Biomass boiler fuel drying system
The design of the biomass boiler fuel drying system has solved the problems of unused waste heat and pollutant emissions, achieving efficient drying of biomass fuel and environmentally friendly emissions, while effectively utilizing waste heat.
Patent Information
- Application Number
- CN202520153299.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-22
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-01-22
AI Technical Summary
In existing biomass fuel drying technologies, waste heat is not effectively utilized, and the emitted gases contain particulate matter and dust, causing serious pollution.
A biomass boiler fuel drying system was designed, including a primary drying device, a dust treatment system, a dehumidification device, and a secondary drying device. The system uses components such as a cyclone separator, a bag filter, an exhaust device, a heating device, and a condensation device to remove dust, dehumidify, and reheat the flue gas, thereby achieving waste heat recovery and utilization.
It achieves efficient drying of biomass fuel and reduction of pollutants, effectively utilizes waste heat, produces clean emissions, and has significant environmental benefits.
Smart Images
Figure CN223783298U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of biomass fuel drying, especially to a biomass boiler fuel drying system. BACKGROUND
[0002] Biomass fuel mainly includes various straw, wood and forestry waste etc. Fresh biomass has high water content, and high water content of fuel will cause great harm to the storage of biomass, boiler feeding system and combustion system etc. Therefore, it is necessary to dry the biomass. Drying is a high energy consumption industry, and how to dry the biomass economically and energy-saving is an important topic of biomass energy utilization.
[0003] In the prior art, a direct contact type drying device is usually used to dry the biomass fuel, but the waste heat after drying is directly discharged into the air, the discharged heat is not effectively utilized, and emissions, including particulate matter, dust, etc. may be produced in the discharged gas. Therefore, the utility model is proposed. UTILITY MODEL CONTENT
[0004] The utility model aims at providing a biomass boiler fuel drying system, which can recycle and utilize the waste heat after drying the biomass fuel, and can also reduce the emission of pollutants.
[0005] The utility model provides a biomass boiler fuel drying system, which comprises a primary drying device, a flue gas outlet of the primary drying device is connected with a dust treatment system through a pipeline, a gas outlet of the dust treatment system is connected with a dehumidifying device through a pipeline, a gas outlet of the dehumidifying device is connected with a secondary drying device through a pipeline, and the gas outlet of the secondary drying device is connected with a filtering device.
[0006] Further, the primary drying device comprises an inner cylinder and an outer cylinder, a drying cavity is formed between the inner cylinder and the outer cylinder, a flue gas inlet of the drying cavity is connected with a high-temperature flue gas pipeline, and a flue gas outlet of the drying cavity is connected with the dust treatment system through a pipeline.
[0007] Further, the dust treatment system comprises a cyclone separator and a dust collector, a flue gas inlet of the cyclone separator is connected with the flue gas outlet of the primary drying device through a pipeline, and a flue gas outlet of the cyclone separator is connected with a gas inlet of the dust collector through a pipeline.
[0008] Further, a dust collecting box is arranged at the dust outlet of the cyclone separator.
[0009] Further, the dust collector adopts a bag dust collector.
[0010] Further, the dehumidifying device comprises a box body, an air suction device, a heating device and a condensing device are arranged inside the box body, an air inlet of the air suction device is connected with a gas outlet of the dust collector through a pipeline, an air outlet of the air suction device is connected with a heating pipeline, the heating pipeline is connected with the condensing device, and the heating pipeline is provided with the heating device.
[0011] Further, a gas outlet of the dehumidifying device is connected with a reheating device through a pipeline, and a gas outlet of the reheating device is connected with the secondary drying device through a pipeline.
[0012] Further, a dust detector is arranged at the gas outlet of the dust collector, a control valve is arranged on the pipeline connecting the dust collector and the dehumidifying device, the gas outlet of the dust collector is further connected with an induced draft fan through a pipeline, and an outlet of the induced draft fan is connected with a flue gas inlet of the cyclone separator through a pipeline.
[0013] Further, a temperature and humidity sensor is arranged at the gas outlet of the dehumidifying device.
[0014] Further, a desulfurization and denitrification system is arranged between the primary drying device and the dust treatment system, a flue gas inlet of the desulfurization and denitrification system is connected with a flue gas outlet of the primary drying device through a pipeline, and a flue gas outlet of the desulfurization and denitrification system is connected with the dust treatment system through a pipeline.
[0015] Compared with the prior art, the utility model has the following advantages:
[0016] The technical scheme provided by the utility model comprises a primary drying device and a secondary drying device, the waste flue gas after drying of the primary drying device is subjected to dust removal by a dust treatment system and then enters a dehumidifying device to obtain dry clean gas, the clean gas enters the secondary drying device to dry the biomass fuel, and finally, the high-temperature flue gas waste heat discharged by the primary drying device is recycled and utilized, and pollution is reduced. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the specific embodiment of the utility model or the prior art, the drawings needed to be used in the specific embodiment or the prior art description will be briefly introduced as follows, and obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.
