Biological drying device

Abstract

The utility model relates to a biological drying device which comprises a drying bin group, a cold exhaust pipe, a hot exhaust pipe, a multi-way valve, a tail gas heat exchanger and a tail gas circulating pipeline, each drying bin is connected with the cold exhaust pipe and the hot exhaust pipe through the multi-way valve, the multi-way valve is used for controlling connection and disconnection between the drying bins and any one of the cold exhaust pipe and the hot exhaust pipe, one end of the tail gas circulation pipeline is communicated with the hot exhaust pipe through the tail gas heat exchanger, and the other end of the tail gas circulation pipeline is communicated with the hot exhaust pipe through the tail gas heat exchanger. And the other end of the tail gas circulating pipeline is communicated with the plurality of drying bins. The biological drying device disclosed by the utility model can be used for improving the utilization efficiency of heat and has higher economic benefit.

Description

Technical Field

[0001] The utility model relates to the technical field of biological drying, in particular to a biological drying device. Background Art

[0002] Organic solid waste (such as domestic garbage and sludge) is characterized by large processing volumes and complex pollutant types. High-moisture organic solid waste has a low calorific value and is easily corrupted, making subsequent landfill and incineration treatment more difficult to control. Biodrying is a new biological treatment technology that utilizes the principles of aerobic fermentation. It offers the advantages of low energy consumption and the absence of external heating, making it a highly economical, energy-saving, and environmentally friendly drying technology.

[0003] However, in the related art, the waste heat recovery and utilization of the biological drying device is not sufficient, a lot of heat is lost during the heat exchange process, the heat utilization efficiency is low, and the economy is poor. Utility Model Content

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a biological drying device, which can improve the utilization efficiency of heat and has high economic benefits.

[0006] The biological drying device of an embodiment of the present utility model includes: a drying bin group, the drying bin group includes a plurality of drying bins arranged in parallel; a cold exhaust pipe, a hot exhaust pipe and a multi-way valve, each of the drying bins is connected to the cold exhaust pipe and the hot exhaust pipe through the multi-way valve, and the multi-way valve is used to control the conduction and shutdown of the drying bin and any one of the cold exhaust pipe and the hot exhaust pipe; an exhaust gas circulation pipeline, one end of the exhaust gas circulation pipeline is connected to the hot exhaust pipe, and the other end of the exhaust gas circulation pipeline is connected to the plurality of drying bins; an exhaust gas heat exchanger, the exhaust gas heat exchanger has a first heat exchange circuit and a second heat exchange circuit that can exchange heat with each other, one end of the first heat exchange circuit is connected to the hot exhaust pipe, and the other end of the first heat exchange circuit and the cold exhaust pipe are both connected to the odor treatment device, one end of the second heat exchange circuit is used to let in air, and the other end of the second heat exchange circuit is connected to the exhaust gas circulation pipeline.

[0007] According to the biological drying device of the embodiment of the present invention, since the multi-way valve is used to control the conduction and shutoff of the drying chamber and any one of the cold exhaust pipe and the hot exhaust pipe, when the temperature in the drying chamber is higher than the set threshold, the gas in the drying chamber can be introduced into the hot exhaust pipe through the multi-way valve, and then refluxed to each drying chamber through the exhaust gas circulation pipeline. When the exhaust temperature in the drying chamber is lower than the set threshold, the gas in the drying chamber is introduced into the cold exhaust pipe through the multi-way valve, so that the gas with a temperature lower than the set threshold does not participate in the exhaust gas circulation of the biological drying device, thereby avoiding the mixing of low-temperature exhaust gas and high-temperature exhaust gas, thereby enhancing the effect of waste heat recovery and utilization of the biological drying device, improving the heat utilization efficiency, and having higher economic benefits.

[0008] In some embodiments, the biological drying device also includes an odor treatment device for purifying harmful substances in the exhaust gas so that the exhaust gas meets emission standards.

[0009] In some embodiments, one end of the hot exhaust pipe is connected to the multi-way valve of each drying bin, and the other end of the hot exhaust pipe is connected to the exhaust gas heat exchanger; one end of the cold exhaust pipe is connected to the multi-way valve of each drying bin, and the other end of the cold exhaust pipe is connected to the odor treatment device.

[0010] In some embodiments, the biological drying device also includes a first valve and a second valve, the first valve is installed on the exhaust gas circulation pipeline, and the second valve is installed on the pipeline between the second heat exchange loop and the exhaust gas circulation pipeline, the first valve is used to control the flow of the circulating exhaust gas, and the second valve is used to control the flow of air.

