Ash storage unloading port dust suppression and humidification integrated system

Abstract

This application discloses an integrated dust suppression and humidification system for the ash discharge port of an ash silo. It includes an ash silo, ash discharge equipment, a humidification water storage tank, an inlet pipe, an overflow pipe, and a pressurized water supply component. The ash silo's outlet is connected to the ash discharge equipment's inlet. The ash silo's humidification water header is connected to the inlet pipe. Both the inlet pipe and the overflow pipe are connected to the humidification water storage tank. The inlet of the pressurized water supply component is connected to the outlet of the humidification water storage tank. The system is characterized by further including a sealed dust extraction hood, a negative pressure conveying pipe, a negative pressure fan, and a dust-blocking plate. The outlet of the pressurized water supply component is connected to the humidification inlet of the ash discharge equipment. According to an embodiment of this application, after the modification of the integrated dust suppression and humidification system for the ash discharge port of the No. 1 ash silo twin-shaft mixer, the dust emission concentration at the discharge port can meet the latest environmental protection standards, completely solving the dust problem during ash discharge operations. Simultaneously, it optimizes the operation process, reduces the occupational health risks for on-site operators, and improves the safety and environmental friendliness of the ash removal system.

Description

Technical Field

[0001] This application relates to the technical field of environmental treatment, and in particular to an integrated dust suppression and humidification system for ash silo unloading ports. Background Technology

[0002] Currently, government environmental protection departments are continuously raising their requirements for controlling industrial dust pollution. The ash discharge port of the twin-shaft mixer in the ash silo of the ash removal system of thermal power plants is a high-incidence point for dust and has become a key sensitive item for environmental monitoring.

[0003] Ash silo No. 1 is the core ash storage equipment of our company's ash removal system. It is responsible for the storage, unloading and transfer of fly ash after coal combustion in power plants. It is equipped with a twin-shaft mixer as the dedicated ash unloading host. The mixer is responsible for humidifying and mixing the dry fly ash discharged from the ash silo before unloading and loading it onto trucks.

[0004] The ash discharge port of the twin-shaft mixer in Ash Warehouse No. 1 is not equipped with any dust suppression or collection device. The problem of fugitive dust emission during the ash discharge operation is prominent, which has become a major hidden danger for environmental supervision. The previous humidification water system renovation did not control this dust source. The single humidification method cannot fundamentally solve the dust problem during ash discharge and is difficult to meet the current stringent environmental control requirements. Summary of the Invention

[0005] This application aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, one objective of this application is to provide an integrated dust suppression and humidification system for the ash discharge port of an ash silo, wherein the dust emission concentration at the ash discharge port of the twin-shaft mixer in ash silo No. 1 can meet the requirements of the latest environmental protection standards, completely solving the dust problem during ash discharge operations; at the same time, it optimizes the operation process, reduces the occupational health risks of on-site operators, and improves the safety and environmental friendliness of the ash removal system.

[0007] To achieve the above objectives, the first aspect of this application proposes an integrated dust suppression and humidification system for an ash silo unloading port, comprising an ash silo, an ash unloading device, a humidification water storage tank, an inlet pipe, an overflow pipe, and a pressurized water supply component. The ash silo's outlet is connected to the ash unloading device's inlet, the ash silo's humidification water header is connected to the inlet pipe, the inlet pipe and the overflow pipe are both connected to the humidification water storage tank, and the pressurized water supply component's inlet is connected to the humidification water storage tank's outlet. The system is characterized by further comprising a sealed dust extraction hood, a negative pressure conveying pipe, a negative pressure fan, and a dust-blocking plate. The sealed dust collection hood is a fully enclosed hood with a sealed cavity inside, which is placed over the ash discharge port of the ash discharge equipment. The air inlet of the negative pressure conveying pipe is connected to the sealed cavity of the sealed dust collection hood, and the air outlet of the negative pressure conveying pipe extends into the internal cavity of the humidifying water storage tank. The negative pressure fan is installed in series on the negative pressure delivery pipeline; The dust barrier is fixed in the internal cavity of the humidifying water storage tank, and the dust barrier is located on the airflow path at the outlet of the negative pressure conveying pipeline. The outlet of the pressurized water supply component is used to connect to the humidification inlet of the ash unloading equipment.

[0008] According to an embodiment of this application, an integrated dust suppression and humidification system for the ash discharge port of an ash silo is provided. After the modification, the dust emission concentration at the ash discharge port of the twin-shaft mixer in ash silo No. 1 can meet the latest environmental protection standards, completely solving the dust problem during ash discharge operations. At the same time, the operation process is optimized, reducing the occupational health risks of on-site operators and improving the safety and environmental friendliness of the ash removal system.

[0009] In addition, the integrated dust suppression and humidification system for the ash silo unloading port proposed in this application may also have the following additional technical features: In one embodiment of this application, the ash unloading device is a twin-shaft mixer. The discharge square tube of the twin-shaft mixer extends in the discharge direction. The sealed dust suction hood is extended along the extension direction of the discharge square tube. The sealed cavity encloses the extension section of the discharge square tube and the ash unloading port.

