CN117781668A - Method for determining biomass drying characteristics, biomass drying method and device - Google Patents

Abstract

The invention relates to the technical field of biomass drying, and discloses a method for determining biomass drying characteristics, a biomass drying method and a biomass drying device. And establishing a process parameter library according to the drying characteristic data, and selecting required drying conditions from the process parameter library to dry the biomass. The biomass drying device comprises a drying furnace body, a material container and a weighing mechanism, wherein biomass to be dried is accommodated in the material container and is arranged in the drying cavity for drying; the weighing mechanism is used for monitoring the weight of the biomass in real time in the drying process so as to form weight change data, and is used for exploring the drying characteristics of the biomass, thereby being beneficial to improving the drying quality, optimizing the drying process and optimizing the energy efficiency.

Description

Method for determining biomass drying characteristics, biomass drying method and device

Technical Field

The invention relates to the technical field of biomass drying, in particular to a method for determining biomass drying characteristics, a biomass drying method and a biomass drying device.

Background

Original ecological biomass (such as medicinal materials, vegetables, biomass fuel and the like) is often unfavorable for transportation and storage due to large size, high water content and the like, so that the biomass needs to be dried to a certain degree. In the related art, the drying process of biomass is mainly applied to the optimization of the device structure to solve the problems of drying uniformity, drying efficiency, operation convenience and the like, but the final drying degree of materials under different types, different states and different drying conditions is dependent on the experience of operators, so that the situations of insufficient drying or overdrying of the materials can be caused, the optimal moisture requirement required by the materials is difficult to reach, and the energy waste is caused.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a method for determining the drying characteristics of biomass and a biomass drying method for drying according to the drying characteristics of biomass, so as to solve the problem that the drying degree is not easy to control, thereby being convenient for controlling the moisture of materials and improving the drying quality.

The invention also provides a biomass drying device applied to the method for determining the biomass drying characteristics.

According to an embodiment of the first aspect of the present invention, a method for determining biomass torrefaction characteristics includes:

Before drying, recording the material state and initial weight of biomass to be dried, wherein the material state comprises the type of biomass;

drying the biomass until the weight of the biomass is reduced to a target weight, and recording drying conditions, wherein the drying conditions comprise drying time and drying temperature;

acquiring the weight of the biomass in real time in the drying process, and forming weight change data of the weight of the biomass from the initial weight to the target weight;

the weight change data is used for forming drying characteristic data with the material state and the drying condition.

The biomass drying method provided by the embodiment of the invention has at least the following beneficial effects: when the biomass drying device is applied, the weight change data in the biomass drying process can be obtained while the drying of the biomass is realized, the biomass weight can be monitored in real time, so that the biomass can be accurately dried to reach the target weight, in addition, the data can also form drying characteristic data together with the material state and the recorded drying conditions, and the drying characteristic data are used for representing the drying conditions corresponding to the biomass to be dried, which is set in the material state and the initial weight, and are favorable for improving the drying quality, optimizing the drying process and optimizing the energy efficiency.

In the method for determining the biomass drying characteristics according to some embodiments of the present invention, a drying cavity is provided, the biomass is placed in the drying cavity, hot air is introduced into the drying cavity to dry the biomass, and drying waste gas is discharged from the drying cavity; and in the drying process, taking the temperature of the hot air introduced into the drying cavity as the drying temperature.

In the method for determining biomass drying characteristics according to some embodiments of the present invention, the drying conditions further include an air volume of hot air introduced into the drying chamber.

In the method for determining the biomass drying characteristics according to some embodiments of the present invention, in the drying process, the air volume of the hot air is changed to form air volume change data; the air quantity change data are used for forming drying characteristic data with the material state, the weight change data and the drying time.

In the method for determining the biomass drying characteristics according to some embodiments of the present invention, in the drying process, the humidity of the exhaust gas discharged from the drying chamber is obtained in real time, so as to form humidity variation data; the humidity change data are used for forming drying characteristic data of the biomass together with the material state of the biomass, the weight change data and the drying conditions.

In the method for determining the biomass drying characteristics according to some embodiments of the present invention, in the drying process, the drying temperature is changed to form temperature change data; the temperature change data are used for forming drying characteristic data with the material state of the biomass, the weight change data and the drying time.

In the method for determining the biomass drying characteristics according to some embodiments of the present invention, the material state further includes a dryness degree of the material and/or a breakage degree of the material, the dryness degree of the material includes a dry material and a wet material, and the breakage degree of the material includes a large-volume material, a small-volume material and a large-and-small-mixed-volume material.

According to a second aspect of the embodiment of the invention, a biomass drying method comprises the following steps: determining the drying characteristic data according to the method for determining biomass drying characteristic data according to the embodiment of the first aspect, determining the drying conditions required for drying the set material state and the initial weight of biomass to the target weight according to the drying characteristic data, and establishing a process parameter library; before drying, selecting a required drying condition from the process parameter library according to the material state and the initial weight of the biomass to be dried; drying the biomass under the selected drying conditions.

The biomass drying method provided by the embodiment of the invention has at least the following beneficial effects: the drying characteristic data can represent drying conditions required for drying the biomass to be dried with the set material state and initial weight, so that a process parameter library is established according to the drying characteristics, corresponding drying conditions can be determined according to the process parameter library during drying, manual experience judgment is not needed, the material moisture is conveniently controlled, the drying quality is improved, and the probability of insufficient drying or overdrying is reduced.

