Micro-cyclone biomass hot air drying furnace

Abstract

The utility model discloses a micro rotational flow biomass hot air drying furnace, which relates to the technical field of biomass drying, and comprises a drying furnace, a feeding box arranged above the drying furnace, and a material preheating unit, a furnace body hollow interlayer is formed between the inner wall and the outer wall of the drying furnace, an air inlet pipe connected with the furnace body hollow interlayer is arranged on the outer wall of the drying furnace, and an air outlet pipe connected with the material preheating unit is arranged on the material preheating unit. The air inlet pipe is arranged on the furnace body hollow interlayer, the air inlet pipe is arranged on the air inlet pipe, the air heater is arranged on the air inlet pipe, and a micro-rotational-flow plate I is arranged on the inner wall of the drying furnace. By arranging the furnace body hollow interlayer, the micro-rotational-flow plate I, the snakelike guide plate and the flow dividing baffle, the flow dividing baffle can divide the drying space in the drying furnace into three areas, and materials to be dried are subjected to flow dividing drying; the materials are uniformly and fully dried, the drying path is arranged to be of a snake-shaped structure, the drying time of the materials in the drying furnace can be prolonged, and the drying effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of biomass drying, and in particular relates to a micro-cyclonic biomass hot air drying furnace. Background Art

[0002] my country produces a large amount of biomass waste every year, including wheat straw, rice straw, branches, leaves, bark, bagasse, sugarcane leaves, wood scraps, etc. These wastes can be transported to biomass power plants as a fuel source. However, the collected biomass waste is usually too humid. If it is directly sent to the biomass boiler for combustion, due to the low calorific value, the overall combustion efficiency of the biomass boiler will be low, resulting in low power generation efficiency of the biomass power plant. Therefore, the biomass needs to be dried before combustion. Traditional biomass drying methods mainly include natural drying and artificial drying. Natural drying is to place the biomass in a natural environment and use the heat and humidity in the air to dry it. This method is low-cost and simple to operate, but for a large amount of biomass waste, the drying time is long and is greatly affected by weather and environment, making it difficult to ensure the stability of the drying quality; artificial drying is to heat the biomass through heat energy or other energy sources to accelerate water evaporation and reduce humidity. Common artificial drying methods include hot air drying, microwave drying, vacuum drying, etc. These methods can complete the drying process in a shorter time, and the drying quality is relatively stable, but they require a lot of energy and are costly.

[0003] The main problems with the current biomass pellet drying technology are that the biomass pellets are in contact with the hot air for a short time, the heat drying is uneven, the particle size requirements are high, and the drop space is small, which results in low drying efficiency and high losses, thus greatly reducing the biomass utilization rate, resulting in a large waste of biomass resources. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a micro-cyclonic biomass hot air drying furnace, which can improve drying efficiency, save energy and be environmentally friendly.

[0005] The utility model solves the technical problem by adopting the following scheme: a micro-cyclone biomass hot air drying furnace, comprising a drying furnace, a feed box is arranged above the drying furnace, and a material preheating unit is also arranged, a hollow interlayer of the furnace body is formed between the inner and outer walls of the drying furnace, an air inlet pipe connected to the hollow interlayer of the furnace body is installed on the outer wall of the drying furnace, and an air heater is installed on the air inlet pipe, a micro-cyclone plate is arranged on the inner wall of the drying furnace, a plurality of serpentine guide plates are arranged in the drying furnace, a serpentine drying path is formed between adjacent serpentine guide plates, and a plurality of diversion baffles are arranged at the entrance of the drying furnace The plate and the diverter baffle divide the drying furnace into a plurality of material dropping spaces, and the material dropping spaces correspond to the drying paths; the material preheating unit comprises a hollow interlayer of a feed box arranged between the inner and outer walls of the feed box, and the inner wall of the feed box is provided with a micro-swirl plate 2, an air outlet is opened on the side wall of the drying furnace, an exhaust fan is installed on the outer side of the air outlet, and the output end of the exhaust fan is connected with the hollow interlayer of the feed box through an air duct, and an exhaust fan is provided above the side wall of the feed box; a material dispersion component located above the serpentine guide plate is provided in the drying furnace, and a material conveyor belt is provided at the bottom of the drying furnace.

[0006] Furthermore, the micro-cyclone plates on the front and rear inner walls of the drying furnace match and correspond to the drying path.

[0007] Furthermore, a motor 3 is installed in the drying furnace, and the output end of the motor 3 is connected to a rotating shaft 2 which is laterally rotated and sleeved at the bend of the drying path, and a material guide plate 2 which matches the drying path is provided on the rotating shaft 2.