[0010] In one embodiment of this application, the negative pressure delivery pipeline includes two branch pipes and one negative pressure main pipe. The air inlet end of each branch pipe is connected to the sealed cavity of the sealed dust collection hood, and the air outlet end of each branch pipe is connected to the negative pressure main pipe. The negative pressure fan is connected in series on the negative pressure main pipe, and the air outlet end of the negative pressure main pipe extends into the internal cavity of the humidifying water storage tank.

[0011] In one embodiment of this application, the dust-blocking plate is a plurality of parallel baffles, which together form a dust-blocking plate area, and the dust-blocking plate area covers the air outlet of the negative pressure conveying pipeline.

[0012] In one embodiment of this application, the negative pressure fan is a variable frequency fan, and the control terminal of the negative pressure fan is electrically connected to the control terminal of the pressurized water supply component to form a control connection structure for linkage start and stop.

[0013] In one embodiment of this application, a water level self-control valve group is installed in series on the water inlet pipe. The water level self-control valve group includes a gate valve and a float valve. The sensing end of the float valve is located in the internal cavity of the humidification water storage tank.

[0014] In one embodiment of this application, the pressurized water supply assembly includes a pipeline pump and a control valve group. The inlet of the pipeline pump is connected to the outlet of the humidification water storage tank, and the outlet of the pipeline pump is connected to the inlet of the control valve group through a pipeline. The outlet of the control valve group is connected to the humidification inlet of the ash unloading equipment.

[0015] In one embodiment of this application, the air outlet of the negative pressure conveying pipe extends into the internal cavity of the humidifying water storage tank and is located on the air inlet side of the dust-blocking plate area, with the air outlet direction facing the surface of the dust-blocking plate area.

[0016] In one embodiment of this application, the inlet end of the overflow pipe is connected to the upper cavity of the humidifying water storage tank, the outlet end of the overflow pipe extends to the outside of the humidifying water storage tank, and the height of the inlet end of the overflow pipe is higher than the height of the outlet end of the inlet pipe.

[0017] In one embodiment of this application, one end of the sealed dust hood is fixedly and sealed to the body of the twin-shaft mixer, the other end of the sealed dust hood is provided with an opening for material to pass through, and the sealed cavity is connected to the discharge chamber of the twin-shaft mixer.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of an integrated dust suppression and humidification system for an ash silo unloading port according to an embodiment of this application; Figure 2 This is a system block diagram of an integrated dust suppression and humidification system for an ash silo unloading port according to another embodiment of this application; Figure 3 This is a logic block diagram of an integrated dust suppression and humidification system for an ash silo unloading port according to another embodiment of this application. Detailed Implementation

[0020] Embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. Rather, embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0021] The following is in conjunction with the appendix Figures 1-3 This application describes an integrated dust suppression and humidification system for an ash silo unloading port, according to an embodiment of the present application.

[0022] This application provides an integrated dust suppression and humidification system for an ash silo unloading port, comprising an ash silo, an ash unloading device, a humidification water storage tank, an inlet pipe, an overflow pipe, and a pressurized water supply component. The ash silo's outlet is connected to the ash unloading device's inlet, the ash silo's humidification water header is connected to the inlet pipe, the inlet pipe and the overflow pipe are both connected to the humidification water storage tank, and the pressurized water supply component's inlet is connected to the humidification water storage tank's outlet. The system is characterized by further including a sealed dust extraction hood, a negative pressure conveying pipe, a negative pressure fan, and a dust-blocking plate. The sealed dust collection hood is a fully enclosed hood with a sealed cavity inside, which is placed over the ash discharge port of the ash discharge equipment. The air inlet of the negative pressure conveying pipe is connected to the sealed cavity of the sealed dust collection hood, and the air outlet of the negative pressure conveying pipe extends into the internal cavity of the humidifying water storage tank. The negative pressure fan is installed in series on the negative pressure delivery pipeline; The dust barrier is fixed in the internal cavity of the humidifying water storage tank, and the dust barrier is located on the airflow path at the outlet of the negative pressure conveying pipeline. The outlet of the pressurized water supply component is used to connect to the humidification inlet of the ash unloading equipment; Specifically, the connection structure between the negative pressure conveying pipeline, negative pressure fan, dustproof plate and humidifying water storage tank does not change the original pipeline layout of the water inlet pipeline, overflow pipeline and pressurized water supply components.