[0018] Figure 1 It is a structural schematic view of the drying system in the embodiment 1 of the utility model.
[0019] Figure 2 It is a structure schematic view of the dehumidifying device in the embodiment 1 of the utility model;
[0020] Figure 3 It is a structure schematic view of the drying system in the embodiment 2 of the utility model.
[0021] Mark explanation: 1 - primary drying device;2 - cyclone separator;3 - dust collector;4 - dehumidifying device;401 - box;402 - exhaust device;403 - heating device;404 - condensing device;405 - dry gas pipeline;406 - three-way control valve;407 - branch pipe;5 - reheating device;6 - secondary drying device;7 - filtering device;8 - desulfurization equipment;9 - denitration equipment;10 - dust detector;11 - induced draft fan. DETAILED DESCRIPTION
[0022] The technical scheme of the utility model will be described below in conjunction with the embodiments, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of protection of the utility model.
[0023] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, structure and operation, therefore, it cannot be understood as a limitation on the utility model.
[0024] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited. In addition, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0025] Example 1
[0026] A biomass boiler fuel drying system, such as Figure 1 As shown, the system includes a primary drying unit 1. The flue gas outlet of the primary drying unit 1 is connected to a dust treatment system via a pipeline. The gas outlet of the dust treatment system is connected to a dehumidification unit 4 via a pipeline. The gas outlet of the dehumidification unit 4 is connected to a secondary drying unit 6 via a pipeline. The gas outlet of the secondary drying unit 6 is connected to a filter unit 7. Both the primary drying unit 1 and the secondary drying unit 6 are devices for drying biomass fuel.
[0027] In this embodiment, both the primary drying device 1 and the secondary drying device 6 are conventional biomass fuel drying devices in the art, each including an inner cylinder and an outer cylinder, with a drying chamber formed between the inner and outer cylinders. The flue gas inlet of the drying chamber of the primary drying device 1 is connected to a high-temperature flue gas duct, utilizing high-temperature boiler flue gas to dry the biomass fuel. The flue gas outlet of the drying chamber is connected to a dust treatment system via a duct.
[0028] The dust treatment system includes a cyclone separator 2 and a dust collector 3. The flue gas inlet of the cyclone separator 2 is connected to the flue gas outlet of the drying chamber of the primary drying unit 1 via a pipeline, and the flue gas outlet of the cyclone separator 2 is connected to the gas inlet of the dust collector 3 via a pipeline. A dust collection box is installed at the dust outlet of the cyclone separator 2 for easy collection of treated dust. The dust collector 3 is a bag filter. The cyclone separator 2 uses centrifugal force to separate most of the large dust particles from the dried and cooled flue gas. After the dust-laden gas enters the cyclone separator 2, the centrifugal force generated by the high-speed rotation throws the heavier dust particles against the wall of the separator, and they fall into the dust collection box through the dust outlet, performing preliminary dust removal on the waste flue gas. The gas then enters the bag filter for further removal of fine dust particles, ensuring cleaner exhaust gas.
[0029] like Figure 2As shown, the dehumidifying device 4 comprises a box body 401, inside which are arranged an air suction device 402, a heating device 403 and a condensing device 404, and the side wall of the box body 401 is provided with a wet gas inlet and a dry gas outlet. The air suction device 402 is an air suction fan, the air inlet of the air suction fan is communicated with the wet gas inlet, the air outlet of the air suction fan is connected with a heating pipeline, the heating device 403 is arranged on the heating pipeline, and the heating device 403 can be arranged inside the heating pipeline. In this embodiment, the heating device 403 can be an electric heater. The outlet of the heating pipeline is connected with the condensing device 404, and the condensing device 404 can be a condenser in a conventional dehumidifier in the prior art. The outlet of the condensing device 404 is connected with the dry gas outlet. The wet gas treated by the dust treatment system is introduced into the dehumidifying device 4 through the air suction device 402, heated by the heating device 403, and then separated into water and steam by the condensing device 404 to obtain dry gas.
[0030] The dry gas pipeline 405 is arranged at the dry gas outlet of the box body 401, and the dry gas pipeline 405 is further connected with the wet gas inlet through a branch pipe 407. A three-way control valve 406 is arranged on the dry gas pipeline 405, the branch pipe 407 is connected with the three-way control valve 406, and a temperature and humidity sensor is arranged in the dry gas pipeline 405 to detect the temperature and humidity of the dry gas after dehumidification. When the humidity of the gas detected by the temperature and humidity sensor does not meet the use requirement, the gas is introduced into the box body 401 through the wet gas inlet again to be dehumidified through the branch pipe 407 until the requirement is met, and then the three-way control valve 406 is opened to enter the next operation.
