Coal-fired boiler coupling incineration disposal biomass leftover material system
By designing a coal-fired boiler coupled incineration and disposal of biomass scrap materials, the problem of traditional coal-fired power plants being difficult to effectively utilize biomass scrap materials is solved, and the adequacy of biomass utilization and the safety of boiler operation is achieved.
Patent Information
- Application Number
- CN202421467753.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-25
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-06-25
AI Technical Summary
Traditional coal-fired power plants find it difficult to effectively utilize biomass scraps, resulting in high cost and low utilization rate of biomass fuel. At the same time, the large particle size of biomass fuel will cause blockage of fuel sampling and sample preparation systems and blockage of coal transportation systems, threatening the safe and stable operation of the unit.
A coal-fired boiler coupled incineration and disposal of biomass scrap materials is designed, including a receiving bin, an intermediate storage bin, a conveyor and an air supply mechanism. The materials are crushed by a shredder, and the conveyor conveys the materials to the intermediate storage bin, and the safe and effective incineration of biomass scrap materials is achieved through a special blanking channel and an air supply mechanism.
The adequacy of biomass utilization is achieved, the cost of power generation is reduced, the safety of boiler operation is ensured, and the impact of biomass fuel on the boiler coal transportation system is avoided.
Smart Images
Figure CN222824393U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of coal-fired boilers, in particular to a system for coupling coal-fired boilers with incineration and disposal of biomass scraps. Background Art
[0002] Biomass (reeds, wood) is widely used in papermaking or in special boilers for power generation, but the utilization rate of biomass scraps (reed bulk, bark, sawdust, etc.) is low, and the application of biomass in traditional large-scale coal-fired power plants is immature. Biomass fuel is expensive and not economical for blending; if the particle size of biomass fuel particles is too large, it will also cause blockage in the fuel sampling and sample preparation system and the coal transportation system, threatening the safe and stable operation of the unit. Utility Model Content
[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model proposes a coal-fired boiler coupled incineration and disposal of biomass scraps system, which has the advantages of full biomass utilization and good equipment safety.
[0004] According to the coal-fired boiler coupled incineration and disposal system of biomass scraps in the embodiment of the utility model, the coal-fired boiler coupled incineration and disposal system of biomass scraps includes a receiving bin, an intermediate storage bin, a conveyor and an air supply mechanism, the bottom of the receiving bin is connected to the shredder, the bottom of the intermediate storage bin is connected to the first end of the material dropping channel, the second end of the material dropping channel is connected to the boiler, one end of the conveyor is connected to the shredder, the other end of the conveyor is connected to the intermediate storage bin to transport materials to the intermediate storage bin, and the air supply mechanism is connected to the material dropping channel to supply air into the material dropping channel.
[0005] The coal-fired boiler coupled incineration and disposal of biomass scraps system according to the embodiment of the utility model has the advantages of full biomass utilization, reduced power generation costs and good equipment safety. The application has the following advantages: biomass scraps have a certain calorific value (1800 kcal) and are cheap, which can play a certain role in reducing the procurement cost of traditional coal-fired power plants. When biomass scraps participate in combustion, the influence of biomass fuel on the coal transportation of boiler 11 is avoided, ensuring the safety of boiler operation.
[0006] In some embodiments, an isolation door is provided at the bottom of the receiving bin, and the isolation door is used to open and close the bottom of the receiving bin.
[0007] In some embodiments, a load-bearing door and a sealing door are sequentially arranged at the bottom of the intermediate storage bin from top to bottom. The load-bearing door is used to bear the materials in the intermediate storage bin, and the sealing door is used to open and close the bottom of the intermediate storage bin to allow the materials to enter the material drop channel. The load-bearing door and the sealing door are spaced a certain distance apart.
[0008] In some embodiments, the air supply mechanism includes a cold primary air duct, which is connected to the blanking channel to supply cold primary air into the blanking channel.
[0009] In some embodiments, an isolation valve is provided on the cold primary air duct to control the air intake volume.
[0010] In some embodiments, the air supply mechanism further includes a tail flue, which is respectively connected to the intermediate storage bin, the conveyor and the receiving bin to exhaust smoke.
[0011] In some embodiments, the vertical height of the receiving bin is lower than the vertical height of the intermediate storage bin.
[0012] In some embodiments, the first end of the material dropping channel is connected to the intermediate storage bin, and the second end of the material dropping channel has a slope for allowing the material to slide along the slope and enter the boiler.
[0013] In some embodiments, the boiler is provided with an overburnt air nozzle and a pulverized coal main burner, and the vertical height of the overburnt air nozzle is higher than the vertical height of the pulverized coal main burner.
