Fly ash transfer system and fly ash plant using the same

Abstract

The application relates to the technical field of fly ash treatment, in particular to a fly ash transfer system and a fly ash workshop applying the same. The fly ash transfer system comprises an auxiliary conveying part which is located below the bottom of an ash storage and is in sealed connection with a discharging port of the bottom of the ash storage, the auxiliary conveying part comprises a lower discharging screw structure, a gas locking structure and a lower discharging connecting pipe which are sequentially and sealingly connected; a screw conveyor which is located below the auxiliary conveying part, is transversely extended with a screw conveying cavity, has a conveyor feeding port which is sealingly connected with the lower discharging connecting pipe and is arranged at the top close to one end, and has a conveyor discharging port which is arranged at the bottom close to the other end; a bulk machine which is located below the conveyor discharging port, has a bulk machine feeding port which is sealingly connected with the conveyor discharging port and is arranged at the top, and has a bulk machine discharging port which is used for being sealingly connected with a feeding port of a canning vehicle and is arranged at the bottom; and a control unit. The technical problems of low work efficiency and easy fly ash leakage and scattering pollution in the prior art are solved, and the fly ash is efficiently and sealingly transferred.

Description

Technical Field

[0001] This application relates to the field of fly ash treatment technology, and in particular to a fly ash transfer system and a fly ash workshop using the same. Background Technology

[0002] The traditional process for treating waste in fly ash storage facilities is: fly ash chelation and solidification → curing → landfill. However, this method does not meet the policy requirements of "zero hazardous waste landfill" and "achieving 100% resource utilization of fly ash", and therefore needs to be upgraded and transformed.

[0003] The existing method for transporting fly ash is to chelate and solidify the fly ash, bag it, send it to the curing room for storage, and then load it onto trucks for transport and co-processing. However, this method is inefficient, labor-intensive, and lacks independent transport control. The original equipment has a one-button start system for chelation, but ash discharge can only be controlled manually on a per-unit basis, which is too inefficient. Furthermore, during operation, fly ash leakage is prone to occur, causing pollution and even leading to excessive concentrations of fly ash in fugitive emissions. Utility Model Content

[0004] The purpose of this application is to provide a fly ash transfer system and a fly ash workshop using the same, so as to solve the technical problems of low working efficiency and easy leakage and scattering of fly ash in the existing fly ash external transportation technology, and to achieve efficient and sealed fly ash transfer.

[0005] Firstly, this application provides a fly ash transfer system, comprising:

[0006] An auxiliary conveying unit located below the bottom of the ash silo and sealed to the bottom outlet of the ash silo, comprising a feeding spiral structure, an airlock structure, and a feeding connecting pipe that are sealed and connected sequentially from top to bottom; and

[0007] The screw conveyor located below the auxiliary conveying section has a laterally extending screw conveying chamber. Near one end of its top is a conveyor inlet that is sealed to the discharge connecting pipe, and near the other end of its bottom is a conveyor outlet.

[0008] The bulk loader, located below the discharge port of the conveyor, has a bulk loader inlet at its top and a bulk loader outlet at its bottom that is sealed to the discharge port of the conveyor; and a bulk loader outlet that is sealed to the inlet of the tank truck.

[0009] A control unit that is connected to the auxiliary conveying unit, the screw conveyor, and the bulk loader.

[0010] Furthermore, the auxiliary conveying unit also includes a fly ash crushing device, which is located at the discharge port at the bottom of the ash silo and above the feeding spiral structure. The fly ash crushing device is equipped with a crushing structure, which is a crushing tooth structure or a crushing roller structure.

[0011] Furthermore, a first gate valve is provided between the discharge port at the bottom of the ash silo and the top of the fly ash crushing device; and / or

[0012] The bottom of the fly ash crushing device is provided with an inspection hole structure, and the bottom of the inspection hole structure is detachably and sealed to the top of the feeding spiral structure.

