Biomass pneumatic conveying device and using method thereof

Abstract

The invention provides a biomass pneumatic conveying device and a using method thereof. The biomass pneumatic conveying device comprises an air inlet channel, a main channel, a movable center air pipe, a discharging diffusion section and a discharging pipe which are coaxially arranged. A mixing chamber is arranged between the movable central air pipe and the discharging diffusion section; the movable central air pipe is arranged in the mixing chamber and moves back and forth along the axial direction; and the mixing chamber is connected with the blanking bin. The movable center air pipe capable of moving front and back in the axial direction meets the pneumatic conveying requirements of biomass materials with different densities, and the compatibility and flexibility of the pneumatic conveying device are improved; the main channel, the annular air channel and the bottom air channel form three paths of airflow, the turbulence intensity of gas-solid two-phase flow is remarkably enhanced, and efficient conveying of biomass materials is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass conveying devices, and particularly relates to a biomass pneumatic conveying device and a use method thereof. BACKGROUND

[0002] Biomass refers to various types of organic matter formed through photosynthesis, covering plants, animals, microorganisms and their metabolites (such as manure, straw, etc.), as the only organic carbon source in renewable energy, its core characteristics include renewability, wide distribution and potential for conversion into energy or materials. Biomass can be used as fuel to convert into electric energy and heat energy through direct combustion or gasification technology, such as biomass incineration power generation projects can replace fossil fuels, the CO2 released in the process of biomass energy utilization is balanced with the amount of absorption during the growth stage, achieving near-zero emission, thereby reducing carbon emissions of thermal power plants.

[0003] In the utilization of biomass, there are mainly two ways of mechanical conveying and pneumatic conveying, among which, mechanical conveying (such as belt, screw) is suitable for long-distance and large block materials, and has simple structure but is easy to wear; the pneumatic conveying pipeline is closed, flexible in layout, environmentally friendly and high in automation, which is the main direction of technical upgrading.

[0004] However, fibrous biomass materials such as straw, wood chips and rags are easy to entangle, and are easy to accumulate during the conveying process, thereby causing blockage, and when the moisture content of biomass particles is high, the adhesion force is increased, which is more likely to cause caking and pipe blockage, resulting in interruption of conveying.

[0005] CN215175197U discloses a biomass combustion power generation pneumatic conveying device, which comprises a Roots blower, a shredder, a belt conveyor, a transmitter, a conveying pipeline, a dust removal assembly and a boiler. The shredder performs shredding operation on the material, and then the shredded material is conveyed to the feed inlet of the transmitter through the belt conveyor. The air outlet of the Roots blower is in communication with the air inlet of the transmitter, and the material is brought into the dust removal assembly from the air outlet. After dust removal, the material is conveyed to the boiler through the conveying pipeline under the action of the air supplement assembly. By increasing the dust removal assembly and the air supplement assembly on the basis of the existing pneumatic conveying device, the mixed dust in the material is separated and collected. The filtered air is used for pneumatic conveying of the dust-removed material under the cooperation of the air supplement assembly, realizing the recycling of air, saving air, and ensuring the stability of pneumatic conveying.

[0006] CN117304949A discloses a biomass pyrolysis device pneumatic conveying feeding system, comprising: a gas supply unit for providing a stable carrier gas source for the pneumatic conveying feeding system; a material fluidization unit that fluidizes biomass material with carrier gas to ensure sufficient contact between the material and the carrier gas, achieving material drying; a material conveying and separating unit that uses dilute phase pneumatic conveying to convey and dry the biomass material, while performing gas-solid separation in a cyclone separator; and a pyrolysis utilization unit for performing a biomass material pyrolysis reaction, the product of which can be carrier gas (nitrogen) heating. Through this pneumatic conveying system, on the one hand, the biomass raw material is dried in the fluidization tank to improve its flowability, ensuring smoothness and stability of the feed; on the other hand, the biomass material is dried in the conveying pipeline to improve its flowability, ensuring the continuity and stability of the conveying, while reducing the conveying gas consumption and energy consumption.

