Heat pump and hot water combined drying machine for drying biogas residues

Abstract

The utility model discloses a heat pump and hot water combined drying machine for drying biogas residues, and relates to the technical field of biogas residue drying. The drying device comprises a box body, a breathable conveying belt used for conveying materials is arranged in the box body, and a feeding part, a drying part and a discharging part are sequentially arranged in the box body in the material conveying direction. A feeding mechanism is mounted at the top of the loading part; a water heat exchanger is installed on the top face of the drying part, the bottom face of the drying part is communicated with an exhaust fan, the air outlet end of the exhaust fan is communicated with the air inlet end of the water heat exchanger through an evaporative condenser, and the air outlet end of the water heat exchanger is communicated with an inner cavity of the drying part; the discharging part is used for collecting and outputting materials on the breathable conveying belt; the drying equipment is high in drying treatment capacity, free of pollution and high in efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of biogas residue drying, in particular to a heat pump hot water combined drying machine for biogas residue drying. Background Art

[0002] With the gradual improvement of the quality of life of the people, the dairy industry has developed rapidly in recent years, and the domestic dairy industry has flourished. As a result, the pressure on the treatment of manure and sewage in dairy farms has increased. At present, most large-scale dairy farms use wet anaerobic fermentation to produce biogas to treat manure and sewage in cattle farms. In dairy farms, scrapers are generally used to scrape manure, and the liquid phase biogas liquid after anaerobic fermentation and solid-liquid separation is used to flush the cow manure scraped into the manure trough into the manure collection pool, and then the manure and sewage are pumped from the pool to the anaerobic biogas treatment center for centralized treatment.

[0003] In dairy farms, cows’ beds are mostly made of sawdust bedding, which will inevitably be mixed with manure and sewage during the process of scraping and flushing manure. How to separate the sawdust mixed with the biogas slurry after anaerobic fermentation and reuse it as cow bedding has been a hot topic in recent years. The greater the reuse amount, the greater the closed-loop use of bedding, and the higher the profits of dairy farms and dairy farm manure treatment parties. They no longer need to spend too much money every day to purchase new sawdust bedding.

[0004] At present, a large number of dairy farms in China use rotary kiln drying or traditional belt dryers. The traditional methods have relatively high energy consumption, poor production and working environment, heavy dust pollution, and are in an overall relatively backward state. Utility Model Content

[0005] The utility model aims to provide a heat pump hot water combined dryer for biogas residue drying, so as to achieve the purpose of large drying processing capacity, no pollution and high efficiency of the drying equipment.

[0006] In order to achieve the above purpose, the utility model adopts the following technical means:

[0007] A heat pump hot water combined dryer for drying biogas residue, comprising a box body, a breathable conveyor belt for conveying materials is arranged in the box body, and a loading part, a drying part and a discharging part are arranged in sequence in the box body along the material conveying direction;

[0008] A feeding mechanism is installed on the top of the feeding part;

[0009] A water heat exchanger is installed on the top surface of the drying section, and an exhaust fan is connected to the bottom surface. The air outlet of the exhaust fan is connected to the air inlet of the water heat exchanger through an evaporative condenser, and the air outlet of the water heat exchanger is connected to the inner cavity of the drying section.

[0010] The unloading part is used to collect and output the materials on the air-permeable conveyor belt.

[0011] Preferably, the drying section is provided with a first drying zone, a second drying zone and a third drying zone in sequence along the material conveying direction, the top surfaces of the first drying zone, the second drying zone and the third drying zone are provided with the water heat exchanger, and the bottom surfaces of the first drying zone, the second drying zone and the third drying zone are respectively connected to the exhaust fan.

[0012] Furthermore, the temperature of the second drying zone is higher than that of the first drying zone, the temperature of the third drying zone is set between the temperatures of the first drying zone and the second drying zone, the first drying zone is used to preheat the material, the second drying zone is used to dry the material at high temperature, and the third drying zone is used to dry the material at the end.

[0013] Furthermore, a toothed roller disturbance mechanism is provided in both the first drying zone and the second drying zone, the rotation axis of the toothed roller disturbance mechanism is horizontally arranged, the bottom outer wall of the toothed roller disturbance mechanism is arranged above the breathable conveyor belt, and the rotation direction of the bottom outer wall of the toothed roller disturbance mechanism is the same as the material conveying direction.

