Biogas residue feeding system and biogas residue drying system

Abstract

The utility model relates to the technical field of biogas residue drying treatment, provide a kind of biogas residue feeding system and biogas residue drying system. Biogas residue feeding system includes wet material bin, back powder hopper, mixing bin and paving assembly;The wet material bin is used to store wet material, and the discharge port of the wet material bin is equipped with spiral discharge device;The feed inlet of the back powder hopper is configured to communicate with the undersize side of drying end, and the back powder hopper is used to store dry powder, and the feed inlet of the back powder hopper is equipped with spiral feeding device;The discharge port of the wet material bin and the discharge port of the back powder hopper are both communicated with the mixing bin, and the mixing bin is used to mix wet material and dry powder;The paving assembly includes paving conveyor belt, and the paving conveyor belt is connected with the discharge end of the mixing bin. The utility model solves the defect that the existing belt drying feeding technology cannot respond to raw material fluctuation in real time due to "single-point feeding + offline return mixing", resulting in arching in the bin, uneven belt surface, energy consumption rising and uncontrolled moisture content of discharge.

Description

Technical Field

[0001] This utility model relates to the field of biogas residue drying treatment technology, and in particular to a biogas residue feeding system and a biogas residue drying system. Background Technology

[0002] Belt drying is a conventional process for reducing and recycling biogas residue. Existing production lines generally use a "single spiral + simple spreading" or "belt + scraper" mode at the feed end, which is extremely sensitive to changes in moisture content, particle size distribution, and rheological properties. To suppress the impact of raw material fluctuations on drying efficiency, current technologies typically maintain capacity through "passive compensation" methods such as increasing hot air temperature and air volume, leading to a significant increase in energy consumption, and the output moisture content still exhibits periodic fluctuations. Furthermore, although some production lines include a remixing stage, it is mostly manual or offline operation, failing to form a closed loop with online moisture detection signals. The lack of fixed-ratio batching and uniform distribution results in issues such as easy arching within the silo, uneven belt thickness, limited hot air penetration, and persistent system instability. Utility Model Content

[0003] This utility model provides a biogas residue feeding system and a biogas residue drying system to solve the defects of existing belt drying and feeding technology, which cannot respond to raw material fluctuations in real time due to "single-point feeding + offline back mixing", resulting in arching in the bin, uneven belt surface, increased energy consumption and uncontrolled output moisture content.

[0004] This utility model provides a biogas residue feeding system, including: a wet material bin, a return powder hopper, a mixing bin, and a paving component.

[0005] The wet material silo is used to store wet material, and the outlet of the wet material silo is equipped with a screw discharge device; the inlet of the return powder hopper is configured to communicate with the underside of the drying end, the return powder hopper is used to store dry powder, and the inlet of the return powder hopper is equipped with a screw feed device; the outlets of the wet material silo and the return powder hopper are both connected to the mixing silo, the mixing silo is used to mix wet material and dry powder; the paving assembly includes a paving conveyor belt, the paving conveyor belt is connected to the outlet end of the mixing silo.

[0006] According to the biogas residue feeding system provided by this utility model, the outlet end of the screw discharge device is provided with a first weighing device, and the outlet end of the return powder hopper is provided with a second weighing device.

[0007] According to the biogas residue feeding system provided by this utility model, the wet material bin is equipped with a first moisture probe, which is used to detect the original moisture content of the wet material; the mixing bin is equipped with a second moisture probe, which is used to detect the moisture content of the wet material after mixing with the dry material; and the discharge end of the paving conveyor belt is equipped with a third moisture probe, which is used to detect the moisture content of the material entering the belt dryer.

[0008] According to the biogas residue feeding system provided by this utility model, the first moisture probe is located at the inlet of the wet material silo; and / or, the second moisture probe is located on the inner wall of the mixing silo.

[0009] According to the biogas residue feeding system provided by this utility model, the paving assembly further includes a sealing cover and a negative pressure device. The sealing cover is disposed on the paving conveyor belt to form a sealed cavity between the paving conveyor belt and the sealing cover. The negative pressure device is connected to the sealed cavity.