[0007] CN109941760A discloses a biomass fuel pneumatic conveying device, comprising a pump, turbine blades and guide plates; a coupling is installed at the right end of the pump shaft; the right end of the coupling is connected to the bearing seat of the right end pedestal through a conveying shaft, and the connecting part between the coupling and the left end of the conveying shaft is also fixedly installed with a pedestal downward; the outer part of the conveying shaft between the two pedestals is covered with a cylindrical material conveying bin; an upper wide and lower narrow feed hopper is fixedly installed at the left end top of the material conveying bin. The setting of the conveying paddle and turbine blades in the biomass fuel pneumatic conveying device improves the conveying efficiency of biomass particles by setting double helical conveying paddles on the conveying shaft, further prevents material from returning, and in addition, the diameter of the booster bin is greater than that of the material conveying bin, so that the booster bin forms a larger inner cavity space, facilitating the material to be pushed to the right from the edge position by the rotating turbine blades.

[0008] However, the above biomass pneumatic conveying device cannot efficiently convey biomass materials of different densities, and also has the problems of poor equipment compatibility and flexibility. SUMMARY

[0009] In view of the problems in the prior art, the present application provides a biomass pneumatic conveying device and its use method, which sets an active center air pipe that can move forward and backward along the axial direction to meet the pneumatic conveying requirements of biomass materials of different densities, improves the compatibility and flexibility of the pneumatic conveying device, and sets a main channel, an annular air channel and a bottom air channel to form three air flows, significantly enhancing the turbulence intensity of gas-solid two-phase flow and realizing efficient conveying of biomass materials.

[0010] To achieve this purpose, the present application adopts the following technical solutions:

[0011] In a first aspect, the present application provides a biomass pneumatic conveying device, which comprises an air inlet channel, a main channel, a movable central air duct, a discharge diffuser section and a discharge pipe arranged coaxially; a mixing chamber is arranged between the movable central air duct and the discharge diffuser section; the movable central air duct moves forward and backward in the mixing chamber along the axial direction; and the mixing chamber is connected with a discharge bin.

[0012] The biomass pneumatic conveying device can adjust the position of the movable central air duct according to the density of the biomass material, so that the movable central air duct moves forward and backward in the mixing chamber along the axial direction. For the biomass material with large density, the movable central air duct is adjusted to be far away from the discharge diffuser section, so as to increase the air flow output and blow away the biomass material to prevent it from being blocked. For the biomass material with small density, the movable central air duct is adjusted to be close to the discharge diffuser section, so as to increase the ejecting effect and reduce the dust of the biomass material. The central air duct in the biomass pneumatic conveying device improves the biomass conveying compatibility and increases the flexibility of the conveying process system, so as to meet the conveying requirements of different biomass materials.

[0013] The air inlet channel, the main channel, the movable central air duct, the discharge diffuser section and the discharge pipe in the biomass pneumatic conveying device are arranged coaxially, which is beneficial to reducing the loss of gas flow rate.

[0014] Preferably, the air inlet nozzle of the movable central air duct has a tapered structure, which can improve the outlet air flow rate and reduce the wind pressure in the surrounding area, so as to facilitate the mixing of the biomass from the discharge bin outlet and the air flow.

[0015] Preferably, the movable central air duct is connected with an adjusting device, and the position of the movable central air duct and the discharge port is controlled by the adjusting device, so as to improve the material compatibility of the biomass pneumatic conveying device.

[0016] Preferably, oil seals are arranged at both ends of the movable central air duct, and the oil seals can be lubricated by adding oil into the movable central air duct box arranged outside the movable central air duct.

[0017] Preferably, a material level meter is arranged on the side of the discharge bin.

[0018] Preferably, the material level meter is connected with an alarm device, and when the size of the incoming biomass is too large to cause the blocking of the material in the mixing chamber, the alarm device sends an alarm and feeds back to the biomass conveying end to stop the biomass conveying.

[0019] Preferably, a clearing door is arranged at the lower part of the mixing chamber, which is used for equipment maintenance and cleaning of the residual biomass material in the mixing chamber.

[0020] Preferably, an air distribution plate is arranged at the bottom of the mixing chamber.

[0021] Preferably, the main channel is provided with an annular air channel and a bottom air channel between the main channel and the mixing chamber.

[0022] The annular air channel and the bottom air channel in the present application are both auxiliary air channels, which are used to enhance the air flow around the movable central air duct and prevent the existence of flow field dead zones in the mixing chamber to avoid the accumulation of biomass materials.

[0023] Preferably, the annular air channel is connected to the upper region of the air distribution plate in the mixing chamber through an annular air bellow.

[0024] Preferably, the bottom air channel is connected to the lower region of the air distribution plate in the mixing chamber, and the air outlet of the bottom air channel is directed towards the direction of the discharge bin, which is used to keep the biomass materials in a suspended state and prevent the deposition of biomass materials in the bottom of the mixing chamber to avoid blockage, and at the same time, the air outlet of the bottom air channel can form a turbulent flow with the air outlet of the movable central air duct to enhance the mixing of biomass and gas.

