A fly ash storage and transportation integrated system and method

Abstract

The present invention discloses an integrated system and method for storage and transportation of fly ash, including: at least one steel silo, the discharge port of the steel silo is connected to a concrete raw ash bin through a conveying device, the raw ash bin is connected to a sorting device, the sorting device at least includes a raw ash inlet, a fine ash discharge port and a coarse ash discharge port, the raw ash inlet is connected to the raw ash bin, the fine ash discharge port is connected to the fine ash bin; the coarse ash discharge port is connected to the coarse ash bin; the pneumatic conveying pipeline is respectively connected to the steel silo and the concrete ash bin through a switching valve, and unloading equipment is symmetrically arranged at the bottom of each ash bin; the discharge of the unloading equipment can be loaded and transported. The present invention no longer sets up a loading garage for the steel silo separately, but uses three ash bins as loading garages to realize unloading and loading for transportation. Without affecting the function, it can optimize the road setting within the factory, reduce the overall plan layout of the factory area, improve the operating environment within the factory, and reduce investment.

Description

Technical Field

[0001] The present invention relates to the technical field of fly ash storage and transportation, and in particular to a fly ash storage and transportation integrated system and method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] In the prior art, fly ash from most thermal power plants is generally stored in concrete or steel structure ash silos within the plant, which can store the ash discharge of about 24h-60h when the boiler burns the designed coal type under BMCR conditions. In order to extend the storage time of fly ash within the plant, some power plants will add steel silos within the plant, which can generally store the ash discharge of about 1-3 months when the boiler burns the designed coal type under BMCR conditions.

[0004] The configuration of ash silos and steel silos is generally 3 ash silos and 1 or 2 steel silos. The specific operation process is: the pneumatic ash conveying pipeline can transport fly ash to both the ash silo and the steel silo. The ash in the steel silo is transported to a separate loading garage through the bottom discharge device, and then loaded under the loading garage for transportation. This configuration and process have the following main disadvantages:

[0005] (1) In order to transport the fly ash out of the steel silo, a separate loading garage (with a diameter of 5-10m) is required and it needs to be located near the steel silo, which requires a certain amount of land and a road for ash transportation. This loading garage not only affects the overall layout, but also requires additional costs.

[0006] (2) There is usually only one loading garage for loading and unloading fly ash in the steel silo. This can only be used for loading and transporting, and cannot be used to separate coarse and fine ash. In order to separate fly ash, three loading garages need to be set up separately, each of which stores coarse ash or fine ash separately, which occupies a large area and has a high investment cost. Summary of the invention

[0007] In order to solve the above problems, the present invention proposes an integrated system and method for storage and transportation of fly ash, which eliminates the loading garage and uses the original ash garage as the loading garage, thereby reducing the floor space and saving costs.

[0008] According to a first aspect of the present invention, a fly ash storage and transportation integrated system is disclosed, comprising:

[0009] At least one steel silo, the discharge port of the steel silo is connected to the concrete raw ash bin through a conveying device, the raw ash bin is connected to a sorting device, the sorting device at least comprises a raw ash inlet, a fine ash discharge port and a coarse ash discharge port, the raw ash inlet is connected to the raw ash bin, the fine ash discharge port is connected to the fine ash bin; the coarse ash discharge port is connected to the coarse ash bin; the raw ash in the raw ash bin is sorted into fine ash and coarse ash by the sorting device, and sent to the fine ash bin and the coarse ash bin respectively;

[0010] The pneumatic conveying pipeline is connected to the steel silo and concrete ash silo through switching valves. Unloading equipment is symmetrically arranged at the bottom of each ash silo; the discharge of the unloading equipment can be loaded onto trucks for transportation.

[0011] As a further solution, the unloading equipment includes at least two dry unloading equipment and at least two wet unloading equipment symmetrically arranged along the central axis of the ash bin; a level meter corresponding to each unloading equipment is respectively arranged on the top of the ash bin, and the level meter can measure and feedback the height of the dry ash level in the ash bin. When the height difference of the level meters corresponding to each dry unloading equipment exceeds the set threshold, the dry unloading equipment corresponding to the level meter with the lowest height is closed to ensure that the unloading equipment corresponding to the level meter with the highest height is in an open state; it is judged whether the height difference of the level meters corresponding to the remaining dry unloading equipment exceeds the set threshold. If it still exceeds, the dry unloading equipment corresponding to the level meter with the lowest height continues to be closed, and so on, until the height difference of the level meters corresponding to each dry unloading equipment does not exceed the set threshold; when the height difference of the level meters corresponding to each wet unloading equipment exceeds the set threshold, the same control method as the dry unloading equipment is adopted.

