Biomass fuel drying system, equipment and method coupled with thermal power generation boiler

Abstract

The invention relates to the field of biomass energy utilization, in particular to a biomass fuel drying system, equipment and method coupled with a thermal power generation boiler, and the biomass fuel drying system comprises a heat exchanger and a drying device which are connected with a boiler steam waste heat outlet or a flue gas waste heat outlet; the drying device comprises a heat exchange pipe, the hot end of the heat exchange pipe is connected with the cold end of the heat exchanger, and a cold end outlet is connected with the heat exchanger. A drying cylinder is arranged outside the heat exchange tube in a sleeving manner and is connected with a driving device; a spiral baffle is arranged in a cavity between the drying cylinder and the heat exchange pipe in the axial direction. A biomass fuel input port and a biomass fuel outlet are formed in the drying cylinder, the biomass fuel input port is connected with a biomass fuel source, and the biomass fuel outlet is connected with the fuel input end of the boiler, the system is simple in structure, resource utilization of energy is achieved, the biomass fuel drying efficiency is improved, and the energy consumption is reduced. The problems that existing biomass fuel drying is high in energy consumption and low in efficiency are solved.

Description

Technical Field

[0001] The present invention relates to the field of biomass energy utilization, and particularly to a biomass fuel drying system, equipment and method coupled with a thermal power generation boiler. Background Art

[0002] Biomass fuel is a solid, liquid or gaseous fuel converted from renewable biomass such as agricultural and forestry waste, animal and plant oils through physical or chemical methods. Biomass fuel fixes carbon dioxide through photosynthesis, and the amount of CO2 released during combustion is basically equivalent to the amount of CO2 absorbed during plant growth, forming a carbon cycle. The greenhouse gas emissions are much lower than those of fossil fuels, and the sulfur and nitrogen contents are low, so the emissions of pollutants such as sulfur dioxide and nitrogen oxides during combustion are significantly reduced. It has the characteristics of renewability and low-carbon environmental protection. The raw materials of biomass fuel are widely sourced, including agricultural waste, forestry waste, urban organic waste, etc., which can effectively solve environmental problems such as rural straw burning and urban waste treatment. With technological progress and large-scale production, the cost of biomass fuel has gradually decreased, and it has become economically competitive with fossil fuels in some scenarios. Therefore, biomass fuel has the characteristics of renewability, low-carbon environmental protection, rich resources and controllable costs, and has important value in energy transformation and environmental protection. Especially in the fields of power and heat supply, biomass fuel is often sent into the boiler for co-combustion with coal, using existing coal-fired power generation facilities to reduce costs and coal consumption.

[0003] However, the raw materials of biomass fuel usually contain a high moisture content. The high moisture content causes a large amount of heat to be absorbed for water evaporation during the combustion of biomass fuel. At the same time, the volume of flue gas increases after the combustion of high-moisture-content fuel, and the heat loss carried away by the flue gas increases significantly, reducing the combustion efficiency of biomass fuel. Moreover, the generated water vapor will reduce the furnace temperature and form an oxygen barrier, hindering the full mixing of the flame and oxygen, causing oxygen deficiency during combustion. At the same time, the fluidity of fuel particles becomes poor and they are prone to accumulate and agglomerate, triggering abnormal conditions such as furnace explosion and positive pressure, and even causing combustion interruption, resulting in equipment wear and safety hazards.

[0004] Therefore, before the biomass fuel is burned, the biomass fuel raw material needs to be crushed and dried to improve the biomass combustion efficiency and reduce the impact of moisture on the combustion efficiency and equipment. The existing drying method of biomass fuel usually uses a special drying device, and a heating structure and a hot air circulation structure are arranged in the drying device to dry the biomass fuel. For example, the Chinese utility model with the authorized publication number CN219674663U discloses a biomass fuel drying device, which includes a base. Four load-bearing members are arranged at the top of the base. A drying furnace is arranged at the top of the load-bearing members. A circulation cavity is arranged outside the drying furnace. A number of circulation holes are arranged inside the circulation cavity. In this utility model, an air pump is provided. The air pump pumps hot air from the discharge box into the drying box through a connecting pipe. The calcium chloride powder in the drying box can absorb the moisture in the hot air. The hot air is heated by a heating device and then enters the air pump through an air inlet pipe. Finally, it enters the circulation cavity through an air outlet pipe and returns to the drying furnace through the circulation holes, and the hot air is recycled to avoid heat waste. Moreover, the hot air blows out from the circulation holes on the inner cavity wall of the circulation cavity, just blowing out from the biomass fuel and fully contacting with the biomass fuel, enhancing the drying efficiency. However, this drying method not only requires additional energy support but also has the problem of low drying efficiency. Summary of the Invention