According to a third aspect of the present invention, a biomass torrefaction device is applied to the method for determining torrefaction characteristics of biomass according to the first aspect of the present invention, the biomass torrefaction device including a torrefaction furnace body, a material container, and a weighing mechanism, wherein,

a drying cavity is formed in the drying furnace body, the drying furnace body is provided with an air inlet and an air outlet, and the air inlet and the air outlet are respectively communicated with the drying cavity;

the material container is arranged in the drying cavity and is used for accommodating biomass to be dried;

the weighing mechanism is supported below the material container;

the hot air is introduced into the drying cavity from the air inlet to heat and dry the biomass, and the weighing mechanism is used for monitoring the weight of the biomass in real time in the drying process so as to form weight change data.

The biomass drying device provided by the embodiment of the invention has at least the following beneficial effects: when the biomass drying device is used, biomass to be dried can be accommodated in the material container and placed in the drying cavity for drying, and the weight of the biomass can be monitored in real time by the weighing mechanism in the drying process, so that weight change data of the biomass can be obtained, and a data basis can be provided for exploring the drying characteristic of the biomass.

In the biomass drying device according to some embodiments of the present invention, the drying oven body includes a bottom wall and a side wall, the bottom wall and the side wall surround to form the drying cavity, and a limiting hole communicated with the drying cavity is formed in the bottom wall;

the weighing mechanism comprises an electronic scale and a support, the electronic scale is arranged outside the drying cavity and located below the bottom wall, the support penetrates through the limiting hole, one end of the support is located in the drying cavity, the other end of the support is located outside the drying cavity, and the support is used for supporting the bottom of the material container and between the electronic scale.

In the biomass drying device according to some embodiments of the present invention, a limiting portion is disposed at the bottom of the material container, the support is abutted to the limiting portion, and the limiting portion is used for limiting a relative position between the support and the bottom of the material container.

The biomass drying device comprises a biomass drying device body, a plurality of air distribution pieces and a drying device, wherein the air distribution pieces are distributed with a plurality of air holes; the air distribution piece is positioned in the drying cavity and connected with the drying furnace body, and the air distribution piece is shielded between the material container and the air inlet, so that hot air entering the drying cavity passes through the air distribution piece and then passes through the material container.

In the biomass drying device according to some embodiments of the present invention, the number of the air distribution members is at least two, a drying area is formed between the weighing mechanism and the air distribution members adjacent to the weighing mechanism at intervals, and a steady flow area is formed between the adjacent air distribution members at intervals, so that hot air entering the drying cavity passes through the steady flow area before entering the drying area.

The biomass drying device of some embodiments of the present invention further comprises a wind shielding member, wherein the wind shielding member is connected to the drying oven body and is shielded from the air inlet, and the wind shielding member is provided with a plurality of through holes.

The biomass drying device of some embodiments of the invention further comprises an air inlet pipe which is connected with the drying furnace body at the air inlet, the air inlet pipe is used for introducing hot air into the drying cavity from the air inlet; wherein,

A temperature monitor and/or a humidity detector are arranged in the air inlet pipe;

or, the air inlet pipe is provided with a first monitoring hole, and the first monitoring hole is suitable for a temperature monitor and/or a humidity detector to pass through.

The biomass drying device of some embodiments of the present invention further comprises an air outlet pipe, wherein the air outlet pipe is connected to the drying furnace body at the air outlet, and the air outlet pipe is used for discharging drying waste gas from the air outlet to the outside of the drying cavity; wherein,

a temperature monitor and/or a humidity detector are arranged in the air outlet pipe;

or, the air outlet pipe is provided with a second monitoring hole, and the second monitoring hole is suitable for a temperature monitor and/or a humidity detector to pass through.

In the biomass drying device according to some embodiments of the present invention, the drying oven body includes a top wall, a bottom wall and a side wall, the top wall, the bottom and the side wall surround to form the drying cavity, the air inlet is disposed on the top wall, an exhaust area is formed between the material container and the bottom wall at intervals, and the air outlet is disposed on the side wall at a position corresponding to the exhaust area, or the air outlet is disposed on the bottom wall.

Additional aspects and advantages of the 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.

Drawings

Fig. 1 is a schematic diagram of an internal structure of a biomass drying apparatus according to an embodiment of the invention;

FIG. 2 is an enlarged schematic view of a portion of FIG. 1;

FIG. 3 is a front view of a biomass torrefaction device according to an embodiment of the present disclosure;

FIG. 4 is a side view of FIG. 3;

fig. 5 is a schematic structural view of an air distribution plate in a biomass drying device according to an embodiment of the invention.

Reference numerals:

a drying oven body 100; a drying chamber 101; a bottom wall 102; a sidewall 103; a top wall 104; an air inlet 105; an air outlet 106; an inner wall 107 of the oven body; a limiting hole 108; a drying zone 109; a steady flow region 110; a sample taking and placing door 111; a handle 112; a viewing window 113;

a material container 200; a bottom plate 201; a side plate 202;

a weighing mechanism 300; an electronic scale 301; a bracket 302; a support portion 303; a first abutting portion 304; a second abutment 305;

an air distribution member 400; a vent 401;

a wind shielding member 500;

an air inlet pipe 600; a first monitoring aperture 601;

an air outlet pipe 700; a second monitoring aperture 701.

Detailed Description

The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.

