An environmentally friendly sealed device for coal tower feeding trolley

Abstract

This invention relates to an environmentally friendly sealed device for a coal tower feeding trolley, comprising: an annular sealing assembly, a sealed belt conveyor, and a bag filter dust collection system; the annular sealing assembly includes a sealing cover plate, a frame, running wheels, and a track; the sealed belt conveyor is located on the sealing cover plate; the bag filter dust collection system includes a fan and a bag filter dust collector; the bag filter dust collection system has several dust suction ports. The environmentally friendly sealed device for a coal tower feeding trolley provided by this invention can dynamically set the start / stop and high / low speed times of the dust collection fan, improving the efficiency of the dust collection system. Simultaneously, it controls the negative pressure within the dust collection sealing system according to the coal tower feeding volume and material line fluctuations, achieving full enclosure during the annular feeding of the feeding trolley and minimizing coal dust spillage.

Description

Technical Field

[0001] This invention relates to an environmentally friendly sealed device for a coal tower feeding trolley, belonging to the field of environmental protection equipment technology. Background Technology

[0002] The annular feeding trolley of the coke oven coal tower is installed on the top of the coal tower, such as... Figure 1 As shown, it consists of a slewing trolley, belt conveyor, circular track, control system, etc. Its main function is to evenly distribute the coal powder transported by the upstream belt conveyor inside the coal tower silo.

[0003] Because the circular feeding trolley needs to continuously feed coal into the coal tower's main compartment, the top of the coal tower is generally designed as an open structure with lattice panels, making it difficult to achieve overall rotational sealing. Coal dust enters the coal tower with a drop exceeding 30 meters. Due to the lack of effective sealing of the coal tower and the intermittent impact and swirling positive pressure within the compartment, a large amount of dust overflows from the top of the coal tower, resulting in a poor working environment.

[0004] Since the coal tower is generally more than 50 meters above the ground, and the area around the coke oven is the activity area of ​​the four large carts, and the raw coal itself has a high moisture content, if the dust removal pipe is too long, material will easily accumulate inside the pipe, making it difficult to use conventional ground dust removal stations for centralized flue gas treatment.

[0005] Existing dust control technologies for annular feeding conveyors both domestically and internationally include internal coal tower spray dust suppression technology and single-unit dust collectors installed on the conveyor belt. Spray dust suppression increases the moisture content of raw coal, negatively impacting coke oven production; while single-unit dust collectors installed on the conveyor belt do not fundamentally solve the sealing and positive pressure fluctuation problems during coal tower silo feeding. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technology and provide a sealed device that can effectively prevent dust from being generated when fabric is being processed.

[0007] To solve the above-mentioned technical problems, the technical solution proposed by the present invention is: an environmentally friendly sealed device for a coal tower feeding trolley, comprising: an annular sealing assembly, a sealed belt conveyor, and a bag filter dust collection system;

[0008] The annular sealing assembly includes a sealing cover, a frame, wheels, and a track; the frame supports the sealing cover; the sealing cover and the frame are located at the upper opening of the coal tower and form a sealed space at the upper opening of the coal tower; the wheels are installed at the bottom of the frame and can move along the track, which is annular;

[0009] The sealed belt conveyor is located on the closed cover plate; both ends of the sealed belt conveyor are discharge ports; the discharge ports pass through the closed cover plate; the sealed belt conveyor can rotate about the center of the upper opening of the coal tower as an axis, and as the sealed belt conveyor rotates, the discharge ports at both ends move along circular trajectories with different radii; the inlet of the sealed belt conveyor is connected to the upstream coal blending system belt conveyor.

[0010] The bag filter dust collection system includes a fan and a bag filter dust collector; the bag filter dust collection system has several dust collection ports, which are respectively arranged at the four corners of the upper opening of the coal tower and the inlet of the sealed belt conveyor; the fan provides dust collection power and sends the gas drawn in from the dust collection ports to the bag filter dust collector.

[0011] When the material is laid, the fan of the bag dust collection system starts and maintains a minimum speed. When the material arrives at the material trolley, the fan speed increases.