[0012] As a further solution, a gasification fan, an electric heater and a negative ion generator are sequentially arranged in the ash bin. The gasification fan and the electric heater provide high-temperature fluidizing air for the ash bin to fluidize the dry ash. The negative ion generator can ionize the high-temperature fluidizing air into negative ions, thereby reducing the adhesion and friction between the dry ash and the inner wall of the steel bin, making it easier for the dry ash to be discharged through the discharge port.

[0013] As a further solution, each ash bin is equipped with a fly ash charge detection device. When it is detected that the dust charge in the ash bin is less than the set value, feedback is given to the negative ion generator, so that the negative ion generator increases the energy output density until the dust charge in the ash bin is greater than or equal to the set value.

[0014] As a further solution, the inner wall of the cone hopper of each ash silo is sprayed with a polymer nano coating.

[0015] As a further solution, the conveying device includes a scraper conveyor and a lifting mechanism.

[0016] As a further solution, the ash in the original ash bin is output from the discharge port, and then sorted by the sorting device and transported to the corresponding fine ash bin or coarse ash bin respectively.

[0017] According to a second aspect of the present invention, a method for integrated storage and transportation of fly ash is disclosed, comprising:

[0018] The fly ash in the pneumatic conveying pipeline is selectively conveyed to the steel silo or concrete ash silo through the switching valve;

[0019] The fly ash discharged from the steel silo is sorted into coarse and fine ash, and the sorted fly ash is sent to the corresponding fine ash bin or coarse ash bin respectively; the fly ash discharged from the original ash bin is sorted and transported to the corresponding fine ash bin or coarse ash bin respectively;

[0020] The output from the raw ash storage, fine ash storage and coarse ash storage is loaded onto trucks for transportation.

[0021] As a further solution, level meters corresponding to each unloading device in the ash bin are respectively arranged on the top of the raw ash bin, the fine ash bin and the coarse ash bin; the dry ash level height of each unloading device in the ash bin is measured and fed back by the level meter in real time; when the height difference of the level meters corresponding to each dry unloading device exceeds the set threshold, the dry unloading device corresponding to the level meter with the lowest height is closed to ensure that the unloading device corresponding to the level meter with the highest height is in an open state; it is judged whether the height difference of the level meters corresponding to the remaining dry unloading devices exceeds the set threshold; if it still exceeds, the dry unloading device corresponding to the level meter with the lowest height continues to be closed, and so on, until the height difference of the level meters corresponding to each dry unloading device does not exceed the set threshold; when the height difference of the level meters corresponding to each wet unloading device exceeds the set threshold, the same control method as that of the dry unloading device is adopted.

[0022] As a further solution, the gasified wind sent to each ash bin is ionized into negative ions by a negative ion generator; the dust charge in each ash bin is detected in real time, and when the dust charge is less than a set value, the negative ion energy output density is increased until the dust charge in the ash bin is equal to or greater than the set value.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention no longer sets up a separate loading garage for the steel silo, but uses three ash silos as loading garages to realize ash unloading and loading for transportation. The ash unloading and loading area under the original garage is optimized and used together with the ash unloading and loading area under the concrete ash silo. Under the premise of not affecting the function, an ash unloading and loading area can be saved, which can not only optimize the road setting within the factory and reduce the overall layout of the factory area, but also improve the operating environment within the factory, facilitate centralized management, and reduce investment.

[0025] (2) The present invention utilizes the fly ash sorting system installed on the concrete ash silo to sort the fly ash in the steel silo into coarse and fine ash, and transports the sorted fly ash to the corresponding ash silo, so that the ash in the ash silo can be directly loaded and transported out. This solves the problem of the prior art that different loading bays need to be set up during sorting, thereby resulting in a large floor space.

[0026] (3) The present invention sets a continuous level meter at the top of the ash bin corresponding to the discharge port at the bottom of the ash bin, and the same type of unloading equipment is installed diagonally symmetrically along the center line of the ash bin. When the dry ash level height fed back by the level meter exceeds the set level difference, alternate unloading is performed to achieve a uniform dry ash level in the ash bin and prevent the ash bin from being overloaded.

[0027] (4) The present invention sets up an anti-blocking system for the steel ash silo, and uses a negative ion generator to ionize the gasified wind sent to each ash silo into negative ions, thereby solving the problem of fly ash in the steel ash silo becoming sticky and difficult to fall due to temperature reduction, ensuring smooth ash falling and achieving safe and stable operation.