In the description of the embodiments of the present invention, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description and simplification of the description, and it is not indicated or implied that the apparatus or device referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, if a feature is referred to as being "disposed", "fixed", "connected" or "mounted" on another feature, it can be directly disposed, fixed or connected to the other feature or be indirectly disposed, fixed or connected or mounted on the other feature. In the description of the embodiments of the present invention, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

For the original ecological biomass, the material states such as the types, the sizes, the moisture and the like or the initial weights of the original ecological biomass are different, and the drying conditions (such as the drying time, the drying temperature and the like) required for drying to the required state are also different, so that the uniformity of drying and the convenience of operation are optimized only from the structure of the device, and the further realization of the drying effect and the maximization of benefits are difficult. The embodiment of the invention provides a method for determining biomass drying characteristics, which forms drying characteristic data through weight change data, material states and drying conditions to solve the problem that the drying degree is not easy to control. The biomass drying device can monitor the weight change of the material in real time while realizing the drying of the material so as to represent the moisture change of the biomass, so that the biomass drying degree can be conveniently and accurately mastered on one hand, and on the other hand, the biomass drying device can be applied to a method for determining the biomass drying characteristics, and the weight of the biomass is monitored in real time in the drying process, so that the weight change data in the biomass drying process is obtained, the drying characteristics of the biomass can be conveniently explored, and a theoretical basis is provided for the quality improvement treatment mode and the optimization process parameters of the biomass. Embodiments of the invention are described below with reference to the accompanying drawings:

The embodiment of the invention provides a method for determining biomass drying characteristics, which comprises the following steps:

before drying, recording the material state and initial weight of the biomass to be dried, wherein the material state comprises the type of the biomass; drying the biomass until the weight of the biomass is reduced to a target weight, and recording drying conditions, wherein the drying conditions comprise drying time and drying temperature;

in the drying process, the weight of the biomass is obtained in real time, and weight change data from the initial weight to the target weight of the biomass is formed, wherein the weight change data are used for forming drying characteristic data with the material state and the drying condition.

It will be appreciated that the purpose of biomass torrefaction is to reduce the moisture content, and that loss of moisture results in a reduction in the weight of the biomass, and therefore, by the weight difference between the biomass before and after torrefaction, it can be determined whether the biomass has been torrefied to the desired moisture content. That is, before biomass is dried, the weight of the biomass is acquired and recorded as an initial weight, and the weight to be achieved by drying the biomass is determined as a target weight according to the initial weight and the required drying degree, and thus, the drying process can determine whether the required drying effect is achieved by whether the weight of the biomass reaches the target weight.

By applying the method for determining the biomass drying characteristics, disclosed by the embodiment of the invention, the biomass weight can be monitored in real time while the drying of the biomass is realized, the initial weight of the biomass at the beginning of the drying can be obtained, and whether the drying reaches the target weight or not is identified in the drying process, so that the biomass can be accurately dried to reach the target weight, and insufficient drying or overdrying can be avoided. And the weight change data of the biomass in the drying process can be obtained by monitoring the weight of the biomass in real time, the data can be used for forming drying characteristic data together with the material state and the drying condition, the drying characteristic data is used for representing the drying condition corresponding to the biomass to be dried with the set material state and the initial weight, for example, the weight change characteristic along with the drying time at the set drying temperature, so that the required drying time for drying certain types of biomass with a certain weight to the target water content at the set drying temperature can be obtained. Or, the drying temperature can be changed within a set range, the drying temperature change data can be obtained, and the drying characteristic data can be formed together with the weight change data and the drying time, so that the required drying temperature and drying time for drying a certain type of biomass with a certain weight to the target water content can be known, and the energy utilization rate can be improved, and therefore, the drying characteristic data can provide a theoretical basis for optimizing the drying process and optimizing the energy efficiency.

The weight of the biomass can be obtained in real time through the electronic scale to form weight change data, the weight change data is understood as weight change data with time, and the weight change data can be recorded/stored in a form of a table or a curve. As an example, the weight change data may be obtained by manually and periodically reading the weight and the current drying time and recording, and making weight-time table data or by drawing a weight-time characteristic curve, or the electronic scale may transmit the real-time weight change to a computer software program end through a data transmission interface, and the real-time weight may form the weight-time table data through software, or draw a real-time weight-time characteristic curve through software.

In some embodiments of the method of determining biomass torrefaction characteristics, a torrefaction chamber is provided, biomass is placed in the torrefaction chamber, hot air is introduced into the torrefaction chamber to torrefy the biomass, and torrefaction waste gas is discharged from the torrefaction chamber. In the drying process, the temperature of the hot air flowing into the drying cavity is used as the drying temperature, for example, the air temperature can be measured in a pipeline for feeding air into the drying cavity, the air temperature obtained by measurement can be prevented from being influenced by biomass in the drying cavity, and therefore the accuracy of data of the required drying temperature is improved. In the method for determining the drying characteristics of the biomass according to some embodiments, the drying condition of the biomass may further include an air quantity of hot air introduced into the drying cavity, so that a certain type of biomass with a certain weight can be known to be dried to the target water content, and a required drying temperature, air quantity and drying duration are beneficial to improving the utilization rate of energy and provide a theoretical basis for optimizing the drying process and optimizing the energy efficiency.

In some embodiments, the drying temperature is varied during the drying process to form temperature variation data; the temperature change data are used for forming drying characteristic data with the material state, weight change data and drying time of the biomass, so that the drying characteristic data of the weight and drying temperature of the biomass along with the change of the drying time are researched.

In the method for determining the biomass drying characteristics according to some embodiments of the present invention, the air volume of the hot air may be changed during the drying process to form air volume change data; the air quantity change data are used for forming drying characteristic data together with the material state, the weight change data and the drying time. And thus, the drying characteristic data of the change of the drying air quantity, the biomass weight and the drying temperature along with the drying time are researched, and theoretical calculation basis is provided for optimizing the drying efficiency and optimizing the energy consumption.