[0008] Furthermore, the material dispersing assembly includes a motor 1 installed on the side of the drying furnace, and the output end of the motor 2 is connected to a rotating shaft 1 which is transversely rotated and sleeved in the drying furnace, and the rotating shaft 1 is provided with fan blades.

[0009] Furthermore, a second motor is installed on the side of the feed box, and an output end of the second motor is connected to a material guide shaft which is laterally fixedly sleeved on the material outlet of the feed box, and a material guide plate is provided on the material guide shaft.

[0010] Furthermore, a filter is provided in the air outlet.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] The utility model provides a hollow interlayer of the furnace body, a micro-cyclone plate, a serpentine guide plate and a diversion baffle. The diversion baffle can divide the drying space in the drying furnace into three areas, divert and dry the materials to be dried, and achieve uniform and sufficient drying of the materials. The drying path is set in a serpentine structure, which can extend the drying time of the materials in the drying furnace and improve the drying effect. When the materials are dried, a part of the hot air flow passes through the micro-cyclone plate directly into the drying path of the drying furnace, and the other part of the air flow remains in the hollow interlayer of the inner and outer walls of the drying furnace. The convection heat transfer method heats up the inner wall of the furnace, and the temperature of the drying space is increased by heat radiation, further improving the drying effect of the material. The hot air flowing through the micro-cyclone plate is used to dry the wet biomass particles, which can not only inhibit the escape of completely dried fine particles, but also has the characteristics of low particle size requirements and high drying efficiency. In addition, after the hot air enters the inner and outer wall interlayer of the drying furnace, the temperature of the drying space in the furnace is greatly increased due to the heat radiation effect, which increases the heat transfer efficiency, reduces the heat energy loss, and is easy to operate, greatly saving manpower, material and financial resources;

[0013] By arranging the material preheating unit, the second motor and the first guide plate, when the drying furnace is drying the biomass pellet material with hot air, the exhaust fan can draw the residual hot air in the drying furnace into the feed box, heat the inner wall of the feed box, and discharge it from the second micro-cyclone plate, so as to preliminarily preheat the wet biomass pellets to be dried in the feed box, which is beneficial to shorten the subsequent drying time and improve the efficiency of hot air drying of the biomass pellets. In addition, the second motor drives the first guide plate to rotate, so as to continuously add material into the drying furnace in a quantitative manner, so as to realize continuous drying of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 2 It is a front view cross-sectional structural schematic diagram of the utility model;

[0016] Figure 3 for Figure 2 The enlarged structural diagram at B in the middle;

[0017] Figure 4 for Figure 2 The enlarged structural diagram at A in the middle;

[0018] Figure 5 It is a schematic diagram of the structure of the micro-cyclone plate;

[0019] Figure 6 It is a partial front view cross-sectional structural schematic diagram of the utility model.

[0020] In the figure: 1. drying furnace; 2. hollow interlayer of furnace body; 3. micro-cyclone plate 1; 4. serpentine guide plate; 5. drying path; 6. feed box; 7. material preheating unit; 71. exhaust fan; 72. air guide duct; 73. micro-cyclone plate 2; 74. hollow interlayer of feed box; 75. air outlet; 76. filter; 77. exhaust fan; 8. diversion baffle; 9. material dispersion component; 91. motor 1; 92. rotating shaft 1; 93. fan blade; 10. air inlet duct; 11. air heater; 12. control switch; 13. material conveyor belt; 14. motor 2; 15. guide plate 1; 16. motor 3; 17. rotating shaft 2; 18. guide plate 2. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] See also Figure 1-6 The utility model provides a technical solution of a micro-cyclonic biomass hot air drying furnace: Example

