A fly ash drying system

Abstract

This invention discloses a fly ash drying system, comprising: a pretreatment device for evaporating fly ash collected by a dust removal device to meet drying conditions; a rotary drying device for crushing the pretreated lumpy fly ash and drying it; a first hot air device for using high-temperature flue gas generated by a boiler as a first heat source to participate in the drying process; a second hot air device for storing a portion of the high-temperature exhaust gas emitted by the dust removal device as a second heat source to participate in the drying process; and an analysis and control device for analyzing the operating parameters of the drying process and controlling the drying action. This invention uses high-temperature flue gas and high-temperature exhaust gas as heat sources for drying, reducing energy consumption; it integrates the drying system with the existing boiler system, reducing the floor space required; it automates the drying process, reducing the difficulty of operation; and it utilizes high-temperature flue gas for drying to remove some of the fly ash contained in the flue gas, increasing ash removal efficiency.

Description

Technical Field

[0001] This invention relates to the field of pulverized coal drying technology, and more specifically to a fly ash drying system. Background Technology

[0002] Fly ash drying is a process of treating fly ash to evaporate and remove moisture, resulting in a dry state. Fly ash is the residue produced during coal combustion and contains a certain proportion of moisture. There are various methods for drying fly ash, the most common being mechanical drying and hot air drying. Mechanical drying involves placing wet fly ash in a ventilated environment and using mechanical force or vibration to gradually dry it. Hot air drying involves passing hot air through the wet fly ash to evaporate its moisture, thus achieving the drying effect. Dried fly ash can be used in many fields, such as cement production, building materials, and road engineering. Dried fly ash has better fluidity and stability, allowing it to better utilize its properties and application value.

[0003] Existing technologies for fly ash drying have the following drawbacks: 1. High energy consumption: Fly ash drying requires a heat source, typically using traditional energy sources such as coal, oil, or natural gas, resulting in significant energy consumption; 2. Large equipment footprint: A complete fly ash drying system often requires a large space, including drying equipment, conveying equipment, and heat source equipment, which limits the planning and utilization of the production site; 3. High operational difficulty: Fly ash drying systems usually require operation and adjustment through a control system, demanding relatively high technical skills from operators, who need certain professional knowledge and experience.

[0004] Therefore, this application provides a fly ash drying system to solve the above-mentioned problems. Summary of the Invention

[0005] To address the above problems, the present invention provides the following technical solution:

[0006] A fly ash drying system, comprising:

[0007] A pretreatment device is used to evaporate the fly ash collected by the dust removal equipment so that the moisture content of the fly ash meets the drying conditions.

[0008] A rotary drying device, connected to the pretreatment device, is used to crush the pretreated lumpy fly ash and dry it.

[0009] The first hot air device is connected to the boiler and the rotary drying device, and is used to transport the high-temperature flue gas generated by the boiler as the first heat source to the rotary drying device for drying.

[0010] The second hot air device is connected to the exhaust end of the dust removal equipment and the rotary drying device. It is used to store part of the high-temperature exhaust gas emitted by the dust removal equipment and to transport the stored high-temperature exhaust gas as a second heat source to the rotary drying device for drying treatment.

[0011] An analysis and control device, connected to the pretreatment device, the rotary drying device, the first hot air device, and the second hot air device, is used to analyze the operating parameters of the drying process and control the crushing action of the rotary drying device and the air supply action of the first and second hot air devices based on the analysis results.

[0012] Preferably, in the above-mentioned fly ash drying system, the pretreatment device includes:

[0013] An ash collection pit, which is connected to the dust removal equipment, is used to collect the fly ash captured by the dust removal equipment;

[0014] An evaporation unit, which is installed in the ash collection tank, is used to initially remove moisture from the fly ash, so that the fly ash reaches the dry conditions;

[0015] An exhaust component, which is connected to the ash collection tank, is used to discharge the steam generated in the ash collection tank due to the evaporation of moisture.

[0016] Preferably, in the above-mentioned fly ash drying system, the rotary drying device includes:

[0017] The cylindrical shell has a ash discharge port on its bottom plate and an exhaust port on its top plate. An ash discharge valve is installed in the ash discharge port, and the exhaust port is connected to the dust removal equipment through an exhaust pipe.

[0018] An arc-shaped baffle, one end of which is fixedly connected to the side wall of the columnar shell, and the other end of which is fixedly connected to the bottom plate of the columnar shell at the edge of the ash discharge port;

[0019] A rotating cylinder is disposed inside the cylindrical shell and runs at the center of the arc-shaped baffle; the bottom of the rotating cylinder tapers to form a corner, and the end of the corner is slidably connected to the ash discharge valve to enable the rotating cylinder to rotate on the ash discharge valve; a plurality of vents are evenly provided on the side wall of the rotating cylinder.

