Drying system for biomass fuel and biomass fuel boiler

Abstract

The invention discloses a drying system for biomass fuel and a biomass fuel boiler, a containing space is defined by a first bin body, a second bin body is arranged on the outer side of the first bin body, a first heat storage space is defined by the second bin body and the first bin body, and a heat storage material is arranged in the first heat storage space; the medium pipeline and the solar heat collection device form a medium circulation loop, and part of the structure is located in the first heat storage space. The heat pump device can generate hot air, and the ventilation device is used for guiding the hot air generated by the heat pump device into the containing space. Therefore, heat energy collected by the solar heat collection device can be transmitted to the heat storage material so as to dry the biomass fuel, hot air generated by the heat pump device can be guided into the containing space through the ventilation device so as to dry the biomass fuel, the water content of the biomass fuel can be rapidly reduced, and the biomass fuel drying efficiency is improved. The heat value of the biomass fuel is increased, the combustion efficiency of the boiler is improved, and clean and efficient utilization of the biomass fuel is achieved.

Description

Technical Field

[0001] The invention relates to the field of biomass fuel, and in particular to a drying system for biomass fuel and a biomass fuel boiler. Background Art

[0002] In the relevant technology, 1 ton of biomass fuel is approximately equivalent to 0.736 tons of medium-quality coal. If biomass fuel is used to replace loose coal combustion, carbon emissions can be greatly reduced. However, due to its high water content, biomass fuel has a low calorific value. When burned, it will cause the flue gas temperature in the boiler to change and quickly consume the oxygen in the boiler, causing the boiler bed temperature to drop rapidly and the combustion conditions to deteriorate, thereby reducing the combustion efficiency of the boiler. In addition, it will also cause the environmental protection parameters of the boiler to be abnormal, aggravating environmental pollution. If the biomass fuel is simply spread out to dry, the efficiency is extremely poor. At present, there is an urgent need for a solution that can quickly dry biomass fuel. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a drying system for biomass fuel, which can quickly reduce the water content of biomass fuel, improve the calorific value of biomass fuel, and is conducive to the clean and efficient use of biomass fuel.

[0004] The present invention further proposes a biomass fuel boiler.

[0005] The drying system for biomass fuel according to the present invention comprises: a solar thermal collector; a drying bin and a heat storage material, wherein the drying bin comprises a first bin body and a second bin body, wherein the first bin body defines a receiving space for receiving the biomass fuel, and the second bin body is arranged outside the first bin body and defines a first heat storage space together with the first bin body, wherein the heat storage material is arranged in the first heat storage space; a medium pipeline, wherein a heat exchange medium is arranged in the medium pipeline, wherein the medium pipeline forms a medium circulation loop with the solar thermal collector and a part of the structure is located in the first heat storage space, so as to transfer the heat energy collected by the solar thermal collector to the heat storage material; a heat pump device and a ventilation device, wherein the heat pump device can generate hot air, and the ventilation device is used to introduce the hot air generated by the heat pump device into the receiving space.

[0006] According to the drying system for biomass fuel of the present invention, the heat energy collected by the solar thermal collector can be transferred to the heat storage material to dry the biomass fuel, and the hot air generated by the heat pump device can be introduced into the receiving space through the ventilation device to dry the biomass fuel. The water content of the biomass fuel can be quickly reduced, and the calorific value of the biomass fuel can be increased, which is beneficial to improving the combustion efficiency of the boiler and realizing the clean and efficient use of the biomass fuel.

[0007] In some examples of the present invention, the heat pump device includes: a compressor, a condenser, an expansion valve, and an evaporator, wherein the compressor, the condenser, the expansion valve, and the evaporator form a heat pump circulation loop;

[0008] The ventilation device includes: a first ventilation duct, the drying chamber has an air outlet connected to the receiving space, the first ventilation duct is connected to the air outlet, and the hot and humid air in the receiving space can be guided to the evaporator through the first ventilation duct to exchange heat with the evaporator.

[0009] In some examples of the present invention, one end of the first ventilation duct is in communication with the air outlet, and a portion of the structure of the first ventilation duct is in contact with the evaporator;

[0010] Alternatively, the drying system further includes: a first heat storage container, the first ventilation pipeline is connected between the air outlet and the first heat storage container, and the evaporator is disposed in the first heat storage container.