[0025] Preferably, an adjusting valve is arranged on the annular air channel and the bottom air channel, which can be used to flexibly adjust the air outlet of the annular air channel and the bottom air channel.

[0026] In the second aspect, the present application further provides a use method of the biomass pneumatic conveying device according to the first aspect, which comprises the following steps:

[0027] The external air source enters the mixing chamber through the inlet air channel, the main channel and the movable central air duct in sequence, and then mixes with the biomass materials entering the mixing chamber from the discharge bin to convey the biomass materials to the discharge expansion section and then discharge through the discharge pipe.

[0028] When the density of the biomass materials is less than 120 kg / m 3 , the distance between the top end of the movable central air duct and the discharge expansion section is 3 / 10 to 1 / 2 of the length of the mixing chamber.

[0029] When the density of the biomass materials is greater than 240 kg / m 3 , the distance between the top end of the movable central air duct and the discharge expansion section is 7 / 10 to 9 / 10 of the length of the mixing chamber.

[0030] The use method of the biomass pneumatic conveying device according to the present application is simple to operate, and the distance between the top end of the movable central air duct and the discharge expansion section can be flexibly adjusted according to the density of the biomass materials to ensure that the materials are kept in a stable suspended state during the conveying process, which improves the compatibility of biomass conveying, increases the flexibility of the process system, realizes the efficient pneumatic conveying of different biomass materials, avoids the blockage of the biomass materials during the conveying process, and realizes the continuous and stable conveying of biomass fuels.

[0031] In the present application, when the density of the biomass materials is less than 120 kg / m 3For example, it can be 119 kg / m 3 、115kg / m 3 、110kg / m 3 、105kg / m 3 、100kg / m 3 , 95kg / m 3 or 90kg / m 3 wait.

[0032] The distance between the top of the active central air duct and the discharge expansion section is 3 / 10 to 1 / 2 of the length of the mixing chamber, for example, it can be 3 / 10, 7 / 20, 19 / 50, 2 / 5, 9 / 20 or 1 / 2.

[0033] When the density of biomass material is greater than 240kg / m 3 For example, it can be 241kg / m 3 , 245kg / m 3 , 250kg / m 3 、255kg / m 3 , 260kg / m 3 , 270kg / m 3 or 280kg / m 3 wait.

[0034] The distance between the top of the active central air duct and the discharge diffuser section is 7 / 10 to 9 / 10 of the length of the mixing chamber, for example, it can be 7 / 10, 3 / 4, 4 / 5, 17 / 20 or 9 / 10.

[0035] Preferably, after the external air source enters the main channel, it is divided into two other paths and enters the mixing chamber through the annular air channel and the bottom air channel respectively.

[0036] The external wind source described in the present invention is divided into three airflows entering the mixing chamber. The annular wind forms an outer vortex, the bottom wind provides basic lifting force, and the central wind serves as the core conveying power. Through the synergistic effect of the three airflows, the turbulence intensity of the gas-solid two-phase flow is significantly enhanced, thereby achieving efficient transportation of biomass materials and reducing the occurrence of blockages.

[0037] Preferably, the distance between the top end of the movable central air duct and the discharge diffuser section is adjusted by an adjusting device.

[0038] As a preferred technical solution of the present invention, the method of use comprises the following steps:

[0039] The external air source enters from the air inlet channel and is divided into three air flows through the main channel. One air flow enters the active central air duct, and the other two air flows enter the mixing chamber through the annular air channel and the bottom air channel respectively. After mixing with the biomass material entering the mixing chamber from the lower hopper, the biomass material is transported to the discharge expansion section and discharged through the discharge pipe.

[0040] When the density of the biomass material is < 120 kg / m 3 the distance between the top end of the movable central air pipe and the discharge diffuser section is adjusted by the adjusting device to be 3 / 10-1 / 2 of the length of the mixing chamber;

[0041] When the density of the biomass material is > 240 kg / m 3 the distance between the top end of the movable central air pipe and the discharge diffuser section is adjusted by the adjusting device to be 7 / 10-9 / 10 of the length of the mixing chamber.

