Biomass particle furnace and temperature control method and temperature control device thereof

Abstract

The invention belongs to the technical field of industrial control, and particularly relates to a biomass particle furnace and a temperature control method and device.The biomass particle furnace comprises a furnace body, a feeding mechanism and an induced draft fan, the feeding mechanism and the induced draft fan are communicated with the furnace body, and the temperature control method comprises the steps that the target air temperature of the induced draft fan is obtained; the initial target furnace temperature in the furnace body is determined according to the target air temperature; a feeding mechanism is controlled to execute feeding operation according to the initial target furnace temperature, so that the temperature in the furnace body reaches the initial target furnace temperature; the current actual air temperature of the induced draft fan is obtained in real time; according to the actual deviation between the current actual air temperature and the target air temperature, fuzzy operation is conducted on the initial target furnace temperature to obtain the final target furnace temperature; and a feeding mechanism is controlled to execute feeding operation according to the final target furnace temperature, so that the actual deviation is within a preset range. By adopting the temperature control method, the air temperature of the hot air output by the biomass particle furnace can be accurately controlled.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial control, and in particular relates to a biomass pellet stove and a temperature control method and a temperature control device thereof. Background Art

[0002] During grain drying, high temperature control is often required due to differences in grain variety, operating area, moisture content, and intended use. However, conventional drying methods often result in high grain breakage and cracking rates.

[0003] Existing grain drying systems typically control the drying temperature directly by controlling the biomass pellet furnace. This is done by presetting the on / off time ratio of the feed mechanism to control the biomass pellet furnace's operating state. When the air temperature exceeds the target output temperature threshold, additional materials are introduced to forcefully cool the air and reduce the intensity of combustion. This crude temperature control method cannot accurately control the hot air temperature output by the biomass pellet furnace, which in turn affects the drying effect. Summary of the Invention

[0004] The object of the present invention is to provide a biomass pellet stove and a temperature control method and a temperature control device thereof, so as to accurately control the temperature of hot air output by the biomass pellet stove.

[0005] In order to achieve the above-mentioned object, the present invention provides a temperature control method of a biomass pellet stove, wherein the biomass pellet stove includes a stove body, a feeding mechanism and an induced draft fan connected to the stove body, and the temperature control method includes: Obtain the target air temperature of the induced draft fan; Determine the initial target furnace temperature in the furnace body according to the target air temperature; Controlling the feeding mechanism to perform a feeding operation according to the initial target furnace temperature so that the temperature inside the furnace body reaches the initial target furnace temperature; Get the current actual air temperature of the induced draft fan in real time; According to the actual deviation between the current actual air temperature and the target air temperature, the initial target furnace temperature is fuzzy-calculated to obtain the final target furnace temperature; The feeding mechanism is controlled to perform feeding operations according to the final target furnace temperature so that the actual deviation is within the preset range.

[0006] In some embodiments, the steps of performing fuzzy operation on the initial target furnace temperature based on the actual deviation between the current actual air temperature and the target air temperature to obtain the final target furnace temperature include: obtaining an upper deviation value of the target air temperature, wherein the actual deviation is the difference between the current actual air temperature and the target air temperature, and the upper deviation value is greater than zero; when the actual deviation meets the first preset condition, reducing the initial target furnace temperature by the first preset temperature to obtain a corrected target furnace temperature; controlling the feeding mechanism to perform the feeding operation according to the corrected target furnace temperature; repeating the steps of: obtaining the current actual air temperature of the induced draft fan in real time until the actual deviation is less than the upper deviation value and remains steady within the first preset time period, thereby obtaining the final target furnace temperature; wherein the first preset condition means that the actual deviation is greater than the upper deviation value, or the actual deviation is greater than half of the upper deviation value and the actual deviation continues to increase within the first preset time period.

[0007] In some embodiments, the steps of performing fuzzy operation on the initial target furnace temperature based on the actual deviation between the current actual air temperature and the target air temperature to obtain the final target furnace temperature include: obtaining a lower deviation value of the target air temperature, wherein the actual deviation is the difference between the actual air temperature and the target air temperature, and the lower deviation value is less than zero; when the actual deviation meets the second preset condition, increasing the initial target furnace temperature by the second preset temperature to obtain a corrected target furnace temperature; controlling the feeding mechanism to perform the feeding operation according to the corrected target furnace temperature; repeating the steps of: obtaining the current actual air temperature of the induced draft fan in real time until the actual deviation is greater than the lower deviation value and remains steady within the second preset time period, thereby obtaining the final target furnace temperature; wherein the second preset condition means that the actual deviation is less than the lower deviation value, or the actual deviation is less than half of the lower deviation value and the actual deviation continues to decrease within the second preset time period.