[0028] Other features and advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of the structure of the integrated system for storage and transportation of fly ash in an embodiment of the present invention;

[0030] Among them, 1. Pneumatic conveying pipeline, 2. Steel plate silo, 3. Buried scraper conveyor, 4. Lifting mechanism, 5. Distribution device, 6. Raw ash silo, 7. Coarse ash silo, 8. Fine ash silo, 9. Material level meter, 10. Sorting device, 11. Sorting fan. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] Embodiment 1

[0034] In one or more embodiments, a fly ash storage and transportation integrated system is disclosed, comprising: at least one steel silo 2, the discharge port of the steel silo 2 is connected to a concrete raw ash bin 6 through a conveying device, the raw ash bin 6 is connected to a sorting device 10, the sorting device 10 at least comprises a raw ash inlet, a fine ash discharge port and a coarse ash discharge port, the raw ash inlet is connected to the raw ash bin 6, the fine ash discharge port is connected to the fine ash bin 8; the coarse ash discharge port is connected to the coarse ash bin 7; the raw ash in the raw ash bin is sorted into fine ash and coarse ash by the sorting device 10, and are respectively transported to the corresponding fine ash bin 8 and coarse ash bin 7.

[0035] The pneumatic conveying pipeline 1 is connected to the steel silo 2 and the concrete ash silo (raw ash silo 6, coarse ash silo 7, fine ash silo 8) through switching valves. The bottom of each ash silo is symmetrically provided with similar unloading equipment; the discharge of the unloading equipment can be loaded onto trucks for transportation.

[0036] Specifically, combined Figure 1 In this embodiment, two steel silos are arranged, and the discharge port of each steel silo is connected to a conveying device. The conveying device uses an embedded scraper conveyor 3 and a lifting mechanism 4. The bottom discharge of the steel silo uses an embedded scraper conveyor with a larger output (the output can reach 600t / h). Compared with replacing the conventional pipeline transportation method, it can effectively increase the ash guiding speed, reduce the ash guiding time, and improve the fly ash export efficiency, thereby improving the turnover rate of the steel silo.

[0037] This embodiment sets up three ash bins, namely, the original ash bin 6, the fine material bin 8 and the coarse material bin 7; a switching valve is set on the pneumatic conveying pipeline 1, and the fly ash can be transported to the concrete ash bin or to the two steel silos by switching the valve. The fly ash in the steel silo 2 is led out from the steel silo and transported to the top of the ash bin by the buried scraper conveyor 3 set at the bottom and the lifting mechanism 4 connected thereto, and can be transported to any ash bin through the distribution device 5. The connection channel between the distribution device 5 and any ash bin is provided with a valve to control the opening and closing of the channel. After the ash in the original ash bin 6 is output from the discharge port, it can also be transported to the corresponding fine ash bin 8 or coarse ash bin 7 after being sorted by the sorting device 10 and the sorting fan 11.

[0038] In this embodiment, the unloading equipment includes at least two dry unloading equipment and at least two wet unloading equipment symmetrically arranged along the central axis of the ash bin; a level meter 9 corresponding to each unloading device is provided on the top of the ash bin, and the level meter 9 can measure and feedback the dry ash level height in the ash bin.

[0039] When the height difference of the level gauges corresponding to the various dry unloading equipment exceeds the set threshold, the dry unloading equipment corresponding to the level gauge with the lowest height is closed, and the unloading equipment corresponding to the level gauge with the highest height is ensured to be in the open state; determine whether the height difference of the level gauges corresponding to the remaining dry unloading equipment exceeds the set threshold. If it still exceeds, continue to close the dry unloading equipment corresponding to the level gauge with the lowest height, and so on, until the height difference of the level gauges corresponding to the various dry unloading equipment does not exceed the set threshold;

[0040] When the wet unloading equipment is in operation, when the height difference of the material level gauges corresponding to each wet unloading equipment exceeds the set threshold, the same control method as the dry unloading equipment is adopted.

[0041] For example: four unloading devices are set at the bottom of each ash silo, including two dry unloading devices and two wet unloading devices. The dry unloading device can load dry ash into sealed tank trucks for transportation, and the wet unloading device can humidify dry ash and load it into environmentally friendly dump trucks for transportation. In order to prevent the ash silo from being overloaded, a level meter corresponding to the unloading port at the bottom of the ash silo is set on the top of each ash silo, and the two dry unloading devices are installed diagonally and symmetrically along the central axis of the ash silo, and the two wet unloading devices are installed diagonally and symmetrically along the central axis of the ash silo, and the dry ash level height in the ash silo is fed back by the level meter; when the two dry unloading devices are in operation, when the level meters above the two dry unloading devices show that the level height difference exceeds 2m, the dry unloading device corresponding to the level meter with the lower level height is automatically closed, and the dry unloading device corresponding to the level meter with the higher level height is used to unload the ash; finally, the dry ash level in the ash silo is uniform, ensuring the safety of the ash silo structure.