[0010] According to the biogas residue feeding system provided by this utility model, the top of the return powder hopper is equipped with a dust removal filter cylinder.

[0011] According to the biogas residue feeding system provided by this utility model, the top of the wet material silo is provided with an inspection door and / or an observation window.

[0012] According to the biogas residue feeding system provided by this utility model, the wet material bin is equipped with a stirring device for stirring the wet material.

[0013] The biogas residue feeding system provided by this utility model further includes: a control cabinet, wherein the screw discharge device and the screw feed device are both communicatively connected to the control cabinet.

[0014] Another aspect of this utility model provides a biogas residue drying system, including: a biogas residue feeding system and a belt dryer, wherein the discharge end of the paving conveyor belt is connected to the feed end of the belt dryer.

[0015] The biogas residue feeding system and biogas residue drying system provided by this utility model can accurately control the amount of wet material and dry powder entering the mixing bin by setting a screw discharge device at the outlet of the wet material bin and a screw feed device at the inlet of the return powder hopper. By controlling the rotation speed of the screw discharge device and the screw feed device respectively, the amount of wet material and dry powder entering the mixing bin can be accurately controlled, and the mixing ratio of wet material and dry powder can be accurately controlled, thereby reducing the fluctuation of discharge and energy consumption.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1This is a schematic diagram of the biogas residue feeding system provided in an embodiment of this utility model.

[0019] Figure 2 This is a schematic diagram of the control strategy of the biogas residue feeding system provided in this embodiment of the utility model.

[0020] Figure label: 100. Wet hopper; 110. Screw discharge device; 120. First weighing device; 130. First moisture probe; 200. Return powder hopper; 210. Screw feeder; 220. Second weighing device; 300. Mixing hopper; 310. Second moisture probe; 400. Paving assembly; 410. Paving conveyor belt; 420. Third moisture probe; 430. Sealing cover; 440. Negative pressure device. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0024] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The following is combined Figure 1 and Figure 2 This invention describes the biogas residue feeding system and biogas residue drying system provided by this utility model.

[0027] See Figure 1 As shown, the biogas residue feeding system provided in this embodiment includes: a wet material bin 100, a return powder hopper 200, a mixing bin 300, and a paving assembly 400.

[0028] The wet material silo 100 is used to store wet material, and the outlet of the wet material silo 100 is equipped with a screw discharge device 110; the inlet of the return powder hopper 200 is configured to communicate with the underside of the drying end, the return powder hopper 200 is used to store dry powder, and the inlet of the return powder hopper 200 is equipped with a screw feed device 210; the outlets of the wet material silo 100 and the return powder hopper 200 are both connected to the mixing silo 300, the mixing silo 300 is used to mix wet material and dry powder; the paving assembly 400 includes a paving conveyor belt 410, which is connected to the outlet end of the mixing silo 300.

[0029] The biogas residue feeding system provided by this utility model, by setting a screw discharge device 110 at the discharge port of the wet material silo 100 and a screw feed device 210 at the inlet of the return powder hopper 200, can accurately control the amount of wet material and dry powder entering the mixing silo 300 by controlling the rotation speed of the screw discharge device 110 and the screw feed device 210 respectively, and accurately control the mixing ratio of wet material and dry powder, thereby reducing discharge fluctuations and energy consumption fluctuations.

[0030] Specifically, the wet hopper 100 is used to store wet material. The return powder hopper 200 is used to store dry powder, collecting and storing the undersize material (usually dry powder) from the drying process for use in subsequent mixing processes. It is typically connected to the end of the drying equipment to receive the dried powder material. The main function of the mixing hopper 300 is to uniformly mix the wet material in the wet hopper 100 and the dry powder in the return powder hopper 200 in a specific ratio to meet subsequent production needs. The paving assembly 400 is used to evenly spread the mixed material onto the paving conveyor belt 410.

