Negative pressure type grain dryer

Abstract

The utility model discloses a negative pressure type grain dryer, which comprises a tower body, a drying tower, a preheating tower, a drying device, a drying device and a drying device, and is characterized in that the tower body comprises a drying tower and a preheating tower; the air supply outlets and the air exhaust outlets are correspondingly formed in the two side walls of the drying tower; a wind scooper; one end of the hot air supply pipe is communicated to the wind scooper; the dust settling bin I is arranged between the drying tower and the preheating tower; a negative pressure fan I; an air inlet II of the cyclone separator I is communicated to an air outlet I of the negative pressure fan I through an air guide pipe II, and an air outlet II of the cyclone separator I is communicated to a plurality of air supply outlets I in the side wall of the preheating tower through an air guide pipe III; an elevator; and a dust settling bin II. And a plurality of discharge ports. According to the negative pressure type grain drying machine provided by the utility model, dust carried in airflow can be discharged after being settled and separated for multiple times through the dust settling bin I, the negative pressure fan I, the cyclone separator I and the dust settling bin II which are reasonably arranged around the tower body, so that environmental pollution is effectively avoided.

Description

Technical Field

[0001] The utility model relates to a negative pressure grain drying machine. Background Art

[0002] In order to facilitate grain storage, it is generally necessary to use a drying tower to carry out air supply and drying of wet grains. Existing drying towers generally use two air supply forms: positive pressure blasting or negative pressure exhaust, to quickly reduce the moisture content of grains and achieve the purpose of drying and preservation. Chinese patent application number 202311822818.7 discloses a continuous drying tower, including a drying bin, a material elevator arranged on the side of the drying bin for lifting materials to the feeding port of the drying bin, a left air guide bin and a right air guide bin relatively arranged on both sides of the drying bin, a hot air supply 1 connected to the left air guide bin, and a hot air supply 2 connected to the right air guide bin, the left air guide bin and the right air guide bin are respectively arranged along the height direction of the drying bin, and the drying bin is divided from top to bottom into an upper drying area, a lower drying area and a cold area. The hot air supply one is connected to the left air guide bin located in the cooling zone, and the hot air supply two is connected to the right air guide bin located in the upper drying zone. The cold air enters the cooling zone from the bottom of the right air guide bin and then passes through the cooling zone to enter the left air guide bin and mixes with the hot air output by the hot air supply one to form mixed air. The mixed air passes through the lower drying zone to the right air guide bin. The mixed air entering the right air guide bin flows upward and then mixes with the hot air from the hot air supply two and passes through the upper drying zone, and then is discharged from the left air guide bin. This recycling series structure saves heat energy and saves drying costs. However, it still has the following shortcomings. The continuous drying tower extracts the air with a large amount of dust after passing through the drying bin and directly discharges it into the surrounding environment, which is easy to cause great pollution to the environment. Utility Model Content

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described below.

[0004] Another object of the utility model is to provide a negative pressure grain dryer, which can perform multiple sedimentation and separation treatments on the dust carried in the airflow before discharging it through the dust sedimentation bin I, negative pressure fan I, cyclone separator I and dust sedimentation bin II reasonably arranged around the tower body, thereby effectively avoiding environmental pollution.

[0005] In order to achieve these purposes and other advantages according to the utility model, a negative pressure grain dryer is provided, comprising:

[0006] The tower body comprises a drying tower and a preheating tower arranged in parallel; a plurality of air supply ports and a plurality of air exhaust ports, which are correspondingly arranged on two side walls of the drying tower; an air guide cover, which is buckled on the plurality of air supply ports; a heating air duct, one end of which is connected to the air guide cover, and the other end of which is connected to the heating air supply device;

[0007] A dust settling bin I is arranged between the drying tower and the preheating tower. The dust settling bin I is a rectangular bin structure. The first side wall of the dust settling bin I facing the drying tower is connected to a plurality of exhaust ports. A louvered partition is vertically arranged in the middle of the dust settling bin I, and the louvered partition is inclined toward the plurality of air outlets.