[0005] Aiming at the problems of high energy consumption and low efficiency in the drying of biomass fuel in the prior art, the present invention provides a biomass fuel drying system, equipment and method coupled with a thermal power generation boiler.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a biomass fuel drying system coupled with a thermal power generation boiler, which includes a heat exchanger and a drying device connected in sequence to the steam waste heat outlet or the flue gas waste heat outlet of the boiler; the drying device includes a heat exchange tube, and the hot end of the heat exchange tube is connected to the cold end of the heat exchanger; the cold end outlet of the heat exchange tube is connected to the heat exchanger; a drying cylinder is sleeved outside the heat exchange tube, and the drying cylinder is connected with a driving device for driving the drying cylinder to rotate outside the heat exchange tube; a spiral baffle is arranged axially in the cavity between the drying cylinder and the heat exchange tube; a biomass fuel inlet and a biomass fuel outlet are arranged on the drying cylinder, the biomass fuel inlet is connected to a biomass fuel source, and the biomass fuel outlet is connected to the fuel input end of the boiler.

[0007] Optionally, the heat exchanger is connected to the steam waste heat outlet of the boiler, and the steam pressure at the steam waste heat outlet of the boiler is 0.3 - 0.6 MPa, and the temperature is 240°C - 270°C.

[0008] Optionally, bearings are arranged between the heat exchange tube and the drying cylinder.

[0009] Optionally, a raw material conveying device is provided between the biomass fuel input port and the biomass fuel source for conveying the biomass fuel from the biomass fuel source into the drying cylinder.

[0010] Optionally, a biomass fuel bin is provided between the biomass fuel outlet and the boiler.

[0011] Optionally, a biomass fuel output device is provided at the biomass fuel outlet for outputting the dried biomass fuel to the boiler for combustion.

[0012] Optionally, a circulation pump is provided at the cold end outlet of the heat exchange tube for pumping the heat-exchanged medium to the heat exchanger for circulating heat exchange.

[0013] An electric power and heat supply device includes the biomass fuel drying system of the above-mentioned coupled thermoelectric power generation boiler.

[0014] A drying method using the biomass fuel drying system of the above-mentioned coupled thermoelectric power generation boiler includes: Crushing the biomass fuel; Conveying the crushed biomass fuel into the drying cylinder and driving the drying cylinder to rotate; Conveying the waste heat of the flue gas or steam inside the boiler to the heat exchanger for heat exchange, and conveying the heat-exchanged medium in the heat exchanger into the heat exchange tube to exchange heat with the biomass fuel in the drying cylinder to complete the drying of the biomass fuel.