Wherein, the hot air source can be formed by a hot air blower, and the hot air blower can be provided with a frequency converter to adjust the air quantity and the air temperature; or the source of the hot air can be formed by introducing industrial waste gas (such as high-temperature waste gas formed by kiln production) by an industrial fan, thereby realizing the reutilization of production waste heat, being beneficial to energy conservation, the temperature of the industrial waste gas generally changes within a given range, and the air quantity can be adjusted by the industrial fan.

Different sources of hot air can also affect drying conditions and drying effectiveness. Therefore, the drying characteristic data of the change of the drying air quantity, the biomass weight and the drying temperature along with the drying time are researched, and the method has practical reference significance. For example, when the air heater is used as a drying heat source, an effective theoretical calculation basis can be provided for researching how to adjust the air temperature and the air quantity and how to configure the initial quality of the biomass to achieve the best effects of high drying efficiency and low energy consumption, and when the industrial waste gas is used as the drying heat source, an effective theoretical calculation basis can be provided for how to effectively utilize the industrial waste gas to dry the biomass.

In some embodiments of the method of determining biomass torrefaction characteristics, the humidity of the exhaust gas discharged from the torrefaction chamber is acquired in real time during torrefaction to form humidity variation data; the humidity monitoring data can provide theoretical calculation basis for industrially establishing a biomass quality improvement drying production line to calculate the evaporation capacity of the biomass quality improvement drying production line. Therefore, the humidity change data can be used for forming drying characteristic data of the biomass together with the material state, the weight change data and the drying conditions of the biomass, so that the change characteristics of the biomass weight, the humidity of waste gas and the drying temperature along with the drying time are researched, and theoretical calculation basis is provided for optimizing the drying efficiency, optimizing the energy consumption and calculating the evaporation capacity of the drying production line.

It will be appreciated that the biomass material may be subjected to some pre-treatment prior to entering the torrefaction chamber to facilitate rapid torrefaction, such as preliminary drying, to reduce the moisture adhering to the surface of the material, or crushing, to reduce the volume of the material. Thus, in some embodiments of the method of determining a torrefaction characteristic of biomass, when the state of the biomass material is recorded, the state of the material also includes a degree of dryness of the material and/or a degree of breakage of the material, the degree of dryness of the material including dry material and wet material, the degree of breakage of the material including large volume material, small volume material, and large and small mixed volume material. The biomass in the drying cavity is in different material states, and the weight change in the drying process and the required drying conditions are also affected. Therefore, the above-mentioned material state of the biomass is recorded, so that it is convenient to study the relationship between the material state of the biomass and the drying condition required for drying, for example, how the same kind of biomass is configured with other material states (such as the drying degree or the crushing degree) under the given drying condition, or how the drying condition is configured under the determined material state, so as to realize the optimal configuration of the drying efficiency and the energy consumption.

From the above, the method for determining the biomass drying characteristic according to the embodiment of the application can study the biomass drying characteristic, calculate the set material state and the drying condition required by the biomass drying of the initial weight to the target weight, and thus optimize the drying efficiency and the biomass drying heat utilization efficiency.

Some embodiments of the present application also provide a biomass drying method, including: according to the method for determining biomass drying characteristic data in the embodiment of the first aspect, the drying characteristic data is determined, according to the drying characteristic data, drying conditions required for drying the biomass with the set material state and the initial weight to the target weight are determined, a process parameter library is established, the drying characteristic data can represent drying conditions required for drying the biomass to be dried with the set material state and the initial weight, therefore, the process parameter library can comprise the material state, the initial weight and the required drying conditions, the process parameter library can be applied to actual drying processing production, and before drying, the required drying conditions are selected from the process parameter library according to the material state and the initial weight of the biomass to be dried; and the drying is carried out under the selected drying condition, so that the artificial judgment is reduced, the drying deficiency or overdrying probability is reduced, the standardization and automation of a biomass drying process are facilitated, and the comprehensive optimization of quality, efficiency and energy consumption is realized.

In the biomass drying method of some embodiments, in the drying process, the drying conditions can be regulated and controlled in real time according to the obtained weight change data, so that the drying efficiency and the energy consumption can be effectively balanced. As an example, the heat entering the drying box may be raised when the weight change is small, such as raising the temperature of hot air or increasing the amount of air; the heat entering the drying box can be reduced when the temperature change is large, for example, the temperature of hot air is reduced or the air quantity is reduced.

The material state can comprise the type, the dryness and humidity degree, the crushing degree and the like of the material, the drying condition can comprise the drying temperature, the drying time, the drying air quantity and the like, and the more perfect the process parameter library is, the more beneficial to the standardization and automation of the drying process is.

The embodiment of the invention also provides a biomass drying device, which is applied to the method for determining the drying characteristics of biomass in the embodiment of the first aspect of the invention, and the weight of the biomass is monitored in real time in the drying process, so that the weight change data of the biomass can be obtained. Fig. 1 is a schematic view of an internal structure of a biomass dryer according to an embodiment of the invention, fig. 2 is a schematic view of a portion a in fig. 1, fig. 3 is a front view of the biomass dryer according to an embodiment of the invention, fig. 4 is a side view of fig. 3, and fig. 5 is a schematic view of a wind distribution plate in the biomass dryer according to an embodiment of the invention.