[0020] The drive end is fixedly connected to the inner wall of the top of the columnar housing, and its output end is connected downward to a transmission rod, which extends into the rotating cylinder.

[0021] The ash inlet pipe has one end detachably connected to the top of the rotating drum via an ash inlet valve, and the other end passes through the top plate of the columnar shell and is connected to the ash collection tank. It is used to transport the pre-treated fly ash in the ash collection tank to the rotating drum. During the rotation of the rotating drum, the ash inlet valve is closed, causing the ash inlet pipe to detach from the rotating drum.

[0022] The telescopic wall has a fixed end that is fixedly connected to the transmission rod, and a telescopic end that extends downward to the corner and can engage with the side wall of the rotating cylinder at the corner when it reaches its extension limit. The telescopic wall rotates with the transmission rod and drives the rotating cylinder to rotate when engaged with the side wall of the rotating cylinder. The telescopic wall is driven by a telescopic electric cylinder and forms a conical chamber with the ash discharge valve.

[0023] The cone-shaped protrusion has multiple protrusions corresponding to the vents; the cone-shaped protrusion includes an installation end and a protruding end, the installation end is fixedly connected to the vent, and the protruding end extends toward the center of the rotating cylinder for crushing lumpy fly ash; a guide hole is provided at the center of the protruding end, and the guide hole communicates with the internal cavity of the columnar shell.

[0024] Preferably, in the above-mentioned fly ash drying system, the first hot air device includes:

[0025] A flue gas duct, one end of which is connected to the cylindrical shell and the other end of which is connected to the exhaust end of the boiler, is used to introduce the high-temperature flue gas generated by the boiler into the cylindrical shell as the first heat source for the drying process.

[0026] A flue gas valve, which is connected to the flue gas duct, is used to control the flow of high-temperature flue gas in the flue gas duct.

[0027] Preferably, in the above-mentioned fly ash drying system, the second hot air device includes:

[0028] A heat storage tank, which is connected to the emission end of the dust removal equipment through a gas collection pipe, is used to acquire and store a portion of the high-temperature exhaust gas emitted by the dust removal equipment and retain the temperature of the high-temperature exhaust gas.

[0029] The exhaust pipe has one end connected to the cylindrical shell and the other end connected to the heat storage tank, and is used to introduce the high-temperature exhaust gas stored in the heat storage tank into the cylindrical shell as a second heat source for the drying process.

[0030] An exhaust valve is installed at the exhaust outlet of the heat storage tank to control the flow of high-temperature exhaust gas in the exhaust pipe.

[0031] Preferably, the above-mentioned fly ash drying system further includes a collection box, which is connected to the ash discharge valve and is used to store the dried fly ash.

[0032] Preferably, the above-mentioned fly ash drying system further includes monitoring equipment, which includes a quality monitoring unit, a moisture content monitoring unit, and a heat source monitoring unit.

[0033] The quality monitoring unit is installed on the rotating drum and is used to detect the total mass data of fly ash falling into the rotating drum.

[0034] The moisture content monitoring unit is installed inside the ash inlet pipe and is used to detect the actual moisture content data of the fly ash falling into the rotating drum.

[0035] The heat source monitoring unit is installed in the flue gas duct and the exhaust gas duct respectively, and is used to acquire the flow rate data and temperature data of the high-temperature flue gas and the high-temperature exhaust gas.

[0036] Preferably, in the above-mentioned fly ash drying system, the analysis and control device includes:

[0037] A drying triggering unit, which is disposed in the flue gas duct, is used to generate a start signal when the boiler discharges high-temperature flue gas;

[0038] The start-up unit is connected to the drying trigger unit and electrically connected to the ash inlet valve, the drive end, the telescopic electric cylinder, the flue gas valve, and the tail gas valve. It is used to control the operation of the above components after the drying trigger unit generates a start signal to dry the fly ash.