[0015] Optionally, after crushing the biomass fuel, the moisture content of the biomass fuel needs to be tested; Adjust the installation angle and rotation speed of the drying cylinder according to the moisture content of the biomass fuel.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a biomass fuel drying system coupled with a thermoelectric power generation boiler. Through the setting of a heat exchanger connected to the waste heat outlet of the boiler flue gas or steam waste heat and a drying device, the waste heat of the boiler can be resourcefully utilized through the heat exchange of the heat exchanger, and then through the internal heat exchange tubes of the drying device, with a drying cylinder arranged outside the heat exchange tubes, the waste heat of the boiler is used for drying biomass fuel, which avoids the energy waste caused by the direct discharge of boiler waste heat, improves the overall energy utilization efficiency, reduces the energy consumption in the thermoelectric power generation process, conforms to the development trend of energy conservation and emission reduction, and realizes the cascade utilization of energy. The waste heat temperature of the boiler is relatively high, and it is used for the process link of drying biomass fuel, which has relatively less stringent temperature requirements, giving full play to the applicability of different quality energy sources, and enabling the reasonable distribution and efficient utilization of energy in different links. At the same time, during the drying process, the drying cylinder rotates outside the heat exchange tubes to transfer biomass fuel and exchange heat with the internal heat exchange tubes. This design increases the contact area and contact time for the biomass fuel to transfer heat with the heat exchange tubes. The spiral baffles arranged axially in the cavity between the drying cylinder and the heat exchange tubes can guide the biomass fuel to move forward spirally in the drying cylinder, extending the residence time of the biomass fuel in the drying cylinder, enabling the biomass fuel to fully absorb the heat transferred by the heat exchange tubes, thereby greatly improving the drying efficiency and ensuring that the biomass fuel reaches the ideal drying degree. Among them, the spiral baffles not only play the role of extending the residence time, but also can evenly distribute and turn over the biomass fuel in the drying cylinder, avoiding local overheating or uneven drying, ensuring the stability of the drying quality of the biomass fuel, and being beneficial to the stable combustion in the boiler subsequently. The entire drying process does not require additional heaters for assistance, which can greatly reduce energy consumption. The system structure is simple. Through the close coupling of the drying system with the thermoelectric power generation boiler, it is compact, reducing the additional equipment floor space and complex connecting pipelines, lowering the construction cost and installation difficulty of the system. At the same time, the high system integration is also conducive to realizing centralized control and management, improving the automatic operation level of the system, reducing manual operation and intervention, and lowering the operation cost, providing strong support for the efficient utilization of biomass fuel and contributing to the wide application of biomass energy in the field of thermoelectric power generation.

[0017] The heat exchanger is connected to the waste heat outlet of the boiler steam. The steam pressure at the waste heat outlet of the boiler steam is 0.3 - 0.6 MPa, and the temperature is 240°C - 270°C. The waste heat of the steam within this pressure and temperature range has a relatively high energy quality, which can provide a continuous and stable heat source for the heat exchanger, ensuring that the heat exchanger can continuously and efficiently transfer the heat of the steam to the drying device, thereby guaranteeing the stability and continuity of the biomass fuel drying process and avoiding problems such as poor drying effect or production interruption caused by heat source fluctuations. In addition, this temperature range can rapidly increase the internal temperature of the biomass fuel, accelerate the evaporation of water molecules, and improve the drying efficiency. At the same time, it will not cause adverse reactions such as pyrolysis and carbonization of the biomass fuel due to excessive temperature, ensuring that the chemical properties and physical structure of the biomass fuel are not damaged, thus maintaining its good quality as a fuel.

[0018] A bearing is provided between the heat exchange tube and the drying cylinder. The setting of the bearing can not only provide stable support for the heat exchange tube but also ensure the continuous rotation of the drying cylinder, enhancing the stability of the entire system. At the same time, it can effectively reduce the vibration and noise generated during the relative movement between the heat exchange tube and the drying cylinder.

[0019] A raw material conveying device is provided between the biomass fuel input port and the biomass fuel source for conveying the biomass fuel from the biomass fuel source into the drying cylinder. The raw material conveying device can continuously and stably convey the biomass fuel from the fuel source into the drying cylinder, ensuring the continuity of the drying process. At the same time, the conveying device can accurately control the conveying amount of the biomass fuel according to the actual needs of the drying system. By adjusting parameters such as the running speed and frequency of the conveying device, precise adjustment of the feeding amount can be achieved, ensuring that the amount of biomass fuel in the drying cylinder is always in the optimal state, avoiding insufficient drying caused by excessive feeding or equipment idleness caused by insufficient feeding, and improving the operating efficiency and stability of the system.

[0020] A biomass fuel bin is provided between the biomass fuel outlet and the boiler. The operation of the drying system may be affected by various factors, such as equipment failures and maintenance and repairs, resulting in fluctuations in the output of the biomass fuel. The boiler usually requires a stable and continuous fuel supply to maintain normal combustion and power generation processes. The biomass fuel bin is like a "reservoir" that can store a certain amount of dried biomass fuel and provide fuel for the boiler in a timely manner when the drying system has insufficient feeding, ensuring the continuity and stability of the boiler combustion and avoiding shutdown accidents caused by fuel supply interruption. At the same time, the biomass fuel bin can flexibly adjust the output amount of the fuel according to the actual needs of the boiler, playing a buffering and regulating role to ensure that the boiler can obtain a stable fuel supply under different operating conditions.