[0023] During the on-site renovation and construction phase, no dismantling, relocation, addition, or subtraction was made to the existing, operationally proven, and mature water inlet pipes, overflow pipes, and pressurized water supply components. The original layout of these pipelines, including their routing, connections, valve configurations, and installation positions, was 100% preserved. Only two non-destructive adaptation modifications were made to the core 5m³ humidification water storage tank: first, a docking interface matching the negative pressure delivery pipeline was opened on the side wall of the tank; second, a dustproof plate was fixedly installed in the internal cavity of the tank at the position corresponding to the negative pressure pipeline outlet. No part of the original pipeline was touched during the entire process, and there was no need to shut down and drain the original humidification water system.

[0024] The newly added negative pressure delivery pipeline, variable frequency negative pressure dust extraction fan, and dust barrier are all independently installed. They are connected to the water storage tank only through the reserved interface on the side wall of the water tank. Throughout the process, there is no connection, intersection, or alteration with the original water inlet pipeline, overflow pipeline, or pressurized water supply components. This achieves seamless integration between the new equipment and the original mature system. It not only relies entirely on the existing facilities to reduce the cost of renovation and shorten the construction period, but also fundamentally ensures that the operational stability of the original humidification water system is not affected by the renovation.

[0025] In the daily ash unloading operations after the system is officially put into operation, the start and stop operations of the negative pressure fan can be completed simultaneously on the basis of the original process.

[0026] During the pre-start stage of the operation, the operator completely follows the original standardized operation. First, open the DN100 pneumatic butterfly valve of the double-shaft mixer, and then start the pipeline pump of the pressurized water supply component to establish a stable humidification water supply pressure in the original pipeline. This operation is exactly the same as the mature process before the transformation. At the same time, start the variable-frequency negative-pressure dust suction fan to form a stable negative pressure in the negative-pressure conveying pipeline and the airtight dust suction hood. The start-up of the new equipment does not interfere with the water supply state and operation logic of the original pipeline.

[0027] During the ash discharging operation, the float valve on the original water inlet pipeline continuously and automatically controls the water level of the water storage tank, and the overflow pipeline ensures the safety of the water level in the tank. The pressurized water supply component continuously provides stable humidification water for the double-shaft mixer through the original pipeline.

[0028] The newly added negative-pressure dust suction system independently completes the collection and treatment of dust - the dust escaping from the ash discharging port of the double-shaft mixer is captured by the fully enclosed airtight dust suction hood, sent into the water storage tank through the negative-pressure conveying pipeline, naturally settles into the water body of the tank after being physically blocked by the dust blocking plate, and the dust-containing water body is sent into the double-shaft mixer along the original pressurized water supply pipeline, fully mixed with the dry ash to achieve dust recycling and reuse. The water supply pressure and flow rate of the original pipeline are not affected at all during the whole process, and there will be no problems of pressure fluctuation and unstable water supply due to pipeline modification, forming a synergistic dust suppression effect of "dust suction recovery + in-situ humidification" with the negative-pressure dust suction system; after the ash discharging operation is completed, the operator also follows the original reverse shutdown process, first stops the ash discharging operation of the double-shaft mixer, then sequentially shuts down the pipeline pump and closes the pneumatic butterfly valve, and synchronously shuts down the negative-pressure fan, without adjusting the original operation sequence, greatly reducing the personnel training cost and the risk of misoperation.

[0029] Note: Figure 1 The double-dotted line part is the original equipment and pipeline on site, and the solid line part is the newly added equipment and valves.

[0030] In an embodiment of the present application, the ash discharging equipment is a double-shaft mixer. The discharge square pipe of the double-shaft mixer extends in the discharging direction, the airtight dust suction hood is arranged to be lengthened along the extension direction of the discharge square pipe, and the airtight cavity wraps the extended section of the discharge square pipe and the ash discharging port.

[0031] The application scenario of this embodiment is a double-shaft mixer supporting the No. 1 ash silo of the ash removal system in a power plant. This equipment is the core ash discharging operation main machine that was originally on site and has been put into use and solidified, and it is also the only dust generation source to be treated in this transformation. Before the transformation, this double-shaft mixer承担着灰库干粉煤灰加湿搅拌、卸灰装车的核心功能,但卸灰口未配备任何抑尘收尘装置,干灰经加湿搅拌后从卸灰口排出、下落装车的过程中,因物料冲击产生的大量粉尘直接无组织逸散,已成为当地环保部门重点监控的敏感项。

[0032] Before the modification, the original discharge square tube of the twin-shaft mixer was extremely short, and the ash discharge port was close to the mixer body, which posed two major unsolvable problems: First, the vertical drop between the ash discharge port and the loading port was large, resulting in a strong impact airflow when the material was discharged, and a large initial kinetic energy of dust dispersion, which could not be effectively captured by conventional dust collection methods; Second, the extremely short discharge square tube could not provide sufficient installation and sealing space for the dust collection hood. If the dust collection hood was directly installed at the original short discharge port, problems such as interference between the hood and the mixer body, poor sealing, and insufficient coverage of the dust collection area would occur, making it impossible to form an effective negative pressure dust collection environment.