[0042] Compared with the prior art, the present application has at least the following beneficial effects:

[0043] (1) The biomass pneumatic conveying device provided by the present application improves the biomass conveying compatibility by arranging the central air pipe to move forward and backward along the axial direction, increases the process system flexibility, and meets the biomass pneumatic conveying requirements under different resource conditions;

[0044] (2) The biomass pneumatic conveying device provided by the present application is provided with three air inlet channels, effectively avoids the material blockage in the biomass pneumatic conveying process, realizes the continuous and stable feeding of the biomass, improves the process system stability, can reduce the cleaning operation, reduces the artificial maintenance cost and equipment downtime, and avoids the energy waste caused by frequent handling of the blockage problem. BRIEF DESCRIPTION OF DRAWINGS

[0045] Figure 1 is a structural schematic view of the biomass pneumatic conveying device in Embodiment 1 of the present application.

[0046] In the figure: 1-air inlet channel; 2-main channel; 31-annular air channel; 32-bottom air channel; 4-regulating valve; 5-movable central air pipe; 6-movable central air pipe box; 7-adjusting device; 8-annular air box; 9-air distribution plate; 10-cleaning door; 11-mixing chamber; 12- material level meter; 13-discharge bin; 14-discharge diffuser section; 15-discharge pipe. DETAILED DESCRIPTION

[0047] The technical solutions of the present application will be further described below in combination with the drawings and through specific embodiments.

[0048] The present application will be further described below. However, the following examples are only simple examples of the present application, and do not represent or limit the protection scope of the present application, and the protection scope of the present application is subject to the claims.

[0049] It should be understood that, in the description of the present application, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0050] It should be noted that, in the description of the present application, unless otherwise specified and limited, the terms "set", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] Those skilled in the art should understand that the present application necessarily includes necessary pipelines, conventional valves and general pump equipment for realizing the complete process, but the above content does not belong to the main point of the present application, and those skilled in the art can add layout by themselves based on process flow and equipment structure selection, and the present application does not make special requirements and specific limitations.

[0052] Example 1

[0053] The present embodiment provides a biomass pneumatic conveying device, a structural schematic diagram of which is shown in Figure 1 .

[0054] The biomass pneumatic conveying device comprises a coaxially arranged air inlet channel 1, a main channel 2, a movable central air pipe 5, a discharge diffuser section 14 and a discharge pipe 15; a mixing chamber 11 is arranged between the movable central air pipe 5 and the discharge diffuser section 14; the movable central air pipe 5 moves forward and backward in the mixing chamber 11 in the axial direction; the mixing chamber 11 is connected with a discharge bin 13.

[0055] The air inlet nozzle of the movable central air pipe 5 is of a tapered structure.

[0056] The movable central air pipe 5 is connected with an adjusting device 7;

[0057] The two ends of the active center air pipe 5 are provided with oil seals, and the oil seals are lubricated by adding lubricating oil into the active center air pipe box 6 which is sleeved outside the active center air pipe 5.

[0058] The side of the discharging bin 13 is provided with a material level meter 12.

[0059] The material level meter 12 is connected with an alarm device.

[0060] The lower part of the mixing chamber 11 is provided with a jam clearing door 10.

[0061] The bottom of the mixing chamber 11 is provided with a wind distribution plate 9.

[0062] The main channel 2 and the mixing chamber 11 are provided with an annular air channel 31 and a bottom air channel 32.

[0063] The annular air channel 31 is connected with the upper area of the wind distribution plate 9 in the mixing chamber 11 through an annular air box 8.

[0064] The bottom air channel 32 is connected with the lower area of the wind distribution plate 9 in the mixing chamber 11.

[0065] The annular air channel 31 and the bottom air channel 32 are both provided with adjusting valves 4.

[0066] Example 2

[0067] The embodiment provides a use method of the biomass pneumatic conveying device as described in the embodiment 1, and the use method comprises the following steps:

[0068] The external air source enters from the air inlet channel 1, is divided into three air flows through the main channel 2, one air flow enters the active center air pipe 5, and the other two air flows enter the mixing chamber 11 through the annular air channel 31 and the bottom air channel 32 respectively; after being mixed with the biomass material entering the mixing chamber 11 from the discharging bin 13, the biomass material is conveyed to the discharging diffuser section 14 and is discharged through the discharging pipe 15.

[0069] The density of the biomass material is 100 kg / m 3 The distance between the top end of the active center air pipe 5 and the discharging diffuser section 14 is adjusted by the adjusting device 7 to be 2 / 5 of the length of the mixing chamber 11.