[0021] A biomass fuel outlet is provided with a biomass fuel output device for outputting the dried biomass fuel to a boiler for combustion. The biomass fuel output device can continuously and stably transport the dried fuel to the boiler according to the combustion demand of the boiler.

[0022] A circulation pump is provided at the cold end outlet of the heat exchange tube for pumping the heat-exchanged medium to the heat exchanger for circulating heat exchange. The circulation pump can provide sufficient power for the heat-exchanged medium to make it flow rapidly in the heat exchange system, so that the medium can rapidly circulate between the heat exchange tube and the heat exchanger, improving the heat transfer efficiency. At the same time, the continuous circulation of the circulation pump can maintain the temperature gradient of the medium between the heat exchange tube and the heat exchanger, ensuring that the low-temperature medium at the cold end outlet can be timely transported to the heat exchanger to fully exchange heat with the high-temperature medium, thus ensuring a large heat exchange temperature difference and improving the heat exchange efficiency.

[0023] An electric power and heat supply device includes the biomass fuel drying system of the above-mentioned coupled thermoelectric power generation boiler. This electric power and heat supply device is coupled with the biomass fuel drying system, and the waste heat is used for drying the biomass fuel, not only realizing the step-by-step utilization of the boiler waste heat, improving the energy utilization rate of the whole device, giving full play to the applicability of different quality energies, and enabling the reasonable distribution and efficient utilization of energy in different links. Moreover, it can effectively dry the biomass fuel, improve the combustion performance of the biomass fuel, with low equipment operation cost, and realize the sustainable development of energy.

[0024] A drying method using the biomass fuel drying system of the above-mentioned coupled thermoelectric power generation boiler. This method crushes the biomass fuel, transports it into the drying cylinder, and drives the drying cylinder to rotate. The waste heat of the flue gas or steam in the boiler is transported to the heat exchanger for heat exchange, and the heat-exchanged medium in the heat exchanger is transported into the heat exchange tube to exchange heat with the biomass fuel in the drying cylinder to complete the drying of the biomass fuel. By crushing the biomass fuel and transporting it into the rotating drying cylinder, this method uses the rotation of the drying cylinder to promote the continuous tumbling and mixing of the fuel while exchanging heat with the medium in the heat exchange tube to evaporate moisture, realizing uniform and efficient drying of the biomass fuel, making full use of the waste heat of the flue gas or steam generated by the thermoelectric power generation boiler, improving the comprehensive utilization rate of energy, reducing energy consumption, with a simple method and low drying cost, and achieving the improvement of drying efficiency while enhancing the resource utilization rate.

[0025] After crushing the biomass fuel, it is necessary to test the moisture content of the biomass fuel; according to the moisture content of the biomass fuel, adjust the installation angle and rotation speed of the drying cylinder. Biomass fuels with different moisture contents have significantly different drying characteristics. High-moisture fuels require longer drying times and more intense heat exchange, while low-moisture fuels dry relatively quickly. By first testing the moisture content and then adjusting the installation angle and rotation speed of the drying cylinder accordingly, the drying process can be more precisely adapted to the actual drying needs of the fuel. Brief Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a biomass fuel drying system coupled with a thermal power generation boiler according to the present invention.

[0027] Figure 2 It is a schematic flow diagram of a biomass fuel drying method coupled with a thermal power generation boiler according to the present invention.

[0028] Among them, 1 - boiler, 2 - heat exchanger, 3 - drying device, 31 - heat exchange tube, 32 - drying cylinder, 33 - driving device, 34 - biomass fuel input port, 35 - biomass fuel output port, 36 - spiral baffle. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0031] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0032] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0033] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0034] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "connected" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] The following further elaborates on the present invention with specific embodiments, which is an explanation rather than a limitation of the present invention.