Referring to fig. 1 to 5, the biomass drying device according to the embodiment of the invention includes a drying oven body 100, a material container 200 and a weighing mechanism 300, wherein a drying cavity 101 is provided in the drying oven body 100, the material container 200 is provided in the drying cavity 101 for accommodating biomass to be dried, hot air is introduced into the drying cavity 101 from an air inlet 105 to heat the dried biomass, and the weighing mechanism 300 is used for monitoring the weight of the biomass in real time during the drying process to form weight change data, so as to provide a data base for exploring the drying characteristics of the biomass.

The biomass drying device of the embodiment can be applied to the method for determining the drying characteristics of biomass in the above embodiment, and is used for drying biomass and monitoring the weight of the biomass in real time in the drying process. Can provide a data basis for exploring the drying characteristics of the biomass. From the foregoing, it can be seen that studying the drying characteristics of biomass is beneficial to improving the energy utilization rate, and provides a theoretical basis for optimizing the drying process and optimizing the energy efficiency.

Referring to fig. 1 and 2, in the biomass drying apparatus according to some embodiments, a drying chamber 101 is disposed inside a drying furnace body 100, the drying furnace body 100 is provided with an air inlet 105 and an air outlet 106, the air inlet 105 and the air outlet 106 are respectively communicated with the drying chamber 101, the air inlet 105 is used for introducing hot air into the drying chamber 101 to dry biomass, and the air outlet 106 is used for discharging drying waste gas out of the drying chamber 101. The material container 200 is disposed in the drying cavity 101 and is used for accommodating biomass to be dried, and the weighing mechanism 300 is supported below the material container 200, so that the weight change of the material container 200 and the biomass inside the material container can be monitored in real time, and the weight of the material container 200 is unchanged before and after drying, so that the weight change data obtained by the weighing mechanism 300 can be used for representing the weight change of the biomass.

The material container 200 may include a bottom plate 201 and side plates 202, and at least the bottom plate 201 of the material container 200 is provided with ventilation holes to allow hot air to pass therethrough, thereby heat-drying biomass loaded on the material container 200. The side plate 202 may be abutted against the inner wall of the drying oven body 100, so as to effectively block the hot air from flowing between the side plate 202 and the interior of the drying oven body 100, and improve the utilization rate of the hot air. Further, the side plate 202 may be inclined towards the side far away from the bottom plate 201 and away from the center of the material container 200 to form a flared container structure, so that when the material container 200 is placed in the drying chamber 101, the side wall 103 and the inner wall of the drying oven body 100 have an included angle, so that the contact area between the side wall 103 and the inner wall of the drying oven can be reduced, and the material container 200 can conveniently enter and exit the drying chamber 101.

The side plate 202 of the material container 200 can be detachably connected with the inner wall of the drying oven body 100, so that the material container 200 can conveniently enter and exit the drying cavity 101; alternatively, the side plate 202 is provided with an outward flange, the inner wall of the drying oven body 100 is provided with a rib, and the flange is supported on the rib, so that the material container 200 can be conveniently moved out of the drying cavity 101. Further, the flange can be abutted against the inner wall of the drying oven body 100, so that hot air can be effectively prevented from flowing through between the flange and the interior of the drying oven body 100, and the utilization rate of the hot air is improved.

In the biomass drying device of some embodiments, the drying oven body 100 includes a bottom wall 102 and a side wall 103, the bottom wall 102 and the side wall 103 enclose to form a drying cavity 101, and a limiting hole 108 communicated with the drying cavity 101 is arranged on the bottom wall 102. The weighing mechanism 300 comprises an electronic scale 301 and a bracket 302, wherein the electronic scale 301 is arranged outside the drying cavity 101 and below the bottom wall 102, so that high temperature or air flow is prevented from affecting the measurement accuracy of the electronic scale 301. The bracket 302 passes through the limiting hole 108, one end of the bracket 302 is positioned in the drying cavity 101, the other end of the bracket 302 is positioned outside the drying cavity 101, and the bracket 302 is used for being supported between the bottom of the material container 200 and the electronic scale 301, so that the weights of the material container 200, biomass and the bracket 302 can be pressed on the electronic scale 301, and the weight measurement is realized. Similarly, the weight of the rack 302 is not changed during the drying process, and thus the weight change data obtained from the electronic scale 301 can be used to represent the weight change of the biomass.

In the biomass drying device of some embodiments, the bottom of the material container 200 is provided with a limiting portion, the bracket 302 is abutted to the limiting portion, and the limiting portion is used for limiting the relative position of the bracket 302 and the bottom of the material container 200, so as to realize stable support to avoid affecting the accuracy of weight monitoring. For example, the bracket 302 may include a supporting portion 303, a first abutting portion 304 and a second abutting portion 305, where the supporting portion 303 is disposed through the limiting hole 108; the first abutting part 304 is positioned in the drying cavity 101 and connected to the supporting part 303, and the first abutting part 304 is used for abutting against a limiting part at the bottom of the material container 200; the second abutting portion 305 is located outside the drying chamber 101 and connected to the supporting portion 303. One of the limiting portion and the first abutting portion 304 may include a plurality of grooves formed in the bottom of the material container 200, and the other may include a plurality of supporting protrusions or a supporting plate, where the supporting protrusions or the supporting plate are disposed in the grooves to limit positions. When the first abutting portion 304 is a supporting plate, a plurality of through holes for ventilation can be formed in the supporting plate so as to avoid blocking hot air.