[0031] The flue gas inlet of the drying cavity of the secondary drying device 6 is connected with the dry gas pipeline 405 of the dehumidifying device 4, the dry gas after dehumidification is directly introduced into the drying cavity of the secondary drying device 6, a reheating device 5 is arranged on the dry gas pipeline 405 after the three-way control valve 406, the temperature of the dry gas is detected by the temperature and humidity sensor, when the temperature of the dry gas is low, the reheating device 5 is opened to heat the gas, and then the gas is introduced into the secondary drying device 6 to dry the biomass fuel, when the temperature of the dry gas is still high, the reheating device 5 is not opened, and the dry gas is directly introduced into the secondary drying device 6.
[0032] A filtering device 7 is arranged at the gas outlet of the secondary drying device 6, and the filtering device 7 can be a conventional gas filter in the field. The secondary drying device 6 directly uses the clean gas after dust removal and dehumidification for drying, and the dried gas can be discharged after simple filtration.
[0033] The working process of the biomass boiler fuel drying system provided by the embodiment is as follows: when used, the biomass fuel to be dried is respectively added into the first drying device 1 and the second drying device 6, the high-temperature flue gas is introduced into the first drying device 1, the high-temperature flue gas is used to dry the biomass fuel, the flue gas with reduced temperature after drying is introduced into the cyclone separator 2 and the dust collector 3 for dust removal treatment, clean gas is obtained, the clean gas is introduced into the dehumidifying device 4 for dehumidification to obtain dry clean gas, the temperature and humidity sensor inside the dry gas pipeline 405 is used for detection, when the humidity does not meet the requirement, the dry clean gas is returned to the dehumidifying device 4 for re-dehumidification, when the temperature does not meet the requirement, the reheating device 5 is started to heat, when the temperature and humidity both meet the requirement, the dry clean gas is directly introduced into the second drying device 6 for drying, and the gas after drying is directly discharged after being filtered by the filtering device 7.
[0034] Embodiment 2
[0035] A biomass boiler fuel drying system, the technical solution in the embodiment is basically the same as that in embodiment 1, as shown in Figure 3 the differences are as follows: (1) the pipeline, in which the dust collector 3 and the dehumidifying device 4 are connected, is provided with a dust detector 10 and a control valve in the embodiment, the gas outlet of the dust collector 3 is connected through a pipeline and a draft fan 11, and the outlet of the draft fan 11 is connected through a pipeline and the flue gas inlet of the cyclone separator 2; (2) the filtering device 7 has a different structure; and (3) a desulfurization and denitrification system is further arranged in the embodiment.
[0036] The dust detector 10 is arranged to detect the dust concentration of the treated gas, when the dust concentration of the treated gas is low, the treated gas can be directly introduced into the dehumidifying device 4, and when the dust concentration of the treated gas is high, the control valve is closed, so that the treated gas is introduced into the cyclone separator 2 through the draft fan 11 again for dust removal treatment until the treated gas meets the requirement.
[0037] The filtering device 7 in the embodiment includes a shell, the opposite two side walls of the shell are respectively provided with a gas inlet and a gas outlet, the gas inlet is connected with the gas outlet of the second drying device 6, and the shell is internally provided with a primary filter and a high-efficiency filter. The treated gas after being treated by the primary filter and the high-efficiency filter is more clean and more environmentally friendly.
[0038] The flue gas inlet of the desulfurization and denitrification system is connected with the flue gas outlet of the first drying device 1 through a pipeline, the flue gas outlet of the desulfurization and denitrification system is connected with the flue gas inlet of the cyclone separator 2 through a pipeline, and the pipelines are respectively provided with valves, and the pipeline connected between the first drying device 1 and the cyclone separator 2 is also provided with a valve. The desulfurization and denitrification system can be used for desulfurization and denitrification treatment of high-temperature flue gas. The first drying device 1 can use high-temperature flue gas discharged by various devices, and some of the high-temperature flue gas contains not only particulate matters and dust, but also sulfur dioxide and nitrogen oxides, and the desulfurization and denitrification system can be used for treating the sulfur dioxide and nitrogen oxides contained in the flue gas.
[0039] A flue gas detector is installed at the flue gas outlet of the first drying device 1 to detect the sulfur dioxide and nitrogen oxides in the flue gas discharged by the first drying device 1, when the concentration of the sulfur dioxide and nitrogen oxides is high, the discharged flue gas is made to enter the desulfurization and denitrification system for desulfurization and denitrification treatment and then enter the cyclone separator 2 by controlling the valves, and when the concentration of the sulfur dioxide and nitrogen oxides is low, the flue gas is directly sent to the cyclone separator 2 by controlling the valves.