[0008] Negative pressure fan Ⅰ, its air inlet Ⅰ is connected to the dust settling bin through air guide pipe Ⅰ;

[0009] The air inlet II of the cyclone separator I is connected to the air outlet I of the negative pressure fan I through the air guide pipe II, and the air outlet II of the cyclone separator I is connected to multiple air supply ports I on the side wall of the preheating tower through the air guide pipe III;

[0010] An elevator, the lower end of which is connected to the discharge port I at the bottom of the preheating tower, and the upper end of which is connected to the feed port II at the upper end of the drying tower; and

[0011] The dust settling bin II is a rectangular bin structure, and the first side wall of the dust settling bin II facing the preheating tower is connected to a plurality of exhaust ports I; a partition is vertically arranged in the middle of the dust settling bin II, and the lower end of the partition is not in contact with the bottom of the dust settling bin II; a plurality of exhaust ports are opened on the second side wall of the dust settling bin II and are arranged close to the top of the dust settling bin II, and the second side wall and the first side wall are correspondingly arranged on both sides of the partition.

[0012] Preferably, it further comprises: at least two dust collecting hoppers, which are respectively arranged at the bottom of dust settling bin I and dust settling bin II, and an openable and closable door is arranged at the bottom of any dust collecting hopper.

[0013] Preferably, from top to bottom, the drying tower includes a high-temperature drying section, a low-temperature drying section, a slow drying section and a cooling section, and a plurality of air supply ports and a plurality of air exhaust ports are correspondingly opened at the high-temperature drying section and the low-temperature drying section;

[0014] The air guide cover includes a high-temperature air guide cover and a low-temperature air guide cover which are separated and arranged from top to bottom;

[0015] The heating air duct includes a high-temperature air duct and a low-temperature air duct. The high-temperature air duct is correspondingly connected to the high-temperature air guide cover, and the low-temperature air guide cover is correspondingly connected to the low-temperature air duct.

[0016] Preferably, the bottom of the dust settling bin I extends to the cooling section near the drying tower; the bottom of the dust settling bin II extends to the bottom near the preheating tower.

[0017] Preferably, the cooling section also includes: a plurality of air supply ports II and a plurality of air exhaust ports II, which are correspondingly arranged on the side walls of the cooling section, and the plurality of air exhaust ports are connected to the air inlet of the heating air supply device through a duct IV; and a negative pressure fan II, which is arranged on the duct IV.

[0018] Preferably, the hot air supply device is a biomass hot air furnace.

[0019] The utility model at least has the following beneficial effects:

[0020] The drying tower is used to dry the wet grain with hot air, and the preheating tower is used to preheat the wet grain, so as to make full use of the waste heat of the air discharged from the drying tower, avoid heat energy waste, reduce the thermal stress of the grain during the drying process, reduce the occurrence of cracks and breakage, make the grain heated more evenly, improve the grain quality, and help improve the grain drying efficiency;

[0021] During the grain drying process, some impurities and a large amount of water vapor contained in the heated grain will be discharged with the air flow through multiple exhaust ports and then enter the dust settling bin I. The function of the dust settling bin I is to allow the dust particles in the dust-laden air flow to settle naturally with the help of gravity, and then fall to the bottom of the dust settling bin I, thereby achieving the purpose of preliminary dust collection; the louver-type partition is composed of multiple adjustable blades, and its working principle is to control the amount of airflow passing through and increase the collision area with the dust by adjusting the angle and opening degree of the blades, thereby further preventing the spread of dust and guiding the sedimentation of dust.