[0014] In some embodiments, the connection between the material dropping channel and the boiler is located between the overburnt air nozzle and the pulverized coal main burner. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural schematic diagram of a system for treating biomass scraps by coupling incineration with a coal-fired boiler according to an embodiment of the utility model.
[0016] Figure numerals: 1. Receiving bin; 2. Intermediate storage bin; 3. Conveyor; 4. Isolation door; 5. Load-bearing door; 6. Sealed door; 7. Dropping channel; 8. Cold primary air duct; 9. Isolation valve; 10. Tail flue; 11. Boiler; 12. Burnout air nozzle; 13. Coal powder main burner; 14. Shredder. DETAILED DESCRIPTION
[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.
[0018] According to the coal-fired boiler coupled incineration and disposal of biomass scraps system of the embodiment of the utility model, the coal-fired boiler coupled incineration and disposal of biomass scraps system includes a receiving bin 1, an intermediate storage bin 2, a conveyor 3 and an air supply mechanism, the bottom of the receiving bin 1 is connected to the shredder 14, the bottom of the intermediate storage bin 2 is connected to the first end of the material dropping channel 7, the second end of the material dropping channel 7 is connected to the boiler 11, one end of the conveyor 3 is connected to the shredder 14, the other end of the conveyor 3 is connected to the intermediate storage bin 2 to transport materials to the intermediate storage bin 2, and the air supply mechanism is connected to the material dropping channel 7 to supply air into the material dropping channel 7. The receiving bin 1 is used to receive biomass scraps. The shredder 14 at the bottom of the receiving bin 1 breaks the materials into small particles. The conveyor 3 transports the materials to the intermediate storage bin 2 for storage. When feeding into the boiler 11, the bottom of the intermediate storage bin 2 is opened, and the materials enter the material drop channel 7 through the channel and enter the boiler 11 for incineration. The air supply mechanism supplies air to the material drop channel 7 to form a positive pressure in the boiler 11 and the material drop channel 7, making feeding more convenient. The separate biomass conveying path avoids the impact on the coal powder conveying mechanism of the boiler 11, ensuring the safe operation of the boiler 11.
[0019] The coal-fired boiler coupled incineration and disposal system for biomass scraps according to the embodiment of the utility model has the advantages of full utilization of biomass, reduced power generation cost and good equipment safety.
[0020] In some embodiments, an isolation door 4 is provided at the bottom of the receiving bin 1 , and the isolation door 4 is used to open and close the bottom of the receiving bin 1 .
[0021] Specifically, the isolation door 4 moves relative to the receiving bin 1 to close and open the bottom opening of the receiving bin 1. Controlling the isolation door 4 can change the amount and speed of the falling material in the receiving bin 1, thereby controlling the processing volume of the shredder 14.
[0022] In some embodiments, a load-bearing door 5 and a sealing door 6 are sequentially arranged at the bottom of the intermediate storage bin 2 from top to bottom. The load-bearing door 5 is used to bear the materials in the intermediate storage bin 2, and the sealing door 6 is used to open and close the bottom of the intermediate storage bin 2 to allow the materials to enter the material drop channel 7. The load-bearing door 5 and the sealing door 6 are spaced a certain distance apart.
[0023] Specifically, the load-bearing door 5 blocks the material in the intermediate storage bin 2 from sliding down, preventing the material from entering the blanking channel 7 uncontrollably. The sealing door 6 can open and close the blanking hole between the intermediate storage bin 2 and the blanking channel 7. When feeding, the load-bearing door 5 is opened first, and the material falls onto the sealing door 6. After closing the load-bearing door 5, the sealing door 6 is opened, and a certain amount of material is sent to the boiler 11 through the blanking channel 7 for incineration. The load-bearing door 5 and the sealing door 6 are spaced a certain distance apart to facilitate the storage of a certain amount of biomass scraps, and the size of the spacing affects the amount of each feeding. The setting of the load-bearing door 5 and the sealing door 6 can also prevent the leakage of cold primary air (positive pressure) to the outside.
[0024] In some embodiments, the air supply mechanism includes a cold primary air duct 8 , which is connected to the blanking channel 7 to supply cold primary air into the blanking channel 7 .
[0025] Specifically, the cold primary air duct 8 is connected to the primary fan outlet of the boiler 11. The relatively high pressure of the cold primary air can make the fuel float, making it easier to deliver the biomass scraps into the boiler 11; the temperature of the cold primary air is low (about 30°C), which can prevent the spontaneous combustion of the fuel, and cool the drop port to ensure the safe operation of the boiler 11 and the safety of the drop channel 7 to prevent ignition of the materials in the intermediate storage bin 2.
[0026] In some embodiments, an isolation valve 9 is provided on the cold primary air duct 8 to control the air intake volume.