[0011] In some examples of the present invention, the ventilation device also includes: a second ventilation duct, the drying chamber has an air inlet connected to the receiving space, the second ventilation duct is connected to the air inlet, the hot air generated by the heat pump device is introduced into the receiving space through the second ventilation duct, and the air inlet is set at a height lower than the air outlet.

[0012] In some examples of the present invention, one end of the second ventilation duct is in communication with the air inlet, and a portion of the structure of the second ventilation duct is in contact with the condenser;

[0013] Alternatively, the drying system further includes: a second heat storage container, the second ventilation pipeline is connected between the air inlet and the second heat storage container, and the condenser is arranged in the second heat storage container.

[0014] In some examples of the present invention, the drying system for biomass fuel also includes: a loading and conveying device and a protective shed, the loading and conveying device is used to convey the biomass fuel to the receiving space, the protective shed cover is arranged on the loading and conveying device and the drying bin, and the solar energy collector is arranged on the protective shed.

[0015] In some examples of the present invention, the solar thermal collection device can provide electricity for the heat pump device.

[0016] In some examples of the present invention, the drying chamber further includes: a partition plate, the partition plate being arranged in the receiving space to divide the receiving space into a first space and a second space, the first space being located above the second space, the partition plate having an movable gate, and when the gate is opened, the first space is connected to the second space.

[0017] In some examples of the present invention, the partition plate defines a second heat storage space connected to the first heat storage space, the heat storage material is arranged in the second heat storage space, and a part of the structure of the medium pipeline is located in the second heat storage space.

[0018] In some examples of the present invention, the drying system for biomass fuel further includes: an agitator, wherein the agitator is used to agitate the biomass fuel in the receiving space.

[0019] The biomass fuel boiler according to the present invention comprises the above-mentioned drying system for biomass fuel.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 is a schematic diagram of a drying system according to an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of a furnace body according to an embodiment of the present invention.

[0024] Reference numerals:

[0025] Drying system 100;

[0026] Solar thermal collector 10;

[0027] Drying chamber 20; air outlet 21; air inlet 22; first chamber 23; second chamber 24; receiving space 25; first space 26; second space 27; first heat storage space 28; second heat storage space 29;

[0028] Heat pump device 30; compressor 31; condenser 32; expansion valve 33; evaporator 34; heat pump circulation loop 35;

[0029] Ventilation device 40; first ventilation pipeline 41; second ventilation pipeline 42;

[0030] Feeding conveyor 50; protective shed 51; partition plate 52; gate 53;

[0031] A first temperature sensor 61; a second temperature sensor 62; a first humidity sensor 63; a second humidity sensor 64;

[0032] The front-of-furnace material bin 71 ; the front-of-furnace material feeding device 72 ; the furnace body 73 ; the stirrer 74 . DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0034] Reference below Figure 1 and Figure 2 A drying system 100 for biomass fuel according to an embodiment of the present invention is described.

[0035] like Figure 1 and Figure 2 As shown, the drying system 100 according to the embodiment of the present invention includes: a solar heat collecting device 10, a drying chamber 20, a heat storage material, a medium pipeline, a heat pump device 30 and a ventilation device 40.

[0036] The drying bin 20 includes a first bin body 23 and a second bin body 24. The first bin body 23 defines a receiving space 25 for receiving biomass fuel. The second bin body 24 is arranged outside the first bin body 23 and defines a first heat storage space 28 together with the first bin body 23. Heat storage material is arranged in the first heat storage space 28; a heat exchange medium is arranged in the medium pipeline, and the medium pipeline forms a medium circulation loop with the solar thermal collection device 10 and part of the structure is located in the first heat storage space 28 to transfer the heat energy collected by the solar thermal collection device 10 to the heat storage material; the heat pump device 30 can generate hot air, and the ventilation device 40 is used to introduce the hot air generated by the heat pump device into the receiving space 25.

[0037] Among them, biomass fuel can be but is not limited to straw, sawdust, bagasse, rice bran, etc.

[0038] As some embodiments of the present application, the solar thermal collection device 10 includes a flat-plate collector, which is mainly composed of a transparent cover plate, a heat absorption plate and an insulation layer. The solar thermal collection device 10 can absorb solar energy and convert it into thermal energy.