[0008] In some embodiments, the step of controlling the feeding mechanism to perform a feeding operation according to the final target furnace temperature so that the actual deviation is within a preset range includes: determining an adjustment parameter of the feeding mechanism according to the final target furnace temperature; and adjusting the feeding speed of the feeding mechanism according to the adjustment parameter to adjust the temperature inside the furnace body.

[0009] In some embodiments, the biomass pellet stove is used to provide heat for the dryer, one end of the induced draft fan is connected to the stove body, and the other end of the induced draft fan is connected to the dryer. The step of obtaining the target air temperature of the induced draft fan includes: obtaining the number of dryers and the required drying temperature of each dryer; when the number of dryers is one, determining the target air temperature according to the required drying temperature; when the number of dryers is multiple, determining the target air temperature according to multiple required drying temperatures.

[0010] In some embodiments, when there are multiple dryers, the step of determining the target air temperature based on multiple required drying temperatures includes: determining whether the multiple dryers have their own temperature control mechanism; when the multiple dryers all have their own temperature control mechanism, determining the maximum value of the multiple required drying temperatures as the target air temperature; when the multiple dryers do not have their own temperature control mechanism, determining the minimum value of the multiple required drying temperatures as the target air temperature.

[0011] In some embodiments, the temperature control method also includes the following steps: obtaining the actual furnace temperature in the furnace body in real time; when the absolute value of the difference between the actual furnace temperature and the final target furnace temperature is greater than the preset temperature difference, PID adjustment is performed on the duty cycle of the feeding mechanism until the absolute value of the difference between the steady-state value of the actual furnace temperature and the final target furnace temperature is less than the preset temperature difference.

[0012] A second aspect of the present invention provides a temperature control device for a biomass pellet stove, comprising: a memory configured to store instructions; and a processor configured to call instructions from the memory and implement the above-mentioned temperature control method for the biomass pellet stove when executing the instructions.

[0013] The third aspect of the present invention provides a biomass pellet stove, comprising: a stove body; a feeding mechanism connected to the feeding port of the stove body and used to transport biomass pellets to the stove body; an induced draft fan, one end of which is connected to the gas outlet of the stove body and the other end of which is connected to the outside and used to transport high-temperature gas to the outside; and a temperature control device for the above-mentioned biomass pellet stove.

[0014] A fourth aspect of the present invention provides a machine-readable storage medium having stored thereon instructions for causing a machine to execute the above-mentioned method for controlling the temperature of a biomass pellet stove.

[0015] In the above-mentioned technical solution, the biomass pellet stove includes a stove body, a feeding mechanism connected to the stove body, and an induced draft fan. The feeding mechanism can provide biomass pellet fuel to the stove body, and the induced draft fan can transfer the high-temperature gas inside the stove body to the outside world. The temperature control method includes obtaining the target air temperature of the induced draft fan and determining the initial target furnace temperature inside the stove body based on the target air temperature. The initial target furnace temperature corresponds to the target air temperature. The higher the target air temperature, the higher the corresponding initial target furnace temperature. Subsequently, the feeding mechanism is controlled to perform a feeding operation based on the target furnace temperature so that the temperature inside the stove body reaches the initial target furnace temperature. The stove body temperature is positively correlated with the feeding speed. The faster the feeding, the higher the temperature inside the stove body. The current actual air temperature of the induced draft fan is obtained in real time. Based on the actual deviation between the current actual air temperature and the target air temperature, a fuzzy operation is performed on the initial target stove temperature to obtain the final target stove temperature. Fuzzy operation is a nonlinear operation method that can map the actual deviation value of the input to an output value. This output value is the final target stove temperature. The feed mechanism is controlled to perform the feed operation according to the final target furnace temperature so that the actual deviation between the current actual air temperature and the target air temperature is within a preset range. The above temperature control method can achieve precise control of the air temperature output by the biomass pellet furnace, solving the technical problem of inaccurate air temperature output by biomass pellet furnaces in the prior art.