[0022] Negative pressure fan I is used to provide power for air flow, accelerate the air circulation speed between the drying tower and the preheating tower, and improve the drying efficiency;

[0023] The cyclone separator I is used to further separate the air discharged from the dust settling bin I from the gas and solid to obtain cleaner air with residual heat;

[0024] The elevator is used to send the preheated grain into the drying tower for further drying;

[0025] The air in the preheating tower will carry dust again when discharged. The dust settling bin II is used to carry out dust settling treatment on this part of the air. The air first contacts and collides with the partition, causing most of the dust to settle. After that, the air flows through the channel between the lower end of the partition and the bottom of the dust settling bin II, and is finally discharged from multiple exhaust ports. Since the multiple exhaust ports are arranged near the top of the dust settling bin II, a small amount of dust will further settle in the process of the airflow climbing from the bottom of the dust settling bin II to the top of the dust settling bin II, so as to achieve a better dust settling effect.

[0026] In summary, the negative pressure grain dryer provided by the utility model can perform multiple sedimentation and separation treatments on the dust carried in the airflow before discharging it through the dust sedimentation bin I, negative pressure fan I, cyclone separator I and dust sedimentation bin II reasonably arranged around the tower body, thereby effectively avoiding environmental pollution.

[0027] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of a negative pressure grain dryer according to an embodiment of the utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the preheating tower in one embodiment of the utility model;

[0030] Figure 3 This is a structural schematic diagram of a negative pressure grain dryer in another embodiment of the utility model;

[0031] Figure 4 It is a structural schematic diagram of a negative pressure grain dryer in another embodiment of the utility model. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0033] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0034] like Figure 1 , 2 As shown, the utility model provides a negative pressure grain drying machine, comprising:

[0035] The tower body comprises a drying tower 10 and a preheating tower 20 arranged in parallel; a plurality of air supply ports and a plurality of exhaust ports, which are correspondingly arranged on the two side walls of the drying tower; an air guide hood 101, which is buckled on the plurality of air supply ports; a heating air duct 102, one end of which is connected to the air guide hood, and the other end of the heating air duct is connected to the heating air device; a dust settling bin Ⅰ 30, which is arranged between the drying tower and the preheating tower, and the dust settling bin Ⅰ is a rectangular bin structure, and the first side wall of the dust settling bin Ⅰ facing the drying tower is connected to the plurality of exhaust ports; a louvered partition 301, which is vertically arranged in the middle of the dust settling bin Ⅰ, and the louvered partition is inclined toward the plurality of air outlets; a negative pressure fan Ⅰ 40, whose air inlet Ⅰ is connected to the dust settling bin through the air guide Ⅰ; a cyclone separator Ⅰ 50, whose air inlet Ⅱ It is connected to the air outlet I of the negative pressure fan I through the air duct II, and the air outlet II of the cyclone separator I is connected to the multiple air supply ports I201 on the side wall of the preheating tower through the air duct III; the elevator 60, the lower end of which is connected to the discharge port I at the bottom of the preheating tower, and the upper end of the elevator is connected to the feed port II at the upper end of the drying tower; and the dust settling bin II 70, which is a rectangular bin structure, and the first side wall of the dust settling bin II facing the preheating tower is connected to the multiple exhaust ports I202; the partition 701, which is vertically arranged in the middle of the dust settling bin II, and the lower end of the partition is not in contact with the bottom of the dust settling bin II; multiple exhaust ports 702, which are opened on the second side wall of the dust settling bin II and are arranged close to the top of the dust settling bin II, and the second side wall and the first side wall are correspondingly arranged on both sides of the partition.