[0027] Specifically, the isolation valve 9 controls the air intake volume to ensure that the cold primary air forms a positive pressure in the blanking channel 7, thereby avoiding residual material particles in the blanking channel 7.
[0028] In some embodiments, the air supply mechanism further includes a tail flue 10, which is respectively connected to the intermediate storage bin 2, the conveyor 3 and the receiving bin 1 to exhaust smoke.
[0029] Specifically, the tail flue 10 is connected to multiple locations and is used to discharge smoke from various areas, thereby reducing the amount of smoke entering the intermediate storage bin 2 and the receiving bin 1 during the feeding process, thereby ensuring safe storage of materials.
[0030] In some embodiments, the height of the receiving bin 1 in the vertical direction is lower than the height of the intermediate storage bin 2 in the vertical direction.
[0031] Specifically, the height of the receiving bin 1 is lower than that of the intermediate storage bin 2 , so that vehicles can transport the biomass scraps and dump them into the receiving bin 1 .
[0032] In some embodiments, a first end of the material dropping channel 7 is connected to the intermediate storage bin 2 , and a second end of the material dropping channel 7 has an inclined surface for allowing the material to slide down the inclined surface and enter the boiler 11 .
[0033] Specifically, the shape of the material dropping channel 7 is approximately bucket-shaped, and the second end of the material dropping channel 7 is inclined relative to the vertical direction to form an inclined surface, so that the biomass scraps slide down the inclined surface under the influence of gravity into the boiler 11, reducing the involvement of conveying equipment and facilitating rapid feeding. The expansion of the second end of the material dropping channel 7 can also increase the storage capacity of the material.
[0034] In some embodiments, an overburnt air nozzle 12 and a pulverized coal main burner 13 are provided on the boiler 11 , and the overburnt air nozzle 12 has a higher vertical height than the pulverized coal main burner 13 .
[0035] Specifically, the boiler 11 is provided with a separate burner for the coal powder to enter, so as to avoid the influence of the biomass scraps on the coal powder transportation, pulverizing and feeding systems, thereby ensuring the safe operation of the boiler 11.
[0036] In some embodiments, the connection between the material dropping channel 7 and the boiler 11 is located between the overburnt air nozzle 12 and the pulverized coal main burner 13 .
[0037] Specifically, the furnace temperature is high and the oxygen content is sufficient at the location between the pulverized coal main burner 13 and the overburnt air, so that the biomass scraps can be completely burned.
[0038] 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 a limitation on the present invention.
[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0042] In the present utility model, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0043] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.
Claims
1. A coal-fired boiler coupled incineration and disposal system for biomass scraps, characterized in that: include: A receiving bin, the bottom of which is connected to the shredder; An intermediate storage bin, wherein the bottom of the intermediate storage bin is connected to the first end of the material dropping channel, and the second end of the material dropping channel is connected to the boiler; A conveyor, one end of which is connected to the shredder, and the other end of which is connected to the intermediate storage bin to convey materials to the intermediate storage bin; An air supply mechanism is connected to the blanking channel to supply air into the blanking channel.
2. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 1 is characterized in that: An isolation door is arranged at the bottom of the receiving bin, and the isolation door is used to open and close the bottom of the receiving bin.
3. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 1 is characterized in that: A load-bearing door and a sealing door are sequentially arranged at the bottom of the intermediate storage bin from top to bottom. The load-bearing door is used to bear the materials in the intermediate storage bin, and the sealing door is used to open and close the bottom of the intermediate storage bin to allow the materials to enter the material dropping channel. The load-bearing door and the sealing door are spaced a certain distance apart.
4. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 1 is characterized in that: The air supply mechanism comprises a cold primary air duct, and the cold primary air duct is connected with the blanking channel to supply cold primary air into the blanking channel.
5. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 4 is characterized in that: An isolation valve is provided on the cold primary air duct to control the air intake volume.
6. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 4 is characterized in that: The air supply mechanism also includes a tail flue, which is respectively connected to the intermediate storage bin, the conveyor and the receiving bin to exhaust smoke.
7. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 1, characterized in that: The height of the receiving bin in the vertical direction is lower than the height of the intermediate storage bin in the vertical direction.
8. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 1, characterized in that: The first end of the material dropping channel is connected to the intermediate storage bin, and the second end of the material dropping channel has an inclined surface for allowing the material to slide along the inclined surface and enter the boiler.
9. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 1, characterized in that: The boiler is provided with an overburnt air nozzle and a pulverized coal main burner, and the overburnt air nozzle is higher in the vertical direction than the pulverized coal main burner.
10. The coal-fired boiler coupled incineration and disposal of biomass scraps system according to claim 9, characterized in that: The connection between the material dropping channel and the boiler is located between the overburnt air nozzle and the pulverized coal main burner.