[0033] In this embodiment, the discharge square tube is extended in the discharge direction (the optimal length for on-site implementation is 500mm). On the one hand, this extends the material's falling transition section, buffering the impact airflow when the material is discharged, and reducing the kinetic energy of dust dispersion from the source. On the other hand, it provides sufficient space for the installation, sealing, and negative pressure formation of the sealed dust collection hood, avoiding interference between the hood and the mixer body and loading equipment, thus creating the basic conditions for sealed dust collection.

[0034] In one embodiment of this application, the negative pressure delivery pipeline includes two branch pipes and one negative pressure main pipe. The air inlet end of each branch pipe is connected to the sealed cavity of the sealed dust collection hood, and the air outlet end of each branch pipe is connected to the negative pressure main pipe. The negative pressure fan is connected in series on the negative pressure main pipe, and the air outlet end of the negative pressure main pipe extends into the internal cavity of the humidifying water storage tank.

[0035] Specifically, in actual ash unloading operations, the negative pressure dust collection system works in conjunction with the negative pressure fan and the sealed dust collection hood to complete the entire process of collecting and sealing the dust-laden airflow. The specific operation process is described below in conjunction with the actual on-site working conditions: Negative pressure pre-establishment stage: Before ash unloading, start the negative pressure fan connected in series on the negative pressure main pipe. The operation of the fan creates a stable negative pressure in the negative pressure main pipe. This negative pressure is synchronously transmitted to the two branch pipes connected to the main pipe, and finally creates a uniform negative pressure field in the sealed dust collection hood cavity connected to the air inlet end of the branch pipe, thus preparing the negative pressure power for subsequent dust collection.

[0036] Dust-laden airflow dispersion and collection stage: During the ash unloading operation, the dust-laden airflow generated by the ash unloading port of the twin-shaft mixer is confined within the cavity by the sealed dust collection hood that completely surrounds the ash unloading port. Under the action of negative pressure inside the cavity, the dust-laden airflow at different positions inside the cavity enters the air inlet of the two branch pipes respectively. The design of the dual branch pipes can evenly absorb the dust-laden airflow in the dust collection hood, avoiding the problem of insufficient local negative pressure inside the hood and the inability to effectively capture some dust caused by single-pipe collection, ensuring that there are no dead corners in the dust collection inside the dust collection hood.

[0037] Airflow aggregation and stable delivery stage: After the dust-laden airflow in the two branch pipes is transported through the pipeline, it is uniformly aggregated into the negative pressure main pipe. In the actual on-site configuration, the diameter of the branch pipe is smaller than that of the main pipe. A larger diameter of the main pipe can reasonably reduce the delivery velocity of the dust-laden airflow, which can prevent dust from impacting and accumulating in the pipeline due to excessive flow velocity, and also avoid dust settling and clogging in the pipeline due to excessively slow flow velocity. At the same time, the negative pressure fan continuously provides negative pressure power to drive the dust-laden airflow in the main pipe to maintain a stable and continuous delivery state, ensuring the smoothness of the entire pipeline delivery process.

[0038] In the closed-loop transport stage to the water storage tank: Under the continuous drive of the negative pressure fan, the dust-laden airflow in the main pipe completes a fully closed-loop transport along the pipeline, and finally extends directly into the internal cavity of the humidifying water storage tank through the outlet of the negative pressure main pipe. This precisely transports the dust-laden airflow to the corresponding position in the dust-blocking plate area inside the water tank, preparing for the subsequent physical barrier, sedimentation, and mixing with the humidifying water for reuse. Throughout the entire operation, the dust-laden airflow always flows within the closed branch pipes and negative pressure main pipe, with no dust escaping. Moreover, the pipeline structure seamlessly connects with the existing humidifying water storage tank on site, without requiring any changes to the original pipeline layout. Only through the cooperation of its own branch pipes and main pipe, it achieves a highly efficient closed loop from dust collection to transport, ensuring the cleanliness of the on-site ash unloading operation.

[0039] In one embodiment of this application, the dust-blocking plate is a plurality of parallel baffles, which together form a dust-blocking plate area, and the dust-blocking plate area covers the air outlet of the negative pressure conveying pipeline.

[0040] Specifically, in actual ash unloading operations, this dust-blocking plate structure helps dust settle and prevents secondary dust generation. It works in conjunction with the negative pressure conveying system. In the specific process, after the dust-laden airflow is sent from the outlet to the humidifying water storage tank through the negative pressure header, it first impacts the dust-blocking plate area covering the outlet. Because the dust-blocking plate area is composed of multiple parallel baffles, the dust-laden airflow is blocked by the baffles multiple times and forced to change its flow direction. The dust in the airflow cannot continue to move with the airflow due to inertia and will naturally settle into the humidifying water in the storage tank.