[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation of the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without inventive work. In the accompanying drawings: Figure 1 A structural block diagram of a biomass pellet stove according to an embodiment of the present invention; Figure 2 This is a flow chart of a temperature control method for a biomass pellet stove according to an embodiment of the present invention; Figure 3 Schematic diagram of group operation of a biomass pellet stove and a dryer according to an embodiment of the present invention; Figure 4 A diagram illustrating the internal structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present invention and are not used to limit the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of the present invention comply with the relevant provisions of national laws and regulations. In the embodiments of the present invention, certain software, components, models, and other existing solutions in the industry may be mentioned. These should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of the present invention, but it does not mean that the applicant has already or necessarily used such solutions.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. The following describes the biomass pellet stove and its temperature control method and temperature control device according to the present invention with reference to the accompanying drawings.

[0022] like Figure 1 As shown in FIG. 1 , it is a structural block diagram of a biomass pellet stove according to an embodiment of the present invention; Figure 2 FIG2 is a flow chart of a temperature control method for a biomass pellet stove according to an embodiment of the present invention. The biomass pellet stove provided by the embodiment of the present invention includes a stove body, a feeding mechanism and an induced draft fan connected to the stove body, and the temperature control method includes: S101, obtaining a target air temperature of an induced draft fan; S102, determining an initial target furnace temperature in the furnace body according to the target air temperature; S103, controlling the feeding mechanism to perform a feeding operation according to the initial target furnace temperature, so that the temperature inside the furnace reaches the initial target furnace temperature; S104, obtaining the current actual air temperature of the induced draft fan in real time; S105: performing a fuzzy operation on the initial target furnace temperature based on the actual deviation between the current actual air temperature and the target air temperature to obtain the final target furnace temperature; S106 , controlling the feeding mechanism to perform a feeding operation according to the final target furnace temperature so that the actual deviation is within a preset range.

[0023] A biomass pellet stove is a heating device that uses biomass as fuel. It uses a specific temperature control method to regulate the temperature within the stove, thereby controlling the output air temperature to meet the drying requirements of different dryers. The biomass pellet stove provided in an embodiment of the present invention includes a stove body, a feed mechanism, and an induced draft fan. The stove body, serving as the main combustion and heating component, contains a combustion chamber and a heat exchange structure that transfers the heat energy generated by the biomass pellet combustion to the air flowing through it, thereby increasing the air temperature. The feed mechanism is connected to the stove body's feed port and is responsible for continuously or intermittently feeding biomass pellets into the stove body to maintain the combustion process within the stove body. The induced draft fan is connected to the stove body's air outlet and extracts high-temperature gas from the stove body and delivers it to equipment requiring heating, such as a dryer, thereby utilizing the heat energy. In the prior art, the air temperature transmitted to the outside world by a biomass pellet stove is imprecise, making it difficult to precisely control. An embodiment of the present invention provides a temperature control method for a biomass pellet stove to precisely regulate the output air temperature of the stove.

[0024] In this embodiment of the present invention, a target air temperature for the induced draft fan (IDF) is first acquired. This target air temperature is set based on the actual heating requirements of the equipment being heated and is used to guide the combustion and heating process of the biomass pellet furnace. Subsequently, an initial target furnace temperature is determined based on the correspondence between the target air temperature and the temperature within the furnace body. This initial target furnace temperature is the desired furnace body temperature, allowing the air delivered to the IDF fan to be heated to the target air temperature through heat exchange. After determining the initial target furnace temperature, the feed mechanism is controlled to execute the feed operation according to a preset feed strategy. The feed mechanism adjusts the feed rate and other methods based on the initial target furnace temperature to control the combustion intensity and temperature within the furnace body. By precisely controlling the feed rate and other methods, the temperature within the furnace body can gradually approach and stabilize at the initial target furnace temperature. After the furnace body temperature reaches the initial target furnace temperature, the current actual air temperature of the IDF is acquired in real time. This current actual air temperature is measured when the IDF fan extracts high-temperature gas from the furnace body and transmits it to the outside world. The current actual air temperature is compared with the target air temperature to obtain the actual deviation. Based on the magnitude of the actual deviation, a fuzzy operation is performed on the initial target furnace temperature. Fuzzy operation is an operation method based on fuzzy logic and fuzzy sets, which can handle uncertainty and ambiguity problems. Through fuzzy operation, a more accurate final target furnace temperature can be obtained, which can minimize the deviation between the current actual air temperature and the target air temperature. After obtaining the final target furnace temperature, the feeding mechanism is controlled again to perform the feeding operation according to the final target furnace temperature. By adjusting the feeding speed and the furnace body temperature, the current actual air temperature gradually approaches and eventually stabilizes near the target air temperature. The above-mentioned temperature control method can achieve precise control of the air temperature output by the biomass pellet furnace, thereby improving the effect of the drying operation.