[0039] After the starting unit detects the start signal generated by the drying trigger unit, it first controls the telescopic electric cylinder to work, engaging the telescopic wall onto the side wall of the rotating drum; then it opens the ash inlet valve, allowing the pre-treated fly ash to enter the rotating drum; after the fly ash enters, it closes the ash inlet valve and removes it from the rotating drum; subsequently, it opens the flue gas valve and the exhaust gas valve, supplying the first heat source and the second heat source to the cylindrical shell; then it controls the drive end to work, driving the rotating drum to rotate; during the rotation of the lumpy fly ash inside the rotating drum, it is broken up by the protruding end of the conical protrusion, while the first heat source and the second heat source enter the rotating drum through the respective air guide holes to contact the fly ash, achieving drying; the gas to be discharged during the drying process is transported to the dust removal equipment through the exhaust pipe, and discharged after being treated by the dust removal equipment;

[0040] The stop unit is electrically connected to the ash inlet valve, the drive end, the telescopic electric cylinder, the flue gas valve, the tail gas valve, and the ash discharge valve. It is used to receive stop signals in real time, control each component to return to its initial state after receiving the stop signal, and open the ash discharge valve to discharge the dried fly ash into the collection box.

[0041] Preferably, in the above-mentioned fly ash drying system, the analysis and control device further includes:

[0042] The training model unit has a preset drying simulation model. By acquiring total mass data, moisture content data, heat source flow rate data and temperature data from historical drying processes, the data are substituted into the drying simulation model for training, generating a drying time model that calculates drying time based on total mass data, moisture content data, heat source flow rate data and temperature data.

[0043] A real-time analysis unit, connected to the training model unit, the drying trigger unit, the quality monitoring unit, the moisture content monitoring unit, and the heat source monitoring unit, is used to acquire the total mass data of fly ash, the moisture content data, and the flow rate and temperature data of the first and second heat sources after the drying trigger unit generates a start command; and to substitute the above data into the trained drying time model to calculate the predicted drying time.

[0044] The instruction issuing unit, which is connected to the real-time analysis unit and the stop unit, is used to obtain the predicted drying time for this drying process and start timing at the beginning of the drying process; when the timing time is equal to the predicted drying time, a stop signal is generated and sent to the stop unit.

[0045] Preferably, in the above-mentioned fly ash drying system, the analysis and control device further includes a control front end, which is connected to the drying trigger unit and the stop unit, and is used to assist personnel in directly triggering start and stop signals.

[0046] As can be seen from the above technical solution, the beneficial effects of this application compared with the prior art are as follows:

[0047] This invention discloses a fly ash drying system, comprising: a pretreatment device for evaporating fly ash collected by a dust removal device to meet drying conditions; a rotary drying device for crushing the pretreated lumpy fly ash and drying it; a first hot air device for using high-temperature flue gas generated by a boiler as a first heat source to participate in the drying process; a second hot air device for storing a portion of the high-temperature exhaust gas emitted by the dust removal device as a second heat source to participate in the drying process; and an analysis and control device for analyzing the operating parameters of the drying process and controlling the drying action. This invention uses high-temperature flue gas and high-temperature exhaust gas as heat sources for drying, reducing energy consumption; it integrates the drying system with the existing boiler system, reducing the floor space required; it automates the drying process, reducing the difficulty of operation; and it utilizes high-temperature flue gas for drying to remove some of the fly ash contained in the flue gas, increasing ash removal efficiency. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0049] Figure 1 This is a system structure diagram of the present invention;

[0050] Figure 2 This is a structural diagram of the rotary drying device of the present invention.

[0051] In the diagram, 1. Boiler; 2. Dust removal equipment; 3. Rotary drying device; 4. Pretreatment device; 5. First hot air device; 6. Second hot air device; 7. Ash collection tank; 8. Columnar shell; 9. Ash discharge valve; 10. Exhaust pipe; 11. Arc-shaped baffle; 12. Rotating cylinder; 13. Drive end; 14. Ash inlet pipe; 15. Ash inlet valve; 16. Telescopic wall; 17. Transmission rod; 18. Conical protrusion; 19. Air guide hole; 20. Flue gas pipe; 21. Flue gas valve; 22. Heat storage tank; 23. Gas collection pipe; 24. Tail gas pipe; 25. Tail gas valve; 26. Collection box. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0054] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] In one embodiment, see Figure 1-2 A fly ash drying system, comprising:

[0057] The pretreatment device 4 is used to evaporate the fly ash collected by the dust removal equipment 2 so that the moisture content of the fly ash meets the drying conditions.

[0058] The rotary drying device 3, which is connected to the pretreatment device 4, is used to crush the pretreated block fly ash and dry it.

[0059] The first hot air device 5 is connected to the boiler 1 and the rotary drying device 3, and is used to transport the high-temperature flue gas generated by the boiler 1 as the first heat source to the rotary drying device 3 for drying.

[0060] The second hot air device 6 is connected to the discharge end of the dust removal equipment 2 and the rotary drying device 3. It is used to store part of the high-temperature exhaust gas emitted by the dust removal equipment 2 and to transport the stored high-temperature exhaust gas as a second heat source to the rotary drying device 3 for drying treatment.