[0041] The airflow, after being blocked by dust, is dispersed and discharged through the gaps between the baffles, without carrying dust away, thus preventing secondary dust generation in the water tank from the source. After the settled dust is fully mixed with the humidifying water in the water tank, it is subsequently transported to the twin-shaft mixer along with the water flow of the original pressurized water supply components, realizing the recycling and reuse of dust. The entire process does not affect the normal operation of the original water replenishment, overflow and humidifying water supply of the water tank.

[0042] In one embodiment of this application, the negative pressure fan is a variable frequency fan, and the control terminal of the negative pressure fan is electrically connected to the control terminal of the pressurized water supply component to form a control connection structure for linkage start and stop.

[0043] Specifically, during the actual ash unloading operation, the control connection structure of this linkage start-stop system enables the synchronous operation of the variable frequency negative pressure fan and the pressurized water supply component, eliminating the need to operate the two devices separately and conforming to the original ash unloading operation process on site.

[0044] Before the ash unloading operation, when the operator starts the pressurized water supply component according to the original procedure, the variable frequency fan will start synchronously due to the linkage of the electrical connection at the control end. After the fan starts, the air volume and air pressure can be dynamically adjusted according to the dust situation on site, and a stable negative pressure can be established in advance in the dust collection hood and conveying pipeline to prepare for dust collection. There is no need to add a separate start-up step for the fan.

[0045] During the ash unloading operation, the variable frequency fan and the pressurized water supply component operate synchronously. The pressurized water supply component continuously delivers stable and humidified water to the ash unloading equipment, while the variable frequency fan automatically adjusts its operating parameters according to the actual amount of dust generated during ash unloading to ensure dust collection efficiency. The two work together to achieve a dual dust suppression effect of dust collection and in-situ humidification.

[0046] After the ash unloading operation is completed, the operator shuts down the pressurized water supply component and the variable frequency fan will also shut down simultaneously. The entire shutdown process can be completed by reversing the original operation sequence. This simplifies the on-site operation steps, avoids omissions caused by individual operation, reduces energy waste from equipment idling, and prevents secondary dust problems caused by only shutting down the water supply and the fan continuing to suck up dust.

[0047] The following points need to be explained regarding the vacuum cleaner fan: 1. Matching of total fan pressure and calculated resistance.

[0048] The variable frequency negative pressure vacuum cleaner fan configured in this project has a total pressure range of 2300~4150Pa, while the calculated total duct resistance (142.48Pa for 10000m³ / h airflow and 890.65Pa for 25000m³ / h airflow) is far below the lower limit of the fan's total pressure. From the perspective of duct resistance alone, the fan's total pressure has sufficient margin to cover the basic resistance requirements.

[0049] 2. Additional resistance needs to be added before verification.

[0050] The above calculations only include the friction resistance of the main pipe and the local resistance of the bends, and do not take into account the resistance of the branch pipes, the local resistance of the dust hood, the resistance of the water tank dust baffle, the additional resistance of dust, or the airflow loss caused by system leakage. If these resistances are added, the total system resistance will increase significantly (the total resistance is expected to reach 1000~1500Pa). At this point, the fan still has sufficient total pressure margin to cope with the situation, but a 20%~30% pressure head margin should be reserved to avoid a decrease in dust collection efficiency due to the increase in system resistance later.

[0051] 3. The adaptability advantages of variable frequency fans.

[0052] The fan is designed with variable frequency, which can dynamically adjust the air volume and air pressure according to the amount of dust discharged: the frequency is lowered under low dust conditions to reduce air volume and energy consumption; the frequency is increased under high dust conditions to increase negative pressure suction, ensuring the dust suppression effect under different conditions.

[0053] In one embodiment of this application, a water level self-control valve group is installed in series on the water inlet pipe. The water level self-control valve group includes a gate valve and a float valve. The sensing end of the float valve is located in the internal cavity of the humidification water storage tank.

[0054] Throughout the actual ash unloading operation, the automatic water level control valve group maintains a stable water level in the humidification water storage tank, ensuring the system's water supply and the water source needs for dust settling.

[0055] During normal use, the gate valve on the inlet pipe remains open. The manual master control and maintenance valve, which serves as the water replenishment path, is only closed when the water tank or valve group is under maintenance, cutting off the water replenishment path from the ash silo humidification water header to the water tank.

[0056] The sensing end of the float valve automatically opens and closes in response to changes in the water level in the water tank. When the water level in the water tank drops due to the consumption of humidification water and dust, the float valve falls synchronously with the water level and opens automatically, and the water inlet pipe then replenishes water to the water tank.

[0057] When the water level in the tank rises to the set height, the float valve rises with the water level and automatically closes, cutting off the water supply path and realizing automatic control of the water level in the tank.

[0058] The entire process requires no real-time manual adjustment and can continuously maintain the water level in the tank within a reasonable range, providing a sufficient and stable water source for the pressurized water supply components to provide stable pressure and for dust to settle smoothly in the tank. At the same time, in conjunction with the overflow pipe, it forms a double guarantee for the water level in the tank, avoiding situations such as water shortage or water overflow due to excessive water level.