[0013] Furthermore, the auxiliary conveying unit includes a first auxiliary conveying unit and a second auxiliary conveying unit respectively disposed at the bottom of the No. 1 ash silo and the No. 2 ash silo, and the screw conveyor includes a first screw conveyor and a second screw conveyor respectively located below the first auxiliary conveying unit and the second auxiliary conveying unit;

[0014] The No. 1 ash silo is connected to the bulk loading machine via the first auxiliary conveying unit and the first screw conveyor in sequence, and the No. 2 ash silo is connected to the bulk loading machine via the second auxiliary conveying unit, the second screw conveyor and the first screw conveyor in sequence.

[0015] Furthermore, the first conveyor inlet of the first screw conveyor is located close to its first end, and a secondary conveyor inlet is provided between the first end of the first screw conveyor and the first conveyor inlet.

[0016] The first conveyor inlet of the first screw conveyor is sealed to the first discharge connecting pipe of the first auxiliary conveying unit, and the first conveyor outlet at the bottom of the first screw conveyor near the other end opposite to the first end is sealed to the bulk feeder inlet of the bulk loader.

[0017] The second conveyor inlet near one end of the second screw conveyor is sealed to the second discharge connecting pipe of the second auxiliary conveying unit, and the second conveyor outlet near the other end of the second screw conveyor is connected to the secondary conveyor inlet through a secondary connecting pipe.

[0018] Furthermore, the screw conveyor includes a drive motor, and the screw conveying cavity is provided with screw blades. The drive motor can drive the screw blades to rotate and transport fly ash.

[0019] There is a gap between the helical blade and the helical transport cavity, and the gap is 10~15mm.

[0020] Furthermore, the feeding screw structure is also connected to an external screw conveyor, which is connected to the chelating system, and a third gate valve is provided at the connection between the external screw conveyor and the chelating system; and / or

[0021] A second gate valve is also provided between the feeding spiral structure and the airlock structure.

[0022] Furthermore, the fly ash transfer system also includes a dust collection fan connected to the bulk loader, and the suction pipe of the dust collection fan is connected to the periphery of the discharge port of the lifting hose of the bulk loader.

[0023] Furthermore, the dust collection fan is connected to the dust collector at the top of the ash silo via a dust collection duct.

[0024] Furthermore, the fly ash transfer system also includes an electric heat tracing structure, which is wrapped around the outer periphery of the auxiliary conveying section and the screw conveyor;

[0025] The outer periphery of the electric heat tracing structure is also bound with a heat insulation layer by galvanized iron wire.

[0026] The outer surfaces of the auxiliary conveying unit and the screw conveyor are also coated with a modified epoxy anti-corrosion coating.

[0027] Secondly, the fly ash workshop provided in this application includes the fly ash transfer system described in any one of the preceding descriptions, wherein a gate is added to the fly ash workshop near the slag pit, and the width of the gate is ≥4m.

[0028] The fly ash workshop includes a hardened road surface with a thickness of ≥300mm and double-layered steel reinforcement.

[0029] Compared with the prior art, the fly ash transfer system and fly ash workshop using the present application provide at least one ash silo, with an ash silo inlet at the top and an ash silo outlet at the bottom. The fly ash transfer system includes an auxiliary conveying unit located below the bottom of the ash silo and sealed to the ash silo outlet at the bottom of the ash silo, a screw conveyor located below the auxiliary conveying unit, a bulk loader located below the conveyor outlet of the screw conveyor, and a control unit controlled and connected to the auxiliary conveying unit, the screw conveyor, and the bulk loader.