[0036] The present invention discloses a biomass fuel drying system coupled with a thermal power generation boiler. Refer to Figure 1 , including See Figure 1 , the present invention provides a biomass fuel drying system coupled with a thermal power generation boiler, including a heat exchanger 2 and a drying device 3; The heat exchanger 2 is connected to the steam waste heat outlet or the flue gas waste heat outlet of the boiler 1; preferably, the heat exchanger 2 is connected to the steam waste heat outlet of the boiler 1, and the steam pressure at the steam waste heat outlet of the boiler 1 is 0.3 - 0.6 MPa, and the temperature is 240°C - 270°C. The steam waste heat within this pressure and temperature range has a high energy quality, which can provide a continuous and stable heat source for the heat exchanger 2, ensuring that the heat exchanger 2 can continuously and efficiently transfer the heat of the steam to the drying device 3, thereby ensuring the stability and continuity of the biomass fuel drying process and avoiding problems such as poor drying effect or production interruption caused by heat source fluctuations.

[0037] The drying device 3 is connected to the cold end of the heat exchanger 2 and includes a heat exchange tube 31, a drying cylinder 32, a driving device 33, a biomass fuel inlet 34, a biomass fuel outlet 35, and a spiral baffle 36; the hot end of the heat exchange tube 31 is connected to the cold end of the heat exchanger 2; the cold end outlet of the heat exchange tube 31 is connected to the heat exchanger 2; the drying cylinder 32 is sleeved outside the heat exchange tube 31 and is connected to the moving end of the driving device 33, and the driving device 33 is used to drive the drying cylinder 32 to rotate outside the heat exchange tube 31; the spiral baffle 36 is arranged in the cavity between the drying cylinder 32 and the heat exchange tube 31 and is connected to the inside of the drying cylinder 32; the biomass fuel inlet 34 and the biomass fuel outlet 35 are respectively arranged at both ends of the drying cylinder 32, the biomass fuel inlet 34 is connected to a biomass fuel source, and the biomass fuel outlet 35 is connected to the fuel input end of the boiler 1; preferably, a bearing is arranged between the heat exchange tube 31 and the drying cylinder 32; a raw material conveying device is arranged between the biomass fuel inlet 34 and the biomass fuel source for conveying the biomass fuel from the biomass fuel source into the drying cylinder 32; a biomass fuel bin is arranged between the biomass fuel outlet 35 and the boiler 1; the biomass fuel outlet 35 is provided with a biomass fuel output device for outputting the dried biomass fuel to the boiler 1 for combustion; a circulating pump is arranged at the cold end outlet of the heat exchange tube 31 for pumping the heat-exchanged medium to the heat exchanger 2 for circulating heat exchange.

[0038] A power and heat supply device includes the biomass fuel drying system of the above-mentioned coupled thermoelectric power generation boiler. This power and heat supply device is coupled with the biomass fuel drying system, and the waste heat is used for drying the biomass fuel, which not only realizes the stepped utilization of the waste heat of the boiler 1, improves the energy utilization rate of the whole device, gives full play to the applicability of different quality energies, and enables the energy to be reasonably distributed and efficiently utilized in different links. Moreover, it can effectively dry the biomass fuel, improve the combustion performance of the biomass fuel, has a low operation cost of the device, and realizes the sustainable development of energy.

[0039] See Figure 2 , the present invention provides a drying method using the biomass fuel drying system of the above-mentioned coupled thermoelectric power generation boiler, including: S1: Crush the biomass fuel; after crushing the biomass fuel, it is necessary to test the moisture content of the biomass fuel; the purpose is to adjust the installation angle and rotation speed of the drying cylinder 32 according to the moisture content of the biomass fuel; for example, when drying 40 t / h of biomass raw materials with a moisture content of 50%, adopting the scheme of using the heat exchanger 2 to connect to the steam waste heat outlet of the boiler 1 and drying with extracted steam, the industrial steam consumption is 37.6 t / h, and the moisture content of the dried biomass fuel reaches the expected standard, meeting the subsequent production requirements.

[0040] S2: Convey the crushed biomass fuel into the drying cylinder 32 and drive the drying cylinder 32 to rotate; S3: Convey the waste heat of the flue gas or steam in the boiler 1 to the heat exchanger 2 for heat exchange, and convey the medium after heat exchange in the heat exchanger 2 into the heat exchange tubes 31 to exchange heat with the biomass fuel in the drying cylinder 32 to complete the drying of the biomass fuel.