[0059] In one embodiment of this application, the pressurized water supply assembly includes a pipeline pump and a control valve group. The inlet of the pipeline pump is connected to the outlet of the humidification water storage tank, and the outlet of the pipeline pump is connected to the inlet of the control valve group through a pipeline. The outlet of the control valve group is connected to the humidification inlet of the ash unloading equipment.

[0060] Specifically, the pressurized water supply component is the core unit that delivers pressurized and humidified water to the ash unloading equipment. It operates continuously based on the layout of the original humidification water system, and the various components work together to achieve a stable water supply.

[0061] Before the ash unloading operation, the operator first opens the control valve group and then starts the pipeline pump. The inlet of the pipeline pump draws water from the humidification water storage tank. After being pressurized by the pump body, the water is transported to the control valve group through the pipeline. Then, the water is smoothly transported from the outlet of the control valve group to the humidification inlet of the ash unloading equipment, thus establishing a stable humidification water supply pressure in advance for the ash unloading operation.

[0062] During the ash unloading operation, the pipeline pump runs continuously, supplying pressure-stabilized humidifying water to the ash unloading equipment without interruption. After being fully mixed with the dust recovered into the water tank by the negative pressure system, the water is sent into the ash unloading equipment together, realizing the combination of humidification and dust suppression and dust reuse. The control valve group maintains the on / off of the pipeline water supply and the pressure stability, ensuring smooth delivery of humidifying water and meeting the water demand of the ash unloading operation.

[0063] After the ash unloading operation is completed, the operators shut down the pipeline pump in reverse order, then close the control valve group to cut off the humidification water delivery path, so as to avoid problems such as abnormal pressure and water hammer in the pipeline. The entire process follows the standardized operating procedures of the original humidification water system on site.

[0064] In one embodiment of this application, the air outlet of the negative pressure conveying pipe extends into the internal cavity of the humidifying water storage tank and is located on the air inlet side of the dust-blocking plate area, with the air outlet direction facing the surface of the dust-blocking plate area.

[0065] Specifically, in actual ash unloading operations, the negative pressure conveying pipeline outlet is designed to ensure efficient dust settling and prevent secondary dust generation.

[0066] The process is as follows: Dust-laden airflow is conveyed through a closed negative pressure main pipe and then directly enters the internal cavity of the humidifying water storage tank from the outlet. Because the outlet is precisely located on the inlet side of the dust-blocking plate area, and the outlet direction is directly facing the surface of the dust-blocking plate area, the dust-laden airflow directly impacts the dust-blocking plate area composed of multiple baffles. Due to inertia, the dust in the airflow cannot continue forward with the airflow and quickly collides with the plate surface before settling into the humidifying water in the tank. The airflow, after being blocked by the dust-blocking plate area, disperses out through the gaps between the baffles. At this point, the airflow no longer contains a large amount of dust, preventing secondary dust generation in the tank. The settled dust mixes thoroughly with the humidifying water in the tank and can subsequently be transported to the ash removal equipment along with the water flow from the pressurized water supply component to participate in humidification operations, achieving dust recovery and reuse. The entire process does not affect the normal operation of other components within the storage tank.

[0067] In one embodiment of this application, the inlet end of the overflow pipe is connected to the upper cavity of the humidifying water storage tank, the outlet end of the overflow pipe extends to the outside of the humidifying water storage tank, and the height of the inlet end of the overflow pipe is higher than the height of the outlet end of the inlet pipe.

[0068] Specifically, the overflow pipe serves as a water level safety guarantee component for the humidification water storage tank, and operates in conjunction with the inlet pipe and the water level automatic control valve group.

[0069] During normal operation, the inlet of the overflow pipe is located in the upper cavity of the water storage tank and is higher than the outlet of the inlet pipe. This will not affect the normal water replenishment from the inlet pipe to the water tank. The water level in the tank is automatically controlled within a reasonable range by the float valve on the inlet pipe. At this time, the overflow pipe does not drain water.

[0070] When a sudden situation such as a malfunction of the float valve or abnormal water replenishment causes the water level in the tank to rise continuously until it exceeds the inlet of the overflow pipe, the excess water will enter the overflow pipe from the inlet and be discharged directly to the outside of the water tank through the outlet. This prevents the water level in the tank from becoming too high and causing overflow, and prevents water from flooding into components such as the negative pressure conveying pipe and dustproof plate area, which would affect the normal operation of the system. This provides a safety protection for the water level in the tank.

[0071] In one embodiment of this application, one end of the sealed dust hood is fixedly and sealed to the body of the twin-shaft mixer, the other end of the sealed dust hood is provided with an opening for material to pass through, and the sealed cavity is connected to the discharge chamber of the twin-shaft mixer.