[0070] Example 3

[0071] The embodiment provides a use method of the biomass pneumatic conveying device as described in the embodiment 1, and the use method comprises the following steps:

[0072] The external air source enters from the air inlet channel 1, is divided into three air flows through the main channel 2, one of which enters the movable central air pipe 5, and the other two respectively pass through the annular air channel 31 and the bottom air channel 32 to enter the mixing chamber 11; after being mixed with the biomass material entering the mixing chamber 11 from the feeding bin 13, the biomass material is transported to the discharge diffuser section 14 and is discharged through the discharge pipe 15;

[0073] The density of the biomass material is 260 kg / m 3 The distance between the top end of the movable central air pipe 5 and the discharge diffuser section 14 is adjusted by the adjusting device 7 to be 3 / 4 of the length of the mixing chamber 11.

[0074] In summary, the biomass pneumatic conveying device provided by the application can efficiently convey biomass materials with different densities by arranging the central air pipe to move forward and backward along the axial direction, improves the compatibility of biomass conveying, increases the flexibility of the pneumatic conveying process system, effectively avoids the blockage of biomass during the pneumatic conveying process by arranging three air inlet channels, realizes the continuous and stable feeding of biomass, improves the stability of the process system, reduces the cleaning operation, reduces the labor maintenance cost and equipment downtime, and is suitable for wide application.

[0075] The applicant declares that the detailed structural features of the application are illustrated by the above-mentioned embodiments, but the application is not limited to the above-mentioned detailed structural features, that is, it does not mean that the application must rely on the above-mentioned detailed structural features to be implemented. It should be understood by those skilled in the art that any improvement of the application, equivalent replacement of the components selected by the application and increase of auxiliary components, selection of specific modes, etc. fall within the protection scope and disclosure scope of the application.

[0076] The preferred embodiments of the application are described in detail above, but the application is not limited to the specific details in the above-mentioned embodiments, and within the technical concept scope of the application, the technical solutions of the application can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the application.

Claims

1. A biomass pneumatic conveying device, characterized in that: The biomass pneumatic conveying device includes a coaxially arranged air inlet channel, a main channel, a movable central air duct, a discharge diffuser section and a discharge pipe; a mixing chamber is provided between the movable central air duct and the discharge diffuser section; the movable central air duct moves axially back and forth in the mixing chamber; and the mixing chamber is connected to the lower hopper.

2. The biomass pneumatic conveying device according to claim 1, characterized in that: The air inlet nozzle of the movable central air duct is a tapered structure.

3. The biomass pneumatic conveying device according to claim 1 or 2, characterized in that: The movable central air duct is connected to the adjustment device; Preferably, oil seals are provided at both ends of the movable central air duct.

4. The biomass pneumatic conveying device according to any one of claims 1 to 3, characterized in that: A material level meter is provided on the side of the lower silo; Preferably, the material level meter is connected to an alarm device.

5. The biomass pneumatic conveying device according to any one of claims 1 to 4, characterized in that: A clearing door is provided at the lower part of the mixing chamber.

6. The biomass pneumatic conveying device according to any one of claims 1 to 5, characterized in that: An air distribution plate is provided at the bottom of the mixing chamber.

7. The biomass pneumatic conveying device according to any one of claims 1 to 6, characterized in that: An annular air channel and a bottom air channel are provided between the main channel and the mixing chamber; Preferably, the annular air channel is connected to the upper area of ​​the air distribution plate in the mixing chamber via an annular air box; Preferably, the bottom air channel is connected to the lower area of ​​the air distribution plate in the mixing chamber.

8. The biomass pneumatic conveying device according to claim 7, characterized in that: The annular air channel and the bottom air channel are both provided with regulating valves.

9. A method for using the biomass pneumatic conveying device according to any one of claims 1 to 8, characterized in that: The method of use comprises the following steps: The external air source enters from the air inlet channel, and enters the mixing chamber through the main channel and the active center air duct in sequence; after being mixed with the biomass material entering the mixing chamber from the lower hopper, the biomass material is transported to the discharge expansion section and discharged through the discharge pipe; When the density of biomass material is less than 120kg / m 3 When the distance between the top of the movable central air duct and the discharge expansion section is 3 / 10 to 1 / 2 of the length of the mixing chamber; When the density of biomass material is greater than 240kg / m 3 When the mixing chamber is opened, the distance between the top end of the movable central air duct and the discharge expansion section is 7 / 10 to 9 / 10 of the length of the mixing chamber.

10. The method of use according to claim 9, characterized in that: After the external air source enters the main channel, it is divided into two other paths and enters the mixing chamber through the annular air channel and the bottom air channel respectively; Preferably, the distance between the top end of the movable central air duct and the discharge diffuser section is adjusted by an adjusting device.

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