[0040] The desulfurization and denitrification system in the embodiment comprises a desulfurization device 8 and a denitrification device 9, the desulfurization device 8 is an activated carbon adsorption tower, the denitrification device 9 is an SCR denitrification reactor, the activated carbon adsorption tower is filled with activated carbon, the side wall of the activated carbon adsorption tower is provided with a flue gas inlet and a flue gas outlet, the flue gas inlet is connected with the flue gas outlet of the first drying device 1 through a pipeline, and the flue gas outlet is connected with the flue gas inlet of the SCR denitrification reactor, the SCR denitrification reactor is a reactor based on ammonia catalytic reduction method, the SCR denitrification reactor is provided with a flue gas inlet and a flue gas outlet, and is also provided with an ammonia gas inlet, the flue gas outlet is connected with the flue gas inlet of the cyclone separator 2 through a pipeline, the ammonia gas and the flue gas from the activated carbon adsorption tower are subjected to a denitrification reaction in the SCR denitrification reactor, the nitrogen oxides in the flue gas are removed, and then the flue gas enters the cyclone separator 2.
[0041] The biomass boiler fuel drying system provided by the utility model has the advantages that the dust treatment system and the dehumidifying device are arranged, the flue gas discharged by the first drying device is subjected to dust removal and dehumidification treatment, the dry and clean gas is obtained, the biomass fuel is subjected to drying in the second drying device, the flue gas after drying can be directly discharged after simple filtration, the heat of the waste flue gas discharged by the first drying device is recycled, the discharged gas does not contain dust and particulate matters, and the utility model is more environmentally friendly.
[0042] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A biomass boiler fuel drying system, characterized by, The first drying device (1) is connected with a dust treatment system through a pipeline at a flue gas outlet, a gas outlet of the dust treatment system is connected with a dehumidifying device (4) through a pipeline, a gas outlet of the dehumidifying device (4) is connected with a second drying device (6) through a pipeline, and the gas outlet of the second drying device (6) is connected with a filtering device (7).
2. The biomass boiler fuel drying system according to claim 1, wherein, The first drying device (1) comprises an inner cylinder and an outer cylinder, a drying cavity is formed between the inner cylinder and the outer cylinder, a flue gas inlet of the drying cavity is connected with a high-temperature flue gas pipeline, and a flue gas outlet of the drying cavity is connected with the dust treatment system through a pipeline.
3. The biomass boiler fuel drying system according to claim 2, wherein, The dust treatment system comprises a cyclone separator (2) and a dust collector (3), a flue gas inlet of the cyclone separator (2) is connected with the flue gas outlet of the first drying device (1) through a pipeline, and a flue gas outlet of the cyclone separator (2) is connected with a gas inlet of the dust collector (3) through a pipeline.
4. The biomass boiler fuel drying system according to claim 3, wherein, A dust collecting box is arranged at a dust outlet of the cyclone separator (2).
5. The biomass boiler fuel drying system according to claim 3, wherein, The dust collector (3) is a bag dust collector.
6. The biomass boiler fuel drying system according to claim 3, wherein, The dehumidifying device (4) comprises a box body (401), an air suction device (402), a heating device (403) and a condensing device (404) are arranged in the box body (401), an air inlet of the air suction device (402) is connected with the gas outlet of the dust collector (3) through a pipeline, an air outlet of the air suction device (402) is connected with a heating pipeline, the heating pipeline is connected with the condensing device (404), and the heating device (403) is arranged on the heating pipeline.
7. The biomass boiler fuel drying system according to claim 6, wherein, A gas outlet of the dehumidifying device (4) is connected with a reheating device (5) through a pipeline, and a gas outlet of the reheating device (5) is connected with the second drying device (6) through a pipeline.
8. The biomass boiler fuel drying system according to claim 6, wherein, A dust detector (10) is arranged at the gas outlet of the dust collector (3), a control valve is arranged on a pipeline connecting the dust collector (3) with the dehumidifying device (4), the gas outlet of the dust collector (3) is further connected with an induced draft fan (11) through a pipeline, and an outlet of the induced draft fan (11) is connected with the flue gas inlet of the cyclone separator (2) through a pipeline.
9. The biomass boiler fuel drying system according to claim 7, wherein, A temperature and humidity sensor is arranged at the gas outlet of the dehumidifying device (4).
10. The biomass boiler fuel drying system according to claim 1, wherein, A desulfurization and denitrification system is arranged between the first drying device (1) and the dust treatment system, a flue gas inlet of the desulfurization and denitrification system is connected with the flue gas outlet of the first drying device (1) through a pipeline, and a flue gas outlet of the desulfurization and denitrification system is connected with the dust treatment system through a pipeline.