[0072] Specifically, the sealed cavity that connects the dust hood to the discharge chamber of the mixer can collect all the dust generated when the material is discharged from the mixer into the cavity, allowing the dust to be effectively collected under negative pressure, without any dead corners where dust can leak out; while the material passage reserved at the other end of the dust hood allows the material that has been humidified by the mixer to be smoothly discharged from the cavity, completing the subsequent loading operation without hindering the normal unloading material transportation process.

[0073] In actual operation, the dust suppression and humidification integrated system at the ash silo unloading port of this application: I. On-site renovation and construction phase.

[0074] The entire renovation process preserves the original pipeline routing, connection relationships, valve configuration, and installation positions of the existing water inlet pipes, overflow pipes, and pressurized water supply components, without any dismantling, relocation, or additions / subtractions. Only the core 5m³ humidification water storage tank undergoes two non-destructive adaptation modifications: a docking interface matching the negative pressure delivery pipeline is opened on the side wall of the tank, and a dustproof plate is fixedly installed inside the tank at the position corresponding to the negative pressure pipeline outlet. The entire process does not touch the original pipeline components and does not require the shutdown and emptying of the original humidification water system.

[0075] The newly added sealed dust collection hood, negative pressure delivery pipeline, variable frequency negative pressure fan, and dust barrier are all independently installed. They are connected to the water storage tank only through the reserved interface on the side wall of the water storage tank. They do not have any connection, intersection, or alteration with the original water inlet, overflow, or pressurized water supply pipelines, thus achieving seamless integration with the original mature system. While reducing the cost of renovation and shortening the construction period, the system ensures that the operational stability of the original humidification water system is not affected from the source.

[0076] II. Routine Ash Unloading Operation Phase.

[0077] After the system is put into operation, operators do not need to change their original ash unloading operation habits. They only need to start and stop the negative pressure fan simultaneously based on the original process. The whole process is divided into three stages: pre-start of operation, normal ash unloading operation, and operation shutdown. The original system and the new equipment operate in coordination without interference or fluctuation. (a) Pre-start of the operation.

[0078] The operators followed the existing standardized operating procedures, first opening the DN100 pneumatic butterfly valve of the twin-shaft mixer, and then starting the pipeline pump of the pressurized water supply component to establish a stable humidification water supply pressure in the original pipeline. Because the control terminal of the variable frequency negative pressure fan is electrically connected to the control terminal of the pressurized water supply component to form a linkage start-stop structure, the fan starts synchronously with the pressurized water supply component. After running, it quickly forms a uniform and stable negative pressure field in the negative pressure delivery pipeline and the sealed dust collection hood, preparing for dust collection. The entire startup process does not interfere with the water supply status and operating logic of the original pipeline.

[0079] (ii) Normal ash unloading operation.

[0080] This stage is the core operation of the system. The original humidification water system and the newly added negative pressure dust collection and suppression system operate independently yet work together to achieve a dual dust suppression effect of "dust collection and recovery + in-situ humidification". The existing humidification water system continues to operate stably: the water level control valve group on the inlet pipe maintains a stable water level in the storage tank; the gate valve remains open as a manual master control and maintenance valve for water replenishment; the float valve's sensing end automatically opens and closes in conjunction with the water level in the tank, automatically replenishing water when the water level drops and automatically shutting off water when it rises to the set height; the overflow pipe is in standby mode and does not affect normal water replenishment, only playing a role when the water level is abnormal; the pressurized water supply component continuously delivers stable humidification water to the twin-shaft mixer through the existing pipeline to meet the humidification requirements for ash unloading.

[0081] The newly added negative pressure dust collection and suppression system completes the collection, transportation, settling, and reuse of dust: Dust escaping from the ash discharge port of the twin-shaft mixer is completely confined within the cavity by a fully enclosed dust collection hood. Under negative pressure, it is collected and dispersed through two branch pipes (to avoid insufficient local negative pressure), and then converged into the negative pressure main pipe. Under the continuous negative pressure power of the fan, the dust-laden airflow is stably transported within the sealed pipeline. The dust-laden airflow is sent into the water storage tank through the outlet of the negative pressure main pipe. Because the outlet is located on the air inlet side of the dust-blocking plate area and the air outlet direction is directly facing the plate surface, the airflow directly impacts the dust-blocking plate area composed of multiple parallel baffles. Due to inertia, the dust cannot continue to move with the airflow and naturally settles into the humidifying water in the water tank. The airflow with blocked dust is dispersed and discharged through the gaps between the baffles to avoid secondary dust generation in the water tank. After the settled dust is fully mixed with the humidifying water in the water tank, it is sent into the twin-shaft mixer along with the water flow from the pressurized water supply component, realizing dust recycling and reuse.

[0082] Throughout the entire process, the dust-laden airflow remains within a sealed duct, preventing any dust from escaping. The water supply pressure and flow rate of the original pipeline remain stable. The combined effect of dust collection and in-situ humidification solves the problem of unorganized dust dispersion at its source.

[0083] (iii) Operational shutdown.