[0030] The auxiliary conveying unit includes at least a feeding spiral structure, an airlock structure, and a feeding connecting pipe that are sequentially and sealed together. The feeding spiral structure has an internal spiral structure, which not only serves to transport the fly ash but also crushes and cuts it, preventing blockage. The airlock structure can be an airlock device, a discharge valve, etc., which prevents air backflow and seals to prevent fly ash leakage. The feeding connecting pipe is used to connect to the spiral conveyor below. The spiral conveyor has a laterally extending spiral conveying chamber, which transports the fly ash along the laterally extending spiral conveying chamber to the next stage bulk loading machine. The top of the spiral conveyor near one end has a conveyor inlet that is sealed to the aforementioned feeding connecting pipe, and the bottom of the spiral conveyor near the other end has a conveyor outlet. The top and bottom of the bulk loading machine have a bulk loading machine inlet that is sealed to the conveyor outlet and a bulk loading machine outlet that is sealed to the tanker truck inlet, respectively. The bulk loading machine automatically loads and unloads the fly ash into the tanker truck for internal and external transportation.

[0031] With this configuration, the fly ash transfer system achieves fully automated fly ash transfer. Each structural component operates independently yet works in concert. The control unit coordinates with all components to achieve efficient and sealed transfer of fly ash, and provides independent control of the entire fly ash transfer system, improving work efficiency. Furthermore, the sealed connections between all structural joints effectively prevent fly ash leakage and pollution. The airlock structure not only seals against leakage but also prevents air backflow. Additionally, the internal spiral cutting structure and spiral conveyor not only transport the fly ash but also cut and crush it at different stages during transport, preventing blockages and ensuring normal and effective transport, thus improving efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is a cross-sectional schematic diagram of the fly ash transfer system provided in the embodiments of this application;

[0034] Figure 2 This is a side view of the fly ash transfer system provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of the auxiliary conveying unit provided in the embodiments of this application;

[0036] Figure 4 This is a schematic diagram of the structure of the first screw conveyor and bulk carrier provided in the embodiments of this application;

[0037] Figure 5 This is a schematic diagram of the structure of the second spiral conveyor provided in the embodiments of this application;

[0038] Figure 6 This is a control flowchart of the fly ash transfer system provided in an embodiment of this application.

[0039] Figure label:

[0040] 11-First Auxiliary Conveying Unit;

[0041] 111 - First Crusher;

[0042] 112 - Structure of the first inspection hole;

[0043] 113 - First feeding spiral structure;

[0044] 114 - First ash discharge valve;

[0045] 115 - First feeding connecting pipe;

[0046] 12-Second Auxiliary Conveying Unit;

[0047] 121 - Second Crusher;

[0048] 122 - Second inspection hole structure;

[0049] 123 - Second feeding spiral structure;

[0050] 124 - Second ash discharge valve;

[0051] 125 - Second feeding connecting pipe;

[0052] 21-First spiral conveyor;

[0053] 211 - First conveyor feed inlet;

[0054] 212 - First conveyor discharge port;

[0055] 213 - Secondary transport inlet;

[0056] 214 - Secondary connection piping;

[0057] 215 - First drive motor;

[0058] 216 - First helical blade;

[0059] 22 - Second spiral conveyor;

[0060] 221 - Second transport aircraft inlet;

[0061] 222 - Discharge port of the second conveyor;

[0062] 223 - Second drive motor;

[0063] 224 - Second helical blade;

[0064] 23 - External screw conveyor;

[0065] 31-First slide gate valve;

[0066] 32 - Second slide gate valve;

[0067] 33 - Third slide gate valve;

[0068] 40 - Bulk loading machine;

[0069] 41 - Bulk feed inlet;

[0070] 42-Lifting hose;

[0071] 421 - Bulk feeder discharge port;

[0072] 50 - Dust collection fan;

[0073] 51-Suction tube;

[0074] 52-Dust removal duct;

[0075] 61-No. 1 Gray Warehouse;

[0076] 611 - First ash silo discharge port;

[0077] 612 - First dust collector;

[0078] 62-No. 2 Ash Warehouse;

[0079] 621 - Second ash silo discharge port;

[0080] 622 - Second dust collector. Detailed Implementation

[0081] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0082] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0083] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0084] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0085] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0086] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0087] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0088] like Figure 1 and Figure 2As shown in the figure, this application embodiment provides a fly ash transfer system and an ash silo and ash silo workshop using the fly ash transfer system. The ash silo workshop has at least one ash silo, preferably two ash silos, namely Ash Silo 1 61 and Ash Silo 2 62. The advantages of setting two ash silos are: first, the two ash silos can operate simultaneously, resulting in high work efficiency; second, setting two ash silos can effectively prevent situations where one ash silo temporarily malfunctions or becomes blocked, while the other ash silo can still be used normally, ensuring that the work proceeds in an orderly and normal manner without affecting normal work.