[0023] according to Figure 1 and Figure 2 As shown, a feed box 6 is provided above the drying furnace 1, and three diverter baffles 8 are provided below the discharge port of the feed box 6 and at the entrance of the drying furnace 1. The three diverter baffles 8 divide the drying furnace 1 into a plurality of blanking spaces. A plurality of serpentine guide plates 4 are installed in the drying furnace 1, and a serpentine drying path 5 is formed between adjacent serpentine guide plates 4. There are three drying paths 5 in total and they correspond to the positions of the blanking spaces up and down. By providing three diverter baffles 8 and corresponding drying paths 5, the drying space in the drying furnace 1 can be divided into three areas, and the materials to be dried can be diverted and dried to achieve uniform and sufficient drying of the materials. Moreover, by providing the drying path 5 into a serpentine structure, the drying time of the materials in the drying furnace 1 can be extended, and the drying effect can be improved. Figure 4 As shown, a furnace body hollow interlayer 2 is formed between the inner and outer walls of the drying furnace 1, and an air inlet pipe 10 connected to the furnace body hollow interlayer 2 is installed on the outer wall of the drying furnace 1. A blower is provided on the air inlet pipe 10, and an air heater 11 is installed on the air inlet pipe 10. Under the action of the air preheater, the room temperature air can be heated to 70°C. A plurality of micro-swirl plates 3 are provided on the inner wall of the drying furnace 1. The structure of the micro-swirl plates is as shown in FIG. Figure 5As shown, the micro-cyclone plate can inhibit fine particles from escaping to the wall interlayer and causing blockage of the hot air outlet. At the same time, the micro-cyclone plate can promote the one-way transmission of hot air to the drying space. The hot air can smoothly enter the drying furnace 1 through the micro-cyclone plate holes, reducing environmental pollution and material loss. The micro-cyclone plates 3 on the front and rear inner walls of the drying furnace 1 match the structure of the drying path 5. The room temperature air enters the hollow interlayer of the drying furnace 1 after being heated by the air heater 11. A part of the hot air flow passes through the micro-cyclone plate 3 and directly enters the drying path 5 of the drying furnace 1, and the other part of the air flow remains in the hollow interlayer of the inner and outer walls of the drying furnace 1. The furnace body wall is heated by convection heat exchange, and the temperature of the drying space is increased by thermal radiation. The wet particles in the drying furnace 1 are heated. A material conveyor belt 13 is provided at the bottom of the drying furnace 1. The biomass particle material after hot air drying falls on the material conveyor belt 13 and is discharged to the outside of the drying furnace 1 in time, avoiding the accumulation of materials at the bottom of the equipment.

[0024] like Figure 2 and Figure 3 As shown, a material preheating unit 7 is provided on the drying furnace 1, including a hollow interlayer of the feed box 6 arranged between the inner and outer walls of the feed box 6, a micro-swirl plate 73 is provided on the inner wall of the feed box 6, an air outlet 75 is opened on the side wall of the drying furnace 1, and an exhaust fan 71 is installed on the drying furnace 1, the air inlet end of the exhaust fan 71 corresponds to the air outlet 75 of the drying furnace 1, and the air outlet end of the exhaust fan 71 is connected to the hollow interlayer of the feed box 6 through an air guide 72, and a micro-swirl plate 73 is provided on the inner wall of the feed box 6, and an air outlet 75 is provided on the side wall of the feed box 6. An exhaust fan 77 is installed. When the drying furnace 1 is drying the biomass granular material with hot air, the exhaust fan 71 can operate to draw the residual hot air in the drying furnace 1 after hot air drying into the feed box 6, heat the inner wall of the feed box 6, and discharge it from the micro-cyclone plate 2 73. The feed box 6 adopts a hollow inner and outer wall sandwich design. Before the material directly contacts the hot air in the drying furnace 1, the convection heat exchange effect generated by the recycled hot air and the inner wall of the feed box 6 and the discharged residual hot air can be used to heat the feed box 6. The moist biomass particles to be dried in the feed box 6 are preliminarily preheated before entering the drying furnace 1 for drying, which is conducive to the full drying of the material, shortens the drying time, and can improve the efficiency of the subsequent hot air drying of the biomass particles. Finally, the moist gas is discharged through the exhaust fan 77, and a filter screen 76 is installed in the air outlet 75. The filter screen 76 can prevent the biomass particle dust in the drying box from entering the exhaust fan 71 through the air outlet 75, causing the exhaust fan 71 or the air guide duct 72 to be blocked; a guide shaft is rotatably mounted at the outlet of the feed box 6, and the guide shaft is connected to the output end of the motor 2 14 installed on the side of the feed box 6, and a guide plate 15 is arranged on the guide shaft. The motor 2 14 controls the rotation of the guide shaft. Under the guiding action of the guide plate 15, the biomass particle material in the feed box 6 can be quantitatively and continuously guided to the drying furnace 1 for hot air drying, realizing the continuous feeding function of the material, so that the drying efficiency of the biomass material is improved.

[0025] When used specifically, the utility model is a micro-cyclone biomass hot air drying furnace. First, the air blower and the air heater 11 are controlled to operate, and the room temperature air is heated by the air heater 11 and then sent into the hollow interlayer of the drying furnace 1. A part of the hot air flow passes through the micro-cyclone plate 13 and directly enters the drying path 5 of the drying furnace 1. The other part of the air flow remains in the hollow interlayer of the inner and outer walls of the drying furnace 1. The temperature of the inner wall of the furnace body is increased by convection heat exchange, and the interior of the drying furnace 1 is preheated. Then, the biomass particle material to be dried enters through the feed box 6. In the drying furnace 1, when the material enters the drying furnace 1, the material is diverted by the diversion baffle 8, so that the biomass particles are diverted and fall into different drying paths 5 for hot air drying. The biomass particles move downward due to gravity in the drying path 5. In the process of falling, the material is dried by the hot air blown from the micro-cyclone plate 3 for dehumidification and drying. The air supply volume in the drying furnace 1 is determined according to the material humidity, equipment layout and inner wall heat. Finally, the dried biomass particle material falls on the material conveyor belt 13 and is transmitted to the outside of the drying furnace 1. Example

[0026] On the basis of the first embodiment, Figure 2 As shown, a material dispersion component 9 is provided in the drying furnace 1, and the material dispersion component 9 is located above the serpentine guide plate 4 and the drying path 5. A rotating shaft 92 is provided in the drying furnace 1 for horizontal rotation, and the end of the rotating shaft 92 is connected to the output end of a motor 91 installed on the side of the drying furnace 1, and fan blades 93 are arranged on the rotating shaft 92.