[0014] Furthermore, a roller brush is installed in the unloading section, and the roller brush is arranged on the lower side of the feeding end of the breathable conveyor belt. The roller brush surface of the roller brush is in contact with the breathable conveyor belt, and the rotation direction of the roller brush surface is opposite to the moving direction of the breathable conveyor belt.

[0015] During use, the utility model has the following beneficial effects:

[0016] When drying the material, the material to be dried is stably fed to the breathable conveyor belt in the box through the feeding mechanism in the feeding part. The circulating reflux air is heated by hot water in the water heat exchanger installed above the box and becomes hot air in the drying chamber. It passes through the material on the breathable conveyor belt from top to bottom to take away the moisture in the material and is extracted out of the box by the exhaust fan below. At this time, the temperature is lowered and the gas is almost saturated with water. It is transported to the evaporative condenser by the exhaust fan to condense the liquid water precipitated during the gas cooling process, and then passes to the water heat exchanger to enter the top of the box for the next round of heat exchange cycle. After the material is turned over and dried, it is output from the discharge part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model.

[0018] Among them, 1-box, 2-breathable conveyor belt, 3-loading part, 4-drying part, 41-first drying zone, 42-second drying zone, 43-third drying zone, 5-unloading part, 6-feeding mechanism, 7-water heat exchanger, 8-exhaust fan, 9-evaporative condenser, 10-roller brush, 11-tooth roller disturbance mechanism. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0022] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0023] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the utility model product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Please refer to Figure 1 As shown, a heat pump hot water combined dryer for drying biogas residue comprises a box body 1, a breathable conveyor belt 2 for conveying materials is arranged in the box body 1, and a loading part 3, a drying part 4 and a discharging part 5 are arranged in sequence in the box body 1 along the material conveying direction;

[0026] A feeding mechanism 6 is installed on the top of the feeding part 3;

[0027] The top surface of the drying section 4 is provided with a water heat exchanger 7, and the bottom surface is connected with an exhaust fan 8, the air outlet end of the exhaust fan 8 is connected with the air inlet end of the water heat exchanger 7 through an evaporative condenser 9, and the air outlet end of the water heat exchanger 7 is connected with the inner cavity of the drying section 4;

[0028] The discharging portion 5 is used to collect and output the materials on the air-permeable conveyor belt 2 .

[0029] In this way, when drying the material, the material to be dried is stably fed to the air conveyor belt 2 in the box 1 through the feeding mechanism 6 in the feeding part 3. The circulating reflux air is heated by hot water in the water heat exchanger 7 installed above the box 1 and becomes hot air in the drying bin. It passes through the material on the air conveyor belt 2 from top to bottom to take away the moisture in the material and is extracted out of the box 1 by the exhaust fan 8 below. At this time, the temperature is lowered and the gas is almost saturated with water. It is transported to the evaporative condenser 9 through the exhaust fan 8 to first condense the liquid water precipitated during the gas cooling process, and then passes to the water heat exchanger 7 to enter the top of the box 1 for the next round of heat exchange cycle. After the material is turned over and dried, it is output from the discharge part 5.

[0030] Furthermore, in order to perform zoned temperature control for drying in the box body 1, the drying section 4 is provided with a first drying zone 41, a second drying zone 42 and a third drying zone 43 in sequence along the material conveying direction, and the top surfaces of the first drying zone 41, the second drying zone 42 and the third drying zone 43 are provided with the water heat exchanger 7, and the bottom surfaces of the first drying zone 41, the second drying zone 42 and the third drying zone 43 are respectively connected to the exhaust fan 8.

[0031] In this way, the temperature of the hot air entering the different drying zones can be controlled by adjusting the working state of the water heat exchanger 7 above the different drying zones.

[0032] Furthermore, for the drying of sawdust containing biogas slurry, segmented drying is adopted, that is, low-temperature preheating, high-temperature drying, and then medium-temperature drying. On the one hand, it avoids the waste of energy caused by poor temperature feedback of direct high-temperature drying materials, and on the other hand, it avoids long-term high-temperature drying, which causes the sawdust to be over-dried by high temperature in the second half of drying.