Referring to fig. 1 and 5, in some embodiments, the biomass drying apparatus further includes a wind distribution member 400, wherein the wind distribution member 400 is located in the drying chamber 101 and connected to the drying oven body 100, and a plurality of ventilation holes 401 are distributed on the wind distribution member 400 to allow hot wind to pass through. The air distribution member 400 is blocked between the material container 200 and the air inlet 105, so that the hot air entering the drying cavity 101 passes through the air distribution member 400 and then passes through the material container 200. So that the hot air is distributed by the air distribution member 400 before the hot air reaches the weighing mechanism 300, and the hot air reaches the biomass in the material container 200 after passing through the air holes 401. The air distribution member 400 can be uniformly provided with a plurality of ventilation holes 401, so that the uniformity of air distribution is improved.

Referring to fig. 1, in some embodiments, the number of the air distribution members 400 is at least two, the drying areas 109 are formed between the weighing mechanism 300 and the air distribution members 400 adjacent to the weighing mechanism 300, and the steady flow areas 110 are formed between the adjacent air distribution members 400, so that hot air entering the drying cavity 101 passes through the steady flow areas 110 before entering the drying areas 109, the hot air flows in the steady flow areas 110 after passing through the air distribution members 400, the uniformity of the distribution of the hot air can be improved, the uniformly distributed hot air entering the drying areas 109 can be uniformly contacted with biomass, and therefore, the uniformity of drying is improved, and the probability of partial overdrying and partial insufficient drying is effectively reduced.

Referring to fig. 1, in some embodiments, the biomass drying apparatus further includes a wind shielding member 500, the wind shielding member 500 is connected to the drying oven body 100 and shielded from the air inlet 105, the wind shielding member 500 is provided with a plurality of through holes, and the wind shielding member 500 is used for shielding wind at the air inlet 105 to reduce the speed of the incoming hot air. So as not to impact the biomass and material container 200 at too fast a wind speed, thereby affecting the accuracy of the weighing mechanism 300 in monitoring weight.

Referring to fig. 1, in some embodiments, the biomass drying device includes the wind shielding member 500 and the wind distribution member 400, so that after the hot wind enters the air inlet 105, the hot wind first passes through the speed reduction of the wind shielding member 500, then passes through the wind distribution member 400 and the wind distribution and uniform wind distribution of the steady flow area 110, and then reaches the drying area 109 to dry the biomass, thereby effectively improving the uniformity of hot wind drying and reducing the influence of the impact of the wind flow on the weighing mechanism 300.

Referring to fig. 1 to 4, in some embodiments, the biomass drying apparatus further includes an air inlet duct 600, the air inlet duct 600 being connected to the drying oven body 100 at the air inlet 105, the air inlet duct 600 being for introducing hot air from the air inlet 105 into the drying chamber 101; wherein, a temperature monitor and/or a humidity detector are arranged in the air inlet pipe 600; alternatively, the air inlet pipe 600 is provided with a first monitoring hole 601, and the first monitoring hole 601 is suitable for passing through a temperature monitor and/or a humidity detector. The temperature monitor is used to monitor the temperature of the hot air entering the drying chamber 101, and can be used to form drying temperature data. The humidity detector is used for monitoring the humidity of the hot air entering the drying cavity 101 from the air inlet 105 and comparing the humidity of the drying waste gas discharged from the drying cavity 101 after drying.

Referring to fig. 1 to 4, in some embodiments, the biomass drying apparatus further includes an air outlet pipe 700, the air outlet pipe 700 being connected to the drying oven body 100 at the air outlet 106, the air outlet pipe 700 being used for discharging the drying exhaust gas from the air outlet 106 to the outside of the drying chamber 101; wherein, a temperature monitor and/or a humidity detector are arranged in the air outlet pipe 700; alternatively, the air outlet pipe 700 is provided with a second monitoring hole 701, and the second monitoring hole 701 is suitable for passing through a temperature monitor and/or a humidity detector. The temperature monitor is used for monitoring the temperature of the drying exhaust gas discharged from the drying chamber 101, and the humidity detector is used for monitoring the humidity of the drying exhaust gas discharged from the air outlet 106 through the air outlet pipe 700.

In the above embodiment, the temperature monitor may transmit the real-time humidity change to the computer program end through the data transmission interface, obtain the data of the temperature change with time, and may draw a real-time temperature-time curve through software. Similarly, the humidity monitor can transmit the real-time humidity change to the computer program end through the data transmission interface to acquire the data of the humidity change along with time, and can draw a real-time humidity-time curve through software. The temperature monitor and the humidity detector may be the same monitor with temperature and humidity monitoring functions, or may be two separate monitors.

The weight change curve, the temperature change curve and the humidity change curve can be synchronously displayed in the same coordinate system interface, so that the weight change and the temperature and humidity change of a material with certain mass in the drying process can be realized at a set temperature and air quantity, and the drying characteristic curve is obtained. Through knowing the stoving characteristic of different kinds, material state living beings, can learn to dry the great primitive state living beings of water content of certain quality to the target water content, required hot-blast amount of wind, hot-blast temperature, stoving time. When the industrial waste heat is utilized for drying, the temperature of the industrial waste gas is known, and the air quantity and the drying time of the waste gas to be provided can be obtained through a drying characteristic curve. Therefore, the biomass drying heat utilization efficiency can be optimized, and a theoretical basis is provided for the design of process parameters in industrial application, so that the optimization of the process parameters is guided. And the humidity monitoring data provide theoretical calculation basis for industrially establishing the biomass quality improvement drying production line to calculate the evaporation capacity of the biomass quality improvement drying production line.