[0089] The ash silo is equipped with a feed inlet at the top and a discharge outlet at the bottom, namely the first ash silo discharge outlet 611 and the second ash silo discharge outlet 621; the top of the ash silo may be equipped with dust collectors, namely the first dust collector 612 and the second dust collector 622, to prevent fly ash from escaping from the gaps at the top of the ash silo and causing pollution to the surrounding environment.

[0090] like Figures 1 to 5 As shown, the fly ash transfer system provided in this application embodiment may include an auxiliary conveying unit (such as a first auxiliary conveying unit 11 or a second auxiliary conveying unit 12) located below the bottom of the ash silo and sealed to the ash silo outlet (such as a first ash silo outlet 611 or a second ash silo outlet 621) at the bottom of the ash silo, a screw conveyor (such as a first auxiliary conveying unit 11 or a second auxiliary conveying unit 12) located below the auxiliary conveying unit, a bulk loader 40 located below the conveyor outlet (such as a first conveyor inlet 211 or a second conveyor inlet 221) of the screw conveyor, and a control unit controlled and connected to the auxiliary conveying unit, the screw conveyor, and the bulk loader 40.

[0091] like Figures 1 to 3 As shown, the auxiliary conveying unit may include a feeding spiral structure (such as the first feeding spiral structure 113 and the second feeding spiral structure 123) that are sequentially and sealed together, an airlock structure, and a feeding connecting pipe (such as the first feeding connecting pipe 115 and the second feeding connecting pipe 125) for connecting to the spiral conveyor below. The feeding spiral structure has a spiral cutting structure inside, such as spiral blades, which can not only carry out feeding and conveying but also crush and cut fly ash to prevent feeding blockage. The airlock structure may specifically be an airlock or an ash discharge valve (such as the first ash discharge valve 114 and the second ash discharge valve 124), which can prevent air backflow and seal to prevent fly ash leakage.

[0092] like Figure 1 , Figure 4 and Figure 5As shown, the screw conveyor has a laterally extending screw conveying chamber, which contains screw blades (such as the first screw blade 216 and the second screw blade 224) and a drive motor (such as the first drive motor 215 and the second drive motor 223). The drive motor can drive the screw blades to rotate and transport fly ash, which can transport fly ash along the laterally extending screw conveying chamber to the next stage bulk loading machine 40. The top of the screw conveyor near one end is provided with a conveyor inlet (such as the first conveyor inlet 211 and the second conveyor inlet 221) that is sealed to the discharge connecting pipe, and the bottom of the screw conveyor near the other end is provided with a conveyor outlet (such as the first conveyor outlet 212 and the second conveyor outlet 222).

[0093] like Figure 1 and Figure 4 As shown, the top and bottom of the bulk loader 40 are respectively provided with a bulk loader inlet 41 that is sealed to the discharge port of the conveyor and a bulk loader outlet 421 that is sealed to the inlet of the tank truck. The bulk loader 40 plays the role of automatic loading and unloading, automatically loading and unloading fly ash into the tank truck for internal and external transportation.

