tank 15. When it is detected that the hot water temperature in the hot water tank 15 is not sufficient for drying operations, the valve on the water outlet 13 is opened to drain water, and new hot water is re - injected.

[0028] A pressure sensor is provided in the conveying pipeline 2. When it is detected that the pressure in the conveying pipeline 2 is too high, the valve on the conveying pipeline 2 is closed.

[0029] After being buffered in the buffer pipeline 5, the high - temperature hot water can enter the hot water tank 15 evenly and smoothly. The heat preservation layer 7 is arranged outside the buffer pipeline 5 to insulate the buffer pipeline 5 and ensure the hot water temperature.

[0030] Inside the heat exchanger 4, high-temperature steam exchanges heat with cold water, and the heated cold water can be used for domestic water in the plant area.

[0031] Using the present utility model for drying potato residues improves the drying effect of potato residues compared with the traditional sun-drying process or dehydration process, fully utilizes the steam waste heat in the process of drying potato whole powder, reduces energy consumption, and has a high degree of mechanization. The present utility model is simple to operate and has low operating costs, and is suitable for application in the drying and popularization of by-products in the potato processing industry.

Claims

1. An apparatus for drying potato residues by using the waste heat of steam during the drying process of whole potato powder, characterized in that: It includes a drum dryer (1), a heat exchanger (4) and a drying bed (8); a hot water tank (15) is provided at the bottom of the drying bed (8), and an exhaust port (12) and a water outlet (13) are provided on the side of the hot water tank (15); the drum dryer (1) is connected to the inlet end of the heat exchanger (4) through a conveying pipeline (2), and the outlet end of the heat exchanger (4) is connected to the hot water tank (15) through a buffer pipeline (5), and a valve is provided on the conveying pipeline (2).

2. The device for drying potato residue by using the waste heat of steam during the drying process of whole potato powder according to claim 1, characterized in that: It further includes a silo (14), and the silo (14) is connected to the drying bed (8) through a conveyor belt (9), and the drying bed (8) is located below the conveyor belt (9).

3. An apparatus for drying potato residues by using the waste heat of steam during the drying process of whole potato powder according to claim 1 or 2, characterized in that: A scraper (10) is provided above the drying bed (8), and there is a gap between the lower end of the scraper (10) and the upper surface of the drying bed (8).

4. An apparatus for drying potato residues using the waste heat of steam during the drying process of whole potato powder according to claim 3, characterized in that: A blanking plate (11) is provided at the end of the drying bed (8).

5. An apparatus for drying potato residue using the waste heat of steam during the drying process of whole potato powder according to claim 4, characterized in that: An induced draft fan (3) is provided at the inlet end of the heat exchanger (4).

6. The device for drying potato residue by using the waste heat of steam during the drying process of whole potato powder according to claim 5, characterized in that: A pressure pump (6) is provided at the end of the buffer pipeline (5).

7. An apparatus for drying potato residue by using waste heat of steam during the drying process of whole potato powder according to claim 6, characterized in that: A heat insulation layer (7) is provided on the outside of the buffer pipeline (5).

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