[0031] The wet material silo 100 has a screw discharge device 110 at its outlet, and the return powder hopper 200 has a screw feeder 210 at its inlet. By controlling the rotational speed and flow rate of the screw discharge device 110 and the screw feeder 210, the mixing ratio of wet material and dry powder can be precisely adjusted to ensure uniform material flow and efficient conveying. The screw discharge device 110 is responsible for uniformly conveying the wet material from the wet material silo 100 to the mixing hopper 300, while the screw feeder 210 quantitatively feeds the dry powder from the return powder hopper 200 into the mixing hopper 300. The rotational speeds of the screw discharge device 110 and the screw feeder 210 can be adjusted by a frequency converter. The frequency converter can adjust the motor speed according to actual needs, thereby precisely controlling the material conveying speed.

[0032] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the outlet end of the screw discharge device (W1) 110 is provided with a first weighing device 120, and the outlet end of the return powder hopper 200 is provided with a second weighing device (W2) 220.

[0033] By setting a first weighing device 120 at the outlet end of the screw discharge device 110 and a second weighing device 220 at the outlet end of the return powder hopper 200, the wet material and dry powder can be independently and in real time detected by the first weighing device 120 and the second weighing device 220 respectively. The actual discharge volume can be obtained directly without relying on the speed-flow empirical model. After the two weighing signals are fed back to the control system, the screw speed can be dynamically adjusted to realize the closed-loop fixed ratio batching of wet material and return powder according to the set ratio, improve the mixing ratio accuracy, reduce the ratio deviation caused by the fluctuation of material properties, and provide a reliable quality benchmark for the subsequent linkage control of moisture probe.

[0034] Specifically, the first weighing device 120 is located at the outlet end of the screw discharge device 110 and is used to continuously weigh the wet material, feeding back the actual discharge amount to the control system in real time, forming an independent metering loop. This ensures that the wet material flow rate is no longer affected by empirical errors in rotational speed and density, providing a stable quality benchmark for subsequent proportional mixing. The second weighing device 220 is located at the outlet end of the return powder hopper 200 and continuously weighs the returned powder, outputting a dry powder flow signal in real time. In conjunction with the first weighing device 120, it achieves synchronous metering and closed-loop regulation of the two materials, ensuring that the returned powder is accurately added according to the set ratio.

[0035] Both the first weighing device 120 and the second weighing device 220 can adopt a loss-in-weight or incremental weighing module. They are connected to the upstream and downstream via a bellows soft connection. While maintaining a sealed and vibration-isolated environment, they can detect changes in material mass in real time and feed the signal back to the control system, thereby realizing independent metering and closed-loop regulation of wet materials and dry powder.

[0036] See Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, a first moisture probe (M1) 130 is provided in the wet material bin 100, which is used to detect the original moisture content of the wet material; a second moisture probe (M2) 310 is provided in the mixing bin 300, which is used to detect the moisture content of the wet material after mixing with the dry material; a third moisture probe (M3) 420 is provided at the discharge end of the paving conveyor belt 410, which is used to detect the moisture content of the material entering the belt dryer.

[0037] By installing a first moisture probe 130 in the wet material silo 100, a second moisture probe 310 in the mixing silo 300, and a third moisture probe 420 at the discharge end of the paving conveyor belt 410, the system can acquire the material moisture content step by step along the process chain. Specifically, the first probe provides a feedforward signal for the original wet material moisture content, the second probe verifies whether the moisture content after mixing reaches the target range, and the third probe performs a final check before the material enters the dryer. The linkage of these three signals allows for timely correction of the amount of recycled powder added or the amount of wet material fed, achieving closed-loop stable control of the mixed moisture content and the discharge moisture content.

[0038] The first moisture probe 130, the second moisture probe 310, and the third moisture probe 420 can all detect the moisture content of materials online using near-infrared or microwave principles.

[0039] According to some embodiments of the present invention, a first moisture probe 130 is disposed at the inlet of the wet material silo 100, and a second moisture probe 310 is disposed on the inner side wall of the mixing silo 300.