[0012] When the amount of fabric fluctuates, let the negative pressure generated by the fan be P. Then the formula between P, the material flow rate M, and the material level fluctuation value Δh per unit time is P = P L *(1+η*M / M H +β*Δh / H H ), where P L The negative pressure generated when the fan is at its lowest speed; M H H represents the maximum material flow rate. H η is the highest material level in the coal tower, η is the negative pressure adjustment coefficient, and β is the material level fluctuation adjustment coefficient.

[0013] A further improvement to the above solution is that: the sides of the traveling wheels at the bottom of the frame and both sides of the discharge port of the sealed belt conveyor are provided with annular sealing plates; the upper half of the annular sealing plate is made of stainless steel and is connected to the frame, and the upper half is made of rubber and is connected to the upper half by bolts.

[0014] A further improvement to the above solution is that the sealed belt conveyor includes a sealing cover for the head and tail pulleys and an upper fully enclosed material guide chute, removable baffles on both sides of the belt conveyor, and a dust return receiving plate for the belt conveyor; the sealing cover for the head and tail pulleys is a fully enclosed structure, forming a sealed space at the head and tail of the belt conveyor, and a cleaner is installed at the head and tail pulleys respectively, and the material cleaned by the cleaner falls into the coal tower; the sealing cover for the head and tail pulleys and the upper fully enclosed material guide chute, together with the removable baffles on both sides of the belt conveyor and the dust return receiving plate for the belt conveyor, form a sealed space.

[0015] The further improvement of the above scheme is that the negative pressure adjustment coefficient η is taken as 1-2; the material line fluctuation adjustment coefficient β is taken as 5-10.

[0016] A further improvement to the above solution is that a manhole is provided in the closed cover plate.

[0017] The environmentally friendly sealed device for the coal tower feeding trolley provided by this invention achieves full enclosure during the circular feeding process of the feeding trolley, minimizing the leakage of coal dust; the fully sealed belt conveyor system reduces secondary dust generation due to backflow of material from the belt conveyor, ensuring the airtightness of the coal dust transportation process; under the fully sealed condition of the entire coal tower feeding trolley, the bag filter dust collection system adopts reasonable control to effectively handle the dust generated by the feeding process; the start-up and shutdown time and high / low speed time of the dust collector are dynamically set to improve the efficiency of the dust collection system; and the negative pressure within the dust collection sealing system is controlled according to the coal tower feeding amount and material line fluctuations. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the fabric trolley structure in the existing technology.

[0019] Figure 2 This is a schematic diagram of a preferred embodiment of the present invention.

[0020] Figure 3 yes Figure 2 A top-view structural diagram;

[0021] Figure 4 This is a structural schematic diagram of a sealed belt conveyor;

[0022] Figure 5 This is a schematic diagram of a bag filter dust collection system. Implementation

[0023] Example: The environmentally friendly sealed device for the coal tower feeding trolley in this example includes: an annular sealing assembly, a sealed belt conveyor, and a bag filter dust collection system.

[0024] like Figure 2 and Figure 3 As shown, the annular sealing assembly includes a sealing cover plate 7, a frame, traveling wheels 1, and a track; the frame supports the sealing cover plate 7; the sealing cover plate 7 and the frame are located at the upper opening of the coal tower, forming a sealed space at the upper opening of the coal tower; the traveling wheels 1 are installed at the bottom of the frame 2 and placed on the track, allowing them to move along the track. The sides of the traveling wheels at the bottom of the frame and both sides of the discharge port of the sealing conveyor have annular sealing plates 2; the upper half of the annular sealing plate is made of stainless steel and connected to the frame, while the lower half is made of rubber and connected to the upper half by bolts.

[0025] The sealed belt conveyor is located on the closed cover plate 7; both ends of the sealed belt conveyor are discharge ports; the discharge ports pass through the closed cover plate 7; the sealed belt conveyor can rotate around the center of the upper opening of the coal tower as an axis, and as the sealed belt conveyor rotates, the discharge ports at both ends move along circular trajectories with different radii; the top inlet of the sealed belt conveyor is connected to the upstream coal blending system belt conveyor; the size of the closed cover plate 7 is slightly larger than the size of the outer discharge port, so as to achieve better coverage. Accordingly, the closed cover plate 7 is circular, and for balance, four symmetrical traveling wheels are provided.