[0039] The drying bin 20 includes a first bin body 23 and a second bin body 24. The first bin body 23 defines a receiving space 25, which can be used to receive biomass fuel. The second bin body 24 is arranged outside the first bin body 23, and the second bin body 24 and the first bin body 23 jointly define a first heat storage space 28. A heat storage material is arranged in the first heat storage space 28. The heat storage material can store heat and continuously release heat so that the temperature of the receiving space 25 is kept at a high state for a long time to dry the biomass fuel. The heat storage material can be but not limited to paraffin, fatty acid, polyethylene glycol, etc. As some embodiments of the present application, the heat storage material is paraffin.

[0040] As some embodiments of the present application, the drying bin 20 also includes: an insulation layer, which is arranged on the outside of the second bin body 24. The material of the insulation layer may be but is not limited to glass fiber, polyurethane foam, mineral wool, etc. Such a setting can insulate the receiving space 25 and the first heat storage space 28 to reduce the dissipation rate of heat in the receiving space 25, so that the temperature of the receiving space 25 is kept at a high state for a long time.

[0041] A heat exchange medium is arranged in the medium pipeline, and the heat exchange medium may be, but is not limited to, water, air, etc. The medium pipeline and the solar heat collector 10 form a medium circulation loop, and part of the structure of the medium pipeline is located in the first heat storage space 28, that is, the solar heat collector 10 can transfer the collected heat to the heat exchange medium in the medium pipeline (that is, the solar heat collector 10 can heat the heat exchange medium in the medium pipeline). Since part of the structure of the medium pipeline is located in the first heat storage space 28, the heated heat exchange medium can exchange heat with the heat storage material arranged in the first heat storage space 28 when it flows to the first heat storage space 28, so that the heat energy collected by the solar heat collector 10 can be transferred to the heat storage material, so as to radiate heat energy to the receiving space 25 through the heat storage material, so as to increase the temperature of the receiving space 25. As some embodiments of the present application, the drying system 100 also includes a first driving member, which can drive the heat exchange medium in the medium pipeline so that the heat exchange medium flows in the medium circulation loop to continuously transfer heat to the heat storage material. As some embodiments of the present application, the first driving member is a medium pump.

[0042] The heat pump device 30 can generate hot air, and the ventilation device 40 is used to introduce the hot air generated by the heat pump device 30 into the receiving space 25. As some embodiments of the present application, the ventilation device 40 also includes a first air guide member, which can be but is not limited to a blower, etc. The ventilation device 40 can introduce the hot air generated by the heat pump device 30 into the receiving space 25 through the first air guide member to dry the biomass fuel.

[0043] It should be noted that, by allowing the solar energy thermal collector 10 to transfer heat to the heat exchange medium in the medium pipeline, and by allowing part of the medium pipeline structure to be located in the first heat storage space 28, the heat exchange medium in the medium pipeline can exchange heat with the heat storage material arranged in the first heat storage space 28, which can increase the temperature of the first heat storage space 28, and then increase the temperature in the receiving space 25. Since the temperature rises, the moisture in the biomass fuel can evaporate, thereby reducing the moisture in the biomass fuel. In addition, by allowing the ventilation device 40 to introduce the dry hot air generated by the heat pump device 30 into the receiving space 25, the biomass fuel can be dried, the moisture content in the biomass fuel can be reduced, and the calorific value of the biomass fuel can be increased.

[0044] Thus, the heat energy collected by the solar thermal collector 10 can be transferred to the heat storage material to dry the biomass fuel, and the hot air generated by the heat pump device 30 can be introduced into the receiving space 25 through the ventilation device 40 to dry the biomass fuel, which can quickly reduce the water content of the biomass fuel and increase the calorific value of the biomass fuel, which is beneficial to improving the combustion efficiency of the boiler and realizing clean and efficient utilization of the biomass fuel.

[0045] In some embodiments of the present invention, Figure 1 As shown, the heat pump device 30 includes: a compressor 31, a condenser 32, an expansion valve 33, and an evaporator 34. The compressor 31, the condenser 32, the expansion valve 33, and the evaporator 34 form a heat pump circulation loop 35; the ventilation device 40 includes: a first ventilation pipeline 41, the drying chamber 20 has an air outlet 21 connected to the receiving space 25, the first ventilation pipeline 41 is connected to the air outlet 21, and the hot and humid air in the receiving space 25 can be guided to the evaporator 34 through the first ventilation pipeline 41 to exchange heat with the evaporator 34.