[0042] In this embodiment, in order to solve the problem that the fly ash in the steel ash silo becomes compacted and sticky due to the decrease in temperature, resulting in poor ash falling, an anti-blocking system is set for the steel ash silo. Specifically, a gasification fan, an electric heater and a negative ion generator are sequentially arranged in the ash silo. The gasification fan and the electric heater provide high-temperature fluidizing air for the ash silo to fluidize the dry ash. The negative ion generator can ionize the high-temperature fluidizing air into negative ions, thereby reducing the adhesion and friction between the dry ash and the inner wall of the steel silo, making it easier for the dry ash to be discharged through the discharge port.

[0043] As an optional implementation, a polymer nano coating is sprayed on the inner wall of the ash bin cone to prevent fly ash from sticking to the wall and reduce the friction coefficient of the inner wall of the ash bin. At the same time, a fly ash charge detector is set in the ash bin to adjust the charge of the negative ion generator in real time according to the data of the detector. The negative ion energy density output by the negative ion generator in this embodiment is about 1.5x10 3 W / cm 3 , the pulse width is about 100pps, the operating frequency is about 20K-40KHz, when the fly ash charge detector detects that the dust charge is less than 3c / cm 2The negative ion generator is fed back to increase the negative ion energy output density until the charge detector detects that the dust charge reaches 3c / cm 2 Above this, the negative ion generator will no longer increase power and maintain this state, ultimately achieving the goal of smooth ash fall.

[0044] Embodiment 2

[0045] In one or more embodiments, a method for integrated storage and transportation of fly ash is disclosed, which specifically includes the following process:

[0046] The fly ash in the pneumatic conveying pipeline is selectively transported to the steel silo or concrete ash silo through the switching valve; the discharge of the steel silo is sorted into coarse and fine ash, and the sorted fly ash is respectively sent to the corresponding fine ash silo or coarse ash silo; the fly ash discharge in the original ash silo is sorted and transported to the corresponding fine ash silo or coarse ash silo; the discharge of the original ash silo, fine ash silo and coarse ash silo is loaded and transported out.

[0047] In this embodiment, level meters corresponding to each unloading device in the ash bin are respectively arranged on the top of the raw ash bin, the fine ash bin and the coarse ash bin; the level meters measure and feedback the dry ash level height of each unloading device in the ash bin in real time, and control the operation of the dry unloading device or the wet unloading device according to the level height, so as to finally achieve uniform dry ash level in the ash bin and ensure the safety of the ash bin structure.

[0048] For example: when the height difference of the level meters corresponding to each dry unloading equipment exceeds the set threshold, the dry unloading equipment corresponding to the level meter with the lowest height is closed to ensure that the unloading equipment corresponding to the level meter with the highest height is in the open state; determine whether the height difference of the level meters corresponding to the remaining dry unloading equipment exceeds the set threshold. If it still exceeds, continue to close the dry unloading equipment corresponding to the level meter with the lowest height, and so on, until the height difference of the level meters corresponding to each dry unloading equipment does not exceed the set threshold.

[0049] When the height difference of the material level gauges corresponding to each wet unloading equipment exceeds the set threshold, the same control method as the dry unloading equipment is adopted.

[0050] In this embodiment, the gasified wind sent to each ash bin is ionized into negative ions by a negative ion generator; the dust charge in each ash bin is detected in real time, and when the dust charge is less than a set value, the negative ion energy output density is increased until the dust charge in the ash bin is equal to or greater than the set value.

[0051] The specific implementation of the above process has been described in detail in Example 1 and will not be described in detail here.