[0094] Furthermore, the fly ash transfer system also includes a dust collection fan 50 connected to the bulk loader 40, and the suction pipe 51 of the dust collection fan 50 is connected to the periphery of the discharge port (i.e., the bulk loader discharge port 421) of the lifting hose 42 of the bulk loader 40, ensuring a sealed connection with the inlet of the tanker truck during fly ash loading and unloading, preventing fly ash leakage, and ensuring the system's airtightness and environmental pollution. Additionally, the dust collection fan 50 can also be connected to the dust collectors (such as the first dust collector 612 and the second dust collector 622) on top of the ash silos (such as ash silo 1 61 and ash silo 2 62) via a dust collection duct 52, so that the collected fly ash dust is returned to the dust collector for centralized processing.

[0095] Compared with the prior art, the fly ash transfer system provided in this application embodiment achieves fully automated fly ash transfer. Each structural part is independent yet cooperative. The control unit coordinates with each part to achieve efficient and sealed transfer of fly ash and realizes independent control of the entire fly ash transfer system, improving work efficiency. Moreover, the connection between each structure is sealed to effectively prevent fly ash leakage and pollution. In particular, the airlock structure not only seals to prevent fly ash leakage but also prevents air backflow. Furthermore, the internal spiral cutting structure and spiral conveyor not only perform the function of transportation but also cut and crush the fly ash at different stages during transportation, preventing blockage during transportation, ensuring normal and effective transportation, and improving transportation efficiency.

[0096] Furthermore, a preferred embodiment is, as follows: Figures 1 to 3As shown, the aforementioned auxiliary conveying unit also includes a fly ash crushing device, which can be a crusher, such as a first crusher 111 and a second crusher 121. The fly ash crushing device is located at the discharge port at the bottom of the ash silo (i.e., the discharge port 611 of the first ash silo and the discharge port 621 of the second ash silo) and is located above the feeding spiral structure. The fly ash crushing device is equipped with a crushing structure, which is a crushing tooth structure or a crushing roller structure, etc.

[0097] The fly ash crushing device is installed to crush the fly ash from the ash silo, solving the problem of blockage caused by lumpy ash, and reducing the particle size to ≤20mm to meet the requirements of subsequent conveying and processing, and to adapt it to the corrosive environment of fly ash. Specifically, an 800x800 crusher is preferred, although a 400x400 crusher can also be used, but its flow rate is less than 25t / h, and it can be selected for certain applications.

[0098] Based on the aforementioned embodiments, a first gate valve 31 can be installed between the discharge port at the bottom of the ash silo (i.e., the first ash silo discharge port 611 and the second ash silo discharge port 621) and the top of the fly ash crushing device. Specifically, the first gate valve 31 can be made of 316L material, giving it good corrosion resistance. On the one hand, the amount of ash discharged can be precisely controlled by controlling the opening and closing degree of the first gate valve 31; on the other hand, it can serve as an isolation device during crusher maintenance. Furthermore, mounting holes can be opened at the bottom of the ash silo for installing and fixing the crusher and the gate valve, ensuring that they are firmly installed and accurately positioned.

[0099] Furthermore, the fly ash transfer system provided in this application embodiment is equipped with inspection hole structures at multiple different locations in sections to facilitate segmented inspection for ash blockage and subsequent cleaning of accumulated ash. Specifically, the bottom of the fly ash crushing device can be connected to an inspection hole structure (such as the first inspection hole structure 112 and the second inspection hole structure 122), and the bottom of the inspection hole structure is detachably and sealingly connected to the top of the feeding screw structure (such as the first feeding screw structure 113 and the second feeding screw structure 123). Specifically, the inspection hole structure can be closed with a detachable sealing cover plate, and the cover plate can be opened for operation when it is necessary to clean the accumulated ash.

[0100] It is understood that the embodiments of this application may provide one set of the aforementioned auxiliary conveying unit and screw conveyor for one ash silo, or two or more sets of the aforementioned auxiliary conveying unit and screw conveyor may be provided for two or more ash silos.

[0101] One specific embodiment is, as follows: Figure 1 As shown in the figure, the embodiment of this application takes the case of having two gray warehouses, namely gray warehouse No. 1 61 and gray warehouse No. 2 62, as an example for the following specific example.