[0046] Among them, the heat pump device 30 also includes a refrigerant, which can flow in the heat pump circulation loop 35. The refrigerant can be but is not limited to R134a (1,1,1,2-tetrafluoroethane), R1234YF (2,3,3,3-tetrafluoropropylene), etc. By circulating the refrigerant in the evaporator 34, the compressor 31, the condenser 32 and the expansion valve 33, the heat generation of the heat pump device 30 can be achieved. Specifically, the refrigerant absorbs heat in the evaporator 34, and the refrigerant evaporates into a low-temperature and low-pressure gas. The gaseous refrigerant is compressed by the compressor 31, and the temperature and pressure increase to become a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant releases heat in the condenser 32 to generate hot air. At the same time, the refrigerant condenses into a high-pressure liquid and flows to the expansion valve 33.

[0047] The drying chamber 20 has an air outlet 21, which is connected to the receiving space 25. The first ventilation pipe 41 is connected to the air outlet 21. The hot and humid air in the receiving space 25 can be guided to the evaporator 34 through the first ventilation pipe 41 to exchange heat with the evaporator 34, so that the refrigerant in the evaporator 34 can absorb heat.

[0048] As some embodiments of the present application, the ventilation device 40 also includes a second air guide member, which can guide the hot and humid air in the receiving space 25 to the evaporator 34 through the first ventilation duct 41. As some embodiments of the present application, the second air guide member is a blower.

[0049] Such an arrangement can lead the hot and humid air in the receiving space 25 out of the receiving space 25 through the first ventilation duct 41, so as to dry the receiving space 25 and improve the drying effect of the biomass fuel. In addition, by introducing the hot and humid air in the receiving space 25 into the evaporator 34, the heat of the hot and humid air led out of the receiving space 25 can be absorbed by the heat pump device 30, which is beneficial to saving energy.

[0050] In some embodiments of the present invention, Figure 1 As shown, one end of the first ventilation duct 41 is connected to the air outlet 21, and a part of the structure of the first ventilation duct 41 is in contact with the evaporator 34; or, the drying system 100 further includes: a first heat storage container, the first ventilation duct 41 is connected between the air outlet 2 and the first heat storage container, and the evaporator 34 is arranged in the first heat storage container.

[0051] As some embodiments of the present application, one end of the first ventilation duct 41 is connected to the air outlet 21, and a partial structure of the first ventilation duct 41 is in contact with the evaporator 34 to guide the hot and humid air in the receiving space 25 to the evaporator 34, so that the hot and humid air in the receiving space 25 can exchange heat with the evaporator 34. For example, a partial structure of the first ventilation duct 41 is wrapped around the evaporator 34 and in contact with the evaporator 34. When the hot and humid air in the receiving space 25 flows through the portion of the first ventilation duct 41 in contact with the evaporator 34, it can exchange heat with the evaporator 34. Such a configuration can increase the heat exchange area, which is beneficial to improving the heat exchange efficiency.

[0052] As some embodiments of the present application, the drying system 100 further includes: a first heat storage container, a first ventilation pipeline 41 connected between the air outlet 21 and the first heat storage container, an evaporator 34 disposed in the first heat storage container, and the first ventilation pipeline 41 can introduce the hot and humid air in the receiving space 25 into the first heat storage container, and the hot and humid air in the first heat storage container can exchange heat with the evaporator 34. Such a configuration can place the evaporator 34 in the hot and humid air derived from the receiving space 25, which can increase the heat exchange area, which is conducive to improving the heat exchange efficiency, and can also enable the evaporator 34 to fully absorb the heat of the hot and humid air derived from the receiving space 25, which is conducive to saving energy.

[0053] In some embodiments of the present invention, Figure 1 As shown, the ventilation device 40 also includes: a second ventilation duct 42, the drying chamber 20 has an air inlet 22 connected to the receiving space 25, the second ventilation duct 42 is connected to the air inlet 22, the hot air generated by the heat pump device 30 is introduced into the receiving space 25 through the second ventilation duct 42, and the setting height of the air inlet 22 is lower than the air outlet 21.