[0040] By placing the first moisture probe 130 at the inlet of the wet material silo 100, the original moisture content of the wet material can be obtained in real time at the initial stage of the material entering the system, providing a feedforward basis for the subsequent addition of powder; the second moisture probe 310 is placed on the inner wall of the mixing silo 300, close to the stirring area, and can monitor the moisture content of the wet material and dry powder after mixing in real time, determine whether the mixing ratio reaches the target range, and realize closed-loop regulation of the process.

[0041] See Figure 1 As shown, according to some embodiments of the present invention, the paving assembly 400 further includes a sealing cover 430 and a negative pressure device 440. The sealing cover 430 covers the paving conveyor belt 410 to form a sealed cavity between the paving conveyor belt 410 and the sealing cover 430. The negative pressure device 440 communicates with the sealed cavity.

[0042] By setting up a sealing cover 430 and a negative pressure device 440, a local negative pressure environment can be formed above the paving conveyor belt 410, which can effectively suppress the escape of dust and odor generated by material turning, improve the operating environment and reduce the load of subsequent exhaust gas treatment.

[0043] Specifically, the sealing cover 430 is installed along the length of the paving conveyor belt 410, and labyrinth skirts and sealing brushes can be configured at both ends and sides to restrict air infiltration; the negative pressure device 440 can continuously draw air through the top slot suction port to maintain a slight negative pressure in the cavity, and the dust-laden airflow is concentrated and enters the rear purification unit to achieve source control of dust and odor.

[0044] According to some embodiments of the present invention, a dust removal filter cartridge is provided on the top of the dust return hopper 200.

[0045] By installing a dust filter cartridge at the top of the powder return hopper 200, dust carried by the airflow can be intercepted when dry powder enters the hopper, balancing the air pressure inside the hopper, preventing dust from escaping, and maintaining a clean working environment.

[0046] According to some embodiments of the present invention, the top of the wet material silo 100 is provided with an inspection door and / or an observation window (not shown in the figure).

[0047] By installing an inspection door and / or observation window on the top of the wet silo 100, the material level can be quickly checked, accumulated material can be cleared, or blockages can be dealt with without dismantling the silo, thus shortening downtime and reducing maintenance intensity.

[0048] According to some embodiments of the present invention, the wet material bin 100 is provided with a stirring device (not shown in the figure) for stirring the wet material.

[0049] By installing a stirring device inside the wet material silo 100, the wet material can be continuously turned over, the fiber bundles can be cut off, the silo wall can be arched and the center can be bridged, the material can be ensured to fall evenly, and a stable material flow can be provided for the screw discharge device 110.

[0050] According to some embodiments of the present invention, the biogas residue feeding system further includes: a control cabinet (not shown in the figure), and the screw discharge device 110 and the screw feed device 210 are both communicatively connected to the control cabinet.

[0051] By setting up a control cabinet, the start / stop, speed, weighing, and moisture signals of the screw discharge device 110 and the screw feed device 210 can be centrally connected, realizing automatic proportioning of the two feeds, fault alarms, and one-button operation, thereby improving the system's operational stability and ease of operation.

[0052] The following describes two embodiments of the biogas residue feeding system provided by this utility model.

[0053] Example 1: (500kg / h test line).

[0054] The initial moisture content of the wet material was 60% ± 3%, and the recycled powder was the powder passing through the end sieve (particle size ≤ 3mm), with a recycled powder ratio set at 10%. W1 / W2 were the first weighing device 120 and the second weighing device 220, respectively, and M1 / M2 / M3 were the first moisture probe 130, the second moisture probe 310, and the third moisture probe 420, respectively. The roller gap was 1.5mm, the paving thickness was 20mm, and the airflow of the negative pressure suction hood was approximately 800m³ / h. The material was run continuously for 8 hours, and the uniformity of the paving, weighing deviation, and output moisture fluctuation were recorded.

[0055] The results showed that under a load of 500 kg / h, a recycled powder ratio of 10%, and a material thickness of 20 mm, the weighing ratio deviation did not exceed ±1%, the surface moisture fluctuation was significantly narrowed, the discharge moisture content was stabilized below 40%, and the uniformity of the layer was significantly improved. Example 2: (1.5t / h engineering modification).