[0102] The auxiliary conveying unit includes a first auxiliary conveying unit 11 and a second auxiliary conveying unit 12 respectively located at the bottom of the No. 1 ash silo 61 and the No. 2 ash silo 62. The screw conveyor includes a first screw conveyor 21 and a second screw conveyor 22 respectively located below the first auxiliary conveying unit 11 and the second auxiliary conveying unit 12. The first conveyor inlet 211 of the first screw conveyor 21 is located near its first end, which is the end closer to the first auxiliary conveying unit 11. A secondary conveying inlet 213 is also provided between the first end of the first screw conveyor 21 and the first conveyor inlet 211 for receiving fly ash feed from the second screw conveyor 22.

[0103] The primary transportation process is as follows: the first conveyor inlet 211 of the first screw conveyor 21 is sealed to the first discharge connecting pipe 115 of the first auxiliary conveying section 11, which is connected to the No. 1 ash silo 61; the first conveyor outlet 212 at the bottom of the first screw conveyor 21, near the opposite end to its first end, is sealed to the bulk loader inlet 41 of the bulk loader 40. The No. 1 ash silo 61 is then connected to the bulk loader 40 via the first auxiliary conveying section 11 and the first screw conveyor 21, thus realizing the transfer of fly ash.

[0104] The secondary transport process is as follows: the second conveyor inlet 221 near one end of the second screw conveyor 22 is sealed to the second discharge connecting pipe 125 of the second auxiliary conveying section 12, which is connected to the No. 2 ash silo 62. The second conveyor outlet 222 near the other end of the second screw conveyor 22 is connected to the secondary transport inlet 213 of the first screw conveyor 21 via a secondary connecting pipe 214. The fly ash from the No. 2 ash silo 62 is first transported to the second screw conveyor 22 via the second auxiliary conveying section 12, then to the first screw conveyor 21 via the second screw conveyor 22, and finally to the bulk loading machine 40 via the first screw conveyor 21, thus realizing the transfer of fly ash from the No. 2 ash silo 62. This configuration enables simultaneous and efficient fly ash transfer from multiple ash silos, improving transport efficiency.

[0105] Specifically, on the one hand, the height of the first discharge connecting pipe 115 must be greater than the height of the second discharge connecting pipe 125; on the other hand, it is necessary to ensure that each feed inlet is vertical so that fly ash can smoothly enter the screw conveyor.

[0106] Optionally, to ensure smooth conveying, it is best to ensure a total conveying capacity of ≥25t / h. Optionally, to effectively avoid ash blockage, there may be a gap between the spiral blades (such as the first spiral blade 216 and the second spiral blade 224) of the aforementioned spiral conveyor and the spiral conveying chamber, which may be 10~15mm; Optionally, the spiral conveyor can be replaced with a submerged scraper conveyor of the same flow rate, such as the MS400 type submerged scraper conveyor, but it is necessary to ensure that there is no ash accumulation during horizontal conveying.

[0107] Furthermore, the fly ash transfer system provided in this application embodiment also supports switching between "external transport / bagging" modes, meeting the needs for flexible disposal. Specifically, such as... Figure 2 As shown, the aforementioned feeding spiral structure (such as the first feeding spiral structure 113 and the second feeding spiral structure 123) can also be connected to an external spiral conveyor 23. This external spiral conveyor 23 is connected to a chelating system, which can perform fly ash bagging. Furthermore, a third gate valve 33 is provided at the connection between the external spiral conveyor 23 and the chelating system for manual isolation.

[0108] Furthermore, a second gate valve 32 can be provided between the feeding spiral structure and the airlock structure for isolation, maintenance, and mode switching.

[0109] In a preferred embodiment, the fly ash transfer system provided in this application may further include an electric heat tracing structure, which is wrapped around the outer periphery of the aforementioned auxiliary conveying section and screw conveyor. The electric heat tracing structure generates heat through heating elements, keeping the auxiliary conveying section and screw conveyor within a suitable temperature range and preventing fly ash from agglomerating due to low temperature. When wrapping the electric heat tracing structure, ensure that the structure is evenly distributed. Temperature transmitters can be installed at both ends for real-time temperature monitoring and automatic adjustment of the power of the electric heat tracing structure based on temperature changes.