[0061] An analysis and control device is connected to the pretreatment device 4, the rotary drying device 3, the first hot air device 5, and the second hot air device 6. It is used to analyze the operating parameters of the drying process and control the crushing action of the rotary drying device 3 and the air supply action of the first hot air device 5 and the second hot air device 6 based on the analysis results.

[0062] The principle of the above embodiment is as follows: the fly ash collected by the dust removal equipment is evaporated through a pretreatment device to make the moisture content of the fly ash meet the drying conditions. Then, the rotary dryer receives and crushes the pretreated lumpy fly ash, and dries it through a first heat source from a first hot air device and a second heat source from a second hot air device; the analysis and control device analyzes the operating parameters of the drying process, and controls the crushing action of the rotary dryer and the air supply action of the first and second hot air devices according to the analysis results.

[0063] The beneficial effects of the above embodiments are as follows: the pretreatment device evaporates the fly ash to ensure that its moisture content meets the drying conditions, thus ensuring the drying effect; the rotary drying device can crush and dry the pretreated block fly ash, improving drying efficiency and quality; the first hot air device uses the high-temperature flue gas generated by the boiler as the first heat source, saving energy consumption; the second hot air device stores and utilizes part of the high-temperature exhaust gas emitted by the dust removal equipment as the second heat source, further improving energy utilization efficiency; the analysis and control device can analyze the operating parameters of the drying process in real time, and control the action of each component according to the analysis results, ensuring the stability and performance optimization of the drying process.

[0064] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, wherein the pretreatment device 4 includes:

[0065] Ash collection pit 7, which is connected to dust removal equipment 2, is used to collect fly ash captured by dust removal equipment 2;

[0066] An evaporation unit, which is located in the ash collection tank 7, is used to initially remove moisture from the fly ash, so that the fly ash reaches the dry condition.

[0067] An exhaust component, which is connected to the ash collection tank 7, is used to discharge the steam generated in the ash collection tank 7 due to the evaporation of moisture.

[0068] It should be noted that the evaporation principle of the evaporation component is existing technology. Since the dust removal methods of dust removal devices are inconsistent, wet dust removal, wet treatment, dry dust removal and dry treatment are usually used in combination, resulting in inconsistent humidity of the fly ash obtained from dust removal. Therefore, the evaporation component is used to evaporate the moisture of the fly ash, so that it can meet the drying requirements, increase the drying efficiency, and at the same time ensure the stability and smoothness of the drying environment.

[0069] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, wherein the rotary drying device 3 includes:

[0070] The cylindrical shell 8 has a ash discharge port on its bottom plate and an exhaust port on its top plate. The ash discharge port is equipped with an ash discharge valve 9, and the exhaust port is connected to the dust removal equipment 2 through an exhaust pipe 10.

[0071] An arc-shaped baffle 11 has one end fixedly connected to the side wall of the columnar shell 8, and the other end fixedly connected to the bottom plate of the columnar shell 8 at the edge of the ash discharge port.

[0072] The rotating cylinder 12 is located inside the cylindrical shell 8 and runs at the center of the arc-shaped baffle 11. The bottom of the rotating cylinder 12 is tapered to form a corner, and the end of the corner is slidably connected to the ash discharge valve 9 to enable the rotating cylinder 12 to rotate on the ash discharge valve 9. Several vents are evenly provided on the side wall of the rotating cylinder 12.

[0073] The drive end 13 is fixedly connected to the inner wall of the top of the columnar housing 8, and its output end is connected downward to the transmission rod 17, which extends into the rotating cylinder 12.

[0074] The ash inlet pipe 14 has one end detachably connected to the top of the rotating drum 12 via the ash inlet valve 15, and the other end passes through the top plate of the columnar shell 8 and is connected to the ash collection tank 7. It is used to transport the pre-treated fly ash in the ash collection tank 7 to the rotating drum 12. During the rotation of the rotating drum 12, the ash inlet valve 15 is closed, so that the ash inlet pipe 14 is separated from the rotating drum 12.

[0075] The telescopic wall 16 has its fixed end fixedly connected to the transmission rod 17, and its telescopic end extends downward to the corner, and can engage with the side wall of the rotating cylinder 12 at the corner when it reaches its extension limit; the telescopic wall 16 rotates with the transmission rod 17, and drives the rotating cylinder 12 to rotate when engaged with the side wall of the rotating cylinder 12; the telescopic wall 16 is driven by a telescopic electric cylinder and forms a conical chamber with the ash discharge valve 9;

[0076] The cone-shaped protrusion 18 is provided with multiple protrusions corresponding to the vents; the cone-shaped protrusion 18 includes an installation end and a protruding end. The installation end is fixedly connected to the vent, and the protruding end extends toward the center of the rotating cylinder 12 for crushing blocky fly ash; a guide hole 19 is provided at the center of the protruding end, and the guide hole 19 communicates with the internal cavity of the columnar shell 8.