[0025] In one embodiment, the steps of performing fuzzy operation on the initial target furnace temperature according to the actual deviation between the current actual air temperature and the target air temperature to obtain the final target furnace temperature include: obtaining an upper deviation value of the target air temperature, wherein the actual deviation is the difference between the current actual air temperature and the target air temperature, and the upper deviation value is greater than zero; when the actual deviation meets the first preset condition, reducing the initial target furnace temperature by the first preset temperature to obtain a corrected target furnace temperature; controlling the feeding mechanism to perform the feeding operation according to the corrected target furnace temperature; repeating the steps of: obtaining the current actual air temperature of the induced draft fan in real time until the actual deviation is less than the upper deviation value and remains steady within the first preset time period, thereby obtaining the final target furnace temperature; wherein the first preset condition means that the actual deviation is greater than the upper deviation value, or the actual deviation is greater than half of the upper deviation value and the actual deviation continues to increase within the first preset time period.

[0026] When performing fuzzy calculations, the temperature control method provided by an embodiment of the present invention first obtains the upper and lower deviation values of the target air temperature. These two deviation values are used to describe the degree to which the current actual air temperature is higher or lower than the target air temperature, respectively. During the fuzzy calculation process, the initial target furnace temperature is dynamically adjusted based on the comparison results of the actual deviation with the upper or lower deviation values, as well as the trend of the deviation changes, until the actual deviation converges to an acceptable range, and the final target furnace temperature is obtained. This method can more finely control the furnace temperature and improve the accuracy and stability of temperature control. Among them, the upper deviation value is a positive number, and the lower deviation value is a negative number.

[0027] Specifically, if the current actual air temperature is greater than the upper deviation value, or the actual deviation is greater than half of the upper deviation value and the actual deviation continues to increase within a first preset time period, the actual deviation is determined to be large, and the furnace temperature may need to be lowered to reduce heat output. Therefore, the initial target furnace temperature is reduced by the first preset temperature to obtain a revised target furnace temperature. The feed mechanism is then controlled to adjust the feed rate and feed amount based on this revised target furnace temperature to reduce combustion intensity and temperature within the furnace. The system then again obtains the current actual air temperature from the induced draft fan in real time and compares it with the target air temperature to obtain a new actual deviation. This process is repeated until the actual deviation is less than the upper deviation value and remains steady within the first preset time period. At this point, the system is considered to have reached a stable state, and the furnace temperature at this point is used as the final target furnace temperature. This method, by continuously adjusting the target furnace temperature based on the actual deviation, allows the air temperature output by the biomass pellet furnace to be more accurately controlled near the target temperature, improving the accuracy and stability of temperature control. The first preset time period can be 30 seconds, and the first preset temperature can be 5°C.

[0028] Similarly, when the current actual air temperature is less than the upper deviation value, or the actual deviation is less than half of the upper deviation value and the actual deviation continues to increase within the second preset time period, it is judged that the actual deviation is large and the furnace temperature may need to be increased to improve heat output. Therefore, the initial target furnace temperature is increased by the second preset temperature to obtain an adjusted target furnace temperature. Subsequently, the feed mechanism is controlled to adjust the feed speed and feed amount according to this adjusted target furnace temperature to increase the combustion intensity and temperature in the furnace. Next, the system again obtains the current actual air temperature of the induced draft fan in real time and compares it with the target air temperature to obtain a new actual deviation. This process is also repeated until the actual deviation is greater than the lower deviation value and remains steady within the second preset time period. At this time, it is considered that the system has reached a new stable state, and the furnace temperature at this time is used as the new target furnace temperature. Among them, the second preset time period can be set according to actual conditions. For example, it can be selected as 45 seconds, and the second preset temperature can be selected as 6°C.