[0110] Furthermore, the outer periphery of the electric heat tracing structure can be bound with an insulation layer using galvanized iron wire, preferably with a thickness ≥100mm, to further reduce heat loss and ensure the temperature stability of the system. Specifically, the insulation layer can be bound layer by layer to ensure the integrity and sealing of the insulation layer.

[0111] Furthermore, the outer surfaces of the aforementioned auxiliary conveying unit and screw conveyor can also be coated with a modified epoxy anti-corrosion coating. Preferably, it consists of two layers of primer, one layer of intermediate paint, and two layers of topcoat, with a total thickness ≥200μm, giving it excellent corrosion and high-temperature resistance, effectively resisting corrosive substances in fly ash and the erosion of high-temperature environments, thus extending the service life of the equipment. Optionally, this modified epoxy anti-corrosion coating can be replaced with a polyurea coating of equivalent corrosion resistance, but the dry film thickness must be guaranteed to be ≥2mm.

[0112] This application embodiment uses a "three-proof" auxiliary structure consisting of an electric heat tracing structure, an insulation layer, and a modified epoxy coating to effectively adapt to low-temperature environments and extend equipment life.

[0113] This application embodiment also provides a fly ash workshop, which includes the aforementioned fly ash transfer system, and the fly ash workshop is equipped with at least one ash silo. Preferably, a gate is added to the fly ash workshop near the slag pit, and the width of the gate is ≥4m to meet the space requirements for tank trucks to enter and exit. Preferably, the fly ash workshop includes a hardened road surface with a thickness of ≥300mm. The hardened road surface is preferably hardened with C30 concrete and reinforced with double layers of steel bars to ensure that the ground can withstand the weight of heavy vehicles such as tank trucks, and to ensure traffic safety and stability during the production process.

[0114] like Figure 6 As shown, the aforementioned control unit can sequentially control the start-up of the electric heating structure, bulk loader, screw conveyor, ash discharge valve, feeding screw structure and crusher. If necessary, the ash silo vibrating motor can be started. The stopping sequence is reversed. After starting each structure, feedback on equipment operation and normal operation is required.

[0115] Furthermore, the control unit is also equipped with an automatic shutdown alarm module. During equipment operation, when a fault is detected in a certain piece of equipment, the control unit can promptly trigger the automatic shutdown alarm function. Specifically, it can remind operators to handle the situation through audible and visual alarms to ensure the safe and stable operation of the system.

[0116] In one specific embodiment, the control unit can be an independent control box. The control unit supports switching between "external transport / bagging" modes, and operators can switch modes on the independent control box according to actual needs. Specifically, the independent control box can be connected to the electrical wiring of each structural device, and an interlocking program can be written. The start sequence of the interlocking program is: electric heating structure → bulk loader → fan → screw conveyor → ash discharge valve → crusher; the stop sequence is the reverse. After the program is written, the control unit is debugged to ensure that each device can start and stop in the predetermined sequence and to provide timely alarms in case of equipment failure. Simultaneously, the switching function with the chelation system is tested to ensure stable operation of the system under different working modes.

[0117] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A fly ash transfer system, characterized in that, include: The auxiliary conveying unit, located below the bottom of the ash silo and sealed to the bottom outlet of the ash silo, includes a feeding spiral structure, an airlock structure, and a feeding connecting pipe that are sealed and connected in sequence from top to bottom. and The screw conveyor located below the auxiliary conveying section has a laterally extending screw conveying chamber. Near one end of its top is a conveyor inlet that is sealed to the discharge connecting pipe, and near the other end of its bottom is a conveyor outlet. The bulk loader, located below the discharge port of the conveyor, has a bulk loader inlet at its top and a bulk loader outlet at its bottom that is sealed to the discharge port of the conveyor; and a bulk loader outlet that is sealed to the inlet of the tank truck. A control unit that is connected to the auxiliary conveying unit, the screw conveyor, and the bulk loader.