[0077] It should be noted that at the start of drying, the telescopic electric cylinder is first operated to engage the telescopic wall 16 onto the side wall of the rotating drum 12; then the ash inlet valve 15 is opened to allow the pre-treated fly ash to enter the rotating drum 12; after the fly ash enters, the ash inlet valve 15 is closed, causing it to detach from the rotating drum 12; subsequently, the heat source enters and controls the drive end 13 to operate, driving the rotating drum 12 to rotate; during the rotation of the fly ash inside the rotating drum 12, the lumpy fly ash is broken up by the protruding end of the conical protrusion 18, while the heat source enters the rotating drum 12 through various air guide holes 19 to contact the fly ash, achieving drying; during the drying process, it is necessary to discharge... The gas is transported to the dust removal equipment 2 through the exhaust pipe 10 and discharged after being treated by the dust removal equipment 2. In this embodiment, the telescopic wall 16 forms a conical chamber after being snapped together, which can increase the contact area between the fly ash and the heat source in the rotating drum 12 and increase the drying efficiency. During the drying process, a small amount of fly ash escapes from the rotating drum 12 through the air guide hole 19. The arc-shaped baffle 11 can collect it to the bottom of the columnar shell 8 and discharge it with the ash discharge valve 9. During the rotation, the fly ash is scattered on the inner wall of the rotating drum 12 by centrifugal force. The conical protrusions 18 on the inner wall can break the agglomeration of the fly ash, thereby increasing the drying efficiency.

[0078] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, wherein the first hot air device 5 includes:

[0079] The flue gas duct 20 has one end connected to the cylindrical shell 8 and the other end connected to the exhaust end of the boiler 1. It is used to introduce the high-temperature flue gas generated by the boiler 1 into the cylindrical shell 8 as the first heat source for the drying process.

[0080] The flue gas valve 21 is connected to the flue gas duct 20 and is used to control the flow of high-temperature flue gas in the flue gas duct 20.

[0081] It should be noted that the high-temperature flue gas emitted by boiler 1 contains not only high temperature but also fly ash that has not been captured. Since the fly ash to be dried in the rotary dryer 3 is wet, it will capture some of the fly ash in the high-temperature flue gas, thus increasing the dust removal efficiency. At the same time, using high-temperature flue gas as a heat source can reduce energy consumption.

[0082] To further optimize the above technical solution, please refer to Figure 1-2A fly ash drying system, wherein the second hot air device 6 includes:

[0083] The heat storage tank 22 is connected to the emission end of the dust removal equipment 2 through the gas collection pipe 23. It is used to obtain and store part of the high-temperature exhaust gas emitted by the dust removal equipment 2 and retain the temperature of the high-temperature exhaust gas.

[0084] The exhaust pipe 24 is connected at one end to the cylindrical shell 8 and at the other end to the heat storage tank 22. It is used to introduce the high-temperature exhaust gas stored in the heat storage tank 22 into the cylindrical shell 8 as a second heat source for the drying process.

[0085] The exhaust valve 25 is located at the exhaust outlet of the heat storage tank 22 and is used to control the flow of high-temperature exhaust gas in the exhaust pipe 24.

[0086] It should be noted that in some embodiments, in addition to relying on high-temperature flue gas and high-temperature exhaust gas as heat sources, an independent hot air system is also required to ensure the rapid start-up of the drying system; the principle of the heat storage tank 22 is existing technology; the heat storage tank 22 obtains a portion of the high-temperature exhaust gas. This drying system is built on top of the conventional boiler exhaust system, but does not affect the operation of the boiler exhaust system.

[0087] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system further includes a collection box 26, which is connected to an ash discharge valve 9 for storing dried fly ash.

[0088] It should be noted that the collection box 26 ensures that the dried fly ash is collected quickly, thus preventing the fly ash from remaining in the rotary dryer 3 and reducing the drying efficiency.