Referring to fig. 1 to 4, in the biomass drying apparatus according to some embodiments of the present invention, a drying oven body 100 includes a top wall 104, a bottom wall 102 and a side wall 103, a drying cavity 101 is formed by surrounding the top wall 104, the bottom and the side wall 103, an air inlet 105 is formed in the top wall 104, an air exhaust area is formed between a material container 200 and the bottom wall 102 at an interval, and an air outlet 106 is formed in a position corresponding to the air exhaust area on the side wall 103, or the air outlet 106 is formed in the bottom wall 102. Therefore, hot air can enter from the upper part and can be discharged from the lower part, and the flying condition of fine materials can be reduced. Of course, in some embodiments, a scheme of air intake from below and air exhaust from above may be adopted, and positions of the corresponding air inlets 105 and air outlets 106 are exchanged, so that the positions of the wind shielding member 500 and the wind distributing member 400 are adaptively adjusted.

As an example, referring to fig. 1 to 5, an embodiment of the present invention provides a biomass drying device capable of weighing in real time as follows:

the biomass drying device can comprise a heat source, a drying oven body 100, a wind guard, a wind distribution plate, a material container 200 and a weighing mechanism 300, wherein the drying oven body 100 is provided with an air inlet and outlet 106, a steady flow area 110, a drying area 109, a sampling door 111 and the like.

The heat source may be a hot air blower or industrial hot air, and preferably, the hot air blower is provided with a frequency converter to adjust air quantity and air temperature, and is connected with the air inlet 105.

The air inlet 105 is connected with the air inlet pipe 600, the air outlet 106 is connected with the air outlet pipe 700, the air inlet pipe 600 is provided with a first monitoring hole 601 and is provided with a hygrothermograph to monitor the temperature and humidity change of the air inlet, and/or the air outlet pipe 700 is provided with a second monitoring hole 701 and is provided with a hygrothermograph to monitor the temperature and humidity change of the air outlet. The hygrothermograph can select different measuring ranges and precision according to the requirements.

The wind guard is connected to the lower end of the air inlet pipe 600 or to the top wall 104 of the drying oven and covers the air inlet 105, the wind guard can be round, square or other polygonal shape, and a round vent 401 between 1 mm and 10mm is arranged to disturb the air inlet flow field; after entering from the air inlet 105, the air flow is dispersed mainly to the periphery through the wind shield, and part of the air flow flows downwards through the vent holes 401 of the wind shield.

The biomass drying device comprises two layers of air distribution pieces 400, a steady flow area 110 is formed between the two layers of air distribution pieces 400, the air distribution pieces 400 are square plates, and the size of each air distribution piece is the same as the size of the hollow space of the drying furnace body 100 so as to be abutted against the inner wall of the drying furnace body 100, and air leakage is reduced; the air distribution member 400 may be made of high temperature resistant materials such as stainless steel 06Cr19Ni10, ceramic plate, aluminum plate, etc.; round holes of 1-10 mm are uniformly distributed on the air distribution piece 400, and angle steel is welded on the inner wall of the drying furnace body 100 for bearing.

The upper air distribution plate can be taken out through the sampling and laying-out door 111 to replace air distribution plates with different apertures according to requirements so as to meet the drying requirements.

The material container 200 is of a side inverted trapezoid structure, the peripheral side plates 202 are solid plates, the bottom plate 201 is provided with round vent holes of 1-10 mm, the upper ends of the side plates 202 are abutted against the inner wall of the furnace body to prevent air leakage, the bottom plate 201 is connected with/abutted against the weighing mechanism 300, the bottom plate 201 is provided with a limiting part, and the upper sections of the side plates 202 are provided with 2 holes 203, so that the material container is convenient to take out.

The weighing mechanism 300 comprises a bracket 302 and an electronic scale 301, wherein the bracket 302 comprises three supporting rods, the upper and lower connecting planes of the three supporting rods are respectively connected/abutted with the sample tray and the electronic scale 301, the bottom wall 102 of the drying furnace body 100 is provided with a supporting rod limiting hole 108, one end of each supporting rod penetrating through the limiting hole 108 is positioned in the drying cavity 101, and the other end of each supporting rod is positioned outside the drying cavity 101 and connected/abutted with the electronic scale 301; the electronic scale 301 is provided with a data transmission interface, can select different measuring ranges and precision according to different sample amounts, and can continuously display weight change. Preferably, the support rods are steel pipes, so that the support 302 is formed by fixing three steel pipes on a base, the base is placed on the electronic scale 301, and the upper ends of the steel pipes are connected with/abutted against the sample material container 200, so that weighing is realized.

The side wall 103 of the drying oven body 100 is provided with a sample taking and placing door 111 which is composed of a side-by-side door, a handle 112 and an observation window 113. The handle 112 is a high-temperature-resistant anti-scalding door handle 112; the observation window 113 is a toughened and high-temperature-resistant double-layer glass door so as to realize real-time observation of the surface state of the dried material; preferably, the sampling door 111 is provided with a glass-made observable window in the middle, and the main body is a ceramic fiber plate. The sample door 111 may be provided with a silicone door seal, an aluminum partition, etc. to improve the sealing of the sample door 111. The upper end of the drying furnace body 100 is provided with an air inlet 105, the air inlet 105 is connected with an industrial air heater, preferably the industrial air heater is provided with a frequency converter for adjusting air quantity and air temperature, and a heat source is provided. Circular holes are arranged on the air inlet pipe 600 and the air outlet pipe 700 and are used for inserting hygrothermograph. Preferably, the hygrothermograph is provided with a data transmission interface and is used for testing the temperature and humidity change condition of the airflow before and after drying.