[0054] Among them, the drying chamber 20 has an air inlet 22, the air inlet 22 is connected to the receiving space 25, and the second ventilation duct 42 is connected to the air inlet 22. The hot air generated by the heat pump device 30 can be introduced into the receiving space 25 through the second ventilation duct 42. As some embodiments of the present application, the ventilation device 40 also includes a first air guide, which can introduce the hot air generated by the heat pump device 30 into the receiving space 25 through the second ventilation duct 42. Specifically, the high-temperature and high-pressure gaseous refrigerant in the heat pump circulation loop 35 is condensed into a high-pressure liquid refrigerant in the condenser 32 and releases heat to convert the low-temperature dry air around the condenser 32 into high-temperature dry air. The first air guide can introduce the high-temperature dry air around the condenser 32 into the receiving space 25 through the second ventilation duct 42 to dry the biomass fuel, so as to quickly reduce the water content in the biomass fuel and improve the calorific value of the biomass fuel.

[0055] Furthermore, the setting height of the air inlet 22 is lower than the setting height of the air outlet 21. In some embodiments of the present application, the first air guide is a blower. Since hot air will flow upward, by setting the air inlet 22 at a lower height than the air outlet 21, the high-temperature dry air introduced into the receiving space 25 through the second ventilation duct 42 can gradually rise in the receiving space 25 to improve the drying effect.

[0056] In some embodiments of the present invention, Figure 1As shown, one end of the second ventilation duct 42 is connected to the air inlet 22, and a part of the structure of the second ventilation duct 42 is in contact with the condenser 32; or, the drying system 100 further includes: a second heat storage container, the second ventilation duct 42 is connected between the air inlet 22 and the second heat storage container, and the condenser 32 is arranged in the second heat storage container.

[0057] As some embodiments of the present application, one end of the second ventilation duct 42 is connected to the air inlet 22, and a portion of the structure of the second ventilation duct 42 is in contact with the condenser 32, so that the condenser 32 heats the dry air in the surrounding second ventilation duct 42 into high-temperature dry air, and introduces it into the receiving space 25 through the second ventilation duct 42, so that the receiving space 25 is dried to improve the drying effect of the biomass fuel. As some embodiments of the present application, a portion of the structure of the second ventilation duct 42 is wound around the condenser 32 and in contact with the condenser 32. Such a configuration can increase the heat exchange area, which is conducive to improving the heat exchange efficiency.

[0058] As some embodiments of the present application, the drying system 100 further includes: a second heat storage container, a second ventilation pipeline 42 is connected between the air inlet 22 and the second heat storage container, and a condenser 32 is provided in the second heat storage container. The condenser 32 can release heat to the second heat storage container first to heat the dry air in the second heat storage container, and the dry air in the second heat storage container can be introduced into the receiving space 25 through the second ventilation pipeline 42. This arrangement can place the condenser 32 in the second heat storage container, which can increase the heat exchange area to fully increase the gas temperature in the second heat storage container, so that the temperature of the dry air introduced into the receiving space 25 through the second ventilation pipeline 42 is higher, which is conducive to improving the drying effect and drying efficiency of the biomass fuel.

[0059] In some embodiments of the present invention, Figure 1 As shown, the drying system 100 for biomass fuel also includes: a loading and conveying device 50 and a protective shed 51, the loading and conveying device 50 is used to convey the biomass fuel to the receiving space 25, the protective shed 51 is covered by the loading and conveying device 50 and the drying bin 20, and the solar thermal collector 10 is arranged in the protective shed 51.

[0060] Among them, the loading conveyor device 50 can be but is not limited to a belt conveyor device, a roller conveyor device, etc. As some embodiments of the application, the loading conveyor device 50 is a belt conveyor device, and the loading conveyor device 50 is capable of conveying biomass fuel to the receiving space 25 to improve the loading efficiency.

[0061] The protective shed 51 covers the feeding conveyor 50 and the drying bin 20, that is, part of the structure of the protective shed 51 is arranged above the feeding conveyor 50 and can shield the feeding conveyor 50, and part of the structure of the protective shed 51 is arranged above the drying bin 20 and can shield the drying bin 20. In other words, the protective shed 51 can shield the feeding conveyor 50 and the drying bin 20 to protect the feeding conveyor 50 and the drying bin 20, so as to reduce the risk of rainwater wetting the biomass fuel on the feeding conveyor 50 and the biomass fuel in the drying bin 20. The solar thermal collector 10 is arranged in the protective shed 51, specifically, the solar thermal collector 10 is arranged on the roof of the protective shed 51 to receive the heat of the sun.