[0089] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, further comprising monitoring equipment, including a quality monitoring unit, a moisture content monitoring unit, and a heat source monitoring unit;

[0090] The quality monitoring unit is installed on the rotating drum 12 to detect the total mass data of fly ash falling into the rotating drum 12;

[0091] The moisture content monitoring unit is installed inside the ash inlet pipe 14 to detect the actual moisture content data of the fly ash falling into the rotating drum 12;

[0092] The heat source monitoring units are respectively installed in the flue gas duct 20 and the exhaust gas duct 24 to obtain the flow rate and temperature data of the high-temperature flue gas and the high-temperature exhaust gas.

[0093] It should be noted that the monitoring principle of the above-mentioned monitoring equipment is existing technology; this embodiment ensures the stable operation of the drying process by acquiring parameters from various aspects during the drying process.

[0094] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, comprising an analysis and control device including:

[0095] A drying triggering unit is installed inside the flue gas duct 20 and is used to generate a start signal when the boiler 1 discharges high-temperature flue gas.

[0096] The start-up unit is connected to the drying trigger unit and electrically connected to the ash inlet valve 15, drive end 13, telescopic electric cylinder, flue gas valve 21 and tail gas valve 25. It is used to control the operation of the above components after the drying trigger unit generates a start signal to dry the fly ash.

[0097] After the starting unit detects the start signal generated by the drying trigger unit, it first controls the telescopic electric cylinder to work, engaging the telescopic wall 16 onto the side wall of the rotating drum 12; then it opens the ash inlet valve 15, allowing the pre-treated fly ash to enter the rotating drum 12; after the fly ash enters, it closes the ash inlet valve 15, causing it to detach from the rotating drum 12; subsequently, it opens the flue gas valve 21 and the tail gas valve 25, supplying the first heat source and the second heat source to the cylindrical shell 8; then it controls the drive end 13 to work, driving the rotating drum 12 to rotate; during the rotation of the blocky fly ash inside the rotating drum 12, it is broken by the protruding end of the conical protrusion 18, while the first heat source and the second heat source enter the rotating drum 12 through various air guide holes 19 to contact the fly ash, achieving drying; the gas to be discharged during the drying process is transported to the dust removal equipment 2 through the exhaust pipe 10, and discharged after being treated by the dust removal equipment 2.

[0098] The stop unit is electrically connected to the ash inlet valve 15, drive end 13, telescopic electric cylinder, flue gas valve 21, tail gas valve 25 and ash discharge valve 9. It is used to receive stop signals in real time, and after receiving the stop signal, it controls each component to return to the initial state and opens the ash discharge valve 9 to discharge the dried fly ash into the collection box 26.

[0099] It should be noted that the drying operation can begin when the heat source conditions are met, and the start and stop of the drying process can be controlled through the series of monitoring mentioned above.

[0100] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, the analysis and control device further includes:

[0101] The training model unit has a preset drying simulation model. By acquiring total mass data, moisture content data, heat source flow rate data and temperature data from historical drying processes, the data are substituted into the drying simulation model for training, generating a drying time model that calculates drying time based on total mass data, moisture content data, heat source flow rate data and temperature data.

[0102] The real-time analysis unit, connected to the training model unit, drying trigger unit, quality monitoring unit, moisture content monitoring unit, and heat source monitoring unit, is used to acquire the total mass data of fly ash, moisture content data, and flow rate and temperature data of the first and second heat sources after the drying trigger unit generates a start command; the above data are substituted into the trained drying time model to calculate the predicted drying time.

[0103] The instruction issuing unit, which is connected to the real-time analysis unit and the stop unit, is used to obtain the predicted drying time for this drying process and start timing at the beginning of the drying process; when the timing time equals the predicted drying time, a stop signal is generated and sent to the stop unit.

[0104] It should be noted that in some embodiments, a standard moisture content value is set as a prerequisite adjustment for the end of drying. The drying simulation model is optimized through multiple experiments to obtain the time required for fly ash to dry from the initial moisture content to the standard moisture content through heat sources of different temperatures. This embodiment realizes the automatic start and stop of the drying process, reduces the difficulty of operation by using model training, and makes the drying time more in line with actual application conditions.

[0105] To further optimize the above technical solution, please refer to Figure 1-2 A fly ash drying system, the analysis and control device further includes a control front end, which is connected to a drying trigger unit and a stop unit, for assisting personnel in directly triggering start and stop signals.

[0106] It should be noted that this embodiment retains the option of human intervention, allowing for manual intervention in case of abnormalities during the drying process to ensure safe operation of the drying process.

[0107] It should be noted that the system provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the modules or steps in the embodiments of the present invention can be further decomposed or combined. For example, the modules in the above embodiments can be merged into one module, or further divided into multiple sub-modules to complete all or part of the functions described above. The names of the modules and steps involved in the embodiments of the present invention are only for distinguishing the various modules or steps and are not considered as an improper limitation of the present invention.