2. The fly ash transfer system according to claim 1, characterized in that, The auxiliary conveying unit also includes a fly ash crushing device, which is located at the discharge port at the bottom of the ash silo and above the feeding spiral structure. The fly ash crushing device is equipped with a crushing structure, which is a crushing tooth structure or a crushing roller structure.

3. The fly ash transfer system according to claim 2, characterized in that, A first gate valve is provided between the discharge port at the bottom of the ash silo and the top of the fly ash crushing device; and / or The bottom of the fly ash crushing device is provided with an inspection hole structure, and the bottom of the inspection hole structure is detachably and sealed to the top of the feeding spiral structure.

4. The fly ash transfer system according to any one of claims 1 to 3, characterized in that, The auxiliary conveying unit includes a first auxiliary conveying unit and a second auxiliary conveying unit respectively located at the bottom of the No. 1 ash silo and the No. 2 ash silo, and the screw conveyor includes a first screw conveyor and a second screw conveyor respectively located below the first auxiliary conveying unit and the second auxiliary conveying unit; The No. 1 ash silo is connected to the bulk loading machine via the first auxiliary conveying unit and the first screw conveyor in sequence, and the No. 2 ash silo is connected to the bulk loading machine via the second auxiliary conveying unit, the second screw conveyor and the first screw conveyor in sequence.

5. The fly ash transfer system according to claim 4, characterized in that, The first conveyor inlet of the first spiral conveyor is located near its first end, and a secondary conveyor inlet is provided between the first end of the first spiral conveyor and the first conveyor inlet; The first conveyor inlet of the first screw conveyor is sealed to the first discharge connecting pipe of the first auxiliary conveying unit, and the first conveyor outlet of the first screw conveyor near the bottom of the other end opposite to the first end is sealed to the bulk feeder inlet of the bulk loader. The second conveyor inlet near one end of the second screw conveyor is sealed to the second discharge connecting pipe of the second auxiliary conveying unit, and the second conveyor outlet near the other end of the second screw conveyor is connected to the secondary conveyor inlet through a secondary connecting pipe.

6. The fly ash transfer system according to claim 1, characterized in that, The spiral conveyor includes a drive motor, and spiral blades are arranged inside the spiral conveying cavity. The drive motor can drive the spiral blades to rotate and transport fly ash. There is a gap between the helical blade and the helical transport cavity, and the gap is 10~15mm.

7. The fly ash transfer system according to claim 1, characterized in that, The feeding screw structure is also connected to an external screw conveyor, which is connected to the chelating system, and a third gate valve is provided at the connection between the external screw conveyor and the chelating system; and / or A second gate valve is also provided between the feeding spiral structure and the airlock structure.

8. The fly ash transfer system according to claim 1, characterized in that, It also includes a dust collection fan connected to the bulk loader, and the suction pipe of the dust collection fan is connected to the periphery of the discharge port of the lifting hose of the bulk loader; Furthermore, the dust collection fan is connected to the dust collector on the top of the ash silo via a dust collection duct.

9. The fly ash transfer system according to claim 1, characterized in that, It also includes an electric heat tracing structure, which is wrapped around the outer periphery of the auxiliary conveying section and the screw conveyor; The outer periphery of the electric heat tracing structure is also bound with a heat insulation layer by galvanized iron wire. The outer surfaces of the auxiliary conveying unit and the screw conveyor are also coated with a modified epoxy anti-corrosion coating.

10. A fly ash workshop, characterized in that, The fly ash transfer system includes any one of claims 1 to 9, wherein a gate is added to the fly ash workshop near the slag pit, and the width of the gate is ≥4m; The fly ash workshop includes a hardened road surface with a thickness of ≥300mm and double-layered steel reinforcement.

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