[0011] In some embodiments, the biological drying device also includes several first temperature sensors and one second temperature sensor. The first temperature sensor is arranged on the pipeline between each of the drying bins and the multi-way valve, and the second temperature sensor is arranged on the pipeline between the first heat exchange circuit and the odor treatment device. When the detection temperature of the first temperature sensor is lower than the detection temperature of the second temperature sensor, the multi-way valve controls the drying bin to be connected to the cold exhaust pipe. When the detection temperature of the first temperature sensor is higher than the detection temperature of the second temperature sensor, the multi-way valve controls the drying bin to be connected to the hot exhaust pipe.

[0012] In some embodiments, the biological drying device also includes a controller and an air flow distributor, the exhaust gas circulation pipeline is connected to the multiple drying bins through the air flow distributor, the controller is electrically connected to the air flow distributor and the multi-way valve, and the controller is used to control the ventilation flow of each drying bin and the exhaust switching of the multi-way valve.

[0013] In some embodiments, the biological drying device further includes a demister, which is connected in series to the exhaust gas circulation pipeline and is used to remove condensed water in the exhaust gas circulation pipeline.

[0014] In some embodiments, the bio-drying device further includes a fan and a flow meter, wherein the fan is connected in series to the exhaust gas circulation pipeline, and the flow meter is provided at the air inlet end of the bio-drying device.

[0015] In some embodiments, the number of the drying chambers is three or more. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the process of the biological drying device of an embodiment of the present utility model.

[0017] Reference numerals:

[0018] 1. Drying warehouse;

[0019] 21. Cold exhaust pipe; 22. Hot exhaust pipe; 23. Exhaust gas circulation pipeline;

[0020] 31. Multi-way valve; 32. First valve; 33. Second valve;

[0021] 4. exhaust gas heat exchanger; 41. first heat exchange circuit; 42. second heat exchange circuit;

[0022] 51. First temperature sensor; 52. Second temperature sensor; 53. Odor treatment device; 54. Controller; 55. Air flow distributor; 56. Demister; 57. Fan; 58. Flow meter. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0024] Please refer to the following Figure 1 The biological drying device according to an embodiment of the present invention is described.

[0025] like Figure 1As shown, the biological drying device of the present embodiment includes: a drying chamber group, a cold exhaust pipe 21, a hot exhaust pipe 22, a multi-way valve 31, and an exhaust gas circulation pipeline 23. The drying chamber group includes multiple drying chambers 1 arranged in parallel. Each drying chamber 1 is connected to the cold exhaust pipe 21 and the hot exhaust pipe 22 via a multi-way valve 31. The multi-way valve 31 is used to control the conduction and shutoff between the drying chamber 1 and either the cold exhaust pipe 21 or the hot exhaust pipe 22. One end of the exhaust gas circulation pipeline 23 is connected to the hot exhaust pipe 22, and the other end of the exhaust gas circulation pipeline 23 is connected to multiple drying chambers 1.

[0026] It is understood that multiple drying bins 1 are connected in parallel to the cold exhaust pipe 21 and the hot exhaust pipe 22. The multi-way valve 31 can control the connection and disconnection between the exhaust port of the drying bin 1 and the cold exhaust pipe 21, and the multi-way valve 31 can also control the connection and disconnection between the exhaust port of the drying bin 1 and the hot exhaust pipe 22.

[0027] According to the biological drying device of the embodiment of the present invention, since the multi-way valve 31 is used to control the conduction and shutoff of the drying bin 1 and any one of the cold exhaust pipe 21 and the hot exhaust pipe 22, when the temperature in any drying bin 1 is higher than the set threshold, the gas of the corresponding drying bin 1 can be introduced into the hot exhaust pipe 22 through the multi-way valve 31, and then refluxed into each drying bin 1 through the exhaust gas circulation pipeline 23. When the exhaust temperature in the drying bin 1 is lower than the set threshold, the gas of the drying bin 1 is introduced into the cold exhaust pipe 21 through the multi-way valve 31, so that the gas with a temperature lower than the set threshold does not participate in the exhaust gas circulation of the biological drying device, thereby avoiding the mixing of low-temperature exhaust gas and high-temperature exhaust gas, thereby enhancing the waste heat recovery and utilization effect of the biological drying device, improving the heat utilization efficiency, and having higher economic benefits.