[0108] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0109] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0110] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims and their equivalents, this invention is also intended to include these modifications and variations in the above description of the disclosed embodiments, enabling those skilled in the art to implement or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fly ash drying system, characterized in that, include: The pretreatment device (4) is used to evaporate the fly ash collected by the dust removal equipment (2) so that the moisture content of the fly ash meets the drying conditions. A rotary drying device (3) is connected to the pretreatment device (4); The rotary drying device (3) includes: The cylindrical shell (8) has a ash discharge port on its bottom plate and an exhaust port on its top plate. The ash discharge port is equipped with an ash discharge valve (9). The exhaust port is connected to the dust removal equipment (2) through an exhaust pipe (10). An arc-shaped baffle (11) is fixedly connected at one end to the side wall of the columnar shell (8) and at the other end to the bottom plate of the columnar shell (8) at the edge of the ash discharge port. A rotating cylinder (12) is disposed inside the cylindrical shell (8) and runs at the center of the arc-shaped baffle (11); the bottom of the rotating cylinder (12) is tapered to form a corner, and the end of the corner is slidably connected to the ash discharge valve (9) to enable the rotating cylinder (12) to rotate on the ash discharge valve (9); a number of vents are evenly provided on the side wall of the rotating cylinder (12); The drive end (13) is fixedly connected to the inner wall of the top of the columnar housing (8), and its output end is connected downward to a transmission rod (17), which extends into the rotating cylinder (12). The ash inlet pipe (14) is detachably connected at one end to the top of the rotating cylinder (12) via an ash inlet valve (15), and at the other end passes through the top plate of the columnar shell (8) and is connected to the ash collection tank (7) to transport the pretreated fly ash in the ash collection tank (7) to the rotating cylinder (12); during the rotation of the rotating cylinder (12), the ash inlet valve (15) closes, causing the ash inlet pipe (14) to detach from the rotating cylinder (12). The telescopic wall (16) has its fixed end fixedly connected to the transmission rod (17), and its telescopic end extends downward to the corner, and can engage with the side wall of the rotating cylinder (12) at the corner when it reaches its extension limit; the telescopic wall (16) rotates with the transmission rod (17), and drives the rotating cylinder (12) to rotate when engaged with the side wall of the rotating cylinder (12); the telescopic wall (16) is driven by a telescopic electric cylinder and forms a conical chamber with the ash discharge valve (9); A conical protrusion (18) is provided with multiple protrusions corresponding to the vent; the conical protrusion (18) includes an installation end and a protruding end, the installation end is fixedly connected to the vent, and the protruding end extends toward the center of the rotating cylinder (12) for crushing blocky fly ash; a guide hole (19) is provided at the center of the protruding end, and the guide hole (19) communicates with the internal cavity of the columnar shell (8); The first hot air device (5) is connected to the boiler (1) and the rotary drying device (3) and is used to transport the high-temperature flue gas generated by the boiler (1) as the first heat source to the rotary drying device (3) for drying. The second hot air device (6) is connected to the discharge end of the dust removal device (2) and the rotary drying device (3) for storing part of the high-temperature exhaust gas discharged by the dust removal device (2) and transporting the stored high-temperature exhaust gas as a second heat source to the rotary drying device (3) for drying treatment. An analysis and control device is connected to the pretreatment device (4), the rotary drying device (3), the first hot air device (5), and the second hot air device (6) to analyze the operating parameters of the drying process and control the crushing action of the rotary drying device (3) and the air supply action of the first hot air device (5) and the second hot air device (6) according to the analysis results.

2. The fly ash drying system according to claim 1, characterized in that, The pretreatment device (4) includes: Ash collection tank (7), which is connected to the dust removal equipment (2) for collecting fly ash captured by the dust removal equipment (2); An evaporation unit is installed in the ash collection tank (7) to initially remove moisture from the fly ash and bring the fly ash to a dry state. An exhaust component, which is connected to the ash collection tank (7), is used to discharge the steam generated in the ash collection tank (7) due to the evaporation of moisture.

3. The fly ash drying system according to claim 2, characterized in that, The first hot air device (5) includes: The flue gas duct (20) is connected at one end to the columnar shell (8) and at the other end to the exhaust end of the boiler (1), and is used to introduce the high-temperature flue gas generated by the boiler (1) into the columnar shell (8) as the first heat source for the drying process. A flue gas valve (21) is connected to the flue gas duct (20) and is used to control the flow of high-temperature flue gas in the flue gas duct (20).