[0029] In one embodiment, the step of controlling the feeding mechanism to perform a feeding operation according to the final target furnace temperature so that the actual deviation is within a preset range includes: determining the adjustment parameters of the feeding mechanism according to the final target furnace temperature; and adjusting the feeding speed of the feeding mechanism according to the adjustment parameters to adjust the temperature inside the furnace body. The temperature inside the furnace body is positively correlated with the feeding speed of the feeding mechanism, and the corresponding feeding speed adjustment range can be determined according to the final target furnace temperature. In a specific implementation, a basic feeding speed can be set first, and then the feed speed increment that needs to be adjusted can be calculated based on the difference between the final target furnace temperature and the initial target furnace temperature. If the final target furnace temperature is higher than the initial target furnace temperature, the feeding speed is increased; if the final target furnace temperature is lower than the initial target furnace temperature, the feeding speed is reduced. In this way, precise control of the temperature inside the furnace body can be achieved, so that the actual deviation remains within the preset range.

[0030] In one embodiment, Figure 3 Figure 2 shows a schematic diagram of a biomass pellet stove and dryer operating in a group according to an embodiment of the present invention. The biomass pellet stove is used to heat the dryer. One end of the induced draft fan is connected to the stove body, and the other end is connected to the dryer. The steps of obtaining the target air temperature for the induced draft fan include: obtaining the number of dryers and the required drying temperature for each dryer; determining the target air temperature based on the number and the required drying temperature; if there is only one dryer, determining the target air temperature based on the required drying temperature; if there are multiple dryers, determining the target air temperature based on the required drying temperature. The induced draft fan serves as a bridge connecting the stove body and the dryer, providing stable high-temperature air to the dryers. In specific applications, the biomass pellet stove may provide heat energy for a single dryer or for multiple dryers simultaneously. Therefore, when determining the target air temperature, the heating requirements of all dryers must be considered. First, the number of all dryers requiring heating and the specific drying temperature required for each dryer are obtained. This information can be obtained through the biomass pellet stove control system or user input. Subsequently, a comprehensive analysis and calculation is performed based on the number of dryers and their respective required drying temperatures. If only one dryer requires heating, the target air temperature is determined directly based on the required drying temperature for that dryer. In this case, the target air temperature should be set to meet the drying requirements of that dryer to ensure effective and efficient drying. If multiple dryers require heating simultaneously, the required drying temperatures for all dryers must be comprehensively considered. This temperature control method allows for precise matching of the needs of multiple dryers, ensuring that each dryer receives the required high-temperature air to meet the drying temperature requirements.

[0031] In one embodiment, when there are multiple dryers, the step of determining the target air temperature based on multiple required drying temperatures includes: determining whether the multiple dryers have their own temperature control mechanism; when the multiple dryers all have their own temperature control mechanism, determining the maximum value of the multiple required drying temperatures as the target air temperature; when the multiple dryers do not have their own temperature control mechanism, determining the minimum value of the multiple required drying temperatures as the target air temperature.

[0032] When multiple dryers have their own temperature control mechanisms, for example, if they have temperature control components, they can fine-tune the temperature based on the incoming air temperature to accommodate different drying needs. Therefore, when multiple dryers have temperature control mechanisms, to ensure that all dryers receive sufficiently high-temperature air, it's reasonable to set the target air temperature as the maximum of the multiple required drying temperatures. This ensures that even the dryers with the highest temperature requirements can meet their needs, while other dryers can adjust appropriately using their own temperature control mechanisms. If dryers don't have their own temperature control mechanisms, setting the maximum of the multiple required drying temperatures as the target air temperature could damage some dryers due to excessive temperatures or produce suboptimal drying results. Therefore, when multiple dryers don't have their own temperature control mechanisms, setting the target air temperature as the minimum of the multiple required drying temperatures is a more reliable option. This ensures that all dryers operate within a safe temperature range and meet basic drying needs.

[0033] In addition, if some dryers have a temperature control mechanism and some dryers do not, the user needs to adaptively adjust the target air temperature based on the parameters of multiple dryers so that all dryers can operate within a safe and efficient temperature range.

[0034] In one embodiment, the temperature control method further comprises the following steps: obtaining the actual furnace temperature within the furnace in real time; and, if the absolute value of the difference between the actual furnace temperature and the final target furnace temperature exceeds a preset temperature difference, performing PID control on the duty cycle of the feed mechanism until the absolute value of the difference between the steady-state actual furnace temperature and the final target furnace temperature is less than the preset temperature difference. The temperature within the furnace and the feed rate of the feed mechanism exhibit a nonlinear positive correlation. Therefore, when adjusting the actual furnace temperature by adjusting the feed rate, deviations between the actual furnace temperature and the final target furnace temperature often occur. To maintain a relatively stable actual furnace temperature within the furnace, this embodiment of the present invention also incorporates a PID (proportional-integral-derivative) control algorithm to adjust the duty cycle of the feed mechanism. The duty cycle refers to the ratio of the operating time of the feed mechanism to the total operating time within a cycle. By adjusting the duty cycle, the feed rate can be further precisely controlled, thereby achieving fine-tuning of the furnace temperature.