[0028] The biological drying device of the embodiment of the present utility model can reduce the pile heat required for water evaporation through multi-bin collaborative efficient waste heat recovery, thereby reducing the consumption of organic matter in the dried material, improving the fuel quality of the dried material, and making it have a higher calorific value and better combustion performance.

[0029] It is understandable that the material drying cycles of each drying bin 1 are staggered, and there are situations where some drying bins 1 are in a high-temperature period, while other drying bins 1 are in the early and late stages of drying. The exhaust gas discharged from the drying bin 1 in the high-temperature period has a higher temperature and has a higher waste heat recovery value, while the exhaust gas discharged from the drying bin 1 in the early and late stages of drying has a lower temperature and a lower waste heat recovery value. If the low-temperature exhaust gas is mixed with the high-temperature exhaust gas, the temperature of the high-temperature exhaust gas will be reduced, and the heat that can be recycled by the device will be reduced. Therefore, the biological drying device of the embodiment of the present utility model can avoid the mixing of low-temperature exhaust gas and high-temperature exhaust gas to enhance the waste heat recovery and utilization effect of the biological drying device, improve the heat utilization efficiency, and have higher economic benefits.

[0030] For example, the multi-way valve 31 is a three-way valve, which can be an automatic switching valve such as a steam three-way valve, an electric three-way valve, or other manually controlled three-way valve.

[0031] Optionally, the biological drying device further includes an exhaust gas heat exchanger 4 and an odor treatment device 53. The odor treatment device 53 is used to purify harmful substances in the exhaust gas so that the exhaust gas meets emission standards.

[0032] The exhaust gas heat exchanger 4 has a first heat exchange circuit 41 and a second heat exchange circuit 42 that can exchange heat with each other. One end of the first heat exchange circuit 41 is connected to the hot exhaust pipe 22, and the other end of the first heat exchange circuit 41 and the cold exhaust pipe 21 are both connected to the odor treatment device 53. One end of the second heat exchange circuit 42 is used to allow air to enter, and the other end of the second heat exchange circuit 42 is connected to the exhaust gas circulation pipeline 23.

[0033] It can be understood that a part of the exhaust gas flowing out from the hot exhaust pipe 22 is refluxed into each drying bin 1 through the exhaust gas circulation pipeline 23, and the other part of the exhaust gas is heat exchanged through the exhaust gas heat exchanger 4, and the heat after heat exchange can be returned to each drying bin 1 through the exhaust gas circulation pipeline 23. Therefore, the biological drying device of the embodiment of the present invention cooperates with the two waste heat recovery methods of "partial circulation of exhaust gas" and "exhaust gas-air heat exchange" to recover the waste heat generated by the drying bin 1, thereby further enhancing the waste heat recovery and utilization effect of the biological drying device and improving the heat utilization efficiency.

[0034] On the other hand, since the biological drying device of the embodiment of the present invention adopts the "partial circulation of exhaust gas" method to recover waste heat, compared with the solution of "exhaust gas-air heat exchange", it can reduce the amount of odor generated, reduce the operating costs of odor treatment facilities, and reduce the impact of biological drying operations on the environment.

[0035] Specifically, one end of the hot exhaust pipe 22 is connected to the multi-way valve 31 of each drying bin 1, and the other end of the hot exhaust pipe 22 is connected to the exhaust heat exchanger 4. One end of the cold exhaust pipe 21 is connected to the multi-way valve 31 of each drying bin 1, and the other end of the cold exhaust pipe 21 is connected to the odor treatment device 53. Therefore, each drying bin 1 can selectively pass exhaust gas into the hot exhaust pipe 22 or the cold exhaust pipe 21 through the multi-way valve 31.

[0036] It should be noted that the cold exhaust pipe 21 can directly pass the low-temperature exhaust gas into the odor purification device, or it can be connected to the outlet of the first heat exchange circuit 41 of the exhaust heat exchanger 4, so that the low-temperature exhaust gas and the exhaust gas after heat exchange are mixed and then passed together into the odor treatment device 53. The biological drying device of the embodiment of the present utility model adopts a combination of two waste heat recovery methods, with a simple structure and easy operation, and can improve the waste heat recovery effect compared to a single waste heat recovery method.