4. The fly ash drying system according to claim 3, characterized in that, The second hot air device (6) includes: A heat storage tank (22) is connected to the discharge end of the dust removal equipment (2) through a gas collection pipe (23) to obtain and store part of the high-temperature exhaust gas discharged by the dust removal equipment (2) and retain the temperature of the high-temperature exhaust gas. The exhaust pipe (24) is connected at one end to the columnar shell (8) and at the other end to the heat storage tank (22), and is used to introduce the high-temperature exhaust gas stored in the heat storage tank (22) into the columnar shell (8) as a second heat source for the drying process. The exhaust valve (25) is located at the exhaust outlet of the heat storage tank (22) and is used to control the flow of high-temperature exhaust gas in the exhaust pipe (24).

5. A fly ash drying system according to claim 4, characterized in that, It also includes a collection box (26), which is connected to the ash discharge valve (9) and is used to store dried fly ash.

6. A fly ash drying system according to claim 5, characterized in that, It also includes monitoring equipment, which includes a quality monitoring unit, a moisture content monitoring unit, and a heat source monitoring unit; The quality monitoring unit is installed on the rotating drum (12) and is used to detect the total mass data of fly ash falling into the rotating drum (12); The moisture content monitoring unit is installed inside the ash inlet pipe (14) and is used to detect the actual moisture content data of the fly ash falling into the rotating drum (12); The heat source monitoring unit is respectively installed in the flue gas pipe (20) and the exhaust gas pipe (24) to obtain the flow rate data and temperature data of high temperature flue gas and high temperature exhaust gas.

7. A fly ash drying system according to claim 6, characterized in that, The analysis and control device includes: A drying triggering unit is installed inside the flue gas duct (20) and is used to generate a start signal when the boiler (1) discharges high-temperature flue gas; The start-up unit is connected to the drying trigger unit and electrically connected to the ash inlet valve (15), the drive end (13), the telescopic electric cylinder, the flue gas valve (21) and the tail gas valve (25). It is used to control the operation of the above components after the drying trigger unit generates a start-up signal to dry the fly ash. After the starting unit detects the starting signal generated by the drying trigger unit, it first controls the telescopic electric cylinder to work, and the telescopic wall (16) is engaged with the side wall of the rotating cylinder (12); then the ash inlet valve (15) is opened to allow the pre-treated fly ash to enter the rotating cylinder (12); after the fly ash enters, the ash inlet valve (15) is closed and it is removed from the rotating cylinder (12); then the flue gas valve (21) and the tail gas valve (25) are opened to deliver the first heat source and the second heat source to the columnar... Inside the housing (8); then control the drive end (13) to work, driving the rotating cylinder (12) to rotate; during the rotation of the blocky fly ash inside the rotating cylinder (12), it is broken by the protruding end of the cone-shaped protrusion (18), and at the same time, the first heat source and the second heat source enter the rotating cylinder (12) through each of the air guide holes (19) to contact the fly ash and achieve drying; the gas that needs to be discharged during the drying process is transported to the dust removal equipment (2) through the exhaust pipe (10), and discharged after being treated by the dust removal equipment (2); The stop unit is electrically connected to the ash inlet valve (15), the drive end (13), the telescopic electric cylinder, the flue gas valve (21), the tail gas valve (25), and the ash discharge valve (9). It is used to receive the stop signal in real time, control each component to return to the initial state after receiving the stop signal, and open the ash discharge valve (9) to discharge the dried fly ash into the collection box (26).

8. A fly ash drying system according to claim 7, characterized in that, The analysis and control device further includes: The training model unit has a preset drying simulation model. By acquiring total mass data, moisture content data, heat source flow rate data and temperature data from historical drying processes, the data are substituted into the drying simulation model for training, generating a drying time model that calculates drying time based on total mass data, moisture content data, heat source flow rate data and temperature data. A real-time analysis unit, connected to the training model unit, the drying trigger unit, the quality monitoring unit, the moisture content monitoring unit, and the heat source monitoring unit, is used to acquire the total mass data of fly ash, the moisture content data, and the flow rate and temperature data of the first and second heat sources after the drying trigger unit generates a start command; and to substitute the above data into the trained drying time model to calculate the predicted drying time. The instruction issuing unit, which is connected to the real-time analysis unit and the stop unit, is used to obtain the predicted drying time for this drying process and start timing at the beginning of the drying process; when the timing time is equal to the predicted drying time, a stop signal is generated and sent to the stop unit.

9. A fly ash drying system according to claim 8, characterized in that, The analysis and control device also includes a control front end, which is connected to the drying trigger unit and the stop unit, and is used to assist personnel in directly triggering start and stop signals.

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