[0062] By arranging the protective shed 51 to cover the loading and conveying device 50 and the drying bin 20, the risk of rain wetting the biomass fuel on the loading and conveying device 50 and the biomass fuel in the drying bin 20 can be reduced. By arranging the solar thermal collecting device 10 on the protective shed 51, the surface space of the protective shed 51 can be reasonably utilized to provide an installation position for the solar thermal collecting device 10, which is beneficial to reducing the difficulty of arranging the solar thermal collecting device 10 and improving the space utilization rate of the drying system 100. Moreover, the protective shed 51 is large in size and can be arranged with a large number of solar thermal collecting devices 10, thereby increasing the heat collection area and improving the heat collection efficiency of the solar thermal collecting device 10.

[0063] In some embodiments of the present invention, Figure 1 As shown, the solar thermal collection device 10 can provide electricity for the heat pump device 30 .

[0064] As some embodiments of the present application, the solar thermal collection device 10 can convert thermal energy into electrical energy and directly provide electricity for the heat pump device 30 .

[0065] As some embodiments of the present application, the drying system 100 also includes an energy storage device. The solar thermal collection device 10 can convert thermal energy into electrical energy and store it in the energy storage device, and provide electricity to the heat pump device 30 through the energy storage device. This configuration enables the drying system 100 to continue to operate the heat pump device 30 through the energy storage device when there is no sun at night, and continue to dry the receiving space 25 without the need for additional electrical energy.

[0066] Of course, the solar thermal collection device 10 can store part of the electrical energy in the energy storage device while providing electricity to the heat pump device 30 .

[0067] By enabling the solar thermal collection device 10 to provide electricity to the heat pump device 30 , it is beneficial to save energy.

[0068] In some embodiments of the present invention, Figure 1As shown, the drying chamber 20 also includes: a partition plate 52, which is arranged in the receiving space 25 to divide the receiving space 25 into a first space 26 and a second space 27, the first space 26 is located above the second space 27, and the partition plate 52 has an movable gate 53. When the gate 53 is opened, the first space 26 is connected to the second space 27.

[0069] The partition plate 52 is disposed in the receiving space 25 , and can divide the receiving space 25 into a first space 26 and a second space 27 . The first space 26 is located above the second space 27 , and the air inlet 22 and the air outlet 21 are both connected to the first space 26 .

[0070] As some embodiments of the present application, the drying system 100 also includes: a controller, the gate 53 is electrically connected to the controller, the controller can control the gate 53 to open or close, when the gate 53 is opened, the biomass fuel in the first space 26 can enter the second space 27, and the biomass fuel entering the second space 27 is the biomass fuel that has been dried.

[0071] As some embodiments of the present application, the drying system 100 also includes: a first temperature sensor 61, a second temperature sensor 62, a first humidity sensor 63, and a second humidity sensor 64. The first temperature sensor 61 and the first humidity sensor 63 are both arranged in the first space 26 and are respectively used to detect the temperature information and humidity information of the first space 26. The second temperature sensor 62 and the second humidity sensor 64 are both arranged in the second space 27 and are respectively used to detect the temperature information and humidity information of the second space 27. The controller is electrically connected to the first temperature sensor 61, the second temperature sensor 62, the first humidity sensor 63, and the second humidity sensor 64. The first temperature sensor 61 and the first humidity sensor 63 can feed back the detected temperature information and humidity information to the controller, and the controller can control the gate 53 to open or close according to the temperature information and humidity information of the first space 26. For example, if the fed-back temperature information and humidity information meet the target requirements, the controller can control the gate 53 to open so that the first space 26 is connected with the second space 27, so that the biomass fuel that has been dried in the first space 26 can enter the second space 27. If the fed-back temperature information and humidity information do not meet the target requirements, the controller can control the gate 53 to remain closed so that the biomass fuel continues to be dried in the first space 26.

[0072] The second temperature sensor 62 and the second humidity sensor 64 can feed back the detected temperature information and humidity information of the second space 27 to the controller, and the controller can determine whether the operation of the drying system 100 is abnormal based on the data fed back by the second temperature sensor 62 and the second humidity sensor 64 .

[0073] As some embodiments of the present application, the controller can control the medium flow rate in the medium circulation loop based on the detection information of the first temperature sensor 61. For example, if the detection information of the first temperature sensor 61 is greater than the preset temperature value, the medium flow rate in the medium circulation loop can be reduced. If the detection information of the first temperature sensor 61 is less than the preset temperature value, the medium flow rate in the medium circulation loop can be increased.