[0037] Optionally, the bio-drying device further includes a first valve 32 and a second valve 33. The first valve 32 is installed on the exhaust gas circulation pipeline 23, and the second valve 33 is installed on the pipeline between the second heat exchange loop 42 and the exhaust gas circulation pipeline 23. The first valve 32 is used to control the flow rate of the circulating exhaust gas, and the second valve 33 is used to control the flow rate of air. It is understood that the first valve 32 and the second valve 33 can be opened at variable degrees to control the flow rate of the exhaust gas circulation in the "partial exhaust gas recirculation" mode and the flow rate of air in the "exhaust gas-air heat exchange" mode, thereby precisely controlling the waste heat recovery process and ventilation flow rate of the bio-drying device.

[0038] Specifically, the biological drying device also includes several first temperature sensors 51 and one second temperature sensor 52. The first temperature sensors 51 are located in the pipeline between each drying chamber 1 and the multi-way valve 31, while the second temperature sensor 52 is located in the pipeline between the first heat exchange circuit 41 and the odor treatment device 53. When the temperature detected by the first temperature sensor 51 is lower than that detected by the second temperature sensor 52, the multi-way valve 31 controls the connection between the drying chamber 1 and the cold exhaust pipe 21. When the temperature detected by the first temperature sensor 51 is higher than that detected by the second temperature sensor 52, the multi-way valve 31 controls the connection between the drying chamber 1 and the hot exhaust pipe 22. It will be understood that the biological drying device of the embodiment of the present invention controls the timing of the valve plate switching of the multi-way valve 31 by comparing the detected temperatures of the first temperature sensor 51 and the second temperature sensor 52.

[0039] When the exhaust gas temperature from a drying bin 1 is higher than the exhaust gas temperature from the exhaust heat exchanger 4, the heat from the exhaust gas from that drying bin 1 is determined to be recoverable. If the exhaust gas temperature from a drying bin 1 is lower than the exhaust gas temperature from the exhaust heat exchanger 4, the waste heat contained in that exhaust gas cannot be recovered by the system. This improves the waste heat recovery efficiency of the biological drying device and increases energy utilization.

[0040] In other words, the above-mentioned exhaust method can prevent the low-temperature exhaust gas generated in the drying chamber 1 at the initial and final stages of drying from entering the waste heat recovery system, keeping the exhaust gas in the hot exhaust pipe 22 at a higher temperature, so that the biological drying device has a higher waste heat recovery efficiency.

[0041] Specifically, the biological drying device also includes a controller 54 and an airflow distributor 55. The exhaust gas circulation pipeline 23 is connected to the multiple drying bins 1 through the airflow distributor 55. The controller 54 is electrically connected to the airflow distributor 55 and the multi-way valve 31. The controller 54 is used to control the ventilation flow of each drying bin 1 and the exhaust switching of the multi-way valve 31. The controller 54 is electrically connected to the first temperature sensor 51 and the second temperature sensor 52. The controller 54 can automatically control the exhaust switching of the multi-way valve 31 based on the temperatures of the first temperature sensor 51 and the second temperature sensor 52. The controller 54 can also adjust the ventilation flow of each drying bin 1 through the controller 54, thereby improving the automation level of the biological drying device and saving manpower.

[0042] For example, the controller 54 may be an automatic control device such as a PLC controller 54 , a microcontroller 54 , or a distributed control system.

[0043] Optionally, the biological drying device also includes a demister 56, which is connected in series to the exhaust gas circulation pipeline 23. The demister 56 is used to remove condensed water in the exhaust gas circulation pipeline 23. The biological drying device of the embodiment of the present utility model can reduce the moisture content in the exhaust gas by providing the demister 56, which is beneficial to improving the drying efficiency of the drying bin 1 and shortening the drying cycle. The demister 56 can be a cyclone demister 56, a metal cyclone plate demister 56, a corrugated plate demister 56, etc. Alternatively, the demister 56 can be replaced with a moisture adsorber or a moisture absorber to eliminate droplets and water vapor in the gas, which is not limited in this application.

[0044] Optionally, the bio-drying device further includes a fan 57 and a flow meter 58. The fan 57 is connected in series to the exhaust gas circulation pipeline 23, and the flow meter 58 is located at the air inlet of the bio-drying device. It will be appreciated that the fan 57 is installed at the air inlet of the second heat exchange loop 42, and the flow meter 58 is used to detect the flow rate of gas in the exhaust gas circulation pipeline 23, thereby facilitating real-time monitoring of the exhaust gas circulation in the exhaust gas circulation pipeline 23 and facilitating control and management of the bio-drying device.

[0045] In the example of the present application, the number of drying chambers 1 is three or more, thereby enhancing the coordinated effect of multiple drying chambers 1 and helping to improve the overall heat utilization rate of the biological drying device.