[0056] The wet material moisture content fluctuates between 50% and 70%, and the recycled powder ratio is set in increments of 5% to 15%. The roller gap is adjustable from 0.8mm to 2.0mm, and the material thickness is 15mm to 25mm. Energy consumption and output indicators are statistically analyzed after 168 hours of continuous operation.

[0057] The results show that the engineering modification increased the load to 1.5t / h. Faced with the moisture content fluctuation of 50% to 70% of wet material, the unit power consumption of the back-end dryer was reduced by about 12% after 168 hours of continuous operation by adjusting the return powder in stages from 5% to 15%. The rate of material exceeding the standard was reduced from 8% to less than 2%, which verified the stability and energy-saving effect of the system.

[0058] The following describes the biogas residue drying system provided by this utility model. The biogas residue drying system described below can be referred to in correspondence with the biogas residue feeding system described above.

[0059] The biogas residue drying system provided in this embodiment includes: a biogas residue feeding system and a belt dryer (not shown in the figure), wherein the discharge end of the paving conveyor belt 410 is connected to the feed end of the belt dryer.

[0060] The biogas residue drying system provided by this utility model adopts the biogas residue feeding system described in any of the above embodiments to feed the belt dryer. Therefore, it can also accurately control the amount of wet material and dry powder entering the mixing bin 300, and accurately control the mixing ratio of wet material and dry powder, thereby reducing the fluctuation of output and reducing the fluctuation of energy consumption.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A biogas residue feeding system, characterized in that, include: A wet material silo, which is used to store wet materials, has a screw discharge device at its outlet. A powder return hopper, wherein the feed inlet of the powder return hopper is configured to communicate with the underside of the screen at the end of the drying process, the powder return hopper is used to store dry powder, and the feed inlet of the powder return hopper is equipped with a screw feeder. The mixing chamber is connected to both the outlet of the wet material hopper and the outlet of the return powder hopper. The mixing chamber is used to mix wet materials and dry powder. A paving assembly, the paving assembly including a paving conveyor belt connected to the discharge end of the mixing bin.

2. The biogas residue feeding system according to claim 1, characterized in that, The outlet end of the spiral discharge device is equipped with a first weighing device, and the outlet end of the return powder hopper is equipped with a second weighing device.

3. The biogas residue feeding system according to claim 1, characterized in that, The wet material bin is equipped with a first moisture probe, which is used to detect the original moisture content of the wet material. The mixing chamber is equipped with a second moisture probe, which is used to detect the moisture content of the wet material and the dry material after mixing. The discharge end of the paving conveyor belt is equipped with a third moisture probe, which is used to detect the moisture content of the material entering the belt dryer.

4. The biogas residue feeding system according to claim 3, characterized in that, The first moisture probe is located at the inlet of the wet material silo; And / or, the second moisture probe is located on the inner wall of the mixing chamber.

5. The biogas residue feeding system according to claim 1, characterized in that, The paving assembly also includes a sealing cover and a negative pressure device. The sealing cover is disposed on the paving conveyor belt to form a sealed cavity between the paving conveyor belt and the sealing cover. The negative pressure device is in communication with the sealed cavity.

6. The biogas residue feeding system according to claim 1, characterized in that, The top of the dust return hopper is equipped with a dust removal filter cartridge.

7. The biogas residue feeding system according to claim 1, characterized in that, The top of the wet silo is equipped with an inspection door and / or an observation window.

8. The biogas residue feeding system according to claim 1, characterized in that, The wet material silo is equipped with a stirring device for mixing wet materials.

9. The biogas residue feeding system according to claim 1, characterized in that, Also includes: The control cabinet is connected in communication with both the screw discharge device and the screw feed device.

10. A biogas residue drying system, characterized in that, include: The biogas residue feeding system as described in any one of claims 1 to 9; A belt dryer, wherein the discharge end of the paving conveyor belt is connected to the feed end of the belt dryer.

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