[0074] As some embodiments of the present application, the controller can control the power of the heat pump device 30 based on the detection information of the first humidity sensor 63. For example, if the detection information of the first humidity sensor 63 is greater than the preset humidity value, the power of the heat pump device 30 can be increased. If the detection information of the first humidity sensor 63 is less than the preset humidity value, the power of the heat pump device 30 can be reduced.

[0075] As some embodiments of the present application, Figure 1 and Figure 2 As shown, the drying system 100 also includes: a furnace front silo 71 and a furnace front feeding device 72. After being dried in the drying bin 20, the biomass fuel enters the furnace body 73 through the furnace front silo 71 and the furnace front feeding device 72 for combustion, which is beneficial to improving the combustion efficiency and realizing the clean and efficient use of the biomass fuel. The furnace body 73 is a part of the boiler. Improving the combustion efficiency of the furnace body 73 is to improve the combustion efficiency of the boiler.

[0076] By providing the partition plate 52 with an movable gate 53 and communicating the first space 26 with the second space 27 when the gate 53 is opened, the drying bin 20 can be layered and the biomass fuel can be dried in batches multiple times, which is beneficial to improving the drying efficiency. In addition, the second space 27 can store the dried biomass fuel, which is beneficial to reducing storage pressure and management costs.

[0077] In some embodiments of the present invention, Figure 1 As shown, the partition plate 52 defines a second heat storage space 29 that is connected to the first heat storage space 28 , a heat storage material is disposed in the second heat storage space 29 , and a portion of the structure of the medium pipeline is located in the second heat storage space 29 .

[0078] The partition plate 52 defines a second heat storage space 29 , and the first heat storage space 28 is connected to the second heat storage space 29 . Heat storage material is arranged in the second heat storage space 29 , and part of the structure of the medium pipeline is located in the second heat storage space 29 .

[0079] It should be noted that, by enabling the solar thermal collector 10 to transfer heat to the medium pipeline and arranging part of the structure of the medium pipeline in the second heat storage space 29, the heat exchange medium in the medium pipeline can be heat-exchanged with the heat storage material in the second heat storage space 29, so that the heat collected by the solar thermal collector 10 can be transferred to the heat storage material in the second heat storage space 29, and the heat storage material can store heat and continuously release heat.

[0080] As some embodiments of the present application, the medium pipeline has a spiral tubular structure, which can increase the heat exchange area and help improve the heat exchange efficiency.

[0081] Such an arrangement allows the top wall of the second space 27 (i.e., the bottom wall of the first space 26, i.e., the partition plate 52) to also dissipate heat, which is beneficial to further improve the drying efficiency of the biomass fuel. In addition, the top wall, bottom wall, and surrounding side walls of the second space 27 can all dissipate heat, which can reduce the risk of moisture resorption of the biomass fuel in the second space 27.

[0082] In some embodiments of the present invention, Figure 1 As shown, the drying system 100 for biomass fuel further includes: a stirrer 74 , and the stirrer 74 is used to stir the biomass fuel in the receiving space 25 .

[0083] In which, at least part of the agitator 74 is arranged in the receiving space 25, that is, part of the agitator 74 is arranged in the receiving space 25, or the whole of the agitator 74 is arranged in the receiving space 25. As some embodiments of the present application, the drying system 100 also includes a second driving member, which can drive the agitator 74 so that the agitator 74 stirs the biomass fuel in the receiving space 25. This arrangement can improve the drying effect and reduce the risk of the biomass fuel accumulated in the middle not being fully dried.

[0084] As some embodiments of the present application, the second driving member may be configured as a motor. As some embodiments of the present application, the stirrer 74 is at least partially disposed in the first space 26 to stir the biomass fuel in the first space 26 .

[0085] By using the stirrer 74 to stir the biomass fuel in the receiving space 25 , the biomass fuel can be fully heated, reducing the probability of uneven heating of the biomass fuel, which is beneficial to improving the drying effect and use reliability of the drying system 100 .

[0086] The biomass fuel boiler according to the embodiment of the present invention comprises the drying system 100 for biomass fuel according to the above embodiment, such as Figure 2As shown, the biomass fuel boiler also includes a furnace body 73. After the biomass fuel is dried in the drying bin 20, it can enter the furnace body 73 through the front furnace silo 71 and the front furnace feeding device 72 for combustion. The biomass fuel boiler can be constructed as a biomass fuel circulating fluidized bed boiler.