[0046] A biological drying method according to another embodiment of the present invention includes using the biological drying apparatus according to the present invention. The biological drying method includes the following steps:

[0047] Adding drying materials into multiple drying bins 1 to perform biological drying;

[0048] When the exhaust temperature in any drying bin 1 is higher than the set threshold, the gas in the drying bin 1 is introduced into the hot exhaust pipe 22 through the multi-way valve 31, and then flows back to each drying bin 1 through the exhaust gas circulation pipeline 23;

[0049] When the exhaust temperature in any drying chamber 1 is lower than the set threshold, the gas in the drying chamber 1 is introduced into the cold exhaust pipe 21 through the multi-way valve 31, so that the gas with a temperature lower than the set threshold does not participate in the exhaust gas circulation of the biological dry process device.

[0050] According to the biological drying method of the embodiment of the present utility model, since the multi-way valve 31 is used to control the conduction and shutoff of the drying chamber 1 and any one of the cold exhaust pipe 21 and the hot exhaust pipe 22, when the temperature in any drying chamber 1 is higher than the set threshold, the gas of the corresponding drying chamber 1 can be introduced into the hot exhaust pipe 22 through the multi-way valve 31, and then refluxed into each drying chamber 1 through the exhaust gas circulation pipeline 23. When the exhaust temperature in the drying chamber 1 is lower than the set threshold, the gas of the drying chamber 1 is introduced into the cold exhaust pipe 21 through the multi-way valve 31, so that the gas with a temperature lower than the set threshold does not participate in the exhaust gas circulation of the biological drying device, thereby avoiding the mixing of low-temperature exhaust gas and high-temperature exhaust gas, making full use of the waste heat in the high-temperature exhaust gas, improving the heat utilization efficiency of the biological drying device, and having higher economic benefits.

[0051] Optionally, the number of drying bins 1 is n, and the drying cycle of the dried material is m days. After the drying operation begins in the first drying bin 1, the drying operation is performed in the next drying bin 1 every m / n days, so as to stagger the drying cycles of the materials in each drying bin 1. It is understood that after the drying operation of the material in the first drying bin 1 is completed, new dried material is loaded and the drying operation continues, thereby achieving semi-continuous operation of the entire device and staggering the operating cycles of the drying bins 1.

[0052] Since the material drying cycles of each drying bin 1 are staggered, there are situations where some drying bins 1 are in a high-temperature period, while other drying bins 1 are in the early and late stages of drying. The exhaust gas discharged from the drying bin 1 in the high-temperature period has a higher temperature and a higher waste heat recovery value, while the exhaust gas discharged from the drying bin 1 in the early and late stages of drying has a lower temperature and a lower waste heat recovery value. If the low-temperature exhaust gas is mixed with the high-temperature exhaust gas, the temperature of the high-temperature exhaust gas will decrease, reducing the amount of heat that can be recovered and utilized by the device. Therefore, in order to ensure that the device obtains a higher waste heat recovery efficiency, the multi-way valve 31 is switched so that the low-temperature exhaust gas is directly passed into the odor treatment device 53 through the cold exhaust period pipeline, so that it does not participate in the waste heat recovery process.

[0053] A specific embodiment of the biological drying device of the present invention is described below.

[0054] The device of the present invention is used to perform biological drying of domestic waste with an initial moisture content of 60%. There are four drying bins 1, each with a capacity of 5 tons of domestic waste, and a drying cycle of 8 days. The ventilation flow rate into each drying bin 1 is controlled by a program written in the PLC. The control logic of the ventilation flow rate is: on the first and second days of drying, the ventilation flow rate is 0.3m 3 / (t*min), drying day 3-8, ventilation flow rate is 1m 3 / (t*min). At the same time, the air flow rate entering the device is maintained at 50% of the total ventilation volume of each drying bin 1. The first drying bin 1 is loaded with domestic waste, and the fan 57, flow distributor, and PLC are turned on to begin the drying operation. The drying operation for the next drying bin 1 is then carried out every two days. On the eighth day, the first drying bin 1 completes the material drying operation, removes the dried product, and reloads domestic waste to continue the drying operation. At this point, the device enters the semi-continuous biological drying process. The exhaust gas temperature from the drying bin 1 in the early stages of drying is 30-60°C, the exhaust gas temperature from the drying bin 1 in the high-temperature stage is 60-70°C, and the exhaust gas temperature from the drying bin 1 in the late drying stage is 40-60°C. The average air temperature entering the device is 20°C, the exhaust gas temperature in the hot exhaust pipe 22 is stabilized at 50-55°C, the exhaust gas temperature from the exhaust heat exchanger 4 is approximately 40°C, and the air temperature after heat exchange is 35°C. The heated air and recycled exhaust gas mix at a temperature of approximately 45°C. When the exhaust temperature in drying chamber 1 falls below 40°C at the beginning and end of drying, multi-way valve 31 directs the exhaust gas into the cold exhaust pipe 21, eliminating the exhaust gas from participating in the waste heat recovery process. After eight days of drying, the moisture content of the domestic waste decreases from 60% to 35%, achieving a reduction rate of 55.6%, and the low-level calorific value increases from 6.4 MJ / kg to 11.5 MJ / kg.