[0027] During specific use, the utility model is a micro-cyclone biomass hot air drying furnace. The material falling into the drying furnace 1 is first driven by a motor 91 to rotate the fan blades 93, and the granular material is dispersed along the width direction of the equipment by the fan blades 93. The dispersed material falls freely into the furnace cavity under the action of gravity and enters each drying path 5, which can increase the contact area between the material and the hot air, promote uniform drying of the material, and avoid uneven drying caused by material agglomeration. Example

[0028] On the basis of the first embodiment, Figure 6 As shown, a motor 3 16 is installed at the center position of the serpentine guide plate 4 in the drying furnace 1. The motor 3 16 is a double-axis motor. The output end of the motor 3 16 is laterally fixed with a rotating shaft 2 17 rotatably mounted at the turning point of the drying path 5, and the rotating shaft 2 17 is provided with a guide plate 2 18 matching the drying path 5.

[0029] During specific use, the utility model is a micro-cyclone biomass hot air drying furnace. When the biomass particle material falls and is dried in the drying path 5, since there are many turning points in the drying path 5 and the turning angles are small, the material may be blocked at the turning points of the drying path 5 during the falling process. At this time, the control motor 3 16 is operated to drive the guide plate 2 18 to rotate. The guide plate 2 18 can provide a material guiding effect at the turning point of the drying path 5, guide the biomass particles in the drying path 5 downward, so that the material can fall smoothly in the drying path 5, and prevent the material from being blocked.

[0030] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-cyclonic biomass hot air drying furnace, comprising a drying furnace, a feed box is provided above the drying furnace, and is characterized in that: It also includes a material preheating unit, a hollow interlayer of the furnace body is formed between the inner and outer walls of the drying furnace, an air inlet pipe connected to the hollow interlayer of the furnace body is installed on the outer wall of the drying furnace, and an air heater is installed on the air inlet pipe, a micro-vortex plate 1 is provided on the inner wall of the drying furnace, a plurality of serpentine guide plates are provided in the drying furnace, a serpentine drying path is formed between adjacent serpentine guide plates, a plurality of diversion baffles are provided at the entrance of the drying furnace, the diversion baffles divide the drying furnace into a plurality of blanking spaces, and the blanking spaces correspond to the drying paths; the material preheating unit includes a hollow interlayer of a feed box arranged between the inner and outer walls of the feed box, and a micro-vortex plate 2 is provided on the inner wall of the feed box, an air outlet is opened on the side wall of the drying furnace, an exhaust fan is installed on the outer side of the air outlet, and the output end of the exhaust fan is connected to the hollow interlayer of the feed box through the air guide pipe, and an exhaust fan is provided above the side wall of the feed box; a material dispersion component located above the serpentine guide plate is provided in the drying furnace, and a material conveyor belt is provided at the bottom of the drying furnace.

2. The micro-cyclonic biomass hot air drying furnace according to claim 1, characterized in that: The micro-cyclone plates on the front and rear inner walls of the drying furnace match and correspond to the drying path.

3. The micro-cyclonic biomass hot air drying furnace according to claim 1, characterized in that: A motor 3 is installed in the drying furnace, and the output end of the motor 3 is connected to a rotating shaft 2 which is laterally rotated and sleeved at the turning point of the drying path, and a material guide plate 2 matching the drying path is arranged on the rotating shaft 2.

4. The micro-cyclonic biomass hot air drying furnace according to claim 1, characterized in that: The material dispersing assembly comprises a motor 1 installed on the side of the drying furnace, the output end of the motor 2 is connected to a rotating shaft 1 which is transversely rotated and sleeved in the drying furnace, and fan blades are arranged on the rotating shaft 1.

5. The micro-cyclonic biomass hot air drying furnace according to claim 1, characterized in that: A second motor is installed on the side of the feed box, and an output end of the second motor is connected to a material guide shaft which is transversely fixedly sleeved on the material outlet of the feed box, and a material guide plate is provided on the material guide shaft.

6. The micro-cyclonic biomass hot air drying furnace according to claim 1, characterized in that: A filter is arranged in the air outlet.

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