[0026] like Figure 5 As shown, the baghouse dust collection system includes a fan 6 and a baghouse dust collector 5. The system has five suction ports, with four suction ports 3 located at the four corners of the upper opening of the coal tower, and the remaining suction port 11 connected to the inlet of the sealed conveyor belt. Corresponding components are connected via pipes 4, and a chimney is installed at the exhaust point. The baghouse dust collector 5 has an ash discharge valve at its bottom, allowing the collected coal dust to fall directly into the coal tower's main storage compartment via the ash discharge system at the bottom of the dust collector. The fan 6 provides the power for dust collection, delivering the gas drawn in through the suction ports to the baghouse dust collector 5.

[0027] like Figure 4 As shown, the sealed belt conveyor includes a sealing cover for the head and tail pulleys and an upper fully enclosed material guide chute 9, removable baffles on both sides of the belt conveyor 8, and a dust collection plate 10. The sealing cover for the head and tail pulleys is a fully enclosed structure, forming a sealed space at the head and tail of the belt conveyor. Scrapers are installed at the head and tail pulleys respectively, and the material swept down by the scrapers falls into the coal tower. The sealing cover for the head and tail pulleys and the upper fully enclosed material guide chute, together with the removable baffles on both sides of the belt conveyor and the dust collection plate, form a sealed space to prevent coal dust generated during belt transport from spilling out. The removable baffles are also easy to disassemble, allowing operators and maintenance personnel to easily check the operation of the belt idlers and the belt. The upper surface of the dust collection plate is flat without ribs, facilitating regular cleaning of floating dust.

[0028] The baghouse dust collection system is linked to the fabric feeding system. When the fabric feeding machine starts working, the fan 6 of the baghouse dust collection system starts and maintains a minimum speed. There is no pulverized coal on the conveyor belt, so the fan 6 maintains a minimum speed and is ready for operation. Furthermore, at this time, a negative pressure P can be generated. L It can be used to handle loose materials in the equipment. When the material arrives at the material distribution trolley, the fan 6 increases its speed and starts working.

[0029] When the amount of fabric fluctuates, let the negative pressure generated by fan 6 be P. Then the formula between P, material flow rate M, and material level fluctuation value Δh per unit time is P = P L *(1+η*M / M H +β*Δh / H H ), where PL The negative pressure generated when fan 6 operates at its lowest speed; M H H represents the maximum material flow rate. H The maximum material level in the coal tower is η, the negative pressure adjustment coefficient is 1-2, and the material level fluctuation adjustment coefficient is 5-10. The speed of the dust removal fan is dynamically adjusted based on the material flow rate and the fluctuation value of the coal tower material level to maintain a highly efficient interval negative pressure dust removal environment within the entire sealing system. This ensures both safe operation and effective dust removal while saving energy. The negative pressure generated by the fan ranges from 0.1 to 0.5 kPa.

[0030] Under negative pressure, coal dust generated by the fabric conveyor enters the bag filter for filtration through four dust suction ports and pipes at the top of the coal tower, and is then discharged into the atmosphere via a fan and chimney. Dust within the enclosed space of the conveyor belt is also processed by the dust removal system under negative pressure at the suction port above the conveyor belt. The coal dust collected by the dust collector falls directly into the coal tower's main storage compartment through the ash conveying system at the bottom of the dust collector. The dust collector uses a combination of negative pressure suction from a fan and bag filtration to separate coal dust from air, avoiding the drawbacks of spray dust suppression technology, such as increased coal dust humidity, positive pressure generated inside the coal tower by the spray, and the inability to eliminate the impact positive pressure generated by the falling material from the annular fabric conveyor.