[0055] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0057] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0059] In the present invention, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0060] Although the above embodiments have been shown and described, it is understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments made by ordinary technicians in this field are all within the scope of protection of the present invention.

Claims

1. A biological drying device, characterized in that: include: A drying bin group, comprising a plurality of drying bins arranged in parallel; A cold exhaust pipe, a hot exhaust pipe and a multi-way valve, each of the drying chambers is connected to the cold exhaust pipe and the hot exhaust pipe via the multi-way valve, and the multi-way valve is used to control the conduction and shutoff between the drying chamber and any one of the cold exhaust pipe and the hot exhaust pipe; An exhaust gas circulation pipeline, one end of which is connected to the hot exhaust pipe, and the other end of which is connected to the plurality of drying bins.

2. The biological drying device according to claim 1, characterized in that The biological drying device also includes an exhaust gas heat exchanger and an odor treatment device. The exhaust gas heat exchanger has a first heat exchange circuit and a second heat exchange circuit that can exchange heat with each other. One end of the first heat exchange circuit is connected to the hot exhaust pipe, and the other end of the first heat exchange circuit and the cold exhaust pipe are both connected to the odor treatment device. One end of the second heat exchange circuit is used to introduce air, and the other end of the second heat exchange circuit is connected to the exhaust gas circulation pipeline.

3. The biological drying device according to claim 2, characterized in that: One end of the hot exhaust pipe is connected to the multi-way valve of each drying bin, and the other end of the hot exhaust pipe is connected to the exhaust gas heat exchanger; one end of the cold exhaust pipe is connected to the multi-way valve of each drying bin, and the other end of the cold exhaust pipe is connected to the odor treatment device.

4. The biological drying device according to claim 2, characterized in that: The biological drying device also includes a first valve and a second valve. The first valve is installed on the exhaust gas circulation pipeline, and the second valve is installed on the pipeline between the second heat exchange loop and the exhaust gas circulation pipeline. The first valve is used to control the flow rate of the circulating exhaust gas, and the second valve is used to control the flow rate of the air.

5. The biological drying device according to claim 2, characterized in that: The biological drying device also includes several first temperature sensors and one second temperature sensor. The first temperature sensor is arranged on the pipeline between each drying bin and the multi-way valve, and the second temperature sensor is arranged on the pipeline between the first heat exchange circuit and the odor treatment device. When the detection temperature of the first temperature sensor is lower than the detection temperature of the second temperature sensor, the multi-way valve controls the drying bin to be connected to the cold exhaust pipe. When the detection temperature of the first temperature sensor is higher than the detection temperature of the second temperature sensor, the multi-way valve controls the drying bin to be connected to the hot exhaust pipe.

6. The biological drying device according to claim 2, characterized in that: The biological drying device also includes a controller and an air flow distributor. The exhaust gas circulation pipeline is connected to the multiple drying bins through the air flow distributor. The controller is electrically connected to the air flow distributor and the multi-way valve. The controller is used to control the ventilation flow of each drying bin and the exhaust switching of the multi-way valve.

7. The biological drying device according to any one of claims 1 to 6, characterized in that: The biological drying device further includes a demister, which is connected in series to the tail gas circulation pipeline and is used to remove condensed water in the tail gas circulation pipeline.

8. The biological drying device according to any one of claims 1 to 6, characterized in that: The biological drying device further includes a fan and a flow meter. The fan is connected in series to the tail gas circulation pipeline, and the flow meter is arranged at the air inlet end of the biological drying device.

9. The biological drying device according to any one of claims 1 to 6, characterized in that: The number of the drying bins is three or more.

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