[0036] In this scheme, the drying tower is used to pass hot air into the wet grain for drying, and the preheating tower is used to preheat the wet grain, so as to make full use of the waste heat of the air discharged from the drying tower, avoid waste of heat energy, and reduce the thermal stress of the grain during the drying process, reduce the occurrence of cracks, breakage, etc., make the grain heated more evenly, improve the grain quality, and help improve the grain drying efficiency;

[0037] During the grain drying process, some impurities and a large amount of water vapor contained in the heated grain will be discharged with the air flow through multiple exhaust ports and then enter the dust settling bin I. The function of the dust settling bin I is to allow the dust particles in the dust-laden air flow to settle naturally with the help of gravity, and then fall to the bottom of the dust settling bin I, thereby achieving the purpose of preliminary dust collection; the louver-type partition is composed of multiple adjustable blades, and its working principle is to control the amount of airflow passing through and increase the collision area with the dust by adjusting the angle and opening degree of the blades, thereby further preventing the spread of dust and guiding the sedimentation of dust.

[0038] Negative pressure fan I is used to provide power for air flow, accelerate the air circulation speed between the drying tower and the preheating tower, and improve the drying efficiency;

[0039] The cyclone separator I is used to further separate the air discharged from the dust settling bin I from the gas and solid to obtain cleaner air with residual heat;

[0040] The elevator is used to send the preheated grain into the drying tower for further drying;

[0041] The air in the preheating tower will carry dust again when discharged. The dust settling bin II is used to carry out dust settling treatment on this part of the air. The air first contacts and collides with the partition, causing most of the dust to settle. After that, the air flows through the channel between the lower end of the partition and the bottom of the dust settling bin II, and is finally discharged from multiple exhaust ports. Since the multiple exhaust ports are arranged near the top of the dust settling bin II, a small amount of dust will further settle in the process of the airflow climbing from the bottom of the dust settling bin II to the top of the dust settling bin II, so as to achieve a better dust settling effect.

[0042] In summary, the negative pressure grain dryer provided by the utility model can perform multiple sedimentation and separation treatments on the dust carried in the airflow before discharging it through the dust sedimentation bin I, negative pressure fan I, cyclone separator I and dust sedimentation bin II reasonably arranged around the tower body, thereby effectively avoiding environmental pollution.

[0043] like Figure 3 As shown, in a preferred embodiment, at least two dust collecting hoppers 80 are provided at the bottom of dust settling bin I and dust settling bin II, respectively, and a door that can be opened and closed is provided at the bottom of any dust collecting hopper. At least two dust collecting hoppers are used to collect settled dust, and the dust in at least two dust collecting hoppers can be cleaned regularly to ensure the dust settling effect.

[0044] like Figure 4 As shown, in a preferred embodiment, from top to bottom, the drying tower includes a high-temperature drying section 103, a low-temperature drying section 104, a slow drying section and a cooling section, and multiple air supply ports and multiple air exhaust ports are correspondingly opened at the high-temperature drying section and the low-temperature drying section; the air guide cover includes a high-temperature air guide cover 1011 and a low-temperature air guide cover 1012 that are separated and arranged from top to bottom; the heating air duct includes a high-temperature air duct 1021 and a low-temperature air duct 1022, and the high-temperature air duct is correspondingly connected to the high-temperature air guide cover, and the low-temperature air guide cover is correspondingly connected to the low-temperature air duct. The high-temperature air duct supplies relatively high-temperature hot air to the high-temperature drying section, and the low-temperature air duct supplies relatively low-temperature hot air to the low-temperature drying section. When the grain passes through the high-temperature drying section and the low-temperature drying section, high wind temperature and large air volume are used to rapidly precipitate the moisture of the grain with high moisture content and low temperature when it first enters the drying tower. The hot air has high efficiency, and the saturated exhaust gas can be quickly discharged out of the tower, greatly improving the drying efficiency. When the grain enters the slow drying section, it will undergo heat and moisture exchange, so that the heat from the surface of the grain is transferred to the inside, and the internal moisture moves to the surface, effectively reducing the crack rate. The cooling section is used to slowly cool down the dried grain and fully cool it.

[0045] In a preferred embodiment, the bottom of the dust settling bin I extends to the cooling section near the drying tower; the bottom of the dust settling bin II extends to the bottom near the preheating tower.