[0031] The baghouse dust collector control system uses a PLC for control, mainly controlling the remote start / stop and interlock functions of the dust collector fan, realizing the synchronous start / stop of the dust collector fan and the cloth feeding trolley, reducing system energy consumption; controlling the dust collector's back-blowing system, which maintains back-blowing when the cloth feeding trolley is not working, preventing the coal dust blown down from being sucked back into the dust collection system, and improving the efficiency of back-blowing; and controlling the operation of the dust collector's ash discharge system, with an ash discharge valve installed at the bottom of the dust collector to prevent back-suction from the ash discharge port, thus achieving the maximum efficiency of the dust collection system.

[0032] The enclosed cover 7 has a manhole; the interior can be inspected if necessary.

[0033] This invention is not limited to the embodiments described above. All technical solutions formed by equivalent substitutions fall within the scope of protection claimed by this invention.

Claims

1. An environmentally friendly sealed device for a coal tower feeding trolley, characterized in that, include: Annular sealing components, sealed belt conveyors, and baghouse dust collection systems; The annular sealing assembly includes a sealing cover, a frame, an annular baffle, wheels, and a track; the frame supports the sealing cover; the sealing cover and the frame are located at the upper opening of the coal tower and form a sealed space at the upper opening of the coal tower; the wheels are installed at the bottom of the frame and can move along the track, which is annular; The sealed belt conveyor is located on the closed cover plate; both ends of the sealed belt conveyor are discharge ports; the discharge ports pass through the closed cover plate; the sealed belt conveyor can rotate about the center of the upper opening of the coal tower as an axis, and as the sealed belt conveyor rotates, the discharge ports at both ends move along circular trajectories with different radii; the inlet of the sealed belt conveyor is connected to the upstream feeding equipment. The bag filter dust collection system includes a fan and a bag filter dust collector; the bag filter dust collection system has several dust collection ports, which are respectively arranged at the four corners of the upper opening of the coal tower and the inlet of the sealed belt conveyor; the fan provides dust collection power and sends the gas drawn in from the dust collection ports to the bag filter dust collector. When the material is laid, the fan of the bag dust collection system starts and maintains a minimum speed. When the material arrives at the material trolley, the fan speed increases. When the amount of fabric fluctuates, let the negative pressure generated by the fan be P. Then the formula between P, the material flow rate M, and the material level fluctuation value Δh per unit time is P = P L *(1+η*M / M H +β*Δh / H H ), where P L The negative pressure generated when the fan is at its lowest speed; M H H represents the maximum material flow rate. H η is the highest material level in the coal tower, η is the negative pressure adjustment coefficient, and β is the material level fluctuation adjustment coefficient.

2. The environmentally friendly sealed device for the coal tower feeding trolley according to claim 1, characterized in that: The bottom of the frame has annular sealing plates on the sides of the traveling wheels and on both sides of the discharge port of the sealed belt conveyor. The upper half of the annular sealing plate is made of stainless steel and is connected to the frame, while the lower half is made of rubber and is connected to the upper half by bolts.

3. The environmentally friendly sealed device for the coal tower feeding trolley according to claim 1, characterized in that: The sealed belt conveyor includes a sealing cover for the head and tail pulleys and an upper fully enclosed material guide chute, removable baffles on both sides of the belt conveyor, and a dust return receiving plate for the belt conveyor. The sealing cover for the head and tail pulleys is a fully enclosed structure, forming a sealed space at the head and tail of the belt conveyor. Scrapers are installed at the head and tail pulleys of the belt conveyor, and the material swept down by the scrapers falls into the coal tower. The sealing cover for the head and tail pulleys and the upper fully enclosed material guide chute, together with the removable baffles on both sides of the belt conveyor and the dust return receiving plate for the belt conveyor, form a sealed space.

4. The environmentally friendly sealed device for the coal tower feeding trolley according to claim 1, characterized in that: The negative pressure adjustment coefficient η is taken as 1-2; the material line fluctuation adjustment coefficient β is taken as 5-10.

5. The environmentally friendly sealed device for the coal tower feeding trolley according to claim 1, characterized in that: The enclosed cover plate has a manhole.

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