[0041] By conveying the crushed biomass fuel into the rotating drying cylinder 32, this method utilizes the rotation of the drying cylinder 32 to continuously tumble and mix the fuel while exchanging heat with the medium in the heat exchange tubes 31 to evaporate moisture, achieving uniform and efficient drying of the biomass fuel. It fully utilizes the waste heat of the flue gas or steam generated by the thermal power boiler 1, improves the comprehensive utilization rate of energy, reduces energy consumption, has a simple method and low drying cost, and realizes the improvement of drying efficiency while enhancing the resource utilization rate.

[0042] The above are only the preferred embodiments of the present invention and are not used to limit the technical solutions of the present invention. Those skilled in the art should understand that without departing from the spirit and principle of the present invention, the technical solutions can be subject to several simple modifications and substitutions, and these modifications and substitutions also fall within the protection scope covered by the claims.

Claims

1. A biomass fuel drying system coupled with a thermal power generation boiler, characterized in that It includes a heat exchanger and a drying device connected in sequence to the waste heat outlet of the boiler steam or the waste heat outlet of the flue gas; the drying device includes heat exchange tubes, the hot ends of the heat exchange tubes are connected to the cold end of the heat exchanger; the cold end outlet of the heat exchange tubes is connected to the heat exchanger; a drying cylinder is sleeved outside the heat exchange tubes, and the drying cylinder is connected with a driving device for driving the drying cylinder to rotate outside the heat exchange tubes; a spiral baffle is axially arranged in the cavity between the drying cylinder and the heat exchange tubes; a biomass fuel input port and a biomass fuel output port are arranged on the drying cylinder, the biomass fuel input port is connected to a biomass fuel source, and the biomass fuel output port is connected to the fuel input end of the boiler.

2. The biomass fuel drying system for a coupled thermoelectric power generation boiler according to claim 1, wherein The heat exchanger is connected to the waste heat outlet of the boiler steam, and the steam pressure at the waste heat outlet of the boiler steam is 0.3 - 0.6 MPa, and the temperature is 240°C - 270°C.

3. The biomass fuel drying system for a coupled thermal power generation boiler according to claim 1, wherein A bearing is arranged between the heat exchange tubes and the drying cylinder.

4. The biomass fuel drying system for a coupled thermoelectric power generation boiler according to claim 1, wherein A raw material conveying device is arranged between the biomass fuel input port and the biomass fuel source for conveying the biomass fuel from the biomass fuel source into the drying cylinder.

5. The biomass fuel drying system for a coupled thermal power generation boiler according to claim 1, wherein A biomass fuel bin is arranged between the biomass fuel output port and the boiler.

6. The biomass fuel drying system for a coupled thermal power generation boiler according to claim 1, characterized in that, A biomass fuel output device is arranged at the biomass fuel output port for outputting the dried biomass fuel to the boiler for combustion.

7. The biomass fuel drying system for a coupled thermoelectric power generation boiler according to claim 1, wherein, A circulation pump is arranged at the cold end outlet of the heat exchange tubes for pumping the heat-exchanged medium to the heat exchanger for circulating heat exchange.

8. A power and heat supply device, characterized in that, It includes the biomass fuel drying system for a coupled thermal power generation boiler according to any one of claims 1 - 7.

9. A drying method for a biomass fuel drying system using the coupled thermal power generation boiler according to any one of claims 1-7, characterized in that, It includes: Crushing the biomass fuel; Conveying the crushed biomass fuel into the drying cylinder and driving the drying cylinder to rotate; Conveying the waste heat of the flue gas or steam inside the boiler to the heat exchanger for heat exchange, and conveying the heat-exchanged medium in the heat exchanger into the heat exchange tubes to exchange heat with the biomass fuel in the drying cylinder to complete the drying of the biomass fuel.

10. The biomass fuel drying method for a coupled thermoelectric power generation boiler according to claim 9, wherein After crushing the biomass fuel, it is necessary to test the moisture content of the biomass fuel; Adjust the installation angle and rotation speed of the drying cylinder according to the moisture content of the biomass fuel.

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