[0046] In a preferred embodiment, the cooling section further comprises: a plurality of air supply ports II and a plurality of air exhaust ports II, which are correspondingly arranged on the side wall of the cooling section, and the plurality of air exhaust ports are connected to the air inlet of the hot air supply device through a conduit IV; and a negative pressure fan II, which is arranged on the conduit IV. The air discharged from the cooling section may contain a small amount of dust or water vapor, which is directly introduced into the hot air device for full combustion, and can avoid being directly discharged into the surrounding environment.

[0047] In a preferred embodiment, the hot air supply device is a biomass hot air furnace.

[0048] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A negative pressure grain dryer, characterized in that: include: The tower body comprises a drying tower and a preheating tower arranged in parallel; A plurality of air supply ports and a plurality of air exhaust ports are correspondingly arranged on two side walls of the drying tower; An air guide cover is buckled on the multiple air outlets; a heating air duct, one end of which is connected to the air guide cover, and the other end of which is connected to the heating air device; A dust settling bin I is arranged between the drying tower and the preheating tower. The dust settling bin I is a rectangular bin structure. The first side wall of the dust settling bin I facing the drying tower is connected to a plurality of exhaust ports. A louvered partition is vertically arranged in the middle of the dust settling bin I, and the louvered partition is inclined toward the plurality of air outlets. Negative pressure fan Ⅰ, its air inlet Ⅰ is connected to the dust settling bin through air guide pipe Ⅰ; The air inlet II of the cyclone separator I is connected to the air outlet I of the negative pressure fan I through the air guide pipe II, and the air outlet II of the cyclone separator I is connected to multiple air supply ports I on the side wall of the preheating tower through the air guide pipe III; An elevator, the lower end of which is connected to the discharge port I at the bottom of the preheating tower, and the upper end of which is connected to the feed port II at the upper end of the drying tower; as well as The dust settling bin II is a rectangular bin structure, and the first side wall of the dust settling bin II facing the preheating tower is connected to a plurality of exhaust ports I; a partition is vertically arranged in the middle of the dust settling bin II, and the lower end of the partition is not in contact with the bottom of the dust settling bin II; a plurality of exhaust ports are opened on the second side wall of the dust settling bin II and are arranged close to the top of the dust settling bin II, and the second side wall and the first side wall are correspondingly arranged on both sides of the partition.

2. The negative pressure grain dryer according to claim 1, characterized in that: Also includes: At least two dust collecting hoppers are respectively arranged at the bottom of the dust settling bin I and the dust settling bin II, and an openable and closable door is arranged at the bottom of any dust collecting hopper.

3. The negative pressure grain dryer according to claim 1, characterized in that: From top to bottom, the drying tower includes a high-temperature drying section, a low-temperature drying section, a slow drying section and a cooling section, and multiple air supply ports and multiple air exhaust ports are correspondingly opened at the high-temperature drying section and the low-temperature drying section; The air guide cover includes a high-temperature air guide cover and a low-temperature air guide cover which are separated and arranged from top to bottom; The heating air duct includes a high-temperature air duct and a low-temperature air duct. The high-temperature air duct is correspondingly connected to the high-temperature air guide cover, and the low-temperature air guide cover is correspondingly connected to the low-temperature air duct.

4. The negative pressure grain dryer according to claim 3, characterized in that: The bottom of the dust settling bin I extends to the cooling section close to the drying tower; the bottom of the dust settling bin II extends to the bottom close to the preheating tower.

5. The negative pressure grain dryer according to claim 3, characterized in that: The cooling section also includes: A plurality of air supply ports II and a plurality of air exhaust ports II are correspondingly arranged on the side wall of the cooling section, and the plurality of air exhaust ports are connected to the air inlet of the heating air supply device through a conduit IV; The negative pressure fan II is arranged on the duct IV.

6. The negative pressure grain dryer according to claim 1, characterized in that: The hot air supply device is a biomass hot air furnace.

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