[0084] The operators followed the original reverse shutdown procedure, first stopping the ash unloading operation of the twin-shaft mixer, then shutting down the pipeline pump of the pressurized water supply component and closing the pneumatic butterfly valve in sequence; the variable frequency negative pressure fan was shut down synchronously with the pressurized water supply component, without the need for additional separate operation steps, which greatly reduced personnel training costs and the risk of misoperation, and the entire ash unloading operation process was completed.

[0085] Overall, the system closely matches the existing equipment layout and operating habits on site during actual use. All components work together smoothly, achieving efficient dust control while maximizing the use of existing facilities, and balancing operational stability, ease of operation, and environmental governance effectiveness.

[0086] In summary, the integrated dust suppression and humidification system at the ash discharge port of the ash silo in this embodiment of the application can meet the latest environmental protection standards for dust emission concentration at the ash discharge port of the No. 1 ash silo twin-shaft mixer, completely solving the dust problem during ash discharge operations; at the same time, it optimizes the operation process, reduces the occupational health risks of on-site operators, and improves the safety and environmental friendliness of the ash removal system.

[0087] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0089] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An integrated dust suppression and humidification system for an ash silo discharge port, comprising an ash silo, ash discharge equipment, a humidification water storage tank, an inlet pipe, an overflow pipe, and a pressurized water supply component, wherein the discharge port of the ash silo is connected to the inlet of the ash discharge equipment, the humidification water main pipe of the ash silo is connected to the inlet pipe, both the inlet pipe and the overflow pipe are connected to the humidification water storage tank, and the inlet of the pressurized water supply component is connected to the outlet of the humidification water storage tank, characterized in that... It also includes a sealed dust collection hood, negative pressure conveying pipeline, negative pressure fan, and dust barrier; The sealed dust collection hood is a fully enclosed hood with a sealed cavity inside, which is placed over the ash discharge port of the ash discharge equipment. The air inlet of the negative pressure conveying pipe is connected to the sealed cavity of the sealed dust collection hood, and the air outlet of the negative pressure conveying pipe extends into the internal cavity of the humidifying water storage tank. The negative pressure fan is installed in series on the negative pressure delivery pipeline; The dust barrier is fixed in the internal cavity of the humidifying water storage tank, and the dust barrier is located on the airflow path at the outlet of the negative pressure conveying pipeline. The outlet of the pressurized water supply component is used to connect to the humidification inlet of the ash unloading equipment.

2. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, The ash unloading equipment is a twin-shaft mixer. The discharge square tube of the twin-shaft mixer extends in the discharge direction. The sealed dust suction hood is extended along the extension direction of the discharge square tube. The sealed cavity encloses the extension section of the discharge square tube and the ash unloading port.

3. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, The negative pressure delivery pipeline includes two branch pipes and one negative pressure main pipe. The air inlet end of each branch pipe is connected to the sealed cavity of the sealed dust collection hood, and the air outlet end of each branch pipe is connected to the negative pressure main pipe. The negative pressure fan is connected in series on the negative pressure main pipe, and the air outlet end of the negative pressure main pipe extends into the internal cavity of the humidification water storage tank.

4. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, The dust-blocking plate consists of multiple parallel baffles, which together form a dust-blocking plate area that covers the air outlet of the negative pressure conveying pipeline.

5. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, The negative pressure fan is a variable frequency fan, and the control terminal of the negative pressure fan is electrically connected to the control terminal of the pressurized water supply component, forming a control connection structure for linkage start and stop.

6. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, A water level self-control valve group is installed in series on the water inlet pipe. The water level self-control valve group includes a gate valve and a float valve. The sensing end of the float valve is located in the internal cavity of the humidification water storage tank.

7. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, The pressurized water supply assembly includes a pipeline pump and a control valve group. The inlet of the pipeline pump is connected to the outlet of the humidification water storage tank. The outlet of the pipeline pump is connected to the inlet of the control valve group through a pipeline. The outlet of the control valve group is connected to the humidification inlet of the ash unloading equipment.

8. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 4, characterized in that, After the air outlet of the negative pressure conveying pipe extends into the internal cavity of the humidifying water storage tank, it is located on the air inlet side of the dust blocking plate area, and the air outlet direction of the air outlet is directly facing the surface of the dust blocking plate area.

9. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 1, characterized in that, The inlet end of the overflow pipe is connected to the upper cavity of the humidifying water storage tank, and the outlet end of the overflow pipe extends to the outside of the humidifying water storage tank. The height of the inlet end of the overflow pipe is higher than the height of the outlet end of the inlet pipe.

10. The integrated dust suppression and humidification system at the ash silo unloading port according to claim 2, characterized in that, One end of the sealed dust collection hood is fixedly and sealed to the body of the twin-shaft mixer, and the other end of the sealed dust collection hood is provided with an opening for material to pass through. The sealed cavity is connected to the discharge chamber of the twin-shaft mixer.

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