[0033] Specifically, the temperature of the second drying zone 42 is higher than that of the first drying zone 41, the temperature of the third drying zone 43 is set between the temperatures of the first drying zone 41 and the second drying zone 42, the first drying zone 41 is used to preheat the material, the second drying zone 42 is used to dry the material at high temperature, and the third drying zone 43 is used to dry the material at the end.

[0034] Furthermore, a toothed roller disturbance mechanism 11 is provided in both the first drying zone 41 and the second drying zone 42, the rotation axis of the toothed roller disturbance mechanism 11 is horizontally arranged, the bottom outer wall of the toothed roller disturbance mechanism 11 is arranged above the breathable conveyor belt 2, and the rotation direction of the bottom outer wall of the toothed roller disturbance mechanism 11 is the same as the material conveying direction.

[0035] In this way, the gear roller disturbance mechanism 11 is used to turn over the materials on the breathable conveyor belt 2 to prevent the bottom layer of materials from being difficult to dry.

[0036] Furthermore, a roller brush 10 is installed in the unloading section 5, and the roller brush 10 is arranged on the lower side of the feeding end of the breathable conveyor belt 2. The roller brush surface of the roller brush 10 is in contact with the breathable conveyor belt 2, and the rotation direction of the roller brush surface of the roller brush 10 is opposite to the moving direction of the breathable conveyor belt 2.

[0037] Therefore, the roller brush 10 scrapes the surface of the breathable conveyor belt 2 to prevent a large amount of material from adhering to the breathable conveyor belt 2 during unloading.

[0038] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat pump hot water combined dryer for biogas residue drying, characterized in that: It comprises a box body (1), wherein a breathable conveyor belt (2) for conveying materials is arranged inside the box body (1), and a loading part (3), a drying part (4) and a discharging part (5) are arranged in sequence inside the box body (1) along the material conveying direction; A feeding mechanism (6) is installed on the top of the feeding part (3); A water heat exchanger (7) is installed on the top surface of the drying section (4), and an exhaust fan (8) is connected to the bottom surface; the exhaust fan (8) is connected to the air inlet end of the water heat exchanger (7) through an evaporative condenser (9), and the exhaust end of the water heat exchanger (7) is connected to the inner cavity of the drying section (4); The discharge portion (5) is used to collect and discharge the material on the air-permeable conveyor belt (2).

2. A heat pump hot water combined dryer for biogas residue drying according to claim 1, characterized in that: The drying section (4) is provided with a first drying zone (41), a second drying zone (42) and a third drying zone (43) in sequence along the material conveying direction; the top surfaces of the first drying zone (41), the second drying zone (42) and the third drying zone (43) are all provided with the water heat exchanger (7); and the bottom surfaces of the first drying zone (41), the second drying zone (42) and the third drying zone (43) are all connected to the exhaust fan (8) respectively.

3. A heat pump hot water combined dryer for biogas residue drying according to claim 2, characterized in that: The temperature of the second drying zone (42) is higher than that of the first drying zone (41), and the temperature of the third drying zone (43) is set between the temperatures of the first drying zone (41) and the second drying zone (42). The first drying zone (41) is used to preheat the material, the second drying zone (42) is used to dry the material at a high temperature, and the third drying zone (43) is used to dry the material at the end.

4. A heat pump hot water combined dryer for biogas residue drying according to claim 2 or 3, characterized in that: A toothed roller disturbance mechanism (11) is provided in both the first drying zone (41) and the second drying zone (42); the rotation axis of the toothed roller disturbance mechanism (11) is arranged horizontally; the bottom outer wall of the toothed roller disturbance mechanism (11) is arranged above the air-permeable conveyor belt (2); and the rotation direction of the bottom outer wall of the toothed roller disturbance mechanism (11) is the same as the material conveying direction.

5. The heat pump hot water combined dryer for biogas residue drying according to claim 1, characterized in that: A roller brush (10) is installed in the discharge portion (5), and the roller brush (10) is arranged on the lower side of the feeding end of the breathable conveyor belt (2). The roller brush surface of the roller brush (10) is in contact with the breathable conveyor belt (2), and the rotation direction of the roller brush surface of the roller brush (10) is opposite to the moving direction of the breathable conveyor belt (2).

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