[0052] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A fly ash storage and transportation integrated system, characterized in that: include: At least one steel silo, the discharge port of the steel silo is connected to the concrete raw ash silo through a conveying device, the raw ash silo is connected to a sorting device, the sorting device at least comprises a raw ash inlet, a fine ash discharge port and a coarse ash discharge port, the raw ash inlet is connected to the raw ash silo, and the fine ash discharge port is connected to the fine ash silo; The coarse ash discharge port is connected to the coarse ash storage; The raw ash in the raw ash silo is sorted into fine ash and coarse ash by the sorting device and sent to the fine ash silo and coarse ash silo respectively; The pneumatic conveying pipeline is connected to the steel silo and concrete ash silo through switching valves. Unloading equipment is symmetrically set at the bottom of each ash silo. The discharge of the unloading equipment can be loaded and transported. The unloading equipment comprises at least two dry unloading equipment and at least two wet unloading equipment which are symmetrically arranged along the central axis of the ash bin; a level meter corresponding to each unloading equipment is respectively arranged on the top of the ash bin, and the level meter can measure and feedback the height of the dry ash level in the ash bin; when the height difference of the level meters corresponding to each dry unloading equipment exceeds the set threshold value, the dry unloading equipment corresponding to the level meter with the lowest height is closed to ensure that the unloading equipment corresponding to the level meter with the highest height is in an open state; it is judged whether the height difference of the level meters corresponding to the remaining dry unloading equipment exceeds the set threshold value; if it still exceeds, the dry unloading equipment corresponding to the level meter with the lowest height continues to be closed, and so on, until the height difference of the level meters corresponding to each dry unloading equipment does not exceed the set threshold value; when the height difference of the level meters corresponding to each wet unloading equipment exceeds the set threshold value, the same control method as that of the dry unloading equipment is adopted.

2. The integrated system for storage and transportation of fly ash according to claim 1, characterized in that: A gasification fan, an electric heater and a negative ion generator are arranged in the ash bin in sequence. The gasification fan and the electric heater provide high-temperature fluidizing air for the ash bin to fluidize the dry ash. The negative ion generator can ionize the high-temperature fluidizing air into negative ions, thereby reducing the adhesion and friction between the dry ash and the inner wall of the steel bin, making it easier for the dry ash to be discharged through the discharge port.

3. The integrated system for storage and transportation of fly ash according to claim 2, characterized in that: Each ash bin is equipped with a fly ash charge detection device. When it is detected that the dust charge in the ash bin is less than the set value, it is fed back to the negative ion generator, causing the negative ion generator to increase the energy output density until the dust charge in the ash bin is greater than or equal to the set value.

4. The integrated system for storage and transportation of fly ash according to claim 2, characterized in that: The inner wall of the cone hopper of each ash silo is sprayed with polymer nano coating.

5. The integrated system for storage and transportation of fly ash according to claim 1, characterized in that: The conveying device comprises a scraper conveyor and a lifting mechanism.

6. The integrated system for storage and transportation of fly ash according to claim 1, characterized in that: The ash in the original ash bin is output from the discharge port, and then is sorted by the sorting device and transported to the corresponding fine ash bin or coarse ash bin respectively.

7. A fly ash storage and transportation integrated method, using the fly ash storage and transportation integrated system according to any one of claims 1 to 6, characterized in that: include: The fly ash in the pneumatic conveying pipeline is selectively conveyed to the steel silo or concrete ash silo through the switching valve; The fly ash discharged from the steel silo is sorted into coarse and fine ash, and the sorted fly ash is sent to the corresponding fine ash bin or coarse ash bin respectively; the fly ash discharged from the original ash bin is sorted and transported to the corresponding fine ash bin or coarse ash bin respectively; The output from the raw ash storage, fine ash storage and coarse ash storage is loaded onto trucks for transportation.

8. The integrated method for storage and transportation of fly ash according to claim 7, characterized in that: Level meters corresponding to each unloading equipment in the ash bin are respectively arranged on the top of the raw ash bin, fine ash bin and coarse ash bin; the dry ash level height of each unloading equipment in the ash bin is measured and fed back by the level meter in real time; when the height difference of the level meters corresponding to each dry unloading equipment exceeds the set threshold, the dry unloading equipment corresponding to the level meter with the lowest height is closed to ensure that the unloading equipment corresponding to the level meter with the highest height is in the open state; it is judged whether the height difference of the level meters corresponding to the remaining dry unloading equipment exceeds the set threshold; if it still exceeds, the dry unloading equipment corresponding to the level meter with the lowest height continues to be closed, and so on, until the height difference of the level meters corresponding to each dry unloading equipment does not exceed the set threshold; when the height difference of the level meters corresponding to each wet unloading equipment exceeds the set threshold, the same control method as that of the dry unloading equipment is adopted.

9. The integrated method for storage and transportation of fly ash according to claim 7, characterized in that: The gasified wind sent to each ash bin is ionized into negative ions by a negative ion generator; the dust charge in each ash bin is detected in real time. When the dust charge is less than the set value, the negative ion energy output density is increased until the dust charge in the ash bin is equal to or greater than the set value.

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