[0087] Through the drying system 100 for biomass fuel of the present application, the heat energy collected by the solar thermal collector 10 can be transferred to the heat storage material to dry the biomass fuel, and the hot air generated by the heat pump device 30 can be introduced into the receiving space 25 through the ventilation device 40 to dry the biomass fuel. The water content of the biomass fuel can be quickly reduced, the calorific value of the biomass fuel can be increased, which is beneficial to improving the combustion efficiency of the boiler and realizing clean and efficient utilization of the biomass fuel.

[0088] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0089] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0090] In the description of the present invention, "plurality" means two or more.

[0091] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0092] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A drying system for biomass fuel, characterized in that: include: Solar thermal collectors; A drying bin and a heat storage material, wherein the drying bin comprises a first bin body and a second bin body, wherein the first bin body defines a storage space for accommodating the biomass fuel, and the second bin body is arranged outside the first bin body and defines a first heat storage space together with the first bin body, wherein the heat storage material is arranged in the first heat storage space; A medium pipeline, wherein a heat exchange medium is arranged in the medium pipeline, the medium pipeline and the solar thermal collector form a medium circulation loop and a part of the structure is located in the first heat storage space, so as to transfer the heat energy collected by the solar thermal collector to the heat storage material; A heat pump device and a ventilation device, wherein the heat pump device can generate hot air, and the ventilation device is used to introduce the hot air generated by the heat pump device into the accommodation space.

2. The drying system for biomass fuel according to claim 1, characterized in that: The heat pump device comprises: a compressor, a condenser, an expansion valve, and an evaporator, wherein the compressor, the condenser, the expansion valve, and the evaporator form a heat pump circulation loop; The ventilation device includes: a first ventilation duct, the drying chamber has an air outlet connected to the receiving space, the first ventilation duct is connected to the air outlet, and the hot and humid air in the receiving space can be guided to the evaporator through the first ventilation duct to exchange heat with the evaporator.

3. The drying system for biomass fuel according to claim 2, characterized in that: One end of the first ventilation pipeline is in communication with the air outlet, and a part of the structure of the first ventilation pipeline is in contact with the evaporator; Alternatively, the drying system further includes: a first heat storage container, the first ventilation pipeline is connected between the air outlet and the first heat storage container, and the evaporator is disposed in the first heat storage container.

4. The drying system for biomass fuel according to claim 2, characterized in that: The ventilation device also includes: a second ventilation duct, the drying chamber has an air inlet connected to the receiving space, the second ventilation duct is connected to the air inlet, the hot air generated by the heat pump device is introduced into the receiving space through the second ventilation duct, and the air inlet is set at a height lower than the air outlet.

5. The drying system for biomass fuel according to claim 4, characterized in that: One end of the second ventilation pipeline is in communication with the air inlet, and a portion of the structure of the second ventilation pipeline is in contact with the condenser; Alternatively, the drying system further includes: a second heat storage container, the second ventilation pipeline is connected between the air inlet and the second heat storage container, and the condenser is disposed in the second heat storage container.

6. The drying system for biomass fuel according to claim 1, characterized in that: Also includes: A feeding conveying device and a protective shed, wherein the feeding conveying device is used to convey the biomass fuel to the receiving space, the protective shed cover is arranged on the feeding conveying device and the drying bin, and the solar energy heat collecting device is arranged on the protective shed.

7. The drying system for biomass fuel according to claim 1, characterized in that: The solar thermal collection device can provide electricity for the heat pump device.

8. The drying system for biomass fuel according to claim 1, characterized in that: The drying chamber further includes: a partition plate, which is arranged in the receiving space to divide the receiving space into a first space and a second space, the first space is located above the second space, and the partition plate has an movable gate, when the gate is opened, the first space is connected to the second space.

9. The drying system for biomass fuel according to claim 8, characterized in that: The partition plate defines a second heat storage space communicated with the first heat storage space, the heat storage material is arranged in the second heat storage space, and a part of the structure of the medium pipeline is located in the second heat storage space.

10. The drying system for biomass fuel according to claim 1, characterized in that: Also includes: A stirrer is used to stir the biomass fuel in the receiving space.

11. A biomass fuel boiler, characterized in that: The invention comprises a drying system for biomass fuel according to any one of claims 1 to 10.

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