[0035] After obtaining the actual furnace temperature in real time, the system compares it with the target temperature and calculates the absolute value of the difference. If the absolute value of the difference is greater than the preset temperature difference, it is considered that there is a significant deviation between the current and target temperatures, and adjustment measures are required. At this point, the PID control algorithm is activated to calculate the duty cycle that should be adjusted.

[0036] By adjusting the duty cycle of the feed mechanism through a PID control algorithm, precise control of the furnace temperature can be achieved, allowing the actual furnace temperature to gradually stabilize near the final target temperature. When the absolute difference between the steady-state actual furnace temperature and the final target temperature is less than the preset temperature difference, the system is considered to have reached a stable state. Duty cycle adjustment can then be stopped, maintaining the current feed rate and furnace temperature. Duty cycle adjustment is independent of feed rate adjustment. When both feed rate and duty cycle require adjustment, there is no need to prioritize them; both can adjust the actual furnace temperature. The feed rate is achieved by adjusting the feed mechanism's motor speed, while the duty cycle is achieved by adjusting the percentage of time the feed mechanism operates within a single operating cycle. Duty cycle adjustment can serve as a supplement to feed rate adjustment and a means of fine-tuning, resulting in more precise and stable temperature control within the furnace.

[0037] The temperature control method combining the above-mentioned PID control algorithm with fuzzy operation can further improve the accuracy and stability of biomass pellet furnace temperature control, meet the drying requirements of different dryers, and improve the effect and efficiency of drying operations.

[0038] In one embodiment, a temperature control device for a biomass pellet stove is provided, comprising: a memory configured to store instructions; and a processor configured to call instructions from the memory and implement the above-mentioned temperature control method for the biomass pellet stove when executing the instructions.

[0039] In one embodiment, a biomass pellet stove is provided, comprising: a stove body; a feeding mechanism connected to the feeding port of the stove body and used to convey biomass pellets to the stove body; an induced draft fan, one end of which is connected to the gas outlet of the stove body and the other end of which is connected to the outside and used to convey high-temperature gas to the outside; and a temperature control device for the above-mentioned biomass pellet stove.

[0040] In one embodiment, a machine-readable storage medium is provided, on which instructions are stored, and the instructions are used to enable a machine to execute the above-mentioned temperature control method for the biomass pellet stove.

[0041] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 4As shown. The computer device includes a processor, a network interface, a memory (not shown in the figure) and a database (not shown in the figure) connected through a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes an internal memory and a non-volatile storage medium. The non-volatile storage medium stores an operating system, a computer program and a database (not shown in the figure). The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a temperature control method for a biomass pellet stove is implemented.

[0042] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0043] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0044] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0045] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0046] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0047] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0048] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can be implemented using any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change RAM (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0049] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0050] The above are merely embodiments of the present invention and are not intended to limit the present invention. It will be apparent to those skilled in the art that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are intended to be included within the scope of the claims of the present invention.

Claims

1. A temperature control method for a biomass pellet stove, characterized in that: The biomass pellet furnace includes a furnace body, a feeding mechanism and an induced draft fan connected to the furnace body, and the temperature control method includes: Obtaining a target air temperature of the induced draft fan; determining an initial target furnace temperature in the furnace body according to the target air temperature; controlling the feeding mechanism to perform a feeding operation according to the initial target furnace temperature so that the temperature inside the furnace body reaches the initial target furnace temperature; Obtaining the current actual air temperature of the induced draft fan in real time; Performing a fuzzy operation on the initial target furnace temperature according to an actual deviation between the current actual air temperature and the target air temperature to obtain a final target furnace temperature; The feeding mechanism is controlled to perform a feeding operation according to the final target furnace temperature so that the actual deviation is within a preset range.