The biomass drying device of this example can be in the weight change of stoving in-process real-time supervision material to accurate control is toasted material moisture, prevents that the phenomenon of stoving inadequacy or excessive stoving from taking place, also can explore the stoving characteristic of different biomass, provides theoretical basis for handling mode, the technology of industrial living beings.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (10)

1. A method of determining biomass torrefaction characteristics comprising:

before drying, recording the material state and initial weight of biomass to be dried, wherein the material state comprises the type of biomass;

drying the biomass until the weight of the biomass is reduced to a target weight, and recording drying conditions, wherein the drying conditions comprise drying time and drying temperature;

acquiring the weight of the biomass in real time in the drying process, and forming weight change data of the weight of the biomass from the initial weight to the target weight;

the weight change data is used for forming drying characteristic data with the material state and the drying condition.

2. The method of determining biomass torrefaction characteristics according to claim 1 wherein a torrefaction chamber is provided, the biomass is placed in the torrefaction chamber, the biomass is torrefied by passing hot air into the torrefaction chamber, and torrefied waste gas is discharged from the torrefaction chamber; and in the drying process, taking the temperature of the hot air introduced into the drying cavity as the drying temperature.

3. The method of determining biomass torrefaction characteristics of claim 2 wherein the torrefaction conditions further include an amount of hot air introduced into the torrefaction chamber; in the drying process, changing the air quantity of the hot air to form air quantity change data; the air quantity change data are used for forming drying characteristic data with the material state, the weight change data and the drying time;

and/or, in the drying process, changing the drying temperature to form temperature change data; the temperature change data are used for forming drying characteristic data with the material state of the biomass, the weight change data and the drying time.

4. The method for determining biomass torrefaction characteristics according to claim 2, wherein the humidity of the exhaust gas discharged from the torrefaction chamber is acquired in real time during the torrefaction process to form humidity variation data; the humidity change data are used for forming drying characteristic data of the biomass together with the material state of the biomass, the weight change data and the drying conditions.

5. The biomass drying method is characterized by comprising the following steps:

determining the torrefaction characteristic data of the biomass according to the method of determining a torrefaction characteristic of biomass according to any one of claims 1 to 4, determining the torrefaction conditions required for torrefaction of the set material state and the initial weight of biomass to the target weight from the torrefaction characteristic data, and establishing a process parameter library;

Before drying, selecting the required drying conditions from the process parameter library according to the material state and the initial weight of the biomass to be dried;

drying the biomass under the selected drying conditions.

6. Biomass torrefaction device for use in the method of determining torrefaction characteristics of biomass according to any of claims 1 to 4, comprising:

the drying furnace comprises a drying furnace body, wherein a drying cavity is formed in the drying furnace body, the drying furnace body is provided with an air inlet and an air outlet, and the air inlet and the air outlet are respectively communicated with the drying cavity;

the material container is arranged in the drying cavity and used for accommodating biomass to be dried;

the weighing mechanism is supported below the material container;

the biomass drying device comprises a drying cavity, a weighing mechanism, an air inlet, a drying cavity, a drying mechanism, a weighing mechanism and a weighing mechanism, wherein hot air is introduced into the drying cavity from the air inlet to heat and dry the biomass, and the weighing mechanism is used for monitoring the weight of the biomass in real time in the drying process so as to form weight change data.

7. The biomass drying apparatus according to claim 6, wherein the drying oven body comprises a bottom wall and a side wall, the bottom wall and the side wall are surrounded to form the drying cavity, and a limiting hole communicated with the drying cavity is formed in the bottom wall;

The weighing mechanism comprises an electronic scale and a support, the electronic scale is arranged outside the drying cavity and located below the bottom wall, the support penetrates through the limiting hole, one end of the support is located in the drying cavity, the other end of the support is located outside the drying cavity, and the support is used for supporting the bottom of the material container and between the electronic scale.

8. The biomass drying apparatus according to claim 7, wherein a bottom of the material container is provided with a limiting portion, the bracket is abutted to the limiting portion, and the limiting portion is used for limiting a relative position of the bracket and the bottom of the material container.

9. The biomass drying apparatus according to claim 6, further comprising an air distribution member, wherein a plurality of ventilation holes are distributed on the air distribution member;

the number of the air distribution pieces is at least two, a drying area is formed between the weighing mechanism and the adjacent air distribution pieces, and a steady flow area is formed between the adjacent air distribution pieces at intervals, so that hot air entering the drying cavity passes through the steady flow area before entering the drying area.

10. The biomass torrefaction device according to any one of claims 6 to 9, further comprising an air inlet pipe connected to the torrefaction furnace body at the air inlet for introducing hot air from the air inlet into the torrefaction chamber; a temperature monitor and/or a humidity detector are arranged in the air inlet pipe; or, the air inlet pipe is provided with a first monitoring hole, and the first monitoring hole is suitable for a temperature monitor and/or a humidity detector to pass through;

And/or, the biomass drying device further comprises an air outlet pipe, the air outlet pipe is connected to the drying furnace body at the air outlet, and the air outlet pipe is used for discharging drying waste gas from the air outlet to the outside of the drying cavity; a temperature monitor and/or a humidity detector are arranged in the air outlet pipe; or, the air outlet pipe is provided with a second monitoring hole, and the second monitoring hole is suitable for a temperature monitor and/or a humidity detector to pass through.