2. The temperature control method of the biomass pellet stove according to claim 1, characterized in that: The step of performing fuzzy operation on the initial target furnace temperature according to the actual deviation between the current actual air temperature and the target air temperature to obtain the final target furnace temperature includes: Obtaining an upper deviation value of the target air temperature, wherein the actual deviation is the difference between the current actual air temperature and the target air temperature, and the upper deviation value is greater than zero; When the actual deviation satisfies a first preset condition, reducing the initial target furnace temperature by a first preset temperature to obtain a corrected target furnace temperature; controlling the feeding mechanism to perform a feeding operation according to the corrected target furnace temperature; Repeat the steps of: obtaining the current actual air temperature of the induced draft fan in real time until the actual deviation is less than the upper deviation value and remains steady within a first preset time period, thereby obtaining the final target furnace temperature; The first preset condition refers to that the actual deviation is greater than the upper deviation value, or the actual deviation is greater than half of the upper deviation value and the actual deviation continues to increase within a first preset time period.

3. The temperature control method of the biomass pellet stove according to claim 1, characterized in that: The step of performing fuzzy operation on the initial target furnace temperature according to the actual deviation between the current actual air temperature and the target air temperature to obtain the final target furnace temperature includes: Obtaining a lower deviation value of the target air temperature, wherein the actual deviation is the difference between the current actual air temperature and the target air temperature, and the lower deviation value is less than zero; When the actual deviation satisfies a second preset condition, increasing the initial target furnace temperature by a second preset temperature to obtain a corrected target furnace temperature; Controlling the feeding mechanism to perform a feeding operation according to the corrected target furnace temperature; Repeat the steps of: obtaining the current actual air temperature of the induced draft fan in real time until the actual deviation is greater than the lower deviation value and remains steady within a second preset time period, thereby obtaining the final target furnace temperature; The second preset condition refers to that the actual deviation is less than the lower deviation value, or the actual deviation is less than half of the lower deviation value and the actual deviation continues to decrease within a second preset time period.

4. The temperature control method of the biomass pellet stove according to claim 1, characterized in that: The step of controlling the feeding mechanism to perform the feeding operation according to the final target furnace temperature so that the actual deviation is within a preset range includes: determining adjustment parameters of the feeding mechanism according to the final target furnace temperature; The feeding speed of the feeding mechanism is adjusted according to the adjustment parameter to adjust the temperature in the furnace body.

5. The temperature control method of the biomass pellet stove according to claim 1, characterized in that: The biomass pellet furnace is used to provide heat for the dryer, one end of the induced draft fan is connected to the furnace body, and the other end of the induced draft fan is connected to the dryer, and the step of obtaining the target air temperature of the induced draft fan includes: Obtaining the number of the dryers and the required drying temperature of each dryer; When there is only one dryer, determining the target air temperature according to the required drying temperature; When there are multiple dryers, the target air temperature is determined according to the multiple required drying temperatures.

6. The temperature control method of the biomass pellet stove according to claim 5, characterized in that: When there are multiple dryers, the step of determining the target air temperature according to the multiple required drying temperatures includes: determining whether the plurality of dryers have their own temperature regulation mechanisms; In the case where the plurality of dryers all have their own temperature adjustment mechanism, the maximum value among the plurality of required drying temperatures is determined as the target air temperature; In the case that none of the plurality of dryers has its own temperature adjustment mechanism, the minimum value among the plurality of required drying temperatures is determined as the target air temperature.

7. The temperature control method of a biomass pellet stove according to any one of claims 1 to 6, characterized in that: The temperature control method further comprises the following steps: Real-time acquisition of the actual furnace temperature in the furnace body; When the absolute value of the difference between the actual furnace temperature and the final target furnace temperature is greater than the preset temperature difference, the duty cycle of the feeding mechanism is PID adjusted until the absolute value of the difference between the steady-state value of the actual furnace temperature and the final target furnace temperature is less than the preset temperature difference.

8. A temperature control device for a biomass pellet stove, characterized in that: include: a memory configured to store instructions; as well as The processor is configured to call the instruction from the memory and implement the temperature control method of the biomass pellet stove according to any one of claims 1 to 7 when executing the instruction.

9. A biomass pellet stove, characterized in that: include: furnace body; a feeding mechanism, connected to the feeding port of the furnace body and used for conveying biomass particles into the furnace body; An induced draft fan, one end of which is connected to the gas outlet of the furnace body, and the other end of which is connected to the outside and is used to transport high-temperature gas to the outside; The temperature control device for the biomass pellet stove according to claim 8.

10. A machine-readable storage medium, characterized in that The machine-readable storage medium stores instructions for enabling a machine to execute the temperature control method for a biomass pellet stove according to any one of claims 1 to 7.

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